CN113410817A - Short-circuit protection circuit, device with same and method - Google Patents
Short-circuit protection circuit, device with same and method Download PDFInfo
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- CN113410817A CN113410817A CN202110667010.0A CN202110667010A CN113410817A CN 113410817 A CN113410817 A CN 113410817A CN 202110667010 A CN202110667010 A CN 202110667010A CN 113410817 A CN113410817 A CN 113410817A
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- 230000005669 field effect Effects 0.000 claims description 25
- 230000001960 triggered effect Effects 0.000 claims description 12
- 239000011324 bead Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
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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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Abstract
The invention relates to the technical field of circuit protection, in particular to a short-circuit protection circuit, a device with the short-circuit protection circuit and a method with the short-circuit protection circuit, wherein the short-circuit protection circuit comprises a driving switch, a short-circuit protection switch unit and a load unit, wherein the driving switch is coupled with a power supply end and a power utilization end and is used for controlling the on-off 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 on-off of the driving switch; the load unit is coupled with the power supply end and the power utilization end and is used for playing a role in protection 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 keep long-time short-circuit protection, can immediately recover to operate after the short-circuit condition is removed under the power-on condition, and does not damage components in the circuit.
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 short-circuit protection circuit and a method with the short-circuit protection circuit.
Background
At present, short-circuit protection circuits in the market are basically based on short-time short-circuit protection, and can continue to operate only by being electrified again after the short-circuit protection, and how to automatically recover the operation of the circuit after the short-circuit condition is removed is exactly the problem considered by the application.
Therefore, many manufacturers and acquaintances develop and develop the products, but no ideal products are available.
Disclosure of Invention
The present invention is directed to provide a short-circuit protection circuit, a device having the same, and a method thereof, which are used to implement long-time short-circuit protection of a short-circuit protection circuit by coupling a plurality of protection switches and controlling the turn-on sequence of each protection switch.
In order to achieve the above object, in a first aspect, the present invention adopts the following technical solutions: a short-circuit protection circuit adapted to short-circuit protect an integrated circuit, the integrated circuit including a power supply terminal and a power consumption terminal, the short-circuit protection circuit comprising: the driving switch is coupled with the power supply end and the power utilization end and used for controlling the on-off of the integrated circuit;
the short-circuit protection switch unit is coupled with the integrated circuit and the drive switch and is used for controlling the on-off of the drive switch;
the load unit is coupled with the power supply end and the power utilization end and is used for playing a role in protection 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 which is coupled with the power utilization end.
The short-circuit protection switch unit also comprises a second protection switch and a third protection switch;
the second protection switch is coupled with the first protection switch, the second protection switch is respectively connected with the third protection switch and the power supply end, and the second protection switch is used for controlling the on-off 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 on-off of the driving switch.
The driving switch is a field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected to an electricity utilization end, the drain electrode of the field effect transistor Q1 is respectively connected to the first protection switch and the electricity utilization end, and the grid electrode of the field effect transistor Q1 is grounded; the first protection switch is a triode Q2, the base of the triode Q2 is connected to the drain of a field effect transistor Q1 and the power utilization end and is connected to the power supply end through the load unit, the collector of the triode Q2 is respectively connected to the power supply end and the second protection switch, and the emitter of the triode Q2 is grounded; the second protection switch is a triode Q3, the base of the triode Q3 is connected to the power supply terminal, the collector of the triode Q3 is connected to the third protection switch, and the emitter of the triode Q3 is grounded; the third protection switch is a triode Q4, the base of the triode Q4 is connected to the collector of the triode Q3, the emitter of the triode Q4 is connected to the source and the power supply end of the field effect transistor Q1, and the collector of the triode Q4 is grounded.
The load unit comprises a load resistor R2 and a magnetic bead FB 1; 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 includes:
determining the conduction condition of a protection switch module coupled with a voltage division module according to the resistance value of the voltage division 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 voltage is equal, the input voltage is divided by the voltage dividing module and then reaches the required conducting voltage preferentially at the base electrode of the protection switch module for conducting the protection switch module.
