CN214591197U - Switching power supply circuit capable of restraining surge current - Google Patents
Switching power supply circuit capable of restraining surge current Download PDFInfo
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- CN214591197U CN214591197U CN202120408220.3U CN202120408220U CN214591197U CN 214591197 U CN214591197 U CN 214591197U CN 202120408220 U CN202120408220 U CN 202120408220U CN 214591197 U CN214591197 U CN 214591197U
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Abstract
The utility model discloses a switching power supply circuit capable of inhibiting surge current, which comprises a rectifier module, wherein the input end of the rectifier module is connected with an external power supply; the peak absorption module is connected with the output end of the rectification module; the control module is connected with the peak absorption module; the input end of the transformer T1 is respectively connected with the peak absorption module and the control module, and the output end of the transformer T1 is connected with an external load; the surge current suppression module is connected with the control module and used for delaying the output time of the control module so as to reduce the duty ratio signal output by the control module at the power-on moment; by adding the surge current suppression module in the preceding stage circuit of the switching power supply, the output time of the control module can be delayed to reduce the duty ratio signal output by the control module at the power-on moment, and the electronic components and the electronic devices are prevented from being damaged due to overlarge surge current at the power-on moment.
Description
Technical Field
The utility model relates to a switching power supply field, in particular to switching power supply circuit that can restrain surge current.
Background
In electronic circuit, switching power supply's input circuit mostly adopts the rectification to add electric capacity filter circuit, because initial voltage on the condenser is zero, at the switching power supply initial power-on moment, input voltage charges the condenser, can form very big instantaneous impulse surge current, often can lead to power input end fuse to blow or current-limiting protection circuit start-up protection, will cause the circuit can not normally work, and surge current is too big moreover, can reduce the life-span of condenser and damage components and parts.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a can restrain surge current's switching power supply circuit.
The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: a switching power supply circuit that suppresses an inrush current, comprising:
the input end of the rectification module is connected with an external power supply;
the peak absorption module is connected with the output end of the rectification module;
the control module is connected with the peak absorption module;
the input end of the transformer T1 is respectively connected with the peak absorption module and the control module, and the output end of the transformer T1 is connected with an external load;
and the surge current suppression module is connected with the control module and used for delaying the output time of the control module so as to reduce the duty ratio signal output by the control module at the power-on moment.
The control module comprises a switching power supply chip U1, a resistor R4-5 and a MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the output end of the switching power supply chip U1 through a resistor R4, the drain electrode of the MOS tube Q1 is connected with the peak absorption module, the source electrode of the MOS tube Q1 is respectively connected with one end of the resistor R5 and the feedback end of the switching power supply chip U1, and the other end of the resistor R5 is grounded.
The surge current suppression module comprises a resistor R2-3, a capacitor C1 and an NPN triode Q2, wherein one end of the resistor R2 is connected with one end of a capacitor C1 and a power supply end of a switching power supply chip U1 respectively, the other end of the resistor R2 is connected with one end of a capacitor C1 and one end of a resistor R3 respectively, the other end of the resistor R3 is connected with a base electrode of the NPN triode Q2, a collector electrode of the NPN triode Q2 is connected with a grid electrode of the MOS transistor Q1 and an output end of the switching power supply chip U1 respectively, and an emitter electrode of the NPN triode Q2 is grounded.
The switching power supply circuit capable of suppressing surge current further comprises a diode D1, an electrolytic capacitor EC2 and a capacitor C3, wherein the anode of the diode D1 is connected with one end of an N3 winding of a transformer T1, the cathode of the diode D1 is respectively connected with the anode of the electrolytic capacitor EC2, one end of the capacitor C3 and the power supply end of a switching power supply chip U1, the other end of the capacitor C3 is grounded, and the cathode of the electrolytic capacitor EC2 is respectively connected with the ground end and the other end of an N3 winding of the transformer T1.
