CN210724558U - Circuit for inhibiting surge current of switching power supply - Google Patents
Circuit for inhibiting surge current of switching power supply Download PDFInfo
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- CN210724558U CN210724558U CN201922220122.2U CN201922220122U CN210724558U CN 210724558 U CN210724558 U CN 210724558U CN 201922220122 U CN201922220122 U CN 201922220122U CN 210724558 U CN210724558 U CN 210724558U
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Abstract
The utility model discloses a restrain switching power supply surge current's circuit, including resistance R700, R701, R710, R702, R704, R705, controllable accurate steady voltage source SHR700, triode Q700, relay REL700, resistance R700's one end and input are connected, the other end is connected with resistance R710's one end, resistance R710's the other end is connected with resistance R701's one end, resistance R701's the other end is connected with resistance R702's one end, controllable accurate steady voltage source SHR 700's 1 pin is connected with resistance R701, controllable accurate steady voltage source SHR 700's 2 pins are connected with resistance R704's one end, resistance R704's the other end is connected with triode Q700's base, triode Q700's collecting electrode is connected with relay REL 700's input, resistance R705's one end is connected with the common junction point between resistance R704 and triode Q700's the base; in the circuit, the resistors R700, R701 and R710 preset detection voltages, and after the detection voltages reach the preset voltages, the voltage of the pin 2 of the controllable precision voltage regulator SHR700 becomes low, so that the triode Q700 is conducted to supply power to the control end of the relay REL 700.
Description
Technical Field
The utility model relates to an electronic circuit technical field specifically is a restrain switching power supply surge current's circuit.
Background
The switching power supply has the advantages of small volume, high efficiency and the like, and is widely applied to the fields of computers, industrial control, communication and consumer electronics. In the prior art, a high-voltage electrolytic capacitor is usually provided at the input terminal of the switching power supply, and is used for smoothing the input voltage and storing energy. At the moment of starting the switch power supply, because the voltage of the capacitor cannot suddenly change, the equivalent resistance at two ends of the electrolytic capacitor is approximately 0 omega, and the current flowing through the main loop is dozens of amperes. In particular, the inrush current is larger when the capacitance is increased. Such a large surge current at the moment of power supply connection can cause the input fuse to be blown or the switch to be electrically shocked and burned out, or the rectifier bridge is damaged by overcurrent, so that the switching power supply cannot normally work.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a restrain switching power supply surge current's circuit.
A circuit for suppressing surge current of a switching power supply comprises resistors R700, R701, R710, R702, R704, R705, a controllable precision voltage-stabilizing source SHR700, a triode Q700 and a relay REL700, wherein one end of the resistor R700 is connected with an input end, the other end of the resistor R710 is connected with one end of the resistor R701, the other end of the resistor R701 is connected with one end of the resistor R702, a pin 1 of the controllable precision voltage-stabilizing source SHR700 is connected with a common connection point between the resistor R701 and the resistor R702, a pin 2 of the controllable precision voltage-stabilizing source SHR700 is connected with one end of the resistor R704, the other end of the resistor R704 is connected with a base electrode of the triode Q700, an emitting electrode of the triode Q700 is connected with VCC, a collecting electrode of the triode Q700 is connected with an input end of the relay REL700, and one end of the resistor R705 is connected with a common connection point between the resistor R704 and the base electrode of the.
In one embodiment, the circuit for suppressing the surge current of the switching power supply further includes a resistor R703 and a diode D700, an anode of the diode D700 is connected to a collector of the transistor Q700, and a cathode of the diode D700 is connected to one end of the resistor R703.
In one embodiment, the circuit for suppressing the surge current of the switching power supply further includes a diode D701 and a diode D702, and the diode D701 and the diode D702 are connected in parallel with the relay REL 700.
In one embodiment, the circuit for suppressing the surge current of the switching power supply further includes a resistor R706, one end of the resistor R706 is connected to the collector of the transistor Q700, and the other end is connected to the relay REL 700.
In one embodiment, the circuit for suppressing the surge current of the switching power supply further includes a capacitor C700, and the capacitor C700 is connected in parallel with the resistor R702.
In the circuit for inhibiting the surge current of the switching power supply, the resistors R700, R701, R710 and R702 and the controllable precise voltage regulator SHR700 form a logic detection circuit; the resistors R700, R701 and R710 preset detection voltage, and after the detection voltage reaches the preset voltage, the 2-pin voltage of the controllable precision voltage-stabilizing source SHR700 becomes low, so that the base voltage of the triode Q700 is pulled down, the triode Q700 is conducted, the output voltage of the collector of the triode Q700 is approximately equal to VCC, the output of the voltage is kept constant, and the normal work of the circuit is maintained.
Drawings
Fig. 1 is a circuit diagram of a circuit for suppressing surge current of a switching power supply according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a circuit for suppressing surge current of a switching power supply includes resistors R700, R701, R710, R702, R704, R705, a controllable precision voltage regulator SHR700, a transistor Q700, and a relay REL700, wherein one end of the resistor R700 is connected to an input terminal, the other end is connected to one end of the resistor R710, the other end of the resistor R710 is connected to one end of the resistor R701, the other end of the resistor R701 is connected to one end of the resistor R702, pin 1 of the controllable precision voltage regulator SHR700 is connected to a common connection point between the resistor R701 and the resistor R702, pin 2 of the controllable precision voltage regulator SHR700 is connected to one end of the resistor R704, the other end of the resistor R704 is connected to a base of the transistor Q700, an emitter of the transistor Q700 is connected to VCC, a collector of the transistor Q700 is connected to an input terminal of the relay REL700, and one end of the resistor R705 is connected to a common connection point between the resistor R704 and the.
