Cashbox anti-jamming circuit and circuit anti-jamming method

Abstract

The invention discloses a cashbox anti-jamming circuit and a circuit anti-jamming method. The cashbox anti-jamming circuit comprises a 12V power supply, a cashbox coil, an audion, a grounded terminal, a resistor, a free-wheeling diode and a TVS diode; the 12V power supply can generate a power supply signal when a cashbox needs to be opened, the cashbox coil generates charges opposite to those of an electromagnet for closing the cashbox to a central electromagnet when the cashbox is opened, the audion controls the on-off state of a circuit when the cashbox control signal terminal is in a high-level or low-level state, the grounded terminal forms a closed loop for the circuit, the resistor enables the cashbox to keep a closed state when the cashbox does not receive a power supply switch-on signal, the free-wheeling diode controls the instantaneous voltage of the cashbox coil (4) to be quickly reduced to be lower than 30 V from higher than 100 V, and the TVS diode reduces the voltage of the cashbox coil to be lower than 15 V after the free-wheeling diode controls the instantaneous voltage of the cashbox coil to be quickly reduced to be lower than 30 V from higher than 100 V. Accordingly, the instantaneous peak voltage of the cashbox anti-jamming circuit can be further reduced to better protect a sensitive display to normally work.

Description

technical field [0001] The invention relates to the field of insurance equipment, in particular to a cash box anti-interference circuit and a circuit anti-interference method. Background technique [0002] In insurance, banking and other financial custody services, cash box equipment is often used to keep money. Among them, the opening or closing of the cash drawer equipment is to generate or eliminate the electromagnetic force by turning on and off the current through the coil, and generate the force of attraction or repulsion to the electromagnet, so as to realize the opening or closing of the cash drawer equipment. However, after the cash drawer coil 4 of the cash drawer is disconnected from the 12V power supply, the internal circuit will oscillate rapidly and generate a high voltage exceeding 100V, which will cause damage to the CPU and display inside the cash drawer. In the prior art, usually in the opening system circuit of the cash drawer, the freewheeling diode 2 is...

AI Technical Summary

Problems solved by technology

However, the circuit using the anti-jamming capacitor 8 has obvious disadvantages. If the capacitance of the anti-jamming capacitor 8 is too small, the peak voltage cannot be reduced to the effect of not interfering with the sensitive display; When opening and closing the cash drawer, the electromagnet of the cash drawer cannot be closed normally after popping out; if a capacitor with a capacitance value in the middle range is selected, the anti-interference capacitor and the cash drawer coil form an LC oscillating circuit. When the circuit is energized, the LC oscillating circuit will appear Violent oscillations, and cause the burnout of the triode 5

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