CN207866887U - A kind of ac voltage detection circuit - Google Patents
A kind of ac voltage detection circuit Download PDFInfo
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- CN207866887U CN207866887U CN201820373105.5U CN201820373105U CN207866887U CN 207866887 U CN207866887 U CN 207866887U CN 201820373105 U CN201820373105 U CN 201820373105U CN 207866887 U CN207866887 U CN 207866887U
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Abstract
The utility model provides a kind of ac voltage detection circuit, including rectification module, division module, compare isolation module and control module, rectification module connects division module, for the sinusoidal voltage of input to be rectified into positive steamed bun wave, isolation module is compared in division module connection, for positive steamed bun wave to be compared isolation module by entering after divider resistance equal proportion reduction voltage, compare isolation module link control module, for the tested voltage and reference voltage that enter to be compared, the on or off of photo-coupler is controlled according to comparison result, and export high level when exporting low level or shutdown when the photo-coupler is connected, and low level or high level are accessed into control module, control module is used for the high-low level time interval accessed of following up, judgement obtains the height of tested alternating voltage.This circuit is simple and reliable, of low cost, is greatly improved the accuracy of detection of alternating voltage, it is rectified after positive steamed bun wave can realize that all-wave detects, detection efficiency is high.
Description
Technical Field
The utility model relates to a voltage detection technical field, concretely relates to alternating voltage detection circuitry.
Background
In an electronic circuit, various application circuits need to detect an ac voltage to determine whether the voltage is abnormal, so as to effectively protect a subsequent circuit or device. For example, in the process of charging an electric vehicle by a charger, it is necessary to continuously detect whether the input ac voltage is abnormal, that is, to continuously determine whether the input ac voltage exceeds a preset voltage range, so as to perform corresponding processing control according to the input ac voltage.
However, the inventor of the present invention found through research that, in the current input voltage detection application of the charger, the commonly used ac voltage detection circuit uses a circuit including an analog-to-digital converter and a microcontroller to realize the judgment, but the detection precision of the ac voltage detection circuit is lower and the manufacturing cost is higher.
SUMMERY OF THE UTILITY MODEL
To current quick-witted input voltage that charges detect and use, common alternating voltage detection circuitry uses the circuit including adc and microcontroller to realize judging, but this alternating voltage detection circuitry's the lower and higher technical problem of cost of detection precision, the utility model provides a novel alternating voltage detection circuitry.
In order to solve the technical problem, the utility model discloses a following technical scheme:
an alternating voltage detection circuit comprises a rectification module, a voltage division module, a comparison isolation module and a control module; wherein,
the rectifying module is connected with the voltage dividing module and is used for rectifying the input sinusoidal alternating voltage into a positive direction steamed bread wave;
the voltage dividing module is connected with the comparison and isolation module and is used for enabling the forward steamed bread waves to enter the comparison and isolation module after the voltage is reduced in an equal proportion through the voltage dividing resistor;
the comparison isolation module is connected with the control module and is used for comparing the entered measured voltage with the reference voltage, controlling the on or off of the optical coupler according to the comparison result, outputting a low level when the optical coupler is on or outputting a high level when the optical coupler is off, and accessing the high level or the low level into the control module;
the control module is used for following the time interval of the high and low levels of the access and judging the height of the detected alternating current voltage.
Further, the rectifier module includes first diode, second diode, rectifier bridge and energy storage capacitor, the positive pole of first diode is connected with alternating voltage's zero line and rectifier bridge's first input end, the positive pole of second diode is connected with alternating voltage's live wire and rectifier bridge's second input end, the negative pole of first diode and second diode is connected and is inserted to the voltage division module, rectifier bridge's first output and energy storage capacitor's one end and high-voltage end are connected, rectifier bridge's second output and energy storage capacitor's the other end and reference ground are connected.
Furthermore, the voltage division module comprises a first resistor, a second resistor and a third resistor, one end of the first resistor is connected with the rectification module, the other end of the first resistor is connected with the reference ground after passing through the second resistor and the third resistor, and a connection node between the second resistor and the third resistor is connected to the comparison isolation module.
