CN211606889U - Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment - Google Patents
Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment Download PDFInfo
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- CN211606889U CN211606889U CN201922020635.9U CN201922020635U CN211606889U CN 211606889 U CN211606889 U CN 211606889U CN 201922020635 U CN201922020635 U CN 201922020635U CN 211606889 U CN211606889 U CN 211606889U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model relates to an overvoltage crowbar, constant current drive circuit, drive integrated circuit board and electronic equipment. The overvoltage protection circuit of the utility model comprises a power supply circuit and a protection circuit, wherein the power supply circuit comprises an isolation output circuit and a first conduction switch, and the protection circuit comprises a three-terminal voltage regulator tube, a first resistor and a second resistor; the isolation output circuit comprises a power supply end, a drive end and an output end; the first end of the first resistor is used for being connected with a backlight driving power supply, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded; the three-terminal voltage regulator tube comprises a reference electrode, an anode and a cathode, the reference electrode is connected with the connecting end between the first resistor and the second resistor, the anode is grounded, and the cathode is connected with a power supply end of the isolation output circuit. The utility model discloses an overvoltage crowbar can be when the circuit open circuit in a poor light, cuts off power supply circuit's output.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to an overvoltage crowbar, constant current drive circuit, drive integrated circuit board and electronic equipment.
Background
In recent years, LEDs (Light Emitting diodes) are widely used as a green and energy-saving Light source in lighting systems and electronic devices in the field of household appliances for backlight display. In a traditional LED dimming mode, a controller is combined with an external constant current control chip to output constant current to control the brightness of an LED.
When a backlight control circuit adopts a double flyback framework (a main board supplies power to use a small flyback, and a backlight supplies power to use a large flyback), in order to control a primary PFC and a backlight flyback circuit switch, the VCC power supply circuit shown in figure 1 is adopted, the scheme adopts an optocoupler as a primary and secondary signal transmission device, when an ON signal is at a high level, Q1 is switched ON, 5V supplies power to an optocoupler LED lamp through a resistor R1, under the action of an optical signal, an optocoupler phototriode is switched ON, VCC1 supplies a signal to a base of a switch tube Q2 after voltage division is carried out through a resistor R4 and R5, so that the switch tube Q2 is switched ON, and VCC2 forms a voltage which is used for supplying power to the primary PFC and the backlight flyback circuit.
However, after the backlight is opened, the PFC power drops sharply, causing the PFC to operate in an intermittent or down-conversion mode, which may cause noise generated by the thin film capacitor and the transformer in the PFC circuit.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides an overvoltage crowbar, constant current drive circuit, drive integrated circuit board and electronic equipment can be when backlight circuit opens, cuts off power supply circuit's output.
In a first aspect, the present invention provides an overvoltage protection circuit, including:
the protection circuit comprises a three-terminal voltage regulator tube, a first resistor and a second resistor;
the isolation output circuit comprises a power supply end, a driving end and an output end, and the power supply end is connected with a power supply end of the power supply circuit;
the first conduction switch comprises a first current input end, a first current output end and a first discharge control end, the first current input end is connected with the drive end of the isolation output circuit, and the first current output end is grounded; the first discharge control end is used for being connected with a backlight circuit control signal, the first discharge control end is used for conducting the first current input end and the first current output end when the first discharge control end is at a high level, and the first discharge control end is used for disconnecting the first current input end and the first current output end when the first discharge control end is at a low level;
the first end of the first resistor is used for being connected with a backlight driving power supply, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the three-terminal voltage regulator tube comprises a reference electrode, an anode and a cathode, the reference electrode is connected with the connecting end between the first resistor and the second resistor, the anode is grounded, and the cathode is connected with a power supply end of the isolation output circuit.
Optionally, the resistances of the first resistor and the second resistor are configured to: when the voltage of the backlight driving power supply is equal to a set over-voltage lower limit, the voltage of a connecting end between the first resistor and the second resistor is equal to the reference voltage of the three-terminal voltage regulator tube;
the three-terminal voltage regulator tube is used for switching from cut-off to conduction when the input voltage of the reference electrode is greater than the reference voltage.
Optionally, the first conduction switch includes a triode, the first current input terminal is a collector of the triode, the first current output terminal is an emitter of the triode, and the first discharge control terminal is a base set of the triode.
Optionally, the power supply circuit further includes a third resistor, and the base set of the triode is grounded through the third resistor.
Optionally, the isolation output circuit is an optical coupler, the optical coupler includes a coupled light emitter and a coupled light receiver, a driving end of the isolation output circuit is an output end of the light emitter, a power supply end of the isolation output circuit is an input end of the light emitter, and an output end of the isolation output circuit is an output end of the light receiver.
