CN204731307U - AC voltage detection circuit - Google Patents

AC voltage detection circuit Download PDF

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Publication number
CN204731307U
CN204731307U CN201520389219.5U CN201520389219U CN204731307U CN 204731307 U CN204731307 U CN 204731307U CN 201520389219 U CN201520389219 U CN 201520389219U CN 204731307 U CN204731307 U CN 204731307U
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China
Prior art keywords
photoelectrical coupler
voltage detection
rectifier bridge
resistance
detection circuit
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CN201520389219.5U
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Chinese (zh)
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翟定群
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TAIHENG PRECISION MEASUREMENT CONTROL (KUNSHAN) CO Ltd
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TAIHENG PRECISION MEASUREMENT CONTROL (KUNSHAN) CO Ltd
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Abstract

The utility model discloses a kind of ac voltage detection circuit, comprise rectifier bridge (BR) and photoelectrical coupler (OC), on the live wire (L) that two ac input ends of described rectifier bridge (BR) are connected to electrical network and zero line (N), the output plus terminal of described rectifier bridge (BR) connects the anode of described photoelectrical coupler (OC) by the first resistance (R1), the output negative terminal of described rectifier bridge (BR) connects the negative electrode of described photoelectrical coupler (OC), the grounded emitter (GND) of described photoelectrical coupler (OC), the collector of described photoelectrical coupler (OC) is connected with power supply (VCC) by the second resistance (R2), the collector of described photoelectrical coupler (OC) is exported by the 3rd resistance (R3) voltage detection signal (Vo).The utility model has that circuit structure is simple, cost is low, the life-span is long, security advantages of higher.

