CN113410817B - Short-circuit protection circuit, device with circuit and method - Google Patents
Short-circuit protection circuit, device with circuit and method Download PDFInfo
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- CN113410817B CN113410817B CN202110667010.0A CN202110667010A CN113410817B CN 113410817 B CN113410817 B CN 113410817B CN 202110667010 A CN202110667010 A CN 202110667010A CN 113410817 B CN113410817 B CN 113410817B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005669 field effect Effects 0.000 claims description 35
- 230000001960 triggered effect Effects 0.000 claims description 11
- 239000011324 bead Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000007792 addition Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention relates to the technical field of circuit protection, in particular to a short-circuit protection circuit, a device with the circuit and a method, wherein the short-circuit protection circuit comprises a driving switch, a short-circuit protection switch unit and a load unit, and the driving switch is coupled with a power supply end and a power utilization end and used for controlling the disconnection of an integrated circuit; the short-circuit protection switch unit is coupled with the integrated circuit and the driving switch and used for controlling the disconnection of the driving switch; the load unit is coupled with the power supply end and the power utilization end and is used for protecting when the power utilization end is short-circuited; the load unit is also coupled with the short-circuit protection switch unit; the short-circuit protection switch unit comprises a first protection switch, and the first protection switch is coupled with the power utilization end; the circuit can maintain long-time short-circuit protection, and can immediately resume operation after the short-circuit condition is removed under the condition of power-on, and components in the circuit are not damaged.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a short-circuit protection circuit, a device with the circuit and a method.
Background
At present, short-circuit protection circuits on the market are basically based on short-time short-circuit protection, and the short-circuit protection can be continued after the short-circuit protection is finished by powering on again, so that the problem of how to enable the circuit to automatically resume operation after the short-circuit condition is removed is the problem considered by the application.
For this reason, many manufacturers and knowledgeable individuals develop and develop them, but no ideal product has been developed so far.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a short-circuit protection circuit, a device with the short-circuit protection circuit and a method for realizing long-time short-circuit protection of the short-circuit protection circuit by coupling a plurality of protection switches and controlling the conduction sequence of each protection switch.
In order to achieve the above object, according to a first aspect, the present invention adopts the following technical scheme: a short-circuit protection circuit adapted to short-circuit protect an integrated circuit, the integrated circuit including a power supply terminal and a power use terminal, the short-circuit protection circuit comprising: the driving switch is coupled with the power supply end and the power utilization end and is used for controlling the disconnection of the integrated circuit;
the short-circuit protection switch unit is coupled with the integrated circuit and the driving switch and used for controlling the disconnection of the driving switch;
The load unit is coupled with the power supply end and the power utilization end and is used for protecting when the power utilization end is short-circuited; the load unit is also coupled with the short-circuit protection switch unit;
The short-circuit protection switch unit comprises a first protection switch, and the first protection switch is coupled with the power utilization terminal.
The short-circuit protection switch unit further comprises a second protection switch and a third protection switch;
the second protection switch is coupled with the first protection switch, and is respectively connected with the third protection switch and the power supply end, and the second protection switch is used for controlling the disconnection of the third protection switch;
the third protection switch is connected to the driving switch and the power supply end respectively and is used for controlling the disconnection of the driving switch.
The driving switch is a field effect transistor Q1, a source electrode of the field effect transistor Q1 is connected to an electricity utilization end, a drain electrode of the field effect transistor Q1 is respectively connected to the first protection switch and the electricity utilization end, and a grid electrode of the field effect transistor Q1 is grounded; the first protection switch is a triode Q2, the base electrode of the triode Q2 is connected to the drain electrode of the field effect tube Q1 and the power utilization end and is connected to the power supply end through the load unit, the collector electrode of the triode Q2 is respectively connected to the power supply end and the second protection switch, and the emitter electrode of the triode Q2 is grounded; the second protection switch is a triode Q3, the base electrode of the triode Q3 is connected to the power supply end, the collector electrode of the triode Q3 is connected to the third protection switch, and the emitter electrode of the triode Q3 is grounded; the third protection switch is a triode Q4, the base electrode of the triode Q4 is connected to the collector electrode of the triode Q3, the emitting electrode of the triode Q4 is connected to the source electrode and the power supply end of the field effect transistor Q1, and the collector electrode of the triode Q4 is grounded.
