Current detection circuit
A technology of current detection circuit and working circuit, which is applied in the direction of measurement using digital measurement technology, can solve the problems of high precision, high response, low cost, and high cost, and achieve high reliability, improved performance, and strong anti-interference ability Effect
Inactive Publication Date: 2013-06-12
DORNA TECH
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Problems solved by technology
Although the solution using Hall sensor + high-precision AD converter can meet the requirements in terms of current accuracy and speed, the cost is relatively high
Although most servo drivers use precision sampling resistors + linear optocouplers + AD sampling chips, the cost is relatively low. Due to the influence of linear optocouplers and AD sampling chips, the effective accuracy is generally around 11 bits, and the response is generally around 10 μs. Meet the requirements of high precision and high response
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[0015] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with illustrations and specific embodiments.
[0016] Such as figure 1 As shown, the current detection circuit proposed by the present invention includes a sampling resistor, an A / D conversion isolation modulation chip and a programmable logic unit, the sampling resistor is connected to the working circuit of the servo driver, and the input terminal of the A / D conversion isolation modulation chip is connected The two ends of the sampling resistor are connected, and the current flows through the sampling resistor to generate a voltage for the A / D conversion isolation modulation chip. The A / D conversion isolation modulation chip converts the analog signal of the voltage into a digital signal, and the A / D conversion isolation modulation chip The output end is connected to the p...
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The invention provides a current detection circuit which comprises a sampling resistor, an A / D (Analogue to Digital) conversion separation modulating chip and a programmable logic unit. The sampling resistor is accessed to a work circuit of a servo driver, the input end of the A / D conversion separation modulating chip is connected with both ends of the sampling resistor, and current flows through the sampling resistor and generates a voltage to the A / D conversion separation modulating chip. The A / D conversion separation modulating chip converts an analogue signal of the voltage to a digital signal, and the output end of the A / D conversion separation modulating chip is connected to the programmable logic unit and feeds the digital signal to the programmable logic unit to be processed. The device samples the current by the sampling resistor in combination of the A / D conversion separation modulating chip and directly feeds high speed data to the programmable logic unit, so that the reliability is high and the antijamming capability is strong. The current detection circuit is applied to a current sampling link of the servo driver, so that the performance of the servo driver is effectively improved.
Description
technical field [0001] The invention relates to a current detection device, in particular to a current detection circuit. Background technique [0002] For a digital servo motor control system, the performance of the current loop directly affects the control effect of the system, and the accuracy and real-time performance of current sampling largely determine the dynamic and static performance of the system. Accurate current detection is to improve the control accuracy of the system, An important part of stability and rapidity is also the key to realizing a high-performance servo closed-loop control system. Although the solution of using Hall sensor + high-precision AD converter can meet the requirements in terms of current accuracy and speed, the cost is relatively high. Although most servo drivers use precision sampling resistors + linear optocouplers + AD sampling chips, the cost is relatively low. Due to the influence of linear optocouplers and AD sampling chips, the ef...
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Inventor 吕春松李社伟易健郁春燕顾超峰
Owner DORNA TECH