CN213585564U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN213585564U CN213585564U CN202022129738.1U CN202022129738U CN213585564U CN 213585564 U CN213585564 U CN 213585564U CN 202022129738 U CN202022129738 U CN 202022129738U CN 213585564 U CN213585564 U CN 213585564U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a technical scheme for provide a switching power supply, including NTC thermistor RT1, bridge rectifier circuit BD1, filter circuit, for control chip U1 provides starting voltage's starting circuit and transformer T1, NTC thermistor RT1 connects between filter circuit and this switching power supply's power input end, starting circuit connects between filter circuit output and control chip U1's VCC voltage end, connects in parallel with relay drive circuit respectively at NTC thermistor RT 1's both ends and starting circuit's both ends the control chip U1 is in after normal work, relay drive circuit makes NTC thermistor RT 1's both ends and starting circuit's both ends short circuit respectively. The utility model discloses can reduce the switching power supply that start impulse current and stand-by power consumption are low.
Description
Technical Field
The present invention relates to a switching power supply, and more particularly to a switching power supply capable of reducing power-on inrush current and reducing standby power consumption.
Background
In the switching power supply in the prior art, a high-voltage-resistant large-capacity capacitor is mostly adopted for filtering and storing energy, and at the moment of starting the switching power supply, due to the characteristic that the voltage at two ends of the capacitor cannot change suddenly, the switching power supply is in a transient virtual short-circuit state, so that the starting current of the switching power supply is extremely large, and other electronic components in a circuit are extremely easy to burn by excessive current. When the switching power supply is started to work, the bias capacitor of the VCC voltage end of the relevant IC chip needs to be charged through the starting resistor so as to ensure that the VCC voltage of the IC chip is in a normal state, but after the IC chip is started, current loss still exists on the starting resistor, and unnecessary no-load loss is caused.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a switching power supply that can reduce start impulse current and stand-by power consumption is low.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model discloses a switching power supply, include NTC thermistor RT1, bridge rectifier circuit BD1, filter circuit, provide starting circuit and transformer T1 of starting voltage for control chip U1, NTC thermistor RT1 connects between filter circuit and this switching power supply's power input end, starting circuit connects between filter circuit output and control chip U1's VCC voltage end, its characterized in that: the two ends of the NTC thermistor RT1 and the two ends of the starting circuit are respectively connected with the relay driving circuit in parallel, and after the control chip U1 works normally, the relay driving circuit respectively enables the two ends of the NTC thermistor RT1 and the two ends of the starting circuit to be in short circuit.
The relay driving circuit is composed of a photoelectric coupler U2, a triode Q1, a diode D6, a diode D7, a first relay switch K1, a second relay switch K2 and a plurality of resistors, wherein,
the positive pole of a diode in a light-emitting source of the photocoupler U2 is connected to the secondary voltage output end of the transformer T1 through a resistor R19, the negative pole of the diode in the light-emitting source is grounded, and a resistor R20 is bridged between the positive pole and the negative pole of the diode in the light-emitting source;
the collector of a phototriode in a light receiving source of the photoelectric coupler U2 is connected with the collector of the triode Q1 and a VCC voltage end, the emitter of the phototriode in the light receiving source is connected with the cathode of a Zener diode ZD1 through a resistor R22, and the anode of the Zener diode is grounded;
the base electrode of the triode Q1 is connected with the negative electrode of the Zener diode ZD1, the emitter electrode of the triode Q1 is connected with one end of the relay coil of the first relay switch K1, which is connected with the relay coil of the second relay switch K2 in parallel, through the resistor R21, and the other end of the relay coil of the first relay switch K1, which is connected with the relay coil of the second relay switch K2 in parallel, is grounded;
the diode D6 is connected between the emitter and the base of the triode Q1 in a bridge connection manner;
a capacitor C13 and a diode D7 are connected across two ends of the relay, the capacitor C13 is connected with the diode D7 in parallel, and the anode of the diode D7 is grounded.
The starting circuit is formed by sequentially connecting a resistor R1, a resistor R2 and a resistor R3 in series, and a current inflow end of the resistor R1, a current outflow end of an inductor L2 in the filter circuit and a primary voltage input end of the transformer T1 are connected in common; one current outflow end of the resistor R3 is connected to the VCC voltage end of the control chip U1, and the other current outflow end is grounded through a capacitor C3.
The model of the triode Q1 is BC817, and the model of the photoelectric coupler U2 is LTV-1008.
