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Double step-down bridge type inverter controlling method for single current sensor

A control method and double step-down technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as increased cost, high switching loss, increased filter volume and weight, etc. , to achieve the effect of reducing cost, improving efficiency, reducing volume and weight

Inactive Publication Date: 2009-03-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it has the disadvantage of low utilization rate of the input DC voltage, that is, the highest output voltage of the bridge arm is only half of the input DC voltage
The double-buck bridge inverter solves the problem of low utilization of the input DC bus voltage of the double-buck half-bridge inverter.
However, if the control method of the traditional double-buck half-bridge inverter is adopted, two current sensors are required, which increases the cost compared with the traditional bridge inverter; the use of bipolar modulation in the entire power frequency cycle increases the filter The volume and weight; all power switch tubes are switched at high frequency in half the power frequency cycle, and the switching loss is relatively high

Method used

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  • Double step-down bridge type inverter controlling method for single current sensor
  • Double step-down bridge type inverter controlling method for single current sensor
  • Double step-down bridge type inverter controlling method for single current sensor

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Embodiment Construction

[0019] Such as figure 1 shown. A control method for a double step-down bridge inverter with a single current sensor, the double step-down bridge inverter consists of four bridge arm circuits, namely the first bridge arm circuit 1 to the fourth bridge arm circuit 4, a power supply U in , the first filter inductance L 1 to the fourth filter inductor L 4 , filter capacitor C f , load R L Composed of, wherein the first bridge arm circuit 1 is composed of the first power switch tube S 1 and the first freewheeling diode D 1 Composed of, the second bridge arm circuit 2 is composed of the second power switch tube S 2 and the second freewheeling diode D 2 Composed of, the third bridge arm circuit 3 is composed of the third power switch tube S 3 and the third freewheeling diode D 3 Composed of, the fourth bridge arm circuit 4 is composed of the fourth power switch tube S 4 and the fourth freewheeling diode D 4 Composition; power supply U in The anode of the first power switc...

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Abstract

The invention discloses a method for controlling a single current sensor double-decompression bridge-type inverter, which belongs to methods for controlling inverters. The invention adopts a single current sensor to collect inverter inductor current, and an output voltage outer ring receives an inverter output voltage feedback signal and an output voltage set signal, and outputs a set inductor current. An inductor current inner ring receives the set inductor current and the inductor current feedback signal, and outputs a logic control signal. The power switch tube drives a logic circuit to receive the logic control signal, the inductor current feedback signal and the output voltage feedback signal, and to output high and low level actuating signals of each power switch tube. The method only needs a current sensor, the cost is reduced, simultaneously, the volume and weight of a filter can be reduced through adopting the control method, and the efficiency of the inverter is improved.

Description

technical field [0001] The invention relates to a control method of an inverter, in particular to a control method of a single current sensor double-buck bridge inverter. Background technique [0002] With the continuous shortage of fossil energy and the aggravation of environmental pollution, the distributed power generation system based on new energy and renewable energy has become a research hotspot, and the inverter is an important part of it. Reliability is an important index to measure inverter performance. The double step-down half-bridge inverter improves the reliability of the system because there is no direct problem of the power tube of the bridge arm of the traditional bridge inverter. However, it has the disadvantage of low utilization rate of the input DC voltage, that is, the maximum output voltage of the bridge arm is only half of the input DC voltage. The double-buck bridge inverter solves the problem of low utilization of the input DC bus voltage of the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
Inventor 姚志垒王勤肖岚严仰光徐璜
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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