JP2000014005A - Power supply device of electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a power consumption in a waiting state. SOLUTION: A relay 16 and a control unit 40 are made to operate by an induced voltage which is induced in the secondary winding N2a of a transformer 12 by applying an input voltage to the primary windings N1a and N1b or only the primary winding N1a of the transformer 12. While an electronic apparatus is in a waiting state, the application of the input voltage to the primary winding N1b is discontinued by the relay 16 and the control unit 40. While the electronic apparatus is in an operation state, the relay 16 is driven by the control unit 40 to apply the input voltage to the primary winding N1b and the electronic apparatus is made to operate by the induced voltage which is induced by applying the input voltage to the primary winding N1b. As the input voltage is not applied to the primary winding N1b in the waiting state, a power consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for electronic equipment. More specifically, the application of the input voltage to the second primary winding is stopped and the operation of the electronic device is stopped during standby of the electronic device using a transformer having first and second primary windings and a secondary winding. Sometimes, by applying an input voltage to the first and second primary windings and applying an input voltage to the first and second primary windings, the induced voltage induced in the secondary winding is used. By operating the electronic device, power consumption during standby of the electronic device is reduced.

[0002]

2. Description of the Related Art In recent years, various countermeasures against environmental problems have been taken. For example, in electronic equipment, power consumption during operation has been reduced in order to reduce power consumption most effectively. ing. Since the power generation amount can be reduced by reducing the power consumption in this manner, the amount of carbon dioxide generated due to the power generation can be reduced.

[0003]

In an electronic device, power is consumed not only during operation but also during standby. For example, a predetermined signal is supplied from a remote control signal transmitter (hereinafter, referred to as "remote control transmitter") by supplying power to a remote control signal receiving circuit (hereinafter, referred to as "remote control receiver circuit") or a timer circuit. Is detected by the remote control receiving circuit or when the timer circuit detects that a predetermined time has elapsed, the operation of the electronic device is started immediately. Therefore, in order to further reduce the power consumption of the electronic device, it is necessary to reduce not only the power consumption during operation but also the power consumption during standby.

In view of the above, an object of the present invention is to provide a power supply device for an electronic device capable of reducing power consumption during standby.

[0005]

A power supply device for an electronic device according to the present invention includes a transformer having a first primary winding, a second primary winding and a secondary winding, and a second primary winding of the transformer. Voltage application control means for controlling the application of the input voltage to the line, and by applying the input voltage to only the first and second primary windings or only the first primary winding, the secondary The operation of the voltage application control means is performed by using the induced voltage induced in the winding, and the voltage application control means stops application of the input voltage to the second primary winding when the electronic device is on standby. In operation of the electronic device, an input voltage is applied to the second primary winding, and the electronic device is operated using the induced voltage induced in the secondary winding of the transformer.

In the present invention, the voltage application control means for controlling the application of the input voltage to the second primary winding of the transformer comprises a first and a second primary winding of the transformer or the first primary winding.
When the input voltage is applied only to the primary winding of the transformer, the transformer is operated using an induced voltage induced in, for example, the first secondary winding. Here, when the electronic device is on standby, the input voltage is applied to the first primary winding to operate the voltage application control means, and the application of the input voltage to the second primary winding is performed by the voltage application control means. Is stopped. Next, when the voltage application control means detects that an operation switch, a remote control device, or the like has been operated to start the operation of the electronic device, the input voltage is applied to the second primary winding. Then, the operation of the electronic device is performed using the induced voltage induced in the second secondary winding of the transformer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a power supply device 10 of an electronic device, and a transformer 12 includes two power supplies.
One primary winding N1a, N1b and two secondary windings N2a, N2
2b.