Further, the comparison isolation module comprises a reference voltage chip, an optical coupler, a fourth resistor and a fifth resistor, wherein a first input end of the reference voltage chip is connected with the voltage division module, a second input end of the reference voltage chip is connected with a reference ground, an output end of the reference voltage chip is connected with a negative electrode of an input end of the optical coupler, a positive electrode of the input end of the optical coupler is connected with a first pull-up power supply through the fourth resistor, an emitter of the output end of the optical coupler is grounded, a collector of the output end of the optical coupler is connected with a second pull-up power supply through the fifth resistor, and a connection node between the collector of the output end of the optical coupler and the fifth resistor is connected to the control module.
Further, the control module adopts an MSP430F series single-chip microcomputer.
Compared with the prior art, the utility model provides an alternating voltage detection circuitry, adopt the rectifier module to become the sinusoidal alternating voltage rectification of input into forward steamed bread ripples, get into relatively isolation module after divider resistance step-down, measured voltage after the step-down is higher than the reference voltage that the reference voltage chip set for, the optical coupler switches on output low level, otherwise the optical coupler switches off output high level, control module is according to received high level and low level, confirm the time interval of high low level, can be in order to confirm the on-time of optical coupler in a plurality of periods, thereby judge the height that reachs being surveyed alternating voltage, in order to realize carrying out the control to back level equipment according to input alternating voltage's height. The circuit is simple and reliable, has low cost, is a switching signal after being compared by a reference voltage chip, does not depend on the current transmission ratio of a common optical coupler, and can greatly improve the detection precision of alternating voltage; the rectification module is used for rectifying the input sine alternating voltage into a positive voltage wave for detection, so that full-wave detection can be realized, and compared with the existing half-wave detection, the detection efficiency is doubled.
Drawings
Fig. 1 is a schematic diagram of the ac voltage detection circuit principle structure provided by the present invention.
In the figure, 1, a rectifying module; 2. a voltage division module; 3. a comparison isolation module; 4. and a control module.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides an ac voltage detection circuit, which includes a rectification module 1, a voltage division module 2, a comparison isolation module 3, and a control module 4; wherein,
the rectifying module 1 is connected with the voltage dividing module 2, and the rectifying module 1 is used for rectifying an input sinusoidal alternating-current voltage (such as a mains supply) into a positive-direction bread wave;
the voltage division module 2 is connected with the comparison and isolation module 3, and the voltage division module 2 is used for reducing the voltage of the forward steamed bread waves in an equal proportion through a voltage division resistor and then enabling the forward steamed bread waves to enter the comparison and isolation module 3;
the comparison and isolation module 3 is connected with the control module 4, the comparison and isolation module 3 is used for comparing the incoming measured voltage with the reference voltage, controlling the on or off of the optical coupler according to the comparison result, outputting a low level when the optical coupler is on or outputting a high level when the optical coupler is off, and accessing the high level or the low level to the control module;
the control module 4 is used for following the time interval of the high and low levels of the access and judging the level of the detected alternating current voltage.
As a specific embodiment, please refer to fig. 1, the rectifying module 1 includes a first diode D1, a second diode D2, a rectifying bridge BD1, and an energy storage capacitor C1, an anode of the first diode D1 is connected to the zero line N of the ac voltage and a first input end of the rectifying bridge BD1, an anode of the second diode D2 is connected to the live line L of the ac voltage and a second input end of the rectifying bridge BD1, cathodes of the first diode D1 and the second diode D2 are connected to the voltage dividing module 2, a first output end of the rectifying bridge BD1 is connected to one end of the energy storage capacitor C1 and the high voltage end HV, and a second output end of the rectifying bridge BD1 is connected to the other end of the energy storage capacitor C1 and the ground VGND. In one embodiment, the high-voltage terminal HV is a positive electrode of a direct-current power supply output after being rectified by the rectifier bridge BD1, VGND is a negative electrode of the direct-current power supply output after being rectified by the rectifier bridge BD1, and when LN 220VAC is input, the voltage of the high-voltage terminal HV is 220 × 1.414 — 311VDC, and the voltage of the reference ground VGND is 0.
