CN218041854U - Maintaining circuit for silicon controlled rectifier dimming power supply - Google Patents
Maintaining circuit for silicon controlled rectifier dimming power supply Download PDFInfo
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- CN218041854U CN218041854U CN202221495795.4U CN202221495795U CN218041854U CN 218041854 U CN218041854 U CN 218041854U CN 202221495795 U CN202221495795 U CN 202221495795U CN 218041854 U CN218041854 U CN 218041854U
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 26
- 239000010703 silicon Substances 0.000 title claims abstract description 26
- 230000001960 triggered effect Effects 0.000 claims abstract description 5
- 230000005669 field effect Effects 0.000 claims description 40
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 11
- 241001465382 Physalis alkekengi Species 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model relates to a lamps and lanterns lighting technology field discloses a holding circuit for silicon controlled rectifier power of adjusting luminance that output holding current is stable and the reliability is higher, possesses: a power supply main circuit (101) for outputting a drive voltage; the switch circuit (103) is used for receiving L, N full-wave voltage rectified from mains supply input and keeping the full-wave voltage on to maintain the output of current; the voltage drop circuit (105) is used for receiving a voltage signal output by the switch circuit (103), when the voltage signal is at a high level, the voltage drop circuit (105) is triggered to be switched on, the driving voltage of the input end of the switch circuit (103) is pulled down, the on state is changed into the off state, and the holding current is reduced; when the voltage signal is at low level, the voltage drop circuit (105) is controlled to be closed, the driving voltage at the input end of the switch circuit (103) is changed from low level to high level, and is changed from cut-off to conduction, so that the stable output of the current is maintained.
Description
Technical Field
The utility model relates to a lamps and lanterns lighting technology field, more specifically say, relate to a holding circuit for silicon controlled rectifier power of adjusting luminance.
Background
Most existing silicon controlled rectifier dimming power supplies in the market are provided with silicon controlled rectifier maintaining circuits, and when a silicon controlled rectifier dimmer is turned down, maintaining current can be used for maintaining the conduction of the silicon controlled rectifier, so that a good dimming effect is achieved. However, the practical use result is not satisfactory, and most of the scr dimming power supplies are not adjusted to the minimum, and the scr dimmer is turned off in advance during dimming due to insufficient holding current provided by the power supply, which causes power dimming flicker.
Therefore, how to solve the problem of power dimming flicker caused by insufficient holding current provided by the power supply is an urgent need to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, because the holding current that the power provided is not enough to the aforesaid to prior art, leads to the silicon controlled rectifier dimmer to close in advance, causes the defect of power dimming scintillation, provides a holding circuit for silicon controlled rectifier power of output holding current stability and reliability are higher.
The utility model provides a technical scheme that its technical problem adopted is: a holding circuit for a thyristor light-control power supply is constructed, and the holding circuit is provided with:
the power supply main circuit is connected with the commercial power input and maintaining circuit and is used for outputting driving voltage to the lamp;
the input of the switching circuit is connected with the rear stage of the EMI circuit and used for receiving the rectified full-wave voltage, and the switching circuit is used for keeping conduction to maintain the output of current;
the input end of the voltage drop circuit is connected with the output end of the switch circuit and is used for receiving a voltage signal output by the switch circuit, and the voltage signal is used for controlling the on/off state of the voltage drop circuit;
when the voltage signal is at a high level, the voltage drop circuit is triggered to be switched on, the driving voltage at the input end of the switch circuit is pulled down, the switching-on state is changed into the switching-off state, and the holding current is reduced;
when the voltage signal is at a low level, the voltage drop circuit is controlled to be turned off, the driving voltage at the input end of the switch circuit is converted from the low level to the high level, the driving voltage is converted from the off state to the on state, and the holding current is stably output.
In some embodiments, the power supply further comprises a regulation and control circuit, an input end of the regulation and control circuit is connected with an output end of the power supply main circuit and is used for receiving the driving voltage, and the driving voltage is used for controlling the on/off state of the regulation and control circuit;
one input end of the regulating and controlling circuit is connected with the input end of the voltage drop circuit;
when the regulating circuit is in a conducting state, the voltage signal at the input end of the voltage drop circuit is increased, and the switching circuit is switched from conducting to stopping;
when the regulating circuit is in a cut-off state, the voltage signal at the input end of the voltage drop circuit is raised and pulled down, and the switch circuit is switched from cut-off to conduction.
