CN211788105U - Multi-path positive and negative voltage output circuit adopting one switching power supply chip - Google Patents
Multi-path positive and negative voltage output circuit adopting one switching power supply chip Download PDFInfo
- Publication number
- CN211788105U CN211788105U CN202020450526.0U CN202020450526U CN211788105U CN 211788105 U CN211788105 U CN 211788105U CN 202020450526 U CN202020450526 U CN 202020450526U CN 211788105 U CN211788105 U CN 211788105U
- Authority
- CN
- China
- Prior art keywords
- circuit
- negative voltage
- positive
- power supply
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to the technical field of positive and negative voltage output, in particular to a multi-path positive and negative voltage output circuit adopting a switching power supply chip, which comprises a display screen connected with the positive and negative voltage output circuit; the power supply also comprises a switching power supply chip, a positive voltage booster circuit, a negative voltage booster circuit, a positive voltage stabilizing circuit and a negative voltage stabilizing circuit; a first output end and a second output end on the switching power supply chip respectively output a first output value and a second output value; the first output end also outputs a third output value after passing through the positive voltage booster circuit and the positive voltage stabilizing circuit; the second output end also outputs a fourth output value after passing through the negative voltage booster circuit and the negative voltage stabilizing circuit. The utility model discloses a need two switching power supply chips to provide the required four ways driving voltage of display screen respectively among the current display screen drive circuit of solution usually, nevertheless adopt this mode can lead to manufacturing cost higher, and part quantity is more on the PCB board, the big problem of the PCB overall arrangement degree of difficulty.
Description
Technical Field
The utility model relates to a positive negative voltage output technical field, in particular to adopt positive negative voltage output circuit of multichannel of a switching power supply chip.
Background
The magnitude of the voltage is relative to a selected reference, and the voltage value is negative when the actual voltage is lower than the comparison voltage; in addition, when the selected voltage reference direction and the current reference direction are opposite, the reference voltage is the opposite of the actual voltage. Every point on the object will correspond to a potential, indicating its ability to drive a load. The voltage is the difference of the electric potential between two points, that is, there is a problem of reference points, the reference points are different, the voltage is different, and the negative voltage is selected to be higher than the electric potential of itself.
At present, the automobile industry develops towards the direction of intellectualization, particularly the functions of the vehicle-mounted display screen are more and more intelligent, the size of the screen is also more and more large, and the vehicle-mounted display screen needs bias voltages for driving, wherein the drive voltages comprise VGH, VGL, AVDDP and AVDDM. With the increasing size of the display screen, the driving capability requirements of the display screen on the bias voltages are higher and higher.
The current design scheme of the bias voltage of the display screen is as follows: two switching power supply chips are used, wherein one switching power supply generates VGH and VGL voltage. The other switching power supply generates AVDDP and AVDDM voltages. For example, TPS65150 using TI produces VGH, VGL voltages, and TPS65131 using TI additionally produces AVDDP, AVDDM voltages.
The existing display screen driving circuit needs to adopt two switching power supply chips, so that the circuit cost is increased, the number of electronic devices on a PCB is increased, and the layout difficulty of the PCB is further improved.
SUMMERY OF THE UTILITY MODEL
The invention provides a multi-path positive and negative voltage output circuit using one switching power supply chip, which is mainly used for solving the problems that two switching power supply chips are usually needed to provide four driving voltages required by a display screen in the existing display screen driving circuit, but the adoption of the mode can result in higher production cost, more parts on a PCB and large difficulty in PCB layout.
The utility model provides a multi-path positive and negative voltage output circuit adopting a switching power supply chip, which comprises a display screen connected with the positive and negative voltage output circuit; the power supply also comprises a switching power supply chip, a positive voltage booster circuit, a negative voltage booster circuit, a positive voltage stabilizing circuit and a negative voltage stabilizing circuit; a first output end and a second output end on the switching power supply chip respectively output a first output value and a second output value; the first output end also outputs a third output value after passing through the positive voltage booster circuit and the positive voltage stabilizing circuit; the second output end also outputs a fourth output value after passing through the negative voltage booster circuit and the negative voltage stabilizing circuit; the first output value and the second output value are positive and negative voltages; the first output value, the second output value, the third output value and the fourth output value are respectively connected with the display screen and used for driving the display screen.
