JPS6111508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device suitable for application to a device having two load devices, such as a television receiver and a VTR (video tape recorder).

For example, one could consider a device that integrates a television receiver and a VTR (video tape recorder) into a common cabinet to improve usability and design.

In a device that integrates a television receiver and a VTR in this way, the VTR's recording state and
Depending on the state of the control mechanism for setting the playback state or fast-forward state, it may not be necessary to put it into operation together with the television receiver. Also, when a control mechanism other than these, such as a timer, is provided,
Since it is necessary to control the television receiver and the VTR separately, separate power switches are usually provided for the television receiver and the VTR.

However, when each device is provided with its own dedicated power switch, the operation becomes complicated for the user of the device, and the user has to turn on the power only to the television receiver and record while watching the screen. In such cases, inconveniences such as forgetting to turn on the VCR may occur. Therefore, in order to avoid such a situation, it is desirable to have only one common power switch.

In view of the above-mentioned points, the present invention provides a power supply in which, even if the power switch is one common to two load devices, the same effect as providing a separate power switch for each load device can be obtained. The aim is to provide equipment.

An example of a power supply device according to the present invention will be described below.
Let us explain with reference to the drawings, taking as an example the case where the invention is applied to a device in which a vision receiver and a VTR are integrated.

In FIG. 1, 1 is a power switch, and in this example, a non-lock type switch is used.

2 is the television receiver section, 3 is the VTR section,
4 and 5 are these television receiver sections 2 and 5.
Relays 6 and 7 that control the on/off of power to the VTR section 3 are transistors that control the current flowing through these relays 4 and 5 in a switching manner.

Reference numeral 8 denotes a switch that is linked to a control mechanism of the VTR unit 3, such as a recording switch, a playback switch, and a fast forward or rewind switch.

9 is a timer. Reference numerals 10 and 11 are mutually interlocking switches connected to the contact N side normally, and to the contact S side when the timer 9 is set.

12 and 13 are flip-flop circuits, and one output signal of the flip-flop circuit 13 is
S ₂ (FIG. 2D) is supplied to the base of transistor 6 through resistor 14 and diode 15, and this signal S ₂ is supplied to switch 10 through resistor 16.
is supplied to contact N of Further, the connection point between the resistor 14 and the diode 15 is connected via the diode 17 to the other output signal ₁ (second output signal) of the flip-flop circuit 12.
Connected to the resulting terminal in Figure C).

Further, 18 is a power plug, and when this plug is inserted into a power outlet, a rectifier circuit 19 rectifies, for example, a commercial AC voltage, so that a predetermined DC voltage +B (FIG. 2A) is obtained at its output terminal.

The output end of this rectifier circuit 19 is connected to a resistor 20.
A resistor 22 is connected between the base of the transistor 21 and the output terminal of the rectifier circuit 19.
and 23 are connected in series, and a connection point P between these resistors 22 and 23 is grounded via switch 8 and connected to contact S of switch 11.

Further, 24 and 25 are gate circuits, respectively.
First and second gate signals are supplied to the gate circuits 24 and 25, respectively, and the gate circuits 24 and 25 are turned off only when both gate signals become "0". and,
In this case, the gate circuit 24 is supplied with one output signal S 1 (FIG. 2B) of the flip-flop circuit 12 as the first gate signal, and the output signal S ₁ (FIG. 2B) of the flip-flop circuit 12 is supplied as the second gate signal. A signal voltage E ₁ (FIG. 2G) is supplied.
The gate circuit 25 is supplied with one output signal ₂ (E in FIG. 2) of the flip-flop circuit 13 as a first gate signal, and the voltage E ₀ (E in FIG. 2) at the connection point P as a second gate signal. 2 H) is supplied.

26 is a monostable multivibrator, which is triggered when power switch 1 is turned on.
A pulse S _P (FIG. 2F) is obtained at its output, which is supplied as a trigger pulse to flip-flop circuits 12 and 13 through gate circuits 24 and 25.

In the circuit configured in this manner, when the plug 18 is inserted into the power outlet at time _t0 , the output voltage +B (FIG. 2A) of the rectifier circuit 19 rises.

Then, this voltage +B is supplied to the flip-flop circuits 12 and 13, and the clear terminals of these flip-flop circuits 12 and 13 are momentarily regarded as "0" by the resistor 27 and capacitor 28, so that the flip-flop circuits 12 and 13 are When cleared, one output S ₁ (FIG. 2B) of the flip-flop circuit 12 becomes "0", and the other output ₁ (FIG. 2C) becomes "1",
Also, one output S ₂ of the flip-flop circuit 13
(D in the same figure) becomes "0", and the other output ₂ (E in the same figure) becomes "1".

