CN213027432U - Power protection circuit of alternating current-direct current conversion circuit - Google Patents
Power protection circuit of alternating current-direct current conversion circuit Download PDFInfo
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- CN213027432U CN213027432U CN202021939710.8U CN202021939710U CN213027432U CN 213027432 U CN213027432 U CN 213027432U CN 202021939710 U CN202021939710 U CN 202021939710U CN 213027432 U CN213027432 U CN 213027432U
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Abstract
The utility model relates to a protection field especially relates to a power protection circuit of alternating current-direct current converting circuit, including external impact protection circuit and inside impact protection circuit, wherein, external impact protection circuit is including exchanging protection circuit (101), exchanging anti-jamming circuit (102) and direct current anti-jamming circuit (103), inside impact protection circuit includes switch sub-circuit (201), control sub-circuit (202) and buffer sub-circuit (203). The application provides an alternating current-direct current conversion circuit's power protection circuit is used for solving outside thunderbolt surge and inside and go up the problem that the surge can not protect, circuit security is low simultaneously of going up the electric surge in the twinkling of an eye.
Description
Technical Field
The application relates to the field of protection, in particular to a power supply protection circuit of an alternating current-direct current conversion circuit.
Background
In the field of Electromagnetic Compatibility (EMC), that is, anti-interference comprehensive protection, no matter external lightning surge or internal power-on instant surge, the method provides greater challenges for the safety of circuits and the stability of components.
At present, most protection circuits mainly protect against external lightning surge impact, and elements such as safety capacitors and the like are generally adopted to filter differential mode noise and common mode noise. The protection performance of the surge protector is insufficient for the impact such as overcurrent and overvoltage caused by external lightning surge, and the surge protector cannot protect the surge impact at the moment of internal electrification.
SUMMERY OF THE UTILITY MODEL
The application provides a power protection circuit of an alternating current-direct current conversion circuit for solve the problems that external lightning surge and internal power-on instant surge can not be protected simultaneously and circuit safety is low.
In a first aspect, an embodiment of the present application provides a power protection circuit for an ac-dc conversion circuit, including an external impact protection circuit and an internal impact protection circuit, where the external impact protection circuit includes an ac protection circuit, an ac anti-jamming circuit, and a dc anti-jamming circuit, and the internal impact protection circuit includes a switch sub-circuit, a control sub-circuit, and a buffer sub-circuit;
the alternating current protection circuit is connected in parallel with a primary coil of a first transformer in the alternating current-direct current conversion circuit; the alternating current anti-jamming circuit is connected with a secondary coil of the first transformer in the alternating current-direct current conversion circuit in parallel; the direct current anti-jamming circuit is connected with a main circuit power supply input end in the alternating current-direct current conversion circuit in parallel; the first end of the switch sub-circuit is connected with the high-voltage side of the output end of a first rectifier bridge in the alternating current-direct current conversion circuit, and the first end of the switch sub-circuit is connected with the high-voltage side of the input end of the main circuit power supply; the control sub-circuit is connected with the input end of the first rectifier bridge in parallel; the buffer sub-circuit is connected with the power supply input end of the main circuit in parallel.
Optionally, the alternating current protection circuit includes an overcurrent protection sub-circuit, an overvoltage protection sub-circuit, a differential mode protection sub-circuit, a clamp sub-circuit, and a common mode protection sub-circuit;
the over-current protection sub-circuit is connected in series with a power supply live wire; the first end of the overvoltage protection sub-circuit is connected with the live wire of the power supply after being connected with the overcurrent protection sub-circuit in series, and the second end of the overvoltage protection sub-circuit is connected with the zero line of the power supply; the first end of the input side of the differential mode protection sub-circuit is connected with the first end of the overvoltage protection sub-circuit, and the second end of the input side of the differential mode protection sub-circuit is connected with the second end of the overvoltage protection sub-circuit; the first end of the clamping sub-circuit is connected with the first end of the output side of the differential mode protection sub-circuit, and the second end of the clamping sub-circuit is connected with the second end of the output side of the differential mode protection sub-circuit; the first end of the input side of the common mode protection sub-circuit is connected with the first end of the clamping sub-circuit, the second end of the input side of the common mode protection sub-circuit is connected with the second end of the clamping sub-circuit, the first end of the output side of the common mode protection sub-circuit is connected with a live wire end of a primary coil of the first transformer, and the second end of the output side of the common mode protection sub-circuit is connected with a zero line end of the primary coil of the first transformer.
Optionally, the over-current protection sub-circuit is a fuse; the fuse is connected in series with a live wire of a power supply.
