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公开(公告)号：US3782258A
公开(公告)日：1974-01-01
申请号：US3782258D
申请日：1971-12-03
Applicant: PHILIPS CORP
Inventor： BOEKKOOI A , LUURSEMA M , TOL T
CPC classification number: G03B15/0468
Abstract: The invention relates to an arrangement for igniting a discharge tube provided with an external ignition electrode. According to the invention this discharge tube is ignited with the aid of a mechanically operable piezo-electric element. The invention leads to a simple ignition circuit. In addition, the use of the invention in the field of flashing equipment in photocameras has the advantage that exchangeability is possible so that different kinds of flash lamps can be flashed on one and the same camera.
Abstract translation: 本发明涉及点燃具有外部点火电极的放电管的装置。
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公开(公告)号：US3818312A
公开(公告)日：1974-06-18
申请号：US28815072
申请日：1972-09-11
Applicant: PHILIPS CORP
Inventor： LUURSEMA M , PALMERS H , WIJSBOOM D
IPC: H02M3/338 , H02M7/5375 , H02M7/5383 , H05B41/24 , H02M1/02 , H02M7/52
CPC classification number: H02M7/53835 , H02M3/3384
Abstract: A DC-AC converter includes a transformer with its primary winding in series with a transistor across the terminals of a DC voltage source. A resistor is connected between the emitter and base of the transistor and a coupling capacitor connects a coupling winding of the transformer to the base of the transistor. An auxiliary DC voltage source is included in the connection between the emitter and the resistor so that the converter is less sensitive to variations in the DC source voltage.
Abstract translation: DC-AC转换器包括其初级绕组与直流电压源的端子上的晶体管串联的变压器。 电阻器连接在晶体管的发射极和基极之间，耦合电容将变压器的耦合绕组连接到晶体管的基极。 在发射极和电阻之间的连接中包括一个辅助直流电压源，使得转换器对直流电源电压的变化较不敏感。
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公开(公告)号：US3845350A
公开(公告)日：1974-10-29
申请号：US34792573
申请日：1973-04-04
Applicant: PHILIPS CORP
Inventor： LUURSEMA M , BOLHUIS P
CPC classification number: H05B41/3924 , G05F1/455 , H02M1/092 , H02M5/2573
Abstract: The invention relates to an arrangement for the controllable supply of a lamp which to this end is arranged in series with a controlled semiconductor switching element. According to the invention the control circuit of the semiconductor switching element is equipped with an optoelectronic coupling element. In case of a defect in the control circuit this element prevents the lamp supply voltage from causing damage in this control circuit. In addition the invention provides the possibility of extinguishing the lamp in a simple manner, substantially without a light flash.
Abstract translation: 本发明涉及一种用于可控供电的灯的装置，为此，其与受控半导体开关元件串联设置。
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公开(公告)号：US3798464A
公开(公告)日：1974-03-19
申请号：US3798464D
申请日：1972-09-11
Applicant: PHILIPS CORP
Inventor： LUURSEMA M
CPC classification number: H03K17/28 , G03B27/72 , Y10T307/951
Abstract: The invention relates to an electronic timer using a constant current discharge of a capacitor. This discharge is effected through the main electrodes of a transistor. According to the invention a linear potentiometer is incorporated in a circuit between the emitter and the base of the transistor, and the wiper of this potentiometer is connected to both the capacitor and to one of the input terminals of the device. In this embodiment it is achieved that the adjusting range of the switching time is relatively large, and that also the percentual accuracy is substantially the same throughout the adjusting range.
Abstract translation: 本发明涉及使用电容器的恒流放电的电子定时器。 该放电通过晶体管的主电极实现。
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