So, here we will talk about one of the most difficult moments - the power supply of universal controllers from the "native" power supplies of future designs. One clarification is about the power of universal television controllers, since things are much easier with monitor controllers. But even if it becomes necessary to resolve the issue of nutrition and those, then after reading this material, I think everything will be clear and all questions will disappear. Let's try to cover all occasions.
Before proceeding to specific examples, it is necessary to understand how the internal supply circuits of the controller are arranged and it will depend on whether this is a simple task or very heavy.
Here is a block diagram of the power supply circuits of any of the V29-V59 universal TV controllers:
As you can see, there are two voltage converters in the controller - the first on the DC-DC buck converter (+ 12 / + 5) and the second on the linear regulator (+ 5 / + 3.3). I have a DC-DC converter ZTP7193i on the V59 board. The linear stabilizer chip is some kind of noname, but initially - itвЂ™s still a brainchild of Linear Technology LT1084 (if you are interested, you can search for the datasheet just for it). Here is where these nodes are located on the board (example on V59, but also on V29, V56 is about the same):
The power supply circuits of the z.vst3463 controller are slightly different and look like this:
and here is where these nodes are on the board itself:
In this controller, the power supply of 3.3V is somewhat different: instead of one powerful linear LT1084 stabilizer, the low-power AMS1117 is used to power the controller chip, and the power supply of 3.3V to the matrix is вЂ‹вЂ‹removed from the 5-volt source and reduced due to the voltage drop on the transitions of two diodes in direct power on. Also introduced node power off controller nodes + 5V. For example, now the USB connector, power amplifier and backlight control circuits in sleep mode are de-energized.ATTENTION!!! Before you run your design on this controller, I STRONGLY recommend that you look under the spoiler of "good advice" and carefully read the power-up item highlighted in red.
The same applies to the designs on the 3663 controller.
As can be seen from the diagrams, the controllers can be safely powered not only from + 12V, but also from + 5V. Of course, provided that we do not need + 12V (for example, to power the matrix and (or) the backlight inverter). But even if it is needed, both of these power supplies can be spread and below I will give an example of how.
There is an opinion that it is possible to apply + 5V to the + 12V connector and not to think much. Before doing this, I would advise to think, nevertheless, and here's why. I quote the DC-DC converter circuit (a piece of datasheet and do not pay attention to the indicated voltages):
Arrows, I showed the passage of current through the chip. It is the passage, not the conversion (which is generally the main task of this chip). But the internal circuit of this chip:
So this is how the internal key works when the microchip is not in the mode - this is the question. In a word, whoever decides on this is only at your own peril and risk. I am personally not sure about the long-term use of the chip in this state. But even when she takes off, it's okay too - you can drop it off and serve + 5V directly - you can decide that already.
Another, in my opinion, very important point: the power supply must be obviously serviceable. I think comments are unnecessary here, since it is not difficult to guess what the launch of a controller with a faulty power supply will result in. It can be checked offline (of course with the backlight connected). To do this, you need several automotive light bulbs that are not powerful, for example, from dimensions, and then you need to connect loads and simulate switching. How? Read below - and it will become clear. Well, for examplethis
topic to help.
I think, before moving on to the realization of connection diagrams, one should rather chew one rather important point: the difference between the power supplies of monitors and TVs.
In the overwhelming majority of monitors, the power supply when the cord is turned on to the network is always in active mode. Those. "Sleep" monitor mode only applies to the controller and backlight, but not to the power supply - it is always in operation. The "Awakening" signal in the monitors only serves to turn on the backlight - i.e. Only one bus (BLON, BKLT, INV_ON, BKLT_EN, BL_EN and similar abbreviations), which runs the inverter (driver) of the backlight. Summarizing said: The monitor power supply is always in operating condition, and the on / off of the monitor is the result of manifesting the status of the backlight circuit (it works accordingly / does not work) and this scheme is only controlled by one bus. The exceptions make up large monitors with CCFL backlight - they are more like a television BP.
