摘要:
The invention relates to a high-pressure discharge lamp (1) provided with a discharge vessel (2) that is enclosed, with an interspace (3), by an outer bulb (4). The end of this outer bulb (4) is provided with a lamp cap (5). The lamp (1) has an ignition circuit (30) comprising a series connection of a glow starter (35)and an ohmic impedance (10). According to the invention, the ohmic impedance (10) is formed by a halogen incandescent lamp.
摘要:
A pulse booster circuit (10) comprises a first pulse transfer path (41) and a second pulse transfer path (42) extending between input terminals (1 la; l lb) and output terminals (12a; 12b). A series arrangement of a capacitor (20) and a first breakdown switch (13) is connected between said two input terminals (1 la; l l b). A series arrangement of a second breakdown switch (14) and a primary winding (31) of a transformer (30) is connected in parallel to said capacitor (20). A first output winding (32) of said transformer (30) is incorporated in said first pulse transfer path (41), while a second output winding (33) of said transformer (30) is incorporated in said second pulse transfer path (42).
摘要:
An ignition circuit for generating high voltage pulses to a discharge lamp is provided with a switching element (SW1) to enable to stop generating said high voltage pulses when the lamp does not ignite or has ignited. The switching element (SW1) is connected between the input terminals (ground, Vdc) of a supply voltage and a parallel circuit of a capacitor (C1) and a series connection of a breakdown device (B1) and a primary winding (W1) of a transformer (T1). Switching the switching element (SW1) non-conductive prevents that the capacitor (C1) from charging.
摘要:
A pulse booster circuit (10) comprises a first pulse transfer path (41) and a second pulse transfer path (42) extending between input terminals (1 la; l lb) and output terminals (12a; 12b). A series arrangement of a capacitor (20) and a first breakdown switch (13) is connected between said two input terminals (1 la; l l b). A series arrangement of a second breakdown switch (14) and a primary winding (31) of a transformer (30) is connected in parallel to said capacitor (20). A first output winding (32) of said transformer (30) is incorporated in said first pulse transfer path (41), while a second output winding (33) of said transformer (30) is incorporated in said second pulse transfer path (42).
摘要:
A method for driving a metal halide lamp (1) is described, the method comprising the step of generating a light controlling DC electric field E with a desired direction and a desired strength inside the lamp such as to obtain a desirable ion distribution inside the lamp. The lamp is supplied with a commutating current with a DC component, preferably having a constant current intensity and a duty cycle differing from 50%. By setting the duty cycle, it is possible to set a certain average value of the lamp current, allowing the efficacy and/or color temperature of the lamp to be influenced.
摘要:
Low-pressure mercury vapor discharge lamp has a discharge vessel (1) enclosing a discharge space (3) provided with an inert gas mixture and mercury. A first portion (11) of the discharge vessel is provided with a first electrode (12) and a luminescent layer (16), radiating light in a first range of the electromagnetic spectrum. A second portion (21) of the discharge vessel is provided with a second electrode (22), radiating light in a second range of the electromagnetic spectrum, said second range being different from the first range. According to the invention, the low-pressure mercury vapor discharge lamp comprises current supply conductors (12A, 12B; 22A, 22B) for receiving a DC current, and the discharge space contains only two electrodes (12, 22). The discharge lamp has a variable color temperature. Preferably, the discharge lamp influences the melatonin cycle in a human subject. Preferably, the lumen output level is independent of temperature.
摘要:
A gas discharge lamp (2) is operated with an alternating current. A positive lamp current (Ip) is generated with a positive current intisity (Ip) for a positive duration (τp). A negative lamp current (IN) is genrated with a negative current intensity (IN) for a negative duration (τN). A duty cycle (D=τp/(τp+τN)) differs from 50%. A current ratio (R=Ip/IN) differs from 1.
摘要:
A high-pressure discharge lamp (1) having a quartz glass discharge vessel (2) enclosing a discharge space (3) with an ionizable filling, wherein a first electrode (4) and a second electrode (40) are present between which a discharge is maintained during lamp operation, wherein a first seal (5) incorporates a first internal electric conductor (6) which connects the first electrode (4) to a first external electric conductor (7) extending from the seal (5) into the exterior, wherein said first seal (5) further incorporates a gas-filled cavity (10), wherein the internal electric conductor (6) is a foil which extends through the cavity (10), and wherein the foil (6) is provided with at least one hole (11).
摘要:
The invention relates to a high-pressure discharge lamp (1) provided with a discharge vessel (2) made of quartz glass which encloses a discharge space (3) having an ionizable filling and an electrode (4). The discharge vessel (2) is provided with a seal (5) which preferably encloses an Mo foil and forms a feedthrough for an electric conductor (6) to the electrode (4). At the location of the foil, the seal (5) has a gastight sealed cavity (10). According to the invention the cavity (10) is free of a capacitive coupling. This improves reliable ignition.
摘要:
A method of igniting a gas discharge lamp (2) comprises the steps of first applying a plurality of high- voltage ignition pulses with a relatively low amplitude and subsequently applying high- voltage ignition pulses with a relatively high amplitude. Switching over from generating low-amplitude ignition pulses to generating high-amplitude ignition pulses may be done on the basis of counting the low-amplitude ignition pulses or on the basis of monitoring the duration of the period during which the low-amplitude ignition pulses are generated.