CN216598959U - Self-recovery overcurrent protection circuit and direct-current power supply device - Google Patents
Self-recovery overcurrent protection circuit and direct-current power supply device Download PDFInfo
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- CN216598959U CN216598959U CN202123270438.6U CN202123270438U CN216598959U CN 216598959 U CN216598959 U CN 216598959U CN 202123270438 U CN202123270438 U CN 202123270438U CN 216598959 U CN216598959 U CN 216598959U
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Abstract
The utility model provides a self-resuming overcurrent protection circuit and DC power supply device. The self-recovery overcurrent protection circuit comprises a first switch circuit, a current sampling circuit and an overcurrent switch circuit, wherein the input end of the first switch circuit is connected with a power supply end, the output end of the first switch circuit is connected with a power supply output end, the current sampling circuit is connected between the power supply end and the input end of the first switch circuit in series, a trigger end of the overcurrent switch circuit is connected with the output end of the current sampling circuit, and the output end of the overcurrent switch circuit is connected with a controlled end of the first switch circuit. The utility model discloses aim at eliminating ambient temperature to the influence of overcurrent protection circuit work, improve the stability and the reliability of overcurrent protection circuit work among the direct current circuit.
Description
Technical Field
The utility model relates to an overcurrent protection field, in particular to self-resuming overcurrent protection circuit and DC power supply device.
Background
In the current design of the direct current power supply, in order to prevent the short circuit of the rear power supply from influencing the normal operation of the front power supply, a PTC self-recovery fuse is generally connected in series in a power supply loop to realize the self-recovery overcurrent protection function. However, the PTC self-recovery fuse is easily affected by the ambient temperature, and the response time is long, which affects the reliability of the overcurrent protection circuit in the dc power supply to perform the overcurrent protection action.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a self-resuming overcurrent protection circuit aims at eliminating ambient temperature to overcurrent protection circuit work's influence, improves overcurrent protection circuit work's among the direct current circuit stability and reliability.
In order to achieve the above object, the utility model provides a self-resuming overcurrent protection circuit, self-resuming overcurrent protection circuit includes:
a first switch circuit, an input terminal of the first switch circuit being connected to a power supply terminal, an output terminal of the first switch circuit being connected to a power supply output terminal, the first switch circuit being configured to be in a normally-on state;
a current sampling circuit connected in series between the power supply terminal and an input terminal of the first switching circuit;
the trigger end of the overcurrent switch circuit is connected with the output end of the current sampling circuit, and the output end of the overcurrent switch circuit is connected with the controlled end of the first switch circuit;
the current sampling circuit is used for detecting the current value output by the power supply end and outputting a corresponding current detection signal;
the overcurrent switch circuit is used for starting working when the voltage value of the current detection signal is greater than the starting voltage of the overcurrent switch circuit so as to output a trigger signal to control the first switch circuit to be in a turn-off state;
the overcurrent switch circuit is also used for keeping a turn-off state when the voltage value of the current detection signal is smaller than the turn-on voltage of the overcurrent switch circuit.
Optionally, the first switch circuit includes a first switch tube, a first resistor and a second resistor, the first end of the first resistor and the source electrode of the first switch tube are both connected to the power supply end through the current sampling circuit, the drain electrode of the first switch tube is connected to the power output end, the second end of the first resistor and the first end of the second resistor are respectively connected to the gate of the first switch tube, and the second end of the second resistor is grounded.
Optionally, the first switch tube is a PMOS tube.
Optionally, the current sampling circuit includes a current sampling resistor, a first end of the current sampling resistor is connected to the power supply terminal, and a second end of the current sampling resistor is connected to the first end of the first resistor.
Optionally, the overcurrent switch circuit includes a first triode, an input end of the first triode is connected with a first end of the current sampling resistor, an output end of the first triode is connected with a second end of the first resistor, and a trigger end of the first triode is connected with a second end of the current sampling resistor.
Optionally, the first triode is a PNP triode.
Optionally, the self-recovery overcurrent protection circuit further includes:
the slow starting circuit is electrically connected with the controlled end of the first switch circuit;
the slow starting circuit is used for delaying the time for switching the first switch circuit from the off state to the on state.
Optionally, the self-recovery overcurrent protection circuit further includes:
the slow starting circuit comprises a third resistor and a first capacitor, the first end of the first capacitor is connected with the source electrode of the first switching tube, the second end of the first capacitor and the first end of the third resistor are respectively connected with the grid electrode of the first switching tube, and the first end of the third resistor is connected with the second end of the first resistor.
