JPS6050338A - Heater control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a heater such as a fan heater.

Structure of conventional examples and their problems Conventional oil-burning heating appliances, such as oil fan heaters, have an oil tank 3 and a burner 4 inside an external device and a base 2, as shown in FIG. Combustion gas coming out from the top is removed by a blower motor 5 attached to the back of the exterior.
The warm air C is sent into the room from the front looper 7 along with the indoor air B by the blower fan 6 and the blower fan 6.

Furthermore, FIG. 2 shows an example of a conventional control circuit, in which an AC power supply 7 forms a closed circuit with a point A, a control circuit mainly including a microcomputer (hereinafter referred to as a microcomputer), a point S, a point B, and an operation switch 9. There is also a relay contact 10 and a heater 11 for preheating the burner between the points A and A. Relay contact 12-
A parallel circuit of the burner motor 13 and the blower motor 14, and a parallel circuit of the relay contact 16-electromagnetic bonder 16 and ignition g317 are connected, respectively.

FIG. 3 shows the connection between the microcomputer 18 in the control circuit 8 and the power supply circuit 19.

Recently, in such a circuit, a bear-shaped motor has started to be used for the burner motor 13 and the blower motor 14, and as a result, a very large voltage is generated due to the poor power factor of the motor with respect to the opening and closing of the relay contact 12. The situation is shown in the 4th part.
As shown in the figure, the height of this pulse (Vp is sometimes several thousand pol) K
The pulse noise enters the microcomputer 18 through the power supply circuit 19, often causing microcomputer malfunctions.Malfunctions in combustion appliances in particular are extremely dangerous and must be absolutely prevented. 18 power supply l'1JJC- (A ceramic capacitor 20 etc. is inserted at one point, but in reality, this alone is insufficient and malfunctions occur.Objective of the InventionThis invention was made in view of the problems mentioned in section 2. Structure of the Invention Aiming to Prevent Malfunctions In order to achieve the above object, the present invention provides noise absorbing elements at both ends of the motor, and a noise prevention capacitor is inserted between the contacts. No noise is generated at all.

DESCRIPTION OF EMBODIMENTS FIG. 5 shows an embodiment of the present invention, which differs from the conventional control circuit in that a voltage-dependent element (hereinafter referred to as a varistor) 21 is connected in parallel to the burner motor 13, and a voltage-dependent element (hereinafter referred to as a varistor) 21 is connected to the contact point 12. The characteristics of the varistor 21, which is obtained by attaching the Mylar film capacitor 22 in parallel, are as shown in FIG. 6, and is an element in which the current increases rapidly when a certain voltage is reached.

Therefore, the pulses generated when the relay contact 12 opens flow to the varistor 21 side, so the voltage decreases from several thousand volts to several hundred volts, as shown by Vp in Figure 4. However, these pulses have a large capacity, so This is it! Then, the microcomputer 18 malfunctions and the capacitor 22 is connected to both ends of the relay contact 12. As a result, the microcomputer 18 does not malfunction because the pulse is absorbed. Since this capacitor 22 is connected between the power supplies, it requires a relatively large capacitance with high reduction.For example, tl
-f mylar film contenza 1000V or more 1
Pressure control, with a capacitance of 0.01 μF to 0.1 μF, especially when large pulses are generated when a circle-shaped motor is used in parallel as shown in Figure 6, so the capacitance should be adjusted accordingly or +11 + 4/E It needs to be the same. Note that there are cases where a resistor is connected to the capacitor 22 in the m series, but the effect changes depending on the pulse size and the type of load motor.In addition, the ceramic capacitor 20 is connected between the power supply points G and d of the microcomputer 18. This is important, and without this, malfunctions may actually occur.Effects of the Invention As is clear from the description of the embodiments, according to the present invention, malfunctions of the microcomputer can be prevented by the function of the varistor and capacitor. Not only can stable control be achieved with a capacitor of this size, it also has the effect of reducing sparks between contacts, reducing wear, and extending life.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a Gukofan heater shown as a heater according to an embodiment of the present invention, Figs. 2 and 3 are Glock diagrams for explaining the control circuit, and Fig. 4 is a pulse characteristic showing an abnormal pulse. Figure 5 shows the system in one embodiment of the present invention. The block diagram of the IA1 circuit and FIG. 6 are characteristic diagrams of the varistor. 12...Contact, 13...Burner motor,
14...Blower motor, 18...Microcomputer,
21... Ballista, 22... Capacitor. Agent's name: PFJ! Shichu/W Toshio and 1 other person Figure 1 f Figure 2 Figure 3

Claims (1)

[Claims] It has a blower motor that supplies combustion air or hot air, and contacts that supply voltage to this motor. An abnormal voltage absorption element is connected in parallel to the motor, and a noise prevention capacitor is connected between the contacts. 1 is the control device for the TG.