Control means with redundant oscillators and a special starting scheme for periodically firing electric valves
阅读：919发布：2022-03-15
专利汇可以提供Control means with redundant oscillators and a special starting scheme for periodically firing electric valves专利检索，专利查询，专利分析的服务。并且In an electric power delivery system, a plurality of controllable electric valves which are arranged in a bridge configuration are respectively fired in a predetermined sequence by a family of individual firing signals. At least three redundant frequency modulated oscillators and a distributor are used for cyclically generating the firing signals in timed relation to the alternating voltage of the power system. Each of the oscillators produces a train of discrete pulses at a frequency which normally is a predetermined harmonic of the system frequency, and the distributor includes voting logic means which enables a firing signal to be produced in the event of a coincidence of discrete pulses from any two of the oscillators. Concurrently with the commencement of each firing signal, all of the oscillators are simultaneously recycled. A special scheme is provided for starting the firing signal generator in step with system voltage so that the initial firing signal is associated with a predetermined one of the valves and is characterized by a known firing angle of desired value.，下面是Control means with redundant oscillators and a special starting scheme for periodically firing electric valves专利的具体信息内容。
1. In an electric power delivery system comprising a plurality of controllable electric valves connected in a bridge configuration between two sets of power conductors, at least one of said sets being associated with a polyphase alternating voltage network, improved control means for cyclically firing said valves in a predetermined sequence and at a frequency that can be varied relative to the frequency of said alternating voltage in order to vary the firing angle of the respective valve firings, comprising: a. a plurality of frequency modulated oscillators which are respectively operative to produce a plurality of trains of discrete pulses, each of said oscillators having an integrating characteristic and being supplied with a variable signal whose magnitude determines the time interval that the oscillator requires after being periodically recycled before producing its next discrete pulse, the pulse frequency of each of said trains being a predetermined harmonic of the fundamental frequency of said alternating voltage whenever said variable signal has a predetermined normal magnitude; b. a distributor responsive to said pulse trains for producIng during each cycle of alternating voltage a family of individual firing signals for the respective valves of said bridge, said distributor comprising (i) voting logic means connected to all of said oscillators for generating a single pulse of relatively short duration each time there is a conicidence of distrete pulses from any two of said oscillators and, concurrently with the generation of each short pulse, for issuing a feedback signal for simultaneously recycling all of said oscillators, and (ii) means driven by successive short pulses from said voting logic means for producing said family of individual firing signals in response to a predetermined schedule of said short pulses; and c. means activated by the individual firing signals of said family for firing said valves in sequence.
2. The improved control means of claim 1 in which there are at least three oscillators.
3. The improved control means of claim 1 in which there are six valves in said bridge, said predetermined harmonic is the 12th harmonic, and said predetermined schedule comprises alternate ones of the succession of short pulses.
4. In an electric power delivery system comprising 12 electric valves connected between two sets of power conductors at least one of which sets is associated with a polyphase alternating voltage network, half of said valves being arranged in a first six-pulse bridge configuration and the other half of said valves being arranged in a second six-pulse bridge configuration whose d-c terminals are connected in series with the d-c terminals of the first bridge and whose alternating voltage connections are phase-displaced 30 electrical degrees with respect to those of the first bridge, the improved control means set forth in claim 1 wherein said predetermined harmonic is the 12th harmonic, said distributor produces a first family of six individual firing signals for the respective valves of said first bridge and a second family of six individual firing signals for the respective valves of said second bridge, and wherein the means driven by successive short pulses is arranged to produce the respective firing signals of said first family upon being driven by a schedule of first, third, fifth, seventh, ninth, and 11th short pulses and to produce the respective firing signals of said second family upon being driven by a schedule of second, fourth, sixth, eighth, tenth, and 12th short pulses each cycle of alternating voltage.
5. The improved control means of claim 1 in which each of said oscillators comprises: a. an integrator responsive to said variable signal for developing an output signal whose magnitude increases with the time integral of said variable signal, b. reset means associated with said integrator and operative periodically in response to said feedback signal to reduce the magnitude of said output signal to substantially zero, thereby recycling the oscillator, and c. a level detector having an input connected to said integrator and an oupput at which a discrete pulse is produced each time the magnitude of the output signal of said integrator attains a predetermined level.