Further, at this time, if the control mechanism of the VTR section 3 is not in an operating state and the timer 9 is not set, the switch 8 is off, and the switch 1 is turned off.
0 and 11 are connected to contact N. Therefore,
The transistor 21 is turned on and the voltage E ₁ (second
Figure G) becomes "0", while the voltage E ₀ (Figure 2 H) becomes "1". Therefore, the gate circuit 24 is off and the gate circuit 25 is on.

In this state, at time t ₁ , power switch 1 is turned on.
When is pressed, a pulse S _P (FIG. 2F) is obtained at the output of the monostable multivibrator 26. At this time, since the gate circuit 25 is on, its output
A pulse is obtained at G ₂ (Fig. 2 J), and this pulse 〓〓〓〓
This triggers the flip-flop circuit 13, and its one output _S2 is inverted from "0" to "1", and the other output _S2 is inverted from "1" to "0". Then, since the output S ₂ is "1", the transistor 7
turns on, current flows through relay 5, and the make contact closes, so power is turned on to VTR unit 3.

Also, at this time, since the other output ₁ of the flip-flop circuit 12 is "1", the diode 17 is off, and therefore the transistor 6 is turned on, current flows through the relay 4, the make contact is closed, and the TV Power is also turned on to the digital receiver unit 2.

In this state, output ₂ is "0", but the voltage
Since E ₀ remains at "1", the gate circuit 24 is still off and the gate circuit 25 is on.

Then, at time _t2 , when the power switch 1 is pressed again, the output pulse S _P of the monostable multivibrator 26 is gated by the gate circuit 25, and a pulse is obtained at the output _G2 of the gate circuit 25, thereby Since the flip-flop circuit 13 is inverted and the output _S2 is inverted to "0",
Transistors 6 and 7 are turned off, the make contacts of relays 4 and 5 are opened, and the power to both television receiver section 2 and VTR section 3 is cut off.

In this way, by simply pressing one power switch 1, the television receiver section 2 and the VTR section 3 can be turned on and off at the same time.

Next, when the power switch 1 is pressed at time _t3 , the television receiver section 2 and the VTR section 3 are simultaneously powered on in the same manner as at time _t1 .

In this state, when, for example, a recording switch of the VTR section 3 is turned on at time _t4 , the switch 8 is turned on and the voltage _E0 becomes "0". On the other hand, since the transistor 21 is turned off, the voltage E ₁ is "1"
becomes. Then, since the voltage E ₀ and the output ₂ are both "0", the gate circuit 25 is turned off, and since the voltage E ₁ is "1", the gate circuit 24 is turned on.

Then, the recording switch is turned on and the VTR
When the unit 3 is in the recording state, when the power switch 1 is pressed at time t ₅ , the output pulse S _P of the monostable multivibrator 26 is gated by the gate circuit 24 and its output G ₁ (Fig. 2 A pulse is obtained at I), which causes the flip-flop circuit 12
is triggered, the other output ₁ becomes "0",
Since the diode 17 is turned on, one output _S2 of the flip-flop circuit 13 is connected to the diode 17.
Since the current flows to the other output terminal of the flip-flop circuit 12 via the transistor 6, the transistor 6 is turned off. Then, the current to the relay 4 is cut off, and the power to the television receiver section 2 is turned off.

Furthermore, when the power switch 1 is pressed at time _t6 , the output pulse S _P of the monostable multivibrator 26 is
is again gated by the gate circuit 24 to obtain a pulse at its output _G1 , which triggers the flip-flop circuit 12, causing the output ₁ to go from ``0'' to ``1'' and diode 17 to turn off. .

Therefore, the output S ₂ of the flip-flop circuit 13
is supplied to the base of transistor 6 through diode 15, turning on transistor 6, current flows through relay 4, and power to television receiver section 2 is turned on.

In this way, while the recording switch of the VTR unit 3 is turned on and the VTR unit 3 is in the recording state, the VTR
The unit 3 is not connected to the power switch 1 and is always powered on, and the television receiver unit 2
Only the power switch 1 turns on and off the power switch 1.

Next, when the recording switch of the VTR section 3 is released at time _t7 , the switch 8 is turned off, and the voltage _E1 becomes "0" and the voltage _E0 becomes "1". Then, the gate circuit 25 is turned on again, and each time the power switch 1 is pressed, a pulse is obtained at the output _G2 of the gate circuit 25, and the flip-flop circuit 13 is inverted. The power to both the receiver unit 2 and the VTR unit 3 is turned on and off (see time _t8 in FIG. 2).

Furthermore, when the power switch ₁ is pressed at time t9 and power is turned on to the television receiver unit 2 and VTR unit 3, and the timer 9 is set to the set time _t12 at time _t10 . , switches 10 and 11 interlocked therewith are connected to the contact S, respectively.

Then, transistor 7 is turned off, and therefore 〓〓〓〓
The power to the VTR section 3 is turned off. At the same time, the transistor 21 is turned off, the voltage E ₁ changes from "0" to "1", and the voltage E ₀ becomes "0".

Then, the gate circuit 24 is turned on, and the gate circuit 25 is turned off. When the power switch 1 is pressed, an output pulse is obtained at the output _G1 of the gate circuit 24, and as a result, the flip-flop circuit 1
2 is inverted, the power to the television receiver section 2 is turned on and off. That is, regardless of the state of the timer 9, the television receiver section 2
can be turned on or off.

In this case, when the timer 9 is to turn on the power to the television receiver section 2 at a set time _t12 so that a predetermined program can be viewed, the timer 9 will turn on the pulse T at the time _t12 . _P (Fig. 2M) is obtained, which clears the flip-flop circuit 12, so that one output _S1 is "0" and the other output _S1 is "1".
Then, at time _t12 , power is turned on to the television receiver section 2.

Also, when the timer 9 turns on the power to the VTR unit 3 at the set time t ₁₂ and causes it to enter the recording state, the timer 9 causes the voltage E ₂ to rise at the time t ₁₂ (N in Figure 2). As a result, the transistor 7 is turned on from time _t12 , and the VTR unit 3 is powered on.

Then, at time _t13 , when the timer 9 is unset, the switches 10 and 11 are connected to the contact N, and the voltage _E1 becomes "0" and the voltage
E ₀ becomes "1".

Therefore, thereafter, the power switch 1 turns on and off the power to the television receiver section 2 and the VTR section 3 at the same time.

In this case, switch 8 is on or switch 11 is connected to contact S, and voltage E ₁
is "1" and the voltage _E0 is "0", it is sufficient that the state of the flip-flop circuit ₁₃ is such that one output S2 is "1", but when this one output _S2 is "0", Even if the state of the flip-flop circuit 12 is reversed, the power to the television receiver unit 2 is not turned on or off, but in this example, the other output ₂ of the flip-flop circuit 13 is supplied to the gate circuit 25 as its gate signal. so one output
When S ₂ is "0", the other output ₂ is "1", so when the power switch 1 is pressed, a pulse is also obtained from the output of the gate circuit 25, and the flip-flop circuit 13 always outputs one of the outputs. _S2 is set to "1" and the other output ₂ is set to "0", so there is no risk of malfunction.

As described above, according to this invention device, 2
It is possible to turn on and off the power supplies for both load devices with a single power switch, and for example, when operating the control mechanism of the VTR section 3 or setting the timer, the operation of the VTR section 3 is controlled. It is possible to turn on and off the power of at least one load device, such as a television receiver unit, regardless of the timer or timer.

That is, a single power switch can be used as a power switch for both of two load devices, and can also be used as a power switch for only one load device, as appropriate, and by simply providing a single power switch, The same effect as providing a power switch for each of the two load devices can be obtained.

The example in the figure is a television receiver and a VTR.
Although the present invention has been described using an example of a device that integrates a radio receiver and a cassette tape recorder, the present invention is not limited to this, and can also be applied to, for example, a device that integrates a radio receiver and a cassette tape recorder. In addition, various types of load devices can be considered.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an example of the device of the present invention, and FIG. 2 is a waveform diagram for explaining the same. 1 is a power switch, 2 is a television receiver section, 3 is a VTR section, 8 is a switch linked to the recording switch of VTR section 3, 9 is a timer, 10 and 1
1 is a switch linked to the set switch of timer 9; 12 and 13 are flip-flop circuits; 2
4 and 25 are gate circuits. 〓〓〓〓

Claims (1)

[Claims] 1 A first and second load device, one power switch common to these, a pulse output circuit that outputs a pulse every time this power switch is pressed, and an output pulse of this pulse output circuit is supplied. 1st
and a second gate circuit, and a circuit to which the gate output pulse of the first gate circuit is supplied to turn on or off one of the first or second load device;
A gate output pulse of the second gate circuit is supplied to turn on both the first and second load devices.
and a control mechanism provided in association with the first or second load device to reverse the opening/closing states of the first and second gate circuits, wherein the control mechanism is not in an operating state. At times, the second gate circuit is opened, and the power to the first and second load devices is simultaneously turned on and off by operating the power switch, and when the control mechanism is in operation, the first A power supply device in which a gate circuit is opened and power to at least one load device is turned on and off by operating the power switch, regardless of the state of the control mechanism.