Peak voltage lossless asynchronous absorption circuit and NPC three-level circuit

A technology of peak voltage and absorbing circuit, which is applied in the field of switching power supply to achieve the effect of flexible layout, diversification of product layout and prevention of damage

Pending Publication Date: 2019-01-18
宁波市北仑临宇电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this NPC three-level circuit, there is a spike voltage at both ends of each switching device, so how to suppress the spike voltage is a technical problem that those skilled in the art need to solve urgently

Method used

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  • Peak voltage lossless asynchronous absorption circuit and NPC three-level circuit
  • Peak voltage lossless asynchronous absorption circuit and NPC three-level circuit
  • Peak voltage lossless asynchronous absorption circuit and NPC three-level circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Please refer to Figure 11 , Embodiment 1 of the present invention provides a peak voltage lossless asynchronous snubber circuit, including a second diode Ds2 connected in series with a switching device Q1, a bus capacitor Cbus, a third diode Ds3, and a snubbing capacitor Cs1, the switching device Q1 The first diode Ds1 is reversely connected between the common intersection point of the anode of the second diode Ds2 and the common intersection point of the absorption capacitor Cs1 and the cathode of the third diode Ds3, and the switching device Q1 is turned on or Disconnection is controlled by a pulse drive signal.

[0048] Please refer to Figure 11 , the switching device Q1 in Embodiment 1 of the present invention may be a field effect transistor. The specific connection relationship is as follows: the switching device Q1, the second diode Ds2, the bus capacitor Cbus, the third diode Ds3 and the absorption capacitor Cs1 are connected in series. The anode of the sec...

Embodiment 2

[0059] Please refer to Figure 14 to Figure 17 , Embodiment 2 of the present invention is improved on the basis of Embodiment 1, and its area is that at least one diode in the charging circuit and the unidirectional discharging circuit adopts a junction field effect transistor, a bipolar transistor, Insulated gate bipolar transistor, metal oxide semiconductor field effect transistor or V-groove field effect transistor replacement, when replacing at least one diode in the charging circuit, said junction field effect transistor, bipolar transistor, insulated gate bipolar transistor The conduction direction of the polar transistor, metal oxide semiconductor field effect transistor or V-groove field effect transistor is the same as the current direction of the charging circuit; when replacing at least one diode in the unidirectional discharge circuit, the junction field effect transistor The conduction direction of the bipolar transistor, the insulated gate bipolar transistor, the...

Embodiment 3

[0064] Please refer to Figure 18 and Figure 19 , the peak voltage lossless asynchronous absorbing circuit provided by the third embodiment of the present invention is improved on the basis of the first embodiment, the difference is that the second diode Ds2 or the third diode Ds3 in the unidirectional discharge circuit adopts Resistor or inductor replacement. Figure 18It is a solution to replace the second diode Ds2 in the unidirectional discharge circuit with the inductor L1. At this time, the inductor L1 has the functions of connection and energy storage, and is used to form a discharge current loop. Figure 19 It is a solution to replace the third diode Ds3 in the unidirectional discharge circuit with the resistor R1. At this time, the resistor R1 has a connection function and is used to form a discharge current loop.

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PUM

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Abstract

A peak voltage lossless asynchronous absorption circuit and an NPC three-level circuit are provided are provided. The peak voltage lossless asynchronous absorption circuit, includes a second diode inseries with the switching device, a bus capacitor, a third diode, and an absorbing capacitor, wherein a first diode is inversely connected between a common intersection of the switching device and a second diode anode and a common intersection of the absorbing capacitor and a third diode cathode, and the switching device is turned on or off by a pulse drive signal; When the switching device is turned off, a charging circuit is composed of a first diode and an absorbing capacitor; When the switching device is turned on, a unidirectional discharge circuit is composed of an absorbing capacitor, aswitching device, a second diode, a bus capacitor and a third diode. The invention can suppress the spike voltage generated by the switching device and lossless absorb the spike voltage energy.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a peak voltage lossless asynchronous absorbing circuit and an NPC three-level circuit. Background technique [0002] In the field of switching power supply technology, the main components of the switching power supply are switching devices. Since the switching device needs to be connected to other components through wires in the power circuit, and the wires and even the pins of the switching device have parasitic inductance, the switch Both the length and width of the wire in the connection loop of the device affect the size of the parasitic inductance, and the way the wire is laid out in the printed circuit board affects the size of the parasitic inductance. figure 1 It is a simple schematic diagram of the output circuit of the switching device. Please refer to figure 1 , the switching device Q1 forms a current loop through the wire and the capacitor C1, becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/34H02H9/04
CPCH02H9/04H02M1/34H02M1/342Y02B70/10
Inventor 袁媛李跃松张迪李佳航
Owner 宁波市北仑临宇电子科技有限公司
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