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A Zero Volt Switching Boost Converter to achieve high density with high efficiency while operating at a high frequency

IP.com Disclosure Number: IPCOM000229470D
Publication Date: 2013-Jul-31
Document File: 2 page(s) / 30K

Publishing Venue

The IP.com Prior Art Database

Abstract

A zero volt switching boost converter to achieve high density with high efficiency while operating at a high frequency is disclosed.

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A Zero Volt Switching Boost Converter to achieve high density with high efficiency while operating at a high frequency

Disclosed is a zero volt switching boost converter to achieve high density with high efficiency while operating at a high frequency.

Existing boost stage regulators present switching losses during turn on and turn off of the switching devices and therefore limited to operating at lower frequency.

Instead the boost regulator is operated in a mode so that there is no overlap of voltage and current in the semiconductor devices used. If the regulator has zero volt switching losses, the operation is possible at Mhz frequency. A high frequency operation is useful for small size of the regulator. Absence of switching loss achieves very high efficiency.

Figure 1 depicts an example implementation of the boost regulator. In this example, a boost regulator being fed by a DC source voltage of 200V. C3 is an input filter capacitor. L1 is the Boost inductor. Q3 is the boost MOSFET. D1 is the boost diode. C2 is the output filter capacitor. The boost converter operates at a fixed duty cycle to provide an output voltage that tracks the input DC voltage. For example if the input voltage is pre-regulated to 200V, the output of the boost regulator will be 400V DC at 50% duty ratio.

Figure 1

The waveforms in Figure 2 below illustrate the operation of a zero volt switching boost regulator shown in Figure 1.

Figure 2

In Figure 2, MOSFET Q3 is turned on when the voltag...