JPH0473523A - Heating cooker - Google Patents

Abstract

PURPOSE:To lower the cost by providing the main circuit of a switching element for phase control with a connector capable of connection to a noise filter circuit unit. CONSTITUTION:The main circuits respectively of triacs 41, 42 for phase control, switching elements to perform phase control, are provided respectively with connectors 45a, 45b, 46a, 46b which are capable of connection to a noise filter circuit unit 49. When measures need to be taken against noises, a noise filter circuit unit 49 is connected to the connectors 45a, 45b, 46a, 46b and to the phase-control triacs 41, 42. The noise filter circuits 47, 48 work with no consideration of the current capacities of other loaded devices and appliances so that lowering in cost can be achieved. When there is no need for measures against noises, the noise filter circuit unit 49 can be dispensed with and a meaningless increase in cost can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a cooking device that includes a switching element and adjusts the output of a heater by phase control.

(Prior Art) For example, some electric ranges include a halogen lamp heater as a range heater and a sheathed heater as a roaster heater. In this device, the output of the halogen lamp heater is adjusted by phase control. This circuit configuration is shown in FIG. This electric range is equipped with two sets of halogen lamp heaters 1 and 2 and one sheathed heater 3, and each of the halogen lamp heaters 1 and 2 receives an alternating current voltage using a triac 4.5 as a switching element. The heating output is adjusted by controlling the phase. Note that the sheathed heater 3 is turned on and off by on/off control by the triac 6.

By the way, in a circuit that performs phase control, triac 4,
Noise is generated by the switching in step 5, and the noise may enter the power supply side and adversely affect other electrical devices such as televisions and radios. In this case, the noise may have an effect in areas where the electric field strength of radio waves is weak, such as in mountainous areas. As a countermeasure against this problem, as shown in the figure, a noise filter circuit 7 consisting of a coil L and a capacitor C is provided on the power supply line, so that the noise does not go outside. However, in this case, the current capacity of the noise filter circuit 7 must be set to a high current capacity, taking into account the current of the sheathed heater 3, a load device not related to phase control, and the rating of the coil and capacitor C. This increases the size, especially the thickness of the wire of the coil L, which increases the cost.

(Problems to be Solved by the Invention) As a countermeasure to this problem, we are considering providing a noise filter circuit in each main circuit of the switching element for performing phase control. In this way, the ratings of the coil and capacitor can be reduced, resulting in considerable cost reduction.

By the way, the above-mentioned noise generation can be audible in areas where the electric field strength is weak, and depending on other electrical equipment, the noise can be ignored, so it is extremely rare for an electric range to actually require a noise filter circuit. The reality is that it is a department. Taking this point into consideration, if a noise filter circuit is not required, providing the noise filter circuit will instead lead to a pointless increase in cost.

The present invention has been made in view of the above circumstances, and its purpose is to realize noise countermeasures without incurring any cost when noise countermeasures are necessary, and to avoid unnecessary increase in costs when noise countermeasures are unnecessary. There is no need to provide a heating cooker.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a device that includes a switching element and adjusts the output of a heater through phase control, in which a noise filter circuit unit is connected to the main circuit of the switching element. It is characterized by the provision of a connector that can

(Function) A connector to which a noise filter circuit unit can be connected is provided in the main circuit of the switching element for performing phase control, so if noise countermeasures are required, the noise filter circuit unit can be connected to the connector. In this case, the connector is provided in the main circuit of the switching element, so the circuit does not take into account the current capacity of other load devices, and unlike the case where a noise filter circuit is provided in the power supply line, the cost is reduced. It can be planned. Further, if noise countermeasures are not required, a noise filter circuit unit may be added, so that the cost does not increase unnecessarily.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Figure 3 shows an electric range. cabinet 11
is provided with a range section 12, a roaster section 13, a right operation panel 14, and a left operation panel 15. The range section 12 includes a first range heater 16, which is a halogen lamp heater that is self-adjusted. Same second
A range heater 17 is provided. Further, the roaster portion 13 is provided with a roaster heater 18 consisting of a sheathed heater. The right operation panel 14 is provided with a power switch 19, an "on" switch 20 for energizing the first microwave heater 16, an "off" switch 21 for turning off the power, and a switch 2 for increasing output.
2. An output down switch 23 and an output indicator 24 are provided.

