Frequency-configurable oscillator circuit applied to switching power supply

An oscillator and circuit technology, applied in the direction of electrical pulse generator circuits, logic circuits to generate pulses, electrical components, etc., can solve the problems of limited application scope of external devices, unfavorable internal loop stability, lack of inheritability and flexibility, etc.

Inactive Publication Date: 2016-06-01
BEIJING MXTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the switching frequency of the switching power supply is closely related to the external inductor and capacitor, and needs to be 5 to 10 times the bandwidth of the internal loop, the fixed clock frequency limits the switching frequency of the switching power supply, which limits the scope of application of external devices and does not Facilitates internal loop

Method used

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  • Frequency-configurable oscillator circuit applied to switching power supply
  • Frequency-configurable oscillator circuit applied to switching power supply
  • Frequency-configurable oscillator circuit applied to switching power supply

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Embodiment Construction

[0049] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] The present invention provides a frequency-configurable oscillator circuit applied to switching power supplies, which is an on-chip circuit for generating clock signal CLK and slope signal SLOPE, such as image 3 As shown, it includes a working mode recognition circuit 101, a charging current control circuit 102, a delay circuit 103, a synchronization module 104, and an internal oscillator 105. Three working modes can be realized through external configuration, including fixed frequency mode, adjustable frequency mode, and external Frequency synchronization mode.

[0051] The charging current control circuit 102 judges whether the RT terminal of the external resistor is floating, and sends the resistor floating signal RT_FLOATING to the working mode recognition circuit 101. The input signal SYNC and the resistance floating signal s...

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Abstract

A frequency-configurable oscillator circuit applied to a switching power supply is used for generating a clock control signal and a ramp signal required by a switching power supply circuit and is an on-chip circuit. The frequency-configurable oscillator circuit includes a work module identification circuit, a delay circuit, a synchronization module, a charging current control circuit, and an internal oscillator. The oscillator can automatically generate corresponding control signals through the change of external configuration. The oscillator works in three different work modes which includes a fixed output frequency, an adjustable output frequency, and an external clock synchronization frequency. The oscillator circuit has simple configuration mode and high reliability, suits various configurable oscillator occasions, and satisfies different application demands.

Description

technical field [0001] The invention relates to an oscillator circuit applied to a switching power supply, in particular to an oscillator circuit with three operating modes and configurable frequencies, belonging to the technical field of digital-analog hybrid integrated circuits. Background technique [0002] The power supply is responsible for providing power guarantee for the normal work of various electronic devices. Currently commonly used power supplies are divided into linear regulated power supplies and switching regulated power supplies. The linear regulated power supply has the advantages of high stability, good reliability, and low cost, but it can only step down the voltage, has low energy efficiency, is bulky, and has a large volume. Compared with linear power supply, switching power supply has the following advantages: it can step up and step down, and has high power supply efficiency, but the control circuit and compensation circuit are more complicated. [...

Claims

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Application Information

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IPC IPC(8): H03K3/03H03K4/08
CPCH03K3/0315H03K4/08
Inventor 赵元富王丹辉岳素格莫艳图
Owner BEIJING MXTRONICS CORP
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