Compared with the prior art, the switch power supply can reduce the start-up impact current by using the thermistor at the start-up moment; after the switching power supply is completely started, the relay enables the thermistor and the starting resistor to be in short circuit so as to reduce the energy consumption of the switching power supply and the standby power consumption.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in fig. 1, the switching power supply of the present invention is composed of a rectifier filter circuit, a standby voltage converting circuit, a start circuit, and a relay driving circuit.
1. Rectifying and filtering circuit
The rectification filter circuit consists of an EMI prevention filter circuit, an NTC thermistor RT1 and a bridge rectifier circuit BD 1.
The NTC thermistor RT1 is connected between the EMI prevention filter circuit and the mains supply power supply end, and the EMI prevention filter circuit is composed of a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2.
In an embodiment, at the moment when the switching power supply is powered on, the resistance of the NTC thermistor RT1 is large, so that the inrush current at the time of power on can be reduced.
2. Standby voltage conversion circuit
The standby voltage conversion circuit is connected with the output end of the bridge rectifier circuit BD1 through an EMI prevention filter circuit, and comprises a transformer T1, a control chip U1 connected with a transformer T1, a diode D1, a diode D5, a plurality of capacitors and a plurality of resistors. The Standby Voltage conversion circuit converts the HV Voltage signal output from the bridge rectifier circuit BD1 into a Standby Voltage (Standby Voltage).
3. Starting circuit
The starting circuit is formed by sequentially connecting a resistor R1, a resistor R2 and a resistor R3 in series, and a current inflow end of the resistor R1, a current outflow end of an inductor L2 in the filter circuit and a primary voltage input end of the transformer T1 are connected in common; one current outflow end of the resistor R3 is connected to the VCC voltage end of the control chip U1, and the other current outflow end is grounded through a capacitor C3.
4. Relay drive circuit
The relay driving circuit is composed of a photoelectric coupler U2, a triode Q1, a diode D6, a diode D7, a first relay switch K1, a second relay switch K2 and a plurality of resistors, wherein,
the positive pole of a diode in a light-emitting source of the photocoupler U2 is connected to the secondary voltage output end of the transformer T1 through a resistor R19, the negative pole of the diode in the light-emitting source is grounded, and a resistor R20 is bridged between the positive pole and the negative pole of the diode in the light-emitting source;
the collector of a phototriode in a light receiving source of the photoelectric coupler U2 is connected with the collector of the triode Q1 and a VCC voltage end, the emitter of the phototriode in the light receiving source is connected with the cathode of a Zener diode ZD1 through a resistor R22, and the anode of the Zener diode is grounded;
the photoelectric coupler U2 only enables single-phase transmission of electric signals, has good isolation effect on input and output electric signals, and has good electric insulation capacity and anti-interference capacity.
The model of the optoelectronic coupler U2 is LTV-1008 (CTR: 130-260).
The base electrode of the triode Q1 is connected with the negative electrode of the Zener diode ZD1, the emitter electrode of the triode Q1 is connected with one end of the relay coil of the first relay switch K1, which is connected with the relay coil of the second relay switch K2 in parallel, through the resistor R21, and the other end of the relay coil of the first relay switch K1, which is connected with the relay coil of the second relay switch K2 in parallel, is grounded;
the diode D6 is connected between the emitter and the base of the triode Q1 in a bridge connection manner;
a capacitor C13 and a diode D7 are connected across two ends of the relay, the capacitor C13 is connected with the diode D7 in parallel, and the anode of the diode D7 is grounded.
The transistor Q1 has a model BC817(Vcbo is 50V, Vce is 45V).
5. Working process
At the moment when the switching power supply of the utility model is turned on, the resistance of the NTC thermistor RT1 is very large, so that the starting impact current input to the bridge rectifier circuit BD1 can be reduced; when the switching power supply works, the bridge rectifier circuit BD1 rectifies a voltage signal output by the EMI prevention filter circuit and outputs the rectified voltage signal to the standby voltage conversion circuit, and at the moment, the control chip U1 enters a normal working state after the start circuit is started. A standby voltage (standby voltage) is output through the standby switching circuit, the standby voltage is reduced by the resistor R19 and then output to the photoelectric coupler U2, the output end of the photoelectric coupler U2 is turned on, and therefore a high-level voltage signal is output to turn on the triode Q1.
After the triode Q1 is conducted, the first relay switch K1 and the second relay switch K2 in the relay driving electric appliance have current flowing through, the first relay switch K1 is closed, and the NTC thermistor RT1 is in short circuit; the second relay switch K2 closes, shorting the starting circuit.
