CN211792131U - Drive circuit and lamp - Google Patents
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- CN211792131U CN211792131U CN201922160459.9U CN201922160459U CN211792131U CN 211792131 U CN211792131 U CN 211792131U CN 201922160459 U CN201922160459 U CN 201922160459U CN 211792131 U CN211792131 U CN 211792131U
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Abstract
The utility model provides a drive circuit and lamps and lanterns. The driving circuit comprises a power acquisition unit, a constant power synchronous reference unit and a current control unit. The input end of the power acquisition unit is connected with an external power supply, a voltage signal and a current signal of the external power supply are detected to obtain a voltage detection signal and a current detection signal, and a power signal having a proportional relation with the product of the voltage detection signal and the current detection signal is output. The input end of the constant-power synchronous reference unit is connected with the input end of the power acquisition unit to generate a reference voltage signal which has the same phase as the voltage signal detected by the power acquisition unit and is fixed in amplitude. The first input end of the current control unit is connected with the output end of the power acquisition unit, the second input end of the current control unit is connected with the output end of the constant-power synchronous reference unit, the power signal of the power acquisition unit and the reference voltage signal of the constant-power synchronous reference unit are received, the power signal and the reference voltage signal are compared, and the output current is adjusted to achieve wide-voltage constant-power output.
Description
Technical Field
The utility model relates to a drive circuit technical field especially relates to a drive circuit and lamps and lanterns.
Background
The linear constant-current LED driving scheme is easy to produce and manufacture due to the simple circuit structure, is favorable for realizing a photoelectric integrated design mode, and is more and more widely applied to the fields of LED illumination and backlight. However, the conventional linear constant current LED driving scheme cannot achieve constant power output in a wide input voltage range, which causes a problem of under-power or over-power of the LED lighting system.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made to provide a driving circuit and a lamp that overcome or at least partially solve the above problems, thereby realizing a wide voltage constant power output by changing the magnitude of an output current according to a change in an external power supply voltage.
According to the utility model discloses an aspect provides drive circuit, include:
the power acquisition unit is provided with an input end and an output end, the input end of the power acquisition unit is connected with an external power supply, the power acquisition unit is configured to detect a voltage signal and a current signal of the external power supply and obtain a voltage detection signal and a current detection signal, and the output end outputs a power signal which has a proportional relation with the product of the voltage detection signal and the current detection signal;
the constant-power synchronous reference unit is provided with an input end and an output end, the input end of the constant-power synchronous reference unit is connected with the input end of the power acquisition unit, the constant-power synchronous reference unit is configured to generate a reference voltage signal which has the same phase as a voltage signal detected by the power acquisition unit and is fixed in amplitude, and the output end of the constant-power synchronous reference unit outputs the reference voltage signal; and
the current control unit is provided with a first input end, a second input end and an output end, the first input end of the current control unit is connected with the output end of the power acquisition unit, the second input end of the current control unit is connected with the output end of the constant-power synchronous reference unit, the current control unit is configured to receive a power signal output by the output end of the power acquisition unit and a reference voltage signal output by the output end of the constant-power synchronous reference unit, compare the power signal with the reference voltage signal and adjust the magnitude of current output by the output end of the current control unit according to a comparison result so as to realize wide-voltage constant-power output.
Optionally, the power collecting unit includes a current collecting module, a voltage collecting module and a multiplier;
the current acquisition module is respectively connected with the input end of the power acquisition unit and the multiplier, and is configured to detect a current signal output by the external power supply, obtain a current detection signal and output the current detection signal to the multiplier;
the voltage acquisition module is respectively connected with the input end of the power acquisition unit and the multiplier, and is configured to detect a voltage signal output by the external power supply, obtain a voltage detection signal and output the voltage detection signal to the multiplier;
the multiplier is provided with an output end and is configured to receive a current detection signal output by the current collection module and a voltage detection signal output by the voltage collection module, multiply the received voltage detection signal and the current detection signal to obtain a power signal which has a proportional relation with a product of the voltage detection signal and the current detection signal, and output the power signal by the output end of the multiplier, wherein the output end of the multiplier is used as the output end of the power collection unit.
