CN202471823U - Photo-coupling isolation line voltage zero-detection circuit - Google Patents
Photo-coupling isolation line voltage zero-detection circuit Download PDFInfo
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- CN202471823U CN202471823U CN2011205445342U CN201120544534U CN202471823U CN 202471823 U CN202471823 U CN 202471823U CN 2011205445342 U CN2011205445342 U CN 2011205445342U CN 201120544534 U CN201120544534 U CN 201120544534U CN 202471823 U CN202471823 U CN 202471823U
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Abstract
The utility model provides a photo-coupling isolation line voltage zero-detection circuit connecting with three phase output terminals of three phase power. The photo-coupling isolation line voltage zero-detection circuit includes a voltage dividing module dividing voltage of phase voltage of three phases and outputting divided voltage of the three phases; a comparator module connecting with an output terminal of the voltage dividing module and comparing the divided voltage of any two phases among the divided voltage of the three phases to output three channels of jumping signals; and a control output module connecting with an output terminal of the comparator module controller and controlling and outputting three channels of zero-detection voltage signal to three corresponding zero-detection terminals according to the three channels of the jumping signal output by the comparator module. The photo-coupling isolation line voltage zero-detection circuit provided by the utility model has a simple circuit structure and a low cost. Zero voltage and positive voltage can be output to the zero-detection terminals through the jumping signals, thereby detecting the line voltage zero passage effectively.
Description
Technical field
The utility model relates to and belongs to technical field of electricity, particularly relates to the line voltage zero-detection circuit that a kind of photoelectricity coupling is isolated.
Background technology
Along with the development of technology such as three phase rectifier technology and other power electronics, its control technology is also in continuous progress.In more control strategy, all need the line voltage zero-cross point of three-phase alternating-current supply be detected, form control signal, but all there is complicated circuit in present testing circuit, the circuit cost problem of higher.So designing a kind of line voltage zero-detection circuit practical, simple in structure, with low cost has been this area researchist's the task of top priority.
The utility model content
The shortcoming of prior art in view of the above, the purpose of the utility model are the line voltage zero-detection circuit that provides a kind of photoelectricity coupling to isolate to be used for solving the prior art complicated circuit, the circuit cost problem of higher.
For realizing above-mentioned purpose and other relevant purposes; The line voltage zero-detection circuit that the utility model provides a kind of photoelectricity coupling to isolate; Link to each other with the three-phase output end of three-phase electricity, comprising: the phase voltage of three-phase is carried out dividing potential drop respectively and exported the partial pressure unit of the branch pressure voltage of three-phase; Link to each other with the output terminal of said partial pressure unit, the branch pressure voltage of any two phases in the branch pressure voltage of the said three-phase of said partial pressure unit output is compared to export the comparing unit of three road jump signals; Link to each other with the output terminal of said comparing unit,, control and export the control output unit of three road zero-detection voltage signals to three corresponding zero-detection ends according to three road jump signals of comparing unit output.
Preferably, said zero-detection voltage signal comprises positive voltage signal and zero voltage signal.
Preferably, said partial pressure unit comprises: the first dividing potential drop electronic circuit, the second dividing potential drop electronic circuit and the 3rd dividing potential drop electronic circuit that link to each other with three-phase output end successively, be made up of resistance.
Preferably, be connected with first divider resistance between the first dividing potential drop electronic circuit output terminal and the second dividing potential drop electronic circuit output terminal; Be connected with second divider resistance between the second dividing potential drop electronic circuit output terminal and the 3rd dividing potential drop electronic circuit output terminal; Be connected with the 3rd divider resistance between the 3rd dividing potential drop electronic circuit output terminal and the first dividing potential drop electronic circuit output terminal.
Preferably, be connected with first filter capacitor between the first dividing potential drop electronic circuit output terminal and the second dividing potential drop electronic circuit output terminal; Be connected with second filter capacitor between the second dividing potential drop electronic circuit output terminal and the 3rd dividing potential drop electronic circuit output terminal; Be connected with the 3rd filter capacitor between the 3rd dividing potential drop electronic circuit output terminal and the first dividing potential drop electronic circuit output terminal.
Preferably; Said comparing unit comprises: first comparer that the branch pressure voltage of the branch pressure voltage of first dividing potential drop electronic circuit output and the output of the second dividing potential drop electronic circuit is compared, exports the first transition voltage; With the branch pressure voltage of second dividing potential drop electronic circuit output and branch pressure voltage second comparer that compare, the output second transition voltage of the 3rd dividing potential drop electronic circuit output, and the 3rd comparer that the branch pressure voltage of the branch pressure voltage of the 3rd dividing potential drop electronic circuit output and the output of the first dividing potential drop electronic circuit is compared, exports the 3rd transition voltage.
