CN102662095A - Three-phase voltage sampling circuit - Google Patents
Three-phase voltage sampling circuit Download PDFInfo
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- CN102662095A CN102662095A CN2012101374629A CN201210137462A CN102662095A CN 102662095 A CN102662095 A CN 102662095A CN 2012101374629 A CN2012101374629 A CN 2012101374629A CN 201210137462 A CN201210137462 A CN 201210137462A CN 102662095 A CN102662095 A CN 102662095A
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Abstract
The invention discloses a three-phase voltage sampling circuit, which comprises a signal detection circuit connected to a three-phase power supply system, wherein the output end of the signal detection circuit is connected with a signal amplification circuit; the output end of the signal amplification circuit is connected with a singlechip for controlling a switch; and the signal detection circuit mainly comprises sampling resistors R4, R10 and R16. According to the three-phase voltage sampling circuit, a three-phase voltage protection function is added newly; the resistors are used for detecting signals, so that the anti-interference capacity and the reliability are improved, and simultaneously the cost is reduced as far as possible; different connection methods, namely a star-shaped connection method and a triangular connection method, are used for detecting phase voltage and line voltage according to requirements; sampled signals are processed by an operational amplifier and sent to the singlechip for calculation; if the signals are normal, the signals are processed continuously by the singlechip; and if the signals are abnormal, the singlechip sends an instruction to a protection execution mechanism, so as to provide protection for load equipment.
Description
Technical field
The present invention relates to a kind of voltage sampling circuit, relate in particular to a kind of three-phase voltage sample circuit that is used to control protection switch.
Background technology
At present; It all is that electric current through load circuit changes and realizes that traditional control protection switch detects for the fluctuation (comprising phase shortage) of supply voltage, adopts single-phase voltage or current sample, protects not comprehensive; Poor anti jamming capability; There are bigger uncertainty and temporal hysteresis quality, possibly therefore cause the misoperation of control protection switch or protection to lose efficacy, cause load equipment to damage.
Summary of the invention
The object of the present invention is to provide a kind of three-phase voltage sample circuit, it has protection comprehensively, and cost is low, antijamming capability is strong and high reliability features, and the control protection switch detects the problem that exists in the prior art to supply voltage to solve.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of three-phase voltage sample circuit; It output terminal that comprises the signal deteching circuit that inserts three-phase power supply system, said signal deteching circuit connects signal amplification circuit; The output terminal of said signal amplification circuit is connected with the single-chip microcomputer that is used for CS; Wherein, Said signal deteching circuit comprises sampling resistor R4, R10, R16; The two ends of said sampling resistor R4 series limiting resistor R3, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit, and the two ends of said sampling resistor R10 series limiting resistor R9, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit, and the two ends of said sampling resistor R16 series limiting resistor R15, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit.
Especially; Said signal amplification circuit comprises operational amplifier U1, U2, U3; The in-phase input end resistance in series R5 of said operational amplifier U1 is connected with the end of sampling resistor R4; Inverting input resistance in series R2 is connected with the other end of sampling resistor R4, resistance in series R1 between the inverting input of said operational amplifier U1 and the output terminal, and the in-phase input end resistance in series R6 of said operational amplifier U1 inserts reference voltage; And the positive supply pin of said operational amplifier U1 is through filtering circuit connecting system power supply; The in-phase input end resistance in series R11 of said operational amplifier U2 is connected with the end of sampling resistor R10, and inverting input resistance in series R8 is connected with the other end of sampling resistor R10, resistance in series R7 between the inverting input of said operational amplifier U2 and the output terminal; The in-phase input end resistance in series R12 of said operational amplifier U2 inserts reference voltage; The in-phase input end resistance in series R17 of said operational amplifier U3 is connected with the end of sampling resistor R16, and inverting input resistance in series R14 is connected with the other end of sampling resistor R16, resistance in series R13 between the inverting input of said operational amplifier U3 and the output terminal; The in-phase input end resistance in series R20 of said operational amplifier U3 inserts reference voltage, and the output terminal of above-mentioned operational amplifier U1, U2, U3 connects the single-chip microcomputer that is used for CS.
Especially, said filtering circuit comprises capacitor C 1, the C2 of two parallel connections, the anodal connected system power supply of said capacitor C 2.
Beneficial effect of the present invention does; The compared with prior art said three-phase voltage sample circuit that is used to control protection switch has increased the three-phase voltage defencive function newly, adopts resistance to carry out input, when improving antijamming capability and reliability; Reduced cost as much as possible; Can be as required through different methods of attachment: star connection and delta connection, can realize the detection of phase voltage and line voltage, the signal that samples is delivered to the single-chip microcomputer computing after handling through operational amplifier.If signal is normal, then continue processing signals by single-chip microcomputer; If abnormal signal then sends instruction by single-chip microcomputer to protection topworks, for load equipment provides protection.
