KR910008623Y1 - Main power source control circuit - Google Patents

Abstract

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Description

Main voltage control circuit of a TV with a built-in microcomputer

1 is a conventional circuit diagram.

2 is a circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

20: constant voltage generation and status display unit 30: switching control unit

40: main voltage supply control unit

The present invention relates to a main voltage control circuit of a television with a built-in micom, and more particularly, to a main voltage control circuit for a television with a built-in microcomputer for controlling the supply of main voltage according to the output voltage of the microcomputer.

As shown in FIG. 1, the main voltage control circuit of a television with a built-in microcomputer includes a resistor 210-209, a capacitor 210-220, a relay switch 221, 240, a transistor 234-238, Diode 222-225, Reactance 239, Micom Operation Signal Input Terminal 226, Micom Power Supply Terminals 227, 228, Light Emitting Diode 231, Janen Diodes 241, 242, Main Power Supply Terminal 229 230, and AC power input terminals 232 and 233, respectively.

Referring to FIG. 1, the main voltage control circuit of a conventional television is briefly described. When the relay switch 221 is turned "on" by the user, the AC power through the AC power input terminals 232 and 233 is bridged diode 222. After being full-wave rectified by -225, the signal is input to an integrator composed of a resistor 208 and a capacitor 217 to be a DC signal of a constant level.

The DC signal of the constant level is applied to the collector and the base of the transistor 238 and simultaneously to the collector of the transistors 235, 236, and 237 through the resistor 206.

Accordingly, the transistor 238 outputs a DC signal of a predetermined level input to the collector to the microcomputer power supply terminal 227 through an emitter, and to the collector terminal and the light emitting diode 231 of the transistor 234.

At this time, a predetermined " high " signal supplied when the microcomputer (not shown) is operated through the microcomputer operation signal input terminal 226 is applied to the bases of the transistors 234.

In this case, since the transistor 234 is switched by the “high” signal input to the base, the transistor 234 inputs a “low” signal applied to the collector to the base of the transistor 235 and correspondingly, the transistor 235. ) Is " off " to output a DC signal of a constant level input to the collector stage to the base of the transistor 236.

The transistor 236 is switched by the "high" signal input to the base and outputs a DC signal of a constant level input to the collector stage to the base terminal of the transistor 237 through the emitter stage.

At this time, the transistor 237 is switched by the "high" signal inputted to the base stage, and outputs a constant level DC signal inputted to the collector stage to the main power supply terminal 228 of the television through the emitter stage and at the same time reactance 239. ) Here, the transistors 236 and 237 are constituted by Darlington connections.

In addition, since the relay switch 240 is switched by the magnetization of the reactance 239, the signal amplified by the reactance 239 is output to the main power transformer (not shown) through the main power supply terminals 229 and 230. As described above, the main power supply control circuit of a conventional television is a relay driving circuit system for supplying and cutting off the main power supply of a device. As a result, a multi-arlington connection circuit, a transistor, and other elements are complicated, the area occupied on the PCB board is large, and thus the cost of the product is increased. There has been a problem that rise factors occur.

Therefore, the purpose of the present invention is to control the voltage supplied to the main voltage of the TV according to the output voltage of the computer by using a simple switching means can reduce the area of the circuit occupied on the PCB board and reduce the cost of the product The present invention provides a main power supply control circuit for a television.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram according to the present invention, in which 20 is a resistor 21, 25, 27, capacitors 22, 44, 29, a light emitting diode 26, and a first voltage regulator 23. A constant voltage generation and status display unit for outputting the first constant voltage of the predetermined level generated by integrating filtering and constant voltage of the predetermined rectified voltage through the microcomputer voltage supply terminal 1 and displaying the same for the user to recognize. (20) and an operation of the microcomputer to integrally filter a predetermined rectified voltage through the rectified voltage input terminal 10 and input the first constant voltage and the microcomputer output terminal 2 of the constant voltage generation and status display unit 20. Switching control unit 30 is switched in accordance with the signal to control the output of the integrated filtered rectified voltage, and the rectified voltage through the rectified voltage input terminal 10 is switched in accordance with the integrated rectified voltage of the switching control unit 30 Integral filtering and power outage Screen is configured by the second positive voltage of a predetermined level to generate the main voltage supply control unit 40 and outputting the main voltage supply terminal (3) of the television.

The constant voltage signal generation and status display unit 20 of the configuration includes a resistor 21 and a capacitor 22, the first integrating means for integrating the rectified voltage of the rectified voltage input terminal 10 firstly; A first constant voltage means for inputting the rectified voltage integrated by the integrating means to generate a first constant voltage, and a resistor 25 and a light emitting diode 26 so that a user can recognize the output state of the first constant voltage. And a second integrating means composed of a light emitting display means for emitting light and a resistor 27 and a capacitor 29 for integrating the first constant voltage once again and outputting it to the microcomputer power supply terminal 1. 30 is composed of a resistor 28 and a capacitor 39, the third integrating means for integrating the rectified voltage of the rectified voltage input terminal 10, resistors 28, 33, 34, diodes 35, 36 And 37) and transistors 31 and 32 to input the first constant voltage to output the microcomputer output. And a first switching means for switching and controlling the output of the rectified voltage integrated in the third integrating means by the operation signal of the microcomputer inputted through the ruler (2), wherein the main voltage supply control unit 40 includes a resistor 42 , 43, 44, reactance 41, capacitors 46, 47, and SCR (Sillicon Controlled Rectifier) (hereinafter referred to as “SCR”) 45 to switch according to the switching control signal of the switching controller 30. And a second switching means for outputting the rectified voltage input through the rectified voltage input terminal 10, a resistor 43, and a capacitor 48 to integrate the rectified voltage switched by the second switching means. Four integrating means, a fuse 49 in which the voltage integrated in the fourth integrating means is temporarily interrupted by overvoltage, and a rectified voltage through the fuse 49 is generated as a second constant voltage at a predetermined level to supply a main voltage supply terminal. And a second constant voltage means for outputting to (3).

Hereinafter, the present invention will be described in detail with reference to FIG. 2.

When the rectified voltage generated by rectifying a predetermined AC power is input through the rectified voltage input terminal 10, the rectified voltage is simultaneously applied to one side of the resistor 21, the resistor 38, and the reactance 41. In addition, the resistor 21 and the capacitor 22 integrate the rectified voltage input, filter the filter to a predetermined level, and output the same to the first voltage regulator 23. As a result, the first voltage regulator 23 generates a constant voltage according to the input of the integrated rectified voltage and outputs the constant voltage to the light emitting diodes 26 through the resistor 25 and at one end of the resistors 27 and 28. Output The resistor 27 and the capacitor 29 integrally filter the input constant voltage once again and output it to the microcomputer voltage supply terminal 1.

At this time, when the microcomputer operation signal, that is, the "high" signal is input through the microcomputer output terminal 2, the "high" signal is impedance-matched by the resistors 33 and 34 and then input to the base terminal of the transistor 31. do. Therefore, it inputs to the base end of the transistor 31.

Therefore, the transistor 31 discharges the first constant voltage input to the collector through the resistor 28 and the diode 35 to the emitter. Therefore, the diode 36 connected to the collector end of the transistor 31 outputs a "low" signal to the base end of the transistor 32. This causes the transistor 32 to be "off". And the rectified voltage integrated by the resistor 38 and the capacitor 39 is gated to the gate terminal G of the SCR 45 through the diode 37 and the resistor 44 by "off" of the transistor 32. The SCR 45 is " on "

Here, the diodes 35 and 36 between the resistor 28 and the transistor 32 are for preventing the reverse voltage.

Meanwhile, the rectified voltage through the reactance 41 and the SCR 45 is integrally filtered by an integrator made of the resistor 43 and the capacitor 48 and then input to the second voltage regulator 50 through the fuse 49. .

The second constant voltage generator 50 inputs the integrated constant voltage to generate a second constant voltage of a predetermined level, and is then supplied to the television (not shown) through the main power supply terminal 3.

On the other hand, if the microcomputer operation signal is not input through the microcomputer output terminal 2, that is, the "low" signal is input, the "low" signal is input to the base of the transistor 31, and thus the transistor 31 is "off". . Accordingly, since the collector of the transistor 31 is in a "high" state, a first constant voltage through the resistor 28 and the diodes 35 and 36 is input to the base of the transistor 32. The transistor 32 is " on " to discharge the rectified voltage input to the collector through the rectified voltage input terminal 10 and the resistor 38 to the emitter. Therefore, the SCR 45 is " off " by the " low " signal input to the gate terminal G to block the voltage input to the main voltage supply terminal 3 of the television.

As described above, by controlling the voltage supplied to the main voltage of the television according to the output voltage of the computer by a simple switching means, it is possible to reduce the area of the circuit occupying the PCB board and reduce the cost of the product.

Claims (4)

In the main voltage control circuit of a television with a built-in microcomputer, the first constant voltage generated by integrating filtering and constant voltage of the predetermined rectified voltage of the rectified voltage input terminal 10 is outputted to the microcomputer voltage supply terminal 1. At the same time, the constant voltage generation and status display unit 20 for displaying the user's recognition and the predetermined rectified voltage through the rectified voltage input terminal 10 are integrally filtered and the first constant voltage of the constant voltage generation and status display unit 20 is displayed. And a switching controller 30 which is switched according to the operation signal of the microcomputer input through the microcomputer output terminal 2 to control the output of the integrated filtered rectified voltage signal, and to the integrated rectified voltage of the switching controller 30. The main voltage supply terminal 3 of the television is switched according to the second constant voltage of a predetermined level generated by integrating filtering and rectifying the rectified voltage through the rectified voltage input terminal 10. Circuit, characterized by consisting of a main voltage supply control unit 40 for outputting. The method of claim 1, wherein the constant voltage generation and status display unit 20 is integrated by the first integration means and the first integration means for firstly integrating the rectified voltage input through the rectified voltage input terminal 10; A first constant voltage means for inputting a rectified voltage to generate a first constant voltage, light emitting display means for emitting a light so that a user can recognize an output state of the first constant voltage, and integrating the first constant voltage once again, the microcomputer power supply A main voltage control circuit for a television with a built-in computer, characterized by comprising a second integrating means for outputting to a supply terminal (1). According to claim 1, wherein the switching control unit 30 is the third integrating means for integrating the rectified voltage, by the operation signal of the microcomputer inputs the first constant voltage signal through the microcomputer output terminal (2) And a first switching means for switching and controlling the output of the rectified voltage integrated in the third integrating means. According to claim 1, wherein the main voltage supply control unit 40 is switched as the integrated rectified voltage of the switching control unit 30 is switched to the second switching means for outputting the rectified voltage, and the second switching means A fourth integrator means for integrating the rectified voltage through the second constant voltage means for generating a rectified voltage integrated in the fourth integrator means as a second constant voltage at a predetermined level and inputting it to the main voltage control terminal 3 of the television. The main voltage control circuit of the TV.