Preferably, said control output unit comprises: link to each other, be used to control first photoelectrical coupler of output zero voltage signal to the first zero-detection end with the output terminal of first comparer; Link to each other with first photoelectrical coupler, be used to control the first control electronic circuit of output positive potential signal to the first zero-detection end; Link to each other, be used to control second photoelectrical coupler of output zero voltage signal to the second zero-detection end with the output terminal of second comparer; Link to each other with second photoelectrical coupler, be used to control the second control electronic circuit of output positive potential signal to the second zero-detection end; Link to each other, be used to control the 3rd photoelectrical coupler of output zero voltage signal to the three zero-detection ends with the output terminal of the 3rd comparer; Link to each other with the 3rd photoelectrical coupler, be used to control the 3rd control electronic circuit of output positive potential signal to the three zero-detection ends.
Preferably, said first photoelectricity coupling comprises first light emitting diode and first phototriode; The anode of said first light emitting diode links to each other with first external power source, and negative electrode links to each other with the output terminal of said first comparer; The output voltage of said first external power source is less than or equal to the positive voltage of the first transition voltage of first comparer; Said second photoelectricity coupling comprises second light emitting diode and second phototriode; The anode of said second light emitting diode links to each other with second external power source, and negative electrode links to each other with the output terminal of said second comparer; The output voltage of said second external power source is less than or equal to the positive voltage of the second transition voltage of second comparer; Said the 3rd photoelectricity coupling comprises the 3rd light emitting diode and the 3rd phototriode; The anode of said the 3rd light emitting diode links to each other with the 3rd external power source, and negative electrode links to each other with the output terminal of said the 3rd comparer; The output voltage of said the 3rd external power source is less than or equal to the positive voltage of the 3rd transition voltage of the 3rd comparer.
Preferably, said control output unit also comprises: two ends are connected to the first filtering electronic circuit at first light emitting diode the two poles of the earth; Two ends are connected to the second filtering electronic circuit at second light emitting diode the two poles of the earth; Two ends are connected to the 3rd filtering electronic circuit at the 3rd light emitting diode the two poles of the earth.
Preferably; The said first control electronic circuit comprises first output resistance and first supplying resistance that links to each other with the output terminal of first photoelectrical coupler; The other end of said first supplying resistance connects first power supply, and the other end of said first output resistance is connected with the first zero-detection end; The said second control electronic circuit comprises second output resistance and second supplying resistance that links to each other with the output terminal of second photoelectrical coupler; The other end of said second supplying resistance connects second power supply, and the other end of said second output resistance is connected with the second zero-detection end; Said the 3rd control electronic circuit comprises the 3rd output resistance and the 3rd supplying resistance that links to each other with the output terminal of the 3rd photoelectrical coupler; The other end of said the 3rd supplying resistance connects the 3rd power supply, and the other end of said the 3rd output resistance is connected with the 3rd zero-detection end.
As stated, the line voltage zero-detection circuit that a kind of photoelectricity coupling of the utility model is isolated has following beneficial effect:
1, through being provided with the circuit of partial pressure unit, comparing unit and control output unit, can effectively detect line voltage zero-cross, be fit to the occasion of various needs detection line voltage over zero, have important value;
2, utilize resistance to carry out dividing potential drop, utilize the positive and negative not principle that can between the amplifier supply voltage, beat of the value of output simultaneously of forward and reverse input terminal voltage of amplifier, adopt the voltage of photoelectrical coupler control zero-detection end, circuit structure is simple;
3, the line voltage zero-detection circuit of the utility model also has highly versatile and advantage with low cost.
Description of drawings
Fig. 1 is shown as the line voltage zero-detection circuit synoptic diagram of a kind of photoelectricity coupling isolation of the utility model.
The element numbers explanation:
1 line voltage zero-detection circuit
11 partial pressure unit
12 comparing units
13 control output units.
Embodiment
Below by the embodiment of particular specific embodiment explanation the utility model, be familiar with other advantages and effect that this technological personage can be understood the utility model easily by the content that this instructions disclosed.
Notice; The appended graphic structure that illustrates of instructions of the line voltage zero-detection circuit that a kind of photoelectricity coupling of the utility model is isolated, ratio, size etc.; All only in order to cooperate the content that instructions disclosed, understanding and reading for being familiar with this technological personage, is not in order to limit the enforceable qualifications of the utility model; Event is the technical essential meaning of tool not; The adjustment of the modification of any structure, the change of proportionate relationship or size is not influencing under effect that the utility model can produce and the purpose that can reach, and the technology contents that all should still drop on the utility model and disclosed gets in the scope that can contain.Simultaneously; Quoted in this instructions as " on ", D score, " left side ", " right side ", " centre " reach the term of " " etc.; Also be merely be convenient to narrate clear, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment; Under no essence change technology contents, when also being regarded as the enforceable category of the utility model.
