JP2002270075A - Relay drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a high voltage to the coil part of a relay part, eliminate the need of remarkably reducing the voltage, and reduce a power consumption by a resistance. SOLUTION: This relay drive device comprises a switching part 2 for turning on and off an output voltage from a power supply part 1 for outputting a DC voltage and a relay part 4 for turning on and off a power supplied to a load part 7. The switching part 2 is switched according to the frequency of the output voltage from the power supply part 1, and the switched DC voltage is applied to the coil part 5 of the relay part 4 to turn on the relay part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay driving device for controlling a load by mounting a relay on an apparatus such as an iron.

[0002]

2. Description of the Related Art Conventionally, as this kind of relay drive device, for example, those shown in FIGS. 17 and 18 have been proposed. A conventional example will be described with reference to FIGS.

VAC is a commercial AC power supply, D4 is a diode for rectifying the commercial AC power supply VAC, and R3 is a commercial AC power supply V
C2 is a smoothing capacitor for smoothing the rectified voltage and converting it to a DC voltage, and ZD1 is a resistor R3 for converting the DC voltage to an appropriate voltage value. The power supply unit 28 is constituted by the Zener diode to be set. The transistor Q <b> 3 forms a switching unit 29 that turns on and off a voltage applied to the coil unit RLC of the relay unit 31, and is controlled by the driving unit 30.

[0004] The diode D3 absorbs a surge voltage generated between the coil portions RLC when the transistor Q3 is turned off, and protects the transistor Q3. RLS
Is a contact portion of the relay portion 31. When the transistor Q3 is turned on, a current flows through the coil portion RLC, the contact portion RLS is turned on by electromagnetic force, and power from the commercial AC power supply VAC is supplied to the heater portion 33 constituting the load portion. Is done. Drive unit 30
Controls the switching unit 29 as described above. In this case, when a low-level voltage is output, the transistor Q3 is turned on and the relay unit 31 is turned on. When a high level voltage is output, the transistor Q3
Is turned off, and the relay unit 31 is turned off.

FIG. 19 shows a voltage VRLC applied to the coil portion RLC of the relay portion 31. Coil portion RL at time T1
C, a DC voltage is applied, and the relay unit 31 is turned on. During the period when the voltage is applied, the relay unit 31 is kept on, and at time T2, the voltage VRLC to be applied is set to zero, and the relay unit 31 is turned on.
Turns off.

[0006]

However, in such a configuration, it is necessary to set the current flowing through the coil portion RLC to an appropriate value in order to turn on the relay portion 31. Since the voltage applied to the RLC is a continuous application of a DC voltage, it must be set to a low voltage. Therefore, the resistor R3 and the Zener diode ZD
1, the voltage is set.
In this case, the power consumed by the resistor R3 and the Zener diode ZD1 becomes large and the heat generated is large.

Further, the current value flowing through the coil portion RLC cannot be changed once it is set. If the power supply voltage is set to the optimum current value at the rated voltage of the power supply voltage, the current flows too much if the power supply voltage becomes high. In addition, if the voltage becomes low, the current becomes insufficient.

[0008]

According to the present invention, in order to solve the above-mentioned problems, the switching section is turned on and off in accordance with the cycle of the output voltage of the power supply section, and the cut-off DC voltage is applied to the coil section of the relay section. Then, the relay section is turned on, and the voltage application is interrupted while the current flowing through the coil section rises because the voltage application time is short, so that a period in which no voltage is applied enters. When no voltage is applied, the coil unit discharges the electromagnetic energy stored by the previous voltage application through the diode unit connected in parallel with the coil unit, and supplies current to the coil unit to keep the relay unit on. It is.

Accordingly, a high voltage can be applied to the coil portion, and it is not necessary to greatly reduce the voltage as in the conventional example, and the power consumption of the resistor and the like can be set small.

