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Peak voltage lossless synchronous absorption circuit and step-up and step-down switching power supply circuits

A technology of peak voltage and absorbing circuit, applied in electrical components, adjusting electrical variables, instruments, etc., can solve problems such as common mode interference, and achieve good effect of suppressing common mode interference

Pending Publication Date: 2019-01-01
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

Since d(VD1)≠0 during the switching process of the switching device Q1, then i1≠0, i1+i2=i1≠0, so the switching device Q1 has a current to the ground when switching, that is, there is common mode interference

Method used

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  • Peak voltage lossless synchronous absorption circuit and step-up and step-down switching power supply circuits
  • Peak voltage lossless synchronous absorption circuit and step-up and step-down switching power supply circuits
  • Peak voltage lossless synchronous absorption circuit and step-up and step-down switching power supply circuits

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Experimental program
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Effect test

Embodiment 1

[0050] Please refer to Figure 10 , Embodiment 1 of the present invention provides a peak voltage lossless synchronous snubbing circuit, including a first diode Ds1, a third diode Ds3, a bus capacitor Cbus, a fourth diode Ds4 and a second Diode Ds2, the common intersection of the cathode of the first diode Ds1 and the anode of the third diode Ds3 is connected to the common intersection of the cathode of the fourth diode Ds4 and the anode of the second diode Ds2 There is a snubber capacitor Cs1, and the switch device is turned on or off by a pulse drive signal. That is, the peak voltage lossless synchronous absorption circuit is composed of a string composed of the first diode Ds1, the third diode Ds3, the bus capacitor Cbus, the fourth diode Ds4 and the second diode Ds2 connected in parallel at both ends of the switching device Q1. A parallel circuit is formed.

[0051] Please refer to Figure 10, the switching device Q1 can be a field effect transistor. The specific conne...

Embodiment 2

[0066] Embodiment 2 of the present invention is improved on the basis of Embodiment 1. Its area lies in that the first diode Ds1 and the second diode Ds2 in the charging circuit, and the diode Ds2 in the one-way discharging circuit At least one of the third diode Ds3 and the fourth diode Ds4 adopts a junction field effect transistor, a bipolar transistor, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, or a V-groove field effect transistor. Transistor replacement, when replacing at least one diode in the charging circuit, the conduction of the junction field effect transistor, bipolar transistor, insulated gate bipolar transistor, metal oxide semiconductor field effect transistor or V-groove field effect transistor The conduction direction is the same as the current direction of the charging loop; when replacing at least one diode in the unidirectional discharging loop, the junction field effect transistor, bipolar transistor, insulate...

Embodiment 3

[0072] The peak voltage lossless synchronous 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 third diode Ds3 and / or the fourth diode Ds4 in the unidirectional discharge circuit Use resistors, inductors or wires instead. When all the wires of the third diode Ds3 and the fourth diode Ds4 are replaced, the discharge circuit is not unidirectional. However, the charging circuit is a symmetrical double diode structure, which has the function of suppressing common-mode interference.

[0073] Please refer to Figure 10 , Figure 22 and Figure 23 , replacing the third diode Ds3 in the unidirectional discharge circuit with the inductor L2 and the resistor R1 respectively. At this time, the inductor L2 and the resistor R1 are connected to form a current loop. In the unidirectional discharge circuit, the distribution of the positional relationship between the various components i...

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PUM

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Abstract

The invention provides a peak voltage lossless synchronous absorption circuit and step-up and step-down switching power supply circuits. The peak voltage lossless synchronous absorption circuit comprises a first diode, a third diode, a bus capacitor, a fourth diode and a second diode connected with a switching device in series; when the switching device is disconnected, the first diode, an absorption capacitor and the second diode form a charging loop; the absorption capacitor, the third diode, the bus capacitor and the fourth diode form a unidirectional charging loop; and the first diode, thethird diode, the bus capacitor, the fourth diode and the second diode form a barrier loop. The circuit enables lossless absorption, can be used to effectively inhibit the peak voltage when the switching device is disconnected, and realizes lossless absorption of the peak voltage and inhibition of common-mode interference.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a peak voltage lossless synchronous absorbing circuit, a step-up switching power supply circuit and a step-down switching power supply 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 supply circuit, due to the parasitic inductance of the wires and even the pins of the switching device, 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...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M3/156
CPCH02M1/32H02M3/156H02M1/322
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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