Optionally, the constant power synchronous reference unit comprises a synchronous circuit module having an input terminal and an output terminal, and a reference voltage source having an input terminal and an output terminal;
the input end of the synchronous circuit module is used as the input end of the constant-power synchronous reference unit and is connected with the input end of the power acquisition unit, the output end of the synchronous circuit module is connected with the input end of the reference voltage source, and the synchronous circuit module is configured to acquire the phase of a voltage signal detected by the power acquisition unit and output the phase to the reference voltage source;
the output end of the reference voltage source is used as the output end of the constant-power synchronous reference unit and is connected with the second input end of the current control unit, and the reference voltage source is configured to receive the phase output by the synchronous circuit module, superpose the received phase and the reference voltage of the reference voltage source to generate a reference voltage signal with the same phase as the voltage signal detected by the power acquisition unit and output the reference voltage signal to the current control unit.
Optionally, the current control unit comprises an operational amplifier and a power switch tube;
the operational amplifier is provided with an output end, an inverting input end and a forward input end, the inverting input end of the operational amplifier is used as a first input end of the current control unit, the forward input end of the operational amplifier is used as a second input end of the current control unit, the operational amplifier is configured to receive a power signal output by the output end of the power acquisition unit and a reference voltage signal output by the output end of the constant-power synchronous reference unit, compare the power signal with the reference voltage signal and adjust a signal output by the output end of the operational amplifier according to a comparison result;
the power switch tube is connected with the output end of the operational amplifier, and the output current of the power switch tube changes along with the change of the signal output by the output end of the operational amplifier;
when the voltage of the external power supply is increased, the power signal output by the output end of the power acquisition unit is also increased, the operational amplifier compares the received power signal with the received reference voltage signal output by the constant power synchronous reference unit, the signal output by the operational amplifier is reduced, the current value flowing through the power switch tube is reduced, and the output current of the power switch tube is reduced;
when the voltage of the external power supply is reduced, the power signal output by the output end of the power acquisition unit is also reduced, the operational amplifier compares the received power signal with the received reference voltage signal output by the constant power synchronous reference unit, the signal output by the operational amplifier rises, the current value flowing through the power switch tube rises, and the output current of the power switch tube increases.
Optionally, the power switch tube is an NMOS tube, and a gate of the NMOS tube is connected to the output end of the operational amplifier.
Optionally, the driving circuit further includes:
and the rectifying unit is connected between the external power supply and the input end of the power acquisition unit.
Optionally, the rectifying unit is a bridge rectifying unit.
Optionally, the driving circuit further includes:
and the load unit is connected with the current control unit.
Optionally, the load unit is an LED light-emitting unit, and a working voltage of the LED light-emitting unit is less than a voltage of the external power supply.
According to another aspect of the present invention, there is provided a lamp including the driving circuit of any one of the above embodiments.
The embodiment of the utility model provides an among the drive circuit, the reference voltage signal of the output of the power signal of the output of current control unit received power acquisition unit and the synchronous reference cell of constant power output to compare power signal and reference voltage signal, thereby realize the constant power output of broad pressure according to the size of the electric current that the comparative result changed the current control unit output.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a driving circuit according to another embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a driving circuit according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the above technical problem, an embodiment of the present invention provides a driving circuit, and fig. 1 shows a schematic structural diagram of the driving circuit according to an embodiment of the present invention. Referring to fig. 1, the driving circuit includes a power collecting unit 10, a constant power synchronous reference unit 20, and a current control unit 30.
The power acquisition unit 10 has an input end and an output end, the input end of the power acquisition unit 10 is connected with an external power supply VAC, the power acquisition unit 10 detects a voltage signal and a current signal of the external power supply VAC and obtains a voltage detection signal and a current detection signal, and the power acquisition unit 10 outputs a power signal having a proportional relationship with a product of the voltage detection signal and the current detection signal from the output end.
