CN219892960U - Power supply protection circuit and vehicle - Google Patents
Power supply protection circuit and vehicle Download PDFInfo
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- CN219892960U CN219892960U CN202321510115.6U CN202321510115U CN219892960U CN 219892960 U CN219892960 U CN 219892960U CN 202321510115 U CN202321510115 U CN 202321510115U CN 219892960 U CN219892960 U CN 219892960U
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Abstract
The present disclosure relates to a power supply protection circuit and a vehicle, the power supply protection circuit including: the detection control module and the switch module; the switch module is electrically connected between the power supply end and the load; the detection control module is respectively and electrically connected with the power supply end and the switch module and is used for detecting the power supply current of the power supply and the access voltage of the power supply; the detection control module generates a first level signal based on a detection result that the power supply current is larger than the threshold current or the access voltage is opposite to the set voltage, and outputs the first level signal to the switch module so as to disconnect the switch module; the detection control module generates a second level signal based on the detection result that the power supply current is smaller than or equal to the threshold current and the access voltage is the same as the set voltage, and outputs the second level signal to the switch module so as to conduct the switch module. The protection circuit can be protected when the power supply circuit is in overcurrent, and can be protected when the circuit is reversely connected, so that the protection function of the circuit is improved, meanwhile, an anti-reflection diode is not required to be arranged, and the power consumption generated by the anti-reflection diode is reduced.
Description
Technical Field
The disclosure relates to the technical field of automobiles, in particular to a power supply protection circuit and a vehicle.
Background
An ECU (Electronic Control Unit ) of a vehicle typically requires a power supply to supply power to it to ensure proper operation of the ECU. In order to ensure that the vehicle can normally run, the running safety of the power circuit is required to be ensured, and the power circuit is prevented from being faulty, so that the vehicle is abnormal.
In the general power supply process, the power supply input protection circuit has a plurality of schemes, but the function is single, for example, an anti-reverse diode is usually connected in the prior art, and only the reverse connection of the anode and the cathode of the power supply can be prevented, and the anti-reverse diode has a PN junction, so that the internal voltage drop is larger, and the useless power consumption of the circuit can be increased.
Disclosure of Invention
In order to solve the technical problem, the disclosure provides a power supply protection circuit and a vehicle, which not only can protect the circuit when the power supply circuit is in overcurrent, but also can protect the circuit when the circuit is reversely connected, so that the protection function of the circuit is improved, and meanwhile, an anti-reflection diode is not required to be arranged, and the power consumption generated by the anti-reflection diode is reduced.
In a first aspect, a power supply protection circuit includes: the detection control module and the switch module;
the switch module is electrically connected between the power supply end and the load;
the detection control module is respectively and electrically connected with the power supply end and the switch module, and is used for detecting the power supply current of the power supply and the access voltage of the power supply;
the detection control module generates a first level signal based on a detection result that the power supply current is larger than the threshold current or the access voltage is opposite to the set voltage, and outputs the first level signal to the switch module so as to disconnect the switch module;
and the detection control module generates a second level signal based on the detection result that the power supply current is smaller than or equal to the threshold current and the access voltage is the same as the set voltage, and outputs the second level signal to the switch module so as to conduct the switch module.
In some embodiments, the switch module is electrically connected between the positive supply terminal and the positive pole of the load; alternatively, the switch module is electrically connected between the negative supply terminal and the negative pole of the load.
In some embodiments, the detection control module includes an overcurrent detection unit, an anti-reverse detection unit, and a logic processing unit;
the detection end of the overcurrent detection unit is electrically connected with a power supply loop of the power supply and is used for detecting the power supply current of the power supply; the detection end of the reverse connection prevention detection unit is electrically connected with the power supply end and is used for detecting the access voltage of the power supply; the output end of the overcurrent detection unit is electrically connected with the first input end of the logic processing unit; the output end of the reverse connection preventing detection unit is electrically connected with the second input end of the logic processing unit;
the logic processing unit is used for controlling the on/off of the switch module according to the detection result of the overcurrent detection unit and the detection result of the reverse connection prevention detection unit.
In some embodiments, the overcurrent detection unit comprises a detection resistor and a signal acquisition chip;
the detection resistor is connected in series between the power supply end and the load; the first end of the detection resistor is also electrically connected with the first input end of the signal acquisition chip; the second end of the detection resistor is also electrically connected with the second input end of the signal acquisition chip; the output end of the signal acquisition chip is electrically connected with the output end of the overcurrent detection unit.