The utility model also provides a DC power supply device, including above-mentioned arbitrary item the self-resuming overcurrent protection circuit.
The utility model discloses self-resuming overcurrent protection circuit includes first switch circuit, current sampling circuit and overcurrent switch circuit. Wherein the first switching circuit is configured to be in a normally on state; the current sampling circuit is used for detecting the current value output by the power supply end and outputting a corresponding current detection signal; the overcurrent switch circuit is used for starting working when the voltage value of the current detection signal is greater than the starting voltage of the overcurrent switch circuit so as to output a trigger signal to control the first switch circuit to be in a turn-off state; the overcurrent switch circuit is also used for keeping the off state when the voltage value of the current detection signal is smaller than the starting voltage of the overcurrent switch circuit. Therefore, the utility model discloses just can be from resumeing overcurrent protection circuit detects the overcurrent state through the hardware and control first switch tube circuit and be in the off-state when overflowing to prevent to overflow and cause the harm to DC power supply or back stage circuit, and when overflowing and stop, reply to the on-state by oneself. Therefore, the influence of the ambient temperature on the work of the over-current protection circuit is eliminated, and meanwhile, due to the adoption of hardware to execute the operation, the sensitivity of the self-recovery over-current protection circuit for executing the over-current protection action is effectively improved while the circuit cost is reduced, the response time for executing the over-current protection action is reduced, and the stability and the reliability of the work of the over-current protection circuit in the direct-current circuit are further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a module structure of an embodiment of the self-recovery overcurrent protection circuit of the present invention;
fig. 2 is a schematic diagram of a module structure of another embodiment of the self-recovery overcurrent protection circuit of the present invention;
fig. 3 is a specific circuit diagram of another embodiment of the self-recovery overcurrent protection circuit of the present invention;
fig. 4 is a schematic circuit diagram of another embodiment of the self-recovery overcurrent protection circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | |
| 30 | |
40 | Slow starting circuit |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
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.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In the current design of the direct current power supply, in order to prevent the short circuit of the rear power supply from influencing the normal operation of the front power supply, a PTC self-recovery fuse is generally connected in series in a power supply loop to realize the self-recovery overcurrent protection function. However, the PTC self-recovery fuse is easily affected by the ambient temperature, and the response time is long, which affects the reliability of the overcurrent protection of the dc power supply device.
For this reason, referring to fig. 1, in an embodiment of the present invention, the self-recovery overcurrent protection circuit includes:
a first switch circuit 10, an input terminal of the first switch circuit 10 being connected to a power supply terminal, an output terminal of the first switch circuit 10 being connected to a power supply output terminal, the first switch circuit 10 being configured to be in a normally on state;
a current sampling circuit 20, the current sampling circuit 20 being connected in series between a power supply terminal and an input terminal of the first switch circuit 10;
the trigger end of the overcurrent switch circuit 30 is connected with the output end of the current sampling circuit 20, and the output end of the overcurrent switch circuit 30 is connected with the controlled end of the first switch circuit 10;
a current sampling circuit 20 for detecting the current value outputted from the power supply terminal and outputting a corresponding current detection signal;
the overcurrent switch circuit 30 is configured to start working when the voltage value of the current detection signal is greater than the turn-on voltage of the overcurrent switch circuit 30, so as to output a trigger signal to control the first switch circuit 10 to be in a turn-off state;
the overcurrent switching circuit 30 is further configured to maintain an off state when the voltage value of the current detection signal is smaller than the turn-on voltage of the overcurrent switching circuit 30.
