CN202562993U - Three-phase voltage sampling circuit - Google Patents
Three-phase voltage sampling circuit Download PDFInfo
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- CN202562993U CN202562993U CN2012201994932U CN201220199493U CN202562993U CN 202562993 U CN202562993 U CN 202562993U CN 2012201994932 U CN2012201994932 U CN 2012201994932U CN 201220199493 U CN201220199493 U CN 201220199493U CN 202562993 U CN202562993 U CN 202562993U
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Abstract
The utility model discloses a three-phase voltage sampling circuit. The three-phase voltage sampling circuit comprises a signal detection circuit connected to a three-phase power supply system. The output end of the signal detection circuit is connected with a signal amplification circuit, and the output end of the signal amplification circuit is connected with a single chip microcomputer for controlling the switch. The signal detection circuit is mainly composed of a sampling resistor R4, a sampling resistor R10 and a sampling resistor R16. The three-phase voltage protection function is newly added, resistors are used for signal detection, the anti-interference ability and the reliability are improved, and the cost is reduced as low as possible at the same time. The detection of phase voltages and line voltages can be realized through different connection methods including the star connection method and the delta connection method according to demands, and the sampled signal is processed through an operational amplifier, and then is sent to the single chip microcomputer for calculation and processing. If the signal is normal, then continues processing is performed on the signal by the single chip microcomputer; and if the signal is abnormal, then an instruction is sent from the single chip microcomputer to a protection execution mechanism to provide protection for load devices.
Description
Technical field
The utility model relates to a kind of voltage sampling circuit, relates 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.
The utility model content
The purpose of the utility model is to provide a kind of three-phase voltage sample circuit, and 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 utility model 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.
The beneficial effect of the utility model 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; Adopt 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 utility model embodiment 1.
Embodiment
Further specify the technical scheme of the utility model 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 utility model embodiment 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 the ultimate principle and the characteristic of the utility model; The utility model is not limited by above-mentioned example; Under the prerequisite that does not break away from the utility model spirit and scope; The utility model also has various variations and change, and these variations and change all fall in the utility model scope that requires protection.The utility model 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201994932U CN202562993U (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201994932U CN202562993U (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202562993U true CN202562993U (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201994932U Expired - Fee Related CN202562993U (en) | 2012-05-07 | 2012-05-07 | Three-phase voltage sampling circuit |
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| CN (1) | CN202562993U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| 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 |
| CN110018341A (en) * | 2019-04-17 | 2019-07-16 | 上海金脉电子科技有限公司 | Phase voltage detection circuit |
-
2012
- 2012-05-07 CN CN2012201994932U patent/CN202562993U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| 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 |
| 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 |
| CN110018341A (en) * | 2019-04-17 | 2019-07-16 | 上海金脉电子科技有限公司 | Phase voltage detection circuit |
| CN110018341B (en) * | 2019-04-17 | 2021-08-17 | 上海金脉电子科技有限公司 | Phase voltage detection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20210507 |