KR20040067667A - Circuit for separating power part of tv-phone - Google Patents

Abstract

PURPOSE: A circuit for separating a power unit of a TV phone is provided to separate power of a general circuit unit from power of a caller ID circuit, and to transmit output data of the caller ID circuit to a CPU through a photo coupler, thereby removing a noise problem. CONSTITUTION: An EMI(Electromagnetic Interference) filter(21) prevents an EMI. A rectifier and filter portion(22) rectifies/filters an output voltage of the EMI filter(21). A switching circuit(23) switches the output voltage at a predetermined frequency, and drives a transformer(24). Rectifier and filter portions(25,26) rectify/filter the output voltage, and output a driving voltage and a DC voltage from a caller ID data converter. A main controller(27) controls the switching circuit(23) in PWM method. An excessive power protector(28) prevents an excessive power. A power separator(29) performs a power separation process.

Description

TV Power Supply Separation Circuit {CIRCUIT FOR SEPARATING POWER PART OF TV-PHONE}

The present invention relates to a technology for separating and using a power supply unit in a television, and in particular, the power supply of the general circuit unit and the power of the caller ID circuit can be separated and output the output data of the caller ID circuit in an electrically insulated form. It is related to the power supply separation circuit of the TV.

The TV phone, which has many functions such as TV, radio, telephone, and home auto, can be rotated up, down, left, and right, so that it can be watched in any position in the kitchen. Ultra-thin high definition liquid crystal color and A / D converter are built in Create vivid digital images.

You can listen to FM as well as AM in stereo, and the automatic tuning function makes it easier to tune the desired channel.

You can make and receive calls at any time using the hands-free function without the need for a handset, and there is a redial function and the recording and playback functions of one-touch buttons.

However, in the conventional TV, there is a problem in that noise is mixed in data because the power supply unit for driving a general electronic circuit and the power supply unit for driving the caller ID data conversion unit do not maintain an electrically insulated state. In addition, since the output terminal of the caller ID data conversion unit and the input terminal of the central processing unit are electrically connected, there is a problem that adversely affects.

Accordingly, an object of the present invention is to provide a power supply separating circuit of a TV phone that separates a power supply of a general circuit unit and a power supply of a caller ID circuit and transmits output data of the caller ID circuit to a central processing unit through a photocoupler. .

1 is a block diagram of a television according to the present invention.

2 is a block diagram of a power disconnect circuit according to the present invention;

FIG. 3 is a detailed circuit diagram of the rectifier and filter unit in FIG. 2. FIG.

4 is a data format diagram between ringer signals.

5 is a data output path diagram of a caller ID data conversion unit.

*** Description of the symbols for the main parts of the drawings ***

11: Hands Free Calling Unit 12: Caller ID Data Conversion Unit

13 tuner 14 central processing unit

15: power amplifier 16: LCD

17: fluorescent display panel

1 is an overall block diagram of a TV to which a power supply separating circuit of the present invention is applied, as shown in the figure, a hands-free call unit 11 for providing a hands-free call function; In providing the caller information to the central processing unit 14, Caller ID data conversion unit 12 for providing in an electrically insulated form through the photocoupler; A tuner unit 13 for receiving a TV radio (AM / FM) broadcast; A central processing unit (14) for overall control of each part of the system; A power amplifier 15 for outputting an audio signal to the speaker SP; An LCD 16 and a fluorescent display panel 17 for displaying a TV program or caller information are configured.

2 is a block diagram of a power separation circuit according to the present invention, as shown therein, to prevent the generation of electromagnetic interference (EMI: Electromagnetic Interference) by removing the electromagnetic wave contained in the AC power supply (AC 110 / 220V) EMI filter 21; A rectifier and filter unit 22 for rectifying and filtering the output voltage of the EMI filter 21; A switching circuit part 23 for driving the transformer 24 by switching the output voltage of the rectifying and filter part 22 to a predetermined frequency; Rectifying and filtering the voltage output through the transformer 24 to output the driving voltage (+ 5V) and DC voltage (+ 4.5V, -27V, + 12V) of the caller ID data converter, respectively. 25), 26; A main controller 27 for controlling the switching circuit unit 23 in a pulse width modulation (PWM) manner; An overpower protection unit 28 for preventing overpower from being supplied; It will be described in detail with reference to Figures 3 to 5 attached to the operation of the present invention configured as configured as a power separation unit 29 for power separation as follows.

When the user inputs a key signal for tuning, the central processing unit 14 controls the tuning operation of the tuner 13 according to the key signal to receive a TV broadcast signal or a radio broadcast signal of the corresponding channel. The received broadcast video signal is displayed on the LCD 16 through a predetermined process, and the audio signal is also output to the speaker SP through the power amplifier 15 after a predetermined process.

The hands-free call unit 11 provides a hands-free call function so that a user can make a call freely without using a separate handset, and the caller ID data extracted from the caller ID data conversion unit 12 includes the LCD ( 16) or on the fluorescent display panel 17.

Meanwhile, the operation of the power separation circuit according to the present invention will be described with reference to FIGS. 2 and 3.

The input AC power source AC 110 / 220V is transferred to the rectification and filter unit 22 through the EMI filter 21 to be converted into a DC voltage of a predetermined level, and the switching circuit unit 23 is the rectification and filter unit 22. The output voltage is switched to a predetermined frequency to drive the transformer 24. For reference, the switching circuit unit 23 is controlled by the pulse width modulation (PWM) method by the main controller 27.

At this time, the rectifier and filter unit 25 rectifies and smoothes the output voltage of the transformer 24 with the diode D1 and the capacitor C1, and filters the predetermined voltage (5V, GND) by filtering the coil L1. Supply is performed at the drive voltage of the ID data converter 12. In the rectifier and filter unit 26, the output voltage of the transformer 24 is rectified and smoothed by a diode D2 and capacitors C2 and C3, and filtered by a coil L2.L3 to a predetermined voltage (+ 12V). , + 5V, COM) is supplied as the DC voltage of the general circuit part.

On the other hand, Fig. 4 shows the output data format of the caller ID data converter 12 when the ringer signal is transmitted through the trunk line (telephone station). However, in the present invention, when the output data of the caller ID data conversion unit 12 is transmitted to the central processing unit 14, it is not transmitted through a wired path but through the photocoupler 12A as shown in FIG. Therefore, between the output terminal of the caller ID data conversion unit 12 and the input terminal of the central processing unit 14 is maintained in an electrically insulated state.

The central processing unit 14 receives the caller's information (ID DATA) and the like from the caller ID data conversion unit 12 through the above path and analyzes the display mainly on the LCD 16, but displays a brighter display. If is required is displayed on the fluorescent display panel (17).

As described in detail above, the present invention separates the power of the general circuit unit and the power of the caller ID circuit from the TV, and transmits the output data of the caller ID circuit to the central processing unit through the photocoupler, thereby preventing noise inflow. There is a fundamental resolution.

Claims (2)

A television provided with radio, TV broadcasting, and telephone function, comprising: a caller ID data conversion unit for transmitting caller information received through a trunk line to a central processing unit through a photo coupler; A switching circuit unit for driving a transformer by switching a DC voltage at a predetermined frequency; Rectifying and filtering the voltage output through the transformer, the TV comprising a first rectification and filter unit and a second rectification and filter unit for outputting the driving voltage and DC voltage of the caller ID data conversion unit, respectively Power supply disconnect circuit. The method of claim 1, wherein the first rectifying and filter unit is configured to output a driving voltage (+ 5V, GND), the second rectifying and filter unit is configured to output a DC voltage (+ 4.5V, -27V, + 12V) Power supply separation circuit of the TV.