In some embodiments, the switching circuit includes a first resistor and a first field effect transistor,
one end of the first resistor is connected with the output end of the main power supply circuit through an eighth resistor,
the grid electrode of the first field effect transistor is coupled to the other end of the first resistor,
the drain electrode of the first field effect transistor is connected with the output end of the power supply main circuit through the eighth resistor,
and the source electrode of the first field effect transistor is connected with the common end through a sixth resistor and a seventh resistor which are connected in series.
In some embodiments, the voltage drop circuit includes a first diode and a first transistor,
the anode of the first diode is connected with the source electrode of the first field effect transistor,
the cathode of the first diode is coupled to the base of the first triode,
the collector of the first triode is connected with the grid of the first field effect transistor,
and the base electrode of the first triode is connected with one input end of the regulating and controlling circuit.
In some embodiments, the regulation circuit comprises a ninth resistor, a tenth resistor and a second field effect transistor, wherein,
the ninth resistor is connected in series with the tenth resistor,
one end of the ninth resistor is connected with the output end of the power supply main circuit through the eighth resistor,
one end of the tenth resistor is coupled to the gate of the second fet,
the drain electrode of the second field effect transistor is connected with the anode of the first diode,
and the source electrode of the second field effect transistor is connected with the common end.
In some embodiments, the transistor further comprises a second transistor, a base of the second transistor is coupled to a drain of the second field effect transistor,
the collector of the second triode is connected with the anode of the first diode through a fourth resistor,
and the emitter of the second triode is connected with the common end.
In some embodiments, the base of the second transistor and the drain of the second fet are connected to a VDD power supply terminal through a twelfth resistor.
In some embodiments, the first transistor and the second transistor are both NPN transistors.
In some embodiments, the first fet and the second fet are both N-channel fets.
The maintaining circuit for the silicon controlled rectifier dimming power supply comprises a power supply main circuit, a switch circuit and a voltage drop circuit, wherein the power supply main circuit is used for outputting driving voltage to a lamp, and the switch circuit is used for keeping on so as to ensure the output of maintaining current; when the voltage signal is at a high level, the voltage drop circuit is triggered to be switched on, the driving voltage at the input end of the switch circuit is pulled down, the switching-on state is changed into the switching-off state, and the holding current is reduced; when the voltage signal is at low level, the voltage drop circuit is controlled to be closed, the driving voltage at the input end of the switch circuit is converted from low level to high level, and is converted from cut-off to conduction, so that the current is maintained to be stably output. Compared with the prior art, the switch circuit is circularly conducted with the voltage drop circuit, and the output holding current can enable the silicon controlled rectifier dimmer to be still kept in a conducting state when the silicon controlled rectifier dimmer is adjusted to a minimum conducting angle state, so that different types of silicon controlled rectifiers on the market are matched as much as possible, and the dimming power supply achieves better dimming linear width and dimming effect.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic circuit diagram of an embodiment of a sustain circuit for a scr dimming power supply.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in the first embodiment of the maintaining circuit for the triac dimming power supply of the present invention, the maintaining circuit 100 for the triac dimming power supply includes a power main circuit 101, an EMI main circuit 102, a switching circuit 103, a regulation and control circuit 104, and a voltage drop circuit 105.
The power main circuit 101 is used for outputting a driving voltage.
The EMI main circuit 102 is used to generate impedance, and has a large impedance to common mode signals.
The switch circuit 103 is configured to receive a full-wave voltage of L, N input mains voltage after rectification, so as to form a current loop for the mains input terminals L and N, so as to obtain a holding current that can keep the scr dimmer on.
The regulating circuit 104 is used for controlling the switch circuit 103 to keep an off state when the thyristor dimmer is turned down so as to increase the holding current.
The voltage drop circuit 105 is used to control the switch circuit 103 to switch between the on/off states continuously, so as to keep the current constant at a stable value.
Specifically, the power main circuit 101 is connected to a rear stage of the EMI main circuit 102, and outputs a driving voltage of the lamp.
The input end of the EMI main circuit 102 is connected to the mains input end L and N, respectively, and generates a large impedance to the common mode signal in the mains.
Further, the input terminal of the switching circuit 103 is connected to the rear stage of the EMI circuit, and is configured to receive a rectified full-wave voltage, which is used to trigger the conduction of the switching circuit 103, so that the triac dimmer obtains a holding current that is kept on.
