CN216437052U - Switching power supply protection circuit - Google Patents
Switching power supply protection circuit Download PDFInfo
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- CN216437052U CN216437052U CN202123160305.3U CN202123160305U CN216437052U CN 216437052 U CN216437052 U CN 216437052U CN 202123160305 U CN202123160305 U CN 202123160305U CN 216437052 U CN216437052 U CN 216437052U
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Abstract
The utility model discloses a switching power supply protection circuit, include: the circuit comprises a current-limiting protection circuit, a surge suppression protection circuit, a common-mode inductor circuit, a rectifier whole bridge circuit, an electrolytic capacitor circuit and an RCD absorption circuit; one end of the current-limiting protection circuit is connected with one end of the commercial power, and the other end of the current-limiting protection circuit is electrically connected with the corresponding end of the surge suppression protection circuit; the other end of the commercial power is also electrically connected with the corresponding end of the surge suppression protection circuit; and the corresponding end of the surge suppression protection circuit is also electrically connected with the corresponding ends of the common-mode inductance circuit, the rectifying and rectifying bridge circuit, the electrolytic capacitor circuit and the RCD absorption circuit in sequence. The utility model has high safety, and the design of the fuse plays the role of current-limiting protection; the surge suppression protection circuit plays a role in suppressing surge protection, and can generate surge current at the moment of starting up; and the common-mode inductance circuit is used for filtering common-mode electromagnetic interference signals in the switching power supply, plays a role in EMI filtering and is used for inhibiting electromagnetic waves generated by the high-speed signal wire from radiating and emitting outwards.
Description
Technical Field
The utility model relates to a switching power supply technical field, in particular to switching power supply protection circuit.
Background
The switching power supply is a power supply which utilizes modern power electronic technology to control the on-off time ratio of a switching tube and maintain stable output voltage, and generally consists of a Pulse Width Modulation (PWM) control IC and a MOSFET. With the development and innovation of power electronic technology, the technology of the switching power supply is continuously innovated. At present, the switching power supply is widely applied to almost all electronic devices with the characteristics of small size, light weight and high efficiency, and is an indispensable power supply mode for the rapid development of the electronic information industry at present.
The existing switching power supply is lack of current-limiting protection, can not inhibit flowing surge current, can not inhibit electromagnetic wave generated by a high-speed signal wire from radiating and emitting outwards, has poor safety performance and easily causes potential safety hazards.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art exists, the utility model provides a switching power supply protection circuit.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
the utility model provides a switching power supply protection circuit, include: the circuit comprises a current-limiting protection circuit, a surge suppression protection circuit, a common-mode inductor circuit, a rectifier whole bridge circuit, an electrolytic capacitor circuit and an RCD absorption circuit; one end of the current-limiting protection circuit is connected with one end of the commercial power, and the other end of the current-limiting protection circuit is electrically connected with the corresponding end of the surge suppression protection circuit; the other end of the commercial power is also electrically connected with the corresponding end of the surge suppression protection circuit; and the corresponding end of the surge suppression protection circuit is also electrically connected with the corresponding ends of the common-mode inductance circuit, the rectifying and rectifying bridge circuit, the electrolytic capacitor circuit and the RCD absorption circuit in sequence.
Preferably, the current-limiting protection circuit includes a fuse F1, and one end of the fuse F1 is electrically connected to one end of the utility power.
Preferably, the surge suppression protection circuit comprises a thermistor NTC1, a piezoresistor MOV 1; one end of the thermistor NTC1 is electrically connected with the other end of the fuse F1, and the other end of the thermistor NTC1 is electrically connected with one end of the piezoresistor MOV1 respectively; the other end of the piezoresistor MOV1 is electrically connected with the other end of the commercial power.
Preferably, the common-mode inductance circuit comprises a diode D1, a diode D2, a common-mode inductance LF1, a common-mode inductance LF2, a resistor R1, a resistor R1A, a resistor R2, a resistor R2A, and a capacitor CX 1;
the common-mode inductor LF1 comprises a first coil and a second coil which are wound on a magnetic core in parallel, and the winding directions of the first coil and the second coil are opposite; the common-mode inductor LF2 comprises a third coil and a fourth coil which are wound on a magnetic core in parallel, and the winding directions of the third coil and the fourth coil are opposite;
one end of the diode D1 is electrically connected with the other end of the thermistor NTC1, one end of the varistor MOV1 and one end of the first coil respectively, and the other end of the diode D2 is electrically connected; the other end of the diode D2 is respectively and electrically connected with the other end of the piezoresistor MOV1 and the corresponding end of one end of the second coil; the other end of the first coil is electrically connected with one end of a resistor R1, one end of a resistor R1A, one end of a capacitor CX1 and one end of a third coil respectively; the other end of the second coil is respectively and electrically connected with one end of a resistor R2, one end of a resistor R2A, the other end of a capacitor CX1 and one end of a fourth coil; the other end of the resistor R1 is electrically connected with the other end of the resistor R2, the other end of the resistor R1A and the other end of the resistor R2A respectively; the other end of the third coil and the other end of the fourth coil are respectively and correspondingly electrically connected with the corresponding end of the rectifying whole bridge circuit.
