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General Power Supply for Lamp Heater Halogen Lamp

Documents: Lamp heater power supply, and controller

Click here for information on the dedicated controller

Following is a description of the general power supply that can be used as the halogen heater.

In case of normal use, this power supply can be used. However, when high reliability and functionality is required in cases such as industrial applications, dedicated controller from Fintech must be used. Halogen lamp heaters can be used safely and easily. Dedicated controller

In the case of line condensation type (such as LWH type Line Heater), 100 V or 200 V power supply line voltage can be used as the rated voltage of the halogen lamp. In the case of line condensing type, the light emitter is generally a long and thin luminous body (filament), and a relatively high voltage can be adopted.

However, in the case of point condensing type (HSH Type), use 24 V or 12 V for low power type (300 w or less). In the case of point condensing type, the filament must be put together as tiny, for that low voltage is more convenient. It is difficult to use 200 V even with high power, and has been set up to 100 V (for example: 100v-22kw lamp for HSH-160).

In heaters using halogen lamps, the power can be easily controlled in the range of 0 to 100% by controlling the voltage. Therefore, generally a slightly larger power lamp is used and voltage is controlled to achieve the optimum heating temperature.

Therefore, the type that can change the voltage of the power supply to the halogen lamp heater is preferred.

The table below summarizes the power supply used for halogen lamps. In general, there is a slight difference between the power line voltage lamp and the low voltage lamp (12 V - 24 V).

Transformer (for 50/60 Hz) Normal transformer with copper wire wound around an iron core. It has a drawback that it is heavy, but there are also many advantages. To adjust the voltage with a transformer, a transformer with multiple taps can be used. For example, if you have a tap like 12-15-18-21-24 V for a 24 V lamp voltage can be adjusted approximately. In the case of a transformer, when the voltage of the power supply fluctuates, the output voltage also fluctuates. Since there is no slow start function, when the halogen lamp lit, inrush current tends to be a problem. It has an adverse effect on the power supply and adversely affects the lamp life. Inrush current can be reduced by using Hi-Lo instead of ON-OFF (Concept of preheating with a Lo voltage. Although the response is fast, (middle) from the point of view of energy saving).
High frequency transformer system
(mainly for low voltage lamp)
Generally power supply is obtained by driving a high-frequency transformer using a switching transistor, converting to a low voltage, followed by rectification to obtain the direct current, but halogen lamps can be turned on even at several tens of kHz, these lamps can be lit retaining the high frequency without rectification. There are lot of simple configuration by just combining self-oscillation circuit and a high frequency transformer. Extremely light weight compared to ordinary transformers. It is widely used for low-voltage halogen lamp instruments but it is difficult to obtain in small quantities. The output voltage is generally fixed, and even with the variable type the variable range is limited. This is almost generally used in lighting fixtures, and there are almost no general commercial products of this type.
Regulated DC power supply
(mainly for low voltage lamp)
This generates a low voltage direct current by driving a high-frequency transformer with a normal power transformer or high-speed switching and has the function of controlling the voltage fluctuation. Devices with output voltage adjustment are easy to use. Generally used transformers are heavy.

Although high-frequency transformer used is light in weight, but output voltage ranges becomes narrow in many cases (only a range of 5 - 15 V can be obtained with a specification 0 - 15 V) Type of protection circuit is also important. Those with protection circuit having “Characteristics shaped like Japanese Fu character” cannot be used for lamps. Those with “Voltage drooping characteristics" can be used without any problem. This is preferable even for the lamp because the inrush current is suppressed.

It is an ideal power supply for lighting low voltage halogen lamps, but it is somewhat expensive.
Various devices are introduced in the following table.
Slidac (Product name) or bolt slider

(for line voltage lamp)
Transformer whose output voltage can be varied in the range of 0 to 130% of the input voltage. Only this is okay to adjust the voltage of a lamp of line voltage (100 V or 200 V), but adjusting the voltage of the low voltage lamp and turning it on with this is risky.

Because it comes under a single turn transformer, the input and output sides are not insulated. Durable and easy to handle, but quite heavy.

The slow start of voltage is manual and the voltage rises slowly from zero to the predetermined voltage. In other words, it is for manual adjustment and is difficult to be used for automatic control.
Slidac + transformer

(mainly for low voltage lamp)
Combination of the above mentioned S Slidac with a transformer. Can also support low voltage lamps. Biggest drawback is that it is heavy, but durable and easy to handle. Automatic control is difficult.

Since the voltage exceeds the input voltage, as shown in the configuration on the right diagram, a voltage of approximately 31 V will be output from a transformer having an output of 24 V. In this case, care should be taken to prevent overheating when used for a long time with a voltage of 24 V or higher.
SCR slider SCR type power regulator

(for line voltage lamp)
SCR (semiconductor) version of bolt slider. It can be used in the same way as a bolt slider, but it is weak and can break easily even when excessive current is supplied momentarily. If a voltage is suddenly applied when a halogen lamp is connected, an inrush current which is 5 times or more than the rating flows at the instant when the lamp is lit and this may damage the lamp. To suppress inrush current, it is preferable to select a model with a slow start function. Also, use a FUSE.

