CN215956689U - Inductive control circuit of switching power supply - Google Patents
Inductive control circuit of switching power supply Download PDFInfo
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- CN215956689U CN215956689U CN202121040308.0U CN202121040308U CN215956689U CN 215956689 U CN215956689 U CN 215956689U CN 202121040308 U CN202121040308 U CN 202121040308U CN 215956689 U CN215956689 U CN 215956689U
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Abstract
The utility model discloses a switching power supply induction control circuit which comprises a power supply circuit, a constant current driving circuit, a first induction circuit and an LED module, wherein the power supply circuit is connected with the constant current driving circuit and used for supplying power to the constant current driving circuit; the power supply end of the constant current driving circuit is connected with the current input end of the constant current driving circuit through the LED module, the power supply end of the constant current driving circuit is also connected with the power supply input end of the first induction circuit, and the output end of the first induction circuit is connected with the signal input end of the constant current driving circuit; the first sensing circuit is used for controlling the output state of the constant current driving circuit according to the collected first sensing signal so as to control the on and off of the LED module; the first sensing signal is a light sensing signal or a human body sensing signal. The utility model can realize the function of an inductive switch and has the advantages of simple circuit structure, low cost, high intelligent degree and high power factor.
Description
Technical Field
The utility model relates to the field of illumination, in particular to a switching power supply induction control circuit.
Background
The development history of LED lamps has been decades, and with the rapid development of LED technology, the light emitting efficiency thereof is gradually improved and the manufacturing cost thereof is gradually reduced, so that the application market of LED lamps will be wider, especially under the background of global energy shortage, the application prospect of LED lamps in the lighting market is receiving attention, and the LED lamps are considered to become the best market and the largest market in the next 10 years by the industry, and will replace incandescent lamps, compact energy saving lamps and fluorescent lamps, becoming the next generation of novel light sources.
The power factor of the existing LED lamp is low, and the induction function is single; meanwhile, if the inductive switch function is added on the basis, the circuit structure is more complex, and the corresponding cost is more expensive. Therefore, how to further increase the power factor, simplify the circuit structure and reduce the component cost becomes a technical problem in the development of LED lamps.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a switching power supply induction control circuit, which can realize an induction switching function and has the advantages of simple circuit structure, low cost, high intelligent degree and high power factor.
In order to solve the technical problem, the utility model provides a switching power supply induction control circuit, which comprises a power supply circuit, a constant current driving circuit, a first induction circuit and an LED module, wherein the power supply circuit is connected with the constant current driving circuit and used for supplying power to the constant current driving circuit; the power supply end of the constant current driving circuit is connected with the current input end of the constant current driving circuit through the LED module, the power supply end of the constant current driving circuit is also connected with the power supply input end of the first induction circuit, and the output end of the first induction circuit is connected with the signal input end of the constant current driving circuit; the first induction circuit is used for controlling the output state of the constant current driving circuit according to the collected first induction signal so as to control the on and off of the LED module; the first sensing signal is a light sensing signal or a human body sensing signal.
Preferably, the first sensing circuit includes a first sensing module and a first sensing voltage division module, a first end of the first sensing voltage division module is a power input end of the first sensing circuit, a second end of the first sensing voltage division module is connected with the power input end of the first sensing module, a third end of the first sensing voltage division module is grounded, an output end of the first sensing module is an output end of the first sensing circuit, and a ground end of the first sensing module is grounded;
or the first sensing circuit comprises a first sensing module, a voltage stabilizing module and a first filtering module, wherein the power input end of the voltage stabilizing module is the power input end of the first sensing circuit, the output end of the voltage stabilizing module is grounded through the first filtering module, the output end of the voltage stabilizing module is also connected with the power input end of the first sensing module, the output end of the first sensing module is the output end of the first sensing circuit, and the grounding end of the first sensing module is grounded;
or the first induction circuit comprises a first induction module, a voltage stabilizing module, a first filtering module and a signal processing module, the power input end of the voltage stabilizing module is the power input end of the first induction circuit, the output end of the voltage stabilizing module is grounded through the first filtering module, the output end of the voltage stabilizing module is also connected with the power input end of the first induction module and the power input end of the signal processing module respectively, the output end of the first induction module is connected with the signal input end of the signal processing module, the signal output end of the signal processing module is the output end of the first induction circuit, and the grounding end of the signal processing module and the grounding end of the first induction module are grounded.
Preferably, when the first sensing circuit includes the first sensing module and a first sensing voltage division module, the first sensing voltage division module includes a first voltage division resistor and a second voltage division resistor, one end of the first voltage division resistor is a first end of the first sensing voltage division module, the other end of the first voltage division resistor is a second end of the first sensing voltage division module, the other end of the first voltage division resistor is further connected to one end of the second voltage division resistor, and the other end of the second voltage division resistor is a third end of the first sensing voltage division module;
when the first sensing circuit comprises a first sensing module, a voltage stabilizing module and a first filtering module, the voltage stabilizing module comprises a voltage stabilizing chip, a third voltage dividing resistor and a fourth voltage dividing resistor, one end of the third voltage dividing resistor is a power supply input end of the voltage stabilizing module, the other end of the third voltage dividing resistor is connected with a voltage input pin of the voltage stabilizing chip and is grounded through the fourth voltage dividing resistor, and an output pin of the voltage stabilizing chip is an output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor, a second filtering resistor and a first filtering capacitor, a voltage output pin of the voltage stabilizing chip is respectively connected with one end of the first filtering resistor and one end of the first filtering capacitor, the other end of the first filtering resistor is respectively connected with one end of the second filtering resistor and a voltage adjusting pin of the voltage stabilizing chip, and the other end of the second filtering resistor is respectively connected with the other end of the first filtering capacitor and the ground;
when the first sensing circuit comprises a first sensing module, a voltage stabilizing module, a first filtering module and a signal processing module, the voltage stabilizing module comprises a voltage stabilizing chip, a third voltage dividing resistor and a fourth voltage dividing resistor, one end of the third voltage dividing resistor is a power supply input end of the voltage stabilizing module, the other end of the third voltage dividing resistor is connected with a voltage input pin of the voltage stabilizing chip and is grounded through the fourth voltage dividing resistor, and an output pin of the voltage stabilizing chip is an output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor, a second filtering resistor and a first filtering capacitor, the voltage output end of the voltage stabilizing chip is respectively connected with one end of the first filtering resistor and one end of the first filtering capacitor, the other end of the first filtering resistor is respectively connected with one end of the second filtering resistor and a voltage adjusting pin of the voltage stabilizing chip, and the other end of the second filtering resistor is respectively connected with the other end of the first filtering capacitor and the ground; the signal processing module comprises a signal processing chip, a first current-limiting resistor, a fifth voltage-dividing resistor and a sixth voltage-dividing resistor, a power input pin of the signal processing chip is a power input end of the signal processing module, a signal input pin of the signal processing chip is connected with one end of the first current-limiting resistor, the other end of the first current-limiting resistor is a signal input end of the signal processing module, a signal output pin of the signal processing chip is connected with one end of the fifth voltage-dividing resistor, the other end of the fifth voltage-dividing resistor is grounded through the sixth resistor, and the other end of the fifth resistor is a signal output end of the signal processing module.
Preferably, the switch power supply induction control circuit further comprises a second induction circuit, the second induction circuit comprises a second induction module and a switch module, a power supply input end of the second induction module is connected with a power supply end of the constant current driving circuit, an output end of the second induction module is connected with a control end of the switch module, a grounding end of the second induction module is grounded, and a power supply end of the constant current driving circuit is connected with a current input end of the constant current driving chip through the switch module and the LED module; the second sensing module is used for controlling the on-off of the switch module according to the collected second sensing signal so as to control the on-off of the LED module; the first sensing signal and the second sensing signal are both light sensing signals or human body sensing signals, and the first sensing signal and the second sensing signal are different types of sensing signals.
Preferably, the switch module comprises a switch tube unit and a second induction voltage division unit;
the first end of the second induction voltage division unit is a control end of the switch module, the second end of the second induction voltage division unit is connected with the control end of the switch tube unit, the third end of the second induction voltage division unit is respectively connected with the current input end of the constant current driving circuit, the first output end and the second output end of the switch tube unit, the first input end of the switch tube unit is connected with the power supply end of the constant current driving circuit, and the second input end of the switch tube unit is connected with the output end of the LED module;
or the first end of the second induction voltage division unit is a control end of the switch module, the second end of the second induction voltage division unit is connected with the control end of the switch tube unit, the third end of the second induction voltage division unit is respectively connected with the current input end of the constant current driving circuit and the first output end of the switch tube unit, the first input end and the second input end of the switch tube unit are both connected with the power supply end of the constant current driving circuit, and the second output end of the switch tube unit is connected with the current input end of the constant current driving circuit through the LED module.
