Push-pull energy storage type PWM power driving circuit

Abstract

The invention discloses a push-pull energy storage type PWM power driving circuit. Relates to a power driving circuit, in particular to a proportion electromagnet power driving circuit. The power tube isolation driving circuit is connected with a proportion electromagnet and comprises a power tube isolation driving module, the power tube isolation driving module comprises a gate pole driving chip U3, the gate pole driving chip U3 outputs PWM signals through an LO port and an HO port of the gate pole driving chip U3, and the power tube isolation driving circuit further comprises an asymmetric bridge circuit module and a boost energy storage module. According to the push-pull energy storage type PWM power driving circuit, the energy stored by the coil of the proportional electromagnet is recycled, the charging and discharging time of the coil is shortened through the energy, the frequency response of the proportional electromagnet is accelerated, secondary utilization of the energy is achieved, and the service life of the proportional electromagnet is prolonged. And meanwhile, the problem of temperature rise caused by overlong coil discharge time and excessive electric energy consumption of a circuit resistive element is effectively relieved.

Description

technical field [0001] The invention relates to a power drive circuit, in particular to a proportional electromagnet power drive circuit. Background technique [0002] The electro-hydraulic proportional valve plays an indispensable role in the field of hydraulic control. As the electro-mechanical converter of the electro-hydraulic proportional valve, the proportional electromagnet has a very important influence on the reliability of the electro-hydraulic proportional control system, and the power drive The unit is the front link of the electro-hydraulic proportional control system. The performance of the power drive circuit affects the input and output characteristics of the proportional electromagnet, which in turn affects the control performance and reliability of the entire system. [0003] The power drive circuit of the proportional electromagnet is mainly divided into two categories, one is the analog power drive, this kind of power drive technology is relatively mature...

AI Technical Summary

Problems solved by technology

[0003] The power drive circuit of the proportional electromagnet is mainly divided into two categories, one is the analog power drive, this kind of power drive technology is relatively mature, and the steady-state control performance is good, but the power amplifier tube in the circuit always works in the saturation area, and the power consumption is large , low efficiency, poor cooling effect

The other type is switch-type power drive circuit. At present, there are two main types of switch-type power drive circuits, namely, single-tube modulation type and reverse connection unloading type; although the single-tube modulation type power drive has a simple structure, it reduces the power power consumption, but the dynamic response is relatively poor, and the amplitude and frequency of the flutter signal cannot be adjusted independently; compared with the single-tube modulation type, the reverse connection unloading power drive circuit speeds up the speed of the proportional solenoid coil current drop, and the current rise speed did not improve

[0004] In addition, in the existing technology, Nie Yong of Zhejiang University proposed a three-state modulation power drive circuit, which increases the speed of coil current rise and fall, but this improvement is mainly completed by the control algorithm, which increases the main control The load, structure and control signal logic of the unit are complex, which is not conducive to popularization and use

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