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Switching power supplies and controllers and oscillators used therein

A technology of oscillators and switching tubes, applied in the field of controllers and oscillators

Active Publication Date: 2018-05-22
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by the delay Td, it is difficult for the frequency f of the oscillator to match its theoretical value
For high frequency oscillators (such as 2.2MHz), the adverse effect is more significant

Method used

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  • Switching power supplies and controllers and oscillators used therein
  • Switching power supplies and controllers and oscillators used therein
  • Switching power supplies and controllers and oscillators used therein

Examples

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0023] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The switching power supply and the controller and oscillator used in it.This oscillator includes: current source; capacitors, with the first and second ends, the first end is coupled to the current source, and the second end is coupled to the reference place; the first switch isThe end and control terminal, the first end is coupled to the first end of the capacitor, and the second end is coupled to the reference place; the error amplifier, the coupling to the first end of the capacitor, is based on the voltage of the reference voltage and the voltage of both the capacitor to generate adjustment.The comparator, the output end is coupled to the control terminal of the first switch. The single -touch circuit is based on a comparative signal and generates a trigger signal on the output end.

Description

technical field [0001] This invention relates to electronic circuits, and more particularly to controllers and oscillators for use in switching power supplies. Background technique [0002] In switching power supplies, the oscillator is usually composed of a figure 1 The shown current source I1, capacitor C1, switch tube S1, comparator COM1 and one-shot circuit constitute. The current source I1 charges the capacitor C1. The comparator COM1 compares the voltage Vc1 across the capacitor C1 with the reference voltage Vref, and when the voltage Vc1 increases to the reference voltage Vref, the one-shot circuit outputs a pulse to discharge the capacitor C1 through the switch tube S1. [0003] Theoretically, the frequency f of the oscillator is jointly determined by the reference voltage Vref, the current source I1 and the capacitor C1. However, due to the inherent delay Td in the comparator COM1, such as figure 2 As shown, when the voltage Vc1 increases to reach the reference...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H03K4/12
CPCH02M1/00H03K4/12H02M1/0003H03K3/0231H03K4/502H02M1/08H03B5/04H03B5/24
Inventor 许力
Owner CHENGDU MONOLITHIC POWER SYST