In this embodiment, the self-recovery overcurrent protection circuit is disposed in the DC power supply, and the power supply voltage output by the power supply terminal is provided by a power supply in the DC power supply, and optionally, the power supply may be a battery, an AC/DC conversion circuit, or a DC/DC circuit. The power supply end comprises a power supply positive end and a power supply negative end (grounding end), and the power supply output end comprises a power supply positive output end and a power supply negative output end. Optionally, the current sampling circuit 20 and the first switch circuit 10 may be disposed on the positive side of the dc power supply loop, that is, the positive terminal of the power supply is connected to the positive terminal of the post-stage circuit through the current sampling circuit 20, the first switch circuit 10 and the positive output terminal of the power supply, so as to provide the power supply voltage for the post-stage circuit. And the power supply negative electrode output end is directly connected with the power supply negative electrode end and is used for being connected with the negative electrode of the post-stage circuit. When the first switch circuit 10 is turned off, the path between the positive power supply terminal and the positive power supply terminal of the subsequent circuit is cut off, thereby stopping the subsequent circuit from operating, even if the current value output from the power supply terminal is reduced to 0;
optionally, the current sampling circuit 20 and the first switch circuit 10 may also be disposed on the negative side of the dc power supply loop, that is, the negative terminal (i.e., the ground terminal) of the power supply is connected to the negative terminal of the subsequent circuit via the current sampling circuit 20, the first switch circuit 10 and the negative terminal of the power supply, and the positive terminal of the power supply is electrically connected to the positive terminal of the subsequent circuit via the positive terminal of the power supply, so as to provide the power supply voltage for the subsequent circuit. When the first switch circuit 10 is turned off, the path between the negative electrode of the power supply and the negative electrode terminal of the power supply of the subsequent circuit is cut off, so that the subsequent circuit stops working even if the current value output by the power supply terminal is reduced to 0;
it can be understood that if the internal circuit of the dc power supply fails, which causes the current flowing through the self-recovery overcurrent protection circuit to be overcurrent, the current protection action is also triggered to turn off the first switch circuit 10, so as to prevent the damage of the later-stage circuit caused by the excessive current.
In this embodiment, the first switch circuit 10 can be implemented by using an up/down pull circuit and a switch tube electrically connected to the up/down pull circuit, such as a MOS transistor or a triode, where the up/down pull circuit is connected to a controlled end of the switch tube, so as to ensure that the switch tube is in a normally-on state. For example, the first switch circuit 10 employs a pull-down circuit and a PMOS transistor, the pull-down circuit is connected to a gate of the PMOS transistor, a source of the PMOS transistor is connected to a positive terminal of a power supply, and a drain of the PMOS transistor is connected to a positive output terminal of the power supply, so that the PMOS transistor is in a normally-on state.
In this embodiment, the current sampling circuit 20 may be implemented by selecting a resistive load, such as a current sensing resistor. The over-current switch circuit 30 can be implemented by a switch tube, such as a MOS tube, a triode, etc. Since the current sensing resistor is connected in series between the power supply terminal and the input terminal of the first switch tube, the current outputted from the power supply terminal flows through the current value of the current sensing resistor, so that the research and development personnel can select the resistance value of the current sensing resistor according to the on-voltage of the switch tube in the overcurrent switch circuit 30 and the required overcurrent value.
Optionally, the input terminal of the over-current switch circuit 30 may be connected to an external power supply, so as to output a trigger signal to control the first switch circuit 10 to be in an off state when the voltage value of the current sensing resistor, that is, the voltage value of the current detection signal output by the current sampling circuit 20, is greater than the turn-on voltage of the switch tube in the over-current switch circuit 30. For example, the input terminal of the over-current switch circuit 30 is connected to an external power supply, the voltage output by the external power supply is higher than the voltage output by the power supply terminal, the first switch circuit 10 is a PMOS transistor, when the over-current occurs, the voltage across the current sensing resistor is greater than the turn-on voltage of the over-current switch circuit 30, that is, the voltage value of the current detection signal is greater than the turn-on voltage of the over-current switch circuit 30, the path between the input terminal and the output terminal of the over-current switch circuit 30 is turned on, and the voltage across the controlled terminal of the PMOS transistor is pulled up to the external power supply, so that the PMOS transistor is turned off. When the PMOS transistor is turned off, the current on the current sensing resistor is zero, the voltage on the current sensing resistor is also zero, and the overcurrent switch circuit 30 is in an off state, so that the PMOS transistor is restored to an on state.
Optionally, the input terminal of the over-current switch circuit 30 may also be directly connected to a power supply terminal, for example, the first switch circuit 10 is a PMOS transistor, and the input terminal of the over-current switch circuit 30 is connected to the positive terminal of the power supply, so that when an over-current occurs, the gate voltage of the PMOS transistor is pulled up to the positive terminal voltage of the power supply, thereby turning off the PMOS transistor.
