CN214125144U - Switch power supply anti-impact current protection circuit for power distribution terminal and switch power supply - Google Patents
Switch power supply anti-impact current protection circuit for power distribution terminal and switch power supply Download PDFInfo
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- CN214125144U CN214125144U CN202023067002.2U CN202023067002U CN214125144U CN 214125144 U CN214125144 U CN 214125144U CN 202023067002 U CN202023067002 U CN 202023067002U CN 214125144 U CN214125144 U CN 214125144U
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Abstract
The embodiment of the utility model discloses a switching power supply anti impact current protection circuit and switching power supply for distribution terminal, this circuit includes resistance R1, power tube Q1 and resistance R2; one end of the resistor R1 is connected with the rectified negative output end of a bridge rectifier BR1 of the switching power supply and the source of the power tube Q1, the other end of the resistor R1 is connected with the negative electrode of the electrolytic capacitor CD1, the drain of the power tube Q1 and the negative end HV + of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the driving circuit. The utility model discloses not only solved the power and opened the machine under the high condition of start in succession or ambient temperature and great impulse current's problem appears, reduced switching power supply's input consumption moreover by a wide margin, improved power efficiency. The utility model discloses a circuit structure is simple, and is with low costs, occupies PCB's small, and reliable and stable, suitable popularization and application.
Description
Technical Field
The embodiment of the utility model provides a relate to the electronic circuit field, especially relate to a switching power supply current protection circuit and switching power supply shocks resistance for distribution terminal.
Background
The most widely used in the power distribution terminal is a switch power supply, when the input alternating current is rectified into direct current by a rectifier bridge, the smooth direct current can be obtained by filtering by a large electrolytic capacitor, a power input loop can generate a certain impulse peak current in the process of instantly starting the rectifier and filter, the impulse peak current has a certain limit value, otherwise if the impulse current value is too large, devices such as the rectifier bridge and a filter in the power input loop can be damaged, and the larger impulse current can generate interference to other devices of a power grid and the power grid, so that the device is damaged, so the impulse current generated in the input loop of the switch power supply for the power distribution terminal must be limited, and the impulse current can not exceed a certain range value, the traditional method is that a thermistor with a negative temperature coefficient is connected in series in the input filter loop of the switch power supply, and the thermistor has a larger resistance value at the moment of starting, therefore, the whole switching power supply input rectifying circuit can not generate larger impact current, but the method has the defects that if the power supply is continuously switched on and switched off or the power supply is switched on under the condition of higher environmental temperature, the temperature of the thermistor is overhigh, the resistance value is reduced, so that the startup impact current of the power supply can exceed the set limit value, and the impact current protection function fails.
The above problems are urgently needed to be solved.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a switching power supply current protection circuit and switching power supply shocks resistance for distribution terminal solves the problem that the above background art part mentioned.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a switching power supply anti-impact current protection circuit for a power distribution terminal, including a resistor R1, a power tube Q1, and a resistor R2; one end of the resistor R1 is connected with the rectified negative output end of a bridge rectifier BR1 of the switching power supply and the source of the power tube Q1, the other end of the resistor R1 is connected with the negative electrode of the electrolytic capacitor CD1, the drain of the power tube Q1 and the negative end HV + of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the driving circuit.
Preferably, the power transistor Q1 is an N-channel MOS transistor.
The second aspect, because the switching power supply protection circuit that shocks resistance for distribution terminal that above-mentioned embodiment provided, the embodiment of the utility model provides a switching power supply is still provided, this switching power supply includes shock-resistant current protection circuit, fuse FU1, voltage transformer TVR1, electric capacity CX1, common mode inductance LB1, electric capacity CX2, thermistor RT1, bridge rectifier BR1 and electrolytic capacitor CD 2; the anti-impact current protection circuit comprises a resistor R1, a power tube Q1 and a resistor R2; one end of the fuse FU1 is connected with a power input live wire end L, the other end of the fuse FU1 is connected with one end of a voltage transformer TVR1, one end of a capacitor CX1 and a first terminal of a first coil of a common-mode inductor LB1, the other end of the voltage transformer TVR1 is connected with a power input neutral wire end N, the other end of a capacitor CX1 and a first terminal of a second coil of a common-mode inductor LB1, a second terminal of the first coil of the common-mode inductor LB1 is connected with one end of a capacitor CX2 and a first alternating current input end of a bridge rectifier BR1, a second terminal of the second coil of the common-mode inductor LB1 is connected with the other end of the capacitor CX2 and a second alternating current input end of the bridge rectifier BR1, one end of the resistor R1 is connected with a rectifying negative output end of a bridge rectifier BR1 of a switching power supply and a source of a power tube Q1, the other end of the resistor R1 is connected with a negative electrode of an electrolytic capacitor CD1, a drain of a power tube Q1 and a negative electrode HV-end of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the driving circuit, and the rectification positive electrode output end of the bridge rectifier BR1 is connected with the positive electrode of the electrolytic capacitor CD1 and the positive electrode end HV + of the switching power supply.