The step of determining whether to trigger a short-circuit protection program according to the conduction condition of the protection switch module comprises the following steps:
when the power consumption end is short-circuited, a first protection switch base electrode coupled with the power consumption end in the protection switch module generates a voltage drop;
when the turn-on voltage of the base electrode of the first protection switch is reduced to 0V, the first protection switch is switched off, 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 not to accord 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 apparatus for executing a short-circuit protection procedure, including: the circuit comprises an integrated circuit, a voltage division module, a protection switch module and a load unit;
the integrated circuit comprises a power utilization end, a power supply end and a driving switch, wherein the driving switch is connected between the power utilization end and the power supply end and is used for controlling the on-off 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 terminal and the load unit form a circuit loop for prohibiting current from flowing through the power utilization terminal.
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 at the moment, the protection switch modules are in a normal conduction sequence; when short circuit occurs, the short-circuit protection program is executed to control the drive switch to be switched off so that the power supply end and the power utilization end are switched on through the load unit, the circuit can keep long-time short-circuit protection, and can immediately recover to operate after the short-circuit condition is removed under the power-on condition, and components in the circuit cannot be damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions related to the embodiments are briefly described below with reference to the accompanying drawings, and it is apparent that the drawings described in the present specification are only some possible embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings identical or similar to the technical solutions of the present invention based on the following drawings without any inventive work.
FIG. 1 is a block 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 steps of a short-circuit protection method according to an embodiment of the present invention;
FIG. 4 is a block diagram of an integrated circuit driving device having a short-circuit protection circuit according to an embodiment of the present invention.
The reference numerals and components referred to in the drawings are as follows:
the integrated circuit comprises an integrated circuit 1, a power supply terminal 11, a power utilization terminal 12, a driving switch 13, a short-circuit protection circuit 2, a load protection module 3, a protection switch module 31, a load unit 32, a first protection switch 311, a second protection switch 312, a third protection switch 313, a voltage division module 4, a first voltage division module 41, a second voltage division module 42, a third voltage division module 43, a driving device 5 and a driving circuit 51.
Detailed Description
The technical solutions described in the embodiments of 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 this specification are only a part of possible technical solutions of the present invention, and other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention should be considered as falling within the protection scope of the present invention.
It should be noted that the descriptions of "first", "second", etc. used in the embodiments of the present invention are only for descriptive purposes, and should not be interpreted as indicating or implying any limitation to the number of technical features, and therefore, the features defined as "first", "second", etc. in the embodiments of the present invention may indicate that at least one of the defined technical features is included.
Technical solutions between the embodiments of the present invention described in the present specification may be combined with each other, but it is necessary for those skilled in the art to realize the technical solutions.
As shown in fig. 1, according to an aspect of the present invention, there is provided a short-circuit protection circuit adapted to perform short-circuit protection on an integrated circuit 1, the integrated circuit including a power supply terminal 11 and a power consumption 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 for controlling the on/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 used for controlling the on/off of the driving switch 13; the load unit 32 is coupled to the power supply terminal 11 and the power utilization terminal 12, and is used for protecting when the power utilization 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 comprises a first protection switch 311, wherein the first protection switch 311 is coupled to the power consumption terminal 12;
when the power supply is normally powered on, 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 executes a short-circuit protection procedure to control the driving switch 13 to be turned off, so that the power supply terminal 11 is conducted with the power utilization terminal 12 through the load unit 32.
Under the normal circular telegram condition, power supply end 11 and power consumption end 12 switch on through drive switch 13, and during the short circuit, control drive switch 13 disconnection lets power supply end 11 and power consumption end 12 switch on through load unit 32, and this circuit can keep long-time short circuit protection and can resume the operation immediately after getting rid of the short circuit condition under the circular telegram condition, can not damage the components and parts in the circuit.
