Switch tube driving circuit based on integrated driving chip

Abstract

The invention discloses a switch tube driving circuit based on an integrated driving chip. The switch tube driving circuit comprises the integrated driving chip, an inverter, three diodes, four resistors, two electrolytic capacitors and two switch tubes, wherein a digital PWM (Pulse-Width Modulation) control signal is input at the high side digital signal input end of the integrated driving chip and a low side digital signal input end is connected with the digital PWM control signal through the inverter; the anode of the first diode is connected with a 12V power supply and the cathode of the first diode is connected with the high side output power supply end of the integrated driving chip, furthermore, the high side output power supply end is connected with the high side output grounding terminal of the integrated driving chip through the first electrolytic capacitor, and the anode of the first electrolytic capacitor is connected with the high side output power supply end; and the grid electrode of a second switch tube is connected with a low side driving signal output end through the third resistor, and the source electrode of the second switch tube is connected with the analog ground through the fourth resistor. The driving circuit has small power consumption and a wide duty ratio range, and digital signals are isolated from analog signals.

Description

technical field [0001] The invention belongs to the field of circuit technology, and in particular refers to a high-side power drive circuit for driving a power converter, which is constructed with a MOSFET integrated drive chip. Background technique [0002] Traditional high-side power switch tube drive circuit, one (can be used with figure 1 (shown) is to use the principle of capacitor boosting to connect a power diode between the source of the high-side power switch and the point where there is always voltage to the ground connected to it, so that the source of the high-side power switch is turned off Due to the reverse non-conduction of the diode, it is disconnected from the point where there is always a voltage to the ground, and at the same time, the negative pole of the boost capacitor is directly grounded through a resistor, so as to complete the charging of the boost capacitor. In this way, the connection resistance and power A large amount of energy will be dissip...

AI Technical Summary

Problems solved by technology

[0002] Traditional high-side power switch tube drive circuit, one (can be used with figure 1 (shown) is to use the principle of capacitor boosting to connect a power diode between the source of the high-side power switch and the point where there is always voltage to the ground connected to it, so that the source of the high-side power switch is turned off Due to the reverse non-conduction of the diode, it is disconnected from the point where there is always voltage to the ground, and at the same time, the negative pole of the boost capacitor is directly grounded through a resistor, so as to complete the charging of the boost capacitor. In this way, the connection resistance and power A large amount of energy will be consumed in the diode, resulting in too much power consumption of the drive circuit

The other is to use a transformer to achieve signal isolation and transmission, but since the transformer can only transmit AC signals, when the duty cycle of the control signal PWM is small or large, distortion will occur after transmission through the transformer, so this type of drive circuit Only suitable for applications with a duty cycle around 0.5

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