CN210669506U - Overcurrent protection control circuit and direct-current power supply - Google Patents
Overcurrent protection control circuit and direct-current power supply Download PDFInfo
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- CN210669506U CN210669506U CN201921719315.6U CN201921719315U CN210669506U CN 210669506 U CN210669506 U CN 210669506U CN 201921719315 U CN201921719315 U CN 201921719315U CN 210669506 U CN210669506 U CN 210669506U
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Abstract
The embodiment of the utility model discloses overcurrent protection control circuit and DC power supply is applied to DC power supply, should include: the sampling resistor is connected in series with a positive pole loop of the direct current power supply and is used for collecting the output current of the direct current power supply; the I-V conversion module comprises a first input end, a second input end and a first output end, the first input end is connected with the direct current output end of the direct current power supply, the second input end is connected with the direct current input end of the direct current power supply, and the I-V conversion module is used for converting the output current into a voltage signal; the trigger timing module comprises a third input end and a fourth input end, the third input end is connected with the direct current output end, the fourth input end is connected with the first output end, and the trigger timing module is used for outputting a logic level signal corresponding to the output current. In addition, the embodiment of the utility model provides a direct current power supply who uses this protection control circuit is still disclosed. Adopt the utility model discloses, can realize overcurrent protection to DC power supply.
Description
Technical Field
The utility model relates to a direct current power supply field especially relates to an overcurrent protection control circuit and direct current power supply.
Background
In practical applications, in order to ensure safe use of the dc power supply, a corresponding dc current detection circuit is generally disposed on the dc power supply to ensure safety of the output current of the dc power supply. The common direct current detection circuit is realized by connecting a sampling resistor in series in a positive circuit of a direct current power supply so as to solve the problem of complexity of common ground connection caused by connecting the sampling resistor in series at the negative electrode of the direct current power supply in the prior art; however, in the current detection scheme of the positive circuit, in order to solve the level shift problem of signal processing, an optical coupler is generally adopted to complete the transmission of analog quantity, so that the linearity of the detection circuit is not good.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an overcurrent protection control circuit and DC power supply for solve among the prior art because adopt the opto-coupler to accomplish the not good problem of handling of linearity that exists in the analog transmission.
The utility model discloses a concrete technical scheme as follows:
an overcurrent protection control circuit is applied to a direct-current power supply and comprises:
the sampling resistor is connected in series with a positive pole loop of the direct current power supply and is used for collecting the output current of the direct current power supply;
the I-V conversion module comprises a first input end, a second input end and a first output end, wherein the first input end is connected with a direct current output end of a direct current power supply, the second input end is connected with a direct current input end of the direct current power supply, and the I-V conversion module is used for converting the output current into a voltage signal;
the trigger timing module comprises a third input end and a fourth input end, the third input end is connected with the direct current output end, the fourth input end is connected with the first output end, the trigger timing module is used for outputting a logic level signal according to the voltage signal, and the logic level signal comprises a high level and a low level.
Further, the I-V conversion module comprises a filtering unit, an amplifying unit and a rectifying unit;
one end of the amplifying unit is connected with one end of the filtering unit, and the other end of the amplifying unit is connected with one end of the rectifying unit;
the other end of the filtering unit is connected with the first input end and the second input end;
the other end of the rectifying unit is connected with the first output end.
Further, the filtering unit includes a first resistor, a second resistor, a first capacitor and a second capacitor, the amplifying unit includes a third resistor, a fourth resistor and a first comparator, and the rectifying unit includes a fifth resistor and a rectifying diode, wherein:
one end of the first capacitor is grounded and is connected with the second capacitor, the other end of the first capacitor is connected with the first resistor, and the other end of the first resistor is connected with the first input end;
the other end of the second capacitor is connected with the second resistor, and the other end of the second resistor is connected with the second input end;
the third resistor is connected in series with the fourth resistor, the connection end of the third resistor and the fourth resistor is connected with the input end of the first comparator, the input end of the first comparator is also connected with the connection end of the second capacitor and the second resistor, and the fourth resistor is also connected with the output end of the first comparator;
the fifth resistor is connected with the rectifier diode in series, the other end of the fifth resistor is connected with the fourth resistor, the rectifier diode is connected with the first output end, and the fifth resistor is further connected with the fourth resistor and the connecting end of the output end of the first comparator.