Optionally, the overvoltage protection sub-circuit comprises a first varistor, a second varistor, a third varistor, a first gas discharge tube and a second gas discharge tube;
the first end of the first piezoresistor is connected with the live wire of the power supply after the fuse is connected in series, and the second end of the first piezoresistor is connected with the first end of the first gas discharge tube; the second end of the first gas discharge tube is connected with a power supply zero line; the first end of the second piezoresistor is connected with the power supply zero line, and the second end of the second piezoresistor is connected with the first end of the second gas discharge tube; the first end of the third piezoresistor is connected with the live power wire of the power supply, and the second end of the third piezoresistor is connected with the first end of the second gas discharge tube; and the second end of the second gas discharge tube is connected with the ground wire.
Optionally, the differential-mode protection sub-circuit includes a first differential-mode inductor, a second differential-mode inductor, a first differential-mode capacitor, and a second differential-mode capacitor;
the first differential mode inductor is connected in series with the live wire of the power supply, and the second differential mode inductor is connected in series with the zero line of the power supply; a first end of the first differential mode capacitor is connected with a first end of the first differential mode inductor, and a second end of the first differential mode capacitor is connected with a first end of the second differential mode inductor; a first end of the second differential mode capacitor is connected to a second end of the first differential mode inductor, and a second end of the second differential mode capacitor is connected to a second end of the second differential mode inductor.
Optionally, the clamping subcircuit includes a first bidirectional diode, a second bidirectional diode, and a second bidirectional diode;
a first end of the first bidirectional diode is connected with a second end of the first differential-mode inductor, and a second end of the first bidirectional diode is connected with a second end of the second differential-mode inductor; a first end of the second bidirectional diode is connected with a second end of the second differential mode inductor, and a second end of the second bidirectional diode is connected with the ground wire; and the first end of the third bidirectional diode is connected with the second end of the first differential-mode inductor, and the second end of the third bidirectional diode is connected with the ground wire.
Optionally, the common mode protection sub-circuit includes an electromagnetic interference filter, a first common mode capacitor, a second common mode capacitor, a third common mode capacitor, a fourth common mode capacitor, a fifth common mode capacitor, and a sixth common mode capacitor;
the first end of the input side of the electromagnetic interference filter is connected with the second end of the first differential mode inductor, the second end of the input side of the electromagnetic interference filter is connected with the second end of the second differential mode inductor, the first end of the output side of the electromagnetic interference filter is connected with a primary side coil live wire end of the first transformer, and the second end of the output side of the electromagnetic interference filter is connected with a primary side coil zero line end of the first transformer; the first end of the first common-mode capacitor is connected with the first end of the input side of the electromagnetic interference filter, and the second end of the first common-mode capacitor is connected with the second end of the input side of the electromagnetic interference filter; the first end of the second common-mode capacitor is connected with the first end of the input side of the electromagnetic interference filter, and the second end of the second common-mode capacitor is connected with the ground wire; the first end of the third common-mode capacitor is connected with the second end of the input side of the electromagnetic interference filter, and the second end of the third common-mode capacitor is connected with the ground wire; a first end of the fourth common-mode capacitor is connected with a first end of the output side of the electromagnetic interference filter, and a second end of the fourth common-mode capacitor is connected with a second end of the output side of the electromagnetic interference filter; a first end of the fifth common-mode capacitor is connected with a first end of the output side of the electromagnetic interference filter, and a second end of the fifth common-mode capacitor is connected with the ground wire; and the first end of the sixth common-mode capacitor is connected with the second end of the output side of the electromagnetic interference filter, and the second end of the sixth common-mode capacitor is connected with the ground wire.
Optionally, the switch sub-circuit comprises a relay contact and a delay resistor;
the first end of the delay resistor is connected with the high-voltage side of the output end of the first rectifier bridge, and the first end of the delay resistor is connected with the high-voltage side of the input end of the main circuit power supply; the relay contact is connected with the delay resistor in parallel.
