CN116345921A - Three-phase voltage generating device for circuit breaker - Google Patents
Three-phase voltage generating device for circuit breaker Download PDFInfo
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- CN116345921A CN116345921A CN202310102372.4A CN202310102372A CN116345921A CN 116345921 A CN116345921 A CN 116345921A CN 202310102372 A CN202310102372 A CN 202310102372A CN 116345921 A CN116345921 A CN 116345921A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
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Abstract
The invention provides a three-phase voltage generating device for a circuit breaker, comprising: a transformation unit and a phase shift unit. The input end of the transformation unit is connected with the output end of the alternating current power supply and is used for reducing the alternating current voltage signal output by the alternating current power supply so as to form a reduced alternating current signal. The input of the phase shift unit is connected with the output of the transformation unit, and the phase shift unit comprises: an A phase shifting subunit, a B phase shifting subunit and a C phase shifting subunit. The A phase shift sub-unit is used for maintaining A phase in alternating current signals the voltage amplitude and the phase angle of the signal are unchanged; the phase B phase shifting subunit is used for keeping the voltage amplitude of the phase B signal in the alternating current signal unchanged, so that the phase angle of the phase B signal lags the phase angle of the phase A signal by 120 degrees. The phase-shifting C phase subunit is used for keeping the voltage amplitude of the phase-C signal in the alternating current signal unchanged, so that the phase angle of the phase-C signal leads the phase angle of the phase-A signal by 120 degrees. Based on the scheme, the problem of voltage drop of the existing patent can be better solved.
Description
Technical Field
The invention relates to the technical field of low-voltage power, in particular to a three-phase voltage generating device for a circuit breaker.
Background
The electronic trip on the circuit breaker in the industry at present usually adopts a special three-phase power supply or an analog output module to realize the trip function simulation test of the protection electronic trip. Both of these approaches, while highly accurate, are relatively costly and bulky. Many users only need to approximately simulate the performance of the electronic release, and high precision is not needed to determine whether the electronic release is normal, so a circuit device capable of generating three-phase voltage and realizing the simulation test of the release function of the electronic release is needed. However, at present, the circuit device mostly adopts a second-order RC phase shifting circuit formed by RC series connection, and the voltage drop can be caused by the phase shifting of the second-order RC phase shifting mode.
Therefore, how to provide a three-phase voltage generating device for a circuit breaker to solve the defect that the prior art is easy to cause voltage drop is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a three-phase voltage generating device for a circuit breaker, which can better solve the problem of voltage drop of the prior patent.
The three-phase voltage generating device for a circuit breaker of the present invention has an input terminal connected to an ac power source and an output terminal connected to an electronic trip unit of the circuit breaker, and comprises: a transformation unit and a phase shifting unit. The input end of the transformation unit is connected with the output end of the alternating current power supply and is used for reducing the alternating current voltage signal output by the alternating current power supply so as to form a reduced alternating current signal; the input end of the phase shifting unit is connected with the output end of the transformation unit, and the phase shifting unit comprises: an A phase shift subunit, configured to keep the voltage amplitude and the phase angle of the A phase signal in the AC signal unchanged; a phase B shifting subunit for maintaining the voltage amplitude of the phase B signal in the ac signal unchanged and making the phase angle of the phase B lag by 120 ° from the phase angle of the phase a signal; and a C-phase shifting subunit for keeping the amplitude of the C-phase signal in the AC signal unchanged and leading the phase angle of the C-phase signal to the phase angle of the A-phase signal by 120 degrees.
In another exemplary embodiment of the three-phase voltage generating device for a circuit breaker of the present invention, further comprising: and the input end of the frequency selecting unit is connected with the output end of the transformation unit, and the output end of the frequency selecting unit is connected with the input end of the phase shifting unit and is used for selecting frequencies of the alternating current signals after the voltage reduction to form alternating current signals after the frequency selection. The frequency selecting unit can enhance the anti-interference capability, provide stable frequency for the phase shifting unit at the rear end and improve the precision of the phase shifting circuit.
In still another exemplary embodiment of the three-phase voltage generating device for a circuit breaker of the present invention, the frequency selecting unit includes: the first resistor, the second resistor, the third resistor, the first rheostat, the first capacitor and the second capacitor; one end of the first resistor is connected with the first output end of the voltage transformation unit, the other end of the first resistor is connected with one end of the second resistor, one fixed terminal of the first rheostat at the other end of the second resistor is connected with the second output end of the voltage transformation unit, one end of the first capacitor is connected with one end of the second resistor, the other end of the first capacitor is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with one end of the first capacitor. The frequency selecting unit with the structure can enable the three-phase voltage generating device to be simple in structure, easy to realize and low in economic cost.
In still another exemplary embodiment of the three-phase voltage generating apparatus for a circuit breaker of the present invention, further comprising: and the input end of the first voltage regulating unit is connected with the output end of the frequency selecting unit, and the output end of the first voltage regulating unit is connected with the input end of the phase shifting unit and is used for regulating the voltage of the alternating current signal after frequency selection. The first voltage regulating unit can realize flexible regulation of alternating current signals.
In another exemplary embodiment of the three-phase voltage generating device for a circuit breaker of the present invention, the first voltage adjusting unit includes a first voltage follower, a fourth resistor, a fifth resistor, a second varistor, and a first inverting amplifier, wherein a negative input terminal of the first voltage follower is connected to the other terminal of the third resistor, a positive input terminal of the first voltage follower is grounded, one terminal of the fourth resistor is connected to an output terminal of the first voltage follower, the other terminal of the fourth resistor is connected to a negative input terminal of the first inverting amplifier, a positive input terminal of the first inverting amplifier is grounded, a second varistor is connected between the negative input terminal and the output terminal of the first inverting amplifier, one terminal of the fifth resistor is connected to an output terminal of the first inverting amplifier, and the other terminal of the first inverting amplifier is connected to an input terminal of the phase shifting unit. The first voltage regulating unit with the structure can enable the three-phase voltage generating device to be simple in structure, easy to realize and low in economic cost.
In a further exemplary embodiment of the three-phase voltage generating device for a circuit breaker according to the present invention, the phase shift unit further comprises an anti-crosstalk unit, the input of which is connected to the output of the first voltage regulating unit, and the output of which is connected to the inputs of the B-phase shift sub-unit and the C-phase shift sub-unit, for equalizing the input voltages of the B-phase shift sub-unit and the C-phase shift sub-unit to the voltage output by the first voltage regulating unit. The crosstalk prevention unit may prevent the crosstalk prevention unit from the input voltage of the crosstalk phase shift unit.