Preferably, the positive voltage boost circuit and the negative voltage boost circuit are both capacitor diode boost circuits.
Preferably, the positive voltage boost circuit is a quadruple boost circuit, and the negative voltage boost circuit is a triple boost circuit.
Preferably, the positive voltage boost circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a zener diode D1, a zener diode D2, a zener diode D3, a zener diode D4, a zener diode D5, and a zener diode D6; one end of each of the capacitor C1, the capacitor C2 and the capacitor C3 is connected in parallel to a switch control pin of the switching power supply chip, and the other end of each of the capacitor C1, the capacitor C2 and the capacitor C3 is connected with the anodes of the voltage stabilizing diode D1, the voltage stabilizing diode D2 and the voltage stabilizing diode D3 respectively; the anode and the cathode of the zener diode D4 are respectively connected with the first output end and the anode of the zener diode D1; the anode and the cathode of the zener diode D5 are respectively connected with the cathode of the zener diode D1 and the anode of the zener diode D2; the anode and the cathode of the zener diode D6 are respectively connected with the cathode of the zener diode D2 and the anode of the zener diode D3; the negative electrode of the voltage stabilizing diode D3 is connected to the positive voltage stabilizing circuit.
Preferably, the negative voltage boost circuit comprises a capacitor C4 and a capacitor C5, and further comprises a zener diode D7, a zener diode D8, a zener diode D9 and a zener diode D10; one end of the capacitor C4 and one end of the capacitor C5 are connected in parallel to a switch control pin of the switching power supply chip, and the other ends of the capacitor C4 and the capacitor C5 are respectively connected with the cathodes of the voltage stabilizing diode D7 and the voltage stabilizing diode D8; the anode and the cathode of the zener diode D9 are respectively connected with the cathode of the zener diode D7 and the second output end; the anode and the cathode of the zener diode D10 are respectively connected with the cathode of the zener diode D8 and the anode of the zener diode D7; the anode of the voltage stabilizing diode D8 is connected to the negative voltage stabilizing circuit.
Preferably, the positive voltage stabilizing circuit and the negative voltage stabilizing circuit are TL341 stabilizing circuits.
Preferably, the positive voltage stabilizing circuit comprises a TL341 chip, an NPN triode, a resistor R1 and a resistor R2; the cathode of the TL341 chip is connected with the base electrode of the NPN triode, the reference electrode is grounded through the resistor R1, and the anode is grounded; the collector of the NPN triode is connected with the positive voltage boosting circuit, and the emitter of the NPN triode is grounded after being connected with the resistor R2 and the resistor R1 in series; and the emitter of the NPN triode outputs a third output value.
Preferably, the negative voltage stabilizing circuit comprises a TL341 chip, a PNP triode, a resistor R3 and a resistor R4; the anode of the TL341 chip is connected with the base of the PNP triode, the reference electrode is grounded through the resistor R3, and the cathode is grounded; the collector of the PNP triode is connected with the negative voltage booster circuit, and the emitter of the PNP triode is grounded after being connected with the resistor R4 and the resistor R3 in series; and the emitter of the PNP triode outputs a fourth output value.
Preferably, the switching power supply chip is a TPS65131 chip; the first output value is 5.5V; the second output value is-5.5V; the third output value is 19V; the fourth output value is-13V.
From the above, use the utility model provides a technical scheme can obtain following beneficial effect:
the technical scheme that this patent provided has reduced switching power supply chip's use quantity under the prerequisite that satisfies display screen driving voltage demand, and then reduction in production cost has retrencied drive circuit simultaneously, has further reduced the PCB overall arrangement degree of difficulty.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a circuit diagram of a government voltage output circuit of embodiment 1 of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
The existing display screen driving circuit usually needs two switching power supply chips to respectively provide four driving voltages required by the display screen, but the adoption of the mode can cause the problems of higher production cost, more parts on a PCB and high PCB layout difficulty.