The constant power synchronous reference unit 20 has an input end and an output end, the input end of the constant power synchronous reference unit 20 is connected with the input end of the power acquisition unit 10, the constant power synchronous reference unit 20 generates a reference voltage signal which has the same phase as the voltage signal detected by the power acquisition unit 10 and has a fixed amplitude, and the output end of the constant power synchronous reference unit 20 outputs the reference voltage signal.
The current control unit 30 has a first input terminal, a second input terminal and an output terminal, the first input terminal of the current control unit 30 is connected to the output terminal of the power acquisition unit 10, the second input terminal is connected to the output terminal of the constant power synchronous reference unit 20, the current control unit 30 receives a power signal output from the output terminal of the power acquisition unit 10 and a reference voltage signal output from the output terminal of the constant power synchronous reference unit 20, compares the power signal with the reference voltage signal, and adjusts the magnitude of the current output from the output terminal of the current control unit 30 according to the comparison result, thereby realizing wide-voltage constant-power output.
In this embodiment, the current control unit 30 receives the power signal output by the output terminal of the power acquisition unit 10 and the reference voltage signal output by the output terminal of the constant power synchronous reference unit 20, compares the power signal with the reference voltage signal, and changes the magnitude of the current output by the current control unit 30 according to the comparison result, so that even if the voltage signal (the voltage signal at the input terminal of the power acquisition unit 10) detected by the power acquisition unit 10 is increased or decreased, the current control unit 30 can still ensure to output constant power, thereby avoiding the problem of over-power or under-power.
Referring to fig. 2, in an embodiment of the present invention, the power collecting unit 10 includes a current collecting module 11, a voltage collecting module 12, and a multiplier 13.
The current collection module 11 is respectively connected with the input end of the power collection unit 10 and the multiplier 13, the current collection module 11 detects a current signal output by an external power supply VAC and obtains a current detection signal, and the current collection module 11 outputs the current detection signal to the multiplier 13.
The voltage acquisition module 12 is connected with the input end of the power acquisition unit 10 and the multiplier 13 respectively, the voltage acquisition module 12 detects a voltage signal output by an external power supply VAC and obtains a voltage detection signal, and the voltage acquisition module 12 outputs the voltage detection signal to the multiplier 13.
The multiplier 13 has an output end, the multiplier 13 receives the current detection signal output by the current collection module 11 and the voltage detection signal output by the voltage collection module 12, multiplies the received voltage detection signal and the current detection signal to obtain a power signal having a proportional relation with a product of the voltage detection signal and the current detection signal, and outputs the power signal from the output end of the multiplier 13, wherein the output end of the multiplier 13 serves as the output end of the power collection unit 10.
In this embodiment, the current detection signal output by the current collection module 11 received by the multiplier 13 may be a current detection signal Iin, the voltage detection signal output by the voltage collection module 12 received may be a voltage detection signal Vin, the power signal Pvin after operation is the current detection signal Iin voltage detection signal Vin K, K is an operation coefficient of the multiplier 13, and the value of K may be set according to the actual application requirement, which is not specifically limited by the embodiment of the present invention. The multiplier 13 outputs the power signal Pvin to a first input terminal of the current control unit 30.
In this embodiment, the current collecting module 11 may process the detected current signal according to the actual application requirement to obtain a current detection signal, and the voltage collecting module 12 may process the detected voltage signal according to the actual application requirement to obtain a voltage detection signal. For example, the current collecting module 11 may enlarge or reduce the detected current signal according to the actual application requirement to obtain a current detection signal, and the voltage collecting module 12 may enlarge or reduce the detected voltage signal according to the actual application requirement to obtain a voltage detection signal. The current collection module 11 can be current transformer, certainly can also be for other that technical staff in this field mastered can detect the current signal of external power supply VAC output and obtain other equipment of current detection signal, the embodiment of the utility model provides a do not do specific restriction to this. Voltage acquisition module 12 can be voltage transformer, still can be for other that technical personnel in the field mastered can detect the voltage signal of external power supply VAC output and obtain voltage detection signal's other equipment equally, the embodiment of the utility model provides a do not do specific restriction to this.
