JPS6133205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device having two self-holding means and configured to control the operation of a switching element of a controlled circuit using a signal generated by the operation of the self-holding means. The present invention relates to a control device suitable for use as a power saving circuit for a temperature control device such as a blanket.

An embodiment in which a control device according to the present invention is used as a temperature control device for an electric blanket or the like will be described below with reference to the drawings.

In Figure 1, 1 is an AC power supply, 2 is a heating element, and 3
4 is a switching element (thyristor in the embodiment), 4 is a control circuit that controls the conduction of the thyristor 3, and the control circuit 4 is a temperature detection device having a heat sensitive body that senses the temperature change of the heating element 2 and detects it as an impedance change. circuit, a drive circuit that generates a drive pulse to drive the thyristor 3 in response to a change in the impedance of the heat sensitive body of the temperature detection circuit, etc.
The driving pulse of the driving circuit is supplied to the gate of the thyristor 3, and when the temperature of the heating element 2 reaches the maximum temperature, it is sensed by the heat sensitive element, and a signal to release the self-holding is supplied to the first self-holding means. It is something to do. 5 is a variable resistor for varying the energization rate;
The variable resistor 5 is connected to the control circuit 4 by changing the resistance value.
This controls the generation of drive pulses for the drive circuit. 6 is a DC power supply, 7, 13, 14, 20, 2
8, 29, 37 are diodes, 8, 10, 11,
15, 17, 18, 22, 23, 24, 27, 3
0, 32, 33, 35 are resistances, 9, 12, 16,
19, 21, 25, 31, 36, 38, 39 are
npn transistor, 26 is a push-on switch (a normally open switch that is closed only when pushed), 34 is a light emitting diode (hereinafter referred to as LED)
It is.

Further, a heating element 2 and a thyristor 3 are connected in series to the AC power supply 1 to form a main circuit, and a control circuit 4 is connected in parallel to the main circuit. The gate of the transistor 16 of the first self-holding means is connected to the drive circuit of the control circuit 4, and the base of the transistor 16 of the first self-holding means and the self-holding circuit of the control circuit 4 are connected to each other in order to supply a signal from the control circuit 4 to release the self-holding function. The supply terminal for the signal to release the hold is connected. Further, a variable resistor 5 is connected between the control circuit 4 and the cathode line (AC line) of the thyristor 3.

And the DC power supply 6 (the side terminal is connected to the thyristor 3
A first self-holding means A that maintains the temperature of the heating element 2 at the maximum temperature by a self-holding operation (connected to the cathode line of the first self-holding means A) and a self-holding operation when the first self-holding means A is released. At thyristor 3
A second self-holding means B is connected to keep the switch in the OFF state.

That is, transistors 9 and 12 are connected to a DC power supply 6 via a resistor 8, and the connecting end of the transistors 9 and 12 and the resistor 8 is connected to the base of a transistor 16 via a series circuit of a resistor 11 and a diode 14. has been done.

The transistor 16 is also connected to the DC power supply 6 via the resistor 15. Further, the base of the transistor 9 is connected to the collector of the diode 16 through a series circuit of a resistor 10 and a diode 7, thereby forming a first self-holding means. The collector of the transistor 16 is connected to the base of a transistor 19 via a resistor 17 and to the base of a transistor 38 via a resistor 18. The transistor 19 is connected to both ends of the variable resistor 5 (parallel to the variable resistor 5), and the transistor 38 is connected between the base and emitter of the transistor 39.

The transistor 39 is the gate of the thyristor 3.
Connected between cathodes. Further, the base of the transistor 12 is connected via a diode 13 to a connection end between a resistor 27 and a diode 28 of the second self-holding means B.

Furthermore, transistors 21 and 25 are connected to the DC power supply 6 via a resistor 22, and the connection terminals between the transistors 21 and 25 and the resistor 22 are connected to the resistor 24,
It is connected to the base of a transistor 31 via a series circuit of a diode 29, and the transistor 31 is also connected to the DC power supply 6 via a resistor 30.

The base of the transistor 21 is connected to the transistor 3 through a series circuit of a resistor 23 and a diode 20.
1 collector. transistor 2
The base of 5 is push-on switch 26, resistance 2
7. It is connected to the side terminal of the DC power supply 6 via a series circuit of diodes 28. And it constitutes the second self-holding means B. Further, the collector of the transistor 31 is connected to the base of a transistor 36 via a resistor 32, and to the base of a transistor 39 via a series circuit of a resistor 33 and a diode 37.
4. Connected to the DC power supply 6 via a series circuit of a resistor 35.

In addition, in Fig. 2, A shows the temperature characteristics of the heating element 2 when the push-on switch 26 is turned on (when the self-holding means is operated), and B shows the temperature characteristic when the push-on switch 26 is not turned on. In the temperature characteristics, C is the room temperature (initial temperature), B is the temperature arbitrarily selected by the variable resistor 5 for temperature adjustment, B is the maximum temperature that can be set by the variable resistor 5, and a
is the time until the operation of the first self-holding means is released (the time during which the first self-holding means is operating).

The operation of the control device having the above configuration will be described when it is applied to a temperature control device such as an electric blanket and the variable resistor 5 is used as a variable resistor for temperature adjustment.

(Temperature) When the control device is connected to the AC power supply 1, the thyristor 3 is made conductive by a signal from the control circuit 4, and the heating element 2 is energized, and the temperature is set to the temperature selected by the temperature control variable resistor 5. When this temperature is reached, the thyristor 3 is repeatedly turned ON and OFF by a control signal from the control circuit 4 including a temperature detection circuit having a heating element, and the temperature of the heating element 2 is kept constant. At this time, the temperature characteristic of the heating element 2 is as shown in the characteristic B in FIG. Body temperature remains constant.