The input end of the voltage drop circuit 105 is connected with the output end of the switch circuit 103, and is used for receiving the voltage signal output by the switch circuit 103 and controlling the on/off state of the voltage drop circuit 105 through the input voltage signal;
when the voltage signal at the input end of the voltage drop circuit 105 is at a high level, the voltage drop circuit 105 is triggered to be turned on, and the driving voltage at the input end of the switch circuit 103 is pulled down, so that the switch circuit 103 is turned off from being turned on, and the holding current is reduced;
when the voltage signal at the input end of the voltage drop circuit 105 is at a low level, the voltage drop circuit 105 is controlled to be closed, the driving voltage at the input end of the switch circuit 103 is converted from a low level to a high level, so that the switch circuit 103 is converted from a cut-off state to a conduction state, and the on/off state is stably output, the on/off state is repeated, so that the maintaining current can be kept at a relatively stable current value, the output maintaining current can keep the dimming controller in a conduction state, so as to match different types of silicon controlled dimmers on the market as much as possible, and the dimming power supply can achieve better dimming linear width and dimming effect, thereby effectively solving the problem that when the dimming controller of most silicon controlled dimming power supplies is not adjusted to the lowest, the silicon controlled dimming controller is closed in advance due to insufficient maintaining current provided by the power supply, and the power supply dimming flicker is caused.
In some embodiments, in order to ensure the reliability of the on/off state of the switch circuit 103, a regulation and control circuit 104 may be provided in the circuit, wherein an input terminal of the regulation and control circuit 104 is connected to an output terminal of the power main circuit 101, and is configured to receive a driving voltage output by the power main circuit 101, and the driving voltage is used for controlling the on/off state of the regulation and control circuit 104;
an input terminal of the regulating circuit 104 is connected to an input terminal of the voltage drop circuit 105.
When the regulating circuit 104 is in a conducting state, the voltage signal at the input end of the voltage drop circuit 105 is increased, the voltage drop circuit 105 is controlled to be conducted, and the switching circuit 103 is switched from conducting to stopping;
when the regulating circuit 104 is in an off state, the voltage signal at the input terminal of the voltage drop circuit 105 is pulled down, the voltage drop circuit 105 is controlled to be off, and the switch circuit 103 is switched from off to on.
In some embodiments, in order to improve the stability of the operating state of the switch circuit 103, a first resistor R101 and a first fet VT101 may be disposed in the switch circuit 103, wherein the first fet VT101N channel fet has a switching function.
Specifically, one end of the first resistor R101 is connected to the cathode terminals of the second diode VD102 and the third diode VD103 through the eighth resistor R108.
The gate of the first fet VT101 is coupled to the other end of the first resistor R101, that is, the driving voltage of the L, N commercial power passing through the EMI main circuit, the second diode VD102 and the third diode VD103 is input to the gate of the first fet VT101 through the eighth resistor R108 and the first resistor R101.
The drain of the first field effect transistor VT101 is connected with the cathode terminals of the second diode VD102, the third diode VD103 and the eighth resistor R108, and the driving voltage of L, N mains supply passing through the EMI main circuit, the second diode VD102 and the third diode VD103 is applied to the drain of the first field effect transistor VT101 to make it in a high level state.
The source of the first field effect transistor VT101 is connected to the common terminal through a sixth resistor R106 and a seventh resistor R107 connected in series.
Specifically, the first fet VT101 is turned on, and the voltage ACI flows through the eighth resistor R108, the first fet VT101, the sixth resistor R106, and the seventh resistor R10 to the common terminal (corresponding to GND), and then flows back to the mains input terminals L and N through the rectifier bridge DB01 to form a current loop, which is a holding current for holding the triac dimmer in conduction.
In some embodiments, in order to improve the operation reliability of the voltage drop circuit 105, a first capacitor C101, a first diode VD101, and a first transistor VT102 may be disposed in the voltage drop circuit 105, wherein the first transistor VT102 is an NPN transistor having a switching function.
Specifically, one end of the first capacitor C101 and the anode of the first diode VD101 are connected to the source of the first field effect transistor VT101, and the cathode of the first diode VD101 is coupled to the base of the first transistor VT 102.
The collector of the first transistor VT102 is connected to the gate of the first field effect transistor VT101, and the base of the first transistor VT102 and the other end of the first capacitor C101 are respectively connected to an input terminal of the regulation circuit 104.
In some embodiments, the regulation circuit 104 includes a ninth resistor R109, a tenth resistor, a sixth resistor R106, and a second fet VT104, wherein the second fet VT104 is an N-channel fet and has a switching function.