BP TVs differ significantly from the BP monitors. The fact is that in relation to monitors, the difference in power consumption between the duty regime and the working is small - for example, 3W and 40W, respectively. Those. The 40-watt BP in the duty state is calmly working at idle and it does not go beyond its normal functioning. In the TVs (for example with a lamp backlight), consumption in the standby mode is also 3-5W, and in the working - up to 180W (42 inches). It is clear that to make such a powerful idle source work is technically difficult - it simply will not give out normal stresses and currents for the duty regime. In such BP, a separate low-power power supply is installed for the duty mode (its output is called on boards as VSTB, VSB), and the main (powerful) power supply is switched on in a separate bus. On BP boards, this tire is denoted as on_off (sometimes n_f), S / B and something like that. I repeat - only a powerful power source is activated by this signal, from which the backlight inverter is powered, the power supply chain of the matrix, the power amplifier, etc. In this case, this signal is not responsible for turning on the backlight. It is completely another signal for its inclusion. It is indicated in the same way as I called the paragraph above. What is it done for what. If you look at the time diagram, the backlight turns on after all the transactions associated with the supply of power to all TV nodes will be held. Thus, contemplation is excluded on the screen of these most processes. So, we summarize according to the one: the television BP is "on duty" by one source, and the TV is provided to others. It turns on in contrast to the monitor's BP with two control signals - one includes a powerful power supply, the second - backlight. I hope explained it is intelligible.
We now turn directly to the discussion of wiring diagrams.
1. CONNECTION TO BP MONITORS
Excuse my friends, but without theory in any way. Otherwise, everything will turn into a stupid copying schemes and then unnecessary questions. So try to learn what I'm trying to convey.
To begin with, the familiar scheme from the first spoiler, but with minor amendments, what we should have in the end:
The question may arise: why do you need to do this? The fact is that if a monitor is subject to alteration, it is not difficult to guess that its native power supply is already designed for the operation of its matrix and for ensuring the work of its illumination. There is nothing to be wise with external adapters, there is no need to re-buy individual inverters, and you donвЂ™t even need to redo the monitor's design - everything is ready only to replace one controller with another, that's all.
The power supply components are usually built ("built", if it comes to monitors with CCFL illumination) according to the source scheme for two voltages - + 5V and also "some". Why "What"? Yes, because it can be from 13 to 22V - it all depends on what kind of supply voltage is designed on the same card inverter of the lighting of lamps or LEDs. In addition, it is not a fact that this is the second voltage enters the controller - most often there is nothing to do there. The controller is usually powered by + 5V, and the matrix - or from + 5V or from + 3.3V. In the latter case, the stabilizer + 3.3V may be either on the controller board or on the BP board, but it does not change the essence - the primary for it is all the same + 5V. But it's not the main thing. The source + 5V is pre-first, i.e. It can issue a current up to 2.5-3A, and secondly, it is the only power supply on which feedback is carried out to stabilize the voltage. And if it remains unloaded, the probability of issuing unstable voltage on the power supply of the inverter is large. Those. Without a load on a 5-volt source, the voltage at the output of the second source at the specified value of 13V (for example) can vary from 13 to 19V. In addition, the backlight power supply is calculated for maximum current 1-1,5A. And if so, then 1-1,2A "eats" the inverter and the power of the controller (if the controller is powered from it) will remain anything. As a result, we simply get a "squid" in the form of triggering protection of PBC from overload. To this not happen, you need to power the controller from the source + 5V. How can I do that? Very simple -apply + 5V from the power supply to the pin of the 5V matrix power selector jumper, which sits on the + 5V bus.
What do I mean by this phrase: if the matrix is вЂ‹вЂ‹powered by 3.3V, then it will be pumped straight to the pin or an electrolytic condenser in the output of the built-in DC-DC converter, and if the 5-volt matrix (and this pin will simply be Busy jumper) - then only to the condenser. Or see where the tire is in the controller + 5V and select a convenient place where you can fall to it. For V29-V59 controllers, this is a stabilizer 1084, an amplifier power resistor, etc. This tire is easy enough to bring up the location of the legs of the stabilizer 1084 (the picture for V59 !!! for others - you have to search):
For the Z.VST3463 board, the + 5V bus can be found according to the above mentioned section of the board - this is the throttle pad (where the + 5V bus arrow is stuck).
