Reset circuit for television set switching on and off

A reset circuit and switch machine technology, which is applied in the field of televisions, can solve problems such as poor reliability, abnormal reset operation, and longer reset time, and achieve the effect of ensuring reliability and stable operation

Inactive Publication Date: 2009-08-12
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When Vcc drops slowly, the reset time becomes longer. If there is a sudden power-on or power-of

Method used

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  • Reset circuit for television set switching on and off
  • Reset circuit for television set switching on and off
  • Reset circuit for television set switching on and off

Examples

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Embodiment Construction

[0011] see Figure 4 As shown, a reset circuit for switching on and off the TV in the present invention includes a power-on reset circuit connected to the power supply Vcc, and a power-off reset circuit after power-off. The power-on reset circuit includes a first transistor Q1, a resistor R2 and a capacitor C1 connected between the base of the first transistor Q1 and the power supply Vcc. The collector of the first transistor Q1 is connected to the reset pin REST, and the emitter is grounded; in addition, the collector of the first transistor Q1 is also connected to the power supply Vcc through a resistor R3. The positive pole of capacitor C1 is connected to the power supply Vcc, and the negative pole is connected to resistor R2; in addition, a parallel circuit network composed of diode D1 and resistor R1 is connected between the negative pole of capacitor C1 and the ground, so that capacitor C1 can quickly recover after the power supply Vcc is powered off. Discharge to ensur...

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PUM

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Abstract

The invention discloses a reset circuit for turning on and off a television, which comprises a turn-on power-up reset circuit and a turn-off power-down reset circuit connected with a power supply Vcc, wherein the turn-on power-up reset circuit comprises a first triode Q1, and a resistor R2 and a capacitor C1 connected between a base electrode of the first triode Q1 and the power supply Vcc; and the turn-off power-down reset circuit comprises a second triode Q2, and a capacitor C2 and a resistor R4 connected between an emitter of the second triode Q2 and the power supply Vcc. The reset circuit is provided with the power-down reset circuit, thus the reset circuit is ensured to work normally when the television is turned on and turned off quickly, a system works stably, and the reliability of the system can be ensured well when the circuit works.

Description

【Technical field】 [0001] The invention relates to the technical field of televisions, in particular to a television switch reset circuit for resetting a CPU and a digital logic circuit when the television is turned on and off quickly. 【Background technique】 [0002] Such as figure 1 As shown, the basic function of the current common reset circuit is to provide a reset signal when the system is powered on, and cancel the reset signal after the system power supply is stable. For the sake of reliability, the reset signal must be canceled after a certain delay after the power supply is stable, so as to prevent the power supply from jittering during the opening and closing process of the power switch or power plug, which will cause the reset circuit to work and affect the stability of the system. and figure 2 for figure 1 The input-output characteristic diagram of the RC reset circuit shown, it can be seen that it cannot solve the problems of power glitch (point A) and slow p...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N21/43
Inventor 邓锦扬
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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