JP2000125228A - Power output controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time till an image is outputted by detecting a voltage rise of a power supply of a SW transformer secondary side when a SW of a television receiver is closed to control the timing of power supply to each circuit and of data communication thereby surely and accurately preventing malfunction of each circuit and destruction of components. SOLUTION: A voltage detection circuit 6 detects a voltage rise at a secondary side of a SW transformer when a power SW is closed and gives the detected voltage to a microcomputer 8. The microcomputer 8 gives an ON signal to a constant voltage circuit 7 when the microcomputer 8 detects a voltage required for the constant voltage circuit 7, which applies a voltage to a deflection control circuit 9. After the deflection control circuit 9 receives the required voltage, the microcomputer 8 starts data communication to the deflection control circuit 9. Then the microcomputer 8 gives the ON signal to a high voltage on/off circuit 11, which applies a high voltage to a deflection output circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, which detects a rising voltage of a power supply on a secondary side of a SW transformer when a switch is turned on, and controls power supply to each circuit and timing of data communication. The present invention relates to a power supply output control device which more reliably and accurately prevents a malfunction of a circuit and destruction of components, and shortens a time until an image is displayed.

[0002]

2. Description of the Related Art In order to prevent malfunction of a signal processing circuit and destruction of deflection output circuit components, a conventional television receiver supplies power to each circuit and outputs data and data after a certain period of time from the output of an AC relay on signal from a microcomputer. Communicating. As a conventional technique for preventing destruction of a deflecting component, for example, a configuration disclosed in Japanese Unexamined Patent Application Publication No. 6-90370 shown in FIG. 3 has been proposed.

In FIG. 3, after the power is turned on, the horizontal deflection output transistor 1 is operated until the device reaches a stable operation state.
4 is prevented from being destroyed. The protection circuit 17 directly applies the voltage of the output terminal 19 of the first power supply circuit 13 to the plus input terminal of the comparator 18, applies the voltage to the minus input terminal via the resistor 20, and connects the voltage between the minus input terminal and the ground. Capacitor 2
1 are connected. The output of the comparator 18 is
While the potential of the capacitor 21 is charged up to the voltage of the output terminal 19, it is at a high level, and thereafter becomes a low level. While the output of the comparator 18 is at a high level, the diode 2
2 is conducted, a control current is added to the control terminal 16 via the resistor 23, and the supply voltage of the second power supply circuit 15 is controlled.

[0004]

However, the power supply rise time on the secondary side of the SW transformer varies depending on the AC input voltage and the state of the residual charge in the power supply circuit capacitor when the SW is turned off. Therefore, the time until the supply of power supply voltage to each circuit and the data communication were set in consideration of the worst case.However, it is not reliable enough to prevent the malfunction of the circuit and the destruction of parts, and the time until image output is not enough. Was getting longer.
Further, the conventional technology for preventing the destruction of the deflecting component has a complicated circuit configuration with a large number of circuit components.

The present invention relates to a television receiver, comprising:
When W is turned on, the voltage of the rise of the power supply on the secondary side of the SW transformer is detected, and the timing of power supply to each circuit and the timing of data communication are controlled, thereby controlling the variation in the rise time of the power supply on the secondary side of the SW transformer. In addition, the present invention relates to a power supply output control apparatus which aims to prevent a malfunction of a circuit and destruction of components more reliably and accurately with a simple circuit configuration and to shorten a time until an image is displayed.

[0006]

In order to achieve the above object, a power output control device according to the present invention has the following configuration.
Means for detecting the voltage at the rising edge of the power supply on the secondary side of the SW transformer when the SW is on, means for detecting that the input voltage required for the constant voltage circuit has been reached, and means for supplying power to each circuit , Means for starting data communication.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a television receiver, which detects a rising voltage of a power supply on a secondary side of a SW transformer when a SW is turned on, and controls power supply to each circuit and timing of data communication. By doing so, the malfunction of the circuit and the destruction of the components can be prevented more accurately and accurately, and the time until image output can be shortened.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG.
An input unit, 2 is a relay circuit for turning on / off an AC supplied to a power supply, 3 is an AC rectifier, 4 is a SW transformer, 5 is a transformer for a microcomputer auxiliary power supply, 6 is a voltage detection circuit on the secondary side of the SW transformer, 7 Is a constant voltage circuit that can be controlled on / off,
Reference numeral 8 denotes a microcomputer, 9 denotes a signal processing circuit, and 10 denotes a power switch. The operation of the power output control device configured as described above will be described below.

