A linear power source is an electronic device that converts alternating current (AC) into direct current (DC) with a relatively low voltage ripple and noise. Unlike switching power supplies, which use high-frequency switching circuits to regulate the output voltage, linear power supplies use a linear regulator to control the output voltage. They are commonly used in various electronic devices, including audio equipment, laboratory instruments, and medical devices.
Features
Linear power sources offer several advantages over switching power supplies. One of the main advantages is their low output voltage noise and ripple. Linear power supplies use a low-pass filter to eliminate high-frequency noise and ripple, resulting in a clean and stable output voltage. Another advantage of linear power supplies is their low electromagnetic interference (EMI) emission. Linear power supplies use linear regulators that produce less EMI than switching regulators. Additionally, linear power supplies offer excellent line and load regulation, meaning their output voltage remains stable even when the input voltage or load changes.
Applications
They are commonly used in applications where low noise, high stability, and low EMI are critical. Here are some examples of their typical applications:
Audio equipment: Linear power supplies are often used in high-end audio equipment such as preamplifiers, power amplifiers, and digital-to-analog converters (DACs).
Laboratory instruments: Linear power supplies are used in laboratory instruments such as oscilloscopes, signal generators, and power supplies.
Medical devices: Linear power supplies are used in various medical devices, such as patient monitors, infusion pumps, and ultrasound machines.
Industrial equipment: Linear power supplies are used in various industrial equipment, such as machine tools, robotics, and automation systems.
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