Specifically, the ninth resistor R109 is connected in series with the tenth resistor R110.
One end of the ninth resistor R109 is connected to the cathode terminals of the second diode VD102 and the third diode VD103 through the eighth resistor R108, and one end of the tenth resistor R110 is coupled to the gate of the second fet VT104, that is, the driving voltage output by the power main circuit 101 is input to the gate of the second fet VT104 through the eighth resistor R108, the ninth resistor R109 and the tenth resistor sixth resistor R106.
The drain of the second field effect transistor VT104 is connected to the anode of the first diode VD101, and the source of the second field effect transistor VT104 is connected to the common terminal (corresponding to GND).
In some embodiments, in order to improve the reliability of the sustain circuit, a second transistor VT103 may be disposed in the circuit, wherein the second transistor VT103 is an NPN transistor, which has a switching function.
Specifically, the base of the second transistor VT103 is coupled to the drain of the second field effect transistor VT104, the collector of the second transistor VT103 is connected to one end of the fourth resistor R104, the other end of the fourth resistor R104 is connected to one end of the first capacitor C101, the other end of the first capacitor C101 is connected to the anode of the first diode VD101, and the emitter of the second transistor VT103 is connected to the common terminal (corresponding to GND).
Further, the base of the second transistor VT103 and the drain of the second field effect transistor VT104 are connected to the VDD power supply terminal through a twelfth resistor sixth resistor R1062.
The specific working principle is as follows: one end of the silicon controlled dimmer is connected with mains supply, the other end of the silicon controlled dimmer is connected with a L, N input end of a power supply, and after the silicon controlled dimmer is powered on, the sine wave voltage of the mains supply is rectified by diodes of a second diode D102 and a third diode D103 to obtain a full wave voltage ACI.
The ACI voltage provides a driving voltage to the gate of the first fet VT101 through the eighth resistor R108 and the first resistor R101, so that the first fet VT101 is turned on, and the ACI voltage flows through the eighth resistor R108, the first fet VT101, the sixth resistor R106, and the seventh resistor R107 to the common terminal (corresponding to GND), and then flows back to the mains input terminals L and N through the rectifier bridge DB01 to form a current loop, which is a maintaining current for maintaining the triac dimmer to be turned on.
Furthermore, the ACI voltage passes through an eighth resistor R108 to obtain a DCI voltage, the DCI voltage passes through resistors R14 and R15 to the gate of a second field effect transistor VT104, the second field effect transistor VT104 is turned on, the VDD voltage is pulled low after passing through a twelfth resistor R112, and the second triode VT103 is always turned off; when the voltage value reaches a certain value, the voltage enters the base of the first triode VT102 through the first diode VD101, the first triode VT102 is turned on, the gate driving voltage of the first field effect transistor VT101 is pulled low, so that the first field effect transistor VT101 is turned off, the holding current is reduced, the voltage drop across the resistor of the sixth resistor R106 is also reduced, the triode Q2 is turned off, the first field effect transistor VT101 is turned on again, and the holding current is maintained at a relatively stable current value in a cycle.
When the voltage of the DCI voltage after passing through the ninth resistor R109 and the tenth resistor R110 cannot keep the second field effect transistor VT104 conductive, at this time, the voltage value of the VDD voltage after passing through the twelfth resistor R112 rises, the second triode VT103 recovers a conductive state, the driving voltage of the first triode VT102 is pulled down to a common terminal (corresponding to GND) through the fourth resistor R104 and the second triode VT103, the first triode VT102 keeps an off state, at this time, the first field effect transistor VT101 keeps a continuous conductive state, and correspondingly, the holding current is correspondingly increased.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the scope of the present invention, and these forms are all within the protection scope of the present invention.
Claims (9)
1. A holding circuit for a thyristor-controlled dimming power supply, comprising:
the power supply main circuit is connected with the commercial power input and maintaining circuit and is used for outputting driving voltage to the lamp;
the input of the switching circuit is connected with the rear stage of the EMI circuit and is used for receiving rectified full-wave voltage, and the switching circuit is used for keeping on to maintain the output of current;
the input end of the voltage drop circuit is connected with the output end of the switch circuit and is used for receiving a voltage signal output by the switch circuit, and the voltage signal is used for controlling the on/off state of the voltage drop circuit;
when the voltage signal is at a high level, the voltage drop circuit is triggered to be switched on, the driving voltage at the input end of the switch circuit is pulled down, the switching-on state is changed into the switching-off state, and the holding current is reduced;
when the voltage signal is at a low level, the voltage drop circuit is controlled to be turned off, the driving voltage at the input end of the switch circuit is converted from the low level to the high level and is converted from the off state to the on state, and the holding current is stably output.
