CN216721638U - Silicon controlled rectifier dimming circuit and lamp - Google Patents
Silicon controlled rectifier dimming circuit and lamp Download PDFInfo
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- CN216721638U CN216721638U CN202123361116.2U CN202123361116U CN216721638U CN 216721638 U CN216721638 U CN 216721638U CN 202123361116 U CN202123361116 U CN 202123361116U CN 216721638 U CN216721638 U CN 216721638U
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Abstract
The application provides a silicon controlled rectifier dimmer circuit and lamps and lanterns. The silicon controlled dimming circuit comprises a rectifier, a maintaining circuit and a dimming output circuit; the maintaining circuit comprises a first electronic switching tube, a second electronic switching tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, wherein the control end of the first electronic switching tube is also connected with the second end of the second electronic switching tube, and the first end of the first electronic switching tube is connected with the control end of the second electronic switching tube; the first end of the second electronic switching tube is connected with the output end of the rectifier, and the second end of the second electronic switching tube is grounded through a third resistor. Under the low-voltage condition, first electron switch tube switches on once more, and second electron switch tube ends once more to make the electric current increase of the input of the output circuit of adjusting luminance, so that with the electric current recovery of the input of the output circuit of adjusting luminance to the electric current before the low-voltage, improved silicon controlled rectifier dimming circuit's light-emitting stability.
Description
Technical Field
The utility model relates to the technical field of lamp dimming, in particular to a silicon controlled rectifier dimming circuit and a lamp.
Background
Along with the rapid development of the electric control lamp, the dimming circuit based on the silicon controlled switch is used for adjusting the light emitting mode and the intensity of the lamp, so that various electric control lamps have different light working modes, the change of the light emitting mode is realized, and different light emitting requirements are met.
However, the input end of the conventional electric control lamp is connected to the ac power grid and is easily fluctuated by the power grid, for example, the voltage signal output by the ac power grid has ripples at the trough, that is, pulse signals with different frequencies, resulting in poor stability of light emission.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a silicon controlled rectifier dimming circuit and a lamp for improving light emitting stability.
The purpose of the utility model is realized by the following technical scheme:
a thyristor dimmer circuit, comprising: a rectifier, a holding circuit and a dimming output circuit; the input end of the rectifier is used for being connected with an external alternating current power supply; the maintaining circuit comprises a first electronic switching tube, a second electronic switching tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the output end of the rectifier is connected with the control end of the first electronic switching tube through the first resistor, the control end of the first electronic switching tube is also connected with the second end of the second electronic switching tube, the first end of the first electronic switching tube is connected with the control end of the second electronic switching tube, and the second end of the first electronic switching tube is grounded; the output end of the rectifier is further connected with the control end of the second electronic switching tube through the second resistor, the first end of the second electronic switching tube is connected with the output end of the rectifier, and the second end of the second electronic switching tube is grounded through the third resistor; the output end of the rectifier is also connected with the first end of the fifth resistor through the fourth resistor, and the second end of the fifth resistor is grounded; the first end of the fifth resistor is connected with the input end of the dimming output circuit, and the output end of the dimming output circuit is used for being connected with the light-operated main board of the light source so as to control the light-emitting intensity of each light source.
In one embodiment, the maintaining circuit further includes a sixth resistor, the control terminal of the first electronic switching tube is connected to a first terminal of the sixth resistor, and a second terminal of the sixth resistor is grounded.
In one embodiment, the maintaining circuit further includes a first capacitor, a first end of the sixth resistor is connected to a first end of the first capacitor, and a second end of the first capacitor is connected to a second end of the second electronic switch tube.
In one embodiment, the maintaining circuit further includes a current-steering diode, the second terminal of the second electronic switching tube is connected to the anode of the current-steering diode, and the cathode of the current-steering diode is connected to the first terminal of the first capacitor.
In one embodiment, the sustain circuit further comprises a second capacitor, a first terminal of the fifth resistor is connected to a first terminal of the second capacitor, and a second terminal of the second capacitor is grounded.
