CN103063979B - Load open-circuit detection circuit - Google Patents
Load open-circuit detection circuit Download PDFInfo
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- CN103063979B CN103063979B CN201310000894.XA CN201310000894A CN103063979B CN 103063979 B CN103063979 B CN 103063979B CN 201310000894 A CN201310000894 A CN 201310000894A CN 103063979 B CN103063979 B CN 103063979B
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Abstract
The invention discloses a load open-circuit detection circuit which comprises a voltage sampling circuit, a current-limiting circuit, a rectifying circuit, an up-drawing circuit and a single-chip machine control circuit. The voltage sampling circuit is in series connection with a load to be detected; an output end of the voltage sampling circuit is connected with an input end of the rectifying circuit through the current-limiting circuit; an output end of the rectifying circuit and an output end of the up-drawing circuit are connected with a signal input end of the single-chip machine control circuit. The single-chip machine control circuit judges open-circuit of the load to be detected according to high level signals received by the input end of the single-chip machine control circuit, wherein the high level signals appear in square signals and affect periodic laws. Through simple voltage sampling and the ordinary single-chip machine without analog signal/ digital signal (A/D) transfer functions, the load open-circuit detection circuit can achieve the circuit, and therefore the circuit is low in cost. The single-chip machine can identify and detect open-circuit through the high level signals which appear in the square signals and affect the periodic laws, and the detection process is more accurate than the prior art.
Description
Technical field
The present invention relates to the load open-circuit detection circuit under a kind of forceful electric power environment.
Background technology
Under existing forceful electric power environment, when detecting load open circuit, the chip microcontroller open circuit of current transformer, amplifier and band A/D translation function is usually utilized to detect.Current transformer carries out detection sampling to the electric current on load branch, export corresponding voltage signal, through amplifier amplify after input tape A/D translation function single-chip microcomputer in, carry out recognition detection by single-chip microcomputer after analog voltage signal after amplification is converted to digital signal, whether interpretation load opens a way.In above-mentioned testing circuit, the price of the single-chip microcomputer of current transformer and band A/D translation function all costly, causes whole circuit cost higher.The volume of current transformer is also comparatively large simultaneously, takes up room comparatively large, makes the volume of testing circuit larger.In addition, the single-chip microcomputer of band A/D translation function, carrying out conversion to simulating signal needs to expend a period of time, and identifies it is not very sensitive and accurate to the signal after conversion, causes the open circuit Detection results of whole testing circuit to be not fine.
Summary of the invention
Technical matters to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, and propose a kind of load open-circuit detection circuit, circuit cost is lower.
Technical matters of the present invention is solved by following technical scheme:
A kind of load open-circuit detection circuit, comprises voltage sample circuit, current-limiting circuit, rectification circuit, pull-up circuit and single chip machine controlling circuit; Described voltage sample circuit is connected with load in series to be detected, the output terminal of described voltage sample circuit connects the input end of described rectification circuit by described current-limiting circuit, the output terminal of described rectification circuit and the output terminal of described pull-up circuit, the signal input part of described single chip machine controlling circuit links together, and judges described load open circuit to be detected when there is the high level signal affecting periodic law in the square-wave signal that described single chip machine controlling circuit receives according to input end.