Optionally, the control sub-circuit includes a second transformer, a second rectifier bridge, a timing sub-circuit, a relay coil, a voltage regulator sub-circuit, and a triode amplifier;
the fire wire end of the primary coil of the second transformer is connected with the second end of a main switch in the alternating current-direct current conversion circuit, and the zero wire end of the primary coil of the second transformer is connected with the zero wire end of the secondary coil of the first transformer; the input end of the second rectifier bridge is connected with the secondary coil of the second transformer in parallel; the input end of the voltage-stabilizing sub-circuit is connected with the high-voltage side of the output end of the second rectifier bridge, the grounding end of the voltage-stabilizing sub-circuit is connected with the low-voltage side of the output end of the second rectifier bridge, and the output end of the voltage-stabilizing sub-circuit is connected with the input end of the timing sub-circuit; the grounding end of the timing sub-circuit is connected with the low-voltage side of the output end of the second rectifier bridge, and the output end of the timing sub-circuit is connected with the control end of the triode amplifier; the emitter of the triode amplifier is connected with the low-voltage side of the output end of the second rectifier bridge, and the collector of the triode amplifier is connected with the first end of the relay coil; and the second end of the relay coil is connected with the output end of the voltage-stabilizing sub-circuit.
Optionally, the buffer sub-circuit is a buffer capacitor.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: the protection circuit provided by the embodiment of the application can filter external lightning surge or internal power-on instant surge, ensures that a main circuit of the alternating current-direct current conversion circuit is not interfered, enhances the anti-interference performance of the circuit, and further ensures the system safety of the alternating current-direct current conversion circuit.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic diagram of an ac-dc conversion circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a power protection circuit of an ac-dc conversion circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an ac protection circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic connection diagram of components of a power protection circuit of an ac-dc conversion circuit provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The power protection circuit of alternating current-direct current converting circuit that this application embodiment provided is to when running into outside thunderbolt surge and inside power-on surge in twinkling of an eye, the circuit that protects to alternating current-direct current converting circuit. As shown in fig. 1, the ac-dc conversion circuit includes a first transformer (301), a main switch (302), a first rectifier bridge (303), and a main circuit (304).
In one embodiment, as shown in fig. 2, the power protection circuit of the ac-dc conversion circuit includes an external surge protection circuit and an internal surge protection circuit, where the external surge protection circuit includes an ac protection circuit (101), an ac anti-jamming circuit (102), and a dc anti-jamming circuit (103), and the internal surge protection circuit includes a switch sub-circuit (201), a control sub-circuit (202), and a buffer sub-circuit (203).
The alternating current protection circuit (101) is connected in parallel with a primary coil of a first transformer (301) in the alternating current-direct current conversion circuit. The alternating current anti-jamming circuit (102) is connected in parallel with a secondary side coil of a first transformer (301) in the alternating current-direct current conversion circuit. The direct current anti-interference circuit (103) is connected in parallel with the power supply input end of the main circuit (304) in the alternating current-direct current conversion circuit. The first end of the switch sub-circuit (201) is connected with the high-voltage side of the output end of a first rectifier bridge (303) in the alternating current-direct current conversion circuit, and the first end of the switch sub-circuit (201) is connected with the high-voltage side of the power supply input end of the main circuit (304). The control sub-circuit (202) is connected in parallel with the input of the first rectifier bridge (303). The buffer sub-circuit (203) is connected in parallel with the power input terminal of the main circuit (304).
In one embodiment, as shown in fig. 3, the ac protection circuit (101) includes an overcurrent protection sub-circuit (1011), an overvoltage protection sub-circuit (1012), a differential mode protection sub-circuit (1013), a clamp sub-circuit (1014), and a common mode protection sub-circuit (1015).
The over-current protection sub-circuit (1011) is connected in series with the live wire of the power supply. The first end of the overvoltage protection sub-circuit (1012) is connected with a power supply live wire which is connected with the overcurrent protection sub-circuit (1011) in series, and the second end of the overvoltage protection sub-circuit (1012) is connected with a power supply zero wire. The first end of the input side of the differential mode protection sub-circuit (1013) is connected with the first end of the overvoltage protection sub-circuit (1012), and the second end of the input side of the differential mode protection sub-circuit (1013) is connected with the second end of the overvoltage protection sub-circuit (1012). The first end of the clamping subcircuit (1014) is connected with the first end of the output side of the differential mode protection subcircuit (1013), and the second end of the clamping subcircuit (1014) is connected with the second end of the output side of the differential mode protection subcircuit (1013). The first end of the input side of the common mode protection sub-circuit (1015) is connected with the first end of the clamping sub-circuit (1014), the second end of the input side of the common mode protection sub-circuit (1015) is connected with the second end of the clamping sub-circuit (1014), the first end of the output side of the common mode protection sub-circuit (1015) is connected with the live wire end of the primary side coil of the first transformer (301), and the second end of the output side of the common mode protection sub-circuit (1015) is connected with the null wire end of the primary side coil of the first transformer (301).
