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#Switch to converter portable
While it was possible to derive a lower voltage from a higher with a linear regulator or even a resistor, these methods dissipated the excess as heat energy-efficient conversion only became possible with solid-state switch-mode circuits.ĭC-to-DC converters are used in portable electronic devices such as cellular phones and laptop computers, which are supplied with power from batteries primarily. Although by 1976 transistor car radio receivers did not require high voltages, some amateur radio operators continued to use vibrator supplies and dynamotors for mobile transceivers requiring high voltages although transistorized power supplies were available. For example, first is converting the DC power supply to high-frequency AC as an input of a transformer - it is small, light, and cheap due to the high frequency - that changes the voltage which gets rectified back to DC. The introduction of power semiconductors and integrated circuits made it economically viable by use of techniques described below.
#Switch to converter generator
(The motor and generator could be separate devices, or they could be combined into a single "dynamotor" unit with no external power shaft.) These relatively inefficient and expensive designs were used only when there was no alternative, as to power a car radio (which then used thermionic valves (tubes) that require much higher voltages than available from a 6 or 12 V car battery). Where higher power was needed, a motor–generator unit was often used, in which an electric motor drove a generator that produced the desired voltage. of Employees 5-50 People (362) 51-200 People (215) 201-500 People (46) Less than 5 People (36) 501-1000 People (16) Above 1000 People (2) More Province & Region Guangdong (372) Zhejiang (236) Jiangsu (174) Shandong (148) Shanghai (81) Henan (44) Hebei (43) Fujian (40) Hubei (34) Anhui (32) Beijing (14) Hunan (13) Liaoning (12) Shaanxi (11) Sichuan (9) Chongqing (9) Tianjin (8) Jiangxi (6) Guangxi (4) Gansu (1) Yunnan (1) Shanxi (1) Hongkong S.A.R.Before the development of power semiconductors, 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 vibrator, then by a step-up transformer, and finally a rectifier.