Boosted circuit

Abstract

The invention discloses a voltage booster circuit, reduces the spurious inductance and the parasitic capacitance of a circuit, and reduces the power consumption of the circuit. The voltage booster circuit comprises a switch, wherein the switch is an N-type MOS tube; a pulse signal which controls the opening and the closing of the switch is input to a grid of the MOS tube; a source electrode of the MOS tube is earthed; a drain electrode outputs a switching signal of the voltage booster circuit; the source electrode and the drain electrode of the MOS tube are respectively connected with two ends of a noise suppression capacitance. The invention can be widely applied to consumption electronic products.

Description

technical field [0001] The invention relates to a voltage boosting circuit, in particular to a voltage boosting circuit for protecting a freewheeling diode from the instantaneous overshoot voltage of a switch signal. Background technique [0002] In the design of many consumer electronics products, power supply design is often the difficulty of design, and efficient, stable and reliable power supply scheme design has always been the pursuit goal of technicians and researchers. With the increasingly fierce competition of consumer electronics products, low-cost and high-performance power supply designs are increasingly favored by manufacturers. [0003] As the power supply of consumer electronic products, the booster circuit currently has two main solutions. The first is to use a dedicated booster circuit chip, and the second is to use resistance capacitance and transistors to build a dedicated booster circuit according to specific applications. The performance of the boost c...

AI Technical Summary

Problems solved by technology

[0006] The boost circuit based on the basic structure shown in Figure 1, its structure and function make the triode used as the switch of the boost circuit inevitably generate large parasitic inductance and parasitic capacitance, and the power consumption of the entire boost circuit is relatively large

In addition, no matter whether a dedicated boost circuit chip is used, or a dedicated boost circuit is built using RC and transistors, the existing boost circuits are not suitable for some demanding applications, such as set-top boxes, digital TVs, etc.

One of the reasons is that due to the large switching noise, it will greatly affect the equipment parameter indicators, such as key technical parameters such as sensitivity and signal-to-noise ratio.

During the actual debugging process, it was found that these parameters are very sensitive to the noise of the switching power supply. If they are not handled properly, the product performance and application capabilities will be greatly reduced.

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