CN108631259A - A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit - Google Patents
A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit Download PDFInfo
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- CN108631259A CN108631259A CN201810371055.1A CN201810371055A CN108631259A CN 108631259 A CN108631259 A CN 108631259A CN 201810371055 A CN201810371055 A CN 201810371055A CN 108631259 A CN108631259 A CN 108631259A
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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
- H02H3/006—Calibration or setting of parameters
-
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of adjustable overcurrent protection and overcurrent turn-off function latching circuits; it is related to technical field of electric control; it is formed including current sampling circuit, overcurrent protection initialization circuit and overcurrent self-locking circuit; the current sampling circuit includes the first triode, the first diode; the overcurrent protection initialization circuit includes third transistor, the second diode, and the overcurrent self-locking circuit includes the second triode.A kind of voltage triggered hardware lock and release circuit that the present invention is constituted using discrete component; status information when can continue to triggering after trigger signal disappearance; this information can be with rapid feedback to the control terminal for causing trigger voltage signal, to achieve the purpose that protect circuit and load.
Description
Technical field
The present invention relates to technical field of electric control, more particularly to a kind of adjustable overcurrent protection and overcurrent turn-off function self-locking electricity
Road.
Background technology
With the high speed development of power electronic technique, power electronic equipment is intended to high concentration and micromation.In this way,
Wiring workload just becomes much larger more complicated, when practical application, inevitably has wiring error, often can accidentally connect the ports I/O
Onto other loads, and the powerful load of misconnection, port overcurrent may be caused to burn, bring the trouble of after-sale service.
It therefore, be to each ports I/O of system it is necessary to design overcurrent protection measure, to avoid the generation of similar accident.
At present in hardware circuit, protection signal is changed at any time with the change of over-current signal, and over-current signal disappears
Afterwards, status signal also disappears therewith.It can not thus be accomplished to control overcurrent size according to the requirement of different loads.And
And if overcurrent does not cancel in time after occurring, load driving chip is may result on off state repeatedly, with heat
Accumulation, it is likely that cause driving chip to be burned.
Invention content
Technical problem to be solved by the present invention lies in defect for the above-mentioned prior art, a kind of adjustable overcurrent of proposition is protected
Shield and overcurrent turn-off function latching circuit have adjustable overcurrent size and overcurrent turn-off function self-locking function；It can be by adjusting adopting
Sample divider resistance sets overcurrent size, and when overcurrent occurs in circuit, overcurrent self-locking circuit is opened, and drags down supported chip control
Terminal voltage processed, makes it be always held at off state.
Technical scheme of the present invention：
A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit, including current sampling circuit, overcurrent protection initialization circuit and mistake
Latching circuit composition is flowed, the current sampling circuit includes the first triode, the first diode, the base stage of first triode
It is connected with load control signal by the first diode and first resistor, the collector of the first triode passes through load and power supply phase
Even, the emitter of the first triode is grounded by second resistance；The overcurrent protection initialization circuit includes third transistor, second
Diode, the base stage of the third transistor are connected with the 6th resistance, the current collection of the other end and the second triode of the 6th resistance
Pole is connected with the 5th resistance, and the other end of the 5th resistance is connected with 3rd resistor and the 4th resistance, the other end of 3rd resistor with
Second resistance is connected, the other end ground connection of the 4th resistance, the collector of third transistor and the 9th resistance and the second diode phase
Even, the second diode other end is connected with first resistor and the first diode, the other end of the 9th resistance by the 8th resistance and+
5V power supplys are connected, the emitter ground connection of third transistor；The overcurrent self-locking circuit includes the second triode, the two or three pole
The base stage of pipe is connected with the 7th resistance, and the 7th resistance other end is connected with the 8th resistance and the 9th resistance, the collection of the second triode
Electrode is connected with+5V power supplys, and the emitter of the second triode is connected with the 5th resistance and the 6th resistance.
Further, the current sample point of the current sampling circuit is the emitter and second resistance of the first triode
With 3rd resistor connecting place.
Further, the overcurrent of the overcurrent protection initialization circuit is set by current sample point through 3rd resistor and the 4th
It is obtained after electric resistance partial pressure, the 4th resistance is adjustable resistance.
Further, the electric conduction for voltage >=third transistor base stage that the 3rd resistor and the 4th electric resistance partial pressure obtain
When pressure, overcurrent self-locking circuit start.
Further, the second triode of the overcurrent self-locking circuit and third transistor are used cooperatively, the three or three pole
Pipe conducting the second triode ON of control, the second triode ON maintain third transistor conducting.
Further, the overcurrent self-locking circuit start drags down voltage between first resistor and the first diode, and first
Triode is closed.