In a further exemplary embodiment of the three-phase voltage generating device for a circuit breaker according to the invention, the a-phase shifting subunit comprises a first voltage follower circuit and a seventh resistor connected between the negative input and the output of the first voltage follower circuit; the crosstalk prevention unit comprises a second voltage follower circuit and a sixth resistor connected between a negative input end and an output end of the second voltage follower circuit; the C-phase shifting subunit comprises a first-order active all-pass differential circuit formed by a third capacitor, an eighth resistor, a ninth resistor, a tenth resistor and a third voltage follower circuit, wherein one end of the third capacitor and one end of the eighth resistor are both connected with the output end of the second voltage follower circuit, the other end of the third capacitor is connected with the positive input end of the third voltage follower circuit, the other end of the eighth resistor is connected with the negative input end of the third voltage follower circuit, one end of the ninth resistor is connected with the positive input end of the third voltage follower circuit, the other end of the ninth resistor is grounded, and the tenth resistor is connected between the negative input end and the output end of the third voltage follower circuit; the B-phase shifting subunit comprises a first-order active all-pass integrating circuit formed by an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor and a fourth voltage follower circuit, wherein one ends of the eleventh resistor and the twelfth resistor are connected with the output end of the second voltage follower circuit, the other end of the eleventh resistor is connected with the positive input end of the fourth voltage follower circuit, the other end of the twelfth resistor is connected with the negative input end of the fourth voltage follower circuit, the thirteenth resistor is connected between the negative input end and the output end of the fourth voltage follower circuit, one end of the fourth capacitor is connected with the positive input end of the fourth voltage follower circuit, and the other end of the fourth capacitor is grounded. The phase shifting unit with the structure can enable the three-phase voltage generating device to be simple in structure, easy to realize and low in economic cost.
In still another exemplary embodiment of the three-phase voltage generating apparatus for a circuit breaker of the present invention, further comprising: and the input end of the second voltage regulation is connected with the output end of the phase shifting unit and is used for regulating each phase voltage output by the phase shifting unit. The second voltage regulation may enable flexible regulation of each phase voltage signal.
In a further exemplary embodiment of the three-phase voltage generating device for a circuit breaker according to the present invention, the second voltage regulation comprises: an A-phase voltage regulating subunit for regulating the A-phase voltage output by the A-phase shifting subunit; the A-phase voltage regulating subunit comprises a fourteenth resistor, a fifteenth resistor, a third resistor and a second inverting amplifier, wherein one end of the fourteenth resistor is connected with the output end of the first voltage follower circuit, the other end of the fourteenth resistor is connected with the negative input end of the second inverting amplifier, one end of the fifteenth resistor is connected with the negative input end of the second inverting amplifier, the other end of the fifteenth resistor is connected with a fixed terminal of the third rheostat, the other fixed terminal of the third rheostat is connected with the output end of the second inverting amplifier, and the positive input end of the second inverting amplifier is grounded; a C-phase voltage regulating subunit for regulating the C-phase voltage output by the C-phase shifting subunit; the C-phase voltage regulating subunit comprises a sixteenth resistor, a seventeenth resistor, a fourth resistor and a third inverting amplifier, wherein one end of the sixteenth resistor is connected with the output end of the third voltage follower circuit, the other end of the sixteenth resistor is connected with the negative input end of the third inverting amplifier, one end of the seventeenth resistor is connected with the negative input end of the third inverting amplifier, the other end of the seventeenth resistor is connected with a fixed terminal of the fourth rheostat, the other fixed terminal of the fourth rheostat is connected with the output end of the third inverting amplifier, and the positive input end of the third inverting amplifier is grounded; and a B-phase voltage regulating subunit for regulating the B-phase voltage output by the B-phase shifting subunit; the B-phase voltage regulating subunit comprises an eighteenth resistor, a nineteenth resistor, a fifth resistor and a fourth inverting amplifier, wherein one end of the eighteenth resistor is connected with the output end of the fourth voltage follower circuit, the other end of the eighteenth resistor is connected with the negative input end of the fourth inverting amplifier, one end of the nineteenth resistor is connected with the negative input end of the fourth inverting amplifier, the other end of the nineteenth resistor is connected with a fixed terminal of the fifth varistor, the other fixed terminal of the fifth varistor is connected with the fourth inverting amplifier, and the positive input end of the fourth inverting amplifier is grounded. The second voltage regulating unit with the structure can enable the three-phase voltage generating device to be simple in structure, easy to realize and low in economic cost.
In a further exemplary embodiment of the three-phase voltage generating device for a circuit breaker according to the present invention, the second voltage regulating unit includes: the A-phase voltage regulating subunit comprises a fourteenth resistor, a fifteenth resistor, a third resistor and a first positive-phase amplifier, wherein one end of the fourteenth resistor is connected with the output end of the first voltage follower circuit, the other end of the fourteenth resistor is connected with the positive input end of the first positive-phase amplifier, one end of the fifteenth resistor and one fixed terminal of the third varistor are both connected with the negative input end of the first positive-phase amplifier, the other end of the fifteenth resistor is grounded, and the other fixed terminal of the third varistor is connected with the output end of the first positive-phase amplifier; the C-phase regulating subunit comprises a sixteenth resistor, a seventeenth resistor, a fourth resistor and a second positive-phase amplifier, wherein one end of the sixteenth resistor is connected with the output end of the second voltage follower circuit, the other end of the sixteenth resistor is connected with the positive input end of the second positive-phase amplifier, one end of the seventeenth resistor and one fixed terminal of the fourth varistor are both connected with the negative input end of the second positive-phase amplifier, the other end of the seventeenth resistor is grounded, and the other fixed terminal of the fourth varistor is connected with the output end of the second positive-phase amplifier; the B-phase adjusting subunit comprises an eighteenth resistor, a nineteenth resistor, a fifth resistor and a third positive-phase amplifier, one end of the eighteenth resistor is connected with the output end of the fourth voltage follower circuit, the other end of the eighteenth resistor is connected with the positive input end of the third positive-phase amplifier, one end of the seventeenth resistor and a fixed wiring terminal of the fourth varistor are both connected with the negative input end of the third positive-phase amplifier, the other end of the nineteenth resistor is grounded, and the other fixed wiring terminal of the fifth varistor is connected with the output end of the third positive-phase amplifier. The second voltage regulating unit with the structure can enable the three-phase voltage generating device to be simple in structure, easy to realize and low in economic cost.
