CN211930928U - LED lamp driving protection circuit and lamp - Google Patents
LED lamp driving protection circuit and lamp Download PDFInfo
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- CN211930928U CN211930928U CN202020357868.8U CN202020357868U CN211930928U CN 211930928 U CN211930928 U CN 211930928U CN 202020357868 U CN202020357868 U CN 202020357868U CN 211930928 U CN211930928 U CN 211930928U
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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]
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Abstract
The application relates to a LED lamp drive protection circuit and lamps and lanterns, LED lamp drive protection circuit includes: the control circuit is used for receiving a control instruction sent by the host computer and sending the control instruction to the LED lamp; the constant current driving circuit is used for providing constant driving current for the LED lamp, receiving a control command issued by the control circuit and issuing the control command to the LED lamp; the voltage reduction power supply circuit is used for reducing the voltage of the mains supply and then providing power for the LED lamp driving circuit; and the signal protection circuit is used for performing overcurrent protection and overvoltage protection on the LED lamp driving protection circuit. The LED lamp driving protection circuit can provide constant power supply current for the LED lamp, and the signal protection circuit can realize automatic protection when the LED lamp generates abnormal voltage and current, so that the phenomenon that the LED lamp is damaged due to the change factors of the voltage and the current is avoided.
Description
Technical Field
The application relates to the technical field of lamps, in particular to an LED lamp driving protection circuit and a lamp.
Background
As the name implies, the LED lamp is a lamp product using an LED (Light-emitting diode) as a main Light source. The LED is a solid semiconductor device, which utilizes current flowing in the forward direction to the pn junction coupling of the semiconductor, and then two carriers, namely negatively charged electrons and positively charged holes separated in the semiconductor, are combined with each other to generate photon emission, and different types of LEDs can emit light with different wavelengths from infrared to blue light, and from violet to ultraviolet light. Recent new development is to coat fluorescent powder on a blue LED to convert the blue LED into a white LED product. This operation generally requires a driver circuit (LED driver) or power supply (PowerSupply), which mainly functions to convert ac voltage into dc power and simultaneously complete the voltage and current corresponding to the LEDs to drive the mating components.
In modern electronic technology circuits, the range of input signals or output signals for electronic devices is more critical, since the output or input signals of electronic devices are more demanding. For example, the voltage signal is too high, which easily causes the electronic device to burn out or affects the service life. In practice, when the LED driving power supply is unstable, the output voltage signal may be too high, which may easily damage the LED in the subsequent circuit. Or when the output load is too large and the internal element or the external circuit of the device is locally short-circuited in the working process of the LED constant current source drive, the load LED is over-current and is easily damaged.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides an LED lamp driving protection circuit and a lamp.
In a first aspect, the present application provides an LED lamp driving protection circuit, which includes:
the control circuit is used for receiving a control instruction sent by the host computer and sending the control instruction to the LED lamp;
the constant current driving circuit is used for providing constant driving current for the LED lamp, receiving a control command issued by the control circuit and issuing the control command to the LED lamp;
the voltage reduction power supply circuit is used for reducing the voltage of the mains supply and then providing power for the LED lamp driving circuit;
the signal protection circuit is used for carrying out overcurrent protection and overvoltage protection on the LED lamp driving protection circuit, and comprises a self-recovery fuse, a transient suppression diode, a first resistor and a second resistor, wherein a signal input end or a signal output end of the decoding chip is connected with a first end of the first resistor through the self-recovery fuse, the self-recovery fuse is grounded through the transient suppression diode, a second end of the first resistor is connected with an output end of the voltage reduction power supply circuit through the second resistor, and a second end of the first resistor is further connected with an external port.
Optionally, the control circuit includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
Optionally, the constant current driving circuit includes a buck converter, a constant driving current is provided for the LED lamp through the buck converter, and the buck converter sends a control instruction issued by the control circuit to the LED lamp through an external port to perform dimming control.
Optionally, the step-down power supply circuit includes a voltage stabilizer, and the voltage stabilizer reduces the input voltage to the LED lamp driving protection circuit to provide a constant power supply for the LED lamp driving protection circuit.
Optionally, the LED lamp driving protection circuit further includes an interface circuit, the interface circuit is connected to the control circuit, and the interface circuit is used for performing bidirectional data transmission between the host and the control circuit.