Voltage is input from one end of the resistor R700, after the resistance values of the resistor R710 and the resistor R701 are set through the resistor R710 and the resistor R701, a fixed preset voltage is generated, when the input voltage reaches a preset voltage value, the voltage of the 2 pins of the controllable precision voltage stabilization source SHR700 becomes low, so that the triode Q700 is conducted, the voltage output to the relay REL700 is equal to VCC, and the voltage output to the relay REL700 is always kept at a constant value.
In the circuit for inhibiting the surge current of the switching power supply, the resistors R700, R701, R710 and R702 and the controllable precise voltage-stabilizing source SHR700 form a logic detection circuit; the resistors R700, R701 and R710 preset detection voltage, and after the detection voltage reaches the preset voltage, the 2-pin voltage of the controllable precision voltage-stabilizing source SHR700 becomes low, so that the base voltage of the triode Q700 is pulled down, the triode Q700 is conducted, the output voltage of the collector of the triode Q700 is approximately equal to VCC, the output of the voltage is kept constant, and the normal work of the circuit is maintained.
Furthermore, the circuit for suppressing the surge current of the switching power supply further comprises a resistor R703 and a diode D700, wherein the anode of the diode D700 is connected with the collector of the triode Q700, and the cathode of the diode D700 is connected with one end of the resistor R703.
In this way, the resistor R703 and the diode D700 establish a steady state bias to prevent the relay REL700 from switching after the collector voltage of the transistor Q700 drops to 1 preset voltage.
Further, the circuit for suppressing the surge current of the switching power supply further comprises a diode D701 and a diode D702, and the diode D701 and the diode D702 are connected in parallel with the relay REL 700.
Thus, the diode D701 and the diode D702 are connected in parallel with the bias coil of the relay REL700, and absorb the induced electromotive force spike during the switching process of the relay REL 700.
Further, the circuit for suppressing the surge current of the switching power supply further includes a resistor R706, one end of the resistor R706 is connected to the collector of the transistor Q700, and the other end is connected to the relay REL 700.
In this way, resistor R706 is used to limit the bias coil voltage of relay REL700, effectively protecting relay REL700 from damage.
Further, the circuit for suppressing the surge current of the switching power supply further comprises a capacitor C700, and the capacitor C700 is connected in parallel with the resistor R702.
Thus, the capacitor C700 has a good filtering effect, and high-frequency clutter in the circuit is filtered out to avoid interference.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (5)
1. A circuit for suppressing surge current of a switching power supply, comprising: the controllable precision voltage-stabilizing power supply system comprises resistors R700, R701, R710, R702, R704, R705, a controllable precision voltage-stabilizing source SHR700, a triode Q700 and a relay REL700, wherein one end of the resistor R700 is connected with an input end, the other end of the resistor R710 is connected with one end of the resistor R701, the other end of the resistor R701 is connected with one end of the resistor R702, a pin 1 of the controllable precision voltage-stabilizing source SHR700 is connected with a common connection point between the resistor R701 and the resistor R702, a pin 2 of the controllable precision voltage-stabilizing source SHR700 is connected with one end of the resistor R704, the other end of the resistor R704 is connected with a base electrode of the triode Q700, an emitting electrode of the triode Q700 is connected with VCC, a collecting electrode of the triode Q700 is connected with the input end of the relay REL700, and one end of the resistor R705 is connected with the common connection point between the resistor.
2. A circuit for suppressing surge current of a switching power supply according to claim 1, wherein: the circuit for suppressing surge current of the switching power supply further comprises a resistor R703 and a diode D700, wherein the anode of the diode D700 is connected with the collector of the triode Q700, and the cathode of the diode D700 is connected with one end of the resistor R703.
3. A circuit for suppressing surge current of a switching power supply according to claim 1, wherein: the circuit for suppressing the surge current of the switching power supply further comprises a diode D701 and a diode D702, wherein the diode D701 and the diode D702 are connected with the control end of the relay REL700 in parallel.
4. A circuit for suppressing surge current of a switching power supply according to claim 1, wherein: the circuit for suppressing surge current of the switching power supply further comprises a resistor R706, wherein one end of the resistor R706 is connected with the collector of the triode Q700, and the other end of the resistor R706 is connected with the relay REL 700.
5. A circuit for suppressing surge current of a switching power supply according to claim 1, wherein: the circuit for suppressing the surge current of the switching power supply further comprises a capacitor C700, wherein the capacitor C700 is connected with the resistor R702 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220122.2U CN210724558U (en) | 2019-12-12 | 2019-12-12 | Circuit for inhibiting surge current of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220122.2U CN210724558U (en) | 2019-12-12 | 2019-12-12 | Circuit for inhibiting surge current of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210724558U true CN210724558U (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922220122.2U Active CN210724558U (en) | 2019-12-12 | 2019-12-12 | Circuit for inhibiting surge current of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210724558U (en) |
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2019
- 2019-12-12 CN CN201922220122.2U patent/CN210724558U/en active Active
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Address after: Room 401, 4th Floor, No. 3 Shima Ping An Street, Junhe Street, Baiyun District, Guangzhou City, Guangdong Province, 510000 Patentee after: GUANGZHOU NENGZHIWEI ELECTRONICS CO.,LTD. Address before: 510000, 2nd Floor, Building B, Dalang Taiyangshen Industrial Zone, Xiahuayi Road, Baiyunhu Street, Baiyun District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU NENGZHIWEI ELECTRONICS CO.,LTD. |