Electronic Bridges Information

Electronic bridgeElectronic bridges are used to cross from one circuit, channel, board, or element over to another. An electronic bridge is used to measure various parameters like:

  • inductance
  • capacitance
  • admittance
  • conductance
  • impedance

Types

There are many types of electronic bridges. Examples include a Wheatstone circuit bridge, an H circuit bridge, and a network bridge.

  • Wheatstone circuit bridges are electrical bridge circuits that are used to measure resistance. Wheatstone circuit bridges consist of a common electric current source such as a battery and a galvanometer, which connects two parallel branches, containing four resistors and the values of three resistors are known.
  • An H circuit bridge has the capability to drive the motor forward or backward at any speed. An H circuit bridge can optionally use a completely independent power source.
  • A network bridge is an inexpensive method to connect LAN segments. Other electronic bridges are commonly available.

Features

There are several ways in which electronic bridges function. Electric bridges are employed for interfacing transducers and helping to measure impedance at high frequencies. Wheatstone circuit bridges are suitable for measuring any small change in resistance. Wheatstone circuit bridges consist of two parallel branches where one branch contains a known resistance and an unknown resistance, while the other parallel branch contains resistors of known values. This circuit measures the value of the unknown resistor by adjusting the values of the other three resistances until the current passing through the galvanometer decreases to zero. In an H circuit bridge, a condition called "shoot through" exists where there is a path between the positive and the negative sides of the H bridge that can make semiconductors ballistic. A network bridge is a type of electric bridge that connects two sides of adjacent networks. A network bridge is also called a network switch. Electronic bridges are designed and manufactured to meet most industry specifications.

Applications

Electronic bridges are used in many applications. Some examples include measurement of impedance, capacitance, conductance, and very high and very low resistance. Electronic bridges should adhere to Institute of Electrical and Electronics Engineers (IEEE).

Related Information

CR4 Community—Basic Variable Speed Motor/Switch

Electronics360—The Wheatstone Bridge: Still the Preferred Sensor-Interface Topology After 180 Years

Electronics360—Design Notebook: Linearization of a Wheatstone Bridge

Image credit:

Voltage Multipliers, Inc.