CN219657760U - Three-phase voltage monitoring circuit - Google Patents
Three-phase voltage monitoring circuit Download PDFInfo
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- CN219657760U CN219657760U CN202320603639.3U CN202320603639U CN219657760U CN 219657760 U CN219657760 U CN 219657760U CN 202320603639 U CN202320603639 U CN 202320603639U CN 219657760 U CN219657760 U CN 219657760U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 38
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of semiconductor products, and particularly relates to a three-phase voltage monitoring circuit. It comprises the following steps: the input end of the voltage sampling circuit is connected with three-phase voltage, and the voltage sampling circuit comprises: the three sampling branches are respectively connected with the three-phase voltage and comprise a first capacitor and a first resistor which are connected in series and are used for reducing the voltage to acquire three-phase voltage signals; the input end of the three-phase rectifying circuit is connected with the output end of the voltage sampling circuit and is used for rectifying received three-phase electricity so as to output a direct current electric signal; the optical coupling isolation circuit is connected to the output end of the three-phase rectifying circuit through a bus, the output end of the optical coupling isolation circuit is connected with the external sampling circuit, and high-voltage isolation is carried out through the optical coupling isolation circuit so as to control the on-off of the output end of the optical coupling isolation circuit. The utility model is used for solving the problem of circuit reliability reduction caused by high-voltage damage to the control chip.
Description
Technical Field
The utility model belongs to the technical field of semiconductor products, and particularly relates to a three-phase voltage monitoring circuit.
Background
Currently, in a three-phase input high frequency switching power supply, it is often necessary to detect an instantaneous value of an input voltage, for example, in a three-phase power factor correction circuit, to know the instantaneous value of each phase voltage so as to enable a control circuit to correctly control the input current of each phase. Under the condition of zero line access, the reference ground of the control signal can be placed on the zero line, and the voltage of each phase is divided through a resistor, so that the signal of each phase voltage is obtained. However, in the three-phase three-wire zero-wire structure, since no zero wire is used as the reference ground, the reference ground may be any other ground potential, and the respective line voltages need to be subtracted to obtain the corresponding phase voltages, so that the detection circuit is relatively complex.
The direct sampling of ac voltage by resistor voltage division is widely adopted because of the simple circuit, but the resistors connected with high voltage are a problem to be paid attention to, the current of these resistors is very small and the power consumption does not need to be considered particularly, but the voltage across the two ends of the resistor is usually hundreds of volts, so the problems of avoiding high voltage resistor and how to realize the isolation of strong and weak current to protect the control chip, so as to improve the reliability of the whole circuit are needed to be solved at present.
Disclosure of Invention
The technical problem to be solved by the embodiment of the utility model is to overcome the defects of the prior art, and provide a three-phase voltage monitoring circuit which is used for solving the problem of circuit reliability reduction caused by high-voltage damage to a control chip.
The technical scheme for solving the technical problems is as follows: a three-phase voltage monitoring circuit, comprising:
the input of voltage sampling circuit is connected with three-phase voltage, voltage sampling circuit includes: the three sampling branches are respectively connected with three-phase voltage and comprise a first capacitor and a first resistor which are connected in series and are used for reducing the voltage to acquire the three-phase voltage signals;
the input end of the three-phase rectifying circuit is connected with the output end of the voltage sampling circuit and is used for rectifying received three-phase electricity so as to output a direct current electric signal;
the optical coupling isolation circuit is connected to the output end of the three-phase rectifying circuit through a bus, the output end of the optical coupling isolation circuit is connected with the external sampling circuit, and high-voltage isolation is carried out through the optical coupling isolation circuit so as to control the on-off of the output end of the optical coupling isolation circuit.
Compared with the prior art, the technical scheme has the following beneficial effects:
the first capacitor and the first resistor in the voltage sampling circuit are connected in series, so that the collected three-phase voltage is reduced, the effect of reducing the voltage of the subsequent optocoupler isolation circuit is achieved, the three-phase rectification circuit rectifies the reduced alternating current signal into a direct current signal, the direct current signal is transmitted to the optocoupler isolation circuit, high-voltage isolation is carried out through the optocoupler isolation circuit, the output of the optocoupler isolation circuit carries out high-voltage sampling or stops high-voltage sampling according to the on-state or off-state of the optocoupler, and high-voltage isolation is achieved.