Further, the trigger timing module comprises a charge and discharge unit, a level switching unit and a second comparator;
one end of the level switching unit is connected with the charging and discharging unit, the other end of the level switching unit is connected with the second comparator, and the level switching unit is used for controlling the input voltage of the second comparator;
the other end of the charge and discharge unit is connected with the third input end and the fourth input end.
Further, the trigger timing module further includes a third output terminal, a fourth output terminal, and a ground terminal, wherein:
the third output end is respectively connected with the level switch and the second comparator;
and the fourth output end and the grounding end are connected with the second comparator.
Further, the charge and discharge unit comprises a third capacitor and a sixth resistor;
the third capacitor is connected in parallel with the sixth resistor, one end of the third capacitor is connected with the third input end, and the other end of the third capacitor is connected with the fourth input end.
Further, the level switching unit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a triode;
one end of the ninth resistor is connected with the collector of the triode, and the other end of the ninth resistor is connected with the emitter of the triode;
one end of the tenth resistor is connected with the base electrode of the triode, and the other end of the tenth resistor is connected with the fourth output end;
the seventh resistor, the eighth resistor and the ninth resistor are connected in series, the connection end of the seventh resistor and the eighth resistor is connected with the second comparator, and the other end of the seventh resistor is connected with the third output end.
Further, the tenth resistor is a bias resistor for providing a bias current for the triode.
Furthermore, the overcurrent protection control circuit further comprises a first polarity capacitor and a second polarity capacitor, wherein the positive end of the first polarity capacitor is connected with the direct current input end, and the other end of the first polarity capacitor is grounded; and the positive end of the second polarity capacitor is connected with the direct current output end, and the other end of the second polarity capacitor is grounded.
A dc power supply comprising an overcurrent protection control circuit as claimed in any preceding claim.
Implement the embodiment of the utility model provides a, will have following beneficial effect:
after having adopted above-mentioned overcurrent protection control circuit and DC power supply, this circuit includes: the sampling resistor is connected in series with the positive circuit of the direct-current power supply and comprises a first input end V1, a second input end V2 and an I-V conversion module of a first output end, wherein the first input end V1 is connected with the direct-current output end, and the second input end V2 is connected with the direct-current input end; the trigger timing module comprises a third input end IS-and a fourth input end IS +, the third input end IS-IS connected with the direct current output end, and the fourth input end IS + IS connected with the first output end; specifically, the output current corresponding to the direct current power supply is obtained through the sampling resistor, the output current is converted through the I-V conversion module to obtain a voltage signal, and finally the timing module is triggered to output a current control signal according to the voltage signal so as to control the output current of the direct current power supply. The embodiment can effectively control the circuit overcurrent and realize the protection of the overcurrent circuit.
Drawings
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
fig. 1 is a schematic structural diagram of the overcurrent protection control circuit in one embodiment;
FIG. 2 is a schematic circuit diagram of the over-current protection control circuit in one embodiment;
FIG. 3 is a block diagram of the I-V transform module in one embodiment;
FIG. 4 is a diagram illustrating an exemplary implementation of the trigger timing module;
fig. 5 is a schematic structural diagram of the overcurrent protection control circuit in another embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In order to solve the problem that linearity is not good in processing when an overcurrent protection control circuit is used for completing transmission of analog quantity through an optical coupler in the prior art, in the embodiment, the overcurrent protection control circuit is particularly applied to overcurrent protection control of a power supply, and through sampling current signal processing on an anode loop of the power supply, a logic level signal is output for signal transmission, so that whether an overcurrent condition exists in output of the power supply is judged according to the output logic level signal, and the protection effect on the circuit is achieved.
The power source in this embodiment is a dc power source, such as a battery, a storage battery, a dc generator, and the like.
As shown in fig. 1 and 2, fig. 1 shows a structure of an overcurrent protection control circuit in this embodiment.
