Obtaining doubled bipolar voltages in a converter based on ICL7660 series microcircuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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Specialized microcircuits of the 7660 series, designed to build voltage converters on switched capacitors, have been known for a long time and are most often used in low-power power supplies to convert the voltage polarity (from positive to negative). Such microcircuits are produced by different manufacturers, including domestic ones (KR1168EP1), and with different names. The most common microcircuits are the ICL7660 series from Intersil [1]. The main advantages of the voltage converter on this chip, according to the author, are:
- high efficiency at low load currents (up to tens of milliamps);
- low own consumption current (tens of microamperes);
- no storage choke.
Chokes have already become a "classic" in voltage converters, but often their use reduces the efficiency of converters, especially low-power converters, in addition, a suitable choke is not always available and its manufacture is required. Therefore, low-power converters on switched capacitors in some cases may have an advantage [2].
Schemes for building a converter on 7660 series microcircuits are given in the descriptions from manufacturers (datasheets), for example, in [1]. Unfortunately, there was no circuit solution for a converter with doubled in relation to the input and bipolar output voltages without the use of another (additional) microcircuit and two capacitors. However, the use of an additional microcircuit is inexpedient from a financial point of view.
Rice. 1. Modified converter circuit
After analyzing the principle of operation of the converter on a single 7660 microcircuit, it turned out that it is possible to obtain from it not only a double output voltage of positive polarity, but also a double negative one without the use of an additional microcircuit. The modified converter circuit is shown in the figure. The channel with a doubled output voltage of negative polarity (-2Up) is highlighted in red. With the input voltage range of the converter indicated on the diagram from 1,5 to 8 V, voltages of ± 1,5 ... 8 V and + 3 ... 16 V are obtained at the outputs, respectively.
It should be noted that all the parameters and recommendations of manufacturers, for example, in [1], regarding the choice of the element base (diodes and capacitors) are also valid for the circuit solution shown in the figure. Features of the choice of rectifier diodes to increase the efficiency of the converter at low load currents, taking into account their capacitance and allowable reverse current, were given in [2].
Literature
- ICL7660S, ICL7660A Super Voltage Converters. - URL: intersil.com/content/dam/Intersil/documents/icl7/icl7660s-a.pdf.
- Glibin S. Power supply of the M-832 multimeter from two batteries. - Radio, 2014, No. 6, p. 21, 22.
Author: S. Glibin
See other articles Section Voltage converters, rectifiers, inverters.
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