In one embodiment, the sustain circuit further includes a seventh resistor, a first end of the fifth resistor is connected to a first end of the seventh resistor, a second end of the seventh resistor is grounded, and a resistance of the seventh resistor is greater than a resistance of the fifth resistor.
In one embodiment, the maintaining circuit further includes a third capacitor and an eighth resistor, a first end of the fifth resistor is grounded through the third capacitor, a second end of the fifth resistor is further connected to a first end of the eighth resistor, and a second end of the eighth resistor is connected to the input terminal of the dimming output circuit.
In one embodiment, the sustain circuit further includes a fourth capacitor and a ninth resistor, a second end of the eighth resistor is grounded through the fourth capacitor, and a second end of the eighth resistor is further connected to the input terminal of the dimming output circuit through the ninth resistor.
In one embodiment, the dimming output circuit includes a thyristor pulse modulator and an optical coupler, the first end of the fifth resistor is connected to the input end of the thyristor pulse modulator, the thyristor pulse modulator is configured to output a pulse width modulation signal, the output end of the thyristor pulse modulator is connected to the input end of the optical coupler, and the output end of the optical coupler is configured to output a modulated pulse dimming signal.
A lamp comprises the silicon controlled rectifier dimming circuit in any one of the embodiments.
Compared with the prior art, the utility model has at least the following advantages:
under the low-voltage condition, first electronic switch tube is turned into by switching on and ends, second electronic switch tube is turned on by cutting off and changing into, the voltage increase of the first end of third resistance this moment, the voltage that leads to the control end of first electronic switch tube rises, make first electronic switch tube switch on once more, second electronic switch tube cuts off once more, thereby make the current increase of the input of output circuit that adjusts luminance, so that resume the current before the low-voltage with the current of output circuit's input of adjusting luminance, thereby the output current stability of silicon controlled rectifier dimming circuit has been improved, and then silicon controlled rectifier dimming circuit's light-emitting stability has been improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a circuit diagram of an embodiment of a thyristor dimmer circuit;
FIG. 2 is a circuit diagram of a keeper circuit of the SCR dimmer circuit of FIG. 1;
fig. 3 is a circuit diagram of a dimming output circuit of the thyristor dimming circuit shown in fig. 1.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model relates to a silicon controlled rectifier dimming circuit. In one embodiment, the thyristor dimming circuit includes a rectifier, a keeper circuit, and a dimming output circuit. And the input end of the rectifier is used for being connected with an external alternating current power supply. The maintaining circuit comprises a first electronic switching tube, a second electronic switching tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor. The output end of the rectifier is connected with the control end of the first electronic switching tube through the first resistor. The control end of the first electronic switch tube is also connected with the second end of the second electronic switch tube, the first end of the first electronic switch tube is connected with the control end of the second electronic switch tube, and the second end of the first electronic switch tube is grounded. The output end of the rectifier is also connected with the control end of the second electronic switching tube through the second resistor. The first end of the second electronic switching tube is connected with the output end of the rectifier, and the second end of the second electronic switching tube is grounded through the third resistor. The output end of the rectifier is further connected with the first end of the fifth resistor through the fourth resistor. A second end of the fifth resistor is grounded; and the first end of the fifth resistor is connected with the input end of the dimming output circuit. The output end of the dimming output circuit is used for being connected with the light-operated main board of the light source so as to control the light-emitting intensity of each light source. Under the low-voltage condition, first electronic switch tube is turned into by switching on and ends, second electronic switch tube is turned on by cutting off and changing into, the voltage increase of the first end of third resistance this moment, the voltage that leads to the control end of first electronic switch tube rises, make first electronic switch tube switch on once more, second electronic switch tube cuts off once more, thereby make the current increase of the input of output circuit that adjusts luminance, so that resume the current before the low-voltage with the current of output circuit's input of adjusting luminance, thereby the output current stability of silicon controlled rectifier dimming circuit has been improved, and then silicon controlled rectifier dimming circuit's light-emitting stability has been improved.
