CN115603284A - Butt joint input power supply protection circuit - Google Patents
Butt joint input power supply protection circuit Download PDFInfo
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- CN115603284A CN115603284A CN202110773910.3A CN202110773910A CN115603284A CN 115603284 A CN115603284 A CN 115603284A CN 202110773910 A CN202110773910 A CN 202110773910A CN 115603284 A CN115603284 A CN 115603284A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
Abstract
The invention discloses a butt joint input power supply protection circuit. The butt joint input power protection circuit includes: the device comprises a positive input end, a negative input end, an output end, a switch module and a surge protection module; the switch module is connected between the positive input end and the output end; the negative input end is grounded; the switch module is used for switching on or switching off the power supply output; the first end of the surge protection module is connected with the positive input end, and the second end of the surge protection module is connected with the control end of the switch module; the surge protection module is used for switching off the switch module when the input voltage exceeds a threshold voltage. The invention provides a butt-joint input power supply protection circuit which can improve the protection level of high-voltage input of an input power supply circuit and avoid the power supply from being reversely connected and surge high voltage from damaging the power supply circuit.
Description
Technical Field
The embodiment of the invention relates to a power supply protection technology, in particular to a butt-joint input power supply protection circuit.
Background
With the increasing requirement of electronic equipment on the reliability of electronic systems or circuit boards, higher requirements are also put on the power supply safety of power supplies. The high-voltage protection of the existing butt joint input power supply still has some defects, and the problem of insufficient protection of the power supply circuit still exists in the butt joint input power supply circuit in the market with lower protection level.
Disclosure of Invention
The invention provides a butt-joint input power supply protection circuit which can improve the protection level of high-voltage input of an input power supply circuit and avoid the power supply from being reversely connected and surge high voltage from damaging the power supply circuit.
The embodiment of the invention provides a butt joint input power supply protection circuit, which comprises: the device comprises a positive input end, a negative input end, an output end, a switch module and a surge protection module;
the switch module is connected between the positive input end and the output end; the negative input end is grounded; the switch module is used for switching on or switching off the power supply output; the power supply end of the switch enabling unit is electrically connected with the positive input end, and the enabling output end of the switch enabling unit is electrically connected with the control end of the switch module; the switch enabling unit is used for providing a conducting signal of the switch module according to a power supply input signal;
the first end of the surge protection module is connected with the positive electrode input end, and the second end of the surge protection module is connected with the control end of the switch module; the surge protection module is used for switching off the switch module when the input voltage exceeds a threshold voltage.
Optionally, the surge protection module includes a voltage stabilizing unit, a switching tube, a first switching transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor;
the first resistor is electrically connected between the input end of the voltage stabilizing unit and the positive electrode input end, the output end of the voltage stabilizing unit is electrically connected with the first electrode of the switch tube, and the voltage stabilizing unit is used for outputting a switch signal when the input voltage exceeds a stabilized voltage value; the second resistor is electrically connected between the first pole of the switching tube and the second pole of the switching tube, the second pole of the switching tube is grounded, the third resistor is electrically connected between the third pole of the switching tube and the first pole of the first switching transistor, and the switching tube is used for conducting a loop according to a switching signal; the second pole of the first switching transistor is grounded, and the fourth resistor is electrically connected between the third pole of the first switching transistor and the control end of the switch module.
Optionally, the surge protection module further includes a reset circuit, where the reset circuit includes a fifth resistor, a sixth resistor, a seventh resistor, a reset control unit, a first capacitor, and a second capacitor;
the reset end of the reset control unit is electrically connected with the third pole of the switch tube, the first end of the seventh resistor and the second end of the sixth resistor; the grounding end of the reset control unit is electrically connected with the second end of the seventh resistor and the grounding end; the output end of the reset control unit is electrically connected with the first end of the sixth resistor, the first end of the fifth resistor and the first pole of the first capacitor, and the second pole of the first capacitor is grounded; and a power supply end of the reset control unit is electrically connected with a second end of the fifth resistor and a first pole of the second capacitor, and a second pole of the second capacitor is grounded.
