KR100223345B1 - Controlling device for a heating device - Google Patents

Abstract

A control device for a heating device, which eliminates the need to use an IC or a microcomputer to carry out intermittent energization to a load, and connects to a power supply to improve accuracy by using one condenser to perform intermittent energization to a load. A control apparatus for a heating apparatus having a mounted load and a switch portion for intermittently supplying current to the load by being provided between the power supply and the load and inverting the load, wherein the inverting portion controls the inversion of the switch portion and maintains the inverted state for a predetermined time A holding portion, a potential setting portion connected to the inversion holding portion and setting a potential for operating the inverting holding portion, and a charging portion for charging current from the power supply and discharging the inversion holding portion, wherein the potential of the charging portion exceeds the voltage of the potential setting portion; The inverting holding part is operated to invert the switch part and the voltage of the The lowering stops the operation of the inversion holding unit so that the switch unit is inverted.

In this way, since several capacitors which are responsible for energizing / disconnecting the load are not required, the accuracy can be improved further than the conventional one, and the thermal power adjustment of the heating device can be easily achieved.

Description

Control of heating device

The present invention relates to a control circuit of a heating apparatus, and more particularly, to a control circuit suitable for controlling the thermal power of a cooker such as an electric kettle or a microwave oven.

Background Art Conventionally, as a means for controlling thermal power in heating cookers heated by resistance heaters, microwaves, electromagnetic induction, or the like, intermittent energization is carried out at regular intervals, for example, and the average thermal power to the heated object is known to be attenuated. . For example, a multivibrator circuit is known in which the average resistance is reduced to 50% by continuously energizing the load resistance for heating for 20 seconds, then stopping the energization for 20 seconds and repeating this operation.

Fig. 14 is a general multivibrator circuit ("Electronic Communication Handbook", Electronics and Telecommunications Society, etc.). The interruption period for energizing the load includes two capacitors C1, C2, two resistors R1, R2, two transistors Q1, I need Q2. The time constant for the intermittent period is governed by C1 × R1 and C1 × R2. In addition, it is known to use a voltage comparator IC and a CR time constant, a timer IC and a CR time constant, and a microcomputer to determine the interruption cycle of energization to a load.

In most of these conventional devices, ICs and microcomputers are used. However, these devices are expensive, and obtaining them abroad can be difficult due to legal regulations and the like. Intermittent energization control of is required to be realized. In addition, although two capacitors are necessarily required in the circuit of FIG. 14, the capacitors are generally expensive and easily cause individual differences of about 20% in their performance. Therefore, it is necessary to reduce the use of capacitors to improve accuracy. have.

The object of the present invention is to reduce the above problems, eliminating the need to use an IC or a microcomputer to carry out intermittent energization to a load, and to improve accuracy by using one capacitor to perform intermittent energization to a load. It is to provide a control circuit of a heating apparatus that can be made.

1 is a block diagram according to Embodiment 1 of the present invention;

2 is a circuit diagram according to Embodiment 1 of the present invention;

3 is a timing diagram according to Embodiment 1 of the present invention;

4 is a circuit diagram according to Embodiment 2 of the present invention;

5 is a timing diagram according to Embodiment 2 of the present invention.

6 is a circuit diagram according to Embodiment 3 of the present invention;

7 is a front view of a microwave oven according to Embodiment 3 of the present invention;

8 is a timing diagram according to Embodiment 3 of the present invention;

9 is a circuit diagram according to Embodiment 4 of the present invention;

10 is a timing diagram according to Embodiment 4 of the present invention.

11 is a circuit diagram according to Embodiment 5 of the present invention;

12 is a circuit diagram according to Embodiment 6 of the present invention;

13 is a front view of a microwave oven according to Embodiment 6 of the present invention;

14 is a circuit diagram showing a conventional control circuit.

Explanation of symbols on the main parts of the drawings

1: commercial power 2: load

3: switch part 4: relay coil

4a: relay contact 5: relay driver

6: first power circuit 7: second power circuit

8: charging part 9: potential setting part

10: inversion holding circuit 11: contact

13: charging stop

For this reason, in the invention according to claim 1, in the control apparatus of a heating apparatus having a load connected to a power supply and a switch portion provided between the power supply and the load and intermittently supplying current to the load, the switch unit is inverted. A reversal holding unit for controlling the voltage and maintaining the state inverted for a predetermined time, a potential setting unit connected to the inverting holding unit and setting a potential at which the inverting holding unit operates, and a charging unit for charging current from the power supply and discharging it to the inverting holding unit. When the potential of the charging portion exceeds the voltage of the potential setting portion, the reverse holding portion is operated to invert the switch portion, and the operation of the inverting holding portion is stopped by lowering the voltage of the charging portion to a predetermined value. And inverting the switch.

