JP2000156968A - Electrical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate wasteful consumption power in a standby state, and prevent malfunction of a device, in the device equipped with a first power source for supplying power for control and a second power source for supplying power for operation. SOLUTION: In this electrical device, a first switching regulator device 1 for supplying power for control and a second switching regulator device 2 for supplying power for operation are installed. Between the first device 1 and a control part, a switching element SW1 is interposed. When operation of the device is started, the switching element SW1 is turned on, and first, necessary power is supplied to the control part. Secondly, the power for operation is supplied from the second device 2. When the state is transited to a state of non-operation, the switching element SW1 is turned off. As a result, the power supply to the control part is stopped, and the supply of operation power from the second device 2 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device which is particularly suitable for a device using a switching regulator and saves energy.

[0002]

2. Description of the Related Art Devices using a switching regulator are being devised so as to consume as little power as possible in a state where the function of the device is not used, that is, in a so-called standby state. Some are specified in. The following three points must be considered in promoting this energy saving.

Low power (mainly several tens of watts or less than several watts)
Higher efficiency of the device below Lower cost How to cut off the unused output system Figure 3 is a block diagram showing the main parts of the device that saves energy by taking into account the above points and taking particular points into account. is there. In the figure, reference numeral 1 denotes a first switching regulator device, which supplies a control output Vo1 to a device main body (not shown), and also supplies an output Vo2 via a switch element SW1. Reference numeral 2 denotes a second switching regulator device for supplying an operation output Vo3.

The switch element SW1 is turned on / off (O) from the second switching regulator device 2.
FF) is controlled by a trigger signal, and when the device is in operation, the device becomes conductive and the first switching regulator device 1 supplies power required for control. Then, when the normal operation state is shifted to the standby state, for example, when the function of the apparatus continues to be not used even after a certain period of time, the switch element SW1 is turned off. As a result, the supply of the control output Vo2 from the first switching regulator device 1 together with the operation output Vo3 from the second switching regulator device 2 is stopped, and only the minimum output Vo1 necessary in the standby state is output. It will be in the supplied state.

FIG. 4 shows how the output rises in the above device. FIG. 3A shows a trigger (TRG) from the second switching regulator device 2.
In the case where the control output Vo2 rises a little later than the signal, (b) in the same figure shows the case where the output Vo2 rises simultaneously with the trigger signal.

[0006]

By the way, in the apparatus having the above-mentioned structure, no wasteful power consumption occurs during standby, but the switching element becomes conductive after the output of the trigger signal. It takes time, and there is a problem that a malfunction may occur if the control output Vo2 first rises before transitioning from the standby state to the normal operation state and then the operation output Vo3 does not rise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a simple and inexpensive configuration to promote energy saving and obtain a safe electric device without malfunction. It is an object.

[0008]

The electric device according to the present invention is configured as follows.

(1) A first power supply for outputting control power necessary only for predetermined control, a second power supply for outputting operation power necessary for operation, and a power supply between the first power supply and a control unit. A switching element interposed therebetween, to supply the required power to the control unit by conducting the switching element during operation, and to supply operating power from a second power supply, and to operate when not operating. The power supply to the control unit is stopped by turning off the switch element, and the supply of operating power from the second power supply is stopped.

(2) In the above configuration (1), the operation of the second power supply is controlled by the output of the switch element.

(3) In the above configuration (1) or (2), the first power supply and the second power supply are switching regulators.

(4) In any of the above constitutions (1) to (3), the control power required only for the predetermined control is the minimum power required during standby.

[0013]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. As in the device of FIG. 3, the device of the present embodiment includes a first switching regulator device (first power supply) 1 forming a control system and a second switching regulator device (second power source) forming a functional operation system. Power supply) 2
And The switching device SW1 includes a switching element SW1 interposed between the first switching regulator device 1 and a control unit (not shown).
ON / OFF of the second switching regulator device 2 is controlled by the output of.

The first and second switching regulator devices 1 and 2 may have either an AC input or a DC input. The switch element SW1 is a relay, a MOSF
It is a general one composed of ET, thyristor, transistor, triac and the like.

Further, DC voltage outputs Vo1, Vo2, and Vo3 are supplied from the first and second switching regulator devices 1 and 2 to a device body (not shown). The output Vo1 is control power required only for predetermined control, that is, the minimum power required during standby, and is constantly output to the control unit. The output Vo2 is power required for the control unit in the operation state of the apparatus, and is not output during standby when the function of the apparatus is not used. The output Vo3 is the operating power required for the functional operation (operation) of the device.
Is stopped and is not output.

In this embodiment, for the purpose of saving energy and at the same time preventing malfunction of the apparatus, sequence control of outputs that are always required and outputs that are not is performed. After the output Vo2 rises, the output signal Vo3 is controlled by the output signal to rise next.

That is, when the device enters a use state, the switch element SW1 is turned on by a trigger signal from the device, and a part of the output of the first switching regulator device 1 is output to the control unit as the output Vo2 through the switch element SW1. At the same time, the output Vo3 of the second switching regulator device 2 is supplied to the functional unit. When the apparatus enters a standby state, the switch element SW1 is turned off so that the output Vo2 stops and the output V
o3 also stops.

FIG. 2 shows how the output rises in this embodiment. The output Vo1 is constantly supplied, and when the operation starts, the switch element SW1 is supplied by a trigger signal.
Is turned on, the output Vo2 is supplied first, and then the output Vo3 is supplied. Further, when the apparatus enters the standby state from the normal operation state, for example, when the apparatus is not used even after reaching the predetermined time, the switch element SW1 becomes non-conductive, and the supply of the unnecessary outputs Vo2 and Vo3 is stopped as described above. You.

As described above, in this embodiment, the switching element S
With a simple and inexpensive configuration using W1, energy saving can be promoted and malfunction of the device can be prevented.

[0020]

As described above, according to the present invention, with a simple and inexpensive configuration, unnecessary power consumption is eliminated, energy saving is promoted, and the operation power is supplied after the control power is supplied. Since power is supplied, malfunctions are reliably prevented, and there is an effect that reliability is improved.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing a rising edge of an output according to the embodiment.

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

FIG. 4 is an explanatory diagram showing a rise of an output in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st switching regulator apparatus 2 2nd switching regulator apparatus SW1 switch element

Claims (4)

[Claims] 1. A first power supply for outputting control power necessary only for predetermined control, a second power supply for outputting operation power necessary for operation, and a first power supply and a control unit between the first power supply and a control unit. An intervening switch element, which supplies the necessary power to the control unit by conducting the switch element during operation;
And supplying the operating power from the power supply, and stopping the power supply to the control unit by turning off the switch element when not operating, and stopping the supply of the operating power from the second power supply. Electrical equipment. 2. The electric device according to claim 1, wherein an operation of the second power supply is controlled by an output of the switch element. 3. The electric device according to claim 1, wherein the first power supply and the second power supply are switching regulators. 4. The electric device according to claim 1, wherein the control power required only for the predetermined control is a minimum power required during standby.