CN219124396U - Lamp, driving power supply and control circuit thereof - Google Patents
Lamp, driving power supply and control circuit thereof Download PDFInfo
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- CN219124396U CN219124396U CN202223273078.XU CN202223273078U CN219124396U CN 219124396 U CN219124396 U CN 219124396U CN 202223273078 U CN202223273078 U CN 202223273078U CN 219124396 U CN219124396 U CN 219124396U
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Abstract
The utility model discloses a lamp, a driving power supply and a control circuit thereof, wherein the control circuit is used for controlling an LED light source and comprises: a dimming module for generating a dimming control signal according to an external input signal; a voltage sampling module for sampling the output voltage to generate a voltage sampling signal; a compensation module for generating a compensation signal according to the voltage sampling signal when the dimming control signal is determined to be in a dimming on state, and setting the compensation signal to be an invalid signal when the dimming control signal is determined to be in a dimming off state; and the driving module is used for controlling the output current according to the voltage sampling signal, the compensation signal and the dimming control signal. By implementing the technical scheme of the utility model, when dimming is started, even if the load change range is larger, good load adjustment rate can be achieved; when the dimming is turned off, the compensation module can also set the compensation signal as an invalid signal, namely, the compensation is not performed, so that the purpose of turning off the driving module is achieved.
Description
Technical Field
The utility model relates to the field of power supplies, in particular to a lamp, a driving power supply and a control circuit thereof.
Background
For LED lamps in applications such as household lighting, industrial control, and communication control, the user has a high requirement for the constant output of the LED light source, and for example, the LED lamp is used as an example, and the consumer wants the LED light source to maintain the constant output. At present, most of driving chips in the market sample output voltage and combine the sampling current of a current-limiting resistor, and the on-off of a switching tube is adjusted after the processing inside the chip, so that the constant current output of a driving power supply is controlled.
In addition, when the load variation is large, the driving power supply must maintain high constant current precision under different loads and working environments in order to prevent the life and color temperature of the light source from being affected by overcurrent or undercurrent, i.e. the driving power supply must have good load adjustment rate, and the good load adjustment rate is one of the important indexes for measuring the constant output current capability and reliability of the driving power supply when the output voltage or load is changed
Therefore, when the output load variation range is large, the sampled output voltage will change along with the change of the output voltage, and the load adjustment rate will also change greatly, so it is difficult to keep the load adjustment rate good under the condition that the output load variation range is large.
Disclosure of Invention
The utility model aims to solve the technical problem that the load alignment rate is poor when the output load change range is large in the prior art, and provides a lamp, a driving power supply and a control circuit thereof.
The technical scheme adopted for solving the technical problems is as follows: a control circuit is configured for controlling an LED light source, comprising:
a dimming module for generating a dimming control signal according to an external input signal;
a voltage sampling module for sampling the output voltage to generate a voltage sampling signal;
a compensation module for generating a compensation signal according to the voltage sampling signal when the dimming control signal is determined to be in a dimming on state, and setting the compensation signal to be an invalid signal when the dimming control signal is determined to be in a dimming off state;
and the driving module is used for controlling output current according to the voltage sampling signal, the compensation signal and the dimming control signal.
Preferably, the driving module includes:
a driving controller for generating a PWM signal according to the voltage sampling signal, the compensation signal and the dimming control signal;
and the BUCK unit is used for converting the input voltage according to the PWM signal and providing the output voltage for the LED light source.
Preferably, the compensation module includes: the voltage sampling device comprises a diode D1, a diode D4, a diode D2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a switching tube Q1 and a switching tube Q2, wherein the positive electrode of the diode D1 is connected with the output end of the voltage sampling module, the negative electrode of the diode D1 is respectively connected with the positive electrode of the diode D4 and the first end of the resistor R4, the negative electrode of the diode D4 is grounded through the resistor R1, the resistor R2 and the resistor R3 which are connected in series in sequence, the connection point of the resistor R2 and the resistor R3 is respectively connected with the first end of the resistor R5, the second end of the resistor R5 is connected with the linear dimming end of the driving controller, the positive electrode of the diode D2 is respectively connected with the PWM dimming end of the driving controller, the negative electrode of the diode D2 is respectively connected with the first end of the capacitor C2 and the control end of the switching tube Q1, the connection point of the first end of the switching tube Q1 is respectively connected with the second end of the resistor R2 and the connection point of the switching tube Q2 is respectively connected with the second end of the resistor R2 and the second end of the switching tube Q2.