However, in this connection there is one caveat: we feed + 5V to pin 3 (via a throttle, see the diagram above) of a completely unpowered DC-DC converter chip. Judging by the above internal scheme, nothing terrible should happen. But I still strongly recommend the throttle at the output of the built-in converter to unsolder away from sin. And this is about the V29-V59. But in relation to 3463 or 3663, it is probably necessary to unsolder it. There are cases of "loss" of controllers among forumtsev ...
I think no one will have problems with this connection, because the + 12V source in the designers of the monitors is not needed in any part of the circuit.
Sometimes, it is very rare monitors with a single source. For example, Samsung Syncmaster 225 - he has only one source and he is + 13V. Then of course without options - connect directly to the + 12V connector of the controller. The converter withstands input voltage up to 20V.
And, of course, one cannot say that all of the above applies to absolutely all monitors - of course, there are also non-standard solutions in the circuitry of monitors. In this case, you will need to understand in more detail.
As for the control signals in the power supply unit of the monitors, there are usually only two of them - turning on the backlight and controlling the brightness. Below I will summarize this information in a separate paragraph.ATTENTION!!! All of the above relates to the fact that I was holding. Those. to the boards, where the feeding portion is expressed as clearly shown in the above schemes.
This V29-V59, zvst3463, D3663. As for more recent versions of controllers, it is necessary to carefully examine their scheme for such a possibility. For example, I can say with confidence that the controller Qt526 thus only powered from + 5V will not succeed because the supply chain made it quite differently. Here
It is an example of how this has been energized by the controller monitor PSU, on which there are two supply voltage + 12V and + 5V. Moreover, high-current + 5V and + 12V - low current and the entire controller to run from one + 12V could not be articulated by me above reason. Other controllers, deserve attention, I did not - so I can not speak for all manufactured in China glands indiscriminately.
I must say that use native PSU of reworks display certainly much preferable to seek some kind of external adapter. But it is not always easy to do so. Who has the desire - it is the theme, go to the questions will be solved.
2. CONNECTION TO PSU TVS
Why PSU? Because, in addition to the power supply, there can be quite a lot of other nodes on the board, so the TV power units are called the Power Supply Unit. I must say that the second board (often called the Main Board) is correctly called SSB - the Small Signal Board, and this has a definite meaning. The lion's share of the electricity eaten comes from the backlight, and everything else is trifle, and relying on some significant energy consumption by the controller is not worth it ...
Again the theory - without it, alas, no way ...
It is rather difficult to cover all the constructions of television units, therefore I will give the most common ones. Structural Schemes Again. IвЂ™ll just make a reservation that I selected the most significant nodes and if anyone decides to let me know that I forgot to draw the circuits of rectifiers and the correctors of the power factor - believe me, I remember that very well. Just the vast majority will not need it.
Well, at the very beginning I will make a note about their difference from the power supply of the monitors: on TVs (diagonals over 24 ") the power supply has a real standby mode. That is," something "in them in sleep mode" sleeps "and only works active mode. What "sleeps" and how - read below.
but). PSU TV on CCFL lamps
As can be seen from the figure, these are the power units that are used in the TVs with a lamp light, the inverter of which is present as a separate board attached on the back of the matrix. A distinctive feature of them is a rather powerful transformer from which the inverter power supply voltages (+ 24V) are removed, in the overwhelming majority of 12V (to power almost all SSB nodes and in the presence of such a power of the logical part of the matrix). It is possible on it more sources for powering sound amplifiers. They are just not interesting to us and I intentionally did not even draw them, because they can not load them in work and it will not affect anything. The duty mode is implemented as a separate low-power source, which always works if the cord is inserted into the outlet. VSTB voltage I intentionally did not indicate because it can meet with a dimension of 3.3V, 3.5V, 4.7V, 5V and it seems even 6B (perhaps in the last I am mistaken, but it could be in very old models). The main power supply (+24, + 12V) works only in active mode, i.e. There are no these stresses in the television mode.
