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公开(公告)号：US11443935B2
公开(公告)日：2022-09-13
申请号：US17053397
申请日：2018-05-31
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
Abstract: An acceleration voltage generator is configured to cause a power MOSFET to turn on or off to switch a high direct-current voltage, so as to generate a high-voltage pulse for an ejection of ions from an ion ejector. A drive signal is used to cause the power MOSFET to turn on, and further includes a secondary drive signal to recharge a gate capacitance to cause the power MOSFET to stay in an on-state. In a drive signal generator, edge detection circuits generate an edge detection signal based on a start signal; selection circuits generate a primary drive signal by adjusting the edge detection signal in its signal width; and a secondary drive signal generator includes multiple circuit elements such as a semiconductor element, and generates the secondary drive signal.
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公开(公告)号：US09583324B2
公开(公告)日：2017-02-28
申请号：US14906738
申请日：2013-07-23
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
CPC classification number: H01J49/022 , H01J49/0095 , H02M1/32 , H02M3/28 , H02M7/06 , H02M7/10 , H02M2001/0077
Abstract: An excessive overshoot preventing unit (16) is connected to a loop in which a command voltage Vf according to a difference between: a voltage obtained by dividing an output voltage Vout as a high voltage; and a control voltage V cont set from the outside is obtained and fed back to each of drive circuits (3 and 5) of a positive voltage generating unit (2) and a negative voltage generating unit (4). The excessive overshoot preventing unit (16) clamps the command voltage Vf at a voltage value according to the control voltage Vcont. An overshoot that occurs in the voltage generating unit (2 or 4) at the time of polarity switching mainly depends on a circuit constant, and hence the amount of overshoot is excessive in the case of a low-voltage output even if the amount of overshoot is optimal in the case of a rated output. To deal with this, in this power unit, the overshoot of the command voltage Vf in suppressed by the excessive overshoot preventing unit (16), and hence the output voltage can be promptly settled to a target voltage even in the case of a low-voltage output.
Abstract translation: 过负荷防止单元（16）连接到其中根据以下之间的差的指令电压Vf的环路：通过将输出电压Vout分压为高电压而获得的电压; 并获得从外部设定的控制电压V cont，并将其反馈到正电压产生单元（2）和负电压产生单元（4）的每个驱动电路（3和5）。 过冲保护单元16根据控制电压Vcont将电压值钳位在指令电压Vf上。 在极性切换时在电压产生单元（2或4）中发生的过冲主要取决于电路常数，因此即使过冲量也是低电压输出的情况下的过冲量过大 在额定输出的情况下是最佳的。 为了解决这个问题，在该功率单元中，即使在低功率单元的情况下，即使在过冲保护单元（16）中抑制的指令电压Vf的过冲以及因此的输出电压也能迅速地达到目标电压， 电压输出。
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公开(公告)号：US20130234018A1
公开(公告)日：2013-09-12
申请号：US13639474
申请日：2011-03-03
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
IPC: H01J49/28
CPC classification number: H01J49/28 , H01J49/022 , H01J49/4215
Abstract: Provided is a quadrupole mass spectrometer including direct-current voltage sources having response characteristics which ensure that the response time of the direct-current voltage will be shorter than the period of time required for an ion having the highest mass-to-charge ratio (m/z) among the ions introduced into a quadrupole mass filter to pass through this filter. Main rod electrodes and pre-rod electrodes are connected to each other via primary differentiation circuits. Thus, in the transient state of the voltage change due to the switching of the mass-to-charge ratio, among the ions entering the quadrupole mass filter, ions having low m/z values can be removed by a pre-electrode unit, and ions having high m/z values can be removed by a main electrode unit. Accordingly, a large amount of ions can be prevented from passing through the filter and entering an ion detector.
