CN102830263A - Over-current detection system of inverter circuit and method of over-current detection system - Google Patents
Over-current detection system of inverter circuit and method of over-current detection system Download PDFInfo
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- CN102830263A CN102830263A CN2012103201893A CN201210320189A CN102830263A CN 102830263 A CN102830263 A CN 102830263A CN 2012103201893 A CN2012103201893 A CN 2012103201893A CN 201210320189 A CN201210320189 A CN 201210320189A CN 102830263 A CN102830263 A CN 102830263A
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Abstract
The invention relates to an over-current detection system of an inverter circuit and a method of the over-current detection system. The method comprises the steps of: collecting a current signal of the inverter circuit by a detection circuit, converting the current signal into a voltage signal to output to a microcontroller; if the inverter circuit is in a short circuit or overloaded, receiving a series of spike pulse signals by the microcontroller, wherein a timer and a counter for recording the quality of the spike pulse signals are arranged inside the microcontroller; if the microcontroller detects that a counting variable of the counter within timing time is greater than or equal to an upper limit value of counting set in advance, judging that the inverter circuit is in the short circuit or overloaded, then transmitting a terminating signal to a drive circuit by the microcontroller, and closing a PWM (pulse-width modulation) signal. The detection circuit disclosed by the invention is simple; the hardware cost is low, and a software testing method is simple and convenient; meanwhile, the detection method provided by the invention is strong in instantaneity; the short circuit or overload state of the inverter circuit can be immediately detected, so as to close the PWM signal, and the inverter circuit can be efficiently and timely protected.
Description
Technical field
The present invention relates to the inverter circuit technical field, be specifically related to a kind of inverter circuit over-current detection system and method thereof.
Background technology
Inverter circuit is a kind of circuit structure equipment that exchanges the direct current change, is widely used at present.General inverter circuit comprises direct voltage source and is connected to the output smoothing capacitor through width modulation (PWM) control signal switch driven element, to generate needed output voltage.But, must prevent the infringement that inverter circuit short circuit or overload bring for inverter circuit internal components, especially switching device in order to ensure the serviceable life of inverter circuit.At present, generally adopt inverter circuit short circuit or overload protecting circuit that inverter circuit is protected.Traditional short circuit or overload protection method are normally by the output of hardware circuit through wave limiting restriction pwm signal, thereby restriction output voltage and electric current then utilize software detecting method to close pwm signal through several power frequency periods.The method needs complicated circuitry to come limiting short-circuit current, and software test also has certain complexity.And the method need be passed through several power frequency periods and could the switching device of inverter circuit be played a protective role, like this, and inverter circuit switch inside device must bear several power frequency period electric currents when short circuit or overload infringement.Classic method is big to the short circuit or the overload protecting circuit volume of inverter circuit, and software test is complicated, and is with high costs, and effect is not satisfactory.
Summary of the invention
The objective of the invention is to overcome the deficiency and the defective of prior art, provide that a kind of circuit is simple, easy to detect, protection in time and the low inverter circuit over-current detection system of cost.
Another object of the present invention provides the detection method that above-mentioned inverter circuit over-current detection system is realized.
The objective of the invention is to realize through following technical scheme: a kind of inverter circuit over-current detection system comprises inverter circuit, is used to gather the current signal of inverter circuit; Current signal is converted to voltage signal and exports the testing circuit of microcontroller to and receive the control signal of microcontroller output and according to the driving circuit of control signal control pwm signal; Said testing circuit comprises the voltage stabilizing diode ZD1 that is connected with inverter circuit through resistance R 1; The positive pole of voltage stabilizing diode ZD1 is connected with the base stage of triode Q5; Simultaneously through the resistance R that is connected in parallel 2 and capacitor C 1 ground connection; Triode Q5 grounded emitter, collector is connected with direct supply through resistance R 3, and microcontroller is connected with the collector of triode Q5.
Particularly, said microcontroller is provided with the counter that is used to write down the signal pulse number of times of importing microcontroller.
Particularly, said microcontroller also is provided with and is used for the timer of timing with counter O reset.
Particularly, said inverter circuit is a full bridge inverter.
Particularly, the collector of said NPN triode Q5 is connected with the external interrupt mouth of microcontroller.
Particularly, said inverter circuit method for detecting short circuit may further comprise the steps:
Step 1, when inverter circuit over-current detection system being set working on power in advance; The counting variable Count zero clearing of said counter; The timing variable t zero clearing of said timer, timer are set to negative edge and trigger the counting higher limit N of counter and the timing T of timer.
Step 2, inverter circuit over-current detection system work on power, and start the timer sum counter, and counter waits for that negative edge triggers, when timer whenever is accumulated to timing T, with the counting variable Count and the timing variable t zero clearing of counter.
Step 3, if the external interrupt mouth of microcontroller receives the negative edge signal, the counting variable Count of counter adds one, whether judges counting variable Count more than or equal to N, more than or equal to N, then execution in step 4 as if Count, otherwise execution in step 3.
Particularly, the timing T of said timer is 20ms.
Particularly, the counting higher limit N of said counter is 4.
The principle of work of the present invention a kind of inverter circuit over-current detection system and method thereof is: testing circuit is gathered the current signal of inverter circuit, and converts current signal to voltage signal output, the voltage signal of microcontroller receiving test circuit output.If the inverter circuit operate as normal, then one of microcontroller reception has the fixed value voltage signal; If inverter circuit short circuit or overload, microcontroller receives a series of spike pulse signal.Be provided with timer and the counter that is used to write down spike pulse signal number in the microcontroller, timer reaches timing at every turn, and counter and timer be automatic clear then.If microcontroller detects counting variable at timing inside counting device more than or equal to predefined counting higher limit, then judge inverter circuit short circuit or overload, send termination signal to driving circuit, driving circuit receives termination signal, closes pwm signal.
The invention compares that prior art has the following advantages and beneficial effect:
1, testing circuit of the present invention is simple, and hardware cost is low.
2, method for testing software of the present invention is convenient, simple.
3, detection method provided by the invention is real-time, can in time detect the short circuit or the overload of inverter circuit, thereby close pwm signal, can efficiently protect inverter circuit in time.
Description of drawings
Fig. 1 is the theory diagram of a kind of inverter circuit over-current detection of the present invention system;
Fig. 2 is the circuit theory diagrams of inverter circuit and testing circuit among the embodiment;
Fig. 3 is the external interrupt program flow diagram based on inverter circuit over-current detection system;
Fig. 4 is the timed sequence process flow diagram based on inverter circuit over-current detection system.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
Embodiment
As shown in Figure 1; A kind of inverter circuit over-current detection system comprises inverter circuit, is used to gather the current signal of inverter circuit, and current signal is converted to voltage signal and exports the testing circuit of microcontroller to and receive the control signal of microcontroller output and according to the driving circuit of control signal control pwm signal.
As shown in Figure 2, said inverter circuit is a full bridge inverter.Wherein metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 are N channel depletion type metal-oxide-semiconductor.The drain electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3 all is connected with dc bus input end (BUS+), and metal-oxide-semiconductor Q1 source electrode is connected with the source electrode of metal-oxide-semiconductor Q3 through series inductance L1 with capacitor C 2 backs through the resistance R 0 that is connected in parallel; The drain electrode of metal-oxide-semiconductor Q2 is connected with the source electrode of metal-oxide-semiconductor Q1, and the drain electrode of metal-oxide-semiconductor Q4 is connected with the source electrode of metal-oxide-semiconductor Q3; The source electrode of metal-oxide-semiconductor Q2 all is connected with dc bus output terminal (BUS-) with the source electrode of metal-oxide-semiconductor Q4, simultaneously through resistance R 4 ground connection; The grid of metal-oxide-semiconductor Q1 meets pulse-width signal PMW1; The grid of metal-oxide-semiconductor Q2 meets pulse-width signal PMW2; The grid of metal-oxide-semiconductor Q3 meets pulse-width signal PMW3; The grid of metal-oxide-semiconductor Q4 meets pulse-width signal PMW4, wherein pulse-width signal PMW1, pulse-width signal PMW4 and pulse-width signal PMW2, pulse-width signal PMW3 complementation.
Said testing circuit comprises resistance R 1 and voltage stabilizing diode ZD1; Wherein an end of resistance R 1 is connected with the metal-oxide-semiconductor Q2 of inverter circuit and the source electrode of metal-oxide-semiconductor Q4, and the other end is connected with the negative pole of voltage stabilizing diode ZD1, and the positive pole of voltage stabilizing diode ZD1 is connected with the base stage of NPN triode Q5; Simultaneously through the resistance R that is connected in parallel 2 and capacitor C 1 ground connection; NPN triode Q5 grounded emitter, collector is connected with direct supply through resistance R 3, and microcontroller is connected with the collector of triode Q5.
Testing circuit inputs to microcontroller from the voltage signal of the NPN triode Q5 collector output external interrupt mouth through microcontroller.Said microcontroller is provided with timer and the counter that is used to write down the signal pulse number of times of importing microcontroller.
Shown in Fig. 3, Fig. 4 process flow diagram, said inverter circuit over-current detecting method may further comprise the steps:
Step 1, when inverter circuit over-current detection system being set working on power in advance; The counting variable Count zero clearing of said counter; The timing variable t zero clearing of said timer, timer are set to negative edge and trigger the counting higher limit 4 of counter and the timing 20ms of timer.
Step 2, inverter circuit over-current detection system work on power, and start the timer sum counter, and counter waits for that negative edge triggers, when timer whenever is accumulated to timing 20ms, with the counting variable Count and the timing variable t zero clearing of counter.
Step 3, if the external interrupt mouth of microcontroller receives the negative edge signal, the counting variable Count of counter adds one, whether judges counting variable Count more than or equal to 4, more than or equal to 4, then execution in step 4 as if Count, otherwise execution in step 3.
The principle of work of the present invention a kind of inverter circuit over-current detection system and method thereof is: testing circuit is gathered the current signal of inverter circuit, and converts current signal to voltage signal output, the voltage signal of microcontroller receiving test circuit output.If the inverter circuit operate as normal, then one of microcontroller reception has the fixed value voltage signal; If inverter circuit short circuit or overload, microcontroller receives a series of spike pulse signal.Be provided with timer and the counter that is used to write down spike pulse signal number in the microcontroller, timer reaches timing at every turn, and counter and timer be automatic clear then.If microcontroller detects counting variable at timing inside counting device more than or equal to predefined counting higher limit, then judge inverter circuit short circuit or overload, send termination signal to driving circuit, driving circuit receives termination signal, closes pwm signal.
Testing circuit of the present invention is simple, and hardware cost is low, and method for testing software is convenient, simple; Detection method provided by the invention is real-time simultaneously; Can in time detect the short circuit or the overload of inverter circuit, thereby close the inversion pwm signal, can efficiently protect inverter circuit in time.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. inverter circuit over-current detection system; Comprise inverter circuit, be used to gather the current signal of inverter circuit; Current signal is converted to voltage signal and exports the testing circuit of microcontroller to and receive the control signal of microcontroller output and according to the driving circuit of control signal control pwm signal; It is characterized in that: said testing circuit comprises the voltage stabilizing diode ZD1 that is connected with inverter circuit through resistance R 1; The positive pole of voltage stabilizing diode ZD1 is connected with the base stage of triode Q5, simultaneously through the resistance R that is connected in parallel 2 and capacitor C 1 ground connection, NPN triode Q5 grounded emitter; Collector is connected with direct supply through resistance R 3, and microcontroller is connected with the collector of NPN triode Q5.
2. inverter circuit over-current detection according to claim 1 system is characterized in that: said microcontroller is provided with the counter of the signal pulse number of times that is used to write down the input microcontroller.
3. inverter circuit over-current detection according to claim 2 system is characterized in that: said microcontroller also is provided with the timer that is used for regularly counter O reset.
4. inverter circuit over-current detection according to claim 3 system, it is characterized in that: said inverter circuit is a full bridge inverter.
5. inverter circuit over-current detection according to claim 4 system, it is characterized in that: the collector of said NPN triode Q5 is connected with the external interrupt mouth of microcontroller.
6. implementation method based on the described inverter circuit short-circuit detecting of claim 5 system is characterized in that:
Step 1, when inverter circuit over-current detection system being set working on power in advance; The counting variable Count zero clearing of said counter; The timing variable t zero clearing of said timer, timer are set to negative edge and trigger the counting higher limit N of counter and the timing T of timer.
Step 2, inverter circuit over-current detection system work on power, and start the timer sum counter, and counter waits for that negative edge triggers, when timer whenever is accumulated to timing T, with the counting variable Count and the timing variable t zero clearing of counter.
Step 3, if the external interrupt mouth of microcontroller receives the negative edge signal, the counting variable Count of counter adds one, whether judges counting variable Count more than or equal to N, more than or equal to N, then execution in step 4 as if Count, otherwise execution in step 3.
Step 4, microcontroller send termination signal to close pwm signal to driving circuit.
7. according to the said inverter circuit method for detecting short circuit of claim 6, it is characterized in that: the timing T of said timer is 20ms.
8. according to the said inverter circuit method for detecting short circuit of claim 6, it is characterized in that: the counting higher limit N of said counter is 4.
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| CN201210320189.3A CN102830263B (en) | 2012-08-31 | 2012-08-31 | Over-current detection system of inverter circuit and method of over-current detection system |
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| CN201210320189.3A CN102830263B (en) | 2012-08-31 | 2012-08-31 | Over-current detection system of inverter circuit and method of over-current detection system |
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| CN102830263B CN102830263B (en) | 2015-01-14 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117672A (en) * | 2013-02-07 | 2013-05-22 | 江苏方程电力科技有限公司 | Inverter control circuit applied to electric power system |
| CN103457239A (en) * | 2013-08-30 | 2013-12-18 | 深圳市晶福源电子技术有限公司 | Protection method for short circuit of high frequency uninterrupted power supply |
| CN103532090A (en) * | 2013-10-30 | 2014-01-22 | 沈阳君威新能科技有限公司 | Multilevel, online and adjustable overcurrent protection module |
| CN105162080A (en) * | 2015-08-07 | 2015-12-16 | 珠海格力电器股份有限公司 | Inductive load low-voltage protection circuit and protection method |
| US9960592B2 (en) | 2014-05-30 | 2018-05-01 | Delta Electronics (Shanghai) Co., Ltd. | Short-circuit detection device and method used in inverter circuit |
| CN111426887A (en) * | 2020-04-22 | 2020-07-17 | 四川大学 | Pulse width comparison method for pulse current |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103117672A (en) * | 2013-02-07 | 2013-05-22 | 江苏方程电力科技有限公司 | Inverter control circuit applied to electric power system |
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| CN103457239A (en) * | 2013-08-30 | 2013-12-18 | 深圳市晶福源电子技术有限公司 | Protection method for short circuit of high frequency uninterrupted power supply |
| CN103457239B (en) * | 2013-08-30 | 2016-01-20 | 深圳晶福源科技股份有限公司 | The guard method of high frequency uninterrupted power supply short circuit |
| CN103532090A (en) * | 2013-10-30 | 2014-01-22 | 沈阳君威新能科技有限公司 | Multilevel, online and adjustable overcurrent protection module |
| CN103532090B (en) * | 2013-10-30 | 2016-02-17 | 沈阳君威新能科技有限公司 | Overcurrent protection module that multistage in-line is adjustable |
| US9960592B2 (en) | 2014-05-30 | 2018-05-01 | Delta Electronics (Shanghai) Co., Ltd. | Short-circuit detection device and method used in inverter circuit |
| CN105162080A (en) * | 2015-08-07 | 2015-12-16 | 珠海格力电器股份有限公司 | Inductive load low-voltage protection circuit and protection method |
| CN105162080B (en) * | 2015-08-07 | 2018-01-19 | 珠海格力电器股份有限公司 | Inductive load low voltage protection circuit and guard method |
| CN111426887A (en) * | 2020-04-22 | 2020-07-17 | 四川大学 | Pulse width comparison method for pulse current |
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| CN102830263B (en) | 2015-01-14 |
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