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Unisolated switch DC-DC power supply module, power supply device and communication device

A technology of DC power supply and power module, applied in the direction of converting DC power input to DC power output, output power conversion device, electrical components, etc., which can solve the problems of reduced circuit efficiency, increased switching loss of MOS tubes, and reduced MOS tubes, etc. , to avoid the reduction of circuit efficiency, avoid the reduction of duty cycle, and avoid the effect of increasing switching loss

Active Publication Date: 2007-12-19
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, the input voltage required by loads such as CPUs has become lower and lower. According to the above formula (1), if a lower output voltage is to be provided in the above power supply circuit, the MOS transistor needs to be reduced when the input voltage is fixed. The duty cycle of the MOS tube is shortened, that is, the conduction time of the MOS tube is shortened, which will increase the switching loss of the MOS tube and reduce the efficiency of the circuit.
[0006] In addition, in the prior art, the operating frequency of the MOS tubes in each phase of the Buck circuit is relatively high, resulting in large switching losses and driving losses of the MOS tubes, which further reduces the efficiency of the circuit

Method used

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  • Unisolated switch DC-DC power supply module, power supply device and communication device
  • Unisolated switch DC-DC power supply module, power supply device and communication device
  • Unisolated switch DC-DC power supply module, power supply device and communication device

Examples

Experimental program
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Embodiment 1

[0021] Embodiment 1. A non-isolated switch DC-DC power supply module, referring to FIG. 2 , includes a PWM generator 100, a voltage stabilization conversion circuit group 200 and a pre-stage pre-regulation conversion circuit 300;

[0022] The pre-stage pre-stabilization conversion circuit 300 includes a pair of MOS transistors 301 and 302, an inductor 310 and a capacitor 320; the drain of the MOS transistor 301 is connected to the power terminal V of the power module DD connection; the drain of the MOS transistor 302 is connected to the source of the MOS transistor 301, and its source is connected to the ground; one end of the inductor 310 is connected to the capacitor 320, and the other end is connected to the source of the MOS transistor 301 and the drain of the MOS transistor 302 polar coupling connection; the capacitor 320 is connected between the inductor 310 and ground;

[0023] The structure of each voltage-stabilizing conversion circuit in the voltage-stabilizing conve...

Embodiment 2

[0027] Embodiment 2. A non-isolated switch DC-DC power supply module. Referring to FIG. 4, this embodiment is basically the same as Embodiment 1, the main difference is that in this embodiment, each voltage regulator in the voltage stabilization conversion circuit group The conversion circuit outputs separately to form a multi-channel voltage-stabilizing conversion circuit, which can supply power to multiple loads respectively; similar to Embodiment 1, the PWM generator can also configure each voltage-stabilizing conversion circuit to work in different phases with each other through the corresponding PWM signal , and can configure the switching frequency of the MOS tube in each voltage-stabilizing conversion circuit to be N divided by the switching frequency of the MOS tube in the pre-stage pre-stabilizing conversion circuit, and make the conduction state of the MOS tube in each voltage-stabilizing conversion circuit Alternately synchronizing with the conduction state of the MO...

Embodiment 3

[0028]Embodiment 3. A non-isolated switch DC-DC power supply module. Referring to FIG. 5, this embodiment is basically the same as Embodiment 1, the main difference is: in this embodiment, there are some stabilizing The voltage conversion circuit forms a multi-phase voltage stabilization conversion circuit and then outputs, thus forming a multi-phase multi-channel voltage stabilization conversion circuit; similar to Embodiment 1, the PWM generator can also configure each voltage stabilization conversion circuit in different phases through the corresponding PWM signal. It works under the following conditions, and can configure the switching frequency of the MOS transistors in each circuit to be the N frequency division of the switching frequency of the MOS transistors in the pre-stage pre-stabilization conversion circuit, and make the conduction state of the MOS transistors in each voltage stabilization conversion circuit Alternately synchronizing with the conduction state of th...

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Abstract

This invention discloses a DC-DC supply module with a non-separated switch including: a PWM generator and a voltage-stabilizing transforming circuit with a pair of transistors connected in couple, said PWM generator outputs a pair of PWM signals to control the switch of on or off of the pair of transistors to reduce the input voltage of the supply module and output it, in which, a prime pre-stabilizing transforming circuit is set between the terminal of the supply module and the transforming circuit used in carrying out prime reduction of the input voltage of the supply module controlled by the PWM signal output by the generator. This invention also discloses a supply device and a communication device.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to the non-isolated switch DC-DC power supply technology. Background technique [0002] With the continuous improvement of the integration and processing speed of VLSI such as CPU, how to design a non-isolated low-voltage high-current switching DC-DC (DC-DC) conversion power supply with a wide range of voltage input and high efficiency has become a key issue in the design of power supply circuits. One of the main tasks. Figure 1 shows a structure diagram of a non-isolated low-voltage high-current switching DC-DC conversion power supply circuit in the prior art, which includes a pulse width modulation (Pulse Width Modulation, PWM for short) generator and a multi-phase synchronous rectification step-down Voltage regulator conversion circuit (Buck circuit), the PWM generator outputs a PWM signal to control a pair of metal-oxide-semiconductor field effect transistors (...

Claims

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Application Information

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IPC IPC(8): H02M3/07
CPCH02M2001/007H02M3/158H02M2001/008H02M1/007H02M1/008
Inventor 李成勇
Owner HUAWEI DIGITAL POWER TECH CO LTD