What is a switching power supply?
Switching power supply is the use of electronic switching devices such as transistors, field effect tubes, thyristors, etc., through the control circuit, so that the electronic switching devices constantly "on" and "off", so that the electronic switching devices for the input voltage The electronic switching device can pulse modulate the input voltage, thus realizing DC/AC, DC/DC voltage conversion, as well as adjustable output voltage and automatic voltage stabilization.
Characteristics of switching power supply:
Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs. With with the development and innovation of power electronics technology, switching power supply is now widely used in almost all electronic equipment mainly for its small size, light weight and high efficiency, its importance can be seen.
Switching power supply classification:
Based on the way the switching devices are connected in the circuit, switching power supply can be divided into series switching power supply, parallel switching power supply, transformer switching power supply and so on three major categories. Among them, transformer-type switching power supply can be further divided into: push-pull, half-bridge, full-bridge and other types; according to the excitation of the transformer and the phase of the output voltage, can be divided into: forward excitation, flyback, single-excitation and double excitation and other types.
Switching power supply mode:
Switching power supply generally has three modes of operation: frequency, pulse width fixed mode, fixed frequency, pulse width variable mode, frequency, pulse width variable mode. The former mode of operation is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; the latter two modes of operation are mostly used for switching regulator power supply.
Switching power supply output voltage also has three working modes: direct output voltage mode, average output voltage mode, amplitude output voltage mode. Similarly, the former mode is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; the latter two modes are mostly used for switching regulated power supply.
The use of switching power supply
Switching power supply is widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, electric power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, LCD monitors, LED lamps and lanterns, communication equipment, audio-visual products, security monitoring, LED light bag The company's products are widely used in the fields of computer chassis, digital products and instruments.
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