Fig. 1 is a circuit diagram of a thyristor dimming circuit according to an embodiment of the utility model.
The scr dimming circuit 10 of an embodiment includes a rectifier BD1, a keeper circuit 100, and a dimming output circuit 200. The input end of the rectifier BD1 is used for connecting with an external alternating current power supply. Referring to fig. 2, the sustain circuit 100 includes a first electronic switch Q1, a second electronic switch Q2, a first resistor R3, a second resistor R5, a third resistor R6, a fourth resistor R9, and a fifth resistor R7. The output end of the rectifier BD1 is connected to the control end of the first electronic switching tube Q1 through the first resistor R3. The control end of the first electronic switch tube Q1 is further connected to the second end of the second electronic switch tube Q2, the first end of the first electronic switch tube Q1 is connected to the control end of the second electronic switch tube Q2, and the second end of the first electronic switch tube Q1 is grounded. The output end of the rectifier BD1 is further connected to the control end of the second electronic switching tube Q2 through the second resistor R5. The first end of the second electronic switching tube Q2 is connected to the output end of the rectifier BD1, and the second end of the second electronic switching tube Q2 is grounded through the third resistor R6. The output end of the rectifier BD1 is also connected to the first end of the fifth resistor R7 through the fourth resistor R9. A second end of the fifth resistor R7 is grounded; a first end of the fifth resistor R7 is connected to the input end of the dimming output circuit 200. The output end of the dimming output circuit 200 is used for being connected with the light-operated main board of the light source to control the light-emitting intensity of each light source.
In this embodiment, under the condition of low voltage, the first electronic switching tube Q1 is turned from on to off, the second electronic switching tube Q2 is turned from off to on, at this time, the voltage of the first end of the third resistor R6 is increased, which causes the voltage of the control end of the first electronic switching tube Q1 to rise, so that the first electronic switching tube Q1 is turned on again, the second electronic switching tube Q2 is turned off again, so that the current at the input end of the dimming output circuit 200 is increased, so that the current at the input end of the dimming output circuit 200 is restored to the current before the low power, thereby improving the output current stability of the thyristor dimming circuit, and further improving the light-emitting stability of the thyristor dimming circuit. The first electronic switching tube Q1 is an N-type triode, the first end of the first electronic switching tube Q1 is a collector of the N-type triode, the second end of the first electronic switching tube Q1 is an emitter of the N-type triode, and the control end of the first electronic switching tube Q1 is a base of the N-type triode; the second electronic switch tube Q2 is an N-type field effect transistor, the first end of the second electronic switch tube Q2 is the drain electrode of the N-type field effect transistor, the second end of the second electronic switch tube Q2 is the source electrode of the N-type field effect transistor, and the control end of the second electronic switch tube Q2 is the gate electrode of the N-type field effect transistor.
In one embodiment, referring to fig. 2, the sustain circuit 100 further includes a sixth resistor R1, the control terminal of the first electronic switch Q1 is connected to the first terminal of the sixth resistor R1, and the second terminal of the sixth resistor R1 is grounded. In this embodiment, the sixth resistor R1 is connected in parallel to the first electronic switch tube Q1, that is, the sixth resistor R1 is connected in parallel to the control end and the second end of the first electronic switch tube Q1, the control end of the first electronic switch tube Q1 is used as a switch-on end of the first electronic switch tube Q1 for switching on or off the first electronic switch tube Q1, the second end of the first electronic switch tube Q1 is used as a ground end of the first electronic switch tube Q1, so that the sixth resistor R1 is connected in series with the first resistor R3, and the first end of the sixth resistor R1 is connected to the control end of the first electronic switch tube Q1, so as to raise the voltage at the control end of the first electronic switch tube Q1, thereby opening the first electronic switch tube Q1. The sixth resistor R1 is a pull-up resistor of the control terminal of the first electronic switch Q1, so that the voltage of the control terminal of the first electronic switch Q1 is increased, so as to turn on the first electronic switch Q1 more quickly.
