CN205407214U - Drive current foldback circuit with function is swung in antivibration - Google Patents
Drive current foldback circuit with function is swung in antivibration Download PDFInfo
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- CN205407214U CN205407214U CN201620137939.7U CN201620137939U CN205407214U CN 205407214 U CN205407214 U CN 205407214U CN 201620137939 U CN201620137939 U CN 201620137939U CN 205407214 U CN205407214 U CN 205407214U
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Abstract
The utility model discloses a drive current foldback circuit with function is swung in antivibration works as drive current and appears overflowing, and a comparator output becomes the low level by the high level, realizes through peripheral resistance -capacitance device that the level is comparatively slow by high step -down process, avoids the shake to lead to the fact the mistake to protect the phenomenon to appear, when a comparator output level was less than second comparator voltage ratio and puts, the 2nd comparator output became the low level rapidly by the high level, realizes that drive current turn -offs rapidly to protection driver chip and oading equipment, while should be broken off by low level trigger CPU, and CPU sent driver chip closed signals after receiving interrupt signal, and after wait no. 1 was fixed time, CPU sent driver chip enabling signal, driver chip resume work. If the drive overflows not to be relieved for a long time, behind several overcurrent protection, the work of the thorough stop driving chip of CPU has effectively been solved and has been caused driver chip and load damage phenomenon because of overflowing.
Description
Technical field
This utility model belongs to electronics field, is a kind of driving current foldback circuit with anti-oscillation functions, can be applicable to, in the multiple circuit that need to drive overcurrent protection, especially duplicate in the short time in the motor-drive circuit of over-current phenomenon avoidance.
Background technology
The current similar many employings of protection circuit are had the hiccups formula overcurrent protection measure; when there is stream in driving chip; before over-current state releases, driving chip is in startups all the time, protect, in the circulation restarted, and time length is understood cause damage to load equipment and driving chip.
Utility model content
The purpose of this utility model is in that to provide a kind of current foldback circuit with anti-oscillation functions, solves the damage problem caused because electrical equipment repeated stream while providing overcurrent protection to electrical equipment.
The technical solution of the utility model:
A kind of driving current foldback circuit with anti-oscillation functions, is characterized in that, including two-stage voltage-regulating circuit and driving chip cut-off signals control circuit；
Two-stage voltage-regulating circuit mainly includes the first comparator and the second comparator；
Driving a current through the first resistance sampling and become sampled voltage signal, sampled voltage is input to the negative input end of the first comparator through the second resistance；Voltage after 3rd resistance and the right+5V power supply dividing potential drop of the 4th resistance is input to the positive input terminal of the first comparator as benchmark voltage；
The outfan of the first comparator connects 5V voltage through the 5th resistance；The outfan of the first comparator is simultaneously connected to the positive input terminal of the second comparator；
6th resistance and the 7th resistance will input the second comparator as two grades of reference voltages compared negative input end after+5V power supply dividing potential drop；
Driving chip cut-off signals control circuit mainly includes audion and CPU；
The base stage that the driving overcurrent signal PT of the outfan output of the second comparator is simultaneously entered to CPU and audion, the control end of CPU sends over-current detection State-output control signal MS and is input to the SD control end of driving chip, and over-current signal PT outputs a control signal to the SD of driving chip and controls end by controlling the unlatching of audion.
The second electric capacity it is connected, it is achieved the Filtering Processing to sampled voltage signal between the negative input end of the first comparator and ground.
The 4th electric capacity it is connected, it is achieved to the Filtering Processing comparing reference voltage between the positive input terminal of the first comparator and ground.
The 3rd electric capacity is connected, for being integrated comparison signal processing between outfan and the positive input terminal of the first comparator.
The first order also simultaneously through the 5th capacity earth, is compared output and is filtered by the outfan of the first comparator.
The first electric capacity is connected between the power end of the first comparator and the earth terminal of the first comparator.
The source electrode of audion is connected with+5V power supply.
The base stage of audion is connected with+5V power supply through the 9th resistance, provides the upper pull-up voltage of+5V for audion.
This utility model mainly utilizes two comparators and the peripheral capacitance resistance ware composition overcurrent protection sample circuit of part; when driving electric current, stream occurred; the output of first order comparator is become low level from high level; level is realized comparatively slow by high step-down process, it is to avoid shake causes protection phenomenon by mistake to occur by peripheral capacitance resistance ware.When first order comparator output level is lower than second level comparator voltage comparison point, comparator output in the second level is rapidly gone to low level by high level, and this low level realizes driving chip and turns off rapidly, protects driving chip and load equipment；This low level triggers CPU interruption simultaneously, after CPU receives interrupt signal, sends driving chip shutdown signal, and after waiting certain time, CPU sends driving chip enabling signal, and driving chip is resumed work.If driving chip is crossed stream and do not released for a long time, after overcurrent protection several times, CPU thoroughly stops driving chip work; only solve over current fault problem; re-powering, driving chip could recover normal operation, efficiently solves because stream causes driving chip and load to damage phenomenon excessively.