In a second aspect, the present embodiment provides a lamp, where the lamp includes an LED lamp and an LED lamp driving protection circuit, the LED lamp driving protection circuit includes:
the control circuit is used for receiving a control instruction sent by the host computer and sending the control instruction to the LED lamp;
the constant current driving circuit is used for providing constant driving current for the LED lamp, receiving a control command issued by the control circuit and issuing the control command to the LED lamp;
the voltage reduction power supply circuit is used for reducing the voltage of the mains supply and then providing power for the LED lamp driving circuit;
and the signal protection circuit is used for performing overcurrent protection and overvoltage protection on the LED lamp driving protection circuit.
Optionally, the control circuit includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
Optionally, the constant current driving circuit includes a buck converter, a constant driving current is provided for the LED lamp through the buck converter, and the buck converter sends a control instruction issued by the control circuit to the LED lamp through an external port to perform dimming control.
Optionally, the step-down power supply circuit includes a voltage stabilizer, and the voltage stabilizer reduces the input voltage to the LED lamp driving protection circuit to provide a constant power supply for the LED lamp driving protection circuit.
Optionally, the LED lamp driving protection circuit further includes an interface circuit, the interface circuit is connected to the control circuit, and the interface circuit is used for performing bidirectional data transmission between the host and the control circuit.
The utility model has the advantages that:
the utility model discloses a LED lamp drive protection circuit and lamps and lanterns, LED lamp drive protection circuit includes: the control circuit is used for receiving a control instruction sent by the host computer and sending the control instruction to the LED lamp; the constant current driving circuit is used for providing constant driving current for the LED lamp, receiving a control command issued by the control circuit and issuing the control command to the LED lamp; the voltage reduction power supply circuit is used for reducing the voltage of the mains supply and then providing power for the LED lamp driving circuit; the signal protection circuit is used for carrying out overcurrent protection and overvoltage protection on the LED lamp driving protection circuit, and comprises a self-recovery fuse, a transient suppression diode, a first resistor and a second resistor, wherein a signal input end or a signal output end of the decoding chip is connected with a first end of the first resistor through the self-recovery fuse, the self-recovery fuse is grounded through the transient suppression diode, a second end of the first resistor is connected with an output end of the voltage reduction power supply circuit through the second resistor, and a second end of the first resistor is further connected with an external port. The LED lamp driving protection circuit can provide constant power supply current for the LED lamp, and the signal protection circuit can realize automatic protection when the LED lamp generates abnormal voltage and current, so that the phenomenon that the LED lamp is damaged due to the change factors of the voltage and the current is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an LED lamp driving protection circuit according to an embodiment;
FIG. 2 is a schematic diagram of a signal protection circuit in one embodiment;
FIG. 3 is a schematic diagram of a control circuit in one embodiment;
FIG. 4 is a schematic diagram of a constant current driving circuit in one embodiment;
FIG. 5 is a schematic diagram of a buck power supply circuit in one embodiment;
FIG. 6 is a schematic diagram of an interface circuit in one embodiment;
FIG. 7 is a diagram illustrating an external port according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of an embodiment of a LED lamp driving protection circuit, in the embodiment of the utility model, referring to fig. 1, the application provides a LED lamp driving protection circuit, the LED lamp driving protection circuit includes:
the control circuit 110 is used for receiving a control instruction sent by a host computer and sending the control instruction to the LED lamp;
the constant current driving circuit 120 is configured to provide a constant driving current for the LED lamp, receive a control instruction issued by the control circuit 110, and issue the control instruction to the LED lamp;
the voltage reduction power supply circuit 130 is used for reducing the mains voltage and then providing power for the LED lamp driving circuit;
fig. 2 is a schematic diagram of an embodiment of the signal protection circuit, as shown in fig. 2, the signal input end and the signal output end of the control circuit 110 are both provided with the signal protection circuit 140, the signal protection circuit 140 includes a self-recovery fuse PT3, a transient suppression diode T5, a resistor R27, and a resistor R29, the signal input end or the signal output end of the decoding chip is connected to a first end of the resistor R27 through the self-recovery fuse PT3, the self-recovery fuse PT3 is grounded through the transient suppression diode T5, a second end of the resistor R27 is connected to a +5V power supply through the resistor R29, and a second end of the resistor R27 is further connected to an external port. Overcurrent protection is provided for the whole LED lamp driving circuit through the self-recovery fuse, and overvoltage protection is provided through the transient suppression diode T5.