The aforementioned illumination inverter (so-called. Stadalone, the one that hangs on the back of the matrix) has another one, in my opinion a wonderful feature. Almost all 100% of such inverters feed on 24V voltage (in connection with which if the matrices are similar in size, they are interchangeable, I'm talking about the inverter with other characteristics), but this is not the main thing - almost all such inverters have two brightness adjustment entries - PWM (PDIM) and analog (ADIM), which switches between these Special Pin modes. As a rule, ADIM is not connected, but it can always be activated by rearning the wire in the inverter connector and taking measures to switch the inverter to the ADIM mode (in this case it turns on its built-in PWM, which is controlled by the adjustment voltage). So this inverter is easiest to be adapted to adjust the brightness from the universal controller.
b). PSU TV on EEFL lamps
In principle, the differences from the previous PSU there are significant, although this does not affect the project on the basis of a universal controller. The main difference is the matrix there is no separate inverter and it is on the PSU board. Why is that? Because EEFL lamps (External Electrode Fluorescent Lamp) have such a design that they can be connected in parallel and the entire node of the lamp lighting is removed from the matrix with two wires. Accordingly, there is no need in a multi-edged inverter (as in the case of CCFL lamps). All other nuances mentioned above for the previous PSU are fair and for this PSU.
c) .PSU TV with LED backlight
If in the two previous cases, the circuit solutions of the vast majority of TVs did not differ much, then in the case of LED backlighting, PSU circuitry often harbors unexpected surprises in the form of non-standard circuit solutions of developers of a particular brand. Therefore, I present a picture of a strongly averaged average PSU for LED backlighting. Further it will be clear (I hope) that the main thing is not the circuitry, but all the same backlight control signals and supply voltages.
I think that there is nothing special to comment on - almost everything that was said above.
For what I gave these three schemes. To make it clear how the backlight is controlled and how the power circuits are organized, which we will need later to connect our controller.
And there is nothing more to say ... Anyone who has carefully studied everything that was above under this spoiler can figure out how to connect what and where. But in one, I think, I have to help - to unite everything into one вЂњuniversalвЂќ scheme and it looks like this:
Here I have implemented the most successful solution for powering the universal controller, which can also be called universal for almost all PSUs. On the left of the diagram, there is a plot of any television PSU, on the right - a controller (the diagram that was above). Now I explain what elements are installed and why, and how everything works.
So, the key point is washing the controller from the PSU duty voltage. This scheme is suitable for cases when the supply voltage of the duty regime is 5V and it was stated as mentioned above in the paragraph of power from the monitor BP (but only in contrast to the example through a diode). How it works. + 5V pass through the diode and it falls about 0.3-0.5V (it is better to apply with a smaller drop of 1N5817). Thus, on the 5-volt bus of the controller approximately 4.5-4.7V. This voltage is quite enough for the linear stabilizer to give out confident + 3. prov in its output to power the controller chip. The fact is that the voltage supplied to his input should be higher than 3.3V at least 1.1V (i.e. not less than 4.4V). In standby mode, the controller consumes no more than 100mA and this is the load of the PSU power supply unit. When we are "awakening" the controller, it gives the command to output ON / OFF the "Invertor" connector for switching on (...). I did not say to turn on what exactly. And all because if you carefully look at the PSU diagrams of the diagrams, you will notice that they have separate pins to start the main BP and to start the backlight. In our case, we simply connect them together and the controller will successfully launch both.
So, the controller submitted a signal to turn on the backlight and the main BP. At the same time, with the main BP, the + 12V voltage appears, which is connected to a complete power connector of the controller. Next, it is converted to + 5V and it in turn is applied to the diode cathode. In the "right" power blocks when submitting the POWER ON resolution voltage, the voltage at the outlet of the duty unit is slightly reduced (so conceived in the diagram), the voltage on the anode becomes below 5V and the diode is closed, the duty from duty BP is turned off and the controller continues to be powered by + 12V, Going with PSU. It must be said that not all duty duty blocks are absolutely "honest." It is likely that the scheme does not provide a decrease in the voltage of the duty unit in the active mode of the main one. There is no problem even if the diode is not closed, it will not arise. At least the controller will definitely be securely driven from the built-in DC / DC converter, and the BP on duty does not threaten this situation. When switching the controller in the waiting mode, everything occurs in the reverse order. This method is no longer the theory, but a proven and 100% workable (I applied it in my last project, you can find under the spoiler of finished designs).
