CN103545792B - inverter over-current protection circuit and method based on ACS710 - Google Patents
inverter over-current protection circuit and method based on ACS710 Download PDFInfo
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Abstract
The invention discloses a kind of inverter over-current protection circuit based on ACS710 and method, this circuit includes converter, fault pull-up resistor, enables pull-up resistor, for the first comparator that the actuation voltage of chip over current fault foot and reference voltage level are compared, be used for flowing to the second comparator of line level upset protection, the 11st resistance, the 4th electric capacity, audion, stabilivolt and hardware lockout electronic circuit to crossing.A kind of hardware current foldback circuit of over-current signal design of the over current fault foot of ACS710 Hall of the present invention; the output making converter increases one-level short circuit priority protection circuit; this circuit protection signal is fed directly to hardware lockout electronic circuit without CPU process will drive pwm signal shielding; the time delay of this circuit only has the fault detect time delay of ACS710 and the upset time delay of the second comparator; the time delay response time of whole circuit, within 5us, thoroughly eliminates the short-circuit protection of traditional circuit shortcoming not in time.
Description
Technical field
The present invention relates to field of power electronics, particularly relate to a kind of inverter over-current protection circuit based on ACS710 and method.
Background technology
Present stage, in converter industry, the protection of weak machine short circuit overcurrent often uses following two scheme；Scheme 1: current detection circuit does current detecting and short-circuit protection；Add amplifying circuit after current signal device after testing (Hall, current sense resistor etc.) to send again and CPU process with filter circuit.Current sensing device, amplifying circuit, filter circuit and CPU process that all unavoidably to there is time delay, particularly weak machine amplification relatively big and when filter effect requirement is higher, and the response time of this resolution circuitry is at more than 10us.During inverter output short-circuit, immediate current is several times or even the decades of times of IGBT nominal rating electric current, and the ability of resistance to ten times of rated current of IBGT is within 10us, and this causes that converter IGBT when short circuit very easily lost efficacy.Scheme 2: increase current detection circuit on bus；This scheme works is obvious, however it is necessary that increase linear optical coupling does and isolates, the development trend little with weak machine volume, cost is low against.
Summary of the invention
For the weak point existed in above-mentioned technology, the present invention provides a kind of simple in construction, reasonable in design, reliability is high, cost is low and work efficiency the is high inverter over-current protection circuit based on ACS710 and method.
For achieving the above object; the present invention provides a kind of inverter over-current protection circuit based on ACS710, including connecting the over-current detection chip ACS710 of converter, fault pull-up resistor, enable pull-up resistor, for the first comparator that the actuation voltage of chip over current fault foot and reference voltage level are compared, be used for crossing stream and carry out the second comparator of high level upset protection, being used for protecting the peripheral electronic circuit of the second comparator, the 11st resistance, the 4th electric capacity, audion, stabilivolt and hardware lockout electronic circuit；Described fault pull-up resistor is connected with chip over current fault foot and is pulled up; described enable pull-up resistor is crossed stream enable foot and is connected and is pulled up with chip; and the in-phase input end of described chip over current fault foot and the first comparator connects; the inverting input of described first comparator connects the in-phase input end of reference voltage source and its outfan and the second comparator and connects; the inverting input of described second comparator connects the peripheral electronic circuit for protecting the second comparator, and the outfan of described second comparator connects SC signal end；Described chip is crossed stream and is enabled the emitter stage of foot connecting triode, described 11st resistance one end connects SC signal end, the described 11st resistance other end connects one end of the 4th electric capacity, and the other end ground connection of described 4th electric capacity, the grounded collector of described audion, and the common port of described 11st resistance and the 4th electric capacity is connected with the base stage of audion by stabilivolt, described SC signal end is connected with hardware lockout electronic circuit.
Wherein, this current foldback circuit also includes crossing the first electric capacity of stream enable foot filtering for chip, arranging the second electric capacity of delay time for chip over current fault foot and arranged the second resistance and the 4th resistance of flow point resistance for converter；One end of described first electric capacity is crossed stream enable foot respectively and is connected with the first resistance and chip, the other end ground connection of described first electric capacity, one end of described second electric capacity is connected with the 3rd resistance and chip over current fault foot respectively, the other end ground connection of described second electric capacity, described second resistance and the 4th resistant series and its common port are connected with over-current detection chip ACS710.
Wherein, this current foldback circuit also includes the 7th resistance being connected between the first comparator inverting input and reference voltage source; described 7th resistance is also by the 15th resistance eutral grounding, and the outfan of described first comparator is connected by the in-phase input end of the 5th resistance and the second comparator.
Wherein, described peripheral electronic circuit includes the 6th resistance, the 8th resistance and by clamped for SC signal end the first diode between 0-5V and the second diode, the inverting input of described second comparator is connected by the 6th resistance and the 8th resistance, and the common port of described 6th resistance and the 8th resistance connects the outfan of the second comparator, described first diode and the second Diode series, and first diode and the second diode common port and the outfan of the second comparator connect, the plus earth of described second diode.
Wherein, this current foldback circuit also includes and the tenth resistance of the 4th Capacitance parallel connection, and one end of described tenth resistance connects stabilivolt, the other end ground connection of described tenth resistance.
For achieving the above object, the present invention also provides for a kind of converter over-current protection method based on ACS710, comprises the following steps:
Step A, utilize over-current detection chip ACS710 detect converter output electric current, during output overcurrent, chip over current fault foot output voltage；
Step B, over-current detection chip ACS710 internal current source start the voltage of drop-down chip over current fault foot, are pulled down to protection voltage setting value, and comparator overturns, and SC signal transfers low level to；
PWM is driven shielding by step C, SC signal trigger hardware block electronic circuit；
Step E, converter output short-circuit release, and chip over current fault foot starts to charge up reset；
Step F, converter carry out normal operation.
Wherein, also including a step D, described step D before described step E is: converter output short-circuit does not release, and chip is crossed stream enable foot and carried out being pulled down to the releasing of converter output short-circuit.
Wherein, in described step B, the pull-down capability of over-current detection chip ACS710 internal current source is 3mA, and protection voltage setting value is 2V.
Compared with prior art, the inverter over-current protection circuit based on ACS710 provided by the invention and method, have the advantages that
1) over-current detection chip ACS710 internal current source starts the voltage of drop-down chip over current fault foot; when being pulled down to protection voltage setting value; comparator overturns; SC signal transfers low level to; PWM is driven shielding by SC signal low level trigger hardware block electronic circuit; realize short circuit priority protection, and chip is crossed stream enable foot and is also pulled down to low level until converter output short-circuit releases；Meanwhile, after output short-circuit releases, converter also can carry out normal reset；
2) a kind of hardware current foldback circuit of over-current signal design of the over current fault foot of ACS710 Hall has been used in this invention cleverly, the output making converter increases one-level short circuit priority protection circuit, this circuit protection signal is fed directly to hardware lockout electronic circuit without CPU process will drive pwm signal shielding, the time delay of this current foldback circuit only has the fault output time delay of ACS710 and the upset time delay of the second comparator, comparator response time is substantially all between tens of to hundreds of nanoseconds, the fault output time delay of ACS710 is in 2-4us, therefore the time delay response time of whole circuit is within 5us, thoroughly eliminate the short-circuit protection of traditional circuit shortcoming not in time, substantially increase the reliability of IGBT；
3) electric circuit inspection realizes 1ms delay time after over current fault signal, then send to ACS710 and enable signal, substantially increase the stability of converter work, and there is simple in construction, the feature such as reasonable in design, cost is low, working stability, reliability are high and speed is fast.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the inverter over-current protection circuit based on ACS710 of the present invention；
Fig. 2 is the workflow diagram of the converter over-current protection method based on ACS710 of the present invention；
Fig. 3 is the test waveform figure that conventional art is applied to AC70E series weak machine；
Fig. 4 is the test waveform figure that the present invention is applied to AC70E series weak machine.
Detailed description of the invention
In order to more clearly state the present invention, below in conjunction with accompanying drawing, the present invention is further described.
Refer to Fig. 1; the inverter over-current protection circuit based on ACS710 of the present invention, including connecting the over-current detection chip ACS710U2 of converter, fault pull-up resistor R3, enable pull-up resistor R1, for the first comparator U1-A that the actuation voltage of chip over current fault foot and reference voltage level are compared, be used for crossing stream and carry out the second comparator U1-B of high level upset protection, being used for protecting the peripheral electronic circuit of the second comparator U1-B, the 11st resistance R11, the 4th electric capacity C4, audion Q4, stabilivolt Z3 and hardware lockout electronic circuit (not shown)；Fault pull-up resistor R3 is connected with chip over current fault foot FAULT and is pulled up, and enables pull-up resistor R1 and crosses stream enable foot FAULT with chip--EN connects and is pulled up; and the in-phase input end of chip over current fault foot FAULT and the first comparator U1-A connects; the inverting input of the first comparator U1-A connects the in-phase input end of reference voltage source VREF and its outfan and the second comparator U1-B and connects; the inverting input of the second comparator U1-B connects the peripheral electronic circuit for protecting the second comparator U1-B, and the outfan of the second comparator U1-B connects SC signal end；Chip is crossed stream and is enabled foot FAULT--The emitter stage of EN connecting triode Q4,11st resistance R11 one end connects SC signal end, the 11st resistance R11 other end connects one end of the 4th electric capacity C4, and the 4th other end ground connection GND of electric capacity C4, the grounded collector GND of audion Q4, and the 11st the common port of resistance R11 and the four electric capacity C4 be connected by the base stage of stabilivolt Z3 and audion Q4, SC signal end is connected with hardware lockout electronic circuit.
Further referring to Fig. 2, the present invention also provides for a kind of converter over-current protection method based on ACS710, comprises the following steps:
S1, utilize over-current detection chip ACS710 detect converter output electric current, during output overcurrent, chip over current fault foot output voltage.
S2, over-current detection chip ACS710 internal current source start the voltage of drop-down chip over current fault foot, are pulled down to protection voltage setting value, and this protection voltage setting value is 2V, and comparator overturns, and SC signal transfers low level to.
PWM is driven shielding by S3, SC signal trigger hardware block electronic circuit, thus realizing short circuit priority protection.
Whether S4, detection converter output short-circuit release, if converter output short-circuit releases, then start to perform step S5, if do not released, then perform step S6: chip is crossed stream and enabled foot and carry out being pulled down to after converter output short-circuit releases, and starts to perform step S7.
S6, converter output short-circuit release, and chip over current fault foot starts to charge up reset；
S7, converter carry out normal operation.
According to the converter over-current protection method based on ACS710 provided by the invention, the circuit workflow methods of the present invention is described in detail:
The first step, utilizes over-current detection chip ACS710U2 to detect the output electric current of converter, during output overcurrent, and chip over current fault foot FAULT output voltage.
Second step; over-current detection chip ACS710U2 internal current source starts the voltage of drop-down chip over current fault foot FAULT; and the reference voltage of reference voltage source VREF in drop-down voltage and the first comparator U1-A is compared; when being pulled down to protection voltage setting value; namely, time identical with reference voltage, the second comparator U1-B output level is low level by high level upset, and SC signal transfers low level to; the ability of pull-down current is 3mA, and protection voltage setting value is 2V.
3rd step, PWM is driven shielding by SC signal low level trigger hardware block electronic circuit, thus realizing short circuit priority protection.
SC signal saltus step in 4th step, above-mentioned 3rd step is after low level, and audion Q4 turns on, and chip is crossed stream and enabled foot FAULT--EN is pulled down to low level；Specific works in this step is that after SC signal saltus step is low level, the 4th electric capacity C4 discharges through the 11st resistance R11, and after being discharged to Vc=5-VZ3-Vf, audion Q4 turns on, and makes chip cross stream and enables foot FAULT--EN is pulled down to low level, here VZ3For the breakdown voltage of stabilivolt Z3, VfPN junction pressure drop for audion Q4.
Whether the 5th step, converter output short-circuit release, if converter output short-circuit releases, then start to perform step the eight step, if do not released, then perform the 6th step: chip over current fault foot FAULT is low level, and SC signal is low level, audion chip is crossed stream and enable foot FAULT--EN carries out being pulled down to after converter output short-circuit releases, and starts to perform step the seven step.
7th step, chip over current fault foot FAULT start to charge up reset, and it is charged by the current source for 3mA.
8th step, chip over current fault foot FAULT voltage are higher than after protection voltage setting value, and the output low level upset of the second comparator U1-B is high level, and SC signal is 5V, and hardware lockout electronic circuit triggering level is invalid, and converter carries out normal operation.
9th step, SC signal are charged to the 4th electric capacity C4 by the 11st resistance R11, and the 4th electric capacity C4 charges to Vc=5-VZ3-VfAfter, audion Q4 crosses stream by, chip and enables foot FAULT--EN is pulled to 5V.
In the present embodiment, this current foldback circuit also includes crossing stream enable foot FAULT for chip--EN filtering the first electric capacity C1, the second electric capacity C2 of delay time is set for chip over current fault foot FAULT and the second resistance R2 and the 4th resistance R4 of flow point resistance was set for converter；One end of first electric capacity C1 is crossed stream enable foot FAULT--EN respectively and is connected with the first resistance R1 and chip, the other end ground connection GND of the first electric capacity C1, one end of second electric capacity C2 is connected with the 3rd resistance R3 and chip over current fault foot FAULT respectively, the other end ground connection GND of the second electric capacity C2, the second resistance R2 and the four resistance R4 series connection and its common port are connected with over-current detection chip ACS710U2.The time delay computing formula of the second electric capacity C2: Tr=C2* (VCC-2)/3mA, it is VOC:0.25VCC-0.4VCC that the mistake flow point of the second resistance R2 and the four resistance R4 arranges resistance.
In the present embodiment; this current foldback circuit also includes the 7th resistance R7 being connected between the first comparator U1-A inverting input and reference voltage source VREF; 7th resistance R7 is also by the 15th resistance R15 ground connection GND, and the outfan of the first comparator U1-A is connected by the in-phase input end of the 5th resistance R5 and the second comparator U1-B.Peripheral electronic circuit includes the 6th resistance R6, the 8th resistance R8 and by clamped for SC signal end the first diode D1 between 0-5V and the second diode D2, the inverting input of the second comparator U1-B is connected by the 6th resistance R6 and the eight resistance R8, and the 6th the common port of resistance R6 and the eight resistance R8 connect the outfan of the second comparator U1-B, first diode D1 and the second diode D2 series connection, and first diode D1 and the second diode D2 common port and the second comparator U1-B outfan connect, the plus earth GND of the second diode D2.Circuit also includes the tenth resistance R10 in parallel for electric capacity C4 with the 4th, and one end of the tenth resistance R10 connects the other end ground connection GND of stabilivolt Z3, the tenth resistance R10.The negative pole of the 8th resistance R8 and the first diode D1 is all connected with 5V voltage, and the tenth resistance R10 and stabilivolt Z3 can effectively keep the voltage of audion Q4, can prevent punch-through.
Further referring to Fig. 3-4, Fig. 3 is the test result of traditional scheme, and A channel is SC hardware lockout signal, and channel B is short circuit current signal, as we know from the figure short circuit time delay 12.1us.Fig. 4 is the test result after this programme circuit, and C-channel is SC hardware lockout signal, and D passage is short circuit current signal, as we know from the figure short circuit time delay 3.22us.From test result it can be seen that the short-circuit response time of this programme is extremely short, only 3.22us, IGBT can be effectively protected when exporting phase fault or short circuit relative to the earth at inverter, substantially increase the reliability of converter.
