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1. 发明授权

US4737851A On/off control circuitry for television 失效
标题翻译：电视开/关控制电路
公开(公告)号：US4737851A
公开(公告)日：1988-04-12
申请号：US42077
申请日：1987-04-24
申请人： Robert L. Shanley, II , Jack Craft , Michael L. Low , Jeffery B. Lendaro
发明人： Robert L. Shanley, II , Jack Craft , Michael L. Low , Jeffery B. Lendaro
IPC分类号： H02M3/28 , H04N5/63
CPC分类号： H04N5/63 , H02M2001/0032 , Y02B70/16
摘要： A control circuit of a television receiver power supply is constructed using a plurality of transistors operating in a common base configuration. The base electrodes of each of the transistors is coupled to a common conductor rail line that maintains the collector currents in the transistors temperature compensated over a wide range of operating temperatures during normal operation power-up mode of the receiver. In a standby mode of the receiver, power dissipation in the transistors is reduced by applying an on/off control signal to the common conductor rail line that prevents the flow of the collector currents in each of the transistors. Consequently, the supply current requirement of the control circuit is reduced during the standby mode.

2. 发明授权

US4734771A Start-up control circuitry for a television apparatus 失效
标题翻译：电视机的起动控制电路
公开(公告)号：US4734771A
公开(公告)日：1988-03-29
申请号：US42078
申请日：1987-04-24
申请人： Jeffery B. Lendaro , Robert L. Shanley, II , Jack Craft , Michael L. Low
发明人： Jeffery B. Lendaro , Robert L. Shanley, II , Jack Craft , Michael L. Low
IPC分类号： H02M3/28 , H04N5/63
CPC分类号： H04N5/63 , H02M2001/0032 , Y02B70/16
摘要： A supply voltage is developed in accordance with an on/off control signal of a remote receiver during a start-up interval and during a power-up mode of operation of a television power supply. During a standby mode of operation, the supply voltage is switched off. The supply voltage produces a supply current in an oscillator that produces a signal at a horizontal rate related frequency. The supply voltage also produces a base drive current in a switching transistor of a horizontal driver only during the start-up interval. During a power-up mode, a run supply voltage is coupled to the oscillator and to the driver.

3. 发明授权

US4853647A Current gain compensation arrangement 失效
标题翻译：电流增益补偿装置
公开(公告)号：US4853647A
公开(公告)日：1989-08-01
申请号：US188996
申请日：1988-05-02
申请人： Michael L. Low , Jack Craft
发明人： Michael L. Low , Jack Craft
IPC分类号： G05F3/22 , H03F3/45
CPC分类号： G05F3/225 , H03F3/45071 , H03F3/45479
摘要： A first pair of transistors, Q721 and Q723, operating, each, as an emitter follower, has a relatively low emitter current. The emitter followers drive corresponding base electrodes of transistors of a second pair of transistors, Q148 and Q149, coupled as a differential amplifier. A current gain compensating transistor Q726 has a current gain that tracks current gain variations of each of the transistors of the second pair. A base electrode current of the compensating transistor and a second current i.sub.Q727 that is unaffected by current gain variations are summed. The summed current is coupled via transistors Q722 and Q724 of a current mirror arrangement to first and second junction terminals, 610e and 610f. The junction terminals are coupled between the respective emitter electrodes of the emitter followers and the base electrodes of the second pair. Currents generated by the current mirror arrangement compensate for variations in the base currents in the transistors of the second pair so as to maintain the emitter currents in the emitter followers substantially unaffected by these variations.
摘要翻译：作为射极跟随器的第一对晶体管Q721和Q723具有相对低的发射极电流。发射极跟随器驱动耦合作为差分放大器的第二对晶体管Q148和Q149的晶体管的相应基极。电流增益补偿晶体管Q726具有跟踪第二对的每个晶体管的电流增益变化的电流增益。补偿晶体管的基极电流和不受电流增益变化影响的第二电流iQ727相加。总和电流通过电流镜配置的晶体管Q722和Q724耦合到第一和第二接合端子610e和610f。结端子耦合在发射极跟随器的相应发射极和第二对的基极之间。由电流反射镜装置产生的电流补偿第二对晶体管中的基极电流的变化，以便保持发射极跟随器中的发射极电流基本上不受这些变化的影响。

4. 发明授权

US4714871A Level shifter for a power supply regulator in a television apparatus 失效
标题翻译：电视设备中电源调节器的电平移位器
公开(公告)号：US4714871A
公开(公告)日：1987-12-22
申请号：US943187
申请日：1986-12-18
申请人： Jack Craft , Michael L. Low , Bernard J. Yorkanis
发明人： Jack Craft , Michael L. Low , Bernard J. Yorkanis
IPC分类号： H04N3/18 , G05F3/22 , G05F3/26 , G05F3/28 , H04N3/22 , H04N5/63 , G05F3/20
CPC分类号： G05F3/265 , G05F3/225 , H04N5/63
摘要： A level shifter receives a variable input voltage such as a beam current representative voltage of a cathode ray tube and produces an output voltage that changes when the input voltage changes such that the output voltage is level shifted relative to the input voltage. The output voltage is coupled to an input terminal of an error amplifier of a power supply voltage regulator of a television receiver. The level shifter includes a current mirror arrangement responsive to the input voltage. A band gap type voltage source determines the amount of level shifting that is produced by the level shifter.

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