CN202886443U - Voltage sampling circuit - Google Patents

Voltage sampling circuit Download PDF

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Publication number
CN202886443U
CN202886443U CN 201220160192 CN201220160192U CN202886443U CN 202886443 U CN202886443 U CN 202886443U CN 201220160192 CN201220160192 CN 201220160192 CN 201220160192 U CN201220160192 U CN 201220160192U CN 202886443 U CN202886443 U CN 202886443U
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CN
China
Prior art keywords
resistance
circuit
voltage
electric capacity
voltage comparator
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Withdrawn - After Issue
Application number
CN 201220160192
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Chinese (zh)
Inventor
梁树清
周杰
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Dongguan Jingcheng Electric Energy Equipment Co Ltd
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Dongguan Jingcheng Electric Energy Equipment Co Ltd
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Priority to CN 201220160192 priority Critical patent/CN202886443U/en
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Abstract

A voltage sampling circuit comprises a rectification circuit, a voltage comparison circuit, an optoelectronic coupler, a level conversion circuit and a smoothed filter circuit which are sequentially connected with one another. The non-inverting input end of the voltage comparison circuit is connected with the anode of the rectification circuit output end through a resistor. The anode pin of the signal input end of the optoelectronic coupler is connected with the signal output end of the voltage comparison circuit. The collector pin of the optoelectronic coupler output end is connected with the signal input end of the level conversion circuit. The signal input end of the smoothed filter circuit is connected with the signal output end of the level conversion circuit. By adopting the optoelectronic coupler, the voltage sampling circuit provided by the utility model achieves sampling in an isolation way, makes control signals and sampling signals isolated and effectively prevents influence of external voltage networks on the control signals. The voltage sampling circuit has the advantages of high control precision and insignificant sampling errors, etc.