Preferably, the electrolytic capacitor circuit comprises a capacitor C10, one end of the capacitor C10 is electrically connected to the fourth corresponding end of the rectifying and rectifying bridge circuit and grounded, and the other end is electrically connected to the second corresponding end of the rectifying and rectifying bridge circuit and the corresponding end of the RCD absorption circuit.
Preferably, the RCD absorption circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C1, a diode D6, and a diode D6; one end of the resistor R3 is electrically connected with a second corresponding end of the rectifying whole bridge circuit, the other end of the capacitor C10, one end of the resistor R4 and one end of the capacitor C1 respectively, and the other end of the resistor R3 is electrically connected with one end of the resistor R5, the other end of the resistor R4 and one end of the resistor R6 respectively; the other end of the resistor R5 is electrically connected with the other end of the resistor R6, one end of the diode D6, one end of the resistor R7, one end of the resistor R8 and one end of the resistor R9 respectively; the other end of the capacitor C1 is electrically connected with the other ends of the resistor R7, the resistor R8 and the resistor R9 respectively.
Adopt the technical scheme of the utility model, following beneficial effect has: the utility model has high safety, the design of the fuse plays a role of current limiting protection, and when the input current is larger than the rated current of the fuse, the fuse is disconnected to play a role of protection; the thermistor in the surge suppression protection circuit plays a role in surge suppression protection, and surge current can be generated at the moment of starting up; the voltage dependent resistor in the surge suppression protection circuit is a voltage limiting type protection device, and by utilizing the nonlinear characteristic of the voltage dependent resistor, when an overvoltage appears between two electrodes of the voltage dependent resistor, the voltage dependent resistor can clamp the voltage to a relatively fixed voltage value, so that the protection of a post-stage circuit is realized; and the common mode inductance circuit plays a role of EMI filtering and is used for inhibiting electromagnetic waves generated by the high-speed signal wire from radiating and emitting outwards.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "is connected to" the second feature
"under" may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact, but being in contact with each other through additional features between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, a switching power supply protection circuit includes: a current limiting protection circuit 101, a surge suppression protection circuit 102, a common mode inductance circuit 103, a rectifier bridge circuit 104, an electrolytic capacitor circuit 105 and an RCD absorption circuit 106; one end of the current-limiting protection circuit 101 is connected with one end of a commercial power, and the other end of the current-limiting protection circuit is electrically connected with the corresponding end of the surge suppression protection circuit 102; the other end of the commercial power is also electrically connected with the corresponding end of the surge suppression protection circuit 102; the corresponding end of the surge suppression protection circuit 102 is also electrically connected with the corresponding ends of the common-mode inductance circuit 103, the rectifier bridge circuit 104, the electrolytic capacitor circuit 105 and the RCD absorption circuit 106 in sequence.
In the embodiment, the fuse F1 plays a role in current limiting protection, and when the input current is greater than the rated current of the fuse F1, the fuse F1 is disconnected to play a role in protection; the current limiting protection circuit 101 includes a fuse F1, and one end of the fuse F1 is electrically connected to one end of the utility power.
In the embodiment, the thermistor NTC1 plays a role in suppressing surge protection, and generates surge current at the moment of starting, so that a power type NTC thermistor is connected in series in the circuit, the surge current at the time of starting can be effectively suppressed, and after the effect of suppressing the circulating surge current is completed, the resistance value of the thermistor can be reduced under the continuous action of the current, so that the consumption is low, and the normal working current cannot be influenced; the voltage dependent resistor MOV1 in this embodiment is a voltage limited protection device; by utilizing the nonlinear characteristic of the voltage dependent resistor MOV1, when an overvoltage appears between two poles of the voltage dependent resistor MOV1, the voltage dependent resistor MOV1 can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of a rear-stage circuit; the surge suppression protection circuit 102 comprises a thermistor NTC1 and a piezoresistor MOV 1; one end of the thermistor NTC1 is electrically connected with the other end of the fuse F1, and the other end of the thermistor NTC1 is electrically connected with one end of the piezoresistor MOV1 respectively; the other end of the piezoresistor MOV1 is electrically connected with the other end of the commercial power.