In the pulse section for controlling the switching section, the time for applying a voltage to the coil section of the relay section is set longer than when the relay section is turned on from off and when the relay section is kept on. Things. Thus, the current flowing through the coil section can be changed, and the setting of the current value can be easily changed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a power supply unit for outputting a DC voltage, a switching unit for turning on and off an output voltage of the power supply unit, and a pulse for controlling the switching unit. Unit, a load unit, a relay unit for turning on / off the power supplied to the load unit, a coil unit of a relay unit for supplying an output voltage of the switching unit, and a coil unit of the relay unit connected in parallel. A switching unit that switches on and off according to the cycle of the output voltage of the power supply unit, applies the switched DC voltage to the coil unit of the relay unit, and turns on the relay unit. The power consumption such as resistance can be reduced, and the current flowing through the coil of the relay unit can be freely changed.

According to a second aspect of the present invention, in the first aspect of the present invention, the pulse section sets a time for applying a voltage to the coil section of the relay section when the relay section is turned on from off. When the relay unit is turned on from off, a large current can be passed through the coil unit of the relay unit, and the relay unit can be reliably turned on. When the switch is kept on, the power consumption can be reduced by reducing the current and the heat generation can be suppressed.

According to a third aspect of the present invention, in the first aspect of the present invention, the pulse section sets a time when no voltage is applied to the coil section of the relay section when the relay section is turned on from off. It is set to be shorter than the time for which the relay section is kept on, so that a large current can flow through the coil section of the relay section when the relay section is turned on from off, and the relay section can be reliably turned on. When the switch is kept on, the power consumption can be reduced by reducing the current and the heat generation can be suppressed.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the voltage detecting section detects the magnitude of the output voltage of the commercial AC power supply or the magnitude of the output voltage of the power supply section. The output of the voltage detection unit is configured to be input to the pulse unit, and the magnitude of the output voltage of the commercial AC power supply or the magnitude of the output voltage of the power supply unit causes a voltage to be applied to the coil unit of the relay unit. The time during which the voltage is applied or the time when the voltage is not applied is changed, and the value of the output voltage of the commercial AC power supply or the value of the output voltage of the power supply changes the current flowing through the relay coil. There is no increase in power consumption such as resistance due to voltage rise.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a temperature detecting section for detecting a temperature of the relay section is provided, and an output of the temperature detecting section is inputted to a pulse section. The time for applying a voltage to the coil portion of the relay portion or the time for not applying the voltage is changed according to the temperature of the relay portion, and the resistance of the coil portion increases due to the temperature rise of the coil portion. Even so, a current corresponding thereto can be passed through the coil portion, and the relay portion can be reliably turned on.

According to a sixth aspect of the present invention, in the first aspect of the present invention, there is provided a current detecting section for detecting a current flowing through the coil section of the relay section, and the output of the current detecting section is pulsed. The voltage is applied to the coil section of the relay section, and the time for applying a voltage to the coil section of the relay section or the time for not applying the voltage is changed depending on the magnitude of the current flowing through the coil section. The relay can be reliably turned on even with fluctuations and variations in the relay, and the power consumption is low.

According to a seventh aspect of the present invention, in the first aspect of the present invention, there is provided a resistance detecting section for detecting a resistance value of a coil section of the relay section, and an output of the resistance detecting section is pulsed. The time for applying a voltage to the coil portion of the relay portion or the time for not applying the voltage is changed according to the resistance value of the coil portion, and the resistance value of the coil portion of the relay portion is changed. For this variation, the relay section can be reliably turned on, and the power consumption can be reduced.

The invention according to claim 8 is the invention according to claim 1, further comprising a coil voltage detecting section for detecting a voltage between the coil sections of the relay section, and an output of the coil voltage detecting section. Is input to the pulse section, and the time for applying the voltage to the coil section of the relay section or the time for not applying the voltage is changed depending on the magnitude of the voltage between the coil sections. In addition, the relay unit can be reliably turned on with respect to variations in the relay unit, and the power consumption can be reduced.

According to a ninth aspect of the present invention, in accordance with the first aspect of the present invention, there is provided a state detecting section for detecting a use state of the device such as an iron, and an output of the state detecting section is supplied to a pulse section. It is configured to input, by the output of the state detection unit, the time to apply a voltage to the coil unit of the relay unit, or to change the time to not apply,
An electric current according to use or non-use of an iron or the like can be passed through the relay section, and the relay section can be reliably turned on and power consumption can be reduced.