Preferably, the BUCK unit comprises a filter inductor; the voltage sampling module comprises a first voltage dividing unit, a second voltage dividing unit, a capacitor C4 and an auxiliary winding for sensing the voltage of the filter inductor, wherein the first end of the auxiliary winding is grounded, the second end of the auxiliary winding is sequentially grounded through the first voltage dividing unit and the second voltage dividing unit which are connected in series, the second end of the auxiliary winding is also connected with the anode of the diode D1, and the connecting end of the first voltage dividing unit and the second voltage dividing unit is connected with the voltage feedback end of the driving controller.
Preferably, the dimming module comprises a dimming controller, a switching tube Q9, a switching tube Q10, a resistor R7, a resistor R249, a resistor R248, a resistor R250, a resistor R405, a resistor R12, a resistor R19, a capacitor C25 and an optocoupler, wherein the output end of the dimming controller is connected with the first end of the resistor R7, the second end of the resistor R7 is connected with the control end of the switching tube Q9, the resistor R249 and the capacitor C25 are connected in parallel between the second end of the resistor R7 and the ground, the first end of the switching tube Q9 is connected with a high level through the resistor R248, the second end of the switching tube Q9 is grounded, the control end of the switch tube Q10 is respectively connected with the first end of the switch tube Q9 and the first end of the resistor R250, the second end of the switch tube Q10 and the second end of the resistor R250 are respectively grounded, the first end of the switch tube Q10 is connected with the negative input end of the optocoupler through the resistor R405, the positive input end of the optocoupler is connected with a high level, the positive output end of the optocoupler is connected with the high level through the resistor R12, the negative output end of the optocoupler is grounded, the resistor R19 is connected between the positive output end and the negative output end of the optocoupler, and the positive output end of the optocoupler is also respectively connected with the positive electrode of the diode D2 and the PWM dimming end of the driving controller.
Preferably, the driving module includes:
the first sampling unit is used for sampling output current and sending the output current into the driving controller to perform constant current control and overcurrent protection; and/or the number of the groups of groups,
the second sampling unit is used for sampling the power supply voltage and sending the power supply voltage to the driving controller for overvoltage protection; and/or
And the third sampling unit is used for sampling the ambient temperature and sending the ambient temperature into the driving controller for overheat protection.
The utility model also constructs a driving power supply which comprises a power supply circuit and the control circuit.
Preferably, the power supply circuit comprises an AC input module, an EMI module and a PFC module which are sequentially connected.
The utility model also constructs a lamp, which comprises an LED light source and the driving power supply.
When the technical scheme of the utility model is implemented, the compensation module can provide the compensation signal related to the output voltage for the driving module when the dimming is started, so that the driving module can adjust the output current according to the compensation signal besides the voltage sampling signal and the dimming control signal when controlling the output current, and even if the load change range is larger, the good load adjustment rate can be achieved; when the dimming is turned off, the compensation module can also set the compensation signal as an invalid signal, namely, the compensation is not performed, so that the purpose of turning off the driving module is achieved.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic block diagram of a first embodiment of a control circuit of the present utility model;
FIG. 2A is a partial circuit diagram of a second embodiment of a control circuit according to the present utility model;
FIG. 2B is a partial circuit diagram of a second embodiment of the control circuit of the present utility model;
FIG. 2C is a partial circuit diagram of a second embodiment of the control circuit of the present utility model;
fig. 2D is a partial circuit diagram of a second embodiment of the control circuit of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Fig. 1 is a logic structure diagram of a first embodiment of a control circuit of the present utility model, which is used for controlling the light emission of a light source, and includes: the device comprises a dimming module 10, a driving module 20, a voltage sampling module 30 and a compensation module 40, wherein the dimming module 10 is used for generating a dimming control signal according to an external input signal, and the dimming control signal comprises an on signal, an off signal and a brightness adjustment signal; the voltage sampling module 30 is configured to sample the output voltage to generate a voltage sampling signal; the compensation module 40 is configured to generate a compensation signal according to the voltage sampling signal when the dimming control signal is determined to be in a dimming on state, and set the compensation signal to an invalid signal when the dimming control signal is determined to be in a dimming off state; the driving module 20 is configured to control an output current according to the voltage sampling signal, the compensation signal and the dimming control signal.
