Quick starting circuit for power electromagnetic valve and starting method

Abstract

The invention discloses a quick starting circuit for a power electromagnetic valve and a starting method. A starting system comprises a driving power supply module, the driving power supply module comprises a starting power supply unit, an activating power supply unit and a maintaining power supply unit, the voltage of the starting power supply unit is maximum, and the voltage of the maintaining power supply unit is minimum; when the power electromagnetic valve is started and the power electromagnetic valve is in an activation current establishment time stage, the starting power supply unit serves as a power supply; when the power electromagnetic valve is in an activation stage, the activating power supply unit serves as a power supply; and when the power electromagnetic valve is in a maintaining stage, the maintaining power supply unit serves as a power supply. According to the quick starting circuit for the power electromagnetic valve and the starting method, the establishing time ofdriving current is shortened, quick starting of the power electromagnetic valve is achieved, and the quick response time of the power electromagnetic valve in the starting stage is prolonged.

Description

technical field [0001] The invention relates to the technical field of power solenoid valves, in particular to a quick start circuit and a start method for a power solenoid valve. Background technique [0002] Due to the large inductive component of the power solenoid valve, the load current changes slowly, which eventually leads to a relatively long settling time for the driving current to reach its activation current. Under the same power supply environment, the greater the inductive component of the power solenoid valve, the longer the rise time required for its driving current. When the driving current of the power solenoid valve rises from zero, the following formula is satisfied: [0003] i=I o *[1-e(-t / τ)]=U / R*[1-e(-t*R / L)] [0004] In the above formula, i is the current value at time t, and I o The final steady-state output current value is constant, and its value is equivalent to the quotient of the supply voltage U and the resistive component of the power solen...

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Problems solved by technology

[0007]The conventional solenoid valve driving circuit can only provide two kinds of amplitude driving power modules, after determining the driving power module in the activation phase and the driving power module in the holding phase , the establishment time of the entire activation current is only passively accepted, and the drive current waveform is obtained according to the determined power supply and the resistive and inductive characteristics of the solenoid valve itself

However, due to the large inductive component of the power solenoid valve, the rise time of the drive current will be slower than the rise time of the drive current of the conventional solenoid valve, so the start-up control time of the power solenoid valve is often slower than the start-up response time of the conventional solenoid valve. several times bigger

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