As a specific embodiment, referring to fig. 1, the voltage dividing module 2 includes a first resistor RJ1, a second resistor RJ2 and a third resistor RJ3, one end of the first resistor RJ1 is connected to the rectifying module 1, i.e., connected to the cathodes of the first diode D1 and the second diode D2, the other end of the first resistor RJ1 is connected to ground VGND after passing through the second resistor RJ2 and the third resistor RJ3, and a connection node between the second resistor RJ2 and the third resistor RJ3 is connected to the comparison and isolation module 3, i.e., a voltage across the third resistor RJ3 is connected to the comparison and isolation module 3.
As a specific embodiment, referring to fig. 1, the comparison and isolation module 3 includes a reference voltage chip ICJ2, an optocoupler PC1, a fourth resistor RJ4 and a fifth resistor R5, a first input terminal of the reference voltage chip ICJ2 is connected to the voltage dividing module 2, i.e., the connection node between the second resistor RJ2 and the third resistor RJ3, the second input terminal of the reference voltage chip ICJ2 is connected to the reference ground VGND, the output end of the reference voltage chip ICJ2 is connected with the negative pole of the input end of an optocoupler PC1, the positive pole of the input end of an optocoupler PC1 is connected with a first pull-up power source VCC1 through a fourth resistor RJ4, the emitter of the output end of the optocoupler PC1 is grounded GND, the collector of the output end of an optocoupler PC1 is connected with a second pull-up power source VCC2 through a fifth resistor R5, and a connection node between the collector of the output terminal of the photo coupler PC1 and the fifth resistor R5 is connected to the control module 4. In one embodiment, the reference voltage chip ICJ2 is a chip model TL431, the voltage of the first pull-up power source VCC1 is 5VDC, and the voltage of the second pull-up power source VCC2 is 3.3 VDC. The working principle of the comparative isolation module in this embodiment is as follows: after the voltage dropped by the voltage dividing module 2 enters the first input terminal of the reference voltage chip ICJ2, the voltage is compared with the reference voltage set by the reference voltage chip ICJ2, for example, 2.5V, when the dropped voltage is higher than the reference voltage 2.5V, the output terminal of the reference voltage chip ICJ2 is connected to the reference ground VGND through the second input terminal, the photo coupler PC1 is turned on and outputs a low level, and otherwise, the photo coupler PC1 is turned off and outputs a high level. In the embodiment, the reference voltage chip TL431 compares the voltage with the switching signal, and thus the voltage detection accuracy can be greatly improved without depending on the current transmission ratio of a common optical coupler.
As a specific embodiment, please refer to fig. 1, the control module 4 is a single chip microcomputer MCU2, a 2 nd pin of the single chip microcomputer MCU2 is connected to a connection node between a collector of the output terminal of the optical coupler PC1 and the fifth resistor R5, and a 7 th pin of the single chip microcomputer MCU2 is used as an output control terminal; the control module 4 specifically adopts an MSP430F series single chip microcomputer, and the series single chip microcomputer has the characteristics of strong processing capability, high operation speed, ultralow power consumption and the like, so that the high level, namely the conduction time, of the optical coupler PC1 can be quickly identified and periodically calculated to obtain the value of the alternating current voltage to be measured, and the alternating current voltage can be accurately judged according to the preset voltage range. Of course, those skilled in the art can also use other existing methods to calculate the corresponding ac voltage value based on the foregoing embodiments.
