Adaptive current source drive circuit

Abstract

Disclosed is an adaptive current source drive circuit, comprising a current source drive circuit and a voltage adjusting circuit, wherein the voltage adjusting circuit feeds back the parameter change by acquiring a main circuit, obtains a reference voltage, and dynamically adjusts the driving circuit of the current source drive circuit, thus realizing adaptive current source driving. According to the circuit structure, the high frequency driving loss and the switch loss is reduced, and the system efficiency is optimized within the wide load scope.

Description

technical field [0001] The invention belongs to the technical field of power device drive circuits. Background technique [0002] With the rapid development of power electronics technology, the power supply is developing towards high power density and high efficiency. The operating frequency of traditional low-power converters is generally hundreds of kilohertz. The passive components of the converter (such as capacitors and inductors) are relatively large, the dynamic response is slow, and the volume and weight are large, which directly reduces the power density of the converter. Therefore, high-frequency converters and high power density are the development trend of low-power converters. As a bridge between the signal circuit and the main power circuit, the rationality and correct design of the drive circuit have an important impact on the entire converter system. [0003] Figure 1(a) , (b) Given the traditional voltage source driver (Voltage Source Drivers) method, the...

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Problems solved by technology

[0003]Figure 1(a) and (b) show the traditional voltage source driver (Voltage Source Drivers) mode, which has two shortcomings: 1) Since the drive circuit is charged and discharged in RC mode, it can effectively drive The current will decrease with the change of the gate drive voltage, which increases the switching time and switching loss. The parasitic inductance (line inductance, package inductance) in the driving circuit will further reduce the effective driving current and increase the switching time and loss. ; 2) The energy stored on the MOSFET gate capacitance is consumed during the switching process, and this driving loss is proportional to the switching frequency

At the same time, due to the constant current characteristic of the constant current source, the leakage inductance of the driving circuit is absorbed, which further accelerates the switching speed of the power MOSFET and reduces the switching loss, and the switching loss is often the main frequency loss of the high frequency hard switching power converter

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