CN211018641U - Switching power supply slow starting circuit capable of quickly restraining impact current - Google Patents
Switching power supply slow starting circuit capable of quickly restraining impact current Download PDFInfo
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- CN211018641U CN211018641U CN201922301190.1U CN201922301190U CN211018641U CN 211018641 U CN211018641 U CN 211018641U CN 201922301190 U CN201922301190 U CN 201922301190U CN 211018641 U CN211018641 U CN 211018641U
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Abstract
The utility model discloses a switch power supply slow starting circuit for fast inhibiting impulse current, wherein the anode of the direct current input end is connected with the anode of the first inverse logic optocoupler input end through a first resistor and a first voltage-regulator tube, and is connected with the anode of the direct current output end through a first diode; the positive electrode of the output end of the first reverse logic optocoupler is connected with the grid electrode of a first MOS tube, the drain electrode of the first MOS tube is connected with the negative electrode of the output and input end of the first reverse logic optocoupler and the negative electrode of the direct current input end, the source electrode of the first MOS tube is connected with the negative electrode of the direct current output end, the source electrode of the first MOS tube is connected with the positive electrode of the input end of the first positive logic optocoupler through a fifth resistor and a sixth resistor which are connected in series, the negative electrode of the input end of the first positive logic optocoupler is connected with the positive electrode of the input end of the second positive logic optocoupler, the positive electrode and the negative electrode of the output end of the first positive logic optocoupler are; and the positive electrode and the negative electrode of the direct current output end are connected with a second capacitor indirectly. The utility model discloses the range of application is wide, is applicable to high-power switching power supply.
Description
Technical Field
The utility model belongs to the technical field of the power slow start technique and specifically relates to a switch power supply slow start circuit who restraines rush current fast is related to.
Background
At present, because a rectification filtering mode is mostly adopted in a switching power supply, particularly in a high-power switching power supply, in the process of starting the power supply with a load, because the initial voltage of a capacitor in a rectification filtering circuit is instantly increased from 0V to a rectified voltage value, a large impact current can be generated at the moment, and the impact current can easily cause disconnection of a front-end fuse or damage of a device, so that the power supply cannot work, a system is broken down and cannot be used. Although the slow start mode in the prior art can play a role in limiting current to a certain extent, after the power supply is instantly disconnected and restarted, the slow start mode cannot play a role in quickly suppressing impulse current, so that the risk of damaging certain devices exists.
Disclosure of Invention
In order to solve the above problem, the utility model aims at providing a switching power supply slow start circuit who restraines inrush current fast, it can realize accurate control impulse current limit value and impulse current duration, does not influence impulse current limit value and impulse current duration moreover at frequent switching on and shutting down in-process.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a switch power supply slow starting circuit for quickly inhibiting impact current comprises a direct current input end, a first reverse logic optical coupler V1, a first MOS tube M1, a first positive logic optical coupler OP1 and a second positive logic optical coupler OP2, wherein the positive pole of the direct current input end is connected with the positive pole of the input end of the first reverse logic optical coupler V1 through a first resistor R1 and a first voltage-stabilizing tube ZD1 which are connected in series, and is connected with the positive pole of the direct current output end through a first diode D1, and a second voltage-stabilizing tube ZD2 and a first capacitor C1 which are connected in parallel are connected between the positive pole and the negative pole of the output end of the first reverse logic optical coupler V1; the positive electrode of the output end of the first inverse logic optocoupler V1 is connected with the grid electrode of a first MOS tube M1, a third resistor R3 is connected between the grid electrode and the drain electrode of a first MOS tube M1, a fourth resistor R4 is connected between the drain electrode and the source electrode, the drain electrode of a first MOS tube M1 is connected with the negative electrode of the output end and the negative electrode of the input end of the first inverse logic optocoupler V1 and is connected with the negative electrode of the direct current input end, and the source electrode is connected with the negative electrode of the direct current output end; the source electrode of the first MOS transistor M1 is connected with the positive electrode of the input end of a first positive logic optical coupler OP1 through a fifth resistor R5 and a sixth resistor R6 which are connected in series, the negative electrode of the input end of the first positive logic optical coupler OP1 is connected with the positive electrode of the input end of a second positive logic optical coupler OP2, the positive electrode and the negative electrode of the output end of the first positive logic optical coupler OP1 are respectively connected with the grid electrode and the drain electrode of the first MOS transistor M1, the negative electrode of the input end of the second positive logic optical coupler OP2 is connected with the drain electrode of a first MOS transistor M1, and the input end of the second positive logic optical coupler OP2 is connected with a control signal input end; and a second capacitor C2 is connected between the positive pole and the negative pole of the direct current output end.
