CN101860185B - Frequency converter drive protecting circuit - Google Patents
Frequency converter drive protecting circuit Download PDFInfo
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- CN101860185B CN101860185B CN 201010209358 CN201010209358A CN101860185B CN 101860185 B CN101860185 B CN 101860185B CN 201010209358 CN201010209358 CN 201010209358 CN 201010209358 A CN201010209358 A CN 201010209358A CN 101860185 B CN101860185 B CN 101860185B
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Abstract
The invention relates to a frequency converter drive protecting circuit which comprises a sampling unit, a comparing unit and a protection outputting unit, wherein the input end of the sampling unit is connected to a direct current bus of a frequency converter and is used for converting a current value of the direct current bus into a voltage value for outputting; the input end of the comparing unit is connected to the output end of the sampling unit and used for outputting a switching-on signal when the voltage value of the input end is more than a first threshold; and the protection outputting unit is used for outputting a protection signal according to the switching-on signal output by the comparing unit. The invention realizes the monitoring on the current of the direct current bus of the frequency converter by the sampling and the comparison and has lower cost. In addition, the circuit also has perfect protection function.
Description
Technical field
The present invention relates to the transducer drive field, more particularly, relate to a kind of transducer drive general protective circuit.
Background technology
When frequency converter occurs when unusual, reduce to minimum even reduce to zero because of the loss that unusually causes in order to make frequency converter, existing frequency converter all takes much count of defencive function, improves the validity of defencive function when increasing defencive function.
The defencive function of frequency converter is mainly realized in the following manner at present:
(1) drives protection based on HCPL-316J: by the tube voltage drop of detection IGBT in conduction period, judge whether IGBT is in overcurrent, short-circuit condition, and implement soft shutoff and stoppage protection measure; Its inner integrated collector emitter voltage undersaturation testing circuit and malfunction feedback circuit are for the reliably working of drive circuit provides safeguard.
(2) bus resistance sampling-type short-circuit protection: carry out current sampling at the frequency converter bus sample resistance of directly contacting, there are certain relation in sampling current and motor three-phase current, determine the short circuit threshold values according to this relation.
(3) output current short-circuit protection: by through current Hall the three-phase output current being taken a sample; current signal is addition introducing voltage comparator behind absolute value circuit respectively; compare with reference level; if be higher than reference level; then compare output protection; this signal links to each other with the power drive protection interrupting input pin of microprocessor, and then when overcurrent, PWM output is set to high-impedance state automatically.
(4) soon molten overcurrent protection: at the fast molten protective tube of inversion module current supply circuit serial connection, realize the overcurrent protection to inversion module.
(5) Switching Power Supply protection: based on the UC3844 inverse-excitation type switch power-supply, have the advantages such as volume is little, lightweight, output voltage ripple is little, and good stability, when line voltage floated, power supply also can work, therefore, as the driving power of IGBT, reach satisfied effect; But this power supply control chip relatively lacks aspect protection, and therefore at present a lot of frequency converter producers also only only have power supply overcurrent protection and under-voltage protection in the driving power design.
Yet though above-mentioned protective circuit respectively has advantage, cost is low, reliability is high, speed is fast, the complete function requirement but all can not satisfy simultaneously.Drive protection such as HCPL-316J, although this driving defencive function is comprehensive, cost is high; The bus current short-circuit protection, although method is simple, the insufficiency face of the fast protection of speed, and the high speed photo coupling cost is not low yet; The output current short-circuit protection was although not only can do current sample, but also can do the short circuit current protection, straight-through defencive function; Fast molten overcurrent protection can be described as the simplest method of overcurrent protection, but this protection slow motion can not be realized quick protection, especially can not directly protect IGBT, MOSFET etc.; And the Switching Power Supply protection only has power supply control chip UC3844 itself intrinsic overcurrent protection and under-voltage protection, and other protect famine, more need not talk a frequency converter output short circuit protection and power protection and be incorporated into one.
Summary of the invention
The technical problem to be solved in the present invention is, for problems such as above-mentioned frequency converter protective price are expensive, function is comprehensive not, provides a kind of transducer drive general protective circuit.
The technical scheme that the present invention solves the problems of the technologies described above is, a kind of frequency converter drive protecting circuit is provided, and comprises sampling unit, comparing unit, under-voltage protection unit, protection output unit, wherein:
The input of described sampling unit is connected to the dc bus of frequency converter, is used for the current value of described dc bus is converted to magnitude of voltage output;
The input of described comparing unit is connected to the output of sampling unit, output switch Continuity signal when being used for magnitude of voltage at the input of this comparing unit greater than first threshold;
The input of described under-voltage protection unit is connected to the driving power of frequency converter, the input that output is connected to described comparing unit, this under-voltage protection unit be used for its input terminal voltage during less than Second Threshold by the voltage of its output output greater than first threshold;
Described protection output unit is used for the switch conduction signal output protection signal according to described comparing unit output.
In frequency converter drive protecting circuit of the present invention; also comprise the chip protected location; the input of described chip protected location is connected to a reference source pin of power supply chip, the input that output is connected to described comparing unit, and this chip protected location is used for when a reference source pin output low level of power supply chip by the voltage of its output output greater than first threshold.
In frequency converter drive protecting circuit of the present invention; also comprise the high voltage protective unit; the input of described high voltage protective unit is connected to the driving power of frequency converter, the energization pins that output is connected to described power supply chip, and this high voltage protective unit is used for making the voltage of its output be higher than the 4th threshold value at its input power supply during greater than the 3rd threshold value.
In frequency converter drive protecting circuit of the present invention; described protection output unit includes optical coupler; the light-emitting diode of described optical coupler is opened or is closed according to the switching signal of comparing unit output, and the output of described protection output unit is positioned at the phototriode side of optical coupler.
In frequency converter drive protecting circuit of the present invention; described protection output unit comprises the optical coupling acceleration circuit of the phototriode side that is positioned at optical coupler; described optical coupling acceleration circuit comprises the 5th resistance; the 6th resistance; the 7th resistance and the 5th triode; wherein the 5th resistance and the 6th resistance string receive optical coupler phototriode emitter and with reference between the ground; the 5th triode is parallel-connected to the two ends of the 6th resistance by its base stage and emitter; the collector electrode of described the 5th triode is connected to high level via the 7th resistance, and the output of described protection output unit is positioned at the collector electrode of the 5th triode.
In frequency converter drive protecting circuit of the present invention; described comparing unit includes the first voltage stabilizing didoe, the 4th triode that puncture voltage is first threshold, and the negative pole of described the first voltage stabilizing didoe is the base stage that the positive pole of the input port of comparing unit and this first voltage stabilizing didoe is connected to the 4th triode.
In frequency converter drive protecting circuit of the present invention; described under-voltage protection unit comprises that the first resistance, the 3rd resistance, the 3rd triode, puncture voltage are the second voltage-stabiliser tube of Second Threshold; the negative pole of wherein said the second voltage-stabiliser tube is connected to the driving power of frequency converter; described the first resistance and the 3rd resistance are connected in series between the input of transducer drive power supply and comparing unit, and positive pole, the emitter that the collector electrode of described the 3rd triode is received between the first resistance and the 3rd resistance, base stage is connected to the second voltage-stabiliser tube connects with reference to ground.
In frequency converter drive protecting circuit of the present invention; described chip protected location includes the first triode, the second resistance and the 4th resistance; wherein said the second resistance and the 4th resistance are connected in series between the input of transducer drive power supply and comparing unit; the collector electrode of described the first triode is connected between the second resistance and the 4th resistance, emitter connects with reference to ground, and a reference source pin of described power supply chip is connected to the base stage of the first triode.
In frequency converter drive protecting circuit of the present invention; described high voltage protective unit comprises that puncture voltage is that the 3rd voltage stabilizing didoe, the second triode, the puncture voltage of the 3rd threshold value is the 4th voltage stabilizing didoe of the 4th threshold value; driving power, the positive pole that the negative pole of described the 3rd voltage stabilizing didoe is connected to frequency converter is connected to the base stage of the second triode, and the negative pole of described the 4th voltage stabilizing didoe is connected to the collector electrode that the energization pins of power supply chip, positive pole are connected to the second triode.
Frequency converter drive protecting circuit of the present invention, by sampling with relatively realize the monitoring of frequency changer direct current bus electric current, cost is lower.In addition, circuit of the present invention also has perfect defencive function, and when the inverter bridge short circuit, inverter bridge is straight-through; the driving power overvoltage, driving power is under-voltage, and power supply chip lost efficacy; the power supply feedback loop lost efficacy when occuring, and can not cause the frequency converter operating accident, also can not cause the inefficacy of components and parts.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the logic diagram of the embodiment of frequency converter drive protecting circuit of the present invention;
Fig. 2 is the circuit diagram of the embodiment of frequency converter drive protecting circuit of the present invention.
Embodiment
As shown in Figure 1, be the logic diagram of the embodiment of frequency converter drive protecting circuit of the present invention.In the present embodiment; this circuit comprises sampling unit 11, comparing unit 12, protection output unit 13; wherein the input of sampling unit 11 is connected to the dc bus of frequency converter; the input of comparing unit 12 is connected to the output of sampling unit 11, and the input of protection output unit 13 is connected to the output of comparing unit 12.Foregoing circuit is when electric current is excessive in dc bus (short circuit for example occurring), by protection output unit 13 output protection signals.
Above-mentioned sampling unit 11 is converted to the input that magnitude of voltage outputs to comparing unit 12 with the current value of frequency changer direct current bus; if the magnitude of voltage that comparing unit 12 is judged input during greater than first threshold to protection output unit 13 output switch Continuity signals, thereby protection output unit 13 output protection signals.
In above-mentioned frequency converter drive protecting circuit, also can comprise under-voltage protection unit 15, be used for output protection signal when the brownout of transducer drive power supply.In the present embodiment; driving power, the output that the input of under-voltage protection unit 15 is connected to frequency converter is connected to the input of comparing unit 12; this under-voltage protection unit 15 its input terminal voltage during less than Second Threshold by the voltage of its output output greater than first threshold, thereby comparing unit 12 is to protection output unit 13 output switch Continuity signals.
Also can comprise chip protected location 16 in the foregoing circuit, be used for output protection signal when power supply chip lost efficacy.A reference source pin, the output that the input of this chip protected location 16 is connected to power supply chip is connected to the input of comparing unit 12; this chip protected location 16 passes through its output output greater than the voltage of first threshold when a reference source pin output low level of power supply chip, thereby comparing unit 12 is to protection output unit 13 output switch Continuity signals.
In addition, also can comprise high voltage protective unit 17 in the foregoing circuit, be used for output protection signal when the overtension of transducer drive power supply.The input of this high voltage protective unit 17 is connected to the driving power of frequency converter, the energization pins that output is connected to power supply chip; this high voltage protective unit is used for making the voltage of its output be higher than the 4th threshold value at its input power supply during greater than the 3rd threshold value, thereby makes a reference source pin output low level of power supply chip.Correspondingly, chip protected location 16 is higher than the voltage of first threshold to comparing unit 12 outputs, and comparing unit 12 is to protection output unit 13 output switch Continuity signals.
As shown in Figure 2, be the circuit diagram of the embodiment of frequency converter drive protecting circuit of the present invention.In the present embodiment; protection output unit 13 includes optical coupler PC1; the light-emitting diode of this optical coupler PC1 is opened or is closed according to the switching signal of comparing unit 12 outputs, and the output of protection output unit 13 is positioned at the phototriode side of optical coupler PC1.
In addition, protection output unit 13 also can comprise the optical coupling acceleration circuit of the phototriode side that is positioned at optical coupler PC1, thereby guarantees the Circuit responce rapidity.This optical coupling acceleration circuit comprises the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 5th triode TR5, wherein the 5th resistance R 5 and the 6th resistance R 6 be concatenated into optical coupler PC1 phototriode emitter and with reference between the ground, the 5th triode TR5 is parallel-connected to the two ends of the 6th resistance R 6 by its base stage and emitter, the collector electrode of the 5th triode TR5 is connected to high level via the 7th resistance R 7.The output of this protection output unit 13 is positioned at the collector electrode of the 5th triode TR5.
Comparing unit 12 includes the first voltage stabilizing didoe ZD1, the 4th triode TR4 that puncture voltage is first threshold (for example 2.4V), and wherein the negative pole of the first voltage stabilizing didoe ZD1 is the base stage that the positive pole of the input port of comparing unit and this first voltage stabilizing didoe ZD4 is connected to the 4th triode TR4.In this comparing unit 12, for protection the 4th triode TR4, also current-limiting resistance R13, R14 can be set.
After amplifying, sampling unit 11 direct dc bus sampled value forwards with frequency converter output to the first voltage stabilizing didoe ZD1 of sampling unit 12.When the negative battery voltage of the first voltage stabilizing didoe ZD1 greater than 3.1V, the first voltage-stabiliser tube ZD1 conducting, the 4th triode TR4 conducting, thereby cause optical coupler PC1 conducting; When the base voltage of the 5th triode TR5 is higher than 0.7V, protection delivery outlet output low level fault-signal.
Under-voltage protection unit 15 comprises that the first resistance R 1, the 3rd resistance R 3, the 3rd triode TR3, puncture voltage are the second voltage-stabiliser tube ZD2 of Second Threshold (for example 15V); wherein the negative pole of the second voltage-stabiliser tube ZD2 is connected to the driving power of frequency converter; the first resistance R 1 and the 3rd resistance R 3 are connected in series between the input of transducer drive power supply and comparing unit 12, and positive pole, the emitter that the collector electrode of the 3rd triode TR3 is received between the first resistance R 1 and the 3rd resistance R 3, base stage is connected to the second voltage-stabiliser tube ZD2 connects with reference to ground.When driving power voltage less than 15.7V, the 3rd triode TR3 is in off state, driving power voltage draws on resistance R 1, R3, makes the first voltage stabilizing didoe ZD1 conducting, thereby makes the 4th triode TR4 conducting, output fault-signal.
Chip protected location 16 includes the first triode TR1, the second resistance R 2 and the 4th resistance R 4; wherein the second resistance R 2 and the 4th resistance R 4 are connected in series between the input of transducer drive power supply and comparing unit 12; the collector electrode of the first triode TR3 is connected between the second resistance R 2 and the 4th resistance R 4, emitter connects with reference to ground, and a reference source pin of power supply chip is connected to the base stage of the first triode TR1.When power supply chip (for example UC3844) lost efficacy, the a reference source pin of power supply chip (8 pin) is output as 0V, the first triode TR1 is in off state, driving power voltage draws on resistance R 2, R4, make the first voltage stabilizing didoe ZD1 conducting, thereby make the 4th triode TR4 conducting, the output fault-signal.
High voltage protective unit 17 comprises that puncture voltage is that the 3rd voltage stabilizing didoe ZD3, the second triode TR2, the puncture voltage of the 3rd threshold value (for example 19V) is the 4th voltage stabilizing didoe ZD4 of the 4th threshold value (for example 8V); wherein the negative pole of the 3rd voltage stabilizing didoe ZD3 driving power, the positive pole that are connected to frequency converter is connected to the base stage of the second triode TR2, and the negative pole of the 4th voltage stabilizing didoe ZD4 is connected to the collector electrode that the energization pins of power supply chip, positive pole are connected to the second triode TR2.When driving power voltage greater than 19.7V; the second triode TR2 is in opening state; the supply power voltage pin of power supply chip (7 pin) is forced to move to 8.7V; enter the under-voltage protection state thereby cause power supply chip, a reference source pin of power supply chip is output as 0V, and the first triode TR1 is in off state; driving power voltage draws on resistance R 2, R4; make the first voltage stabilizing didoe ZD1 conducting, thereby make the 4th triode TR4 conducting, the output fault-signal.
In foregoing circuit, when power supply in running status, suddenly power supply feedback loop fault can cause that each road voltage of power supply rises steadily.If driving power voltage is greater than 19.7V; the second triode TR2 is in opening state; the supply power voltage of power supply chip is forced to move to 8.7V; thereby cause power supply chip and enter the under-voltage protection state; the a reference source pin of power supply chip is output as 0V, and the first triode TR1 is in off state, and driving power voltage draws on resistance R 2, R4; thereby make the first voltage stabilizing didoe ZD conducting make the 4th triode TR4 conducting, the output fault-signal.
Circuit among Fig. 2 under normal circumstances, less than 3.1V (2.4V+0.7V), the first voltage stabilizing didoe ZD1 is in cut-off state to the bus current sampled value after forward amplifies, the 4th triode TR4 is in cut-off state, the output of fault-free signal; Driving power voltage is greater than 15.7V, and the 3rd triode TR3 is in conducting state, stops to draw on resistance R 1, the R3 to make the first voltage stabilizing didoe ZD1 conducting, and the 4th triode TR4 is in cut-off state, the output of fault-free signal; Driving power voltage is less than 19.7V, and the second triode TR2 is in off state, does not make power supply chip enter the undervoltage turnoff state, the output of fault-free signal; The power supply chip normal operation, 8 pin a reference sources are output as 5V, and the first triode TR1 is in conducting state, stops to draw on resistance R 2, the R4 to make the first voltage stabilizing didoe ZD1 conducting, and the 4th triode TR4 is in cut-off state, the output of fault-free signal.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. a frequency converter drive protecting circuit is characterized in that, comprises sampling unit, comparing unit, under-voltage protection unit, protection output unit, wherein:
The input of described sampling unit is connected to the dc bus of frequency converter, is used for the current value of described dc bus is converted to magnitude of voltage output;
The input of described comparing unit is connected to the output of sampling unit, output switch Continuity signal when being used for magnitude of voltage at the input of this comparing unit greater than first threshold;
The input of described under-voltage protection unit is connected to the driving power of frequency converter, the input that output is connected to described comparing unit, this under-voltage protection unit be used for its input terminal voltage during less than Second Threshold by the voltage of its output output greater than first threshold;
Described protection output unit is used for the switch conduction signal output protection signal according to described comparing unit output.
2. frequency converter drive protecting circuit according to claim 1; it is characterized in that; also comprise the chip protected location; the input of described chip protected location is connected to a reference source pin of power supply chip, the input that output is connected to described comparing unit, and this chip protected location is used for when a reference source pin output low level of power supply chip by the voltage of its output output greater than first threshold.
3. frequency converter drive protecting circuit according to claim 2; it is characterized in that; also comprise the high voltage protective unit; the input of described high voltage protective unit is connected to the driving power of frequency converter, the energization pins that output is connected to described power supply chip, and this high voltage protective unit is used for making the voltage of its output be higher than the 4th threshold value at its input power supply during greater than the 3rd threshold value.
4. frequency converter drive protecting circuit according to claim 1; it is characterized in that; described protection output unit includes optical coupler; the light-emitting diode of described optical coupler is opened or is closed according to the switching signal of comparing unit output, and the output of described protection output unit is positioned at the phototriode side of optical coupler.
5. frequency converter drive protecting circuit according to claim 4; it is characterized in that; described protection output unit comprises the optical coupling acceleration circuit of the phototriode side that is positioned at optical coupler; described optical coupling acceleration circuit comprises the 5th resistance; the 6th resistance; the 7th resistance and the 5th triode; wherein the 5th resistance and the 6th resistance string receive optical coupler phototriode emitter and with reference between the ground; the 5th triode is parallel-connected to the two ends of the 6th resistance by its base stage and emitter; the collector electrode of described the 5th triode is connected to high level via the 7th resistance, and the output of described protection output unit is positioned at the collector electrode of the 5th triode.
6. each described frequency converter drive protecting circuit according to claim 1-5; it is characterized in that; described comparing unit includes the first voltage stabilizing didoe, the 4th triode that puncture voltage is first threshold, and the negative pole of described the first voltage stabilizing didoe is the base stage that the positive pole of the input port of comparing unit and this first voltage stabilizing didoe is connected to the 4th triode.
7. each described frequency converter drive protecting circuit according to claim 1-5; it is characterized in that; described under-voltage protection unit comprises the first resistance; the 3rd resistance; the 3rd triode; puncture voltage is the second voltage-stabiliser tube of Second Threshold; the negative pole of wherein said the second voltage-stabiliser tube is connected to the driving power of frequency converter; described the first resistance and the 3rd resistance are connected in series between the input of transducer drive power supply and comparing unit, and the collector electrode of described the 3rd triode is received between the first resistance and the 3rd resistance; base stage is connected to the positive pole of the second voltage-stabiliser tube; emitter connects with reference to ground.
8. according to claim 2 or 3 described frequency converter drive protecting circuits; it is characterized in that; described chip protected location includes the first triode, the second resistance and the 4th resistance; wherein said the second resistance and the 4th resistance are connected in series between the input of transducer drive power supply and comparing unit; the collector electrode of described the first triode is connected between the second resistance and the 4th resistance, emitter connects with reference to ground, and a reference source pin of described power supply chip is connected to the base stage of the first triode.
9. frequency converter drive protecting circuit according to claim 3; it is characterized in that; described high voltage protective unit comprises that puncture voltage is that the 3rd voltage stabilizing didoe, the second triode, the puncture voltage of the 3rd threshold value is the 4th voltage stabilizing didoe of the 4th threshold value; driving power, the positive pole that the negative pole of described the 3rd voltage stabilizing didoe is connected to frequency converter is connected to the base stage of the second triode, and the negative pole of described the 4th voltage stabilizing didoe is connected to the collector electrode that the energization pins of power supply chip, positive pole are connected to the second triode.
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| CN 201010209358 CN101860185B (en) | 2010-06-25 | 2010-06-25 | Frequency converter drive protecting circuit |
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| CN 201010209358 CN101860185B (en) | 2010-06-25 | 2010-06-25 | Frequency converter drive protecting circuit |
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| CN101860185A CN101860185A (en) | 2010-10-13 |
| CN101860185B true CN101860185B (en) | 2013-03-27 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102866658B (en) * | 2012-08-22 | 2014-11-19 | 三一重工股份有限公司 | Frequency-variable lifting device monitoring method and system, and mixing plant |
| CN105391441B (en) * | 2015-11-23 | 2018-09-11 | 南阳理工学院 | Low-speed optical coupler accelerating circuit |
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN110369160B (en) * | 2019-06-25 | 2021-07-30 | 深圳市四方电气技术有限公司 | Centrifuge driver protection circuit |
| CN113891524B (en) * | 2020-07-03 | 2023-07-21 | 酷矽半导体科技(上海)有限公司 | Driving circuit, driving chip, driving system and driving method supporting wide voltage input |
| CN115276168A (en) * | 2022-08-10 | 2022-11-01 | 沃太能源股份有限公司 | Interlocking device, energy storage system with interlocking device, control method and device of interlocking device |
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