Transformerless voltage doubler for small devices, 100 milliamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The figure shows a diagram of a voltage converter 9 V -> 18V for devices that consume no more than 100 mA at a supply voltage of 18 volts. The converter is included in the practical siren circuit for security and alarm systems.
(click to enlarge)
The control generator is made according to a typical scheme. At the output of D1.2, rectangular pulses are formed with a frequency of 1 Hz. The pulses are fed to the controlled generator Dl.3, D1.4 and a chain of R3, R2, C2, which affects the modulation depth. R4, R5, C3, C4 are selected in accordance with the resonant frequency of the piezoceramic emitter B 1 within 1,5-3 kHz. To increase the amplitude on the piezocrystal, a multiplier is introduced into the circuit. The signal from the output DD1.4 goes to the complementary pair VT5, VT6 and then to the multiplier VD3, VD4, C5, Sat. The voltage at C6 with a load current of 50 mA and a main supply of 9 V is about 16 V.
The power of the multiplier can be slightly increased by using larger capacitances. The circuit can be powered with 6-15V (15V maximum for 561 series ICs), in case of 15V supply, the voltage at the output of the multiplier will be less than 25V at 80mA load.
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