CN105591353A - Driving overcurrent protection circuit having anti-oscillation function - Google Patents
Driving overcurrent protection circuit having anti-oscillation function Download PDFInfo
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- CN105591353A CN105591353A CN201610100540.6A CN201610100540A CN105591353A CN 105591353 A CN105591353 A CN 105591353A CN 201610100540 A CN201610100540 A CN 201610100540A CN 105591353 A CN105591353 A CN 105591353A
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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
- H02H3/087—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 for dc applications
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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
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Abstract
The invention discloses a driving overcurrent protection circuit having an anti-oscillation function. When overcurrent phenomenon of driving current occurs, output of a first compactor can be converted from high level to low level, and the slow process of converting the high level to the low level can be realized by a peripheral resistance-capacitance device, and then the wrong protection phenomenon caused by the jitter can be prevented. When the output level of the first comparator is lower than a voltage comparison point of a second comparator, the output of the second comparator can be converted from the high level to the low level quickly, and then the fast switching-off of the driving current can be realized to protect a driving chip and a load device. Interruption of a CPU can be triggered by the low level, and after an interruption signal is received by the CPU, a driving chip switching-off signal can be transmitted, and after a while, the CPU is used to transmit a driving chip starting signal, and then the working of the driving chip can be resumed. When the driving overcurrent is not relieved for a long time, the driving chip can be shut down by the CPU thoroughly after a plurality of times of overcurrent protection, and therefore the problem of the damages on the driving chip or the load caused by the overcurrent can be effectively solved.
Description
Technical field
The invention belongs to electronic product field, is a kind of driving current foldback circuit with anti-oscillation functions, can be applicable to, in the multiple circuit that needs to drive overcurrent protection, especially in the short time, duplicate in the motor-drive circuit of over-current phenomenon avoidance.
Background technology
Current similar holding circuit adopts the formula overcurrent protection measure of having the hiccups more; in the time driving chip to occur overcurrent; before over-current state is removed, drive in the chip circulation in starting, protect, restarting all the time, the time has been grown and can and drive chip to cause damage to load equipment.
Summary of the invention
The object of the present invention is to provide a kind of current foldback circuit with anti-oscillation functions, when providing overcurrent protection to consumer, solve the damage problem causing because of consumer repetition overcurrent.
Technical scheme of the present invention:
A driving current foldback circuit with anti-oscillation functions, is characterized in that, comprises two-stage voltage-regulating circuit and drives chip cut-off signals control circuit;
Two-stage voltage-regulating circuit mainly comprises the first comparator and the second comparator;
Drive current becomes sampled voltage signal through the first resistance sampling, and sampled voltage is input to the negative input end of the first comparator through the second resistance; The 3rd resistance and the 4th resistance is right+voltage after 5V power supply dividing potential drop as a comparison reference voltage be input to the positive input terminal of the first comparator;
The output of the first comparator connects 5V voltage through the 5th resistance; The output of the first comparator is connected to the positive input terminal of the second comparator simultaneously;
The 6th resistance and the 7th resistance will be inputted the negative input end of the second comparator as the reference voltage of secondary comparison after+5V power supply dividing potential drop;
Drive chip cut-off signals control circuit mainly to comprise triode and CPU;
The drive current over-current signal PT of the output output of the second comparator inputs to the base stage of CPU and triode simultaneously, the control end of CPU sends over-current detection State-output control signal MS and is input to the SD control end that drives chip, crosses flow control signals and outputs a control signal to by controlling the unlatching of triode the SD control end that drives chip.
Between the negative input end of the first comparator and ground, be connected the second electric capacity, realize the filtering processing to sampled voltage signal.
Between the positive input terminal of the first comparator and ground, be connected the 4th electric capacity, realize the relatively filtering processing of reference voltage.
Between the output of the first comparator and positive input terminal, connect the 3rd electric capacity, for comparison signal is carried out to Integral Processing.