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 respectively connected to the third protection switch 313 and the power supply terminal 11, and the second protection switch 312 is used for controlling the third protection switch 313 to be turned on and off;
the third protection switch 313 is respectively connected to the driving switch 13 and the power supply terminal 11, and is configured to control 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 utilization terminal 12 through the driving switch 13, and 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 consumption 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 and the driving switch 13 is turned off, the power supply terminal 11 is turned on with the power consumption terminal 12 through the load unit 32.
Specifically, the driving switch 13 is a field effect transistor Q1, a source of the field effect transistor Q1 is connected to the power consumption terminal 12, a drain of the field effect transistor Q1 is connected to the first protection switch 311 and the power consumption terminal 12, respectively, and a gate of the field effect transistor Q1 is grounded.
The first protection switch 311 is a transistor Q2, a base of the transistor Q2 is connected to the drain of the fet Q1 and the power consumption terminal 12 and to the power supply terminal 11 through the load unit 32, a collector of the transistor Q2 is connected to the power supply terminal 11 and the second protection switch 312, respectively, and an emitter of the transistor Q2 is grounded.
The second protection switch 312 is a transistor Q3, a base of a transistor Q3 is connected to the power supply terminal 11, a collector of a transistor Q3 is connected to the third protection switch 313, and an emitter of the transistor Q3 is grounded.
The third protection switch 313 is a transistor Q4, a base of the transistor Q4 is connected to a collector of the transistor Q3, an emitter of the transistor Q4 is connected to a source of the field effect transistor Q1 and the power supply terminal 7, and a collector of the transistor Q4 is grounded.
The load unit 32 comprises a resistor R2, a first end of the resistor R2 is connected to the power supply terminal 11, and a second end of the resistor R2 is connected to the power utilization terminal 12 and the base of the triode Q2; the resistor is used as a load resistor during short circuit;
the power supply also comprises a magnetic bead FB1, wherein 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 bead FB1 acts as a filter.
Preferably, the fet Q1 is P-type, the source of the fet Q1 is connected to the power consumption terminal 12 and is grounded through the resistor R4 and the resistor R7, the drain of the fet Q1 is connected to the first protection switch 311 and the power consumption terminal 12, respectively, and the gate of the fet 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, and is connected to the drain electrode of the field effect transistor Q1 through a resistor R3 and is grounded through a resistor R5; and the collector of the transistor Q2 and the power supply terminal 11 through the load unit 32 are connected to the second protection switch 312, and the collector of the transistor Q2 and 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 of the triode Q3 is connected to the power supply terminal 11 through the resistor R1, the collector of the triode Q3 is connected to the third protection switch 313, and the emitter of the triode Q3 is grounded through the resistor R6.
The triode Q4 is a P-type silicon triode, the base of the triode Q4 is connected to the collector of the triode Q3, the emitter of the triode Q4 is connected to the source of the field effect transistor Q1 and the power supply terminal 11, and the collector of the triode Q4 is grounded through a resistor R7.
Specifically, when the power supply terminal 11 inputs a voltage, during the voltage increase process, the fet Q1 continuously outputs the voltage due to the voltage division of the resistor R4 and the resistor R7, and the fet Q1 continuously outputs the voltage;
after voltage division is carried out by a resistor R3 and a resistor R5, voltage is loaded on the base electrode of the triode Q2; the input voltage of the power supply terminal 11 is divided by the resistor R1 and the resistor R6, a voltage is loaded on the base of the triode Q3, and under the condition that the voltages are equal at the same moment, the voltage division by the resistor R3 and the resistor R5 preferentially reaches the conduction voltage required by the triode Q2 at the base of the triode Q2, at this time, the triode Q3 is not turned on, but the conduction of the triode Q2 triggers the triode Q3 to be turned off, so that the triode Q4 is ensured to be in a turn-off state, and in the process of rising the input voltage, the triode Q2, the triode Q3 and the triode Q4 respectively maintain the turn-on, turn-off and turn-off states until the voltage of the power utilization terminal 12 rises to the input voltage of the power supply terminal 11 and is continuously output.