In some embodiments, the anti-reverse connection detection unit comprises a first switching element, and a control end of the first switching element is electrically connected with a detection end of the anti-reverse connection detection unit; the first end of the first switch element is electrically connected with the pull-up power supply and the output end of the reverse connection preventing detection unit respectively; the second end of the first switching element is grounded.
In some embodiments, the anti-reverse connection detection unit further comprises a pull-up resistor, wherein a first end of the pull-up resistor is connected between the first end of the first switching element and an output end of the anti-reverse connection detection unit; the second end of the pull-up resistor is electrically connected with the pull-up power supply.
In some embodiments, the logic processing unit comprises an or gate, a first input of the or gate being electrically connected to a first input of the logic processing unit; the second input end of the OR gate is electrically connected with the second input end of the logic processing unit; the output end of the OR gate is electrically connected with the output end of the logic processing unit.
In some embodiments, the detection end of the anti-reverse connection detection unit is electrically connected with the positive electrode power supply end; or the detection end of the reverse connection prevention detection unit is electrically connected with the negative electrode power supply end.
In some embodiments, the switching module includes a second switching element having a control terminal electrically connected to the control terminal of the switching module; a first end of the second switching element is electrically connected with a first end of the switching module; the second end of the second switching element is electrically connected with the second end of the switching module.
In a second aspect, the present disclosure also provides a vehicle comprising a power protection circuit as claimed in any one of the first aspects.
The disclosed embodiment provides a power supply protection circuit including: the detection control module and the switch module; the switch module is electrically connected between the power supply end and the load; the detection control module is respectively and electrically connected with the power supply end and the switch module and is used for detecting the power supply current of the power supply and the access voltage of the power supply; the detection control module generates a first level signal based on a detection result that the power supply current is larger than the threshold current or the access voltage is opposite to the set voltage, and outputs the first level signal to the switch module so as to disconnect the switch module; the detection control module generates a second level signal based on the detection result that the power supply current is smaller than or equal to the threshold current and the access voltage is the same as the set voltage, and outputs the second level signal to the switch module so as to conduct the switch module. In the embodiment of the disclosure, the output end of the detection control module is connected with the switch module, the switch module is electrically connected between the power supply end and the load, the detection control module is used for collecting the power supply current and the access voltage in the power supply circuit in real time, when the power supply current is larger than the threshold current, the circuit is determined to be overcurrent, when the polarity of the access voltage is opposite to that of the set voltage, the power supply is determined to be reversely connected, when any condition is met, the electric connection between the power supply end and the load is required to be disconnected, and the circuit is prevented from being damaged, so that the detection control module outputs a first level signal to the switch module to control the switch module to be disconnected. And when the power supply current is smaller than or equal to the threshold current and the access voltage is the same as the set voltage, generating a second level signal to control the switch module to be conducted. The power supply protection circuit provided by the embodiment of the disclosure not only can protect the circuit when the power supply circuit is in overcurrent, but also can protect the circuit when the circuit is reversely connected, so that the protection function of the circuit is increased, and meanwhile, an anti-reflection diode is not required to be arranged, so that the power consumption generated by the anti-reflection diode is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a power protection circuit according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a power protection circuit according to another embodiment of the disclosure;
fig. 3 is a schematic structural diagram of a power protection circuit according to another embodiment of the disclosure;
fig. 4 is a schematic structural diagram of a power protection circuit according to another embodiment of the disclosure;
fig. 5 is a schematic structural diagram of a power protection circuit according to another embodiment of the disclosure;
fig. 6 is a schematic structural diagram of a power protection circuit according to another embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a power protection circuit according to another embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a power protection circuit according to another embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a power protection circuit according to another embodiment of the present disclosure.
10, detecting a control module; 11. an overcurrent detection unit; 111. a signal acquisition chip; 12. an anti-reverse connection detection unit; 13. a logic processing unit; 131. or gate; 20. a switch module; q1, a first switching element; q2, a second switching element; VCC, pull-up power supply; r1, detecting resistance; r2, pull-up resistor.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
An embodiment of the present disclosure provides a power protection circuit, and fig. 1 is a schematic structural diagram of the power protection circuit provided in the embodiment of the present disclosure, as shown in fig. 1, the power protection circuit includes: a detection control module 10 and a switch module 20.
The switch module 20 is electrically connected between the power supply terminal and the load.