According to a tenth aspect of the present invention, in the first aspect of the present invention, an impact detecting unit for detecting an impact of a device such as an iron is provided, and an output of the impact detecting unit is input to a pulse unit. The time for applying a voltage to the coil portion of the relay portion or the time for not applying the voltage is changed by the output of the impact detection portion. On the other hand, the relay section can be reliably turned on.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same components as those in the conventional example are denoted by the same symbols, and description thereof is omitted.

(Embodiment 1) As shown in FIGS.
A power supply unit rectifies a commercial AC power supply VAC with a diode D2 and converts the commercial AC power supply VAC into a DC voltage with a resistor R1 and a capacitor C1. This DC voltage is turned on and off by the transistor Q1 forming the switching unit 2, and is applied to or cut off from the coil unit 5 (RLC) forming the relay unit 4, thereby turning off the coil unit 5 of the relay unit 4. DC voltage is intermittently applied to (RLC).

The diode section 6 (D1) is connected in parallel to the coil section RLC of the relay section 4, and uses the electromagnetic energy stored during the previous application of the voltage during a period in which no voltage is applied to the coil section RLC, to store the diode section 6 (D1). A current is passed through (D1) to keep the relay unit 4 on. Reference numeral 3 denotes a pulse section, and the output voltage of the pulse section 3 turns on and off the transistor Q1. Reference numeral 7 denotes a load unit including a heater or the like. When the coil unit RLC is turned on, the contact unit RLS is turned on, and power is supplied to the load unit 7 from the commercial AC power supply VAC.

FIG. 3 shows an output voltage (a) of the transistor Q1 when the transistor Q1 is turned on and off, a current i1 (b) flowing through the coil RLC with a voltage applied to the coil RLC when the transistor Q1 is turned on, When Q1 is off and the electromagnetic energy stored in the coil portion RLC is discharged, the current i2 (c) flowing through the coil portion RLC and the diode D1, and the current i flowing through the coil portion RLC
3 shows a waveform of RLC (d). Time t1 is the time when the transistor Q
1 is turned on, and the transistor Q1 is turned off during the time t2 when the DC voltage is applied to the coil unit RLC, and the coil unit RLC is turned off.
This is the time when no voltage is applied to LC.

As shown in FIG. 3B, the coil portion RLC
Current flowing through the coil portion RL from when the voltage is applied
Flows out gradually with a time constant determined by the inductance of C,
After the time t1, the transistor Q1 turns off, and the current supplied from the power supply unit 1 becomes zero. The current supplied from the power supply unit 1 is denoted by i1 and is shown in FIG. Transistor Q1
Is turned off, a current flows from the coil portion RLC to the diode D1 and the coil portion RLC due to the electromagnetic energy accumulated in the coil portion RLC. This current is defined as i2 and FIG.
It is shown in (c). The sum of the currents i1 and i2 is the coil portion RL
C, and this current is referred to as iRLC in FIG.
(D).

As described above, even if a high voltage is applied to the coil portion RLC, the transistor Q1 is turned off and the voltage application is cut off shortly before the saturation current at this voltage is reached. Absent. By setting the time t1 when the transistor Q1 is turned on and the time t2 when the transistor Q1 is turned off, the current iRLC flowing through the coil portion RLC can be set to an optimum value.

Although the embodiment in which the diode section 6 is constituted by the diode D1 has been described, it may be constituted by using a transistor or the like instead of the diode D1.

(Embodiment 2) FIG. 4 shows the output voltage (a) of the transistor Q1 and the current iRLC flowing through the coil portion RLC.
(B) shows the operation (c) of the relay unit 4. When the relay unit 4 is turned on from the off state, the current iRLC flowing through the coil unit RLC can be increased by setting a longer time period t3 for turning on the transistor Q1 and a shorter time period t4 for turning off the transistor Q1. At time T1 when the value of the relay impressing current IK to be turned on is exceeded, the relay unit 4 is turned on. Once the relay unit 4 is turned on, this ON state is maintained by a current smaller than the sensing current IK and a holding current IK.
It suffices that a current of H or more is caused to flow through the coil portion RLC. The current can be reduced by setting the ON time t5 of the transistor Q1 to be short and the OFF time t6 to be long.