The beneficial effect that the present invention is compared with the prior art is:
Load open-circuit detection circuit of the present invention, carry out sampling by voltage sample circuit to load branch to be detected to detect, rectification circuit carries out rectification conversion to sampling voltage, single chip machine controlling circuit signal input part connects the output of pull-up circuit and the output of rectification circuit, single-chip microcomputer receives square-wave signal at ordinary times, when occurring in square-wave signal that the high level signal affecting periodic law can judge load open circuit.Whole circuit, by simple voltage sampling, and the common single-chip microcomputer not with A/D translation function all can realizing circuit, and therefore circuit cost is lower.Single-chip microcomputer is by going out open circuit by recognition detection to the high level affecting periodic law occurred in square-wave signal, and testing process comparatively prior art is also more accurate.In addition, voltage sampling is by simple circuit realiration, and such as sample resistance realizes, and need not pass through current transformer testing circuit electric current, thus the volume of circuit is also less.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the load open-circuit detection circuit of the specific embodiment of the invention one;
Fig. 2 is the oscillogram of sampling voltage and the oscillogram of single chip machine controlling circuit input end signal in the load open-circuit detection circuit course of work of the specific embodiment of the invention one;
Fig. 3 is a kind of connection diagram that the load open-circuit detection circuit of the specific embodiment of the invention two sets up diode;
Fig. 4 is the another kind of connection diagram that the load open-circuit detection circuit of the specific embodiment of the invention two sets up diode;
Fig. 5 is the electrical block diagram of the load open-circuit detection circuit of the specific embodiment of the invention three;
Fig. 6 is a kind of connection diagram that the load open-circuit detection circuit of the specific embodiment of the invention three sets up diode;
Fig. 7 is the another kind of connection diagram that the load open-circuit detection circuit of the specific embodiment of the invention three sets up diode.
Embodiment
Contrast accompanying drawing below in conjunction with embodiment the present invention is described in further details.
Embodiment one
As shown in Figure 1, be the electrical block diagram of load open-circuit detection circuit in this embodiment.Load open-circuit detection circuit comprises voltage sample circuit 100, current-limiting circuit 200, rectification circuit 300, pull-up circuit 400 and single chip machine controlling circuit 500.
Wherein, between the live wire L that load R to be detected is connected on alternating current input and zero line N.In testing circuit, voltage sample circuit 100 and load R to be detected are connected in series, the output terminal of voltage sample circuit 100 connects the input end of rectification circuit 300 by current-limiting circuit 200, the output terminal of rectification circuit 300 and the output terminal of pull-up circuit 400, the signal input part in of single chip machine controlling circuit 500 links together, and judges load open circuit to be detected when there is the high level signal affecting periodic law in the square-wave signal that single chip machine controlling circuit 500 receives according to input end.
In this embodiment, voltage sample circuit 100 comprises sample resistance R4, the first end of sample resistance R4 is connected with one end of load R to be detected, as the output terminal of voltage sample circuit 100, the second end ground connection of sample resistance R4, the other end of load R to be detected connects ac power output.It is the other end of load R to be detected connects AC power L line by switch S shown in figure.The size of the electric current that the resistance of sample resistance R4 and power flow through according to load R branch road to be detected is chosen.
Current-limiting circuit 200 comprises current-limiting resistance R3.The first end of sample resistance R4 is by connecting the input end of rectification circuit 300 after current-limiting circuit R3.
Rectification circuit 300 is triode TR1, and the base stage of triode TR1, as the input end of rectification circuit 300, connects one end of sample resistance R4, the grounded emitter of triode TR1, and the collector of triode TR1 is as the output terminal of rectification circuit 300.
Pull-up circuit 400 comprises the first resistance R1 and voltage source V 1.The first end of the first resistance R1 is the output terminal of pull-up circuit 100, and second end of the first resistance R1 connects the output terminal of voltage source V 1.
The collector of signal input part in connecting triode TR1 of single chip machine controlling circuit 500 and the first end of the first resistance R1.
During work, on load R branch road to be detected, Closing Switch S, then simple sinusoidal alternating current overload R, load normally works.In testing circuit, sample resistance R4 is converted into voltage to the current sampling on load R branch road, and the voltage waveform of voltage sample circuit 100 output terminal is as shown in the U1 in Fig. 2, and this voltage, after current-limiting resistance R3, inputs the base stage of triode TR1.When the voltage magnitude of sine wave is greater than forward voltage (being generally 0.7V) of triode TR1, then triode TR1 conducting, namely the signal input part in of single chip machine controlling circuit 500 connects with ground, is low level.As shown in moment t0 to moment t1 in first cycle T in Fig. 2, in this time period, the amplitude of the voltage U 1 that sample circuit 100 exports is greater than forward voltage, and the signal Uin that single chip machine controlling circuit 500 receives is low level signal.When the voltage magnitude of sine wave is less than the forward voltage of the TR1 of triode or voltage reversal time, triode TR1 not conducting, namely the signal input part in of single chip machine controlling circuit 500 is pulled up circuit 400 pull-up, and the signal Uin of reception is high level.As shown in moment t1 to moment t2 in first cycle T in Fig. 2, in this time period, the amplitude of the voltage U 1 that sample circuit 100 exports is less than forward voltage or is in oppositely, and the signal Uin that single chip machine controlling circuit 500 receives is high level.From above-mentioned analysis, when load normally works, the frequency that the signal input part waveform of single chip machine controlling circuit 500 inputs according to AC sine is (as being civil power, be then 50/60Hz), the square-wave signal of a same frequency can be produced, microprocessor detect changes to the rule of level signal, can think that load R is working properly.
When after a certain moment open circuit of load R, as shown in Figure 2, be moment t '.Then in the t3 moment, in the moment of last end cycle, single chip machine controlling circuit 500 is low level signal as entered next periodic transformation by normal cycle work.But, after moment t ', load open circuit, the voltage U 1 that sample circuit 100 exports is always 0, triode TR1 cannot conducting again, single chip machine controlling circuit 500 remains reception high level signal after time t 3, also there is the high level signal (current time affecting periodic law in the square-wave signal that namely single chip machine controlling circuit 500 input end receives, high level signal should have but been there is) for the low level signal in square wave, thus can judge that open circuit phenomenon appears in load R branch road to be detected, follow-uply carry out fault handling.
From the course of work of above-mentioned testing circuit, the testing circuit of this embodiment, by simple voltage sample circuit, and the common single-chip microcomputer not with A/D translation function can realize the detection to the load open circuit under forceful electric power environment, for the existing circuit detected by the chip microcontroller of current transformer and band A/D translation function, the testing circuit cost of this embodiment is lower, and the volume of circuit is also less.Single-chip microcomputer is by going out open circuit by recognition detection to the high level affecting periodic law occurred in square-wave signal, and testing process comparatively prior art is also comparatively accurate, can avoid surveying by mistake.
Preferably, the load open-circuit detection circuit of this embodiment also comprises filtering circuit 600, and filtering circuit 600 is connected between the output terminal of rectification circuit 300 and the signal input part of single chip machine controlling circuit 500.By setting up filtering circuit, thus the noise of filtering rectification circuit 300 output voltage signal, the signal that single chip machine controlling circuit 500 is received is more accurate.In this embodiment, filtering circuit 600 comprises the second resistance R2 and electric capacity C; The first end of the second resistance R2, as the input end of filtering circuit 600, connects the output terminal of rectification circuit 300, i.e. triode TR1 collector; As 600 output terminals of filtering circuit after second end of the second resistance R2 is connected with the first end of electric capacity C, connect the signal input part of single chip machine controlling circuit 500; The second end ground connection of electric capacity C.By the RC circuit realiration filtering that resistance and electric capacity form.
Embodiment two
This embodiment is with the difference of embodiment one: in this embodiment, load detecting circuit also comprises diode D, make only to flow through forward alternating current in triode TR1 by the connection of diode D, namely from the base stage of triode TR1 to emitter, thus avoid inverse current to flow through triode TR1 causing triode TR1 to be burned.
As shown in Figure 3, for load open-circuit detection circuit load open-circuit detection circuit in this embodiment sets up a kind of connection diagram of diode.Load open-circuit detection circuit comprises voltage sample circuit 100, current-limiting circuit 200, diode D, rectification circuit 300, pull-up circuit 400 and single chip machine controlling circuit 500.Wherein, voltage sample circuit 100, current-limiting circuit 200, rectification circuit 300, the connection of pull-up circuit 400 and single chip machine controlling circuit 500 with the course of work all with identical in embodiment one, in this not repeat specification.Unlike, set up diode D in circuit, the anode of diode D connects the output terminal of current-limiting circuit 200, the base stage of negative electrode connecting triode TR1.After setting up diode D shown in Fig. 3, when prime simple alternating current is input as negative half period, cannot return circuit be formed, in triode TR1, can not inverse current be flow through, thus triode TR1 can be avoided to be reversed puncture.
As shown in Figure 4, for load open-circuit detection circuit load open-circuit detection circuit in this embodiment sets up the another kind of connection diagram of diode.The plus earth of the diode D set up in circuit, the base stage of negative electrode connecting triode TR1.After setting up diode D shown in Fig. 4, when prime simple alternating current is input as negative half period, inverse current flows through from diode D, can not flow through inverse current in triode TR1, thus triode TR1 can be avoided to be reversed puncture.
Embodiment three
This embodiment is with the difference of embodiment one: in this embodiment, rectification circuit 300 is optical coupling isolator OP1.
As shown in Figure 5, be the electrical block diagram of load open-circuit detection circuit in this embodiment.Load open-circuit detection circuit comprises voltage sample circuit 100, current-limiting circuit 200, rectification circuit 300, pull-up circuit 400 and single chip machine controlling circuit 500.Wherein, voltage sample circuit 100, current-limiting circuit 200, rectification circuit 300, the connection of pull-up circuit 400 and single chip machine controlling circuit 500 all with identical in embodiment one, in this not repeat specification.Unlike, the composition of rectification circuit 300.Rectification circuit 300 is optical coupling isolator OP1, the electrode input end of optical coupling isolator OP1 is as the input end of rectification circuit 300, the output terminal of voltage sample circuit 100 is connected by current-limiting circuit 200, the cathode output end of optical coupling isolator OP1 as the output terminal of rectification circuit 300, the negative input of optical coupling isolator OP1 and cathode output end ground connection.
During work, on load R branch road to be detected, Closing Switch S, then simple sinusoidal alternating current overload R, load normally works.Similarly, in testing circuit, sample resistance R4 is converted into voltage to the current sampling on load R branch road, after current-limiting resistance R3, and the electrode input end of input optical coupling isolator OP1.When the voltage magnitude of sine wave is greater than forward voltage (being generally 1V or 2V) of optical coupling isolator OP1, then optical coupling isolator OP1 conducting, namely the signal input part in of single chip machine controlling circuit 500 connects with ground, is low level.When the voltage magnitude of sine wave is less than the forward voltage of optical coupling isolator OP1 or voltage reversal time, optical coupling isolator OP1 not conducting, namely the signal input part in of single chip machine controlling circuit 500 is pulled up circuit 400 pull-up, and the signal Uin of reception is high level.From above-mentioned analysis, when load normally works, the signal input part waveform of single chip machine controlling circuit 500 is the square-wave signal producing a same frequency according to the frequency of AC sine input equally, and microprocessor detect changes to the rule of level signal, can think that load R is working properly.
When after a certain moment open circuit of load R, the voltage that sample circuit 100 exports is 0, and optical coupling isolator OP1 not conducting, the signal input part of single chip machine controlling circuit 500 is pulled up as high level.As load is not normally opened a way, current time is corresponding single chip machine controlling circuit 500 input end is low level signal, then the high level signal affecting square-wave cycle rule has appearred in single chip machine controlling circuit 500 output terminal.As load is not normally opened a way, current time is corresponding single chip machine controlling circuit 500 input end is high level signal, then wait until that next cycle starts still can remain high level signal when single chip machine controlling circuit 500 input end should be low level signal, then there is the high level signal affecting square-wave cycle rule in single chip machine controlling circuit 500 output terminal.Therefore, no matter when there is open circuit, single chip machine controlling circuit 500 is all the high level signal (current times according to having there is affecting periodic law in the square-wave signal received, high level signal should have but been there is) for the low level signal in square wave, can judge that open circuit phenomenon has appearred in load R branch road to be detected, thus instruct and follow-uply carry out fault handling.
From the course of work of above-mentioned testing circuit, the testing circuit of this embodiment, although form rectification circuit 300 by optical coupling isolator OP1, but during testing circuit work, in the square-wave signal that still can receive according to single-chip microcomputer input end, occur that the high level signal affecting periodic law judges load open circuit.Identical with embodiment one, this embodiment is by simple voltage sample circuit, and the common single-chip microcomputer not with A/D translation function can realize the detection to the load open circuit under forceful electric power environment, same circuit cost is lower, the volume of circuit is also less, and testing process comparatively prior art is also comparatively accurate, can avoid surveying by mistake.
Preferably, the load open-circuit detection circuit of this embodiment also comprises filtering circuit 600, the composition of filtering circuit 600 and with the connection of rectification circuit 300 and single chip machine controlling circuit 500 all with embodiment one in identical, in this not repeat specification.
Embodiment four
This embodiment is with the difference of embodiment three: in this embodiment, load detecting circuit also comprises diode D, make only to flow through forward alternating current in optical coupling isolator OP1 by the connection of diode D, namely from the electrode input end of optical coupling isolator OP1 to negative input, thus avoid inverse current to flow through optical coupling isolator OP1 causing optical coupling isolator OP1 to be burned.
As shown in Figure 6, for load open-circuit detection circuit load open-circuit detection circuit in this embodiment sets up a kind of connection diagram of diode.Load open-circuit detection circuit comprises voltage sample circuit 100, current-limiting circuit 200, diode D, rectification circuit 300, pull-up circuit 400 and single chip machine controlling circuit 500.Wherein, voltage sample circuit 100, current-limiting circuit 200, rectification circuit 300, the connection of pull-up circuit 400 and single chip machine controlling circuit 500 with the course of work all with identical in embodiment three, in this not repeat specification.Unlike, set up diode D in circuit, the anode of diode D connects the output terminal of current-limiting circuit 200, and negative electrode connects the electrode input end of optical coupling isolator OP1.After setting up diode D shown in Fig. 6, when prime simple alternating current is input as negative half period, cannot return circuit be formed, in optical coupling isolator OP1, can not inverse current be flow through, thus optical coupling isolator OP1 can be avoided to be reversed puncture.
As shown in Figure 7, for load open-circuit detection circuit load open-circuit detection circuit in this embodiment sets up the another kind of connection diagram of diode.The plus earth of the diode D set up in circuit, negative electrode connects the electrode input end of optical coupling isolator OP1.After setting up diode D shown in Fig. 7, when prime simple alternating current is input as negative half period, inverse current flows through from diode D, can not flow through inverse current in optical coupling isolator OP1, thus optical coupling isolator OP1 can be avoided to be reversed puncture.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, make some substituting or obvious modification without departing from the inventive concept of the premise, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a load open-circuit detection circuit, it is characterized in that: comprise voltage sample circuit (100), current-limiting circuit (200), rectification circuit (300), pull-up circuit (400) and single chip machine controlling circuit (500), described voltage sample circuit (100) and load to be detected (R) are connected in series, the output terminal of described voltage sample circuit (100) connects the input end of described rectification circuit (300) by described current-limiting circuit (200), the output terminal of described rectification circuit (300) and the output terminal of described pull-up circuit (400), the signal input part of described single chip machine controlling circuit (500) links together, described load open circuit to be detected is judged when there is the high level signal affecting periodic law in the square-wave signal that described single chip machine controlling circuit (500) receives according to input end.
2. load open-circuit detection circuit according to claim 1, it is characterized in that: described rectification circuit (300) is triode (TR1), the base stage of described triode (TR1) is as the input end of described rectification circuit (300), the grounded emitter of described triode (TR1), the collector of described triode (TR1) is as the output terminal of described rectification circuit (300).