The detection control module 10 is electrically connected to the power supply terminal and the switch module 20, and the detection control module 10 is used for detecting a power supply current of the power supply and an access voltage of the power supply.
The detection control module 10 generates a first level signal based on a detection result that the supply current is greater than the threshold current or the cut-in voltage is opposite to the set voltage, and outputs the first level signal to the switching module to turn off the switching module.
The detection control module 10 generates a second level signal based on the detection result that the supply current is less than or equal to the threshold current and the access voltage is the same as the set voltage, and outputs the second level signal to the switch module so as to enable the switch module to be conducted.
In the embodiment of the disclosure, the power protection circuit includes a detection control module 10 and a switch module 20, wherein the switch module is connected between a power supply end and a load, and when the switch module 20 is turned on, a path is formed between the power supply end and the load, and the power supply end can supply power to the load; when the switch module 20 is turned off, the power supply end is disconnected from the load, and the power supply end stops supplying power to the load. The detection control module 10 is electrically connected with the power supply end and the switch module 20, the detection control module 10 is electrically connected with the power supply end, so that the power supply current and the access voltage in the power supply loop can be detected, and when the power supply current or the access voltage is abnormal, the detection control module 10 can control the on/off of the switch module 20 through being electrically connected with the switch module 20, so that the on/off between the power supply end and the load is controlled.
Further, a threshold current is set, when the supply current is larger than the threshold current, the condition that the circuit is over-current is indicated, and when the polarity of the access voltage is opposite to that of the set voltage (for example, the set voltage is a positive value, the detected access voltage is a negative value), the condition that the power supply is reversely connected in the circuit is indicated, and the conditions can influence the safety of the circuit and damage electronic components in the circuit. Therefore, the detection control module 10 generates a first level signal based on the detection result that the supply current is greater than the threshold current or the cut-in voltage is opposite to the set voltage, and outputs the first level signal to the switch module, so that the switch module is disconnected, and the electrical connection between the supply terminal and the load is disconnected. If no overcurrent fault occurs in the circuit, the supply current is less than or equal to the threshold current detection, if no power supply is reversely connected, the access voltage is the same as the set voltage, the detection control module 10 generates a second level signal based on the detection result that the supply current is less than or equal to the threshold current and the access voltage is the same as the set voltage, and outputs the second level signal to the switch module so as to enable the switch module to be conducted, and the power supply end can continue to supply power to the load. The power supply circuit does not need to be connected with an anti-reflection diode in series, the power consumption of the anti-reflection diode is higher than that of a switch module (such as a triode), and the detection control module and the switch module can effectively reduce useless power consumption in the circuit.
In the embodiment of the disclosure, the output end of the detection control module is connected with the switch module, the switch module is electrically connected between the power supply end and the load, the detection control module is used for collecting the power supply current and the access voltage in the power supply circuit in real time, when the power supply current is larger than the threshold current, the circuit is determined to be overcurrent, when the polarity of the access voltage is opposite to that of the set voltage, the power supply is determined to be reversely connected, when any condition is met, the electric connection between the power supply end and the load is required to be disconnected, and the circuit is prevented from being damaged, so that the detection control module outputs a first level signal to the switch module to control the switch module to be disconnected. And when the power supply current is smaller than or equal to the threshold current and the access voltage is the same as the set voltage, generating a second level signal to control the switch module to be conducted. The power supply protection circuit provided by the embodiment of the disclosure not only can protect the circuit when the power supply circuit is in overcurrent, but also can protect the circuit when the circuit is reversely connected, so that the protection function of the circuit is increased, and meanwhile, an anti-reflection diode is not required to be arranged, so that the power consumption generated by the anti-reflection diode is reduced.
In some embodiments, the switch module is electrically connected between the positive supply terminal and the positive pole of the load; alternatively, the switch module is electrically connected between the negative supply terminal and the negative pole of the load.
Fig. 2 is a schematic structural diagram of still another power protection circuit according to an embodiment of the present disclosure, as shown in fig. 2, a switch module 20 is electrically connected between a positive power supply terminal and a positive electrode of a load, when the switch module 20 is turned on, a path is formed between the power supply terminal and the load, the power protection circuit forms a loop, when the circuit is over-current or current is reversed, the switch module 20 is disconnected, and the electrical connection between the positive power supply terminal and the positive electrode of the load is disconnected. Or, the switch module is electrically connected between the negative power supply end and the negative electrode of the load, as shown in fig. 3, the switch module 20 is electrically connected between the negative power supply end and the negative electrode of the load, and the power supply end and the load form a loop when the circuit works normally, so that the switch module 20 can be electrically connected between the negative power supply end and the negative electrode of the load, and once the circuit fails, the switch module 20 is disconnected, the nearby power supply end is disconnected from the negative electrode of the load, and the power supply loop is also disconnected.