With continued reference to fig. 2, in an embodiment of the present invention, the constant power synchronous reference cell 20 includes a synchronous circuit module 21 having an input and an output and a reference voltage source 22 having an input and an output.
The input end of the synchronous circuit module 21 is used as the input end of the constant power synchronous reference unit 20 and connected with the input end of the power acquisition unit 10, the output end of the synchronous circuit module 21 is connected with the input end of the reference voltage source 22, and the synchronous circuit module 21 acquires the phase of the voltage signal detected by the power acquisition unit 10 and outputs the phase to the reference voltage source 22.
The output end of the reference voltage source 22 is connected to the second input end of the current control unit 30 as the output end of the constant power synchronous reference unit 20, and the reference voltage source 22 receives the phase output by the synchronous circuit module 21, superposes the received phase and the reference voltage of the reference voltage source 22 to generate a reference voltage signal Pref having the same phase as the voltage signal detected by the power acquisition unit 10, and outputs the reference voltage signal Pref to the current control unit 30.
In this embodiment, for example, if the external power supply VAC is an external power supply VAC of a sinusoidal ac voltage, the reference voltage signal Pref output by the reference voltage source 22 is Vref × sin (2 pi ft), the function sin (2 pi ft) is a sine value corresponding to a different phase (the phase of the voltage signal detected by the power acquisition unit 10), f is the frequency of the external power supply VAC, t is the time axis in the frequency domain of the sinusoidal signal, and Vref is the reference voltage value of the reference voltage source 22.
In an embodiment of the present invention, the current control unit 30 includes an operational amplifier 31 and a power switch 32.
The operational amplifier 31 has an output terminal, an inverting input terminal and a forward input terminal, the inverting input terminal of the operational amplifier 31 is used as a first input terminal of the current control unit 30, the forward input terminal of the operational amplifier 31 is used as a second input terminal of the current control unit 30, the operational amplifier 31 receives the power signal output by the output terminal of the power acquisition unit 10 and the reference voltage signal output by the output terminal of the constant power synchronous reference unit 20, compares the power signal with the reference voltage signal, and adjusts the signal output by the output terminal of the operational amplifier 31 according to the comparison result. The power switch 32 is connected to the output terminal of the operational amplifier 31, and the output current of the power switch 32 changes with the change of the signal output from the output terminal of the operational amplifier 31.
Specifically, when the voltage of the external power supply VAC increases, the power signal Pvin (the power signal output by the power acquisition unit 10 from the output end) output by the multiplier 13 also increases, the operational amplifier 31 compares the received power signal Pvin with the received reference voltage signal Pref (the reference voltage signal which is output by the output end of the constant power synchronous reference unit 20 and has the same phase as the voltage detection signal acquired by the power acquisition unit 10 and has a fixed amplitude) output by the reference voltage source 22, at this time, the signal output by the operational amplifier 31 decreases, the current value flowing through the power switch tube 32 decreases, and thus the output current of the power switch tube 32 decreases; when the voltage of the external power supply VAC decreases, the power signal Pvin output by the multiplier 13 also decreases, and the operational amplifier 31 compares the received power signal Pvin with the received reference voltage signal Pref output by the reference voltage source 22, at this time, the signal output by the operational amplifier 31 increases, the value of the current flowing through the power switch tube 32 increases, and the output current of the power switch tube 32 increases, so that the wide-voltage constant power output can be realized.
In an embodiment of the present invention, the power switch 32 is an NMOS transistor, and the gate of the NMOS transistor is connected to the output terminal of the operational amplifier 31.