In a specific embodiment, the overcurrent protection control circuit comprises a sampling resistor 101, an I-V conversion module 102 and a trigger timing module; the sampling resistor 101 is connected in series with an anode loop of the direct-current power supply, namely between a direct-current input end VIN and a direct-current output end VOUT of the direct-current power supply, and the sampling operation of the direct-current power supply is realized based on the voltage division characteristic of the sampling resistor 101; the I-V conversion module 102 includes a first input terminal V1, a second input terminal V2 and a first output terminal, the first input terminal V1 is connected to the dc output terminal of the dc power supply, i.e., the connection terminal between the dc output terminal and the sampling resistor 101 is connected to the first input terminal V1; the second input end V2 is connected to a dc input end of the power supply, that is, the connection end of the dc input end to the sampling resistor 101 is connected to the second input end V2, and the I-V conversion module 102 is configured to convert a current signal into a voltage signal, that is, convert an output current of the dc power supply into a voltage signal and transmit the voltage signal to the departure timing module 103; the trigger timing module 103 comprises a third input end IS-and a fourth input end IS +, the fourth input end IS + IS connected with the first output end to realize the electrical connection between the I-V conversion module and the trigger timing module; the third input terminal IS-IS connected to the dc output terminal of the power supply, that IS, the connection terminal of the dc output terminal and the sampling resistor 101 IS connected to the third input terminal IS-, and the trigger timing module 103 IS configured to output a corresponding logic level signal according to a voltage signal which IS input to the trigger timing module 103 via the fourth input terminal IS + after passing through the first output port, where the logic level signal includes a high level and a low level, for example, a high level 1 IS output and a low level 0 IS output.
In this embodiment, after the I-V conversion module 102 converts the output current of the dc current collected by the sampling resistor 101 to obtain a voltage signal, the trigger timing module 103 outputs a corresponding logic level signal, and the circuit is controlled according to the logic level signal, that is, when the output current of the dc power supply is too high, the dc power supply is protected by a set protection circuit. Illustratively, if the trigger timing module 103 outputs a high level signal 1, which indicates that the output current is too high, at this time, the set protection circuit is started; on the contrary, if the trigger timing module 103 outputs a low level signal 0, it indicates that the output current is normal, i.e. the circuit where the dc power supply is located is working normally.
In one embodiment, as shown in fig. 3, the I-V transform module 102 includes a filtering unit 1021, an amplifying unit 1022, and a rectifying unit 1023; one end of the amplifying unit 1022 is connected to one end of the filtering unit 1021, and the other end of the amplifying unit 1022 is connected to one end of the rectifying unit 1023; the other end of the filtering unit 1021 is connected with the first input end V1 and the second input end V2, the filtering unit 1021 is used for filtering the output current flowing through the sampling resistor 101 to remove high-frequency noise signals existing in the output current, and the amplifying unit 1022 is used for amplifying the output current without the high-frequency noise signals in an in-phase proportion; the other end of the rectifying unit 1023 is connected with the first output end, and the rectifying unit 1023 is used for half-wave rectification of the output current amplified in the same phase proportion.
In this embodiment, through the filtering action of the filtering unit 1021 on the output current, the in-phase proportional amplification of the output current by the amplifying unit 1022, and the rectifying action of the rectifying unit 1023, the logic level signal factor affecting the output of the trigger timing module 103 in the output current is reduced, and the operation precision of current protection control is improved.
In one embodiment, as shown in fig. 2, the filtering unit 1021 includes a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, the amplifying unit 1022 includes a third resistor R3, a fourth resistor R4 and a first comparator U1-B, and the rectifying unit 1023 includes a fifth resistor R5 and a rectifying diode D1; one end of the first capacitor C1 is grounded and connected to the second capacitor C2, the other end is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the first input terminal V1; correspondingly, the other end of the second capacitor C2 is connected to the second resistor R2, and the other end of the second resistor R2 is connected to the second input terminal V2; the filter unit 1021 performs high-frequency noise filtering on the voltages at the first input terminal V1 and the second input terminal V2 through the first capacitor C1 and the second capacitor C2.
In one embodiment, as shown in fig. 2, the third resistor R3 is connected in series with the fourth resistor R4, the connection end of the third resistor R3 and the fourth resistor R4 is connected with the input end of the first comparator U1-B, specifically, the 6 port of the first comparator U1-B, and the input end of the first comparator U1-B is further connected with the connection end of the second capacitor C2 and the second resistor R2, specifically, the 5 port of the first comparator is connected with the connection end of the second capacitor C2 and the second resistor R2, and the fourth resistor R4 is further connected with the output end of the first comparator U1-B, that is, the 7 port of the first comparator U1-B is connected with the fourth resistor R4; the amplifying unit 1022 performs in-phase proportional amplification of the input current through the first comparator U1-B, and serves as a protection resistor through the fourth resistor R4 to prevent short circuit of the circuit.