In still another exemplary embodiment of the three-phase voltage generating apparatus for a circuit breaker of the present invention, further comprising: the input end of the differential output unit is connected with the input end of the second voltage regulation, and the output end of the differential output unit is connected with the electronic release of the circuit breaker and is used for outputting the A-phase voltage signal, the B-phase voltage signal and the C-phase voltage signal of the second voltage regulation in a single-ended to differential mode; the differential output unit includes: an A-phase differential output subunit, the input end of which is connected with the output end of the A-phase voltage regulating subunit; the input end of the phase difference C sub-unit is connected with the output end of the phase C voltage regulating sub-unit; and the input end of the phase B phase difference output subunit is connected with the output end of the phase B voltage regulating subunit. The differential output unit can improve the anti-interference capability.
In yet another exemplary embodiment of the three-phase voltage generating apparatus for a circuit breaker of the present invention, the a-phase differential output subunit includes a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and a fully differential operational amplifier, wherein one end of the twentieth resistor is connected to an output end of the second inverting amplifier or the first positive phase amplifier, the other end of the twentieth resistor is connected to a positive input end of the fully differential operational amplifier, the first twenty-first resistor is connected between a positive input end and a negative output end of the fully differential operational amplifier, one end of the twenty-second resistor is connected to a negative input end of the fully differential operational amplifier, the other end of the twenty-second resistor is grounded, and the twenty-third resistor is connected between a negative input end and a positive output end of the fully differential operational amplifier; the C phase difference output subunit comprises a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor and a fully-differential operational amplifier, wherein one end of the twenty-fourth resistor is connected with the output end of the third inverting amplifier or the second positive inverting amplifier, the other end of the twenty-fourth resistor is connected with the positive input end of the fully-differential operational amplifier, the twenty-fifth resistor is connected between the positive input end and the negative output end of the fully-differential operational amplifier, one end of the twenty-seventh resistor is connected with the negative input end of the fully-differential operational amplifier, the other end of the twenty-seventh resistor is grounded, and the twenty-sixth resistor is connected between the negative input end and the positive output end of the fully-differential operational amplifier; the phase difference output subunit comprises a twenty eighth resistor, a twenty ninth resistor, a thirty third resistor, a thirty first resistor and a full-differential operational amplifier, wherein one end of the twenty eighth resistor is connected with the output end of the fourth inverting amplifier or the third positive phase amplifier, the twenty ninth resistor is connected between the positive input end and the negative output end of the full-differential operational amplifier, one end of the thirty first resistor is connected with the negative input end of the full-differential operational amplifier, the other end of the thirty first resistor is grounded, and the thirty third resistor is connected between the negative input end and the positive output end of the full-differential operational amplifier. The differential output unit with the structure can enable the three-phase voltage generating device to be simple in structure, easy to realize and low in economic cost.
Drawings
Fig. 1 is a schematic diagram illustrating an exemplary structure of a three-phase voltage generating apparatus for a circuit breaker according to the present invention.
Fig. 2 shows a schematic diagram of a simulation of AC phase angle differences of a three-phase voltage generating device for a circuit breaker according to the present invention.
Fig. 3 shows a schematic diagram of the simulation of the AB phase angle difference of the three-phase voltage generating device for a circuit breaker according to the present invention.
Fig. 4 shows a circuit implementation diagram of the three-phase voltage generating device for a circuit breaker according to the present invention.
Fig. 5 shows another circuit implementation diagram of the second voltage regulating unit in the three-phase voltage generating device for a circuit breaker according to the present invention.
List of reference numerals:
1. three-phase voltage generating device
2. AC power supply
11. Transformation unit
12. Phase shift unit
13. Frequency selecting unit
14. First voltage regulating unit
15. Second voltage regulating unit
16. Differential output unit
121 A-phase shifting subunit
123 B phase shift subunit
122 C phase shift subunit
124. Anti-crosstalk unit
151 A-phase voltage regulator subunit
153 Phase B voltage regulator subunit
152 C-phase voltage regulator subunit
161 A-phase differential output subunit
163 B phase difference output subunit
162 C phase difference output subunit
Detailed Description
In order to better understand the technical solutions in the embodiments of the present application, the following will be combined with the present application
The drawings in the embodiments are for clarity and detailed description of the technical solutions in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the embodiments of the present application shall fall within the scope of protection of the embodiments of the present application.
It should be understood that the terms "first," "second," and "third," etc. in the claims, specification and drawings of the present disclosure are used for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises" and "comprising" when used in the specification and claims of the present disclosure, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present disclosure is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. As used in the specification and claims of this disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the present disclosure and claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, an input end of a three-phase voltage generating device 1 is connected to an ac power source 2, and an output end of the three-phase voltage generating device 1 is connected to an electronic trip of the circuit breaker to inject current into a current input end of the electronic trip of the circuit breaker, and when the injected current exceeds a preset threshold value, the electronic trip trips.
With continued reference to fig. 1, the three-phase voltage generating device 1 includes a transforming unit 11 and a phase shifting unit 12.
The input end of the transformation unit 11 is connected with the output end of the alternating current power supply 2. In this embodiment, the voltage transforming unit 11 is configured to step down the ac voltage signal output by the ac power supply 2 to form a stepped down ac signal.
The input end of the phase shifting unit 12 is connected with the output end of the transformation unit 11. In the present embodiment, the phase shifting unit 12 is used for shifting the phase of the ac signal after the step-down.
In order to realize the novel phase shifting mode and solve the voltage drop problem, the phase shifting unit 12 includes an a-phase shifting subunit 121, a B-phase shifting subunit 123 and a C-phase shifting subunit 122.
In this embodiment, the a-phase shifting subunit 121 is configured to keep the voltage amplitude and the phase angle of the a-phase signal in the ac signal unchanged. The B phase shifting subunit 123 is configured to keep the voltage amplitude of the B phase signal in the ac signal unchanged, and delay the phase angle of the B phase signal by 120 ° with respect to the phase angle of the a phase signal. The C-phase shifting subunit 122 is configured to keep the amplitude of the voltage of the C-phase signal in the ac signal unchanged, and advance the phase angle of the C-phase signal by 120 ° with respect to the phase angle of the a-phase signal. In this embodiment, the C-phase shifting sub-unit 122 maintains the voltage amplitude of the C-phase signal in the AC signal unchanged by using a first-order active all-pass differential circuit, and advances the phase angle of the C-phase signal by 120 ° to the phase angle of the a-phase signal, as shown in the simulation schematic of the AC phase angle difference of the three-phase voltage generating apparatus shown in fig. 2.
Specifically, the transfer function of the first-order active all-pass differential circuit is;
the phase shift angle of the first-order active all-pass differential circuit can be calculated according to the formula (1) as follows:
θ＝180-2 tan -1 WRC formula (2)
Wherein, w=2pi f, s=jw, and the amplitude of the first-order active all-pass differential circuit can be calculated according to the formula (1): |a (f) |=1. Therefore, the introduction of the first-order active all-pass differential circuit can better solve the problem of patent voltage drop.
