Graetz Bridge - definition
Graetz Bridge - definition
Graetz bridge is a rectifier circuit consisting of four Diodes connected in a configuration that allows an alternating input voltage to be converted to a DC voltage. It works on the principle of double-voltage rectification, which means that both the positive and negative halves of a sinusoidal voltage are used to generate a voltage with a uniform direction. The circuit is named after Leopold Graetz, who described the design in the first Decades of the 20th century.
The primary function of the Graetz bridge is to convert an AC voltage into a pulsating DC voltage, which is widely used in electronic power supplies. Due to its configuration, the circuit provides greater efficiency than single-voltage rectifiers, as it does not allow any interruption of current flow through the load during each full phase of the mains voltage. During each half of the AC cycle, two of the four Diodes are conducting and the Others are negatively polarised, ensuring unidirectional current flow through the load.
Due to its simplicity of construction and low implementation cost, the Graetz bridge is commonly used in power supply circuits for electronic devices, electric actuators, chargers and power electronics systems. To improve the quality of the output voltage, additional filter capacitors are often used to smooth out pulsations and bring the output voltage closer to a constant value. In applications requiring higher precision or lower ripple, further voltage stabilisation or conversion steps are used.
The operating characteristics of a Graetz bridge depend on the parameters of the diodes used, such as the conduction voltage, rated current and switching time. Nowadays, these circuits can be realised as off-the-shelf integrated circuits, which simplifies the design of power supply circuits in electronic and industrial projects.
Transfer Multisort Elektronik (TME) is one of the world’s largest global distributors of electronic components, electrotechnical parts, workshop equipment, and industrial automation. The catalog includes over 1,500,000 products from 1,300 leading manufacturers. TME’s modern logistics centers in Łódź and Rzgów (Poland), with a combined area of over 40,000 m², ship nearly 6,000 packages daily to customers in more than 150 countries.
TME also invests in the development of knowledge and skills of young engineers and electronics enthusiasts through the TME Education project, and supports the tech community by organizing the TechMasterEvent series, promoting innovation and experience exchange.