Further, the right operation panel 14 is provided with an "on" switch 25 for energizing the roaster heater 18, an "off" switch 26 for cutting off the power, and an operation indicator 27. The left operation panel 15 also includes an "on" switch 28 for energizing the second range heater 17, an "off" switch 29 for cutting off the power, an output up switch 30, and an output down switch 31. and output indicator 32
is provided.

Next, FIG. 1 shows the electric circuit configuration. AC power supply 3
One terminal 33a of the AC power source 33 is connected to the power line La via the power switch 19, and the other terminal 33b of the AC power source 33 is connected to the power line Lb. A constant voltage circuit 34 and a zero cross circuit 35 are connected in parallel between both terminals 33a and 33b of the power source 33, and the output side of each of these circuits 34 and 35 is an operating system including a microcomputer. It is connected to the control circuit 36. Note that the constant voltage circuit 34 is connected to a reset circuit 37 that provides a reset signal to the microcomputer. Furthermore, the operation control circuit 36 is connected to the aforementioned switches 20 to 23.25 degrees and 26.28 to 31, as well as the indicators 24 and 27.32.

Furthermore, drive circuits 38, 39, and 40 for switching elements, which will be described later, are connected to this operation control circuit 36.

Now, between the power lines La and Lb, the first range heater 16 and the phase control triac 41, which is a switching element, are connected in series, and the second range heater 17 and a phase control triac 41, which is a switching element, are connected in series. A control triac 42 is connected in series, and a thermostat 43, the roaster heater 18, and a energization/disconnection triac 44 are further connected in series. The gate of each triac 4i, 42.44 is connected to a drive circuit 38.
39.40 is connected.

Here, the main circuit of the phase control triac 41 is provided with connectors 45a and 45b to which a noise filter circuit unit can be connected. A connector 45a is connected, and a connector 45b is connected to the power line Lb. Note that there is also a connector 45c on the output side of the drive circuit 38.
is connected. Thus, the T terminal of the phase control triac 41 is connected to the connector 45a, the T2 terminal of the phase control triac 41 is connected to the connector 45b, and the G terminal of the phase control triac 41 is connected to the connector 45c. There is.

Further, the main circuit of the phase control triac 42 is also provided with connectors 46a and 46b to which a noise filter circuit unit can be connected, as described above, and a connector 46c is connected to the output side of the drive circuit 39. has been done. A phase control triac 42 is separably connected to each of these connectors 46a, 46b, and 46c.

In addition, in FIG. 2, when necessary, each of the connectors 45a to
45c, 46a to 46c, and a noise filter circuit unit 49 configured by mounting noise filter circuits 47 and 48 on a board 49a.
9a is provided with unit-side connectors 50a, 50b, and 50c for the noise filter circuit 47, and unit-side connection terminals 51a, 51b, and 51c, respectively. The noise filter circuit 47 has a structure in which a coil 47a and a capacitor 47b are connected to connectors 50a, 50b and connection terminals 51a, 51b as shown in FIG. 50c and the connection terminal 5]C are short-circuited. Note that the noise filter circuit 48 is similar to the noise filter circuit 47 described above, that is, the board 49a has connectors 52a, 52b, 52c and connection terminals 53a, 53.
b and 53c, and these are connected to the coil 48a and capacitor 48b of the noise filter circuit 48 in the same way as in the case of the noise filter circuit 47.

The operation of the above configuration will be described. In FIG. 1 where the noise filter circuit unit 49 described above is not provided, for example, the "on" switch 20 of the first range heater 16 is operated, and then the output up switch 32 or the output down switch 23 is operated. Then, the operation control circuit 36 determines a phase control angle based on the output setting value, and outputs a control signal to the drive circuit 38 based on the zero-crossing detection signal given from the zero-crossing circuit 35 and this phase control angle.

Then, the drive circuit 38 outputs a gate trigger signal in response to this control signal to turn on the phase control triac 41 (off is a turn-off), thereby controlling the phase of the AC voltage. In this case, the output of the first microwave heater 6 changes depending on the magnitude of the control angle. The gate trigger signal is output in accordance with the zero-cross period of the AC power supply.

