Resonant switched capacitor direct current voltage converter

Abstract

The invention relates to a resonant switched capacitor direct current voltage converter which comprises a first voltage node, a second voltage node, a first switch, a second switch, a first diode, a second diode and a control circuit, wherein a first voltage exists between the first voltage node and a negative wire; a second voltage exists between the second voltage node and the negative wire; and the control circuit provides switching gate signals for the first and the second switches. The resonant switched capacitor direct current voltage converter further comprises a center-tapped inductor and a resonant capacitor, wherein the center-tapped inductor is connected between the first switch and the second switch; and the resonant capacitor is connected between the common node of the first and the second diodes and the central node of the center-tapped inductor. Compared with the conventional switched capacitor direct current voltage converter, the invention has the advantages of reducing complexity, loss and cost, improving the speed, and avoiding the limitation.

Description

technical field [0001] The invention relates to a resonant switched capacitor DC voltage converter. Background technique [0002] In the field of DC power conversion, a conversion circuit combining switches and capacitors is used to convert different voltages. This type of converter uses capacitors to store electrical energy, and is called a switched capacitor converter (Switched Capacity Converter, SCC). Since this type of converter has no inductor or transformer, it is smaller than other types of converters and can be easily fabricated on an integrated circuit. However, high peak currents typically occur when charging and discharging switched capacitors. Therefore, such converters are usually used in low voltage environments. US Patent Publication No. US20040141345A1 provides a new switched capacitor circuit called a resonant switched capacitor converter (Switched Capacitor Resonant Converter, SCRC), which can work in a high switching frequency and high voltage environm...

AI Technical Summary

Problems solved by technology

[0004] Although SCRC has many advantages, a simple gate drive circuit cannot be applied to this converter, requiring an isolation transformer and / or half-bridge gate drive, thus increasing the complexity of the SCRC

Also, the parasitic inductance in the gate drive transformer limits the drive speed, resulting in more switching losses in high frequency applications

Half-bridge gate drive has limitations for high-frequency operation and increased converter cost

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