For cases when the voltage of the on-demand power supply unit PSU is less than + 5V (meaning +3.3, + 3.5V), it will be necessary to apply a circuit withboosting
DC-DC boost converter. Converter
not at all scarce and completely capricious and stable. Then the connection scheme will look like this:
This scheme allows you to connect the controller to the "standby" voltage of any size from 3 to 6 volts. At the heart of the same theory with the diode, of which I spoke above - it will close when it appears from PSU + 12V and the boost converter remains unloaded - it is not scary for it. The magnitude of the voltage converter installed at the output (+ 10V) was chosen for reasons of a diode drop and a sure 12/5 V DC-DC converter on the controller board. It is not critical and can be from 8.5 to 11V.
Since the connection by the second scheme does not require interference with the diagram of the controller itself, then this option can be recommended to those who are afraid to climb the controller card with a soldering iron and in general to spoil the freight type of controller. Just the second scheme pulls the mandatory acquisition of the converter. By the way, it is not necessary to buy it in China at all - they are and we have the cost of it about 150 rubles (more expensive than in China, but not wait a month ...) ... ATTENTION !!! Configure the voltage of the boost converter to avoid troubles better in advance. This can be done even without load. And then connect to the circuit.
It should be noted that there are additional resistors on these two circuits. Their purpose will be described below in the paragraph about adjustments. However, this scheme applies only to controllers on the V29-V56. For the Z.VST3463 controller, both circuits need to be slightly changed, and the location for connecting additional resistors will look like this:
Those. There will be only one resistor and is connected between On / Off and Adjust. Why it is this way - you can also read about it in the same place in the paragraph about adjustments. For the DS3663 controller resistors are not needed at all.
And one moment. As it is not difficult to notice, all three different PSU variants mentioned above contain the duty pressure supply unit (for example, 5VSB). What it is: This is a low-power voltage source to maintain SSB nodes in sleep mode. Of course, the television circuitry varies greatly and the BP of the duty mode can be used for the washing of low-power nodes (for example, the controller Du and Supervisor), and can be powered by the entire logical part of the SSB and in sleep and in active mode - then it is designed to load up to 2-2, 5a. So in order not to guess and not guess which one you have in stock STANDBY, and the above-mentioned laying schemes of universal controllers have been developed. We are talking about diodes in the supply chains and parallel use of the source + 12V, which accurately has sufficient power.
However, it is worth noting another fact - not all 100% of television PSUs can be combed with the same brush - there are also вЂњambushesвЂќ.
1. It so happens that sometimes on TVs a small diagonal of the + 12V source may not be at all and the whole SSB is powered by voltage, for example + 5V. Powering the controller in this case will need to be done on the principle of powering the monitor PSU. How - I hope you figure it out, all the schemes are above.
2. Sometimes there are schemes in which the on-duty power supply unit has a very small capacity - i.e. sometimes it does not even pull the operating mode of the bare controller. There is a way out in this situation. for examplehere
detailed solution, which was successfully implemented by the questioning forum participant.
3. Another option: in the TV's power supply unit there is also a voltage of + 12V (which the controller does not pull) and a working + 12V (from the output of a powerful power supply unit, which comes to life only in the active mode). Then the power supply method is described.here
The main thing - to decide on the principle. And in particular - do not hesitate to ask questions in the topic. We will understand and make the best decision.
And more ... I practically anywhere did not show wires of "weight" on schemes. This does not mean that they do not exist. They are and their full! They are everywhere. Do not save them.