The line voltage zero-detection circuit that the utility model provides a kind of photoelectricity coupling to isolate; Be applied in and need the line voltage zero-cross point of three-phase alternating-current supply be detected; To form the circuit control system of control signal; In the present embodiment, set forth the principle and the embodiment of the line voltage zero-detection circuit that the photoelectricity coupling of the utility model isolates in detail, the line voltage zero-detection circuit that the photoelectricity coupling that makes those skilled in the art not need creative work can understand the utility model is isolated.
See also Fig. 1, it has shown the line voltage zero-detection circuit synoptic diagram that a kind of photoelectricity coupling of the utility model is isolated.Line voltage zero-detection circuit as shown in Figure 1, that the utility model provides a kind of photoelectricity coupling to isolate links to each other with the three-phase output end of three-phase electricity, and said line voltage zero-detection circuit 1 comprises: partial pressure unit 11, comparing unit 12 and control output unit 13.
Said partial pressure unit 11 is carried out dividing potential drop respectively with the phase voltage of three-phase, exports three road branch pressure voltages of three-phase simultaneously; Said partial pressure unit 11 comprises: the first dividing potential drop electronic circuit, the second dividing potential drop electronic circuit and the 3rd dividing potential drop electronic circuit that link to each other with three-phase output end successively, be made up of resistance; The said first dividing potential drop electronic circuit, the second dividing potential drop electronic circuit and the 3rd dividing potential drop electronic circuit become less voltage with the high voltage dividing potential drop of three-phase electricity respectively, so that control.
In the present embodiment, the said first dividing potential drop electronic circuit is made up of with R2 the resistance R 1 of series connection, and the input end of resistance R 1 links to each other with the A phase output terminal uA of three-phase electricity; The said second dividing potential drop electronic circuit is made up of with R4 the resistance R 3 of series connection, and the input end of resistance R 3 links to each other with the B phase output terminal uB of three-phase electricity; Said the 3rd dividing potential drop electronic circuit is made up of with R6 the resistance R 5 of series connection, and the input end of resistance R 5 links to each other with the C phase output terminal uC of three-phase electricity.
Be connected with first divider resistance between the said first dividing potential drop electronic circuit output terminal and the second dividing potential drop electronic circuit output terminal; Be connected with second divider resistance between said second dividing potential drop electronic circuit output terminal and the 3rd dividing potential drop electronic circuit output terminal; Be connected with the 3rd divider resistance between said the 3rd dividing potential drop electronic circuit output terminal and the first dividing potential drop electronic circuit output terminal; Said first divider resistance, second divider resistance and littler voltage of acquisition above the 3rd divider resistance.
In the present embodiment, be connected with the first divider resistance R7 between the output terminal of the output terminal of resistance R 2 and R4; Be connected with the second divider resistance R8 between the output terminal of resistance R 4 and the output terminal of R6; Be connected with the 3rd divider resistance R9 between the output terminal of resistance R 6 and the output terminal of R2.
Be connected with first filter capacitor between the said first dividing potential drop electronic circuit output terminal and the second dividing potential drop electronic circuit output terminal; Be connected with second filter capacitor between said second dividing potential drop electronic circuit output terminal and the 3rd dividing potential drop electronic circuit output terminal; Be connected with the 3rd filter capacitor between said the 3rd dividing potential drop electronic circuit output terminal and the first dividing potential drop electronic circuit output terminal; Said first filter capacitor, second filter capacitor and the 3rd filter capacitor carry out filtering to branch pressure voltage, thereby obtain more stable branch pressure voltage.
In the present embodiment, after connecting the first divider resistance R7 between the output terminal of the output terminal of resistance R 2 and R4, connect the first filter capacitor C1; Connect the second filter capacitor C2 after connecting the second divider resistance R8 between the output terminal of resistance R 4 and the output terminal of R6; Connect the 3rd filter capacitor C3 after connecting the 3rd divider resistance R9 between the output terminal of resistance R 6 and the output terminal of R2.
Said comparing unit 12 links to each other with the output terminal of said partial pressure unit 11, and the branch pressure voltage of any two phases in the branch pressure voltage of the said three-phase of said partial pressure unit 11 outputs is compared with the output jump signal.Said comparing unit 12 comprises: first comparer that the branch pressure voltage of the branch pressure voltage of first dividing potential drop electronic circuit output and the output of the second dividing potential drop electronic circuit is compared, exports the first transition voltage; With the branch pressure voltage of second dividing potential drop electronic circuit output and branch pressure voltage second comparer that compare, the output second transition voltage of the 3rd dividing potential drop electronic circuit output, and the 3rd comparer that the branch pressure voltage of the branch pressure voltage of the 3rd dividing potential drop electronic circuit output and the output of the first dividing potential drop electronic circuit is compared, exports the 3rd transition voltage.
