CN217087786U - LED power supply circuit - Google Patents
LED power supply circuit Download PDFInfo
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- CN217087786U CN217087786U CN202220886005.9U CN202220886005U CN217087786U CN 217087786 U CN217087786 U CN 217087786U CN 202220886005 U CN202220886005 U CN 202220886005U CN 217087786 U CN217087786 U CN 217087786U
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Abstract
The utility model relates to a LED power supply circuit, it includes the power supply unit, temperature detecting element and the control unit, the input of power supply unit is coupled in order to input alternating current in alternating current power supply, LED lamp source is coupled to the output of power supply unit, the power supply unit is used for providing the constant current power supply for the LED lamp source, the output of temperature detecting element is coupled in the control unit, temperature detecting element is used for detecting LED power supply circuit's circuit temperature condition and output detected signal to the control unit, the input of control unit is coupled in order to receive detected signal in temperature detecting element, the output of control unit is coupled in the power supply unit, the control unit is used for according to detected signal result and output control signal to the power supply unit, control power supply unit is for LED lamp source power supply state. The LED power supply circuit has the advantages that the temperature condition in the LED power supply circuit is detected in real time, and the LED power supply circuit has the over-temperature protection function.
Description
Technical Field
The application relates to the technical field of power supply of electrical equipment, in particular to an LED power supply circuit.
Background
With the continuous development of modern lighting technology, the related technology of the LED becomes more and more important, and the LED light-emitting product is widely applied to life due to the characteristics of energy conservation, environmental protection, long service life, small volume, high light-emitting efficiency and the like.
The conventional LED power supply generally adopts a constant-current power supply circuit to provide stable continuous voltage for an LED lamp, and along with the increase of the working time of the LED, the temperature of the LED is increased due to the light emission, so that the temperature of the power supply circuit in the LED is increased, the circuit is easily burnt out due to overhigh temperature, and the LED is burnt out or is extinguished due to power failure. Therefore, there is a certain room for improvement.
SUMMERY OF THE UTILITY MODEL
In order to detect the temperature condition in the LED power supply circuit in real time and enable the LED power supply circuit to have an over-temperature protection function, the application provides the LED power supply circuit.
The application provides an LED power supply circuit adopts following technical scheme:
the input end of the power supply unit is coupled to an alternating current power supply to input alternating current, the output end of the power supply unit is coupled with an LED lamp source and used for providing a constant current power supply for the LED lamp source, the output end of the temperature detection unit is coupled to the control unit, the temperature detection unit is used for detecting the circuit temperature condition of the LED power supply circuit and outputting a detection signal to the control unit, the input end of the control unit is coupled to the temperature detection unit to receive the detection signal, the output end of the control unit is coupled to the power supply unit, the control unit is used for outputting the control signal to the power supply unit according to a detection signal result, and the control power supply unit controls the power supply state of the LED lamp source.
By adopting the technical scheme, the alternating current power supply outputs alternating current to the power supply unit, the power supply unit rectifies, converts and filters the alternating current to form a stable direct current constant current power supply and outputs the stable direct current constant current power supply to the LED lamp source, power supply for the LED lamp source is realized, after the constant current power supply is input into the LED lamp source, the LED lamp source works in a power-on mode, the working temperature condition generated by the LED lamp source during working to the power supply circuit is detected in real time through the temperature detection unit, a detection signal is formed and output to the control unit, when the working temperature of the LED power supply circuit is too high, the control unit outputs a control signal to the power supply unit to control the power supply unit to be in a circuit breaking state, power supply for the LED lamp source is stopped, the LED power supply circuit is in a circuit breaking state, the LED power supply circuit is further protected from being burnt out due to overhigh temperature, and the LED power supply circuit has an overtemperature protection function.
Optionally, the power supply unit includes a rectifying and voltage-stabilizing subunit, a transformer, and an output filter subunit, an input end of the rectifying and voltage-stabilizing subunit is coupled to the ac power supply voltage, an output end of the rectifying and voltage-stabilizing subunit is coupled to a primary end of the transformer, a secondary end of the transformer is coupled to the output filter subunit, and another end of the output filter subunit is coupled to the LED light source.