Description

A kind of voltage sampling circuit
Technical field
The utility model relates to a kind of sample circuit, particularly a kind of voltage sampling circuit.
Background technology
In the circuit board of household electrical appliance; cause infringement to electrical equipment than great fluctuation process for what prevent line voltage; a voltage sampling circuit can be set usually; and the signal that voltage sampling circuit obtains is delivered to single-chip microcomputer process; when detecting line voltage greater than some numerical value or less than a certain numerical value; the control circuit that single-chip microcomputer is relevant just can quit work by control apparatus, in order to avoid it is caused damage.Delivering to single-chip microcomputer such as the handle of the voltage sampling circuit in the electromagnetic oven signal that sampling obtains to line voltage processes, when electromagnetic oven is worked, single-chip microcomputer detects the variation of voltage sampling signal constantly, when line voltage greater than 260 volts or during less than 160 volts, single-chip microcomputer can be exported relevant protection instruction, makes the electromagnetic oven stopped heating; During single-chip microcomputer work, also can automatically adjust pwm signal according to the variation of voltage signal, make electromagnetic oven do firm power and process.
In the existing voltage sampling circuit, usually adopt the voltage partial pressure type to sample, the variable of required sampling is carried out Direct Sampling, Single-chip Controlling signal and voltage sampling signal are not effectively isolated, thereby there is the larger problem of sampling error in the precision of impact control.
The utility model content
For overcoming the defects of prior art, the utility model provides a kind of voltage sampling circuit that control signal and voltage sampling signal effectively can be isolated.
The utility model is achieved through the following technical solutions: a kind of voltage sampling circuit comprises successively interconnective rectification circuit, voltage comparator circuit, photoelectrical coupler, level shifting circuit and smoothed filter circuit; Described rectification circuit is bridge rectifier circuit, the in-phase input end of described voltage comparator circuit is connected with the positive pole of rectification circuit output end by resistance, the anode pin of the signal input part of described photoelectrical coupler is connected with the signal output part of voltage comparator circuit, the collector pin of photoelectric coupler output end is connected with the signal input part of level shifting circuit, and the signal input part of described smoothed filter circuit is connected with the signal output part of level shifting circuit.
Described voltage comparator circuit comprises voltage comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity, the second electric capacity; One end of described the first resistance, one end of the second resistance is connected with the in-phase input end of voltage comparator, one end of the 3rd resistance, one end of the 4th resistance and an end of the first electric capacity are connected with the inverting input of voltage comparator, the other end of the 3rd resistance, one end of the power input of voltage comparator and the second electric capacity is connected with the first voltage source, the other end of the second resistance, the other end of the 4th resistance, the other end of the earth terminal of voltage comparator and the first electric capacity is connected with the negative pole of rectification circuit output end, and the other end of the first resistance is connected with the positive pole of rectification circuit output end.
The anode pin of described photoelectrical coupler signal input part is connected with an end of the signal output part of voltage comparator and the 5th resistance, the negative electrode utmost point pin of photoelectrical coupler is connected with the earth terminal of voltage comparator, and the other end of the 5th resistance is connected with the first voltage source.
Described level shifting circuit comprises triode, the 6th resistance and the 7th resistance; The base stage of described triode is connected with the collector pin of photoelectric coupler output end, the collector of triode, base stage are connected with the second voltage source by the 7th resistance, the 6th resistance respectively, the emitter pin of the emitter of triode and photoelectric coupler output end is connected in ground, i.e. the negative pole in second voltage source.
Described smoothed filter circuit comprises the 8th resistance, the 9th resistance, the tenth resistance and the 3rd electric capacity, the 4th electric capacity; One end of described the 8th resistance is connected with the collector of triode as the signal input part of smoothed filter circuit, the other end is connected with an end of the 3rd electric capacity and an end of the 9th resistance, the other end of the 9th resistance is connected with an end of the tenth resistance, the other end of the tenth resistance, the 3rd electric capacity with the emitter of triode be connected, described the 4th electric capacity and the tenth resistance are connected in parallel; The signal output part of described smoothed filter circuit is connected in parallel to stabilivolt.
The utility model compared with the prior art, the utility model is by adopting photoelectrical coupler to carry out the isolation sampling, control signal and sampled signal are effectively isolated, effectively avoided the impact of external voltage electrical network on control signal, have the advantages such as control accuracy is high, sampling error is little.
