Delay switching circuit for inhibiting electrifying pulse current

Abstract

The invention provides a delay switching circuit for inhibiting electrifying pulse current. The delay switching circuit delays the breakover of a second switching tube through a switch delay time timing network which consists of a second resistor and a second capacitor; and when the second switching tube is switched on, a first capacitor is charged, then a first switching tube is switched on, and a battery starts to supply electricity to a main circuit. The first switching tube is connected to a main power supply loop to serve as a delay switch; when power is on, the delay switch delays a certain period of time, and then connects a power supply with the main power supply loop; the switch on of the delay switch takes variable resistance transition time from big resistance to small resistance; and the instant electrifying pulse current is effectively inhibited in time by double action of delay and variable resistance switch on, so that the aims of eliminating striking fire of battery pole pieces and reducing the electromagnetic interference of instant electrifying are fulfilled.

Description

A Delay Switch Circuit for Suppressing Power-on Pulse Current technical field The invention relates to the technical field of switch circuits, in particular to a delay switch circuit for suppressing power-on pulse current. Background technique The power supply circuit of handheld devices generally has capacitors with a certain capacity. At the moment of power-on, the power supply will charge these capacitors, thereby generating a large pulse current. The large pulse current at the moment of power-on will bring two problems: one is that when the contact of the battery pole piece is unstable, these large pulse currents will generate high heat at the contact part of the battery pole piece, and the battery will be damaged. Pole piece is partially melted. At the same time, the air around the molten battery pole piece expands rapidly to produce an explosion, and the explosive airflow brings the molten metal liquid to the surrounding air, causing sparks to splash. The second i...

AI Technical Summary

Problems solved by technology

The large pulse current at the moment of power-on will bring two problems: one is that when the contact of the battery pole piece is unstable, these large pulse currents will generate high heat at the contact part of the battery pole piece, and the battery will be damaged. Partial melting of pole piece

Second, the pulsed large current generated by instantaneous charging will bring strong electromagnetic interference to the surrounding space.

Since the current needs to be collected in this circuit, then converted into a sampling voltage, and then the first switching tube is controlled through the sampling voltage, there is a delay in the current feedback control process, and the suppression effect on the sudden large pulse current generated when the power is turned on is not obvious, and Connecting the current sampling resistor in series in the main power supply circuit will cause loss, thereby reducing the utilization efficiency of the battery

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