JPS63117656A - Control circuit for electric apparatus - Google Patents

Abstract

PURPOSE:To prevent the temperature from abnormally rising by dividing the voltage of a commercial power source by a capacitor in a control circuit for an electric apparatus, thereby reducing heat generation. CONSTITUTION:A control circuit for an electric apparatus is composed of first, second power supplies 18, 21 for supplying a commercial power source 17, a power source smoothing unit 24, a detection switch 28 for detecting ON/OFF of a power switch 27, a power control element 30 for controlling the energization of a heater load 29, a control unit 31, and a drive circuit 33 of a display 32. In this case, the power supply 18 is composed of a capacitor 19 and a rectifying diode 20, and the power supply 21 is composed of a rectifying diode 22 and a resistor 23 to supply power to the smoothing unit 24 through the display 32. Thus, since the supply 18 is divided by the capacitor 19, its heat generation is reduced. Since a current for lighting the display 32 is supplied through the smoothing unit 24 to the unit 31, the current can be effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control circuit for electrical equipment such as electric carpets, electric blankets, etc., in which a control circuit for controlling temperature is housed in a controller box with a very limited space. It is related to.

Conventional technology In recent years, in order to add memory functions to control circuits, electrical equipment has become commonplace that supplies power to part of the control circuit even when not in use (the power switch is turned off). There is. A conventional example of a control circuit for such an electric device will be explained with reference to FIG. In Figure 3, 1 is a commercial power supply, 2
is a power supply unit that supplies commercial power 1, and is composed of a rectifier diode 3 and a resistor 4. Reference numeral 5 denotes a power supply smoothing unit that smoothes and constant voltages the power supplied from the power supply unit 2, and a capacitor 6
and a constant voltage diode 7. 8 is a power switch section, 9 is a detection switch that detects whether the power switch section 8 is on or off, 10 is a heater load, 11 is a power control element that controls energization of the heater load 10, and 12 is a sensor that detects the temperature of the heater load 10. a control unit 13 that controls the power control element 11;
14 is a display drive circuit that drives the display section 13 with a signal from the control section 12, and is composed of a resistor 15 and a transistor 16.

In the above configuration, when the power source of the electrical equipment is connected to the commercial power source 1, voltage is applied to the control section 12 via the power supply section 2 and the power smoothing section 5 regardless of whether the power switch section 8 is on or off. . In other words, this circuit configuration allows the control section 12 to have a memory function. When the power switch section 8 is on, the power switch section 8
The detection switch 9 that detects whether the is on or off is also turned on,
A power switch-on signal is input to the control unit 12. The control unit 12 controls the display drive circuit 14 in response to a power switch-on signal.
Outputs a High signal to. Therefore, the transistor 16 is turned on, the display section 13 lights up, and it can be recognized that the heater load 10 is under energization control.

Conversely, when the power switch unit 8 is off, the detection switch 9
In response to the power switch-on signal, a Low signal is output from the control section 12 to the display drive circuit 14, and the display section 13 becomes clear.

Problems to be Solved by the Invention However, when the control circuit of such electrical equipment is housed in a controller box with very limited space, such as an electric carpet or electric blanket, the power supply section 2
Due to the heat generated by the resistor 4, the entire Chondola Lab 7 becomes abnormally high temperature.

In particular, in the case of electric carpets and electric blankets, the controller/roller box section is often kept warm by a futon, cushion, etc., and this situation is extremely dangerous.

Further, even when the power switch section is turned off, the controller box becomes hot, giving the user a sense of anxiety. Therefore, in order to lower the temperature of the controller section, it is necessary to suppress the heat generation of the resistor 4 of the power supply section 2.
Sufficient current cannot be supplied to the control unit.

The present invention solves these conventional problems and provides a control circuit for electrical equipment that can supply sufficient current to the control section without increasing the temperature of the controller box section.

Means for Solving the Problems The control circuit for an electric appliance of the present invention includes a first power supply section that supplies commercial power to a power supply smoothing section via a capacitor and a rectifier diode, and a first power supply section that supplies commercial power to a power supply smoothing section through a resistor or a capacitor and a rectifier. Supplying power to the control unit from two power supply units of a second power supply unit that supplies power to the power supply smoothing unit via the diode and the display unit,
Turn the display section on and off according to the power switch section! The circuit configuration is as follows.

The control circuit for electrical equipment of the present invention reduces heat generation by dividing the voltage of the commercial power supply with a capacitor, and further uses the current for lighting the display section as the current for the control section, thereby controlling electric carpets, electric appliances, etc. Even when the controller box is housed in a very limited space such as a blanket, the degree of rutting in the controller box does not increase and sufficient current can be supplied to the control section.

Embodiment Hereinafter, a control circuit for an electrical device according to an embodiment of the present invention will be explained with reference to the drawings.

Reference numeral 17 denotes a commercial power supply, and 18 a first power supply section that supplies the commercial power supply 17, and is composed of a capacitor 19 and a rectifier diode 20. Reference numeral 21 denotes a second power supply unit that supplies the commercial power supply 17, and is composed of a rectifier diode 22 and a resistor 23. Reference numeral 24 denotes a power supply smoothing unit that smoothes and constant voltages the power supplied from the first power supply unit 18 and the second power supply unit 21, and the capacitor 2
5. Consists of a constant voltage diode 26. 27 is a power switch section, 28 is a detection switch that detects whether the power switch section 27 is on or off, 29 is a heater load, 30 is a power control element that controls energization of the heater load 29, and 31 is a sensor that detects the temperature of the heater load 29. 32 is a display section; 33 is a display drive circuit that drives the display section 32 with a signal from the control section 31; transistors 34 and 35;
, and resistors 36 and 37. 38 is a diode for discharging the capacitor 19, and 39 is a diode for preventing reverse voltage application to the display section 32.

In the above configuration, when the power supply of the electric device is connected to the commercial power supply 17, the control unit 31 is supplied with the first power supply unit 18, the second power supply unit 21, and the power supply regardless of whether the power switch unit 27 is on or off. A voltage is applied via the smoothing section 24 . In this way, the control section 31 is provided with a memory function. When the power switch unit 27 is on, the detection switch 28 that detects whether the power switch unit 27 is on or off is also turned on, and a power switch on signal is input to the control unit 31. The control unit 31 outputs a Low signal to the display drive circuit 33 in response to the power switch-on signal. Therefore, the transistor 35 is turned off, the transistor 34 is also turned off, the display section 32 lights up, and it can be recognized that the heater load 29 is being controlled to be energized by the signal from the control section 31.

Conversely, when the power switch section 27 is off, a high signal is output from the control section 31 to the display drive circuit 33 in response to the power switch off signal from the detection switch 28, the display section 33 becomes clear, and the heater load 29 is not energized. is also turned off. Since the first power supply section 18 divides the voltage using the capacitor 19, heat generation is extremely small. Also, the current that lights up the display section 32 is supplied from the second power supply section 21, and the current that lights up the display section 32 is ? [Since the current is supplied to the control unit 31 via the source smoothing unit 24, the current can be used very effectively.

FIG. 2 shows another embodiment. In this embodiment, the second power supply section 21 is also composed of a capacitor 40, and the rectifier diode 41 is connected to the first power supply section 18 and the second power supply section 21. It can be used in common with both, and can further reduce heat generation.

Effects of the Invention As described above, the control circuit for electrical equipment of the present invention can reduce heat generation by dividing the voltage of the commercial power supply using a capacitor, and can also use the current for lighting the display section as the current for the control section. The temperature of the controller box did not rise even when it was stored in a controller box with very limited space such as an electric carpet, electric blanket, etc., and the controller box part was kept warm with a futon, cushion, etc. This has the effect that the temperature does not rise abnormally even when the power switch is turned off, and the controller box does not become hot even when the power switch is turned off, allowing sufficient current to be supplied to the control unit. This is extremely advantageous in practice.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of an electric device according to an embodiment of the present invention, FIG. 2 is a control circuit diagram of an electric device according to another embodiment of the present invention, and FIG. 3 is a control circuit diagram of a conventional electric device. be. 17... Commercial power supply, 18... First power supply section, 21... Second power supply section, 24...
...Power supply smoothing section, 27...Power switch section,
31...Control unit, 32...Display unit, 3
3...Display drive circuit. Name of agent: Patent attorney Souo Nakao and 1 other person No. 3
figure

Claims (2)

[Claims] (1) A first power supply unit and a second power supply unit that supply power from a commercial power source to a control unit of an electrical device, and a power supply smoothing unit that smoothes the power supplied from the first power supply unit and the second power supply unit. a power switch unit that supplies commercial power to the load of the electrical equipment; a display unit that displays the on state of the power switch unit; and a display drive that drives the display unit depending on the on/off state of the power switch unit. The first power supply section supplies commercial power to the power smoothing section through a capacitor and a rectifier diode, and the second power supply section smoothes the commercial power through a resistor, a rectifier diode, and a display section. A control circuit for an electrical device, wherein the display drive circuit is turned off and the display section is operated when the power switch section is in an on state. (2) The control circuit for an electrical device according to claim 1, wherein the second power supply section is configured to supply commercial power to the power supply smoothing section via a capacitor, a display section, and a rectifier diode.