Description of drawings
Fig. 1 is the physical circuit figure of the three-phase voltage sample circuit that provides of the specific embodiment of the invention 1.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
See also shown in Figure 1ly, Fig. 1 is the physical circuit figure of the three-phase voltage sample circuit that provides of the specific embodiment of the invention 1.
In the present embodiment; A kind of three-phase voltage sample circuit; It output terminal that comprises the signal deteching circuit that inserts three-phase power supply system, said signal deteching circuit connects signal amplification circuit; The output terminal of said signal amplification circuit is connected with the single-chip microcomputer that is used for CS; Said signal deteching circuit comprises sampling resistor R4, R10, R16; The two ends of said sampling resistor R4 series limiting resistor R3, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit, and the two ends of said sampling resistor R10 series limiting resistor R9, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit, and the two ends of said sampling resistor R16 series limiting resistor R15, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit.
Said signal amplification circuit comprises operational amplifier U1, U2, U3; The in-phase input end resistance in series R5 of said operational amplifier U1 is connected with the end of sampling resistor R4; Inverting input resistance in series R2 is connected with the other end of sampling resistor R4; Resistance in series R1 between the inverting input of said operational amplifier U1 and the output terminal; The in-phase input end resistance in series R6 of said operational amplifier U1 inserts reference voltage; And the positive supply pin of said operational amplifier U1 passes through the capacitor C 1 of two parallel connections, the filtering circuit connecting system power supply that C2 forms, the anodal connected system power supply of said capacitor C 2, and the in-phase input end resistance in series R11 of said operational amplifier U2 is connected with the end of sampling resistor R10; Inverting input resistance in series R8 is connected with the other end of sampling resistor R10; Resistance in series R7 between the inverting input of said operational amplifier U2 and the output terminal, the in-phase input end resistance in series R12 of said operational amplifier U2 inserts reference voltage, and the in-phase input end resistance in series R17 of said operational amplifier U3 is connected with the end of sampling resistor R16; Inverting input resistance in series R14 is connected with the other end of sampling resistor R16; Resistance in series R13 between the inverting input of said operational amplifier U3 and the output terminal, the in-phase input end resistance in series R20 of said operational amplifier U3 inserts reference voltage, and the output terminal of above-mentioned operational amplifier U1, U2, U3 connects the single-chip microcomputer that is used for CS.
The above-mentioned three-phase voltage sample circuit that is used to control protection switch as required can be through different primary side methods of attachment: star connection or delta connection; It in the present embodiment star connection; Can realize the detection of phase voltage and line voltage, the signal that samples is delivered to the single-chip microcomputer computing after handling through operational amplifier.If signal is normal, then continue processing signals by single-chip microcomputer; If abnormal signal then sends instruction by single-chip microcomputer to protection topworks, for load equipment provides protection.
Above embodiment has just set forth ultimate principle of the present invention and characteristic; The present invention is not limited by above-mentioned example; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various variations and change, and these variations and change all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (3)
1. three-phase voltage sample circuit; It output terminal that comprises the signal deteching circuit that inserts three-phase power supply system, said signal deteching circuit connects signal amplification circuit; The output terminal of said signal amplification circuit is connected with the single-chip microcomputer that is used for CS; It is characterized in that; Said signal deteching circuit comprises sampling resistor R4, R10, R16; The two ends of said sampling resistor R4 series limiting resistor R3, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit, and the two ends of said sampling resistor R10 series limiting resistor R9, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit, and the two ends of said sampling resistor R16 series limiting resistor R15, R18, R19 are respectively incorporated three-phase power supply system into and are connected with the input end of signal amplification circuit.
2. three-phase voltage sample circuit according to claim 1; It is characterized in that; Said signal amplification circuit comprises operational amplifier U1, U2, U3; The in-phase input end resistance in series R5 of said operational amplifier U1 is connected with the end of sampling resistor R4; Inverting input resistance in series R2 is connected with the other end of sampling resistor R4, resistance in series R1 between the inverting input of said operational amplifier U1 and the output terminal, and the in-phase input end resistance in series R6 of said operational amplifier U1 inserts reference voltage; And the positive supply pin of said operational amplifier U1 is through filtering circuit connecting system power supply; The in-phase input end resistance in series R11 of said operational amplifier U2 is connected with the end of sampling resistor R10, and inverting input resistance in series R8 is connected with the other end of sampling resistor R10, resistance in series R7 between the inverting input of said operational amplifier U2 and the output terminal; The in-phase input end resistance in series R12 of said operational amplifier U2 inserts reference voltage; The in-phase input end resistance in series R17 of said operational amplifier U3 is connected with the end of sampling resistor R16, and inverting input resistance in series R14 is connected with the other end of sampling resistor R16, resistance in series R13 between the inverting input of said operational amplifier U3 and the output terminal; The in-phase input end resistance in series R20 of said operational amplifier U3 inserts reference voltage, and the output terminal of above-mentioned operational amplifier U1, U2, U3 connects the single-chip microcomputer that is used for CS.
3. three-phase voltage sample circuit according to claim 2 is characterized in that, said filtering circuit comprises capacitor C 1, the C2 of two parallel connections, the anodal connected system power supply of said capacitor C 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101374629A CN102662095A (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101374629A CN102662095A (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit |
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| CN102662095A true CN102662095A (en) | 2012-09-12 |
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| CN2012101374629A Pending CN102662095A (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048521A (en) * | 2012-12-31 | 2013-04-17 | 浙江雷顿电气科技有限公司 | Voltage detection device of automatic change-over switch |
| CN103091542A (en) * | 2012-12-31 | 2013-05-08 | 浙江雷顿电气科技有限公司 | Voltage detection circuit capable of automatically transferring switch |
| CN105606989A (en) * | 2015-11-05 | 2016-05-25 | 浙江海得新能源有限公司 | Circuit test method, device and system |
| CN106154925A (en) * | 2016-08-09 | 2016-11-23 | 深圳市新国都技术股份有限公司 | High-performance intelligent switch control system and method thereof |
| CN107300635A (en) * | 2017-06-08 | 2017-10-27 | 江苏固德威电源科技股份有限公司 | Compatible star and the alternating voltage method of sampling and device of triangle power network |
| CN107340420A (en) * | 2017-07-19 | 2017-11-10 | 广东美的暖通设备有限公司 | Detecting voltage by three phase circuit and air conditioner |
| CN108982959A (en) * | 2018-08-01 | 2018-12-11 | 上海金脉电子科技有限公司 | Motor control three-phase voltage sample circuit |
| CN110061710A (en) * | 2019-05-30 | 2019-07-26 | 杭州欧贲科技有限公司 | Highly integrated charge amplifier circuit |
| CN110333384A (en) * | 2019-08-15 | 2019-10-15 | 杭州电子科技大学 | Three-phase alternating voltage high-precision quick detection circuit based on mutual inductor |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048521A (en) * | 2012-12-31 | 2013-04-17 | 浙江雷顿电气科技有限公司 | Voltage detection device of automatic change-over switch |
| CN103091542A (en) * | 2012-12-31 | 2013-05-08 | 浙江雷顿电气科技有限公司 | Voltage detection circuit capable of automatically transferring switch |
| CN105606989A (en) * | 2015-11-05 | 2016-05-25 | 浙江海得新能源有限公司 | Circuit test method, device and system |
| CN106154925A (en) * | 2016-08-09 | 2016-11-23 | 深圳市新国都技术股份有限公司 | High-performance intelligent switch control system and method thereof |
| CN107300635B (en) * | 2017-06-08 | 2019-12-31 | 江苏固德威电源科技股份有限公司 | Alternating current voltage sampling method and device compatible with star-shaped and triangular power grids |
| CN107300635A (en) * | 2017-06-08 | 2017-10-27 | 江苏固德威电源科技股份有限公司 | Compatible star and the alternating voltage method of sampling and device of triangle power network |
| CN107340420A (en) * | 2017-07-19 | 2017-11-10 | 广东美的暖通设备有限公司 | Detecting voltage by three phase circuit and air conditioner |
| CN107340420B (en) * | 2017-07-19 | 2023-11-28 | 广东美的暖通设备有限公司 | Three-phase voltage detection circuit and air conditioner |
| CN108982959A (en) * | 2018-08-01 | 2018-12-11 | 上海金脉电子科技有限公司 | Motor control three-phase voltage sample circuit |
| CN108982959B (en) * | 2018-08-01 | 2021-02-19 | 上海金脉电子科技有限公司 | Three-phase voltage sampling circuit for motor control |
| CN110061710A (en) * | 2019-05-30 | 2019-07-26 | 杭州欧贲科技有限公司 | Highly integrated charge amplifier circuit |
| CN110333384A (en) * | 2019-08-15 | 2019-10-15 | 杭州电子科技大学 | Three-phase alternating voltage high-precision quick detection circuit based on mutual inductor |
| CN110333384B (en) * | 2019-08-15 | 2021-04-13 | 杭州电子科技大学 | Three-phase alternating current voltage high-precision rapid detection circuit based on mutual inductor |
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Application publication date: 20120912 |