Compared with the prior art, the utility model provides an alternating voltage detection circuitry, adopt the rectifier module to become the sinusoidal alternating voltage rectification of input into forward steamed bread ripples, get into relatively isolation module after divider resistance step-down, measured voltage after the step-down is higher than the reference voltage that the reference voltage chip set for, the optical coupler switches on output low level, otherwise the optical coupler switches off output high level, control module is according to received high level and low level, confirm the time interval of high low level, can be in order to confirm the on-time of optical coupler in a plurality of periods, thereby judge the height that reachs being surveyed alternating voltage, in order to realize carrying out the control to back level equipment according to input alternating voltage's height. The circuit is simple and reliable, has low cost, is a switching signal after being compared by a reference voltage chip, does not depend on the current transmission ratio of a common optical coupler, and can greatly improve the detection precision of alternating voltage; the rectification module is used for rectifying the input sine alternating voltage into a positive voltage wave for detection, so that full-wave detection can be realized, and compared with the existing half-wave detection, the detection efficiency is doubled.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (5)
1. The alternating voltage detection circuit is characterized by comprising a rectification module, a voltage division module, a comparison isolation module and a control module; wherein,
the rectifying module is connected with the voltage dividing module and is used for rectifying the input sinusoidal alternating voltage into a positive direction steamed bread wave;
the voltage dividing module is connected with the comparison and isolation module and is used for enabling the forward steamed bread waves to enter the comparison and isolation module after the voltage is reduced in an equal proportion through the voltage dividing resistor;
the comparison isolation module is connected with the control module and used for comparing the incoming measured voltage with the reference voltage, controlling the on or off of the optical coupler according to the comparison result, outputting a low level when the optical coupler is on or outputting a high level when the optical coupler is off, and connecting the low level or the high level into the control module;
the control module is used for following the time interval of the high and low levels of the access and judging the height of the detected alternating current voltage.
2. The ac voltage detection circuit according to claim 1, wherein the rectifying module includes a first diode, a second diode, a rectifying bridge, and an energy storage capacitor, an anode of the first diode is connected to a zero line of the ac voltage and a first input terminal of the rectifying bridge, an anode of the second diode is connected to a live line of the ac voltage and a second input terminal of the rectifying bridge, cathodes of the first diode and the second diode are connected to the voltage division module, a first output terminal of the rectifying bridge is connected to one end and a high voltage terminal of the energy storage capacitor, and a second output terminal of the rectifying bridge is connected to the other end of the energy storage capacitor and a reference ground.
3. The alternating current voltage detection circuit according to claim 1, wherein the voltage division module comprises a first resistor, a second resistor and a third resistor, one end of the first resistor is connected with the rectification module, the other end of the first resistor is connected with a reference ground after passing through the second resistor and the third resistor, and a connection node between the second resistor and the third resistor is connected to the comparison isolation module.
4. The alternating-current voltage detection circuit according to claim 1, wherein the comparison isolation module comprises a reference voltage chip, an optocoupler, a fourth resistor and a fifth resistor, a first input end of the reference voltage chip is connected with the voltage division module, a second input end of the reference voltage chip is connected with a reference ground, an output end of the reference voltage chip is connected with a negative electrode of the input end of the optocoupler, a positive electrode of the input end of the optocoupler is connected with the first pull-up power supply through the fourth resistor, an emitter of the output end of the optocoupler is connected with the ground, a collector of the output end of the optocoupler is connected with the second pull-up power supply through the fifth resistor, and a connection node between the collector of the output end of the optocoupler and the fifth resistor is connected to the control module.
5. The ac voltage detection circuit of claim 1, wherein the control module employs an MSP430F series single chip microcomputer.
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| CN201820373105.5U CN207866887U (en) | 2018-03-16 | 2018-03-16 | A kind of ac voltage detection circuit |
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| CN201820373105.5U CN207866887U (en) | 2018-03-16 | 2018-03-16 | A kind of ac voltage detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| WO2022037618A1 (en) * | 2020-08-20 | 2022-02-24 | 上海南麟电子股份有限公司 | Alternating-current test circuit |
| CN117554687A (en) * | 2024-01-10 | 2024-02-13 | 常州通宝光电股份有限公司 | Alternating current mains voltage sampling circuit |
-
2018
- 2018-03-16 CN CN201820373105.5U patent/CN207866887U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| WO2022037618A1 (en) * | 2020-08-20 | 2022-02-24 | 上海南麟电子股份有限公司 | Alternating-current test circuit |
| US11988723B2 (en) | 2020-08-20 | 2024-05-21 | Shanghai Natlinear Electronics Co., Ltd. | Alternating-current detection circuit |
| CN117554687A (en) * | 2024-01-10 | 2024-02-13 | 常州通宝光电股份有限公司 | Alternating current mains voltage sampling circuit |
| CN117554687B (en) * | 2024-01-10 | 2024-03-22 | 常州通宝光电股份有限公司 | Alternating current mains voltage sampling circuit |
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