However, when the power was first turned on, the push-on switch 26
When is pushed on, two self-holding means operate. That is, by closing the push-on switch 26, the push-on switch 26, the resistor 27,
Since the base current flows to the transistor 25 via the diode 28 and to the transistor 12 via the push-on switch 26, the resistor 27, and the diode 13, the transistor 12 and the transistor 25 are turned on. Then, the transistor 1
The collector potentials of transistors 2 and 25 become zero, and the base current no longer flows to transistor 16 and transistor 31 (until then, in the case of transistor 16, the current flows through resistors 8 and 11 and diode 14, and to transistor 31, it flows through resistor 22). , 24 and diodes 29, and the transistors 16 and 31 are in the ON state), the transistors 16 and 31 are in the OFF state. Then, the base of transistor 9 has resistors 15, 10,
The base current flows through the base of the transistor 21 through the diode 7, the resistors 30 and 23, and the diode 20, so the transistors 9 and 2
1 is in the ON state. Therefore transistors 9,1
The collector potential of transistor 2 and the collector potential of transistors 21 and 25 remain zero, and this state continues even if push-on switch 26 is opened. That is,
This means that the first and second self-holding means A and B have operated (self-holding).

Therefore, due to the operation of the first self-holding means A, a base current flows to the base of the transistor 19 via the resistors 15 and 17, and the transistor 19 is turned on, so that the variable resistor 5 is electrically shorted.
This means that the variable resistor 5 has been set to the highest temperature (regardless of the value of the variable resistor 5). In addition, the base current flows to the transistor 38 via the resistors 15 and 18, and the transistor 38
is also in the ON state, so the second self-holding means B
Due to this operation, a base current attempts to flow to the transistor 39 via the resistors 30, 33 and the diode 37, but it is short-circuited by the ON of the transistor 38, and the transistor 39 is in the OFF state. Further, by the operation of the second self-holding means B, the transistor 36
The base current flows through the resistors 30 and 32 to the base of the transistor 36, and the transistor 36 is in the ON state.
Current also flows through resistor 35 and transistor 34 to turn on the LED, which turns on push-on switch 2.
Displays that 6 is turned on.

Since the variable resistor 5 is electrically short-circuited by the operation of the first self-holding means A as described above, the thyristor 3 continues to be turned on by the signal from the control circuit 4, and the heating element 2 As shown in time A in Figure 2, the indoor temperature rises from C to the maximum temperature A. Then, the thyristor 3 is turned OFF by a control signal from the control circuit 4, but at the same time, a signal from the control circuit 4 is applied to the base of the transistor 16, and the transistor 16 is inverted to the ON state. Then, the collector potential of the transistor 16 decreases to zero, so that no base current flows to the base of the transistor 9, and the transistor 9 is inverted to the OFF state. Then, the collector potentials of transistors 9 and 12 rise, and therefore transistor 16 has resistors 8 and 11,
A base current flows through the diode 14 to keep the transistor 16 on. That is, the operation of the first self-holding means A has been released. Therefore, the base current does not flow to the transistors 19 and 38, and the transistors 19 and 38 are also turned off.
The short circuit of variable resistor 5 is released. Furthermore, when the transistor is turned off, the signal from the second self-holding means B is applied to the base of the transistor 39 via the resistors 30 and 33 and the diode 37, so the transistor 39 is turned on, and therefore the thyristor 3
Since the gate cathode of is electrically short-circuited by the transistor 39, the thyristor 3 maintains the OFF state (this continues until the DC power supply 6 is released).

Therefore, in characteristic A of FIG. 2, when the period a during which the heating element 2 reaches the maximum temperature A (the period during which the first self-holding means A is operating) has elapsed, the temperature of the heating element 2 decreases. The room temperature (initial temperature) drops to C, and this state is maintained (this means that the DC power supply 6
(continues until cleared).

This uses an electric blanket, which stays warm until the maximum temperature is reached, but then the thyristor 3 is turned off and the blanket is no longer energized. Since you don't need much warmth while you sleep, you can save electricity by automatically turning off the electricity during that period.

In addition, when the push-on switch 26 is not turned on, it can of course be used as a normal electric blanket, making it possible to provide a very convenient electric blanket for the user.

Since the control device of the present invention has the above-described configuration, it can reliably control a predetermined state by simply operating the two self-holding means, and can reliably perform heating operation up to the maximum temperature and power saving operation thereafter. can be done.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of the control device according to the present invention, and FIG. 2 is a diagram showing a heating element when the control device according to the present invention shown in FIG. 1 is applied to a temperature control device such as an electric blanket. It is a temperature characteristic diagram. 2: heating element, 3: switching element, 4: control circuit, 5: variable resistor, A, B: self-holding means.

Claims (1)

[Claims] 1. A switching element that controls the energization of the heating element, a switching element control means including a energization rate variable device that varies the energization rate of the switching element, and a signal that is self-maintained manually or automatically and that is generated by the self-maintenance of both. and two self-holding means for holding the switching element control means in a predetermined state, and one of the self-holding means controls the switching element control means in a self-holding operation so that the temperature of the heating element is maintained. While maintaining the state at the maximum temperature, the self-holding is canceled by a signal generated by the operation of the switching element control means, and when the self-holding is released, the other self-holding means maintains the switching element in the OFF state by self-holding operation. A control device characterized in that it is configured to: