CN213186640U - Chip power supply circuit, LED drive power supply, drive integrated circuit board and display device - Google Patents
Chip power supply circuit, LED drive power supply, drive integrated circuit board and display device Download PDFInfo
- Publication number
- CN213186640U CN213186640U CN202021375833.3U CN202021375833U CN213186640U CN 213186640 U CN213186640 U CN 213186640U CN 202021375833 U CN202021375833 U CN 202021375833U CN 213186640 U CN213186640 U CN 213186640U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- chip
- voltage
- resistor
- 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
- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a chip supply circuit, LED drive power supply, drive integrated circuit board and display device, chip supply circuit includes: the device comprises a transformer, an absorption circuit, an MOS (metal oxide semiconductor) tube and a voltage stabilizing circuit; the first end of the primary winding of the transformer is connected with a power supply, the second end of the primary winding of the transformer is connected with the drain electrode of the MOS tube, and the source electrode of the MOS tube is grounded; the absorption circuit comprises a capacitor and a diode which are connected in series, wherein the first end of the capacitor is connected with the first end of the primary winding of the transformer, the second end of the capacitor is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the drain electrode of the MOS tube; the input end of the voltage stabilizing circuit is connected with the cathode of the diode, and the output end of the voltage stabilizing circuit is used for providing power for the chip. The utility model discloses a chip supply circuit has simplified original LED drive power supply's chip supply circuit's circuit structure, and is with low costs, has improved the electric energy conversion efficiency who has LED drive power supply circuit.
Description
Technical Field
The utility model relates to a power supply circuit especially relates to a chip supply circuit, LED drive power supply, drive integrated circuit board and display device.
Background
In recent years, LEDs (Light Emitting diodes) are widely used as a green and energy-saving Light source in lighting systems and in the field of home appliances for backlight display of display devices. In a traditional LED dimming mode, constant current is mainly output through a constant current driving circuit to control the brightness of an LED.
As shown in fig. 1, in the conventional LED driving power circuit, a secondary winding needs to be added to a transformer, so that a voltage VCC is LED out to supply power to the switching control chip U1, and a starting circuit needs to be LED in from the outside of the LED driving power supply to provide power to the switching control chip U1 before an output is established by the transformer T1, which results in a complicated structure and high cost of the power supply circuit of the switching control chip U1.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming and not enough, provide a simple structure, with low costs chip supply circuit, LED drive power supply, drive integrated circuit board and display device.
In a first aspect, the utility model provides a chip power supply circuit, which comprises a transformer, an absorption circuit, an MOS tube and a voltage stabilizing circuit;
the first end of the primary winding of the transformer is connected with a power supply, the second end of the primary winding of the transformer is connected with the drain electrode of the MOS tube, and the source electrode of the MOS tube is grounded;
the absorption circuit comprises a capacitor and a diode which are connected in series, wherein the first end of the capacitor is connected with the first end of the primary winding of the transformer, the second end of the capacitor is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the drain electrode of the MOS tube;
the input end of the voltage stabilizing circuit is connected with the cathode of the diode, and the output end of the voltage stabilizing circuit is used for providing power for the chip.
Optionally, the voltage stabilizing circuit includes a conducting switch, a first resistor and a clamping circuit;
the conducting switch comprises a control end, a current input end and a current output end, the current input end of the conducting switch is connected with the first end of the first resistor, and the current output end is used for supplying power to the chip; when the control end of the conduction switch reaches the controlled voltage, the current input end and the current output end are conducted;
the clamping circuit comprises an input end, an output end and a reference connecting end, the input end of the clamping circuit is connected with the cathode of the diode, the output end of the clamping circuit is grounded, and the reference connecting end of the clamping circuit is connected with the control end of the conducting switch;
and the second end of the first resistor is connected with the cathode of the diode.
Optionally, the conducting switch is an NPN-type triode; the grid electrode of the triode is the control end of the conducting switch, the collector electrode of the triode is the current input end of the conducting switch, and the emitter electrode of the triode is the current output end of the conducting switch;
optionally, the clamping circuit includes a voltage regulator tube and a second resistor;
the negative electrode of the voltage-stabilizing tube is connected with the first end of the second resistor, the negative electrode of the voltage-stabilizing tube is further connected with the reference connecting end of the clamping circuit, the positive electrode of the voltage-stabilizing tube is connected with the output end of the clamping circuit, and the second end of the second resistor is connected with the input end of the clamping circuit.