In one embodiment, as shown in fig. 4, the over-current protection sub-circuit (1011) is a fuse (1).
In this embodiment, the overvoltage protection sub-circuit (1012) includes a first voltage dependent resistor (2), a second voltage dependent resistor (4), a third voltage dependent resistor (5), a first gas discharge tube (3), and a second gas discharge tube (6).
The first end of the first piezoresistor (2) is connected with a power live wire after the fuse (1) is connected in series, and the second end of the first piezoresistor (2) is connected with the first end of the first gas discharge tube (3). The second end of the first gas discharge tube (3) is connected with a power supply zero line. The first end of the second piezoresistor (4) is connected with a power supply zero line, and the second end of the second piezoresistor (4) is connected with the first end of the second gas discharge tube (6). The first end of the third piezoresistor (5) is connected with a power live wire, and the second end of the third piezoresistor (5) is connected with the first end of the second gas discharge tube (6). The second end of the second gas discharge tube (6) is connected to the ground.
In the embodiment, the first gas discharge tube (3) and the second gas discharge tube (6) both adopt novel open-circuit failure gas discharge tubes.
In this embodiment, the differential mode protection sub-circuit (1013) includes a first differential mode inductor (8), a second differential mode inductor (9), a first differential mode capacitor (7), and a second differential mode capacitor (10).
The first differential mode inductor (8) is connected in series with a power supply live wire, and the second differential mode inductor (9) is connected in series with a power supply zero wire. The first end of the first differential mode capacitor (7) is connected with the first end of the first differential mode inductor (8), and the second end of the first differential mode capacitor (7) is connected with the first end of the second differential mode inductor (9). The first end of the second differential mode capacitor (10) is connected to the second end of the first differential mode inductor (8), and the second end of the second differential mode capacitor (10) is connected to the second end of the second differential mode inductor (9).
In this embodiment, the clamp subcircuit (1014) includes a first bidirectional diode (13), a second bidirectional diode (11), and a second bidirectional diode (12).
The first end of the first bidirectional diode (13) is connected with the second end of the first differential mode inductor (8), and the second end of the first bidirectional diode (13) is connected with the second end of the second differential mode inductor (9). The first end of the second bidirectional diode (11) is connected with the second end of the second differential mode inductor (9), and the second end of the second bidirectional diode (11) is connected with the ground wire. The first end of the third bidirectional diode (12) is connected with the second end of the first differential mode inductor (8), and the second end of the third bidirectional diode (12) is connected with the ground wire.
In this embodiment, the common mode protection sub-circuit (1015) includes an electromagnetic interference filter (16), a first common mode capacitor (13), a second common mode capacitor (14), a third common mode capacitor (15), a fourth common mode capacitor (17), a fifth common mode capacitor (18), and a sixth common mode capacitor (19).
The first end of the input side of the electromagnetic interference filter (16) is connected with the second end of the first differential mode inductor (8), the second end of the input side of the electromagnetic interference filter (16) is connected with the second end of the second differential mode inductor (9), the first end of the output side of the electromagnetic interference filter (16) is connected with the live wire end of the primary coil of the first transformer (301), and the second end of the output side of the electromagnetic interference filter (16) is connected with the neutral wire end of the primary coil of the first transformer (301). A first end of the first common mode capacitor (13) is connected with a first end of the input side of the electromagnetic interference filter (16), and a second end of the first common mode capacitor (13) is connected with a second end of the input side of the electromagnetic interference filter (16). A first end of the second common mode capacitor (14) is connected with a first end of the input side of the electromagnetic interference filter (16), and a second end of the second common mode capacitor (14) is connected with the ground wire. A first end of the third common-mode capacitor (15) is connected with a second end of the input side of the electromagnetic interference filter (16), and a second end of the third common-mode capacitor (15) is connected with the ground wire. The first end of the fourth common-mode capacitor (17) is connected with the first end of the output side of the electromagnetic interference filter (16), and the second end of the fourth common-mode capacitor (17) is connected with the second end of the output side of the electromagnetic interference filter (16). The first end of the fifth common-mode capacitor (18) is connected with the first end of the output side of the electromagnetic interference filter (16), and the second end of the fifth common-mode capacitor (18) is connected with the ground wire. The first end of the sixth common mode capacitor (19) is connected with the second end of the output side of the electromagnetic interference filter (16), and the second end of the sixth common mode capacitor (19) is connected with the ground wire.
In one embodiment, as shown in fig. 4, the switch sub-circuit (201) includes a relay contact (22) and a time delay resistor (23).