Preferably, the second sensing voltage division unit includes a seventh voltage division resistor and an eighth voltage division resistor, and the switching tube unit includes a first NPN type triode, a second current limiting resistor, and a third current limiting resistor; one end of the seventh voltage-dividing resistor is a first end of the second sensing voltage-dividing unit, one end of the seventh voltage-dividing resistor is further connected with one end of the eighth voltage-dividing resistor, the other end of the seventh voltage-dividing resistor is a third end of the second sensing voltage-dividing unit, and the other end of the eighth voltage-dividing resistor is a second end of the second sensing voltage-dividing unit; a base electrode of the first NPN type triode is a control end of the switching tube unit, a collector electrode of the first NPN type triode is respectively connected with one end of the second current-limiting resistor and a base electrode of the second NPN type triode, the other end of the second current-limiting resistor is a first input end of the switching tube unit, an emitter electrode of the first NPN type triode is a first output end of the switching tube unit, a collector electrode of the second NPN type triode is connected with one end of the third current-limiting resistor, the other end of the third current-limiting resistor is a second input end of the switching tube unit, and an emitter electrode of the second NPN type triode is a second output end of the switching tube unit;
or the second sensing voltage division unit comprises a seventh voltage division resistor and an eighth voltage division resistor, and the switching tube unit comprises a first N-channel MOS tube, a second N-channel MOS tube, a ninth voltage division resistor, a tenth voltage resistor and a first capacitor; one end of the seventh voltage-dividing resistor is a first end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor is a second end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor is further connected with one end of the eighth voltage-dividing resistor, and the other end of the eighth voltage-dividing resistor is a third end of the second sensing voltage-dividing unit; the grid of first N channel MOS pipe does the control end of switch tube unit, the source electrode of first N channel MOS pipe does the first output of switch tube unit, the drain electrode of first N channel MOS pipe respectively with the grid of second N channel MOS pipe and the one end of ninth divider resistance are connected, the one end of ninth divider resistance still passes through tenth divider resistance with the source electrode of first N channel MOS pipe is connected, the other end of ninth divider resistance is the first input of switch tube unit, the source electrode of second N channel MOS pipe does the second output of switch tube unit, the drain electrode of second N channel MOS pipe does the second input of switch tube unit, the source electrode of second N channel MOS pipe still pass through first electric capacity with the drain electrode of second N channel MOS pipe is connected.
Preferably, the constant current driving circuit comprises a first constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, a power supply input end of the first constant current driving module is connected with an output end of the power supply circuit, a power supply end of the first constant current driving module is a power supply end of the constant current driving circuit, a current sampling end of the first constant current driving module is grounded through the current sampling module, a setting end of the first constant current driving module is grounded through the overvoltage regulating module, a setting end of the first constant current driving module is a signal input end of the constant current driving circuit, a first end of the energy storage module is a current input end of the constant current driving circuit, a second end of the energy storage module is connected with a current input end of the first constant current driving module, and one end of the second filtering module is connected with a power supply end of the first constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module;
or the constant current driving circuit comprises a second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, the power supply end of the second constant current driving module is the power supply end of the constant current driving circuit, the power supply end of the second constant current driving module is connected with the output end of the power supply circuit, the current sampling end of the second constant current driving module is grounded through the current sampling module, the setting end of the second constant current driving module is grounded through the overvoltage regulating module, the setting end of the second constant current driving module is the signal input end of the constant current driving circuit, the first end of the energy storage module is the current input end of the constant current driving circuit, the second end of the energy storage module is connected with the current input end of the second constant current driving module, and one end of the second filtering module is connected with the power supply end of the second constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module.
Preferably, when the constant current driving circuit includes the first constant current driving module, the current sampling module, the overvoltage regulating module, the energy storage module and the second filtering module, the first constant current driving module includes a first constant current driving chip, a power input pin of the first constant current driving chip is a power input end of the first constant current driving module, a power supply pin of the first constant current driving chip is a power supply end of the first constant current driving module, a current sampling pin of the first constant current driving chip is a current sampling end of the first constant current driving module, a setting pin of the first constant current driving chip is a setting end of the first constant current driving module, a grounding pin of the first constant current driving chip is grounded, the current sampling module includes a sampling resistor, the current sampling pin of the first constant current driving chip is grounded through the sampling resistor, the overvoltage adjusting module comprises an adjusting resistor, a setting pin of the first constant current driving chip is grounded through the adjusting resistor, the second filtering module comprises a second filtering capacitor and a load resistor, the anode of the second filtering capacitor is respectively connected with a power supply pin of the first constant current driving chip and one end of the load resistor, the cathode of the second filtering capacitor is connected with the other end of the load resistor,
the energy storage module comprises an energy storage inductor, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is also connected with the negative electrode of the second filter capacitor, the second end of the energy storage inductor is the second end of the energy storage module,
or the energy storage module comprises an energy storage inductor and a freewheeling diode, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is also connected with the negative electrode of the second filter capacitor, the second end of the energy storage inductor is the second end of the energy storage module, the second end of the energy storage inductor is also connected with the positive electrode of the freewheeling diode, and the negative electrode of the freewheeling diode is connected with the positive electrode of the second filter capacitor;
when the constant current driving circuit comprises a second constant current driving module, a current sampling module, an overvoltage adjusting module, an energy storage module and a second filtering module,
the second constant current driving module comprises a second constant current driving chip and a power supply resistor, one end of the power supply resistor is a power supply end of the second constant current driving module, the other end of the power supply resistor is connected with a power supply pin of the second constant current driving chip, a current sampling pin of the second constant current driving chip is a current sampling end of the second constant current driving module, a setting pin of the second constant current driving chip is a setting end of the second constant current driving module, a grounding pin of the second constant current driving chip is grounded, the current sampling module comprises a sampling resistor, a current sampling pin of the second constant current driving chip is grounded through the sampling resistor, the overvoltage adjusting module comprises an adjusting resistor, the setting pin of the second constant current driving chip is grounded through the adjusting resistor, and the second filtering module comprises a second filtering capacitor and a load resistor, the anode of the second filter capacitor is respectively connected with one end of the power supply resistor and one end of the load resistor, the cathode of the second filter capacitor is connected with the other end of the load resistor, the energy storage module comprises an energy storage inductor and a fly-wheel diode, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is also connected with the cathode of the second filter capacitor, the second end of the energy storage inductor is the second end of the energy storage module, the second end of the energy storage inductor is also connected with the anode of the fly-wheel diode, and the cathode of the fly-wheel diode is connected with the anode of the second filter capacitor,
or the second constant current driving module comprises a second constant current driving chip, a starting resistor and a starting capacitor, one end of the starting resistor is a power supply end of the second constant current driving module, the other end of the starting resistor is connected with a power supply pin of the second constant current driving chip and is grounded through the starting capacitor, a current sampling pin of the second constant current driving chip is a current sampling end of the second constant current driving module, a setting pin of the second constant current driving chip is a setting end of the second constant current driving module, a grounding pin of the second constant current driving chip is grounded, the current sampling module comprises a sampling resistor, a current sampling pin of the second constant current driving chip is grounded through the sampling resistor, the overvoltage adjusting module comprises an adjusting resistor, and a setting pin of the second constant current driving chip is grounded through the adjusting resistor, the second filtering module comprises a second filtering capacitor and a load resistor, the anode of the second filtering capacitor is respectively connected with one end of the starting resistor and one end of the load resistor, the cathode of the second filtering capacitor is connected with the other end of the load resistor, the energy storage module comprises an energy storage inductor and a freewheeling diode, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is connected with the cathode of the second filtering capacitor, the second end of the energy storage inductor is the second end of the energy storage module, the second end of the energy storage inductor is connected with the anode of the freewheeling diode, and the cathode of the freewheeling diode is connected with the anode of the second filtering capacitor.
Preferably, when the constant current driving circuit comprises the first constant current driving module, the current sampling module, the overvoltage regulating module, the energy storage module and the second filtering module, the power supply circuit comprises a power input end and an anti-surge module, the power input end is connected with one end of the anti-surge module, and the other end of the anti-surge module is an output end of the power supply circuit;
when the constant current driving circuit comprises the second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, the power supply circuit comprises a power supply input end, an anti-surge module, a rectifying module and a third filtering module, the power supply input end is connected with the input end of the rectifying module through the anti-surge module, the output end of the rectifying module is grounded through the third filtering module, and the output end of the rectifying module is the output end of the power supply circuit; the anti-surge module is used for inhibiting surge voltage and current, and the rectification module is used for converting alternating current output by the power supply input end into direct current.
Preferably, the switching power supply induction control circuit further comprises a color temperature switching circuit, the color temperature switching circuit comprises a dial switch and a switch filtering module, the dial switch comprises a first end and at least two second ends, the LED module comprises at least two LED units, the at least two LED units emit light at different color temperatures, the second ends of the dial switch and the LED units are in one-to-one correspondence, and the second ends of the dial switch and the switch filtering module are in one-to-one correspondence;
each second end of the dial switch is respectively connected with the corresponding LED unit, and each second end of the dial switch is also respectively connected with the first end of the dial switch through the corresponding switch filtering module;
the first end of the dial switch is also connected with the power supply end of the constant current driving circuit, or the first end of the dial switch is also connected with the current input end of the constant current driving circuit;
the dial switch is used for controlling connection and disconnection between the first end of the dial switch and each second end of the dial switch so as to switch the color temperature of the LED module, and the switch filtering module is used for filtering noise waves generated by shifting the dial switch.
