It also enables the use of PWM switching to control the current level.Ī solid-state H-bridge is typically constructed using opposite polarity devices, such as PNP bipolar junction transistors (BJT) or P-channel MOSFETs connected to the high voltage bus and NPN BJTs or N-channel MOSFETs connected to the low voltage bus. This can extend the relay life, as the relay will be switched while the transistor is off and thereby there is no current flow. However a semiconductor-based H-bridge would be preferable to the relay where a smaller physical size, high speed switching, or low driving voltage (or low driving power) is needed, or where the wearing out of mechanical parts is undesirable.Īnother configuration is to have a DPDT relay to set the direction of current flow and a transistor to enable the current flow. Ī " double pole double throw" (DPDT) relay can generally achieve the same electrical functionality as an H-bridge (considering the usual function of the device). One way to build an H-bridge is to use an array of relays from a relay board.
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