In the present embodiment, each above-mentioned comparer adopts amplifier, so described first comparer, second comparer and the 3rd comparer should be the first amplifier A1, the second amplifier A2 and the 3rd amplifier A3 mutually; The negative input of the first amplifier A1 links to each other with the output terminal of resistance R 2; Electrode input end links to each other with the output terminal of resistance R 4, is used for the branch pressure voltage of first dividing potential drop electronic circuit output and the branch pressure voltage of second dividing potential drop electronic circuit output are compared and export the first transition voltage; The negative input of the second amplifier A2 links to each other with the output terminal of resistance R 4; Electrode input end links to each other with the output terminal of resistance R 6, is used for branch pressure voltage with the branch pressure voltage of second dividing potential drop electronic circuit output and the output of the 3rd dividing potential drop electronic circuit compares, the output second transition voltage; The negative input of the 3rd amplifier A3 links to each other with the output terminal of resistance R 6; Electrode input end links to each other with the output terminal of resistance R 2, is used for the branch pressure voltage of the 3rd dividing potential drop electronic circuit output and the branch pressure voltage of first dividing potential drop electronic circuit output are compared, export the 3rd transition voltage.
The output terminal of said first comparer, second comparer and the 3rd comparer is connected with the resistance that is used for current-limiting protection respectively; Said first comparer, second comparer and the 3rd comparer also have energization pins and grounding pin; The energization pins of said first comparer also is connected with filter capacitor, to obtain more stable voltage.
In the present embodiment, the output terminal of the first amplifier A1 is connected with resistance R 10, grounding pin ground connection, and the external 15V power vd 15 of energization pins, said energization pins also is connected with filter capacitor C4; The output terminal of the second amplifier A2 is connected with resistance R 11, grounding pin ground connection, energization pins external power supply VD15; The output terminal of the 3rd amplifier A3 is connected with resistance R 12, grounding pin ground connection, energization pins external power supply VD15.
Said control output unit 13 links to each other with the output terminal of said comparing unit 12, and according to the jump signal of said comparing unit 12 outputs, control and output zero-detection voltage signal are to the zero-detection end; Said zero-detection voltage signal comprises positive voltage signal and zero voltage signal; Said control output unit 13 comprises: link to each other, be used to control the first photoelectrical coupler OP1 of output zero voltage signal to the first zero-detection end with the output terminal of the first amplifier A1; Link to each other with the first photoelectrical coupler OP1, be used to control the first control electronic circuit of output positive potential signal to the first zero-detection end; Link to each other, be used to control the second photoelectrical coupler OP2 of output zero voltage signal to the second zero-detection end with the output terminal of the second amplifier A2; Link to each other with the second photoelectrical coupler OP2, be used to control the second control electronic circuit of output positive potential signal to the second zero-detection end; Link to each other, be used to control the 3rd photoelectrical coupler OP3 of output zero voltage signal to the three zero-detection ends with the output terminal of the 3rd amplifier A3; Link to each other with the 3rd photoelectrical coupler OP3, be used to control output positive potential signal to the three zero-detection ends to the 3rd control electronic circuit.
The first photoelectrical coupler OP1 comprises first light emitting diode and first phototriode; The anode of said first light emitting diode links to each other with the first external power source VD15, and negative electrode links to each other with the output terminal of said first comparer; The output voltage of the said first external power source VD15 is less than or equal to the positive voltage of the first transition voltage of first comparer; The second photoelectrical coupler OP2 comprises second light emitting diode and second phototriode; The anode of said second light emitting diode links to each other with the second external power source VD15, and negative electrode links to each other with the output terminal of said second comparer; The output voltage of the said second external power source VD15 is less than or equal to the positive voltage of the second transition voltage of second comparer; Said the 3rd photoelectricity coupling OP3 comprises the 3rd light emitting diode and the 3rd phototriode; The anode of said the 3rd light emitting diode links to each other with the 3rd external power source VD15, and negative electrode links to each other with the output terminal of said the 3rd comparer; The output voltage of said the 3rd external power source VD15 is less than or equal to the positive voltage of the 3rd transition voltage of the 3rd comparer.
Said control output unit also comprises: two ends are connected to the first filtering electronic circuit at first light emitting diode the two poles of the earth; Two ends are connected to the second filtering electronic circuit at second light emitting diode the two poles of the earth; Two ends are connected to the 3rd filtering electronic circuit at the 3rd light emitting diode the two poles of the earth.
The said first control electronic circuit comprises first output resistance and first supplying resistance that links to each other with the output terminal of first photoelectrical coupler; The other end of said first supplying resistance connects first power supply, and the other end of said first output resistance is connected with the first zero-detection end; The said second control electronic circuit comprises second output resistance and second supplying resistance that links to each other with the output terminal of second photoelectrical coupler; The other end of said second supplying resistance connects second power supply, and the other end of said second output resistance is connected with the second zero-detection end; Said the 3rd control electronic circuit comprises the 3rd output resistance and the 3rd supplying resistance that links to each other with the output terminal of the 3rd photoelectrical coupler; The other end of said the 3rd supplying resistance connects the 3rd power supply, and the other end of said the 3rd output resistance is connected with the 3rd zero-detection end.
In the present embodiment, said first filtering electronic circuit parallel resistor R13 and the capacitor C 5, the end of said resistance R 13 and common electric capacity C5 links to each other with the output terminal of resistance R 10, and the other end of resistance R 13 and common electric capacity C5 is connected the first external power source VD15; The said first photoelectrical coupler OP1 comprises luminescent device diode and sensitive device phototriode; The two ends of said diode link to each other with the two ends of common electric capacity C5 respectively; The collector of said phototriode links to each other with the input end of the first output resistance R19 and the first supplying resistance R16; The other end of the said first supplying resistance R16 connects external power source VD3.3; After being connected with the input end of capacitor C 8, the other end of the said first output resistance R19 connects the first zero-detection end Z
A
In the present embodiment, said second filtering electronic circuit parallel resistor R14 and common electric capacity C6, the end of said resistance R 14 and common electric capacity C6 links to each other with the output terminal of resistance R 11, and the other end of resistance R 14 and common electric capacity C6 is connected the second external power source VD15; The said second photoelectrical coupler OP2 comprises luminescent device diode and sensitive device phototriode; The two ends of said diode link to each other with the two ends of common electric capacity C6 respectively; The collector of said phototriode links to each other with the input end of the second output resistance R20 and the second supplying resistance R17; The other end of the said first supplying resistance R17 connects external power source VD3.3; After being connected with the input end of capacitor C 9, the other end of the said first output resistance R20 connects the first zero-detection end Z
B
In the present embodiment, said the 3rd filtering electronic circuit parallel resistor R15 and common electric capacity C7, the end of said resistance R 15 and common electric capacity C7 links to each other with the output terminal of resistance R 12, and the other end of resistance R 15 and common electric capacity C7 is connected the 3rd external power source VD 15; Said the 3rd photoelectrical coupler OP3 comprises luminescent device diode and sensitive device phototriode; The two ends of said diode link to each other with the two ends of common electric capacity C7 respectively; The collector of said phototriode links to each other with the input end of the first output resistance R21 and the first supplying resistance R18; The other end of the said first supplying resistance R18 connects external power source VD3.3; After being connected with the input end of capacitor C 10, the other end of the said first output resistance R21 connects the first zero-detection end Z
C
Describe the structure and the course of work of the utility model below in detail with specific embodiment.
Choose: said resistance R 1, R2, R3, R4, R5, R6 are plug-in unit resistance, and resistance is 200k Ω/0.25W; Said resistance R 7, R8, R9 are Chip-R, and resistance is 27k Ω/10W; Said resistance R 10, R11, R12 are Chip-R, and performance parameter is 1.5k Ω/10W; Said resistance R 13, R14, R15 are Chip-R, and performance parameter is 1.5k Ω/10W; Said resistance R 16, R17, R18 are Chip-R, and performance parameter is 330 Ω/10W; Said resistance R19, R20, R21 are Chip-R, and performance parameter is 1k Ω/10W; Said capacitor C 1, C2, C3 are filter capacitor, and size is 220nF; Said filter capacitor C4 size is 100nF; Said capacitor C 5, C6, C7, C8, C9, C10 are common electric capacity, and size is 1nF; The energization pins of said first amplifier, second amplifier and the 3rd amplifier is external 15V power supply respectively; Said R13, R14 and R15 be external 15V power supply respectively; Said R16, R17 and R18 be external 3.3V power supply respectively; The input three-phase alternating voltage is 220V, phase differential 120 degree, and all components and parts all adopt high precision.
1, the line voltage that forms mutually for AB two:
The A phase voltage forms A branch pressure voltage mutually through the resistance R 1 of series connection with resistance R 2; The B phase voltage forms B branch pressure voltage mutually through the resistance R 3 of series connection with resistance R 4; Obtain a little second divided voltage voltage on the resistance R 7, filter capacitor C1 carries out filtering to branch pressure voltage, afterwards; Said A phase branch pressure voltage gets into the negative input of the first amplifier A1, and said B phase branch pressure voltage gets into the electrode input end of the first amplifier A1; When AB line voltage becomes correct time by negative through zero crossing, the first amplifier A1 output terminal output voltage is become-15V by positive 15V, when AB line voltage becomes negative by decent zero crossing, the first amplifier A1 output terminal output voltage by-15V transition is positive 15V; When first amplifier A1 output just-during 15V voltage, because the R13 external power supply is positive 15V, so first photoelectrical coupler OP1 work, diode current flow is luminous, phototriode receives photoconduction to lead to work, with the voltage vanishing of resistance R 19, so the first zero-detection end Z
ABe no-voltage; When the first amplifier A1 output terminal output voltage is positive 15V, because the R13 external power supply also is positive 15V, so the first photoelectrical coupler OP1 does not work, the external power supply of resistance R 16 charges the first zero-detection end Z through resistance R 16 and resistance R 19 to capacitor C 8
ABe positive voltage.
AB line voltage is AB line voltage by positive zero crossing constantly by no-voltage to the moment of positive voltage conversion, otherwise AB line voltage is served as reasons negative zero crossing constantly by positive voltage to the moment of Zero voltage transition, thereby accomplishes AB line voltage zero-detection.
2, the line voltage that forms mutually for BC two:
The B phase voltage forms B branch pressure voltage mutually through the resistance R 3 of series connection with resistance R 4; The C phase voltage forms C branch pressure voltage mutually through the resistance R 5 of series connection with resistance R 6; Obtain a little second divided voltage voltage on the resistance R 8, filter capacitor C2 carries out filtering to branch pressure voltage, afterwards; Said B phase branch pressure voltage gets into the negative input of the second amplifier A2, and said C phase branch pressure voltage gets into the electrode input end of the first amplifier A2; When BC line voltage becomes correct time by negative through zero crossing, the second amplifier A2 output terminal output voltage is become-15V by positive 15V; When BC line voltage became negative by decent zero crossing, the second amplifier A2 output terminal output voltage became positive 15V by-15V; When second amplifier A2 output just-during 15V voltage, because the R14 external power supply is positive 15V, so second photoelectrical coupler OP2 work, diode current flow is luminous, phototriode receives photoconduction to lead to work, with the voltage vanishing of resistance R 20, so the second zero-detection end Z
BBe no-voltage; When the second amplifier A2 output terminal output voltage is positive 15V, because the R14 external power supply also is positive 15V, so the second photoelectrical coupler OP2 does not work, the external power supply of resistance R 17 charges the second zero-detection end Z through resistance R 17 and resistance R 20 to capacitor C 9
BBe positive voltage.
BC line voltage is BC line voltage by positive zero crossing constantly by no-voltage to the moment of positive voltage conversion, otherwise BC line voltage is served as reasons negative zero crossing constantly by positive voltage to the moment of Zero voltage transition, thereby accomplishes BC line voltage zero-detection.
3, the line voltage that forms mutually for CA two:
The A phase voltage forms A branch pressure voltage mutually through the resistance R 1 of series connection with resistance R 2; The C phase voltage forms C branch pressure voltage mutually through the resistance R 5 of series connection with resistance R 6; Obtain a little second divided voltage voltage on the resistance R 9, filter capacitor C3 carries out filtering to branch pressure voltage, afterwards; Said C phase branch pressure voltage gets into the negative input of the 3rd amplifier A3, and said A phase branch pressure voltage gets into the electrode input end of the 3rd amplifier A3; When CA line voltage becomes correct time by negative through zero crossing, the 3rd amplifier A3 output terminal output voltage is become-15V by positive 15V, and when CA line voltage became negative by decent zero crossing, the 3rd amplifier A3 output terminal output voltage became positive 15V by-15V; When the 3rd amplifier A3 output just-during 15V voltage, because the R15 external power supply is positive 15V, so the 3rd photoelectrical coupler OP3 work, diode current flow is luminous, phototriode receives photoconduction to lead to work, with the voltage vanishing of resistance R 21, so the 3rd zero-detection end Z
CBe no-voltage; When the 3rd amplifier A3 output terminal output voltage is positive 15V, because the R15 external power supply also is positive 15V, so the 3rd photoelectrical coupler OP3 does not work, the external power supply of resistance R 18 charges the 3rd zero-detection end Z through resistance R 18 and resistance R 21 to capacitor C 10
CBe positive voltage.
CA line voltage is CA line voltage by positive zero crossing constantly by no-voltage to the moment of positive voltage conversion, otherwise CA line voltage is served as reasons negative zero crossing constantly by positive voltage to the moment of Zero voltage transition, thereby accomplishes CA line voltage zero-detection.
In sum, the line voltage zero-detection circuit that a kind of photoelectricity coupling that the utility model provides is isolated has following advantage:
At first,, can effectively detect line voltage zero-cross, be fit to the occasion that various needs detect the phase voltage zero crossing, have important value through being provided with the circuit of partial pressure unit, comparing unit and control output unit;
Secondly, utilize resistance to carry out dividing potential drop, utilize the positive and negative not principle that can between the amplifier supply voltage, beat of the value of output simultaneously of forward and reverse input terminal voltage of amplifier, adopt the voltage of photoelectrical coupler control zero-detection end, circuit structure is simple;
Once more, the line voltage zero-detection circuit of the utility model also has highly versatile and advantage with low cost.
So the utility model has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
The foregoing description is the principle and the effect thereof of illustrative the utility model only, but not is used to limit the utility model.Any be familiar with this technological personage all can be under the spirit and category of the utility model, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable under such as in the technical field, must contain by the claim of the utility model not breaking away from all equivalence modification or changes that spirit that the utility model discloses and technological thought are accomplished down.
Claims (10)
1. the line voltage zero-detection circuit that the photoelectricity coupling is isolated links to each other with the three-phase output end of three-phase electricity, it is characterized in that, comprising:
The phase voltage of three-phase is carried out dividing potential drop respectively and exported the partial pressure unit of the branch pressure voltage of three-phase;
Link to each other with the output terminal of said partial pressure unit, the branch pressure voltage of any two phases in the branch pressure voltage of the said three-phase of said partial pressure unit output is compared to export the comparing unit of three road jump signals;
Link to each other with the output terminal of said comparing unit,, control and export the control output unit of three road zero-detection voltage signals to three corresponding zero-detection ends according to three road jump signals of comparing unit output.
2. the line voltage zero-detection circuit that photoelectricity coupling according to claim 1 is isolated, it is characterized in that: said zero-detection voltage signal comprises positive voltage signal and zero voltage signal.
3. the line voltage zero-detection circuit that photoelectricity according to claim 2 coupling is isolated, it is characterized in that: said partial pressure unit comprises: the first dividing potential drop electronic circuit, the second dividing potential drop electronic circuit and the 3rd dividing potential drop electronic circuit that link to each other with three-phase output end successively, be made up of resistance.
4. the line voltage zero-detection circuit that photoelectricity coupling according to claim 3 is isolated is characterized in that: be connected with first divider resistance between the first dividing potential drop electronic circuit output terminal and the second dividing potential drop electronic circuit output terminal; Be connected with second divider resistance between the second dividing potential drop electronic circuit output terminal and the 3rd dividing potential drop electronic circuit output terminal; Be connected with the 3rd divider resistance between the 3rd dividing potential drop electronic circuit output terminal and the first dividing potential drop electronic circuit output terminal.
5. the line voltage zero-detection circuit that photoelectricity coupling according to claim 4 is isolated is characterized in that: be connected with first filter capacitor between the first dividing potential drop electronic circuit output terminal and the second dividing potential drop electronic circuit output terminal; Be connected with second filter capacitor between the second dividing potential drop electronic circuit output terminal and the 3rd dividing potential drop electronic circuit output terminal; Be connected with the 3rd filter capacitor between the 3rd dividing potential drop electronic circuit output terminal and the first dividing potential drop electronic circuit output terminal.
6. the line voltage zero-detection circuit that photoelectricity coupling according to claim 3 is isolated; It is characterized in that: said comparing unit comprises: first comparer that the branch pressure voltage of the branch pressure voltage of first dividing potential drop electronic circuit output and the output of the second dividing potential drop electronic circuit is compared, exports the first transition voltage; With the branch pressure voltage of second dividing potential drop electronic circuit output and branch pressure voltage second comparer that compare, the output second transition voltage of the 3rd dividing potential drop electronic circuit output, and the 3rd comparer that the branch pressure voltage of the branch pressure voltage of the 3rd dividing potential drop electronic circuit output and the output of the first dividing potential drop electronic circuit is compared, exports the 3rd transition voltage.