The beneficial effects of the implementation of the utility model are as follows:
according to the utility model, the first sensing circuit is used for collecting light sensing signals in the environment or human body sensing signals when a human body passes through, when the first sensing signal collected by the first sensing circuit triggers a preset signal threshold, the output end of the first sensing circuit outputs a corresponding level signal to control the output state of the constant current driving circuit, so that the on and off of the LED module are controlled, the automatic light sensing control or the human body movement control is realized, the complex manual mechanical control is not needed, the requirements of different use scenes are met, and the LED constant current driving circuit has the advantages of simple circuit structure and low cost.
Drawings
FIG. 1 is a schematic block diagram of an inductive control circuit of a switching power supply according to the present invention;
FIG. 2 is a schematic circuit diagram of a first embodiment of an inductive control circuit for a switching power supply according to the present invention;
FIG. 3 is a schematic circuit diagram of a second embodiment of the inductive control circuit of the switching power supply of the present invention;
FIG. 4 is a schematic circuit diagram of a third embodiment of the inductive control circuit of the switching power supply of the present invention;
FIG. 5 is a schematic circuit diagram of a fourth embodiment of the inductive control circuit of the switching power supply of the present invention;
fig. 6 is a schematic circuit diagram of a fifth embodiment of the inductive control circuit of the switching power supply according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the utility model is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the utility model.
As shown in fig. 1, the utility model provides a switching power supply sensing control circuit, which includes a power supply circuit 3, a constant current driving circuit 2, a first sensing circuit 1 and an LED module 4, wherein the power supply circuit 3 is connected to the constant current driving circuit 2 and is used for supplying power to the constant current driving circuit 2; the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving circuit 2 through the LED module 4, the power supply end of the constant current driving circuit 2 is also connected with the power supply input end of the first induction circuit 1, and the output end of the first induction circuit 1 is connected with the signal input end of the constant current driving circuit 2; the first induction circuit 1 is used for controlling the output state of the constant current driving circuit 2 according to the collected first induction signal, so as to control the on and off of the LED module 4; the first sensing signal is a light sensing signal or a human body sensing signal. Note that the output state of the constant current drive circuit 2 includes a state in which the constant current drive circuit 2 holds an output and a state in which the constant current drive circuit 2 turns off the output.
According to the utility model, the first sensing circuit 1 is used for collecting light sensing signals in the environment or human body sensing signals passed by a human body, when the first sensing signal collected by the first sensing circuit 1 triggers a preset signal threshold, the output end of the first sensing circuit 1 outputs a corresponding level signal to control the output state of the constant current driving circuit 2, so that the on and off of the LED module 4 are controlled, the automatic light sensing control or the human body movement control is realized, the complex manual mechanical control is not needed, the requirements of different use scenes are met, and the LED constant current driving circuit has the advantages of simple circuit structure and low cost.
As shown in fig. 2, a first embodiment of the present invention is provided;
the power supply circuit 3 comprises a power supply input end, an anti-surge module FR1, a rectifying module (a rectifying bridge DB1) and a third filtering module C2, wherein the power supply input end is connected with the input end of the rectifying module through the anti-surge module, the output end of the rectifying module is grounded through the third filtering module, and the output end of the rectifying module is the output end of the power supply circuit; the power supply comprises a power supply input end, an anti-surge module and a rectification module, wherein the power supply input end is used for accessing alternating current, the anti-surge module is used for inhibiting surge voltage and current, and the rectification module is used for converting the alternating current output by the power supply input end into direct current; of course, this is only one specific embodiment of the power supply circuit 3, and the power supply circuit of this embodiment may also adopt other embodiments to implement the function of supplying power to the constant current driving circuit 2, which is not limited in the present invention.
The constant current driving circuit 2 comprises a second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, wherein the power supply end of the second constant current driving module is the power supply end of the constant current driving circuit 2, the power supply end of the second constant current driving module is connected with the output end of the power supply circuit 3, the current sampling end of the second constant current driving module is grounded through the current sampling module, the setting end of the second constant current driving module is grounded through the overvoltage regulating module, the setting end of the second constant current driving module is the signal input end of the constant current driving circuit 2, the first end of the energy storage module is the current input end of the constant current driving circuit 2, the second end of the energy storage module is connected with the current input end of the second constant current driving module, one end of the second filtering module is connected with the power supply end of the second constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module. Specifically, the second constant current driving module includes a second constant current driving chip U1 and a power supply resistor R3, one end of the power supply resistor R3 is a power supply end of the second constant current driving module, the other end of the power supply resistor R3 is connected to a power supply pin VIN of the second constant current driving chip U1, a current sampling pin ISP of the second constant current driving chip U1 is a current sampling end of the second constant current driving module, a setting pin OVP of the second constant current driving chip U1 is a setting end of the second constant current driving module, a ground pin GND of the second constant current driving chip U1 is grounded, the current sampling module includes a sampling resistor RS1, a current sampling pin ISP of the second constant current driving chip U1 is grounded through the sampling resistor RS1, the overvoltage adjusting module includes an adjusting resistor R1, and the setting pin OVP of the second constant current driving chip is grounded through the adjusting resistor R1, the second filtering module comprises a second filtering capacitor CE1 and a load resistor R5, the anode of the second filtering capacitor CE1 is connected with one end of the power supply resistor R3 and one end of the load resistor R5, the cathode of the second filtering capacitor CE1 is connected with the other end of the load resistor R5, the energy storage module comprises an energy storage inductor L1 and a freewheeling diode D1, the first end of the energy storage inductor L1 is the first end of the energy storage module, the first end of the energy storage inductor L1 is further connected with the cathode of the second filtering capacitor CE1, the second end of the energy storage inductor L1 is the second end of the energy storage module, the second end of the energy storage inductor L1 is further connected with the anode of the freewheeling diode D1, and the cathode of the freewheeling diode D1 is connected with the anode of the second filtering capacitor CE 1; the second constant current driving chip U1 is a JWB1969 chip, but is not limited thereto;
The switch power supply induction control circuit further comprises a color temperature switching circuit, the color temperature switching circuit comprises a dial switch SW1 and a switch filtering module, the dial switch SW1 comprises a first end and two second ends, the LED module comprises two LED units, the two LED units emit light with different color temperatures, the second ends of the dial switch SW1 and the LED units are in one-to-one correspondence, and the second ends of the dial switch SW1 and the switch filtering module are in one-to-one correspondence; each second end of the dial switch SW1 is connected to the corresponding LED unit, and each second end of the dial switch SW1 is connected to the first end of the dial switch SW1 through the corresponding switch filter module; the first end of the dial switch SW1 is further connected with the power supply end of the constant current driving circuit 2, or the first end of the dial switch SW1 is further connected with the current input end of the constant current driving circuit 2; the dial switch SW1 is used for controlling the connection and disconnection between the first end and each second end of the dial switch SW1 so as to switch the color temperature of the LED module, and the switch filtering module is used for filtering out noise waves generated by shifting the dial switch SW 1; wherein the LED unit comprises at least one light emitting diode; the number of the second end of the dial switch SW1, the number of the LED units and the number of the filter modules may be set according to the actual use situation, and the embodiment only takes two as an example, but is not limited thereto.
In this embodiment, the first sensing module collects a first sensing signal and controls the output state of the constant current driving circuit 2 according to the first sensing signal, so as to control the on/off of the LED module 4; when the first sensing module is used for collecting light sensing signals, when the collected light sensing signals are larger than a preset threshold value, a high level is output, the constant current driving circuit 2 does not output, the LED module is turned off, otherwise, the constant current driving circuit 2 outputs, and the LED module is turned on; when the first sensing module is used for collecting human body sensing signals, corresponding signals are output when the first sensing module collects the human body sensing signals, namely when it is monitored that a person passes through a sensing area, so that the constant current driving circuit 2 keeps outputting, the LED module is lightened, otherwise, the constant current driving circuit 2 is disconnected from outputting, and the LED module is extinguished; meanwhile, the color temperature of the LED module can be switched through the dial switch SW1 to adapt to different scene requirements; therefore, adopt this embodiment, can realize light sense control or human body sensing control automatically, need not to carry out complicated manual mechanical control to satisfy the demand of different use scenes, have circuit structure simple and advantage with low costs simultaneously.
As shown in fig. 3, a second embodiment of the present invention is provided;
the power supply circuit 3 comprises a power supply input end (L and N wiring terminals) and an anti-surge module (fuse resistors FR1 and FR2 and a voltage dependent resistor VR1), wherein the power supply input end is connected with one end of the anti-surge module, and the other end of the anti-surge module is an output end of the power supply circuit; of course, this is only one specific embodiment of the power supply circuit 3, and the power supply circuit of this embodiment may also adopt other embodiments to implement the function of supplying power to the constant current driving circuit 2, which is not limited in the present invention.
