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1. 发明公开

EP0208822A1 An electrostatic dust precipitator 失效
标题翻译：一种静电集尘器。
公开(公告)号：EP0208822A1
公开(公告)日：1987-01-21
申请号：EP85850238.8
申请日：1985-07-15
申请人： Kraftelektronik AB
发明人： Hansson, Curt
IPC分类号： B03C3/68
CPC分类号： B03C3/68
摘要： An electrostatic dust precipitator comprises a separation filter (5) having emitter and collector electrodes (4,6), means (1-3) for maintaining a substantially constant d.c. voltage between the electrodes (4,6) during operation of the precipitator, and pulse-generating means (1-3, 7-11) for generating at a given frequency in the order of 30-500 Hz voltage pulses or voltage pulse trains which are superimposed on the d.c. voltage and which are of short duration in relation to the aforesaid frequency. The pulsegenerating means (1-3, 7-11) includes capacitive and inductive elements (7,8) which together with the capacitance of the separation filter (5) form an electrical oscillation circuit, and a switching device (9) which is incorporated in said circuit and which is periodically actuatable by a control means (11) for activation of the oscillation circuit (5,7,8). The pulse-generating means (1-3, 7-11) further includes a known voltage-controlled frequency converter (1) which is arranged to generate an a.c. voltage having a frequency which is at least three times higher than the frequency of the voltage pulses or voltage pulse trains, and a singel-phase transformer (1) which is connected downstream of the frequency converter (1) and followed by a rectifier (3).

2. 发明授权

EP0208822B1 An electrostatic dust precipitator 失效
标题翻译：静电除尘器
公开(公告)号：EP0208822B1
公开(公告)日：1989-10-04
申请号：EP85850238.8
申请日：1985-07-15
申请人： Kraftelektronik AB
发明人： Hansson, Curt
IPC分类号： B03C3/68
CPC分类号： B03C3/68

3. 发明授权

EP0140851B1 Magnetization arrangement for transformers 失效
标题翻译：变压器的磁化装置
公开(公告)号：EP0140851B1
公开(公告)日：1987-11-11
申请号：EP84850264.7
申请日：1984-09-10
申请人： Kraftelektronik AB
发明人： Söderholm, Rolf
IPC分类号： H02M5/04 , G05F1/455
CPC分类号： H02M5/257 , H02P13/12

4. 发明公开

EP0140851A1 Magnetization arrangement for transformers 失效
标题翻译：变压器励磁装置。
公开(公告)号：EP0140851A1
公开(公告)日：1985-05-08
申请号：EP84850264.7
申请日：1984-09-10
申请人： Kraftelektronik AB
发明人： Söderholm, Rolf
IPC分类号： H02M5/04 , G05F1/455
CPC分类号： H02M5/257 , H02P13/12
摘要： In a transformer having a primary winding (11) which is connectable to an a.c. voltage source (13) via switch means (14) which opens and closes at a controllable frequency, there is connected in parallel with the primary or secondary winding (11, 12) of the transformer (10) a circuit (21) which for at least a part of the time during which the switch means (14) opens maintains magnetization of the transformer (10) in a direction opposite to the direction of the magnetization caused by the subsequent closing of the switch means (14).

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