JPH1195806A - Power source control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the power consumption when electronic equipment is in a stand-by state by making a 2nd relay contact so as to be interlocked with a 1st relay contact and inputting a power-source synchronizing signal to a control circuit when a power-ON switch is not pressed. SOLUTION: A power-ON switch 261 is equipped with a normally open terminal NO which is connected in parallel to the 1st relay contact 25b of a relay controlled and closed when depressed by the control circuit 20, a normally closed terminal NC which is opened when depressed, and a common terminal COM, and on the side of the normally closed terminal NC of the power-ON switch 261, a power-source synchronizing signal detecting circuit 29 is provided through a 2nd relay contact 25c controlled so as to be interlocked with the 1st relay contact 25b. The power-ON synchronizing signal detecting circuit 29 closes the 2nd relay contact 25c so as to be interlocked with the 1st relay contact 25b and also inputs a power-source synchronizing signal to the control circuit 20 when the power-ON switch 261 is not pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device for electric appliances such as a washing machine and various electronic devices, and more particularly to an energy-saving type power supply control device configured to eliminate power consumption during standby.

[0002]

2. Description of the Related Art A conventional power supply control device of this kind, for example,
As a power supply control device for shutting off power to a load circuit such as a washing motor and a control circuit for controlling the load circuit during standby of the washing machine and reducing power consumption to zero as shown in FIGS. It has been filed as Japanese Patent Application No. 8-283839.

In this power supply control device, when a power-on switch (power-on switch) 26 is pressed as shown in FIGS. 4 and 5, power is supplied from the power supply 1 to the control circuit 20, and the control circuit 20 is activated. When the control circuit 20 starts operating, the relay contact 25b is closed and the power-on switch 2
6 returns to the open state, the power supply 1 is connected to the control circuit 20 via the relay contact 25b, so that the relay contact 25 is self-controlled until the control circuit 20 outputs a signal for opening the relay. Hold. Therefore, even if the power-on switch 26 is closed and then opened, the control circuit 2
0 maintains the operation, and the load of the electric equipment (washing motor 3,
The phase advance condenser 4, the drain valve 5, and the water supply valve 6) can be continuously operated.

When a series of process programs is completed, the relay contact 25b is opened and the power supply to the control circuit 20 is cut off, so that power consumption during standby can be reduced to zero.

When a signal for stopping the operation of the load and putting it in a standby state is input to the control circuit 20 from the power-on switch 26 of the input means even while the load is operating, the control circuit 20
First stops the operation of all the load circuits, then opens the relay contact 25b, cuts off the power from the power supply 1 to the control circuit 20, and disconnects the load from the power supply 1 to put it in a standby state. Even when stopped in the middle, power consumption in the standby state can be eliminated.

[0006]

However, according to the above-mentioned conventional power supply control device, in order to interrupt the process program input or during the operation of the process program and enter the standby state, the power supply is provided in the input means. An off switch is required, and a conventional method has been established in which a single switch (power on / off switch) is used to alternately switch between power on (process program input, course operation enabled) and power off (standby). Therefore, using separate switches for power-on and power-off degrades operability.

Further, since the load circuit and the control circuit are connected to the power-on switch, if the switching element (semiconductor switching element such as a triac) for controlling the load is short-circuited, the load is not turned on when the power is turned on. It was dangerous because a large current would flow through the power-on switch, burning the switch.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a safe power supply control device with good operability while eliminating power consumption during standby of electric or electronic equipment such as a washing machine. .

[0009]

According to a first aspect of the present invention, there is provided a power supply control apparatus for achieving the above object.
A control circuit for controlling the load circuit, a first relay contact of a relay controlled by the control circuit, a normally open circuit terminal that is closed when pressed and connected in parallel to the first relay contact, and an open state when pressed A power-on switch having a normally-closed terminal and a common terminal is provided, and a common circuit of the first relay contact and the power-on switch is connected to a power supply switch on the common terminal side of the power-on switch. The control circuit is connected in series with the power supply such that the normally open terminal side of the power supply switch is connected to the control circuit, and the normally closed terminal side of the power-on switch is controlled in conjunction with the first relay contact. A power synchronization signal detection circuit is provided via a relay contact, and a power synchronization signal is input to the control circuit when the second relay contact is closed and the power-on switch is not pressed. The one in which the features.

When the power-on switch is pressed, power is supplied to the control circuit from the power supply via the normally open terminal, and the control circuit is activated. When the control circuit starts operating,
Even if the first relay contact is closed and the power-on switch returns to the normally closed terminal side, power is connected to the control circuit via the first relay contact. The self-holding is performed until a signal for opening the first relay contact is output from the control circuit.

