What is the method to increase the operating frequency of switching power supply?
What is the method to increase the operating frequency of switching power supply? Industrial control equipment switching power supply is one of Chengliang power supply series, and its advantages are widely used. The switching power supply life of industrial control equipment and the barrel effect of using components, so the key components have a significant impact on it. The key to power miniaturization is the miniaturization of the power supply, so minimize the loss of the power supply circuit. When the switching power supply of the industrial control equipment power supply is in the switching state, the switching loss of the switching power supply such as the industrial control equipment power supply is inevitable, and the loss will increase as the switching frequency increases. In addition, the loss of magnetic components and capacitive components (such as transformers and reactors) in switching power supplies will also increase continuously with the increase of frequency.
In the current market, most power transistors in industrial control equipment power supplies and other switching power supplies are dual transistors, and the switching frequency can reach tens of kHz. Use high-speed switching devices to increase the switching power supply operating frequency. In principle, the switching loss is 0 and the noise is small. This method can increase the operating frequency of the switching power supply. At present, switching power supplies for industrial control equipment have been used in terminal equipment, communication equipment and other electronic equipment mainly based on electronic computers, with small size, light weight and high power. Power supply mode: Small and light requirements are put forward for the switching power supply, which requires high power, good function and high stability.
What are the working modes of switching power supply?
Working mode of switching power supply:
Switching power supplies generally have three working modes: fixed frequency and pulse width mode, fixed frequency and variable pulse width mode, and variable frequency and pulse width mode.
The former working mode is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; the latter two working modes are mostly used for switching regulated power supply.
In addition, the switching power supply output voltage also has three working modes: direct output voltage mode, average output voltage mode, and amplitude output voltage mode. Similarly, the former working mode is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; the latter two working modes are mostly used for switching regulated power supply.
According to the way switching devices are connected in the circuit, the currently widely used switching power supplies can be roughly divided into three categories: series switching power supplies, parallel switching power supplies, and transformer switching power supplies. Among them, the transformer-type switching power supply (hereinafter referred to as the transformer switching power supply) can be further divided into: push-pull type, half-bridge type, full-bridge type, etc.; according to the excitation of the transformer and the phase of the output voltage, it can be divided into: forward type , Flyback, single-excited and double-excited; if it is divided from the use, it can be divided into more types.