The output of the first comparator also, simultaneously through the 5th capacity earth, is relatively exported and is carried out filtering the first order.
Between the earth terminal of the power end of the first comparator and the first comparator, be connected the first electric capacity.
The source electrode of triode is connected with+5V power supply.
The base stage of triode is connected with+5V power supply through the 9th resistance, for drawing voltage on provide+5V of triode.
The present invention mainly utilizes two comparators and the peripheral capacitance resistance ware composition of part overcurrent protection sample circuit; when overcurrent appears in drive current; the output of first order comparator becomes low level from high level; realize level by peripheral capacitance resistance ware comparatively slow by high step-down process, avoid shake to cause and protect phenomenon to occur by mistake. When first order comparator output level is during lower than second level comparator voltage comparison point, comparator output in the second level becomes rapidly low level from high level, and this low level realizes and drives chip to turn-off rapidly, and protection drives chip and load equipment; This low level triggers CPU interruption simultaneously, and CPU receives after interrupt signal, sends and drives chip shutdown signal, waits for after certain hour, and CPU sends driving chip start signal, drives chip to resume work. If drive chip overcurrent not remove for a long time, after overcurrent protection several times, CPU thoroughly stops driving chip operation; only has the over current fault problem that solved; re-power, drive chip could recover normal work, efficiently solve because overcurrent causes and drive chip and load to damage phenomenon.
Current foldback circuit of the present invention is in the time driving chip to occur overcurrent, stop immediately driving signal output by hardware, over-current signal is sent to CPU simultaneously, after CPU receives over-current signal, output level keeps closing the state that drives signal, output drive signal again after the time of setting, if now over-current phenomenon avoidance is removed, drive chip to recover normal work; If over-current phenomenon avoidance is not removed, repeat overcurrent protection process. If repeat overcurrent protection process several times, over-current phenomenon avoidance is removed not yet, and CPU can thoroughly stop driving chip operation; only has the over current fault problem that solved; re-power, drive chip could recover normal work, efficiently solve because overcurrent causes and drive chip and load to damage phenomenon.
The present invention has following some novelty:
1, while there is overcurrent protection, close immediately driver output by hardware, CPU receives over-current signal simultaneously, after software is processed, sends and closes drive output signal, keeps recovering to drive chip operation after certain hour;
2, holding circuit has anti-oscillation functions;
3, when over-current phenomenon avoidance keeps always, holding circuit realizes driving chip and thoroughly closes, and after only having over current fault to remove, re-powers, and drives chip could recover normal work, efficiently solves the phenomenon that causes driving chip and load to damage because of overcurrent.
Brief description of the drawings
Fig. 1 has anti-oscillation functions current foldback circuit schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described. Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1: shown in figure, be the current foldback circuit schematic diagram with anti-vibration defencive function. This circuit is specifically divided into two parts: the two-stage voltage-regulating circuit and the driving chip cut-off signals control circuit with anti-oscillation functions with over-current detection function.
Two-stage voltage-regulating circuit comprises comparator U1, comparator U2, resistance R 1, R2, R3, R4, R5, R6, R7 and capacitor C 1, C2, C3, C4, C5, C6.
Through resistance R, 1 sampling becomes sampled voltage signal to drive current, and sampled voltage is input to the 2nd pin negative input end of comparator U1 through resistance R 2, and capacitor C 2 is connected in the 2nd pin negative input end of U1 and realizes the filtering processing to sampled voltage signal. The voltage division processing of resistance R 3 and R4 realize right+5V voltage, voltage after resistance R 3 and R4 dividing potential drop as a comparison reference voltage is input to the 3rd pin positive input terminal of U1, capacitor C 4 is connected in the 3rd pin positive input terminal of U1 and realizes the relatively filtering processing of reference voltage, capacitor C 3 is connected between the 1st pin output and the 3rd pin positive input terminal of U1, for comparison signal is carried out to Integral Processing. The 1st pin output that resistance R 5 and capacitor C 5 are connected in U1 draws voltage and the first order is relatively exported and carried out filtering for output relatively provides on 5V, the first order is relatively exported the 5th pin positive input terminal that is connected to comparator U2 by the 1st pin output of comparator U1. Resistance R 6, R7, capacitor C 6 are carried out the 6th pin negative input end of voltage division processing and filtering access comparator U2 as the reference voltage of secondary comparison using+5V power supply. Capacitor C 1 is connected between the 8 pin power ends of comparator U1 and 4 pin earth terminals carries out filtering processing to the voltage of comparator.