Therefore, even if the power-on switch is opened after the normally open-circuit terminal is closed, the control circuit can maintain its operation and can continue to operate the load of the electric equipment and the like. Further, the second relay contact is linked with the first relay contact, and the control circuit operates by pressing the power-on switch, and then when the power-on switch returns to the normally closed terminal side, the control circuit A signal synchronized with the power supply is input. To interrupt the operation of the control circuit and shift to the standby state, press the power-on switch. By pressing the power-on switch, the normally closed terminal side is opened, so that the power-supply synchronization signal is not input. When the power supply synchronizing signal has not been input for a certain period, the control circuit opens the first relay contact and cuts off the power supply to the control circuit.

As described above, it is possible to switch between energization and cutoff of the control circuit with one switch.

According to a second aspect of the present invention, in the power supply control device according to the first aspect, a load circuit is connected to a power supply via a third relay contact controlled in conjunction with the first relay contact. It is characterized by doing.

Since a load circuit is not connected to the power-on switch, even when a short-circuit fault occurs in a load switching element such as a triac, a large current of the load circuit does not flow through the power-on switch. Fire and smoke (US) accidents can be prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the power supply control device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit configuration of an embodiment of a power supply control device according to the present invention when applied to control of a washing machine. In FIG. 1, reference numeral 1 denotes an AC power supply, which supplies electric power to a control device 2 and a load circuit such as a washing motor 3 controlled by the control device 2 and a phase advance capacitor 4, a drain valve 5, and a water supply valve 6.

The control device 2 includes a microcomputer 20a, a control circuit 20 including an electrically rewritable nonvolatile memory 20b, a control circuit 20,
An operation input display device 21 that supplies an operation input to the control circuit 20 and displays an output of the control circuit 20, a relay control coil 25a whose current supply is controlled by the control circuit 20, and a relay control coil 25a. A second relay contact 25b and a second relay contact 25c to be opened and closed, a relay control coil 28a controlled in conjunction with the relay control coil 25a,
The third relay contact 28b, which is controlled to open and close by a, and the first relay contact 25b in parallel (commonly referred to as COM).
The normally open (NO) terminal is the second relay contact 2
The power supply switch 261 such as a push button switch having a normally closed circuit (NC) terminal connected in series with 5c, and the AC power supply 1 is synchronized with the control circuit 20 via the COM-NC terminal of the power supply switch 261 and the relay contact 25c. A power supply synchronization signal detection circuit for inputting a signal, and a switching element 22 for controlling the operation of the washing motor 3, the phase advance capacitor 4, the drain valve 5 and the water supply valve 6 by the output of the control circuit 20.
a, 22b, 23 and 24.

Then, C of the power-on switch 261
The parallel circuit of the OM-NC terminal side and the first relay contact 25b is connected in series with the control circuit to connect the AC power supply 1
And the washing motor 3 and the switching element 22
a, a series circuit of 22b, a series circuit of the drain valve 5 and the switching element 23, and a series circuit of the water supply valve 6 and the switching element 24 are respectively connected in series with the third relay contact 28b to form the AC power supply. Connected to 1.

Accordingly, when the power-on switch 261 such as a push button switch is pressed, the control circuit 20 turns on the AC power source 1.
Is connected to the relay control coil 25a.
The first relay contact 25b and the second relay contact 25
c closes.

As a result, even if the contact of the power-on switch 261 returns to the COM-NC terminal side, the first relay contact 25b continues to be closed by self-holding. Is kept. Similarly, since the second relay contact 25c also remains closed, the power synchronization signal is input to the control circuit 20 by the power synchronization signal detection circuit 29 via the COM-NC terminal of the power switch 261. At the same time, the third relay contact 28b connected in series to the load circuit also keeps the closed state by self-holding.
In response to an instruction from the operation input display device 21 to the control circuit 20, such as switching of each step of washing, rinsing, dehydration, etc., switching of a course according to the type of clothing, operation or suspension of the washing step, etc. The control circuit 20 can control the washing motor 3, the drain valve 5, the water supply valve 6, and the like.

When the power-on switch 261 is pressed while the control circuit 20 is continuously energized, the NC terminal is opened, so that no power-supply synchronizing signal is input to the control circuit 20. As a result, the control circuit 20 controls the first relay contact 25b, the second relay contact 25c, and the third relay contact 2
The relay control coil 25a and the relay control coil 25b are controlled so that the control circuit 20 and the load circuit 8b are opened.

The current of the load circuit is supplied to a power-on switch 261.
When the power-on switch 261 is pressed when a semiconductor device such as a triac is short-circuited, a large current of the load does not flow and a dangerous accident such as smoking or ignition due to burnout of the switch is avoided. it can.

The non-volatile memory 20b provided in the control circuit 20 can hold information on load control such as a washing course and error information set by the user even when the power supply to the control circuit 20 is cut off. It is possible to reuse data that was previously input when the power was turned on again and before the previous use. The nonvolatile memory 20b may be built in the microcomputer 20a.

