CN203069647U - DC high-voltage detection circuit - Google Patents
DC high-voltage detection circuit Download PDFInfo
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- CN203069647U CN203069647U CN 201220672157 CN201220672157U CN203069647U CN 203069647 U CN203069647 U CN 203069647U CN 201220672157 CN201220672157 CN 201220672157 CN 201220672157 U CN201220672157 U CN 201220672157U CN 203069647 U CN203069647 U CN 203069647U
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Abstract
The utility model discloses a DC high-voltage detection circuit, comprising a differential proportion reduction circuit, a differential proportion fine tuning circuit and an optical isolation coupler U1. The DC high-voltage signal input to the differential proportion reduction circuit is processed by voltage reduction according to a preset proportion, the processed signal is transmitted to the differential proportion fine tuning circuit for voltage fine tuning, the tuned signal is transmitted to the optical isolation coupler U1 and processed by optical isolation process, and the processed signal is output. According to the DC high-voltage detection circuit, the voltage signal with high linearity is obtained when DC high voltage is detected.
Description
Technical field
The utility model relates to voltage signal detection technique field, relates in particular to a kind of high direct voltage testing circuit.
Background technology
At present, most equipment is driven by DC high-voltage power supply, and these equipment need monitoring in real time that the high drive power source voltage of energy is provided for equipment if be able to stable work.In the prior art, DC voltage testing circuit about low voltage frequency converter, usually certain the output winding by the reverse exciting switching voltage regulator transformer detects, to detect to such an extent that voltage signal transfers to dsp controller and carries out signal and handle again, though this method circuit is simple, and be applicable to low voltage frequency converter, but in the mesohigh frequency converter, there is not linear zone in Switching Power Supply, so, the DC voltage linearity that existing DC voltage testing circuit detects is low, can't directly apply to the mesohigh frequency converter.
The utility model content
The technical problems to be solved in the utility model is, a kind of high direct voltage testing circuit is provided, and when adopting this circuit to carry out the high direct voltage detection, can access the high d. c. voltage signal of the linearity.
For solving the problems of the technologies described above, the utility model adopts following technical scheme.
A kind of high direct voltage testing circuit, it includes a difference ratio and dwindles circuit, a difference ratio trimming circuit and a smooth isolating coupler U1, after described difference ratio is dwindled circuit the high direct voltage signal of its input is carried out step-down and handles according to preset ratio, transfer to difference ratio trimming circuit and carry out voltage trim, transfer to light isolating coupler U1 afterwards and undertaken exporting after the isolation processing by light isolating coupler U1.
Preferably, also include one first voltage follower circuit and one second voltage follower circuit, described first voltage follower circuit is connected between difference ratio trimming circuit and the light isolating coupler U1, the input end of described second voltage follower circuit connects the output terminal of light isolating coupler U1, and described first voltage follower circuit and second voltage follower circuit are all for the d. c. voltage signal of its input is exported in proportion.
Preferably, described difference ratio is dwindled circuit and is included a difference proportional amplifier U2A, the in-phase end of described difference proportional amplifier U2A is in series with resistance R 5 successively, resistance R 18, resistance R 6, resistance R 4 and resistance R 3, the free end of described resistance R 3 dwindles the DC bus-bar voltage negative terminal N of circuit as the difference ratio, this in-phase end also meets front end power supply ground COM2 by resistance R 9, the end of oppisite phase of described difference proportional amplifier U2A is in series with resistance R 16 successively, resistance R 1, resistance R 17, resistance R 15 and resistance R 14, the free end of described resistance R 14 dwindles the DC bus-bar voltage anode P of circuit as the difference ratio, the end of oppisite phase of this difference proportional amplifier U2A also is connected to its output terminal by resistance R 20 and the resistance R 10 of series connection successively, and the tie point of described resistance R 20 and resistance R 10 dwindles the output terminal of circuit as the difference ratio.