The utility model discloses self-resuming overcurrent protection circuit includes first switch circuit, current sampling circuit and overcurrent switch circuit. Wherein the first switching circuit is configured to be in a normally on state; the current sampling circuit is used for detecting the current value output by the power supply end and outputting a corresponding current detection signal; the overcurrent switch circuit is used for starting working when the voltage value of the current detection signal is greater than the starting voltage of the overcurrent switch circuit so as to output a trigger signal to control the first switch circuit to be in a turn-off state; the overcurrent switch circuit is also used for keeping the off state when the voltage value of the current detection signal is smaller than the starting voltage of the overcurrent switch circuit. Therefore, the utility model discloses just can be from resumeing overcurrent protection circuit detects the overcurrent state through the hardware and control first switch tube circuit and be in the off-state when overflowing to prevent to overflow and cause the harm to DC power supply or back stage circuit, and when overflowing and stop, reply to the on-state by oneself. Therefore, the influence of the ambient temperature on the work of the over-current protection circuit is eliminated, and meanwhile, due to the adoption of hardware to execute the operation, the sensitivity of the self-recovery over-current protection circuit for executing the over-current protection action is effectively improved while the circuit cost is reduced, the response time for executing the over-current protection action is reduced, and the stability and the reliability of the work of the over-current protection circuit in the direct-current circuit are further improved.
Optionally, referring to fig. 2, in an embodiment of the present invention, the first switch circuit 10 includes a first switch tube Q1, a first resistor R1 and a second resistor R2, a first end of the first resistor R1 and a source of the first switch tube Q1 are both connected to the power supply end through the current sampling circuit 20, a drain of the first switch tube Q1 is connected to the power supply output end, a second end of the first resistor R1 and a first end of the second resistor R2 are respectively connected to the gate of the first switch tube Q1, and a second end of the second resistor R2 is grounded.
The current sampling circuit 20 includes a current sampling resistor SR1, a first terminal of the current sampling resistor SR1 is connected to the power supply terminal, and a second terminal of the current sampling resistor SR1 is connected to a first terminal of a first resistor R1.
The overcurrent switching circuit 30 comprises a first triode Q2, an input end of a first triode Q2 is connected with a first end of a current sampling resistor SR1, an output end of a first triode Q2 is connected with a second end of a first resistor R1, and a controlled end of a first triode Q2 is connected with a second end of the current sampling resistor SR 1.
The first switch transistor Q1 is a PMOS transistor, and the first transistor Q2 is a PNP transistor.
In this embodiment, the current detection resistor SR1 and the first switch Q1 are disposed on the positive output loop of the dc power supply, i.e., connected to the positive power supply terminal of the power supply terminals, and the negative power supply terminal is the ground terminal. When the resistance value of the first resistor R1 and the resistance value of the second resistor R2 are selected, it needs to be satisfied that the driving voltage output to the gate of the first switch tube Q1 after dividing the power voltage accessed by the power terminal can control the first switch tube Q1 to be in a conducting state. For example, the resistance of the first resistor R1 is 10K, the resistance of the second resistor R2 is 10K, the first resistor R1 and the second resistor R2 divide the power voltage into one-half power voltage and output the divided power voltage to the gate of the first switch transistor Q1, since the first switch transistor Q1 is PMOS and the source voltage of the first switch transistor Q1 is the power voltage, the conduction condition of the PMOS transistor is satisfied, and the first switch transistor Q1 is in a normally-on state.
It should be understood that the first transistor Q2 is a PNP transistor, and the conduction condition is that the difference between the voltage Ue of the emitter (input terminal of the first transistor Q1) of the first transistor Q2 and the voltage Ub of the base (controlled terminal of the first transistor Q1) is greater than 0.7V. Since the first terminal of the current sensing resistor SR1 is connected to the emitter of the first transistor Q2, and the second terminal thereof is connected to the base of the first transistor Q2, the voltage across the current sensing resistor is the voltage difference Ueb between the emitter and the base of the first transistor Q2. Therefore, since the current detection resistor SR1 is connected in series in the path between the power supply terminal and the input terminal of the first switch circuit 10, the current flowing through the current detection resistor SR1 is the power supply terminal output current. In practical application, a user can set the resistance of the current detection resistor SR1 according to the specific overcurrent value of the overcurrent, for example, the user needs to set the overcurrent value of the current self-recovery overcurrent protection circuit to 2A, and only a 0.33 ohm current detection resistor SR1 needs to be set, so that the current output by the power supply terminal, that is, the current flowing through the first switch circuit 10, the current detection resistor and the subsequent circuit reaches 2A, and the voltage on the current detection resistor SR1 drives the first triode Q2 to be in a conducting state.
