CN201569695U - High-precision current sampling circuit for servo system - Google Patents
High-precision current sampling circuit for servo system Download PDFInfo
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- CN201569695U CN201569695U CN200920297809XU CN200920297809U CN201569695U CN 201569695 U CN201569695 U CN 201569695U CN 200920297809X U CN200920297809X U CN 200920297809XU CN 200920297809 U CN200920297809 U CN 200920297809U CN 201569695 U CN201569695 U CN 201569695U
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- integrated hall
- operational amplifier
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Abstract
The utility model relates to a high-precision current sampling circuit for a servo system, comprising an integrated Hall current sensor circuit, an operational amplifier circuit and a clamping circuit. A current sampling channel of the integrated Hall current sensor circuit is connected in series in the phase line of a servo motor, and the current signal of the phase line is converted into an analog voltage signal in a proportional relation. The output end of the integrated Hall current sensor circuit is connected with the in-phase end of the operational amplifier circuit, and the operational amplifier circuit amplifies the voltage signal and carries out level switching. The output end of an operation amplifier is connected with the clamping circuit, and the clamping circuit protects the voltage signal to be input to an analog-digital conversion unit of DSP (Digital Signal Processing). The utility model has the advantages of good linearity and high precision.
Description
Technical field
The utility model relates to a kind of current sampling circuit that is used for electronic circuit.
Background technology
The Digital AC servo-drive system is widely used in industry light industry textile industry machinery, all kinds of numerically-controlled machine and some other automatic assembly line.When realizing its control algolithm, need sample to the phase current of servomotor, participate in computing.The sample circuit of present AC servo mainly adopts the mode of current Hall and current sampling resistor and linear optical coupling to realize sampling to the AC servo motor phase current.For first kind of mode, current Hall is serially connected in the phase line of servomotor, and its current signal output is amplified through operational amplifier, through the AD modulus conversion chip analog current signal is converted to digital signal output again.This sample circuit is because the volume of Hall is big, the weak point that cost is high, and sampling precision is not high.For the second way, in the phase line of servomotor, be connected in series sampling resistor, adopt sampling resistor, the phase current amount of servomotor is converted into voltage.The sampling resistor two ends are connected with the elementary of linear optical coupling, and the secondary and operational amplification circuit of linear optical coupling is connected, and output obtains corresponding digital quantity through the AD analog to digital conversion.
The shortcoming of the current sampling circuit of prior art is:
1. for the current sampling circuit that adopts current Hall, current Hall exists volume big, and the linearity of the analog current signal of the weak point that cost is high, especially its output is low, causes the not high defective of sampling precision.
2. for the current sampling circuit that adopts sampling resistor and linear optical coupling, its sampling resistor requires resistance very low, is generally the milliohm level, requires the precision of sampling resistor very high simultaneously.But resistance value inevitably can appear in general sampling resistor has drift phenomenon to take place, and it is bigger to be subjected to environment factor influence such as temperature simultaneously.The range of linearity of linear optical coupling is little, input and output linear relatively poor, and vary with temperature bigger.
3. for the current sampling circuit that adopts sampling resistor and linear optical coupling, because all there is error in two links of sampling resistor and linear optical coupling, the global error of system power sampling is difficult to guarantee.
4. for the higher servo-drive system of power ratio, adopt the scheme of sampling resistor and linear optical coupling to be difficult to meet the demands.
Summary of the invention
The utility model will solve existing current sampling circuit and have the not high problem of poor linearity, precision, and the high-precision current sampling circuit that is used for servo-drive system that a kind of linearity is good, precision is high is provided.
The technical solution of the utility model:
The high-precision current sampling circuit that is used for servo-drive system, it is characterized in that: comprise integrated Hall current sensor circuit, operational amplification circuit, clamping circuit, the current sample passage of described integrated Hall current sensor circuit seals in the servomotor phase line, the current signal of phase line is converted to the analog voltage signal of proportionate relationship;
The output terminal of described integrated Hall current sensor circuit is connected with the operational amplification circuit in-phase end, and described operational amplification circuit amplifies voltage signal and level conversion;
The output terminal of described operational amplifier is connected with clamping circuit, and described clamping circuit protection voltage signal is input to the AD conversion unit of DSP.
Further, described integrated Hall current sensor circuit comprises integrated Hall current sensor, the current sample input channel anode of described integrated Hall current sensor is connected with the anode of phase line, its negative terminal is connected with the negative terminal of phase line, the power end Vcc of described integrated Hall current sensor is connected with first electric capacity with power supply, the other end of first electric capacity is connected with GND, the Fitter end of described integrated Hall current sensor is connected with second electric capacity, the other end of second electric capacity is connected with GND, the GND end of described integrated Hall current sensor is connected with GND, and the voltage output end Vout of described integrated Hall current sensor is connected with first resistance.
Further, described operational amplification circuit comprises two operational amplifiers, the in-phase end of described first operational amplifier is connected with first resistance, its backward end is connected with second resistance, the 3rd resistance, the other end of described second resistance is connected with GND, the other end of described the 3rd resistance is connected with the output terminal of the 4th resistance with first operational amplifier, and the power end of described first operational amplifier connects positive-negative power; The in-phase end of described second operational amplifier is connected with the 4th resistance, the 5th resistance, and the other end of described the 5th resistance is connected with GND, and the backward end of described second operational amplifier is connected with its output terminal.
Further, described clamping circuit comprises two clamp diodes, and is the backward end of described second operational amplifier is connected back and first clamp diode, second clamp diode with output terminal and connect to hold and be connected, and is connected with DSP.
The beneficial effects of the utility model:
1. adopt the SOIC8 encapsulation, volume is very little, be adapted at layout on the circuit board, and cost is lower.
2. adopt the Hall effect principle, but make that in the chip internal processing output quantity is a voltage, realized the conversion of the magnitude of current to voltage, littler, with better function than traditional current Hall volume.
3. be integrated current sensor chip owing to what adopt, there is copper current channel on its inner close surface, and its resistance is little and stable, makes can react accurately by the magnitude of current size of Copper Foil.
This circuit global error guaranteed＜5%, bandwidth＞50khz.
5. capacity cell is fewer, and dynamic property is guaranteed; And element is few, and power supply is few, and circuit is simple.
6. can satisfy the application demand that adapts to different capacity.
7. need not light-coupled isolation, promptly can realize the electrical isolation of servomotor phase line end and aanalogvoltage output terminal.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
With reference to Fig. 1, the high-precision current sampling circuit that is used for servo-drive system, comprise integrated Hall current sensor circuit 1, operational amplification circuit 2, clamping circuit 3, the current sample passage of described integrated Hall current sensor circuit 1 seals in the servomotor phase line, the current signal of phase line is converted to the analog voltage signal of proportionate relationship;
The output terminal of described integrated Hall current sensor circuit 1 is connected with operational amplification circuit 2 in-phase ends, and described operational amplification circuit 2 amplifies voltage signal and level conversion;
The output terminal of described operational amplifier 2 is connected with clamping circuit 3, and described clamping circuit 3 protection voltage signals are input to the AD conversion unit of DSP.
Described integrated Hall current sensor circuit 1 comprises integrated Hall current sensor U1, the current sample input channel anode of described integrated Hall current sensor U1 is connected with the anode of phase line, its negative terminal is connected with the negative terminal of phase line, the power end Vcc of described integrated Hall current sensor U1 is connected with first capacitor C 1 with power supply, the other end of first capacitor C 1 is connected with GND, the Fitter end of described integrated Hall current sensor U1 is connected with second capacitor C 2, the other end of second capacitor C 2 is connected with GND, the GND end of described integrated Hall current sensor U1 is connected with GND, and the voltage output end Vout of described integrated Hall current sensor U1 is connected with first resistance R 1.
Described operational amplification circuit 2 comprises two operational amplifier U2, U3, the in-phase end of the described first operational amplifier U2 is connected with first resistance R 1, its backward end is connected with second resistance R 2, the 3rd resistance R 3, the other end of described second resistance R 2 is connected with GND, the other end of described the 3rd resistance R 3 is connected with the output terminal of the 4th resistance R 4 and the first operational amplifier U2, and the power end of the described first operational amplifier U2 connects positive-negative power; The in-phase end of the described second operational amplifier U3 is connected with the 4th resistance R 4, the 5th resistance R 5, and the other end of described the 5th resistance R 5 is connected with GND, and the backward end of the described second operational amplifier U3 is connected with its output terminal.