By adopting the technical scheme, the alternating current power supply outputs alternating current voltage to enter the rectifying and voltage stabilizing subunit, the rectifying and voltage stabilizing subunit converts the input alternating current voltage into direct current voltage, the direct current voltage is subjected to voltage stabilizing and filtering treatment to form constant and stable direct current voltage, the constant and stable direct current voltage is output to the transformer, the transformer is subjected to voltage transformation and voltage reduction treatment on the direct current voltage to form direct current for the LED lamp source to work, the direct current is subjected to filtering treatment through the output filtering subunit to form constant direct current, the constant direct current is output to the LED lamp source, and stable constant current is provided for the LED lamp source.
Optionally, the rectifying and voltage-stabilizing subunit includes a first ac input end, a second ac input end, an anode output end and a cathode output end, the first ac input end is coupled to the live wire, the second ac input end is coupled to the zero line, and the anode output end and the cathode output end are coupled to the primary of the transformer to output dc voltage.
By adopting the technical scheme, the first alternating current input end and the second alternating current input end of the rectifying and voltage-stabilizing subunit receive alternating current voltage, and the positive output end of the rectifying and voltage-stabilizing subunit outputs direct current voltage to the transformer, so that the function of converting alternating current into direct current for output is realized.
Optionally, the temperature detecting unit includes a detecting subunit, a comparing subunit and a switch subunit, the detecting subunit is used for detecting the circuit temperature condition of the LED power supply circuit and outputting a temperature detection signal, the comparing subunit is coupled to the detecting subunit, the comparing subunit is provided with a temperature signal threshold, when the temperature detection signal is greater than the temperature signal threshold, the comparing subunit outputs a temperature comparison signal, the input end of the switch subunit is coupled to the comparing subunit, the output end of the switch subunit is coupled to the control unit, and the switch subunit outputs a start signal to the control unit when being used for receiving the temperature comparison signal, so as to trigger the start control unit.
By adopting the technical scheme, after the LED lamp source is electrified to work, the detection subunit detects the temperature condition of the LED power supply circuit in real time and forms a temperature detection signal, when the temperature of the LED power supply circuit rises, the temperature detection signal increases, when the temperature detection signal is greater than the temperature signal threshold value set by the comparison subunit, the comparison subunit outputs a temperature comparison signal to the switch subunit, the switch subunit outputs a starting signal to the control unit when receiving the temperature comparison signal, so that the control unit starts to work, further the power supply unit is controlled, and the temperature condition of the LED power supply circuit is detected in real time.
Optionally, the detecting subunit includes a thermistor NTC and a first resistor R1, the thermistor NTC is connected in series with the first resistor R1, the other end of the thermistor NTC is coupled to the power voltage, the other end of the first resistor R1 is grounded, and a connection node between the thermistor NTC and the first resistor R1 is coupled to the comparing subunit.
By adopting the technical scheme, the temperature condition in the LED power supply circuit is detected through the thermistor NTC, when the temperature of the LED power supply circuit rises, the resistance value of the thermistor NTC changes, the resistance value of the thermistor NTC decreases, the voltages at two ends of the first resistor R1 change, the high level is output to the comparison subunit by the connection node of the first resistor R1 and the thermistor NTC, the output temperature detection signal increases, and the temperature detection function is realized.
Optionally, the comparing subunit includes a comparator N1, a first input terminal of the comparator N1 is coupled to a connection node between the thermistor NTC and the first resistor R1, a second input terminal of the comparator N1 is coupled to a threshold voltage for inputting the temperature signal threshold, and an output terminal of the comparator N1 is coupled to the switching subunit.
By adopting the technical scheme, when the temperature in the LED power supply circuit rises, the first input end of the comparator N1 inputs a high level, the voltage input by the first input end of the comparator N1 is greater than the threshold voltage input by the second input end of the comparator N1, the temperature detection signal is greater than the temperature signal threshold, the output end of the comparator N1 outputs a high level, and the comparison subunit outputs a temperature comparison signal to the switch subunit.