The first end of the delay resistor (23) is connected with the high-voltage side of the output end of the first rectifier bridge (303), and the first end of the delay resistor (23) is connected with the high-voltage side of the power supply input end of the main circuit (304). The relay contact (22) is connected in parallel with the delay resistor (23).
In the embodiment, the control sub-circuit (202) comprises a second transformer (25), a second rectifier bridge (26), a timing sub-circuit (37), a relay coil (31), a voltage-stabilizing sub-circuit (38) and a triode amplifier (30).
The live wire end of a primary coil of a second transformer (25) is connected with the second end of a main switch (302) in the alternating current-direct current conversion circuit, and the zero line end of the primary coil of the second transformer (25) is connected with the zero line end of a secondary coil of the first transformer (301). The input end of the second rectifier bridge (26) is connected in parallel with the secondary winding of the second transformer (25). The input end of the voltage-stabilizing subcircuit (38) is connected with the high-voltage side of the output end of the second rectifying bridge (26), the grounding end of the voltage-stabilizing subcircuit (38) is connected with the low-voltage side of the output end of the second rectifying bridge (26), and the output end of the voltage-stabilizing subcircuit (38) is connected with the input end of the timing subcircuit (37). The grounding end of the timing sub-circuit (37) is connected with the low-voltage side of the output end of the second rectifier bridge (26), and the output end of the timing sub-circuit (37) is connected with the control end of the triode amplifier (30). The emitter of the triode amplifier (30) is connected with the low-voltage side of the output end of the second rectifier bridge, and the collector of the triode amplifier (30) is connected with the first end of the relay coil (31). The second end of the relay coil (31) is connected with the output end of the voltage stabilizing sub-circuit (38).
In this embodiment, the buffer sub-circuit (203) is a buffer capacitor (23).
In one embodiment, as shown in FIG. 4, the AC immunity circuit (102) is a fourth bi-directional diode (20). The direct current anti-jamming circuit (103) is a one-way diode, the anode of the one-way diode (21) is connected with the low-voltage side of the main circuit power input end, and the cathode of the one-way diode (21) is connected with the high-voltage side of the main circuit power input end.
In the embodiment, the voltage-stabilizing sub-circuit (38) comprises a first filter capacitor (27), a second filter capacitor (29) and a three-terminal regulator (28). The input end, namely VIN end, of the three-terminal voltage regulator (28) is connected with the high-voltage side of the output end of the second rectifier bridge (26); the ground end, namely the GND end, of the three-terminal voltage regulator (28) is connected with the low-voltage side of the output end of the second rectifier bridge (26); the output end of the three-terminal voltage stabilizer (28), namely a VCC end, is connected with the input end of the timing sub-circuit (37). The first end of the first filter capacitor (27) is connected with the input end of the three-terminal voltage regulator (28), and the second end of the first filter capacitor (27) is connected with the low-voltage side of the output end of the second rectifier bridge (26). The first end of the second filter capacitor (29) is connected with the output end of the three-terminal voltage regulator (28), and the second end of the second filter capacitor (29) is connected with the low-voltage side of the output end of the second rectifier bridge (26).
In this embodiment, the 7812 type integrated regulator is used as the three-terminal regulator (28), and the three-terminal regulator (28) has an input voltage of 15V and an output voltage of 12V, so as to ensure that the integrated regulator tube works in a linear region. The capacitance value of the first filter capacitor (27) is 0.33 muF, and the capacitance value of the second filter capacitor (29) is 0.1 muF. The first filter capacitor (27) is used for counteracting the inductance effect of the circuit and preventing self-oscillation, and the second filter capacitor (29) is used for filtering high-frequency signals at the output end and improving the transient response of the circuit.
The timing sub-circuit (37) is a time-base timing circuit formed by a 555 timer, and the time-base timing circuit comprises a 555 timer (33), a first timing resistor (32), a second timing resistor (35), a first timing capacitor (34) and a second timing capacitor (36). The time base timing circuit adjusts the timing time by changing the specific values of the second timing resistor (35) and the second timing capacitor (36).
In this embodiment, the first timing capacitor (34) has a capacitance of 0.01 μ F, and the capacitor is grounded to prevent interference.