The peak absorption module comprises a resistor R6-7, a capacitor C2 and a diode D2, wherein one end of the resistor R6 is connected with the output end of the rectification module, one end of the resistor R7, one end of the capacitor C2 and one end of an N1 winding of a transformer T1, the other end of the resistor R6 is connected with the other end of the resistor R7, the other end of the capacitor C2 and a cathode of the diode D2, and an anode of the diode D2 is connected with the other end of the N1 winding of the transformer T1 and the control module.
The switching power supply circuit capable of suppressing surge current also comprises an output filter module respectively connected with the N2 winding of the transformer T1 and an external load.
The output filtering module comprises a diode D3, an electrolytic capacitor EC3 and a capacitor C4, wherein the anode of the diode D3 is connected with one end of an N2 winding of the transformer T1, the cathode of the diode D3 is respectively connected with the anode of the electrolytic capacitor EC3, one end of the capacitor C4 and one end of an external load, and the cathode of the electrolytic capacitor EC3 is respectively connected with the other end of the N2 winding of the transformer T1, the other end of the capacitor C4 and the other end of the external load.
The utility model has the advantages that: a switching power supply circuit capable of suppressing surge current comprises a rectification module, an input end of which is connected with an external power supply; the peak absorption module is connected with the output end of the rectification module; the control module is connected with the peak absorption module; the input end of the transformer T1 is respectively connected with the peak absorption module and the control module, and the output end of the transformer T1 is connected with an external load; the surge current suppression module is connected with the control module and used for delaying the output time of the control module so as to reduce the duty ratio signal output by the control module at the power-on moment; by adding the surge current suppression module in the preceding stage circuit of the switching power supply, the output time of the control module can be delayed to reduce the duty ratio signal output by the control module at the power-on moment, and the electronic components and the electronic devices are prevented from being damaged due to overlarge surge current at the power-on moment.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic circuit diagram of a switching power supply circuit capable of suppressing an inrush current.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1, a switching power supply circuit capable of suppressing an inrush current includes:
a rectifying module 10, an input end of which is connected with an external power supply;
the peak absorption module 40 is connected with the output end of the rectification module 10;
the control module 20 is connected with the peak absorption module 40;
a transformer T1, the input end of which is connected to the spike absorbing module 40 and the control module 20, respectively, and the output end of which is connected to an external load;
and the inrush current suppression module 30 is connected with the control module 20 and is used for delaying the output time of the control module 20 so as to reduce the duty ratio signal output by the control module 20 at the moment of power-on.
The control module 20 comprises a switching power supply chip U1, a resistor R4-5 and a MOS transistor Q1, wherein the gate of the MOS transistor Q1 is connected with the output end of the switching power supply chip U1 through the resistor R4, the drain of the MOS transistor Q1 is connected with the peak absorption module 40, the source of the MOS transistor Q1 is respectively connected with one end of the resistor R5 and the feedback end of the switching power supply chip U1, and the other end of the resistor R5 is grounded.
The surge current suppression module 30 includes a resistor R2-3, a capacitor C1, and an NPN transistor Q2, wherein one end of the resistor R2 is connected to one end of the capacitor C1 and a power supply terminal of the switching power supply chip U1, the other end of the resistor R2 is connected to one end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is connected to a base of the NPN transistor Q2, a collector of the NPN transistor Q2 is connected to a gate of the MOS transistor Q1 and an output terminal of the switching power supply chip U1, and an emitter of the NPN transistor Q2 is grounded.
The switching power supply circuit capable of suppressing surge current further comprises a diode D1, an electrolytic capacitor EC2 and a capacitor C3, wherein the anode of the diode D1 is connected with one end of an N3 winding of a transformer T1, the cathode of the diode D1 is respectively connected with the anode of the electrolytic capacitor EC2, one end of the capacitor C3 and the power supply end of a switching power supply chip U1, the other end of the capacitor C3 is grounded, and the cathode of the electrolytic capacitor EC2 is respectively connected with the ground end and the other end of an N3 winding of the transformer T1.
