DE29500462U1 - Light bulb clamp with thermistor - Google Patents

Description

Heinz Schulig 79650 Schopfheim

DESCRIPTION

Title: Light bulb saver clamp with thermistor

State of the art: There are many electronic devices for reducing high switch-on power losses in electrical consumers. Only thermistors, zero-voltage switches, phase control, ramp-up integrators, etc. are mentioned here.

Problem: When light bulbs are switched on, disproportionately high pulse losses occur due to the very low cold resistance of the filament, which reduces the lifespan of the light bulb and puts a strain on the technical lighting network. These can be eliminated by using the electronic circuits mentioned above; their disadvantages, in relation to solving the switching problems with light bulbs, are obvious:

- Complicated electronics, many components;

- Handling problems, especially for non-professionals;

- high price;

- Size and installation options.

Solution: Structure: Light bulb protection clamp according to protection claim

The bulb protector terminal consists of the brass screw terminals (1), (2) and (3). The thermistor (4), an NTC element, is pressed into the holes (5) of the screw terminals (1) and (2). The screw terminal (3) serves as

Heinz Schulig 79650 Schopfheim

Bridge terminal. The connecting wires are clamped using the screws (6). The elements are encapsulated in plastic using the injection molding process.

Electrical functional description:

Advantages:

The thermistor (4) is connected in series with the light bulb (consumer) via the light bulb protection terminal (Fig. 7). When no current flows through it, the thermistor has a high resistance. If the circuit is closed, a large part of the energy supplied is initially released in the thermistor and not in the filament. The NTC heats up very quickly and, due to the negative temperature coefficient, it becomes low-resistance. The flowing electrical energy is now largely released in the filament and no longer in the thermistor. The lamp burns at normal power.

1 High physical effect:

- Strong power pulse suppression in the filament during cold start and the associated extension of its service life;

- Current pulse suppression in the technical lighting network;

- Soft start is barely noticeable to the human eye (no cinema effect).

2 High technical safety

- Plastic overmoulding of fire class

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UL94-V0;

- high tracking resistance;

- high dielectric strength against overvoltage pulses.

Easy to handle:

- by clearly marking the connections P, N, Ll and L2. Here, P and N are the mains-side inputs of the terminals, Ll and L2 are used to connect the light bulb.

- Since there are no polarized or current-directing components in the terminal, mixing up inputs and outputs will not destroy the bulb saver terminal.

- The terminal is simply clamped between the mains and the consumer as a replacement for a normal lamp terminal.

Cost-effective manufacturing method:

- Simple overmolding of the components and therefore no complicated casting.

Good environmental compatibility:

- Few electronic components, only 1 NTC thermistor, practically no electronic waste, environmentally friendly halogen-free plastic.

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Heinz Schulig 79650 Schopfheim

Durable product:

- Virtually unlimited service life if treated properly.

As little interference as possible with the circuit, which could lead to the lamp not working properly if it is changed, e.g. if an energy-saving lamp is used.

Small dimensions

Wide range of applications:

- By using other thermistor values, the bulb saver terminal can be adapted to the power requirements of the consumers (bulbs) in the same design as the soft start terminal (SAKLE).

Design descriptions:

The bulb protector terminal can be installed in the lamp circuit either in principle or subsequently (invisibly in the ceiling cover).

Lamp manufacturers can use the terminal as a lamp component - connected to Ll/L2 - and market their lamps with an integrated bulb protector. The customer must then

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only need to connect the lamp to terminals P and N on the mains side.

Heinz Schulig

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LIST OF REFERENCE SYMBOLS

(1) Brass screw terminal

(2) Brass screw terminal

(3) Brass bridge screw terminal

(4) Thermistor, NTO element

(5) Holes in brass screw terminals (1) and (2)

(6) Screws for clamping the connecting wires

(7) Plastic overmolding

Fig. 1 Front of the bulb saver terminal

Fig. 2 Side view

Fig. 3 Top view

Fig. 4 Section through the P / Ll side of the clamp

Fig. 5 Section through the N / L2 side of the terminal

Fig. 6 Section through the front

Fig. 7 Functional diagram of the bulb saver terminal

Image scale 2:1

Claims (1)

Heinz Schulig 79650 Schopfheim Page PROTECTION CLAIMS Light bulb protection terminal with thermistor for installation in lamp circuits characterized in that 1.1 all live parts are protected against contact by plastic overmolding - no encapsulation; 1.2 the plastic overmoulding complies with fire class UL 94-VO; 2 the bulb protector clamp according to 1.1 and 1.2 consists of the following parts: - 2 brass screw terminals (1) (2) with holes (5) for pressing in the thermistor; - 1 brass bridge screw terminal (3), - 1 thermistor (4) NTC element, - 4 screws (6) for clamping the connecting wires, - Plastic overmoulding (7).