Abstract translation: 提供了一种四极质谱仪，其包括具有响应特性的直流电压源，其确保直流电压的响应时间将短于具有最高质荷比的离子所需的时间（m / z）引入四极质量过滤器中的离子通过该过滤器。 主杆电极和预棒电极通过一次微分电路相互连接。 因此，在由质荷比的切换引起的电压变化的瞬态中，在进入四极质量过滤器的离子中，通过预电极单元可以除去具有低m / z值的离子， 可以通过主电极单元去除具有高m / z值的离子。 因此，可以防止大量的离子通过过滤器并进入离子检测器。
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公开(公告)号：US11430649B2
公开(公告)日：2022-08-30
申请号：US17058179
申请日：2018-05-28
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani , Tomoyuki Oshiro , Yuta Miyazaki
Abstract: An analytical device includes: a first acceleration unit including a first acceleration electrode to which a pulse voltage for accelerating ions is applied; a flight tube; a second acceleration unit that is arranged between the first acceleration unit and the flight tube, and includes a second acceleration electrode to which a voltage for accelerating the ions is applied; an ion detector that detects the ions; and a capacitance adjustment unit that causes adjustment of a capacitance between at least one set of electrodes among a plurality of electrodes arranged in the first acceleration unit, the second acceleration unit, and a flight tube.
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公开(公告)号：US10593531B2
公开(公告)日：2020-03-17
申请号：US16315883
申请日：2016-08-22
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
Abstract: An acceleration voltage generator generates a high-voltage pulse applied to a push-out electrode, by operating a switch section to turn on and off a high direct-current voltage generated by a high-voltage power supply. A drive pulse signal is supplied from a controller to the switch section through a primary-side drive section, transformer, and secondary-side drive section. A primary-voltage controller receives a measurement result of ambient temperature of the acceleration voltage generator from a temperature sensor, and controls a primary-side power supply to change a primary-side voltage according to the temperature, thereby adjusting the voltage applied between the two ends of a primary winding of the transformer. The adjustment made on the primary-side voltage changes a slope angle of rise of a gate voltage in the MOSFET, and enables a correction to a discrepancy in the timing of the rise/fall of the high-voltage pulse caused by change in ambient temperature.
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Patent Agency Ranking
公开(公告)号：US09431226B2
公开(公告)日：2016-08-30
申请号：US14440380
申请日：2012-11-05
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
CPC classification number: H01J49/022 , H01J49/165 , H01J49/36 , H02M3/073 , H02M3/33507 , H02M7/103 , H02M2001/0077 , H02M2003/071
Abstract: An output terminal of a positive voltage generating circuit and an output terminal of a negative voltage generating circuit are connected in series, and an output terminal of the negative voltage generating circuit is connected to a ground via a resistor. A switching circuit and a series connection circuit of resistors are connected in parallel to each other between the output terminals of the positive voltage generating circuit and the negative voltage generating circuit. The switching circuit is on-off driven by a voltage signal taken from a junction point between the resistors, and the switching circuit is on-off driven by a voltage signal taken from a junction point between the resistors. Accordingly, when the polarity of an output voltage is switched, electric charges accumulated up to that point are discharged through the switching circuit of a voltage OFF-side polarity, so that the voltage quickly falls.
Abstract translation: 正电压发生电路的输出端子和负电压发生电路的输出端子串联连接，负电压产生电路的输出端子经由电阻器连接到地。 电阻器的开关电路和串联电路在正电压发生电路的输出端子和负电压产生电路之间并联连接。 开关电路由从电阻器之间的接点取得的电压信号驱动，并且开关电路由从电阻器之间的接合点获取的电压信号驱动。 因此，当切换输出电压的极性时，累积到该点的电荷通过电压OFF侧极性的开关电路放电，使得电压迅速下降。
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公开(公告)号：US11101127B2
公开(公告)日：2021-08-24
申请号：US16755729
申请日：2017-11-02
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
Abstract: An acceleration voltage generator (7) generates a high-voltage pulse to be applied to an electrode in an orthogonal accelerator by turning on/off a high DC voltage generated by a high-voltage power source through MOSFETs (741) in a switch circuit (74). A controller (6) sends driving pulse signals to the switch circuit (74) through a primary-side driver section (71), transformer (72) and secondary driver section (73). An adjustment circuit (742) formed by a gate resistor (742a) and gate capacitor (742b) is provided between the secondary-side driver section (73) and the MOSFET (741). The resistance value of the resistor (742a) and the capacitance value of the capacitor (742b) are determined so as to suppress an overshoot of the gate voltage due to the resonance while preventing a decrease in steepness of the waveform in its rising and falling phases.
