JPH046969A - Power supply device - Google Patents

Abstract

PURPOSE:To save power of the device by applying a DC voltage from a drive voltage source to a power switch control circuit only in the standby state and not supplying power to a microcomputer being a control means of the entire device. CONSTITUTION:An output terminal of a remote controller 1 connects directly to a power switch control circuit 10 only and a standby power supply is supplied only to the power switch control circuit 10. Then a microcomputer 2 connects to a power supply terminal of a power switch circuit 4, that is, a same power supply terminal for other TV circuit 7. Through the constitution above, the microcomputer 2 applying arithmetic control of the device is processed as a general power supply secondary load and after the device is started once, the power supplied to a load circuit including the microcomputer is fed to the power switch control circuit controlled based on a remote control signal. Thus, the power consumption in the standby state after the device is once started is very small.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to video equipment such as a portable small television receiver, or audio equipment, in which the power of the equipment is turned on and off by a remote control signal from a remote control transmitter. This invention relates to a power supply device that can be controlled.

BACKGROUND OF THE INVENTION In recent years, electric devices such as portable television receivers have been required to have higher functionality, lower power consumption, and lower voltage. As functions become more sophisticated, for example, in general television receivers, a power switch is configured to be able to be controlled on and off by a control signal from a remote control transmitter.

A conventional power supply device for a television receiver will be described below.

FIG. 7 is a block diagram of a conventional power supply device.

In FIG. 7, 1 is a wired remote control transmission unit (hereinafter referred to as the remote control unit); 2 is a microcomputer (hereinafter referred to as microcomputer) that receives a control signal from the remote control unit 1 and discriminates the control signal; Reference numeral 3 denotes a power switch control circuit, which controls on/off a power switch circuit 4, which will be described later, and which is made up of, for example, a transistor circuit, in accordance with the discrimination output of the microcomputer 2. 5 is the power input terminal of the television receiver, and generally AC is used for each signal processing (video, audio, output 9) of the television receiver.
This is an output terminal that supplies power to the channel selection 2, etc.) circuit. Here, one representative output is shown. In FIG. 7, two circuits, the microcomputer 2 and the power switch control circuit 3, are constantly supplied with DC voltages required for driving, respectively. This power supply is called a standby power supply.

The operation of the power supply device configured as described above will be described below. Power on/off button provided on remote control unit 1
When an off button (not shown) is pressed, an on/off control signal corresponding to the operation button is input to the microcomputer 2.

According to the input on/off control signal, the microcomputer 2 sends rL to the power switch control circuit 3 in a toggle operation.
One of two voltage signals, OW or 'HighJ, is output. These two types of “LOW, J,” H
The power switch control circuit 3 operates according to the voltage of i gh J, turns the power switch circuit 4 on or off,
It controls whether the power supplied from the input terminal 5 is output to the output terminal 6 or not.

Problems to be Solved by the Invention However, in the conventional configuration described above, power must always be supplied to at least the microcomputer 2 for controlling the power switch circuit 4 and the power switch control circuit. For example, portable electrical devices such as small portable television receivers use secondary power sources such as batteries, so the high power consumption in standby mode means that the battery life will be shortened. However, it has various disadvantages such as the cost of battery usage and the hassle of battery replacement.

The present invention solves the above-mentioned conventional problems, and aims to provide a power supply device that can turn on/off the power supply by remote control and consumes less power in standby mode. .

Means for Solving the Problems To achieve this object, the power supply device of the present invention controls a power switch circuit for switching the DC voltage supply in a standby state, so that the DC voltage from the drive voltage source is controlled. The power is supplied only to the power switch control circuit, and the microcomputer serving as the arithmetic control means of the device is connected to the secondary side of the power switch circuit as one of the load circuits.

Effect With the above configuration, in the standby state, only the power switch control circuit that controls on/off of the power switch circuit based on the remote control signal is energized, and no power is supplied to the microcomputer that is the control means for the entire device. . As a result, power saving of the device can be realized.

Embodiment Hereinafter, a power supply device for a television receiver according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows
FIG. 1 is a block diagram of a power supply device of the present invention. As is clear from a comparison between FIG. 1 and FIG. 7, the difference between the power supply device of the present invention and the conventional power supply device is that the output terminal of the remote control 1 is directly input only to the power switch control circuit 10, and Standby power is supplied only to the power switch control circuit 10. The microcomputer 2 is connected to the power supply terminal 6 of the power switch circuit 4, that is, to the same power supply terminal as the other television circuit 7.

FIG. 2 is a specific circuit diagram based on the block diagram shown in FIG. 1.

