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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

FR2476404A1 未知
公开(公告)号：FR2476404A1
公开(公告)日：1981-08-21
申请号：FR8102898
申请日：1981-02-13
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： KAKUMOTO HIROMI , FURUKAWA KAORU
IPC分类号： H02J7/02 , H02M3/155 , H02J7/10 , H02M7/217 , H02P13/24
摘要： A battery charger includes a transistor inverter. The transistor inverter includes an oscillation transformer and a switching transistor for controlling a current flowing through a primary coil of the oscillation transformer. This current charges the battery when the transistor is on. While the switching transistor is in an off state, charging current is supplied to the battery from a secondary coil of the oscillation transformer. The period of time where the switching transistor is in an on state is controlled depending on the amplitude of a supply voltage. Accordingly, the average value of a charging current to the rechargeable battery is automatically kept substantially constant despite variations in the amplitude of the alternating current voltage supply.

3. 发明专利

DE4316945A1 Inverter-type voltage supply - uses forward voltage stabilising current circuit for lowering offset voltage by discharging forward voltage capacitor through FET 未知
公开(公告)号：DE4316945A1
公开(公告)日：1993-12-02
申请号：DE4316945
申请日：1993-05-21
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , FURUKAWA KAORU
IPC分类号： H02M3/338 , H02M7/48
摘要： The voltage supply includes a forward voltage stabilising current circuit which lowers the offset-voltage through discharge of the forward voltage capacitor (12) over the switched on FET (31). The FET is switched on only during a constant ON-time period, independent of the DC voltage slope inside a limited region. A forward voltage compensation device generates a negative voltage which is superimposed on the offset voltage. The offset voltage is reduced to a negative value so that the forward voltage is lowered when the DC voltage rises above the limited region. ADVANTAGE - Can use FETs with relatively low breakdown voltage.

4. 发明专利

DE3517628A1 未知
公开(公告)号：DE3517628A1
公开(公告)日：1985-12-19
申请号：DE3517628
申请日：1985-05-15
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： SAKAUE HIRONOBU , FURUKAWA KAORU
IPC分类号： H02J7/02 , H02M3/156 , H02J7/04

5. 发明专利

FR2467501A1 未知
公开(公告)号：FR2467501A1
公开(公告)日：1981-04-17
申请号：FR8021869
申请日：1980-10-13
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： KAKUMOTO HIROMI , FURUKAWA KAORU
IPC分类号： H01M10/44 , H02J7/10 , H02J7/00 , H02J7/02
摘要： A diode is disposed in the vicinity of a rechargeable battery. A current is applied to the diode from a current generating circuit. The current generating circuit comprises a thermistor which is responsive to the ambient temperature, so that a current associated with the ambient temperature is applied from the current generating circuit to the diode. The diode gives rise to a forward voltage drop, which is changeable as a function of the battery temperature. Accordingly, the forward voltage drop across the diode is changeable as a function of the ambient temperature and the battery temperature. The forward voltage drop across the diode is amplified to be used as a reference voltage. On the other hand, the rechargeable battery is supplied with a charging current from a power supply through a thyristor. The gate electrode of the thyristor is connected to receive the reference voltage and the cathode of the thyristor is connected to the battery. Accordingly, the thyristor is turned off if and when the difference between the reference voltage and the battery voltage becomes smaller than the switching voltage of the thyristor.

6. 发明专利

FR2476404B1 未知
公开(公告)号：FR2476404B1
公开(公告)日：1986-10-17
申请号：FR8102898
申请日：1981-02-13
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： KAKUMOTO HIROMI , FURUKAWA KAORU
IPC分类号： H02J7/02 , H02M3/155 , H02J7/10 , H02M7/217 , H02P13/24
摘要： A battery charger includes a transistor inverter. The transistor inverter includes an oscillation transformer and a switching transistor for controlling a current flowing through a primary coil of the oscillation transformer. This current charges the battery when the transistor is on. While the switching transistor is in an off state, charging current is supplied to the battery from a secondary coil of the oscillation transformer. The period of time where the switching transistor is in an on state is controlled depending on the amplitude of a supply voltage. Accordingly, the average value of a charging current to the rechargeable battery is automatically kept substantially constant despite variations in the amplitude of the alternating current voltage supply.

7. 发明专利

DE3038538A1 未知
公开(公告)号：DE3038538A1
公开(公告)日：1981-04-30
申请号：DE3038538
申请日：1980-10-11
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： KAKUMOTO HIROMI , FURUKAWA KAORU
IPC分类号： H02J7/10 , H01M10/44 , H02J7/00
摘要： A diode is disposed in the vicinity of a rechargeable battery. A current is applied to the diode from a current generating circuit. The current generating circuit comprises a thermistor which is responsive to the ambient temperature, so that a current associated with the ambient temperature is applied from the current generating circuit to the diode. The diode gives rise to a forward voltage drop, which is changeable as a function of the battery temperature. Accordingly, the forward voltage drop across the diode is changeable as a function of the ambient temperature and the battery temperature. The forward voltage drop across the diode is amplified to be used as a reference voltage. On the other hand, the rechargeable battery is supplied with a charging current from a power supply through a thyristor. The gate electrode of the thyristor is connected to receive the reference voltage and the cathode of the thyristor is connected to the battery. Accordingly, the thyristor is turned off if and when the difference between the reference voltage and the battery voltage becomes smaller than the switching voltage of the thyristor.

8. 发明专利

DE3104688A1 未知
公开(公告)号：DE3104688A1
公开(公告)日：1982-02-18
申请号：DE3104688
申请日：1981-02-10
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： KAKUMOTO HIROMI , FURUKAWA KAORU
IPC分类号： H02J7/10 , H02J7/02 , H02M3/155 , H02J7/04
摘要： A battery charger includes a transistor inverter. The transistor inverter includes an oscillation transformer and a switching transistor for controlling a current flowing through a primary coil of the oscillation transformer. This current charges the battery when the transistor is on. While the switching transistor is in an off state, charging current is supplied to the battery from a secondary coil of the oscillation transformer. The period of time where the switching transistor is in an on state is controlled depending on the amplitude of a supply voltage. Accordingly, the average value of a charging current to the rechargeable battery is automatically kept substantially constant despite variations in the amplitude of the alternating current voltage supply.

9. 发明专利

DE4316945C2 未知
公开(公告)号：DE4316945C2
公开(公告)日：1995-11-16
申请号：DE4316945
申请日：1993-05-21
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： TAMURA HIDEKI , FURUKAWA KAORU
IPC分类号： H02M3/338 , H02M7/48
摘要： An inverter power supply includes a DC supply providing a DC voltage from an AC mains, a transformer having primary, secondary, and feedback windings, and a self-excited oscillator energized by the DC supply to generate a high frequency voltage across the primary winding and induces across the secondary winding an output AC voltage for driving a load. The oscillator comprises an FET connected in series with the primary winding. A biasing capacitor is connected in series with the feedback winding across a source-gate path of FET for providing an offset voltage which is additive to a feedback voltage at the feedback winding to give a bias applied to a gate of FET so as to alternately turn on and off FET for self-excited oscillation. Also included is a bias stabilizing circuit which lowers the offset voltage by discharging the biasing capacitor through FET being turned on, thereby driving FET turned on only for substantially a constant ON-time period irrespective of an increase in the DC voltage within a limited range. The power supply is characterized to include a compensation circuit which produces a negative voltage to be superimposed to the offset voltage of the biasing capacitor, thereby enabling to lower the offset voltage negative even when the DC voltage increases over the limited range, thereby keeping the ON-time period of FET substantially constant over a wide range of variations in the DC voltage.

10. 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.

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