CN103545792A - ACS710 based frequency converter overcurrent protection circuit and method - Google Patents
ACS710 based frequency converter overcurrent protection circuit and method Download PDFInfo
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Abstract
The invention discloses an ACS710 based frequency converter overcurrent protection circuit and method. The circuit comprises a frequency converter, a fault pull-up resistor, an enabling pull-up resistor, a first comparator, a second comparator, an eleventh resistor, a fourth resistor, a triode, a voltage stabilizing tube and a hardware lockout sub-circuit, wherein the first comparator is used for comparing pull-down voltage of a chip overcurrent fault pin with a reference voltage value, the second comparator is used for level overturn protection on overcurrent. The hardware overcurrent protection circuit is designed according to overcurrent signals of the overcurrent fault pin of an ACS710 Hall, so that a primary short-circuit priority protection circuit is added by output of the frequency converter, circuit protection signals are directly transmitted to the hardware lockout sub-circuit without being processed via a CPU (central processing unit) so as to shield drive PWM (pulse-width modulation) signals, delay of the circuit only includes ACS710 fault detection delay and overturn delay of the second comparator, delayed response time of the whole circuit is within 5us, and the shortcoming that a traditional circuit is not timely in short-circuit protection is eliminated thoroughly .
Description
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Technical field
The present invention relates to field of power electronics, relate in particular to a kind of frequency converter current foldback circuit and method based on ACS710.
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Background technology
Present stage, the following two schemes of the normal use of weak machine short circuit overcurrent protection in frequency converter industry; Scheme 1: current detection circuit is done current detecting and short-circuit protection; Current signal after testing device (Hall, current sense resistor etc.) adds afterwards amplifying circuit and filter circuit and send with CPU again and process.Current detecting device, amplifying circuit, filter circuit and CPU process while all unavoidably existing the large and filter effect of time delay, particularly weak machine multiplication factor to have relatively high expectations, and the response time of this scheme circuit is more than 10us.During inverter output short-circuit, immediate current is several times and 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 in 10us, and this causes frequency converter IGBT when short circuit very easily to lose efficacy.Scheme 2: increase current detection circuit on bus; This scheme successful, does and isolates but need to increase linear optical coupling, the development trend little with weak machine volume, cost is low against.
Summary of the invention
For the weak point existing in above-mentioned technology, the invention provides a kind of simple in structure, reasonable in design, reliability is high, cost is low and operating efficiency is high frequency converter current foldback circuit and method based on ACS710.
For achieving the above object, the invention provides a kind of frequency converter current foldback circuit based on ACS710, comprise connect frequency converter over-current detection chip, fault pull-up resistor, enable pull-up resistor, for the first comparator that the actuation voltage of chip over current fault pin and reference voltage level are compared, for overcurrent being carried out to the second comparator, the 11 resistance, the 4th electric capacity, triode, voltage-stabiliser tube and the hardware lockout electronic circuit of level upset protection; Described fault pull-up resistor is connected and will on it, draws with chip over current fault pin, described pull-up resistor and the chip overcurrent of enabling enables that pin is connected and will on it, draw, and described chip over current fault pin is connected with the in-phase input end of the first comparator, the inverting input of described the first comparator connects reference voltage source and its output is connected with the in-phase input end of the second comparator, and the output of described the second comparator connects SC signal; Described chip overcurrent enables the emitter of pin connecting triode, described the 11 resistance and the 4th Capacitance parallel connection, and the 4th electric capacity is attempted by between SC signal and ground, the grounded collector of described triode, and the common port of described the 11 resistance and the 4th electric capacity is connected with the base stage of triode by voltage-stabiliser tube, described SC signal is connected with hardware lockout electronic circuit.
Wherein, described circuit is also included as the first electric capacity that chip overcurrent enables pin filtering, the second electric capacity of delay time is set and the second resistance and the 4th resistance of flow point resistance was set for frequency converter for chip over current fault pin; One end of described the first electric capacity enables pin with the first resistance with chip overcurrent respectively and is connected, the other end ground connection of described the first electric capacity, one end of described the second electric capacity is connected with chip over current fault pin with the 3rd resistance respectively, the other end ground connection of described the second electric capacity, described the second resistance is connected with over-current detection chip with the 4th resistance series connection and its common port.
Wherein, described circuit also comprises the 7th resistance being connected between the first comparator inverting input and reference voltage source, described the 7th resistance is also by the 15 grounding through resistance, and the output of described the first comparator is connected with the in-phase input end of the second comparator by the 5th resistance.
Wherein, described circuit also comprises the peripheral electronic circuit for the protection of the second comparator, described peripheral electronic circuit comprises the 6th resistance, the 8th resistance and by clamped the first diode and the second diode between 0-5V of SC signal, the inverting input of described the second comparator is connected with the 8th resistance by the 6th resistance, and described the 6th resistance is connected the output of the second comparator with the common port of the 8th resistance, described the first diode and the series connection of the second diode, and the common port of the first diode and the second diode is connected with the output of the second comparator, the plus earth of described the second diode.
Wherein, described circuit also comprises the tenth resistance with the 4th Capacitance parallel connection, and one end of described the tenth resistance connects voltage-stabiliser tube, the other end ground connection of described the tenth resistance.
For achieving the above object, the present invention also provides a kind of frequency converter over-current protection method based on ACS710, comprises the following steps:
Steps A, utilize over-current detection chip ACS710 to detect the output current of frequency converter, during output overcurrent, chip over current fault pin output voltage;
Step B, over-current detection chip ACS710 internal current source start the voltage of drop-down chip over current fault pin, are pulled down to protection voltage setting value, comparator upset, and SC signal transfers low level to;
Step C, SC signal trigger hardware lockout electronic circuit by PWM driven shield;
Step e, frequency converter output short-circuit are removed, and chip over current fault pin starts charging and resets;
Step F, frequency converter work.
Wherein, also comprise a step D before described step e, described step D is: frequency converter output short-circuit is not removed, and chip overcurrent enables pin and is pulled down to the releasing of frequency 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, frequency converter current foldback circuit and the method based on ACS710 provided by the invention, has following beneficial effect:
1) over-current detection chip ACS710 internal current source starts the voltage of drop-down chip over current fault pin, while being pulled down to protection voltage setting value, comparator upset, SC signal transfers low level to, SC signal low level triggers hardware lockout electronic circuit by PWM driven shield, realize short circuit priority protection, and chip overcurrent enables, and pin is also pulled down to low level until frequency converter output short-circuit is removed; Meanwhile, after output short-circuit releasing, frequency converter also can normally reset;
2) this invention has used the over-current signal of the over current fault pin of ACS710 Hall to design a kind of hardware current foldback circuit cleverly, make the output of frequency converter increase one-level short circuit priority protection circuit, this circuit protection signal is directly delivered to hardware lockout electronic circuit without CPU processing will drive pwm signal shielding, the time delay of this circuit only has the fault output time delay of ACS710 and the upset time delay of the second comparator, the comparator response time substantially all tens of between hundreds of nanoseconds, the fault output time delay of ACS710 is in 2-4us, therefore the time delay response time of whole circuit is in 5us, the short-circuit protection of thoroughly having got rid of traditional circuit shortcoming not in time, greatly improved the reliability of IGBT,
3) electric circuit inspection realizes 1ms delay time after overcurrent fault-signal, then to ACS710, send enable signal, greatly improve the stability of frequency converter work, and there is simple in structure, reasonable in design, the feature such as cost is low, working stability, reliability is high and speed is fast.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the frequency converter current foldback circuit based on ACS710 of the present invention;
Fig. 2 is the workflow diagram of the frequency 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.
Embodiment
In order more clearly to explain the present invention, below in conjunction with accompanying drawing, the present invention is further described.
Refer to Fig. 1, frequency converter current foldback circuit based on ACS710 of the present invention, comprise connect frequency converter over-current detection chip U2, 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 pin and reference voltage level are compared, for overcurrent being carried out to the second comparator U1-B, the 11 resistance R 11, the 4th capacitor C 4, triode Q4, voltage-stabiliser tube Z3 and the hardware lockout electronic circuit (not shown) of level upset protection; Fault pull-up resistor R3 is connected and will on it, draws with chip over current fault pin FAULT, enables pull-up resistor R1 and chip overcurrent enables pin FAULT
--eN connects and will on it, draw, and chip over current fault pin FAULT is connected with the in-phase input end of the first comparator U1-A, the inverting input of the first comparator U1-A connects reference voltage source VREF and its output is connected with the in-phase input end of the second comparator U1-B, and the output of the second comparator U1-B connects SC signal; Chip overcurrent enables pin FAULT
--the emitter of EN connecting triode Q4, the 11 resistance R 11 is in parallel with the 4th capacitor C 4, and the 4th capacitor C 4 is attempted by between SC signal and ground GND, the grounded collector GND of triode Q4, and the common port of the 11 resistance R 11 and the 4th capacitor C 4 is connected with the base stage of triode Q4 by voltage-stabiliser tube Z3, SC signal is connected with hardware lockout electronic circuit.
Please further consult Fig. 2, the present invention also provides a kind of frequency converter over-current protection method based on ACS710, comprises the following steps:
S1, utilize over-current detection chip ACS710 to detect the output current of frequency converter, during output overcurrent, chip over current fault pin output voltage.
S2, over-current detection chip ACS710 internal current source start the voltage of drop-down chip over current fault pin, are pulled down to protection voltage setting value, and this protection voltage setting value is 2V, comparator upset, and SC signal transfers low level to.
S3, SC signal trigger hardware lockout electronic circuit by PWM driven shield, thereby realize short circuit priority protection.
Whether S4, detection frequency converter output short-circuit are removed, if frequency converter output short-circuit is removed, start to perform step S5, if do not removed, perform step S6: chip overcurrent enables pin and is pulled down to after the releasing of frequency converter output short-circuit, starts to perform step S7.
S6, frequency converter output short-circuit are removed, and chip over current fault pin starts charging and resets;
S7, frequency converter work.
According to the frequency converter over-current protection method based on ACS710 provided by the invention, circuit working flow and method of the present invention is described in detail:
The first step, utilizes over-current detection chip ACS710 U2 to detect the output current of frequency converter, during output overcurrent, and chip over current fault pin FAULT output voltage.
Second step; over-current detection chip ACS710 U2 internal current source starts the voltage of drop-down chip over current fault pin 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; when 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.
The 3rd step, SC signal low level triggers hardware lockout electronic circuit by PWM driven shield, thereby realizes short circuit priority protection.
After SC signal saltus step in the 4th step, above-mentioned the 3rd step is low level, triode Q4 conducting, chip overcurrent enables pin FAULT
--eN is pulled down to low level; At the specific works of this step, be that after the saltus step of SC signal is low level, the 4th capacitor C 4, through the 11 resistance R 11 electric discharges, is discharged to triode Q4 conducting after Vc=5-VZ3-Vf, make chip overcurrent enable pin FAULT
--eN is pulled down to low level, here V
z3for the puncture voltage of voltage-stabiliser tube Z3, V
fpN junction pressure drop for triode Q4.
Whether the 5th step, frequency converter output short-circuit are removed, if frequency converter output short-circuit is removed, start to perform step the 8th step, if do not removed, carry out the 6th step: chip over current fault pin FAULT is low level, and SC signal is low level, by triode, chip overcurrent is enabled to pin FAULT
--eN is pulled down to after the releasing of frequency converter output short-circuit, starts to perform step the 7th step.
The 7th step, chip over current fault pin FAULT start charging and reset, for the current source of 3mA charges to it.
The 8th step, chip over current fault pin FAULT voltage are higher than protecting after voltage setting value, and the upset of the output low level of the second comparator U1-B is high level, and SC signal is 5V, and hardware lockout electronic circuit triggering level is invalid, and frequency converter works.
The 9th step, SC signal are by the 11 resistance R 11 to the 4th capacitor C 4 chargings, and the 4th capacitor C 4 charges to Vc=5-V
z3-V
fafter, triode Q4 by, chip overcurrent enables pin FAULT
--eN is pulled to 5V.
In the present embodiment, circuit is also included as chip overcurrent and enables pin FAULT
--the first capacitor C 1 of EN filtering, the second capacitor C 2 of delay time is set and the second resistance R 2 and the 4th resistance R 4 of flow point resistance was set for frequency converter for chip over current fault pin FAULT; One end of the first capacitor C 1 enables pin FAULT--EN with the first resistance R 1 and chip overcurrent respectively and is connected, the other end ground connection GND of the first capacitor C 1, one end of the second capacitor C 2 is connected with chip over current fault pin FAULT with the 3rd resistance R 3 respectively, the other end ground connection GND of the second capacitor C 2, the second resistance R 2 is connected with over-current detection chip U2 with the 4th resistance R 4 series connection and its common port.The time delay computing formula of the second capacitor C 2: Tr=C2* (VCC-2)/3mA, it is VOC:0.25VCC-0.4VCC that the mistake flow point of the second resistance R 2 and the 4th resistance R 4 arranges resistance.
In the present embodiment, circuit also comprises the 7th resistance R 7 being connected between the first comparator U1-A inverting input and reference voltage source VREF, the 7th resistance R 7 is also by the 15 resistance R 15 ground connection GND, and the output of the first comparator U1-A is connected with the in-phase input end of the second comparator U1-B by the 5th resistance R 5.Circuit also comprises the peripheral electronic circuit for the protection of the second comparator U1-B, peripheral electronic circuit comprises the 6th resistance R 6, the 8th resistance R 8 and by clamped the first diode D1 and the second diode D2 between 0-5V of SC signal, the inverting input of the second comparator U1-B is connected with the 8th resistance R 8 by the 6th resistance R 6, and the 6th resistance R 6 is connected the output of the second comparator U1-B with the common port of the 8th resistance R 8, the first diode D1 and the second diode D2 series connection, and the common port of the first diode D1 and the second diode D2 is connected with the output of the second comparator U1-B, the plus earth GND of the second diode D2.Circuit also comprises that one end of ten resistance R 10, the ten resistance R 10 in parallel with the 4th capacitor C 4 connects voltage-stabiliser tube Z3, the other end ground connection GND of the tenth resistance R 10.The negative pole of the 8th resistance R 8 and the first diode D1 is all connected 5V voltage, and the tenth resistance R 10 and voltage-stabiliser tube Z3 can effectively keep the voltage of triode Q4, can prevent punch-through.
Please further consult Fig. 3-4, the test result that Fig. 3 is traditional scheme, A channel is SC hardware lockout signal, B passage 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, can find out, the short circuit response time of this programme is quite short, only has 3.22us, when inverter output phase fault or short circuit relative to the earth, can effectively protect IGBT, has greatly improved the reliability of frequency converter.
Frequency converter current foldback circuit and method based on ACS710 provided by the invention, has following advantage:
1) utilize over-current detection chip ACS710 U2 to detect the output current of frequency converter; during output overcurrent, chip over current fault pin FAULT output voltage, SC signal low level triggers hardware lockout electronic circuit by PWM driven shield; realize short circuit priority protection, and chip overcurrent enables pin FAULT
--eN is also pulled down to low level until frequency converter output short-circuit is removed; Meanwhile, after output short-circuit releasing, frequency converter also can normally reset.
2) this invention has used the over-current signal of the over current fault pin of ACS710 Hall to design a kind of hardware current foldback circuit cleverly, make the output of frequency converter increase one-level short circuit priority protection circuit, this circuit protection signal is directly delivered to hardware lockout electronic circuit without CPU processing will drive pwm signal shielding, the time delay of this circuit only has the fault output time delay of ACS710 and the upset time delay of the second comparator, the comparator response time substantially all tens of between hundreds of nanoseconds, ACS710 fault output time delay is in 2-4us, therefore the time delay response time of whole circuit is in 5us, the short-circuit protection of thoroughly having got rid of traditional circuit shortcoming not in time, greatly improved the reliability of IGBT,
3) electric circuit inspection realizes 1ms delay time after overcurrent fault-signal, then to ACS710, send enable signal, greatly improve the stability of frequency converter work, and there is simple in structure, reasonable in design, the feature such as cost is low, working stability, reliability is high and speed is fast.
Disclosed is above only several specific embodiment of the present invention, but the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (8)
1. the frequency converter current foldback circuit based on ACS710, it is characterized in that, comprise connect frequency converter over-current detection chip, fault pull-up resistor, enable pull-up resistor, for the first comparator that the actuation voltage of chip over current fault pin and reference voltage level are compared, for overcurrent being carried out to the second comparator, the 11 resistance, the 4th electric capacity, triode, voltage-stabiliser tube and the hardware lockout electronic circuit of level upset protection; Described fault pull-up resistor is connected and will on it, draws with chip over current fault pin, described pull-up resistor and the chip overcurrent of enabling enables that pin is connected and will on it, draw, and described chip over current fault pin is connected with the in-phase input end of the first comparator, the inverting input of described the first comparator connects reference voltage source and its output is connected with the in-phase input end of the second comparator, and the output of described the second comparator connects SC signal; Described chip overcurrent enables the emitter of pin connecting triode, described the 11 resistance and the 4th Capacitance parallel connection, and the 4th electric capacity is attempted by between SC signal and ground, the grounded collector of described triode, and the common port of described the 11 resistance and the 4th electric capacity is connected with the base stage of triode by voltage-stabiliser tube, described SC signal is connected with hardware lockout electronic circuit.
2. the frequency converter current foldback circuit based on ACS710 according to claim 1, it is characterized in that, described circuit is also included as the first electric capacity that chip overcurrent enables pin filtering, the second electric capacity of delay time is set and the second resistance and the 4th resistance of flow point resistance was set for frequency converter for chip over current fault pin; One end of described the first electric capacity enables pin with the first resistance with chip overcurrent respectively and is connected, the other end ground connection of described the first electric capacity, one end of described the second electric capacity is connected with chip over current fault pin with the 3rd resistance respectively, the other end ground connection of described the second electric capacity, described the second resistance is connected with over-current detection chip with the 4th resistance series connection and its common port.
3. the frequency converter current foldback circuit based on ACS710 according to claim 1 and 2; it is characterized in that; described circuit also comprises the 7th resistance being connected between the first comparator inverting input and reference voltage source; described the 7th resistance is also by the 15 grounding through resistance, and the output of described the first comparator is connected with the in-phase input end of the second comparator by the 5th resistance.
4. the frequency converter current foldback circuit based on ACS710 according to claim 3, it is characterized in that, described circuit also comprises the peripheral electronic circuit for the protection of the second comparator, described peripheral electronic circuit comprises the 6th resistance, the 8th resistance and by clamped the first diode and the second diode between 0-5V of SC signal, the inverting input of described the second comparator is connected with the 8th resistance by the 6th resistance, and described the 6th resistance is connected the output of the second comparator with the common port of the 8th resistance, described the first diode and the series connection of the second diode, and the common port of the first diode and the second diode is connected with the output of the second comparator, the plus earth of described the second diode.
5. the frequency converter current foldback circuit based on ACS710 according to claim 4, is characterized in that, described circuit also comprises the tenth resistance with the 4th Capacitance parallel connection, and one end of described the tenth resistance connects voltage-stabiliser tube, the other end ground connection of described the tenth resistance.
6. the frequency converter over-current protection method based on ACS710, is characterized in that, comprises the following steps:
Steps A, utilize over-current detection chip ACS710 to detect the output current of frequency converter, during output overcurrent, chip over current fault pin output voltage;
Step B, over-current detection chip ACS710 internal current source start the voltage of drop-down chip over current fault pin, are pulled down to protection voltage setting value, comparator upset, and SC signal transfers low level to;
Step C, SC signal trigger hardware lockout electronic circuit by PWM driven shield;
Step e, frequency converter output short-circuit are removed, and chip over current fault pin starts charging and resets;
Step F, frequency converter work.
7. the frequency converter over-current protection method based on ACS710 according to claim 6; it is characterized in that; before described step e, also comprise a step D, described step D is: frequency converter output short-circuit is not removed, and chip overcurrent enables pin and is pulled down to the releasing of frequency converter output short-circuit.
8. the frequency converter over-current protection method based on ACS710 according to claim 6, is characterized 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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| CN201310369618.0A CN103545792B (en) | 2013-08-22 | 2013-08-22 | inverter over-current protection circuit and method based on ACS710 |
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| CN108574462A (en) * | 2018-01-31 | 2018-09-25 | 中兴通讯股份有限公司 | Protect circuit, circuit protection method |
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Cited By (8)
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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 |
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| CN112072616A (en) * | 2020-09-02 | 2020-12-11 | 珠海格力电器股份有限公司 | IPM over-current detection circuit and electric appliance |
| 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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| CN103545792B (en) | 2016-06-29 |
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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. |