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A hand-made diode bridge. The silver band on the diodes indicates the cathode side of the diode.. A diode bridge is a bridge rectifier circuit of four diodes that is used in the process of converting alternating current (AC) from the input terminals to direct current (DC, i.e. fixed polarity) on the output terminals.
The best-known bridge circuit, the Wheatstone bridge, was invented by Samuel Hunter Christie and popularized by Charles Wheatstone, and is used for measuring resistance. It is constructed from four resistors, two of known values R 1 and R 3 (see diagram), one whose resistance is to be determined R x, and one which is variable and calibrated R 2.
Examples of broadly available topologies implemented in modules are: switch (MOSFET, IGBT), with antiparallel Diode; bridge rectifier containing four (1-phase) or six (3-phase) diodes; half bridge [1] (inverter leg, with two switches and their corresponding antiparallel diodes) H-Bridge (four switches and the corresponding antiparallel diodes)
Also called CLDs, constant-current diodes, diode-connected transistors, or current-regulating diodes. Crystal rectifiers or crystal diodes These are point-contact diodes. [27] The 1N21 series and others are used in mixer and detector applications in radar and microwave receivers. [24] [25] [26] The 1N34A is another example of a crystal diode. [38]
If the input voltage continues increasing and exceeds the base-emitter breakdown voltage, the base-emitter junction of the transistor driven by the lower input voltage breaks down. If the input sources are low resistive, an unlimited current will flow directly through the "diode bridge" between the two input sources and will damage them.
The voltage drop V F across the forward-biased diode in the circuit of a passive rectifier is undesired. In this active version, the problem is solved by connecting the diode in the negative feedback loop. The op-amp compares the output voltage across the load with the input voltage and increases its own output voltage with the value of V F.
By the way, this circuit has other uses. For instance, if you can stand the extra diode drop, a diode bridge is a way to build a circuit that does not care which way the battery is connected, so it is sometimes used even when AC is not involved. Also, diode bridge configurations are used in switches and modulators. AJim 16:57, 12 Mar 2004 (UTC)
Each input of a diode logic gate connects through a diode connected to a shared wired logic output. Depending on the voltage level of each input and direction of the diode, each diode may or may not be forward-biased. If any are forward-biased, the shared output wire will be one small forward voltage drop within the forward-biased diode's input.