Will the flyback diode circuit formed when the relay opens damage the power supply? 1

Date:2026-01-05 Categories:Product knowledge Hits:271 From:Guangdong Youfeng Microelectronics Co., Ltd


A relay is an electronic device that primarily controls larger currents or voltages by inputting smaller currents or voltages into a circuit. This device mainly consists of an electromagnet coil, a switch, and a spring. When current flows through the coil, it generates a magnetic field, which attracts the switch and closes it. This allows larger currents or voltages to flow through the switch. When the current stops, the spring pushes the switch back to its original position, breaking the circuit.diode

First, let's understand the working principle of a freewheeling diode. When the relay is turned off, the current in the inductive component generates magnetic field energy. When the switch is opened, the current in the inductive component drops instantaneously, and the magnetic field energy needs to be released. During this process, a reverse voltage is generated between the two terminals of the inductive component, also known as back EMF.diode

A freewheeling diode, also known as a flywheel diode, is an electronic component used to protect other parts of a circuit from the effects of reverse voltage spikes. When an inductive element (such as a relay) in a circuit is suddenly disconnected, it generates a reverse voltage spike. Without a freewheeling diode, this reverse voltage could damage other components in the circuit. The freewheeling diode protects the circuit by allowing current to flow freely in one direction, thereby eliminating the reverse voltage.diode



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