Optionally, the voltage stabilizing circuit further includes a first electrolytic capacitor, an anode of the first electrolytic capacitor is connected to the current output terminal of the conduction switch, and a cathode of the first electrolytic capacitor is grounded.
Optionally, the absorption circuit further includes a third resistor, and the third resistor is connected in parallel with the capacitor.
In a second aspect, the present invention provides a LED driving power supply, including the on-off control chip and the chip power supply circuit as described in any one above, the power end of the on-off control chip is connected to the output end of the voltage stabilizing circuit, the control end of the on-off control chip is connected to the gate of the MOS transistor.
Optionally, the transformer further comprises a constant current control circuit, wherein the constant current control circuit is used for receiving a voltage signal output by the secondary winding of the transformer and converting the voltage signal into a constant current signal.
A third aspect of the present invention provides a driving board, including the above-mentioned LED driving power source.
In a fourth aspect, the present invention provides a display device, comprising an LED load and the above-mentioned driving board;
and the current input end of the LED load is connected with the current output end of the constant current control circuit of the LED driving power supply.
The utility model discloses a chip power supply circuit utilizes absorption circuit absorption MOS pipe to turn-off the energy of time transformer primary winding, alleviate the voltage stress of the turn-off process of MOS pipe, and simultaneously, utilize voltage stabilizing circuit to maintain the stability of the signal of absorption circuit output and provide the power for the chip, the original circuit structure that has LED drive power supply chip power supply circuit has been simplified, and is with low costs, the power supply problem of chip has been solved, through the recycle of absorption circuit energy, the electric energy conversion efficiency who has LED drive power supply circuit has been improved.
For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a conventional LED driving power circuit;
fig. 2 is a schematic structural diagram of a chip power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a chip power supply circuit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a chip power supply circuit according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of an LED driving power supply according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving board card in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the mode of the present invention will be further described in detail with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
As shown in fig. 2, to the technical problem in the background art, the utility model provides a chip power supply circuit, include: transformer T1, absorption circuit 10, MOS tube Q1 and voltage regulator circuit 20.
The first end of the primary winding of the transformer T1 is connected with a power supply, the second end is connected with the drain electrode of the MOS tube Q1, and the source electrode of the MOS tube Q1 is grounded.
The absorption circuit 10 comprises a capacitor C1 and a diode D1 which are connected in series, wherein a first end of the capacitor C1 is connected with a first end of a primary winding of the transformer T1, a second end of the capacitor C1 is connected with a cathode of the diode D1, and an anode of the diode D1 is connected with a drain of the MOS transistor Q1.
The absorption circuit 10 is used for absorbing spike voltage when the MOS transistor Q1 is turned off, when the MOS transistor Q1 is turned off, the drain voltage of the MOS transistor Q1 rises rapidly, the diode D1 is turned on, the capacitor C1 starts to charge, most of energy in the transformer is transferred to the capacitor C1, and voltage stress in the turn-off process of the MOS transistor is relieved.
In one example, the absorption circuit 10 may further include a resistor R1 and a resistor R2 connected in series with each other, and the resistor R1 and the resistor R2 are connected in parallel with the capacitor C1 for dissipating energy of the absorption circuit, and in other examples, the absorption circuit may be in other forms, such as only one resistor, or the resistor may be connected in parallel with the diode D1, as long as the capacitor and the diode connected in series with the capacitor in the above example are included.
The MOS transistor Q1 is used for controlling the conducting state between the second end of the primary winding of the transformer T1 and the ground, when the controlled end of the MOS transistor Q1 receives the controlled voltage, the MOS transistor Q1 is turned on, the diode D1 is turned off, and the second end of the primary winding is grounded. In other examples, the MOS transistor may be replaced by another switching device having the above function.
The input end of the voltage stabilizing circuit 20 is connected with the cathode of the diode D1, and the output end of the voltage stabilizing circuit 20 is used for providing power supply for the chip P1.
The voltage stabilizing circuit 20 is used to maintain the stability of the voltage output by the absorption circuit, and the voltage stabilizing circuit 20 may be a voltage stabilizing circuit composed of an integrated circuit or a series voltage stabilizing circuit formed by a conducting switch, a current limiting resistor and a clamping circuit.