Optionally, the switch subunit includes a first triode Q1, a light emitting diode D, and a photoelectric switch Q, a base of the first triode Q1 is coupled to the output end of the comparator N1, a collector of the first triode Q1 is coupled to the power voltage after being connected in series with the light emitting diode D, an emitter of the first triode Q1 is grounded, the photoelectric switch Q is coupled to the light emitting diode D, a collector of the photoelectric switch Q is coupled to the power voltage after being coupled to the control unit, and an emitter of the photoelectric switch Q is grounded.
Through adopting above-mentioned technical scheme, when the switch subunit received the temperature comparison signal, first triode Q1's base input high level, and first triode Q1 switches on, and emitting diode D circular telegram is lighted, output infrared off signal, and photoelectric coupling pipe Q is the conducting state after receiving infrared light signal, and photoelectric switching pipe Q's collecting electrode output low level, switching unit output start signal realizes starting the control unit function.
Optionally, the control unit includes a chip U1, a second transistor Q2, and a relay KM1, an input terminal of the chip U1 is coupled to a collector of the photoelectric switch Q, an output terminal of the chip U1 is coupled to a base of the second transistor Q2, a collector of the second transistor Q2 is coupled to a power supply voltage after being connected in series with a coil portion of the relay KM1, an emitter of the second transistor Q2 is grounded, the relay KM1 includes a normally closed contact switch KM1-1, and the normally closed contact switch KM1-1 is coupled to the power supply unit.
Through adopting above-mentioned technical scheme, when the control unit received the enabling signal, the input low level of chip U1, the output high level of chip U1 is exported to second triode Q2, the high level is imported to the base of second triode Q2, second triode Q2 switches on, relay KM 1's coil part circular telegram, make the circular close contact switch circular telegram be off-state, the control unit outputs control signal to the power supply unit, the control power supply unit disconnection stops to supply power for the LED lamp source, make LED supply circuit realize the excess temperature protection.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the LED lamp power supply circuit comprises a power supply unit, a temperature detection unit, a control unit, a power supply unit and a control unit, wherein the power supply unit is used for forming a stable direct current constant current power supply and outputting the stable direct current constant current power supply to an LED lamp source to supply power to the LED lamp source;
2. the rectification voltage-stabilizing subunit converts the alternating current into direct current, the transformer reduces the direct current to the direct current meeting the work requirement of the LED lamp source, and the output filtering subunit forms stable and constant direct current to be supplied to the LED lamp source so as to provide stable constant current;
3. when the LED lamp source is electrified to work, the detection subunit detects the temperature condition of the LED power supply circuit in real time and forms a temperature detection signal, when the temperature of the LED power supply circuit rises, the temperature detection signal increases, when the temperature detection signal is greater than a temperature signal threshold value set by the comparison subunit, the comparison subunit outputs a temperature comparison signal to the switch subunit, and the switch subunit outputs a starting signal to the control unit when receiving the temperature comparison signal, so that the control unit starts to work, the power supply unit is controlled, and the temperature condition of the LED power supply circuit is detected in real time.
Drawings
Fig. 1 is a block diagram of a structure of an LED power supply circuit according to an embodiment of the present application.
Fig. 2 is a circuit diagram of an LED power supply circuit according to an embodiment of the present application.
Description of reference numerals: 1. a power supply unit; 11. a rectifying and voltage-stabilizing subunit; 12. a transformer; 13 output filtering subunit; 2. a temperature detection unit; 21. a detection subunit; 22. a comparison subunit; 23. a switch subunit; 3. a control unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses an LED power supply circuit.
Referring to fig. 1 and 2, an LED power supply circuit includes a power supply unit 1, a temperature detection unit 2, and a control unit 3, where the power supply unit 1 includes a rectifying and voltage-stabilizing subunit 11, a transformer 12, and an output filter subunit 13, an input end of the rectifying and voltage-stabilizing subunit 11 is coupled to an ac power supply, an output end of the rectifying and voltage-stabilizing subunit 11 is coupled to a primary end of the transformer 12, one end of the output filter subunit 13 is coupled to a secondary end of the transformer 12, and the other end of the output filter subunit 13 is coupled to an LED light source, and the power supply unit 1 is configured to provide a stable constant current for the LED light source. The output end of the temperature detection unit 2 is coupled to the control unit 3 to output a detection signal to the control unit 3, and the output end of the control unit 3 is coupled to the power supply unit 1, specifically, when the control unit 3 receives the detection signal, the control unit 3 outputs a control signal to the power supply unit 1 to control the power on/off state of the power supply unit 1.