According to the second aspect of the present invention, there is provided a charge blocking portion for preventing current from flowing from the power supply to the charging portion when the charging portion is discharged, and releasing the blocking by inversion of the switch portion.

In the invention according to claim 3, the charging unit is provided with a variable resistor that is responsible for charging and discharging the charging unit.

The invention according to claim 4 is characterized in that a variable resistor is provided in the potential setting section, and the actuation / non-energization time to the load can be changed by varying the operation start voltage of the inversion holding section.

The invention according to claim 5 is characterized in that a switch portion is provided for maintaining / releasing the energized state or the non-energized state of the switch portion.

In the invention according to claim 6, the switch is connected to a timer for setting the heating time, and the timer operates to output the end of the heating time to control the switch section.

Embodiment of the Invention

Embodiment 1

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment is described with reference to drawings, the structure shown by the same code | symbol shows the same or equivalent structure.

1 is a block diagram of an electronic circuit showing this embodiment, FIG. 2 is a circuit diagram thereof, and FIG. 3 is a timing diagram thereof. In the drawing, reference numeral 1 denotes a commercial power supply (alternating current), in which a general load 2 serving as a heat source for heating is connected. (3) is a switch part 3 provided between the commercial power supply 1 and the load 2, and intermittently supplying electric current to the load 2 by repeating inversion. The switch unit 3 includes a relay driver 5 for driving the relay coil 4 and a relay contact 4a for intermittently supplying current to the load 2, and is connected to the commercial power source 1. It is connected to the power supply circuit 6. The first power supply circuit 6 is composed of a diode D2 for supplying half-wave current, a resistor Rb for suppressing the current, and a capacitor Cy for smoothing half-wave pulsation. For example, a voltage of about 24 V is supplied to the relay coil 4. Supply.

(7) is a second power supply circuit provided separately from the first power supply circuit, comprising a diode D1 receiving the commercial power supply 1 and supplying half-wave current, a resistor Ra for suppressing the current, and a capacitor C0 for smoothing the half-wave pulse. For example, a DC current of about 15V is supplied. Reference numeral 8 denotes a charging section connected to the second power supply circuit 7 for charging and discharging current and consisting of resistors Rc, Rd and a capacitor C1. (9) is a potential setting section which is connected to the second power supply circuit 7 and consists of resistors R1 and R2 having the same resistance values and sets the potential at which the inversion holding section 10 described later operates. Between the resistors R1 and R2 of the potential setting section 9, a contact 11 that takes a partial pressure of the resistors R1 and R2 is provided.

The inversion holding unit 10 is composed of transistors Q2 and Q3 in this example, and inverts the relay driver 5 by its inverting output and maintains the state for a predetermined time. The PNP transistor Q2 connects its base to the contact 11, the emitter is connected to the second power supply circuit 7 via a resistor Rd, and the collector is connected to the base of the NPN transistor Q3. The collector of transistor Q3 is connected between the base of transistor Q2 and contact 11. The relay driver 5 is composed of an NPN transistor Q4 and a resistor R5 connected to the base thereof. The resistor R5 is further connected to the contact 11 and the collector of the transistor Q4 is connected to the relay coil 4.

The operation of the control device of the heating apparatus having the above configuration will be described with reference to FIGS. 2 and 3. The transistor Q4 which drives the relay coil 4 when the commercial power source 1 is powered on is conducted through the resistors R1 and R5, and the relay contact 4a is closed to energize the load 2. On the other hand, in the residual power supply circuit 7, a voltage of, for example, about 15 V is supplied to the charging section 8, and the capacitor C1 starts charging via the resistor Rc. At this time, the transistor Q2 does not conduct because the divided voltage values of the resistors R1 and R2, which are the base potentials, are higher than the emitter potential.