The common mode inductor circuit 103 in this embodiment functions as an EMI filter for suppressing the electromagnetic wave generated by the high speed signal line from being radiated outward; the winding directions of the first coil and the second coil of the common-mode inductor LF1 are opposite, and the winding directions of the third coil and the fourth coil of the common-mode inductor LF2 are opposite, so that when normal current in the circuit flows through the common-mode inductor LF1 and the common-mode inductor LF2, the current generates opposite magnetic fields in the inductance coils wound in the same phase and cancels each other, and at this time, the normal signal current is mainly affected by the resistance of the coils (and a small amount of damping caused by leakage inductance); when common mode current flows through the coil, a homodromous magnetic field is generated in the coil due to the homodromous property of the common mode current, so that the inductive reactance of the coil is increased, the coil is high-impedance, and a strong damping effect is generated, so that the common mode current is attenuated, and the purpose of filtering is achieved; the function of the X capacitor in the circuit is mainly: the design of a power supply over-line circuit, EMI filtering and a capacitor CX1 is used for eliminating differential mode interference and ensuring that a finished product of an electronic product meets the EMC requirement; the common-mode inductance circuit 103 comprises a diode D1, a diode D2, a common-mode inductance LF1, a common-mode inductance LF2, a resistor R1, a resistor R1A, a resistor R2, a resistor R2A and a capacitor CX 1; the common-mode inductor LF1 comprises a first coil and a second coil which are wound on a magnetic core in parallel, and the winding directions of the first coil and the second coil are opposite; the common-mode inductor LF2 comprises a third coil and a fourth coil which are wound on a magnetic core in parallel, and the winding directions of the third coil and the fourth coil are opposite; one end of the diode D1 is electrically connected with the other end of the thermistor NTC1, one end of the varistor MOV1 and one end of the first coil respectively, and the other end of the diode D2 is electrically connected; the other end of the diode D2 is respectively and electrically connected with the other end of the piezoresistor MOV1 and the corresponding end of one end of the second coil; the other end of the first coil is electrically connected with one end of a resistor R1, one end of a resistor R1A, one end of a capacitor CX1 and one end of a third coil respectively; the other end of the second coil is respectively and electrically connected with one end of a resistor R2, one end of a resistor R2A, the other end of a capacitor CX1 and one end of a fourth coil; the other end of the resistor R1 is electrically connected with the other end of the resistor R2, the other end of the resistor R1A and the other end of the resistor R2A respectively; the other end of the third coil and the other end of the fourth coil are respectively and correspondingly electrically connected with the corresponding end of the whole rectifying bridge circuit.
The rectifying bridge circuit 104 in this embodiment functions to rectify the ac power into dc power; the electrolytic capacitor C10 has the function that the rectifying bridge circuit converts alternating current into pulsating direct current, and an electrolytic capacitor C10 with larger capacity is connected behind the rectifying circuit, so that the rectified pulsating direct current voltage is converted into relatively stable direct current voltage by utilizing the charge-discharge characteristics of the electrolytic capacitor C10; the electrolytic capacitor circuit 105 comprises a capacitor C10, one end of the capacitor C10 is electrically connected with the fourth corresponding end of the rectifying whole bridge circuit 104 and grounded, and the other end is electrically connected with the second corresponding end of the rectifying whole bridge circuit 104 and the corresponding end of the RCD absorption circuit 105.
In this embodiment, the RCD snubber circuit 105 is used to protect the switching transistor; the RCD absorption circuit 105 comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C1, a diode D6 and a diode D6; one end of the resistor R3 is electrically connected with a second corresponding end of the rectifying whole bridge circuit, the other end of the capacitor C10, one end of the resistor R4 and one end of the capacitor C1 respectively, and the other end of the resistor R3 is electrically connected with one end of the resistor R5, the other end of the resistor R4 and one end of the resistor R6 respectively; the other end of the resistor R5 is electrically connected with the other end of the resistor R6, one end of the diode D6, one end of the resistor R7, one end of the resistor R8 and one end of the resistor R9 respectively; the other end of the capacitor C1 is electrically connected with the other ends of the resistor R7, the resistor R8 and the resistor R9 respectively.