Further, the optocoupler isolation circuit includes: the three-phase rectifier circuit comprises an optocoupler U1, wherein a port 1 of the optocoupler U1 is connected with a direct current power supply through a resistor R5 and a diode D7 in sequence, a port 2 is grounded, an output end of the three-phase rectifier circuit is connected between the port 1 and the port 2 of the optocoupler U1 in parallel, and a port 4 and a port 5 serve as output ports.
Further, the port 6 of the optocoupler U1 is connected to the port 4 serving as the negative electrode through a resistor R6.
Further, the three-phase rectifying circuit also comprises a resistor R4 which is connected in parallel with the output end of the three-phase rectifying circuit through the bus and is used for providing a path for discharging energy.
Further, the voltage stabilizing device also comprises a voltage stabilizing diode D8 connected in parallel to two ends of the bus for stabilizing the bus voltage.
Further, the three-phase rectifying circuit comprises three-phase bridge arm branches connected with the sampling branches respectively, and the output ends of the three sampling branches are connected with neutral points of the three bridge arm branches respectively.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of an embodiment of the present utility model.
Detailed Description
Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, a three-phase voltage monitoring circuit according to an embodiment of the present utility model includes: the voltage sampling circuit, the three-phase arrangement circuit and the optocoupler isolation circuit are connected in sequence.
The input of voltage sampling circuit is connected with three-phase voltage, voltage sampling circuit includes: the three sampling branches are respectively connected with three-phase voltage and comprise a first capacitor and a first resistor which are connected in series and are used for reducing the voltage to acquire the three-phase voltage signals;
specifically, the phase a of the three-phase power supply is connected to the resistor R1 through the capacitor C1 connected in series, the phase B of the three-phase power supply is connected to the resistor R2 through the capacitor C2 connected in series, and the phase C of the three-phase power supply is connected to the resistor R3 through the capacitor C3 connected in series.
The input end of the three-phase rectifying circuit is connected with the output end of the voltage sampling circuit and is used for rectifying received three-phase electricity so as to output a direct current electric signal;
specifically, the three-phase rectifying circuit comprises three-phase bridge arm branches connected with the sampling branches respectively, and the output ends of the three sampling branches are connected with neutral points of the three bridge arm branches respectively;
the three bridge arm branches are connected in parallel to the bus, an A-phase bridge arm branch is formed by a diode D6 and a diode D5, a B-phase bridge arm branch is formed by a diode D4 and a diode D3, a C-phase bridge arm branch is formed by a diode D2 and a diode D1, a common cathode group is formed by a diode D5, a diode D3 and a cathode of the diode D1, a common anode group is formed by an anode of the diode D6, the diode D4 and the diode D2, the three bridge arm branches are connected in parallel to one side of an input end of the optical coupling isolation circuit through the common cathode group and the common anode group at two ends, and the common cathode group and the common anode group are respectively connected with a direct current power supply and the ground through the bus;
specifically, the output end of a resistor R1 connected with the A-phase power supply is connected with the anode of a diode D5 and the cathode of a diode D6 in the A-phase bridge arm branch, the output end of a resistor R2 connected with the B-phase power supply is connected with the anode of a diode D3 and the cathode of a diode D4 in the B-phase bridge arm branch, and the output end of a resistor R3 connected with the C-phase power supply is connected with the anode of a diode D1 and the cathode of a diode D2 in the C-phase bridge arm branch.
The three-phase rectifying circuit also comprises a resistor R4 which is connected in parallel with the output end of the three-phase rectifying circuit through the bus and is used for providing a passage for discharging energy, and specifically, two ends of the resistor R4 are respectively connected with the common cathode group and the common anode group of the bridge arm branch so as to be connected in parallel with two ends of the three-phase rectifying circuit.
The optocoupler isolation circuit is connected to the output end of the three-phase rectifying circuit through a bus, the output end of the optocoupler isolation circuit is connected with an external sampling circuit, and high-voltage isolation is performed through the optocoupler isolation circuit so as to control the on-off of the output end of the optocoupler isolation circuit.