In the technical scheme of the embodiment, the compensation module is added to introduce the compensation signal into the driving module, so that when the driving module controls the output current, the driving module can adjust the output current according to the compensation signal in addition to the voltage sampling signal and the dimming control signal, and therefore, even if the load change range is large, the good load adjustment rate can still be achieved, and when the dimming is turned off, the compensation module can also set the compensation signal as an invalid signal, namely, the compensation is not performed, so that the purpose of turning off the driving module is achieved.
Further, in an alternative embodiment, the driving module includes a driving controller and a BUCK unit, where the driving controller is configured to generate a PWM signal according to the voltage sampling signal, the compensation signal, and the dimming control signal; the BUCK unit is used for converting the input voltage according to the PWM signal and providing the output voltage for the LED light source.
Further, the driving controller is a constant current driving chip with overcurrent protection, overvoltage protection and overheat protection, for example, a chip with the model number of BP2879, and the driving module further comprises: the first sampling unit is used for sampling output current and sending the output current into the driving controller for constant current control and overcurrent protection; the second sampling unit is used for sampling the power supply voltage and sending the power supply voltage to the driving controller for overvoltage protection; the third sampling unit is used for sampling the ambient temperature and sending the ambient temperature into the driving controller for overheat protection.
The circuit configuration of the control circuit of the present utility model is described below with reference to fig. 2A to 2D:
in this embodiment, as shown in fig. 2A and 2B, the driving controller U2 is a controller with a model BP2879, and has a PWM dimming control terminal (PWM), a linear dimming terminal (DIM), a voltage feedback terminal (FB), an overvoltage protection terminal (CTRL), a power supply terminal (VCC), a control terminal (GATE), a current sampling terminal (CS), and a ground terminal (GND). The power supply end of the driving controller U2 is connected to a power supply voltage (Vcc), the overvoltage protection end of the driving controller U2 is connected to the power supply voltage (Vcc) through a resistor R245, the control end of the driving controller U2 is connected to the gate (G) of the MOS transistor Q301 through resistors R321 and R322, the source (C) of the MOS transistor Q301 is grounded through a resistor R15, and the drain of the MOS transistor Q301 is connected to the positive end (BUCK) of the input voltage through a diode D305. The positive end of the input voltage (BUCK) is also connected with the first input end of the common-mode inductor LF3, and the second input end of the common-mode inductor LF3 is connected with the drain electrode of the MOS tube Q301 through the filter inductor L2-A and the inductor BC 302. The first output end of the common mode inductor LF3 is connected with the positive end (V+) of the LED light source, and the second output end of the common mode inductor LF3 is connected with the negative end (V-) of the LED light source. The first end of the resistor R26 is connected with the source electrode of the MOS tube Q301, the second end of the resistor R26 is respectively connected with the first end of the resistor R18 and the first end of the resistor R6, the second end of the resistor R18 is connected with the current sampling end (CS) of the driving controller U2, and the second end of the resistor R6 is grounded through the adjustable resistor VR 1. In addition, the first end of the thermistor RT102 is connected to the power supply voltage (Vcc) through a resistor R22 and a resistor R315, the second end of the thermistor RT102 is grounded, the connection point of the resistor R22 and the resistor R315 is respectively connected to the control end of the three-terminal regulator U1 and the first end of the resistor R317, the anode of the three-terminal regulator U1 is grounded, the cathode of the three-terminal regulator U1 is respectively connected to the cathode of the zener diode ZD1 and the first end of the resistor R336, and the second end of the resistor R336 is connected to the power supply voltage (Vcc). The second end of the resistor R317 is connected with the drain electrode of the MOS transistor Q3, the source electrode of the MOS transistor Q3 is grounded, the grid electrode of the MOS transistor Q3 is respectively connected with the anode electrode of the zener diode ZD1 and the grid electrode of the MOS transistor Q4, the source electrode of the MOS transistor Q4 is grounded, and the drain electrode of the MOS transistor Q4 is connected with the linear dimming end (DIM) of the driving controller U2 through the resistor R313.
