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公开(公告)号：EP1423909A4
公开(公告)日：2008-09-17
申请号：EP02759419
申请日：2002-08-20
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO , FANG MIN
CPC classification number: H02M7/53803 , H02M2001/0009
Abstract: A sample and hold circuit (28) for receiving a signal comprising a plurality of pulses at node LS from a sensing circuit (ru) and a circuit for supplying a timing signal (26) for the sample and hold circuit and the sample and hold circuit outputs a sinusoidal signal at the output node IFBU.
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公开(公告)号：EP1327306A4
公开(公告)日：2005-06-22
申请号：EP01971169
申请日：2001-09-18
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO , VUKICEVIC MARIJANA
Abstract: A circuit (12) for recovering a current sense signal which is offset by a common mode displacement, such is the case when the signal is the voltage across a current sense resistor located on the high side bus or between the switches of a motor controller circuit. The circuit of the present invention converts the voltage across the resistor into a pulse code modulated (PWM) (OUTPUT) data, then downshifts the voltage, such that the signal of interest may be processed and recovered at the lower voltage for current feedback control purposes. The conversion of the measured current into a PWM signal is performed such that the PWM signal is synchronous with the motor PWM frequency. Although the output (MOTOR PHASE) of the IC is synchronous with the motor PWM frequency, the output duty cycle is completely independent of the motor PWM duty cycle. In this way, the reconstructed sampled output of the IC is exactly equal to the fundamental motor current, without the effect of ripple current.
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公开(公告)号：EP1488504A4
公开(公告)日：2017-11-15
申请号：EP03745679
申请日：2003-03-28
Applicant: INT RECTIFIER CORP
Inventor： HO EDDY YING YIN , TAKAHASHI TOSHIO
CPC classification number: H02P8/12 , G01R19/0092 , H02M7/5395 , H02M2001/0009 , H02P23/14 , H02P2205/01
Abstract: A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The non-observable regions can be further reduced by omitting deadtime insertions for switch actuations when output current is higher than a given threshold. Voltage command vectors in non-observable areas can be constructed by two time averaged vectors one of which is constructed to obtain an observable DC bus current reflecting motor phase current. The additive vectors have the same combined time average value as that of the voltage command vector in order to preserve volt-seconds. Current samples may also be averaged to provide a more accurate reconstruction of phase current. Current samples are time delayed to avoid transients for more accurate readings. When three phase PWM inverter modulation results in inability to determine the motor phase current from the DC bus measurement, the technique includes dynamically switching to two phase PWM modulation to reduce the time interval when the motor phase current is not determinable through the DC bus current measurement.
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14.发明公开HIGH FREQUENCY PARTIAL BOOST POWER FACTOR CORRECTION CONTROL CIRCUIT AND METHOD 审中-公开与器件的增益功率因数校正和程序高频率控制电路
公开(公告)号：EP1774421A4
公开(公告)日：2009-01-21
申请号：EP05789940
申请日：2005-06-28
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO , LI YONG
CPC classification number: H02M1/4225 , Y02B70/126
Abstract: A circuit for providing power factor correction comprising a boost converter circuit having a boost inductance and a power factor correction switch coupled in series with the boost inductance, the boost inductance and power factor correction switch being coupled across the output of a rectifier being supplied with AC power from an AC line, the boost converter circuit further comprising a boost diode coupled to a junction between the inductor and the switch, an output of the boost diode coupled to an output capacitor, a DC bus voltage being provided across the output capacitor, further comprising a control circuit receiving as inputs a rectified AC input voltage from the rectifier, a signal proportional to current through the inductor and the DC bus voltage across the capacitor, and wherein the control circuit provides a pulse width modulated signal to control the on time of the PFC switch, further comprising an enable/disable circuit receiving as inputs the rectified AC input voltage and the DC bus voltage, the circuit instantaneously comparing the rectified AC input voltage and the DC bus voltage and controlling the control circuit whereby the control circuit provides the pulse width modulated signal to control the PFC switch when the rectified AC input voltage is less than the DC bus voltage and disables the generation of the pulse width modulated signal to the PFC switch when the rectified AC input voltage is greater than DC bus voltage.
