Peak Hold Drive Method

Abstract

The invention discloses a peak value holding driving method. Time duration of peak value current values wished to maintain is divided into a plurality of sections according to fixed time intervals, and the fixed time intervals are called as step length. When a peak value enters other sections excepting a first section, a power supply is cut off from the inside of a peak value holding driving device, a step length timer is reset, and the power supply is opened from the inside. The step length timer is used for monitoring duration of each section. A peak of the peak value holding driving method only improves a peak value current section which is divided into a plurality of section, and a final section can be naturally transited to a holding current section. The peak value holding driving method enables the existing peak value holding driving piece to be free of hardware improvement, accurate control of any time duration of the peak value section is achieved, and the peak value holding driving method is particularly suitable to driving of a super-speed switch solenoid valve of an automobile automatic gearbox.

Description

technical field [0001] This application relates to a peak-hold (Peak&Hold) driving method for inductive loads. Background technique [0002] Inductive load refers to a load with inductive parameters, which has the characteristic that the load current lags behind the load voltage by a phase difference compared with the power supply. Inductive loads require a starting current that is much larger (usually 3-7 times) than the current required to maintain normal operation when starting. Peak hold is a relatively advanced driving method for inductive loads such as solenoid valves and solenoids. [0003] see figure 1 , which is the schematic diagram of the peak hold driving method taking the solenoid valve as an example, and the rest of the inductive loads are similar. [0004] When the solenoid valve is controlled to open, it is necessary to charge the coil to generate a magnetic field to force the valve core (or other actuators) to overcome the spring resistance and static fri...

AI Technical Summary

Problems solved by technology

However, the existing peak-hold drive devices only provide a small number of setting values ​​for each parameter to choose from, and cannot achieve precise controllability of any value.

For example, some inductive loads need to maintain the peak current value in a relatively long time range, and the existing peak-hold drive devices cannot meet this demand

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