In some embodiments, fig. 4 is a schematic structural diagram of still another power protection circuit according to an embodiment of the disclosure, and as shown in fig. 4, the detection control module includes an overcurrent detection unit 11, an anti-reverse connection detection unit 12, and a logic processing unit 13.
The detection end of the overcurrent detection unit 11 is electrically connected with a power supply loop of the power supply and is used for detecting the power supply current of the power supply. The detection end of the anti-reverse connection detection unit 12 is electrically connected with the power supply end and is used for detecting the access voltage of the power supply. The output end of the overcurrent detection unit 11 is electrically connected with the first input end of the logic processing unit 13, and the output end of the anti-reverse connection detection unit 12 is electrically connected with the second input end of the logic processing unit 13.
The logic processing unit 13 is configured to control on or off of the switch module 20 according to the detection result of the overcurrent detection unit 11 and the detection result of the anti-reverse connection detection unit 12.
In the embodiment of the disclosure, the detection control module includes an overcurrent detection unit 11 and an anti-reverse connection detection unit 12, where a detection end of the overcurrent detection unit 11 is electrically connected with a power supply loop of a power supply, and detects a power supply current of the power supply circuit, for example, a threshold current is set, when the power supply current is smaller than the threshold current, the circuit works normally, and when the power supply current is larger than the threshold current, it indicates that the power supply current is too large and exceeds a current in normal working, and an overcurrent fault occurs in the circuit. And the output terminal of the overcurrent detecting unit 11 is electrically connected to the first input terminal of the logic processing unit 13, and the overcurrent detecting unit 11 can input the detection result of the detected power supply current to the logic processing unit 13. The detection end of the reverse connection preventing detection unit 12 is electrically connected with the power supply end, and detects the connection voltage of the power supply, for example, the detection end is electrically connected with the negative power supply end, if the detected connection voltage is a negative value, the power supply is connected normally, and if the detected connection voltage is a positive value, the power supply is indicated to be reversely connected. And the output end of the anti-reverse connection detecting unit 12 is electrically connected with the second input end of the logic processing unit 13, and the anti-reverse connection detecting unit 12 can input the detection result of the detected access voltage to the logic processing unit 13.
In addition, the embodiment of the disclosure is further provided with a logic processing unit 13, an input end of the logic processing unit 13 is used for receiving a detection result of the overcurrent detection unit 11 and a detection result of the anti-reverse connection detection unit 12, an output end of the logic processing unit 13 is electrically connected with a control end of the switch module 20, and if the detection structure of the overcurrent detection unit 11 and the detection result of the anti-reverse connection detection unit 12 are normal, the logic processing unit 13 outputs a second level signal to control the switch module 20 to be turned on; if at least one of the detection structure of the overcurrent detection unit 11 and the detection result of the anti-reverse connection detection unit 12 is abnormal, the logic processing unit 13 outputs a first level signal to control the switch module 20 to be turned off.
In some embodiments, fig. 5 is a schematic structural diagram of still another power protection circuit according to an embodiment of the disclosure, and as shown in fig. 5, the overcurrent detection unit includes a detection resistor R1 and a signal acquisition chip 111.
The detection resistor R1 is connected in series between the power supply end and the load. The first end of the detection resistor R1 is further electrically connected with the first input end of the signal acquisition chip 111, and the second end of the detection resistor R1 is further electrically connected with the second input end of the signal acquisition chip 111. The output end of the signal acquisition chip 111 is electrically connected to the output end of the overcurrent detection unit.
The detection resistor R1 is connected in series between the power supply end and the load, the first end of the detection resistor R1 is respectively and electrically connected with the power supply end and the first input end of the signal acquisition chip 111, the second end of the detection resistor R1 is respectively and electrically connected with the load and the second input end of the signal acquisition chip 111, the signal acquisition chip 111 can acquire the pressure difference of the two ends of the detection resistor R1, and further power supply current is obtained, the signal acquisition chip 111 can also compare the power supply current with threshold current (the power supply current when the circuit is normal), if the power supply current is larger than the threshold current, the occurrence of overcurrent faults can be determined, and the output end of the signal acquisition chip 111 is electrically connected with the output end of the overcurrent detection unit, so that the signal acquisition chip 111 can output detection results from the output end.