When the power consumption end 12 is short-circuited, the base of the triode Q2 is reduced to 0V from the turn-on voltage, so that the triode Q2 is turned off, the input voltage is divided by the resistor R1 and the resistor R6, so that the triode Q3 is turned on, the turn-on trigger triode Q4 of the triode Q3 is turned on, the source and the grid of the field effect transistor Q1 are equal in voltage, so that the field effect transistor Q1 is turned off, because the power consumption end 12 is short-circuited, the resistor R2 is a load resistor at the moment, it is ensured that when the output is short-circuited, the damage of components is not caused, the power supply end 11 keeps the input voltage at the moment, and the power consumption end 12 is 0V.
When the short circuit state is removed in the short circuit state, because the output end of the field effect transistor Q1 has no voltage, the voltage of the power supply end 7 loads the voltage on the base electrode of the triode Q2 through the resistor R2 again, the whole circuit system is restarted, and the self-recovery of the fault removal can be achieved.
The circuit is characterized in that the conduction sequence of the transistor Q2 and the transistor Q3 is that the transistor Q2 is conducted prior to the transistor Q3.
Furthermore, the whole circuit can match applicable components according to the working voltage and current of the components under the condition that the input voltage and the working current are determined.
In a second aspect, the present invention provides a method for protecting a short-circuit protection circuit, which is 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 method comprising:
determining the conduction condition of a protection switch module 3 coupled with a 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 program 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 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 voltage is divided by the voltage dividing module 4 and then reaches a required conducting voltage preferentially at the base of the protection switch module 3, so as to conduct the 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 comprises:
when the power consumption end 12 is short-circuited, a protection switch base electrode coupled with the power consumption end 12 in the protection switch module 3 generates a voltage drop;
when the turn-on voltage of the base electrode of the protection switch is reduced to 0V, the protection switch is switched off, and the short-circuit protection program is triggered;
when the short-circuit protection program 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 not to conform to 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 as to ensure that the power consumption terminal 12 is short-circuited, the resistor R2 serves as a load resistor, and it is ensured that the components are not damaged when the output is short-circuited, at this time, the power supply terminal 11 maintains the input voltage, and the power consumption terminal 12 is 0V.
In a third aspect, the present invention provides a short-circuit protection circuit driving apparatus for executing the short-circuit protection program described in any embodiment of the second aspect, including: the integrated circuit 1, the voltage division module 4, the protection switch module 3 and the load unit 32;
the integrated circuit 1 comprises a power utilization end 11, a power supply end 12 and a driving switch 13, wherein the driving switch 13 is connected between the power utilization end 11 and the power supply end 12 and is used for controlling the on-off 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 to the load unit 32 and the integrated circuit 1;
the voltage division 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 terminal and the load unit form a circuit loop for prohibiting current from flowing through the power utilization terminal.
Further, the voltage dividing module 4 includes a first voltage dividing module 41, a second voltage dividing module 42, and a third voltage dividing module 43;
the protection switch module 3 comprises 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 to the output end of the power supply terminal 11, an output node of the first voltage division module 41 is connected to a base of the driving switch 13, an emitter of the driving switch 13 is connected to an input node of the second voltage division module 42, an output node of the second voltage division module 42 is connected to a base of the first protection switch 311, an emitter of the first protection switch 311 is connected to an input node of the third voltage division module 43, an output node of the third voltage division module 43 is connected to a base of the second protection switch 312, an emitter of the second protection switch 312 is connected to a base of the third protection switch 313, and an emitter of the third protection switch 313 is connected to a base of the driving switch 13; the first voltage dividing module 41 is used for driving the switch 13 to continuously output the voltage.
When the power consumption 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 driving switch 13 is turned off after the third protection switch 313 is turned on, the power supply terminal 11 is turned on with the power consumption terminal 12 through the load unit 32, thereby prohibiting the current from remaining to the power consumption terminal 12.