Description

Ac voltage detection circuit
Technical field
The utility model relates to a kind of testing circuit, particularly a kind of ac voltage detection circuit.
Background technology
At present; alternating voltage higher to alternating voltage especially voltage on market detects main voltage transformer (VT); the effect of voltage transformer (VT) is: high voltage in proportion relation transformation become 100V or more low-grade standard secondary voltage, for protection, metering, metering device.Meanwhile, voltage transformer (VT) is used high voltage and electrician can be isolated.Its principle be alternating voltage through voltage transformer (VT) output current signal, through I-V discharge circuit, biasing circuit, AD637 RMS-DC converter IC, finally input AD acquisition module.This kind of scheme, due to the electronic devices and components such as voltage transformer (VT), discharge circuit, AD converter, AD acquisition module need be adopted to coordinate peripheral circuit to realize the detection of alternating voltage, its circuit structure is complicated, and cost is high, is applicable to being applied in highly sophisticated device.Be difficult to realize in general low cost application.In addition, a kind of multiple point voltage values utilized in AD acquisition module collection one-period are described in prior art, data processing is carried out again by software, this scheme can increase the very large computational burden of the microprocessor such as single-chip microcomputer or DSP, and it is not high enough to gather density, error can be very large, thus have impact on the detected value of alternating voltage.
Utility model content
Technical problem to be solved in the utility model is, provides the ac voltage detection circuit that a kind of circuit structure is simple, cost is low, the life-span is long, security is high.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of ac voltage detection circuit, comprise rectifier bridge and photoelectrical coupler, on the live wire that two ac input ends of described rectifier bridge are connected to electrical network and zero line, the output plus terminal of described rectifier bridge connects the anode of described photoelectrical coupler by the first resistance, the output negative terminal of described rectifier bridge connects the negative electrode of described photoelectrical coupler, the grounded emitter of described photoelectrical coupler, the collector of described photoelectrical coupler is connected with power supply by the second resistance, the collector of described photoelectrical coupler is exported by the 3rd resistance voltage detection signal.
Further, the ac voltage detection circuit that the utility model provides, is connected with input filter capacitor between the anode of described photoelectrical coupler and negative electrode.
Further, the ac voltage detection circuit that the utility model provides, described input filter capacitor comprises the first electric capacity between anode and negative electrode and the second electric capacity that are connected in parallel on described photoelectrical coupler.
Further, the ac voltage detection circuit that the utility model provides, is connected with output filter capacitor between described voltage detection signal and ground.
Further, the ac voltage detection circuit that the utility model provides, described output filter capacitor is the 3rd electric capacity.
Further, the ac voltage detection circuit that the utility model provides, between described rectifier bridge and the first resistance, forward is connected with the first diode.
Further, the ac voltage detection circuit that the utility model provides, described rectifier bridge is full-wave rectification bridge.
Further, the ac voltage detection circuit that the utility model provides, described first resistance is current-limiting resistance.
The rectifier bridge that the utility model adopts photoelectrical coupler and is connected on the live wire of electrical network and zero line, as everyone knows, photoelectrical coupler comprises illuminator and light-receiving device, and illuminator is generally light emitting diode, and light-receiving device is generally the transistor of light signal as control signal.After the first resistance current limliting, photoelectrical coupler is supplied to after the alternating voltage of electrical network is converted to DC voltage by rectifier bridge, DC voltage then through the illuminator two ends of photoelectrical coupler will by clamper, then the changing value of voltage is converted into current value, affect the brightness of the illuminator of photoelectrical coupler, the intensity of the light signal that the light-receiving device of photoelectrical coupler is launched according to illuminator, the voltage detection signal of different magnitude of voltage is exported by the 3rd resistance, Strength Changes due to the light signal of photoelectrical coupler affects the on-state rate of light-receiving device, namely the intensity of light is larger, the on-state rate of light-receiving device is higher, the magnitude of voltage that photoelectrical coupler is exported by the 3rd resistance is higher, thus the detection realized alternating voltage.Compared with prior art, the utility model, owing to have employed a rectifier bridge and a photoelectrical coupler and three resistance, therefore, has circuit structure simple, the advantage that cost is low.In addition, due to photoelectrical coupler is core component of the present utility model, reaches the optical attenuation that all to occur 90% after being about 6000 hours its serviceable life, and therefore, the utility model has life-span long advantage.And photoelectrical coupler of the present utility model has buffer action, therefore, there is higher security.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment one;
Fig. 2 is the circuit theory diagrams of the utility model embodiment two.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail:
Embodiment one
Please refer to Fig. 1, the ac voltage detection circuit that the present embodiment one provides, comprise rectifier bridge BR and photoelectrical coupler OC, described rectifier bridge BR is full-wave rectification bridge; On the live wire L that two ac input ends of described rectifier bridge BR are connected to electrical network and zero line N, the output plus terminal of described rectifier bridge BR connects the anode of described photoelectrical coupler OC by the first resistance R1, the output negative terminal of described rectifier bridge BR connects the negative electrode of described photoelectrical coupler OC, wherein the first resistance R1 is current-limiting resistance, wherein, being connected with input filter capacitor between the anode of described photoelectrical coupler OC and negative electrode, such as, can be connected in parallel on the first electric capacity C1 and the second electric capacity C2 between the anode of described photoelectrical coupler OC and negative electrode; The grounded emitter GND of described photoelectrical coupler OC, the collector of described photoelectrical coupler OC is connected with power supply VCC by the second resistance R2, the collector of described photoelectrical coupler OC is exported by the 3rd resistance R3 voltage detection signal Vo, output filter capacitor is connected with between described voltage detection signal Vo and ground GND, such as output filter capacitor can be a 3rd electric capacity C3, also can be multiple shunt capacitance.Wherein, photoelectrical coupler comprises illuminator and light-receiving device, has the effect of opto-electronic conversion and isolation.
The illuminator of the photoelectrical coupler OC of the present embodiment one is generally light emitting diode, and light-receiving device is generally the transistor of light signal as control signal.Its principle of work is as follows: the alternating voltage of electrical network is converted to after DC voltage through the first resistance R1 current limliting by rectifier bridge BR, photoelectrical coupler OC is supplied to again after input filter capacitor i.e. the first electric capacity C1 and the second electric capacity C2 filtering, DC voltage then through the illuminator two ends of photoelectrical coupler OC will by clamper, then the changing value of voltage is converted into current value, affect the brightness of the illuminator of photoelectrical coupler OC, namely the luminosity of light emitting diode is affected, the intensity of the light signal that the light-receiving device of photoelectrical coupler OC is launched according to illuminator, the voltage detection signal Vo of different magnitude of voltage is exported by the 3rd resistance R3, Strength Changes due to the light signal of photoelectrical coupler OC affects the on-state rate of light-receiving device, namely the intensity of light is larger, the on-state rate of light-receiving device is higher, the magnitude of voltage that photoelectrical coupler is exported by the 3rd resistance R3 is higher, thus the detection realized alternating voltage.
Embodiment two
In order to overcome in embodiment one when one of them diode in rectifier bridge BR is breakdown or damage time, the voltage signal of the negative half period of alternating voltage directly provides photoelectrical coupler OC, occurs that situation about flowing backwards occurs when preventing the voltage signal being supplied to photoelectrical coupler OC two ends from transforming current signal.The present embodiment two provides a kind of alternating current testing circuit, please refer to Fig. 2, the present embodiment two be the present embodiment one basis on improve, its difference is, between described rectifier bridge BR and the first resistance R1, forward is connected with the first diode D1.
The present embodiment two adds the first diode D1 in rectifier bridge BR rear end, then the first diode D1 is in cut-off state when alternating voltage negative half period, thus provides voltage signal to photoelectrical coupler OC, thus overcomes the generation of the situation of refluence.Alternating voltage is when positive half cycle, and the first diode D1 is in conducting state, provides voltage signal to photoelectrical coupler OC.Thus continue by the 3rd resistance R3 the ac voltage detecting AC network, voltage sense signal Vo.
The utility model overcomes the technology prejudice of this area, does not adopt voltage transformer (VT) to carry out sampled measurements, and have employed the opto-electronic conversion feature of photoelectrical coupler and buffer action is provided with ac voltage detection circuit of the present utility model.It should be noted that: in above-mentioned embodiment of the present utility model, the voltage detection signal Vo that photoelectrical coupler OC is exported by the 3rd resistance R3 is d. c. voltage signal, is the scaling signal of alternating voltage, is not the actual ac voltage signal of AC network.
By above-described embodiment one and embodiment two known, the utility model, owing to have employed an an a rectifier bridge BR and photoelectrical coupler OC and three resistance R1 to R3, therefore, has circuit structure simple, the advantage that cost is low.In addition, due to photoelectrical coupler OC is core component of the present utility model, reaches the optical attenuation that all to occur 90% after being about 6000 hours its serviceable life, and therefore, the utility model has life-span long advantage.In addition, photoelectrical coupler OC of the present utility model has buffer action, and staff, when carrying out voltage detecting, avoids the risk of high-voltage great-current, therefore, has higher security.
The utility model is not limited to above-mentioned embodiment, and all various changes done in the spirit and scope of claim of the present utility model, all within protection domain of the present utility model.

