Three forms of DC bridges. What are the similarities and differences between AC bridges and DC bridges?
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Three forms of DC bridges. What are the similarities and differences between AC bridges and DC bridges?

Posted Date: 2024-02-06

What is a DC bridge

A DC bridge is an electronic measuring instrument mainly used to measure resistance. It uses the bridge balance principle to measure the resistance value to be measured. There are two types of DC bridges: single bridge and double bridge. The former is often called the Wheatstone bridge and is used for median resistance measurement in the range of 1 to 106Ω; the latter is often called the Kelvin bridge and is used in the range of 0.00 to 1Ω. low value resistance measurement.

Three forms of DC bridges

A DC bridge is a circuit used to measure resistance or detect changes in circuit parameters. According to its purpose and configuration, it can be divided into the following three forms:

1. Whetstone Bridge: The Whetstone bridge is one of the most common forms of DC bridges and is also called a four-resistance bridge. It consists of four resistors and an ammeter for measurement. A Wheatstone bridge balances the measuring bridge by adjusting the value of one of the resistors to determine the value of the unknown resistor. This type of bridge is widely used in resistance measurements.

2. Schering Bridge: Schering Bridge is a DC bridge used to measure capacitor parameters. It consists of four capacitors and an AC power supply, and the frequency and capacitance value are adjusted to balance the bridge. The Skeins bridge is commonly used to measure capacitive properties such as dielectric constant and dissipation factor.

3. Kelvin Bridge: The Kelvin Bridge is a DC bridge used to measure low resistance and inductance. It consists of two resistors and two inductors, and the bridge balance is achieved by adjusting the resistance value and frequency. Kollmorgen bridges are often used to test components with small resistance values ​​or high inductance properties.

These DC bridge forms are based on basic bridge circuit principles and use bridge balance conditions to measure parameters such as resistance, capacitance or inductance. They can provide high-precision measurement results in practical applications and are widely used in electronics, electrical engineering and scientific research fields.

What are the similarities and differences between AC bridge and DC bridge?

AC bridges and DC bridges are two different types of electronic circuits, and they have some significant differences in their applications and working principles. The following are the similarities and differences between them:

Same point:

1. Both are bridge circuit structures that use four electronic devices (usually diodes or transistors) to implement circuit functions.

2. Both can realize voltage rectification, resistance measurement and other specific applications.

difference:

1. Power supply type:

- AC bridges are commonly used in AC power systems to control and rectify AC signals.

- The DC bridge is mainly used in DC power supply systems to regulate and control DC signals.

2. Working principle:

- AC bridges usually involve phase difference and rectification of AC signals, such as the Weiss bridge often used in AC measurements.

- DC bridges are often used in resistance measurement and sensor applications to detect parameter changes in circuits.

3. Application areas:

- AC bridges are mainly used in measurement and sensor systems, AC power conditioning and other fields.

- DC bridges are mainly used in resistance measurement, sensor applications, DC power regulation and other fields.

In general, AC bridges and DC bridges have large differences in their working principles and application fields, mainly because they are designed for different types of power signals and application scenarios.

Review Editor: Huang Fei


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