In this embodiment, the power output terminal is used for connecting to a subsequent circuit. When the current output by the power supply terminal reaches a preset overcurrent value due to a fault of a subsequent circuit or the like, the voltage of the current detection resistor SR1 drives the third transistor Q2 to be in a conducting state, the first transistor Q2 conducts a path between the power supply terminal and the gate of the first switch tube Q1, and the gate voltage of the first switch tube Q1 is directly pulled up to the power supply voltage, so that the first switch tube Q1 is in a turn-off state. Subsequently, since the first switch Q1 is in the off state, the current output by the power supply terminal is reduced to 0 value, and further the voltage value on the current detection resistor SR1 is reduced to below 0.7V, at this time, the first triode Q2 is in the off state again, the gate voltage of the first switch Q1 returns to the voltage on the first terminal of the second resistor R2, the first switch Q1 enters the on state again, and the path between the rear-stage circuit and the power supply terminal is turned on again. If the overcurrent problem is solved, for example, the rear-stage circuit is short-circuited instantaneously due to a user's misoperation and the fault is eliminated, the first switch tube Q1 will remain in a conducting state, so that the power supply end normally provides the power supply voltage for the rear-stage circuit. If the over-current problem is solved, the over-current protection action and the self-recovery action are repeated until the over-current problem is solved.
It should be understood that if still the trouble leads to overflowing the problem and does not solve with the load that the power output end of self-resuming overcurrent protection circuit is connected, in other words, be exactly the utility model discloses self-resuming overcurrent protection circuit is when overflowing the self-resuming after the disconnection, and the electric current that flows through whole circuit still is in the overcurrent state, and self-resuming overcurrent protection circuit can trigger current protection action and self-resuming action this moment (first switch circuit 10 breaks off when overflowing promptly, self-resuming again after the disconnection). However, if the first switch circuit 10 is still switched rapidly when an overcurrent occurs, the switch tube in the first switch circuit 10 may be damaged.
For this reason, referring to fig. 2, in an embodiment of the present invention, the self-recovery overcurrent protection circuit further includes:
the slow starting circuit 40, the slow starting circuit 40 is electrically connected with the controlled end of the first switch circuit 10;
the slow start circuit 40 is configured to delay a time when the first switch circuit 10 is switched from the off state to the on state.
In this embodiment, optionally, the slow start circuit 40 may be implemented by using an RC integration circuit, and by providing the RC integration circuit at the controlled end of the first switch tube, the duration of turning on the first switch circuit 10 may be delayed, that is, the time for switching the first switch circuit 10 from the off state to the fully on state may be prolonged.
Optionally, in an embodiment, referring to fig. 4, the self-recovery overcurrent protection circuit further includes a slow start circuit 40, the slow start circuit 40 includes a third resistor R3 and a first capacitor C1, a first end of the first capacitor C1 is connected to the source of the first switching transistor Q1, a second end of the first capacitor C1 and a first end of the third resistor R3 are respectively connected to the gate of the first switching transistor Q1, and a first end of the third resistor R3 is connected to the second end of the first resistor R1.
In this embodiment, a miller platform caused by a miller effect exists in the on process of the MOS transistor, and the miller effect will raise the Vgs voltage of the gate and the source, so that the on time is prolonged, and therefore, the falling time of Vds can be prolonged by only increasing the miller capacitance of the MOS transistor, so as to prolong the on time of the MOS transistor, that is, the time for switching the first switch circuit 10 from the off state to the fully on state is prolonged. As can be seen from the foregoing embodiments, the first switch Q1 is a PMOS transistor, so that the on-time of the first switch Q1 can be delayed by connecting a capacitor in parallel between the source and the gate and connecting a resistor to the gate, so that the resistor and the capacitor form an RC integrating circuit. After the second switch tube Q2 is triggered to be turned on and the self-recovery overcurrent protection circuit executes the overcurrent protection action, the first switch tube Q1 is in an off state, at this time, the current value on the current sampling resistor SR1 is zero, the second switch tube Q2 is in the off state again, at this time, the power supply voltage output by the power supply end is subjected to voltage division by the first resistor R1 and the second resistor R2, so that the first switch tube Q1 is in the on state (the specific process refers to the above embodiment), and under the influence of the third resistor R3, the first capacitor C1 and the miller effect, the on time of the first switch tube Q1 is prolonged, thereby preventing the over-fast switching action of the first switch tube Q1 from causing damage when the whole circuit is still in the overcurrent state, and effectively improving the reliability and stability of the operation of the self-recovery overcurrent protection circuit.