In this embodiment, the working principle of the power protection circuit of the ac-dc conversion circuit is as follows:
when external lightning surge impact is transmitted from a live wire and a zero line of the power supply, if the impact current of the external lightning surge impact is too large, the fuse (1) is fused, the power supply is cut off, and the main circuit is protected. When no overvoltage exists, the first gas discharge tube (3) is in an open state, and the first piezoresistor (2) is isolated from the system, so that leakage current hardly exists in the first piezoresistor (2), and the performance decline of the first piezoresistor (2) is effectively slowed down. When the surge impact of external lightning strikes has overvoltage, the first gas discharge tube (3) is broken down and conducted, the resistance value of the first piezoresistor (2) is reduced, the overvoltage is limited to a low level, and meanwhile, the overcurrent is increased; the current is discharged through a path formed by the first varistor (2) and the first gas discharge tube (3).
Similarly, when no overvoltage exists, the second gas discharge tube (6) is in an open state, the second piezoresistor (4) and the third piezoresistor (5) are isolated from the system, so that almost no leakage current exists in the second piezoresistor (4) and the third piezoresistor (5), and the performance degradation of the second piezoresistor (4) and the third piezoresistor (5) is effectively reduced. When the surge impact of external lightning strikes has overvoltage, the second gas discharge tube (6) is broken down and conducted, the resistance values of the second piezoresistor (4) and the third piezoresistor (5) are reduced, the overvoltage is limited to a low level, and meanwhile, the overcurrent is increased; the current is discharged through a path formed by the second piezoresistor (4) and the second gas discharge tube (6), and the third piezoresistor (5) and the second gas discharge tube (6). Effectively filter out overvoltage and protect the main circuit from being attacked. Meanwhile, the combination of the piezoresistor and the gas discharge tube effectively slows down the performance decline of the piezoresistor and improves the reliability of the whole power supply protection circuit.
And the differential mode protection sub-circuit (1013) filters the differential mode noise in the external lightning surge impact. The clamp subcircuit (1014) further clamps the voltage peaks to prevent overvoltage from entering the main circuit. And the common mode protection sub-circuit (1015) filters out common mode noise in external lightning surge impact. The alternating current anti-interference circuit (102) further performs anti-interference processing on the alternating current after voltage conversion of the first transformer (301) to filter high-frequency noise. The direct current anti-jamming circuit (103) further performs anti-jamming processing on the direct current rectified by the first rectifying bridge (303).
When the alternating current-direct current conversion circuit needs to be powered on, the main switch (302) is closed, through a first rectifier bridge (303) of the alternating current-direct current conversion circuit, input voltage charges the buffer capacitor (23) through the delay resistor (23), meanwhile, a second timing capacitor (36) of the auxiliary 555 timing time base circuit starts to be charged through a second timing resistor (35) by a voltage stabilizing power supply VCC output by the integrated voltage stabilizer 7812, after timing time limit, the output end of the 555 timer outputs high level, the triode amplifier (30) is conducted, the relay coil (31) is powered on, and the relay contact (22) is controlled to act in a feedback mode. The relay is connected in a delayed manner, so that the effect of instantaneous impact current prevention is achieved. A current amplifier is inserted into the control sub-circuit (202), and the output current of the amplifier is increased, so that the relay action is effectively ensured to be crisp and reliable, and the surge current at the moment of electrifying is effectively released. When the main switch (302) is turned off, the fully charged buffer capacitor (23) and the post-stage circuit form a discharge loop to realize buffer release of power-off.
The power protection circuit of alternating current-direct current converting circuit that this application embodiment provided, no matter be to external thunderbolt surge, or inside power-on surge in the twinkling of an eye, the homoenergetic filters, guarantees that alternating current-direct current converting circuit's main circuit is not disturbed, has strengthened the interference immunity of circuit, further guarantees alternating current-direct current converting circuit's system safety. Meanwhile, the internal impact protection circuit can achieve the effect of power-off buffering, the problems that the main circuit data is lost due to sudden power failure and the like are solved, and the safety and the reliability of the circuit are further improved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power supply protection circuit of an alternating current-direct current conversion circuit is characterized by comprising an external impact protection circuit and an internal impact protection circuit, wherein the external impact protection circuit comprises an alternating current protection circuit (101), an alternating current anti-interference circuit (102) and a direct current anti-interference circuit (103), and the internal impact protection circuit comprises a switch sub-circuit (201), a control sub-circuit (202) and a buffer sub-circuit (203);
the alternating current protection circuit (101) is connected in parallel with a primary coil of a first transformer (301) in the alternating current-direct current conversion circuit;
the alternating current anti-jamming circuit (102) is connected with a secondary side coil of the first transformer (301) in the alternating current-direct current conversion circuit in parallel;
the direct-current anti-interference circuit (103) is connected with a power supply input end of a main circuit (304) in the alternating-current and direct-current conversion circuit in parallel;
the first end of the switch sub-circuit (201) is connected with the high-voltage side of the output end of a first rectifier bridge (303) in the alternating current-direct current conversion circuit, and the second end of the switch sub-circuit (201) is connected with the high-voltage side of the power supply input end of the main circuit (304);
the control sub-circuit (202) is connected in parallel with the input end of the first rectifier bridge (303);
the buffer sub-circuit (203) is connected in parallel with the power supply input end of the main circuit (304).
