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High-precision wide-range isolated DC power supply

A DC power supply and wide-ranging technology, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, electrical components, etc., can solve problems such as inability to achieve high-precision control of low voltage and small current, and achieve It is convenient for parallel expansion, fast response and large adjustment range

Inactive Publication Date: 2019-04-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the traditional voltage source PWM converter is used as a controllable rectifier, since the minimum output voltage of the DC side also needs to be close to the peak voltage of the AC side, it cannot only use single-stage AC / DC for wide-range output, but often uses AC / DC / DC two-stage topology, but as mentioned above, because the DC bus voltage is too high, the output voltage and current required by the load on the DC side are relatively small, due to the existence of the voltage source converter control dead zone and the optimal DC / DC Gain ratio and stable gain ratio requirements are limited, and it is basically impossible to achieve high-precision control of low voltage and small current

Method used

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  • High-precision wide-range isolated DC power supply

Examples

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Embodiment 1

[0039] see figure 1 , The high-precision and wide-range isolated DC power supply includes a three-phase power grid connected to the load through the main circuit, and the controller is connected to the main circuit. It is characterized in that: the main circuit is a mixed topology main circuit, which is composed of a three-phase filter circuit, a three-phase AC-DC converter, a single-phase DC-AC converter connected with a single-phase AC-DC converter; The controller is a programmable high-precision wide-range controller, which is composed of a main control unit connected with a driving circuit a and a driving circuit b, and connected with a voltage sensor and a current sensor through an A / D conversion module; the main control unit The unit adopts DSP chip TMS320F28335, the drive circuit a is connected to the three-phase AC-converter, the drive circuit b is connected to the single-phase DC-AC converter, and the voltage sensor and current sensor collect the AC in the current sou...

Embodiment 2

[0041] see figure 2 , the high-precision and wide-range isolated DC power supply is specifically a photovoltaic cell simulation system with a high-frequency isolation hybrid converter topology. According to the state of the switch on the AC side of the three-phase current source PWM converter, it can be known that the voltage on the AC side is applied to both ends of the DC inductance L. From the AC side, this voltage is based on the 6 voltage vectors generated by the AC switch, such as Figure 4 shown. Depend on image 3 The current space vector sum shown Figure 4 The voltage vectors shown are basically the same. According to the ON / OFF of the AC switch, the voltage on the AC side is applied to both ends of the DC inductance L. From the AC side, this voltage is 6 voltage vectors generated according to the ON / OFF switch, such as image 3 shown. can be seen, image 3 The current vector of Figure 4 The voltage interval vectors are exactly the same. Through analysis we...

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Abstract

The invention discloses a high-precision wide-range isolated DC power supply which comprises a three-phase power grid connected to a load via a main circuit, the controller is connected to the main circuit, and the main circuit is a hybrid topological main circuit formed by connecting a three-phase filter circuit, a three-phase AC-DC converter and a single-phase DC-AC converter with a single-phaseAC-DC converter. The controller is a programmable high-precision wide-range controller formed in the way that a main control unit is connected to a driving circuit a, a driving circuit b and a voltage sensor and a current sensor via an A / D conversion module. The power supply further comprises the voltage sensor and the current sensor. The main control unit generates a PWM wave according to the collected voltage and current signals and control requirements. The power supply adopts the novel hybrid converter topological structure based on a current supply type converter and can avoid the fact that the voltage is difficult to adjust accurately in a wide range due to the limitation of the gain ratio, especially under low voltage and current, the current supply type converter has higher precision than a voltage supply type converter.

Description

technical field [0001] The invention relates to a high-precision and wide-range isolated DC power supply. Background technique [0002] DC power supply and load device is a core device to realize energy conversion and diversified applications. It is widely used in all walks of life, from power adapters, switching regulated power supplies to DC power transmission and distribution systems. With the rapid development of power electronics and control technology, high-performance DC power supplies can not only be used as general power supplies such as DC system power supplies, communication base station power supplies, and experimental test power supplies, but also can be used as photovoltaic analog power supplies. [0003] When the traditional voltage source PWM converter is used as a controllable rectifier, since the minimum output voltage of the DC side also needs to be close to the peak voltage of the AC side, it cannot only use single-stage AC / DC for wide-range output, but o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M3/335
CPCH02M3/33523H02M3/33569H02M7/219
Inventor 赵剑飞俞涛刘廷章花敏琪洪新海
Owner SHANGHAI UNIV
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