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1. 发明专利

DE4334128C2 未知
公开(公告)号：DE4334128C2
公开(公告)日：1995-12-07
申请号：DE4334128
申请日：1993-10-07
申请人： MATSUSHITA ELECTRIC WORKS LTD , SAKAMOTO HIROSHI
发明人： SAKAMOTO HIROSHI , TAMURA HIDEKI , FURUKAWA KAORU
IPC分类号： H02M3/28 , H02M3/335 , H02M3/338 , H03K3/64 , H03K17/732 , H02M7/48 , H02M7/523 , H02M7/5383
摘要： An inverter power supply operating at a high efficiency to provide an AC voltage to a load. The power source includes a DC voltage source and an output transformer with a primary winding, secondary winding, and a feedback winding. An FET is connected in series with the primary winding across the DC voltage source. The primary winding is connected to a capacitor to form a L-C resonant circuit which, in response to the switching of FET, provides across the primary winding an oscillation voltage to be applied through the secondary winding to drive a load, while inducing a feedback voltage across the feedback winding. The oscillation voltage is allowed to go negative at a point between FET and the primary winding. A biasing capacitor is connected to apply an offset voltage which is additive to the feedback voltage so as to give a bias voltage to FET. The power supply is characterized to include a level detector which issues a zero voltage signal when the oscillation voltage is detected to lower to at least zero level, and to include a pulse generator which, in response to the zero voltage signal, produces a pulse of a predetermined pulse-width which overrides the feedback voltage in such a manner as to enable FET to turn on for a ON-period determined by the pulse-width only after the oscillation voltage is lowered to at least zero level, whereby avoiding FET from flowing a current while the oscillation voltage is still positive and therefore reducing a switching loss.

2. 发明专利

DE4334128A1 Inverter voltage source with resonant primary winding output=transformer - has fet controlled switching of resonant transformer primary and null=point detector triggering pulse generator for fet timing control 未知
公开(公告)号：DE4334128A1
公开(公告)日：1994-04-21
申请号：DE4334128
申请日：1993-10-07
申请人： MATSUSHITA ELECTRIC WORKS LTD , SAKAMOTO HIROSHI
发明人： SAKAMOTO HIROSHI , TAMURA HIDEKI , FURUKAWA KAORU
IPC分类号： H02M3/28 , H02M3/335 , H02M3/338 , H03K3/64 , H03K17/732 , H02M7/48
摘要： An inverter voltage source supplied from a DC source (10) comprises a FET switching element (31) and a transformer (20) with primary (21) and feedback winding (23). The primary (21) and capacitor (25) form a parallel resonant circuit which when resonating energises the load (27) via the secondary (22). A starter circuit (11, 12) across the source (10) provides an initial offset voltage (VB) at the FET (31) gate which switches on to commence a self-excited oscillation in the resonant circuit (21, 25) maintained by the feedback winding (23) and voltage (VG). A null-point detector (60) which triggers a pulse generator (50) employing pulse-width control ensures that the conducting periods of the FET (31) are optimally timed to minimise switching losses. ADVANTAGE - Largely eliminates switching losses of similar FET controlled systems resulting in improved efficiency and stability.

3. 发明专利

JPH06225528A POWER-SUPPLY APPARATUS 失效
公开(公告)号：JPH06225528A
公开(公告)日：1994-08-12
申请号：JP15486493
申请日：1993-06-25
申请人： SAKAMOTO HIROSHI , MATSUSHITA ELECTRIC WORKS LTD
发明人： SAKAMOTO HIROSHI , TAMURA HIDEKI , FURUKAWA KAORU
IPC分类号： H02M3/28 , H02M3/335 , H02M3/338 , H03K3/64 , H03K17/732
摘要： PURPOSE:To increase the efficiency of a power supply by reducing the loss of a switching element. CONSTITUTION:A resonant circuit which is composed of a primary winding L1 for a transformer 1 and of a capacitor C1, a self-excited oscillation circuit which is provided with a switching element 2 connected in series with the circuit and with a feedback winding L3 connected to the gate of the switching element 2, a capacitor C2 which generates a bias voltage and a bias control circuit (R2, D1) which is interposed between a point A and a point B are provided. In addition, the resonant waveform of the point A is taken into, the period of a zero voltage or lower is detected from it, and a pulse signal is generated and output in the meantime. The generated pulse signal is superposed on the gate voltage of the switching element during the negative voltage period of the resonant waveform, the bias voltage is lowered, a zero-voltage switching operation is performed, and a stitching loss is reduced.