Optionally, the light emitter is a light emitting diode, and the light receiver is a phototriode;
the output end of the light emitter is the cathode of the light emitting diode, the input end of the light emitter is the anode of the light emitting diode, and the output end of the light receiver comprises the collector and the emitter of the phototriode.
Optionally, the power supply circuit further includes a second conducting switch, a fourth resistor, and a fifth resistor;
the second conduction switch comprises a second current input end, a second current output end and a second discharge control end, the second current input end is connected with the input end of the control power supply, the second current output end is connected with the output end of the control power supply, the second discharge control end is connected with the emitter of the phototriode, and the second discharge control end is also grounded through the fourth resistor;
and the emitter of the phototriode is connected with the second current input end through the fifth resistor.
In a second aspect, the present invention provides a constant current driving circuit, including:
the overvoltage protection circuit comprises a flyback constant current drive circuit and the overvoltage protection circuit of any one of the first aspect of the invention;
the flyback constant current driving circuit comprises a backlight driving power supply output end, and the backlight driving power supply output end is connected with the first end of the first resistor.
In a third aspect, the present invention provides a driving board, which comprises a backlight circuit control signal generating circuit and a constant current driving circuit according to the second aspect of the present invention;
the backlight circuit control signal generating circuit is used for generating a backlight circuit control signal, and the output end of the backlight circuit control signal generating circuit is connected with the first discharging control end of the first conduction switch.
In a fourth aspect, the present invention provides an electronic device, including:
including the LED load with the third aspect of the present invention the drive board, the LED load with the backlight drive power supply output is connected.
The utility model discloses in, when being shaded and opening a way, the drive power supply voltage that is shaded rises, first resistance with connecting terminal voltage between the second resistance rises to being greater than during the reference voltage of three-terminal regulator tube, the three-terminal regulator tube is from switching over for switching on, thereby makes supply circuit's power supply power end passes through three-terminal regulator tube ground connection, thereby cuts off isolation output circuit's output signal to turn off electronic equipment's drive circuit that is shaded, thin film capacitance and the transformer on the PFC circuit that avoids being shaded and open a way and cause produce the abnormal sound.
For better understanding and implementation, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a VCC power supply circuit in the background art;
fig. 2 is a schematic diagram of an embodiment of the overvoltage protection circuit of the present invention;
fig. 3 is a schematic diagram of a specific circuit structure of the overvoltage protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a backlight driving circuit of a dual flyback architecture according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a constant current driving circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a driving board card in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In the following, several specific embodiments are given for describing the technical solution of the present application in detail. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a schematic structural diagram of an overvoltage protection circuit in an exemplary embodiment of the present application, where the overvoltage protection circuit provided in this embodiment includes a power supply circuit and a protection circuit, the power supply circuit includes an isolated output circuit 1 and a first conducting switch 2, and the protection circuit includes a three-terminal regulator U1, a first resistor R1, and a second resistor R2.
The isolation output circuit 1 includes a power end 11, a driving end 12, and an output end 13, where the power end is connected to a power supply end of the power supply circuit, the power supply end is configured to connect to an external power supply, in an example, the power supply end is configured to receive a 5V power supply provided by a motherboard of an electronic device, the isolation output circuit 1 drives the output end 13 to output a signal when a voltage difference exists between the power end 11 and the driving end 12, and in some examples, drives an external circuit to provide a power supply for the backlight driving circuit when the output end 13 outputs a signal.
The first conduction switch 2 comprises a first current input end 21, a first current output end 22 and a first discharge control end 23, the first current input end 21 is connected with the driving end 12 of the isolation output circuit, and the first current output end 22 is grounded; the first discharge control terminal 23 is configured to be connected to a backlight circuit control signal Vk, in some examples, the backlight circuit control signal is configured to drive the backlight driving circuit to start operating, the first discharge control terminal 23 turns on the first current input terminal 21 and the first current output terminal 22 when the first discharge control terminal 23 is at a high level, and the first discharge control terminal 23 turns off the first current input terminal 21 and the first current output terminal 22 when the first discharge control terminal 23 is at a low level.
The first end of the first resistor R1 is used for being connected with a backlight driving power source VLED +, the backlight driving power source VLED + is used for providing a driving power source for an LED backlight source of an electronic device, when the backlight driving circuit works, the backlight driving power source VLED + is generated, the second end of the first resistor R1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is grounded.