In one embodiment, as shown in fig. 2, a fifth resistor R5 is connected in series with the rectifying diode D1, wherein the other end of the fifth resistor R5 is connected to the fourth resistor R4, and specifically, one end of the fifth resistor is connected to the connection end of the fourth resistor R4 and the port 7 of the first comparator U1-B; the other end of the rectifying diode D1 is connected with a first output end; the rectifying unit 1023 is used for rectifying the output current based on the unidirectional conduction characteristic of the rectifying diode D1, so that only the forward current flows into the trigger timing module 103 after passing through the rectifying unit 1023.
In one embodiment, as shown in fig. 4, the trigger timing module 103 includes a charge and discharge unit 1031, a level switching unit 1032, and a second comparator 1033; the level switching unit 1032 is connected to the charging and discharging unit 1031 at one end, and connected to the second comparator 1033 at the other end, where the level switching unit 1032 is configured to control an input voltage of the second comparator 1033, and the second comparator 1033 outputs a corresponding logic level signal according to the input voltage; the other end of the charge and discharge unit 1031 IS connected to the third input terminal IS-, the fourth input terminal IS +, and the charge and discharge unit 1031 IS configured to store the high-voltage charges transmitted from the I-V conversion circuit 102.
The trigger timing module 103 of this embodiment, in combination with the level switching unit 1032 and the charging and discharging unit 1031, implements control of the magnitude of the input voltage of the second comparator 1033, outputs a corresponding logic level signal based on the second comparator 1033, and determines the level of the output current of the dc power supply according to the output logic level signal, thereby implementing protection control operation of the dc power supply under an overcurrent condition, and achieving a protection effect of the dc power supply.
In one embodiment, as shown in fig. 2 and 4, the trigger timing module 103 further includes a third output terminal VCC, a fourth output terminal SD, and a ground terminal GND, where the third output terminal VCC is connected to the level switch 1032 and the second comparator 1033, respectively; the fourth output end SD and the ground end GND are both connected with the second comparator; specifically, the third output terminal VCC is connected to the port 8 of the second comparator U1-a, and is used for supplying current to the external device when the dc power supply is working normally (but not under the condition of current flow); the fourth output end SD is connected to port 1 of the second comparator U1-a, and is used for voltage division under the condition that the output current of the dc power supply is overcurrent, so as to achieve the protection effect of the dc power supply; the ground terminal GND is connected to the port 4 of the second comparator U1-a.
In one embodiment, as shown in fig. 2, the charge and discharge unit 1031 includes a third capacitor C3 and a sixth resistor R6; the level switching unit 1032 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a transistor Q1; in this embodiment, in a normal operating state of the output current of the dc power supply, the third capacitor C3 IS used to store the high-voltage charge in the I-V conversion module 102, that IS, to charge the third capacitor C3 at this time; in the case that the output current of the dc power supply is over-current, the third capacitor C3 cannot be charged by the I-V conversion module 102, and is discharged by the sixth resistor R6.
In one embodiment, as shown in fig. 2, the ninth resistor R9 has one end connected to the collector of the transistor Q1 and the other end connected to the emitter of the transistor Q1; one end of the tenth resistor R10 is connected with the base of the triode Q1, the other end of the tenth resistor R10 is connected with the fourth output end SD, and the fourth output end SD is connected with the port 1 of the second comparator U1-A; the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are connected in series, a connection end of the seventh resistor R7 and the eighth resistor R8 IS connected to the second comparator U1-a, specifically, to a port 2 of the second comparator U1-a, the other end of the seventh resistor R7 IS connected to the third output terminal VCC, meanwhile, the third output terminal VCC IS also connected to a port 8 of the second comparator U1-a, and a fourth input terminal IS + of the trigger timing module 103 IS connected to a port 3 of the second comparator U1-a.
In the embodiment, the tenth resistor R10 functions as a bias, i.e., a bias resistor, for providing a bias current for the transistor Q1.
In a specific embodiment, the voltage at the port 3 of the second comparator U1-a is the charged voltage of the third capacitor C3, and the magnitude of the charged voltage is related to the magnitude of the current flowing through the sampling resistor RS, and when the current on the sampling resistor RS is larger, the voltage on the third capacitor C3 is larger; when the voltage at the port 3 of the second comparator U1-A is greater than the voltage at the port 2, the second comparator U1-A triggers, namely the port 1 of the second comparator U1-A outputs a high level as a logic level signal and outputs the logic level signal, at this time, the current at the sampling resistor RS is indicated to be overlarge, the circuit enters a protection state, meanwhile, the triode Q1 is conducted, the ninth resistor R9 is short-circuited, and the voltage is divided by the seventh resistor R7 and the eighth resistor R8, so that the voltage at the port 2 of the second comparator U1-A is reduced; and when the current on the sampling resistor RS is too large, that is, after the second comparator U1-a is triggered, the dc power supply is cut off, and no output current can be generated, the third capacitor C3 cannot be effectively charged at this time, the third capacitor C3 discharges through the sixth resistor R6 at this time, and after the third capacitor C3 discharges, because the voltage at the port 3 of the second comparator U1-a is equal to the voltage at the third capacitor C3, the voltage at the port 3 of the second comparator U1-a decreases during the discharging process of the third capacitor C3 until the voltage at the port 3 is continuously lower than the voltage at the port 2, at this time, the logic level signal output by the port 1 is a low level signal, that is, 0, at this time, the output current of the dc power supply is normal, and the protection of the dc power supply is realized.