As shown in fig. 1, in order to solve the above problem, the present embodiment proposes a multi-path positive and negative voltage output circuit using one switching power supply chip, which includes a display screen connected to the positive and negative voltage output circuit, and further includes a switching power supply chip 10, a positive voltage boost circuit 20, a negative voltage boost circuit 30, a positive voltage stabilizing circuit 40, and a negative voltage stabilizing circuit 50; a first output end and a second output end of the switching power supply chip 10 respectively output a first output value and a second output value; the first output end also outputs a third output value after passing through the positive voltage booster circuit 20 and the positive voltage stabilizing circuit 40; the second output end also outputs a fourth output value after passing through the negative voltage booster circuit 30 and the negative voltage stabilizing circuit 50; the first output value and the second output value are positive and negative voltages; the first output value, the second output value, the third output value and the fourth output value are respectively connected with the display screen and used for driving the display screen.
In this embodiment, the first output value, the second output value, the third output value and the fourth output value are respectively used as AVDDP, AVDDM, VGH and VGL in the display panel driving voltage; the AVDDP and AVDDM can be directly obtained by configuration of a chip specification of the switching power supply chip 10, and described by taking TPS65131 as an example of the switching power supply chip 10 in fig. 1 of the specification, first and second output values output by VPOS and OUTN terminals are 5.5V and-5.5V, respectively, and are AVDDP and AVDDM, respectively; in addition, after the first output value and the second output value are respectively boosted and stabilized, a third output value and a fourth output value which are 19V and-13V are formed, and can be correspondingly used as VGH and VGL required by the display screen for driving the display screen.
Preferably, the positive voltage boost circuit 20 and the negative voltage boost circuit 30 are both capacitance diode boost circuits. In this embodiment, the boosting process of the first output value and the second output value can be completed by using the other boosting circuits.
Preferably, the positive voltage boost circuit 20 is a quadruple boost circuit and the negative voltage boost circuit 30 is a triple boost circuit. In particular, according to the requirements of different display screens for driving voltages, the positive voltage boost circuit 20 and the negative voltage boost circuit 30 with different multiples can be used to obtain the driving voltages required by the corresponding display screens.
In the present embodiment, the positive voltage boost circuit 20 includes a capacitor C1, a capacitor C2, a capacitor C3, a zener diode D1, a zener diode D2, a zener diode D3, a zener diode D4, a zener diode D5, and a zener diode D6; one end of each of the capacitor C1, the capacitor C2 and the capacitor C3 is connected in parallel to a switch control pin of the switching power supply chip 10, and the other end of each of the capacitor C1, the capacitor C2 and the capacitor C3 is connected with the anodes of the zener diode D1, the zener diode D2 and the zener diode D3; the anode and the cathode of the voltage stabilizing diode D4 are respectively connected with the first output end and the anode of the voltage stabilizing diode D1; the anode and the cathode of the zener diode D5 are respectively connected with the cathode of the zener diode D1 and the anode of the zener diode D2; the anode and the cathode of the zener diode D6 are respectively connected with the cathode of the zener diode D2 and the anode of the zener diode D3; the negative electrode of the zener diode D3 is connected to the positive voltage stabilizing circuit 40.
In the embodiment, the switching power supply chip 10 controls the operation of the positive voltage boost circuit 20 through the SW terminal, and the capacitors C1, C2 and C3 are connected in parallel to the SW terminal, so as to ensure that the on-off process of the positive voltage boost circuit 20 and the potential variation of the SW terminal are synchronously controlled.
