Boost power converter system and boost method
A power converter and power switch technology, applied in the direction of converting DC power input to DC power output, output power conversion device, conversion equipment without intermediate conversion to AC, etc., can solve the problem of reducing converter efficiency, wasting power, occupying chip area and other issues
Active Publication Date: 2015-04-15
FAIRCHILD SEMICON SUZHOU +1
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Problems solved by technology
However, in the case of integrated solutions, this approach requires relatively large capacitors, thus occupying a lot of chip area, or in the case of discrete component solutions, this approach requires additional external components
Another approach is to use active damping (i.e., low-side damped switch) between the converter switch node and ground, but this approach wastes power and reduces converter efficiency
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[0015] In summary, the present application provides a boost power converter operating in discontinuous conduction mode (DCM) with high side active damping to reduce circulating current and increase converter stability and efficiency. Advantageously, the boost power converter of the present application can achieve critical damping of oscillations, since by using high-side active damping, the adverse impact on converter efficiency that existing solutions have is avoided.
[0016] A boost power converter is a type of switched-mode power supply and typically includes a power switch, a rectifier, and a filter; the filter further includes an inductor-capacitor network. Under the control of the drive circuit, the power switches are opened and closed to generate a pulse train whose pulse width or pulse frequency is modulated to control the converter, eg, in response to varying output load conditions. A rectifier and filter convert the pulse train to a DC output voltage. During some ...
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A boost power converter system according to one embodiment includes an input voltage high-side node; an inductor coupled to the input voltage high-side node at a first terminal of the inductor; a power switch coupled to the inductor at a second terminal of the inductor; a drive circuit configured to control the power switch such that the boost power converter system operates in a discontinuous conduction mode when a load current drops below a critical conduction threshold; and a damping switch configured to enable current flow from the power switch at the second terminal of the inductor to the input voltage high-side node, wherein the damping switch is closed when the power switch is open and the damping switch is opened when the power switch is closed.
Description
technical field [0001] The present application relates to a boost power converter system and boost method, and more particularly, to a boost power converter with high side active damping in discontinuous conduction mode. Background technique [0002] A boost power converter is a type of switching mode power supply that converts an input direct current (DC) voltage to a higher output DC voltage of the same polarity. The boost power converter can operate in discontinuous conduction mode, where the current through the inductor is zero for a portion of the switching cycle. When the current of the inductor reaches zero, the power converter will generate a ring or oscillation due to the influence of the parasitic capacitance in the power switch and the rectifier diode. This circulating current makes the control loop of the converter unstable and reduces the conversion efficiency. Furthermore, when the boost converter is used for active power factor correction, this circulating c...
Claims
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IPC IPC(8): H02M3/10
CPCH02M3/158H02J1/02
Inventor R·霍洛韦A·翁格H·侯
Owner FAIRCHILD SEMICON SUZHOU