[0008] One terminal T1 of the primary winding N1a of the transformer 12 is connected to one terminal of the AC plug 14, and the other terminal T2 of the primary winding N1a is connected to the other terminal of the AC plug 14. . Commercial power is supplied to the AC plug 14. One terminal T3 of the primary winding N1b is connected to one terminal of the AC plug 14. The other terminal T4 of the primary winding N1b is connected to one terminal R1 of the contact portion of the relay 16, and the other terminal R2 of the contact portion of the relay 16 is connected to the other terminal of the AC plug 14. .

The terminals T5 and T6 of the secondary winding N2a are connected to the AC input terminals 20a and 20b of the bridge rectifier circuit 20, and the terminals T7 and T8 of the secondary winding N2b are connected to the AC input terminals of the bridge rectifier circuit 22. 22a and 22b.

The positive output terminal 2 of the bridge rectifier circuit 20
0c is connected to the input terminal side of the constant voltage circuit 30, and the negative side output terminal 20d is grounded. The positive output terminal 22c of the bridge rectifier circuit 22 is connected to the emitter of the transistor 45, and the negative output terminal 22d is grounded. A smoothing capacitor 25 is connected between the positive output terminal 20c and the negative output terminal 20d of the bridge rectifier circuit 20, and the positive output terminal 22c and the negative output terminal 2c of the bridge rectifier circuit 22 are connected.
A smoothing capacitor 27 is connected between the capacitor 2d.

The output terminal side of the constant voltage circuit 30 is connected to a control unit 40 constituting voltage supply control means and one terminal L1 of the coil of the relay 16. The other terminal L2 of the coil
Is connected to the collector of the transistor 50 constituting the voltage supply control means. The emitter of the transistor 50 is grounded, and the base is connected to the control unit 40.

The collector of the transistor 45 is connected to the operation circuit of the electronic device, and the base is connected to the collector of the transistor 48. The emitter of the transistor 48 is grounded, and the base is connected to the control unit 40.

An operation switch 41 for switching the operation of the electronic equipment and a remote control receiving circuit 42 for receiving a signal from a remote control transmitter are connected to the control unit 40, and a display unit 43 for displaying time and the like. Is connected.

When the electronic device is in a standby state, the transistor 50 is turned off based on a control signal CTP from the control unit 40, and the contact of the relay 16 is opened. For this reason, the input voltage (commercial power) supplied from the AC plug 14 is applied to the primary winding N1a, and a voltage is induced in the secondary winding N2a. This induced voltage is converted into a DC voltage by the bridge rectifier circuit 20.
The DC voltage Vd1 is converted to a predetermined voltage V by the constant voltage circuit 30.
The operation of the control unit 40 is performed using the predetermined voltage Vs. The predetermined voltage Vs is also supplied to the relay 16.

Next, when the operation switch 41 is operated or the operation of the electronic device in the standby state is started based on a reception signal from the remote control reception circuit 42,
Alternatively, when the operation of the electronic device is started after a predetermined time has elapsed by the timer circuit, the transistor 50 is turned on by the control signal CTP. At this time, a current flows through the coil of the relay 16, and the terminals R1 and R2 are made conductive. Therefore, the input voltage is also applied to the primary winding N1b, and a higher voltage is induced on the secondary winding N2b side than in the standby state. This induced voltage is converted to a DC voltage Vd2 by the bridge rectifier circuit 22 and supplied to the emitter of the transistor 45.

A control signal CTQ is supplied from the control unit 40 to the base of the transistor 48, and the transistor 48 is turned on. Here, when the transistor 48 is turned on, the transistor 45 is also turned on. Therefore, the DC voltage Vd2 is supplied to each operation circuit of the electronic device via the transistor 45, and the operation of the electronic device is performed. .

As described above, according to the above-described embodiment, the input voltage is applied to one of the two primary windings N1a of the transformer 12 at the time of standby, so that the control unit 4
Operations such as 0 and the relay 16 are performed. For this reason, for example, assuming that the primary winding uses one transformer, an input voltage is applied to the primary winding, a voltage for performing a desired operation in the electronic device is induced in the secondary winding, and the control unit is operated. Power consumption during standby, compared to a power supply that stops the supply of the voltage induced to the secondary winding to each operating circuit of the electronic device during standby. Can be.

