High-voltage gate driving circuit with shared input capacitor

Abstract

The invention discloses a high-voltage gate driving circuit with a shared input capacitor. The circuit comprises a chip and a peripheral circuit; the chip comprises a voltage-stabilizing circuit and adriving circuit; the peripheral circuit comprises a load and other peripheries; the driving circuit is connected with the VDD pin of the voltage-stabilizing circuit; one end of a CVDD capacitor is connected between the voltage-stabilizing circuit and the driving circuit; the driving circuit is connected with a pulse signal, and connected with the gate of a driving switch tube M0 through driving pulse; the source of the driving switch tube M0 is grounded, and the drain of the switching tube M0 is connected with the input voltage through the load and other peripheries; the input voltage is grounded together with the load and other peripheries through the driving circuit; the input voltage and the driving circuit are grounded through the voltage-stabilizing circuit; and the input voltage andthe voltage-stabilizing circuit are grounded through an input high-voltage capacitor. Compared with the prior art, the external capacitor CVIN is shared in the high-voltage gate driving circuit, so that an external low-voltage bypass capacitor CVDD is omitted, thereby reducing the chip area and lowering the cost.

Description

technical field [0001] The invention belongs to the field of switching power supplies, and in particular relates to a high-voltage gate drive circuit sharing an input capacitor. Background technique [0002] Because the switching power supply circuit has the characteristics of high efficiency, most of the power supplies on the market are switching power supplies. However, in the switching power supply circuit, since the driving current of the driving circuit is as high as hundreds of milliamps or even several amps at the moment when the switch tube is turned on, the power supply for the drive circuit needs a capacitor to provide driving energy at the moment the switch tube is turned on. Therefore, the power supply will not fluctuate greatly, avoiding the occurrence of misoperation and false triggering of the circuit, and ensuring the stability and reliability of the switching power supply. Due to the use of capacitors, the purchase cost and production cost of the entire sys...

AI Technical Summary

Problems solved by technology

The other one needs to increase the chip area to obtain the default of the peripheral bypass capacitor, and the input voltage VIN is also limited to a lower voltage, which limits the application range

[0004] The disadvantage of the traditional technology is: due to the increase in the cost of external capacitors and production costs, or the increase in chip area costs, the cost of the entire system has increased, and the scope of application has been limited, thereby reducing the competitiveness of the market

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