In this embodiment, as shown in fig. 2A, the voltage sampling module includes a first voltage dividing unit, a second voltage dividing unit, a capacitor C4, and an auxiliary winding L2-B for sensing the voltage of the filter inductor, where the first voltage dividing unit includes a resistor R16, the second voltage dividing unit is composed of resistors R20 and R17 connected in series, a first end of the auxiliary winding L2-B is grounded, a second end of the auxiliary winding L2-B is grounded sequentially through the resistors R16, R20 and R17 connected in series, the second end of the auxiliary winding L2-B is further connected to the compensation module, and a connection point between the resistor R16 and the resistor R20 is connected to a voltage feedback end (FB) of the driving controller U2.
As shown in fig. 2C, the dimming module includes a dimming controller U402, a switching tube Q9, a switching tube Q10, a resistor R7, a resistor R249, a resistor R248, a resistor R250, a resistor R405, a resistor R12, a resistor R19, a capacitor C25, and an optocoupler. The external input signal (dim+, DIM-) is connected to the dimming terminal (DIM) and the setting terminal (FSET) of the dimming controller U402, the output terminal (OUT) of the dimming controller is connected to the first terminal of the resistor R7, the second terminal of the resistor R7 is connected to the control terminal (base) of the switching tube (triode in this embodiment) Q9, the resistor R249 and the capacitor C25 are connected in parallel between the second terminal of the resistor R7 and the ground, the first terminal (collector) of the switching tube Q9 is connected to the power source terminal (HVCC) of the dimming controller U402 through the resistor R248, that is, to a high level, the second terminal (emitter) of the switching tube Q9 is connected to the ground, the control terminal (base) of the switching tube Q10 is connected to the first terminal (emitter) of the switching tube Q9 and the first terminal of the resistor R250, the first terminal (OT) of the switching tube Q10 is connected to the negative input terminal of the optocoupler 402 through the resistor R405, the positive Output Terminal (OT) of the optocoupler is connected to the positive Output Terminal (OT) of the positive output of the optocoupler 402, and the negative Output Terminal (OT) of the PWM 2 is connected to the positive output terminal of the PWM (positive output terminal of the PWM) 402, and the positive output terminal of the PWM 2 is connected to the positive output terminal of the optocoupler 402 is connected to the positive output terminal of the output resistor 402.
As shown in fig. 2D, the compensation module includes: the voltage sampling device comprises a diode D1, a diode D4, a diode D2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a switching tube Q1 and a switching tube Q2, wherein the anode of the diode D1 is connected with the output end of the voltage sampling module, the cathode of the diode D1 is respectively connected with the anode of the diode D4 and the end of the resistor R4, the cathode of the diode D4 is grounded through the resistor R1, the resistor R2 and the resistor R3 which are connected in series, the connection point of the resistor R2 and the resistor R3 is respectively connected with the end of the resistor R5 and the end of the capacitor C1, the end of the resistor R5 is connected with the linear dimming end of a driving controller, the anode of the capacitor C1 is grounded, the cathode of the diode D2 is connected with the PWM dimming end of the driving controller, the cathode of the diode D2 is respectively connected with the end of the capacitor C2 and the control end (base) of the switching tube Q1, the first end (emitter) of the switching tube Q1 is respectively connected with the second end of the resistor R4 and the second end of the switching tube Q1 respectively, the connection point of the switching tube Q2 is connected with the second end of the switching tube Q2 and the second end of the switching tube Q2 is connected with the end of the second end of the switching tube respectively.
Finally, it should be noted that the triode, the MOS transistor, etc. in the above embodiment may be replaced by other types of switching transistors, and the resistor with current limiting and filtering effects may be omitted in other embodiments, and the capacitor and inductor with filtering effects may be omitted.
