JPS60250576A - Power source for driving heater - 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] [Technical Field of the Invention] The present invention relates to a heater drive power supply device, and more particularly, to a heater drive power supply device, and more particularly, a power supply device that supplies power matching the power used by the heater even when the magnitude of the voltage supplied to the heater changes. The present invention relates to a heater drive power supply device that can be controlled to

[Prior art and its problems When a coheater is used within its rated power,
Although it can be used for at least a predetermined lifespan, if it is used at a power higher than the rated power, the wire will easily break; the lifespan will be shortened. Therefore, when the heater is used within the rated power, for example, when the voltage supplied to the heater is within a predetermined range, it is preferable that the heater can be used for a predetermined lifespan or longer, even though the heater may easily break.

By the way, for example, if a device made for domestic use at 100 volts is exported to a foreign country, it can be converted to a different voltage, for example 20'O.
If you try to use it in a foreign country where volts are used up as commercial voltage, approximately 4f8 of power will be supplied to the heater, making the heater more likely to break and shorten its lifespan. The device in that state cannot be used in that foreign country.
For this reason, in the past, a separate heater was prepared for the foreign country, or a power transformer was equipped with a power transformer that was compatible with various voltages.
A tap was provided, and the appropriate voltage was supplied to the heater by switching the intermediate tap. However, in the method of preparing separate heaters, it is necessary to prepare various heaters for different countries with different voltages, which is undesirable from the viewpoint of inventory management, process control, etc.
Particularly, when a heater is incorporated into a device and shipped as a product, there is a problem in that inventory management and process management for both become even more complicated. In addition, in the method of installing a power transformer with intermediate taps corresponding to various voltages together with the heater, only one type of heater is required, but an extra power transformer is required, and the transformer has various intermediate taps. becomes large and uneconomical,
The problem is that it requires a large amount of space.

[Objective and Summary of the Invention] In view of the above-mentioned conventional circumstances, an object of the present invention is to provide a method that allows the power supplied to the heater to be within the rated power of the heater even if the power supply voltage supplied to the heater changes. Therefore, it is an object of the present invention to provide a heater drive power supply device which can make a heater or a device incorporating a heater similar to ljl, and can be made economical and relatively compact.

In order to achieve the above object, the heater drive power supply device of the present invention detects the zero voltage point of the AC input voltage, counts this zero voltage detection signal in a count selection circuit, and generates an output signal every predetermined count value. The switching means connected in series with the heater is actuated by this output signal, and the alternating current input voltage is supplied to the heater only during the subsequent half period of the alternating current input voltage.

[Embodiments of the invention] Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In the heater drive power supply device showing one embodiment of the present invention shown in FIG. It has become. Also, terminal 1
．． A zero voltage point detection circuit 9 is connected between 3 and 3.

This zero voltage point detection circuit 9 detects the zero voltage point of the AC input voltage, generates a zero voltage detection signal at the angular zero voltage point, and supplies this zero voltage detection signal to the g11 selection circuit 11 in the next stage. It looks like this. The count selection circuit 11 counts the zero voltage detection signal supplied from the y-port pressure point detection circuit 9, generates an output signal at a mark when this count value reaches a predetermined count value that has been selected and set in advance, and generates an output signal. A signal is supplied to the gate of the triac 5 through the transformer 13 to trigger the triac 5, and this output '
The C count result is reset by the signal. In particular, the predetermined periodic value is set in correspondence with the AC input voltage supplied between the terminals 1 and 3, and this selection setting can be made by various controls such as a rotary switch, a jumper wire, a numeric button, etc. The set value is compared with the result of counting zero voltage detection signals, and if the two match, the output signal is generated. That is, this output signal is supplied to the gate of the triac 5 via the transformer 1.3, and when the triac 5 is triggered, the triac 5 becomes conductive, thereby supplying the AC input voltage to the heater 7. The heater generates heat. The period during which the triac 5 is conducting is, by its nature, the period from when it is triggered and becomes conductive until the AC input voltage supplied to the triac 5 becomes out of phase; after this period, the next It remains in a state of interruption until the output signal is again supplied from the counting selection circuit 11.

Next, the operation of the heater drive N source device shown in FIG. 1 will be explained with reference to the waveforms shown in FIG. 2.