In this embodiment, the negative voltage boost circuit 30 includes a capacitor C4 and a capacitor C5, and further includes a zener diode D7, a zener diode D8, a zener diode D9, and a zener diode D10; one end of the capacitor C4 and one end of the capacitor C5 are connected in parallel to a switch control pin of the switching power supply chip 10, and the other ends are respectively connected with the cathodes of the zener diode D7 and the zener diode D8; the anode and the cathode of the voltage stabilizing diode D9 are respectively connected with the cathode of the voltage stabilizing diode D7 and a second output end; the anode and the cathode of the zener diode D10 are respectively connected with the cathode of the zener diode D8 and the anode of the zener diode D7; the anode of the zener diode D8 is connected to the negative voltage stabilizing circuit 50.
In this embodiment, one end of the capacitor C4 and one end of the capacitor C5 in the negative voltage boost circuit 30 are connected in parallel to the SW end of the switching power supply chip 10, so that the instant on-off control process of the pin evaluation change of the switching power supply chip 10 on the negative voltage boost circuit 30 is also realized.
Preferably, the positive voltage stabilizing circuit 40 and the negative voltage stabilizing circuit 50 are TL341 stabilizing circuits.
In the present embodiment, TL341 is used as a controllable precision voltage regulator, and its output voltage can be arbitrarily set to any value ranging from Vref (2.5V) to 36V by using two resistors. Therefore, by using the TL341 as the center of the voltage stabilizing circuit in this embodiment, the variation range of the third output value and the fourth output value outputted by the positive voltage stabilizing circuit 40 and the negative voltage stabilizing circuit 50 can be greatly increased.
In the present embodiment, the positive voltage stabilizing circuit 40 includes a TL341 chip, an NPN transistor, a resistor R1 and a resistor R2; the cathode of the TL341 chip is connected with the base electrode of the NPN triode, the reference electrode is grounded through a resistor R1, and the anode is grounded; the collector of the NPN triode is connected with the positive voltage booster circuit 20, and the transmitter is grounded after being connected with the resistor R2 and the resistor R1 in series; the transmitter of the NPN triode outputs a third output value.
In this embodiment, the negative voltage stabilizing circuit 50 includes a TL341 chip, a PNP transistor, a resistor R3 and a resistor R4; the anode of the TL341 chip is connected with the base electrode of the PNP triode, the reference electrode is grounded through a resistor R3, and the cathode is grounded; the collector of the PNP triode is connected with the negative voltage booster circuit 30, and the emitter is connected with the resistor R4 and the resistor R3 in series and then is grounded; and the emitter of the PNP triode outputs a fourth output value.
In the present embodiment, the negative electrode of the zener diode D3 in the positive voltage boost circuit 20 is connected to the collector of the NPN transistor in the positive voltage stabilizing circuit 40, and the positive electrode of the zener diode D8 in the negative voltage boost circuit 30 is connected to the collector of the PNP transistor in the negative voltage stabilizing circuit 50, so that the smooth connection between the positive voltage boost circuit 20 and the positive voltage stabilizing circuit 40 and the smooth connection between the negative voltage boost circuit 30 and the negative voltage stabilizing circuit 50 are realized.
In this embodiment, a third output value is obtained according to the first output value, and a fourth output value is obtained according to the second output value, and the third output value is obtained mainly through voltage boosting and voltage stabilizing, wherein after four times of voltage boosting by the positive voltage boosting circuit, V1 is 4 × AVDDP-3Vfd is 21.1V (Vfd is diode voltage drop about 0.3V), and then the required third output value is obtained through the positive voltage stabilizing circuit; similarly, after the second output value is boosted by three times through the negative voltage boost circuit, V2 ═ - (2AVDDP +2Vfd-AVDDM) +4Vfd ═ 15.9V, and then the fourth output value-13V is obtained through the negative voltage stabilizing circuit.