2. The power protection circuit of AC-DC conversion circuit according to claim 1, wherein said AC protection circuit (101) comprises an overcurrent protection sub-circuit (1011), an overvoltage protection sub-circuit (1012), a differential mode protection sub-circuit (1013), a clamp sub-circuit (1014) and a common mode protection sub-circuit (1015);
the over-current protection sub-circuit (1011) is connected in series with a power supply live wire;
the first end of the overvoltage protection sub-circuit (1012) is connected with the power supply live wire which is connected with the overcurrent protection sub-circuit (1011) in series, and the second end of the overvoltage protection sub-circuit (1012) is connected with the power supply zero wire;
the first end of the input side of the differential mode protection sub-circuit (1013) is connected with the first end of the overvoltage protection sub-circuit (1012), and the second end of the input side of the differential mode protection sub-circuit (1013) is connected with the second end of the overvoltage protection sub-circuit (1012);
a first end of the clamping subcircuit (1014) is connected with a first end of the output side of the differential mode protection subcircuit (1013), and a second end of the clamping subcircuit (1014) is connected with a second end of the output side of the differential mode protection subcircuit (1013);
the first end of the input side of the common mode protection sub-circuit (1015) is connected with the first end of the clamping sub-circuit (1014), the second end of the input side of the common mode protection sub-circuit (1015) is connected with the second end of the clamping sub-circuit (1014), the first end of the output side of the common mode protection sub-circuit (1015) is connected with a fire wire end of a primary side coil of the first transformer (301), and the second end of the output side of the common mode protection sub-circuit (1015) is connected with a zero wire end of the primary side coil of the first transformer (301).
3. The power protection circuit of AC-DC conversion circuit according to claim 2, wherein said over-current protection sub-circuit (1011) is a fuse (1).
4. The power protection circuit of AC-DC conversion circuit according to claim 3, wherein said overvoltage protection subcircuit (1012) comprises a first voltage dependent resistor (2), a second voltage dependent resistor (4), a third voltage dependent resistor (5), a first gas discharge tube (3) and a second gas discharge tube (6);
the first end of the first piezoresistor (2) is connected with the power supply live wire after the fuse (1) is connected in series, and the second end of the first piezoresistor (2) is connected with the first end of the first gas discharge tube (3);
the second end of the first gas discharge tube (3) is connected with a power supply zero line;
the first end of the second piezoresistor (4) is connected with the power supply zero line, and the second end of the second piezoresistor (4) is connected with the first end of the second gas discharge tube (6);
the first end of the third piezoresistor (5) is connected with the live power wire, and the second end of the third piezoresistor (5) is connected with the first end of the second gas discharge tube (6);
the second end of the second gas discharge tube (6) is connected with the ground wire.
5. The power protection circuit of AC-DC conversion circuit according to claim 4, wherein said differential mode protection subcircuit (1013) comprises a first differential mode inductor (8), a second differential mode inductor (9), a first differential mode capacitor (7) and a second differential mode capacitor (10);
the first differential mode inductor (8) is connected in series with the power live wire, and the second differential mode inductor (9) is connected in series with the power zero wire;
a first end of the first differential mode capacitor (7) is connected with a first end of the first differential mode inductor (8), and a second end of the first differential mode capacitor (7) is connected with a first end of the second differential mode inductor (9);
the first end of the second differential mode capacitor (10) is connected to the second end of the first differential mode inductor (8), and the second end of the second differential mode capacitor (10) is connected to the second end of the second differential mode inductor (9).
6. The power protection circuit of AC-DC conversion circuit according to claim 5, wherein said clamping sub-circuit (1014) comprises a first bi-directional diode (13), a second bi-directional diode (11) and a third bi-directional diode (12);
a first end of the first bidirectional diode (13) is connected with a second end of the first differential-mode inductor (8), and a second end of the first bidirectional diode (13) is connected with a second end of the second differential-mode inductor (9);
a first end of the second bidirectional diode (11) is connected with a second end of the second differential-mode inductor (9), and a second end of the second bidirectional diode (11) is connected with the ground wire;
the first end of the third bidirectional diode (12) is connected with the second end of the first differential-mode inductor (8), and the second end of the third bidirectional diode (12) is connected with the ground wire.
7. The power protection circuit of AC-DC conversion circuit according to claim 6, wherein said common mode protection sub-circuit (1015) comprises an electromagnetic interference filter (16), a first common mode capacitor, a second common mode capacitor (15), a third common mode capacitor (14), a fourth common mode capacitor (19), a fifth common mode capacitor (17) and a sixth common mode capacitor (18);
the first end of the input side of the electromagnetic interference filter (16) is connected with the second end of the first differential mode inductor (8), the second end of the input side of the electromagnetic interference filter (16) is connected with the second end of the second differential mode inductor (9), the first end of the output side of the electromagnetic interference filter (16) is connected with the fire end of the primary coil of the first transformer (301), and the second end of the output side of the electromagnetic interference filter (16) is connected with the zero end of the primary coil of the first transformer (301);
the first end of the first common-mode capacitor is connected with the first end of the input side of the electromagnetic interference filter (16), and the second end of the first common-mode capacitor is connected with the second end of the input side of the electromagnetic interference filter (16);
a first end of the second common-mode capacitor (15) is connected with a first end of the input side of the electromagnetic interference filter (16), and a second end of the second common-mode capacitor (15) is connected with the ground wire;
a first end of the third common mode capacitor (14) is connected with a second end of the input side of the electromagnetic interference filter (16), and a second end of the third common mode capacitor (14) is connected with the ground wire;
a first end of the fourth common-mode capacitor (19) is connected with a first end of the output side of the electromagnetic interference filter (16), and a second end of the fourth common-mode capacitor (19) is connected with a second end of the output side of the electromagnetic interference filter (16);
a first end of the fifth common-mode capacitor (17) is connected with a first end of the output side of the electromagnetic interference filter (16), and a second end of the fifth common-mode capacitor (17) is connected with the ground wire;
the first end of the sixth common mode capacitor (18) is connected with the second end of the output side of the electromagnetic interference filter (16), and the second end of the sixth common mode capacitor (18) is connected with the ground wire.
8. The power protection circuit of AC-DC conversion circuit according to claim 1, wherein said switch sub-circuit (201) comprises relay contacts (22) and a delay resistor (23);
the first end of the delay resistor (23) is connected with the high-voltage side of the output end of the first rectifier bridge (303), and the second end of the delay resistor (23) is connected with the high-voltage side of the power supply input end of the main circuit (304);
the relay contact (22) is connected in parallel with the delay resistor (23).
9. The power protection circuit of AC-DC conversion circuit according to claim 8, wherein said control sub-circuit (202) comprises a second transformer (25), a second rectifier bridge (26), a timer sub-circuit (37), a relay coil (31), a regulator sub-circuit (38) and a triode amplifier (30);
the fire wire end of the primary coil of the second transformer (25) is connected with the second end of a main switch (302) in the alternating current-direct current conversion circuit, and the zero line end of the primary coil of the second transformer (25) is connected with the zero line end of the secondary coil of the first transformer (301);
the input end of the second rectifier bridge (26) is connected with the secondary coil of the second transformer (25) in parallel;
the input end of the voltage-stabilizing sub-circuit (38) is connected with the high-voltage side of the output end of the second rectifier bridge (26), the ground end of the voltage-stabilizing sub-circuit (38) is connected with the low-voltage side of the output end of the second rectifier bridge (26), and the output end of the voltage-stabilizing sub-circuit (38) is connected with the input end of the timer sub-circuit (37);
the grounding end of the timing sub-circuit (37) is connected with the low-voltage side of the output end of the second rectifier bridge (26), and the output end of the timing sub-circuit (37) is connected with the control end of the triode amplifier (30);
the emitter of the triode amplifier (30) is connected with the low-voltage side of the output end of the second rectifier bridge, and the collector of the triode amplifier (30) is connected with the first end of the relay coil (31);
and the second end of the relay coil (31) is connected with the output end of the voltage-stabilizing sub-circuit (38).
10. The power protection circuit of AC-DC conversion circuit according to claim 8, wherein said buffer sub-circuit (203) is a buffer capacitor (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021939710.8U CN213027432U (en) | 2020-09-07 | 2020-09-07 | Power protection circuit of alternating current-direct current conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021939710.8U CN213027432U (en) | 2020-09-07 | 2020-09-07 | Power protection circuit of alternating current-direct current conversion circuit |
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| CN213027432U true CN213027432U (en) | 2021-04-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
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