The first capacitor and the first resistor in the voltage sampling circuit are connected in series, so that the collected three-phase voltage is reduced, the effect of reducing the voltage of the subsequent optocoupler isolation circuit is achieved, the three-phase rectification circuit rectifies the reduced alternating current signal into a direct current signal, the direct current signal is transmitted to the optocoupler isolation circuit, high-voltage isolation is carried out through the optocoupler isolation circuit, the output of the optocoupler isolation circuit carries out high-voltage sampling or stops high-voltage sampling according to the on-state or off-state of the optocoupler, and high-voltage isolation is achieved.
Wherein, the opto-coupler isolation circuit includes: the three-phase finishing circuit comprises an optical coupler U1, wherein a port 1 of the optical coupler U1 is connected with a direct current power supply through a resistor R5 and a diode D7 in sequence, the direct current power supply is a +12V power supply, a port 2 is grounded, and specifically, a common cathode group of the three-phase finishing circuit is connected with an anode of the diode D7;
the output end of the three-phase rectifying circuit is connected in parallel between the port 1 and the port 2 of the optical coupler U1, the port 4 and the port 5 are used as output ports, and the port 6 of the optical coupler U1 is connected with the port 4 serving as a negative electrode through a resistor R6.
The bus voltage stabilizing device further comprises a voltage stabilizing diode D8 connected in parallel with the two ends of the bus, specifically, the cathode of the voltage stabilizing diode D8 is connected to the direct current power supply +12V, and the anode of the voltage stabilizing diode D8 is grounded and used for stabilizing the bus voltage.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (6)
1. A three-phase voltage monitoring circuit, comprising:
the input of voltage sampling circuit is connected with three-phase voltage, voltage sampling circuit includes: the three sampling branches are respectively connected with three-phase voltage and comprise a first capacitor and a first resistor which are connected in series and are used for reducing the voltage to acquire the three-phase voltage signals;
the input end of the three-phase rectifying circuit is connected with the output end of the voltage sampling circuit and is used for rectifying received three-phase electricity so as to output a direct current electric signal;
the optical coupling isolation circuit is connected to the output end of the three-phase rectifying circuit through a bus, the output end of the optical coupling isolation circuit is connected with the external sampling circuit, and high-voltage isolation is carried out through the optical coupling isolation circuit so as to control the on-off of the output end of the optical coupling isolation circuit.
2. The three-phase voltage monitoring circuit of claim 1, wherein the optocoupler isolation circuit comprises: the three-phase rectifier circuit comprises an optocoupler U1, wherein a port 1 of the optocoupler U1 is connected with a direct current power supply through a resistor R5 and a diode D7 in sequence, a port 2 is grounded, an output end of the three-phase rectifier circuit is connected between the port 1 and the port 2 of the optocoupler U1 in parallel, and a port 4 and a port 5 serve as output ports.
3. The three-phase voltage monitoring circuit according to claim 2, wherein the port 6 of the optocoupler U1 is connected to the port 4 as a negative electrode through a resistor R6.
4. A three-phase voltage monitoring circuit according to claim 3, further comprising a resistor R4 connected in parallel to the output of the three-phase rectifying circuit via the bus for providing a path for discharging energy.
5. A three-phase voltage monitoring circuit according to claim 3, further comprising a zener diode D8 connected in parallel across the bus for stabilizing the bus voltage.
6. The three-phase voltage monitoring circuit according to claim 3, wherein the three-phase rectifying circuit comprises three-phase bridge arm branches respectively connected with the sampling branches, and the output ends of the three sampling branches are respectively connected with neutral points of the three bridge arm branches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320603639.3U CN219657760U (en) | 2023-03-24 | 2023-03-24 | Three-phase voltage monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320603639.3U CN219657760U (en) | 2023-03-24 | 2023-03-24 | Three-phase voltage monitoring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657760U true CN219657760U (en) | 2023-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320603639.3U Active CN219657760U (en) | 2023-03-24 | 2023-03-24 | Three-phase voltage monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219657760U (en) |
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2023
- 2023-03-24 CN CN202320603639.3U patent/CN219657760U/en active Active
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