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Anti-interference current sample circuit based on cancellation method

A technology of current sampling and cancellation method, which is applied in the direction of electrical components, adjustment of electric variables, output power conversion devices, etc., can solve the problems of complex circuit implementation and inability to protect over-current, and achieve simple circuit structure and real-time over-current protection. Effects of flow protection and interference filtering

Inactive Publication Date: 2010-02-03
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] At present, there are relatively few studies on the problem of sampling interference. The Sensorless method has a good ability to suppress noise, but due to the lack of real sampling, it is impossible to perform real-time overcurrent protection, and the circuit implementation is too complicated.

Method used

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  • Anti-interference current sample circuit based on cancellation method
  • Anti-interference current sample circuit based on cancellation method
  • Anti-interference current sample circuit based on cancellation method

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Embodiment Construction

[0026] refer to figure 1 As shown, Mp, Mn are the main switching tubes, Mp, Mn’s drain terminals are connected to the inductor, OP is the main sampling circuit, Is is the sampling current of the switching tube MP; Mpx, Mnx are the auxiliary switching tubes, Mpx, the drain terminals of Mnx Not connected to the output, OPX is the auxiliary sampling circuit, and Isx is the current value of the auxiliary sampling. R 1 , R 2 They are the resistances of the main and auxiliary sampling circuits respectively. When the sampling current flows through them, the sampling voltages Vs and Vsx are formed. Among them, Q is a switch control signal, which is generated by the DC-DC control loop to control the turn-on and turn-off of the switch. Since the auxiliary switch is not connected to the output terminal, the sampling current Isx obtained by auxiliary sampling is only a variety of interference signals, and because the environment of the main sampling circuit is the same, the collected i...

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Abstract

The invention discloses an anti-interference current sample circuit based on a cancellation method; on the basis of the traditional method, the anti-interference current sample circuit comprises the following steps: adding a set of relatively small subsidiary switch tubes Mpx and Mnx without output, ensuring the good matching of the subsidiary switch tubes and working switch tubes of Mp and Mn, and carrying out the same sample on the subsidiary switch tubes. The anti-interference current sample circuit can effectively filter the interference caused by power voltage and the on / off motion of theswitch tubes, and the control loop and stability compensation in the circuit can still use the traditional method for conducting real-time overcurrent protection, with simple circuit structure.

Description

technical field [0001] The invention relates to the field of switching power supplies, and is applied to the overcurrent protection circuit of a voltage-mode DC-DC converter (DC-DC) and the current control loop of a current-mode DC-DC converter. Interfering with the current sampling circuit. Background technique [0002] The DC-DC converter has the outstanding advantages of high efficiency, and has become the mainstream solution of power management at present, and has been widely used and developed rapidly in many fields such as communication, computer, and portable electronic equipment. Current sampling is not only used in the overcurrent protection circuit of the voltage mode DC-DC converter, but also widely used in the current control loop of the current mode DC-DC converter. However, when there is strong interference in the current sampling circuit (such as the interference caused by the power supply voltage interference and the switching action of the switching tube), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M1/32H02M3/155
CPCH02M2001/0009H02M3/158H02M1/0009
Inventor 王红义程军屈凡马彦昭
Owner XI AN JIAOTONG UNIV
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