Beneficial effects of the present invention are：A kind of voltage triggered hardware lock and release circuit constituted using discrete component,
Status information when can continue to triggering after trigger signal disappearance, this information can be with rapid feedbacks to causing trigger voltage
The control terminal of signal, to achieve the purpose that protect circuit and load.
Description of the drawings
Fig. 1 is schematic diagram of circuit connection structure of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment 1：
A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit, as shown in Figure 1, being set including current sampling circuit, overcurrent protection
Determine circuit and overcurrent self-locking circuit composition, the current sampling circuit includes the first triode Q1, the first diode D1, and described the
The base stage of one triode Q1 is connected by the first diode D1 and first resistor R1 with load control signal, the first triode Q1's
Collector is connected by loading M1 with power supply VCC, and the emitter of the first triode Q1 is grounded GND by second resistance R2；
The overcurrent protection initialization circuit includes third transistor Q3, the second diode D2, the base stage of the third transistor Q3
It is connected with the 6th resistance R6, the other end of the 6th resistance R6 is connected with the collector of the second triode Q2 and the 5th resistance R5, the
The other end of five resistance R5 is connected with 3rd resistor R3 and the 4th resistance R4, the other end and the second resistance R2 phases of 3rd resistor R3
Even, the other end of the 4th resistance R4 is grounded GND, the collector of third transistor Q3 and the 9th resistance R9 and the second diode D2 phases
Even, the second diode D2 other ends are connected with first resistor R1 and the first diode D1, and the other end of the 9th resistance R9 passes through the
Eight resistance R8 are connected with+5V power supplys, and the emitter of third transistor Q3 is grounded GND；
Further, the overcurrent self-locking circuit includes the second triode Q2, the base stage of the second triode Q2 and the 7th electricity
Hinder R7 be connected, the 7th resistance R7 other ends are connected with the 8th resistance R8 and the 9th resistance R9, the collector of the second triode Q2 and+
5V power supplys are connected, and the emitter of the second triode Q2 is connected with the 5th resistance R5 and the 6th resistance R6.
Further, the current sample point of the current sampling circuit is the emitter and the second electricity of the first triode Q1
Hinder R2 and 3rd resistor R3 connecting places.
Further, the overcurrent setting of the overcurrent protection initialization circuit by current sample point through 3rd resistor R3 and the
It is obtained after four resistance R4 partial pressures, the 4th resistance R4 is adjustable resistance.
Further, voltage >=third transistor Q3 base stages that the 3rd resistor R3 and the 4th resistance R4 are divided
When conducting voltage, overcurrent self-locking circuit start.
Further, the second triode Q2 and third transistor Q3 of the overcurrent self-locking circuit are used cooperatively, third
Triode Q3 conducting control the second triode Q2 conductings, the second triode Q2 conductings maintain third transistor Q3 conductings.
Further, the overcurrent self-locking circuit start drags down voltage between first resistor R1 and the first diode D1,
First triode Q1 is closed.
Beneficial effects of the present invention are：A kind of voltage triggered hardware lock and release circuit constituted using discrete component,
Status information when can continue to triggering after trigger signal disappearance, this information can be with rapid feedbacks to causing trigger voltage
The control terminal of signal, to achieve the purpose that protect circuit and load.
The basic principles, main features and advantages of the present invention have been shown and described above.The present invention is not by upper
The limitation of embodiment is stated, the above embodiments and description only illustrate the principle of the present invention, is not departing from the present invention
Various changes and improvements may be made to the invention under the premise of spirit and scope, these changes and improvements both fall within claimed sheet
In the range of invention.The claimed scope of the invention is defined by appended claims and its equivalent.
Claims (6)
1. a kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit, including current sampling circuit, overcurrent protection initialization circuit and
Overcurrent self-locking circuit forms, it is characterised in that：The current sampling circuit includes the first triode, the first diode, and described the
The base stage of one triode is connected by the first diode and first resistor with load control signal, and the collector of the first triode is logical
Overload is connected with power supply, and the emitter of the first triode is grounded by second resistance；
The overcurrent protection initialization circuit includes third transistor, the second diode, the base stage of the third transistor and the 6th
Resistance is connected, and the other end of the 6th resistance is connected with the collector of the second triode and the 5th resistance, the other end of the 5th resistance
It is connected with 3rd resistor and the 4th resistance, the other end of 3rd resistor is connected with second resistance, the other end ground connection of the 4th resistance,
The collector of third transistor is connected with the 9th resistance and the second diode, the second diode other end and first resistor and first
Diode is connected, and the other end of the 9th resistance is connected by the 8th resistance with+5V power supplys, the emitter ground connection of third transistor；
The overcurrent self-locking circuit includes the second triode, and the base stage of second triode is connected with the 7th resistance, the 7th electricity
The resistance other end is connected with the 8th resistance and the 9th resistance, and the collector of the second triode is connected with+5V power supplys, the second triode
Emitter is connected with the 5th resistance and the 6th resistance.