As described above, when the relay section 4 is turned on from off, the on-time t3 of the transistor Q1 is reduced to t5.
Longer, the off time t4 is set shorter than t6, and once turned on, the on time t5 is set shorter than t3, and the off time t6 is set longer than t4, so that the relay section is reliably turned on from off. Once turned on, current can be reduced, power consumption can be suppressed, and heat generation can be suppressed.

(Embodiment 3) As shown in FIGS. 5 and 6, the magnitude of the output voltage of the power supply unit 1 is detected by the voltage detection unit 10, and the output of the voltage detection unit 10 is input to the pulse unit 9. . This operation will be described with reference to FIGS. When the output voltage of the commercial AC power supply is low, the output voltage of the power supply unit 1 is also low,
Based on the output of the voltage detection unit 10 that has detected this voltage, the pulse unit 9 causes the switching unit 2 to set the switching unit 2 on time t7 longer than t9 and off time t8 at t10.
The switching unit 2 is driven so as to be shorter. Further, when the output voltage of the power supply unit becomes high, the switching unit 2 is driven such that the time t9 when the switching unit 2 is turned on is shorter than t7 and the time t10 when the switching unit 2 is turned off is set longer than t8.

Therefore, the current flowing through the coil portion RLC is:
The relay unit 4 can be operated stably even when the output voltage of the power supply unit 1 is high or low, and the current flowing through the power supply unit 1 and the like can be set constant and the power consumption can be set small. Things.

The output voltage of the commercial AC power supply is detected,
When the output voltage of the commercial AC power source is high or low, the current flowing through the coil portion RLC of the relay portion 4 can be kept constant.
Naturally, this is included in the present invention.

(Embodiment 4) As shown in FIG. 7, reference numeral 12 denotes a temperature detecting section for detecting the temperature around the relay section 4 or the electronic circuit section on which the relay section 4 is mounted.

The output of the temperature detecting section 12 is supplied to the pulse section 11
When the temperature of the relay section 4 rises, the pulse section 11 causes the switching section 2 to increase the on-time and shorten the off-time, and when the temperature decreases, shorten the on-time and increase the off-time. To set. this is,
Since the resistance of the coil section 5 of the relay section 4 increases at a rate of about 0.4% / ° C. due to an increase in temperature, the current flowing through the coil section 5 is adjusted accordingly to optimize the driving. The conditions are kept.

(Embodiment 5) As shown in FIG. 8, reference numeral 14 denotes a current detection unit for detecting a current flowing through the coil unit 5 of the relay unit 4. The output of the current detection unit 14 is input to the pulse unit 13, and when the current of the coil unit 5 is large, the pulse unit 13 shortens the time for turning on the switching unit 2,
When the current is small, the time for turning on the switching unit 2 is lengthened, and the time for turning off the switching unit 2 is shortened.
A constant current flows regardless of the output voltage fluctuation of the power supply unit 1.

(Embodiment 6) As shown in FIG. 9, reference numeral 16 denotes a resistance detecting section for detecting the resistance value of the coil section 5 of the relay section 4. The output of the resistance detection unit 16 is input to the pulse unit 15, and the ON / OFF time at which the output pulse from the pulse unit 15 drives the switching unit 2 is optimally set according to the resistance value of the coil unit 5.

(Embodiment 7) As shown in FIG. 10, reference numeral 18 denotes a coil voltage detecting unit for detecting a voltage applied to the coil unit 5 of the relay unit 4. Coil voltage detector 18
Are output to the pulse section 12 and the driving conditions (on / off time) of the switching section 2 are changed by the output from the pulse section 17 depending on the magnitude of the voltage applied to the coil section 5. This eliminates the effects of variations in the resistance of the coil unit 5, fluctuations in the power supply voltage, temperature rises in the coil unit 5, and the like, and enables optimal driving of the relay unit 4.

(Embodiment 8) This embodiment is an example in which the present invention is applied to an iron. As shown in the block diagram of FIG. 11, reference numeral 20 denotes a state detection unit which detects whether ironing is being performed using an iron or whether the iron is stationary without using the iron. The output of the state detection unit 20 is output to the pulse unit 1
9 and the coil unit 5 according to the use state of the iron.
The current to be supplied to the device is varied.

