Switched-Mode Power Supply Generating Arbitrary Load Voltages

The power supply is segmented into two independent half-bridge circuits, each capable of generating positive or negative voltage. The first half-bridge generates a first output voltage and the second half-bridge generates a second output voltage, with the load voltage being the difference between these two voltages. This segmentation allows independent control of positive and negative voltage generation, enabling arbitrary load voltage waveforms while maintaining modular simplicity.

Each half-bridge circuit serves multiple functions: it can generate positive voltage, negative voltage, and provide energy storage through its output capacitor. The transformer serves both as an energy transfer medium and as a means to generate differential voltages. This multi-functionality reduces the need for separate dedicated circuits for each function, achieving versatility without proportional increases in complexity.

The harmful current ripple is extracted and redirected through the load. Since the load voltage is the differential voltage between two output voltages, the ripple currents from both half-bridges flow through the load rather than appearing as output ripple. This extracts the ripple from the output and utilizes it productively, stabilizing the output current while maintaining straightforward half-bridge design.

The switching ripple that would normally be harmful is converted into a beneficial feature by using differential voltage. The ripple currents generated by the switching action in each half-bridge are transformed into useful load current through the differential relationship, turning what would be noise into productive current flow through the load.

The dual half-bridge configuration enables continuous energy transfer to the load. While one half-bridge is in its dead time period, the other half-bridge continues to transfer energy, ensuring uninterrupted power delivery. This continuity eliminates gaps in energy transfer that would otherwise occur in single half-bridge designs, significantly improving efficiency without requiring complex energy storage elements.

The two half-bridges operate in complementary periodic cycles with dead time coordination. When one half-bridge is switching, the other is in its dead time, and vice versa. This periodic alternation ensures that energy transfer continues without interruption, as one bridge picks up the slack when the other is in its non-conducting period, maintaining continuous useful action.