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Method for sampling average current of chopper in state of interrupted output current

A technology of output current and intermittent state, applied in the direction of measuring current/voltage, using DC to AC for measurement, instruments, etc., to achieve the effect of improving work performance and improving accuracy

Inactive Publication Date: 2010-06-30
北京京仪椿树整流器有限责任公司
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Problems solved by technology

However, when the output current is discontinuous, because the current is zero for a period of time in a switching cycle, at this time, the average value of the output current cannot be obtained by sampling the current value at the midpoint of the current rising interval. value

Method used

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  • Method for sampling average current of chopper in state of interrupted output current
  • Method for sampling average current of chopper in state of interrupted output current
  • Method for sampling average current of chopper in state of interrupted output current

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Embodiment Construction

[0011] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application. The present invention is described by taking a step-down chopper circuit as an example. figure 1 It is a schematic diagram of a step-down chopper circuit involved in an embodiment of the present invention. Such as figure 1 As shown, the chopper mainly includes a DC power supply E, a switch tube Q, an energy storage inductor L, a freewheeling diode D, and the like.

[0012] figure 2 It is the output current waveform diagram of the chopper when the output current is intermittent in the embodiment of the present invention. Such as figure 2 As shown, in a cycle T, the output current in the discontinuous state can be roughly divided into D 1 、D 2 、D 3 Three intervals, where D 1 For a given duty cycle, in the interv...

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Abstract

The invention discloses a method for sampling an average value of the output current of a chopper in the state of interrupted output current in the technical field of circuit control. The technical scheme of the method comprises the following steps of: obtaining basic parameters, such as switch frequency and the like, for the work of a switch tube of the chopper; sampling the input voltage and output voltage of the chopper under the condition of a given duty ratio D1 and sampling a current value Is at a midpoint of an output current rising interval; and calculating the average current value of the chopper in the state of the interrupted output current according to a certain algorithm after an input voltage value, an output voltage value and the current value at the midpoint of the output current rising interval of the chopper in the state of the interrupted output current. The method has the advantages of effectively improving the sampling accuracy of the average current of the chopper and greatly improving the working performance of the chopper.

Description

technical field [0001] The invention belongs to the technical field of circuit control, and in particular relates to an average current sampling method of a chopper in an intermittent output current state. Background technique [0002] In the case of continuous output current, sampling the average output current of the chopper only needs to sample the current value at the midpoint of the output current rising interval, and the average value of the output current can be easily obtained. However, when the output current is discontinuous, because the current is zero for a period of time in a switching cycle, at this time, the average value of the output current cannot be obtained by sampling the current value at the midpoint of the current rising interval. value. Contents of the invention [0003] The object of the present invention is to provide an average current sampling method of a chopper in an intermittent output current state, which is used to improve the average curr...

Claims

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Application Information

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IPC IPC(8): G01R19/04G01R19/18G01R19/00
Inventor 贺明智何雄郭文杰李志君孙利娟
Owner 北京京仪椿树整流器有限责任公司
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