Preferably, the power transistor Q1 is an N-channel MOS transistor.
The utility model discloses replace thermistor series connection in distribution terminal with a fixed resistance R1 among the technical scheme in the input rectification filter circuit of switching power supply, and resistance R1's resistance does not receive the influence of temperature, the problem of great impulse current appears in the power under the condition that continuous start or ambient temperature is high has been solved, and the power tube will obtain a driving voltage after power start work, thereby the power tube switches on resistance R1 short circuit immediately, can reduce switching power supply's input consumption by a wide margin like this, and the power efficiency is improved. The utility model discloses a circuit structure is simple, and is with low costs, occupies PCB's small, and reliable and stable, suitable popularization and application.
Drawings
In order to more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the background and embodiments of the present invention will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is the utility model discloses switching power supply anti impact current protection circuit application structure chart for distribution terminal that the embodiment provided.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1, fig. 1 is an application structure diagram of a switching power supply anti-impact current protection circuit for a power distribution terminal, provided by an embodiment of the present invention.
The embodiment provides a switch power supply anti-impact current protection circuit for a power distribution terminal, which comprises a resistor R1, a power tube Q1 and a resistor R2; one end of the resistor R1 is connected with the rectified negative output end of a bridge rectifier BR1 of the switching power supply and the source of the power tube Q1, the other end of the resistor R1 is connected with the negative electrode of the electrolytic capacitor CD1, the drain of the power tube Q1 and the negative end HV + of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the driving circuit.
For example, in this embodiment, the resistance value of the resistor R1 is selected according to the surge current requirement required by the specification of the switching power supply, so as to ensure that the surge current of the switching power supply meets the required specification when the switching power supply is turned on and off frequently or the ambient temperature is high. In the embodiment, a fixed resistance value resistor R1 is adopted to replace a thermistor and is connected in series in an input rectifying and filtering loop of the switching power supply for the power distribution terminal, and the resistance value of the resistor R1 is not affected by temperature, so that the problem that the power supply is started continuously or the power supply is started at high ambient temperature to generate large impact current can be solved. In the present embodiment, the power transistor Q1 is an N-channel MOS transistor, for example. When the power supply is started to work, the power tube Q1 obtains a driving voltage Vgs through the driving circuit, the power tube Q1 is immediately turned on, and since the drain electrode D and the source electrode S of the MOS tube (i.e., the power tube Q1) are respectively connected to two ends of the resistor R1 and the on internal resistance of the MOS tube is small, the resistor R1 is short-circuited when the MOS tube is turned on, so that the input power consumption of the switching power supply can be greatly reduced, and the power supply efficiency is improved. The switch power supply anti-impact current protection circuit for the power distribution terminal in the embodiment has the advantages of simple circuit structure, low cost, small occupied PCB size, stability, reliability and suitability for popularization and application.
Example two
Based on the switching power supply current protection circuit that shocks resistance for distribution terminal that above-mentioned embodiment a provided, the utility model provides a switching power supply, as shown in fig. 1, this switching power supply includes current protection circuit, fuse FU1, voltage transformer TVR1, electric capacity CX1, common mode inductance LB1, electric capacity CX2, thermistor RT1, bridge rectifier BR1 and electrolytic capacitor CD2 that shocks resistance; the anti-impact current protection circuit comprises a resistor R1, a power tube Q1 and a resistor R2; one end of the fuse FU1 is connected with a power input live wire end L, the other end of the fuse FU1 is connected with one end of a voltage transformer TVR1, one end of a capacitor CX1 and a first terminal of a first coil of a common-mode inductor LB1, the other end of the voltage transformer TVR1 is connected with a power input neutral wire end N, the other end of a capacitor CX1 and a first terminal of a second coil of a common-mode inductor LB1, a second terminal of the first coil of the common-mode inductor LB1 is connected with one end of a capacitor CX2 and a first alternating current input end of a bridge rectifier BR1, a second terminal of the second coil of the common-mode inductor LB1 is connected with the other end of the capacitor CX2 and a second alternating current input end of the bridge rectifier BR1, one end of the resistor R1 is connected with a rectifying negative output end of a bridge rectifier BR1 of a switching power supply and a source of a power tube Q1, the other end of the resistor R1 is connected with a negative electrode of an electrolytic capacitor CD1, a drain of a power tube Q1 and a negative electrode HV-end of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the driving circuit, and the rectification positive electrode output end of the bridge rectifier BR1 is connected with the positive electrode of the electrolytic capacitor CD1 and the positive electrode end HV + of the switching power supply.