2. a kind of adjustable overcurrent protection as described in claim 1 and overcurrent turn-off function latching circuit, it is characterised in that：The electricity
The current sample point of stream sample circuit is the emitter and second resistance and 3rd resistor connecting place of the first triode.
3. a kind of adjustable overcurrent protection as claimed in claim 1 or 2 and overcurrent turn-off function latching circuit, it is characterised in that：It is described
The overcurrent setting of overcurrent protection initialization circuit obtained after 3rd resistor and the 4th electric resistance partial pressure by current sample point, described the
Four resistance are adjustable resistance.
4. a kind of adjustable overcurrent protection as claimed in claim 3 and overcurrent turn-off function latching circuit, it is characterised in that：The third
When the conducting voltage for voltage >=third transistor base stage that resistance and the 4th electric resistance partial pressure obtain, overcurrent self-locking circuit start.
5. a kind of adjustable overcurrent protection as described in claim 1 and overcurrent turn-off function latching circuit, it is characterised in that：The mistake
The second triode and third transistor for flowing latching circuit are used cooperatively, third transistor conducting the second triode ON of control,
Second triode ON maintains third transistor conducting.
6. a kind of adjustable overcurrent protection as described in claim 1 or 5 and overcurrent turn-off function latching circuit, it is characterised in that：It is described
Overcurrent self-locking circuit start drag down voltage between first resistor and the first diode, the first triode is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810371055.1A CN108631259A (en) | 2018-04-24 | 2018-04-24 | A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810371055.1A CN108631259A (en) | 2018-04-24 | 2018-04-24 | A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN108631259A true CN108631259A (en) | 2018-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810371055.1A Pending CN108631259A (en) | 2018-04-24 | 2018-04-24 | A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit |
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| CN (1) | CN108631259A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109410883A (en) * | 2018-12-27 | 2019-03-01 | 惠科股份有限公司 | A kind of booster circuit of display panel, boost control method and display device |
| CN109494679A (en) * | 2018-11-23 | 2019-03-19 | 苏州绿控传动科技股份有限公司 | A kind of high side switches circuit with overcurrent protection and feedback control function |
| CN110944423A (en) * | 2019-10-13 | 2020-03-31 | 赵志 | Self-locking circuit and rapid self-locking unlocking circuit matched with same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013105726A (en) * | 2011-11-17 | 2013-05-30 | Hitachi Koki Co Ltd | Battery pack and battery cover |
| CN203071874U (en) * | 2012-12-18 | 2013-07-17 | 广东电网公司电力科学研究院 | Over current failure self-locking protection circuit |
| CN204089759U (en) * | 2014-09-12 | 2015-01-07 | 叶良地 | High-frequency power device switch protecting circuit |
| CN205945515U (en) * | 2016-06-29 | 2017-02-08 | 成都四威功率电子科技有限公司 | Switching power supply starts and protection circuit |
-
2018
- 2018-04-24 CN CN201810371055.1A patent/CN108631259A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013105726A (en) * | 2011-11-17 | 2013-05-30 | Hitachi Koki Co Ltd | Battery pack and battery cover |
| CN203071874U (en) * | 2012-12-18 | 2013-07-17 | 广东电网公司电力科学研究院 | Over current failure self-locking protection circuit |
| CN204089759U (en) * | 2014-09-12 | 2015-01-07 | 叶良地 | High-frequency power device switch protecting circuit |
| CN205945515U (en) * | 2016-06-29 | 2017-02-08 | 成都四威功率电子科技有限公司 | Switching power supply starts and protection circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494679A (en) * | 2018-11-23 | 2019-03-19 | 苏州绿控传动科技股份有限公司 | A kind of high side switches circuit with overcurrent protection and feedback control function |
| CN109410883A (en) * | 2018-12-27 | 2019-03-01 | 惠科股份有限公司 | A kind of booster circuit of display panel, boost control method and display device |
| US11100884B2 (en) | 2018-12-27 | 2021-08-24 | HKC Corporation Limited | Booster circuit of display panel, boost control method and display device |
| CN110944423A (en) * | 2019-10-13 | 2020-03-31 | 赵志 | Self-locking circuit and rapid self-locking unlocking circuit matched with same |
| CN110944423B (en) * | 2019-10-13 | 2021-07-09 | 北京东方百士电子有限公司 | Self-locking circuit and rapid self-locking unlocking circuit matched with same |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181009 |
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| RJ01 | Rejection of invention patent application after publication |