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A power management chip based on cot control two-phase buck circuit with current sharing function

A power management chip and circuit technology, applied in control/regulation systems, high-efficiency power electronic conversion, output power conversion devices, etc., can solve problems such as bad limit cycles, area waste, energy loss, etc.

Active Publication Date: 2018-05-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, digital control inevitably introduces quantization errors, leading to undesirable limit cycles; moreover, high-precision DC converters operating at very high switching frequencies require high-resolution and high-speed digital PWM generators and analog-to-digital converters , which in turn leads to energy loss and area waste

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  • A power management chip based on cot control two-phase buck circuit with current sharing function
  • A power management chip based on cot control two-phase buck circuit with current sharing function
  • A power management chip based on cot control two-phase buck circuit with current sharing function

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Embodiment Construction

[0034] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 2 As shown, the power management chip of the present invention is used in a large current Buck circuit occasion, and it is provided with a power input pin (V in ), the output voltage pin (V O ), ground pin (GND), and two switch SW pins (SW 1 and SW 2 ). There are reference circuit module, comparator module, voltage loop module, clock generation module, control logic and soft start module, constant on-time generation module, ripple compensation module, current sampling module and current equalization module inside the chip. Driver module and four on-chip switches Mp 1 , Mp 2 and Mn 1 , Mn 2 .

[0036] Power input pin (V in ), connected to each module in the chip to generate a power supply potential for the normal operation ...

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Abstract

The invention discloses a COT-based power supply management chip controlling a two-phase Buck circuit with a current equalizing function, which is provided with a power supply input pin, an output voltage pin, a ground pin, and two switch SW pins. Chip internal reference circuit module, comparator module, voltage loop module, clock generation module, control logic and soft start module, constant on-time generation module, ripple compensation module, current sampling module, current balance module, drive module and four On-chip switch tube. The power management chip of the present invention can efficiently overcome a variety of asymmetrical factors to achieve current balance, has high precision, can work at a high switching frequency, and has less energy loss compared with the traditional method of digital control matching duty cycle. Occupies less area.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a power management chip for controlling a two-phase Buck circuit with a current sharing function based on a COT. Background technique [0002] The power management chip is a chip that manages the power consumption of each module in the system, and some power management chips will be used for switching power supply circuits. A switching power supply circuit is broadly defined as a circuit that uses a semiconductor power device as a switch to change the power supply form into another form, and automatically controls the closed-loop stable output and has a protection link during the change. A switching power supply circuit generally includes a control chip and peripheral circuits. The common topologies of switching power supply circuits are: buck chopper (Buck), boost chopper (Boost), flyback, forward, half bridge and full bridge. The control methods of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157H02M3/158H02M1/088H02M1/14
CPCH02M1/088H02M1/143H02M3/157H02M3/1584H02M1/0058H02M3/1586Y02B70/10
Inventor 赵梦恋张书瑜朱波秦政杨艺丹董阳涛吴晓波
Owner ZHEJIANG UNIV
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