CN211606381U - Protection circuit for reducing startup surge of switching power supply - Google Patents
Protection circuit for reducing startup surge of switching power supply Download PDFInfo
- Publication number
- CN211606381U CN211606381U CN201922329424.3U CN201922329424U CN211606381U CN 211606381 U CN211606381 U CN 211606381U CN 201922329424 U CN201922329424 U CN 201922329424U CN 211606381 U CN211606381 U CN 211606381U
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- power supply
- circuit
- phase detection
- controlled switch
- silicon controlled
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- 238000001514 detection method Methods 0.000 claims abstract description 50
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 24
- 239000010703 silicon Substances 0.000 claims abstract description 24
- 230000005611 electricity Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 12
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 claims description 7
- 101150105073 SCR1 gene Proteins 0.000 claims description 7
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 7
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a reduce protection circuit of switching power supply start surge, it includes power supply circuit, phase place detection circuitry and silicon controlled switch circuit, power LN both ends constitute the return circuit with the LED driver, it has silicon controlled switch circuit to establish ties in the return circuit, power supply circuit gets the operating voltage of electricity and output phase place detection circuitry from power LN both ends, phase place detection circuitry carries out the phase place detection of alternating current to power L end, and according to the opening/breaking of testing result output control silicon controlled switch circuit with control circuit. The utility model discloses a zero phase detection and silicon controlled switch detect and control lighting circuit, effectively restrain the surge current problem that the product produced in the twinkling of an eye at the start, furthest's emergence has been restrained in the twinkling of an eye at the start.
Description
Technical Field
The utility model relates to the field of lighting technology, especially a reduce protection circuit of switching power supply start surge.
Background
With the increase of lighting devices, surge current generated by a product at the starting moment is several times or even hundreds times of normal use current of the product, so that the generated interference is large, and meanwhile, the operation of other electrical equipment is also influenced, especially equipment with high safety performance, such as elevator equipment and the like. The larger the power is, the larger the influence of the startup surge current on the equipment is, and the reliable operation of the equipment is not facilitated. Severe can also cause the electrical switch to trip.
At present, in the prior art, a thermistor is always used at an input end, and the physical characteristic of the thermistor is utilized, so that only the surge current value can be reduced, the problem cannot be completely solved, and the efficiency and the power of the loss product are higher, and the loss is higher.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, provide a protection circuit that reduces switching power supply start surge, effectively restrain the surge current problem that the product produced in the twinkling of an eye at the start, furthest's emergence has been restrained in the twinkling of an eye at the start.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a protection circuit for reducing startup surge of a switching power supply comprises a power supply circuit, a phase detection circuit and a silicon controlled switch circuit, wherein two ends of a power supply LN and an LED driver form a loop, the silicon controlled switch circuit is connected in series in the loop, the power supply circuit obtains electricity from two ends of the power supply LN and outputs working voltage of the phase detection circuit, the phase detection circuit carries out alternating current phase detection on an L end of the power supply, and the phase detection circuit outputs and controls the on/off of the silicon controlled switch circuit according to a detection result so as to control the on/off of the loop.
In the technical scheme, the power supply circuit comprises a resistor R1, a diode D1, a polar capacitor C1 and a voltage regulator tube ZD1, wherein the resistor R1, the diode D1 and the polar capacitor C1 are connected in series and then connected in parallel between two ends of a power supply LN, and the voltage regulator tube ZD1 is connected in parallel with the polar capacitor C1; the node between the diode D1 and the polarity capacitor C1 is output as the operating voltage of the phase detection circuit.
In the above technical solution, a resistor R2 is also connected in series between the resistor R1 and the diode D1.
In the above technical solution, the phase detection circuit includes a phase detection chip U1, a detection end of the phase detection chip U1 is connected with the power supply L end after being connected with a resistor R3 in series, and an output end of the phase detection chip U1 is connected with a control end of the thyristor switch circuit.
In the above technical solution, the detection end of the phase detection chip U1 is connected in series with the resistor R3 and the resistor R4 and then connected to the power supply L.
In the technical scheme, the silicon controlled switch circuit comprises a silicon controlled switch SCR1, the control end of the silicon controlled switch SCR1 is connected with the output end of the phase detection circuit, and the input end and the output end are respectively connected with the LED driver and the N end of the power supply.
In the above technical scheme, the LED driver is electrically connected with an LED lamp.
The utility model has the advantages that: the lighting loop is detected and controlled through zero phase detection and the silicon controlled switch, the problem of surge current generated at the moment of starting the product is effectively restrained, and the surge current is restrained to the maximum extent at the moment of starting the product.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the protection circuit for reducing the power-on surge of the switching power supply includes a power supply circuit, a phase detection circuit and a thyristor switch circuit, wherein two ends of a power supply LN and an LED driver form a loop, the thyristor switch circuit is connected in series in the loop, the power supply circuit takes power from two ends of the power supply LN and outputs the working voltage of the phase detection circuit, the phase detection circuit performs phase detection of alternating current at an L end of the power supply, and controls the on/off of the thyristor switch circuit according to the detection result to control the on/off of the loop. The silicon controlled switch circuit with the voltage not being zero phase does not start, so that the generation of overshoot during starting can be prevented.