The following describes the operation principle of the control circuit of this embodiment:
when the dimming controller U402 receives an externally input start signal, the output end (OUT) of the dimming controller U402 outputs a PWM signal with a certain duty ratio, and the PWM signal controls the switching tube Q9 to be turned on intermittently after passing through the resistor R7, and further controls the switching tube Q10 to be turned on intermittently, and the optocoupler OT402 is turned on intermittently, so that the P point is the PWM signal with a certain duty ratio. When the dimming controller U402 receives the externally input turn-off signal, the output terminal (OUT) of the dimming controller U402 outputs a low level signal, which causes the switching tube Q9 to be turned off, the switching tube Q10 to be turned on, and the optical coupler OT402 to be turned on, where the voltage at the P point is low.
In addition, when the dimming is turned on, the control end (CS) of the driving controller U2 controls the on/off of the switching tube Q301 by outputting a PWM signal, so as to perform corresponding conversion on the input voltage (BUCK) to output a corresponding voltage to the LED light source. Also, the duty ratio of the PWM signal output by the control terminal (CS) of the drive controller U2 is related to:
1. sampling signal of output current
The resistor R6 can sample the output current, convert the output current into a voltage signal and send the voltage signal to a current sampling end (CS) of the driving controller U2;
2. sampling signal of output voltage
The auxiliary winding L2-B can sense the voltage of the filter inductor L2-A, and the sensed voltage is fed into a current feedback end (FB) of the driving controller U2 after being divided by the resistors R16, R20 and R17;
PWM dimming signal
When the dimming controller U402 is turned on, the user may input a dimming signal (e.g., brightness is turned up or turned down) to the dimming controller U402, and the output terminal (OUT) of the dimming controller U402 may output a PWM signal with a corresponding duty cycle, e.g., the larger the duty cycle, the higher the representative brightness; the smaller the duty cycle, the lower the representative brightness;
4. compensation signal
The voltage (voltage at the point B) on the auxiliary winding L2-B is sent to a compensation module, and in the compensation module, since the PWM signal at the point P becomes a stable high-level signal after passing through the capacitor C2, the switching tube Q1 is conducted, the switching tube Q2 is not conducted, at the moment, the voltage at the point D only changes along with the change of the voltage at the point B, and when the voltage at the point D becomes high, the voltage at the point B also becomes high; when the voltage at point D becomes low, the voltage at point B also becomes low. The voltage at the point D is then fed to the linear compensation terminal (DIM) of the driving controller U2, so that the driving controller U2 can adjust the duty ratio of the PWM signal output from its control terminal according to the compensation signal and in combination with the other three signals (the sampling signal of the output voltage, the sampling signal of the output current, the PWM dimming signal). Therefore, even if the load variation range is large, since the compensation signal varying with the output voltage variation is introduced, a good load adjustment rate can be achieved.
When dimming is turned off, since the output terminal (OUT) of the dimming controller U402 outputs a low level signal, the signal turns off the switching tube Q9, turns on the switching tube Q10, and turns on the photo-coupler OT402, and the voltage at the point P is low. In the compensation module, since the voltage at the point P is at a low level, the switching tube Q1 is turned off and the switching tube Q2 is turned on, and at this time, the voltage at the connection point of the resistors R1 and R2 is pulled down, so that the voltage at the point D is at a low level. And when the voltage at the point D is low level, the drive controller U2 is completely turned off.
The present utility model also constructs a driving power supply including the power supply circuit and the control circuit described above.
Preferably, the power supply circuit includes an AC input module, an EMI module, and a PFC module connected in sequence.
The utility model also constructs a lamp, which comprises an LED light source and the driving power supply.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the scope of the claims of the present utility model.
Claims (9)
1. A control circuit for controlling an LED light source, comprising:
a dimming module for generating a dimming control signal according to an external input signal;
a voltage sampling module for sampling the output voltage to generate a voltage sampling signal;
a compensation module for generating a compensation signal according to the voltage sampling signal when the dimming control signal is determined to be in a dimming on state, and setting the compensation signal to be an invalid signal when the dimming control signal is determined to be in a dimming off state;
and the driving module is used for controlling output current according to the voltage sampling signal, the compensation signal and the dimming control signal.
2. The control circuit of claim 1, wherein the drive module comprises:
a driving controller for generating a PWM signal according to the voltage sampling signal, the compensation signal and the dimming control signal;
and the BUCK unit is used for converting the input voltage according to the PWM signal and providing the output voltage for the LED light source.