FIG. 12 shows an embodiment of the state detecting section 20. FIG. 13 shows a conceptual diagram of ironing. In FIG. 12, reference numeral 23 denotes a printed circuit board on which an electronic circuit is mounted, and a case 21 having an inclined bottom surface is mounted on the printed circuit board 23. A photo-interrupter 24 is mounted on the bottom of the case 21, and a ball 22 is rollably placed in the case. These mounted electronic circuit parts are provided on the handle part 25 of the iron body 25 shown in FIG.
a.

When ironing, the iron moves back and forth and right and left, and this movement causes the ball 22 to move inside the case 21. If you are stationary without using an iron, the ball 22
Is stationary on the photointerrupter 24, light emitted from the LED constituting the photointerrupter 24 is reflected by the sphere 22,
The other component of the photointerrupter 24 is input to the phototransistor Q2.

FIG. 14 shows a circuit diagram of the photo interrupter. Power is supplied from the collector of the phototransistor Q2 via the resistor R2. Therefore, when light enters the phototransistor Q2 and the phototransistor Q2 is turned on, the collector voltage of the phototransistor Q2 becomes zero, and when light is not entered and the phototransistor Q2 is turned off, the collector voltage becomes high level. Therefore, when the ball 22 rolls on the photointerrupter 24 using an iron, the phototransistor Q2 repeatedly turns on and off, and the collector voltage VOUT of the phototransistor Q2 repeatedly outputs a high level and a low level.

When the phototransistor Q2 is left without using the iron, the phototransistor Q2 remains on or off. When the iron is left horizontal, a ball 22
Is stationary on the photointerrupter, the light emitted from the LED is reflected by the sphere 22, enters the phototransistor Q2, the phototransistor Q2 is turned on, VOUT is at a zero level, and the iron is set up in a vertical state with the iron. When the sphere 22 is stationary, the sphere 22 is stationary at a position away from the photointerrupter 24, and the light emitted from the LED is
2, the phototransistor Q2 is turned off, and the collector voltage VOUT of the phototransistor Q2 maintains a high level.

FIG. 15 shows the output voltage waveform. (A)
Is in use and (b) is stationary. This output voltage is input to the pulse unit 19, and when the iron is being used, the relay unit 4 is set to increase the current of the coil unit 5 due to mechanical vibration and impact (the ON time of the switching unit 2). And the off time is shortened), and the current of the coil unit 5 is set to be small (the on time of the switching unit 2 is shortened and the off time is increased) when the motor is at rest, thereby reducing power consumption and heat generation. Like that. Alternatively, the intensity of the movement of the iron may be detected based on whether the number of pulses shown in FIG. 15A is large or small, and the current flowing through the coil unit 5 of the relay unit 4 may be varied accordingly.

(Embodiment 9) This embodiment is also an example applied to an iron. As shown in the block diagram of FIG. 16, reference numeral 27 denotes an impact detection unit composed of a piezoelectric element or the like, which detects a mechanical impact applied to the iron. I do. That is, during use of the iron, the iron base 25b may be occasionally set up to correct the clothes to be ironed. The impact at the time of putting the iron may be a large impact depending on the person to be ironed. The magnitude of this impact is detected and input to the pulse unit 26, and the magnitude of the impact is determined by the person who uses the iron in the coil unit 5 in advance. A current is supplied so that the contact RLS of the relay unit 4 does not come off during use of the iron.

[0045]

As described above, according to the first aspect of the present invention, a power supply for outputting a DC voltage, a switching unit for turning on and off an output voltage of the power supply, and a switching unit A pulse section, a load section, a relay section that turns on and off the power supplied to the load section, a coil section of a relay section that supplies an output voltage of the switching section, and a coil section of the relay section. A diode unit connected in parallel, the switching unit is intermittent according to the cycle of the output voltage of the power supply unit, and applies the intermittent DC voltage to the coil unit of the relay unit, the relay unit Is turned on, power consumption such as resistance can be reduced, and the current flowing through the coil of the relay unit can be freely changed.

According to the second aspect of the present invention, the pulse section sets a time for applying a voltage to the coil section of the relay section.
When the relay unit is turned on from off, it is set longer than when the relay unit is kept on, so that a large current can flow through the coil unit of the relay unit when the relay unit turns on from off, and it is ensured. The relay unit can be turned on, and when the relay unit is kept on, the current is reduced to reduce power consumption and suppress heat generation.