Further, the first MOS transistor M1 is an N-channel jfet.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the switch power supply slow starting circuit capable of quickly suppressing the impact current is simple in circuit design, low in manufacturing cost, few in components, convenient and reliable, strong in practicability and wide in application range, is suitable for a high-power switch power supply, enables the switch power supply to effectively suppress the input impact current, can still normally function under the condition of repeated startup and shutdown, effectively protects the power utilization load at the rear end, improves the reliability of the power supply and protects the safety of an input power grid.
Drawings
Fig. 1 is a schematic diagram of the switching power supply slow start circuit for quickly suppressing inrush current according to the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown IN fig. 1, the switching power supply slow start circuit for quickly suppressing inrush current includes a dc input terminal, a first inverted logic optocoupler V1, a first MOS transistor M1, a first positive logic optocoupler OP1, and a second positive logic optocoupler OP2, where a positive electrode (+ IN) of the dc input terminal is connected to a positive electrode of an input terminal of the first inverted logic optocoupler V1 through a first resistor R1 and a first voltage regulator ZD1 connected IN series, and is connected to a positive electrode (+ OUT) of a dc output terminal through a first diode D1 having an anti-reverse connection function, and a second voltage regulator 2 and a first capacitor C1 connected IN parallel are connected between the positive electrode and a negative electrode of an output terminal of the first inverted logic optocoupler V1; the positive electrode of the output end of the first inverse logic optocoupler V1 is connected with the grid electrode of a first MOS tube M1, a third resistor R3 is connected between the grid electrode and the drain electrode of a first MOS tube M1, a fourth resistor R4 is connected between the drain electrode and the source electrode, the drain electrode of a first MOS tube M1 is connected with the negative electrode of the output end and the negative electrode of the input end of the first inverse logic optocoupler V1 and is connected with the negative electrode (-IN) of the direct current input end, and the source electrode is connected with the negative electrode (-OUT) of the direct current output end; the source electrode of the first MOS transistor M1 is connected with the positive electrode of the input end of a first positive logic optical coupler OP1 through a fifth resistor R5 and a sixth resistor R6 which are connected in series, the negative electrode of the input end of the first positive logic optical coupler OP1 is connected with the positive electrode of the input end of a second positive logic optical coupler OP2, the positive electrode and the negative electrode of the output end of the first positive logic optical coupler OP1 are respectively connected with the grid electrode and the drain electrode of the first MOS transistor M1, the negative electrode of the input end of the second positive logic optical coupler OP2 is connected with the drain electrode of a first MOS transistor M1, and the input end of the second positive logic optical coupler OP2 is connected with a control signal input end (CS; and a second capacitor C2 is connected between the positive pole (+ OUT) and the negative pole (-OUT) of the direct current output terminal.
The first MOS transistor M1 is an N-channel jfet.
The model of the first reverse logic optical coupler V1 is M212, the models of the first positive logic optical coupler OP1 and the second positive logic optical coupler OP2 are M211, and the model of the first MOS transistor M1 is FDA50N 50; above each components and parts model can be according to the utility model discloses the particular case difference in the circuit is changed.
The utility model discloses restrain inrush current's switching power supply fast and slowly start circuit, its theory of operation is: when direct current voltage is connected between the positive electrode and the negative electrode of the direct current input end, the voltage is +270VDC or direct current voltage changed after alternating current input rectification, the grid electrode and the drain electrode of the first MOS tube are not conducted at the moment of starting, meanwhile, the second capacitor C2 is charged through the fourth resistor R4, the voltage at the two ends of the fourth resistor R4 is gradually reduced to enable the input end of the first positive logic optocoupler OP1 and the input end of the second positive logic optocoupler OP2 to be out of work, the first MOS tube M1 is conducted, the charging process of the second capacitor C2 is completed at the moment, and therefore the effect of slow starting is achieved.