The load unit comprises a load resistor R2 and a magnetic bead FB1; the first end of the load resistor R2 is connected to the power supply end, the second end of the load resistor R2 is connected to the power utilization end and the base electrode of the triode Q2, and the drain electrode of the field effect transistor Q1, the second end of the load resistor R2 and the base electrode of the triode Q2 are connected to the power utilization end through the magnetic bead FB 1.
In a second aspect, the present invention provides a protection method for driving the short-circuit protection circuit mentioned in the first aspect, which is suitable for short-circuit protection of an integrated circuit, the integrated circuit including a power supply terminal, a driving switch, and a power consumption terminal, and the protection method includes:
determining the conduction condition of a protection switch module coupled with a voltage dividing module according to the resistance value of the voltage dividing module;
determining whether to trigger a short-circuit protection program according to the conduction condition of the protection switch module;
If the short-circuit protection program is triggered, the protection switch module and the power supply end form a circuit loop for prohibiting current from flowing through the power utilization end.
The step of determining the conduction of the protection switch module coupled with the voltage division module according to the resistance value of the voltage division module comprises the following steps:
when the input voltages are equal, the input voltages are divided by the voltage dividing module, and then the required conducting voltage is preferentially reached to the base electrode of the protection switch module, so that the protection switch module is conducted.
The step of determining whether to trigger a short-circuit protection procedure according to the conduction condition of the protection switch module comprises the following steps:
when the power utilization end is short-circuited, a voltage drop is generated at a first protection switch base electrode which is coupled with the power utilization end in the protection switch module;
when the opening voltage of the base electrode of the first protection switch is reduced to 0V, the first protection switch is disconnected, and the short-circuit protection program is triggered;
when the short-circuit protection program is triggered, the protection switch module and the power supply end form a circuit loop for prohibiting current from flowing through the power utilization end.
When the input voltage causes the conduction of the protection switch module to be inconsistent with the set conduction condition, the output voltage is self-locked.
In a third aspect, the present invention provides a short-circuit protection circuit driving device for performing a short-circuit protection procedure, comprising: the device comprises an integrated circuit, a voltage dividing module, a protection switch module and a load unit;
the integrated circuit comprises an electricity utilization end, a power supply end and a driving switch, wherein the driving switch is connected between the electricity utilization end and the power supply end and is used for controlling the disconnection of the integrated circuit;
The voltage dividing module is coupled with the protection switch module, the load unit and the integrated circuit,
The protection switch module is coupled with the load unit and the integrated circuit;
The voltage division module is used for controlling the conduction of the protection switch module, and the conduction of the protection switch is used for controlling whether to execute a short-circuit protection program.
When the short-circuit protection program is triggered, the protection switch module, the power supply end and the load unit form a circuit loop for prohibiting current from flowing through the power utilization end.
The invention has the advantages that: under the condition of normal power on, the power supply end and the power utilization end are conducted through the driving switch, and the protection switch module is in a normal conduction sequence at the moment; when in short circuit, the short circuit protection program is executed to control the drive switch to be disconnected so that the power supply end and the power utilization end are conducted through the load unit, the circuit can keep long-time short circuit protection, and the operation can be immediately recovered after the short circuit condition is removed under the condition of electrifying, and components in the circuit can not be damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the technical solutions related to the embodiments with respect to the accompanying drawings, and it is obvious that the drawings described in this specification are only some possible embodiments of the present invention, and other drawings identical or similar to the technical solutions of the present invention can be obtained according to the following drawings without any inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a short-circuit protection circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a short-circuit protection circuit according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for protecting a short-circuit protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an integrated circuit driving device with a short-circuit protection circuit according to an embodiment of the invention.
Reference numerals and components referred to in the drawings are as follows:
The integrated circuit 1, the power supply terminal 11, the power utilization terminal 12, the driving switch 13, the short-circuit protection circuit 2, the load protection module 3, the protection switch module 31, the load unit 32, the first protection switch 311, the second protection switch 312, the third protection switch 313, the voltage division module 4, the first voltage division module 41, the second voltage division module 42, the third voltage division module 43, the driving device 5 and the driving circuit 51.