The whole device has low cost and can be suitable for a plurality of conventional output short-circuit protection.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and additions can be made without departing from the principle of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (10)
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 consumption terminal, wherein: the short-circuit protection circuit includes: the driving switch is coupled with the power supply end and the power utilization end and used for controlling the on-off of the integrated circuit;
the short-circuit protection switch unit is coupled with the integrated circuit and the drive switch and is used for controlling the on-off of the drive switch;
the load unit is coupled with the power supply end and the power utilization end and is used for playing a role in protection 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 which is coupled with the power utilization end.
2. The short-circuit protection circuit of claim 1, wherein: the short-circuit protection switch unit also comprises a second protection switch and a third protection switch;
the second protection switch is coupled with the first protection switch, the second protection switch is respectively connected with the third protection switch and the power supply end, and the second protection switch is used for controlling the on-off 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 on-off of the driving switch.
3. The short-circuit protection circuit of claim 2, wherein: the driving switch is a field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected to an electricity utilization end, the drain electrode of the field effect transistor Q1 is respectively connected to the first protection switch and the electricity utilization end, and the grid electrode of the field effect transistor Q1 is grounded; the first protection switch is a triode Q2, the base of the triode Q2 is connected to the drain of a field effect transistor Q1 and the power utilization end and is connected to the power supply end through the load unit, the collector of the triode Q2 is respectively connected to the power supply end and the second protection switch, and the emitter of the triode Q2 is grounded; the second protection switch is a triode Q3, the base of the triode Q3 is connected to the power supply terminal, the collector of the triode Q3 is connected to the third protection switch, and the emitter of the triode Q3 is grounded; the third protection switch is a triode Q4, the base of the triode Q4 is connected to the collector of the triode Q3, the emitter of the triode Q4 is connected to the source and the power supply end of the field effect transistor Q1, and the collector of the triode Q4 is grounded.
4. The short-circuit protection circuit of claim 1, wherein: the load unit comprises a load resistor R2 and a magnetic bead FB 1; 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 of the triode Q2, and the drain of the field effect transistor Q1, the second end of the load resistor R2 and the base of the triode Q2 are connected to the power utilization end through the inductor FB 1.
5. A method of protecting an integrated circuit from short-circuit conditions by driving the short-circuit protection circuit of claim 1, the integrated circuit comprising a power supply terminal, a driver switch, and a power consumption terminal, the method comprising:
determining the conduction condition of a protection switch module coupled with a voltage division module according to the resistance value of the voltage division 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.
6. The protection method according to claim 5, 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 input voltage is equal, the input voltage is divided by the voltage dividing module and then reaches the required conduction voltage preferentially at the base electrode of the protection switch module, so that the protection switch module is conducted.
7. The protection method according to claim 5, characterized in that: the step of determining whether to trigger a short-circuit protection program according to the conduction condition of the protection switch module comprises the following steps:
when the power consumption end is short-circuited, a first protection switch base electrode coupled with the power consumption end in the protection switch module generates a voltage drop;
when the turn-on voltage of the base electrode of the first protection switch is reduced to 0V, the first protection switch is switched off, 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.
8. The protection method according to claim 7, characterized in that: when the input voltage causes the conduction of the protection switch module not to accord with the set conduction condition, the output voltage is self-locked.
9. A short-circuit protection circuit driving device for executing a short-circuit protection procedure, comprising: the circuit comprises an integrated circuit, a voltage division module, a protection switch module and a load unit;
the integrated circuit comprises a power utilization end, a power supply end and a driving switch, wherein the driving switch is connected between the power utilization end and the power supply end and is used for controlling the on-off 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 module is used for controlling whether to execute a short-circuit protection program.
10. An integrated circuit driving apparatus according to claim 9, wherein: when the short-circuit protection program is triggered, the protection switch module, the power supply terminal and the load unit form a circuit loop for prohibiting current from flowing through the power utilization terminal.
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 |
Applications Claiming Priority (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 |
Publications (2)
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| CN113410817A true CN113410817A (en) | 2021-09-17 |
| CN113410817B 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
- 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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| Publication number | Publication date |
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| CN113410817B (en) | 2024-05-14 |
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