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DC-DC converter based on ring oscillator

A technology of DC-DC and ring oscillators, which is applied in the direction of output power conversion devices, instruments, DC power input conversion to DC power output, etc. It can solve the problems of damaged circuits and slow response speed, and achieve simple control circuits. Stability issues, effects of high conversion efficiency

Inactive Publication Date: 2016-04-20
PEKING UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses resistors and capacitors as the feedback network. When the output state changes, its response speed is slow, resulting in a large reverse spike in the output voltage, which may cause the output voltage to become a large value instantaneously, thereby damaging the circuit

Method used

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  • DC-DC converter based on ring oscillator
  • DC-DC converter based on ring oscillator
  • DC-DC converter based on ring oscillator

Examples

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Embodiment Construction

[0024] The present invention will be described in detail below through specific embodiments and accompanying drawings.

[0025] Image 6 It is a specific example of the present invention, and is realized in a CMOS180nm process. This example is a DC-DC converter with heavy load output.

[0026] The comparator in this example is based on the basic two-stage op amp structure. Because the DC-DC converter in this example is designed based on ring oscillator theory, the bandwidth requirement of the comparator is very low. This simplifies its design.

[0027] In this sample driver stage design, a dead time control circuit is added. Avoid simultaneous conduction of PMOS and NMOS to generate large instantaneous power consumption.

[0028] The values ​​of the filter inductor and capacitor used in the DC-DC converter in this example are 4.7μH and 10μF, respectively. This value is comparable to hysteretic DC-DC converters (S.H.Lee, J.S.Bang, K.S.Yoon, S.W.Hong, Ch.S.Shin, M.Y.Jung, ...

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Abstract

The invention relates to a DC-DC converter based on a ring oscillator, and the theory of the ring oscillator is used for realizing the control of the DC-DC converter. The free oscillation of a feedback control loop of the DC-DC converter is utilized by the DC-DC converter for generating a signal for controlling on and off of a switch tube without adding a pulse signal; and the voltage is stably outputted through a comparator. The power consumption generated by a control circuit of the DC-DC converter is low, and the high conversion efficiency can be realized in a wide load range; the control circuit of the DC-DC converter is simple, has no stability problem, and does not need a compensating circuit; the chip area occupied by the DC-DC converter is smaller than the prior art to save cost; and the DC-DC converter has a faster response speed and a smaller ripple than the prior art.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a high-efficiency, small-area DC-DC converter, in particular to a ring oscillator-based DC-DC converter, which uses the ring oscillator theory to realize DC-DC conversion device control. Background technique [0002] In recent years, with the rise of mobile Internet, Internet of Things and medical wearable technologies, low-power mobile and sensing have become more and more popular. In these mobile devices, the power supply efficiency of the battery determines the effective working time, and high-efficiency DC-DC (direct current-direct current) converters are becoming more and more important. Since these devices usually operate at 1V or lower, which is lower than commonly used battery voltages such as 3.7V and 2.5V, step-down DC-DC converters are a current research hotspot. [0003] Traditional DC-DC converters are usually controlled with pulse width modulation (PWM)....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/14
CPCH02M3/158H02M1/143
Inventor 刘军华曲佳萌廖怀林
Owner PEKING UNIV
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