6. The improved control means of claim 1 further comprising a plurality of synchronizing means coupled to the respective oscillators and to said one set of conductors for effectively preventing operation of the oscillators in the absence of a start command, each of said synchronizing means being activated on receipt of said start command to allow the associated oscillator to start producing discrete pulses in response to the first occurrence after such activation of a predetermined reference point which recurs in each cycle of alternating voltage.
7. The improved control means of claim 6 in which said distributor includes means for locking said short-pulse driven means in a preset pattern in the absence of said start command so that following activation of said synchronizing means the first pulse generated by said voting logic means will caUse said driven means to produce an initial firing signal for a predetermined one of said valves.
8. In combination: a. a plurality of frequency modulated oscillators which are respectively operative to produce a plurality of trains of discrete pulses, each of said oscillators comprising (i) an integrator responsive to a variable signal for developing an output signal whose magnitude increases with the time integral of said variable signal, whereby the magnitude of the variable signal determines the rate of increase of said output signal, (ii) a level detector having an input connected to said integrator and an output at which a discrete pulse if produced each time the magnitude of the output signal of said integrator attains a predetermined level, and (iii) reset means associated with said integrator and responsive to a feedback signal for periodically reducing the magnitude of the integrator output signal to substantially zero, thereby recycling the oscillator, each of said trains having a pulse frequency of f Hertz which varies with the magnitude of said variable signal; and b. voting logic means connected to all of said oscillators for generating a single pulse of relatively short duration each time there is a coincidence of discrete pulses from any two of said oscillators and, concurrently with the generation of each short pulse, for issuing a feedback signal for simultaneously recycling all of said oscillators.
9. The combination of claim 8 further including means driven by successive short pulses from said voting logic means for cyclically producing a sequence of N individual signals each of which recurs at a frequency of f/N Hertz.
10. The combination of claim 9 in which there are four oscillators and N is equal to 12.
11. In an electric power delivery system comprising a plurality of periodically conducting controllable electric valves connected between two sets of power conductors, at least one of said sets being associated with a polyphase alternating voltage network, improved control means for cyclically firing said valves in a predetermined sequence and at a frequency that can be varied relative to the frequency of said alternating voltage in order to vary the firing angle of the respective valve firings, comprising: a. an oscillator operative to produce a train of discrete pulses whose frequency depends on the magnitude of a variable signal supplied thereto, said pulse frequency being a predetermined harmonic of the fundamental frequency of said alternating voltage whenever said variable signal has a predetermined normal magnitude; b. a distributor responsive to said pulse train for producing during each cycle of alternating voltage a family of individual signals for the respective valves of said system, each firing signal recurring at said fundamental frequency so long as the pulses in said train have said predetermined harmonic frequency; c. means activated by the individual firing signals of said family for firing said valves in sequence; and d. synchronizing means coupled to said one set of conductors and to said oscillator for effectively preventing operation of the oscillator in the absence of a start command, said synchronizing means being activated on receipt of said start command to allow said oscillator to start producing discrete pulses in response to the first occurrence after such activation of a predetermined reference point which recurs in each cycle of alternating voltage.
12. The improved control means of claim 11 in which said distributor includes means for locking itself in a preset pattern in the absence of said start command so that following activation of said synchronizing means the first discrete pulse produced by said oscillator will cause said distributor to produce an initial firing signal for a predetermined one of said valves.
13. The improved control means of claim 12 in which said initial firing signal is characterized by a predetermined firing anglE.
14. The improved control means of claim 13 in which said predetermined firing angle is approximately 90*.
15. The improved control means of claim 12 in which said predetermined reference point coincides with the negative-going zero crossing of the commutating voltage of the valve which when subsequently fired will relieve conduction in said predetermined one valve.
16. The improved control means of claim 15 wherein said oscillator produces said first discrete pulse on the expiration of a time delay corresponding to approximately one-twelfth of a cycle of alternating voltage following said first occurrence of said negative-going zero crossing.
17. The improved control means of claim 11 for an electric power delivery system comprising six valves interconnected in a six-pulse bridge configuration, wherein said predetermined harmonic is the 12th harmonic and said distributor includes means for locking itself in a preset pattern in the absence of said start command so that following activation of said synchronizing means the second discrete pulse produced by said oscillator will cause said distributor to produce an initial firing signal for a predetermined one of said valves.
18. The improved control means of claim 17 in which the first discrete pulse produced by said oscillator after activation of said synchronizing means coincides approximately with a negative-going zero crossing of the commutating voltage of the valve which when subsequently fired will relieve conduction in said predetermined one valve.
