1 Control through voltage and current

The control methods of switch power supplies are often issues commented on by relevant operators, not only to carry out the effective use of switch power supplies and future development. Switch power supplies can be controlled through voltage and current. Voltage control requires comparing the converter output voltage feedback signal with the output voltage reference signal, then deriving the error signal of the output voltage. A series of related calculations are performed to obtain the corresponding drive signal, which then drives the circuit to achieve stable output voltage of the device. The control of digital power supply voltage is relatively cumbersome, but the design and analysis of digital power supply voltage control are quite simple. The voltage control of digital power supplies is easily affected by variable factors such as input voltage steps, and the system's dynamic response speed is relatively slow. Compared to voltage, the entire current inner loop system is more stable. When input voltage or load jumps cause output voltage changes, the change rate of inductor current correspondingly changes, leading to changes in the entire system. However, the benefits of current control in digital power supply control are numerous. Digital average current control technology has the advantages of peak current methods, allowing for accurate monitoring of output current, even under intermittent inductor current conditions, it can still follow the output current. Moreover, current control has strong anti-noise interference capability, making it suitable for systems with significant interference. This anti-interference capability can improve the operational efficiency of switch power supplies, which is a benefit that many other control methods cannot achieve. However, digital average current control also has shortcomings; the difficulty of designing and implementing the control method is relatively high, and the dynamic response speed of average current control is not as strong as that of peak current control.

2. Introduction to switch power supply control technology

Once switch power supply devices have developed to a certain extent, it is necessary to improve the performance of the products and innovate the control technology of switch power supplies. Currently, the control methods for switch power supplies include soft switching technology and power factor correction technology, each with its own advantages. The development is to combine all the advantages of switch power supplies to develop a new type of switch power supply control technology. However, the development of each technology takes a long time, so the approach is to reasonably utilize existing technologies while developing new technologies, trying to avoid exposing the shortcomings of the technology and maximizing strengths while minimizing weaknesses. The advantage of soft switching technology is that it can reduce the switching losses of power devices, allowing power devices to switch under zero voltage or zero current conditions, reducing the size and weight of converters, and lowering system switching noise. Currently, many electronic systems are noise-free, but many electronic products still experience noise issues after prolonged use. Therefore, switch power supply technology can start from minimizing noise and develop a new type of noise reduction switch power supply control system. A significant problem currently facing switch power supplies is that the switching range is too narrow, so expanding the switching position is a condition for further development of switch power supply control technology.

The advancement of switch power supply technology is inseparable from the development of integrated circuits and design technology. Switch power supply technology also needs innovation to achieve high intelligence. Each switch power supply control technology has its advantages and disadvantages, so the most important thing to do at this stage is to develop and innovate new switch power supply control technologies, improve switch power supply control technology, and support the future development of electronic power.