Switching power supply is a kind of power supply that uses modern power electronics to control the time ratio of switching on and off in time to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. At present, the switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today’s electronic information industry.
Main use: Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrument equipment, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystals Displays, LED lamps, security monitoring, digital products and instruments and other fields.
Basic composition of switching power supply
1. Main circuit
Impulse current limit: limit the impulse current on the input side when the power is turned on.
Input filter: Its function is to filter the clutter that exists in the power grid and prevent the clutter generated by the machine from being fed back to the power grid.
Rectification and filtering: Directly rectify the AC power of the grid into a relatively smooth DC power.
Inverter : Turn the rectified road point into high-frequency alternating current, which is the core part of high-frequency switching power supply.
Output rectification and filtering: According to the needs of the load, provide a stable and reliable DC power supply.
2. Control circuit
On the one hand, samples are taken from the output terminal and compared with the set value, and then the inverter is controlled to change the pulse width or pulse frequency to stabilize the output. On the other hand, according to the data provided by the test circuit, the protection circuit provides The control circuit carries out individual protection measures for the power supply.
3. Detection circuit
Provide the data of various parameters and various instruments in operation in the protection circuit.
4. Auxiliary power
Realize the software (remote) start of the power supply, and supply power for the protection circuit and the control circuit (chips such as PWM)
Switching power supply is a kind of power supply that uses modern power electronics to control the time ratio of switching on and off in time to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. At present, the switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today’s electronic information industry.
Main use: Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrument equipment, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystals Displays, LED lamps, security monitoring, digital products and instruments and other fields.
Basic composition of switching power supply
1. Main circuit
Impulse current limit: limit the impulse current on the input side when the power is turned on.
Input filter: Its function is to filter the clutter that exists in the power grid and prevent the clutter generated by the machine from being fed back to the power grid.
Rectification and filtering: Directly rectify the AC power of the grid into a relatively smooth DC power.
Inverter : Turn the rectified road point into high-frequency alternating current, which is the core part of high-frequency switching power supply.
Output rectification and filtering: According to the needs of the load, provide a stable and reliable DC power supply.
2. Control circuit
On the one hand, samples are taken from the output terminal and compared with the set value, and then the inverter is controlled to change the pulse width or pulse frequency to stabilize the output. On the other hand, according to the data provided by the test circuit, the protection circuit provides The control circuit carries out individual protection measures for the power supply.
3. Detection circuit
Provide the data of various parameters and various instruments in operation in the protection circuit.
4. Auxiliary power
Realize the software (remote) start of the power supply, and supply power for the protection circuit and the control circuit (chips such as PWM)
Post time: Aug-21-2021