Further, referring to fig. 2, the sustain circuit 100 further includes a first capacitor C1, a first end of the sixth resistor R1 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is connected to a second end of the second electronic switch Q2. In this embodiment, a first end of the first capacitor C1 is connected to the control end of the first electronic switch Q1, and a second end of the first capacitor C1 is connected to a second end of the second electronic switch Q2, so that the first capacitor C1 is located between the first electronic switch Q1 and the second electronic switch Q2. When the power is normally supplied, the first electronic switch is in a conducting state, and at this time, the first capacitor C1 is charged, so that part of interference signals are guided to the ground through the third resistor R6, the stability of signals input to the control end of the first electronic switch Q1 is improved, and the interference to the control end of the first electronic switch Q1 is reduced.
Further, referring to fig. 2, the sustain circuit 100 further includes a steering diode D1, a second terminal of the second electronic switch Q2 is connected to an anode of the steering diode D1, and a cathode of the steering diode D1 is connected to a first terminal of the first capacitor C1. In this embodiment, when the second electronic switch Q2 is turned on from off, the current output from the second terminal of the second electronic switch Q2 is guided to the control terminal of the first electronic switch Q1 through the steering diode D1, so that the current output from the second terminal of the second electronic switch Q2 is fed back to the control terminal of the first electronic switch Q1, and thus the feedback signal of the second electronic switch Q2 is smoothly derived, and the feedback control of the control terminal of the first electronic switch Q1 is realized.
In one embodiment, referring to fig. 2, the sustain circuit 100 further includes a second capacitor E1, the first terminal of the fifth resistor R7 is connected to the first terminal of the second capacitor E1, and the second terminal of the second capacitor E1 is grounded. In this embodiment, the second capacitor E1 is an electrolytic capacitor, the second capacitor E1 charges and filters during operation, and when the external ac power source outputs a normal voltage, the second capacitor E1 is charged and simultaneously filters a signal of the dimming output circuit 200. When the power is low, the second capacitor E1 supplies power to the input terminal of the dimming output circuit 200 to ensure that the voltage at the input terminal of the dimming output circuit 200 is stable, so as to reduce the voltage drop speed at the input terminal of the dimming output circuit 200, and to stabilize the voltage at the input terminal of the dimming output circuit 200.
Further, referring to fig. 2, the sustain circuit 100 further includes a seventh resistor R10, a first end of the fifth resistor R7 is connected to a first end of the seventh resistor R10, a second end of the seventh resistor R10 is grounded, and a resistance of the seventh resistor R10 is greater than a resistance of the fifth resistor R7. In this embodiment, the seventh resistor R10 is connected in parallel with the fifth resistor R7, and the seventh resistor R10 shunts the current of the fifth resistor R7, so that the input resistance of the dimming output circuit 200 is reduced, the input current of the dimming output circuit 200 is effectively increased, and the input signal is conveniently acquired by the input terminal of the dimming output circuit 200. In another embodiment, the ratio of the resistance of the seventh resistor R10 to the resistance of the fifth resistor R7 is 5.8 to 7.2, for example, the resistance of the seventh resistor R10 is 47K Ω, and the resistance of the fifth resistor R7 is 6.8K Ω.
In one embodiment, referring to fig. 2, the sustain circuit 100 further includes a third capacitor C3 and an eighth resistor R12, a first end of the fifth resistor R7 is grounded through the third capacitor C3, a second end of the fifth resistor R7 is further connected to a first end of the eighth resistor R12, and a second end of the eighth resistor R12 is connected to the input end of the dimming output circuit 200. In this embodiment, the third capacitor C3 and the eighth resistor R12 form a low-pass filter circuit, and the third capacitor C3 filters a voltage signal higher than a cut-off frequency, that is, allows a low-frequency signal lower than the cut-off frequency to pass through, and inputs the low-frequency signal to the input terminal of the dimming output circuit 200, so as to perform a primary filtering on the input signal of the dimming output circuit 200, thereby improving the stability of the input signal of the dimming output circuit 200.
