An energy-saving drive device for low-voltage electromagnetic appliances

Abstract

The invention provides an energy-saving drive device for a low-voltage electromagnetic type electric appliance. The energy-saving drive device is characterized in that by the adoption of a PWM technology, an electricity-saving pulse width modulation program is used for controlling pulse width modulation to change the duty ratio, so that breakover currents of a high-power field effect tube enter a control mode with the duty ratio accounting for 20% of time for opening, and square waves, with the duty ratio of 20%, of working frequency are generated; starting and stop buttons are arranged, and a single-chip microcomputer energy-saving drive circuit module comprising an electricity-saving program is integrated into a control circuit of application equipment, and connected among a power source, a starting and stop signal input end and a low-voltage electromagnetic type electric appliance coil to form the energy-saving drive device; the energy-saving drive device can be suitable for low-voltage electromagnetic type electric appliances of different types as long as rated voltage is provided, and reverse voltage withstand parameters of the power tube in the circuit are selected; the energy-saving module circuit can also be made into an independent product and installed along with the low-voltage electromagnetic type electric appliance; or the energy-saving module circuit is embedded into the appliance to be made into the energy-saving low-voltage electromagnetic type electric appliance. Power consumption of the low-voltage electromagnetic type electric appliance is greatly reduced, and the defect of directly cutting off electricity of the low-voltage electromagnetic type electric appliance is overcome.

Description

technical field [0001] The invention belongs to a power drive device, and is an energy-saving drive device, which is used to complete the pull-in and disconnection control of low-voltage electromagnetic appliances such as DC or AC contactors, relays, and solenoid valves. Background technique [0002] At present, DC or AC contactors, relays, solenoid valves and other low-voltage electromagnetic electrical appliances are widely used, especially in the process of switching on and off or flow control of high current and high load. The current flowing through the driving coil of low-voltage electromagnetic appliances must be large enough, and because the coil is an inductive load, the starting current is relatively large, so when this kind of low-voltage electromagnetic appliances work normally, the coil usually maintains a large maintenance current, and the power The power consumption is large, and the heating and power consumption are serious. [0003] Taking a 24v solenoid va...

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Problems solved by technology

Moreover, it does not conform to the control habits of low-voltage electromagnetic appliances. The general control method of low-voltage electromagnetic appliances is to start and stop

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