【 Weak current College 】 linear regulated power supply and switch on the power of difference 】

Linear regulated power supply by altering the degree of conduction of transistor to change and control the output voltage and current, linear regulated power supply in transistor as a variable resistance, threaded in power supply circuit. As a variable resistance and load current flowing through the same, so you want to consume large amounts of energy and cause a warming, low voltage conversion efficiency. Linear regulator have a common characteristic is its power devices to adjust work online sexual area, adjust the pipe between the voltage drop to stable output. Since the regulation tube static loss, you need to install a large heat sink to its cooling. Because linear power supply transformer in power frequency (50Hz), so the quality is great.

Linear regulated power supply used in low-voltage applications, like the need to meet certain LDO voltage difference. Output voltage regulation and ripple is better, inefficient, need fewer external components, low cost. Circuit is relatively simple.

The advantage of linear regulated power supply is stable, small ripple, high reliability and easy to create multiple output continuously adjustable power supply. The disadvantage is less bulky, heavy, efficiency was relatively low. This type of power supply and there are many, from the output property can be divided into regulated power supply, steady flow of power and set voltage, steady flow in a voltage regulator (bistable) power. Judging from the output values can be divided into fixed output power, band switch adjustment and potentiometer several continuous adjustable. From the output indicates that the pointer indicates on separable type and digital display-type, etc.

Switching power supply-wide voltage range, the pressure difference is not required, you can use different circuit topology for different output requirements. Adjustment rate and output ripple less than linear power supply, high efficiency. Need for external components, the cost is high. Circuit relatively complex. Switching DC power supplies its main circuit type Flyback, converter, half-bridge, push-pull and full-bridge. It and linear regulated power supply of the fundamental difference between circuits in power transformers does not work and is working in several dozens kHz to few MHz. Power tube not work online sexual area, but a saturated and cut-off region, i.e. work in the switch state; switching DC power supply or so.

Linear regulated power supply and switching power supply the biggest difference is the linear regulated power supply in the tubes (either bipolar or MOSFET) works in linear and switching power supply pipe work on or off. Linear regulated power supply and switching power supplies also.