The embodiment of the utility model provides a theory of operation does:
when the LED driving power supply works normally, the MOS tube controls the conduction and the disconnection of the drain electrode and the source electrode according to the controlled voltage output by the switch control chip U1, so that the secondary winding of the transformer is controlled to output stable induction voltage. When the MOS transistor Q1 is turned off, the diode D1 is turned on, the capacitor C1 absorbs a peak voltage when the MOS transistor is turned off and charges the MOS transistor, and during charging and discharging of the capacitor C1, a stable power supply is provided for the switching control chip U1 through the voltage stabilizing circuit 20, so that a winding does not need to be arranged on the transformer T1, and a power supply is separately provided for the switching control chip U1.
In an embodiment, the switch control chip U1 is a driving chip of a primary control circuit of the LED driving power supply, and in other examples, the driving chip may also be another control chip in the LED driving power supply circuit.
The utility model discloses a chip power supply circuit utilizes absorption circuit absorption MOS pipe to turn-off the energy of time transformer primary winding, alleviate the voltage stress of the turn-off process of MOS pipe, and simultaneously, utilize voltage stabilizing circuit to maintain the stability of the signal of absorption circuit output and provide the power for the chip, the original circuit structure that has LED drive power supply chip power supply circuit has been simplified, and is with low costs, the power supply problem of chip has been solved, through the recycle of absorption circuit energy, the electric energy conversion efficiency who has LED drive power supply circuit has been improved.
As shown in FIG. 3, in one exemplary embodiment, the regulating circuit 20 includes a conducting switch 21, a first resistor R6, and a clamping circuit 22.
The conducting switch 21 comprises a control end 211, a current input end 212 and a current output end 213, the current input end 211 of the conducting switch 21 is connected with a first end of the first resistor R6, and the current output end 213 is used for supplying power to the chip; the control terminal 211 of the on-switch 21 turns on the current input terminal 212 and the current output terminal 213 when the controlled voltage is reached.
The clamp circuit 22 comprises an input terminal 221, an output terminal 222 and a reference connection terminal 223, wherein the input terminal 221 of the clamp circuit is connected to the cathode of the diode, the output terminal 222 of the clamp circuit is grounded, and the reference connection terminal 223 of the clamp circuit is connected to the control terminal 211 of the conducting switch. The clamping circuit 22 is used for providing a stable reference voltage source for the control terminal 211 of the conducting switch 21 through a reference connection terminal 223.
The second end of the first resistor R6 is connected to the cathode of the diode D1.
The conducting switch 21 may be a transistor, an MOS transistor, or other switching device, when the conducting switch 21 is a transistor, a gate of the transistor is a control terminal of the conducting switch 21, a collector of the transistor is a current input terminal of the conducting switch 21, and an emitter of the transistor is a current output terminal of the conducting switch 21. In other examples, the on switch 21 may be another switching device having the above-described function.
In one example, the clamping circuit 22 may include a voltage regulator tube and a current limiting resistor, a negative electrode of the voltage regulator tube is connected to a first end of the current limiting resistor, at this time, the first end of the current limiting resistor is connected to the reference connection end of the clamping circuit, a second end of the current limiting resistor is connected to an input end of the clamping circuit, a positive electrode of the voltage regulator tube is connected to an output end of the clamping circuit, and is grounded, in other examples, the clamping circuit 22 may also be another circuit having the function of outputting the stable reference voltage source.
In a specific example, as shown in fig. 4, the conducting switch 21 is a transistor Q2, the clamping circuit 22 includes a voltage regulator ZD1 and a resistor R7, when the input voltage increases, the current of the voltage regulator ZD1 increases, the voltage drop across the resistor R2 increases, and cancels out the increased input voltage, and the voltage across the voltage regulator remains unchanged, and similarly, when the input voltage decreases, the current of the voltage regulator ZD1 decreases, the voltage drop across the resistor R7 decreases, and cancels out the decreased input voltage, and the voltage across the voltage regulator ZD1 remains unchanged.
As shown in FIG. 4, in one example, the chip power supply circuit further includes resistors R1-R5 and electrolytic capacitors E1-E2.
The first end of the resistor R1 is connected with the first end of the capacitor C1, the second end of the resistor R1 is connected with the second end of the resistor R2, and the second end of the resistor R2 is connected with the second end of the capacitor C1. The capacitor C1 discharges through resistors R1-R2.
