A locking mechanism unlocking control circuit

Abstract

The invention belongs to an unlocking control circuit and particularly discloses an unlocking control circuit for a locking mechanism. The output end of a DSP is communicated with the input end of a control circuit, and the output end of the control circuit is communicated with the control input end of a locking circuit. One output end of the locking circuit is communicated with one input end of a circuit to be unlocked, and the other output end of the locking circuit is communicated with the other input end of the circuit to be unlocked and input end of a detection circuit. The feedback output end of the detection circuit is communicated with the input end of the DSP. The DSP sends a control instruction to the control circuit, the control circuit reverses the control instruction and then transmits the control instruction to the locking circuit, the locking circuit carries out filtering and optocoupler isolation for the reversed control instruction and then transmits the control instruction to the circuit to be unlocked and the detection circuit, the detection circuit collects the state of the circuit to be unlocked and transmits to the DSP in real time, and the DSP determines the locking state of the circuit to be unlocked. The circuit can isolate load from a power supply so as to prevent an electromagnetic lock from being burnt, and can provide a stable supply voltage to the electromagnetic lock.

Description

technical field [0001] The invention belongs to an unlocking control circuit, in particular to an unlocking control circuit of a highly reliable locking mechanism. Background technique [0002] There are usually two ways in the unlocking circuit in the past: the first is the power supply resistor voltage division method; the second is the chopper voltage division method. But both methods have their own shortcomings. [0003] The power supply resistor divider method is to divide the battery voltage through the resistor, and then supply it to the electromagnetic lock. This method dissipates most of the electric energy, is inefficient, and generates serious heat. At the same time, as the power supply voltage drops, the power supply voltage of the electromagnetic lock will also drop, and the reliability will also decrease; and the circuit does not have an isolation function. expected serious consequences. [0004] The chopping and voltage dividing method uses the control chi...

AI Technical Summary

Problems solved by technology

Once the PWM signal control is abnormal, the serious consequences of abnormal power supply voltage, MOS tube burnout or electromagnetic lock burnout will also occur

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