According to the third aspect of the present invention, the pulse section keeps the relay section on when the relay section is turned on from the time when no voltage is applied to the coil section of the relay section. Because the time is set shorter than the time, a large current can flow through the coil of the relay unit when the relay unit turns from off to on, and the relay unit can be turned on without fail. By doing so, power consumption can be reduced and heat generation can be suppressed.

According to the fourth aspect of the present invention, there is provided a voltage detecting section for detecting the magnitude of the output voltage of the commercial AC power supply or the magnitude of the output voltage of the power supply section. The output is configured to be input to the pulse section, and the magnitude of the output voltage of the commercial AC power supply, or the magnitude of the output voltage of the power supply section, the time for applying the voltage to the coil section of the relay section, or not applying the voltage. Since the time is changed, the value of the output voltage of the commercial AC power supply or the value of the output voltage of the power supply does not change the current flowing through the coil of the relay unit. There is no increase in power consumption.

According to the fifth aspect of the present invention, there is provided a temperature detecting section for detecting a temperature of the relay section, and an output of the temperature detecting section is configured to be inputted to a pulse section. The time for applying or not applying voltage to the coil part of the relay part is changed according to the temperature, so even if the resistance of the coil part rises due to the temperature rise of the coil part, a current corresponding to that rises to the coil part. Can flow,
The relay can be reliably turned on.

According to the invention described in claim 6, there is provided a current detecting section for detecting a current flowing through the coil section of the relay section, and the output of the current detecting section is inputted to the pulse section, Depending on the magnitude of the current flowing through the coil,
Since the time for applying voltage to the coil of the relay unit or the time for not applying voltage is changed, power supply voltage fluctuation,
The relay can be reliably turned on even with temperature fluctuations and variations in the relay, and power consumption can be reduced.

According to the seventh aspect of the present invention, there is provided a resistance detecting section for detecting a resistance value of the coil section of the relay section, wherein an output of the resistance detecting section is inputted to a pulse section, The time for applying a voltage to the coil of the relay unit or the time for not applying the voltage is changed depending on the resistance value of the coil unit, so that the relay unit is reliably turned on with respect to the variation in the resistance value of the coil unit of the relay unit. Can be
In addition, power consumption can be reduced.

According to the invention described in claim 8, a coil voltage detecting section for detecting a voltage between the coil sections of the relay section is provided, and an output of the coil voltage detecting section is inputted to the pulse section. The time for applying a voltage to the coil of the relay unit or the time for not applying the voltage is changed according to the magnitude of the voltage between the coil units. The relay unit can be turned on quickly, and the power consumption can be reduced.

According to the ninth aspect of the present invention, there is provided a state detecting unit for detecting a use state of a device such as an iron,
The output of the state detection unit is configured to be input to the pulse unit, and the time for applying a voltage to the coil unit of the relay unit or the time for not applying the voltage is changed according to the output of the state detection unit. A current corresponding to use or non-use of the device can be passed through the relay unit, and the relay unit can be reliably turned on and power consumption can be reduced.

According to the tenth aspect of the present invention,
It has an impact detection unit that detects the impact of the device such as an iron, and is configured to input the output of the impact detection unit to the pulse unit,
By applying the output of the impact detection unit, the time for applying a voltage to the coil unit of the relay unit, or the time during which the voltage is not applied is changed, so that the relay unit reliably responds to vibrations and impacts when using equipment such as an iron. Can be turned on.

[Brief description of the drawings]

FIG. 1 is a block diagram of a relay driving device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the relay driving device.

FIG. 3 is an operation time chart of the relay drive device.

FIG. 4 is an operation time chart of the relay drive device according to the second embodiment of the present invention.

FIG. 5 is a block diagram of a relay driving device according to a third embodiment of the present invention.

FIG. 6 is an operation time chart of the relay drive device.

FIG. 7 is a block diagram of a relay driving device according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram of a relay driving device according to a fifth embodiment of the present invention.

FIG. 9 is a block diagram of a relay driving device according to a sixth embodiment of the present invention.

FIG. 10 is a block diagram of a relay driving device according to a seventh embodiment of the present invention.

