Self-excitation driving follow current control device

Abstract

The invention relates to a self-excitation driving follow current control device which belongs to the technical field of DC power control. The device comprises a self-excitation oscillating circuit, arectification filtering circuit, a driving circuit and a VMOS switching circuit, wherein the self-excitation oscillating circuit mainly comprises a triode and an oscillating coil and is used for enhancing inputted low voltage to required high-frequency pulse voltage to output; the rectification filtering circuit mainly comprises a rectification diode and a filtering capacitor and is used for converting the inputted high-frequency pulse voltage into working voltage; the driving circuit mainly comprises a timer and a charging and discharging circuit and is used for outputting the inputted working voltage in definite time to driving control voltage with time intervals for driving a secondary circuit; and the VMOS switching circuit mainly comprises a VMOS device connected with a follow current diode in parallel and is used for switching assistant follow current according to preset time intervals under the drive of the inputted driving control voltage. The device can ensure that the powersupply of a battery pack is recovered when an individual battery fails, effectively prevent the follow current diode from being overheated simultaneously and prevent other batteries of the battery pack from being damaged.

Description

technical field [0001] The invention relates to a freewheeling control device, in particular to a self-excited drive freewheeling control device, which belongs to the technical field of DC power supply control. Background technique [0002] As far as the applicant knows, in the DC battery pack power supply system, it often happens that individual batteries connected to the DC battery pack power supply are abnormal due to failure (voltage drop, no current, etc.) or external conditions (such as ambient temperature, illuminance, vibration, etc.) Changes cause the battery to fail to provide electrical energy (voltage, current) normally, and when a critical failure characteristic occurs and a negative voltage forms a resistance, the battery becomes an "electric load", which will consume a large amount of energy from other batteries in the power supply system. fever. If this situation is not dealt with in time, it will damage other good batteries in the battery pack. In many cas...

AI Technical Summary

Problems solved by technology

Therefore, the power consumed by the diode will reach 10W-20W or more. Not only will the diode itself generate heat at high temperature, it will be easily damaged, and even the adjacent battery will be damaged, which will cause safety problems and unreliable hidden dangers; Chip short-circuit freewheeling is not reliable enough. The first reason is that the diode burns out quickly under the action of high current, so that the contact piece has no time to close the short circuit; second, the temperature-controlled short-circuit distance of the contact piece cannot be accurately measured and set; The chip forms a short circuit, and after the temperature drops, it forms an open circuit and cannot continue to flow

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