CN108462147B - Start power supply short-circuit protection detection circuit and detection method thereof - Google Patents
Start power supply short-circuit protection detection circuit and detection method thereof Download PDFInfo
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- CN108462147B CN108462147B CN201810296178.3A CN201810296178A CN108462147B CN 108462147 B CN108462147 B CN 108462147B CN 201810296178 A CN201810296178 A CN 201810296178A CN 108462147 B CN108462147 B CN 108462147B
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
The invention discloses a startup power supply short-circuit protection detection circuit which comprises a current coil, wherein a plurality of outgoing heads are connected to the current coil, a Hall sensor is arranged on the current coil, the output end of the Hall sensor is connected to a comparator circuit, the output end of the comparator circuit is connected to a self-locking circuit, the output end of the self-locking circuit is connected to a driving circuit, the output end of the driving circuit is connected to a control coil of a relay, and a power supply is connected with the current coil through the relay. The invention can improve the defects of the prior art, has reliable short circuit detection protection function and has stable protection effect on the power supply.
Description
Technical Field
The invention relates to the technical field of overcurrent protection, in particular to a startup power supply short-circuit protection detection circuit and a detection method thereof.
Background
The short circuit (overcurrent) of the starting power supply is a common circuit fault, and the starting power supply can be directly burnt out when serious. Chinese patent application 201710048438.0 discloses an overcurrent protection circuit and method for starting a power supply. The technology has the following problems: when the circuit works, the first resistor R, R generates current, voltage and power consumption in the circuit to always consume energy (generate heat to do idle work); when the second output is short-circuited, impact is caused on the battery, and the overcurrent protection circuit comprises an amplifying circuit, a measuring resistor and a boost protection chip U9 after overcurrent; the measuring resistor comprises a resistor R; the measuring resistor R is connected in series in a front-end power supply loop of the automobile starting power supply; the measuring resistor Rx is connected in series in the discharging loop of the energy storage module of the automobile starting power supply; the number of the amplifying circuits is 2, namely a first amplifying circuit and a second amplifying circuit, which are respectively used for measuring the voltage drop on 2 measuring resistors; the amplifying circuit is connected with the feedback end FB of the boost protection chip U9. The over-current protection circuit and the method for the automobile starting power supply adopt an operational amplifier and a boosting protection chip to be combined, and an amplifying circuit is used for cutting off an output loop, wherein the circuit is used for detecting the time from a measuring resistor to cutting off the output loop, if the over-current protection is A, the over-current protection is carried out until the time from the over-current to the cutting off of the output, the protection current is raised to 100A or n times A, and the short circuit discharge is caused to a battery.
Disclosure of Invention
The invention aims to solve the technical problem of providing a startup power supply short-circuit protection detection circuit and a detection method thereof, which can solve the defects of the prior art, have a reliable short-circuit detection protection function and have a stable power supply protection effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
The utility model provides a start-up power short-circuit protection detection circuit, includes current coil, is connected with a plurality of and takes turns on the current coil, installs hall sensor on the current coil, and hall sensor's output is connected to comparator circuit, and comparator circuit's output is connected to auto-lock circuit, and auto-lock circuit's output is connected to drive circuit, and drive circuit's output is connected to the control coil of relay, and the power is connected with current coil through the relay.
Preferably, the input end of the comparator circuit is connected to the normal phase input end of the first operational amplifier through a first resistor, the normal phase input end of the first operational amplifier is grounded through a second resistor, the reverse phase input end of the first operational amplifier is connected to a high level through a fourth resistor, the reverse phase input end of the first operational amplifier is grounded through a third resistor, and the output end of the first operational amplifier is used as the output end of the comparator circuit.
Preferably, the input end of the self-locking circuit is connected to the normal phase input end of the second operational amplifier through a fifth resistor, the reverse phase input end of the second operational amplifier is connected to the high level through a sixth resistor, the reverse phase input end of the second operational amplifier is grounded through a seventh resistor, the output end of the second operational amplifier is connected to the normal phase input end of the second operational amplifier through a diode, and the output end of the second operational amplifier serves as the output end of the self-locking circuit.
Preferably, the input end of the driving circuit is connected to the base electrode of the first triode through an eighth resistor, the base electrode of the first triode is grounded through a first capacitor, the collector electrode of the first triode is connected to a high level through a ninth resistor, the emitter electrode of the first triode is simultaneously connected to the collector electrode and the base electrode of the second triode, the emitter electrode of the second triode is grounded, the base electrode of the first triode is grounded through a tenth resistor, the collector electrode of the first triode is connected to the base electrode of the third triode, the collector electrode of the third triode is connected to the high level, the emitter electrode of the third triode is grounded, a voltage stabilizing diode is connected between the collector electrode of the third triode and the emitter electrode of the third triode, and the collector electrode of the third triode is used as the output end of the driving circuit.