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公开(公告)号：JP2002139535A
公开(公告)日：2002-05-17
申请号：JP2001162897
申请日：2001-05-30
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO
Abstract: PROBLEM TO BE SOLVED: To detect a fault of insulation of a conductor of a motor. SOLUTION: A current is detected by a current transformer having a small common-mode leakage current flowing in a ground wire cable of a motor controller circuit, and an average leakage current is generated from the detected current by a single-pole low-pass filter and converted into a PWM signal. A pulse generator generates pulse signals at a leading and trailing edges of the PWM signal. The pair of level shifters shift the leading-edge and trailing-edge pulse signals from a floating high-tension side voltage to a voltage based on the ground. The PWM signal having a duty cycle changing relative to the common-mode leakage current is generated from the level-shifted pulse signal by a pulse regeneration circuit, and the degree of motor insulation deterioration is calculated and determined by a digital signal processor.
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Patent Agency Ranking
公开(公告)号：JP2001008492A
公开(公告)日：2001-01-12
申请号：JP2000132669
申请日：2000-05-01
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO
IPC: G01R31/02 , H02H7/08 , H02H7/085 , H02H9/00 , H02P27/06 , H02P29/02 , H02P7/00 , H02M1/00 , H02M7/48 , H02P7/63
Abstract: PROBLEM TO BE SOLVED: To prevent troubles (turn-on due to malfunction or the like) attributed to an additional switching operation or the Miller effect by conducting soft shutdown of a switching device in a motor control circuit when it failes. SOLUTION: A failure protecting circuit for a motor controller is provided with a soft shutdown circuit and a short-circuit protection circuit. Soft shutdown of all six switching devices in the motor controller occurs if failure occurs. Therefore, no further switching operation is conducted, thereby preventing generation of situations, such a turn-on operation due to a failure caused by further switching operation and the Miller effect related thereto. The short- circuit protection circuit detects the VCE of IGBT36, using a DESAT (desaturating) circuit of a gate driver IC. At the occurrence of a short circuit, IGBT a pulled up from a low on-state voltage, thereby improving the output characteristics.
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公开(公告)号：DE19910755B4
公开(公告)日：2007-04-26
申请号：DE19910755
申请日：1999-03-11
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO , TAM DAVID C , PARRY JOHN , TCHAMDSOU ARISTIDE , CHEY CHRISTOPHER C , DUBHASHI AJIT
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公开(公告)号：AU2003226186A8
公开(公告)日：2003-10-13
申请号：AU2003226186
申请日：2003-03-28
Applicant: INT RECTIFIER CORP
Inventor： HO EDDY YING YIN , TAKAHASHI TOSHIO
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公开(公告)号：DE10125910A1
公开(公告)日：2002-07-25
申请号：DE10125910
申请日：2001-05-28
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO
Abstract: Motor insulation degradation is determined using circuitry to sense the common mode leakage current from the ground wire cable. In a preferred embodiment of the invention, a small current transformer detects the common mode leakage current flowing in the ground wire cable of the motor controller circuit. A single pole low pass filter generates an average leakage current signal from the sensed current. The average leakage current signal is converted to a PWM signal. A pulse generator receives the PWM signal and generates pulse signals at the rising and falling edges of the PWM signal. A pair of level shifters receive the rising edge and falling edge pulse signals and transpose those signals from a floating high voltage to a voltage referenced to ground. A pulse reconstruction circuit receives the level shifted pulse signals and reconstructs a pulse width modulated signal having a duty cycle which varies with respect to the magnitude of the common mode leakage current. This output signal is input directly to a microcontroller or a digital signal processor to calculate and determine the amount of motor insulation degradation.
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公开(公告)号：AU9108801A
公开(公告)日：2002-03-26
申请号：AU9108801
申请日：2001-09-18
Applicant: INT RECTIFIER CORP
Inventor： TAKAHASHI TOSHIO , VUKICEVIC MARIJANA
Abstract: A circuit for recovering a current sense signal which is offset by a common mode displacement, such is the case when the signal is the voltage across a current sense resistor located on the high side bus or between the switches of a motor controller circuit. The circuit of the present invention converts the voltage across the resistor into a pulse code modulated (PWM) data, then downshifts the voltage, such that the signal of interest may be processed and recovered at the lower voltage for current feedback control purposes. The conversion of the measured current into a PWM signal is performed such that the PWM signal is synchronous with the motor PWM frequency. Although the output of the IC is synchronous with the motor PWM frequency, the output duty cycle is completely independent of the motor PWM duty cycle. In this way, the reconstructed sampled output of the IC is exactly equal to the fundamental motor current, without the effect of ripple current.
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