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Improved Buck converter

A converter, an improved technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc. The effect of system reliability, simple topology and few components

Inactive Publication Date: 2015-08-05
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the switch tube is on and off, the input current is intermittent and contains high-frequency harmonic current, which will introduce electromagnetic conduction interference to the power system, which is not conducive to the stability of the system.
[0004] In order to improve system stability and operational reliability, an LC filter is introduced at the input end of the traditional Buck topology to form a Buck transformation topology with an input LC filter, such as figure 2 As shown, it is used to suppress the high-frequency input pulsating current and attenuate the input current harmonics. However, through the analysis of the stability of AC small signals, it can be known that the Buck transform topology with an input LC filter has a right-half plane zero point, which leads to Hidden dangers of system instability

Method used

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Embodiment Construction

[0018] The technical solutions of the present invention will be described in detail below in conjunction with embodiments.

[0019] Such as image 3 As shown, the improved Buck conversion topology includes an input filter circuit 1, a power conversion circuit 2, and an output filter circuit 3.

[0020] a) Input filter circuit

[0021] The input filter circuit 1 is composed of an input filter capacitor C1 and an input filter inductor L1, and is used to filter out high frequency harmonic components in the input current to make the input current continuous. When the switch Q1 is in the off state, the input voltage charges the input filter capacitor C1, and together with the input filter inductor L1 current to provide the load current; when the switch Q1 is in the on state, the input capacitor C1 passes through the switch The tube releases charge and provides load current along with the input current. The current direction of the input filter inductor L1 is always bottom-up.

[0022] b)...

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PUM

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Abstract

The invention discloses an improved Buck converter comprising an input filter circuit, a power conversion circuit, and an output filter circuit. The converter evolves from a Buck topology provided with an input filter, and the position of an input filter inductor is moved to a power loop line. The converter is simple in structure and high in conversion efficiency, and high-frequency response manifests as a first-order system. For a converter controlled by a PWM transconductance error amplifier, the stability of a closed-loop control system is further improved.

Description

Technical field [0001] The invention belongs to the technical field of direct current-direct current (DC-DC) converter control, and particularly relates to a step-down DC-DC converter suitable for an input voltage higher than an output voltage. Background technique [0002] With the development of aerospace technology, spacecraft load power continues to increase. In order to reduce system power transmission loss and improve space energy utilization, for spacecraft power supply systems with larger load power, high-voltage power supply buses, such as 100V or 100V, are generally selected Above the power bus. In this type of spacecraft with high-voltage bus power, the bus voltage of the general power system is higher than the battery voltage, so the charge controller for charging the battery needs to achieve a voltage reduction function. Because Buck converter is a step-down conversion topology, with simple structure and fewer components, it is suitable for occasions with high relia...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 姜月季飚王田屈诚志涂浡刘辉
Owner SHANGHAI INST OF SPACE POWER SOURCES
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