Detailed Description
The technical solutions described in the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments described in the present specification are only some of the possible technical solutions of the present invention, and other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any inventive effort should be considered as falling within the scope of protection of the present invention.
It should be noted that the descriptions of the "first" and "second" and the like used in the embodiments of the present invention are used for descriptive purposes only and should not be construed as indicating or implicitly indicating the number of the defined technical features, and thus, the features defining the "first" and the "second" in each embodiment of the present invention may indicate that at least one of the defined technical features is included.
The technical solutions of the embodiments of the present invention described in the present specification may be combined with each other, but it is necessary that the technical solutions are based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are combined with each other or cannot be implemented, the technical solutions should be considered as not being combined.
As shown in fig. 1, according to one aspect of the present invention, there is provided a short-circuit protection circuit adapted to short-circuit-protect an integrated circuit 1 including a power supply terminal 11 and a power use terminal 12, the short-circuit protection circuit 2 including: a driving switch 13, a short-circuit protection switch unit 31 and a load unit 32, wherein the driving switch 13 is coupled to the power supply terminal 11 and the power utilization terminal 12, and is used for controlling the turn-off of the integrated circuit 1; the short-circuit protection switch unit 31 is coupled to the integrated circuit 1 and the driving switch 13, and is configured to control the on/off of the driving switch 13; the load unit 32 is coupled to the power supply terminal 11 and the power consumption terminal 12, and is used for protecting when the power consumption terminal 12 is short-circuited; the load unit 32 is further coupled to the short-circuit protection switch unit 31; the short-circuit protection switch unit 31 includes a first protection switch 311, and the first protection switch 311 is coupled to the power utilization terminal 12;
When the power supply is normally electrified, the driving switch 13 is in a conducting state, and the power supply end 11 is conducted with the power utilization end 12 through the driving switch 13;
When a short circuit occurs, the short circuit protection switch 2 performs a short circuit protection procedure to control the driving switch 13 to be turned off, so that the power supply terminal 11 is turned on with the power consumption terminal 12 through the load unit 32.
Under the condition of normal power-on, the power supply end 11 and the power utilization end 12 are conducted through the driving switch 13, and during short circuit, the driving switch 13 is controlled to be disconnected to enable the power supply end 11 and the power utilization end 12 to be conducted through the load unit 32.
Preferably, the short-circuit protection switch unit 31 further includes a second protection switch 312 and a third protection switch 313;
the second protection switch 312 is coupled to the first protection switch 311, the second protection switch 312 is connected to the third protection switch 313 and the power supply terminal 11, respectively, and the second protection switch 312 is used for controlling the turn-off of the third protection switch 313;
the third protection switch 313 is connected to the driving switch 13 and the power supply terminal 11, respectively, and is used for controlling the on/off of the driving switch 13.
When the driving switch 13 is turned on, the power supply terminal 11 is turned on with the power consumption terminal 12 through the driving switch 13, and at this time, the first protection switch 311 is turned on;
When the first protection switch 311 is turned on, the second protection switch 312 and the third protection switch 313 are turned off;
when the power utilization terminal 12 is short-circuited, the first protection switch 311 is turned off, and the second protection switch 312 is turned on;
when the second protection switch 312 is turned on, the third protection switch 313 is turned on;
When the third protection switch 313 is turned on, the driving switch 13 is turned off, and the power supply terminal 11 is turned on to the power consumption terminal 12 through the load unit 32.
Specifically, the driving switch 13 is a field effect transistor Q1, a source electrode of the field effect transistor Q1 is connected to the power utilization terminal 12, a drain electrode of the field effect transistor Q1 is respectively connected to the first protection switch 311 and the power utilization terminal 12, and a gate electrode of the field effect transistor Q1 is grounded.
The first protection switch 311 is a triode Q2, a base electrode of the triode Q2 is connected to a drain electrode of the field effect transistor Q1 and the power utilization end 12 and is connected to the power supply end 11 through the load unit 32, a collector electrode of the triode Q2 is respectively connected to the power supply end 11 and the second protection switch 312, and an emitter electrode of the triode Q2 is grounded.