Adopt the technical scheme of the utility model, following beneficial effect has: the utility model has high safety, the design of the fuse plays a role of current limiting protection, and when the input current is larger than the rated current of the fuse, the fuse is disconnected to play a role of protection; the thermistor in the surge suppression protection circuit plays a role in surge suppression protection, and can generate surge current at the moment of starting up; the voltage dependent resistor in the surge suppression protection circuit is a voltage limiting type protection device, and by utilizing the nonlinear characteristic of the voltage dependent resistor, when an overvoltage appears between two electrodes of the voltage dependent resistor, the voltage dependent resistor can clamp the voltage to a relatively fixed voltage value, so that the protection of a post-stage circuit is realized; and the common mode inductance circuit plays a role of EMI filtering and is used for inhibiting electromagnetic waves generated by the high-speed signal wire from radiating and emitting outwards.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (6)
1. A switching power supply protection circuit, comprising: the circuit comprises a current-limiting protection circuit, a surge suppression protection circuit, a common-mode inductor circuit, a rectifier whole bridge circuit, an electrolytic capacitor circuit and an RCD absorption circuit; one end of the current-limiting protection circuit is connected with one end of the commercial power, and the other end of the current-limiting protection circuit is electrically connected with the corresponding end of the surge suppression protection circuit; the other end of the commercial power is also electrically connected with the corresponding end of the surge suppression protection circuit; the corresponding end of the surge suppression protection circuit is also electrically connected with the corresponding ends of the common-mode inductance circuit, the rectifying and rectifying bridge circuit, the electrolytic capacitor circuit and the RCD absorption circuit in sequence.
2. The protection circuit of claim 1, wherein the current limiting protection circuit comprises a fuse F1, and one end of the fuse F1 is electrically connected to one end of a commercial power.
3. The switching power supply protection circuit of claim 2, wherein the surge suppression protection circuit comprises a thermistor NTC1, a varistor MOV 1; one end of the thermistor NTC1 is electrically connected with the other end of the fuse F1, and the other end of the thermistor NTC1 is electrically connected with one end of the piezoresistor MOV1 respectively; the other end of the piezoresistor MOV1 is electrically connected with the other end of the commercial power.
4. The protection circuit of claim 3, wherein the common mode inductor circuit comprises a diode D1, a diode D2, a common mode inductor LF1, a common mode inductor LF2, a resistor R1, a resistor R1A, a resistor R2, a resistor R2A, and a capacitor CX 1;
the common-mode inductor LF1 comprises a first coil and a second coil which are wound on a magnetic core in parallel, and the winding directions of the first coil and the second coil are opposite; the common-mode inductor LF2 comprises a third coil and a fourth coil which are wound on a magnetic core in parallel, and the winding directions of the third coil and the fourth coil are opposite;
one end of the diode D1 is electrically connected with the other end of the thermistor NTC1, one end of the varistor MOV1 and one end of the first coil respectively, and the other end of the diode D2 is electrically connected; the other end of the diode D2 is respectively and electrically connected with the other end of the piezoresistor MOV1 and the corresponding end of one end of the second coil; the other end of the first coil is electrically connected with one end of a resistor R1, one end of a resistor R1A, one end of a capacitor CX1 and one end of a third coil respectively; the other end of the second coil is respectively and electrically connected with one end of a resistor R2, one end of a resistor R2A, the other end of a capacitor CX1 and one end of a fourth coil; the other end of the resistor R1 is electrically connected with the other end of the resistor R2, the other end of the resistor R1A and the other end of the resistor R2A respectively; the other end of the third coil and the other end of the fourth coil are respectively and correspondingly electrically connected with the corresponding end of the rectifying whole bridge circuit.
5. The protection circuit of claim 4, wherein the electrolytic capacitor circuit comprises a capacitor C10, one end of the capacitor C10 is electrically connected to the fourth corresponding end of the rectifying bridge circuit and ground, and the other end is electrically connected to the second corresponding end of the rectifying bridge circuit and the corresponding end of the RCD absorption circuit.
6. The protection circuit of claim 5, wherein the RCD absorption circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C1, a diode D6, and a diode D6; one end of the resistor R3 is electrically connected with a second corresponding end of the rectifying whole bridge circuit, the other end of the capacitor C10, one end of the resistor R4 and one end of the capacitor C1 respectively, and the other end of the resistor R3 is electrically connected with one end of the resistor R5, the other end of the resistor R4 and one end of the resistor R6 respectively; the other end of the resistor R5 is electrically connected with the other end of the resistor R6, one end of the diode D6, one end of the resistor R7, one end of the resistor R8 and one end of the resistor R9 respectively; the other end of the capacitor C1 is electrically connected with the other ends of the resistor R7, the resistor R8 and the resistor R9 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123160305.3U CN216437052U (en) | 2021-12-15 | 2021-12-15 | Switching power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123160305.3U CN216437052U (en) | 2021-12-15 | 2021-12-15 | Switching power supply protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216437052U true CN216437052U (en) | 2022-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123160305.3U Active CN216437052U (en) | 2021-12-15 | 2021-12-15 | Switching power supply protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216437052U (en) |
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2021
- 2021-12-15 CN CN202123160305.3U patent/CN216437052U/en active Active
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