In the embodiment, the switch power supply solves the problem that the power supply has larger impact current when being started continuously or being started under the condition of high ambient temperature by adding the impact current protection circuit, greatly reduces the input power consumption of the switch power supply and improves the power supply efficiency. Specifically, in this embodiment, the resistance value of the resistor R1 is a value selected according to the impact current required by the technical specification of the switching power supply, so that the impact current of the switching power supply can meet the required technical specification when the switching power supply is turned on and off frequently or the ambient temperature is high. In the embodiment, a fixed resistance value resistor R1 is adopted to replace a thermistor and is connected in series in an input rectifying and filtering loop of the switching power supply for the power distribution terminal, and the resistance value of the resistor R1 is not affected by temperature, so that the problem that the power supply is started continuously or the power supply is started at high ambient temperature to generate large impact current can be solved. In the present embodiment, the power transistor Q1 is an N-channel MOS transistor, for example. When the power supply is started to work, the power tube Q1 obtains a driving voltage Vgs through the driving circuit, the power tube Q1 is immediately turned on, and since the drain electrode D and the source electrode S of the MOS tube (i.e., the power tube Q1) are respectively connected to two ends of the resistor R1 and the on internal resistance of the MOS tube is small, the resistor R1 is short-circuited when the MOS tube is turned on, so that the input power consumption of the switching power supply can be greatly reduced, and the power supply efficiency is improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (4)
1. The switch power supply anti-impact current protection circuit for the power distribution terminal is characterized by comprising a resistor R1, a power tube Q1 and a resistor R2; one end of the resistor R1 is connected with the rectified negative output end of a bridge rectifier BR1 of the switching power supply and the source of the power tube Q1, the other end of the resistor R1 is connected with the negative electrode of the electrolytic capacitor CD1, the drain of the power tube Q1 and the negative end HV + of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the driving circuit.
2. The anti-impact current protection circuit of the switching power supply for the power distribution terminal, according to claim 1, is characterized in that the power transistor Q1 is an N-channel MOS transistor.
3. A switching power supply is characterized by comprising an anti-impact current protection circuit, a fuse FU1, a voltage transformer TVR1, a capacitor CX1, a common mode inductor LB1, a capacitor CX2, a thermistor RT1, a bridge rectifier BR1 and an electrolytic capacitor CD 2; the anti-impact current protection circuit comprises a resistor R1, a power tube Q1 and a resistor R2; one end of the fuse FU1 is connected with a power input live wire end L, the other end of the fuse FU1 is connected with one end of a voltage transformer TVR1, one end of a capacitor CX1 and a first terminal of a first coil of a common-mode inductor LB1, the other end of the voltage transformer TVR1 is connected with a power input neutral wire end N, the other end of a capacitor CX1 and a first terminal of a second coil of a common-mode inductor LB1, a second terminal of the first coil of the common-mode inductor LB1 is connected with one end of a capacitor CX2 and a first alternating current input end of a bridge rectifier BR1, a second terminal of the second coil of the common-mode inductor LB1 is connected with the other end of the capacitor CX2 and a second alternating current input end of the bridge rectifier BR1, one end of the resistor R1 is connected with a rectifying negative output end of a bridge rectifier BR1 of a switching power supply and a source of a power tube Q1, the other end of the resistor R1 is connected with a negative electrode of an electrolytic capacitor CD1, a drain of a power tube Q1 and a negative electrode HV-end of the switching power supply, the grid of the power tube Q1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the driving circuit, and the rectification positive electrode output end of the bridge rectifier BR1 is connected with the positive electrode of the electrolytic capacitor CD1 and the positive electrode end HV + of the switching power supply.
4. The switching power supply according to claim 3, wherein said power transistor Q1 is an N-channel MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023067002.2U CN214125144U (en) | 2020-12-17 | 2020-12-17 | Switch power supply anti-impact current protection circuit for power distribution terminal and switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023067002.2U CN214125144U (en) | 2020-12-17 | 2020-12-17 | Switch power supply anti-impact current protection circuit for power distribution terminal and switch power supply |
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| Publication Number | Publication Date |
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| CN214125144U true CN214125144U (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023067002.2U Active CN214125144U (en) | 2020-12-17 | 2020-12-17 | Switch power supply anti-impact current protection circuit for power distribution terminal and switch power supply |
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| CN (1) | CN214125144U (en) |
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