A high-efficiency balance control method for output power of parallel power supply system
A technology of output power and power supply system, which is applied in the field of high-efficiency and balanced control of output power in parallel power supply systems, which can solve problems such as the inability to guarantee the operating range of power supply modules and output load changes, and achieve superior dynamic response indicators, low cost, and good practicability Effect
Active Publication Date: 2019-08-23
WENZHOU UNIV
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Problems solved by technology
[0005] On the other hand, due to the load change of the parallel power supply system, the output load of each power module will change accordingly
Although the output power balance control can solve the problem of maintaining the relative load consistency of the power modules in the parallel power supply system, that is, the balanced control of the output power per unit value, it cannot ensure that the power modules work in a higher operating range
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[0024] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:
[0025] figure 1 It is a system structure diagram of the parallel power supply output power balance control method. This structure diagram generally illustrates the internal components of the power supply module of the parallel power supply system, the connection mode between the power supply modules and the electrical equipment. The serial number is k (1≤k≤N) below. The power module is introduced. The power module includes: capture unit, PWM modulation unit, synchronous trigger unit, power module control algorithm, PWM drive circuit, power converter main circuit, voltage detection, current detection, voltage sampling and current sampling, resistor R, diode D, diode D. s , Terminal J1 and terminal J2. The capture unit is used to capture PWM max on-time of The PWM modulation unit is used to convert the output power p k (t) The modulation period is T and...
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The invention provides a high-efficiency balanced control method of the output power of a parallel power supply system. The method includes: the output voltage vk(t) and the output current ik(t) are respectively acquired, PWMmax of a PWM signal is obtained, the per-unit value p<*><k>(t) of the output power is calculated shown in the description, U element arrays shown in the description are updated, and the mean value shown in the description of the per-unit values of the output power is obtained; according to the switch-on time of the obtained PWMmax, the maximum output power per-unit value p<*><max>(t) and the deviation value [delta]p<*><k>(t) shown in the description are calculated, and a power balanced control algorithm of the parallel power supply system is executed to realize a balanced control function of the output power; and the voltage control quantity uk and the PWM signal PWMpk(t) with the duty ratio shown in the description are output, the control of the output voltage and the balanced control of the output power of a power supply module are realized, and the difference of the output power per-unit values is converted to the switch-on time difference [delta]t<k><on> of two channels of PWM signals. According to the scheme, the deviation of the average power reference of analog signals due to interference with high-frequency switch signals and imbalanced impedance is avoided, the average power control deviation value [delta]p<*><k>(t) can be obtained only through the period of a synchronization signal Syn during hot plugging of a power supply, and compared with the conventional scheme, the dynamic response index is excellent.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to a high-efficiency balance control method for output power of a parallel power supply system. Background technique [0002] Communication equipment needs a parallel switching power supply system to provide power supply for its equipment. This is based on the parallel output structure of multiple power supply modules in the parallel power supply system. It has strong compatibility, N+m redundant backup, high reliability, high cost performance, and design With a series of advantages such as low difficulty and easy management, it has become one of the preferred solutions for the design of communication power supplies. The power supply of the existing communication equipment is powered by multiple power modules of the same type connected in parallel, which will cause some power modules in the system to be damaged and cannot be replaced by other types of power modules with the same out...
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IPC IPC(8): H02J1/10H02J3/38
Inventor 彭志辉李凯周晨潘晓铭刘文文
Owner WENZHOU UNIV