The three-terminal regulator tube U1 comprises a reference pole R, an anode A and a cathode K, the reference pole R is connected with the connecting end between the first resistor R1 and the second resistor R2, the anode A is grounded, and the cathode K is connected with a power supply end 11 of the isolation output circuit 1.
The working principle of the overvoltage protection circuit of the embodiment is as follows:
after receiving the backlight circuit control signal Vk, the discharge control terminal 23 of the first conducting switch 2 is at a high level, so that the first current input terminal 21 and the first current output terminal 22 of the first conducting switch 2 are conducting, because the first current input terminal 21 is connected to the driving terminal 12 of the isolated output circuit 1 and the first current output terminal 22 is grounded, the driving terminal 12 of the isolated output circuit 1 is grounded at this time, and at this time, the power terminal 11 of the isolated output circuit 1 forms a voltage difference with the driving terminal 12 due to the connection of an external power supply, and the output terminal 13 outputs a signal to provide power for the backlight driving circuit.
When the backlight control circuit has faults such as open circuit and the like, the voltage of the backlight driving power supply VLED + is increased, so that the voltage of a connection point between the first resistor R1 and the second resistor R2 is increased, when the voltage of the connection point is higher than the reference voltage of the three-terminal regulator tube U1, the anode A and the cathode K of the three-terminal regulator tube U1 are conducted, the anode A of the three-terminal regulator tube U1 is grounded, and the cathode K is connected with the power supply end 11 of the isolation output circuit 1, so that the power supply end 11 of the isolation output circuit 1 is grounded through the three-terminal regulator tube U1 at the moment, no voltage difference exists between the power supply end 11 and the driving end 21 of the isolation output circuit 1, the output end 13 does not output signals any more, and the power supply provided for the backlight driving circuit is cut.
In the embodiment of the application, the backlight open circuit refers to loose or burnout of the backlight lamp strip and refers to abnormal open circuit. After the circuit is opened, the voltage on the backlight output capacitor is increased because the backlight energy is released without a loop.
The utility model discloses in, when being shaded and opening a way, the drive power supply voltage that is shaded rises, first resistance with connecting terminal voltage between the second resistance rises to being greater than during the reference voltage of three-terminal regulator tube, the three-terminal regulator tube is from switching over for switching on, thereby makes supply circuit's power supply power end passes through three-terminal regulator tube ground connection, thereby cuts off isolation output circuit's output signal to turn off electronic equipment's drive circuit that is shaded, thin film capacitance and the transformer on the PFC circuit that avoids being shaded and open a way and cause produce the abnormal sound.
In one embodiment, the resistances of the first resistor R1 and the second resistor R2 are configured to: when the voltage of the backlight driving power supply VLED + is equal to a set over-voltage lower limit, the voltage of a connection end between the first resistor R1 and the second resistor R2 is equal to the reference voltage of the three-terminal regulator tube U1; the three-terminal voltage regulator tube is used for switching from cut-off to conduction when the input voltage of the reference electrode is greater than the reference voltage.
In this embodiment, the resistance values of the first resistor R1 and the second resistor R2 are set to be 2.5V when the voltage of the backlight driving power supply VLED + is equal to the set over-voltage lower limit, and the voltage of the connection end between the first resistor R1 and the second resistor R2 is equal to 2.5V, so that when the backlight control circuit is open, the output of the isolation output circuit 1 can be cut off as soon as possible, and the power supply of the backlight driving circuit can be cut off.
In one embodiment, as shown in fig. 3, the conducting switch 2 comprises a transistor QB1, the first current input terminal 21 is a collector C of the transistor QB1, the first current output terminal 22 is an emitter E of the transistor QB1, and the first discharge control terminal 23 is a base set B of the transistor QB 1.
In other examples, the on-switch 5 may be other electronic components, such as a switch tube, for realizing the above-mentioned functions of the present invention.
In one embodiment, the power supply circuit further includes a third resistor R3, and the base B of the transistor QB1 is grounded through the third resistor R3. The power supply circuit may further include a sixth resistor R6, and in other examples, the base B of the transistor QB1 may be further connected to the backlight circuit control signal Vk through the sixth resistor R6.
In one embodiment, as shown in fig. 3, the isolation output circuit 1 is an optical coupler P1, the optical coupler P1 includes a light emitter and a light receiver coupled to each other, the driving terminal 12 of the isolation output circuit 1 is an output terminal of the light emitter, the power terminal 11 of the isolation output circuit 1 is an input terminal of the light emitter, and the output terminal 13 of the isolation output circuit 1 is an output terminal of the light receiver.