The constant current driving circuit comprises a first constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, wherein the power supply input end of the first constant current driving module is connected with the output end of the power supply circuit 3, the power supply end of the first constant current driving module is the power supply end of the constant current driving circuit 2, the current sampling end of the first constant current driving module is grounded through the current sampling module, the setting end of the first constant current driving module is grounded through the overvoltage regulating module, the setting end of the first constant current driving module is the signal input end of the constant current driving circuit 2, the first end of the energy storage module is the current input end of the constant current driving circuit 2, the second end of the energy storage module is connected with the current input end of the first constant current driving module, one end of the second filtering module is connected with the power supply end of the first constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module. Specifically, the first constant current driving module includes a first constant current driving chip U1, a power input pin ACIN of the first constant current driving chip U1 is a power input end of the first constant current driving module, a power supply pin HV of the first constant current driving chip U1 is a power supply end of the first constant current driving module, a current sampling pin CS of the first constant current driving chip U1 is a current sampling end of the first constant current driving module, a setting pin OVP of the first constant current driving chip U1 is a setting end of the first constant current driving module, a ground pin GND of the first constant current driving chip U1 is grounded, the current sampling module includes a sampling resistor RS1, the current sampling pin CS of the first constant current driving chip U1 is grounded through the sampling resistor RS1, the overvoltage adjusting module includes an adjusting resistor R1, the setting pin OVP of the first constant current driving chip U1 is grounded through the adjusting resistor R1, the second filtering module comprises a second filtering capacitor CE3 and a load resistor R6, the anode of the second filtering capacitor CE3 is connected with the power supply pin HV of the first constant current driving chip U1 and one end of the load resistor R6 respectively, the cathode of the second filtering capacitor CE3 is connected with the other end of the load resistor R6, the energy storage module comprises an energy storage inductor L1, the first end of the energy storage inductor L1 is the first end of the energy storage module, the first end of the energy storage inductor L1 is also connected with the cathode of the second filtering capacitor CE3, and the second end of the energy storage inductor L1 is the second end of the energy storage module; the first constant current driving chip U1 is MT7771, but is not limited thereto;
the first sensing circuit 1 comprises a first sensing module J1, a voltage stabilizing module and a first filtering module, wherein a power supply input end of the voltage stabilizing module is a power supply input end of the first sensing circuit 1, an output end of the voltage stabilizing module is grounded through the first filtering module, an output end of the voltage stabilizing module is further connected with a power supply input end VCC of the first sensing module J1, an output end OUT1 of the first sensing module J1 is an output end of the first sensing circuit 1, and a ground end GND of the first sensing module J1 is grounded; the voltage stabilizing module comprises a voltage stabilizing chip U2, a third voltage dividing resistor R2 and a fourth voltage dividing resistor R3, one end of the third voltage dividing resistor R2 is a power input end of the voltage stabilizing module, and the other end of the third voltage dividing resistor R2 and a voltage input pin V of the voltage stabilizing chip U2inConnected to and grounded via the fourth voltage dividing resistor R3, and the output pin V of the voltage stabilizing chip U2outIs the output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor R4, a second filtering resistor R5 and a first filtering capacitor (C1 and CE2 are connected in parallel), and a voltage output pin V of the voltage stabilizing chip U2outThe voltage regulation circuit is connected with one end of the first filter resistor R4 and one end of the first filter capacitor respectively, the other end of the first filter resistor R4 is connected with one end of the second filter resistor R5 and a voltage regulation pin ADJ of the voltage regulation chip U2 respectively, and the other end of the second filter resistor R5 is connected with the other end of the first filter capacitor and the ground respectively; the voltage stabilizing module is used for providing proper working voltage for the first induction circuit and the second induction circuit, and the first filtering module is used for filtering noise waves in the circuits and improving the stability of power supply; the voltage regulation chip U2 may be an AMS1117 chip, but is not limited thereto, and may be an appropriate one according to actual conditions.
The switching power supply induction control circuit further comprises a second induction circuit, the second induction circuit comprises a second induction module J2 and a switching module, a power supply input end VCC of the second induction module J2 is connected with a power supply end of the constant current driving circuit 2, an output end OUT2 of the second induction module J2 is connected with a control end of the switching module, and a ground end GND of the second induction module J2 is grounded; the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the LED module 4, and the specific expression is as follows: the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the switch module and the LED module 4, and as can be understood, the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the switch module and the LED module 4 in sequence, or the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the LED module 4 and the switch module in sequence; the second sensing module J2 is configured to control on/off of the switch module according to a collected second sensing signal, so as to control on/off of the LED module 4; the first sensing signal and the second sensing signal are both light sensing signals or human body sensing signals, and the first sensing signal and the second sensing signal are different types of sensing signals. Specifically, the switch module comprises a switch tube unit and a second induction voltage division unit, a first end of the second induction voltage division unit is a control end of the switch module, a second end of the second induction voltage division unit is connected with the control end of the switch tube unit, a third end of the second induction voltage division unit is respectively connected with a current input end of the constant current driving circuit 2 and a first output end of the switch tube unit, the first input end and the second input end of the switch tube unit are both connected with a power supply end of the constant current driving circuit 2, and a second output end of the switch tube unit is connected with the current input end of the constant current driving circuit 2 through the LED module 4; the switching tube unit controls the on-off between the second input end and the second output end of the switching tube unit according to the second sensing signal collected by the second sensing module, so that the on-off of the LED module is controlled. Specifically, the second sensing voltage division unit comprises a seventh voltage division resistor R9 and an eighth voltage division resistor R10, and the switching tube unit comprises a first N-channel MOS transistor Q1, a second N-channel MOS transistor Q2, a ninth voltage division resistor R7, a tenth voltage division resistor R8 and a first capacitor C2; one end of the seventh voltage-dividing resistor R9 is a first end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor R9 is a second end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor R9 is further connected with one end of the eighth voltage-dividing resistor R10, and the other end of the eighth voltage-dividing resistor R10 is a third end of the second sensing voltage-dividing unit; the grid electrode of the first N-channel MOS tube Q1 is the control end of the switch tube unit, the source electrode of the first N-channel MOS tube Q1 is the first output end of the switch tube unit, the drain of the first N-channel MOS transistor Q1 is connected to the gate of the second N-channel MOS transistor Q2 and one end of a ninth voltage-dividing resistor R7, one end of the ninth voltage-dividing resistor R7 is further connected to the source of the first N-channel MOS transistor Q1 through the tenth voltage-dividing resistor R8, the other end of the ninth voltage-dividing resistor R7 is a first input end of the switching tube unit, the source of the second N-channel MOS transistor Q2 is a second output end of the switching tube unit, the drain of the second N-channel MOS transistor Q2 is the second input terminal of the switching tube unit, the source electrode of the second N-channel MOS tube Q2 is also connected with the drain electrode of the second N-channel MOS tube Q2 through the first capacitor C2; the seventh voltage-dividing resistor R9 and the eighth voltage-dividing resistor R10 play a role in voltage division, so as to avoid breakdown of the first N-channel MOS transistor Q1 due to excessively high voltage, and the ninth voltage-dividing resistor R7 and the tenth voltage-dividing resistor R8 play a role in voltage division, so as to avoid breakdown of the second N-channel MOS transistor Q2 due to excessively high voltage. It should be noted that the switching tube unit of this embodiment may also be implemented by using a triode, as shown in the following fourth and fifth embodiments, which are not described herein again; of course, other switching transistors such as P-channel MOS transistors may also be used, which is not limited in the present invention. In addition, the types of the first sensing module and the second sensing module may be set according to actual use requirements, for example, an infrared sensor, a photosensitive sensor, a microwave sensor, and the like may be selected, which is not limited in the present invention.
The LED module comprises at least one light emitting diode. In addition, the switching power supply sensing control circuit may further include the color temperature switching circuit according to the first embodiment, which is not described herein again.
In this embodiment, the first sensing module is a light sensing module, and the second sensing module is a microwave sensing module, but not limited thereto; the first sensing module J1 is used for collecting a first sensing signal and controlling the output state of the constant current driving circuit according to the first sensing signal, and the second sensing module J2 is used for collecting a second sensing signal and controlling the on-off of the switch module according to the second sensing signal, so that the on-off of the LED module is controlled. When the light sensing signal collected by the first sensing module J1 is greater than a preset threshold, a high level is output, the constant current driving circuit 2 does not output, and the LED module 4 is turned off; when the light sensing signal collected by the first sensing module J1 is not greater than a preset threshold value, a low level is output, the constant current driving circuit 2 outputs, at this time, if the human body sensing signal collected by the second sensing module J2, that is, it is monitored that a person passes through a sensing area, the low level is output, the first N-channel MOS transistor Q1 is turned off, the second N-channel MOS transistor Q2 is turned on, the LED module is turned on, otherwise, the first N-channel MOS transistor Q1 is turned on, the second N-channel MOS transistor Q2 is turned off, and the LED module is turned off; therefore, the LED lamp can be switched on and off in multiple induction modes, and the requirements of different use scenes can be met. In addition, it should be noted that, in this embodiment, only the first sensing circuit may be provided instead of the second sensing circuit, as shown in the first embodiment, which is not described herein again.
