Positive to Negative Converter

The transformerless dc-dc converter derives a negative supply voltage from a positive. As a bonus, the circuit also generates a clock signal. The negative output voltage tracks the dc-input voltage linearity (a), but its magnitude is about 3 V lower. Application of a 500-W load, (b), causes 10% change from the no-load value.

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Positive to Negative Converter - Circuitos de Electronica