CN203490275U - Double-subtraction alternating current sampling circuit of integrated power supply - Google Patents
Double-subtraction alternating current sampling circuit of integrated power supply Download PDFInfo
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- CN203490275U CN203490275U CN201320630354.5U CN201320630354U CN203490275U CN 203490275 U CN203490275 U CN 203490275U CN 201320630354 U CN201320630354 U CN 201320630354U CN 203490275 U CN203490275 U CN 203490275U
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Abstract
The utility model discloses a double-subtraction alternating current sampling circuit of an integrated power supply. The double-subtraction alternating current sampling circuit of the integrated power supply comprises a reference voltage input terminal, a reference voltage output terminal, a voltage input terminal, a voltage output terminal, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a third diode, a fourth diode, a first amplifier and a second amplifier. According to the utility model, two branches of voltages are employed to respectively detect the current and the voltage, and therefore the sampling precision is improved, the problem existing in the prior art that a high-end current sampling circuit takes samples by using a power supply as a reference is avoided, and the technological difficulty is effectively transformed.
Description
Technical field
The utility model relates to a kind of current sampling device, relates in particular to a kind of two subtraction alternating current sample circuits of integrated power supply.
Background technology
Integrated power supply is to take direct supply as core, the assembly that direct supply and any one power supply and more than one power supplys form, direct supply, for electric power ac uninterrupted power supply (UPS) with inverter for electric power (INV), communicating by letter is combined into one with devices such as DC transformating powers (DC/DC), share the battery pack of direct supply, and the set of equipments of unified monitoring.
In most electric machine speed regulations and other control system, all to use current sample for Current Feedback Control, but a lot of current sampling circuits carry out sampled point as a reference with power supply, the fluctuation of power source loads or electromagnetic interference (EMI) bring interference easily to the collection of sample circuit, sampling precision is not high, in motor, break down or surge circuit, easily sample circuit is caused damage.
Summary of the invention
The purpose of this utility model provides a kind of compact conformation with regard to being in order to address the above problem, two subtraction alternating current sample circuits of the integrated power supply that sampling precision is high.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises reference voltage input terminal, reference voltage output terminal, voltage input end, voltage output end, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first diode, the second diode, the 3rd diode, the 4th diode, the first amplifier and the second amplifier, described reference voltage input terminal respectively with the first end of described the first resistance, the first end of described the second electric capacity is connected with the first end of described the 5th resistance, the second end of described the first resistance is connected with the first end of described the 4th resistance with the electrode input end of described the first amplifier respectively, the output terminal of described the first amplifier is connected with the positive pole of described the second diode, the negative pole of described the second diode respectively with the second end of described the 4th resistance, the negative pole of described the first diode is connected with described voltage output end, described voltage input end respectively with the first end of described the second resistance, the first end of described the first electric capacity, the first end of described the 3rd electric capacity is connected with the first end of described the 6th resistance, the second end of described the second resistance is connected with the first end of described the 3rd resistance with the negative input of described the first amplifier respectively, the second end of described the 3rd resistance respectively with the second end of described the first electric capacity, ground connection after the second end of the positive pole of described the first diode and described the 3rd electric capacity is connected, the second end of described the 6th resistance is connected with the first end of described the 8th resistance with the negative input of described the second amplifier respectively, the electrode input end of described the second amplifier is connected with the second end of described the 5th resistance with the first end of described the 7th resistance respectively, the second end of described the 7th resistance respectively with the second end of described the second electric capacity, ground connection after the positive pole of the first end of described the 4th electric capacity and described the 3rd diode is connected, the second end ground connection of described the 4th electric capacity, the negative pole of described the 3rd diode respectively with the negative pole of described the 4th diode, the second end of described the 8th resistance is connected with described reference voltage output terminal.
The beneficial effects of the utility model are:
The utility model adopts two-way voltage to detect respectively current/voltage, thereby has improved sampling precision, and the drawback of having avoided high-side current sample circuit of the prior art to sample as a reference with power supply, has changed technological difficulties effectively.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the utility model comprises reference voltage input terminal A1, reference voltage output terminal a1, voltage input end B1, voltage output end b2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the first amplifier U1 and the second amplifier U2, reference voltage input terminal A1 respectively with the first end of the first resistance R 1, the first end of the second capacitor C 2 is connected with the first end of the 5th resistance R 5, the second end of the first resistance R 1 is connected with the first end of the 4th resistance R 4 with the electrode input end of the first amplifier U1 respectively, the output terminal of the first amplifier U1 is connected with the positive pole of the second diode D2, the negative pole of the second diode D2 respectively with the second end of the 4th resistance R 4, the negative pole of the first diode D1 is connected with voltage output end b1, voltage input end B1 respectively with the first end of the second resistance R 2, the first end of the first capacitor C 1, the first end of the 3rd capacitor C 3 is connected with the first end of the 6th resistance R 6, and the second end of the second resistance R 2 is connected with the first end of the 3rd resistance R 3 with the negative input of the first amplifier U1 respectively, the second end of the 3rd resistance R 3 respectively with the second end of the first capacitor C 1, ground connection after the second end of the positive pole of the first diode D1 and the 3rd capacitor C 3 is connected, the second end of the 6th resistance R 6 is connected with the first end of the 8th resistance R 8 with the negative input of the second amplifier U2 respectively, the electrode input end of the second amplifier U2 is connected with the second end of the 5th resistance R 5 with the first end of the 7th resistance R 7 respectively, the second end of the 7th resistance R 7 respectively with the second end of the second capacitor C 2, ground connection after the positive pole of the first end of the 4th capacitor C 4 and the 3rd diode D3 is connected, the second end ground connection of the 4th capacitor C 4, the negative pole of the 3rd diode D3 respectively with the negative pole of the 4th diode D4, the second end of the 8th resistance R 8 is connected with reference voltage output terminal a1.
