CN216290244U - Charging and discharging MOS tube overcurrent self-recovery protection circuit and power supply - Google Patents
Charging and discharging MOS tube overcurrent self-recovery protection circuit and power supply Download PDFInfo
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- CN216290244U CN216290244U CN202122325968.XU CN202122325968U CN216290244U CN 216290244 U CN216290244 U CN 216290244U CN 202122325968 U CN202122325968 U CN 202122325968U CN 216290244 U CN216290244 U CN 216290244U
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Abstract
The utility model relates to the technical field of battery management, and provides a charging and discharging MOS tube overcurrent self-recovery protection circuit and a power supply, wherein a switching device is arranged in a charging and discharging loop of a battery; the above circuit includes: the device comprises a current detection module, a comparison module and a switch control module; the current detection module is connected in series in a charge-discharge loop of the battery through a first end of the current detection module and a second end of the current detection module, and a third end of the current detection module is connected with the input end of the comparison module; the output end of the comparison module is connected with the input end of the switch control module, and the output end of the switch control module is connected with the control end of the switch device. The utility model detects the current flowing through the charge-discharge loop, judges the current through the comparison module, further controls the on-off of the charge-discharge loop, is completely realized by hardware and has high response speed.
Description
Technical Field
The utility model belongs to the technical field of battery management, and particularly relates to an over-current self-recovery protection circuit and a power supply for a charge-discharge MOS (metal oxide semiconductor) tube.
Background
The electric tool generally has larger power and long continuous discharge time, and generally does not adopt a lithium battery due to the influence of performance and cost. However, with the continuous development of new technologies and cost reduction of power lithium ion batteries, lithium ion batteries are more and more widely applied to portable electric tools.
In the prior art, a charge and discharge MOS is generally disposed in a charge and discharge loop of a lithium ion battery, and is used for controlling charge and discharge of the lithium ion battery. For low power devices, an integrated battery management chip is typically employed, with over-current detection implemented by software. Due to the fact that the power of the electric tool is large, the overcurrent detection is carried out for too long response time by adopting the scheme, and accidents are easily caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides an overcurrent self-recovery protection circuit and a power supply for a charge and discharge MOS transistor, so as to solve the problem in the prior art that a battery management chip is used for overcurrent detection and the response time is too long in a high-power electric tool battery.
The embodiment of the utility model provides a charging and discharging MOS tube overcurrent self-recovery protection circuit, wherein a charging and discharging loop of a battery is provided with a switch device; the charge-discharge MOS tube overcurrent self-recovery protection circuit comprises: the device comprises a current detection module, a comparison module and a switch control module;
the current detection module is connected in series in a charge-discharge loop of the battery through a first end of the current detection module and a second end of the current detection module, and a third end of the current detection module is connected with the input end of the comparison module;
the output end of the comparison module is connected with the input end of the switch control module, and the output end of the switch control module is connected with the control end of the switch device.
Optionally, the switch control module includes: a first switch unit, a second switch unit and a third switch unit;
the first end of the first switch unit is connected with the control end of the second switch unit, the second end of the first switch unit is grounded, and the control end of the first switch unit is connected with the input end of the switch control module;
the first end of the second switch unit is connected with the anode of the battery, and the second end of the second switch unit is connected with the control end of the third switch unit;
the first end of the third switching unit is connected with the output end of the switch control module, and the second end of the third switching unit is grounded.
Optionally, the first switching unit includes: the circuit comprises a first switch tube, a second switch tube, a first resistor, a second resistor and a third resistor;
the first end of the first switch tube is connected with an internal power supply end, the second end of the first switch tube is connected with the first end of the first resistor, and the control end of the first switch tube is connected with the control end of the first switch unit;
the first end of the second switch tube is connected with the first end of the first switch unit through a third resistor, the second end of the second switch tube is connected with the second end of the first switch unit, and the control end of the second switch tube is respectively connected with the second end of the first resistor and the first end of the second resistor;
the second end of the second resistor is grounded.