When the capacitor C1 of the charging section 8 is sufficiently charged and the emitter voltage of the transistor Q2 becomes higher than the divided voltage value V _R2 of the resistors R1 and R2, the capacitor C1 discharges, and the bias current is applied to the emitter-base of the transistor Q2 via the resistor Rd. And the transistor Q2 conducts. At this time, since the collector of transistor Q2 is connected to the base of transistor Q3, transistor Q3 also conducts immediately. However, when the transistor Q3 conducts, the collector-emitter and the resistor R2 portion of the transistor Q3 are short-circuited, so that the current flowing through the resistors R1-R5 in the second power supply circuit 7 is blocked at the contact 11, so that the transistor eventually becomes a transistor. The load 2 becomes non-conductive by turning off Q4 and inverting the relay coil 4.

At the same time, since the base of transistor Q2 is connected to the collector of transistor Q3, the conduction of transistor Q2 is maintained and thus the conduction of transistor Q3 itself is also maintained. And, as a result, the resistor R2 to the collector of the transistor Q3 is conductive so paragraph V _R2 is for example a 0.4V level (saturation voltage during the conduction of transistor Q3).

Thereafter, the charge of the capacitor C1 is discharged through the path of the resistor Rd-transistor Q2-transistor Q3, but when the voltage of the capacitor C1 falls to a certain value, that is, below the conduction holding current of the transistor Q2, the conduction of the transistor Q2 is prevented. Therefore, the conduction of the transistor Q3 is also prevented, and the conduction of the resistor R1-resistance R5-transistor Q4 is restored and returns to the original state. For this reason, the relay coil 4 closes the relay contact 4a and energizes the load 2.

Thereafter, this is repeated, and the interruption energization is performed to the load 2 at predetermined cycles. In addition, if the resistance values of the resistors Rc and Rd are the same, the charge is continued even during discharge, so that the discharge time of the capacitor C1 becomes longer than that of the case of Rc Rd. It is longer than the energizing time. Thus, for example, if the resistor Rc is set to 50 kV, the capacitor C1 is set to 220 kV, and the resistor Rd is set to about 10 kV, a current flows in the load 2 for about 20 seconds and the relay contact 4a opens for about 20 seconds. It is possible to realize an energization pattern that does not become conductive.

According to this embodiment, the intermittent switching of the switch unit 3 which performs the intermittent energization of the load 2 is performed when the potential of the charging unit 8 becomes higher than the voltage of the potential setting unit 9 and the potential of the charging unit 8. Since it is executed when the temperature falls to a certain value, it can be realized by one capacitor without requiring a capacitor or the like that is responsible for each of the energization / interruption to the load 2. Therefore, the control apparatus of the heating apparatus which does not use expensive IC, a microcomputer, etc. can be provided. In addition, in general, capacitors are relatively expensive and have large individual differences in performance, so that the accuracy can be further improved than using a plurality of capacitors that are responsible for energizing / disconnecting the load 2. In addition, by appropriately setting the resistance values of the resistors Rc and Rd, it is easy to appropriately determine the energization / non-energization time to the load 2. It is also easy to reduce the number of parts for controlling the energization / disconnection to the load 2. In addition, instead of a relay, the switch part 3 may apply TRIAC etc. which are semiconductor switches.

Embodiment 2

In Embodiment 1, the resistor Rc is set to 50 mA and the resistor Rd is about 10 mA, but the energization time and the non-energization time to the load 2 are balanced. In this example, each of the resistors Rc and Rd has the same resistance value. The balance of the energization time and non-energization time to the load 2 is shown. To this end, in the present example, a charging stop unit for preventing charging of the charging unit 8 is provided.

FIG. 4 is a circuit diagram of this example, and FIG. 5 shows the timing diagram and is the same as that of FIG. In the figure, reference numeral 13 denotes a charge blocking portion composed of a PNP transistor Q1 and a resistor R6, and the emitter is connected to a contact 14 between the second power supply circuit 7 and the resistor R1 of the potential setting portion 9. The collector is connected to the resistor Rc of the charging section 8, the base is connected to the resistor R6, and the diode D4 is connected to the collector side of the transistor Q4. In addition, the resistors Rc and Rd have the same resistance value, for example, 50 kV and the capacitor C1 are 220 kV, respectively.

According to the above structure, since the transistor Q4 conducts via the resistors R1-R5 when the power is turned on, the switch section 3 is closed and the load 2 is energized, the transistor Q1 conducts, and the capacitor C1 conducts the transistor Q1. -Charging is started via the resistor Rc. When the potential of the charging section 8 becomes higher than the setting potential of the potential setting section 9, the transistor Q4 is made non-conductive eventually, so that the transistor Q1 is also non-conductive. When the capacitor C1 is discharged for about 20 seconds and the charge becomes less than or equal to the conduction holding current of the transistor Q2, the transistors Q2 and Q3 become non-conducting, and conduct the transistor Q4. For this reason, the transistor Q1 of the charge blocking unit 13 conducts and supplies current to the capacitor C1 through the resistor Rc again. At this time, since the resistor Rc and the resistor Rd have the same resistance value, the capacitor C1 discharges for about 20 seconds as in the discharged 20 seconds.