In FIG. 2, reference numeral 1 denotes a remote control unit, and here only a power button (switch) S+ is shown as a representative. One end of the power switch S1 in the remote controller 1 is grounded to GND, and the other end is connected to a common connection point between the resistor R6 and the resistor R7 of the power switch control circuit 3. The other end of the resistor R6 is connected to the base of the transistor Q3, the emitter of this transistor Q3 is grounded to GND, and the collector is connected to the other end of the resistor R5, one end of which is connected to the power supply VCC input terminal 5, and the D-flip-flop. (D-F-F) circuit 1
It is connected to the C terminal (clock input terminal) of 0. These D-F and -F are C-MOS type M/S type D-F.
-F. The other end of the resistor R7 is connected to the power input terminal 5. The emitter of the transistor Q1 constituting the power switch circuit 4 is connected to the power input terminal 5, the collector is connected to the power output terminal 6, and the base is connected to the resistor RIO.
connected to one end of the The other end of this resistor RIO is connected to the power input terminal 5 via a resistor R9. The collector of a transistor Q2 constituting the power switch control row 3 is connected to the other end of the resistor 1o connected to the base of the transistor Q1. By controlling the base bias of this transistor Q2, the transistor Q2 is controlled on and off, and thereby the transistor Q1 is controlled on and off. The emitter of transistor Q2 is grounded to GND, and the base is connected to D-F through resistor R8.
-F Connected to the Q terminal of 10. D-F-FIO
The Q terminal and D terminal of are connected to the power input terminal 5 via a resistor R2 and a capacitor C2. D-F Flo
The R terminal is grounded to GND, and the S terminal is connected to one end of a resistor R+ and a capacitor C, respectively. Resistance R
, the other end of the capacitor C1 is grounded to GND, and the other end of the capacitor C1 is connected to the power input terminal 5. Q of D-F-Fil
The terminal is connected to the base of a transistor Q4 via a resistor R4, the emitter of this transistor Q4 is connected to GND, and the collector is connected to a common connection point between resistors R6 and R7. The C terminal of DF-FIL is connected to one end of a resistor R3 and a capacitor C3, and to the collector of a transistor Q5. The other end of resistor R3 is connected to power input terminal 5, while the other end of capacitor C3 is connected to GND.
The emitter of the transistor Q5 is grounded to GND, and the base is connected to the input terminal 9 for a signal from the microcomputer 2. In addition, D of D-F-FIL
Both the terminal and the R terminal are grounded to GND.

The operation of the power supply device configured as described above will be explained below.

First, a preset method until the standby state is entered will be explained.

When a power supply voltage VCC as shown in FIG. 3(a) is applied to the power supply input terminal 5 at time T, the transistor Q3 is turned on and its collector is set to rLOWJ, and D
The S terminal of -F-FIO is connected to the S terminal of FIG. 3 (C
) is supplied. When the set pulse voltage is input to the S terminal in this way, the DF-FIO changes from the reset state to the set state. Therefore, D-F-FIO
The level of the Q terminal of is rLOWJ as shown in Figure 3 ω).
On the other hand, the level of the φ terminal changes from time T to "HighJ" for time t2, and then becomes rLOW'J, resulting in the state shown in FIG. 3(e). D-F-F
As shown in FIG. 3(g), the S terminal of
At step 4, the reset state is changed to the set state.

At this time, all the circuits are temporarily turned on through the transistor Q+ because the initial settings have not been made yet. Now, the time t4 is determined according to a control signal from the microcomputer 2 that is input to the base of the transistor Q5 (input terminal 9). In other words, for example, the board that outputs the control signal to turn off the system, such as "rOFFTimer" in microcomputer 2, changes from rLOW to 'High' after time t3 shown in Figure 3). Must be longer than t3 (t4>t3
).

This is because when a voltage is applied to the power input terminal 5 and the D-F-Fil is set to the set state before the microcomputer 2 becomes operational, a voltage of "Hlgh" is applied to the Q terminal of the D-F-Fil. The signal is output, the transistor Q4 turns "ON", the transistor Q3 switches, and a trigger is input to the C terminal of the D-F-F 10. Therefore, D-F-F
This is because the 10 Q terminals cannot implement initial settings.

When a 'High' signal is input to the base of transistor Q2, transistor Q2 is biased to N Vcc).

Now, for the initial setup like this, connect the power supply voltage to the terminal 9)
Then, instead of the signal having the waveform shown in FIG. 3(f), the control signal shown in FIG. 4(a) is input from the microcomputer 2 at a predetermined time interval from time T.

As a result, transistor Q5 is turned off and D-F-
The pulse signal shown in FIG. 4(b) is supplied to the C terminal of Fil, and the signal output from the Q terminal is supplied to the transistor Q.
4 as shown in FIG. 4(C), the transistor Q4 performs a switching operation, and a pulse signal having the waveform shown in FIG. 4(d) is input to the base of the transistor Q4. As a result, the pulse signal shown in Fig. 4(e) is applied to the C terminal of D-F.Flo, and the output level of the Q terminal of D-F-FIO changes due to the time delay tlO at D-F,.F. After, 4th
As shown in Figure 4(g), the voltage changes from rHigh to LOW. Therefore, transistor Q2 turns 0FFJL, transistor Q1 also turns OFF, and the voltage is applied to output terminal 6 as shown in Figure 4(g). The output is no longer output, and the power switching 4 enters the rOFFJ state. At this time, the Φ terminal of D-F-FIO goes to the "High" level as shown in Figure 4, and the Q terminal of D-F-Fil goes to the "High" level. "It becomes LOWJ and is set to the reset state.

As described above, although voltage is supplied to the power switch control circuit 10, the power switch circuit 4 is set to the off state, power is not supplied to the microcomputer 2 and the television circuit 7, and the transistor Q3 is turned off. It becomes a standby state where the mode can be changed by switching the base.

Next, a case will be described in which the power switch circuit 4 is turned on by operating the remote controller from the standby state. When the switch S1 is pressed as shown in FIG. 5(a), the D-F
The pulse signal shown in Fig. 5(b) is input to the C terminal of -FIO, and the pulse signal shown in Fig. 5(b) is input from the Q terminal of D-F -F10.
The "rHIGH" signal shown in c) is output. the result,
The transistor Q1 constituting the power switch circuit 4 is
"ON" and the microcomputer 2. The television circuit 7 is energized. At this time, the LOWJ signal is output from the Q terminal of DF-FIO as shown in Fig. 5(d), and the
As shown in e), the level of the S terminal of D-F-Fil drops from 'HI G-HJ to rI, QW, and D-F
-Fll is changed from the reset state to the set state. In this way, the operation changes from the standby state to the on state.

Next, the case of changing from the on state to the standby state by operating the remote controller will be described.

When the switch S1 is pressed as shown in FIG. 6(a),
The pulse signal shown in FIG. 6(b) is input to the C terminal of D-F-F 10, and the transistor Q3 is switched to change the Q of D-F-F 10 as shown in FIG. 6(C).
The output signal of the terminal changes from the HIGHJ level to the rLOWJ level, and the operation principle is the same as in the previous case.
As shown in Figure (d), the output terminal 6 is in a disconnected state.

As described above, according to the present embodiment, it is possible to configure a power supply device with low power consumption, which consumes no power other than the minute power consumption by the power switch control circuit after the first startup. In this embodiment, the remote control method is a wired method, but a wireless method can be similarly implemented based on well-known technology.

In this case, it is necessary to keep the remote control receiver in the on state even in the standby state, like the power switch control circuit.

Effects of the Invention As described above, according to the present invention, the microcomputer that realizes the arithmetic control of the device is treated in the same way as a general power supply secondary side load circuit, and once started, the load circuit including the microcomputer is Because the power supply is configured to only energize the power switch control circuit that controls the power supply based on remote control signals, the power consumption in the standby state after startup is very low compared to conventional power supplies. The device can be realized.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of a main part of a power supply device according to an embodiment of the present invention, and FIGS. Figure 5 is a waveform diagram for explaining the initial setting operation of the power supply device; Figure 5 is a waveform diagram for explaining the power-on operation;
The figure is a waveform diagram for explaining power-off operation, and FIG. 7 is a block diagram of a conventional power supply device. 1... Remote control circuit, 2... Microcomputer, 4... Power switch circuit, 5... Power supply voltage input terminal, 6... Power supply Voltage output terminal, 7
...TV circuit, 10...Power switch control circuit. Name of agent Patent attorney Shigetaka Awano and one other person Figure 1 w 4-stage setting (-Waveform diagram for waveform diagram for waveform diagram for waveform diagram for waveform diagram J-1) - low switch 6 Figure

Claims (1)

[Claims] Direct current voltage from the drive voltage source is constantly supplied in standby mode, and the power can be turned on or off from the remote control transmitter.
A power switch control circuit that outputs a signal to control whether or not to supply DC voltage from the drive voltage source to the load based on a pulse signal for off control; Based on the control signal from the power switch control circuit, a driving DC voltage is selectively applied to the microcomputer, which is the arithmetic control means for the entire device, and to the load circuit, which is driven by the DC voltage from the driving voltage source. A power supply device comprising: a power switch circuit that supplies voltage, and configured such that power consumption occurs only in the power switch control circuit in a standby state.