Optionally, the second switching unit includes: a third switch tube and a fourth resistor;
the first end of the third switch tube is respectively connected with the first end of the fourth resistor and the first end of the second switch unit, the second end of the third switch tube is connected with the second end of the second switch unit, and the control end of the third switch tube is respectively connected with the second end of the fourth resistor and the control end of the second switch unit.
Optionally, the third switching unit includes: the fourth switching tube, the fifth resistor, the sixth resistor and the first capacitor;
the first end of the fourth switching tube is connected with the first end of the fifth switching tube and the first end of the third switching unit, the second end of the fourth switching tube is connected with the control end of the fifth switching tube, and the control end of the fourth switching tube is respectively connected with the first end of the fifth resistor and the first end of the sixth resistor;
the first end of the first capacitor is respectively connected with the control end of the third switch unit and the second end of the fifth resistor, and the second end of the first capacitor is grounded;
the second end of the fifth switch tube and the second end of the sixth resistor are both grounded.
Optionally, the switching device includes: the MOS transistor comprises a first MOS transistor and a second MOS transistor; the charge and discharge MOS pipe overcurrent self-recovery protection circuit further comprises: a shunt module;
the input end of the shunt module is connected with the output end of the switch control module, the first output end of the shunt module is connected with the grid electrode of the first MOS tube, and the second output end of the shunt module is connected with the grid electrode of the second MOS tube.
Optionally, the comparing module includes: the circuit comprises a first operational amplifier, a second capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor;
a first input end of the first operational amplifier is respectively connected with a first end of the eighth resistor and a first end of the ninth resistor, a second input end of the first operational amplifier is respectively connected with a first end of the seventh resistor and a first end of the second capacitor, and an output end of the first operational amplifier is respectively connected with a first end of the tenth resistor and a first end of the eleventh resistor;
the second end of the seventh resistor is connected with the input end of the comparison module; the second end of the eleventh resistor is connected with the output end of the comparison module;
the second end of the ninth resistor and the second end of the tenth resistor are both connected with an internal power supply end;
the second end of the second capacitor and the second end of the eighth resistor are both grounded.
Optionally, the current detection module includes: a second operational amplifier, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor and an eighteenth resistor;
a first input end of the second operational amplifier is respectively connected with a first end of the eighteenth resistor and a first end of the thirteenth resistor, a second input end of the second operational amplifier is respectively connected with a first end of the sixteenth resistor and a first end of the seventeenth resistor, and an output end of the second operational amplifier is respectively connected with a second end of the thirteenth resistor and a third end of the current detection module;
a second end of the sixteenth resistor is connected with a first end of the fourteenth resistor and a first end of the fifteenth resistor respectively;
the second end of the eighteenth resistor is respectively connected with the first end of the twelfth resistor and the first end of the current detection module;
a second end of the seventeenth resistor is connected with a second end of the twelfth resistor and a second end of the current detection module respectively;
a second end of the fourteenth resistor is connected with the internal power supply end; a second end of the fifteenth resistor is connected to ground.
Optionally, the current detection module further includes: a third capacitor, a fourth capacitor, a fifth capacitor, a nineteenth resistor and a twentieth resistor;
a first end of the nineteenth resistor is connected with a first end of the twelfth resistor and a first end of the current detection module respectively, and a second end of the nineteenth resistor is connected with a first end of the third capacitor, a first end of the fourth capacitor and a second end of the eighteenth resistor respectively;
a first end of the twentieth resistor is connected with a second end of the twelfth resistor and a second end of the current detection module respectively, and a second end of the twentieth resistor is connected with a second end of the fourth capacitor, a first end of the fifth capacitor and a second end of the seventeenth resistor respectively;
the second end of the third capacitor and the second end of the fifth capacitor are both grounded.
A second aspect of the embodiments of the present invention provides a power supply, including any one of the charge and discharge MOS transistor overcurrent self-recovery protection circuits in the first aspect of the embodiments of the present invention.