According to the present embodiment, since the charge blocking unit 13 is provided, charging can be prevented from being continued when the capacitor C1 is being discharged. Therefore, when the resistance values of the resistors Rc and Rd are the same, the charging time and the discharge time are reduced. It can be about the same time. Therefore, when the voltage of the charging section 8 becomes higher than the voltage of the potential setting section 9 and the potential of the charging section 8 decreases to a certain value, the intermittent switching of the switch section 3 which performs the intermittent energization of the load 2 is lowered. In the apparatus which was made to perform when it went, the energization time and non-energization time of the load 2 can be set to about the same time. In addition, the advantage of using the same resistor for the resistors Rc and Rd, for example, even if the assembly difference between the resistors Rc and Rd occurs during assembly, it is possible to operate without trouble or to obtain a light that facilitates the storage of the resistor before assembly. Can be.

Embodiment 3

This example is equipped with the regulator which can change the length of each period of the electricity supply / non-energization of the load 2 to the thing of Embodiment 2, and implements heating adjustment by this. In addition, since the structure other than the variable resistor VR is the same as FIG. 4, the description is abbreviate | omitted. 6 is a circuit diagram of the present example, FIG. 7 is a front view of the microwave oven having the circuit of FIG. 6, and FIG. 8 is a timing diagram. In FIG. 6, VR is a variable resistor which charges and discharges the capacitor | condenser C1 of the charging part 8, and is made to change a resistance value in synchronism with the slide of the thermal setting knob 18 mentioned later. The variable resistor VR replaces the resistors Rc and Rd of 50 mA, respectively, and therefore the total resistance of the variable resistor VR is 100 mA. In Fig. 7, reference numeral 16 denotes an operation panel having a thermal power scale 17 and a sliding thermal power setting knob 18, and 19 a timer knob.

In Fig. 8, a, b, and c represent the connection positions with the capacitor C1 of the variable resistor VR, respectively, where the discharge time is long with respect to the charging time at the position of a, and the charging time and discharge time are almost the same at the position of b. At the position c, the discharge time is shorter than the charge time. 8, the characteristic at the position of a is shown by the short dotted line, the characteristic at the position of b is shown by the solid line, and the characteristic at the position of c is shown by the long dotted line, respectively. In the lower side of FIG. 8, the energization state in the RY contact point on the upper side is shown for each position a, b, and c. However, the connection position of the variable resistor VR and the capacitor C1 is not limited to a, b, and c, but may be stepless depending on the type of the variable resistor VR, and may be multistep or stepless in practical use.

According to this embodiment, by adjusting the thermal setting knob 18, the connection position with the condenser C1 of the variable resistor VR to be interlocked is changed, and both the charging time and the discharging time of the charger 8 are changed. The energization time and non-energization time of (2) can be set to a desired level, so that the thermal power can be set to 20 to 100%. In addition, the ratio of charge / discharge of the charging section 8 by the variable resistor VR is constant even if the total resistance value of the variable resistor VR is nonuniform, and even if there is a variation due to individual differences in the capacity of the capacitor C1, the influence of the charge / discharge ratio is not affected. Therefore, the effect that the heating power adjustment of a heating apparatus can be performed stably is acquired.

Embodiment 4

In Embodiment 3, although the power supply / non-energization period of the load 2 is changed by changing the charging time and the discharging time of the charging section 8, the thermal power adjustment of the heating apparatus is performed. By setting the timing at which the setting unit 9 operates the inversion holding unit 10 to be variable, the heating power of the heating apparatus is adjusted. 9 is a circuit diagram thereof, and FIG. 10 is a timing diagram thereof. In Fig. 9, the configuration other than the variable resistor VR is the same as that in Fig. 1, and the description thereof is omitted.

It is inserted between the resistors R1 and R2 of the variable resistor VR as the potential setting section 9, and the center of the variable resistor VR is connected to the base side (contact point 11) of the transistor Q2. The base of the transistor Q4 is also connected to the base side of the transistor Q2 (contact 11) via a resistor R5. 10, d, e, and f represent the connection positions of the variable resistor VR and the contact 11, respectively, d is indicated by a short dotted line, e is indicated by a solid line, and f is indicated by a long dotted line. The position of d indicates a high-potential setting state in which the voltage for operating the inversion holding section 10 is high, the position of e is about medium, and the position of f is low. 10, the energization state of the RY contact of the upper side is shown by each position d, e, and f.