2. The keeper circuit for a silicon controlled dimmer power supply of claim 1,
the input end of the regulation circuit is connected with the output end of the power supply main circuit and used for receiving the driving voltage, and the driving voltage is used for controlling the on/off state of the regulation circuit;
one input end of the regulating and controlling circuit is connected with the input end of the voltage drop circuit;
when the regulating circuit is in a conducting state, the voltage signal at the input end of the voltage drop circuit is increased, and the switching circuit is switched from conducting to stopping;
when the regulating circuit is in a cut-off state, the voltage signal at the input end of the voltage drop circuit is raised and pulled down, and the switch circuit is switched from cut-off to conduction.
3. The keeper circuit of claim 2, wherein the keeper circuit comprises a first circuit having a first end and a second end,
the switch circuit comprises a first resistor and a first field effect transistor,
one end of the first resistor is connected with the output end of the main power supply circuit through an eighth resistor,
the gate of the first field effect transistor is coupled to the other end of the first resistor,
the drain electrode of the first field effect transistor is connected with the output end of the power supply main circuit through the eighth resistor,
and the source electrode of the first field effect transistor is connected with the common end through a sixth resistor and a seventh resistor which are connected in series.
4. The keeper circuit for a silicon controlled dimmer power supply of claim 3,
the voltage drop circuit comprises a first diode and a first triode,
the anode of the first diode is connected with the source electrode of the first field effect transistor,
the cathode of the first diode is coupled to the base of the first triode,
the collector of the first triode is connected with the grid of the first field effect transistor,
and the base electrode of the first triode is connected with one input end of the regulating and controlling circuit.
5. The keeper circuit for a silicon controlled dimmer power supply of claim 4,
the regulating circuit comprises a ninth resistor, a tenth resistor and a second field effect transistor, wherein,
the ninth resistor is connected in series with the tenth resistor,
one end of the ninth resistor is connected with the output end of the power supply main circuit through the eighth resistor,
one end of the tenth resistor is coupled to the gate of the second fet,
the drain electrode of the second field effect transistor is connected with the anode of the first diode,
and the source electrode of the second field effect transistor is connected with the common end.
6. The keeper circuit for a silicon controlled dimmer power supply of claim 5,
the base electrode of the second triode is coupled with the drain electrode of the second field effect transistor,
the collector of the second triode is connected with the anode of the first diode through a fourth resistor,
and the emitter of the second triode is connected with the common end.
7. The keeper circuit of claim 6, wherein the keeper circuit comprises a first circuit having a first end and a second end,
and the base electrode of the second triode and the drain electrode of the second field effect transistor are connected with a VDD power supply end through a twelfth resistor.
8. The keeper circuit for a silicon controlled dimmer power supply of claim 7,
the first triode and the second triode are both NPN triodes.
9. The keeper circuit for a silicon controlled dimmer power supply of claim 7,
the first field effect transistor and the second field effect transistor are both N-channel field effect transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221495795.4U CN218041854U (en) | 2022-06-16 | 2022-06-16 | Maintaining circuit for silicon controlled rectifier dimming power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221495795.4U CN218041854U (en) | 2022-06-16 | 2022-06-16 | Maintaining circuit for silicon controlled rectifier dimming power supply |
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| Publication Number | Publication Date |
|---|---|
| CN218041854U true CN218041854U (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221495795.4U Active CN218041854U (en) | 2022-06-16 | 2022-06-16 | Maintaining circuit for silicon controlled rectifier dimming power supply |
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- 2022-06-16 CN CN202221495795.4U patent/CN218041854U/en active Active
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Effective date of registration: 20240617 Address after: 519000 Room 201, building 3, No.19, Yongtian Road, Xiangzhou District, Zhuhai City, Guangdong Province Patentee after: ZHUHAI SHENGCHANG ELECTRONICS Co.,Ltd. Country or region after: China Address before: Room 4217, Floor 4, No. 1238, Jiuzhou Avenue East, Jida, Zhuhai City, Guangdong Province, 519000 Patentee before: Zhuhai wofan Technology Co.,Ltd. Country or region before: China |