The embodiment of the utility model provides a charging and discharging MOS tube overcurrent self-recovery protection circuit and a power supply, wherein a switch device is arranged in a charging and discharging loop of a battery; the above circuit includes: the device comprises a current detection module, a comparison module and a switch control module; the current detection module is connected in series in a charge-discharge loop of the battery through a first end of the current detection module and a second end of the current detection module, and a third end of the current detection module is connected with the input end of the comparison module; the output end of the comparison module is connected with the input end of the switch control module, and the output end of the switch control module is connected with the control end of the switch device. The embodiment of the utility model detects the current flowing through the charge-discharge loop, judges the current through the comparison module, further controls the on-off of the charge-discharge loop, is completely realized by hardware and has high response speed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit structure diagram of an overcurrent self-recovery protection circuit for a charge and discharge MOS transistor according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a switch control module according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a shunting module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a comparison module according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a current detection module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the utility model. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, an embodiment of the present invention provides an overcurrent self-recovery protection circuit for a charge/discharge MOS transistor, in which a switch device 4 is disposed in a charge/discharge loop of a battery BAT; charge and discharge MOS pipe overcurrent self-resuming protection circuit includes: the device comprises a current detection module 1, a comparison module 2 and a switch control module 3;
the current detection module 1 is connected in series in a charge-discharge loop of the battery BAT through a first end of the current detection module 1 and a second end of the current detection module 1, and a third end of the current detection module 1 is connected with an input end of the comparison module 2;
the output end of the comparison module 2 is connected with the input end of the switch control module 3, and the output end of the switch control module 3 is connected with the control end of the switch device 4.
Referring to fig. 1, a switching device 4 is provided in a charge and discharge circuit of the battery BAT for controlling charge and discharge of the battery BAT. In the embodiment of the utility model, the current flowing through the charge-discharge loop is detected by the current detection module 1, the detected current signal is sent to the comparison module 2, the comparison module 2 detects the current signal, when the current signal is detected to be larger than the preset current value, the overcurrent signal is sent to the switch control module 3, and the switch control module 3 controls the switch device 4 to be disconnected according to the overcurrent signal so as to cut off the charge-discharge loop of the battery BAT. The embodiment of the utility model carries out overcurrent protection through hardware, has high response speed, and can cut off the battery charge-discharge loop in time when overcurrent occurs, thereby preventing the battery BAT and electric equipment from being damaged by overcurrent and avoiding accidents.
In some embodiments, referring to fig. 2, the switch control module 3 may include: a first switching unit 31, a second switching unit 32, and a third switching unit 33;
a first end of the first switch unit 31 is connected with a control end of the second switch unit 32, a second end of the first switch unit 31 is grounded, and a control end of the first switch unit 31 is connected with an input end of the switch control module 3;
a first terminal of the second switching unit 32 is connected to a positive electrode B + of the battery BAT, and a second terminal of the second switching unit 32 is connected to a control terminal of the third switching unit 33;
a first end of the third switching unit 33 is connected to the output end of the switch control module 3, and a second end of the third switching unit 33 is grounded.
In the embodiment of the utility model, the three switch units process the level signals output by the comparison module 2 so as to meet the control level requirement of the switch device 4 and improve the stability of the circuit.
In some embodiments, referring to fig. 2, the first switching unit 31 may include: the circuit comprises a first switch tube Q1, a second switch tube Q2, a first resistor R1, a second resistor R2 and a third resistor R3.
A first end of the first switch tube Q1 is connected to the internal power supply terminal VCC, a second end of the first switch tube Q1 is connected to a first end of the first resistor R1, and a control end of the first switch tube Q1 is connected to a control end of the first switch unit 31;
a first end of a second switching tube Q2 is connected to the first end of the first switching unit 31 through a third resistor R3, a second end of the second switching tube Q2 is connected to the second end of the first switching unit 31, and a control end of the second switching tube Q2 is connected to the second end of the first resistor R1 and the first end of the second resistor R2, respectively;
the second terminal of the second resistor R2 is connected to ground.
In some embodiments, the first switch Q1 may be a PNP transistor, and the second switch Q2 may be an NPN transistor.