At the time of shipment of this electric range, there is a possibility that the field strength of radio waves in the area where this electric range is used is weak, and the noise generated by the above-mentioned phase control may adversely affect other electrical equipment (receivers such as radios and televisions). If the noise is expected to increase or the noise cannot be ignored, connect the connectors 45a to 45c, 46a to 4.
After removing the phase control triacs 41 and 42 from 6c, connect the unit side connection terminals 51a to 51c and 53a to 53C of the noise filter circuit unit 49 to the connectors 45a to 45c and 46a to 46c, and then connect the unit side connection terminals 51a to 51c and 53a to 53C to the connectors 45a to 45c and 46a to 46c, and ~5°c, 52a~52(,
are connected to each phase control triac 41 and 42.

Note that the circuit configuration in this case is as shown in FIG. 4, and since each noise filter circuit 47, 48 is provided in the main circuit of each phase control triac 41, 42, it can be used as a noise filter circuit 47, 48. Unlike the case where a noise filter circuit is provided on the power supply line, only a device with a small current capacity is required.

If one noise filter circuit unit is equipped with one noise filter circuit, when installing this noise filter circuit unit later, remember the number of switching elements used in the electric range. If this is not done, there is a risk that the number of additional noise filter circuit units may be too large or too small.
1.42 (in this case, 2) noise filter circuits 47 and 48 are provided on one board 49a, so the required number of noise filter circuit units for one electric oven is Since they always become one, there is no such fear.

According to this embodiment, the phase control triacs 41, 4, which are switching elements for performing phase control,
Noise filter circuit unit 4 is installed in each of the main circuits of 2 and 4.
9 connections possible connectors 45a, 45b, 46a, 4
6b is set up from the phone, and noise countermeasures are required if necessary.
Connect the noise filter circuit unit 49 to the connector 45a.
, 45b, 46a, 46b and phase control triac 4
1.42, in this case, connector 45
Since a, 45b, 46a, and 46b are provided in the main circuit of each phase control triac 41 and 42, the noise filter circuit 4748 can be a circuit that does not take into account the current capacity of other load devices, and eliminates noise from the power line. Unlike the case where a filter circuit is provided, costs can be reduced. Furthermore, if noise countermeasures are unnecessary, the noise filter circuit unit 49 need not be added, and therefore the cost will not increase unnecessarily.

In addition, in the above embodiment, the connectors 45a to 45c, 46
Although a to 46c can be connected to and separated from the phase control triac 4142 in addition to the noise filter circuit unit 49, the connectors only need to be connectable to at least the noise filter circuit unit; in this case, the phase control The triac for phase control may be configured to be fixed to a circuit board by soldering in advance, and a connector may be provided to the main circuits of the triacs for phase control 41 and 42. Further, the drive circuit 38.
39 and the gate terminal G of each triac 41, 42 may be soldered from the beginning. In this case, each connector 45c, 46c, unit side connection terminal 51c, 53
The c-unit side connectors 50c and 52c become unnecessary.

In addition, the present invention is not limited to the embodiments described in ``-1'', and can be implemented with various modifications within the scope of the invention.

[Effects of the Invention] As is clear from the above description, the present invention provides a device that includes a switching element and adjusts the output of a heater through phase control, in which a noise filter circuit unit is connected to the main circuit of the switching element. It is characterized by the provision of a connector that can be used as a noise countermeasure, which can be achieved at no cost if noise countermeasures are necessary, or meaningless if noise countermeasures are unnecessary. This has the excellent effect of not increasing costs.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, FIG. 1 is an overall electrical circuit diagram, and FIG. 2 is a perspective view showing the connector, phase control triac, and noise filter circuit unit separated. , FIG. 3 is a perspective view showing the overall structure, and FIG. 4 is an electrical circuit diagram of the main parts to which the noise filter circuit unit is connected. FIG. 5 is an overall electrical circuit diagram showing a conventional example. In the drawing, 16 is a first range heater (heater), 17 is a second range heater (heater), 41°42 is a phase control triac (switching element), 45a, 4
5b, 46a, and 46b are connectors, and 49 is a noise filter circuit unit. Agent Patent Attorney Tsuyoshi Sato

Claims (1)

[Claims] 1. A heating cooker comprising a switching element and adjusting the output of the heater by phase control, characterized in that the main circuit of the switching element is provided with a connector to which a noise filter circuit unit can be connected.