The utility model also provides a DC power supply device, DC power supply device includes as above-mentioned arbitrary self-resuming overcurrent protection circuit.
It is worth noting, because the utility model discloses DC power supply device is based on foretell self-resuming overcurrent protection circuit, consequently, the utility model discloses DC power supply device's embodiment includes the whole technical scheme of the whole embodiments of above-mentioned self-resuming overcurrent protection circuit, and the technological effect that reaches is also identical, no longer gives unnecessary details here.
The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (9)
1. A self-healing over-current protection circuit, comprising:
a first switch circuit, an input terminal of the first switch circuit being connected to a power supply terminal, an output terminal of the first switch circuit being connected to a power supply output terminal, the first switch circuit being configured to be in a normally-on state;
a current sampling circuit connected in series between the power supply terminal and an input terminal of the first switching circuit;
the trigger end of the overcurrent switch circuit is connected with the output end of the current sampling circuit, and the output end of the overcurrent switch circuit is connected with the controlled end of the first switch circuit;
the current sampling circuit is used for detecting the current value output by the power supply end and outputting a corresponding current detection signal;
the overcurrent switch circuit is used for starting working when the voltage value of the current detection signal is greater than the starting voltage of the overcurrent switch circuit so as to output a trigger signal to control the first switch circuit to be in a turn-off state;
the overcurrent switch circuit is also used for keeping a turn-off state when the voltage value of the current detection signal is smaller than the turn-on voltage of the overcurrent switch circuit.
2. The self-recovery overcurrent protection circuit according to claim 1, wherein the first switch circuit includes a first switch tube, a first resistor, and a second resistor, a first end of the first resistor and a source of the first switch tube are both connected to the power supply terminal through the current sampling circuit, a drain of the first switch tube is connected to the power supply output terminal, a second end of the first resistor and a first end of the second resistor are respectively connected to a gate of the first switch tube, and a second end of the second resistor is grounded.
3. The self-recovery overcurrent protection circuit of claim 2, wherein the first switching tube is a PMOS tube.
4. The self-healing overcurrent protection circuit of claim 2, wherein the current sampling circuit comprises a current sampling resistor, a first terminal of the current sampling resistor being connected to the power supply terminal, and a second terminal of the current sampling resistor being connected to a first terminal of the first resistor.
5. The self-healing over-current protection circuit of claim 4, wherein the over-current switching circuit comprises a first transistor, an input terminal of the first transistor is connected to a first terminal of the current sampling resistor, an output terminal of the first transistor is connected to a second terminal of the first resistor, and a trigger terminal of the first transistor is connected to a second terminal of the current sampling resistor.
6. The self-healing over-current protection circuit of claim 5, wherein the first transistor is a PNP transistor.
7. The self-healing over-current protection circuit of claim 1, further comprising:
the slow starting circuit is electrically connected with the controlled end of the first switch circuit;
the slow starting circuit is used for delaying the time for switching the first switch circuit from the off state to the on state.
8. The self-healing overcurrent protection circuit of claim 5, further comprising:
the slow starting circuit comprises a third resistor and a first capacitor, the first end of the first capacitor is connected with the source electrode of the first switch tube, the second end of the first capacitor and the first end of the third resistor are respectively connected with the grid electrode of the first switch tube, and the first end of the third resistor is connected with the second end of the first resistor.
9. A dc power supply apparatus comprising the self-recovery overcurrent protection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123270438.6U CN216598959U (en) | 2021-12-23 | 2021-12-23 | Self-recovery overcurrent protection circuit and direct-current power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123270438.6U CN216598959U (en) | 2021-12-23 | 2021-12-23 | Self-recovery overcurrent protection circuit and direct-current power supply device |
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| Publication Number | Publication Date |
|---|---|
| CN216598959U true CN216598959U (en) | 2022-05-24 |
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|---|---|---|---|
| CN202123270438.6U Active CN216598959U (en) | 2021-12-23 | 2021-12-23 | Self-recovery overcurrent protection circuit and direct-current power supply device |
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| CN (1) | CN216598959U (en) |
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2021
- 2021-12-23 CN CN202123270438.6U patent/CN216598959U/en active Active
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