Specifically, the control circuit 110, the constant current driving circuit 120, the step-down power supply circuit 130 and the signal protection circuit 140 are connected to provide a constant driving current for the LED lamp, so that the phenomenon of flickering or over-current or over-voltage damage of the LED lamp when the current or voltage is abnormal is avoided, and the control of the LED lamp is realized through the control circuit 110.
In an embodiment, the control circuit 110 includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
Specifically, fig. 3 is a schematic diagram of a control circuit in an embodiment, as shown in fig. 3, the control circuit 110110 includes a decoding chip U2 of MR-DMX05, the decoding chip U2 receives a DMX512 control signal sent by a host, decodes the control signal, and is connected to the constant current driving circuit 120 through a pin 13, 14, 16, or 17 of the decoding chip U2 to output a PWM control command for controlling an LED lamp.
In one embodiment, the constant current driving circuit 120 includes a buck converter, which provides a constant driving current for the LED lamp, and the buck converter sends a control command issued by the control circuit 110 to the LED lamp through an external port for dimming control.
Specifically, fig. 4 is a schematic diagram of a constant current driving circuit in an embodiment, and as shown in fig. 4, the constant current driving circuit 120 includes a buck converter U5 and a constant current circuit, the buck converter U5 is PAM2861, the constant current circuit constitutes a peripheral circuit of the buck converter U5, and the constant current circuit includes a first capacitor C29, a second capacitor C12, a third capacitor C13, a fourth capacitor C14, a fifth capacitor C15, a first resistor R10, a second resistor R11, an inductor L1, and a diode D4.
No. 5 pin of buck converter U5 links to each other with the power VCC, No. 5 pin of buck converter U5 still is through first electric capacity C29 ground connection, No. 5 pin of buck converter U5 still is through second electric capacity C12 ground connection, No. 5 pin of buck converter U5 still is through third electric capacity C13 ground connection, No. 5 pin of buck converter U5 still connects back No. 1 pin through the diode, No. 5 pin of buck converter U5 still connects back No. 4 pin through fourth electric capacity C14 and fifth electric capacity C15's parallelly connected back, it has inductance and external port to establish ties between No. 1 pin of buck converter U5 and No. 4 pin, the both ends of external port parallelly connected have fourth electric capacity C14 and fifth electric capacity C15.
In one embodiment, the step-down power supply circuit 130 includes a voltage regulator, which reduces the input voltage to the LED lamp driving protection circuit to provide a constant power supply for the LED lamp driving protection circuit.
Specifically, fig. 5 is a schematic diagram of a step-down power supply circuit in an embodiment, and as shown in fig. 5, the step-down power supply circuit 130130 includes an integrated voltage regulator U1 with a model number of 78L05, a fuse F1, a capacitor C28, a transformer L5, a diode D3, a transient suppression diode T1, a transient suppression diode T2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, and a capacitor C28.
The resistor R1, the resistor R2, the resistor R3, the resistor R4 and the resistor R5 are connected in parallel.
The anode of the 24V power supply is connected with the first end of a transformer L5 through a fuse F1, and the anode of the 24V power supply is connected with the cathode of the 24V power supply through a fuse F1 and a capacitor C28.
The second terminal of the transformer L5 is connected to the cathode of the 24-mode power supply, and the fourth terminal of the transformer L5 is connected to the anode of the diode D3.
The cathode of the diode D3 is connected back to the third terminal of the transformer L5 through the transient suppression diode T1, and the cathode of the diode D3 is further connected to the first terminal of the resistor R4.
The second end of the resistor R4 is connected with pin No. 3 of the integrated voltage regulator U1, the second end of the resistor R4 is also grounded through a capacitor C1, and the second end of the resistor R4 is also grounded through a capacitor C3.
The capacitor C2, the capacitor C4 and the transient suppression diode T2 are connected in parallel.
The 24V voltage is converted to 5V voltage by the step-down power supply circuit 130130, providing stable power supply for all circuits requiring +5V voltage.
In one embodiment, the LED lamp driving protection circuit further includes an interface circuit, the interface circuit is connected to the control circuit 110, and the interface circuit is used for performing bidirectional data transmission between the host and the control circuit 110.