As shown in fig. 4, a third embodiment of the present invention is provided;
it should be noted that the third embodiment is different from the second embodiment in the switch module;
the switch module comprises a switch tube unit and a second induction voltage division unit; the first end of the second induction voltage division unit is a control end of the switch module, the second end of the second induction voltage division unit is connected with the control end of the switch tube unit, the first input end of the switch tube unit is connected with the power supply end of the constant current driving circuit 2, and the second input end of the switch tube unit is connected with the output end of the LED module 4; the third end of the second sensing voltage division unit, the first output end and the second output end of the switching tube unit are respectively connected with the current input end of the constant current driving circuit 2, or the third end of the second sensing voltage division unit and the first output end of the switching tube unit are grounded, and the second output end of the switching tube unit is connected with the current input end of the constant current driving circuit 2, as shown in fig. 4; the switching tube unit controls the on-off between the second input end and the second output end of the switching tube unit according to the second sensing signal collected by the second sensing module, so that the on-off of the LED module is controlled. Specifically, the second sensing voltage division unit comprises a seventh voltage division resistor R9 and an eighth voltage division resistor R10, and the switching tube unit comprises a first N-channel MOS transistor Q1, a second N-channel MOS transistor Q2, a ninth voltage division resistor R7, a tenth voltage division resistor R8 and a first capacitor C2; one end of the seventh voltage-dividing resistor R9 is a first end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor R9 is a second end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor R9 is further connected with one end of the eighth voltage-dividing resistor R10, and the other end of the eighth voltage-dividing resistor R10 is a third end of the second sensing voltage-dividing unit; the grid electrode of the first N-channel MOS tube Q1 is the control end of the switch tube unit, the source electrode of the first N-channel MOS tube Q1 is the first output end of the switch tube unit, the drain of the first N-channel MOS transistor Q1 is connected to the gate of the second N-channel MOS transistor Q2 and one end of a ninth voltage-dividing resistor R7, one end of the ninth voltage-dividing resistor R7 is further connected to the source of the first N-channel MOS transistor Q1 through the tenth voltage-dividing resistor R8, the other end of the ninth voltage-dividing resistor R7 is a first input end of the switching tube unit, the source of the second N-channel MOS transistor Q2 is a second output end of the switching tube unit, the drain of the second N-channel MOS transistor Q2 is the second input terminal of the switching tube unit, the source electrode of the second N-channel MOS tube Q2 is also connected with the drain electrode of the second N-channel MOS tube Q2 through the first capacitor C2; the seventh voltage-dividing resistor R9 and the eighth voltage-dividing resistor R10 play a role in voltage division, so as to avoid breakdown of the first N-channel MOS transistor Q1 due to excessively high voltage, and the ninth voltage-dividing resistor R7 and the tenth voltage-dividing resistor R8 play a role in voltage division, so as to avoid breakdown of the second N-channel MOS transistor Q2 due to excessively high voltage.
As shown in fig. 5, a fourth embodiment of the present invention is provided;
the power supply circuit 3 comprises a power supply input end (connecting terminals N and L), surge prevention modules (FR1, FR2 and RV1), a rectification module (a rectification bridge DB1) and a third filtering module (CE1), wherein the power supply input end is connected with the input end of the rectification module through the surge prevention module, the output end of the rectification module is grounded through the third filtering module, and the output end of the rectification module is the output end of the power supply circuit 3; the anti-surge module is used for inhibiting surge voltage and current, and the rectification module is used for converting alternating current output by the power supply input end into direct current; of course, this is only one specific embodiment of the power supply circuit 3, and the power supply circuit of this embodiment may also adopt other embodiments to implement the function of supplying power to the constant current driving circuit 2, which is not limited in the present invention.
The first induction circuit 1 comprises a first induction module J2, a voltage stabilizing module and a first filtering module, wherein the power input end of the voltage stabilizing module is the power input end of the first induction circuit 1, the output end of the voltage stabilizing module is grounded through the first filtering module, the output end of the voltage stabilizing module is also connected with the power input end VCC of the first induction module J2, the output end OUT1 of the first induction module J2 is the output end of the first induction circuit 1, and the ground end GND of the first induction module J2 is grounded. Specifically, the voltage regulation module includes a voltage regulation chip U2, a third voltage dividing resistor R2 and a fourth voltage dividing resistor R3, one end of the third voltage dividing resistor R2 is a power input end of the voltage regulation module, and the other end of the third voltage dividing resistor R3 and a voltage input pin V of the voltage regulation chip U2inConnected to and grounded via the fourth voltage dividing resistor R3, and the output pin V of the voltage stabilizing chip U2outIs the output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor R4, a second filtering resistor R5 and a first filtering capacitor (C1 and/or CE2), and a voltage output pin V of the voltage stabilizing chip U2outThe voltage regulation circuit is connected with one end of the first filter resistor R4 and one end of the first filter capacitor respectively, the other end of the first filter resistor R4 is connected with one end of the second filter resistor R5 and a voltage regulation pin ADJ of the voltage regulation chip U2 respectively, and the other end of the second filter resistor R5 is connected with the other end of the first filter capacitor and the ground respectively; the voltage stabilizing module is used for providing proper working voltage for the first induction circuit, and the first filtering module is used for filtering noise waves in the circuit and improving the stability of power supply; wherein, the voltage stabilizing chip U2 is an AMS1117 chip, but is not limited thereto;
the constant current driving circuit 2 comprises a second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, wherein the power supply end of the second constant current driving module is the power supply end of the constant current driving circuit 2, the power supply end of the second constant current driving module is connected with the output end of the power supply circuit 3, the current sampling end of the second constant current driving module is grounded through the current sampling module, the setting end of the second constant current driving module is grounded through the overvoltage regulating module, the setting end of the second constant current driving module is the signal input end of the constant current driving circuit 2, the first end of the energy storage module is the current input end of the constant current driving circuit 2, the second end of the energy storage module is connected with the current input end of the second constant current driving module, one end of the second filtering module is connected with the power supply end of the second constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module. Specifically, the second constant current driving module includes a second constant current driving chip U1, a current sampling pin CS of the second constant current driving chip U1 is a current sampling end of the second constant current driving module, a setting pin ROVP of the second constant current driving chip U1 is a setting end of the second constant current driving module, a ground pin GND of the second constant current driving chip U1 is grounded, the current sampling module includes a sampling resistor RS2, the current sampling pin CS of the second constant current driving chip U1 is grounded through the sampling resistor RS2, the overvoltage adjusting module includes an adjusting resistor R6, the setting pin ROVP of the second constant current driving chip is grounded through the adjusting resistor R6, the second filtering module includes a second filtering capacitor CE3 and a load resistor R1, an anode of the second filtering capacitor CE3 is connected to one end of the load resistor R1, a cathode of the second filtering capacitor CE3 is connected to the other end of the load resistor R1, the energy storage module comprises an energy storage inductor L2 and a freewheeling diode D2, the first end of the energy storage inductor L2 is the first end of the energy storage module, the first end of the energy storage inductor L2 is also connected with the cathode of the second filter capacitor CE3, the second end of the energy storage inductor L2 is the second end of the energy storage module, the second end of the energy storage inductor L2 is also connected with the anode of the freewheeling diode D2, and the cathode of the freewheeling diode D2 is connected with the anode of the second filter capacitor CE 3; the second constant current driving chip U1 is a BP2866 chip, but is not limited thereto;
the second induction circuit comprises a second induction module J1 (a photosensitive sensor) and a switch module, the power supply input end of the second induction module J1 is connected with the power supply end of the constant current driving circuit 2, and the output end of the second induction module J1 is connected with the control end of the switch module; the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the LED module 4, and the specific expression is as follows: the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the LED module 4 and the switch module, and as can be understood, the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the switch module and the LED module 4 in sequence, or the power supply end of the constant current driving circuit 2 is connected with the current input end of the constant current driving chip U1 through the LED module 4 and the switch module in sequence; the second sensing module J1 is configured to control on/off of the switch module according to a collected second sensing signal, so as to control on/off of the LED module 4; the first sensing signal and the second sensing signal are both light sensing signals or human body sensing signals, and the first sensing signal and the second sensing signal are different types of sensing signals. Specifically, a first end of the second sensing voltage division unit is a control end of the switch module, a second end of the second sensing voltage division unit is connected with a control end of the switch tube unit, a third end of the second sensing voltage division unit is respectively connected with a current input end of the constant current driving circuit, a first output end and a second output end of the switch tube unit, the first input end of the switch tube unit is connected with a power supply end of the constant current driving circuit, and the second input end of the switch tube unit is connected with an output end of the LED module, as shown in fig. 5; in another embodiment, the switch module includes a switch tube unit and a second sensing voltage-dividing unit, a first end of the second sensing voltage-dividing unit is a control end of the switch module, a second end of the second sensing voltage-dividing unit is connected with the control end of the switch tube unit, a third end of the second sensing voltage-dividing unit is respectively connected with a current input end of the constant current driving circuit 2 and a first output end of the switch tube unit, the first input end and the second input end of the switch tube unit are both connected with a power supply end of the constant current driving circuit 2, and the second output end of the switch tube unit is connected with the current input end of the constant current driving circuit 2 through the LED module 4; the switching tube unit controls the on-off between the second input end and the second output end of the switching tube unit according to the second sensing signal collected by the second sensing module, so that the on-off of the LED module is controlled. Specifically, the second sensing voltage division unit comprises a seventh voltage division resistor R7 and an eighth voltage division resistor R8, and the switching tube unit comprises a first NPN type triode Q1, a second NPN type triode Q2, a second current limiting resistor R9 and a third current limiting resistor R10; one end of the seventh voltage-dividing resistor R7 is a first end of the second sensing voltage-dividing unit, one end of the seventh voltage-dividing resistor R7 is further connected with one end of the eighth voltage-dividing resistor R8, the other end of the seventh voltage-dividing resistor R7 is a third end of the second sensing voltage-dividing unit, and the other end of the eighth voltage-dividing resistor R8 is a second end of the second sensing voltage-dividing unit; a base electrode of the first NPN transistor Q1 is a control end of the switching tube unit, a collector electrode of the first NPN transistor Q1 is connected to one end of the second current-limiting resistor R9 and a base electrode of the second NPN transistor Q2, respectively, another end of the second current-limiting resistor R9 is a first input end of the switching tube unit, an emitter electrode of the first NPN transistor Q1 is a first output end of the switching tube unit, a collector electrode of the second NPN transistor Q2 is connected to one end of the third current-limiting resistor R10, another end of the third NPN resistor R10 is a second input end of the switching tube unit, and an emitter electrode of the second NPN transistor Q2 is a second output end of the switching tube unit; the seventh voltage dividing resistor R7 and the eighth voltage dividing resistor R8 have a voltage dividing function, so that the first NPN type triode Q1 is prevented from being broken down by an excessively high voltage, and the second current limiting resistor R9 and the third current limiting resistor R10 have a current limiting function, so that the first NPN type triode Q1 and the second NPN type triode Q2 are prevented from being burnt down by an excessively high current. It should be noted that the switching tube unit of this embodiment may also adopt an MOS tube, as shown in the second and third embodiments, which is not described herein again; of course, other switching tubes such as PNP-type triode can be used, which is not limited in the present invention. In addition, the types of the first sensing module and the second sensing module may be set according to actual use requirements, for example, an infrared sensor, a photosensitive sensor, a microwave sensor, and the like may be selected, which is not limited in the present invention.