The rectifying and voltage-stabilizing subunit 11 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, an anode of the first diode D1 is coupled to a cathode of the second diode D2, an anode of the second diode D2 is coupled to an anode of the third diode D3, a cathode of the third diode D3 is coupled to an anode of the fourth diode D4, a cathode of the fourth diode D4 is coupled to a cathode of the first diode D1, a first ac input terminal of the rectifying and voltage-stabilizing subunit 11 is a connection node of the first diode D1 and the second diode D2, a second ac input terminal of the rectifying and voltage-stabilizing subunit 11 is a connection node of the third diode D3 and the fourth diode D4, an anode output terminal of the rectifying and voltage-stabilizing subunit 11 is a connection node of the second diode D2 and the third diode D3, a cathode output terminal of the rectifying and voltage-stabilizing subunit 11 is a connection node of the first diode D1 and the fourth diode D4, the connection node of the first diode D1 and the second diode D2 is coupled to the live wire terminal of the ac power source, the connection node of the third diode D3 and the fourth diode D4 is coupled to the neutral wire terminal of the ac power source, the connection node of the second diode D2 and the third diode D3 is coupled to one end of the primary of the transformer 12, and the connection node of the first diode D1 and the fourth diode D4 is coupled to the other end of the primary of the transformer 12.
The output filter subunit 13 includes a zener diode D5 and a first capacitor C1, an anode of the zener diode D5 is coupled to one end of the secondary side of the transformer 12, one end of the first capacitor C1 is coupled to a cathode of the zener diode D5, the other end of the first capacitor C1 is coupled to the other end of the secondary side of the transformer 12, and a connection node between the zener diode D5 and the first capacitor C1 and a connection node between the first capacitor C1 and the secondary side of the transformer 12 are coupled to the LED light source.
The temperature detection unit 2 includes a detection subunit 21, a comparison subunit 22, and a switch subunit 23. The detection subunit 21 is configured to detect a circuit temperature condition of the LED power supply circuit and output a temperature detection signal. The detecting sub-unit 21 includes a thermistor NTC and a first resistor R1, the thermistor NTC is connected in series with the first resistor R1, the other end of the thermistor NTC is coupled to the power voltage, the other end of the first resistor R1 is grounded, and the connection node between the thermistor NTC and the first resistor R1 is coupled to the comparing sub-unit 22.
The comparing subunit 22 is coupled to the detecting subunit 21 for receiving the temperature detection signal, the comparing subunit 22 is configured with a temperature signal threshold, and the comparing subunit 22 outputs a temperature comparison signal when the temperature detection signal is greater than the temperature signal threshold. The comparator subunit 22 includes a comparator N1, a first input terminal of the comparator N1 is a positive phase input terminal, a second input terminal of the comparator N1 is an inverse phase input terminal, the positive phase input terminal of the comparator N1 is coupled to a connection node between the thermistor NTC and the first resistor R1, the inverse phase input terminal of the comparator N1 is coupled to the threshold voltage VREF for inputting the temperature signal threshold, and an output terminal of the comparator N1 is coupled to the switch subunit 23.
The input end of the switch subunit 23 is coupled to the comparison subunit 22 for receiving the temperature comparison signal, and the output end of the switch subunit 23 is coupled to the control unit 3 for outputting the start signal to the control unit 3. The switch subunit 23 includes an NPN-type first transistor Q1, a light emitting diode D, and a photo switch Q, wherein a base of the first transistor Q1 is coupled to the output terminal of the comparator N1, a collector of the first transistor Q1 is coupled to the power voltage after being connected in series with the light emitting diode D, an emitter of the first transistor Q1 is grounded, the photo switch Q is coupled to the light emitting diode D, a collector of the photo switch Q is coupled to the power voltage after being coupled to the control unit 3, and an emitter of the photo switch Q is grounded.