A first end of the resistor R3 is respectively connected with a GATE of the MOS transistor Q1 and a first end of the resistor R4, a second end of the resistor R3 is connected with a GATE end of the switch control chip U1, and a second end of the resistor R4 is connected with a first end of the resistor R5; the first end of the resistor R5 is connected with the source electrode of the MOS transistor Q1, and the second end of the resistor R5 is grounded.
The base electrode of the triode Q2 is respectively connected with the first end of a resistor R7 and the negative electrode of a voltage regulator tube ZD1, the second end of the resistor R6 is connected with the negative electrode of the diode D1, and the positive electrode of the voltage regulator tube ZD1 is grounded. The collector of the transistor Q2 is connected to a first terminal of a resistor R6, and a second terminal of the resistor R6 is connected to the cathode of the diode D1. And an emitter of the triode Q2 is respectively connected with a VCC end of the switch control chip U1 and the anode of the electrolytic capacitor E2, and the cathode of the electrolytic capacitor E2 is grounded. The resistor R7 is used for providing voltage for the base electrode of the triode, the electrolytic capacitor E2 is used for energy storage and filtering, and the emitter of the triode Q2 outputs stable voltage to supply power for the switch control chip U1.
The anode of the electrolytic capacitor E1 is connected with a power supply, and the cathode of the electrolytic capacitor E1 is grounded.
As shown in fig. 5, the utility model also provides a LED drive power supply, including switch control chip U1, as above anyone chip supply circuit 30 and constant current control circuit 40, switch control chip U1's VCC end with voltage stabilizing circuit's output is connected, switch control chip U1's GATE end with the GATE of MOS pipe is connected, constant current control circuit 40 is used for receiving the voltage signal of the secondary winding output of transformer and will voltage signal converts constant current signal of telecommunication into.
As shown in fig. 6, the present invention further provides a driving board 60 including the LED driving power supply 50.
As shown in fig. 7, the present invention further provides a display device 70, which includes an LED load 71 and the driving board 60.
And the current input end of the LED load 71 is connected with the current output end of the constant current control circuit of the LED driving power supply.
The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.
Claims (10)
1. A chip power supply circuit, characterized by:
the power supply comprises a transformer, an absorption circuit, an MOS tube and a voltage stabilizing circuit;
the first end of the primary winding of the transformer is connected with a power supply, the second end of the primary winding of the transformer is connected with the drain electrode of the MOS tube, and the source electrode of the MOS tube is grounded;
the absorption circuit comprises a capacitor and a diode which are connected in series, wherein the first end of the capacitor is connected with the first end of the primary winding of the transformer, the second end of the capacitor is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the drain electrode of the MOS tube;
the input end of the voltage stabilizing circuit is connected with the cathode of the diode, and the output end of the voltage stabilizing circuit is used for providing power for the chip.
2. The chip power supply circuit according to claim 1, wherein:
the voltage stabilizing circuit comprises a conducting switch, a first resistor and a clamping circuit;
the conducting switch comprises a control end, a current input end and a current output end, the current input end of the conducting switch is connected with the first end of the first resistor, and the current output end is used for supplying power to the chip; when the control end of the conduction switch reaches the controlled voltage, the current input end and the current output end are conducted;
the clamping circuit comprises an input end, an output end and a reference connecting end, the input end of the clamping circuit is connected with the cathode of the diode, the output end of the clamping circuit is grounded, and the reference connecting end of the clamping circuit is connected with the control end of the conducting switch;
and the second end of the first resistor is connected with the cathode of the diode.
3. The chip power supply circuit according to claim 2, wherein:
the conducting switch is an NPN type triode; the grid electrode of the triode is the control end of the conduction switch, the collector electrode of the triode is the current input end of the conduction switch, and the emitter electrode of the triode is the current output end of the conduction switch.
4. The chip power supply circuit according to claim 2 or 3, wherein:
the clamping circuit comprises a voltage regulator tube and a second resistor;
the negative electrode of the voltage-stabilizing tube is connected with the first end of the second resistor, the negative electrode of the voltage-stabilizing tube is further connected with the reference connecting end of the clamping circuit, the positive electrode of the voltage-stabilizing tube is connected with the output end of the clamping circuit, and the second end of the second resistor is connected with the input end of the clamping circuit.
5. The chip power supply circuit according to claim 2, wherein:
the voltage stabilizing circuit further comprises a first electrolytic capacitor, the anode of the first electrolytic capacitor is connected with the current output end of the conduction switch, and the cathode of the first electrolytic capacitor is grounded.