In addition, since it is possible to prevent the power supply device from being driven in a state where the load is reduced during standby and the conversion efficiency is low, for example, a transformer () for supplying electric power necessary for performing a desired operation in an electronic device is provided. By separately providing a transformer (auxiliary transformer) for supplying power to the main transformer) and the control unit, by stopping application of the input voltage to the main transformer during standby, power consumption during standby is reduced. For the power supply device, two primary windings of a transformer are provided, and during standby, application of the input voltage to one primary winding only needs to be stopped. A power supply device with low power can be provided. Further, it is possible to prevent the power supply device from becoming large and the weight from being greatly increased.

In the above embodiment, a transformer having two primary windings and two secondary windings is used. However, the number of windings is not limited to the above embodiment. . For example, when the difference between the voltage level of the induced voltage required to perform a desired operation in the electronic device and the voltage level of the induced voltage required to operate the control unit is not large, the secondary winding The number is set to one, a desired induced voltage is obtained during operation from the secondary winding, a desired operation is performed, and a voltage for operating the control unit is generated from the induced voltage. It is also possible to obtain an induced voltage of a lower voltage level than during operation, and operate the control unit with this induced voltage. In this case, since the difference between the voltage level of the induced voltage required to perform a desired operation in the electronic device and the voltage level of the induced voltage required to operate the control unit is not large, the constant voltage The loss in the circuit does not increase during operation. Further, the electronic device can be operated as a device having a plurality of secondary windings and obtaining a plurality of voltages having different voltage levels.

Further, the control of the supply of the input voltage to the primary winding N1b is not limited to the case where the control is performed using a relay, but may be, for example, performed using a semiconductor element or the like. .

[0021]

According to the present invention, the input voltage is applied to only the first and second primary windings of the transformer or only the first primary winding, and the induced voltage induced in the secondary winding of the transformer is obtained. Is used to operate the voltage application control means. The voltage application control means stops the application of the input voltage to the second primary winding when the electronic device is on standby. In operation of the electronic device, an input voltage is applied to the second primary winding, and the electronic device is operated using the induced voltage induced in the secondary winding. As described above, since the application of the input voltage to the second primary winding is stopped during standby, power consumption during standby can be easily reduced with an inexpensive configuration.

The transformer has first and second secondary windings, and the operation of the voltage application control means is performed using the induced voltage induced in the first secondary winding. The operation of the electronic device is performed using the induced voltage induced in the second secondary winding of the transformer. Therefore, even when the voltage difference between the voltage for operating the electronic device and the voltage for operating the voltage application control means is large, the electronic device and the voltage application control means can be easily operated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a power supply device of an electronic apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Transformer 14 AC plug 16 Relay 20 and 22 Bridge rectifier circuit 30 Constant voltage circuit 40 Control part 41 Operation switch 42 Remote control signal receiving circuit 43 Display part

Claims (2)

[Claims] 1. A transformer having a first primary winding, a second primary winding, and a secondary winding, and a voltage application control for controlling application of an input voltage to a second primary winding of the transformer. Means for applying an input voltage to only the first and second primary windings or only the first primary winding, thereby using an induced voltage induced in a secondary winding of the transformer. The operation of the voltage application control unit is performed, and the application of the input voltage to the second primary winding is stopped during standby of the electronic device, and the operation of the electronic device is stopped. A power supply device for an electronic device, wherein an input voltage is applied to the second primary winding, and the electronic device is operated using an induced voltage induced in a secondary winding of the transformer. 2. The transformer has first and second secondary windings, and performs an operation of the voltage application control means using an induced voltage induced in the first secondary winding of the transformer. The power supply device for an electronic device according to claim 1, wherein the electronic device is operated using an induced voltage induced in a second secondary winding of the transformer.