In some embodiments, referring to fig. 2, the second switching unit 32 may include: a third switch tube Q3 and a fourth resistor R4.
A first end of the third switching tube Q3 is connected to a first end of the fourth resistor R4 and a first end of the second switching unit 32, respectively, a second end of the third switching tube Q3 is connected to a second end of the second switching unit 32, and a control end of the third switching tube Q3 is connected to a second end of the fourth resistor R4 and a control end of the second switching unit 32, respectively.
In some embodiments, the third switching transistor Q3 may be a PNP transistor.
In some embodiments, referring to fig. 2, the third switching unit 33 may include: a fourth switching tube Q4, a fifth switching tube Q5, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1;
a first end of a fourth switching tube Q4 is connected with a first end of a fifth switching tube Q5 and a first end of a third switching unit 33, a second end of a fourth switching tube Q4 is connected with a control end of the fifth switching tube Q5, and a control end of a fourth switching tube Q4 is connected with a first end of a fifth resistor R5 and a first end of a sixth resistor R6 respectively;
a first end of the first capacitor C1 is connected to the control end of the third switching unit 33 and a second end of the fifth resistor R5, respectively, and a second end of the first capacitor C1 is grounded;
the second terminal of the fifth switch Q5 and the second terminal of the sixth resistor R6 are both grounded.
In some embodiments, the fourth switching transistor Q4 and the fifth switching transistor Q5 may be NPN transistors.
Referring to fig. 2, in the embodiment of the present invention, when the control terminal of the first switching unit 31 inputs a high level, the first switching tube Q1, the second switching tube Q2 are turned off, the third switching tube Q3, the fourth switching tube Q4 and the fifth switching tube Q5 are all turned off, and the switching device 4 is controlled by the battery BAT management circuit to perform normal charging and discharging control.
When the control end of the first switch unit 31 inputs a low level, the first switch tube Q1, the second switch tube Q2 are turned off, the third switch tube Q3, the fourth switch tube Q4 and the fifth switch tube Q5 are all turned on, the level of the output end of the switch control module 3 is pulled down, the control switch device 4 is turned off, the battery BAT is subjected to overcurrent protection, and charging and discharging are stopped.
In some embodiments, referring to fig. 3, the switching device 4 may include: a first MOS transistor Q6 and a second MOS transistor Q7; battery BAT overcurrent protection circuit still includes: a shunt module;
the input end of the shunt module is connected with the output end of the switch control module 3, the first output end of the shunt module is connected with the gate of the first MOS transistor Q6, and the second output end of the shunt module is connected with the gate of the second MOS transistor Q7.
In some embodiments, the first MOS transistor Q6 and the second MOS transistor Q7 may both be NMOS.
Referring to fig. 3, the bifurcating module may include: a twenty-first resistor R21 and a twenty-second resistor R22.
The first end of the twenty-first resistor R21 is connected with the input end of the shunt module, and the second end of the twenty-first resistor R21 is connected with the first output end of the shunt module;
a first terminal of a twenty-second resistor R22 is connected to the input terminal of the shunt module and a second terminal of the twenty-second resistor R22 is connected to the second output terminal of the shunt module.
The first MOS tube Q6 and the second MOS tube Q7 are respectively used for controlling charging and discharging of the battery BAT, and the shunt module is used for dividing the control signal into two paths and controlling the two MOS tubes, so that charging and discharging can be stopped in time when the charging current or the discharging current is too large.
In some embodiments, referring to fig. 4, the comparison module 2 may include: the circuit comprises a first operational amplifier U1, a second capacitor C2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11.
A first input end of the first operational amplifier U1 is connected with a first end of the eighth resistor R8 and a first end of the ninth resistor R9, respectively, a second input end of the first operational amplifier U1 is connected with a first end of the seventh resistor R7 and a first end of the second capacitor C2, respectively, and an output end of the first operational amplifier U1 is connected with a first end of the tenth resistor R10 and a first end of the eleventh resistor R11, respectively;
the second end of the seventh resistor R7 is connected with the input end of the comparison module 2; a second end of the eleventh resistor R11 is connected with the output end of the comparison module 2;
a second end of the ninth resistor R9 and a second end of the tenth resistor R10 are both connected to the internal power supply terminal VCC;
the second terminal of the second capacitor C2 and the second terminal of the eighth resistor R8 are both grounded.
In some embodiments, the first input terminal of the first operational amplifier U1 may be a positive input terminal of the first operational amplifier U1, and the second input terminal may be a negative input terminal.
In the embodiment of the utility model, R8 and R9 are used to provide a reference voltage, and when the input voltage of the comparison module 2 is less than the reference voltage, the first operational amplifier U1 outputs a high level; when the input voltage of the comparing module 2 is not less than the reference voltage, the first operational amplifier U1 outputs a low level. The current detection module 1 converts the detected current flowing through the charge-discharge loop into a voltage value to be compared with a reference voltage, and determines whether the current is over-current. Wherein, the reference voltage is determined according to the preset current value, and the reference voltage can be adjusted through R8 and R9.
In some embodiments, referring to fig. 5, the current detection module 1 may include: the circuit comprises a second operational amplifier U2, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18.
A first input end of a second operational amplifier U2 is respectively connected with a first end of an eighteenth resistor R18 and a first end of a thirteenth resistor R13, a second input end of the second operational amplifier U2 is respectively connected with a first end of a sixteenth resistor R16 and a first end of a seventeenth resistor R17, and an output end of the second operational amplifier U2 is respectively connected with a second end of the thirteenth resistor R13 and a third end of the current detection module 1;
a second end of the sixteenth resistor R16 is connected to a first end of the fourteenth resistor R14 and a first end of the fifteenth resistor R15, respectively;
a second end of the eighteenth resistor R18 is connected to the first end of the twelfth resistor R12 and the first end of the current detection module 1, respectively;
a second end of the seventeenth resistor R17 is connected to a second end of the twelfth resistor R12 and a second end of the current detection module 1, respectively;
a second terminal of the fourteenth resistor R14 is connected to the internal power supply terminal VCC; a second terminal of the fifteenth resistor R15 is connected to ground.
In some embodiments, the first input terminal of the second operational amplifier U2 may be a negative input terminal of the second operational amplifier U2, and the second input terminal is a positive input terminal.
In the embodiment of the utility model, when the battery BAT is charged and discharged, current flows through the twelfth resistor R12, and a voltage difference is generated at two ends of the twelfth resistor R12, and the voltage difference reflects the magnitude of the current. The voltage difference is input into a second operational amplifier U2, amplified by preset times through a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18, and then output to the comparison module 2 for comparison, so as to determine whether overcurrent exists.
In some embodiments, referring to fig. 5, the current detection module 1 may further include: a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a nineteenth resistor R19, and a twentieth resistor R20.
A first end of a nineteenth resistor R19 is connected to a first end of the twelfth resistor R12 and a first end of the current detection module 1, respectively, and a second end of a nineteenth resistor R19 is connected to a first end of the third capacitor C3, a first end of the fourth capacitor C4, and a second end of the eighteenth resistor R18, respectively;
a first end of the twentieth resistor R20 is connected to the second end of the twelfth resistor R12 and the second end of the current detection module 1, respectively, and a second end of the twentieth resistor R20 is connected to the second end of the fourth capacitor C4, the first end of the fifth capacitor C5, and the second end of the seventeenth resistor R17, respectively;
the second terminal of the third capacitor C3 and the second terminal of the fifth capacitor C5 are both grounded.
The embodiment of the utility model is also provided with a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5 for filtering, thereby preventing signal interference and improving the accuracy of the circuit.
The above circuit is described in detail with reference to specific embodiments.
Refer to fig. 2, 3, 4 and 5.
When the battery BAT is charged and discharged, but the charging and discharging current does not exceed the preset current value, a very small voltage difference is generated at two ends of the twelfth resistor R12, the current detection module 1 amplifies the voltage difference and then outputs a small voltage signal to the negative input end of the first operational amplifier U1, the positive input end voltage of the first operational amplifier U1 is greater than that of the negative input end voltage, the first operational amplifier U1 outputs a high level, each switching tube in the switch control module 3 is disconnected, the overcurrent protection function is not triggered, and the battery BAT is charged and discharged normally;
when the charging and discharging current is larger than a preset current value, the voltage difference between two ends of the twelfth resistor R12 is increased, the voltage of the negative input end of the first operational amplifier U1 is larger than the voltage of the positive input end, the first operational amplifier U1 outputs a low level, each switch tube in the switch control module 3 is turned on, the output end of the switch control module 3 is pulled down, the low level is output, the first MOS tube Q6 and the second MOS tube Q7 are controlled to be turned off, the overcurrent protection function is triggered, and the battery BAT cannot be charged and discharged normally;
when the overcurrent problem disappears and the current in the battery BAT charge-discharge loop is smaller than the preset current value, the overcurrent protection is released, and the battery BAT resumes normal charge-discharge.
Corresponding to any one of the above charging and discharging MOS transistor overcurrent self-recovery protection circuits, an embodiment of the present invention further provides a power supply, where the power supply includes any one of the above charging and discharging MOS transistor overcurrent self-recovery protection circuits, and has advantages of the above charging and discharging MOS transistor overcurrent self-recovery protection circuits, and details are not repeated here.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A charging and discharging MOS tube overcurrent self-recovery protection circuit is characterized in that a charging and discharging loop of a battery is provided with a switch device; the charge and discharge MOS tube overcurrent self-recovery protection circuit comprises: the device comprises a current detection module, a comparison module and a switch control module;
the current detection module is connected in a charge-discharge loop of the battery in series through a first end of the current detection module and a second end of the current detection module, and a third end of the current detection module is connected with the input end of the comparison module;
the output end of the comparison module is connected with the input end of the switch control module, and the output end of the switch control module is connected with the control end of the switch device.
2. The charging and discharging MOS tube overcurrent self-recovery protection circuit of claim 1, wherein the switch control module comprises: a first switch unit, a second switch unit and a third switch unit;
the first end of the first switch unit is connected with the control end of the second switch unit, the second end of the first switch unit is grounded, and the control end of the first switch unit is connected with the input end of the switch control module;
a first end of the second switch unit is connected with the positive electrode of the battery, and a second end of the second switch unit is connected with a control end of the third switch unit;
the first end of the third switching unit is connected with the output end of the switch control module, and the second end of the third switching unit is grounded.
3. The charging and discharging MOS tube overcurrent self-recovery protection circuit of claim 2, wherein the first switch unit comprises: the circuit comprises a first switch tube, a second switch tube, a first resistor, a second resistor and a third resistor;
the first end of the first switch tube is connected with an internal power supply end, the second end of the first switch tube is connected with the first end of the first resistor, and the control end of the first switch tube is connected with the control end of the first switch unit;
the first end of the second switch tube is connected with the first end of the first switch unit through the third resistor, the second end of the second switch tube is connected with the second end of the first switch unit, and the control end of the second switch tube is respectively connected with the second end of the first resistor and the first end of the second resistor;
and the second end of the second resistor is grounded.
4. The charging and discharging MOS tube overcurrent self-recovery protection circuit of claim 2, wherein the second switch unit comprises: a third switch tube and a fourth resistor;
the first end of the third switch tube is connected with the first end of the fourth resistor and the first end of the second switch unit respectively, the second end of the third switch tube is connected with the second end of the second switch unit, and the control end of the third switch tube is connected with the second end of the fourth resistor and the control end of the second switch unit respectively.
5. The charging and discharging MOS tube overcurrent self-recovery protection circuit of claim 2, wherein the third switch unit comprises: the fourth switching tube, the fifth resistor, the sixth resistor and the first capacitor;
a first end of the fourth switching tube is connected with a first end of the fifth switching tube and a first end of the third switching unit, a second end of the fourth switching tube is connected with a control end of the fifth switching tube, and the control end of the fourth switching tube is respectively connected with a first end of the fifth resistor and a first end of the sixth resistor;
a first end of the first capacitor is connected with a control end of the third switching unit and a second end of the fifth resistor respectively, and a second end of the first capacitor is grounded;
and the second end of the fifth switching tube and the second end of the sixth resistor are both grounded.