Description of drawings
Fig. 1 is the circuit diagram of the utility model embodiment.
Embodiment
Understanding for the ease of those skilled in the art is described in further detail the utility model below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of voltage sampling circuit, described voltage sampling circuit comprise successively interconnective rectification circuit, voltage comparator circuit, photoelectrical coupler U1, level shifting circuit and smoothed filter circuit.
Described rectification circuit consists of bridge rectifier circuit by four diode D1, D2, D3, D4.
Described voltage comparator circuit comprises voltage comparator U2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first capacitor C 1, the second capacitor C 1; One end of described the first resistance R 1, one end of the second resistance R 2 is connected with the in-phase input end of voltage comparator U2, one end of the 3rd resistance R 3, one end of one end of the 4th resistance R 4 and the first capacitor C 1 is connected with the inverting input of voltage comparator U2, the other end of the 3rd resistance R 3, one end of the power input of voltage comparator U2 and the second capacitor C 2 is connected with the first voltage source V DD1, the other end of the second resistance R 2, the other end of the 4th resistance R 4, the other end of the earth terminal of voltage comparator U2 and the first capacitor C 1 is connected with the negative pole of rectification circuit output end, and the other end of the first resistance R 1 is connected with the positive pole of rectification circuit output end.
The anode pin of described photoelectrical coupler U1 signal input part is connected with an end of the signal output part of voltage comparator U2 and the 5th resistance R 5, the negative electrode utmost point pin of photoelectrical coupler U1 is connected with the earth terminal of voltage comparator U2, and the other end of the 5th resistance R 5 is connected with the first voltage source V DD1.
Described level shifting circuit comprises triode Q1, the 6th resistance R 6 and the 7th resistance R 7; The base stage of described triode Q1 is connected with the collector pin of photoelectrical coupler U1 output terminal, the collector of triode Q1, base stage are connected with second voltage source VDD2 by the 7th resistance R 7, the 6th resistance R 6 respectively, the emitter pin of the emitter of triode Q1 and photoelectrical coupler U1 output terminal is connected in ground, i.e. the negative pole of second voltage source VDD2.
Described smoothed filter circuit comprises the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10 and the 3rd capacitor C 3, the 4th capacitor C 4, one end of described the 8th resistance R 8 is connected with the collector of triode Q1 as the signal input part of smoothed filter circuit, the other end is connected with an end of the 3rd capacitor C 3 and an end of the 9th resistance R 9, the other end of the 9th resistance R 9 is connected with an end of the tenth resistance R 10, the other end of the tenth resistance R 10, the 3rd capacitor C 3 with the emitter of triode Q1 be connected, described the 4th capacitor C 4 and the tenth resistance R 10 are connected in parallel; The signal output part of described smoothed filter circuit is connected in parallel to stabilivolt.
The utility model is applied in the circuit board of household electrical appliance; the voltage signal Vo of the signal output part of smoothed filter circuit is connected with the single-chip microcomputer signal input part; making voltage sampling signal behind smothing filtering deliver to single-chip microcomputer processes; single-chip microcomputer just can be exported corresponding instruction according to resulting sampled signal, effectively protects household electrical appliance.In order to protect single-chip microcomputer, at the output terminal of the smoothed filter circuit stabilivolt ZD1 that is connected in parallel.
Principle of work of the present utility model is: the all-wave voltage signal that obtains pulsing after diode D1, the D2 in line voltage (such as 220V/50Hz) the process bridge rectifier circuit, D3, the D4 rectification, the first resistance R 1, the second resistance R 2 are carried out dividing potential drop to it, the in-phase input end pin 3 of voltage comparator U2 is connected to the node between the first resistance R 1, the second resistance R 2, and the voltage on the second resistance R 2 is as sampled voltage; The inverting input pin 2 of voltage comparator U2 is connected to the node between the 3rd resistance R 3, the 4th resistance R 4, and the voltage on the 4th resistance R 4 is as reference voltage.The square-wave signal of voltage comparator U2 signal output part pin 1 output drives photoelectrical coupler U1 and carries out work, behind the signal process level shifting circuit and smoothed filter circuit the disposal of gentle filter of photoelectrical coupler U1 output terminal, the direct current signal that obtains is input to single-chip microcomputer and processes.When line voltage changes; the output signal of voltage comparator U2 signal output part pin 1 also changes; correspondingly; the direct current signal that obtains after level conversion and level and smooth the disposal of gentle filter also changes thereupon; single-chip microcomputer just can be exported corresponding instruction according to resulting sampled signal, effectively protects household electrical appliance.
Above-described embodiment is better implementation of the present utility model, is not to be to restriction of the present utility model, and under the prerequisite that does not break away from the present utility model design, any apparent replacement is all within protection domain of the present utility model.