Inverter over-current protection circuit based on ACS710 provided by the invention and method, have the advantage that
1) over-current detection chip ACS710U2 is utilized to detect the output electric current of converter; during output overcurrent, chip over current fault foot FAULT output voltage, PWM is driven shielding by SC signal low level trigger hardware block electronic circuit; realize short circuit priority protection, and chip is crossed stream and enabled foot FAULT--EN is also pulled down to low level until converter output short-circuit releases；Meanwhile, after output short-circuit releases, converter also can carry out normal reset.
2) a kind of hardware current foldback circuit of over-current signal design of the over current fault foot of ACS710 Hall has been used in this invention cleverly, the output making converter increases one-level short circuit priority protection circuit, this circuit protection signal is fed directly to hardware lockout electronic circuit without CPU process will drive pwm signal shielding, the time delay of this current foldback circuit only has the fault output time delay of ACS710 and the upset time delay of the second comparator, comparator response time is substantially all between tens of to hundreds of nanoseconds, the output time delay of ACS710 fault is in 2-4us, therefore the time delay response time of whole circuit is within 5us, thoroughly eliminate the short-circuit protection of traditional circuit shortcoming not in time, substantially increase the reliability of IGBT；
3) electric circuit inspection realizes 1ms delay time after over current fault signal, then send to ACS710 and enable signal, substantially increase the stability of converter work, and there is simple in construction, the feature such as reasonable in design, cost is low, working stability, reliability are high and speed is fast.
The several specific embodiments being only the present invention disclosed above, but the present invention is not limited to this, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (7)
1. the inverter over-current protection circuit based on ACS710; it is characterized in that, including connecting the over-current detection chip ACS710 of converter, fault pull-up resistor, enable pull-up resistor, for the first comparator that the actuation voltage of chip over current fault foot and reference voltage level are compared, be used for crossing stream and carry out the second comparator of high level upset protection, being used for protecting the peripheral electronic circuit of the second comparator, the 11st resistance, the 4th electric capacity, audion, stabilivolt and hardware lockout electronic circuit；Described fault pull-up resistor is connected with chip over current fault foot and is pulled up; described enable pull-up resistor is crossed stream enable foot and is connected and is pulled up with chip; and the in-phase input end of described chip over current fault foot and the first comparator connects; the inverting input of described first comparator connects the in-phase input end of reference voltage source and its outfan and the second comparator and connects; the inverting input of described second comparator connects the peripheral electronic circuit for protecting the second comparator, and the outfan of described second comparator connects SC signal end；Described chip is crossed stream and is enabled the emitter stage of foot connecting triode, described 11st resistance one end connects SC signal end, the described 11st resistance other end connects one end of the 4th electric capacity, and the other end ground connection of described 4th electric capacity, the grounded collector of described audion, and the common port of described 11st resistance and the 4th electric capacity is connected with the base stage of audion by stabilivolt, described SC signal end is connected with hardware lockout electronic circuit.
2. the inverter over-current protection circuit based on ACS710 according to claim 1; it is characterized in that, this current foldback circuit also includes crossing stream for chip and enables the first electric capacity of foot filtering, arrange the second electric capacity of delay time for chip over current fault foot and arranged the second resistance and the 4th resistance of flow point resistance for converter；One end of described first electric capacity is crossed stream enable foot respectively and is connected with one end of the first resistance and chip, the other end ground connection of described first electric capacity, one end of described second electric capacity is connected with one end of the 3rd resistance and chip over current fault foot respectively, the other end ground connection of described second electric capacity, the common port that one end of described second resistance and one end of the 4th resistance connect is connected with over-current detection chip ACS710, the other end ground connection of described 4th resistance, and the other end of described first resistance, the other end of the second resistance and the other end of the 3rd resistance are all connected with over-current detection chip ACS710.
3. the inverter over-current protection circuit based on ACS710 according to claim 1 and 2; it is characterized in that; this current foldback circuit also includes the 7th resistance being connected between the first comparator inverting input and reference voltage source; one end of described 7th resistance is connected with reference voltage source; the other end of described 7th resistance passes through the 15th resistance eutral grounding, and the outfan of described first comparator is connected by the in-phase input end of the 5th resistance and the second comparator.
4. the inverter over-current protection circuit based on ACS710 according to claim 3, it is characterized in that, described peripheral electronic circuit includes the 6th resistance, 8th resistance and by clamped for SC signal end the first diode between 0-5V and the second diode, the inverting input of described second comparator is connected by one end of the 6th resistance and the 8th resistance, the other end of described 8th resistance connects 5V, and the outfan connection of the common port that connects of one end of described 6th resistance and the 8th resistance and the second comparator, the negative pole of described first diode connects 5V, the positive pole of described first diode and the negative pole of the second diode connect, and the outfan of the positive pole of described first diode and the second comparator connects, the plus earth of described second diode.
5. the inverter over-current protection circuit based on ACS710 according to claim 4; it is characterized in that; this current foldback circuit also includes and the tenth resistance of the 4th Capacitance parallel connection, and one end of described tenth resistance connects stabilivolt, the other end ground connection of described tenth resistance.
6. the converter over-current protection method based on ACS710, it is characterised in that comprise the following steps: step A, utilize over-current detection chip ACS710 detect converter output electric current, during output overcurrent, chip over current fault foot output voltage；Step B, over-current detection chip ACS710 internal current source start the voltage of drop-down chip over current fault foot, are pulled down to protection voltage setting value, and comparator overturns, and SC signal transfers low level to；PWM is driven shielding by step C, SC signal trigger hardware block electronic circuit；Whether step D, detection converter output short-circuit release, if converter output short-circuit releases, then start to perform step E, if do not released, then chip is crossed stream and enabled foot and carry out being pulled down to after converter output short-circuit releases, and starts to perform step F；Step E, converter output short-circuit release, and chip over current fault foot starts to charge up reset；Step F, converter carry out normal operation.
7. the converter over-current protection method based on ACS710 according to claim 6, it is characterised in that in described step B, the pull-down capability of over-current detection chip ACS710 internal current source is 3mA, and protection voltage setting value is 2V.
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| CN104037722A (en) * | 2014-06-18 | 2014-09-10 | 中国航天科技集团公司第九研究院第七七一研究所 | Safety circuit based on load over-current fault |
| CN104731016A (en) * | 2015-03-18 | 2015-06-24 | 安徽马钢自动化信息技术有限公司 | Control method for accurate positioning of alternating current motor |
| CN104865867B (en) * | 2015-03-23 | 2017-09-19 | 四川长虹电器股份有限公司 | A kind of repositioning method of reset circuit |
| CN108574462B (en) * | 2018-01-31 | 2021-03-26 | 中兴通讯股份有限公司 | Protection circuit and circuit protection method |
| CN108599110A (en) * | 2018-01-31 | 2018-09-28 | 广东美的制冷设备有限公司 | Over-current protection method, circuit and the electrical equipment of intelligent power module |
| CN112072616B (en) * | 2020-09-02 | 2021-09-14 | 珠海格力电器股份有限公司 | IPM over-current detection circuit and electric appliance |
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Effective date of registration: 20181123 Address after: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee after: SUZHOU WEICHUANG ELECTRICAL EQUIPMENT TECHNOLOGY CO., LTD. Address before: 518000 Baoan District Shiyan street, Shenzhen, Guangdong Province, the third phase of the two phase Industrial Zone, C Patentee before: Flextronics Shenzhen City Electric Co,, Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee after: Suzhou Weichuang Electrical Technology Co., Ltd. Address before: 215000 No. 1000 Songhua Road, Guo Xiang street, Wuzhong Economic and Technological Development Zone, Suzhou, Jiangsu Patentee before: SUZHOU WEICHUANG ELECTRICAL EQUIPMENT TECHNOLOGY CO., LTD. |