The LED module comprises at least one light emitting diode. In addition, the switching power supply sensing control circuit may further include the color temperature switching circuit according to the first embodiment, which is not described herein again.
In this embodiment, the first sensing module is a microwave sensing module, and the second sensing module is a light sensing module, but not limited thereto; the first sensing module J2 is used for collecting a first sensing signal and controlling the output state of the constant current driving circuit according to the first sensing signal, and the second sensing module J1 is used for collecting a second sensing signal and controlling the on-off of the switch module according to the second sensing signal, so that the on-off of the LED module is controlled. When the first induction module J2 does not acquire a human body movement signal, the constant current driving circuit 2 does not output the human body movement signal, and the LED module 4 is turned off; when the first induction module J2 collects a human body movement signal, the constant current driving circuit 2 outputs a high level, the first NPN type triode Q1 is turned on, the second NPN type triode Q2 is turned off, and the LED module is turned off if the light induction signal collected by the second induction module J1 is greater than a preset threshold, otherwise, the first NPN type triode Q1 is turned off, the second NPN type triode Q2 is turned on, and the LED module is turned on, so that the light is turned on when the ambient light is insufficient and people come, and the light is automatically turned off when no people come; therefore, the LED lamp can be switched on and off in multiple induction modes, and the requirements of different use scenes can be met.
As shown in fig. 6, a fifth embodiment of the present invention is provided;
the power supply circuit 3 comprises a power input end (connecting terminals N and L), anti-surge modules (FR1 and RV1), a rectifying module (a rectifier bridge BR1) and a third filtering module (an N-shaped filtering circuit consisting of EC1, EC2, R13 and L1), wherein the power input end is connected with the input end of the rectifying module through the anti-surge module, the output end of the rectifying module is grounded through the third filtering module, and the output end of the rectifying module is the output end of the power supply circuit; the anti-surge module is used for inhibiting surge voltage and current, and the rectification module is used for converting alternating current output by the power supply input end into direct current. Of course, this is only one specific embodiment of the power supply circuit 3, and the power supply circuit of this embodiment may also adopt other embodiments to implement the function of supplying power to the constant current driving circuit 2, which is not limited in the present invention.
The constant current driving circuit 2 comprises a second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, wherein the power supply end of the second constant current driving module is the power supply end of the constant current driving circuit 2, the power supply end of the second constant current driving module is connected with the output end of the power supply circuit, the current sampling end of the second constant current driving module is grounded through the current sampling module, the setting end of the second constant current driving module is grounded through the overvoltage regulating module, the setting end of the second constant current driving module is the signal input end of the constant current driving circuit 2, the first end of the energy storage module is the current input end of the constant current driving circuit 2, the second end of the energy storage module is connected with the current input end of the second constant current driving module, and one end of the second filtering module is connected with the power supply end of the second constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module. Specifically, the second constant current driving module includes a second constant current driving chip U1, a starting resistor R1 and a starting capacitor C1, one end of the starting resistor R1 is a power supply end of the second constant current driving module, the other end of the starting resistor R1 is connected to a power supply pin VCC of the second constant current driving chip U1 and is grounded through the starting capacitor C1, a current sampling pin CS of the second constant current driving chip U1 is a current sampling end of the second constant current driving module, a setting pin ROVP of the second constant current driving chip U1 is a setting end of the second constant current driving module, a ground pin GND of the second constant current driving chip U1 is grounded, the current sampling module includes sampling resistors (R3 and R4 are connected in parallel), the current sampling pin CS of the second constant current driving chip U1 is grounded through the sampling resistors, the overvoltage adjusting module includes an adjusting resistor R2, the setting pin ROVP of the second constant current driving chip is grounded through the adjusting resistor R2, the second filtering module comprises a second filtering capacitor CE3 and a load resistor R5, the anode of the second filtering capacitor CE3 is respectively connected with one end of the starting resistor R1 and one end of the load resistor R5, the cathode of the second filter capacitor CE3 is connected with the other end of the load resistor R5, the energy storage module comprises an energy storage inductor T1 and a freewheeling diode D1, the first end of the energy storage inductor T1 is the first end of the energy storage module, the first end of the energy storage inductor T1 is further connected to the negative electrode of the second filter capacitor CE3, the second end of the energy storage inductor T1 is the second end of the energy storage module, the second end of the energy storage inductor T1 is further connected with the anode of the freewheeling diode D1, the cathode of the freewheeling diode D1 is connected with the anode of the second filter capacitor CE 3; the second constant current driving chip U1 is a BP2833 chip, but is not limited thereto;
the first induction circuit 1 comprises a first induction module PIR and a voltage stabilizing moduleThe power input end of the voltage stabilizing module is connected with the power input end VCC of the first induction module PIR and the power input end of the signal processing module, the output end of the first induction module is connected with the signal input end of the signal processing module, the signal output end of the signal processing module is connected with the output end of the first induction circuit 1, and the grounding end of the signal processing module and the grounding end of the first induction module are grounded. Specifically, the voltage regulation module includes a voltage regulation chip U2, a third voltage dividing resistor R6 and a fourth voltage dividing resistor R7, one end of the third voltage dividing resistor R6 is a power input end of the voltage regulation module, and the other end of the third voltage dividing resistor R6 and a voltage input pin V of the voltage regulation chip U2inConnected to and grounded via the fourth voltage dividing resistor R7, and the output pin V of the voltage regulator chip U2outIs the output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor R8, a second filtering resistor R9 and a first filtering capacitor (C2 and/or CE4), and a voltage output end V of the voltage stabilizing chip U2outThe voltage regulation circuit is connected with one end of the first filter resistor R8 and one end of the first filter capacitor respectively, the other end of the first filter resistor R8 is connected with one end of the second filter resistor R9 and a voltage regulation pin ADJ of the voltage regulation chip U2 respectively, and the other end of the second filter resistor R9 is connected with the other end of the first filter capacitor and the ground respectively; the signal processing module includes signal processing chip U3, first current-limiting resistor R10, fifth voltage-dividing resistor R11 and sixth voltage-dividing resistor R12, signal processing chip U3's power input pin VCC does signal processing module's power input end, signal processing chip U3's signal input pin with first current-limiting resistor R10's one end is connected, first current-limiting resistor R10's the other end does signal processing module's signal input end, signal processing chip U3's signal output pin PA3 with fifth voltage-dividing resistor R11's one end is connected, fifth voltage-dividing resistor R11's the other end passes through the fifth voltage-dividing resistor R3552The six resistor R12 is grounded, and the other end of the fifth resistor R11 is a signal output end OUT of the signal processing module; the first sensing module can be a pyroelectric detection sensor PIR, but is not limited to the pyroelectric detection sensor PIR; the voltage stabilizing chip U2 can be a chip with model number AMS1117, but is not limited to this, and a photosensitive sensor, a microwave sensor and the like can also be selected; the signal processing chip U3 may be a chip with a model F7701, but is not limited thereto, and an appropriate model may be selected according to actual situations.