Inrush current can be controlled by providing a slow start function. There are many models that have easy external control and are suitable for automatic control.

Power is controlled by high-speed switching, called phase control. Therefore voltage waveform distortion is large, and noise is likely to occur. Also, depending on the measuring instrument, measurement error increases. (Instrument that can measure true RMS value is necessary)
SCR slider + transformer

(mainly for low voltage lamp)
Configuration when the above mentioned SCR slide is used for the low-voltage lamps. Both SCR slider as well as step-down transformers are preferred products that have been built to achieve desired control. If control is not possible then noise is generated from the transformer or SCR operations become unstable.

SCR slider can only output voltages that are slightly lower than the input voltage (about 98%). Therefore even if a transformer of 24 V output is used as shown in the right figure, the range will be limited to 0 - 23 V.


Stabilized power supply for low-voltage halogen lamps

The halogen lamp has a large inrush current and may not work with the normal power supply. The following is the power supply that has confirmed by Fintech as supporting halogen lamps. The following general power supply can support normal usage. However, when high reliability and functionality is required in cases such as industrial applications, a dedicated power supply from Fintech must be used.
General power supply
10 to 30 V, 30 A Complex analog meter Displays voltage, current, and power 119700 yen Size: 225 × 130 × 420 Mass: 11.02 lbs (5 kg) 11.02 lbs (5 kg)
General power supply

3 V to 15 V 30 A
Displays voltage, and current digitally (Display is switchable)
37,000 yen.
Size: 8.26 x 3.14 x 10.43 in (210 X 80 X 265)
Mass: 6.39 lbs (2.9 kg)

General power supply
5 V to 15 V 30 A Analog 2 instrument Displays voltage, and current 34,400 yen.
Size: 5.7 x 4.72 x 10.62 in (145 X 120 X 270)
Mass: 6.39 lbs (2 kg)
» To dedicated power supply page


AC lighting and DC lighting

Halogen lamps can be lit up by AC or DC. However, in general lighting with alternating current is safer. The problem of DC lighting is the behavior when the lamp breaks. The flow of direct current is difficult to stop and the arc discharge may persist in the lamp even after burn-out. This heat softens the glass tube that bends and bulges, or bursts in the worst case.

Therefore, always light the lamp of line voltage (100 V or 200 V) using AC. There are almost no problems with low-voltage halogen lamps and either AC or DC can be used.

Problems while using a halogen lamp at a much lower voltage than the rated voltage

When the halogen lamp is lit at a voltage significantly lower voltage than its rated voltage, we tend to think that “The halogen cycle does not work because the temperature of the glass tube does not rise, and problems are likely to occur”, but lowering the voltage reduces the filament temperature, so evaporation of the filament is almost eliminated and the halogen cycle is not required. In other words, there is no problem even when the lamp is lit with a low voltage.

Regarding the phase control element

Triac or SCR (2 inverse parallel connections) is used as the phase control element for AC, but based on our experience, Triac tends to be susceptible to noise, and controller using SCR is recommended.

Information on Slidac

The name Slidac is a trademark of Toshiba Corporation, but it is currently not manufactured by Toshiba. However, this name is almost like a common name and we have used the name in this description. Incidentally, bolt slider is a trademark of YAMABISHI.



Made-to-order control panels

In case of just lighting the lamp heater, you can select and use the appropriate one from the various power supply in the table above, but when incorporating our heater into automatic machines, operation link with the automatic machine, safety devices and other measures are required, and a dedicated control panel that work accurately with that machine is absolutely necessary.

For such cases, Fintech selects the power supply with the configuration most suitable for our heater, we manufacture the control panel embedded with the control circuit on a made-to-order basis.

The following is a broad time schedule from the beginning of business negotiation to design, manufacture, and delivery

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 days
(1) Confirmation and examination of specifications
(2) Rough estimation
(3) Provisional order
(4) Detailed design Approval
(5) Final quote
(6) Formal order
(7) Production
(8) Inspection, and delivery

The configuration of the standard control panel is as follows. The configuration of the control panel is decided based on this by adding necessary additional functions and deleting unnecessary functions. The cost of control panel is determined by these requirements, capacity of hot air heater, and air flow rate. The quote will change depending on the distance if installation and inspection is required at the location of the customer.

Items Contents Remarks
Control Overview Voltage can be set in 2 steps, the duration to apply the voltage can be individually set with a timer. The cooling water and cooling air are monitored and the power supply to the device is stopped under abnormal circumstances. External control is possible
Control unit Basically it is a relay sequence. However, if the number of control relays increase, a sequencer (Mitsubishi) is used.
Safety device Earth leakage breaker, FUSE, flow switch for cooling water, flow switch for cooling air, emergency stop switch, and others.
Driving operation switch, and knob Main power supply Sw, Setting voltage (1) Sw, Setting voltage (2) Sw, Timer (1) , Timer (2), Stop, Timer OFF, and External control Sw
Running status display Power supply, operation, voltmeter, ammeter (analog instruments)
Error display Water quantity, air quantity, and others