The peak absorption module 40 includes a resistor R6-7, a capacitor C2, and a diode D2, wherein one end of the resistor R6 is connected to the output end of the rectifier module 10, one end of the resistor R7, one end of the capacitor C2, and one end of the N1 winding of the transformer T1, the other end of the resistor R6 is connected to the other end of the resistor R7, the other end of the capacitor C2, and the cathode of the diode D2, and the anode of the diode D2 is connected to the other end of the N1 winding of the transformer T1, and the control module 20.
A switching power supply circuit capable of suppressing an inrush current further includes an output filter module 50 connected to an N2 winding of a transformer T1 and an external load, respectively.
The output filter module 50 comprises a diode D3, an electrolytic capacitor EC3 and a capacitor C4, wherein the anode of the diode D3 is connected with one end of the N2 winding of the transformer T1, the cathode of the diode D3 is respectively connected with the anode of the electrolytic capacitor EC3, one end of the capacitor C4 and one end of an external load, and the cathode of the electrolytic capacitor EC3 is respectively connected with the other end of the N2 winding of the transformer T1, the other end of the capacitor C4 and the other end of the external load.
The working principle of the utility model is as follows:
when the system is powered on, L, N is connected to the two ends of the AC input of the rectifier bridge DB1 through terminals, the electrolytic capacitor EC1 is charged after being rectified by the rectifier bridge DB1, meanwhile, the resistor R1 is connected with the 4 pins of the high-voltage starting interface of the switching power supply chip U1, the internal circuit of the switching power supply chip U1 is charged, and the switching power supply chip U1 starts to be started after the starting voltage is reached; the output end of the switching power supply chip U1 outputs a duty ratio driving signal to the gate of the MOS tube Q1, the driving MOS tube Q1 chops the N1 winding of the transformer T1, meanwhile, the N3 winding of the transformer T1 induces voltage, the voltage is rectified through the diode D1 and filtered through the electrolytic capacitor EC2, the voltage on the electrolytic capacitor EC2 is also connected to the base electrode of the NPNNPN triode Q2 through the capacitor C1 and the resistor R3, so that the NPN triode Q2 is conducted to pull down the driving signal of the gate of the MOS tube Q1, the MOS tube Q1 is conducted in a delayed mode, and the situation that the output end of the power-on switching power supply chip U1 outputs a large duty ratio signal to drive the MOS tube Q1, so that the power-on instantaneous current is too large to cause electronic surge and damage; when the capacitor C1 is fully charged with voltage, the NPN triode Q2 is cut off and conducted, the output end of the switching power supply chip U1 continues to output a duty ratio driving signal to drive the MOS tube Q1, and chopping is carried out on an N1 winding of the transformer T1; the N3 winding of the transformer T1 continuously induces voltage, is rectified by a diode D1, and is filtered by an electrolytic capacitor EC2 and a capacitor C3 to supply power to a power supply end of a switching power supply chip U1; meanwhile, a resistor R5 converts a detected current signal on the MOS transistor Q1 into a voltage signal and feeds the voltage signal back to a feedback end of a switching power supply chip U1, a winding N2 of a transformer T1 induces voltage, the voltage is rectified through a diode D3 and filtered through an electrolytic capacitor EC3 and a capacitor C4 to supply power to an external load, and the voltage on the drain electrode of the MOS transistor Q1 is clamped in a safe voltage range through the diode D2, a resistor R6-7 and the capacitor C2; after the system is powered off, the voltage on the capacitor C1 is discharged through the resistor R2-3, and the charging is continued when the system is powered on next time.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.
Claims (7)
1. A switching power supply circuit capable of suppressing an inrush current, comprising:
a rectifier module (10) having an input terminal connected to an external power supply;
the peak absorption module (40) is connected with the output end of the rectification module (10);
a control module (20) connected to the spike absorption module (40);
a transformer T1, the input end of which is connected with the peak absorption module (40) and the control module (20), respectively, and the output end of which is connected with an external load;
the surge current suppression module (30) is connected with the control module (20) and used for delaying the output time of the control module (20) so as to reduce the size of a duty ratio signal output by the control module (20) at the moment of power-on.
