Bipolar dc-dc converter requires no inductor

Inverters Ula and Ulb form a 20-kilohertz oscillator whose square wave output-further shaped by D2, R4, and R5 and by D3, R6, and R7—drives power field-effect transistors Q2 and Q3. The p-channel and n-channel FETs conduct alternately, in al push-pull configuration. When Q2 conducts, the positive charge on Cout forces diode D4 to conduct as well, which produces a positive voltage, determined by zener diode D5, at terminal A.
Bipolar dc-dc converter requires no inductor - schematic

Similarly, when Q3, in its turn conducts, the negative charge on Cout forces D7 to do so as well. A negative voltage, therefore, develops at terminal B, whose level is set by D6.

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