Preferably, described difference ratio trimming circuit includes a difference proportional amplifier U2B, the in-phase end of described difference proportional amplifier U2B meets front end power supply ground COM2 by resistance R 7, its end of oppisite phase is connected to the output terminal that the difference ratio is dwindled circuit by resistance R 12, the end of oppisite phase of this difference proportional amplifier U2B also is connected to its output terminal by resistance R 8 and the resistance R 22 of series connection successively, and the tie point of described resistance R 8 and resistance R 22 is as the output terminal of difference ratio trimming circuit.
Preferably, described first voltage follower circuit includes a voltage follower U3B, the in-phase end of described voltage follower U3B is connected to the output terminal of difference ratio trimming circuit by resistance R 21, its end of oppisite phase meets front end power supply ground COM2 by resistance R 13, its output terminal is connected to the luminotron anode of light isolating coupler U1 by resistance R 19, the luminotron negative electrode of described smooth isolating coupler U1 is connected to front end power supply ground COM2, the first photosensitive tube collector of this light isolating coupler U1 is connected to front end power end VCC, its first photosensitive tube emitter is connected to the end of oppisite phase of voltage follower U3B, the second photosensitive tube collector of described smooth isolating coupler U1 is connected to rear end power end VDD, and its second photosensitive tube emitter is as the output terminal of light isolating coupler U1.
Preferably, described second voltage follower circuit includes a voltage follower U4A, output terminal and the tie point of the two that the in-phase end of described voltage follower U4A is connected to light isolating coupler U1 pass through resistance R 2 ground connection, be connected with resistance R 11 between the end of oppisite phase of this voltage follower U4A and the output terminal, and this end of oppisite phase is as the output terminal of second voltage follower circuit.
Preferably, the chip model of described smooth isolating coupler U1 is LOC110S.
In the disclosed high direct voltage testing circuit of the utility model, dwindle circuit and with the step-down roughly according to default ratio of the high direct voltage signal that detects by the difference ratio, the passing ratio trimming circuit is done further to adjust to this d. c. voltage signal again, by light isolating coupler U1 that preceding terminal voltage signal is isolated with the back terminal voltage signal afterwards, to obtain the lower d. c. voltage signal of magnitude of voltage, at last this d. c. voltage signal is fed back to dsp controller and do further signal processing, thereby realized the detection to the high direct voltage signal.In the said process, handle because the high direct voltage signal has passed through the step-down that the difference ratio dwindles circuit and difference ratio trimming circuit, therefore, adopt the utility model to carry out high direct voltage when detecting, can access linearity higher voltage signal.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is done more detailed description.
The utility model discloses a kind of high direct voltage testing circuit, as shown in Figure 1, it includes a difference ratio and dwindles circuit 10, a difference ratio trimming circuit 20 and one smooth isolating coupler U1, after described difference ratio is dwindled circuit 10 the high direct voltage signal of its input is carried out step-down and handles according to preset ratio, transfer to difference ratio trimming circuit 20 and carry out voltage trim, transfer to light isolating coupler U1 afterwards and undertaken exporting after the isolation processing by light isolating coupler U1.In this high direct voltage testing circuit, dwindle circuit 10 and with the step-down roughly according to default ratio of the high direct voltage signal that detects by the difference ratio, 20 pairs of d. c. voltage signals of passing ratio trimming circuit are done further to adjust again, by light isolating coupler U1 that preceding terminal voltage signal is isolated with the back terminal voltage signal afterwards, to obtain the lower d. c. voltage signal of magnitude of voltage, at last this d. c. voltage signal is fed back to dsp controller and do further signal processing, thereby realized the detection to the high direct voltage signal.In the said process, handle because the high direct voltage signal has passed through the step-down that the difference ratio dwindles circuit 10 and difference ratio trimming circuit 20, therefore, adopt the utility model to carry out high direct voltage when detecting, can access the high voltage signal of the linearity.