In this embodiment, the B-phase shifting subunit 123 maintains the voltage amplitude of the B-phase signal in the ac signal unchanged by using a first-order active all-pass integrated circuit, and delays the phase angle of the B-phase signal by 120 ° from the phase angle of the a-phase signal, as shown in a schematic diagram of the AB phase angle difference of the three-phase voltage generating apparatus shown in fig. 3.
Specifically, the transfer function of the first-order active all-pass integrating circuit is:
the phase shift angle of the first-order active all-pass integrated circuit can be calculated according to the formula (3) as follows:
θ＝-2 tan -1 WRC formula (4)
Calculating the amplitude of the first-order active all-pass integrated circuit according to the formula (3): |a (f) |=1. Therefore, the introduction of the first-order active all-pass integrating circuit can better solve the problem of patent voltage drop.
With continued reference to fig. 1, in order to enhance the anti-interference capability, a stable frequency is provided for the phase shifting unit at the rear end, so as to improve the accuracy of the phase shifting circuit, as shown in fig. 1, the three-phase voltage generating apparatus 1 further includes a frequency selecting unit 13, an input end of which is connected to an output end of the transforming unit 11, and an output end of which is connected to an input end of the phase shifting unit 12. The frequency selecting unit 13 is configured to select frequencies of the ac signal after the step-down to form an ac signal after the frequency selection. The frequency selecting unit 13 of the embodiment adopts a narrow-band filter circuit, so that signals higher than and lower than the center frequency can be attenuated, and the frequency selection of 50Hz signals is realized.
In order to make the three-phase voltage generating device simple in structure, easy to implement and low in economic cost, please refer to fig. 4, which shows a circuit implementation diagram of the three-phase voltage generating device. As shown in fig. 4, the frequency selecting unit 13 includes a first resistor R1, a second resistor R2, a third resistor R3, a first varistor P1, a first capacitor C1 and a second capacitor C2, wherein one end of the first resistor R1 is connected to the first output end of the transformer unit 11, the other end of the first resistor R1 is connected to one end of the second resistor R2, a fixed terminal of the first varistor P1 at the other end of the second resistor R2 is connected to the second output end of the transformer unit 11, the other fixed terminal of the first varistor P1 is connected to one end of the second resistor R2, the other end of the first capacitor C1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the first capacitor One end of C1 is connected. In the present embodiment, the first resistor R1, the second resistor R2, the third resistor R3, the first varistor P1, the first capacitor C1 and the second capacitor C2 determine the center frequency f, i.e
With continued reference to fig. 1, to achieve flexible regulation of the ac signal, the three-phase voltage generating device 1 further comprises a first voltage regulating unit 14. The input end of the first voltage regulating unit 14 is connected with the output end of the frequency selecting unit 13, and the output end of the first voltage regulating unit 14 is connected with the input end of the phase shifting unit 12 so as to regulate the voltage of the alternating current signal after frequency selection and realize the amplification of the voltage of the alternating current signal.
With continued reference to fig. 4, in order to implement the three-phase voltage generating device with a simple structure, easy implementation and low cost, the first voltage adjusting unit 14 includes a first voltage follower IOP1, a fourth resistor R4, a fifth resistor R5, a second varistor P2 and a first inverting amplifier IOP2. In the present embodiment, the impedance matching of the third resistor R3 is realized by the first voltage follower IOP1, and the output voltage is adjusted by the first inverting amplifier IOP2 and the adjustment of the resistance value of the second varistor P2. The negative input end of the first voltage follower IOP1 is connected with the other end of the third resistor R3, the positive input end of the first voltage follower IOP1 is grounded, one end of the fourth resistor R4 is connected with the output end of the first voltage follower IOP1, the other end of the fourth resistor R4 is connected with the negative input end of the first inverting amplifier IOP2, the positive input end of the first inverting amplifier IOP2 is grounded, the second rheostat P2 is connected between the negative input end and the output end of the first inverting amplifier IOP2, one end of the fifth resistor R5 is connected with the output end of the first inverting amplifier IOP2, and the other end of the first inverting amplifier IOP2 is connected with the input end of the phase shifting unit 12.
To prevent crosstalk of the input voltages of the phase shift unit, the phase shift unit 12 further comprises an anti-crosstalk unit 124. An input terminal of the crosstalk prevention unit 124 is connected to an output terminal of the first voltage adjustment unit 14, and an output terminal of the crosstalk prevention unit 124 is connected to input terminals of the C phase shift sub-unit 122 and the B phase shift sub-unit 123. The crosstalk prevention unit 124 is configured to make the input voltages of the C-phase shifting subunit 122 and the B-phase shifting subunit 123 equal to the voltage output by the first voltage adjusting unit 14.
In order to realize the three-phase voltage generating device with simple structure, easy implementation and low economic cost, the specific circuit of the phase shifting unit 12 is shown in fig. 4:
the a-phase shifting subunit 121 includes a first voltage follower circuit IOP3 and a seventh resistor R7 connected between the negative input terminal and the output terminal of the first voltage follower circuit IOP 3.
The crosstalk prevention unit 124 includes a second voltage follower circuit IOP4 and a sixth resistor R6 connected between a negative input terminal and an output terminal of the second voltage follower circuit IOP 4. The output signal of the second voltage follower circuit IOP4 is divided into two paths, wherein the first path keeps the voltage amplitude unchanged and the phase is advanced by 120 ° through the C-phase shifting subunit 122 consisting of the first-order active all-pass differential circuit. The second path passes through a B-phase shifting subunit 123 consisting of a first order active all-pass integrating circuit, keeping the voltage amplitude unchanged, with a phase lag of 120 °.
The C-phase shifting subunit 122 includes a first-order active all-pass differential circuit composed of a third capacitor C3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a third voltage follower circuit IOP5, where one end of the third capacitor C3 and one end of the eighth resistor R8 are both connected to the output end of the second voltage follower circuit IOP4, the other end of the third capacitor C3 is connected to the positive input end of the third voltage follower circuit IOP5, the other end of the eighth resistor R8 is connected to the negative input end of the third voltage follower circuit IOP5, one end of the ninth resistor R9 is connected to the positive input end of the third voltage follower circuit IOP5, the other end of the ninth resistor R9 is grounded, and the tenth resistor R10 is connected between the negative input end and the output end of the third voltage follower circuit IOP 5.