3. ABOUT POWER SUPPLY OF CONSTRUCTIONS PRODUCED "FROM ZERO".
What is meant: you have a matrix, there is a controller and there is an inverter as separate blocks. In this case, the easiest way is to purchase a 12V power adapter with a power of 40-60W (current 3.5-5A) and launch it. However, 12-volt power supplies are not as widely distributed as, for example, laptop adapters. There is a solution in this case. It is enough to apply a buck-to-dc buck converter (such assuch a
). It is put on the power of the controller itself and the voltage of 12V (i.e. it transforms 19 in 12V), and the backlight inverter is just better to put from 19V (of course if it allows it). In this case, it will heat up less than from 12V. Putting the controller itself from 19V I would not advise. Well, if the board uses a reduction converter chip with a permissible voltage of 20-24V. But it all depends on the manufacturer of the controller - it can set another microcircuit with a permissible supply voltage, for example, 18V and then from the ones attached 19V immediately "PCHIKNET" (and do not give God with consequences). In the area of вЂ‹вЂ‹100 pages of the topic, there is a confirmation of this - in the controller, accidentally connected from 20-22V, the DC-DC chip 12-5V flew and dragged another and important DC-DC to 1.2V, which feeds the controller chip.
By the way, those who know how to hold a soldering iron in their hands can safely use an unnecessary power supply from a computer - it will easily be able to issue 12V 5A, and perhaps the fan will not be needed. It can even be launched on the principle of television PSU (after all, in many of them there is also a separate 5-watt power supply system).
You can also buy not necessarily an adapter (in the classical sense, such as in a black plastic case), but an open power supply. I gave a link to a very good BPby this
Everything said in the last paragraph, of course, is focused mainly on designs with monitor or notebook matrices. Because it is necessary to invent a вЂњbicycleвЂќ on large television matrices with greater care and miscalculation of power.
And of course, the eternal question of almost everyone who decided on the project. Let's even highlight in bold:POWER SUPPLY SELECTION
In fact, the question is quite simple. I bring him here only for the reason that not everyone here has gathered with radio engineering education or with amateur radio experience.
Sorry, guys, but again the truisms - without them in any way. For those who absolutely no boom boom with electronics, I will explain on fingers.
1. If the power supply unit is written 12V 5A, then it literally means the following: the power supply module outputs a voltage of 12V to the output and at the same time it CAN eject current up to 5A. Does not issue, namelycan
give out !!! Those. the controller can be powered from a power supply designed for at least 1000 amperes, but if the controller eats only 1A, then this 1000 A power supply unit will give only 1A to the controller. Who does not understand - re-read again and again until you understand.
2. The values вЂ‹вЂ‹of voltage and current indicated on the power supply determine itsmaximum
power. The power (in watts) at the output of the power supply is equal to the voltage (in volts) to the current (in amperes). Since, as mentioned above, the value of the current current depends on the consumption of its load (and on the power blocks, the maximum current value is specified, which can "give" this power supply), then, accordingly, the power calculated by the above method is also the maximum possible value. Those. The 12V 5A power supply can be in the load 60W, but if you connect a controller that consumes only 1a, the power given to the power supply will be equal to 12W.
And now to the choice of power supply unit. To unequivocally answer this question, you need to be patient and find the strength to read the datasheet on your matrix. So, what serves as a calculation data:
a) Power consumption of the logical part of the matrix. In the datasheet, this (VDD Power) is in the Electrical characteristics section. There may be several values вЂ‹вЂ‹(for different backgrounds of the image) - choose the maximum.
b) The power consumption of the backlight. The same section and sub item Backlight Unit. It is called Power consumtion. We look at the value and multiply by 1.1 for LED backlighting or 1.3 for CCFL. The fact is that this power characterizes the net consumption of the backlight, but we need to lay stock on the efficiency of the inverter.
c) Power consumption of the controller itself in the active mode. Accurate data is not available, but the orientation is approximately 5-6W for the V29-V59 and 8-9W for the Z.VST3463.
We summarize the obtained power values вЂ‹вЂ‹and divide by .... If the planned power supply unit is 12V, it means by 12. If the power supply unit from the laptop is 18.5 (here I have laid the efficiency of the DC / DC down-converter, without which the controller cannot be connected). We get the amount of current in amperes.
It so happens that the data are obtained completely "in the grinding". Then you can either rely on the spare durability of the power supply unit, or after starting the whole structure, reduce the backlight brightness in the service menu (so that it does not work at full capacity). That's all science.