In the present embodiment, as shown in Figure 1, this high direct voltage testing circuit also includes one first voltage follower circuit 30 and one second voltage follower circuit 40, described first voltage follower circuit 30 is connected between difference ratio trimming circuit 20 and the light isolating coupler U1, the input end of described second voltage follower circuit 40 connects the output terminal of light isolating coupler U1, described first voltage follower circuit 30 and second voltage follower circuit 40 be all for exporting the d. c. voltage signal of its input in proportion, thereby improve the carrying load ability of circuit.
In conjunction with Figure 1 and Figure 2, described difference ratio is dwindled circuit 10 and is included a difference proportional amplifier U2A, the in-phase end of described difference proportional amplifier U2A is in series with resistance R 5 successively, resistance R 18, resistance R 6, resistance R 4 and resistance R 3, the free end of described resistance R 3 dwindles the DC bus-bar voltage negative terminal N of circuit 10 as the difference ratio, this in-phase end also meets front end power supply ground COM2 by resistance R 9, the end of oppisite phase of described difference proportional amplifier U2A is in series with resistance R 16 successively, resistance R 1, resistance R 17, resistance R 15 and resistance R 14, the free end of described resistance R 14 dwindles the DC bus-bar voltage anode P of circuit 10 as the difference ratio, the end of oppisite phase of this difference proportional amplifier U2A also is connected to its output terminal by resistance R 20 and the resistance R 10 of series connection successively, and the tie point of described resistance R 20 and resistance R 10 dwindles the output terminal of circuit 10 as the difference ratio.Wherein, the difference ratio is dwindled circuit 10 output end voltage Vout and input terminal voltage Vin and is satisfied:
R20/（R16+R1+R17+R15+R14）=Vout/Vin；
That is:
Vout=R20/（R16+R1+R17+R15+R14）*Vin；
In the practical application, can pass through to adjust the size of above-mentioned resistance, and further set the ratio of output voltage and input voltage, making the difference ratio dwindle circuit 10 can dwindle the high direct voltage signal of its input in this ratio.
In conjunction with Figure 1 and Figure 2, described difference ratio trimming circuit 20 includes a difference proportional amplifier U2B, the in-phase end of described difference proportional amplifier U2B meets front end power supply ground COM2 by resistance R 7, its end of oppisite phase is connected to the output terminal that the difference ratio is dwindled circuit 10 by resistance R 12, the end of oppisite phase of this difference proportional amplifier U2B also is connected to its output terminal by resistance R 8 and the resistance R 22 of series connection successively, and the tie point of described resistance R 8 and resistance R 22 is as the output terminal of difference ratio trimming circuit 20.Wherein, the output voltage V out1 of difference ratio trimming circuit 20 and input voltage vin 1 satisfy:
R8/R12=Vout1/Vin1；
That is:
Vout1=R8/R12*Vin1；
In the practical application, can finely tune the input signal of this difference ratio trimming circuit 20 by the size of adjusting resistance R 8 or resistance R 22, more accurate with the voltage signal that makes its output.
In conjunction with Figure 1 and Figure 2, described first voltage follower circuit 30 includes a voltage follower U3B, the in-phase end of described voltage follower U3B is connected to the output terminal of difference ratio trimming circuit 20 by resistance R 21, its end of oppisite phase meets front end power supply ground COM2 by resistance R 13, its output terminal is connected to the luminotron anode of light isolating coupler U1 by resistance R 19, the luminotron negative electrode of described smooth isolating coupler U1 is connected to front end power supply ground COM2, the first photosensitive tube collector of this light isolating coupler U1 is connected to front end power end VCC, its first photosensitive tube emitter is connected to the end of oppisite phase of voltage follower U3B, the second photosensitive tube collector of described smooth isolating coupler U1 is connected to rear end power end VDD, and its second photosensitive tube emitter is as the output terminal of light isolating coupler U1.Described second voltage follower circuit 40 includes a voltage follower U4A, output terminal and the tie point of the two that the in-phase end of described voltage follower U4A is connected to light isolating coupler U1 pass through resistance R 2 ground connection, be connected with resistance R 11 between the end of oppisite phase of this voltage follower U4A and the output terminal, and this end of oppisite phase is as the output terminal of second voltage follower circuit 40.Wherein, utilize the characteristics that voltage follower input impedance is big, output impedance is little, improve the driving force of circuit and reduce load to the influence of circuit performance, thereby make detected voltage signal more accurate.
In the present embodiment, the chip model of light isolating coupler U1 is LOC110S, and still, in other embodiment of the present utility model, light isolating coupler U1 can also be the isolation output device of other models.
In the disclosed high direct voltage testing circuit of the utility model, dwindle circuit 10 and with the step-down roughly according to default ratio of the high direct voltage signal that detects by the difference ratio, 20 pairs of d. c. voltage signals of passing ratio trimming circuit are done further to adjust again, by light isolating coupler U1 preceding terminal voltage signal and back terminal voltage signal are isolated afterwards, to obtain the lower d. c. voltage signal of magnitude of voltage, at last this d. c. voltage signal is fed back to dsp controller and do further signal processing, thereby realized the detection to the high direct voltage signal, the utility model can effectively be applied in the frequency converter, simultaneously, this high direct voltage testing circuit also utilizes first voltage follower circuit 30 and second voltage follower circuit 40 and improves the driving force of circuit and reduce load to the influence of circuit performance, makes detected voltage signal more accurate.Therefore, when adopting the utility model to carry out the high direct voltage detection, can access the high voltage signal of the linearity.
The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.
Claims (7)
1. high direct voltage testing circuit, it is characterized in that, the difference ratio that includes is dwindled circuit (10), a difference ratio trimming circuit (20) and a smooth isolating coupler U1, after described difference ratio is dwindled circuit (10) the high direct voltage signal of its input is carried out step-down and handles according to preset ratio, transfer to difference ratio trimming circuit (20) and carry out voltage trim, transfer to light isolating coupler U1 afterwards and undertaken exporting after the isolation processing by light isolating coupler U1.
2. high direct voltage testing circuit as claimed in claim 1, it is characterized in that, also include one first voltage follower circuit (30) and one second voltage follower circuit (40), described first voltage follower circuit (30) is connected between difference ratio trimming circuit (20) and the light isolating coupler U1, the input end of described second voltage follower circuit (40) connects the output terminal of light isolating coupler U1, and described first voltage follower circuit (30) and second voltage follower circuit (40) are all for the d. c. voltage signal of its input is exported in proportion.
3. high direct voltage testing circuit as claimed in claim 1, it is characterized in that, described difference ratio is dwindled circuit (10) and is included a difference proportional amplifier U2A, the in-phase end of described difference proportional amplifier U2A is in series with resistance R 5 successively, resistance R 18, resistance R 6, resistance R 4 and resistance R 3, the free end of described resistance R 3 dwindles the DC bus-bar voltage negative terminal N of circuit (10) as the difference ratio, this in-phase end also meets front end power supply ground COM2 by resistance R 9, the end of oppisite phase of described difference proportional amplifier U2A is in series with resistance R 16 successively, resistance R 1, resistance R 17, resistance R 15 and resistance R 14, the free end of described resistance R 14 dwindles the DC bus-bar voltage anode P of circuit (10) as the difference ratio, the end of oppisite phase of this difference proportional amplifier U2A also is connected to its output terminal by resistance R 20 and the resistance R 10 of series connection successively, and the tie point of described resistance R 20 and resistance R 10 dwindles the output terminal of circuit (10) as the difference ratio.
4. high direct voltage testing circuit as claimed in claim 1, it is characterized in that, described difference ratio trimming circuit (20) includes a difference proportional amplifier U2B, the in-phase end of described difference proportional amplifier U2B meets front end power supply ground COM2 by resistance R 7, its end of oppisite phase is connected to the output terminal that the difference ratio is dwindled circuit (10) by resistance R 12, the end of oppisite phase of this difference proportional amplifier U2B also is connected to its output terminal by resistance R 8 and the resistance R 22 of series connection successively, and the tie point of described resistance R 8 and resistance R 22 is as the output terminal of difference ratio trimming circuit (20).
5. high direct voltage testing circuit as claimed in claim 2, it is characterized in that, described first voltage follower circuit (30) includes a voltage follower U3B, the in-phase end of described voltage follower U3B is connected to the output terminal of difference ratio trimming circuit (20) by resistance R 21, its end of oppisite phase meets front end power supply ground COM2 by resistance R 13, its output terminal is connected to the luminotron anode of light isolating coupler U1 by resistance R 19, the luminotron negative electrode of described smooth isolating coupler U1 is connected to front end power supply ground COM2, the first photosensitive tube collector of this light isolating coupler U1 is connected to front end power end VCC, its first photosensitive tube emitter is connected to the end of oppisite phase of voltage follower U3B, the second photosensitive tube collector of described smooth isolating coupler U1 is connected to rear end power end VDD, and its second photosensitive tube emitter is as the output terminal of light isolating coupler U1.
6. high direct voltage testing circuit as claimed in claim 5, it is characterized in that, described second voltage follower circuit (40) includes a voltage follower U4A, output terminal and the tie point of the two that the in-phase end of described voltage follower U4A is connected to light isolating coupler U1 pass through resistance R 2 ground connection, be connected with resistance R 11 between the end of oppisite phase of this voltage follower U4A and the output terminal, and this end of oppisite phase is as the output terminal of second voltage follower circuit (40).
7. as claim 1,2,5 or 6 described high direct voltage testing circuits, it is characterized in that the chip model of described smooth isolating coupler U1 is LOC110S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220672157 CN203069647U (en) | 2012-12-07 | 2012-12-07 | DC high-voltage detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220672157 CN203069647U (en) | 2012-12-07 | 2012-12-07 | DC high-voltage detection circuit |
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| CN203069647U true CN203069647U (en) | 2013-07-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459274A (en) * | 2014-11-19 | 2015-03-25 | 中国计量科学研究院 | Measuring method for voltage coefficient of high voltage standard capacitor |
| CN104678247A (en) * | 2015-02-15 | 2015-06-03 | 北京航天计量测试技术研究所 | Device for measuring electric leakage of 28V power supply |
| CN106199138A (en) * | 2016-08-30 | 2016-12-07 | 中广核达胜加速器技术有限公司 | A kind of for detecting accelerator electrode plate voltage and the device of frequency |
| CN106841763A (en) * | 2016-12-16 | 2017-06-13 | 大禹电气科技股份有限公司 | A kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method |
-
2012
- 2012-12-07 CN CN 201220672157 patent/CN203069647U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459274A (en) * | 2014-11-19 | 2015-03-25 | 中国计量科学研究院 | Measuring method for voltage coefficient of high voltage standard capacitor |
| CN104678247A (en) * | 2015-02-15 | 2015-06-03 | 北京航天计量测试技术研究所 | Device for measuring electric leakage of 28V power supply |
| CN106199138A (en) * | 2016-08-30 | 2016-12-07 | 中广核达胜加速器技术有限公司 | A kind of for detecting accelerator electrode plate voltage and the device of frequency |
| CN106841763A (en) * | 2016-12-16 | 2017-06-13 | 大禹电气科技股份有限公司 | A kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method |
| CN106841763B (en) * | 2016-12-16 | 2023-11-24 | 大禹电气科技股份有限公司 | Voltage detection circuit and voltage detection method for medium-voltage and high-voltage variable-frequency speed regulation device |
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Granted publication date: 20130717 |
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