Fig. 6 is a schematic diagram of an interface circuit in an embodiment, and as shown in fig. 6, the interface circuit includes an inductor L12, an inductor L13, a self-recovery fuse PT1, a self-recovery fuse PT2, a transient suppression diode T3, a transient suppression diode T4, a diode D1, a diode D2, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a capacitor C8, and a transceiver U3.
The first end of the resistor R20 is connected with the +5V power supply, and the second end of the resistor R20 is connected with the No. 6 pin of the transceiver U3.
No. 6 pin of the transceiver U3 is connected with an external port through the series connection of a resistor R18, a self-recovery fuse PT2 and an inductor L12, No. 7 pin of the transceiver U3 is connected with the external port through the series connection of a resistor R19, a self-recovery fuse PT1 and an inductor L13, No. 7 pin of the transceiver U3 is grounded through a resistor R2, No. 8 pin of the transceiver U3 is grounded through a capacitor C8, No. 1 pin and No. 4 pin of the transceiver U3 are connected with a decoding chip, No. 2 pin and No. 3 pin of the transceiver U3 are connected, and No. 3 pin of the transceiver U3 is grounded through a resistor R22.
The resistor R18 is grounded after being connected in parallel with the transient suppression diode T3 and the diode D1, and the resistor R19 is grounded after being connected in parallel with the transient suppression diode T4 and the diode D2.
A485 bus is formed by the transceiver U3 and a peripheral circuit thereof to be converted into a bidirectional data transmission interface circuit of a serial port of the single chip microcomputer, overcurrent protection is provided for the circuit through a self-recovery fuse PT1 and a self-recovery fuse PT2, and overvoltage protection is provided through a transient suppression diode T3 and a transient suppression diode T4.
Fig. 7 is a schematic diagram of an external port in an embodiment, and referring to fig. 7, the circuits are all connected to the LED lamp through the external port to provide a constant driving current and a control signal for the LED lamp, so as to realize regulation and control of the LED lamp, where R, G, B, W corresponds to one LED lamp respectively.
In one embodiment, the present embodiment provides a lamp including an LED lamp and an LED lamp driving protection circuit, where the LED lamp driving protection circuit includes:
the control circuit 110 is used for receiving a control instruction sent by a host computer and sending the control instruction to the LED lamp;
the constant current driving circuit 120 is configured to provide a constant driving current for the LED lamp, receive a control instruction issued by the control circuit 110, and issue the control instruction to the LED lamp;
the voltage reduction power supply circuit 130 is used for reducing the mains voltage and then providing power for the LED lamp driving circuit;
and the signal protection circuit 140 is used for performing overcurrent protection and overvoltage protection on the LED lamp driving protection circuit.
In an embodiment, the control circuit 110 includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
In one embodiment, the constant current driving circuit 120 includes a buck converter, which provides a constant driving current for the LED lamp, and the buck converter sends a control command issued by the control circuit 110 to the LED lamp through an external port for dimming control.
In one embodiment, the step-down power supply circuit 130 includes a voltage regulator, which reduces the input voltage to the LED lamp driving protection circuit to provide a constant power supply for the LED lamp driving protection circuit.
In one embodiment, the LED lamp driving protection circuit further includes an interface circuit, the interface circuit is connected to the control circuit 110, and the interface circuit is used for performing bidirectional data transmission between the host and the control circuit 110.
The utility model discloses a LED lamp drive protection circuit and lamps and lanterns, LED lamp drive protection circuit includes: the control circuit 110 is used for receiving a control instruction sent by a host computer and sending the control instruction to the LED lamp; the constant current driving circuit 120 is configured to provide a constant driving current for the LED lamp, receive a control instruction issued by the control circuit 110, and issue the control instruction to the LED lamp; the voltage reduction power supply circuit 130 is used for reducing the mains voltage and then providing power for the LED lamp driving circuit; the signal protection circuit 140 is used for performing overcurrent protection and overvoltage protection on the LED lamp driving protection circuit, the signal protection circuit 140 includes a self-recovery fuse, a transient suppression diode, a first resistor and a second resistor, the signal input end or the signal output end of the decoding chip is connected to the first end of the first resistor through the self-recovery fuse, the self-recovery fuse is grounded through the transient suppression diode, the second end of the first resistor is connected to the output end of the step-down power supply circuit 130 through the second resistor, and the second end of the first resistor is further connected to an external port. The LED lamp driving protection circuit can provide constant power supply current for the LED lamp, and the signal protection circuit 140 can realize automatic protection of the LED lamp when voltage and current are abnormal, so that the phenomenon that the LED lamp is damaged due to the change factors of the voltage and the current is avoided.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, circuit, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, circuit, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, circuit, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An LED lamp driving protection circuit, comprising:
the control circuit is used for receiving a control instruction sent by the host computer and sending the control instruction to the LED lamp;
the constant current driving circuit is used for providing constant driving current for the LED lamp, receiving a control command issued by the control circuit and issuing the control command to the LED lamp;
the voltage reduction power supply circuit is used for reducing the voltage of the mains supply and then providing power for the LED lamp driving circuit;
the signal protection circuit is used for carrying out overcurrent protection and overvoltage protection on the LED lamp driving protection circuit, and comprises a decoding chip, a self-recovery fuse, a transient suppression diode, a first resistor and a second resistor, wherein a signal input end or a signal output end of the decoding chip is connected with a first end of the first resistor through the self-recovery fuse, the self-recovery fuse is grounded through the transient suppression diode, a second end of the first resistor is connected with an output end of the voltage reduction power supply circuit through the second resistor, and a second end of the first resistor is further connected with an external port.
2. The circuit of claim 1, wherein the control circuit comprises a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs multiple PWM dimming signals.
3. The circuit of claim 1, wherein the constant current driving circuit comprises a buck converter, the buck converter provides a constant driving current for the LED lamp, and the buck converter sends a control command issued by the control circuit to the LED lamp through an external port to perform dimming control.
4. The circuit of claim 1, wherein the buck power supply circuit comprises a voltage regulator, and wherein the voltage regulator reduces an input voltage to the LED lamp driving protection circuit to provide a constant power supply for the LED lamp driving protection circuit.
5. The circuit of claim 1, wherein the LED lamp driving protection circuit further comprises an interface circuit, the interface circuit is connected to the control circuit, and the interface circuit is configured to perform bidirectional data transmission between the host and the control circuit.
6. A lamp, comprising an LED lamp and an LED lamp driving protection circuit, wherein the LED lamp driving protection circuit comprises:
the control circuit is used for receiving a control instruction sent by the host computer and sending the control instruction to the LED lamp;
the constant current driving circuit is used for providing constant driving current for the LED lamp, receiving a control command issued by the control circuit and issuing the control command to the LED lamp;
the voltage reduction power supply circuit is used for reducing the voltage of the mains supply and then providing power for the LED lamp driving circuit;
the signal protection circuit is used for carrying out overcurrent protection and overvoltage protection on the LED lamp driving protection circuit, and comprises a decoding chip, a self-recovery fuse, a transient suppression diode, a first resistor and a second resistor, wherein a signal input end or a signal output end of the decoding chip is connected with a first end of the first resistor through the self-recovery fuse, the self-recovery fuse is grounded through the transient suppression diode, a second end of the first resistor is connected with an output end of the voltage reduction power supply circuit through the second resistor, and a second end of the first resistor is further connected with an external port.
7. The lamp according to claim 6, wherein the control circuit comprises a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a plurality of PWM dimming signals.
8. The lamp as claimed in claim 6, wherein the constant current driving circuit comprises a buck converter, the buck converter provides a constant driving current for the LED lamp, and the buck converter sends a control command issued by the control circuit to the LED lamp through an external port to perform dimming control.
9. The lamp of claim 6, wherein the buck power circuit comprises a voltage regulator, and wherein the voltage regulator reduces an input voltage to the LED lamp driving protection circuit to provide a constant power supply for the LED lamp driving protection circuit.
10. The lamp of claim 6, wherein the LED lamp driving protection circuit further comprises an interface circuit, the interface circuit is connected to the control circuit, and the interface circuit is configured to perform bidirectional data transmission between the host and the control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020357868.8U CN211930928U (en) | 2020-03-19 | 2020-03-19 | LED lamp driving protection circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020357868.8U CN211930928U (en) | 2020-03-19 | 2020-03-19 | LED lamp driving protection circuit and lamp |
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| Publication Number | Publication Date |
|---|---|
| CN211930928U true CN211930928U (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020357868.8U Active CN211930928U (en) | 2020-03-19 | 2020-03-19 | LED lamp driving protection circuit and lamp |
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| CN (1) | CN211930928U (en) |
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