Claims (8)

1. an ac voltage detection circuit, it is characterized in that, comprise rectifier bridge (BR) and photoelectrical coupler (OC), on the live wire (L) that two ac input ends of described rectifier bridge (BR) are connected to electrical network and zero line (N), the output plus terminal of described rectifier bridge (BR) connects the anode of described photoelectrical coupler (OC) by the first resistance (R1), the output negative terminal of described rectifier bridge (BR) connects the negative electrode of described photoelectrical coupler (OC), the grounded emitter (GND) of described photoelectrical coupler (OC), the collector of described photoelectrical coupler (OC) is connected with power supply (VCC) by the second resistance (R2), the collector of described photoelectrical coupler (OC) is exported by the 3rd resistance (R3) voltage detection signal (Vo).
2. ac voltage detection circuit according to claim 1, is characterized in that, is connected with input filter capacitor between the anode of described photoelectrical coupler (OC) and negative electrode.
3. ac voltage detection circuit according to claim 2, it is characterized in that, described input filter capacitor comprises the first electric capacity (C1) between anode and negative electrode and the second electric capacity (C2) that are connected in parallel on described photoelectrical coupler (OC).
4. ac voltage detection circuit according to claim 1, is characterized in that, is connected with output filter capacitor between described voltage detection signal (Vo) and ground (GND).
5. ac voltage detection circuit according to claim 4, is characterized in that, described output filter capacitor is the 3rd electric capacity (C3).
6. ac voltage detection circuit according to claim 1, is characterized in that, between described rectifier bridge (BR) and the first resistance (R1), forward is connected with the first diode (D1).
7. ac voltage detection circuit according to claim 1, is characterized in that, described rectifier bridge (BR) is full-wave rectification bridge.
8. ac voltage detection circuit according to claim 1, is characterized in that, described first resistance (R1) is current-limiting resistance.
CN201520389219.5U 2015-06-08 2015-06-08 AC voltage detection circuit Active CN204731307U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520389219.5U CN204731307U (en) 2015-06-08 2015-06-08 AC voltage detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520389219.5U CN204731307U (en) 2015-06-08 2015-06-08 AC voltage detection circuit

Publications (1)

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CN204731307U true CN204731307U (en) 2015-10-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105425022A (en) * 2015-12-18 2016-03-23 顺德职业技术学院 Simple detection circuit for mains voltage
CN107782957A (en) * 2016-08-31 2018-03-09 北京智乐精仪科技有限公司 Differential voltage detection method and battery voltage detector in the presence of common-mode voltage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105425022A (en) * 2015-12-18 2016-03-23 顺德职业技术学院 Simple detection circuit for mains voltage
CN107782957A (en) * 2016-08-31 2018-03-09 北京智乐精仪科技有限公司 Differential voltage detection method and battery voltage detector in the presence of common-mode voltage

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