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公开(公告)号：US10388507B2
公开(公告)日：2019-08-20
申请号：US16069214
申请日：2016-01-12
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
Abstract: An acceleration voltage generator (7) generates a high-voltage pulse to be applied to a push-out electrode (11), by operating a switch section (74) to turn on and off a high direct-current voltage generated by a high-voltage power supply (75). A drive pulse signal is supplied from a controller (6) to the switch section (74) through a primary-side drive section (71), transformer (72), and secondary-side drive section (73). The measurement period of a repeated measurement is changed according to a target m/z range. A primary-voltage controller (61) controls a primary-side power supply (76) to change a primary-side voltage according to the measurement period, thereby adjusting the voltage to be applied between the two ends of a primary winding of the transformer (72) by the primary-side drive section (71). The pulse signal fed to the switch section (74) overshoots due to LC resonance. Due to this overshoot, the voltage at the point in time where the pulse signal begins to rise varies depending on the measurement period. Such a variation of the voltage at the point in time where the pulse signal begins to rise causes a discrepancy in the timing at which the rising slope crosses the threshold voltage of MOSFET. However, this discrepancy can be corrected by adjusting the primary-side voltage. As a result, high mass accuracy can be achieved irrespective of the measurement period.
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公开(公告)号：US20150287580A1
公开(公告)日：2015-10-08
申请号：US14440380
申请日：2012-11-05
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
CPC classification number: H01J49/022 , H01J49/165 , H01J49/36 , H02M3/073 , H02M3/33507 , H02M7/103 , H02M2001/0077 , H02M2003/071
Abstract: An output terminal of a positive voltage generating circuit and an output terminal of a negative voltage generating circuit are connected in series, and an output terminal of the negative voltage generating circuit is connected to a ground via a resistor. A switching circuit and a series connection circuit of resistors are connected in parallel to each other between the output terminals of the positive voltage generating circuit and the negative voltage generating circuit. The switching circuit is on-off driven by a voltage signal taken from a junction point between the resistors, and the switching circuit is on-off driven by a voltage signal taken from a junction point between the resistors. Accordingly, when the polarity of an output voltage is switched, electric charges accumulated up to that point are discharged through the switching circuit of a voltage OFF-side polarity, so that the voltage quickly falls.
Abstract translation: 正电压发生电路的输出端子和负电压发生电路的输出端子串联连接，负电压产生电路的输出端子经由电阻器连接到地。 电阻器的开关电路和串联电路在正电压发生电路的输出端子和负电压产生电路之间并联连接。 开关电路由从电阻器之间的接点取得的电压信号驱动，并且开关电路由从电阻器之间的接合点获取的电压信号驱动。 因此，当切换输出电压的极性时，累积到该点的电荷通过电压OFF侧极性的开关电路放电，使得电压迅速下降。
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公开(公告)号：US10229822B2
公开(公告)日：2019-03-12
申请号：US15520112
申请日：2014-10-20
Applicant: SHIMADZU CORPORATION
Inventor： Shiro Mizutani
Abstract: A high-voltage power source for applying high voltage to a nozzle of an ESI ion source includes a charge release assistant section including switch circuits and other elements for forcing electric charges accumulated at output terminals to be discharged in a polarity-switching operation, whereby the positive/negative switching of the polarity of the output voltage can be quickly performed. For example, when the voltage applied to the nozzle needs to be changed from V1 to V2 (where V1 and V2 are positive, and V1>V2), a voltage control section operates a positive voltage generation section and negative voltage generation section so as to temporarily provide a negative output voltage. After a predetermined period of time, the voltage control section operates the positive voltage generation section and negative voltage generation section so as to provide voltage V2.
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