Specifically, the light emitter is a light emitting diode P1A, the light receiver is a phototransistor P1B, the output end of the light emitter is the negative electrode of the light emitting diode P1A, the input end of the light emitter is the positive electrode of the light emitting diode P1A, and the output end of the light receiver includes the collector and the emitter of the phototransistor P1B.
In one embodiment, the power supply circuit further includes a second conducting switch, a fourth resistor, and a fifth resistor.
The second conduction switch comprises a second current input end, a second current output end and a second discharge control end, the second current input end is connected with the input end of the control power supply, the second current output end is connected with the output end of the control power supply, the second discharge control end is connected with the emitter of the phototriode, and the second discharge control end is also grounded through the fourth resistor; and the emitter of the phototriode is connected with the second current input end through the fifth resistor.
Specifically, as shown in fig. 3, the second conducting switch is a transistor QB2, the second current input terminal is a collector C of the transistor QB2, the second current output terminal is an emitter E of the transistor QB2, and the second discharging control terminal is the base set B of the transistor QB 2.
The base set B of triode QB2 with the projecting pole of phototriode P1B is connected, the base set B of triode QB2 is still through fifth resistance R5 ground connection, the collecting electrode C of triode QB2 pass through fourth resistance R4 with the collecting electrode of phototriode P1B is connected. The collector C of the transistor QB2 is also connected to a control supply input, which in one example is connected to a supply VCC1, and the emitter E of the transistor QB2 is connected to a control supply output VCC 2.
The power supply VCC1 may be a power supply output by the small flyback auxiliary winding, and after passing through the overvoltage protection circuit in the embodiment of the present application, the power supply is provided for the backlight driving circuit by controlling the power supply output terminal VCC 2.
As shown in fig. 4, the overvoltage protection circuit in the embodiment of the present application may be applied to a backlight driving circuit of a dual flyback architecture, where the dual flyback architecture uses two transformers, a small flyback transformer is responsible for supplying power to a main chip of an electronic device, and an auxiliary winding outputs VCC1 to supply power to the chip of the small flyback transformer, and a large flyback transformer is responsible for providing a backlight power supply of VLED + to an LED backlight source.
The power supply end is connected with a 5V power supply provided by the main chip, and a backlight circuit control signal Vk is also given by the main chip of the electronic equipment and is used for controlling the switch of the LED backlight driving circuit. VCC1 connected to the input end of the control power supply is output by the small flyback auxiliary winding and is responsible for supplying power to the control chip of the small flyback, and VCC1 forms VCC2 through the overvoltage protection circuit of the embodiment of the application and mainly supplies power to the back light control chip and the PFC chip.
As shown in fig. 5, fig. 5 is a schematic structural diagram of the constant current driving circuit in an embodiment of the present invention, in this embodiment, the constant current driving circuit 500 includes a flyback constant current driving circuit 510 and an overvoltage protection circuit 520 as described in any of the above embodiments, the flyback constant current driving circuit 510 includes a backlight driving power output end 511, and the backlight driving power output end 511 is connected to a first end of the first resistor R1.
The utility model discloses constant current drive circuit can be applied to electronic equipment such as computer, cell-phone, panel computer, interactive intelligent flat board, PDA (Personal Digital Assistant), electronic book reader, multimedia player, drive power supply output 311 can be for the power supply of the different LED loads for above-mentioned electronic equipment in a poor light, the LED load can be the LED backlight.
Fig. 6 is a schematic structural diagram of a driving board card provided in an embodiment of the present invention. The driving board 600 includes a backlight circuit control signal generating circuit 610 and any constant current driving circuit 620 provided by the embodiment of the present invention, wherein the output end 611 of the backlight circuit control signal generating circuit 610 is connected to the first discharging control end 6211 of the first conduction switch 621.
When the backlight control signal is at a high level, the constant current driving circuit 620 is driven to work normally, and when the backlight control signal is at a low level, the constant current driving circuit 620 is turned off.
Fig. 7 is a schematic structural diagram of an electronic device provided in an embodiment of the present invention, where the electronic device 700 includes an LED load 710 and any driving board 600 provided in the present application, where one end of the LED load 710 is connected to the backlight driving power output VLED + of the driving board 600, and the other end is grounded.
