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Method and circuit for testing multiphase balanced current of switching power supply

A technology for testing and verifying circuits, applied in the field of multi-phase current sharing for testing and verifying switching power supplies, which can solve problems such as large errors and difficult implementation, and achieve the effects of fast response, simple design, and simple mathematical logic

Inactive Publication Date: 2018-05-01
ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the method of using DCR to measure the voltage drop across the inductor to judge whether the current is shared will be difficult to implement and the error will become large.

Method used

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  • Method and circuit for testing multiphase balanced current of switching power supply
  • Method and circuit for testing multiphase balanced current of switching power supply
  • Method and circuit for testing multiphase balanced current of switching power supply

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Embodiment 1

[0017] Such as image 3 As shown, in the embodiment of the present invention, the CPU_VCCIN group on the main board of the server is used as an example for illustration. CPU_VCCIN has six-phase output, TDC is 115A, and Imax is 228A. details as follows.

[0018] In the PCB layout stage, place the triodes close to the output inductors so that they correspond one-to-one. In order to avoid the influence of the heat dissipation of adjacent inductors on adjacent triodes, it is recommended to place the triodes at the back end of each inductor. Using the triode as a temperature sensor, the method of judging whether the current is shared by measuring the temperature rise of the inductor is very convenient from the principle and the actual circuit, and realizes accurate current sharing verification with almost no increase in cost.

[0019] Because the layout space on the server motherboard is very tight, if you design complex circuits here simply for testing and verification, it will s...

Embodiment 2

[0023] The method for verifying current sharing described in Embodiment 1 may have some disadvantages. If the space for placing the triode is reserved in the circuit design of the EVT stage, it needs to be deleted in the subsequent DVT and PVT stages to save board space.

[0024] In this embodiment, the triode temperature sensor is separately made into a board. The triode is exposed on the board, which is equivalent to the probe of the temperature sensor, so that it can be in contact with the inductor. If it is made into a separate board, then the peripheral circuit of the triode can be very complicated. For example, the EMI protection circuit can be added to prevent the electromagnetic interference to the triode caused by the inductance. Of course, an ADC module and an LCD screen can be added to make the voltage signal into a readable temperature signal.

[0025] For example, there is enough space to design peripheral circuits on a separate test verification board. Such as...

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Abstract

The invention belongs to the field of switching power supplies, and in particular to a method and circuit for testing the multiphase balanced current of a switching power supply. A triode is used as atemperature sensor to measure temperature rise around each inductor to verify whether balanced current is achieved. The circuit has the advantages of high temperature measurement accuracy, fast response, small size and low price.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a method and circuit for testing and verifying multi-phase current sharing of switching power supplies. Background technique [0002] Current balancing technology has been around for many years, and various current balancing methods have been developed, such as input impedance method, master-slave method, automatic current sharing method according to current size, automatic current sharing method according to thermal stress, and external current sharing controller method. Such as figure 1 Shown is a switching power supply that includes multiple phases. Realizing current balance between multiple phases is the key to realizing a high-power power supply system. Current sharing can ensure the uniform distribution of current stress and thermal stress among modules, and prevent overload or light load (even no-load) of a certain phase after VR (Voltage Regulator, voltage regulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40G01K13/00
CPCG01K13/00G01R31/40
Inventor 宋珂康磊
Owner ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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