Current foldback circuit of the present utility model was when stream occurred in driving chip; stopped immediately by hardware driving signal output; over-current signal is sent to CPU simultaneously; after CPU receives over-current signal, output level remains turned-off the state driving signal; could output drive signal again after the time set; if now over-current phenomenon avoidance releases, then driving chip recovers normal operation；If over-current phenomenon avoidance does not release, then repeat overcurrent protection process.If being repeated several times by overcurrent protection process, over-current phenomenon avoidance releases not yet, and CPU can thoroughly stop driving chip work; only solve over current fault problem; re-powering, driving chip could recover normal operation, efficiently solves because stream causes driving chip and load to damage phenomenon excessively.
This utility model has some novelty following:
When 1, there is overcurrent protection, being closed driving output immediately by hardware, CPU receives over-current signal simultaneously, sends and close drive output signal after software processes, recovers driving chip work after keeping certain time；
2, protection circuit has anti-oscillation functions；
3, when over-current phenomenon avoidance is always maintained at, protection circuit realiration driving chip is thoroughly closed, and after only over current fault releases, re-powers, and driving chip could recover normal operation, efficiently solves because crossing the phenomenon that stream causes driving chip and load to damage.
Accompanying drawing explanation
Fig. 1 has anti-oscillation functions current foldback circuit schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is further described.Following example are only for clearly illustrating the technical solution of the utility model, and can not limit protection domain of the present utility model with this.
As shown in Figure 1: be the current foldback circuit schematic diagram with anti-vibration defencive function shown in figure.This circuit is specifically divided into two parts: the two-stage voltage-regulating circuit with over-current detection function and the driving chip cut-off signals control circuit with anti-oscillation functions.
Two-stage voltage-regulating circuit includes comparator U1, comparator U2, resistance R1, R2, R3, R4, R5, R6, R7 and electric capacity C1, C2, C3, C4, C5, C6.
Driving a current through resistance R1 sampling and become sampled voltage signal, sampled voltage is input to the 2nd foot negative input end of comparator U1 through resistance R2, and electric capacity C2 is connected to the 2nd foot negative input end of U1 and realizes the Filtering Processing to sampled voltage signal.Resistance R3 and R4 realizes the voltage division processing of right+5V voltage, voltage after resistance R3 and R4 dividing potential drop is input to the 3rd foot positive input terminal of U1 as benchmark voltage, electric capacity C4 is connected to the 3rd foot positive input terminal of U1 and realizes the Filtering Processing comparing reference voltage, electric capacity C3 is connected between the 1st foot outfan and the 3rd foot positive input terminal of U1, for being integrated comparison signal processing.Resistance R5 and electric capacity C5 is connected to the 1st foot outfan of U1 to be provided the upper pull-up voltage of 5V for comparing output and the first order is compared output is filtered, and the first order is compared and exports the 5th foot positive input terminal being connected to comparator U2 by the 1st foot outfan of comparator U1.+ 5V power supply is carried out voltage division processing by resistance R6, R7, electric capacity C6 and filtering accesses the 6th foot negative input end of comparator U2 as two grades of reference voltages compared.Electric capacity C1 is connected between the 8 foot power ends of comparator U1 and 4 foot earth terminals and is filtered processing to the voltage of comparator.
Driving chip cut-off signals control circuit includes audion Q1, CPU and resistance R8, R9, R10, R11.
Overcurrent signal PT is driven to be input to CPU by the 7th foot outfan of comparator U2, and accessed the base stage of audion Q1 by resistance R8 simultaneously, the base stage that resistance R9 is audion Q1 provides pull-up voltage on 5V, the control end of CPU sends over-current detection State-output control signal MS(hereinafter referred to as CPU control signal MS) and by resistance R10 be input to driving chip SD control end, the control end that resistance R11 is CPU provides pull-up voltage on 5V, and over-current signal PT outputs a control signal to the SD of driving chip and controls end by controlling the unlatching of audion Q1.
When there is stream, comparator U1 outfan level is become low level from high level, and electric capacity C3, C5 make high level become the low level time to be slowed by, it is to avoid because shake occurs protecting phenomenon by mistake.When comparator U1 output level gets lower than+5V* [R7/ (R6+R7)], the output of comparator U2 is become low level from high level, and now driving chip control signal SD becomes high level, and driving chip is closed rapidly；The low level signal of comparator U2 output simultaneously triggers CPU to interrupt, and the CPU control signal MS sent is become high level from low level after processing interrupt signal by CPU.Owing to closing driving chip, over-current state is cancelled, audion Q1 turns off again, driving chip control signal SD no longer plays closedown driving chip effect, now CPU control signal MS continues to make driving chip be closed, waiting certain time, CPU control signal MS is become low level from high level by CPU, and driving chip is reworked.If now over-current phenomenon avoidance releases, then driving chip recovers normal operation；If over-current phenomenon avoidance does not release, then repeat overcurrent protection process；If being repeated several times by overcurrent protection process, over-current phenomenon avoidance releases not yet, and it is high level that CPU will be always maintained at CPU control signal MS, thoroughly stops driving chip work.Only solving over current fault problem, re-power, driving chip could recover normal operation, efficiently solves because stream causes driving chip and load to damage phenomenon excessively.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the premise without departing from this utility model know-why; can also making some improvement and deformation, these improve and deformation also should be regarded as protection domain of the present utility model.
Claims (8)
1. there is a driving current foldback circuit for anti-oscillation functions, it is characterized in that, including two-stage voltage-regulating circuit and driving chip cut-off signals control circuit；
Two-stage voltage-regulating circuit mainly includes the first comparator and the second comparator；
Driving a current through the first resistance sampling and become sampled voltage signal, sampled voltage is input to the negative input end of the first comparator through the second resistance；Voltage after 3rd resistance and the right+5V power supply dividing potential drop of the 4th resistance is input to the positive input terminal of the first comparator as benchmark voltage；
The outfan of the first comparator connects 5V voltage through the 5th resistance；The outfan of the first comparator is simultaneously connected to the positive input terminal of the second comparator；
6th resistance and the 7th resistance will input the second comparator as two grades of reference voltages compared negative input end after+5V power supply dividing potential drop；
Driving chip cut-off signals control circuit mainly includes audion and CPU；
The base stage that the driving overcurrent signal PT of the outfan output of the second comparator is simultaneously entered to CPU and audion, the control end of CPU sends over-current detection State-output control signal MS and is input to the SD control end of driving chip, drives the overcurrent signal PT SD outputting a control signal to driving chip by controlling the unlatching of audion to control end.
2. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, be connected the second electric capacity between the negative input end of the first comparator and ground, it is achieved 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, be connected the 4th electric capacity between the positive input terminal of the first comparator and ground, it is achieved to the Filtering Processing comparing 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 between outfan and the positive input terminal of the first comparator, for being integrated comparison signal processing.
5. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, the first order also simultaneously through the 5th capacity earth, is compared output and is filtered by the outfan of the first comparator.
6. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, connect the first electric capacity between the power end of the first comparator and the earth terminal of the first comparator.
7. a kind of driving current foldback circuit with anti-oscillation functions according to claim 1, is characterized in that, the source electrode of audion 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 audion is connected with+5V power supply through the 9th resistance, provides the upper pull-up voltage of+5V for audion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620137939.7U CN205407214U (en) | 2016-02-24 | 2016-02-24 | Drive current foldback circuit with function is swung in antivibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620137939.7U CN205407214U (en) | 2016-02-24 | 2016-02-24 | Drive current foldback circuit with function is swung in antivibration |
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| Publication Number | Publication Date |
|---|---|
| CN205407214U true CN205407214U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620137939.7U Expired - Fee Related CN205407214U (en) | 2016-02-24 | 2016-02-24 | Drive current foldback circuit with function is swung in antivibration |
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| CN (1) | CN205407214U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591353A (en) * | 2016-02-24 | 2016-05-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Driving overcurrent protection circuit having anti-oscillation function |
| CN116960891A (en) * | 2023-07-31 | 2023-10-27 | 苏州东菱振动试验仪器有限公司 | Short-circuit protection circuit of vibrating table |
-
2016
- 2016-02-24 CN CN201620137939.7U patent/CN205407214U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591353A (en) * | 2016-02-24 | 2016-05-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Driving overcurrent protection circuit having anti-oscillation function |
| CN116960891A (en) * | 2023-07-31 | 2023-10-27 | 苏州东菱振动试验仪器有限公司 | Short-circuit protection circuit of vibrating table |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20190224 |