The control unit 3 comprises a chip U1, an NPN-type second triode Q2 and a relay KM1, the chip U1 comprises eight pins, a second pin of the chip U1 is an input terminal, a third pin of the chip U1 is an output terminal, a first pin of the chip U1 is grounded, a second pin of the chip U1 is coupled to a collector of the photoelectric switching tube Q, a third pin of the chip U1 is coupled to a base of the second triode Q2, a fourth pin and an eighth pin of the chip U1 are both coupled to a power supply voltage, a fifth pin of the chip U1 is coupled to a second capacitor C2, the other end of the second capacitor C2 is grounded, and a sixth pin of the chip U1 is sequentially connected in series to a second resistor R2 and a third resistor R3. The other end of the third resistor R3 is coupled to a power supply voltage, the collector of the second transistor Q2 is coupled to the power supply voltage after being connected in series with the coil of the relay KM1, the emitter of the second transistor Q2 is grounded, the relay KM1 includes a normally closed contact switch KM1-1, and the normally closed contact switch KM1-1 is coupled between the positive output end of the rectifying and voltage-stabilizing subunit 11 and the primary of the transformer 12.
The implementation principle of the LED power supply circuit in the embodiment of the application is as follows:
the alternating current power supply outputs alternating current voltage to enter a rectifying and voltage-stabilizing subunit 11, the rectifying and voltage-stabilizing subunit 11 converts the input alternating current voltage into direct current voltage, and performs voltage-stabilizing filtering processing on the direct current voltage to form constant and stable direct current voltage to be output to a transformer 12, the transformer 12 performs voltage-transforming and voltage-reducing processing on the direct current voltage to form direct current meeting the work requirement of the LED lamp source, and an output filtering subunit 13 performs filtering processing on the direct current to form constant direct current to be output to the LED lamp source, so that the power supply unit 1 provides stable constant current for the LED lamp source;
when the LED lamp source is powered on to work, the detection subunit 21 detects the temperature condition of the LED power supply circuit in real time and forms a temperature detection signal, when the temperature in the LED power supply circuit increases, the resistance value of the thermistor NTC decreases, the voltage at two ends of the first resistor R1 changes, the connection node of the first resistor R1 and the thermistor NTC outputs a high level to the comparison subunit 22, and the temperature detection signal increases;
a positive phase input end of the comparator N1 inputs a high level, a voltage input at a positive phase input end of the comparator N1 is larger than a threshold voltage input at a negative phase input end of the comparator N1, an output end of the comparator N1 outputs a high level, the comparator subunit 22 outputs a temperature comparison signal to the switch subunit 23, a base electrode of the NPN type first triode Q1 inputs a high level, the first triode Q1 is conducted, the light emitting diode D is electrified and lightened, an infrared off signal is output, the photoelectric coupling tube Q is in a conducting state after receiving an infrared light signal, a collector electrode of the photoelectric switching tube Q outputs a low level, a second pin of the chip U1 inputs a low level, a third pin of the chip U1 outputs a high level, a base electrode of the NPN type second triode Q2 inputs a high level, the second triode Q2 is conducted, a coil part of the KM1 is electrified, the normally closed contact switch is electrified and is in an off state, and the rectifying and stabilizing subunit 11 and the primary side of the transformer 12 are in an off state, the power supply unit 1 is disconnected to stop supplying power to the LED lamp source, and the LED power supply circuit achieves the over-temperature protection function.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. An LED power supply circuit, characterized by: the LED lamp comprises a power supply unit (1), a temperature detection unit (2) and a control unit (3), wherein the input end of the power supply unit (1) is coupled with an alternating current power supply to input alternating current, the output end of the power supply unit (1) is coupled with an LED lamp source, the power supply unit (1) is used for providing a constant current power supply for the LED lamp source, the output end of the temperature detection unit (2) is coupled with the control unit (3), the temperature detection unit (2) is used for detecting the circuit temperature condition of the LED power supply circuit and outputting a detection signal to the control unit (3), the input end of the control unit (3) is coupled with the temperature detection unit (2) to receive the detection signal, the output end of the control unit (3) is coupled with the power supply unit (1), and the control unit (3) is used for outputting a control signal to the power supply unit (1) according to the detection signal result, and controlling the power supply unit (1) to supply power to the LED lamp source.