The detection method for the startup power supply short-circuit protection detection circuit comprises the following steps:
the Hall sensor detects the current on the current coil, the detection result is input into the comparator circuit, the output voltage of the comparator circuit is transmitted to the driving circuit through the self-locking circuit, if the output voltage of the comparator circuit is high level, the driving circuit outputs low level, the relay is opened, the output head does not output, if the output voltage of the comparator circuit is low level, the driving circuit outputs high level, the relay is closed, and the output head resumes output.
The beneficial effects brought by adopting the technical scheme are as follows: the invention automatically controls the relay by arranging the comparison circuit, the self-locking circuit and the driving output circuit, can realize quick response and treatment of power supply overcurrent faults and has high reliability.
Drawings
Fig. 1 is a circuit diagram of embodiment 1.
Fig. 2 is a circuit diagram of the comparator circuit in embodiment 1.
Fig. 3 is a circuit diagram of the self-locking circuit in embodiment 1.
Fig. 4 is a circuit diagram of the driving circuit in embodiment 1.
Fig. 5 is a circuit diagram of a filter circuit in embodiment 2.
Detailed Description
Example 1
Referring to fig. 1 to 4, a specific embodiment of the present invention includes a current coil 1, a plurality of heads 2 are connected to the current coil 1, a hall sensor 3 is mounted on the current coil 1, an output end of the hall sensor 3 is connected to a comparator circuit 4, an output end of the comparator circuit 4 is connected to a self-locking circuit 5, an output end of the self-locking circuit 5 is connected to a driving circuit 6, an output end of the driving circuit 6 is connected to a control coil of a relay 7, and a power supply 8 is connected to the current coil 1 through the relay 7. The input end of the comparator circuit 4 is connected to the normal phase input end of the first operational amplifier A1 through a first resistor R1, the normal phase input end of the first operational amplifier A1 is grounded through a second resistor R2, the reverse phase input end of the first operational amplifier A1 is connected to the high level VCC through a fourth resistor R4, the reverse phase input end of the first operational amplifier A1 is grounded through a third resistor R3, and the output end of the first operational amplifier A1 is used as the output end of the comparator circuit 4. The input end of the self-locking circuit 5 is connected to the normal phase input end of the second operational amplifier A2 through a fifth resistor R5, the reverse phase input end of the second operational amplifier A2 is connected to the high level VCC through a sixth resistor R6, the reverse phase input end of the second operational amplifier A2 is grounded through a seventh resistor R7, the output end of the second operational amplifier A2 is connected to the normal phase input end of the second operational amplifier A2 through a diode D1, and the output end of the second operational amplifier A2 serves as the output end of the self-locking circuit 5. The input end of the driving circuit 6 is connected to the base electrode of the first triode Q1 through an eighth resistor R8, the base electrode of the first triode Q1 is grounded through a first capacitor C1, the collector electrode of the first triode Q1 is connected to a high level VCC through a ninth resistor R9, the emitter electrode of the first triode Q1 is simultaneously connected to the collector electrode and the base electrode of the second triode Q2, the emitter electrode of the second triode Q2 is grounded, the base electrode of the first triode Q1 is grounded through a tenth resistor R10, the collector electrode of the first triode Q1 is connected to the base electrode of a third triode Q3, the collector electrode of the third triode Q3 is connected to the high level VCC, the emitter electrode of the third triode Q3 is grounded, a voltage stabilizing diode DZ is connected between the collector electrode of the third triode Q3 and the emitter electrode of the third triode Q3, and the collector electrode of the third triode Q3 serves as the output end of the driving circuit 6.
The detection method for the startup power supply short-circuit protection detection circuit comprises the following steps:
the hall sensor 3 detects the current on the current coil 1, the detection result is input into the comparator circuit 4, the output voltage of the comparator circuit 4 is transmitted to the driving circuit 6 through the self-locking circuit 5, if the output voltage of the comparator circuit 4 is high level, the driving circuit 6 outputs low level, the relay 7 is opened, the head 2 does not output, if the output voltage of the comparator circuit 4 is low level, the driving circuit 6 outputs high level, the relay 7 is closed, and the head 2 resumes outputting.