Specifically, in a possible implementation manner, the electronic device is an interactive smart tablet, and the LED load 710 is an LED backlight of the interactive smart tablet.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. An overvoltage protection circuit, comprising:
the protection circuit comprises a three-terminal voltage regulator tube, a first resistor and a second resistor;
the isolation output circuit comprises a power supply end, a driving end and an output end, and the power supply end is connected with a power supply end of the power supply circuit;
the first conduction switch comprises a first current input end, a first current output end and a first discharge control end, the first current input end is connected with the drive end of the isolation output circuit, and the first current output end is grounded; the first discharge control end is used for being connected with a backlight circuit control signal, the first discharge control end is used for conducting the first current input end and the first current output end when the first discharge control end is at a high level, and the first discharge control end is used for disconnecting the first current input end and the first current output end when the first discharge control end is at a low level;
the first end of the first resistor is used for being connected with a backlight driving power supply, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the three-terminal voltage regulator tube comprises a reference electrode, an anode and a cathode, the reference electrode is connected with the connecting end between the first resistor and the second resistor, the anode is grounded, and the cathode is connected with a power supply end of the isolation output circuit.
2. The overvoltage protection circuit of claim 1, wherein:
the resistances of the first and second resistors are configured to: when the voltage of the backlight driving power supply is equal to a set over-voltage lower limit, the voltage of a connecting end between the first resistor and the second resistor is equal to the reference voltage of the three-terminal voltage regulator tube;
the three-terminal voltage regulator tube is used for switching from cut-off to conduction when the input voltage of the reference electrode is greater than the reference voltage.
3. The overvoltage protection circuit of claim 1, wherein:
the first conduction switch comprises a triode, the first current input end is a collector electrode of the triode, the first current output end is an emitter electrode of the triode, and the first discharge control end is a base set of the triode.
4. The overvoltage protection circuit of claim 3, wherein:
the power supply circuit further comprises a third resistor, and the base set of the triode is grounded through the third resistor.
5. The overvoltage protection circuit of any one of claims 1 to 4, wherein:
the isolation output circuit is an optical coupler, the optical coupler comprises a coupled light emitter and a coupled light receiver, the driving end of the isolation output circuit is the output end of the light emitter, the power supply end of the isolation output circuit is the input end of the light emitter, and the output end of the isolation output circuit is the output end of the light receiver.
6. The overvoltage protection circuit of claim 5, wherein:
the light emitter is a light emitting diode, and the light receiver is a phototriode;
the output end of the light emitter is the cathode of the light emitting diode, the input end of the light emitter is the anode of the light emitting diode, and the output end of the light receiver comprises the collector and the emitter of the phototriode.
7. The overvoltage protection circuit of claim 6, wherein:
the power supply circuit further comprises a second conducting switch, a fourth resistor and a fifth resistor;
the second conduction switch comprises a second current input end, a second current output end and a second discharge control end, the second current input end is connected with the input end of the control power supply, the second current output end is connected with the output end of the control power supply, the second discharge control end is connected with the emitter of the phototriode, and the second discharge control end is also grounded through the fourth resistor;
and the emitter of the phototriode is connected with the second current input end through the fifth resistor.
8. A constant current driving circuit is characterized in that:
the over-voltage protection circuit comprises a flyback constant-current driving circuit and the over-voltage protection circuit according to any one of claims 1 to 7;
the flyback constant current driving circuit comprises a backlight driving power supply output end, and the backlight driving power supply output end is connected with the first end of the first resistor.
9. A drive integrated circuit board, its characterized in that:
a constant current drive circuit according to claim 8 and including a backlight circuit control signal generation circuit;
the backlight circuit control signal generating circuit is used for generating a backlight circuit control signal, and the output end of the backlight circuit control signal generating circuit is connected with the first discharging control end of the first conduction switch.
10. An electronic device, characterized in that:
the backlight driving circuit board comprises an LED load and the driving board card of claim 9, wherein the LED load is connected with the output end of the backlight driving power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922020635.9U CN211606889U (en) | 2019-11-20 | 2019-11-20 | Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922020635.9U CN211606889U (en) | 2019-11-20 | 2019-11-20 | Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN211606889U true CN211606889U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922020635.9U Active CN211606889U (en) | 2019-11-20 | 2019-11-20 | Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment |
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| CN (1) | CN211606889U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365391A (en) * | 2021-04-28 | 2021-09-07 | 深圳市崧盛电子股份有限公司 | Intelligent dimming turn-off control circuit and driving power supply |
-
2019
- 2019-11-20 CN CN201922020635.9U patent/CN211606889U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365391A (en) * | 2021-04-28 | 2021-09-07 | 深圳市崧盛电子股份有限公司 | Intelligent dimming turn-off control circuit and driving power supply |
| CN113365391B (en) * | 2021-04-28 | 2022-08-05 | 深圳市崧盛电子股份有限公司 | Intelligent dimming turn-off control circuit and driving power supply |
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