Electromagnetic metering pump driving circuit and driving control method

Abstract

The invention relates to an electromagnetic metering pump driving circuit and a control method. The method comprises the following steps: calculating operation parameters such as a starting pulse sequence number, an active demagnetization starting current, an active demagnetization starting time, a demagnetization process starting duty ratio and the like of each step in a stroke frequency period according to system setting and hardware parameters; the K1 is switched off, and the K2 and the K3 are directly switched on; k1 and K2 are driven by using complementary PWM (Pulse Width Modulation) waveforms inserted into a dead zone, and K3 is kept on; the K1 is kept in an off state, and the K2 and the K3 are kept in an on state; k1 is kept in a turn-off state, K2 is kept in a turn-on state, and K3 is driven in a PWM mode; in the liquid suction process, the structure is recovered, and stroke frequency parameters are detected; through the active demagnetization function of the driving control electromagnetic pump and the electromagnetic coil, the characteristic of short demagnetization time is achieved to meet high-speed driving, the driving control method meets the requirement for convenient configuration of driving parameters of the controller, the maximum stroke frequency and the maximum pumping pressure range are effectively expanded, and meanwhile the design requirement for a heat dissipation structure of a pump body is lowered.

Description

technical field [0001] The invention relates to the field of electromagnetic metering pumps, in particular to a drive circuit and a drive control method of an electromagnetic metering pump. Background technique [0002] Electromagnetic metering pump is a kind of pump body that generates a certain frequency of magnetic force by driving the electromagnetic coil to turn on and off, and uses excitation and degaussing to drive the diaphragm to move, and the change of the diaphragm to drive the pressure change in the cavity to achieve liquid suction and discharge. The electromagnetic metering pump has the characteristics of low flow rate of pumped liquid and accurate liquid addition. It is mainly used in chemical production, sewage treatment, agricultural breeding and other occasions that require low dose and continuous liquid addition. [0003] At present, the electromagnetic coil drive control of the electromagnetic metering pump mainly controls the power switch tube through the...

AI Technical Summary

Problems solved by technology

In summary, due to the constraints of product design parameters, the value range adjustment of coil resistance and excitation operating current parameters is limited

[0006] (2) High power consumption and severe heat generation

The excitation energy dissipated by the electromagnetic coil through heat needs to be completely dissipated through the casing, the energy utilization efficiency of the power supply is low and higher requirements are placed on the heat dissipation structure of the pump body

[0007] (3) Electromagnetic coil reset operation parameters affect flow instability

Relying on the internal resistance of the electromagnetic coil to generate heat to realize the slow decay of the excitation current, resulting in a long transition time for the magnetic force to pass through the elastic threshold of the return spring, it is easy to cause part of the flow to be effectively pumped out through the pressure extrusion mechanism, and it also receives the coil inductance and internal pressure during operation. The resistance parameter changes with the heating process of the operation, resulting in the flow deviation under the same stroke

[0008] (4) Limit the maximum pumping pressure of the electromagnetic metering pump

The limitation of the maximum excitation current also limits the ability of the same power pump body to expand the maximum pumping pressure model

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