The first via deducts the intermediate value la tension de reference Uref est (2.5v) of sensor sample result with Ui, and then the linear A/D that the is amplified to DSP desired voltage range (0～Ud) of sampling.The second tunnel is contrary, by intermediate value la tension de reference Uref est, deducts sensor output voltage Ui, and equally also linearity is amplified to suitable voltage range.The first diode D1 and the second diode D2 are the voltage stabilizing diode of two 3.3v, amplifier output voltage is played to amplitude limit effect, when Ui value is greater than Uref, Uo1 is output as positive voltage, and voltage range is 0～Ud, and because the existence of the second diode D2 makes electric current can not be injected in amplifier, so the second tunnel amplifier can not be exported negative voltage, but clamper is at 0v, when Ui value is less than Uref, Uo2 is output as positive voltage, same and due to the existence of the first diode D1, making first via amplifier can not export negative voltage, is also that clamper is at 0v.The a certain moment in a sinusoidal period only has the voltage of a road signal output 0～Ud, thereby has improved sampling precision.
Above embodiment is only unrestricted in order to the technical solution of the utility model to be described.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is modified or is equal to replacement, do not depart from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (1)
1. two subtraction alternating current sample circuits for integrated power supply, is characterized in that: comprise reference voltage input terminal, reference voltage output terminal, voltage input end, voltage output end, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first diode, the second diode, the 3rd diode, the 4th diode, the first amplifier and the second amplifier, described reference voltage input terminal respectively with the first end of described the first resistance, the first end of described the second electric capacity is connected with the first end of described the 5th resistance, the second end of described the first resistance is connected with the first end of described the 4th resistance with the electrode input end of described the first amplifier respectively, the output terminal of described the first amplifier is connected with the positive pole of described the second diode, the negative pole of described the second diode respectively with the second end of described the 4th resistance, the negative pole of described the first diode is connected with described voltage output end, described voltage input end respectively with the first end of described the second resistance, the first end of described the first electric capacity, the first end of described the 3rd electric capacity is connected with the first end of described the 6th resistance, the second end of described the second resistance is connected with the first end of described the 3rd resistance with the negative input of described the first amplifier respectively, the second end of described the 3rd resistance respectively with the second end of described the first electric capacity, ground connection after the second end of the positive pole of described the first diode and described the 3rd electric capacity is connected, the second end of described the 6th resistance is connected with the first end of described the 8th resistance with the negative input of described the second amplifier respectively, the electrode input end of described the second amplifier is connected with the second end of described the 5th resistance with the first end of described the 7th resistance respectively, the second end of described the 7th resistance respectively with the second end of described the second electric capacity, ground connection after the positive pole of the first end of described the 4th electric capacity and described the 3rd diode is connected, the second end ground connection of described the 4th electric capacity, the negative pole of described the 3rd diode respectively with the negative pole of described the 4th diode, the second end of described the 8th resistance is connected with described reference voltage output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320630354.5U CN203490275U (en) | 2013-10-13 | 2013-10-13 | Double-subtraction alternating current sampling circuit of integrated power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320630354.5U CN203490275U (en) | 2013-10-13 | 2013-10-13 | Double-subtraction alternating current sampling circuit of integrated power supply |
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| Publication Number | Publication Date |
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| CN203490275U true CN203490275U (en) | 2014-03-19 |
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| CN201320630354.5U Expired - Fee Related CN203490275U (en) | 2013-10-13 | 2013-10-13 | Double-subtraction alternating current sampling circuit of integrated power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273080A (en) * | 2018-12-05 | 2020-06-12 | 纮康科技股份有限公司 | Precision measurement circuit |
-
2013
- 2013-10-13 CN CN201320630354.5U patent/CN203490275U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111273080A (en) * | 2018-12-05 | 2020-06-12 | 纮康科技股份有限公司 | Precision measurement circuit |
| CN111273080B (en) * | 2018-12-05 | 2022-05-03 | 纮康科技股份有限公司 | Precision measurement circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20141013 |
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| EXPY | Termination of patent right or utility model |