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Improved technique for pulse-width modulation of switching power supply and device for achieving same

A pulse width modulation, switching power supply technology, applied in the direction of pulse duration/width modulation, output power conversion devices, electrical components, etc., can solve the slow change of pulse width, slow dynamic response speed of switching power supply, slow change of error signal and other problems to achieve the effect of improving the transient response speed

Inactive Publication Date: 2009-09-30
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the input voltage or load fluctuates, due to the limited amplification factor of the error amplifier and the existence of the compensation network, the error signal changes relatively slowly, so the pulse width changes slowly, which makes the dynamic response of the switching power supply slow.
Therefore, with the improvement of performance requirements for switching power supply in terms of transient response speed in some applications, it is difficult for pulse width modulation technology to meet this requirement, which urgently requires a new control method to improve the transient response speed of switching power supply. responding speed

Method used

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Embodiment 1

[0016] figure 1 Shown, the specific embodiment of the present invention is: an improved switching power supply pulse width modulation technology, its controller (Controller) mainly consists of a voltage detection device VD, an error amplifier EA, an analog multiplexer AM, and a voltage interval judger Composed of VIJ, comparator COM and drive circuit DC. The output voltage of the power converter PTD is compared with the reference voltage after the voltage detection device VD, and then the error signal is obtained after the error amplifier EA and the compensation network CN; the voltage interval judge VIJ generates a corresponding signal to control the voltage according to the magnitude of the error signal voltage. The analog multiplexer AM works; the analog multiplexer AM selects the corresponding voltage signal as output according to the control signal generated by the voltage interval judger VIJ, and then compares it with the carrier signal CS to obtain the final control pul...

Embodiment 2

[0024] Image 6It is shown that, compared with the first embodiment, the power converter of this example is a flyback converter, and the control device is the same as that of the first embodiment. It is also proved by simulation that the output voltage of the flyback converter adopted in the present invention is stable and the dynamic response speed is fast.

[0025] In addition to being used to control the two power converters in the above embodiments, the present invention can also be used in power circuits composed of Boost converters, Buck-boost converters, forward converters, half-bridge converters, and full-bridge converters. switch power supply.

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Abstract

The invention discloses an improved technique for pulse-width modulation of a switching power supply and a device for achieving the same, wherein according to error signals generated by output voltage and reference voltage of the switching power supply, the technique achieves the control of the switching power supply by comparing a voltage signal and a carrier signal correlative with the error signals by a comparator to obtain a control signal. The technique and the device are characterized in that the device is provided with a voltage range judging device for judging the voltage range of the error signals, different voltage signals are selected to be compared with carrier waves in the comparator according to the different ranges of the error signals, and the comparison output is used as a driving signal for controlling the work of a main power switching tube to adjust the output voltage of the switching power supply. The technique and the device can be applied to controlling switching power supplies with various topological structures, and the highlight advantage is that the switching power supply adopting the proposal has quick transient response.

Description

technical field [0001] The invention relates to switching power supply equipment, in particular to the field of switching power supply pulse width modulation technology and its realization device manufacturing. Background technique [0002] Switching power supply is a power electronic device that is widely used in the fields of electronics, communication, electricity, energy, aerospace, military and home appliances. It has the advantages of high power conversion efficiency, small size, light weight, high control precision and good speed. It basically replaces the linear adjustment power supply in the small power range, and quickly advances to the medium and high power range. It replaces the thyristor-like rectifier power supply. It can be said that switching power supply technology is the mainstream technology of small and medium power DC power conversion devices at present. The switching power supply is mainly composed of two parts: a power converter and a controller. Th...

Claims

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Application Information

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IPC IPC(8): H02M3/145H03K7/08
Inventor 王金平许建平周国华秦明
Owner SOUTHWEST JIAOTONG UNIV