It should be noted that, the signal acquisition chip may also be replaced by other signal acquisition circuits, for example, a circuit structure formed by multiple discrete components such as a power amplifier, a field effect transistor, etc., which is not limited in this embodiment of the disclosure.
In some embodiments, fig. 6 is a schematic structural diagram of a power protection circuit according to another embodiment of the disclosure, as shown in fig. 6, the anti-reverse connection detecting unit 12 includes a first switching element Q1, a control end of the first switching element Q1 is electrically connected to a detecting end of the anti-reverse connection detecting unit 12, a first end of the first switching element Q1 is electrically connected to the pull-up power VCC and an output end of the anti-reverse connection detecting unit 12, and a second end of the first switching element Q1 is grounded.
The control terminal of the first switching element Q1 is electrically connected to the detection terminal of the anti-reverse connection detection unit 12, and is configured to detect the access voltage of the power supply terminal. In fig. 6, the first switching element Q1 is illustratively a PNP triode, the control terminal of the first switching element Q1 is electrically connected to the negative electrode power supply terminal through the detection terminal of the anti-reverse connection detection unit 12, the first terminal of the first switching element Q1 is electrically connected to the pull-up power VCC and the output terminal of the detection unit 12, the second terminal of the first switching element Q1 is grounded, when the detected access voltage is negative, the first switching element Q1 is turned on, the output terminal of the anti-reverse connection detection unit 12 is pulled down, and a low level signal is output; when the detected access voltage is positive, the first switching element Q1 is turned off, the output end of the anti-reverse connection detecting unit 12 is the level of the pull-up power VCC, and a high level signal is output, so that whether the power supply is reverse connected can be determined according to the level signal output by the output end of the anti-reverse connection detecting unit 12. And the power consumption of the first switching element is much lower than that of the anti-reflection diode, so that the power consumption in the circuit can be reduced.
It should be noted that, in the embodiment of the present disclosure, other switching elements may be adopted, and whether the power supply is reversely connected may be determined according to the characteristics of the switching elements, which is only illustrated by way of example.
In some embodiments, with continued reference to fig. 6, the anti-reverse connection detection unit 12 further includes a pull-up resistor R2, a first end of the pull-up resistor R2 being connected between the first end of the first switching element Q1 and the output end of the anti-reverse connection detection unit 12; the second end of the pull-up resistor is electrically connected to a pull-up power supply VCC.
Through setting up pull-up resistor R2, avoid the circuit to have unstable condition when no control signal inserts, perhaps prevent that the signal line from appearing the uncertain state because of unsettled, then lead to the system to appear unexpected state, clamp the signal of uncertainty at high level through pull-up resistor, ensure the stability of circuit.
In some embodiments, fig. 7 is a schematic diagram of a structure of a power protection circuit according to an embodiment of the disclosure, where, as shown in fig. 7, the logic processing unit 13 includes an or gate 131, a first input terminal of the or gate 131 is electrically connected to a first input terminal of the logic processing unit 13, a second input terminal of the or gate 131 is electrically connected to a second input terminal of the logic processing unit 13, and an output terminal of the or gate 131 is electrically connected to an output terminal of the logic processing unit 13.
The logic processing unit 13 includes an or gate 131, where the or gate 131 includes a first input end and a second input end, and the first input end is electrically connected to the first input end of the logic processing unit 13 and used for receiving the detection result of the overcurrent detection unit 11, and the second input end is electrically connected to the second input end of the logic processing unit 13 and used for receiving the detection result of the anti-reverse connection detection unit 12. When the power supply circuit does not flow excessively (the power supply current is less than or equal to the threshold current) and the power supply is not connected reversely (the access voltage is the same as the set voltage), the or gate 131 outputs a level signal for controlling the switch module to be turned on. If any one of the power supply circuits does not meet the requirement, the or gate 131 outputs a level signal for controlling the switch module to be turned off, for example, the power supply current is greater than the threshold current but the access voltage is the same as the set voltage, at this time, the power supply circuit is overcurrent but the power supply is not reversely connected, and the or gate 131 outputs a level signal for controlling the switch module to be turned off; or the power supply current is smaller than or equal to the threshold current but the access voltage is opposite to the set voltage, at this time, the power supply circuit is normal but the power supply is reversely connected, and the or gate 131 also outputs a level signal for controlling the switch module to be disconnected; if the power supply current is larger than the threshold current and the access voltage is opposite to the set voltage, the power supply circuit is overcurrent and the power supply source is reversely connected, the level signal for controlling the switch module to be disconnected is also output, the power supply end and the load are disconnected in time, and the circuit is prevented from being damaged.