The second protection switch 312 is a triode Q3, a base electrode of the triode Q3 is connected to the power supply end 11, a collector electrode of the triode Q3 is connected to the third protection switch 313, and an emitter electrode of the triode Q3 is grounded.
The third protection switch 313 is a triode Q4, the base electrode of the triode Q4 is connected to the collector electrode of the triode Q3, the emitter electrode of the triode Q4 is connected to the source electrode and the power supply end 7 of the field effect transistor Q1, and the collector electrode of the triode Q4 is grounded.
The load unit 32 comprises a resistor R2, a first end of the resistor R2 is connected to the power supply end 11, and a second end of the resistor R2 is connected to the power utilization end 12 and a base electrode of the triode Q2; as a load resistor in the event of a short circuit;
The magnetic bead FB1 is also included, and the drain electrode of the field effect transistor Q1, the second end of the resistor R2 and the base electrode of the triode Q2 are connected to the power utilization end 12 through the magnetic bead FB 1; the magnetic bead FB1 plays a role of filtering.
As a preferred solution, the field-effect transistor Q1 is P-type, the source electrode of the field-effect transistor Q1 is connected to the power utilization terminal 12 and grounded through the resistor R4 and the resistor R7, the drain electrode of the field-effect transistor Q1 is respectively connected to the first protection switch 311 and the power utilization terminal 12, and the gate electrode of the field-effect transistor Q1 is grounded through the resistor R7.
The triode Q2 is an N-type silicon triode, the base electrode of the triode Q2 is connected to the power utilization end 12, is connected to the drain electrode of the field effect tube Q1 through a resistor R3 and is grounded through a resistor R5; and the collector connected to the power supply terminal 11 and the transistor Q2 through the load unit 32 is connected to the second protection switch 312, and is connected to the power supply terminal 11 through the resistor R1, and the emitter of the transistor Q2 is grounded.
The triode Q3 is an N-type silicon triode, the base electrode of the triode Q3 is connected to the power supply end 11 through a resistor R1, the collector electrode of the triode Q3 is connected to the third protection switch 313, and the emitter electrode of the triode Q3 is grounded through a resistor R6.
The triode Q4 is a P-type silicon triode, the base electrode of the triode Q4 is connected to the collector electrode of the triode Q3, the emitting electrode of the triode Q4 is connected to the source electrode of the field effect tube Q1 and the power supply end 11, and the collector electrode of the triode Q4 is grounded through a resistor R7.
Specifically, when the voltage is input from the power supply terminal 11, during the voltage increasing process, the voltage is continuously output from the field effect transistor Q1 due to the voltage division between the resistor R4 and the resistor R7 by the field effect transistor Q1;
After the voltage is divided by the resistor R3 and the resistor R5, the base electrode of the triode Q2 is loaded with voltage; the input voltage of the power supply end 11 is divided by the resistor R1 and the resistor R6, the base electrode of the triode Q3 is loaded with voltage, and under the condition that the voltage is equal at the same moment, the voltage division of the resistor R3 and the resistor R5 is preferential to reach the conduction voltage required by the triode Q2 at the base electrode of the triode Q2, at the moment, the triode Q3 is not turned on, but the conduction of the triode Q2 triggers the closing of the triode Q3, so that the triode Q4 is ensured to be in a closed state, and in the process of rising the input voltage, the triode Q2, the triode Q3 and the triode Q4 are respectively kept in the on, off and closed states all the time until the voltage of the power utilization end 12 rises to the input voltage of the power supply end 11 and is continuously output.
When the power utilization end 12 is short-circuited, the base electrode of the triode Q2 is reduced to 0V from the opening voltage, so that the triode Q2 is closed, the input voltage is divided by the resistor R1 and the resistor R6 to enable the triode Q3 to be opened, the opening of the triode Q3 triggers the triode Q4 to be opened, the source electrode and the grid electrode of the field effect tube Q1 are equal in voltage, so that the field effect tube Q1 is closed, and the power utilization end 12 is short-circuited, so that the resistor R2 is a load resistor, the damage of components is not caused when the output is short-circuited, the power supply end 11 keeps the input voltage, and the power utilization end 12 is 0V.
When the short circuit state is eliminated in the short circuit state, as the output end of the field effect transistor Q1 has no voltage, the voltage of the power supply end 7 is loaded with the voltage on the base electrode of the triode Q2 through the resistor R2 again, and the whole circuit system is restarted, so that fault elimination and self-recovery can be realized.
The key point of the circuit is that the conduction sequence of the triode Q2 and the triode Q3 must be that the triode Q2 is conducted in preference to the triode Q3.
Furthermore, the whole circuit can be matched with applicable components according to the component working voltage and current under the condition that the input voltage and the working current are determined.
In a second aspect, the present invention provides a protection method of a short-circuit protection circuit, suitable for short-circuit protection of an integrated circuit 1, the integrated circuit including a power supply terminal 11, a driving switch 13, and a power consumption terminal 12, the protection method comprising:
determining the conduction condition of the protection switch module 3 coupled with the voltage division module 4 according to the resistance value of the voltage division module 4;
determining whether to trigger a short-circuit protection program according to the conduction condition of the protection switch module 3;
if the short-circuit protection procedure is triggered, the protection switch module 3 and the power supply terminal 11 form a circuit loop for prohibiting the current from flowing through the power utilization terminal 12.
The step of determining the conduction of the protection switch module 31 coupled to the voltage dividing module 4 according to the resistance value of the voltage dividing module 4 includes:
when the input voltages are equal, the input voltages are divided by the voltage dividing module 4, and then the input voltages reach the required conducting voltage at the base electrode of the protection switch module 3 preferentially, so as to conduct the including switch module 31.
The step of determining whether to trigger a short-circuit protection procedure according to the conduction condition of the protection switch module 3 includes:
when the power consumption terminal 12 is short-circuited, a voltage drop is generated at a base electrode of a protection switch in the protection switch module 3, which is coupled with the power consumption terminal 12;
When the opening voltage of the base electrode of the protection switch is reduced to 0V, the protection switch is disconnected, and the short-circuit protection program is triggered;
When the short-circuit protection procedure is triggered, the protection switch module 3 and the power supply terminal 11 form a circuit loop for prohibiting current from flowing through the power utilization terminal.
When the input voltage causes the conduction of the protection switch module 31 to be inconsistent with the set conduction condition, the output voltage is self-locked.
Specifically, when the input voltage causes the protection switch to be turned off and turned on, the protection switch module 3 and the power supply terminal 11 form a circuit loop, so that when the power utilization terminal 12 is ensured to be short-circuited, the resistor R2 is used as a load resistor, and when the output is ensured to be short-circuited, damage of components is not caused, and at the moment, the power supply terminal 11 maintains the input voltage, and the power utilization terminal 12 is 0V.
In a third aspect, the present invention provides a short-circuit protection circuit driving device for executing the short-circuit protection program according to any one of the embodiments of the second aspect, including: an integrated circuit 1, a voltage dividing module 4, a protection switch module 3 and a load unit 32;
the integrated circuit 1 comprises a power utilization terminal 11, a power supply terminal 12 and a drive switch 13, wherein the drive switch 13 is connected between the power utilization terminal 11 and the power supply terminal 12 and is used for controlling the disconnection of the integrated circuit 1;
The voltage dividing module 4 is coupled to the protection switch module 3, the load unit 32 and the integrated circuit 1;
the protection switch module 3 is coupled with the load unit 32 and the integrated circuit 1;
The voltage dividing module 4 is used for controlling the conduction of the protection switch module 3, and the conduction of the protection switch module is used for controlling whether to execute a short-circuit protection program.
When the short-circuit protection program is triggered, the protection switch module, the power supply end and the load unit form a circuit loop for prohibiting current from flowing through the power utilization end.