FIG. 2 is a diagram showing one embodiment of the display contents displayed on the operation input display device 21. As shown in FIG. Compared with the conventional embodiment of FIG. 5, the power off switch is abolished and replaced with a power on / off switch (power on switch 261). In FIG. 2, reference numeral 210 denotes a water level switch capable of switching the water level of a washing tub; 211, a process switch for selecting a washing process such as washing only, or rinsing and spin-drying or spin-drying only; Switch.

When the power-on switch 261 is pressed, the control circuit 20 is connected to the AC power supply 1 as described above, the energized state is held by the first relay contact 25b, and the switches of the operation input device 21 can be input. At the same time, the second relay contact 25c is closed, so that after the power-on switch 261 is released, a power synchronization signal is input to the control circuit 20 via the COM-NC terminal. When the start temporary stop switch 213 is pressed, the operation of the washing process is started, and the washing motor 3 and its phase advance condenser 4, drain valve 5, and water supply valve 6 are controlled in accordance with each process.

When the operation of the washing process is completed, the control circuit 20
The first relay contact 25b and the second relay contact 2
The relay control coils 25a and 28a are controlled so as to open the relay contact 5c and the third relay contact 28b.
The power supply to the control circuit 20 supplied from the AC power supply 1 via 5b is cut off. During the input of each switch of the operation input display device 21 or during the washing process, the power switch 21 is turned on.
6 is pressed, the operating load is stopped and the first relay contact 25b, the second relay contact 25c, and the third relay contact 28b are controlled to be opened, and the control circuit 20 is controlled.
Is turned off. 215 is each step of water level washing,
This is a display device that displays course setting contents and the like.

Next, the operation of the power supply control device of the present invention will be described with reference to the flowchart of FIG.

First, at step # 300, when the power supply switch 261 is pressed to turn on the control circuit 20, the relay contacts 25b, 25c and 28b are turned on at step # 310. At step # 320, the water level switch 210, the process switch 211, the course switch 212, etc. of the operation input display device 21 are operated to perform switch input processing.
If there is no input of the power synchronization signal in step # 330, the relay contacts 25b, 25c, and 28b are turned off in step # 380, and the connection of the AC power supply 1 is cut off.

If there is an input of the power supply synchronizing signal, the flow proceeds to step # 340, and if there is an input of the start temporary stop switch 213, the washing step of step # 350 is executed. Step # 360
If there is no input of the power supply synchronizing signal at step # 390, all the loads are turned off at step # 390, and the relay contact 25 at step # 380.
b, 25c and 28b are turned off to disconnect the AC power supply 1. If the power supply synchronization signal has been input, the process proceeds to step # 370, and the washing process is continued. If the washing process is completed in step # 370, the relay contacts 25b and
25c and 28b are turned off and the connection of the AC power supply 1 is cut off.

[0030]

Since the power supply control device of the present invention has the above configuration, the invention according to claim 1 can set both power-on and power-off with a single power-on switch, so that operability is improved. improves.

According to the second aspect of the present invention, since the load current does not pass through the power-on switch, the power-on switch is burned by the large current even if the power is turned on when the load switching element has a short-circuit fault. It can prevent accidents such as ignition and smoking.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a power supply control device according to the present invention.

FIG. 2 is an explanatory diagram of an operation input display device showing an embodiment of the power supply control device of the present invention.

FIG. 3 is a flowchart showing an operation of the power supply control device according to the embodiment of the present invention;

FIG. 4 is a block diagram showing an embodiment of a conventional power supply control device.

FIG. 5 is an explanatory diagram of an operation input display device showing an embodiment of a conventional power supply control device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 AC power supply 2 Controller 3 Washing motor 4 Phase capacitor 5 Drain valve 6 Water supply valve 20 Control circuit 20a Microcomputer 20b Non-volatile memory 22a Switching element 22b Switching element 23 Switching element 24 Switching element 25a Relay control coil 25b Relay contact 25c Relay Contact 26 Power-on switch (power-on switch) 27 Resistance 28a Relay control coil 28b Relay contact 29 Power-supply synchronization signal detection circuit 261 Power-on switch (power-on / off switch)

Claims (2)

[Claims] 1. A control circuit for controlling a load circuit, a first relay contact of a relay controlled by the control circuit, and a normally open circuit terminal which is connected in parallel to the first relay contact and is closed when pressed. And a power-on switch having a common terminal of a normally-closed terminal, a normally-opened terminal, and a normally-closed terminal. The control circuit is connected in series with the power supply switch so that the common terminal side of the power supply switch is connected to the power supply and the normally open terminal side of the power supply switch is connected to the control circuit, and the circuit is connected to the normally closed terminal side of the power supply switch. A power synchronization signal detection circuit is provided via a second relay contact that is controlled in conjunction with the first relay contact, and the second relay contact is closed and the power-on switch is pressed. A power supply control device for inputting a power supply synchronization signal to a control circuit when the power supply control signal is not present. 2. The power supply control device according to claim 1, wherein a third relay contact controlled in conjunction with said first relay contact is connected to a power supply in series with a load circuit.