Example 2
Referring to fig. 5, this embodiment is modified from embodiment 1 in that a filter circuit is provided between the hall sensor 3 and the comparator circuit 4. The input end of the filter circuit is connected to the non-inverting input end of the third operational amplifier A3 through an eleventh resistor R11 and a twelfth resistor R12 which are connected in series, the inverting input end of the third operational amplifier A3 is grounded through a thirteenth resistor R13, the inverting input end of the third operational amplifier A3 is connected to the output end of the third operational amplifier A3 through a fourteenth resistor R14, the output end of the third operational amplifier A3 serves as the output end of the filter circuit, the eleventh resistor R11 and the twelfth resistor R12 are connected to the output end of the third operational amplifier A3 through a second capacitor C2 and a fifteenth resistor R15 which are connected in series, the non-inverting input end of the third operational amplifier A3 is grounded through a third capacitor C3 and a sixteenth resistor R16 which are connected in series, the collector of the fourth triode Q4 is connected between the eleventh resistor R11 and the twelfth resistor R12, the output end of the third operational amplifier A3 is connected to the output end of the filter circuit, the non-inverting input end of the third operational amplifier A3 is connected to the base of the fifth triode Q5 through a third capacitor C3 and a seventeenth resistor R16 which is connected to the base of the fifth triode Q5, and the non-inverting input end of the third operational amplifier A3 is grounded through a seventeenth resistor Q5 which is connected to the emitter of the fifth triode Q5.
The filter circuit can effectively reduce pulse interference of the input comparator circuit, thereby ensuring the running stability of the detection circuit.
In the present invention, the first resistor R1 is 5kΩ, the second resistor R2 is 7kΩ, the third resistor R3 is 10kΩ, the fourth resistor R4 is 20kΩ, the fifth resistor R5 is 3kΩ, the sixth resistor R6 is 6.5kΩ, the seventh resistor R7 is 12kΩ, the eighth resistor R8 is 1kΩ, the ninth resistor R9 is 3kΩ, the tenth resistor R10 is 5.5kΩ, the eleventh resistor R11 is 10kΩ, the twelfth resistor R12 is 1.5kΩ, the thirteenth resistor R13 is 5kΩ, the fourteenth resistor R14 is 2kΩ, the fifteenth resistor R15 is 9.5kΩ, the sixteenth resistor R16 is 3kΩ, and the seventeenth resistor R17 is 6kΩ. The first capacitance C1 is 150. Mu.F, the second capacitance C2 is 200. Mu.F, and the third capacitance C3 is 300. Mu.F. The voltage stabilizing value of the zener diode DZ is 12V, and the high level VCC is 12V.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A start-up power short-circuit protection detection circuit is characterized in that: the automatic control device comprises a current coil (1), wherein a plurality of heads (2) are connected to the current coil (1), a Hall sensor (3) is installed on the current coil (1), the output end of the Hall sensor (3) is connected to a comparator circuit (4), the output end of the comparator circuit (4) is connected to a self-locking circuit (5), the output end of the self-locking circuit (5) is connected to a driving circuit (6), the output end of the driving circuit (6) is connected to a control coil of a relay (7), and a power supply (8) is connected with the current coil (1) through the relay (7);
the input end of the driving circuit (6) is connected to the base electrode of the first triode (Q1) through an eighth resistor (R8), the base electrode of the first triode (Q1) is grounded through a first capacitor (C1), the collector electrode of the first triode (Q1) is connected to a high level (VCC) through a ninth resistor (R9), the emitter electrode of the first triode (Q1) is simultaneously connected to the collector electrode and the base electrode of the second triode (Q2), the emitter electrode of the second triode (Q2) is grounded, the base electrode of the first triode (Q1) is grounded through a tenth resistor (R10), the collector electrode of the first triode (Q1) is connected to the base electrode of the third triode (Q3), the collector electrode of the third triode (Q3) is connected to the high level (VCC), the emitter electrode of the third triode (Q3) is grounded, a voltage stabilizing Diode (DZ) is connected between the collector electrode of the third triode (Q3) and the emitter electrode of the third triode (Q3), and the base electrode of the third triode (Q3) is used as the output end of the driving circuit (6);
the Hall sensor 3 and the comparator circuit 4 are provided with a filter circuit, the input end of the filter circuit is connected to the non-inverting input end of the third operational amplifier A3 through an eleventh resistor R11 and a twelfth resistor R12 which are connected in series, the inverting input end of the third operational amplifier A3 is grounded through a thirteenth resistor R13, the inverting input end of the third operational amplifier A3 is connected to the output end of the third operational amplifier A3 through a fourteenth resistor R14, the output end of the third operational amplifier A3 serves as the output end of the filter circuit, the eleventh resistor R11 and the twelfth resistor R12 are connected to the output end of the third operational amplifier A3 through a second capacitor C2 and a fifteenth resistor R15 which are connected in series, the non-inverting input end of the third operational amplifier A3 is grounded through a third capacitor C3 and a sixteenth resistor R16 which are connected in series, the collector of the fourth transistor Q4 is connected to the base of a fourth transistor Q4, the collector of the fourth transistor Q4 is connected to the eleventh resistor R11 and the twelfth resistor R12, the non-inverting input end of the third operational amplifier A3 is connected to the base of the fifth transistor Q5 through a third capacitor C3 and the collector of the fifth transistor Q5 which is connected to the base of the fifth transistor Q5.