Specifically, the power supply circuit comprises a resistor R1, a diode D1, a polar capacitor C1 and a voltage regulator tube ZD1, wherein the resistor R1, the diode D1 and the polar capacitor C1 are connected in series and then connected in parallel between two ends of a power supply LN, and the voltage regulator tube ZD1 is connected in parallel with the polar capacitor C1; the node between the diode D1 and the polarity capacitor C1 is output as the operating voltage of the phase detection circuit. A resistor R2 is also connected in series between the resistor R1 and the diode D1.
Specifically, the phase detection circuit comprises a phase detection chip U1, a detection end of the phase detection chip U1 is connected with the power supply L end after being connected with a resistor R3 and a resistor R4 in series, and an output end of the phase detection chip U1 is connected with a control end of the silicon controlled switch circuit.
Specifically, the silicon controlled switch circuit comprises a silicon controlled switch SCR1, a control end of the silicon controlled switch SCR1 is connected with an output end of the phase detection circuit, and an input end and an output end of the silicon controlled switch SCR1 are respectively connected with the LED driver and the N end of the power supply.
Specifically, the LED driver is electrically connected with two LED lamps connected in series.
The utility model discloses a theory of operation: by using the zero point detection technology, the circuit can always start to work at a zero phase, the current slowly climbs, and the phenomenon that the surge current is overlarge because the circuit is started at a positive angle or a negative angle of 90 degrees is prevented.
The above embodiments are merely illustrative and not restrictive, and all equivalent changes and modifications made by the methods described in the claims are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides a reduce switching power supply start surge's protection circuit which characterized in that: the LED phase detection circuit comprises a power supply circuit, a phase detection circuit and a silicon controlled switch circuit, wherein two ends of a power supply LN and an LED driver form a loop, the silicon controlled switch circuit is connected in series in the loop, the power supply circuit obtains electricity from two ends of the power supply LN and outputs working voltage of the phase detection circuit, the phase detection circuit carries out phase detection on alternating current at an L end of the power supply, and the phase detection circuit controls the on/off of the silicon controlled switch circuit according to the output of a detection result so as to control the on/off of the loop.
2. The protection circuit for reducing the power-on surge of the switching power supply according to claim 1, wherein: the power supply circuit comprises a resistor R1, a diode D1, a polar capacitor C1 and a voltage-regulator tube ZD1, wherein the resistor R1, the diode D1 and the polar capacitor C1 are connected in series and then connected in parallel between two ends of a power supply LN, and the voltage-regulator tube ZD1 is connected in parallel with the polar capacitor C1; the node between the diode D1 and the polarity capacitor C1 is output as the operating voltage of the phase detection circuit.
3. The protection circuit for reducing the power-on surge of the switching power supply according to claim 2, wherein: a resistor R2 is also connected in series between the resistor R1 and the diode D1.
4. The protection circuit for reducing the power-on surge of the switching power supply according to claim 1, wherein: the phase detection circuit comprises a phase detection chip U1, a detection end of the phase detection chip U1 is connected with the L end of the power supply after being connected with a resistor R3 in series, and an output end of the phase detection chip U1 is connected with a control end of the silicon controlled switch circuit.
5. The protection circuit for reducing the power-on surge of the switching power supply according to claim 4, wherein: the detection end of the phase detection chip U1 is connected with the power L end after being connected with the resistor R3 and the resistor R4 in series.
6. The protection circuit for reducing the power-on surge of the switching power supply according to claim 1, wherein: the silicon controlled switch circuit comprises a silicon controlled switch SCR1, the control end of the silicon controlled switch SCR1 is connected with the output end of the phase detection circuit, and the input end and the output end are respectively connected with the LED driver and the N end of the power supply.
7. The protection circuit for reducing the power-on surge of the switching power supply according to claim 1, wherein: the LED driver is electrically connected with an LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922329424.3U CN211606381U (en) | 2019-12-23 | 2019-12-23 | Protection circuit for reducing startup surge of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922329424.3U CN211606381U (en) | 2019-12-23 | 2019-12-23 | Protection circuit for reducing startup surge of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211606381U true CN211606381U (en) | 2020-09-29 |
Family
ID=72594567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922329424.3U Active CN211606381U (en) | 2019-12-23 | 2019-12-23 | Protection circuit for reducing startup surge of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211606381U (en) |
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2019
- 2019-12-23 CN CN201922329424.3U patent/CN211606381U/en active Active
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| GR01 | Patent grant | ||
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| CP02 | Change in the address of a patent holder |
Address after: Building 1, No. 253 Henglijun Road, Hengli Town, Dongguan City, Guangdong Province, 523460 Patentee after: DONGGUAN GUANQING INTELLIGENT LIGHTING TECHNOLOGY Co.,Ltd. Address before: 523000 No.1 Hengquan Industrial Zone, Hengli Town, Dongguan City, Guangdong Province Patentee before: DONGGUAN GUANQING INTELLIGENT LIGHTING TECHNOLOGY Co.,Ltd. |