6. The charging and discharging MOS tube overcurrent self-recovery protection circuit according to any one of claims 1 to 5, wherein the switching device comprises: the MOS transistor comprises a first MOS transistor and a second MOS transistor; the charge and discharge MOS tube overcurrent self-recovery protection circuit further comprises: a shunt module;
the input end of the shunt module is connected with the output end of the switch control module, the first output end of the shunt module is connected with the grid electrode of the first MOS tube, and the second output end of the shunt module is connected with the grid electrode of the second MOS tube.
7. The charging and discharging MOS tube overcurrent self-recovery protection circuit as claimed in any one of claims 1 to 5, wherein the comparison module comprises: the circuit comprises a first operational amplifier, a second capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor;
a first input end of the first operational amplifier is connected with a first end of the eighth resistor and a first end of the ninth resistor respectively, a second input end of the first operational amplifier is connected with a first end of the seventh resistor and a first end of the second capacitor respectively, and an output end of the first operational amplifier is connected with a first end of the tenth resistor and a first end of the eleventh resistor respectively;
the second end of the seventh resistor is connected with the input end of the comparison module; the second end of the eleventh resistor is connected with the output end of the comparison module;
a second end of the ninth resistor and a second end of the tenth resistor are both connected with an internal power supply end;
and the second end of the second capacitor and the second end of the eighth resistor are both grounded.
8. The charging and discharging MOS tube overcurrent self-recovery protection circuit as claimed in any one of claims 1 to 5, wherein the current detection module comprises: a second operational amplifier, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor and an eighteenth resistor;
a first input end of the second operational amplifier is respectively connected with a first end of the eighteenth resistor and a first end of the thirteenth resistor, a second input end of the second operational amplifier is respectively connected with a first end of the sixteenth resistor and a first end of the seventeenth resistor, and an output end of the second operational amplifier is respectively connected with a second end of the thirteenth resistor and a third end of the current detection module;
a second end of the sixteenth resistor is connected with a first end of the fourteenth resistor and a first end of the fifteenth resistor respectively;
a second end of the eighteenth resistor is connected with a first end of the twelfth resistor and a first end of the current detection module respectively;
a second end of the seventeenth resistor is connected with a second end of the twelfth resistor and a second end of the current detection module respectively;
a second end of the fourteenth resistor is connected with an internal power supply end; a second end of the fifteenth resistor is connected to ground.
9. The charging and discharging MOS transistor overcurrent self-recovery protection circuit of claim 8, wherein the current detection module further comprises: a third capacitor, a fourth capacitor, a fifth capacitor, a nineteenth resistor and a twentieth resistor;
a first end of the nineteenth resistor is connected with a first end of the twelfth resistor and a first end of the current detection module respectively, and a second end of the nineteenth resistor is connected with a first end of the third capacitor, a first end of the fourth capacitor and a second end of the eighteenth resistor respectively;
a first end of the twentieth resistor is connected to the second end of the twelfth resistor and the second end of the current detection module respectively, and a second end of the twentieth resistor is connected to the second end of the fourth capacitor, the first end of the fifth capacitor and the second end of the seventeenth resistor respectively;
and the second end of the third capacitor and the second end of the fifth capacitor are both grounded.
10. A power supply, characterized by comprising the charging and discharging MOS transistor overcurrent self-recovery protection circuit of any one of claims 1 to 9.
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|---|---|---|---|
| CN202122325968.XU CN216290244U (en) | 2021-09-24 | 2021-09-24 | Charging and discharging MOS tube overcurrent self-recovery protection circuit and power supply |
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| CN202122325968.XU CN216290244U (en) | 2021-09-24 | 2021-09-24 | Charging and discharging MOS tube overcurrent self-recovery protection circuit and power supply |
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