2. The LED power supply circuit of claim 1, wherein: the power supply unit (1) comprises a rectifying and voltage-stabilizing subunit (11), a transformer (12) and an output filtering subunit (13), wherein the input end of the rectifying and voltage-stabilizing subunit (11) is coupled to an alternating current power supply voltage, the output end of the rectifying and voltage-stabilizing subunit (11) is coupled to the primary end of the transformer (12), the secondary end of the transformer (12) is coupled to the output filtering subunit (13), and the other end of the output filtering subunit (13) is coupled to an LED lamp source.
3. The LED power supply circuit of claim 2, wherein: the rectifying and voltage stabilizing subunit (11) comprises a first alternating current input end, a second alternating current input end, a positive output end and a negative output end, wherein the first alternating current input end is coupled to a live wire, the second alternating current input end is coupled to a zero line, and the positive output end and the negative output end are coupled to a primary side of the transformer (12) to output direct current voltage.
4. The LED power supply circuit of claim 1, wherein: temperature detecting element (2) are including detecting subunit (21), comparison subunit (22) and switch subunit (23), detect subunit (21) and be used for detecting LED supply circuit's circuit temperature condition and output temperature detection signal, comparison subunit (22) are coupled in detecting subunit (21), comparison subunit (22) are provided with the temperature signal threshold, and when the temperature detection signal was greater than the temperature signal threshold, comparison subunit (22) output temperature comparison signal, the input of switch subunit (23) is coupled in comparison subunit (22), the output of switch subunit (23) is coupled in control unit (3), output enabling signal to control unit (3) when switch subunit (23) are used for receiving the temperature comparison signal triggers start-up control unit (3).
5. The LED power supply circuit of claim 4, wherein: the detection subunit (21) comprises a thermistor NTC and a first resistor R1, the thermistor NTC is connected with the first resistor R1 in series, the other end of the thermistor NTC is coupled with a power supply voltage, the other end of the first resistor R1 is grounded, and the connection node of the thermistor NTC and the first resistor R1 is coupled with the comparison subunit (22).
6. The LED power supply circuit of claim 5, wherein: the comparison subunit (22) comprises a comparator N1, a first input terminal of the comparator N1 is coupled to a connection node between the thermistor NTC and the first resistor R1, a second input terminal of the comparator N1 is coupled to a threshold voltage for inputting the temperature signal threshold, and an output terminal of the comparator N1 is coupled to the switch subunit (23).
7. The LED power supply circuit of claim 6, wherein: the switch subunit (23) includes a first triode Q1, a light emitting diode D, and a photoelectric switch Q, wherein a base of the first triode Q1 is coupled to an output end of the comparator N1, a collector of the first triode Q1 is coupled to a power supply voltage after being connected in series with the light emitting diode D, an emitter of the first triode Q1 is grounded, the photoelectric switch Q is coupled to the light emitting diode D, a collector of the photoelectric switch Q is coupled to the power supply voltage after being coupled to the control unit (3), and an emitter of the photoelectric switch Q is grounded.
8. The LED power supply circuit of claim 7, wherein: the control unit (3) comprises a chip U1, a second transistor Q2 and a relay KM1, wherein an input end of the chip U1 is coupled to a collector of the photoelectric switch tube Q, an output end of the chip U1 is coupled to a base of the second transistor Q2, a collector of the second transistor Q2 is coupled to a power supply voltage after being connected in series with a coil part of the relay KM1, an emitter of the second transistor Q2 is grounded, the relay KM1 comprises a normally closed contact switch KM1-1, and the normally closed contact switch KM1-1 is coupled to the power supply unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220886005.9U CN217087786U (en) | 2022-04-15 | 2022-04-15 | LED power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220886005.9U CN217087786U (en) | 2022-04-15 | 2022-04-15 | LED power supply circuit |
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| Publication Number | Publication Date |
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| CN217087786U true CN217087786U (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220886005.9U Active CN217087786U (en) | 2022-04-15 | 2022-04-15 | LED power supply circuit |
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| CN (1) | CN217087786U (en) |
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