The B-phase shifting subunit 123 includes a first-order active all-pass integrating circuit composed of an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourth capacitor C4 and a fourth voltage follower circuit IOP6, where one ends of the eleventh resistor R11 and the twelfth resistor R12 are both connected to the output end of the second voltage follower circuit IOP4, the other end of the eleventh resistor R11 is connected to the positive input end of the fourth voltage follower circuit IOP6, the other end of the twelfth resistor R12 is connected to the negative input end of the fourth voltage follower circuit IOP6, the thirteenth resistor R13 is connected between the negative input end and the output end of the fourth voltage follower circuit IOP6, one end of the fourth capacitor C4 is connected to the positive input end of the fourth voltage follower circuit IOP6, and the other end of the fourth capacitor C4 is grounded.
With continued reference to fig. 1, in order to achieve flexible adjustment of the voltage signal of each phase, to enhance the immunity, the three-phase voltage generating device 1 further comprises a second voltage adjusting unit 15. The input terminal of the second voltage regulator 15 is connected to the output terminal of the phase shift unit 12, and is used for regulating each phase voltage output by the phase shift unit 12. In the present embodiment, the second voltage adjustment 15 includes: an a-phase voltage regulation subunit 151, a C-phase voltage regulation subunit 152, and a B-phase voltage regulation subunit 153.
In this embodiment, the a-phase voltage adjusting subunit 151 is configured to adjust the a-phase voltage output by the a-phase shifting subunit 121. The C-phase voltage adjustment subunit 152 is configured to adjust the C-phase voltage output by the C-phase shifting subunit 122. The B-phase voltage adjusting subunit 153 is configured to adjust the B-phase voltage output by the B-phase shifting subunit 123.
In order to realize the three-phase voltage generating device with simple structure, easy implementation and low economic cost, the specific circuit of the second voltage adjusting unit 15 is shown in fig. 4:
the a-phase voltage adjusting subunit 151 is configured to adjust the a-phase voltage output by the a-phase shifting subunit 121. The a-phase voltage adjusting subunit 151 includes a fourteenth resistor R14, a fifteenth resistor R15, a third resistor P3, and a second inverting amplifier IOP7. In the present embodiment, the a-phase voltage is amplified by the third resistor P3 and the second inverting amplifier IOP7. The specific structure of the a-phase voltage regulator subunit 151 is: one end of a fourteenth resistor R14 is connected with the output end of the first voltage follower circuit IOP3, the other end of the fourteenth resistor R14 is connected with the negative input end of the second inverting amplifier IOP7, one end of a fifteenth resistor R15 is connected with the negative input end of the second inverting amplifier IOP7, the other end of the fifteenth resistor R15 is connected with one fixed wiring terminal of the third rheostat P3, the other fixed wiring terminal of the third rheostat P3 is connected with the output end of the second inverting amplifier IOP7, and the positive input end of the second inverting amplifier IOP7 is grounded.
The C-phase voltage adjustment subunit 152 is configured to adjust the C-phase voltage output by the C-phase shifting subunit 122. The C-phase voltage regulating subunit 152 includes a sixteenth resistor R16, a seventeenth resistor R17, a fourth resistor P4, and a third inverting amplifier IOP8. In the present embodiment, the C-phase voltage is amplified by the fourth resistor P4 and the third inverting amplifier IOP8. The specific structure of the C-phase voltage regulator subunit 152 is: one end of a sixteenth resistor R16 is connected with the output end of the third voltage follower circuit IOP5, the other end of the sixteenth resistor R16 is connected with the negative input end of the third inverting amplifier IOP8, one end of a seventeenth resistor R17 is connected with the negative input end of the third inverting amplifier IOP8, the other end of the seventeenth resistor R17 is connected with one fixed wiring terminal of a fourth rheostat P4, the other fixed wiring terminal of the fourth rheostat P4 is connected with the output end of the third inverting amplifier IOP8, and the positive input end of the third inverting amplifier IOP8 is grounded.
The B-phase voltage adjusting subunit 153 is configured to adjust the B-phase voltage output by the B-phase shifting subunit 123. The B-phase voltage adjusting subunit 153 includes an eighteenth resistor R18, a nineteenth resistor R19, a fifth resistor P5, and a fourth inverting amplifier IOP9. In the present embodiment, the C-phase voltage is amplified by the fifth varistor P5 and the fourth inverting amplifier IOP9. The specific structure of the B-phase adjusting subunit 153 is: one end of an eighteenth resistor R18 is connected with the output end of the fourth voltage follower circuit IOP6, the other end of the eighteenth resistor R18 is connected with the negative input end of the fourth inverting amplifier IOP9, one end of a nineteenth resistor R19 is connected with the negative input end of the fourth inverting amplifier IOP9, the other end of the nineteenth resistor R19 is connected with one fixed terminal of the fifth varistor P5, the other fixed terminal of the fifth varistor P5 is connected with the fourth inverting amplifier IOP9, and the positive input end of the fourth inverting amplifier IOP9 is grounded.
Referring to fig. 5, another circuit implementation diagram for the second voltage regulation is shown. As shown in fig. 5, the a-phase voltage adjusting subunit 151 includes a fourteenth resistor R14, a fifteenth resistor R15, a third resistor P3, and a first positive phase amplifier IOP7, where one end of the fourteenth resistor R14 is connected to the output end of the first voltage follower circuit IOP3, the other end of the fourteenth resistor R14 is connected to the positive input end of the first positive phase amplifier IOP7, one end of the fifteenth resistor R15 and one fixed terminal of the third resistor P3 are both connected to the negative input end of the first positive phase amplifier IOP7, the other end of the fifteenth resistor R15 is grounded, and the other fixed terminal of the third resistor P3 is connected to the output end of the first positive phase amplifier IOP 7.
The C-phase adjusting subunit 152 includes a sixteenth resistor R16, a seventeenth resistor R17, a fourth resistor P4, and a second normal phase amplifier IOP8, where one end of the sixteenth resistor R16 is connected to the output end of the second voltage follower circuit IOP4, the other end of the sixteenth resistor R16 is connected to the positive input end of the second normal phase amplifier IOP8, one end of the seventeenth resistor R17 and one fixed terminal of the fourth resistor P4 are both connected to the negative input end of the second normal phase amplifier IOP8, the other end of the seventeenth resistor R17 is grounded, and the other fixed terminal of the fourth resistor P4 is connected to the output end of the second normal phase amplifier IOP 8.
The B-phase adjusting subunit 153 includes an eighteenth resistor R18, a nineteenth resistor R19, a fifth resistor P5, and a third normal phase amplifier IOP9, where one end of the eighteenth resistor R18 is connected to the output end of the fourth voltage follower IOP5, the other end of the eighteenth resistor R18 is connected to the positive input end of the third normal phase amplifier IOP9, one end of the seventeenth resistor R17 and one fixed terminal of the fourth varistor P4 are both connected to the negative input end of the third normal phase amplifier IOP9, the other end of the nineteenth resistor R19 is grounded, and the other fixed terminal of the fifth varistor P9 is connected to the output end of the third normal phase amplifier IOP 9.
With continued reference to fig. 1, to enhance the anti-interference capability, the three-phase voltage generating device 1 further includes a differential output unit 16. The input end of the differential output unit 16 is connected with the input end of the second voltage regulation 15, and the output end of the differential output unit 16 is connected with an electronic trip of the circuit breaker. The differential output unit 16 is configured to output the a-phase voltage signal, the C-phase voltage signal, and the B-phase voltage signal adjusted by the second voltage adjustment 15 in a single-ended to differential manner. Specifically, the differential output unit 16 implements an A-phase voltage/C-phase voltage/B-phase voltage output of 0-10VAC.
In order to realize differential output of the a phase, the C phase, and the B phase, respectively, the differential output unit 16 includes: an a-phase difference output subunit 161, a C-phase difference output subunit 162, and a B-phase difference output subunit 163.
The input end of the phase a differential output subunit 161 is connected with the output end of the phase a voltage regulating subunit 151, and the output end of the phase a differential output subunit 161 is connected with an electronic trip of the circuit breaker. The input end of the phase difference output subunit 162 is connected with the output end of the phase difference voltage regulating subunit 152, and the output end of the phase difference output subunit 162 is connected with the electronic release of the circuit breaker. The input end of the phase difference output subunit 163 is connected with the output end of the phase difference voltage regulating subunit 153, and the output end of the phase difference output subunit 163 is connected with an electronic release of the circuit breaker.
With continued reference to fig. 4, the connection structure of the phase-a differential output subunit 161, the phase-C differential output subunit 162 and the phase-B differential output subunit 163 is shown in fig. 4, where the phase-a differential output subunit 161 includes a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23 and a fully differential operational amplifier U1, where one end of the twentieth resistor R20 is connected to the output end of the second inverting amplifier IOP7 or the first positive phase amplifier IOP7, the other end of the twentieth resistor R20 is connected to the positive input end of the fully differential operational amplifier U1, the twenty-first resistor R21 is connected between the positive input end and the negative output end of the fully differential operational amplifier U1, one end of the twenty-second resistor R22 is connected to the negative input end of the fully differential operational amplifier U1, the other end of the twenty-second resistor R22 is grounded, and the twenty-third resistor R23 is connected between the negative input end and the positive output end of the fully differential operational amplifier U1.
The C phase difference output subunit 162 includes a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, and a fully differential operational amplifier U2, where one end of the twenty-fourth resistor R24 is connected to the output end of the third inverting amplifier IOP8 or the second non-inverting amplifier IOP8, the other end of the twenty-fourth resistor R24 is connected to the positive input end of the fully differential operational amplifier U2, the twenty-fifth resistor R25 is connected between the positive input end and the negative output end of the fully differential operational amplifier U2, one end of the twenty-seventh resistor R27 is connected to the negative input end of the fully differential operational amplifier U2, the other end of the twenty-seventh resistor R27 is grounded, and the twenty-sixth resistor R26 is connected between the negative input end and the positive output end of the fully differential operational amplifier U2.
The phase difference output subunit 163 includes a twenty eighth resistor R28, a twenty ninth resistor R29, a thirty first resistor R30, a thirty first resistor R31, and a fully differential operational amplifier U3, where one end of the twenty eighth resistor R28 is connected to the output end of the fourth inverting amplifier IOP9 or the third positive phase amplifier IOP9, the twenty ninth resistor R29 is connected between the positive input end and the negative output end of the fully differential operational amplifier U3, one end of the thirty first resistor R31 is connected to the negative input end of the fully differential operational amplifier U3, the other end of the thirty first resistor R31 is grounded, and the thirty first resistor R30 is connected between the negative input end and the positive output end of the fully differential operational amplifier U3.
The three-phase voltage generating device for the circuit breaker provided by the embodiment is based on the resistor and the capacitor, and the operational amplifier realizes a simple three-phase voltage circuit.
The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the disclosure be covered by the claims of this application. Nouns and pronouns for humans in this patent application are not limited to a particular gender.
Claims (12)
1. A three-phase voltage generating device for a circuit breaker, characterized in that its input is connected to an ac power source (2) and its output is connected to an electronic trip of the circuit breaker, the three-phase voltage generating device for a circuit breaker comprising:
the input end of the transformation unit (11) is connected with the output end of the alternating current power supply (2) and is used for reducing the alternating current voltage signal output by the alternating current power supply (2) so as to form a reduced alternating current signal;
A phase shift unit (12) having an input connected to an output of the transformation unit (11), the phase shift unit (12) comprising:
an a-phase shifting subunit (121) for maintaining the voltage amplitude and the phase angle of the a-phase signal in the ac signal unchanged;
a phase B shifting subunit (123) for maintaining the voltage amplitude of the phase B signal in the ac signal unchanged and for delaying the phase angle of the phase B signal by 120 ° from the phase angle of the phase a signal; a kind of electronic device with high-pressure air-conditioning system
And a C-phase shifting subunit (122) for maintaining the amplitude of the C-phase signal in the AC signal unchanged and advancing the phase angle of the C-phase signal by 120 DEG with respect to the phase angle of the A-phase signal.
2. The three-phase voltage generating apparatus for a circuit breaker according to claim 1, further comprising:
and the input end of the frequency selecting unit (13) is connected with the output end of the transformation unit (11), and the output end of the frequency selecting unit is connected with the input end of the phase shifting unit (12) and is used for selecting frequencies of the alternating current signals after voltage reduction to form alternating current signals after frequency selection.
3. The three-phase voltage generating apparatus for a circuit breaker according to claim 2, wherein,
the frequency selection unit (13) includes: a first resistor (R1), a second resistor (R2), a third resistor (R3), a first varistor (P1), a first capacitor (C1) and a second capacitor (C2); one end of a first resistor (R1) is connected with a first output end of the voltage transformation unit (11), the other end of the first resistor (R1) is connected with one end of a second resistor (R2), a fixed wiring end of a first rheostat (P1) at the other end of the second resistor (R2) is connected with a fixed wiring end of the first rheostat (P1) and is connected with a second output end of the voltage transformation unit (11), one end of a first capacitor (C1) is connected with one end of the second resistor (R2), the other end of the first capacitor (C1) is connected with one end of a third resistor (R3), the other end of the third resistor (R3) is connected with one end of a second capacitor (C2), and the other end of the second capacitor (C2) is connected with one end of the first capacitor (C1).
4. The three-phase voltage generating apparatus for a circuit breaker according to claim 3, further comprising:
and the input end of the first voltage regulating unit (14) is connected with the output end of the frequency selecting unit (13), and the output end of the first voltage regulating unit is connected with the input end of the phase shifting unit (12) and is used for regulating the voltage of the alternating current signal after frequency selection.
5. The three-phase voltage generating apparatus for a circuit breaker according to claim 4, wherein,
the first voltage regulating unit (14) comprises a first voltage follower (IOP 1), a fourth resistor (R4), a fifth resistor (R5), a second rheostat (P2) and a first inverting amplifier (IOP 2), wherein the negative input end of the first voltage follower (IOP 1) is connected with the other end of the third resistor (R3), the positive input end of the first voltage follower (IOP 1) is grounded, one end of the fourth resistor (R4) is connected with the output end of the first voltage follower (IOP 1), the other end of the fourth resistor (R4) is connected with the negative input end of the first inverting amplifier (IOP 2), the positive input end of the first inverting amplifier (IOP 2) is grounded, the negative input end of the first inverting amplifier (IOP 2) is connected with the output end of the second rheostat (P2), and one end of the fifth resistor (R5) is connected with the output end of the first inverting amplifier (IOP 2), and the other end of the first inverting amplifier (IOP 2) is connected with the input end of the phase shifting unit (12).
6. The three-phase voltage generating apparatus for a circuit breaker according to claim 5, wherein the phase shifting unit (12) further comprises an anti-crosstalk unit (124) having an input connected to the output of the first voltage adjusting unit (14) and an output connected to the input of the B-phase shifting subunit (123) and the C-phase shifting subunit (122) for equalizing the input voltages of the B-phase shifting subunit (123) and the C-phase shifting subunit (122) to the voltage output from the first voltage adjusting unit (14).
7. The three-phase voltage generating apparatus for a circuit breaker according to claim 6, wherein,
the A-phase shifting subunit (121) comprises a first voltage follower circuit (IOP 3) and a seventh resistor (R7) connected between a negative input end and an output end of the first voltage follower circuit (IOP 3);
the crosstalk prevention unit (124) comprises a second voltage follower circuit (IOP 4) and a sixth resistor (R6) connected between a negative input end and an output end of the second voltage follower circuit (IOP 4);
the C-phase shifting subunit (122) comprises a first-order active all-pass differential circuit consisting of a third capacitor (C3), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10) and a third voltage follower circuit (IOP 5), wherein one end of the third capacitor (C3) and one end of the eighth resistor (R8) are both connected with the output end of the second voltage follower circuit (IOP 4), the other end of the third capacitor (C3) is connected with the positive input end of the third voltage follower circuit (IOP 5), the other end of the eighth resistor (R8) is connected with the negative input end of the third voltage follower circuit (IOP 5), one end of the ninth resistor (R9) is connected with the positive input end of the third voltage follower circuit (IOP 5), and the other end of the ninth resistor (R9) is grounded, and the tenth resistor (R10) is connected between the negative input end and the output end of the third voltage follower circuit (IOP 5);
The B-phase shifting subunit (123) comprises a first-order active all-pass integrating circuit consisting of an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourth capacitor (C4) and a fourth voltage follower circuit (IOP 6), wherein one end of the eleventh resistor (R11) and one end of the twelfth resistor (R12) are both connected with the output end of the second voltage follower circuit (IOP 4), the other end of the eleventh resistor (R11) is connected with the positive input end of the fourth voltage follower circuit (IOP 6), the other end of the twelfth resistor (R12) is connected with the negative input end of the fourth voltage follower circuit (IOP 6), the thirteenth resistor (R13) is connected between the negative input end and the output end of the fourth voltage follower circuit (IOP 6), one end of the fourth capacitor (C4) is connected with the positive input end of the fourth voltage follower circuit (IOP 6), and the other end of the fourth capacitor (C4) is grounded.
8. The three-phase voltage generating apparatus for a circuit breaker according to claim 7, further comprising:
and a second voltage regulator (15) having an input terminal connected to the output terminal of the phase shift unit (12) for regulating each phase voltage outputted from the phase shift unit (12).
9. The three-phase voltage generating device for a circuit breaker according to claim 8, wherein the second voltage regulating unit (15) comprises:
An A-phase voltage adjustment subunit (151) for adjusting the A-phase voltage outputted from the A-phase shifting subunit (121); the A-phase voltage regulating subunit (151) comprises a fourteenth resistor (R14), a fifteenth resistor (R15), a third resistor (P3) and a second inverting amplifier (IOP 7), wherein one end of the fourteenth resistor (R14) is connected with the output end of the first voltage follower circuit (IOP 3), the other end of the fourteenth resistor (R14) is connected with the negative input end of the second inverting amplifier (IOP 7), one end of the fifteenth resistor (R15) is connected with the negative input end of the second inverting amplifier (IOP 7), the other end of the fifteenth resistor (R15) is connected with one fixed terminal of the third varistor (P3), the other fixed terminal of the third varistor (P3) is connected with the output end of the second inverting amplifier (IOP 7), and the positive input end of the second inverting amplifier (IOP 7) is grounded;
a C-phase voltage adjustment subunit (152) for adjusting the C-phase voltage output by the C-phase shifting subunit (122); the C-phase voltage regulating subunit (152) comprises a sixteenth resistor (R16), a seventeenth resistor (R17), a fourth resistor (P4) and a third inverting amplifier (IOP 8), wherein one end of the sixteenth resistor (R16) is connected with the output end of the third voltage follower circuit (IOP 5), the other end of the sixteenth resistor (R16) is connected with the negative input end of the third inverting amplifier (IOP 8), one end of the seventeenth resistor (R17) is connected with the negative input end of the third inverting amplifier (IOP 8), the other end of the seventeenth resistor (R17) is connected with one fixed terminal of the fourth varistor (P4), the other fixed terminal of the fourth varistor (P4) is connected with the output end of the third inverting amplifier (IOP 8), and the positive input end of the third inverting amplifier (IOP 8) is grounded; a kind of electronic device with high-pressure air-conditioning system
A B-phase voltage adjusting subunit (153) for adjusting the B-phase voltage outputted from said B-phase shifting subunit (123); the B-phase voltage regulating subunit (153) comprises an eighteenth resistor (R18), a nineteenth resistor (R19), a fifth resistor (P5) and a fourth inverting amplifier (IOP 9), wherein one end of the eighteenth resistor (R18) is connected with the output end of the fourth voltage follower circuit (IOP 6), the other end of the eighteenth resistor (R18) is connected with the negative input end of the fourth inverting amplifier (IOP 9), one end of the nineteenth resistor (R19) is connected with the negative input end of the fourth inverting amplifier (IOP 9), the other end of the nineteenth resistor (R19) is connected with a fixed terminal of the fifth rheostat (P5), and the other fixed terminal of the fifth rheostat (P5) is connected with the fourth inverting amplifier (IOP 9), and the positive input end of the fourth inverting amplifier (IOP 9) is grounded.
