CN207586676U - The constant current plate of multiple-channel output - Google Patents
The constant current plate of multiple-channel output Download PDFInfo
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- CN207586676U CN207586676U CN201720850745.6U CN201720850745U CN207586676U CN 207586676 U CN207586676 U CN 207586676U CN 201720850745 U CN201720850745 U CN 201720850745U CN 207586676 U CN207586676 U CN 207586676U
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Abstract
The utility model discloses a kind of constant current plate of multiple-channel output, including：Multiple power supplies are installed, host computer communicates with micro-control unit, and the micro-control unit is connect with the multiple power supplies on circuit board；The micro-control unit has output current value end, protective current value end, constant pressure value end, and the multiple power supplies include：Power management chip output terminal is connect with liquid crystal display, and current acquisition chip samples the output terminal of the power management chip, and the current acquisition chip output connects comparator；Adder is connect with the current acquisition chip；The output current value end inputs the current control pin of the power management chip；The protective current value end connects the comparator；Trigger is connected between the Enable Pin of the output terminal of the comparator and the power management chip；The constant pressure value is terminated into the adder, and the output terminal of the adder connects the voltage control pin of the power management chip.Constant current or constant voltage mode may be used.
Description
Technical field
The utility model is related to a kind of constant current plate more particularly to a kind of constant current plates of multiple-channel output.
Background technology
Power supply is one of two element of LCD point diagrams, is powered wherein having to screen, is also to the backlight power supply of screen, backlight the inside
It is lamp string, has common-anode also to have common cathode, the mode of different screen drivings, size of current is also different, there is constant pressure driving,
Have constant current driving, once and overcurrent lamp string be easy to burn, the above problem brings complexity in the design of backlight electric power
Therefore, those skilled in the art be dedicated to developing a kind of multichannel it is adjustable and will not burn-in constant current plate.
Utility model content
In view of the drawbacks described above of the prior art, have the technical problem to be solved by the utility model is to provide one kind more
The constant current plate of road output, wherein, including：Multiple power supplies are installed on one circuit board, a host computer communicates with a micro-control unit,
The micro-control unit is connect with the multiple power supplies；The micro-control unit has an output current value end, protective current value
End, constant pressure value end, the multiple power supplies include：One power management chip output terminal is connect with a liquid crystal display, a current acquisition core
Piece samples the output terminal of the power management chip, and the current acquisition chip output connects a comparator；One adds
Musical instruments used in a Buddhist or Taoist mass is connect with the current acquisition chip；The current control that the output current value end inputs the power management chip is drawn
Foot；The protective current value end connects the comparator；The output terminal of the comparator is enabled with the power management chip
A trigger is connected between end；The constant pressure value is terminated into the adder, and the output terminal of the adder connects the electricity
The voltage control pin of source control chip；The input terminal is exported with the current acquisition chip output, the voltage sample
End connection.
Preferably, a sampling resistor is further included, the current acquisition chip is attempted by the sampling resistor.
Preferably, the adder includes：First resistor, the second resistance being serially connected on the current acquisition chip,
Described in second resistance ground connection；One end of one the 4th resistance is connected between the first resistor, the second resistance, and described
The other end of four resistance is connect with the anode of an amplifier, and one the 5th resistance is connected between the cathode and output terminal of the amplifier；
The input terminal of one voltage acquisition chip is connected between the first resistor, the second resistance；The constant pressure value end with it is described
A 3rd resistor is serially connected between the anode of operational amplifier.
Preferably, the power management chip input terminal connects an AC-DC power module.
Preferably, the multiple power supplies include：Three road constant-current sources, all the way constant pressure source.
The utility model offshore wind farm unit transmission system is efficiently solved and is powered in the prior art compared to the prior art
The problem of lamp string is easily burnt up after specification disunity, overcurrent by setting the adjustable constant-current source of multichannel and constant pressure source, is driven according to screen
The operating mode that flowing mode and size of current carry out power supply is constant current or constant voltage mode, and voltage and current precision is up to 1%, can be simultaneous
Hold the screen that market LCD needs multiple power supplies.
The technique effect of the design of the utility model, concrete structure and generation is made furtherly below with reference to attached drawing
It is bright, to be fully understood from the purpose of this utility model, feature and effect.
Description of the drawings
Fig. 1 is the circuit block diagram of the utility model.
Specific embodiment
As shown in the figure, Fig. 1 is the circuit block diagram of the utility model, a kind of constant current plate with multiple-channel output, wherein, packet
It includes：Multiple power supplies 1 are installed, a host computer communicates with a micro-control unit, micro-control unit and multiple power supplies 1 on one circuit board
Connection；Micro-control unit has an output current value end, protective current value end 22, constant pressure value end 23, and power supply 1 includes：One power supply
11 output terminal of managing chip is connect with a liquid crystal display 7, and a current acquisition chip 3 adopts the output terminal of power management chip 11
Sample, 3 output terminal of current acquisition chip connect a comparator 41；One adder is connect with current acquisition chip 3；Output current value
Hold the current control pin of 21 input power managing chips 11；Protective current value end 22 connects comparator 41；Comparator 41 it is defeated
A trigger 6 is connected between outlet and the Enable Pin of power management chip 11；Adder is accessed at constant pressure value end 23, adder
Output terminal connects the voltage control pin of power management chip 11.Input terminal and 3 output terminal of current acquisition chip, voltage sample are defeated
Outlet connects.
Preferably, a sampling resistor 31 is further included, current acquisition chip 3 is attempted by sampling resistor 31.
Preferably, adder includes：First resistor 51, the second resistance 52 being serially connected on current acquisition chip 3, the second electricity
52 ground connection of resistance；One end of one the 4th resistance 54 is connected between first resistor 51, second resistance 52, the other end of the 4th resistance 54
It is connect with the anode of an amplifier, one the 5th resistance 55 is connected between the cathode and output terminal of amplifier；One voltage acquisition chip
Input terminal is connected between first resistor 51, second resistance 52；It is concatenated between constant pressure value end 23 and the anode of operational amplifier 42
There is a 3rd resistor 53.
Preferably, 11 input terminal of power management chip connection, one AC-DC power supplys, 1 module.
Preferably, micro-control unit input port is connect with 3 output terminal of current acquisition chip, voltage sample output terminal.
Preferably, multiple power supplies 1 include：Three road constant-current sources, all the way constant pressure source.
In the specific implementation process of the utility model, the utility model can work in both modes：Constant current mode,
Constant voltage mode, specifically：
Constant current mode.By taking the first via as an example, other three tunnels principles are the same.The size of 1 output current of power supply and electric current control
The voltage of pin processed is related, and compliance voltage is related with load, once output voltage then enters to the constant pressure value of setting
Constant voltage mode.This constant pressure value is adjustable by adder realization one.User is by host computer to micro-control unit controls, setting
Output current value, protective current value, constant pressure value are sent respectively to the current control foot of power management chip 11, and comparator 41 is reversely
Input terminal, adder input terminal.One constant electric current of output arrives screen, collected electric current one again by current sampling resistor 31
End is sent to the modulus conversion chip of main control chip, is adjusted by software PID so that the precision of output current is raised；The other end is sent
To the noninverting input of comparator 41, made a decision with the current upper limit value of user setting, once more than protecting, the output of comparator 41 one
A high level gives trigger 6 input terminal, and trigger 6 drags down the enabled of power supply 1, closes output, protection load.
Output current value, protective current value, the set-up mode of constant pressure value are the MCU by micro-control unit and the plate
STM32F103 writes value by SPI communication modes by CAN communication, then muc to digital-to-analogue conversion internal register, makes mould
Number converter exports corresponding analog voltage, and the control which is transmitted to the output current of power management chip 11 is drawn
Foot, the input terminal of comparator 41 export corresponding current value.These values are determined according to LCD module group backlights, (comprising lamp string
Connection mode, depending on the parameter of quantity lamp) generally determined according to the handbook of LCD modules.Protective current value include upper current limit and
Lower limit.
Constant voltage mode, output voltage is more than setting constant pressure value under constant current mode, then into constant voltage mode.It only need to be by electric current
The voltage setting of controlling switch is maximum, and output constant current value is also just maximum, and in the case where loading very little, output easily enters perseverance
Pressure value, output voltage also have acquisition, main purpose two, and a display second is that doing PID adjustings in software, makes constant pressure value defeated
The precision gone out is raised.
Claims (5)
1. a kind of constant current plate with multiple-channel output, which is characterized in that including：Multiple power supplies are installed, on one on one circuit board
Position machine communicates with a micro-control unit, and the micro-control unit is connect with the multiple power supplies；The micro-control unit has defeated
Enter end, output current value end, protective current value end, constant pressure value end, the multiple power supplies include：One power management chip output terminal
It is connect with a liquid crystal display, a current acquisition chip samples the output terminal of the power management chip, the current acquisition
Chip output connects a comparator；One adder is connect with the current acquisition chip；The output current value end inputs institute
State the current control pin of power management chip；The protective current value end connects the comparator；The output of the comparator
A trigger is connected between end and the Enable Pin of the power management chip；The constant pressure value is terminated into the adder, institute
The output terminal for stating adder connects the voltage control pin of the power management chip；The input terminal and the current acquisition core
Piece output terminal, voltage sample output terminal connection.
2. there is the constant current plate of multiple-channel output as described in claim 1, which is characterized in that a sampling resistor is further included, it is described
Current acquisition chip is attempted by the sampling resistor.
3. there is the constant current plate of multiple-channel output as described in claim 1, which is characterized in that the adder includes：It is serially connected in
First resistor, second resistance on the current acquisition chip, wherein the second resistance is grounded；One end of one the 4th resistance connects
It is connected between the first resistor, the second resistance, the other end of the 4th resistance is connect with the anode of an amplifier, described
One the 5th resistance is connected between the cathode and output terminal of amplifier；The input terminal of one voltage acquisition chip is connected to first electricity
Between resistance, the second resistance；A 3rd resistor is serially connected between the constant pressure value end and the anode of an operational amplifier.
4. there is the constant current plate of multiple-channel output as described in claim 1, which is characterized in that the power management chip input terminal
Connect an AC-DC power module.
5. there is the constant current plate of multiple-channel output as described in claim 1, which is characterized in that the multiple power supplies include：Three tunnels
Constant-current source, all the way constant pressure source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720850745.6U CN207586676U (en) | 2017-07-13 | 2017-07-13 | The constant current plate of multiple-channel output |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720850745.6U CN207586676U (en) | 2017-07-13 | 2017-07-13 | The constant current plate of multiple-channel output |
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| Publication Number | Publication Date |
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| CN207586676U true CN207586676U (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720850745.6U Active CN207586676U (en) | 2017-07-13 | 2017-07-13 | The constant current plate of multiple-channel output |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597326A (en) * | 2018-11-16 | 2019-04-09 | 深圳和而泰智能控制股份有限公司 | Control circuit and dust catcher |
| CN112731834A (en) * | 2020-12-22 | 2021-04-30 | 重庆德科电子仪表有限公司 | System and method for low-power-consumption driving of indicator lamp of full-segment code instrument |
-
2017
- 2017-07-13 CN CN201720850745.6U patent/CN207586676U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597326A (en) * | 2018-11-16 | 2019-04-09 | 深圳和而泰智能控制股份有限公司 | Control circuit and dust catcher |
| CN109597326B (en) * | 2018-11-16 | 2024-02-13 | 深圳和而泰智能控制股份有限公司 | Control circuit and dust collector |
| CN112731834A (en) * | 2020-12-22 | 2021-04-30 | 重庆德科电子仪表有限公司 | System and method for low-power-consumption driving of indicator lamp of full-segment code instrument |
| CN112731834B (en) * | 2020-12-22 | 2022-07-01 | 重庆德科电子仪表有限公司 | System and method for low-power-consumption driving of indicator lamp of full-segment code instrument |
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