3. The control circuit of claim 2, wherein the compensation module comprises: the voltage sampling device comprises a diode D1, a diode D4, a diode D2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a switching tube Q1 and a switching tube Q2, wherein the positive electrode of the diode D1 is connected with the output end of the voltage sampling module, the negative electrode of the diode D1 is respectively connected with the positive electrode of the diode D4 and the first end of the resistor R4, the negative electrode of the diode D4 is grounded through the resistor R1, the resistor R2 and the resistor R3 which are connected in series in sequence, the connection point of the resistor R2 and the resistor R3 is respectively connected with the first end of the resistor R5, the second end of the resistor R5 is connected with the linear dimming end of the driving controller, the positive electrode of the diode D2 is respectively connected with the PWM dimming end of the driving controller, the negative electrode of the diode D2 is respectively connected with the first end of the capacitor C2 and the control end of the switching tube Q1, the connection point of the first end of the switching tube Q1 is respectively connected with the second end of the resistor R2 and the connection point of the switching tube Q2 is respectively connected with the second end of the resistor R2 and the second end of the switching tube Q2.
4. The control circuit of claim 3, wherein the BUCK unit includes a filter inductor; the voltage sampling module comprises a first voltage dividing unit, a second voltage dividing unit, a capacitor C4 and an auxiliary winding for sensing the voltage of the filter inductor, wherein the first end of the auxiliary winding is grounded, the second end of the auxiliary winding is sequentially grounded through the first voltage dividing unit and the second voltage dividing unit which are connected in series, the second end of the auxiliary winding is also connected with the anode of the diode D1, and the connecting end of the first voltage dividing unit and the second voltage dividing unit is connected with the voltage feedback end of the driving controller.
5. The control circuit of claim 3, wherein the dimming module comprises a dimming controller, a switching tube Q9, a switching tube Q10, a resistor R7, a resistor R249, a resistor R248, a resistor R250, a resistor R405, a resistor R12, a resistor R19, a capacitor C25 and an optocoupler, wherein an output end of the dimming controller is connected with a first end of the resistor R7, a second end of the resistor R7 is connected with a control end of the switching tube Q9, the resistor R249 and the capacitor C25 are connected in parallel between the second end of the resistor R7 and the ground, the first end of the switching tube Q9 is connected with a high level through the resistor R248, the second end of the switching tube Q9 is grounded, the control end of the switch tube Q10 is respectively connected with the first end of the switch tube Q9 and the first end of the resistor R250, the second end of the switch tube Q10 and the second end of the resistor R250 are respectively grounded, the first end of the switch tube Q10 is connected with the negative input end of the optocoupler through the resistor R405, the positive input end of the optocoupler is connected with a high level, the positive output end of the optocoupler is connected with the high level through the resistor R12, the negative output end of the optocoupler is grounded, the resistor R19 is connected between the positive output end and the negative output end of the optocoupler, and the positive output end of the optocoupler is also respectively connected with the positive electrode of the diode D2 and the PWM dimming end of the driving controller.
6. The control circuit of claim 2, wherein the drive module comprises:
the first sampling unit is used for sampling output current and sending the output current into the driving controller to perform constant current control and overcurrent protection; and/or the number of the groups of groups,
the second sampling unit is used for sampling the power supply voltage and sending the power supply voltage to the driving controller for overvoltage protection; and/or
And the third sampling unit is used for sampling the ambient temperature and sending the ambient temperature into the driving controller for overheat protection.
7. A drive power supply comprising a supply circuit, characterized in that it further comprises a control circuit as claimed in any one of claims 1-6.
8. The drive power supply of claim 7, wherein the power supply circuit comprises an AC input module, an EMI module, and a PFC module connected in sequence.
9. A luminaire comprising an LED light source, characterized in that it further comprises the drive power supply of any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223273078.XU CN219124396U (en) | 2022-12-07 | 2022-12-07 | Lamp, driving power supply and control circuit thereof |
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| CN202223273078.XU CN219124396U (en) | 2022-12-07 | 2022-12-07 | Lamp, driving power supply and control circuit thereof |
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| CN219124396U true CN219124396U (en) | 2023-06-02 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |