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Research on spike absorption circuit based on switching 18650 lithium ion battery cell
A switching 18650 lithium ion battery cell is a 18650 lithium ion battery cell that uses modern power electronics technology to control the turn-on and turn-off time ratio of the switch tube to maintain a stable output voltage. The switching 18650 lithium ion battery cell is generally composed of a pulse width modulation (PWM) control IC and a MOSFET.
With the development and innovation of power electronics technology, switching 18650 lithium ion battery cell technology is also constantly innovating. At present, switching 18650 lithium ion battery cell is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable 18650 lithium ion battery cell method for the rapid development of today's electronic information industry.
Through the control circuit, the electronic switching device is continuously turned on and off, allowing the electronic switching device to pulse modulate the input voltage, thereby achieving DC/AC, DC/DC voltage conversion, as well as adjustable output voltage and automatic voltage stabilization.
A switching 18650 lithium ion battery cell is a 18650 lithium ion battery cell that uses modern power electronics technology to control the turn-on and turn-off time ratio of the switching tube to maintain a stable output voltage. The switching 18650 lithium ion battery cell is generally composed of a pulse width modulation (PWM) control IC and a MOSFET). High-speed switching in the system The distributed inductance and capacitance present in the circuit generate surge voltage and noise under the influence of the accumulated charge in the diode. This paper uses an RC or LC absorption circuit to magnetically absorb the surge voltage generated by the accumulated charge in the diode, using amorphous magnetic cores and rectangular magnetic cores, thereby solving the problem of generating and suppressing surge currents in switching power supplies.
Most of the main components of a switching 18650 lithium ion battery cell have parasitic inductance and capacitance. The parasitic capacitance Cp is usually connected in parallel with the switching element or diode, and the parasitic inductance L is usually connected in series with it. Due to the effects of these parasitic capacitances and inductances, switching elements often generate large voltage surges and current surges when they are switching on and off.
Both the switching of the switch and the reverse recovery of the diode will produce large current surges and voltage surges. The most effective way to suppress the current surge when the switch is turned on is to use a zero-voltage switching circuit. On the other hand, the voltage surge from the switch opening and the voltage surge from the diode reverse recovery may damage the semiconductor components and be the cause of noise. For this reason, a snubber circuit is required when the switch is open. During diode reverse recovery, the voltage surge generation mechanism is the same as when the switch is turned off. Therefore, this absorption circuit is also suitable for diode circuits. This article introduces RC, RCD, LC and other absorption circuits. The basic working principle of these absorption circuits is to provide a bypass for the switch when the switch is turned off to absorb the energy accumulated in the parasitic inductance and clamp the switch voltage, thereby Suppress inrush current.
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