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Delay circuit and switching power controller with delay circuit

A technology of delay circuit and current source, applied in electronic switches, electrical components, pulse technology, etc., can solve the problems of limited delay time and inability to flexibly control fault protection, and achieve the effect of extending the delay time.

Inactive Publication Date: 2012-01-25
SHENZHEN LII SEMICON CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that using the existing delay circuit structure, the delay time is limited, and the fault protection cannot be flexibly controlled, so it is necessary to improve

Method used

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  • Delay circuit and switching power controller with delay circuit
  • Delay circuit and switching power controller with delay circuit
  • Delay circuit and switching power controller with delay circuit

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Embodiment Construction

[0022] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0023] The delay circuit of the present invention uses a counter to perform multiple cycles of the delay circuit, see image 3 , on the basis of the existing single-delay circuit, the counter U2 is added. Every time the comparator U1 outputs a high level, U2 counts up by 1. When U2 counts to the specified number of times n, Qn outputs a high level. If the fault still occurs at this time, the Implement protection. The total delay time is: .

[0024] The delay circuit of the present invention can be further provided with a function setting unit, which includes a second current source, and the second current source can be connected with a function setting element in parallel with the first current source, which can A variety of different functions are realized by connecting different external components on the same pin of the integrated circuit.

[0025] see Figur...

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PUM

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Abstract

The invention discloses a delay circuit and a switching power controller with the delay circuit. The delay circuit comprises a comparator, a delay setting unit and a counter, wherein the comparator comprises two input ends, one of which is connected with a set reference level; the delay setting unit is connected with the other input end of the comparator and comprises a first capacitor, a first current source and a discharge switch; the first current source is in matched connection with a charging capacitor, namely the first capacitor; the discharge switch is under the control of the output of the comparator; and the counter counts output pulses of the comparator. By the invention, the supportable delay time of the delay circuit can be greatly prolonged, and the functions of the switching power controller can be expanded with the minimum resources.

Description

technical field [0001] The invention relates to a circuit structure of a switching power supply, in particular to the structure of a delay circuit in an AC-DC switching power supply integrated circuit. Background technique [0002] Existing AC-DC switching power supply integrated circuits, such as the LN3C63 high-performance AC / DC switching power supply controller provided by Lishengmei, see figure 1 , which roughly includes: a power management module; and an oscillator, a feedback and control module, a PWM module and a drive module connected with the power management module. The oscillator, the feedback and control module, the PWM module and the drive module are connected in series, the oscillator is connected to the pin 3 of the integrated circuit, and an external resistor can be used to adjust the period of the oscillation pulse. When fault protection is required, it is usually necessary to perform a delayed response to the fault to accurately judge the fault and avoid m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/28
Inventor 张杰郑凌波周勇
Owner SHENZHEN LII SEMICON CO LTD
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