Further, the voltage division module 4 includes a first voltage division module 41, a second voltage division module 42, and a third voltage division module 43;
The protection switch module 3 includes a first protection switch 311, a second protection switch 312, and a third protection switch 313; an input node of the first voltage division module 41 is connected with an output end of the power supply end 11, an output node of the first voltage division module 41 is connected with a base electrode of the driving switch 13, an emitter electrode of the driving switch 13 is connected with an input node of the second voltage division module 42, an output node of the second voltage division module 42 is connected with a base electrode of the first protection switch 311, an emitter electrode of the first protection switch 311 is connected with an input node of the third voltage division module 43, an output node of the third voltage division module 43 is connected with a base electrode of the second protection switch 312, an emitter electrode of the second protection switch 312 is connected with a base electrode of the third protection switch 313, and an emitter electrode of the third protection switch 313 is connected with a base electrode of the driving switch 13; the first voltage dividing module 41 is used for driving the switch 13 to continuously output voltage.
When the power utilization end 12 is short-circuited, the first protection switch 311 is disconnected, and the second protection switch 312 is conducted;
when the second protection switch 312 is turned on, the third protection switch 313 is turned on;
When the third protection switch 313 is turned on, the driving switch 13 is turned off, and the power supply terminal 11 is turned on with the power consumption terminal 12 through the load unit 32, so that the current is prevented from being remained to the power consumption terminal 12.
The whole device has low cost and is applicable to a plurality of conventional output short-circuit protection.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and additions to the present invention may be made by those skilled in the art without departing from the principles of the present invention and such modifications and additions are to be considered as well as within the scope of the present invention.
Claims (6)
1. A short-circuit protection circuit adapted to short-circuit protect an integrated circuit, the integrated circuit comprising a power supply terminal and a power use terminal, characterized in that: the short-circuit protection circuit includes: the driving switch is coupled with the power supply end and the power utilization end and is used for controlling the disconnection of the integrated circuit;
the short-circuit protection switch unit is coupled with the integrated circuit and the driving switch and used for controlling the disconnection of the driving switch;
The load unit is coupled with the power supply end and the power utilization end and is used for protecting when the power utilization end is short-circuited; the load unit is also coupled with the short-circuit protection switch unit;
the short-circuit protection switch unit comprises a first protection switch, and the first protection switch is coupled with the power utilization end;
the short-circuit protection switch unit further comprises a second protection switch and a third protection switch;
the second protection switch is coupled with the first protection switch, and is respectively connected with the third protection switch and the power supply end, and the second protection switch is used for controlling the disconnection of the third protection switch;
the third protection switch is respectively connected to the driving switch and the power supply end and is used for controlling the disconnection of the driving switch;
The driving switch is a field effect transistor Q1, a source electrode of the field effect transistor Q1 is connected to a power supply end, a drain electrode of the field effect transistor Q1 is respectively connected to the first protection switch and the power utilization end, and a grid electrode of the field effect transistor Q1 is grounded through a resistor R7; the first protection switch is a triode Q2, the base electrode of the triode Q2 is connected to the drain electrode of the field effect transistor Q1 and the power utilization end and is connected to the power supply end through the load unit, the collector electrode of the triode Q2 is connected to the power supply end through a resistor R1, the collector electrode of the triode Q2 is connected with the second protection switch, and the emitter electrode of the triode Q2 is grounded; the second protection switch is a triode Q3, the base electrode of the triode Q3 is connected to the power supply end through a resistor R1, the collector electrode of the triode Q3 is connected to the third protection switch, and the emitter electrode of the triode Q3 is grounded through a resistor R6; the third protection switch is a triode Q4, the base electrode of the triode Q4 is connected to the collector electrode of the triode Q3, the emitter electrode of the triode Q4 is connected to the source electrode and the power supply end of the field effect transistor Q1, and the collector electrode of the triode Q4 is grounded through a resistor R7;
A resistor R4 is arranged in parallel between the collector and the emitter of the triode Q4, and the grid electrode of the field effect transistor Q1 is connected with a resistor R7;
the source electrode of the field effect tube Q1 is connected to the power supply end and grounded through a resistor R4 and a resistor R7, and the field effect tube Q1 is divided by the resistor R4 and the resistor R7;
when the power supply is normally electrified, the driving switch is in a conducting state, and the power supply end is conducted with the power utilization end through the driving switch;
When a short circuit occurs, the short circuit protection switch unit executes a short circuit protection program for controlling the drive switch to be disconnected, so that the power supply end is conducted with the power utilization end through the load unit.