6. The chip power supply circuit according to claim 1, wherein:
the absorption circuit further comprises a third resistor, and the third resistor is connected with the capacitor in parallel.
7. An LED drive power supply characterized in that:
the power supply circuit comprises a switch control chip and the chip power supply circuit according to any one of claims 1 to 6, wherein a power supply end of the switch control chip is connected with an output end of the voltage stabilizing circuit, and a control end of the switch control chip is connected with a grid electrode of the MOS tube.
8. The LED driving power supply according to claim 7, wherein:
the transformer further comprises a constant current control circuit, and the constant current control circuit is used for receiving the voltage signal output by the secondary winding of the transformer and converting the voltage signal into a constant current electric signal.
9. A drive integrated circuit board, its characterized in that:
comprising the LED driving power supply according to claim 8.
10. A display device characterized by:
comprising an LED load and a driver board as claimed in claim 9;
and the current input end of the LED load is connected with the current output end of the constant current control circuit of the LED driving power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021375833.3U CN213186640U (en) | 2020-07-14 | 2020-07-14 | Chip power supply circuit, LED drive power supply, drive integrated circuit board and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021375833.3U CN213186640U (en) | 2020-07-14 | 2020-07-14 | Chip power supply circuit, LED drive power supply, drive integrated circuit board and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213186640U true CN213186640U (en) | 2021-05-11 |
Family
ID=75792613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021375833.3U Active CN213186640U (en) | 2020-07-14 | 2020-07-14 | Chip power supply circuit, LED drive power supply, drive integrated circuit board and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213186640U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685873A (en) * | 2021-07-30 | 2021-11-23 | 江西锋铄新能源科技有限公司 | Ecological computing power type cold and hot electric system |
| CN114744851A (en) * | 2022-04-20 | 2022-07-12 | 天长市富安电子有限公司 | Energy recovery circuit for chip power supply |
-
2020
- 2020-07-14 CN CN202021375833.3U patent/CN213186640U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685873A (en) * | 2021-07-30 | 2021-11-23 | 江西锋铄新能源科技有限公司 | Ecological computing power type cold and hot electric system |
| CN114744851A (en) * | 2022-04-20 | 2022-07-12 | 天长市富安电子有限公司 | Energy recovery circuit for chip power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213186640U (en) | Chip power supply circuit, LED drive power supply, drive integrated circuit board and display device | |
| US11528791B2 (en) | Driving circuit | |
| CN202177974U (en) | LED traffic signal lamp and drive circuit thereof | |
| CN204031553U (en) | A kind of LED drive circuit and soft starting circuit thereof | |
| CN104185333A (en) | Constant-current constant-voltage circuit and illuminating device | |
| CN103491689B (en) | Controllable silicon light modulation LED driving switch power circuit | |
| CN207369369U (en) | LED power and LED display device | |
| CN107249235B (en) | LED drive circuit compatible with indicator light switch | |
| CN104918360A (en) | Comprehensive protection circuit of LED power supply | |
| EP3397026A1 (en) | Miswiring protection circuit for use with a dc power supply and an led lamp | |
| CN205336586U (en) | Lighting circuit and remote controller | |
| CN211606889U (en) | Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment | |
| CN115411925A (en) | Flyback switching power supply starting conduction control circuit and device | |
| CN210202140U (en) | LED induction lamp control circuit based on LED constant current driving power supply | |
| CN216960262U (en) | Control circuit for eliminating LED power supply shutdown flicker | |
| CN109936888B (en) | High-frequency driving circuit and lighting device using same | |
| CN111163560A (en) | Control circuit for 0-10V small dimming quick start | |
| CN111404404A (en) | Switching power supply circuit and L ED lamp | |
| CN106455209B (en) | Dimming interface circuit and AC driving circuit | |
| CN213126545U (en) | Energy-saving control circuit of backlight source | |
| CN216819712U (en) | Switching power supply circuit with long power-down retention time | |
| CN218649004U (en) | LED driving power supply capable of eliminating afterglow after being turned off | |
| CN221597714U (en) | Feedback control circuit of flyback power supply and flyback power supply control device | |
| CN204290451U (en) | Charger | |
| CN213243518U (en) | Power-down protection circuit, LED driving power supply, driving board card and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |