CN102830263B - 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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- CN102830263B CN102830263B CN201210320189.3A CN201210320189A CN102830263B CN 102830263 B CN102830263 B CN 102830263B CN 201210320189 A CN201210320189 A CN 201210320189A CN 102830263 B CN102830263 B CN 102830263B
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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 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 direct current being become interchange, is now widely used.General inverter circuit comprises direct voltage source and is connected to output smoothing capacitor, to generate required output voltage by the on-off element of width modulation (PWM) control signal driving.But in order to ensure the serviceable life of inverter circuit, inverter circuit short circuit or overload must be prevented to inverter circuit internal components, the especially infringement that brings of switching device.At present, inverter circuit short circuit or overload protecting circuit is generally adopted to protect inverter circuit.Traditional short circuit or overload protection method are normally limited the output of pwm signal by wave limiting by hardware circuit, thus restriction output voltage and electric current, then utilize software detecting method to close pwm signal through several power frequency period.The method needs complicated circuit to carry out limiting short-circuit current, and software test also has certain complexity.And the method needs to play a protective role to the switching device of inverter circuit through several power frequency period, like this, the switching device of inverter circuit inside must bear the infringement of several power frequency period electric current when short circuit or overload.Classic method is large to the short circuit of inverter circuit or overload protecting circuit volume, and software test is complicated, with high costs, and effect is not satisfactory.
Summary of the invention
The object of the invention is to overcome shortcomings and deficiencies of the prior art, the inverter circuit over-current detection system that a kind of circuit is simple, easy to detect, protection is timely and cost is low is provided.
Another object of the present invention is to provide the detection method that above-mentioned inverter circuit over-current detection system realizes.
The object of the invention is to be achieved through the following technical solutions: a kind of inverter circuit over-current detection system comprises inverter circuit, for gathering the current signal of inverter circuit, convert current signal to voltage signal and export the testing circuit of microcontroller to and receive control signal that microcontroller exports and control the driving circuit of pwm signal according to control signal, described testing circuit comprises the voltage stabilizing diode ZD1 be connected with inverter circuit by resistance R1, the positive pole of voltage stabilizing diode ZD1 is connected with the base stage of triode Q5, simultaneously by the resistance R2 that is connected in parallel and electric capacity C1 ground connection, triode Q5 grounded emitter, collector is connected with direct supply by resistance R3, microcontroller is connected with the collector of triode Q5.
Particularly, described microcontroller is provided with the counter of the signal pulse number of times for recording input microcontroller.
Particularly, described microcontroller is also provided with the timer of counter O reset for timing.
Particularly, described inverter circuit is full bridge inverter.
Particularly, the described collector of NPN triode Q5 is connected with the external interrupt mouth of microcontroller.
Particularly, described inverter circuit over-current detecting method, comprises the following steps:
Step 1, pre-set inverter circuit over-current detection system electrification work time, the counting variable Count of described counter resets, the timing variable t of described timer resets, and counter is set to negative edge and triggers, the count upper-limit value N of counter and the timing T of timer.
Step 2, inverter circuit over-current detection system electrification work, and start timer sum counter, and counter waits for that negative edge triggers, and when timer is often accumulated to timing T, is reset by the counting variable Count of counter and timing variable t.
If the external interrupt mouth of step 3 microcontroller receives negative edge signal, the counting variable Count of counter adds one, judges whether counting variable Count is more than or equal to N, if Count is more than or equal to N, then performs step 4, otherwise performs step 3.
Step 4, microcontroller send termination signal to close inversion pwm signal to driving circuit.
Particularly, the timing T of described timer is 20ms.
Particularly, the count upper-limit value N of described counter is 4.
The principle of work of the present invention's a kind of inverter circuit over-current detection system and method thereof is: testing circuit gathers the current signal of inverter circuit, and current signal is converted to voltage signal output, the voltage signal that microcontroller receiving test circuit exports.If inverter circuit normally works, then microcontroller receives one and has 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 for recording spike pulse signal number in microcontroller, timer reaches timing at every turn, counter and timer then automatic clear.If microcontroller detects be more than or equal at the counting variable of timing inside counting device the count upper-limit value preset, then judge inverter circuit short circuit or overload, send termination signal to driving circuit, driving circuit receives termination signal, closes pwm signal.
The invention has the following advantages and beneficial effect compared to existing technology:
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 detect short circuit or the overload of inverter circuit in time, thus closes pwm signal, efficiently can protect inverter circuit in time.
Accompanying drawing explanation
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 in 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 embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, inverter circuit over-current detection system comprises inverter circuit, for gathering a current signal for inverter circuit, converting current signal to voltage signal and export the testing circuit of microcontroller to and receive control signal that microcontroller exports and control the driving circuit of pwm signal according to control signal.
As shown in Figure 2, described inverter circuit is 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.Metal-oxide-semiconductor Q1 is all connected with DC bus input end (BUS+) with the drain electrode of metal-oxide-semiconductor Q3, and metal-oxide-semiconductor Q1 source electrode is connected with the source electrode of metal-oxide-semiconductor Q3 by series inductance L1 by after the resistance R0 that is connected in parallel and electric capacity C2; 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 is all connected with DC bus output terminal (BUS-) with the source electrode of metal-oxide-semiconductor Q4, simultaneously by resistance R4 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.
Described testing circuit comprises resistance R1 and voltage stabilizing diode ZD1, wherein one end of resistance R1 is connected with the source electrode of the metal-oxide-semiconductor Q2 of inverter circuit and metal-oxide-semiconductor Q4, the other end is connected with the negative pole of voltage stabilizing diode ZD1, the positive pole of voltage stabilizing diode ZD1 is connected with the base stage of NPN triode Q5, simultaneously by the resistance R2 that is connected in parallel and electric capacity C1 ground connection, NPN triode Q5 grounded emitter, collector is connected with direct supply by resistance R3, and microcontroller is connected with the collector of triode Q5.
The voltage signal that testing circuit exports from NPN triode Q5 collector inputs to microcontroller by the external interrupt mouth of microcontroller.Described microcontroller is provided with timer and the counter for recording the signal pulse number of times inputting microcontroller.
According to Fig. 3, Fig. 4 process flow diagram, described inverter circuit over-current detecting method, comprises the following steps:
Step 1, pre-set inverter circuit over-current detection system electrification work time, the counting variable Count of described counter resets, the timing variable t of described timer resets, and counter is set to negative edge and triggers, the count upper-limit value 4 of counter and the timing 20ms of timer.
Step 2, inverter circuit over-current detection system electrification work, and start timer sum counter, and counter waits for that negative edge triggers, and when timer is often accumulated to timing 20ms, is reset by the counting variable Count of counter and timing variable t.
If the external interrupt mouth of step 3 microcontroller receives negative edge signal, the counting variable Count of counter adds one, judges whether counting variable Count is more than or equal to 4, if Count is more than or equal to 4, then performs step 4, otherwise performs step 3.
Step 4, microcontroller send termination signal to close inversion pwm signal to driving circuit.
The principle of work of the present invention's a kind of inverter circuit over-current detection system and method thereof is: testing circuit gathers the current signal of inverter circuit, and current signal is converted to voltage signal output, the voltage signal that microcontroller receiving test circuit exports.If inverter circuit normally works, then microcontroller receives one and has 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 for recording spike pulse signal number in microcontroller, timer reaches timing at every turn, counter and timer then automatic clear.If microcontroller detects be more than or equal at the counting variable of timing inside counting device the count upper-limit value preset, 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; short circuit or the overload of inverter circuit can be detected in time, thus close inversion pwm signal, efficiently can protect inverter circuit in time.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. the implementation method of an inverter circuit over-current detection system, wherein, inverter circuit over-current detection system comprises: inverter circuit, for gathering the current signal of inverter circuit, convert current signal to voltage signal and export the testing circuit of microcontroller to and receive control signal that microcontroller exports and control the driving circuit of pwm signal according to control signal, described testing circuit comprises the voltage stabilizing diode ZD1 be connected with inverter circuit by resistance R1, the positive pole of voltage stabilizing diode ZD1 is connected with the base stage of triode Q5, simultaneously by the resistance R2 that is connected in parallel and electric capacity C1 ground connection, NPN triode Q5 grounded emitter, collector is connected with direct supply by resistance R3, microcontroller is connected with the collector of NPN triode Q5,
Described microcontroller is provided with the counter of the signal pulse number of times for recording input microcontroller;
Described microcontroller is also provided with the timer of counter O reset for timing;
Described inverter circuit is full bridge inverter;
The described collector of NPN triode Q5 is connected with the external interrupt mouth of microcontroller, it is characterized in that:
Step 1, pre-set inverter circuit over-current detection system electrification work time, the counting variable Count of described counter resets, the timing variable t of described timer resets, and counter is set to negative edge and triggers, the count upper-limit value N of counter and the timing T of timer;
Step 2, inverter circuit over-current detection system electrification work, and start timer sum counter, and counter waits for that negative edge triggers, and when timer is often accumulated to timing T, is reset by the counting variable Count of counter and timing variable t;
If the external interrupt mouth of step 3 microcontroller receives negative edge signal, the counting variable Count of counter adds one, judges whether counting variable Count is more than or equal to N, if Count is more than or equal to N, then performs step 4, otherwise performs step 3;
Step 4, microcontroller send termination signal to close pwm signal to driving circuit.
2. the implementation method of inverter circuit over-current detection system according to claim 1, is characterized in that: the timing T of described timer is 20ms.
3. the implementation method of inverter circuit over-current detection system according to claim 2, is characterized in that: the count upper-limit value N of described counter is 4.
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN102830263B (en) | 2015-01-14 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117672B (en) * | 2013-02-07 | 2015-08-26 | 江苏方程电力科技有限公司 | A kind of inverter control circuit be applied in electric power system |
| 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 |
| 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 |
| CN103983891B (en) | 2014-05-30 | 2018-10-09 | 台达电子企业管理（上海）有限公司 | The short trouble detection device and method of inverter circuit |
| 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 protection method |
| CN111426887A (en) * | 2020-04-22 | 2020-07-17 | 四川大学 | Pulse width comparison method for pulse current |
| CN112952767A (en) * | 2021-02-02 | 2021-06-11 | 上海技涵电子科技有限公司 | Circuit and method for detecting DS voltage of MOS (metal oxide semiconductor) transistor to realize short-circuit protection |
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