FIG. 11 is a block diagram of a relay driving device according to an eighth embodiment of the present invention.

FIG. 12 is an essential part cross-sectional view showing one embodiment of a state detection unit of the relay drive device;

FIG. 13 is a conceptual diagram of an ironing operation of the iron having the relay driving device.

FIG. 14 is a circuit diagram of a photointerrupter of a state detection unit of the relay drive device.

FIG. 15A is an operation time chart of the state detection unit of the relay drive device when the iron is in use; and FIG. 15B is an operation time chart of the state detection unit of the relay drive device while the iron is at rest.

FIG. 16 is a block diagram of a relay driving device according to a ninth embodiment of the present invention.

FIG. 17 is a block diagram of a conventional relay driving device.

FIG. 18 is a circuit diagram of the relay drive device.

FIG. 19 is an operation time chart of the relay drive device.

[Explanation of symbols]

 Reference Signs List 1 power supply section 2 switching section 3 pulse section 4 relay section 5 coil section 6 diode section 7 load section

Claims (10)

[Claims] 1. A power supply section for outputting a DC voltage, a switching section for turning on and off an output voltage of the power supply section, a pulse section for controlling the switching section, a load section, and electric power supplied to the load section. A relay unit that turns on and off, a coil unit of a relay unit that supplies an output voltage of the switching unit, and a diode unit that is connected in parallel to the coil unit of the relay unit. A relay drive device that is turned on and off in accordance with the cycle of the output voltage of the unit, and applies the intermittent DC voltage to the coil unit of the relay unit to turn on the relay unit. 2. The pulse section according to claim 1, wherein the time for applying a voltage to the coil section of the relay section is set to be longer when the relay section is turned on from off than when the relay section is kept on. Relay drive. 3. The pulse section according to claim 1, wherein a time during which no voltage is applied to the coil section of the relay section is set shorter than a time during which the relay section is kept on when the relay section is turned on from off. Relay drive. 4. A voltage detecting section for detecting the magnitude of the output voltage of a commercial AC power supply or the magnitude of the output voltage of a power supply section, wherein an output of the voltage detecting section is inputted to a pulse section. The time for applying a voltage to the coil of the relay unit or the time for not applying the voltage to the coil of the relay unit is changed according to the magnitude of the output voltage of the commercial AC power supply or the magnitude of the output voltage of the power supply unit. Relay drive. And a temperature detecting section for detecting a temperature of the relay section, wherein an output of the temperature detecting section is inputted to a pulse section, and a voltage is applied to a coil section of the relay section according to the temperature of the relay section. 2. The relay driving device according to claim 1, wherein the application time or the application non-application time is changed. 6. A current detection unit for detecting a current flowing in a coil unit of a relay unit, wherein an output of the current detection unit is input to a pulse unit. 2. The relay driving device according to claim 1, wherein a time for applying a voltage to the coil portion of the relay portion or a time for not applying the voltage is changed. 7. A relay unit having a resistance detecting unit for detecting a resistance value of a coil unit of the relay unit, wherein an output of the resistance detecting unit is inputted to a pulse unit.
2. The relay driving device according to claim 1, wherein a time for applying a voltage to the coil portion of the relay portion or a time for not applying the voltage is changed. And a coil voltage detecting section for detecting a voltage between the coil sections of the relay section, wherein an output of the coil voltage detecting section is inputted to a pulse section, and a magnitude of the voltage between the coil sections is provided. 2. The relay driving device according to claim 1, wherein a time for applying a voltage to the coil portion of the relay portion or a time for not applying the voltage is changed. 9. A state detection unit for detecting a use state of a device such as an iron, wherein an output of the state detection unit is input to a pulse unit, and a coil unit of a relay unit is output by an output of the state detection unit. 2. The relay driving device according to claim 1, wherein a time during which a voltage is applied or a time during which no voltage is applied is changed. 10. An impact detection unit for detecting an impact of a device such as an iron, wherein an output of the impact detection unit is inputted to a pulse unit, and an output of the impact detection unit is applied to a coil unit of a relay unit. 2. The relay driving device according to claim 1, wherein a time for applying a voltage or a time for not applying a voltage is changed.