Optionally, the switch module includes a second switch transistor and a third switch transistor;
the first pole of the second switch transistor is connected with the positive input end, the second pole of the second switch transistor is electrically connected with the second pole of the third switch transistor, the first pole of the third switch transistor is electrically connected with the output end, and the third pole of the third switch transistor is electrically connected with the third pole of the second switch transistor and serves as the control end of the switch module.
Optionally, the butt-joint input power protection circuit further includes an overcurrent protection module, the overcurrent protection module is electrically connected between the positive input end and the switch module, and the overcurrent protection module is configured to cut off the current loop when overcurrent is input to the positive input end.
Optionally, the overcurrent protection module includes a fuse, a first end of the fuse is electrically connected to the positive input end, a second end of the fuse is electrically connected to the switch module, and the fuse fuses a cut-off current of the circuit when the fuse is used for overcurrent.
Optionally, the butt joint input power supply protection circuit further comprises a hot plug protection module, a first end of the hot plug protection module is connected with the overcurrent protection module, a second end of the hot plug protection module is grounded, and the hot plug protection module is used for grounding transient overcurrent and overvoltage during hot plug operation.
Optionally, the hot plug protection module includes a bidirectional transient suppression diode; the first end of the bidirectional transient suppression diode is used as the first end of the hot plug protection module to be electrically connected with the overcurrent protection module, and the second end of the bidirectional transient suppression diode is grounded.
Optionally, the protection circuit for the input power further includes: the first end of the filtering module is connected with the first end of the hot plug protection module, and the second end of the filtering module is grounded; the first end of the filtering module is connected with the input end of the switch module; the filtering module is used for filtering the input power supply signal.
Optionally, the filtering module includes: the first capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the first current limiting resistor and the second current limiting resistor;
the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are respectively connected in parallel with the hot plug protection module; the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are used for filtering an input power supply signal; the first end of the hot plug protection module is electrically connected with the first pole of the fourth capacitor, and the second end of the second current-limiting resistor is electrically connected between the second end of the hot plug protection module and the second pole of the fourth capacitor; the first current limiting resistor and the second current limiting resistor are used for limiting loop current.
According to the technical scheme provided by the embodiment of the invention, when the voltage input of the power supply is reversely connected, the switch enabling unit stops the output of the driving signal, and the switch module stops the output of the power supply so as to provide power supply reverse connection protection. When the input of the power supply voltage is overvoltage, namely the input voltage is greater than the threshold voltage of the surge protection module, the surge protection module outputs a turn-off signal to the switch module, and the switch module is used for stopping the output of the power supply, so that the protection level of the input power supply circuit during high-voltage input can be improved, and the power supply is prevented from being reversely connected and surging the high voltage to damage the power supply circuit.
Drawings
Fig. 1 is a schematic structural diagram of a protection circuit for an input power supply according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another protection circuit for an input power supply according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another protection circuit for an input power supply according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of another protection circuit for an input power supply according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of another protection circuit for an input power supply according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of another protection circuit for an input power supply according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of another protection circuit for an input power source according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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. 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 invention.
Fig. 1 is a schematic structural diagram of a protection circuit for a butt-joint input power supply according to an embodiment of the present invention, referring to fig. 1, the protection circuit for a butt-joint input power supply according to the embodiment of the present invention includes a positive input terminal 110, a negative input terminal 120, an output terminal 130, a switch module 140, a surge protection module 150, and a switch enabling unit 160;
a switch module 140 is connected between the positive input end 110 and the output end 130; the negative input 120 is grounded; the switch module 130 is used for switching on or off the power supply output; the power end of the switch enabling unit 160 is electrically connected to the positive input end 110, and the enabling output end of the switch enabling unit 160 is electrically connected to the control end of the switch module 140; the switch enabling unit 160 is configured to provide a conducting signal of the switch module 140 according to the power input signal;
a first end of the surge protection module 150 is connected with the positive input end 110, and a second end of the surge protection module 150 is connected with the control end of the switch module 140; the surge protection module 150 is configured to turn off the switching module when the input voltage exceeds a threshold voltage.