In some embodiments, the detection end of the anti-reverse connection detection unit is electrically connected with the positive electrode power supply end; or the detection end of the reverse connection prevention detection unit is electrically connected with the negative electrode power supply end.
In the embodiment of the disclosure, the detection end of the anti-reverse connection detection unit may be electrically connected with the positive electrode power supply end, and at this time, the set voltage is a positive value, if the access voltage is a negative value, the reverse connection of the power supply can be determined, and if the access voltage is a positive value, the normal connection of the power supply is determined. Or the detection end of the reverse connection prevention detection unit is electrically connected with the negative electrode power supply end, the voltage is set to be negative, the reverse connection of the power supply can be determined if the access voltage is positive, and the normal connection of the power supply can be determined if the access voltage is negative.
In some embodiments, fig. 8 is a schematic structural diagram of still another power protection circuit according to an embodiment of the disclosure, as shown in fig. 8, the switch module 20 includes a second switch element Q2, a control end of the second switch element Q2 is electrically connected to a control end of the switch module 20, a first end of the second switch element Q2 is electrically connected to a first end of the switch module 20, and a second end of the second switch element Q2 is electrically connected to a second end of the switch module 20.
The switch module 20 includes a second switch element Q2, illustratively, the second switch element Q2 is configured as a PMOS tube, a control end of the second switch element Q2 is electrically connected to a control end of the switch module 20, and receives a level signal sent by an output end of the detection control module 10, if a low level signal is sent, the second switch element Q2 is disconnected, and a first end of the second switch element Q2 is electrically connected to a first end of the switch module 20, and a second end of the second switch element Q2 is electrically connected to a second end of the switch module 20, that is, the second switch element Q2 is connected between a power supply end and a load, and if the second switch element Q2 is disconnected, the connection between the power supply end and the load is disconnected. If a high level signal is sent, if the second switching element Q2 is conducted, the power supply end is conducted with the load, and the circuit operates normally.
It should be noted that other switching elements may be adopted in the embodiments of the present disclosure, and the switching module may be determined to be turned off or turned on according to the characteristics of the switching element, which is only illustrated by way of example.
As shown in fig. 9, in the embodiment of the disclosure, the detection control module provided includes an overcurrent detection unit 11, an anti-reverse connection detection unit 12, a logic processing unit 13, and a switch module 20, and the current of the positive power supply end sequentially passes through a detection resistor R1, a second switching element Q2 (PMOS tube) of the switch module 20, and reaches the positive electrode of the load, and the negative electrode of the load is connected with the negative power supply end, so as to form a power supply loop. The signal acquisition chip 111 acquires the voltage difference between two ends of the detection resistor R1 in real time, compares the obtained detection current with a threshold current, determines that the circuit is overcurrent if the detection current is greater than the threshold current, and outputs a low-level signal to a first input end of the OR gate 131 of the logic processing unit 13; the first switching element Q1 (PNP triode) in the anti-reverse connection detection unit 12 is connected to the negative supply terminal, the set voltage should be negative, the access voltage of the power supply is detected, if the access voltage is the same as the set voltage, the first switching element Q1 is turned on, and a low level is output to the second input terminal of the or gate 131 of the logic processing unit 13, at this time, the or gate 131 outputs a low level, the second switching element Q2 is turned on, and the power supply terminal is electrically connected to the load. If any one of the input terminals of the or gate 131 inputs a high level, the or gate 131 outputs a high level, and the second switching element Q2 is turned off, so that the connection between the power supply terminal and the load is disconnected, and the circuit safety is ensured.