In the embodiment, the voltage of the port 2 of the second comparator U1-a is changed by the level switching unit 1032, that is, when the output current on the sampling resistor RS is in a safe range, the voltage of the port 2 of the second comparator U1-a is higher than the voltage of the port 3, at this time, the logic level signal output by the port 1 of the second comparator U1-a is low level 0, the transistor Q1 is not turned on, and the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are connected in series and then divided; when the current on the sampling resistor RS is too high, that is, the current exceeds the safety range, the voltage at the port 3 of the second comparator U1-a is higher than the voltage at the port 2, that is, the voltage at the third capacitor C3 is higher than the voltage at the port 2 of the second comparator U1-a, at this time, the logic level signal output by the port 1 of the second comparator U1-a is high level 1, at this time, the incoming line of the direct current power supply is cut off, so that the third capacitor C3 cannot perform the charging operation, and then the third capacitor C3 discharges through the sixth resistor R6; meanwhile, the triode Q1 is turned on, the ninth resistor R9 is short-circuited, and the turned-on triode Q1 divides voltage through the seventh resistor R7 and the eighth resistor R8, so that the voltage of the port 3 of the second comparator U1-a is gradually reduced, until the voltage of the port 3 is smaller than the voltage of the port 2, the output current of the direct current power supply is restored to a safe range, and the direct current power supply normally works, so that overcurrent protection of the direct current power supply is realized.
The safety range of the output current of the sampling resistor RS is different according to the safety range of the output current of different types of dc power supplies such as a battery and a dc generator, and is not limited herein.
In one embodiment, as shown in fig. 2, 4 and 5, the overcurrent protection control circuit further includes a first polarity capacitor EC1 and a second polarity capacitor EC2, wherein a positive terminal of the first polarity capacitor EC1 is connected to the dc input terminal VIN, and the other terminal is grounded; the positive terminal of the second polarity capacitor EC2 is connected to the dc output terminal VOUT, and the other terminal is grounded. This embodiment plays the filtering action through first polarity electric capacity EC1 and second polarity electric capacity EC2 to filter DC power supply output current's clutter signal, with the logic level signal that the promotion obtained according to output current, can better reflect DC power supply actual conditions, guarantee DC power supply's safe handling.
Based on the same inventive concept, this embodiment further provides a dc power supply, which includes the above-mentioned over-current protection control circuit to implement over-current protection control operation on the dc power supply, that is, to output different control signals according to the magnitude of the output current of the dc power supply to implement protection on the dc power supply, and the specific implementation principle may be described with reference to the above-mentioned over-current protection control circuit implementation principle, which is not described herein again.
After having adopted above-mentioned overcurrent protection control circuit and DC power supply, this circuit includes: the sampling resistor is connected in series with the positive circuit of the direct-current power supply and comprises a first input end V1, a second input end V2 and an I-V conversion module of a first output port, wherein the first input end V1 is connected with the direct-current output end, and the second input end V2 is connected with the direct-current input end; the trigger timing module comprises a third input end IS-and a fourth input end IS +, the third input end IS-IS connected with the direct current output end, and the fourth input end IS + IS connected with the first output end; specifically, the output current corresponding to the direct current power supply is obtained through the sampling resistor, the output current is converted through the I-V conversion module to obtain a voltage signal, and finally the timing module is triggered to output a current control signal according to the voltage signal, so that the output current of the direct current power supply is controlled. The embodiment can effectively control the circuit overcurrent and realize the protection of the overcurrent circuit.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. An overcurrent protection control circuit, characterized in that, be applied to DC power supply, includes:
the sampling resistor is connected in series with a positive pole loop of the direct current power supply and is used for collecting the output current of the direct current power supply;
the I-V conversion module comprises a first input end, a second input end and a first output end, wherein the first input end is connected with a direct current output end of a direct current power supply, the second input end is connected with a direct current input end of the direct current power supply, and the I-V conversion module is used for converting the output current into a voltage signal;
the trigger timing module comprises a third input end and a fourth input end, the third input end is connected with the direct current output end, the fourth input end is connected with the first output end, the trigger timing module is used for outputting a logic level signal according to the voltage signal, and the logic level signal comprises a high level and a low level.
