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DC-AC converter switching-period-by-switching-period peak current limiting system and method

A technology of DC-AC and peak current, which is applied in the field of peak current limiting system of DC-AC converter by switching cycle, which can solve the problems such as difficult to realize peak current limiting, so as to improve system reliability, fast response speed, eliminate Effects of Subharmonic Oscillations

Active Publication Date: 2020-08-25
XIAN ACTIONPOWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the DC-AC converter in the prior art is difficult to realize peak current limiting, the present invention proposes a DC-AC converter switching cycle-by-switching peak current limiting system and method, adopts an analog circuit, has fast response speed, and adds slope compensation unit to eliminate subharmonic oscillation

Method used

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  • DC-AC converter switching-period-by-switching-period peak current limiting system and method
  • DC-AC converter switching-period-by-switching-period peak current limiting system and method
  • DC-AC converter switching-period-by-switching-period peak current limiting system and method

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Embodiment 1

[0086] figure 1 A schematic diagram of the switching cycle-by-switching peak current limiting system of the DC-AC converter according to the embodiment of the present invention is given. The power execution part and the current limiting control part of the DC-AC converter are mainly described below.

[0087] In the H-bridge circuit of the DC-AC converter, the input voltage 101 is applied to the drains of the first switch transistor 102 and the third switch transistor 109, and the input ground 105 is connected to the second switch transistor 104 and the fourth switch through the current sensor 107. The source of the transistor 106, the source of the first switching transistor 102 and the drain of the second switching transistor 104 and one end of the inductor 110 are connected to the first voltage node 103, the source of the third switching transistor 109 and the fourth switching transistor The drain of the inductor 106 and one end of the capacitor 111 are connected to the sec...

Embodiment 2

[0102] In Embodiment 1, the current sampling point is located in the DC input loop, that is, the current sensor collects the DC input current of the H-bridge, and the sensor will introduce parasitic inductance, which has an adverse effect on the switching transistor, and is not suitable for DC-AC conversion with a power greater than 10kW device, while this example gives Figure 5 The inductor current sampling method shown can be used for DC-AC converters exceeding 10kW. The difference between this embodiment and the first embodiment is that the sampling position of the current sensor 107 is different, and the current sensing signal ISENSE is generated after passing through the rectification circuit 122 . Figure 5 The medium current sensor 107 adopts a Hall sensor and is located between the inductor 110 and the first voltage node 103 . The output signal of the current sensor 107 passes through the rectification circuit 122 to generate a current sensing signal ISENSE. The work...

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Abstract

The invention relates to a current limiting system and a current limiting method used in a DC-AC converter, in particular to a DC-AC converter switching-period-by-switching-period peak current limiting system and method, and solves the problem that the traditional DC-AC converter is difficult to realize peak current limiting. The DC-AC converter switching-period-by-switching-period peak current limiting system comprises a control driving circuit, a DC-AC conversion circuit and a current limiting control circuit, wherein the current limiting control circuit is realized by adopting an analog circuit and comprises a logic synthesis unit, a slope compensation unit, a summation unit, a current limiting comparator, an SR latch and a NOT gate; and the slope compensation unit is added to eliminatesubharmonic oscillation caused by switching frequency, so that the response speed is high, and the working state is stable. Meanwhile, the invention provides a DC-AC converter switching-period-by-switching-period peak current limiting method. In addition, the invention also provides a switching-period-by-switching-period peak current limiting system and method for a DC-AC converter with power greater than 10kW.

Description

technical field [0001] The invention relates to a current limiting system and a current limiting method used in a DC-AC converter, in particular to a DC-AC converter peak current limiting system and method by switching cycle. Background technique [0002] There are two traditional current limiting circuits: one is the current limiting technology based on average current control; the other is the current limiting technology based on peak current control. The performance of the current-limiting circuit using average current control depends largely on the response speed of the controller: the controller responds quickly, which may easily cause insufficient system loop margin and oscillate; Overshoot, resulting in the overshoot of the current limit point several times, can not achieve the ideal purpose of current limit protection. However, the response speed of the peak current limiting mode is fast, and the delay time can be as small as tens of nanoseconds to hundreds of nanos...

Claims

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Application Information

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IPC IPC(8): H02M1/088H02M7/5387H02M1/32
CPCH02M1/088H02M1/32H02M7/53871
Inventor 常军
Owner XIAN ACTIONPOWER ELECTRIC
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