In summary, according to the multi-path positive and negative voltage output circuit adopting one switching power supply chip provided by the embodiment, four driving voltages required by the display screen are provided mainly through one switching power supply, so that the number of the switching power supply chips in the driving circuit can be reduced, the number of PCB assembly parts is further reduced, and the PCB layout difficulty is reduced.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (9)
1. A multi-path positive and negative voltage output circuit adopting a switching power supply chip comprises a display screen connected with the positive and negative voltage output circuit; the method is characterized in that: the power supply circuit also comprises a switching power supply chip (10), a positive voltage booster circuit (20), a negative voltage booster circuit (30), a positive voltage stabilizing circuit (40) and a negative voltage stabilizing circuit (50); a first output end and a second output end on the switching power supply chip (10) respectively output a first output value and a second output value; the first output end also outputs a third output value after passing through the positive voltage booster circuit (20) and the positive voltage stabilizing circuit (40); the second output end also outputs a fourth output value after passing through the negative voltage booster circuit (30) and the negative voltage stabilizing circuit (50); the first output value and the second output value are positive and negative voltages; the first output value, the second output value, the third output value and the fourth output value are respectively connected with the display screen and used for driving the display screen.
2. The multi-path positive and negative voltage output circuit using a switching power supply chip according to claim 1, wherein: the positive voltage booster circuit (20) and the negative voltage booster circuit (30) are both capacitor diode booster circuits.
3. The multi-path positive and negative voltage output circuit using a switching power supply chip according to claim 2, wherein: the positive voltage boosting circuit (20) is a quadruple boosting circuit, and the negative voltage boosting circuit (30) is a triple boosting circuit.
4. The multi-path positive and negative voltage output circuit using a switching power supply chip according to claim 3, wherein: the positive voltage boosting circuit (20) comprises a capacitor C1, a capacitor C2, a capacitor C3, a zener diode D1, a zener diode D2, a zener diode D3, a zener diode D4, a zener diode D5 and a zener diode D6; one end of each of the capacitor C1, the capacitor C2 and the capacitor C3 is connected in parallel to a switch control pin of the switching power supply chip (10), and the other end of each of the capacitor C1, the capacitor C2 and the capacitor C3 is connected with the anode of a voltage stabilizing diode D1, a voltage stabilizing diode D2 and a voltage stabilizing diode D3 respectively; the anode and the cathode of the zener diode D4 are respectively connected with the first output end and the anode of the zener diode D1; the anode and the cathode of the zener diode D5 are respectively connected with the cathode of the zener diode D1 and the anode of the zener diode D2; the anode and the cathode of the zener diode D6 are respectively connected with the cathode of the zener diode D2 and the anode of the zener diode D3; the negative electrode of the voltage stabilizing diode D3 is connected to the positive voltage stabilizing circuit (40).
5. The multi-path positive and negative voltage output circuit using a switching power supply chip according to claim 3, wherein: the negative voltage boosting circuit (30) comprises a capacitor C4, a capacitor C5, a voltage stabilizing diode D7, a voltage stabilizing diode D8, a voltage stabilizing diode D9 and a voltage stabilizing diode D10; one end of the capacitor C4 and one end of the capacitor C5 are connected to a switch control pin of the switching power supply chip (10) in parallel, and the other ends of the capacitor C4 and the capacitor C5 are respectively connected with the cathodes of the voltage stabilizing diode D7 and the voltage stabilizing diode D8; the anode and the cathode of the zener diode D9 are respectively connected with the cathode of the zener diode D7 and the second output end; the anode and the cathode of the zener diode D10 are respectively connected with the cathode of the zener diode D8 and the anode of the zener diode D7; the anode of the voltage stabilizing diode D8 is connected to the negative voltage stabilizing circuit (50).
6. The multi-path positive and negative voltage output circuit using a switching power supply chip according to claim 1, wherein: the positive voltage stabilizing circuit (40) and the negative voltage stabilizing circuit (50) are TL341 stabilizing circuits.
7. The multi-path positive-negative voltage output circuit adopting a switching power supply chip according to claim 6, characterized in that: the positive voltage stabilizing circuit (40) comprises a TL341 chip, an NPN triode, a resistor R1 and a resistor R2; the cathode of the TL341 chip is connected with the base electrode of the NPN triode, the reference electrode is grounded through the resistor R1, and the anode is grounded; the collector of the NPN triode is connected with the positive voltage boosting circuit (20), and the emitter of the NPN triode is connected with the resistor R2 and the resistor R1 in series and then grounded; and the emitter of the NPN triode outputs a third output value.