2. The overcurrent protection control circuit of claim 1, wherein said I-V conversion module comprises a filtering unit, an amplifying unit, and a rectifying unit;
one end of the amplifying unit is connected with one end of the filtering unit, and the other end of the amplifying unit is connected with one end of the rectifying unit;
the other end of the filtering unit is connected with the first input end and the second input end;
the other end of the rectifying unit is connected with the first output end.
3. The overcurrent protection control circuit as set forth in claim 2, wherein the filter unit comprises a first resistor, a second resistor, a first capacitor and a second capacitor, the amplifying unit comprises a third resistor, a fourth resistor and a first comparator, and the rectifying unit comprises a fifth resistor and a rectifying diode, wherein:
one end of the first capacitor is grounded and is connected with the second capacitor, the other end of the first capacitor is connected with the first resistor, and the other end of the first resistor is connected with the first input end;
the other end of the second capacitor is connected with the second resistor, and the other end of the second resistor is connected with the second input end;
the third resistor is connected in series with the fourth resistor, the connection end of the third resistor and the fourth resistor is connected with the input end of the first comparator, the input end of the first comparator is also connected with the connection end of the second capacitor and the second resistor, and the fourth resistor is also connected with the output end of the first comparator;
the fifth resistor is connected with the rectifier diode in series, the other end of the fifth resistor is connected with the fourth resistor, the rectifier diode is connected with the first output end, and the fifth resistor is further connected with the fourth resistor and the connecting end of the output end of the first comparator.
4. The overcurrent protection control circuit of claim 1, wherein the trigger timing module comprises a charge-discharge unit, a level switching unit, and a second comparator;
one end of the level switching unit is connected with the charging and discharging unit, the other end of the level switching unit is connected with the second comparator, and the level switching unit is used for controlling the input voltage of the second comparator;
the other end of the charge and discharge unit is connected with the third input end and the fourth input end.
5. The overcurrent protection control circuit of claim 4, wherein the trigger timing module further comprises a third output terminal, a fourth output terminal, and a ground terminal, wherein:
the third output end is respectively connected with the level switching unit and the second comparator;
and the fourth output end and the grounding end are connected with the second comparator.
6. The overcurrent protection control circuit as set forth in claim 5, wherein said charging and discharging unit comprises a third capacitor and a sixth resistor;
the third capacitor is connected in parallel with the sixth resistor, one end of the third capacitor is connected with the third input end, and the other end of the third capacitor is connected with the fourth input end.
7. The overcurrent protection control circuit as set forth in claim 6, wherein said level switching unit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and a transistor;
one end of the ninth resistor is connected with the collector of the triode, and the other end of the ninth resistor is connected with the emitter of the triode;
one end of the tenth resistor is connected with the base electrode of the triode, and the other end of the tenth resistor is connected with the fourth output end;
the seventh resistor, the eighth resistor and the ninth resistor are connected in series, the connection end of the seventh resistor and the eighth resistor is connected with the second comparator, and the other end of the seventh resistor is connected with the third output end.
8. The overcurrent protection control circuit as recited in claim 7, wherein said tenth resistor is a bias resistor for providing a bias current to said transistor.
9. The overcurrent protection control circuit as recited in any one of claims 1 to 8, further comprising a first polarity capacitor and a second polarity capacitor, wherein a positive terminal of the first polarity capacitor is connected to the dc input terminal, and another terminal of the first polarity capacitor is grounded; and the positive end of the second polarity capacitor is connected with the direct current output end, and the other end of the second polarity capacitor is grounded.
10. A direct current power supply comprising the overcurrent protection control circuit as set forth in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921719315.6U CN210669506U (en) | 2019-10-12 | 2019-10-12 | Overcurrent protection control circuit and direct-current power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921719315.6U CN210669506U (en) | 2019-10-12 | 2019-10-12 | Overcurrent protection control circuit and direct-current power supply |
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| CN210669506U true CN210669506U (en) | 2020-06-02 |
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