2. The startup power short circuit protection detection circuit according to claim 1, wherein: the input end of the comparator circuit (4) is connected to the normal phase input end of the first operational amplifier (A1) through a first resistor (R1), the normal phase input end of the first operational amplifier (A1) is grounded through a second resistor (R2), the reverse phase input end of the first operational amplifier (A1) is connected to the high level (VCC) through a fourth resistor (R4), the reverse phase input end of the first operational amplifier (A1) is grounded through a third resistor (R3), and the output end of the first operational amplifier (A1) serves as the output end of the comparator circuit (4).
3. The startup power short circuit protection detection circuit according to claim 1, wherein: the input end of the self-locking circuit (5) is connected to the normal phase input end of the second operational amplifier (A2) through a fifth resistor (R5), the reverse phase input end of the second operational amplifier (A2) is connected to a high level (VCC) through a sixth resistor (R6), the reverse phase input end of the second operational amplifier (A2) is grounded through a seventh resistor (R7), the output end of the second operational amplifier (A2) is connected to the normal phase input end of the second operational amplifier (A2) through a diode (D1), and the output end of the second operational amplifier (A2) serves as the output end of the self-locking circuit (5).
4. A detection method of a startup power supply short-circuit protection detection circuit according to any one of claims 1 to 3, characterized by comprising the steps of:
the Hall sensor (3) detects the current on the current coil (1), the detection result is input into the comparator circuit (4), the output voltage of the comparator circuit (4) is transmitted to the driving circuit (6) through the self-locking circuit (5), if the output voltage of the comparator circuit (4) is high level, the driving circuit (6) outputs low level, the relay (7) is opened, the head (2) does not output, if the output voltage of the comparator circuit (4) is low level, the driving circuit (6) outputs high level, the relay (7) is closed, and the head (2) resumes output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810296178.3A CN108462147B (en) | 2018-04-04 | 2018-04-04 | Start power supply short-circuit protection detection circuit and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810296178.3A CN108462147B (en) | 2018-04-04 | 2018-04-04 | Start power supply short-circuit protection detection circuit and detection method thereof |
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| CN108462147A CN108462147A (en) | 2018-08-28 |
| CN108462147B true CN108462147B (en) | 2024-03-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687389A (en) * | 2018-12-26 | 2019-04-26 | 深圳市证通电子股份有限公司 | Circuit protection method and device |
| CN111313359B (en) * | 2020-02-16 | 2022-08-12 | 苏州浪潮智能科技有限公司 | Server hot plug circuit short-circuit protection auxiliary device |
| CN113804940B (en) * | 2021-09-23 | 2024-03-01 | 华东光电集成器件研究所 | High-precision closed-loop Hall current sensor circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005198369A (en) * | 2003-12-26 | 2005-07-21 | Tdk Corp | Protection circuit against short circuit |
| CN105356410A (en) * | 2014-08-20 | 2016-02-24 | 南车洛阳机车有限公司 | Electric locomotive test bed short circuit protection device |
| CN105958962A (en) * | 2016-06-07 | 2016-09-21 | 河北梅特电气设备有限公司 | Filtering circuit for lighting metering distribution box |
| CN207967908U (en) * | 2018-04-04 | 2018-10-12 | 河北祥熙电气有限公司 | A kind of startup power supply short-circuit protection detection circuit |
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2018
- 2018-04-04 CN CN201810296178.3A patent/CN108462147B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005198369A (en) * | 2003-12-26 | 2005-07-21 | Tdk Corp | Protection circuit against short circuit |
| CN105356410A (en) * | 2014-08-20 | 2016-02-24 | 南车洛阳机车有限公司 | Electric locomotive test bed short circuit protection device |
| CN105958962A (en) * | 2016-06-07 | 2016-09-21 | 河北梅特电气设备有限公司 | Filtering circuit for lighting metering distribution box |
| CN207967908U (en) * | 2018-04-04 | 2018-10-12 | 河北祥熙电气有限公司 | A kind of startup power supply short-circuit protection detection circuit |
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