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Power sensor circuit

A technology of power supply detection and power supply voltage, which is applied in the direction of TV, electrical components, color TV, etc., and can solve problems such as damage to power amplifiers, damage, improper amplification of signals by preamplifiers or power amplifiers, etc.

Inactive Publication Date: 2000-04-19
THOMSON CONSUMER ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a digital convergence IC may generate an inappropriate waveform that may damage or destroy a power amplifier because the power amplifier is inductively loaded and generates excessive heat due to an abnormal signal such as a signal with a DC component
[0005] Also, if either of the +15V or -15V supply voltages are disturbed while the IC is being supplied with a +5V input and is providing a correction signal to the preamplifier, undesired results may cause the preamplifier or power amplifier to Generates an unsuitably amplified signal that could damage or destroy power amplifiers or other components of the convergence system

Method used

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Embodiment Construction

[0009] Detailed Description of Preferred Embodiments

[0010] Referring to FIG. 1 , there is shown a block diagram of a convergence system 100 including a power detection circuit 150 according to the present invention. The convergence system 100 includes a power supply 105 , a voltage regulator 108 , a power supply detection circuit 150 , a digital convergence IC 110 , a preamplifier 121 , and a power amplifier 122 . In the present invention, the power detection circuit 150 enables the digital convergence IC 100 to start only when the relevant power supply voltage is provided at an appropriate level.

[0011] As mentioned above, digital convergence IC 110 generates a correction signal for correcting vertical pincushion and other distortions. The correction signal is conditioned by preamplifier 121 to provide a filtered or processed correction signal which is then amplified by power amplifier 122 to provide an amplified output correction signal voltage at a pin labeled "OUT". ...

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Abstract

A power sensor circuit (150) for use in a convergence system which comprises a convergence circuit (110) for generating a convergence correction signal. The power sensor circuit (150) receives at least one supply voltage and generates an output signal (Vout) having a magnitude selected in accordance with whether the at least one supply voltage is above a first threshod. The output signal (Vout) is coupled to the convergence circuit (110), which enables or disables the convergence correction signal in response to the magnitude of the output signal (Vout).

Description

Background of the invention [0001] This invention relates to power detection circuits, and more particularly to power detection circuits for use with digital convergence systems for use with cathode ray tubes. [0002] Electronic components such as integrated circuits (ICs) and amplifiers are often connected with power supply devices that supply different supply voltages to these components. According to the characteristics of these electronic components, when the power supply equipment fails for some reason, the electronic components receiving the power supply voltage from the power supply must be affected, which may lead to undesired results. [0003] For example, in a television system such as a projection television cathode ray tube (CRT) system, there are typically three CRT units, each representing a color red, green, and blue. In order to correct a display artifact known as vertical pincushion distortion, a convergence system is used to provide a convergence correction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/63H04N9/28
CPCH04N9/28H04N5/63
Inventor J·B·乔治
Owner THOMSON CONSUMER ELECTRONICS INC