Described clamping circuit 3 comprises two clamp diode D1, D2, the backward end of the described second operational amplifier U3 be connected with output terminal back and the first clamp diode D1, second clamp diode D2's and connect to hold and be connected, and be connected with DSP.
The described content of this instructions embodiment only is enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.
Claims (4)
1. the high-precision current sampling circuit that is used for servo-drive system, it is characterized in that: comprise integrated Hall current sensor circuit, operational amplification circuit, clamping circuit, the current sample passage of described integrated Hall current sensor circuit seals in the servomotor phase line, the current signal of phase line is converted to the analog voltage signal of proportionate relationship;
The output terminal of described integrated Hall current sensor circuit is connected with the operational amplification circuit in-phase end, and described operational amplification circuit amplifies voltage signal and level conversion;
The output terminal of described operational amplifier is connected with clamping circuit, and described clamping circuit protection voltage signal is input to the AD conversion unit of DSP.
2. the high-precision current sampling circuit that is used for servo-drive system according to claim 1, it is characterized in that: described integrated Hall current sensor circuit comprises integrated Hall current sensor, the current sample input channel anode of described integrated Hall current sensor is connected with the anode of phase line, its negative terminal is connected with the negative terminal of phase line, the power end Vcc of described integrated Hall current sensor is connected with first electric capacity with power supply, the other end of first electric capacity is connected with GND, the Fitter end of described integrated Hall current sensor is connected with second electric capacity, the other end of second electric capacity is connected with GND, the GND end of described integrated Hall current sensor is connected with GND, and the voltage output end Vout of described integrated Hall current sensor is connected with first resistance.
3. the high-precision current sampling circuit that is used for servo-drive system according to claim 1 and 2, it is characterized in that: described operational amplification circuit comprises two operational amplifiers, the in-phase end of described first operational amplifier is connected with first resistance, its backward end is connected with second resistance, the 3rd resistance, the other end of described second resistance is connected with GND, the other end of described the 3rd resistance is connected with the output terminal of the 4th resistance with first operational amplifier, and the power end of described first operational amplifier connects positive-negative power; The in-phase end of described second operational amplifier is connected with the 4th resistance, the 5th resistance, and the other end of described the 5th resistance is connected with GND, and the backward end of described second operational amplifier is connected with its output terminal.
4. the high-precision current sampling circuit that is used for servo-drive system according to claim 3, it is characterized in that: described clamping circuit comprises two clamp diodes, the backward end of described second operational amplifier is connected back and first clamp diode, second clamp diode with output terminal and connect to hold and be connected, and be connected with DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920297809XU CN201569695U (en) | 2009-12-12 | 2009-12-12 | High-precision current sampling circuit for servo system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920297809XU CN201569695U (en) | 2009-12-12 | 2009-12-12 | High-precision current sampling circuit for servo system |
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| Publication Number | Publication Date |
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| CN201569695U true CN201569695U (en) | 2010-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920297809XU Expired - Lifetime CN201569695U (en) | 2009-12-12 | 2009-12-12 | High-precision current sampling circuit for servo system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957399A (en) * | 2010-09-21 | 2011-01-26 | 中国电力科学研究院 | Digital closed loop type optical fiber current sensor |
| CN112332745A (en) * | 2020-10-20 | 2021-02-05 | 东风汽车集团有限公司 | Three-phase current detection control system and method for motor controller of new energy automobile |
-
2009
- 2009-12-12 CN CN200920297809XU patent/CN201569695U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957399A (en) * | 2010-09-21 | 2011-01-26 | 中国电力科学研究院 | Digital closed loop type optical fiber current sensor |
| CN101957399B (en) * | 2010-09-21 | 2014-04-30 | 中国电力科学研究院 | Digital closed loop type optical fiber current sensor |
| CN112332745A (en) * | 2020-10-20 | 2021-02-05 | 东风汽车集团有限公司 | Three-phase current detection control system and method for motor controller of new energy automobile |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100901 |
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| CX01 | Expiry of patent term |