Driving circuit, power circuit and projection device

Abstract

The embodiment of the present application provides a driving circuit, a power circuit and a projection device, which are used for driving an N-MOS tube in a switching power supply circuit, the N-MOS tube is used for controlling on-off of a light source, the driving circuit comprises an energy storage element, a current path connected with the energy storage element and the switching power supply circuit, and configured to charge the energy storage element by using the switching power supply circuit during working of the switching power supply circuit, and a switching circuit, one end of which is connected between the current path and the energy storage element, the other end of which is connected with a gate of the N-MOS tube, and a control end of the switching circuit is connected with the energy storage element, and the switching circuit is configured to drive the N-MOS tube by using a charging voltage of the energy storage element. The driving circuit provided by the embodiment of the present application has simple circuit structure, low design difficulty and low cost, can effectively reduce the circuit area and is beneficial to miniaturization of products, and improves the competitiveness of products.

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