Claims (6)

1. a voltage sampling circuit is characterized in that: comprise successively interconnective rectification circuit, voltage comparator circuit, photoelectrical coupler (U1), level shifting circuit and smoothed filter circuit; Described rectification circuit is bridge rectifier circuit, the in-phase input end of described voltage comparator circuit is connected with the positive pole of rectification circuit output end by resistance, the anode pin of the signal input part of described photoelectrical coupler (U1) is connected with the signal output part of voltage comparator circuit, the collector pin of photoelectrical coupler (U1) output terminal is connected with the signal input part of level shifting circuit, and the signal input part of described smoothed filter circuit is connected with the signal output part of level shifting circuit.
2. voltage sampling circuit according to claim 1, it is characterized in that: described voltage comparator circuit comprises voltage comparator (U2), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the first electric capacity (C1), the second electric capacity (C2); One end of described the first resistance (R1), one end of the second resistance (R2) is connected with the in-phase input end of voltage comparator (U2), one end of the 3rd resistance (R3), one end of one end of the 4th resistance (R4) and the first electric capacity (C1) is connected with the inverting input of voltage comparator (U2), the other end of the 3rd resistance (R3), one end of the power input of voltage comparator (U2) and the second electric capacity (C2) is connected with the first voltage source (VDD1), the other end of the second resistance (R2), the other end of the 4th resistance (R4), the other end of the earth terminal of voltage comparator (U2) and the first electric capacity (C1) is connected with the negative pole of rectification circuit output end, and the other end of the first resistance (R1) is connected with the positive pole of rectification circuit output end.
3. voltage sampling circuit according to claim 2, it is characterized in that: the anode pin of described photoelectrical coupler (U1) signal input part is connected with an end of the signal output part of voltage comparator (U2) and the 5th resistance (R5), the negative electrode utmost point pin of photoelectrical coupler (U1) is connected with the earth terminal of voltage comparator (U2), and the other end of the 5th resistance (R5) is connected with the first voltage source (VDD1).
4. voltage sampling circuit according to claim 3, it is characterized in that: described level shifting circuit comprises triode (Q1), the 6th resistance (R6) and the 7th resistance (R7); The base stage of described triode (Q1) is connected with the collector pin of photoelectrical coupler (U1) output terminal, the collector of triode (Q1), base stage are connected with second voltage source (VDD2) by the 7th resistance (R7), the 6th resistance (R6) respectively, the emitter pin of the emitter of triode (Q1) and photoelectrical coupler (U1) output terminal is connected in ground, i.e. the negative pole of second voltage source (VDD2).
5. voltage sampling circuit according to claim 4 is characterized in that: described smoothed filter circuit comprises the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10) and the 3rd electric capacity (C3), the 4th electric capacity (C4); One end of described the 8th resistance (R8) is connected with the collector of triode (Q1) as the signal input part of smoothed filter circuit, the other end is connected with an end of the 3rd electric capacity (C3) and an end of the 9th resistance (R9), the other end of the 9th resistance (R9) is connected with an end of the tenth resistance (R10), the other end of the tenth resistance (R10), the 3rd electric capacity (C3) with the emitter of triode (Q1) be connected, described the 4th electric capacity (C4) is connected in parallel with the tenth resistance (R10).
6. each described voltage sampling circuit according to claim 1-5, it is characterized in that: the signal output part of described smoothed filter circuit is connected in parallel to stabilivolt.
CN 201220160192 2012-04-17 2012-04-17 Voltage sampling circuit Withdrawn - After Issue CN202886443U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220160192 CN202886443U (en) 2012-04-17 2012-04-17 Voltage sampling circuit

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Application Number Priority Date Filing Date Title
CN 201220160192 CN202886443U (en) 2012-04-17 2012-04-17 Voltage sampling circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102628889A (en) * 2012-04-17 2012-08-08 东莞市精诚电能设备有限公司 Voltage sampling circuit
CN110646659A (en) * 2019-09-26 2020-01-03 浙江榆阳电子有限公司 Sampling precision and hysteresis control lifting circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102628889A (en) * 2012-04-17 2012-08-08 东莞市精诚电能设备有限公司 Voltage sampling circuit
CN102628889B (en) * 2012-04-17 2014-07-23 东莞市精诚电能设备有限公司 Voltage sampling circuit
CN110646659A (en) * 2019-09-26 2020-01-03 浙江榆阳电子有限公司 Sampling precision and hysteresis control lifting circuit
CN110646659B (en) * 2019-09-26 2021-07-30 浙江榆阳电子有限公司 Sampling precision and hysteresis control lifting circuit

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Granted publication date: 20130417

Effective date of abandoning: 20140723