The embodiment of the disclosure also provides a vehicle, which comprises the power supply protection circuit in any embodiment. The power supply protection circuit in any of the embodiments has the same or corresponding advantages as those of the power supply protection circuit in each of the embodiments. It should be noted that, the vehicle provided in the embodiment of the present utility model may further include other circuits and devices for supporting the normal operation of the vehicle, which is not limited in this embodiment.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power supply protection circuit, comprising: the detection control module and the switch module;
the switch module is electrically connected between the power supply end and the load;
the detection control module is respectively and electrically connected with the power supply end and the switch module, and is used for detecting the power supply current of the power supply and the access voltage of the power supply;
the detection control module generates a first level signal based on a detection result that the power supply current is larger than the threshold current or the access voltage is opposite to the set voltage, and outputs the first level signal to the switch module so as to disconnect the switch module;
and the detection control module generates a second level signal based on the detection result that the power supply current is smaller than or equal to the threshold current and the access voltage is the same as the set voltage, and outputs the second level signal to the switch module so as to conduct the switch module.
2. The power protection circuit of claim 1, wherein the switch module is electrically connected between a positive supply terminal and a positive pole of a load; alternatively, the switch module is electrically connected between the negative supply terminal and the negative pole of the load.
3. The power protection circuit of claim 1, wherein the detection control module comprises an overcurrent detection unit, an anti-reverse detection unit, and a logic processing unit;
the detection end of the overcurrent detection unit is electrically connected with a power supply loop of the power supply and is used for detecting the power supply current of the power supply; the detection end of the reverse connection prevention detection unit is electrically connected with the power supply end and is used for detecting the access voltage of the power supply; the output end of the overcurrent detection unit is electrically connected with the first input end of the logic processing unit; the output end of the reverse connection preventing detection unit is electrically connected with the second input end of the logic processing unit;
the logic processing unit is used for controlling the on/off of the switch module according to the detection result of the overcurrent detection unit and the detection result of the reverse connection prevention detection unit.
4. The power protection circuit of claim 3, wherein the overcurrent detection unit comprises a detection resistor and a signal acquisition chip;
the detection resistor is connected in series between the power supply end and the load; the first end of the detection resistor is also electrically connected with the first input end of the signal acquisition chip; the second end of the detection resistor is also electrically connected with the second input end of the signal acquisition chip; the output end of the signal acquisition chip is electrically connected with the output end of the overcurrent detection unit; the signal acquisition chip is used for acquiring access voltages generated at two ends of the detection resistor and comparing the access voltages with set voltages.
5. A power supply protection circuit according to claim 3, wherein the anti-reverse connection detection unit includes a first switching element, a control terminal of which is electrically connected to a detection terminal of the anti-reverse connection detection unit; the first end of the first switch element is electrically connected with the pull-up power supply and the output end of the reverse connection preventing detection unit respectively; the second end of the first switching element is grounded.
6. The power protection circuit according to claim 5, wherein the anti-reverse connection detection unit further comprises a pull-up resistor, a first end of the pull-up resistor being connected between the first end of the first switching element and an output end of the anti-reverse connection detection unit; the second end of the pull-up resistor is electrically connected with the pull-up power supply.
7. A power protection circuit according to claim 3, wherein the logic processing unit comprises an or gate, a first input of the or gate being electrically connected to a first input of the logic processing unit; the second input end of the OR gate is electrically connected with the second input end of the logic processing unit; the output end of the OR gate is electrically connected with the output end of the logic processing unit; the OR gate is used for generating a first level signal or a second level signal and outputting the first level signal or the second level signal to the switch module to control the on and off of the switch module.
8. The power supply protection circuit according to claim 3, wherein the detection end of the reverse connection prevention detection unit is electrically connected with the positive electrode power supply end; or the detection end of the reverse connection prevention detection unit is electrically connected with the negative electrode power supply end.
9. The power protection circuit of claim 1, wherein the switching module comprises a second switching element, a control terminal of the second switching element being electrically connected to a control terminal of the switching module; a first end of the second switching element is electrically connected with a first end of the switching module; a second end of the second switching element is electrically connected with a second end of the switching module; the second switching element is used for switching on or switching off the connection between the power supply end and the load according to the first level signal or the second level signal.
10. A vehicle comprising a power supply protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321510115.6U CN219892960U (en) | 2023-06-13 | 2023-06-13 | Power supply protection circuit and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321510115.6U CN219892960U (en) | 2023-06-13 | 2023-06-13 | Power supply protection circuit and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219892960U true CN219892960U (en) | 2023-10-24 |
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ID=88401801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321510115.6U Active CN219892960U (en) | 2023-06-13 | 2023-06-13 | Power supply protection circuit and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219892960U (en) |
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2023
- 2023-06-13 CN CN202321510115.6U patent/CN219892960U/en active Active
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