3. load open-circuit detection circuit according to claim 1, it is characterized in that: described rectification circuit (300) is optical coupling isolator (OP1), the electrode input end of described optical coupling isolator (OP1) is as the input end of described rectification circuit (300), the cathode output end of described optical coupling isolator (OP1) as the output terminal of described rectification circuit (300), the negative input of described optical coupling isolator (OP1) and cathode output end ground connection.
4. the load open-circuit detection circuit according to Claims 2 or 3, it is characterized in that: also comprise diode (D), the anode of described diode (D) connects the output terminal of described current-limiting circuit (200), and negative electrode connects the input end of described rectification circuit (300).
5. the load open-circuit detection circuit according to Claims 2 or 3, is characterized in that: also comprise diode (D), and the plus earth of described diode (D), negative electrode connects the input end of described rectification circuit (300).
6. load open-circuit detection circuit according to claim 1, it is characterized in that: described voltage sample circuit (100) comprises sample resistance (R4), the first end of described sample resistance (R4) is connected, as the output terminal of described voltage sample circuit (100) with one end of described load to be detected (R); Second end ground connection of described sample resistance (R4), the other end of described load to be detected (R) connects ac power output.
7. load open-circuit detection circuit according to claim 1, is characterized in that: described current-limiting circuit (200) comprises current-limiting resistance (R3).
8. load open-circuit detection circuit according to claim 1, is characterized in that: described pull-up circuit (400) comprises the first resistance (R1) and voltage source (V1); The first end of described first resistance (R1) is the output terminal of described pull-up circuit (100), and the second end of described first resistance (R1) connects the output terminal of described voltage source (V1).
9. load open-circuit detection circuit according to claim 1, it is characterized in that: also comprise filtering circuit (600), described filtering circuit (600) is connected between the output terminal of described rectification circuit (300) and the signal input part of described single chip machine controlling circuit (500).
10. load open-circuit detection circuit according to claim 9, is characterized in that: described filtering circuit (600) comprises the second resistance (R2) and electric capacity (C); The first end of described second resistance (R2), as the input end of described filtering circuit (600), connects the output terminal of described rectification circuit (300); As (600) output terminal of described filtering circuit after second end of described second resistance (R2) is connected with the first end of described electric capacity (C), connect the signal input part of described single chip machine controlling circuit (500); Second end ground connection of described electric capacity (C).
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| CN201310000894.XA CN103063979B (en) | 2013-01-04 | 2013-01-04 | Load open-circuit detection circuit |
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| CN201310000894.XA CN103063979B (en) | 2013-01-04 | 2013-01-04 | Load open-circuit detection circuit |
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| CN103063979A CN103063979A (en) | 2013-04-24 |
| CN103063979B true CN103063979B (en) | 2014-12-31 |
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| CN103645413B (en) * | 2013-12-26 | 2016-07-20 | 科博达技术有限公司 | Testing circuit and automobile-used inversion system thereof |
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| WO2016041123A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Open-circuit detection circuit for led emergency lamp power supply |
| JP2016139390A (en) * | 2015-01-23 | 2016-08-04 | エスアイアイ・セミコンダクタ株式会社 | Detection circuit |
| FR3044771B1 (en) * | 2015-12-03 | 2017-12-01 | Continental Automotive France | OPEN LOAD DETECTION METHOD |
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| CN109917278A (en) * | 2019-03-29 | 2019-06-21 | 宁波奥克斯电气股份有限公司 | A kind of forceful electric power logic detection system and method |
| CN110221644B (en) * | 2019-05-23 | 2021-02-26 | 上海艾为电子技术股份有限公司 | Chip and external RSET resistance open circuit monitoring circuit thereof |
| CN110988575B (en) * | 2019-12-30 | 2022-08-16 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
| CN111157875B (en) * | 2019-12-31 | 2021-11-02 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN112255937B (en) * | 2020-09-18 | 2024-03-19 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
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