Specifically, when the positive input terminal 110 inputs a voltage normally, the switch enabling unit 160 may output an AC-GP driving signal normally, and the driving signal drives the switch module 140 to be turned on. At this time, the switch module 140 is in an on state, and the threshold voltage of the surge protection module 150 is greater than the input voltage, so that the surge protection module 150 is in an off state, and the input voltage can be input to the subsequent circuit through the output terminal 130 after passing through the switch module 140. The operating state of the switch enabling unit 160 is related to the input voltage of the circuit, when the input voltage is normally connected, the switch enabling unit normally outputs an AC-GP driving signal, the driving signal drives the switch module 140, when the input voltage is reversely connected, that is, the positive input end is grounded, the negative input end is connected to the power supply, the switch enabling unit 160 cannot normally operate, the output of the AC-GP driving signal is cut off, and thus the switch module is cut off. Therefore, the voltage output is cut off, so that the voltage output is cut off when the power supply input is reversely connected, and the reverse connection protection of the power supply is provided.
When surge voltage, i.e., instantaneous high voltage, is input to the positive input terminal 110, and the input high voltage is greater than the threshold voltage value of the surge protection module 150 at this time, the surge protection module 150 outputs a turn-off signal to the control terminal of the switch module 140, and the switch module 140 is turned to a cut-off state according to the turn-off signal, so that voltage output is cut off, and a rear-stage circuit connected to the output terminal 130 is protected.
According to the technical scheme provided by the embodiment of the invention, when the voltage input of the power supply is reversely connected, the switch enabling unit stops the output of the driving signal, and the switch module stops the output of the power supply so as to provide power supply reverse connection protection. When the input of the power supply voltage is overvoltage, namely the input voltage is greater than the threshold voltage of the surge protection module, the surge protection module outputs a turn-off signal to the switch module, and the switch module is used for stopping the output of the power supply, so that the protection level of the input power supply circuit during high-voltage input can be improved, and the power supply is prevented from being reversely connected and surging the high voltage to damage the power supply circuit. .
As an optional implementation manner provided in the embodiment of the present invention, the embodiment of the present invention provides a specific structure of a protection circuit for an input power source. Fig. 2 is a schematic structural diagram of another protection circuit for an input power source, which is provided in an embodiment of the present invention, and specifically shows a specific circuit structure of a surge protection module, and based on the foregoing technical solution, referring to fig. 2, the surge protection module 150 includes a voltage regulation unit 210, a switching tube D2, a first switching transistor PQ1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
a first resistor R1 is electrically connected between the input end of the voltage stabilizing unit 210 and the positive input end 110, the output end of the voltage stabilizing unit 210 is electrically connected to the first pole of the switching tube D2, and the voltage stabilizing unit 210 is configured to output a switching signal when the input voltage exceeds a voltage stabilizing value; a second resistor R2 is electrically connected between the first pole of the switch tube D2 and the second pole of the switch tube D2, the second pole of the switch tube D2 is grounded, a third resistor R3 is electrically connected between the third pole of the switch tube D2 and the first pole of the first switch transistor PQ1, and the switch tube D2 is used for turning on a loop according to a switching signal; a second pole of first switching transistor PQ1 is grounded, and a fourth resistor R4 is electrically connected between a third pole of first switching transistor PQ1 and the control terminal of switching module 140.
Specifically, when the positive input terminal 110 inputs a voltage normally, the switch enabling unit 160 may output an AC-GP driving signal normally, and the driving signal drives the switch module 140 to be turned on. At this time, the switch module 140 is in a conducting state, the threshold voltage of the voltage stabilizing unit 210 is greater than the input voltage, the voltage stabilizing unit 210 is in a blocking state, and the input voltage can be input to the subsequent circuit through the output terminal 130 after passing through the switch module 140. Illustratively, the voltage regulation unit 210 may employ a schottky diode D1, and the schottky diode D1 is connected in reverse to provide a turn-on threshold voltage. Taking the example that the switching tube D2 is an N-type triode, the third pole of the switching tube D2 is connected to the power signal Vin, when the input voltage exceeds the breakdown voltage of the schottky diode D1, the schottky diode D1 is in the on state, the first pole of the switching tube D2, i.e., the base stage, receives the high potential signal, the switching tube D2 is turned on, the first pole of the first switching transistor PQ1, i.e., the gate electrode, is grounded at this time, taking the first switching transistor as a P-channel as an example, the first switching transistor PQ1 is turned on at this time, the control end of the switching module 140 is grounded and then turned off, so that the voltage output is turned off, and therefore, when the surge overvoltage is input, the voltage output can be turned off, and the rear stage circuit is protected. The first resistor R1, the third resistor R3 and the fourth resistor R4 in the circuit play a role in current limiting protection, and the second resistor R2 is a bias resistor.