After the power supply is turned off, the capacity of the front-end circuit is released due to the energy storage effect of the second capacitor C2, and after the front-end circuit is turned on again, the conduction speed of the first MOS transistor M1 is controlled through the first inverse logic optical coupler V1, so that the purpose of repeated turning on and off is achieved, and the slow start circuit still functions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A switch power supply slow starting circuit capable of quickly restraining impact current is characterized in that: the direct current circuit comprises a direct current input end, a first inverse logic optocoupler V1, a first MOS tube M1, a first positive logic optocoupler OP1 and a second positive logic optocoupler OP2, wherein the positive electrode of the direct current input end is connected with the positive electrode of the input end of the first inverse logic optocoupler V1 through a first resistor R1 and a first voltage-regulator tube ZD1 which are connected in series, and is connected with the positive electrode of the direct current output end through a first diode D1, and a second voltage-regulator tube ZD2 and a first capacitor C1 which are connected in parallel are connected between the positive electrode and the negative electrode of the output end of the first inverse logic optocoupler V1; the positive electrode of the output end of the first inverse logic optocoupler V1 is connected with the grid electrode of a first MOS tube M1, a third resistor R3 is connected between the grid electrode and the drain electrode of a first MOS tube M1, a fourth resistor R4 is connected between the drain electrode and the source electrode, the drain electrode of a first MOS tube M1 is connected with the negative electrode of the output end and the negative electrode of the input end of the first inverse logic optocoupler V1 and is connected with the negative electrode of the direct current input end, and the source electrode is connected with the negative electrode of the direct current output end; the source electrode of the first MOS transistor M1 is connected with the positive electrode of the input end of a first positive logic optical coupler OP1 through a fifth resistor R5 and a sixth resistor R6 which are connected in series, the negative electrode of the input end of the first positive logic optical coupler OP1 is connected with the positive electrode of the input end of a second positive logic optical coupler OP2, the positive electrode and the negative electrode of the output end of the first positive logic optical coupler OP1 are respectively connected with the grid electrode and the drain electrode of the first MOS transistor M1, the negative electrode of the input end of the second positive logic optical coupler OP2 is connected with the drain electrode of a first MOS transistor M1, and the input end of the second positive logic optical coupler OP2 is connected with a control signal input end; and a second capacitor C2 is connected between the positive pole and the negative pole of the direct current output end.
2. The slow start circuit for switching power supply capable of rapidly suppressing rush current as claimed in claim 1, wherein: the first MOS transistor M1 is an N-channel jfet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922301190.1U CN211018641U (en) | 2019-12-20 | 2019-12-20 | Switching power supply slow starting circuit capable of quickly restraining impact current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922301190.1U CN211018641U (en) | 2019-12-20 | 2019-12-20 | Switching power supply slow starting circuit capable of quickly restraining impact current |
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| CN211018641U true CN211018641U (en) | 2020-07-14 |
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| CN201922301190.1U Expired - Fee Related CN211018641U (en) | 2019-12-20 | 2019-12-20 | Switching power supply slow starting circuit capable of quickly restraining impact current |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310950A (en) * | 2020-10-21 | 2021-02-02 | 中国科学院长春光学精密机械与物理研究所 | Surge suppression circuit and aerospace equipment |
| CN115513930A (en) * | 2022-10-27 | 2022-12-23 | 北京瀚海科技有限公司 | Power-on protection circuit for fan |
| CN116683755A (en) * | 2023-07-28 | 2023-09-01 | 广东省洛仑兹技术股份有限公司 | Slow start circuit and multi-level slow start circuit |
-
2019
- 2019-12-20 CN CN201922301190.1U patent/CN211018641U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310950A (en) * | 2020-10-21 | 2021-02-02 | 中国科学院长春光学精密机械与物理研究所 | Surge suppression circuit and aerospace equipment |
| CN115513930A (en) * | 2022-10-27 | 2022-12-23 | 北京瀚海科技有限公司 | Power-on protection circuit for fan |
| CN116683755A (en) * | 2023-07-28 | 2023-09-01 | 广东省洛仑兹技术股份有限公司 | Slow start circuit and multi-level slow start circuit |
| CN116683755B (en) * | 2023-07-28 | 2024-01-16 | 广东省洛仑兹技术股份有限公司 | Slow start circuit and multi-level slow start circuit |
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Granted publication date: 20200714 |