4. 发明专利

DE69923731T2 未知
公开(公告)号：DE69923731T2
公开(公告)日：2006-01-19
申请号：DE69923731
申请日：1999-06-11
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , YAMASHITA MIKIHIRO , KATSURA YOSHINORI
IPC分类号： H02M3/155 , H02M3/156 , H02M3/338

5. 发明专利

DE69825651T2 未知
公开(公告)号：DE69825651T2
公开(公告)日：2005-07-14
申请号：DE69825651
申请日：1998-03-25
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , YAMASHITA MIKIHIRO , KATSURA YOSHINORI
IPC分类号： H01F27/28 , H01F38/14 , H02J7/00 , H02M3/28 , H02M7/48 , G08C17/04

6. 发明专利

CA2595681A1 BODY FAT MEASURING DEVICE 未知
公开(公告)号：CA2595681A1
公开(公告)日：2006-08-03
申请号：CA2595681
申请日：2006-01-25
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , INAKAGATA SATORU , MURAKAMI SHUJI
IPC分类号： A61B5/05 , A61B5/107
摘要： A body fat measuring device comprises electrodes brought into contact with the waist portion of a subject, an optical sensor composed of a light applying section and a light receiving section, an impedance computing section for computing the impedance between the electrodes, a subcutaneous fat thickness computing section for computing the thickness of the subcutaneous fat of the subject from the value detected by the optical sensor, and a body fat computing section which subtracts the amount of subcutaneous fat determined using the thickness of the subcutaneous fat computed by the subcutaneous thickness computing section from the total fat amount of the subject determined using the impedance computed by the impedance computing section so as to determine the visceral fat amount of the subject. With this, not only the accuracy of measurement of the visceral fat amount is improved but also the visceral fat amount of the subject can be easily computed even without database.

7. 发明专利

DE69923731D1 未知
公开(公告)号：DE69923731D1
公开(公告)日：2005-03-24
申请号：DE69923731
申请日：1999-06-11
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , YAMASHITA MIKIHIRO , KATSURA YOSHINORI
IPC分类号： H02M3/155 , H02M3/156 , H02M3/338

8. 发明专利

CA2595681C BODY FAT MEASURING DEVICE 未知
公开(公告)号：CA2595681C
公开(公告)日：2011-11-01
申请号：CA2595681
申请日：2006-01-25
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , INAKAGATA SATORU , MURAKAMI SHUJI
IPC分类号： A61B5/05 , A61B5/107
摘要： A body fat measuring device comprises electrodes brought into contact with the waist portion of a subject, an optical sensor composed of a light applying section and a light receiving section, an impedance computing section for computing the impedance between the electrodes, a subcutaneous fat thickness computing section for computing the thickness of the subcutaneous fat of the subject from the value detected by the optical sensor, and a body fat computing section which subtracts the amount of subcutaneous fat determined using the thickness of the subcutaneous fat computed by the subcutaneous thickness computing section from the total fat amount of the subject determined using the impedance computed by the impedance computing section so as to determine the visceral fat amount of the subject. With this, not only the accuracy of measurement of the visceral fat amount is improved but also the visceral fat amount of the subject can be easily computed even without a database.

9. 发明专利

DE69720176T2 未知
公开(公告)号：DE69720176T2
公开(公告)日：2003-10-23
申请号：DE69720176
申请日：1997-12-23
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , ABE HIDEAKI
IPC分类号： H02J7/10 , H02M3/338 , H02M7/537
摘要： A resistor is inserted between the gate of an FET and a feedback winding to produce a delay in a voltage applied to the gate of the FET in comparison with a voltage of the feedback winding due to the influence of an input capacitance existing at the gate of the FET. Thus, a current does not flow before a drain voltage of the FET reaches zero volt, thereby making it possible to reduce the switching loss.

10. 发明专利

DE69702381T2 未知
公开(公告)号：DE69702381T2
公开(公告)日：2000-11-30
申请号：DE69702381
申请日：1997-12-23
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , YAMASHITA MIKIHIRO , KATSURA YOSHINORI
IPC分类号： H01F38/14 , H02J5/00 , H02J7/00
摘要： A primary winding T1 as anoscillation winding T1 is intermittently oscillation-driven and the resultant driving signal is used as a signal for detecting an appliance body B. A power supply body A receives the response signal from the appliance body B to detect the appliance body B. An intermittent driving means M includes the induction winding T2 wound on the same core as the oscillation winding T1 and a diode D1 and capacitor C2 for rectifying/smoothing the voltage induced in the induction winding T2. A control transistor Q2 operated by the output voltage V1 of the intermittent driving means M is connected to the control end of an oscillation transistor Q1 so that the oscillation transistor Q1 is intermittently driven by an oscillation voltage VC.

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