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Improved pulse sequence control method of switch power supply and device thereof

A pulse sequence, switching power supply technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of large output voltage steady-state error, unsuitable voltage accuracy, large output voltage ripple, etc., to achieve easy integration, good Transient Response Capability, Cost-Effective Effect

Inactive Publication Date: 2012-05-09
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the output voltage ripple is relatively large when the converter works in a steady state, which is the main factor hindering the wide application of the pulse sequence control method.
Another new multi-level pulse sequence control method better solves the problem of large ripples, but the steady-state error of the output voltage is slightly larger, which is not suitable for applications that require high voltage accuracy.

Method used

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  • Improved pulse sequence control method of switch power supply and device thereof
  • Improved pulse sequence control method of switch power supply and device thereof
  • Improved pulse sequence control method of switch power supply and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] figure 1 It is shown that a specific embodiment of the present invention is a control method of a switching power supply, and its specific method is:

[0054] At the beginning of each switching cycle, according to the switching converter TD output voltage V o with reference voltage V ref The relationship between high and low, and the range of the load size, select the effective control pulse in the switching cycle, so as to realize the control of the switching converter TD. Its control pulse selection rule is: when the load current I o Higher than the load current threshold I 1 , if V o below V ref , using the control pulse P H，1 Control the switch tube S in the converter; if V o higher than V ref , using the control pulse P L，1 Control switch tube. When the load current I o At the load current threshold I 1 and I 2 between, if V o below V ref , using the control pulse P H，2 Control switch tube; if V o higher than V ref , using the control pulse P L，2...

Embodiment 2

[0073] Figure 10 As shown, this example is basically the same as the first example, the difference is: the control pulse P is generatedH，n The method is: at the beginning of a certain switching cycle t 0 moment, the control pulse P H，n From low level to high level, the switch tube S in the converter TD is turned on, and the inductor current I L rise; when I L rises to the peak value of the inductor current I H，n , the control pulse P H，n From high level to low level, the switch tube S is turned off until the end of the switching period t 0 +T. Generate control pulse P L，n The process and produce P H，n The process is similar, the difference is that the peak value of the inductor current corresponding to the control pulse is I L，n . It can be seen that the control pulse P H，n and P L，n (n=1, 2, 3...N+1) respectively correspond to the fixed inductor current peak value I H，n and I L，n (I H，n >I H，2 ≥I L，1 >I H，3 ≥I L，2 ...>I H，N+1 ≥I L，N >I L，N+1 ).

[0074]...

Embodiment 3

[0076] Figure 11 As shown, this example is basically the same as the first example, the difference is: the control pulse P is generated H，n The method is: at the beginning of a certain switching cycle t 0 moment, the control pulse P H，n From low level to high level, the switch tube S in the converter TD is turned on, and the voltage V on the equivalent series resistance (ESR) of the filter capacitor ESR rising; when V ESR Rise to the peak equivalent series resistance voltage V H，n , the control pulse P H，n From high level to low level, the switch tube S is turned off until the end of the switching period t 0 +T. Generate control pulse P L，n The process and produce P H，n The process is similar, the difference is that the peak value of the equivalent series resistance voltage corresponding to the control pulse is V L，n . It can be seen that the control pulse P H，n and P L，n (n=1, 2, 3...N+1) respectively correspond to the fixed equivalent series resistance voltage p...

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Abstract

The invention discloses an improved pulse sequence control method of a switch power supply and a device thereof. The method comprises the following step: at starting time of each switch period, selecting effective control signals of the switch period in a plurality of control pulses with different duty cycles according to the high-low relation between output voltage Vo and reference voltage Vref of a switch converter and the range located by loading size, thus realizing control to the switch converter. The control method has simple principle and convenient and fast design, is applicable to various converters with topological structures; and the switch converter adopting the control method has less output voltage ripple, fast dynamic response, high voltage accuracy, and strong stability and anti-interference capability.

Description

technical field [0001] The invention relates to a control method and device for a switching power supply. Background technique [0002] Many electrical devices such as microprocessors, communication equipment, industrial control equipment, and electric machinery require the processing of electric energy from general power supply devices (such as power grids, batteries, photovoltaic power generation devices, etc.) to meet their use requirements. In recent years, switching power supply technology for DC-DC conversion using semiconductor power devices as switching devices has been a hot spot in engineering applications and theoretical research in the electrical field. [0003] A switching power supply is generally composed of a DC-DC converter (that is, a DC-DC converter) and a controller. The converter is used for electric energy conversion, and generally consists of switching devices, rectification and filtering circuits, isolation transformers, etc. The topology of the conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10
Inventor 秦明许建平
Owner SOUTHWEST JIAOTONG UNIV
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