Further, referring to fig. 2, the sustain circuit 100 further includes a fourth capacitor C4 and a ninth resistor R14, a second end of the eighth resistor R12 is grounded through the fourth capacitor C4, and a second end of the eighth resistor R12 is further connected to the input end of the dimming output circuit 200 through the ninth resistor R14. In this embodiment, the fourth capacitor C4 and the ninth resistor R14 form another low-pass filter circuit, and the cut-off frequency of this low-pass filter circuit is different from the cut-off frequency of the low-pass filter circuit formed by the third capacitor C3 and the eighth resistor R12, so as to filter out different high-frequency signals, so that the stability of the input signal of the dimming output circuit 200 is further improved.
In one embodiment, referring to fig. 3, the dimming output circuit 200 includes a thyristor pulse modulator U2 and an optical coupler U3, a first end of the fifth resistor R7 is connected to an input end of the thyristor pulse modulator U2, the thyristor pulse modulator U2 is configured to output a pulse width modulation signal, an output end of the thyristor pulse modulator U2 is connected to an input end of the optical coupler U3, and an output end of the optical coupler U3 is configured to output a modulated pulse dimming signal. In this embodiment, the scr pulse modulator U2 converts an input analog signal, a signal at an input end of the scr pulse modulator U2 is an analog signal, and a signal at an output end of the scr pulse modulator U2 is a digital signal, for example, the scr pulse modulator U2 outputs a pulse width modulation signal, that is, the scr pulse modulator U2 outputs a PWM signal, so that the input end of the optical coupler U3 receives a stable digital signal. The optical coupler U3 isolates the silicon controlled rectifier pulse modulator U2 from an external circuit, and the interference of the external circuit to the silicon controlled rectifier pulse modulator U2 is reduced, so that the ionization interference of a light source light control mainboard and each light source to the silicon controlled rectifier pulse modulator U2 is reduced.
In one embodiment, the present application further provides a lamp including the thyristor dimming circuit according to any one of the above embodiments. In this embodiment, the scr dimming circuit includes a rectifier, a keeper circuit, and a dimming output circuit. And the input end of the rectifier is used for being connected with an external alternating current power supply. The maintaining circuit comprises a first electronic switching tube, a second electronic switching tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor. The output end of the rectifier is connected with the control end of the first electronic switching tube through the first resistor. The control end of the first electronic switch tube is further connected with the second end of the second electronic switch tube, the first end of the first electronic switch tube is connected with the control end of the second electronic switch tube, and the second end of the first electronic switch tube is grounded. The output end of the rectifier is also connected with the control end of the second electronic switching tube through the second resistor. The first end of the second electronic switching tube is connected with the output end of the rectifier, and the second end of the second electronic switching tube is grounded through the third resistor. The output end of the rectifier is further connected with the first end of the fifth resistor through the fourth resistor. A second end of the fifth resistor is grounded; and the first end of the fifth resistor is connected with the input end of the dimming output circuit. The output end of the dimming output circuit is used for being connected with the light-operated main board of the light source so as to control the light-emitting intensity of each light source. Under the low-voltage condition, first electronic switch tube is turned into by switching on and ends, second electronic switch tube is turned on by cutting off and changing into, the voltage increase of the first end of third resistance this moment, the voltage that leads to the control end of first electronic switch tube rises, make first electronic switch tube switch on once more, second electronic switch tube cuts off once more, thereby make the current increase of the input of output circuit that adjusts luminance, so that resume the current before the low-voltage with the current of output circuit's input of adjusting luminance, thereby the output current stability of silicon controlled rectifier dimming circuit has been improved, and then silicon controlled rectifier dimming circuit's light-emitting stability has been improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A thyristor dimmer circuit, comprising:
the input end of the rectifier is used for being connected with an external alternating current power supply;
the maintaining circuit comprises a first electronic switching tube, a second electronic switching tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, wherein the output end of the rectifier is connected with the control end of the first electronic switching tube through the first resistor, the control end of the first electronic switching tube is also connected with the second end of the second electronic switching tube, the first end of the first electronic switching tube is connected with the control end of the second electronic switching tube, and the second end of the first electronic switching tube is grounded; the output end of the rectifier is further connected with the control end of the second electronic switching tube through the second resistor, the first end of the second electronic switching tube is connected with the output end of the rectifier, and the second end of the second electronic switching tube is grounded through the third resistor; the output end of the rectifier is also connected with the first end of the fifth resistor through the fourth resistor, and the second end of the fifth resistor is grounded;
and the first end of the fifth resistor is connected with the input end of the dimming output circuit, and the output end of the dimming output circuit is connected with the light-operated main board of the light source to control the light-emitting intensity of each light source.
