CN103207339B - Inverter over-current judging method and device thereof - Google Patents
Inverter over-current judging method and device thereof Download PDFInfo
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Abstract
The invention discloses inverter over-current judging method, comprise the following steps: current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor; The current peak detected compares with the current threshold preset by microprocessor, if current peak is more than or equal to current threshold, then stops the output of normal SPWM signal, then exports with the SPWM signal of low amplitude value sine wave signal equivalence to inverter; The output voltage of output voltage detecting circuit inverter, and voltage detecting result is sent to microprocessor; The voltage effective value detected and the voltage threshold preset compare by microprocessor, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.The invention also discloses the device implementing the method.It is caused by impact load or caused by short circuit that the present invention can distinguish inverter excess current exactly.
Description
Technical field
The present invention relates to a kind of determination methods for inverter excess current and device thereof.
Background technology
Short-circuit protection is vital problem in inverter exploitation, is related to the security of operation of whole device.The difficult point of short-circuit protection technology is easily will to connect big current that impact load (connecing power supply adaptor or bulb etc. as dashed forward) causes and real short-circuit current gets mixed up, to such an extent as to does the judgement made mistake.This erroneous judgement probably can cause two kinds of consequences: one, and real short-circuit conditions is missed, and causes device to be damaged instantaneously; Its two, be short-circuit current by the erroneous judgement of impact load current, now device will be turned off by mistake.In addition, existing inverter short circuit protection circuit mainly relies on hardware implementing, causes implementation cost higher.
Summary of the invention
Technical matters to be solved by this invention is the determination methods and the device thereof that are provided for inverter excess current, and it can judge that distinguishing inverter excess current is caused by impact load or caused by short circuit exactly, and implementation cost is cheap.
According to a kind of inverter over-current judging method of the present invention, comprise the following steps:
Current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor;
The current peak that current detection circuit detects by microprocessor and the current threshold preset compare, if this current peak is more than or equal to this current threshold, then stop the output of normal SPWM signal, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt;
Voltage detecting circuit detects the output voltage of inverter, and voltage detecting result is sent to microprocessor;
The voltage effective value that voltage detecting circuit detects by microprocessor and the voltage threshold preset compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.
According to a kind of inverter over-current judging device of the present invention, comprise current detection circuit, voltage detecting circuit and microprocessor; Wherein:
Current detecting result for detecting the electric current of inverter, and is sent to microprocessor by current detection circuit;
Voltage detecting result for detecting the output voltage of inverter, and is sent to microprocessor by voltage detecting circuit;
The current peak that microprocessor is used for current detection circuit to detect compares with the current threshold preset, if this current detection value is more than or equal to this current threshold, then stop normal SPWM signal to export, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt; And, export described in the SPWM signal of low amplitude value sine wave signal equivalence after, the voltage effective value detected by voltage detecting circuit and the voltage threshold preset compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.
According to another inverter over-current judging method of the present invention, comprise the following steps:
Current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor;
The current peak that current detection circuit detects by microprocessor and the first current threshold preset compare, if this current peak is more than or equal to this first current threshold, then stop the output of normal SPWM signal, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt;
The current effective value that current detection circuit detects by microprocessor and the second current threshold preset compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.
According to another inverter over-current judging device of the present invention, comprise current detection circuit and microprocessor; Wherein:
Current detecting result for detecting the electric current of inverter, and is sent to microprocessor by current detection circuit;
The current peak that microprocessor is used for current detection circuit to detect compares with the first current threshold preset, if this current peak is more than or equal to this first current threshold, then stop normal SPWM signal to export, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt; And, export described in the SPWM signal of low amplitude value sine wave signal equivalence after, the current effective value detected by current detection circuit and the second current threshold preset compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.
After adopting technique scheme, can judge that distinguishing inverter excess current is caused by impact load or caused by short circuit exactly.In addition, judgement processing procedure of the present invention mainly relies on microprocessor and realizes, and the hardware quantity adopted compared with prior art greatly reduces, and thus implementation cost is lower.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of inverter over-current judging method according to a first embodiment of the present invention.
Fig. 2 is the theory diagram of inverter over-current judging device according to a first embodiment of the present invention.
Fig. 3 is the theory diagram of the microprocessor according to invention first embodiment.
Fig. 4 is the SPWM waveform that exports of microprocessor and sine wave signal with this SPWM waveform equivalence according to an embodiment of the invention.
Fig. 5 is the schematic flow sheet of inverter over-current judging method according to a second embodiment of the present invention.
Fig. 6 is the theory diagram of inverter over-current judging device according to a second embodiment of the present invention.
Fig. 7 is the theory diagram of the microprocessor according to invention second embodiment.
Embodiment
Below in conjunction with accompanying drawing the present invention made and further illustrating.
With reference to figure 1.Inverter over-current judging method according to a first embodiment of the present invention, comprises the following steps:
Step S11, current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor; Can detect the bus current of inverter, also can be output current;
Step S13, the current peak that current detection circuit detects by microprocessor and the current threshold preset compare, if this current peak is more than or equal to this current threshold, then stop the output of normal SPWM signal, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, institute's low amplitude value sine wave signal refers to that the amplitude of this sine wave signal should guarantee that inverter can not be burnt;
Step S13, voltage detecting circuit detects the output voltage of inverter, and voltage detecting result is sent to microprocessor;
Step S14, the voltage effective value that voltage detecting circuit detects by microprocessor and the voltage threshold preset compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.Because short-circuit resistance is infinitely small, then the inverter output voltage effective value detected should be 0 in theory, under actual conditions, as long as the voltage threshold that setting one is very little, can reach the object of short circuit identification.Impact load (such as connection bulb, adapter etc.), exports at inverter and connects in a flash, and internal resistance is close with 0, but the voltage of output terminal can be no longer 0 very soon, and the output end voltage effective value recorded can be more than or equal to the voltage threshold of setting.
In a preferred embodiment, above-mentioned inverter over-current judging method is further comprising the steps, if microprocessor judges inverter short circuit, then outwardly sends signal, to cut off the power supply of inverter, plays the effect of short-circuit protection; If microprocessor judges causes inverter excess current by impact load, then after exporting the SPWM signal with the equivalence of low amplitude value sine wave signal, first export soft start SPWM signal to the switching tube of inverter, and then export normal SPWM signal to the switching tube of inverter.SPWM signal that the is above-mentioned and equivalence of low amplitude value sine wave signal and soft start SPWM signal all shown in Figure 4, be less than the sine wave signal with the equivalence of normal SPWM signal with the amplitude of the sine wave signal of this soft start SPWM signal equivalence, be greater than the amplitude of low amplitude value sine wave signal.Microprocessor exports soft start SPWM signal at second period, can realize the soft start of load, thus prevent the infringement to load.The concept of the voltage effective value in above-mentioned steps S14 is not limited to the voltage effective value of the complete cycle of shown in Fig. 4, also can be the voltage effective value in other a period of time, such as, and the voltage effective value in half period or 3/4ths cycles.
Fig. 2 shows the circuit block diagram of an embodiment of the device for realizing above-mentioned inverter over-current judging method.Inverter over-current judging device comprises current detection circuit 11, voltage detecting circuit 12 and microprocessor 13.Wherein: current detecting result for detecting the electric current of inverter 100, and is sent to microprocessor 13 by current detection circuit 11.Voltage detecting result for detecting the output voltage of inverter 100, and is sent to microprocessor 13 by voltage detecting circuit 12.Microprocessor 13 compares with the current threshold preset for the current peak detected by current detection circuit 11, if this current detection value is more than or equal to this current threshold, then stop normal SPWM signal to export, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of inverter 100, the amplitude of low amplitude value sine wave signal should guarantee that inverter can not be burnt; And, after exporting the SPWM signal with the equivalence of low amplitude value sine wave signal, the voltage effective value detected by voltage detecting circuit 12 and the voltage threshold preset compare, if this voltage effective value is less than voltage threshold, then judge that inverter 100 is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter 100 excess current by impact load.Microprocessor 13 such as can adopt MCU.Inverter 100 in figure is for full-bridge inverter, and inverter over-current judging method of the present invention and device thereof are also applicable to half-bridge inverter.
As shown in Figure 3, microprocessor 13 comprises current threshold setup unit 131, voltage threshold setup unit 132, SPWM signal output unit 133, first judging unit 134 and the second judging unit 135.
Wherein: current threshold setup unit 131 is for presetting and storaging current threshold value.Voltage threshold setup unit 132 is for presetting and storage voltage threshold value.SPWM signal output unit 133 is for exporting SPWM signal to the switching tube of inverter 100.First judging unit 134 compares for the current threshold of the current peak that detected by current detection circuit 11 and setting, if this current detection value is more than or equal to this current threshold, then control SPWM signal output unit 133 stops the output of normal SPWM signal, then exports with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of inverter 100.Second judging unit 135 is for after SPWM signal output unit 133 output with the SPWM signal of low amplitude value sine wave signal equivalence, the voltage effective value detect voltage detecting circuit 12 and the voltage threshold of setting compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.If the second judging unit 135 judges inverter short circuit, then outwardly send signal, to cut off the power supply of inverter; If it is cause inverter excess current by impact load that the second judging unit 135 judges, then after SPWM signal output unit 133 output with the SPWM signal of low amplitude value sine wave signal equivalence, second judging unit 135 control SPWM signal output unit 133 first exports soft start SPWM signal to the switching tube of inverter, and then exports normal SPWM signal to the switching tube of inverter.
Microprocessor export one detect to the switching tube of inverter 100 with the SPWM signal of low amplitude value sine wave signal equivalence time, except utilizing voltage effective value and judge described by first embodiment of the invention, also can utilize current effective value to judge.With reference to figure 5.Inverter over-current judging method according to a second embodiment of the present invention, comprises the following steps:
Step S21, current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor; Can detect the bus current of inverter, also can be output current;
Step S22, the current peak that current detection circuit detects by microprocessor and the first current threshold preset compare, if this current peak is more than or equal to this first current threshold, then stop the output of normal SPWM signal, export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, described low amplitude value sine wave signal refers to that the amplitude of this sine wave signal should guarantee that inverter can not be burnt;
Step S23, the current effective value that current detection circuit detects by microprocessor and the second current threshold preset compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.
In a preferred embodiment, above-mentioned inverter over-current judging method is further comprising the steps: if microprocessor judges inverter short circuit, then outwardly send signal, to cut off the power supply of inverter, plays the effect of short-circuit protection; If microprocessor judges causes inverter excess current by impact load, then after exporting the SPWM signal with the equivalence of low amplitude value sine wave signal, first export soft start SPWM signal to the switching tube of described inverter, and then export normal SPWM signal to the switching tube of inverter.In a second embodiment, the SPWM waveform that microprocessor exports is identical with the first embodiment, as shown in Figure 4.
Fig. 6 shows the circuit block diagram of an embodiment of the device for realizing this inverter over-current judging method.Inverter over-current judging device comprises current detection circuit 21 and microprocessor 23; Wherein: current detecting result for detecting the electric current of inverter 100, and is sent to microprocessor 23 by current detection circuit 21.Microprocessor 23 compares with the first current threshold preset for the current peak detected by current detection circuit 21, if this current peak is more than or equal to this first current threshold, then stop normal SPWM signal to export, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of inverter 100, the amplitude of low amplitude value sine wave signal should guarantee that inverter can not be burnt; And, after exporting the SPWM signal with the equivalence of low amplitude value sine wave signal, the current effective value detected by current detection circuit 21 and the second current threshold preset compare, if this current effective value is less than the second current threshold, then judge that inverter 100 is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter 100 excess current by impact load.
As shown in Figure 7, microprocessor 23 comprises the first current threshold setup unit 231, second current threshold setup unit 232, SPWM signal output unit 233, first judging unit 234 and the second judging unit 235.
Wherein: the first current threshold setup unit 231 is for presetting and store the first current threshold.Second current threshold setup unit 232 is for presetting and store the second current threshold.SPWM signal output unit 233 is for exporting SPWM signal to the switching tube of inverter 100.First judging unit 234 compares for the first current threshold of the current peak that detected by current detection circuit 21 and setting, if this current peak is more than or equal to this first current threshold, then control SPWM signal output unit 233 stops the output of normal SPWM signal, then exports with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of inverter 100.Second judging unit 235 is for after SPWM signal output unit 233 output with the SPWM signal of low amplitude value sine wave signal equivalence, the current effective value detect current detection circuit 21 and the second current threshold of setting compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.If the second judging unit 235 judges inverter short circuit, then outwardly send signal, to cut off the power supply of inverter; If if the second judging unit 235 judges it is cause inverter excess current by impact load, then after the output of SPWM signal output unit with the SPWM signal of low amplitude value sine wave signal equivalence, second judging unit 235 control SPWM signal output unit first exports soft start SPWM signal to the switching tube of inverter, and then exports normal SPWM signal to the switching tube of inverter.
Claims (10)
1. inverter over-current judging method, is characterized in that, comprises the following steps:
Current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor;
The current peak that current detection circuit detects by microprocessor and the current threshold preset compare, if this current peak is more than or equal to this current threshold, then stop the output of normal SPWM signal, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt;
Voltage detecting circuit detects the output voltage of inverter, and voltage detecting result is sent to microprocessor;
The voltage effective value that voltage detecting circuit detects by microprocessor and the voltage threshold preset compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.
2. inverter over-current judging method as claimed in claim 1, it is characterized in that, further comprising the steps: if described microprocessor judges causes inverter excess current by impact load, then after exporting the SPWM signal with the equivalence of low amplitude value sine wave signal, first export soft start SPWM signal to the switching tube of inverter, and then export normal SPWM signal to the switching tube of described inverter.
3. inverter over-current judging device, is characterized in that, comprises current detection circuit, voltage detecting circuit and microprocessor; Wherein:
Current detecting result for detecting the electric current of inverter, and is sent to microprocessor by current detection circuit;
Voltage detecting result for detecting the output voltage of inverter, and is sent to microprocessor by voltage detecting circuit;
The current peak that microprocessor is used for current detection circuit to detect compares with the current threshold preset, if this current detection value is more than or equal to this current threshold, then stop normal SPWM signal to export, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt; And, export described in the SPWM signal of low amplitude value sine wave signal equivalence after, the voltage effective value detected by voltage detecting circuit and the voltage threshold preset compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.
4. inverter over-current judging device as claimed in claim 3, it is characterized in that, described microprocessor comprises:
Current threshold setup unit, for presetting and store described current threshold;
Voltage threshold setup unit, for presetting and store described voltage threshold;
SPWM signal output unit, for exporting SPWM signal to the switching tube of described inverter;
First judging unit, compare for current peak that current detection circuit is detected and described current threshold, if this current detection value is more than or equal to this current threshold, then control SPWM signal output unit stops the output of normal SPWM signal, then exports with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter;
Second judging unit; For after the output of SPWM signal output unit with the SPWM signal of low amplitude value sine wave signal equivalence, the voltage effective value detected by voltage detecting circuit and described voltage threshold compare, if this voltage effective value is less than voltage threshold, then judge that inverter is short-circuited, if this voltage effective value is more than or equal to voltage threshold, then judge it is cause inverter excess current by impact load.
5. inverter over-current judging device as claimed in claim 4, it is characterized in that, if if the second described judging unit judges it is cause inverter excess current by impact load, then after the output of SPWM signal output unit with the SPWM signal of low amplitude value sine wave signal equivalence, control SPWM signal output unit first exports soft start SPWM signal to the switching tube of inverter, and then exports normal SPWM signal to the switching tube of described inverter.
6. inverter over-current judging method, is characterized in that, comprises the following steps:
Current detection circuit detects the electric current of inverter, and current detecting result is sent to microprocessor;
The current peak that current detection circuit detects by microprocessor and the first current threshold preset compare, if this current peak is more than or equal to this first current threshold, then stop the output of normal SPWM signal, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt;
The current effective value that current detection circuit detects by microprocessor and the second current threshold preset compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.
7. inverter over-current judging method as claimed in claim 6, it is characterized in that, further comprising the steps: if described microprocessor judges causes inverter excess current by impact load, then after exporting the SPWM signal with the equivalence of low amplitude value sine wave signal, first export soft start SPWM signal to the switching tube of described inverter, and then export normal SPWM signal to the switching tube of described inverter.
8. inverter over-current judging device, is characterized in that, comprises current detection circuit and microprocessor; Wherein:
Current detecting result for detecting the electric current of inverter, and is sent to microprocessor by current detection circuit;
The current peak that microprocessor is used for current detection circuit to detect compares with the first current threshold preset, if this current peak is more than or equal to this first current threshold, then stop normal SPWM signal to export, then export with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter, the amplitude of described low amplitude value sine wave signal should guarantee that inverter can not be burnt; And, export described in the SPWM signal of low amplitude value sine wave signal equivalence after, the current effective value detected by current detection circuit and the second current threshold preset compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.
9. inverter over-current judging device as claimed in claim 8, it is characterized in that, described microprocessor comprises:
First current threshold setup unit, for presetting and store the first described current threshold;
Second current threshold setup unit, for presetting and store the second described current threshold;
SPWM signal output unit, for exporting SPWM signal to the switching tube of described inverter;
First judging unit, compare for current peak that current detection circuit is detected and the first described current threshold, if this current peak is more than or equal to this first current threshold, then control SPWM signal output unit stops the output of normal SPWM signal, then exports with the SPWM signal of low amplitude value sine wave signal equivalence to the switching tube of described inverter;
Second judging unit; For after the output of SPWM signal output unit with the SPWM signal of low amplitude value sine wave signal equivalence, the current effective value detected by current detection circuit and the second described current threshold compare, if this current effective value is less than the second current threshold, then judge that inverter is short-circuited, if this current effective value is more than or equal to the second current threshold, then judge it is cause inverter excess current by impact load.
10. inverter over-current judging device as claimed in claim 9, it is characterized in that, if if the second described judging unit judges it is cause inverter excess current by impact load, then after the output of SPWM signal output unit with the SPWM signal of low amplitude value sine wave signal equivalence, control SPWM signal output unit first exports soft start SPWM signal to the switching tube of inverter, and then exports normal SPWM signal to the switching tube of described inverter.
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| KR20150088542A (en) * | 2014-01-24 | 2015-08-03 | 엘에스산전 주식회사 | Apparatus and method for detecting over current in an inverter |
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| CN102969918A (en) * | 2012-11-06 | 2013-03-13 | 联合汽车电子有限公司 | Three-phase bridge-type inverter system and urgency lower short-circuit protective circuit |
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| CN103207339A (en) | 2013-07-17 |
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Address after: 201203 Shanghai City, Pudong New Area China Zuchongzhi Road (Shanghai) Free Trade Zone No. 2388 building 1-2 Co-patentee after: Zhejiang Keboda Industrial Co., Ltd. Patentee after: Koboda technology, Limited by Share Ltd Address before: 201203, 1758 Zhangjiang East Road, Zhangjiang hi tech park, Shanghai, Pudong New Area Co-patentee before: Zhejiang Keboda Industrial Co., Ltd. Patentee before: Keboda Technology Corp. |
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