When the power switch is turned on, the microcomputer 8 outputs an ON signal to the relay circuit 2, the SW transformer 4 operates, and the secondary voltage rises. The voltage detected by the voltage detection circuit 6 on the secondary side of the SW transformer is sent to the microcomputer 8 and when a voltage required for the constant voltage circuit 7 is detected, an ON signal is sent to the constant voltage circuit 7 and Supply voltage to the signal processing circuit. After the necessary voltage is supplied to the signal processing circuit, data communication from the microcomputer 8 to the signal processing circuit 9 is started. With the above circuit configuration, the malfunction of the signal processing circuit when the SW is turned on can be more reliably prevented.

(Embodiment 2) In FIG.
Is the same as that in FIG. 1, 11 is a high voltage on / off circuit, and 12 is a deflection output circuit. The operation of the power output control device configured as described above will be described below.

When the power switch is turned on, the microcomputer 8 outputs an ON signal to the relay circuit 2, the SW transformer 4 operates, and the secondary voltage rises. The voltage detected by the voltage detection circuit 6 on the secondary side of the SW transformer is sent to the microcomputer 8 and when a voltage required for the constant voltage circuit 7 is detected, an ON signal is sent to the constant voltage circuit 7 to A voltage is supplied to the deflection control circuit. After the necessary voltage is supplied to the deflection control circuit, data communication from the microcomputer 8 to the deflection control circuit 9 is started, and a deflection control signal is sent to the deflection output circuit 12. Thereafter, an on signal is sent from the microcomputer 8 to the high voltage on / off circuit 11 and the high voltage is supplied to the deflection output circuit 12. With the above circuit configuration, the destruction of the components of the deflection output circuit when the SW is turned on can be more reliably prevented.

[0013]

According to the present invention as described above,
In the television receiver, when the switch is turned on, the voltage of the rising of the power supply on the secondary side of the SW transformer is detected, and the power supply to each circuit and the timing of data communication are controlled to more reliably and accurately operate the circuit. In addition, it is possible to prevent the parts from being destroyed, and it is possible to shorten the time until image output.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC input part 2 Relay circuit 3 Rectifier 4 SW transformer 5 Microcomputer auxiliary power transformer 6 Voltage detection circuit 7 Constant voltage circuit 8 Microcomputer 9 Signal processing circuit, deflection control circuit 10 Power switch 11 High voltage on / off circuit 12 Deflection output circuit 13 First power supply circuit 14 Horizontal deflection output transistor 15 Second power supply circuit 16 Control terminal 17 Protection circuit 18 Comparator 19 Output terminal 20 Resistance 21 Capacitor 22 Diode 23 Resistance

Claims (4)

[Claims] 1. When a switch is turned on, a rising voltage of a power supply on a secondary side of the SW transformer is detected, and when an input voltage required for a constant voltage circuit is reached, power is supplied to each circuit.
A power output control device characterized by preventing malfunction of the circuit by starting data communication from the microcomputer thereafter. 2. A means for detecting a rising voltage of a power supply on a secondary side of a SW transformer when a switch is turned on, a means for detecting that an input voltage required for a constant voltage circuit has been reached, and a power supply for each circuit. A power output control device comprising: means for supplying power; and means for starting data communication. 3. When the switch is turned on, the voltage of the rising of the power supply on the secondary side of the SW transformer is detected, and when the input voltage required for the constant voltage circuit is reached, the power is supplied to the deflection control circuit. A power output control device for supplying high-voltage power to a circuit to prevent destruction of output circuit components. 4. A means for detecting a rising voltage of a power supply on the secondary side of the SW transformer when the SW is turned on, a means for detecting that an input voltage required for a constant voltage circuit has been reached, and a power supply for a deflection control circuit. Power supply control device, comprising: means for supplying a high-voltage power to the deflection output circuit.