Fig. 3 is a schematic structural diagram of another protection circuit for a butt-joint input power supply according to an embodiment of the present invention, specifically showing another specific circuit structure of a surge protection module, and based on the above technical solution, referring to fig. 3, the surge protection module further includes a reset circuit 320, where the reset circuit 320 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a reset control unit 310, a first capacitor C1, and a second capacitor C2;
a reset terminal REREST of the reset control unit 310 is electrically connected with a third pole of the switching tube D2, a first terminal of a seventh resistor R7 and a second terminal of a sixth resistor R6; a ground terminal GND of the reset control unit 310 is electrically connected with a second terminal and a ground terminal of the seventh resistor R7; an output end MN of the reset control unit 310 is electrically connected to a first end of a sixth resistor R6, a first end of a fifth resistor R5, and a first pole of a first capacitor C1, and a second pole of the first capacitor C1 is grounded; the power source terminal VCC of the reset control unit 310 is electrically connected to the second terminal of the fifth resistor R5 and the first terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is grounded.
Specifically, when the reset port REREST of the reset control unit 310 receives a low potential signal, the reset control unit 310 sends a reset signal to the subsequent circuit, and the subsequent circuit may perform a reset restart operation. For example, the reset control unit may adopt a G692L293TCUF type reset chip. The specific working process of the circuit is as follows: when the voltage is normally input, the switch enabling unit 160 may normally output the AC-GP driving signal, which drives the switching module 140 to be turned on. At this time, the switching module 140 is in a conducting state, the input voltage is less than the threshold voltage of the schottky diode D1, and the schottky diode D1 is in a blocking state. Therefore, the input voltage can be input to the subsequent circuit through the output terminal 130 after passing through the switch module 140. When the input voltage exceeds the breakdown voltage of the schottky diode D1, the schottky diode D1 is in a conducting state, the first pole, i.e., the base stage, of the switching tube D2 receives the high potential signal, the switching tube D2 is conducting, at this time, the reset terminal REREST of the reset control unit 310 is grounded, the reset control unit 310 sends a reset signal, and the rear-stage circuit can perform reset operation according to the reset signal. At this time, the first electrode of first switching transistor PQ1, i.e., the gate electrode, is grounded, and taking first switching transistor PQ1 as the P-channel as an example, first switching transistor PQ1 is turned on, and the control terminal of switching module 140 is grounded and then turned off, thereby turning off the voltage output. Therefore, when surge overvoltage is input, cut-off voltage output can be realized, and the rear-stage circuit is reset and protected. The power source terminal VCC of the reset control unit 310 is connected to the power signal Vin, which supplies power to the reset control unit 310, and when the switching transistor D2 is turned off, the first electrode of the first switching transistor PQ1 is at a high potential, so that the first switching transistor PQ1 is kept in an off state. The fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 respectively provide current-limiting protection, and the first capacitor C1 and the second capacitor C2 respectively perform signal filtering processing.
Fig. 4 is a schematic structural diagram of another protection circuit for a power supply with an input interface according to an embodiment of the present invention, and based on the above embodiment, referring to fig. 4, a switch module 140 includes a second switch transistor PQ2 and a third switch transistor PQ3.
A first pole of second switching transistor PQ2 is connected to positive input terminal 110, a second pole of second switching transistor PQ2 is electrically connected to a second pole of third switching transistor PQ3, a first pole of third switching transistor PQ3 is electrically connected to output terminal 130, and a third pole of third switching transistor PQ3 is electrically connected to a third pole of second switching transistor PQ2 and serves as a control terminal of switching module 140.
Specifically, the second switching transistor PQ2 and the third switching transistor PQ3 can be turned on or off to output an electric signal based on a potential signal at the control terminal. For example, the second and third switching transistors PQ2 and PQ3 may be N-type transistors. A source of the second switching transistor PQ2 is connected to a source of the third switching transistor PQ3, a drain of the second switching transistor PQ2 serves as an input terminal of the switching module 140, and a drain of the third switching transistor PQ3 serves as an output terminal of the switching module 140. The second switching transistor PQ2 and the third switching transistor PQ3 form a bidirectional switch group, which can provide bidirectional turn-off protection. The switch enable unit 160 enables an output terminal to supply AC-GP driving signals for driving the second and third switching transistors PQ2 and PQ3 to be turned on to the gates of the second and third switching transistors PQ2 and PQ3. The operation state of the switch enabling unit 160 is related to the input voltage of the circuit, when the input voltage is normally connected, the switch enabling unit normally outputs an AC-GP driving signal, which drives the second switching transistor PQ2 and the third switching transistor PQ3 to be turned on, and when the input voltage is reversely connected, that is, the positive input terminal is grounded, and the negative input terminal is connected to the power supply, the switch enabling unit 160 cannot normally operate, and then the output AC-GP driving signal is turned off, so that the second switching transistor PQ2 and the third switching transistor PQ3 are turned off. Therefore, the voltage output is cut off, so that the voltage output is cut off when the power supply input is reversely connected, and the reverse connection protection of the power supply is provided.
Fig. 5 is a schematic structural diagram of another protection circuit for a butt-joint input power supply according to an embodiment of the present invention, referring to fig. 5, based on the above embodiment, the protection circuit for a butt-joint input power supply further includes an overcurrent protection module 510, the overcurrent protection module 510 is electrically connected between the positive input terminal 110 and the switch module 140, and the overcurrent protection module 510 is configured to cut off a current loop when an overcurrent is input to the positive input terminal.
Specifically, when a large current is input to the positive input terminal 110, the current is accumulated in the overcurrent protection module 510 for a certain time, and the overcurrent protection module 510 will cut off the current loop, i.e., power off process. Thereby protecting the rear-stage circuit from being damaged by large current.
With continued reference to fig. 5, the overcurrent protection module 510 includes a fuse P1, a first terminal of the fuse P1 is electrically connected to the positive input terminal 110, a second terminal of the fuse P1 is electrically connected to the switch module 140, and the fuse P1 is used for blowing the line to cut off current when overcurrent occurs.
Specifically, the overcurrent protection module 510 may adopt a fuse P1, and when the fuse P1 is cut off, normal use of the circuit may be recovered by replacing the fuse P1, so that maintenance is simple and convenient, and application cost of the device is low, which is beneficial to reducing hardware cost.
Fig. 6 is a schematic structural diagram of another protection circuit for an input power supply according to an embodiment of the present invention, referring to fig. 6, based on the above embodiment, the protection circuit for an input power supply further includes a hot plug protection module 610, a first end of the hot plug protection module 610 is connected to the overcurrent protection module 510, a second end of the hot plug protection module 610 is grounded, and the hot plug protection module 610 is configured to ground an instantaneous overcurrent and overvoltage during a hot plug operation.
Specifically, after the power is connected, the hot plug protection module 610 provides an ultra-low resistance path for the transient voltage due to an excessive transient voltage caused by a hot plug operation, and the transient voltage is led out to the ground through the hot plug protection module 610, so that a rear-stage circuit is avoided, and a protected loop is kept to be cut off until the voltage and current return to a normal value. When the voltage and current are recovered, the hot-plug protection module 610 maintains a high impedance state, and the input voltage is normally output to the post-stage circuit through the switch module.
With continued reference to fig. 6, the hot swap protection module 610 includes a bidirectional transient suppression diode TVS1; the first end of the bidirectional transient suppression diode TVS1 is electrically connected to the overcurrent protection module 510 as the first end of the hot swap protection module 610, and the second end of the bidirectional transient suppression diode TVS1 is grounded.