Drive chip cut-off signals control circuit to comprise triode Q1, CPU and resistance R 8, R9, R10, R11.
Drive current over-current signal PT is input to CPU by the 7th pin output of comparator U2, and access the base stage of triode Q1 by resistance R 8 simultaneously, resistance R 9 is drawn voltage for the base stage of triode Q1 provides on 5V, the control end of CPU sends over-current detection State-output control signal MS(hereinafter to be referred as CPU control signal MS) and be input to the SD control end that drives chip by resistance R 10, the control end that resistance R 11 is CPU provides on 5V and draws voltage, and over-current signal PT outputs a control signal to by controlling the unlatching of triode Q1 the SD control end that drives chip.
In the time there is overcurrent, comparator U1 output level becomes low level from high level, and capacitor C 3, C5 make high level become the low level time to slow down slowly, avoid occurring protecting phenomenon because of shake by mistake. When comparator U1 output level becomes lower than+5V*[R7/ (R6+R7)] time, the output of comparator U2 becomes low level from high level, now drives chip controls signal SD to become high level, drives chip to close rapidly; The low level signal of comparator U2 output simultaneously triggers CPU and interrupts, and after CPU handling interrupt signal, the CPU control signal MS sending is become to high level from low level. Owing to having closed driving chip, over-current state is cancelled, triode Q1 turn-offs again, drive chip controls signal SD no longer to play and close the chip effect that drives, now CPU control signal MS continues to make to drive chip in closed condition, wait for certain hour, CPU becomes low level by CPU control signal MS from high level, drives chip to rework. If now over-current phenomenon avoidance is removed, drive chip to recover normal work; If over-current phenomenon avoidance is not removed, repeat overcurrent protection process; If repeat overcurrent protection process several times, over-current phenomenon avoidance is removed not yet, and it is high level that CPU will keep CPU control signal MS always, thoroughly stops driving chip operation. Only have and solved over current fault problem, re-power, drive chip could recover normal work, efficiently solve because overcurrent causes and drive chip and load to damage phenomenon.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (8)
1. a driving current foldback circuit with anti-oscillation functions, is characterized in that, comprises two-stage voltage-regulating circuit and drives chip cut-off signals control circuit;
Two-stage voltage-regulating circuit mainly comprises the first comparator and the second comparator;
Drive current becomes sampled voltage signal through the first resistance sampling, and sampled voltage is input to the negative input end of the first comparator through the second resistance; The 3rd resistance and the 4th resistance is right+voltage after 5V power supply dividing potential drop as a comparison reference voltage be input to the positive input terminal of the first comparator;
The output of the first comparator connects 5V voltage through the 5th resistance; The output of the first comparator is connected to the positive input terminal of the second comparator simultaneously;
The 6th resistance and the 7th resistance will be inputted the negative input end of the second comparator as the reference voltage of secondary comparison after+5V power supply dividing potential drop;
Drive chip cut-off signals control circuit mainly to comprise triode and CPU;
The drive current over-current signal PT of the output output of the second comparator inputs to the base stage of CPU and triode simultaneously, the control end of CPU sends over-current detection State-output control signal MS and is input to the SD control end that drives chip, and drive current over-current signal PT outputs a control signal to by controlling the unlatching of triode the SD control end that drives chip.
2. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, is connected the second electric capacity between the negative input end of the first comparator and ground, realizes the filtering processing to sampled voltage signal.
3. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, is connected the 4th electric capacity between the positive input terminal of the first comparator and ground, realizes the relatively filtering processing of reference voltage.
4. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, connects the 3rd electric capacity, for comparison signal is carried out to Integral Processing between the output of the first comparator and positive input terminal.
5. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, the output of the first comparator also, simultaneously through the 5th capacity earth, is relatively exported and carried out filtering the first order.
6. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, between the earth terminal of the power end of the first comparator and the first comparator, is connected the first electric capacity.
7. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, the source electrode of triode is connected with+5V power supply.
8. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, the base stage of triode is connected with+5V power supply through the 9th resistance, for drawing voltage on provide+5V of triode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100540.6A CN105591353B (en) | 2016-02-24 | 2016-02-24 | A kind of driving current foldback circuit with anti-oscillation functions |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610100540.6A CN105591353B (en) | 2016-02-24 | 2016-02-24 | A kind of driving current foldback circuit with anti-oscillation functions |
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| CN105591353A true CN105591353A (en) | 2016-05-18 |
| CN105591353B CN105591353B (en) | 2018-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115694323A (en) * | 2022-10-11 | 2023-02-03 | 西安电子工程研究所 | Stable tracker locking control method with two-stage overcurrent protection |
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| CN1466255A (en) * | 2002-06-29 | 2004-01-07 | 深圳市中兴通讯股份有限公司 | Output overcurrent and short circuit protector for high power contravariant equipment |
| JP3566201B2 (en) * | 2000-11-10 | 2004-09-15 | シャープ株式会社 | Chopper type regulator |
| CN1852115A (en) * | 2005-09-30 | 2006-10-25 | 华为技术有限公司 | Power-supply control method and apparatus |
| CN102629751A (en) * | 2012-04-26 | 2012-08-08 | 深圳市汉拓数码有限公司 | Over-current protection circuit |
| CN105140890A (en) * | 2015-09-28 | 2015-12-09 | 苏州华兴源创电子科技有限公司 | Steady-state over-voltage protection system |
| CN205407214U (en) * | 2016-02-24 | 2016-07-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Drive current foldback circuit with function is swung in antivibration |
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2016
- 2016-02-24 CN CN201610100540.6A patent/CN105591353B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3566201B2 (en) * | 2000-11-10 | 2004-09-15 | シャープ株式会社 | Chopper type regulator |
| CN1466255A (en) * | 2002-06-29 | 2004-01-07 | 深圳市中兴通讯股份有限公司 | Output overcurrent and short circuit protector for high power contravariant equipment |
| CN1852115A (en) * | 2005-09-30 | 2006-10-25 | 华为技术有限公司 | Power-supply control method and apparatus |
| CN102629751A (en) * | 2012-04-26 | 2012-08-08 | 深圳市汉拓数码有限公司 | Over-current protection circuit |
| CN105140890A (en) * | 2015-09-28 | 2015-12-09 | 苏州华兴源创电子科技有限公司 | Steady-state over-voltage protection system |
| CN205407214U (en) * | 2016-02-24 | 2016-07-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Drive current foldback circuit with function is swung in antivibration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115694323A (en) * | 2022-10-11 | 2023-02-03 | 西安电子工程研究所 | Stable tracker locking control method with two-stage overcurrent protection |
| CN115694323B (en) * | 2022-10-11 | 2024-03-22 | 西安电子工程研究所 | Stable tracker locking control method with two-stage overcurrent protection |
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| CN105591353B (en) | 2018-11-16 |
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Effective date of registration: 20230710 Address after: No. 2016, Tanghe Road, economic development zone, Bengbu City, Anhui Province 233030 Patentee after: 214 INSTITUTE OF CHINA NORTH INDUSTRIES GROUP Address before: 215163 No. 89 Longshan Road, hi tech Zone, Suzhou, Jiangsu Patentee before: Suzhou R & D center of 214 Institute of China North Industries Group |