7. the line voltage zero-detection circuit that photoelectricity coupling according to claim 6 is isolated, it is characterized in that: said control output unit comprises: link to each other, be used to control first photoelectrical coupler of output zero voltage signal to the first zero-detection end with the output terminal of first comparer; Link to each other with first photoelectrical coupler, be used to control the first control electronic circuit of output positive potential signal to the first zero-detection end; Link to each other, be used to control second photoelectrical coupler of output zero voltage signal to the second zero-detection end with the output terminal of second comparer; Link to each other with second photoelectrical coupler, be used to control the second control electronic circuit of output positive potential signal to the second zero-detection end; Link to each other, be used to control the 3rd photoelectrical coupler of output zero voltage signal to the three zero-detection ends with the output terminal of the 3rd comparer; Link to each other with the 3rd photoelectrical coupler, be used to control the 3rd control electronic circuit of output positive potential signal to the three zero-detection ends.
8. the line voltage zero-detection circuit that photoelectricity coupling according to claim 7 is isolated is characterized in that: said first photoelectricity coupling comprises first light emitting diode and first phototriode; The anode of said first light emitting diode links to each other with first external power source, and negative electrode links to each other with the output terminal of said first comparer; The output voltage of said first external power source is less than or equal to the positive voltage of the first transition voltage of first comparer; Said second photoelectricity coupling comprises second light emitting diode and second phototriode; The anode of said second light emitting diode links to each other with second external power source, and negative electrode links to each other with the output terminal of said second comparer; The output voltage of said second external power source is less than or equal to the positive voltage of the second transition voltage of second comparer; Said the 3rd photoelectricity coupling comprises the 3rd light emitting diode and the 3rd phototriode; The anode of said the 3rd light emitting diode links to each other with the 3rd external power source, and negative electrode links to each other with the output terminal of said the 3rd comparer; The output voltage of said the 3rd external power source is less than or equal to the positive voltage of the 3rd transition voltage of the 3rd comparer.
9. the line voltage zero-detection circuit that photoelectricity coupling according to claim 8 is isolated, it is characterized in that: said control output unit also comprises: two ends are connected to the first filtering electronic circuit at first light emitting diode the two poles of the earth; Two ends are connected to the second filtering electronic circuit at second light emitting diode the two poles of the earth; Two ends are connected to the 3rd filtering electronic circuit at the 3rd light emitting diode the two poles of the earth.
10. the line voltage zero-detection circuit that photoelectricity coupling according to claim 7 is isolated; It is characterized in that: the said first control electronic circuit comprises first output resistance and first supplying resistance that links to each other with the output terminal of first photoelectrical coupler; The other end of said first supplying resistance connects first power supply, and the other end of said first output resistance is connected with the first zero-detection end; The said second control electronic circuit comprises second output resistance and second supplying resistance that links to each other with the output terminal of second photoelectrical coupler; The other end of said second supplying resistance connects second power supply, and the other end of said second output resistance is connected with the second zero-detection end; Said the 3rd control electronic circuit comprises the 3rd output resistance and the 3rd supplying resistance that links to each other with the output terminal of the 3rd photoelectrical coupler; The other end of said the 3rd supplying resistance connects the 3rd power supply, and the other end of said the 3rd output resistance is connected with the 3rd zero-detection end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205445342U CN202471823U (en) | 2011-12-22 | 2011-12-22 | Photo-coupling isolation line voltage zero-detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205445342U CN202471823U (en) | 2011-12-22 | 2011-12-22 | Photo-coupling isolation line voltage zero-detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202471823U true CN202471823U (en) | 2012-10-03 |
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|---|---|---|---|
| CN2011205445342U Expired - Lifetime CN202471823U (en) | 2011-12-22 | 2011-12-22 | Photo-coupling isolation line voltage zero-detection circuit |
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| CN (1) | CN202471823U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048830A (en) * | 2015-08-25 | 2015-11-11 | 南京工程学院 | Three-phase AC voltage regulation digital control device and control method |
| CN106199156A (en) * | 2016-06-23 | 2016-12-07 | 电子科技大学 | A kind of exchange commutation detection circuit |
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
-
2011
- 2011-12-22 CN CN2011205445342U patent/CN202471823U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048830A (en) * | 2015-08-25 | 2015-11-11 | 南京工程学院 | Three-phase AC voltage regulation digital control device and control method |
| CN106199156A (en) * | 2016-06-23 | 2016-12-07 | 电子科技大学 | A kind of exchange commutation detection circuit |
| CN106199156B (en) * | 2016-06-23 | 2018-10-26 | 电子科技大学 | A kind of exchange commutation detection circuit |
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
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Effective date of registration: 20191029 Address after: 200433 No. 15, No. 323 National Road, Shanghai, Yangpu District Patentee after: Shanghai Rujing Electric Control Technology Co., Ltd Address before: 200433 No. 1803, 1805, 1806, 335 and 1807, building 2, National Road, Yangpu District, Shanghai Patentee before: Shanghai Ruking Electronic Science & Technology Co., Ltd. |
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Granted publication date: 20121003 |
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