10. The three-phase voltage generating device for a circuit breaker according to claim 8, characterized in that the second voltage regulation (15) comprises:
the A-phase voltage regulating subunit (151) comprises a fourteenth resistor (R14), a fifteenth resistor (R15), a third resistor (P3) and a first positive phase amplifier (IOP 7), wherein one end of the fourteenth resistor (R14) is connected with the output end of the first voltage follower circuit (IOP 3), the other end of the fourteenth resistor (R14) is connected with the positive input end of the first positive phase amplifier (IOP 7), one end of the fifteenth resistor (R15) and one fixed terminal of the third varistor (P3) are both connected with the negative input end of the first positive phase amplifier (IOP 7), the other end of the fifteenth resistor (R15) is grounded, and the other fixed terminal of the third varistor (P3) is connected with the output end of the first positive phase amplifier (IOP 7);
The C-phase adjusting subunit (152) comprises a sixteenth resistor (R16), a seventeenth resistor (R17), a fourth resistor (P4) and a second positive phase amplifier (IOP 8), wherein one end of the sixteenth resistor (R16) is connected with the output end of the second voltage follower circuit (IOP 4), the other end of the sixteenth resistor (R16) is connected with the positive input end of the second positive phase amplifier (IOP 8), one end of the seventeenth resistor (R17) and one fixed terminal of the fourth resistor (P4) are both connected with the negative input end of the second positive phase amplifier (IOP 8), the other end of the seventeenth resistor (R17) is grounded, and the other fixed terminal of the fourth resistor (P4) is connected with the output end of the second positive phase amplifier (IOP 8);
the B-phase regulating subunit (153) comprises an eighteenth resistor (R18), a nineteenth resistor (R19), a fifth resistor (P5) and a third normal phase amplifier (IOP 9), one end of the eighteenth resistor (R18) is connected with the output end of the fourth voltage follower circuit (IOP 5), the other end of the eighteenth resistor (R18) is connected with the positive input end of the third normal phase amplifier (IOP 9), one end of the seventeenth resistor (R17) and one fixed terminal of the fourth varistor (P4) are connected with the negative input end of the third normal phase amplifier (IOP 9), the other end of the nineteenth resistor (R19) is grounded, and the other fixed terminal of the fifth varistor (P9) is connected with the output end of the third normal phase amplifier (IOP 9).
11. The three-phase voltage generating apparatus for a circuit breaker according to claim 9 or 10, further comprising:
the input end of the differential output unit (16) is connected with the input end of the second voltage regulator (15), and the output end of the differential output unit is connected with the electronic release of the circuit breaker and is used for outputting the A-phase voltage signal, the C-phase voltage signal and the B-phase voltage signal regulated by the second voltage regulator (15) in a single-ended to differential mode;
the differential output unit (16) includes:
an A-phase differential output subunit (161) having an input connected to the output of the A-phase voltage regulation subunit (151);
a phase difference output subunit (162) with an input connected to the output of the phase C voltage regulator subunit (152); a kind of electronic device with high-pressure air-conditioning system
And the input end of the B phase difference output subunit (163) is connected with the output end of the B phase voltage regulating subunit (153).
12. The three-phase voltage generating apparatus for a circuit breaker according to claim 11, wherein,
the A-phase differential output subunit (161) comprises a twentieth resistor (R20), a twenty-first resistor (R21), a twenty-second resistor (R22), a twenty-third resistor (R23) and a fully differential operational amplifier (U1), wherein one end of the twentieth resistor (R20) is connected with the output end of the second inverting amplifier (IOP 7) or the first positive phase amplifier (IOP 7), the other end of the twentieth resistor (R20) is connected with the positive input end of the fully differential operational amplifier (U1), the twenty-first resistor (R21) is connected between the positive input end and the negative output end of the fully differential operational amplifier (U1), one end of the twenty-second resistor (R22) is connected with the negative input end of the fully differential operational amplifier (U1), the other end of the twenty-second resistor (R22) is grounded, and the twenty-third resistor (R23) is connected between the negative input end and the positive output end of the fully differential operational amplifier (U1);
The C-phase difference output subunit (162) comprises a twenty-fourth resistor (R24), a twenty-fifth resistor (R25), a twenty-sixth resistor (R26), a twenty-seventh resistor (R27) and a fully-differential operational amplifier (U2), wherein one end of the twenty-fourth resistor (R24) is connected with the output end of the third inverting amplifier (IOP 8) or the second positive phase amplifier (IOP 8), the other end of the twenty-fourth resistor (R24) is connected with the positive input end of the fully-differential operational amplifier (U2), the twenty-fifth resistor (R25) is connected between the positive input end and the negative output end of the fully-differential operational amplifier (U2), one end of the twenty-seventh resistor (R27) is connected with the negative input end of the fully-differential operational amplifier (U2), the other end of the twenty-seventh resistor (R27) is grounded, and the twenty-sixth resistor (R26) is connected between the negative input end and the positive output end of the fully-differential operational amplifier (U2);
the phase difference output subunit (163) comprises a twenty eighth resistor (R28), a twenty ninth resistor (R29), a thirty-first resistor (R30), a thirty-first resistor (R31) and a fully differential operational amplifier (U3), wherein one end of the twenty eighth resistor (R28) is connected with the output end of the fourth inverting amplifier (IOP 9) or the third non-inverting amplifier (IOP 9), the twenty ninth resistor (R29) is connected between the positive input end and the negative output end of the fully differential operational amplifier (U3), one end of the thirty-first resistor (R31) is connected with the negative input end of the fully differential operational amplifier (U3), the other end of the thirty-first resistor (R31) is grounded, and the thirty-first resistor (R30) is connected between the negative input end and the positive output end of the fully differential operational amplifier (U3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310102372.4A CN116345921A (en) | 2023-02-13 | 2023-02-13 | Three-phase voltage generating device for circuit breaker |
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| CN202310102372.4A CN116345921A (en) | 2023-02-13 | 2023-02-13 | Three-phase voltage generating device for circuit breaker |
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| CN116345921A true CN116345921A (en) | 2023-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117879611A (en) * | 2024-03-12 | 2024-04-12 | 浙江华昱欣科技有限公司 | Three-phase differential sampling circuit, optimization method thereof and inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117879611A (en) * | 2024-03-12 | 2024-04-12 | 浙江华昱欣科技有限公司 | Three-phase differential sampling circuit, optimization method thereof and inverter |
| CN117879611B (en) * | 2024-03-12 | 2024-06-04 | 浙江华昱欣科技有限公司 | Three-phase differential sampling circuit, optimization method thereof and inverter |
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