That is, since the set value of the variable resistor VR is high at the position d, the charging time of the capacitor C1 becomes shorter and the discharge time becomes longer. Since the set value of the variable resistor VR is about medium at the position e, the charging time of the capacitor C1 becomes longer and the discharge time becomes shorter. Since the set value of the variable resistor VR is low at the position f, the charging time of the capacitor C1 becomes longer, and the discharge time becomes shorter. The time constant of the charge and discharge of the capacitor C1 is constant, but if the time from the start of charge to inversion is controlled by the variable potential and the potential is sufficiently high (same as the second power supply circuit 7: the resistance R1 is compared with the value of the variable resistor VR). If the value is small enough, the reversal is not performed, and the transistor Q4 remains conductive so that the load 2 automatically energizes 100%.

According to this embodiment, since the variable resistor VR is provided in the potential setting section 9, the operating open voltage of the inversion holding section 10 is made variable, and the energization / non-energization time to the load 2 can be changed. The current carrying ratio to (2) can be appropriately set. In addition, since the potential of the charging section 8 does not exceed the voltage of the potential setting section 9, the potential of the potential setting section 9 (the variable resistor VR operates the inversion holding section 10 can be set somewhat higher). In addition, the thermal power adjustment which makes the energization rate of the load (2) 100% can also be implemented.

Embodiment 5

Although the present embodiment explained that in the fourth embodiment, the current carrying ratio of the load 2 could be 100% by using a variable resistor, the present example further explained that the current passing rate of the load 2 could be 0%. do. FIG. 11 is a circuit diagram thereof, in which switch SW1 for holding / releasing the energized state or non-energized state of the switch unit 3 is added to FIG. 9. That is, the switch SW1 reorganizes the contact 20 between the resistor R5 and the base side of the transistor Q2 (contact 11) and the contact 21 between the emitter of the transistor Q4 and the transistor Q3.

If the switch SW1 is opened continuously, the same energization control as in FIG. 9 is executed to enable 100% energization of the load 2, and the relay coil 4 is opened by closing the switch SW1 to conduct the contacts 20 and 21. With the base of the transistor Q4 to be driven at 0V potential, the operation of the transistor Q4 is prevented and the energization of the load 2 is inhibited to maintain the state. Therefore, by closing the switch SW1, it is possible to set the load 2 to a current carrying rate of 0%. For example, the cooking timer can be realized by connecting the switch SW1 to a timer (not shown) for setting a heating time provided in the microwave oven and closing the switch SW1 at the end of the heating time.

Embodiment 6

In Embodiment 5, although the electricity supply rate of the load 2 can be set to 0 to 100%, what was realized by another form is demonstrated in this example. 12 is a circuit diagram thereof, and FIG. 13 is a front view of the microwave oven to which the present apparatus is applied. 12 shows switches SW2 and SW3 added to the circuit diagram of FIG. 6. The switch SW2 maintains and releases the energized state of the switch unit 3, and adds the switch SW3. The switch SW2 represents the switch unit 3. The energized state is maintained and released, and the switch SW3 maintains / cancels the non-energized state of the switch unit 3.

The switch SW2 opens and closes the second power supply circuit 7 and the contact 22 of the resistor R1 and the contact 23 between the contact 22 and the resistor R5. The switch SW3 opens and closes the contact 20 between the contact 23 and the resistor R5 and the contact 21 between the emitter of the transistor Q4 and the transistor Q3. Therefore, when the switch SW2 is closed and in the conducting state, the transistor Q4 is continuously biased through the resistor R5 to maintain the energization state of the load 2 and makes the conduction rate of the load 2 100%. When the switch SW3 is closed and in the conducting state, the base of the transistor Q4 is constrained to a potential of 0 V and no conduction is obtained, so that the non-conducting state of the load 2 is maintained, and the conduction rate of the load 2 becomes 0%.

The switch SW2 is interlocked with the slide-type thermal power setting knob 18 of FIG. 13 and is closed when the thermal power setting knob 18 is set to 100% (maximum current), and the circuit is opened otherwise. In addition, the switch SW3 is interlocked with the timer knob 19, and when the timer knob 19 reaches the end of heating, the switch SW3 may be closed and set to an open state other than that.

According to this embodiment, since switches SW2 and 3 are provided to maintain / release the energized state or the non-energized state of the switch unit 3, the energization rate of the load is maintained at 0% with the switch unit 3 in the non-energized state. In addition, it is possible to maintain the energization rate of the load at 100% by making the switch part energized, which makes it possible to adjust the entire power range. In addition, the switch SW3 is connected to a timer for setting the heating time, and the timer operates by outputting the end of the heating time to control the switch unit 3, so that the current carrying ratio of the load is changed by the end signal of the heating time of the timer. It can be 0% and can be used as a cooking timer.

In the invention according to claim 1, the intermittent switching of the switch section for performing intermittent energization of the load is performed when the potential of the charging section becomes higher than the voltage of the potential setting section and when the potential of the charging section falls to a certain value. It is possible to realize a single capacitor without requiring a capacitor or the like for each of the blackouts. Therefore, the control apparatus of the heating apparatus which does not use expensive IC, a microcomputer, etc. can be provided. In addition, although the capacitor is relatively expensive and there is a large individual difference in performance, the present invention does not require a plurality of capacitors that are responsible for energizing / disconnecting the load, so that the accuracy can be further improved than the conventional one.

In the invention according to claim 2, since the charge blocking unit can prevent the charging from being continued when the capacitor C1 is discharged, the charging time and the discharge are made when the resistance values of the charging resistor and the discharge resistor are the same. There is an effect that the control can be made with almost the same time. Moreover, since the resistor of the same resistance value can be used, it is possible to operate without trouble even if there is a difference in assembly of the resistor during assembly, or to facilitate the storage of the resistor before assembly.

In the invention according to claim 3, since the variable resistor is provided in the charging section, the energization time and non-energization time of the load can be set at a desired level, and the heating power adjustment of the heating device can be easily realized.

In the invention of claim 4, since the variable resistor is provided in the potential setting section, the operating open voltage of the inversion holding section is made variable, and the energization / non-energization time to the load can be changed, so that the current carrying ratio to the load can be appropriately set. . In addition, since the potential of the potential setting section (variable resistor) to operate the inversion holding section can be set high so that the potential of the charging section does not exceed the voltage of the potential setting section, the thermal power adjustment with the current carrying ratio of the load at 100% can also be executed.

In the description of claim 5, since a switch is provided for maintaining or releasing the energized state or the non-energized state of the switch unit, the switch unit is set to the non-energized state to maintain the energization rate of the load at 0%, and the switch unit is set to the energized state. It is possible to maintain the power supply ratio of 100%, which makes it possible to adjust the whole range of fire power.

In the invention according to claim 6, the switch is connected to a timer for setting the heating time, and since the timer operates by outputting the end of the heating time to control the switch part, the current carrying ratio of the load is determined by the end signal of the heating time of the timer. It can be made 0%, and it has an effect that it can use as a cooking timer.

Claims (6)

A control apparatus of a heating apparatus having a load connected to a power supply and a switch portion provided between the power supply and the load and inverted to intermittently supply current to the load, wherein the inversion of the switch portion is controlled and inverted for a predetermined time. An inversion holding portion holding a portion, a potential setting portion connected to the inversion holding portion and setting a potential at which the inversion holding portion is operated, and a charging portion for charging current from the power supply and discharging the inversion holding portion; When the voltage exceeds the potential setting part, the inversion holding part is operated to invert the switch part, and the potential of the charging part is lowered to a predetermined value to stop the operation of the inverting holding part to invert the switch part. Control of the heating device. The control apparatus for a heating apparatus according to claim 1, further comprising a charge blocking unit for preventing a current from flowing from the power supply to the charging unit when the charging unit is discharged, and releasing the blocking by inverting the switch unit. The control apparatus for a heating apparatus according to claim 1, wherein the charging unit is provided with a variable resistor that is responsible for charging and discharging the charging unit. 2. The control apparatus of a heating apparatus according to claim 1, wherein a variable resistor is provided in the potential setting section, and the operation start voltage of the inversion holding section is variable so that the energization / non-energization time to the load can be changed. The control apparatus of the heating apparatus of Claim 1 provided with the switch which maintains / releases the energized state or the non-energized state of a switch part. 6. The control apparatus according to claim 5, wherein the switch is connected to a timer for setting the heating time, and the timer operates by outputting the end of the heating time to control the switch section.