Specifically, the hot swap protection module 610 may employ a bidirectional transient suppressor TVS1, and after the power is turned on, a hot swap operation may generate a very high transient voltage, which may break down and damage some electrical components. When the bidirectional transient suppression diode TVS1 is subjected to an instantaneous high voltage surge, the bidirectional transient suppression diode TVS1 can change the impedance value between the two terminals from a high impedance to a low impedance at a very high speed to absorb an instantaneous large current, and the instantaneous voltage is led out to the ground through the bidirectional transient suppression diode TVS1, thereby protecting the following circuit elements from the surge of the instantaneous high voltage spike. After the voltage and current are recovered, the bidirectional transient suppression diode TVS1 maintains a high-resistance state, and the input voltage is normally output to the post-stage circuit through the switch module.
Fig. 7 is a schematic structural diagram of another protection circuit for an input power source according to an embodiment of the present invention, and based on the foregoing embodiment, referring to fig. 7, the protection circuit for an input power source further includes: a first end of the filtering module 710 is connected to a first end of the hot plug protection module 610, and a second end of the filtering module 710 is grounded; the first end of the filtering module 710 is connected to the input end of the switch module 140; the filtering module 710 is used for performing filtering processing on the input power signal.
Specifically, the filtering module 710 filters the power input signal, so as to reduce spike noise of the input signal, thereby making the signal output smoother.
With continued reference to fig. 7, the filtering module includes: a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first current limiting resistor R8 and a second current limiting resistor R9;
the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are respectively connected in parallel with the hot plug protection module 610; the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are used for filtering an input power supply signal; a first current-limiting resistor R8 is electrically connected between a first end of the hot plug protection module 610 and a first pole of the fourth capacitor C4, and a second end of a second current-limiting resistor R9 is electrically connected between a second end of the hot plug protection module 610 and a second pole of the fourth capacitor C4; the first current limiting resistor R8 and the second current limiting resistor R9 are used to limit the loop current.
Specifically, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are connected in parallel at the power input end as filter capacitors, so that the ac ripple factor can be reduced, the dc output of the power supply can be smooth and stable, the influence of the alternating pulsating current on the circuit can be reduced, and the current fluctuation generated in the working process of the electronic circuit and the interference of the series connection of the ac power supply can be absorbed, so that the working performance of the electronic circuit is more stable. The first current-limiting resistor and the second current-limiting resistor play a role in current-limiting protection, and the influence of over-current and over-voltage on a post-stage circuit is avoided.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A protection circuit for a power supply with a butt-joint input, comprising: the device comprises a positive input end, a negative input end, an output end, a switch module, a surge protection module and a switch enabling unit;
the switch module is connected between the positive input end and the output end; the negative input end is grounded; the switch module is used for switching on or switching off the power supply output; the power supply end of the switch enabling unit is electrically connected with the positive input end, and the enabling output end of the switch enabling unit is electrically connected with the control end of the switch module; the switch enabling unit is used for providing a conducting signal of the switch module according to a power supply input signal;
the first end of the surge protection module is connected with the positive electrode input end, and the second end of the surge protection module is connected with the control end of the switch module; the surge protection module is used for switching off the switch module when the input voltage exceeds a threshold voltage.
2. The protection circuit for the power supply of the butt joint input of the claim 1, characterized in that the surge protection module comprises a voltage stabilization unit, a switching tube, a first switching transistor, a first resistor, a second resistor, a third resistor and a fourth resistor;
the first resistor is electrically connected between the input end of the voltage stabilizing unit and the positive electrode input end, the output end of the voltage stabilizing unit is electrically connected with the first electrode of the switch tube, and the voltage stabilizing unit is used for outputting a switching signal when the input voltage exceeds a stabilized voltage value; the second resistor is electrically connected between the first pole of the switching tube and the second pole of the switching tube, the second pole of the switching tube is grounded, the third resistor is electrically connected between the third pole of the switching tube and the first pole of the first switching transistor, and the switching tube is used for conducting a loop according to a switching signal; the second pole of the first switching transistor is grounded, and the fourth resistor is electrically connected between the third pole of the first switching transistor and the control end of the switching module.
3. The protection circuit for the power supply of the butt joint input of claim 2, wherein the surge protection module further comprises a reset circuit, and the reset circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a reset control unit, a first capacitor and a second capacitor;
the reset end of the reset control unit is electrically connected with the third pole of the switch tube, the first end of the seventh resistor and the second end of the sixth resistor; the grounding end of the reset control unit is electrically connected with the second end of the seventh resistor and the grounding end; the output end of the reset control unit is electrically connected with the first end of the sixth resistor, the first end of the fifth resistor and the first pole of the first capacitor, and the second pole of the first capacitor is grounded; and a power supply end of the reset control unit is electrically connected with a second end of the fifth resistor and a first pole of the second capacitor, and a second pole of the second capacitor is grounded.
4. The dock input power protection circuit of claim 1, wherein the switch module comprises a second switch transistor and a third switch transistor;
the first pole of the second switch transistor is connected with the positive input end, the second pole of the second switch transistor is electrically connected with the second pole of the third switch transistor, the first pole of the third switch transistor is electrically connected with the output end, and the third pole of the third switch transistor is electrically connected with the third pole of the second switch transistor and serves as the control end of the switch module.
5. The protection circuit for the power supply with the butt joint input according to claim 1, further comprising an overcurrent protection module, wherein the overcurrent protection module is electrically connected between the positive input end and the switch module, and the overcurrent protection module is used for cutting off a current loop when overcurrent is input to the positive input end.
6. A butt input power protection circuit as claimed in claim 5,
the overcurrent protection module comprises a fuse, a first end of the fuse is electrically connected with the positive electrode input end, a second end of the fuse is electrically connected with the switch module, and the fuse fuses a circuit cutoff current when used for overcurrent.
7. The protection circuit for the power supply with the input power supply as claimed in claim 5, further comprising a hot plug protection module, wherein a first end of the hot plug protection module is connected to the over-current protection module, a second end of the hot plug protection module is grounded, and the hot plug protection module is configured to ground the transient over-current over-voltage during a hot plug operation.
8. The dock input power protection circuit of claim 7, wherein the hot swap protection module comprises a bidirectional transient suppression diode; the first end of the bidirectional transient suppression diode is used as the first end of the hot plug protection module and is electrically connected with the overcurrent protection module, and the second end of the bidirectional transient suppression diode is grounded.
9. The dock input power protection circuit of claim 7, further comprising: the first end of the filtering module is connected with the first end of the hot plug protection module, and the second end of the filtering module is grounded; the first end of the filtering module is connected with the input end of the switch module; the filtering module is used for filtering the input power supply signal.
10. The dock input power protection circuit of claim 9, wherein the filtering module comprises: the first capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the first current limiting resistor and the second current limiting resistor;
the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are respectively connected with the hot plug protection module in parallel; the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are used for filtering an input power supply signal; the first end of the hot plug protection module is electrically connected with the first pole of the fourth capacitor, and the second end of the second current-limiting resistor is electrically connected between the second end of the hot plug protection module and the second pole of the fourth capacitor; the first current limiting resistor and the second current limiting resistor are used for limiting loop current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110773910.3A CN115603284A (en) | 2021-07-08 | 2021-07-08 | Butt joint input power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110773910.3A CN115603284A (en) | 2021-07-08 | 2021-07-08 | Butt joint input power supply protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN115603284A true CN115603284A (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110773910.3A Pending CN115603284A (en) | 2021-07-08 | 2021-07-08 | Butt joint input power supply protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117155078A (en) * | 2023-10-30 | 2023-12-01 | 江苏天合储能有限公司 | Control circuit and control method of power module and power module |
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2021
- 2021-07-08 CN CN202110773910.3A patent/CN115603284A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117155078A (en) * | 2023-10-30 | 2023-12-01 | 江苏天合储能有限公司 | Control circuit and control method of power module and power module |
| CN117155078B (en) * | 2023-10-30 | 2024-01-30 | 江苏天合储能有限公司 | Control circuit and control method of power module and power module |
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