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See also: Before the development of power semiconductors and allied technologies, one way to convert the voltage of a DC supply to a higher voltage, for low-power applications, was to convert it to AC by using a, followed by a step-up. For higher power an electric motor was used to drive a generator of the desired voltage (sometimes combined into a single 'dynamotor' unit, a motor and generator combined into one unit, with one winding driving the motor and the other generating the output voltage). These were relatively inefficient and expensive procedures used only when there was no alternative, as to power a car radio (which then used thermionic valves/tubes requiring much higher voltages than available from a 6 or 12 V car battery). The introduction of power semiconductors and integrated circuits made it economically viable to use techniques as described below, for example to convert the DC power supply to high-frequency AC, use a transformer—small, light, and cheap due to the high frequency—to change the voltage, and rectify back to DC. Although by 1976 transistor car radio receivers did not require high voltages, some operators continued to use vibrator supplies and dynamotors for mobile requiring high voltages, although transistorised power supplies were available. While it was possible to derive a lower voltage from a higher with a linear electronic circuit, or even a resistor, these methods dissipated the excess as heat; energy-efficient conversion only became possible with solid-state switch-mode circuits.

Grid interface converter, bidirectional converters, noninverted buck–boost dc/dc converter, plug-in hybrid electric vehicles (PHEVs), vehicle-to-grid (V2G). NOMENCLATURE V s Alternating current (AC) grid voltage. L 1 Alternating current/direct current (AC/DC)–DC/AC converter inductor. T 16 AC/DC–DC/AC converter insulated gate bipolar.

See also: DC to DC converters are used in portable electronic devices such as and, which are supplied with power from primarily. Such electronic devices often contain several sub-, each with its own voltage level requirement different from that supplied by the battery or an external supply (sometimes higher or lower than the supply voltage). Additionally, the battery voltage declines as its stored energy is drained. Switched DC to DC converters offer a method to increase voltage from a partially lowered battery voltage thereby saving space instead of using multiple batteries to accomplish the same thing. Most DC to DC converter circuits also regulate the output voltage. Some exceptions include high-efficiency, which are a kind of DC to DC converter that regulates the current through the LEDs, and simple which double or triple the output voltage. DC to DC converters developed to maximize the energy harvest for and for are called.

Transformers used for voltage conversion at mains frequencies of 50–60 Hz must be large and heavy for powers exceeding a few watts. This makes them expensive, and they are subject to energy losses in their windings and due to eddy currents in their cores.