2. The short-circuit protection circuit of claim 1, wherein: the load unit comprises a load resistor R2 and a magnetic bead FB1; the first end of the load resistor R2 is connected to the power supply end, and the drain electrode of the field effect transistor Q1, the second end of the load resistor R2 and the base electrode of the triode Q2 are connected to the power utilization end through the magnetic bead FB 1.
3. A protection method for driving the short-circuit protection circuit of claim 1, adapted for short-circuit protection of an integrated circuit, said integrated circuit comprising a power supply terminal, a driving switch, and a power use terminal, comprising:
determining the conduction condition of a protection switch module coupled with a voltage dividing module according to the resistance value of the voltage dividing module;
determining whether to trigger a short-circuit protection program according to the conduction condition of the protection switch module;
If the short-circuit protection program is triggered, the protection switch module and the power supply end form a circuit loop for prohibiting current from flowing through the power utilization end.
4. A protection method according to claim 3, characterized in that: the step of determining the conduction of the protection switch module coupled with the voltage division module according to the resistance value of the voltage division module comprises the following steps:
When the power supply end inputs voltage, the input voltage is divided by the voltage dividing module and then is preferentially subjected to the required conducting voltage at the base electrode of the protection switch module, so that the protection switch module is conducted.
5. A protection method according to claim 3, characterized in that: the step of determining whether to trigger a short-circuit protection procedure according to the conduction condition of the protection switch module comprises the following steps:
when the power utilization end is short-circuited, a voltage drop is generated at a first protection switch base electrode which is coupled with the power utilization end in the protection switch module;
when the opening voltage of the base electrode of the first protection switch is reduced to 0V, the first protection switch is disconnected, and the short-circuit protection program is triggered;
when the short-circuit protection program is triggered, the protection switch module and the power supply end form a circuit loop for prohibiting current from flowing through the power utilization end.
6. The protection method according to claim 5, wherein: when the input voltage causes the conduction of the protection switch module to be inconsistent with the set conduction condition, the output voltage is self-locked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110667010.0A CN113410817B (en) | 2021-06-16 | 2021-06-16 | Short-circuit protection circuit, device with circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110667010.0A CN113410817B (en) | 2021-06-16 | 2021-06-16 | Short-circuit protection circuit, device with circuit and method |
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| CN113410817A CN113410817A (en) | 2021-09-17 |
| CN113410817B true CN113410817B (en) | 2024-05-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002368594A (en) * | 2001-06-11 | 2002-12-20 | Matsushita Electric Ind Co Ltd | Load driving device |
| JP2015050861A (en) * | 2013-09-03 | 2015-03-16 | セイコーエプソン株式会社 | Short circuit protection circuit, power circuit and power supply |
| CN206211500U (en) * | 2016-10-31 | 2017-05-31 | 江苏科华智能控制设备有限公司 | A kind of power protection design of hardware and software of anti-output short-circuit |
| CN212695971U (en) * | 2020-09-08 | 2021-03-12 | 北京中科知创电器有限公司上海青浦分公司 | Short-circuit protection module with current-limiting function |
| CN215601019U (en) * | 2021-06-16 | 2022-01-21 | 金华卓远实业有限公司 | Short-circuit protection circuit |
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- 2021-06-16 CN CN202110667010.0A patent/CN113410817B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002368594A (en) * | 2001-06-11 | 2002-12-20 | Matsushita Electric Ind Co Ltd | Load driving device |
| JP2015050861A (en) * | 2013-09-03 | 2015-03-16 | セイコーエプソン株式会社 | Short circuit protection circuit, power circuit and power supply |
| CN206211500U (en) * | 2016-10-31 | 2017-05-31 | 江苏科华智能控制设备有限公司 | A kind of power protection design of hardware and software of anti-output short-circuit |
| CN212695971U (en) * | 2020-09-08 | 2021-03-12 | 北京中科知创电器有限公司上海青浦分公司 | Short-circuit protection module with current-limiting function |
| CN215601019U (en) * | 2021-06-16 | 2022-01-21 | 金华卓远实业有限公司 | Short-circuit protection circuit |
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| CN113410817A (en) | 2021-09-17 |
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