2. A switching power supply circuit capable of suppressing an inrush current as claimed in claim 1, wherein: the control module (20) comprises a switching power supply chip U1, a resistor R4-5 and a MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the output end of the switching power supply chip U1 through a resistor R4, the drain electrode of the MOS tube Q1 is connected with the peak absorption module (40), the source electrode of the MOS tube Q1 is respectively connected with one end of the resistor R5 and the feedback end of the switching power supply chip U1, and the other end of the resistor R5 is grounded.
3. A switching power supply circuit capable of suppressing an inrush current as claimed in claim 2, wherein: the surge current suppression module (30) comprises a resistor R2-3, a capacitor C1 and an NPN triode Q2, wherein one end of the resistor R2 is connected with one end of the capacitor C1 and a power supply end of a switching power supply chip U1, the other end of the resistor R2 is connected with one end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is connected with a base electrode of the NPN triode Q2, a collector electrode of the NPN triode Q2 is connected with a grid electrode of the MOS transistor Q1 and an output end of the switching power supply chip U1, and an emitter electrode of the NPN triode Q2 is grounded.
4. A switching power supply circuit capable of suppressing an inrush current as claimed in claim 2, wherein: the high-voltage switch power supply further comprises a diode D1, an electrolytic capacitor EC2 and a capacitor C3, wherein the anode of the diode D1 is connected with one end of the N3 winding of the transformer T1, the cathode of the diode D1 is respectively connected with the anode of the electrolytic capacitor EC2, one end of the capacitor C3 and the power supply end of the switching power supply chip U1, the other end of the capacitor C3 is grounded, and the cathode of the electrolytic capacitor EC2 is respectively connected with the ground end and the other end of the N3 winding of the transformer T1.
5. A switching power supply circuit capable of suppressing an inrush current as claimed in claim 1, wherein: the peak absorption module (40) comprises a resistor R6-7, a capacitor C2 and a diode D2, one end of the resistor R6 is connected with the output end of the rectification module (10), one end of the resistor R7, one end of the capacitor C2 and one end of an N1 winding of a transformer T1, the other end of the resistor R6 is connected with the other end of the resistor R7, the other end of the capacitor C2 and a cathode of the diode D2, and an anode of the diode D2 is connected with the other end of the N1 winding of the transformer T1 and the control module (20).
6. A switching power supply circuit capable of suppressing an inrush current as claimed in claim 1, wherein: also included is an output filtering module (50) connected to the N2 winding of the transformer T1 and an external load, respectively.
7. The switching power supply circuit capable of suppressing an inrush current as claimed in claim 6, wherein: the output filtering module (50) comprises a diode D3, an electrolytic capacitor EC3 and a capacitor C4, wherein the anode of the diode D3 is connected with one end of an N2 winding of the transformer T1, the cathode of the diode D3 is respectively connected with the anode of the electrolytic capacitor EC3, one end of the capacitor C4 and one end of an external load, and the cathode of the electrolytic capacitor EC3 is respectively connected with the other end of the N2 winding of the transformer T1, the other end of the capacitor C4 and the other end of the external load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120408220.3U CN214591197U (en) | 2021-02-24 | 2021-02-24 | Switching power supply circuit capable of restraining surge current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120408220.3U CN214591197U (en) | 2021-02-24 | 2021-02-24 | Switching power supply circuit capable of restraining surge current |
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| Publication Number | Publication Date |
|---|---|
| CN214591197U true CN214591197U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120408220.3U Active CN214591197U (en) | 2021-02-24 | 2021-02-24 | Switching power supply circuit capable of restraining surge current |
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| Country | Link |
|---|---|
| CN (1) | CN214591197U (en) |
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2021
- 2021-02-24 CN CN202120408220.3U patent/CN214591197U/en active Active
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