The utility model discloses a switching power supply, the electric resistance in the twinkling of an eye is very big on the start, and impulse current when can reducing the start prevents to burn out switching power supply's electron device. When the switching power supply is completely started and the control chip U1 enters normal operation, two ends of a starting circuit for starting the control chip U1 are short-circuited, so that unnecessary standby energy consumption is reduced.
Claims (4)
1. A switching power supply comprises an NTC thermistor RT1, a bridge rectifier circuit BD1, a filter circuit, a starting circuit for providing starting voltage for a control chip U1 and a transformer T1, wherein the NTC thermistor RT1 is connected between the filter circuit and the power supply input end of the switching power supply, the starting circuit is connected between the output end of the filter circuit and the VCC voltage end of the control chip U1, and the switching power supply is characterized in that: the two ends of the NTC thermistor RT1 and the two ends of the starting circuit are respectively connected with the relay driving circuit in parallel, and after the control chip U1 works normally, the relay driving circuit respectively enables the two ends of the NTC thermistor RT1 and the two ends of the starting circuit to be in short circuit.
2. The switching power supply according to claim 1, characterized in that: the relay driving circuit is composed of a photoelectric coupler U2, a triode Q1, a diode D6, a diode D7, a first relay switch K1, a second relay switch K2 and a plurality of resistors, wherein,
the positive pole of a diode in a light-emitting source of the photocoupler U2 is connected to the secondary voltage output end of the transformer T1 through a resistor R19, the negative pole of the diode in the light-emitting source is grounded, and a resistor R20 is bridged between the positive pole and the negative pole of the diode in the light-emitting source;
the collector of a phototriode in a light receiving source of the photoelectric coupler U2 is connected with the collector of the triode Q1 and a VCC voltage end, the emitter of the phototriode in the light receiving source is connected with the cathode of a Zener diode ZD1 through a resistor R22, and the anode of the Zener diode is grounded;
the base electrode of the triode Q1 is connected with the negative electrode of the Zener diode ZD1, the emitter electrode of the triode Q1 is connected with one end of the relay coil of the first relay switch K1, which is connected with the relay coil of the second relay switch K2 in parallel, through the resistor R21, and the other end of the relay coil of the first relay switch K1, which is connected with the relay coil of the second relay switch K2 in parallel, is grounded;
the diode D6 is connected between the emitter and the base of the triode Q1 in a bridge connection manner;
a capacitor C13 and a diode D7 are connected across two ends of the relay, the capacitor C13 is connected with the diode D7 in parallel, and the anode of the diode D7 is grounded.
3. The switching power supply according to claim 2, characterized in that: the starting circuit is formed by sequentially connecting a resistor R1, a resistor R2 and a resistor R3 in series, and a current inflow end of the resistor R1, a current outflow end of an inductor L2 in the filter circuit and a primary voltage input end of the transformer T1 are connected in common; one current outflow end of the resistor R3 is connected to the VCC voltage end of the control chip U1, and the other current outflow end is grounded through a capacitor C3.
4. The switching power supply according to claim 3, characterized in that: the model of the triode Q1 is BC817, and the model of the photoelectric coupler U2 is LTV-1008.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022129738.1U CN213585564U (en) | 2020-09-24 | 2020-09-24 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022129738.1U CN213585564U (en) | 2020-09-24 | 2020-09-24 | Switching power supply |
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| CN213585564U true CN213585564U (en) | 2021-06-29 |
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| CN202022129738.1U Active CN213585564U (en) | 2020-09-24 | 2020-09-24 | Switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
| CN116093908A (en) * | 2023-03-22 | 2023-05-09 | 广东东菱电源科技有限公司 | Low surge circuit with low dimming turn-off loss |
| CN117177411A (en) * | 2023-11-03 | 2023-12-05 | 广东东菱电源科技有限公司 | Low-temperature starting and quick shutdown circuit |
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2020
- 2020-09-24 CN CN202022129738.1U patent/CN213585564U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
| CN113922655B (en) * | 2021-10-18 | 2024-02-20 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starting and power-off alarm circuit and switching power supply |
| CN116093908A (en) * | 2023-03-22 | 2023-05-09 | 广东东菱电源科技有限公司 | Low surge circuit with low dimming turn-off loss |
| CN116093908B (en) * | 2023-03-22 | 2023-06-23 | 广东东菱电源科技有限公司 | Low surge circuit with low dimming turn-off loss |
| CN117177411A (en) * | 2023-11-03 | 2023-12-05 | 广东东菱电源科技有限公司 | Low-temperature starting and quick shutdown circuit |
| CN117177411B (en) * | 2023-11-03 | 2024-02-06 | 广东东菱电源科技有限公司 | Low-temperature starting and quick shutdown circuit |
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