19. The improved control means of claim 11 further comprising means coupled to said one set of conductors for deriving an array of cyclic reference signals synchronized with the voltages of said polyphase network, the said predetermined reference point coinciding with the trailing edge of a predetermined one of said reference signals, and wherein additional means is provided for preventing operation of said oscillator in the absence of a valid array of said reference signals.
20. In an electric power delivery system comprising a plurality of periodically conducting controllable electric valves connected between two sets of power conductors, at least one of said sets being associated with a polyphase alternating voltage network, improved control means for cyclically firing said valves in a predetermined sequence and at a frequency that can be varied relative to the frequency of said alternating voltage in order to vary the firing angle of the respective valve firings, comprising: a. a frequency modulated oscillator operative to produce a train of discrete pulses, said oscillator comprising (i) an integrator responsive to a variable signal for developing an output signal whose magnitude increases with the time integral of said variable signal, whereby the magnitude of the variable signal determines the rate of increase of said output signal, (ii) a level detector having an input connected to said integrator and an output at which a discrete pulse is formed each time the magnitude of the output signal of said integrator attains a predetermined level, and (iii) reset means associated with said integrator and responsive to a feedback signal for periodically reducing the magnitude of the integrator output signal to substantially zero, thereby recycling the oscillator, the frequency of said discrete pulses being a predetermined harmonic of the fundamental frequency of said alternating voltage whenever said variable signal has a predetermined normal magnitude; b. a distributor responsive to said pulse train for producing during each cycle of alternating voltage a family of individual firing signals for the respective valves of said system, each firing signal recurring at said fundamental frequency so long as the pulses in said train have said predetermined harmonic frequency, said distributor for being arranged periodically to issue said feedback signal for recycling said oscillator concurrently with the commencement of each firing signal; c. means activated by the individual firing signals of said family for firing said valves in sequence; and d. synchronizing means coupled to said one set of conductors and to said oscillator for effectively preventing operation of the oscillator in the absence of a start command, said synchronizing means being activated on receipt of said start command to allow said oscillator to start producing discrete pulses in response to the first occurrence after such activation of a predetermined reference point which recurs in each cycle of alternating voltage.
21. The improved control means of claim 20 in which said synchronizing means comprises a. means for blocking the formation of any discrete pulse by said level detector, regardless of the magnitude of the integrator output signal, until disabled, and b. means acvitated on receipt of said start command for disabling said blocking means in response to the first occurrence after such activation of said predetermined reference point, thereby releasing said level detector for the formation of discrete pulses.
22. In a method of starting a signal generator which comprises an oscillator operative at a relatively high frequency f to produce a train of discrete pulses and a distributor responsive thereto for cyclically producing a predetermined sequence of N individual output signals each recurring at a frequency of f/N, the steps of: a. periodically deriving a timing signal of relatively short duration; b. initially blocking the operation of said oscillator in such a state that it will produce a discrete pulse as soon as unblocked; and c. subsequently unblocking said oscillator in response to the first occurrence of said timing signal after a predetermined start command is received.
23. The method according to claim 22 further including the steps of: d. initially locking said distributor in a preset pattern in readiness to produce a predetermined one of said N output signals in response to the first discrete pulse from said oscillator once unblocked; and e. subsequently unlocking said oscillator when said start command is received.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 用于电极阻抗测量的方法和设备 | 2020-05-11 | 256 |
| 图像传感器、包括其的电子系统及其操作方法 | 2020-05-14 | 303 |
| 单斜比较装置和包括该单斜比较装置的CMOS图像传感器 | 2020-05-14 | 859 |
| 一种人机协同模拟演练系统及其方法 | 2020-05-13 | 839 |
| 一种储罐底部油品泄漏的监测装置及监测方法 | 2020-05-14 | 203 |
| 具有改进的上行链路调平的分布式天线系统 | 2020-05-14 | 151 |
| 在分解的密集波分复用系统的一致性检查的方法和装置 | 2020-05-14 | 218 |
| 一种磁刺激穴位的中医诊疗装置 | 2020-05-08 | 707 |
| 一种基于OCC系统的二维星座辅助CSK传输系统 | 2020-05-12 | 368 |
| 一种板卡工作状态的控制设备和板卡测试系统 | 2020-05-12 | 318 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