Referring to fig. 2 and 3, in an embodiment of the present invention, the driving circuit further includes a rectifying unit 50, and the rectifying unit 50 is connected between the external power VAC and the input terminal of the power collecting unit 10. Specifically, the input end of the power acquisition unit 10 is connected to the rectification unit 50, the power acquisition unit 10 detects a voltage signal and a current signal output by the external power VAC after being rectified by the rectification unit 50 and obtains a current detection signal and a voltage detection signal, and performs multiplication operation on the acquired voltage detection signal and current detection signal to obtain a power signal having a proportional relationship with the product of the acquired voltage detection signal and current detection signal, and the power signal is output from the output end. The constant power synchronous reference unit 20 generates a reference voltage signal having the same phase as the voltage signal detected by the power acquisition unit 10 and a fixed amplitude, and outputs the reference voltage signal from the output terminal of the constant power synchronous reference unit 20.
In an embodiment of the present invention, the rectifying unit 50 may be a bridge rectifying unit 50, and specifically, the bridge rectifying unit 50 may be a full bridge rectifying unit, such as a bridge stack. Of course, the rectifying unit 50 may also be other types of rectifying units, and the embodiment of the present invention does not specifically limit this.
In an embodiment of the present invention, the driving circuit further includes a load unit 40, and the load unit 40 is connected to the current control unit 30.
In an embodiment of the present invention, the load unit 40 may be an LED light emitting unit, and the operating voltage of the LED light emitting unit is less than the voltage of the external power supply VAC. The LED light-emitting unit can be fully driven to work under the condition of wider input voltage by enabling the working voltage (maximum working voltage) of the LED light-emitting unit to be smaller than the voltage of an external power supply VAC. The difference of external power supply VAC's voltage and the maximum operating voltage of LED luminescence unit can be set for according to actual demand, and for example the difference can be for 40V ~ 50V, the embodiment of the utility model provides a do not do specific injecing to this. The LED light emitting unit may include at least one light emitting diode, a cathode of the light emitting diode is connected to the current control unit 30 (a drain of the NMOS transistor is connected), and an anode of the light emitting diode is connected to the current collecting module 11. The driving circuit can avoid the problem of under-power or over-power of the LED light-emitting unit by realizing wide-voltage constant-power output, thereby prolonging the service life of the LED light-emitting unit.
Based on same design, the embodiment of the utility model provides a still provides a lamps and lanterns, and this lamps and lanterns are provided with the drive circuit that any embodiment of the above introduced. The lamp can be a bulb lamp, a tube spotlight, a panel lamp, a projection lamp, a fresh lamp or a street lamp and the like. In the working process of the lamp, the problem of under power or over power can be avoided, so that the service life of the lamp is prolonged.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principles of the present invention; such modifications and substitutions do not depart from the scope of the present invention.
Claims (10)
1. A driver circuit, comprising:
the power acquisition unit is provided with an input end and an output end, the input end of the power acquisition unit is connected with an external power supply, the power acquisition unit is configured to detect a voltage signal and a current signal of the external power supply and obtain a voltage detection signal and a current detection signal, and the output end outputs a power signal which has a proportional relation with the product of the voltage detection signal and the current detection signal;
the constant-power synchronous reference unit is provided with an input end and an output end, the input end of the constant-power synchronous reference unit is connected with the input end of the power acquisition unit, the constant-power synchronous reference unit is configured to generate a reference voltage signal which has the same phase as a voltage signal detected by the power acquisition unit and is fixed in amplitude, and the output end of the constant-power synchronous reference unit outputs the reference voltage signal; and
the current control unit is provided with a first input end, a second input end and an output end, the first input end of the current control unit is connected with the output end of the power acquisition unit, the second input end of the current control unit is connected with the output end of the constant-power synchronous reference unit, the current control unit is configured to receive a power signal output by the output end of the power acquisition unit and a reference voltage signal output by the output end of the constant-power synchronous reference unit, compare the power signal with the reference voltage signal and adjust the magnitude of current output by the output end of the current control unit according to a comparison result so as to realize wide-voltage constant-power output.
2. The driving circuit according to claim 1, wherein the power collecting unit comprises a current collecting module, a voltage collecting module and a multiplier;
the current acquisition module is respectively connected with the input end of the power acquisition unit and the multiplier, and is configured to detect a current signal output by the external power supply, obtain a current detection signal and output the current detection signal to the multiplier;
the voltage acquisition module is respectively connected with the input end of the power acquisition unit and the multiplier, and is configured to detect a voltage signal output by the external power supply, obtain a voltage detection signal and output the voltage detection signal to the multiplier;
the multiplier is provided with an output end and is configured to receive a current detection signal output by the current collection module and a voltage detection signal output by the voltage collection module, multiply the received voltage detection signal and the current detection signal to obtain a power signal which has a proportional relation with a product of the voltage detection signal and the current detection signal, and output the power signal by the output end of the multiplier, wherein the output end of the multiplier is used as the output end of the power collection unit.
3. The driving circuit of claim 1, wherein the constant power synchronous reference unit comprises a synchronous circuit module having an input terminal and an output terminal, and a reference voltage source having an input terminal and an output terminal;
the input end of the synchronous circuit module is used as the input end of the constant-power synchronous reference unit and is connected with the input end of the power acquisition unit, the output end of the synchronous circuit module is connected with the input end of the reference voltage source, and the synchronous circuit module is configured to acquire the phase of a voltage signal detected by the power acquisition unit and output the phase to the reference voltage source;
the output end of the reference voltage source is used as the output end of the constant-power synchronous reference unit and is connected with the second input end of the current control unit, and the reference voltage source is configured to receive the phase output by the synchronous circuit module, superpose the received phase and the reference voltage of the reference voltage source to generate a reference voltage signal with the same phase as the voltage signal detected by the power acquisition unit and output the reference voltage signal to the current control unit.
4. The driving circuit according to claim 1, wherein the current control unit comprises an operational amplifier and a power switch tube;
the operational amplifier is provided with an output end, an inverting input end and a forward input end, the inverting input end of the operational amplifier is used as a first input end of the current control unit, the forward input end of the operational amplifier is used as a second input end of the current control unit, the operational amplifier is configured to receive a power signal output by the output end of the power acquisition unit and a reference voltage signal output by the output end of the constant-power synchronous reference unit, compare the power signal with the reference voltage signal and adjust a signal output by the output end of the operational amplifier according to a comparison result;
the power switch tube is connected with the output end of the operational amplifier, and the output current of the power switch tube changes along with the change of the signal output by the output end of the operational amplifier;
when the voltage of the external power supply is increased, the power signal output by the output end of the power acquisition unit is also increased, the operational amplifier compares the received power signal with the received reference voltage signal output by the constant power synchronous reference unit, the signal output by the operational amplifier is reduced, the current value flowing through the power switch tube is reduced, and the output current of the power switch tube is reduced;
when the voltage of the external power supply is reduced, the power signal output by the output end of the power acquisition unit is also reduced, the operational amplifier compares the received power signal with the received reference voltage signal output by the constant power synchronous reference unit, the signal output by the operational amplifier rises, the current value flowing through the power switch tube rises, and the output current of the power switch tube increases.
5. The driving circuit of claim 4, wherein the power switch tube is an NMOS tube, and a gate of the NMOS tube is connected to the output terminal of the operational amplifier.
6. The driving circuit according to claim 1, further comprising:
and the rectifying unit is connected between the external power supply and the input end of the power acquisition unit.
7. The driving circuit according to claim 6, wherein the rectifying unit is a bridge rectifying unit.
8. The driving circuit according to claim 1, further comprising:
and the load unit is connected with the current control unit.
9. The driving circuit according to claim 8, wherein the load unit is an LED light-emitting unit, and an operating voltage of the LED light-emitting unit is lower than a voltage of the external power supply.
10. A luminaire comprising a driver circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922160459.9U CN211792131U (en) | 2019-12-05 | 2019-12-05 | Drive circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922160459.9U CN211792131U (en) | 2019-12-05 | 2019-12-05 | Drive circuit and lamp |
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| CN211792131U true CN211792131U (en) | 2020-10-27 |
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