The LED module comprises at least one light emitting diode. In addition, the switching power supply sensing control circuit may further include the color temperature switching circuit according to the first embodiment, which is not described herein again.
In this embodiment, when the pyroelectric detection sensor PIR monitors no person in the environment in real time, the pyroelectric detection sensor PIR outputs an electrical signal to the signal processing chip U3 and outputs a high-level trigger signal through the PA3 port of the U3 chip, the high-level signal triggers the OVP port of the U1 chip, the U1 chip is turned off for constant current output, and then the LED lamp is not turned on. When a person passes through the pyroelectric detection sensor PIR in a real-time monitoring environment, the pyroelectric detection sensor PIR outputs an electric signal to the processing chip U3 and outputs a low-level trigger signal through a PA3 port of the U3 chip, the low-level signal cannot trigger an OVP port of the U1 chip, the U1 chip outputs a constant current, and the LED lamp is turned on. The automatic lighting of people is realized, and the automatic lighting of nobody is turned off. In addition, it should be noted that the switching power supply sensing control circuit of this embodiment may further include a second sensing circuit, as shown in the second to fourth embodiments, which is not described herein again.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model.
Claims (10)
1. The switching power supply induction control circuit is characterized by comprising a power supply circuit, a constant current driving circuit, a first induction circuit and an LED module, wherein the power supply circuit is connected with the constant current driving circuit and used for supplying power to the constant current driving circuit; the power supply end of the constant current driving circuit is connected with the current input end of the constant current driving circuit through the LED module, the power supply end of the constant current driving circuit is also connected with the power supply input end of the first induction circuit, and the output end of the first induction circuit is connected with the signal input end of the constant current driving circuit; the first induction circuit is used for controlling the output state of the constant current driving circuit according to the collected first induction signal so as to control the on and off of the LED module; the first sensing signal is a light sensing signal or a human body sensing signal.
2. The switching power supply induction control circuit according to claim 1, wherein the first induction circuit comprises a first induction module and a first induction voltage dividing module, a first end of the first induction voltage dividing module is a power input end of the first induction circuit, a second end of the first induction voltage dividing module is connected with the power input end of the first induction module, a third end of the first induction voltage dividing module is grounded, an output end of the first induction module is an output end of the first induction circuit, and a ground end of the first induction module is grounded;
or the first sensing circuit comprises a first sensing module, a voltage stabilizing module and a first filtering module, wherein the power input end of the voltage stabilizing module is the power input end of the first sensing circuit, the output end of the voltage stabilizing module is grounded through the first filtering module, the output end of the voltage stabilizing module is also connected with the power input end of the first sensing module, the output end of the first sensing module is the output end of the first sensing circuit, and the grounding end of the first sensing module is grounded;
or the first induction circuit comprises a first induction module, a voltage stabilizing module, a first filtering module and a signal processing module, the power input end of the voltage stabilizing module is the power input end of the first induction circuit, the output end of the voltage stabilizing module is grounded through the first filtering module, the output end of the voltage stabilizing module is also connected with the power input end of the first induction module and the power input end of the signal processing module respectively, the output end of the first induction module is connected with the signal input end of the signal processing module, the signal output end of the signal processing module is the output end of the first induction circuit, and the grounding end of the signal processing module and the grounding end of the first induction module are both grounded.
3. The switching power supply sensing control circuit according to claim 2, wherein when the first sensing circuit comprises the first sensing module and a first sensing voltage dividing module, the first sensing voltage dividing module comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is a first end of the first sensing voltage dividing module, the other end of the first voltage dividing resistor is a second end of the first sensing voltage dividing module, the other end of the first voltage dividing resistor is further connected to one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is a third end of the first sensing voltage dividing module;
when the first sensing circuit comprises a first sensing module, a voltage stabilizing module and a first filtering module, the voltage stabilizing module comprises a voltage stabilizing chip, a third voltage dividing resistor and a fourth voltage dividing resistor, one end of the third voltage dividing resistor is a power supply input end of the voltage stabilizing module, the other end of the third voltage dividing resistor is connected with a voltage input pin of the voltage stabilizing chip and is grounded through the fourth voltage dividing resistor, and an output pin of the voltage stabilizing chip is an output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor, a second filtering resistor and a first filtering capacitor, a voltage output pin of the voltage stabilizing chip is respectively connected with one end of the first filtering resistor and one end of the first filtering capacitor, the other end of the first filtering resistor is respectively connected with one end of the second filtering resistor and a voltage adjusting pin of the voltage stabilizing chip, and the other end of the second filtering resistor is respectively connected with the other end of the first filtering capacitor and the ground;
when the first sensing circuit comprises a first sensing module, a voltage stabilizing module, a first filtering module and a signal processing module, the voltage stabilizing module comprises a voltage stabilizing chip, a third voltage dividing resistor and a fourth voltage dividing resistor, one end of the third voltage dividing resistor is a power supply input end of the voltage stabilizing module, the other end of the third voltage dividing resistor is connected with a voltage input pin of the voltage stabilizing chip and is grounded through the fourth voltage dividing resistor, and an output pin of the voltage stabilizing chip is an output end of the voltage stabilizing module; the first filtering module comprises a first filtering resistor, a second filtering resistor and a first filtering capacitor, the voltage output end of the voltage stabilizing chip is respectively connected with one end of the first filtering resistor and one end of the first filtering capacitor, the other end of the first filtering resistor is respectively connected with one end of the second filtering resistor and a voltage adjusting pin of the voltage stabilizing chip, and the other end of the second filtering resistor is respectively connected with the other end of the first filtering capacitor and the ground; the signal processing module comprises a signal processing chip, a first current-limiting resistor, a fifth voltage-dividing resistor and a sixth voltage-dividing resistor, a power input pin of the signal processing chip is a power input end of the signal processing module, a signal input pin of the signal processing chip is connected with one end of the first current-limiting resistor, the other end of the first current-limiting resistor is a signal input end of the signal processing module, a signal output pin of the signal processing chip is connected with one end of the fifth voltage-dividing resistor, the other end of the fifth voltage-dividing resistor is grounded through the sixth resistor, and the other end of the fifth resistor is a signal output end of the signal processing module.
4. The switching power supply induction control circuit according to any one of claims 1 to 3, further comprising a second induction circuit, wherein the second induction circuit comprises a second induction module and a switching module, a power supply input end of the second induction module is connected with a power supply end of the constant current driving circuit, an output end of the second induction module is connected with a control end of the switching module, a grounding end of the second induction module is grounded, and a power supply end of the constant current driving circuit is connected with a current input end of the constant current driving chip through the switching module and the LED module; the second sensing module is used for controlling the on-off of the switch module according to the collected second sensing signal so as to control the on-off of the LED module; the first sensing signal and the second sensing signal are both light sensing signals or human body sensing signals, and the first sensing signal and the second sensing signal are different types of sensing signals.
5. The switching power supply induction control circuit according to claim 4, wherein the switching module comprises a switching tube unit and a second induction voltage division unit;
the first end of the second induction voltage division unit is a control end of the switch module, the second end of the second induction voltage division unit is connected with the control end of the switch tube unit, the third end of the second induction voltage division unit is respectively connected with the current input end of the constant current driving circuit, the first output end and the second output end of the switch tube unit, the first input end of the switch tube unit is connected with the power supply end of the constant current driving circuit, and the second input end of the switch tube unit is connected with the output end of the LED module;
or the first end of the second induction voltage division unit is a control end of the switch module, the second end of the second induction voltage division unit is connected with the control end of the switch tube unit, the third end of the second induction voltage division unit is respectively connected with the current input end of the constant current driving circuit and the first output end of the switch tube unit, the first input end and the second input end of the switch tube unit are both connected with the power supply end of the constant current driving circuit, and the second output end of the switch tube unit is connected with the current input end of the constant current driving circuit through the LED module.