Now, as heater 7, it is a heater for 100 volts, that is, if the resistance of the heater is R, its rated power is 1002/R.
Using a heater, connect terminals 1, 3 . 100 between
A case where an alternating current voltage of volts is supplied will be explained. In this case, as described above, the count selection circuit 11 is set by a rotary switch, jumper wire, etc.
It is assumed that the predetermined 31 numerical values within are set to the value "1". Note that this setting is made when the device incorporating this heater and heater drive power supply device is shipped from the factory.
This can be done on-site or after arriving at the site where this equipment will be used.

In this way, the predetermined 31 numerical values in the count selection circuit 11 are "1".
In the heater drive power supply set to
When an AC voltage of 100 volts as shown in (a> in FIG. 2) is supplied during this period, the zero voltage point of this AC voltage is detected by the zero voltage point detection circuit 9, A zero voltage detection signal as shown in (b) of the M2 diagram is outputted from , and is supplied to the H1 number selection circuit 11.The counting selection circuit 11 converts this zero voltage detection signal into an H1 number, and this scale value is It is compared with the predetermined count value.As mentioned above, this predetermined cut value is currently set to "1", so every time the count value in the counting circuit 11 becomes "1", the division number is selected. An output signal is generated from the circuit 11 and is supplied to the triac 5 through the transformer 13, and this output signal resets the count value in the count selection circuit 11. makes it possible to count the zero voltage detection signal from the zero voltage point detection circuit 9 again from the beginning.As a result, the second
As shown in (b) of the figure, an output signal is generated at all single voltage points of the AC input voltage, and this is supplied to the gate of the triac 5 via the transformer 13 to make the triac 5 conductive. The heater 7 is supplied with the same AC voltage as the alternating voltage between the terminals 1 and 3 via the triac 5, and the heater 7 generates heat due to this supplied voltage. In this case, the power consumed by the heater 7 is 1002/R watts, which is the rated power of 1 node mentioned above.

Next, a case will be described in which a device using the heater 7 is used with an AC input voltage of 200 volts.

In this case, the AC voltage of 200 volts is directly applied to the heater 7.
When supplied to The corresponding value is “4”.
” value. As a result, the output signal from the count selection circuit 11 is generated every time four zero voltage detection signals are counted, as shown in (C) in FIG. , in Fig. 2 (
As shown in d), when calculated based on the number of half cycles of the AC input voltage, the AC voltage is supplied at a rate of 1 half cycle per 4 half cycles. Therefore, in this case, the power consumed by the heater 7 is 2002/(4R) Watts=1002/R, which is the rated power of the heater 7, as in the case where the AC input power is 100 volts. Therefore, even if the AC input voltage reaches 200 volts, excessive power is not applied to the heater 7, and the heater 7 can be used at its rated power.

[Effects of the Invention] As explained above, according to the present invention, the number of half cycles of the AC input voltage that is repeatedly supplied to the heater can be varied in accordance with the value of the AC input horn voltage. Even if the input voltage changes, constant power is always supplied to the heater, so even when exporting to a foreign country where the voltage is different from that in Japan, you can use a heater with a different rating or There is no need to manufacture and stock a device incorporating this heater, it is only necessary to manufacture and stock one type of heater or a device incorporating this heater, and the heater or device incorporating this heater is standardized. This makes inventory management and process management easier. Furthermore, since it can be configured using integrated circuits and small transformers, it can be made smaller and relatively inexpensive.

[Brief explanation of drawings]

11 is a circuit diagram of a heater drive power supply device showing one embodiment of the present invention, and FIG. 2 is a waveform diagram of each part of the heater drive power supply device of FIG. 1. 5...Triac 7...Heater 9...Zero voltage point detection circuit 11...Counting selection circuit 13...Transformer

Claims (1)

[Claims] A zero voltage point detection circuit detects the zero voltage point of an AC input voltage and generates a zero voltage detection signal, and the zero voltage detection signal from the zero voltage point detection circuit is counted, and an output signal is output every predetermined count value. switching that is connected in series to a count selection circuit and a heater, is actuated by an output signal of the count selection circuit, and supplies the AC input voltage to the heater only for a half period of the AC input voltage following this output signal; A heater drive power supply device having means.