2. The triac dimming circuit of claim 1, wherein the maintaining circuit further comprises a sixth resistor, the control terminal of the first electronic switch tube is connected to a first terminal of the sixth resistor, and a second terminal of the sixth resistor is grounded.
3. The triac dimming circuit of claim 2, wherein said maintaining circuit further comprises a first capacitor, a first terminal of said sixth resistor is connected to a first terminal of said first capacitor, and a second terminal of said first capacitor is connected to a second terminal of said second electronic switching tube.
4. The triac dimming circuit of claim 3, wherein the maintaining circuit further comprises a current-steering diode, the second terminal of the second electronic switching tube is connected to the positive terminal of the current-steering diode, and the negative terminal of the current-steering diode is connected to the first terminal of the first capacitor.
5. The triac dimming circuit of claim 1, wherein said maintaining circuit further comprises a second capacitor, a first terminal of said fifth resistor is connected to a first terminal of said second capacitor, and a second terminal of said second capacitor is connected to ground.
6. The triac dimmer circuit as claimed in claim 5, wherein said holding circuit further comprises a seventh resistor, a first end of said fifth resistor is connected to a first end of said seventh resistor, a second end of said seventh resistor is connected to ground, and a resistance of said seventh resistor is greater than a resistance of said fifth resistor.
7. The scr dimming circuit of claim 1, wherein the maintaining circuit further comprises a third capacitor and an eighth resistor, a first terminal of the fifth resistor is connected to ground through the third capacitor, a second terminal of the fifth resistor is further connected to a first terminal of the eighth resistor, and a second terminal of the eighth resistor is connected to the input terminal of the dimming output circuit.
8. The triac dimming circuit of claim 7, wherein said maintaining circuit further comprises a fourth capacitor and a ninth resistor, a second terminal of said eighth resistor is connected to ground through said fourth capacitor, and a second terminal of said eighth resistor is further connected to said input terminal of said dimming output circuit through said ninth resistor.
9. The thyristor dimming circuit of claim 1, wherein the dimming output circuit comprises a thyristor pulse modulator and an optical coupler, the first end of the fifth resistor is connected to the input end of the thyristor pulse modulator, the thyristor pulse modulator is configured to output a pulse width modulation signal, the output end of the thyristor pulse modulator is connected to the input end of the optical coupler, and the output end of the optical coupler is configured to output a modulated pulse dimming signal.
10. A lamp comprising a thyristor dimmer circuit as defined in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123361116.2U CN216721638U (en) | 2021-12-28 | 2021-12-28 | Silicon controlled rectifier dimming circuit and lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123361116.2U CN216721638U (en) | 2021-12-28 | 2021-12-28 | Silicon controlled rectifier dimming circuit and lamp |
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| CN216721638U true CN216721638U (en) | 2022-06-10 |
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| CN202123361116.2U Active CN216721638U (en) | 2021-12-28 | 2021-12-28 | Silicon controlled rectifier dimming circuit and lamp |
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