6. The switching power supply inductive control circuit according to claim 5, wherein the second inductive voltage dividing unit includes a seventh voltage dividing resistor and an eighth voltage dividing resistor, and the switching tube unit includes a first NPN transistor, a second current limiting resistor, and a third current limiting resistor; one end of the seventh voltage-dividing resistor is a first end of the second sensing voltage-dividing unit, one end of the seventh voltage-dividing resistor is further connected with one end of the eighth voltage-dividing resistor, the other end of the seventh voltage-dividing resistor is a third end of the second sensing voltage-dividing unit, and the other end of the eighth voltage-dividing resistor is a second end of the second sensing voltage-dividing unit; a base electrode of the first NPN type triode is a control end of the switching tube unit, a collector electrode of the first NPN type triode is respectively connected with one end of the second current-limiting resistor and a base electrode of the second NPN type triode, the other end of the second current-limiting resistor is a first input end of the switching tube unit, an emitter electrode of the first NPN type triode is a first output end of the switching tube unit, a collector electrode of the second NPN type triode is connected with one end of the third current-limiting resistor, the other end of the third current-limiting resistor is a second input end of the switching tube unit, and an emitter electrode of the second NPN type triode is a second output end of the switching tube unit;
or the second sensing voltage division unit comprises a seventh voltage division resistor and an eighth voltage division resistor, and the switching tube unit comprises a first N-channel MOS tube, a second N-channel MOS tube, a ninth voltage division resistor, a tenth voltage resistor and a first capacitor; one end of the seventh voltage-dividing resistor is a first end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor is a second end of the second sensing voltage-dividing unit, the other end of the seventh voltage-dividing resistor is further connected with one end of the eighth voltage-dividing resistor, and the other end of the eighth voltage-dividing resistor is a third end of the second sensing voltage-dividing unit; the grid of first N channel MOS pipe does the control end of switch tube unit, the source electrode of first N channel MOS pipe does the first output of switch tube unit, the drain electrode of first N channel MOS pipe respectively with the grid of second N channel MOS pipe and the one end of ninth divider resistance are connected, the one end of ninth divider resistance still passes through tenth divider resistance with the source electrode of first N channel MOS pipe is connected, the other end of ninth divider resistance is the first input of switch tube unit, the source electrode of second N channel MOS pipe does the second output of switch tube unit, the drain electrode of second N channel MOS pipe does the second input of switch tube unit, the source electrode of second N channel MOS pipe still pass through first electric capacity with the drain electrode of second N channel MOS pipe is connected.
7. The switching power supply induction control circuit according to any one of claims 1 to 3, wherein the constant current driving circuit comprises a first constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, a power supply input end of the first constant current driving module is connected with an output end of the power supply circuit, a power supply end of the first constant current driving module is a power supply end of the constant current driving circuit, a current sampling end of the first constant current driving module is grounded through the current sampling module, a setting end of the first constant current driving module is grounded through the overvoltage regulating module, a setting end of the first constant current driving module is a signal input end of the constant current driving circuit, a first end of the energy storage module is a current input end of the constant current driving circuit, and a second end of the energy storage module is connected with the current input end of the first constant current driving module, one end of the second filtering module is connected with the power supply end of the first constant current driving module, and the other end of the second filtering module is connected with the first end of the energy storage module;
or the constant current driving circuit comprises a second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, the power supply end of the second constant current driving module is the power supply end of the constant current driving circuit, the power supply end of the second constant current driving module is connected with the output end of the power supply circuit, the current sampling end of the second constant current driving module is grounded through the current sampling module, the setting end of the second constant current driving module is grounded through the overvoltage regulating module, the setting end of the second constant current driving module is the signal input end of the constant current driving circuit, the first end of the energy storage module is the current input end of the constant current driving circuit, the second end of the energy storage module is connected with the current input end of the second constant current driving module, and one end of the second filtering module is connected with the power supply end of the second constant current driving module, the other end of the second filtering module is connected with the first end of the energy storage module.
8. The switching power supply induction control circuit according to claim 7, wherein when the constant current driving circuit includes the first constant current driving module, the current sampling module, the overvoltage regulating module, the energy storage module and the second filtering module, the first constant current driving module includes a first constant current driving chip, a power input pin of the first constant current driving chip is a power input end of the first constant current driving module, a power supply pin of the first constant current driving chip is a power supply end of the first constant current driving module, a current sampling pin of the first constant current driving chip is a current sampling end of the first constant current driving module, a setting pin of the first constant current driving chip is a setting end of the first constant current driving module, a ground pin of the first constant current driving chip is grounded, the current sampling module includes a sampling resistor, the current sampling pin of the first constant current driving chip is grounded through the sampling resistor, the overvoltage adjusting module comprises an adjusting resistor, the setting pin of the first constant current driving chip is grounded through the adjusting resistor, the second filtering module comprises a second filtering capacitor and a load resistor, the anode of the second filtering capacitor is respectively connected with the power supply pin of the first constant current driving chip and one end of the load resistor, the cathode of the second filtering capacitor is connected with the other end of the load resistor,
the energy storage module comprises an energy storage inductor, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is also connected with the negative electrode of the second filter capacitor, the second end of the energy storage inductor is the second end of the energy storage module,
or the energy storage module comprises an energy storage inductor and a freewheeling diode, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is also connected with the negative electrode of the second filter capacitor, the second end of the energy storage inductor is the second end of the energy storage module, the second end of the energy storage inductor is also connected with the positive electrode of the freewheeling diode, and the negative electrode of the freewheeling diode is connected with the positive electrode of the second filter capacitor;
when the constant current driving circuit comprises a second constant current driving module, a current sampling module, an overvoltage adjusting module, an energy storage module and a second filtering module,
the second constant current driving module comprises a second constant current driving chip and a power supply resistor, one end of the power supply resistor is a power supply end of the second constant current driving module, the other end of the power supply resistor is connected with a power supply pin of the second constant current driving chip, a current sampling pin of the second constant current driving chip is a current sampling end of the second constant current driving module, a setting pin of the second constant current driving chip is a setting end of the second constant current driving module, a grounding pin of the second constant current driving chip is grounded, the current sampling module comprises a sampling resistor, a current sampling pin of the second constant current driving chip is grounded through the sampling resistor, the overvoltage adjusting module comprises an adjusting resistor, the setting pin of the second constant current driving chip is grounded through the adjusting resistor, and the second filtering module comprises a second filtering capacitor and a load resistor, the anode of the second filter capacitor is respectively connected with one end of the power supply resistor and one end of the load resistor, the cathode of the second filter capacitor is connected with the other end of the load resistor, the energy storage module comprises an energy storage inductor and a fly-wheel diode, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is also connected with the cathode of the second filter capacitor, the second end of the energy storage inductor is the second end of the energy storage module, the second end of the energy storage inductor is also connected with the anode of the fly-wheel diode, and the cathode of the fly-wheel diode is connected with the anode of the second filter capacitor,
or the second constant current driving module comprises a second constant current driving chip, a starting resistor and a starting capacitor, one end of the starting resistor is a power supply end of the second constant current driving module, the other end of the starting resistor is connected with a power supply pin of the second constant current driving chip and is grounded through the starting capacitor, a current sampling pin of the second constant current driving chip is a current sampling end of the second constant current driving module, a setting pin of the second constant current driving chip is a setting end of the second constant current driving module, a grounding pin of the second constant current driving chip is grounded, the current sampling module comprises a sampling resistor, a current sampling pin of the second constant current driving chip is grounded through the sampling resistor, the overvoltage adjusting module comprises an adjusting resistor, and a setting pin of the second constant current driving chip is grounded through the adjusting resistor, the second filtering module comprises a second filtering capacitor and a load resistor, the anode of the second filtering capacitor is respectively connected with one end of the starting resistor and one end of the load resistor, the cathode of the second filtering capacitor is connected with the other end of the load resistor, the energy storage module comprises an energy storage inductor and a freewheeling diode, the first end of the energy storage inductor is the first end of the energy storage module, the first end of the energy storage inductor is connected with the cathode of the second filtering capacitor, the second end of the energy storage inductor is the second end of the energy storage module, the second end of the energy storage inductor is connected with the anode of the freewheeling diode, and the cathode of the freewheeling diode is connected with the anode of the second filtering capacitor.
9. The switching power supply induction control circuit according to claim 7, wherein when the constant current driving circuit comprises the first constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, the power supply circuit comprises a power input end and an anti-surge module, the power input end is connected with one end of the anti-surge module, and the other end of the anti-surge module is an output end of the power supply circuit;
when the constant current driving circuit comprises the second constant current driving module, a current sampling module, an overvoltage regulating module, an energy storage module and a second filtering module, the power supply circuit comprises a power supply input end, an anti-surge module, a rectifying module and a third filtering module, the power supply input end is connected with the input end of the rectifying module through the anti-surge module, the output end of the rectifying module is grounded through the third filtering module, and the output end of the rectifying module is the output end of the power supply circuit; the anti-surge module is used for inhibiting surge voltage and current, and the rectification module is used for converting alternating current output by the power supply input end into direct current.
10. The inductive control circuit of any of claims 1-3, further comprising a color temperature switching circuit, said color temperature switching circuit comprising a dial switch and a switch filter module, said dial switch comprising a first terminal and at least two second terminals, said LED module comprising at least two LED units, at least two of said LED units emitting light at different color temperatures, said dial switch second terminals in a one-to-one correspondence with said LED units, said dial switch second terminals in a one-to-one correspondence with said switch filter module;
each second end of the dial switch is respectively connected with the corresponding LED unit, and each second end of the dial switch is also respectively connected with the first end of the dial switch through the corresponding switch filtering module;
the first end of the dial switch is also connected with the power supply end of the constant current driving circuit, or the first end of the dial switch is also connected with the current input end of the constant current driving circuit;
the dial switch is used for controlling connection and disconnection between the first end of the dial switch and each second end of the dial switch so as to switch the color temperature of the LED module, and the switch filtering module is used for filtering noise waves generated by shifting the dial switch.
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