8. The multi-path positive-negative voltage output circuit adopting a switching power supply chip according to claim 6, characterized in that: the negative voltage stabilizing circuit (50) comprises a TL341 chip, a PNP triode, a resistor R3 and a resistor R4; the anode of the TL341 chip is connected with the base electrode of the PNP triode, the reference electrode is grounded through the resistor R3, and the cathode is grounded; the collector of the PNP triode is connected with the negative voltage booster circuit (30), and the emitter of the PNP triode is connected with the resistor R4 and the resistor R3 in series and then is grounded; and the emitter of the PNP triode outputs a fourth output value.
9. A multi-path positive-negative voltage output circuit using a switching power supply chip according to any one of claims 1 to 8, characterized in that: the switching power supply chip (10) is a TPS65131 chip; the first output value is 5.5V; the second output value is-5.5V; the third output value is 19V; the fourth output value is-13V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020450526.0U CN211788105U (en) | 2020-03-31 | 2020-03-31 | Multi-path positive and negative voltage output circuit adopting one switching power supply chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020450526.0U CN211788105U (en) | 2020-03-31 | 2020-03-31 | Multi-path positive and negative voltage output circuit adopting one switching power supply chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211788105U true CN211788105U (en) | 2020-10-27 |
Family
ID=72928812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020450526.0U Active CN211788105U (en) | 2020-03-31 | 2020-03-31 | Multi-path positive and negative voltage output circuit adopting one switching power supply chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211788105U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466240A (en) * | 2020-12-14 | 2021-03-09 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system |
-
2020
- 2020-03-31 CN CN202020450526.0U patent/CN211788105U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466240A (en) * | 2020-12-14 | 2021-03-09 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted display screen voltage abnormity detection and automatic reset circuit, method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102959610A (en) | Display device and drive method for same | |
| EP0756190A1 (en) | Power supply circuit, power supply for liquid crystal display, and liquid crystal display | |
| CN211788105U (en) | Multi-path positive and negative voltage output circuit adopting one switching power supply chip | |
| CN104679087A (en) | Vehicle-mounted low-dropout linear voltage stabilizer circuit and low-voltage compensating circuit thereof | |
| US20180376553A1 (en) | Driver and led lamp comprising driver | |
| CN103065589A (en) | Backlight driving circuit and liquid crystal display | |
| CN203812132U (en) | Low-dropout voltage stabilizing circuit with temperature compensation | |
| CN1890573B (en) | Buffer circuit, driver circuit, semiconductor test device and semiconductor integrated cirduit | |
| CN104935161A (en) | Timing control (TCON) power supply management circuit for onboard display screen | |
| CN202067516U (en) | Electronic ink screen power drive circuit | |
| CN212380941U (en) | Overvoltage and surge protection circuit and electronic equipment | |
| CN208954615U (en) | Display device, display panel voltage source system and its circuit | |
| CN100574071C (en) | Direct current is to DC converting circuit | |
| CN207732622U (en) | Output voltage constant-voltage control circuit | |
| CN210984237U (en) | PWM conversion circuit and backlight drive circuit | |
| US7965287B2 (en) | Power supply switching circuit capable of voltage regulation and flat panel display using same | |
| CN114764125A (en) | Testing device for low dropout regulator | |
| CN109949774B (en) | Circuit for acquiring secondary negative voltage | |
| CN207817567U (en) | DC-DC output voltage regulation circuits based on PWM controls | |
| CN115171623B (en) | Driving circuit and display device | |
| CN215815122U (en) | Liquid crystal display screen detection device | |
| CN213991126U (en) | Novel multi-power control integrated circuit board | |
| CN2786682Y (en) | Accurate voltage-stabilizing circuit | |
| CN220108262U (en) | Input voltage regulating circuit and LED driving device | |
| CN215186457U (en) | Power circuit capable of realizing multi-module synchronous starting and power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |