EP0338512A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Engine driven generator
Assignee: Shinko Electric Co Ltd
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Filing: 1989-04-18
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Granted: —
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Expires: 2009-04-18
Abstract
Abstract An engine driven generator having an engine (1), a three-phase sysnchronous generator (3) to be driven by the engine (1), a direct current power supply (15) for actuating the engine (1), a direct current/alternating current power supply converter (13) for converting a direct current power of the direct current power supply (15) to an alternating current power and supplying the alternating current power to the three-phase synchronous generator (3): (1) characterized in further comprising a full-wave rectifier (11) for rectifying an output of the three-phase generator (3) and supplying the thus rectified output to the direct current/alternating current power converter (13); a switching unit (12) for switching output terminals of the direct current/alternating current power converter (13) to terminals of an outer device or output terminals of the synchrnous generator (3); a rotor position detector (10) for detecting a position of rotor of the synchronous generator (3); and (2) characterized in that during the period when the three-phase synchronous generator (3) performs the power generating operation after completing the actuation of the engine (1), a pair of positive and negative first single- phase switching elements are subjected to successive ON/OFF control operation while one pair of two-phase switching elements and the other pair of two-phase switching elements are alternated for each half of the time and subjected to PWM control operation so that output terminals corresponding to the two-phase switching elements are short-circuited with each other.
Inventors
- 👤 Yuzo C/O Toyohashi Factory Of Takakado
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:01
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; F; F02; F02N; F02N11/00; F02N11/04; H02J7/1469; H02J7/1492; H02P; H02P9/00; H02P9/009; H02P9/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
239 words
An engine driven generator having no exclusive starter comprising: an engine (1); a synchronous generator (3) having a rotor and coupled to a shaft of the engine (1); a rotor position detector for detecting the position of the rotor of the synchronous generator (3); a full-wave rectifier (11) connected to output of the synchronus generator (3) for rectifying an alternating current wave of the output thereof; a main circuit of a direct current/alternating current power converter (13) (hereafter referred to as inverter) having switching elements and connectable to the output of the synchronous generator (3); a direct current power supply (15) for supplying the power to actuate the engine (1) and having a semiconductor device for preventing the current from flowing back, the direct current power supply (15) being connected to the main circuit of the inverter (13); a switching unit (12) composed of a first switch (12A) and a second switch (12B), the switch (12A) capable of connecting to the output of the main circuit of the inverter (13) for suppl ing the output thereof to a load while the switch (12B) capable of connecting the outputs of the main circuit of the inverter (13) with the output of the synchronous generator (3); and a control circuit (19) connectable to the direct current power supply (15) for switching the first and second switches (12A, 12B) and controlling the switching elements of the main circuit of the inverter (13).
Claim 2
Dependent Claim
239 words
An engine driven generator having no exclusive starter comprising: an engine (1); a synchronous generator (3) having a rotor and coupled to a shaft of the engine (1); a rotor position detector for detecting the position of the rotor of the synchronous generator (3); a full-wave rectifier (11) connected to output of the synchronus generator (3) for rectifying an alternating current wave of the output thereof; a main circuit of a direct current/alternating current power converter (13) (hereafter referred to as inverter) having switching elements and connectable to the output of the synchronous generator (3); a direct current power supply (15) for supplying the power to actuate the engine (1) and having a semiconductor device for preventing the current from flowing back, the direct current power supply (15) being connected to the main circuit of the inverter (13); a switching unit (12) composed of a first switch (12A) and a second switch (12B), the switch (12A) capable of connecting to the output of the main circuit of the inverter (13) for suppl ing the output thereof to a load while the switch (12B) capable of connecting the outputs of the main circuit of the inverter (13) with the output of the synchronous generator (3); and a control circuit (19) connectable to the direct current power supply (15) for switching the first and second switches (12A, 12B) and controlling the switching elements of the main circuit of the inverter (13).
Claim 3
Dependent Claim
41 words
(2) An engine driven generator according to Claim 1, wherein the first and the second switches (12A, 12B) are switched respectively at the time when a motor driving operation of the sysnchronous generator (3) is converted to the power generating operation.
Claim 4
Dependent Claim
140 words
(3) An engine driven generator according to Claim 1, wherein the direct current obtained by rectification of alternating current output of the synchronous generator (3) by the full-wave rectifier (11) is converted to the alternating current by the main circuit of the inverter (13) for producing a power generating output during the period when the switching unit (12) is switched to the first (12A) while the voltage or the current of the main circuit of the inverter (13) is controlled to be synchronous with the rotor position of the synchronous generator (3) by the rotor position detector (10) of the synchronous generator (3) and amplitude of the voltage or the current is adjusted to control the speed of rotation (N) of the synchronous generator (3) during the period when the switching unit (12) is switched to the second switch (12B).
Claim 5
Dependent Claim
183 words
(4) An engine driven generator comprising: an engine (1); a three-phase synchronous generator (3) driven by the engine (1); a direct current power supply (15) for actuating the engine (1); a direct current/alternating current power converter (13) (hereafter referred to as inverter ) for converting the direct current of the direct current power supply (15) into an alternating current to supply it to the three-phase synchronous genertor (3) so that the three-phase synchronous generator (3) performs motor driving operation to actuate the engine (1), the inverter (13) having switching elements connected with each other by bridge connection; characterized in that during the period when the three-phase synchronous generator (3) performs the power generating operation after completing the actuation of the engine (1), a pair of positive and negative first single-phase switching elements are subjected to successive ON/OFF control operation while one pair of two-phase switching elements and the other pair of two-phase switching elements are alternated for each half of the time and subjected to PWM control operation so that output terminals corresponding to the two-phase switching elements are short-circuited with each other.
Claim 6
Dependent Claim
183 words
(4) An engine driven generator comprising: an engine (1); a three-phase synchronous generator (3) driven by the engine (1); a direct current power supply (15) for actuating the engine (1); a direct current/alternating current power converter (13) (hereafter referred to as inverter ) for converting the direct current of the direct current power supply (15) into an alternating current to supply it to the three-phase synchronous genertor (3) so that the three-phase synchronous generator (3) performs motor driving operation to actuate the engine (1), the inverter (13) having switching elements connected with each other by bridge connection; characterized in that during the period when the three-phase synchronous generator (3) performs the power generating operation after completing the actuation of the engine (1), a pair of positive and negative first single-phase switching elements are subjected to successive ON/OFF control operation while one pair of two-phase switching elements and the other pair of two-phase switching elements are alternated for each half of the time and subjected to PWM control operation so that output terminals corresponding to the two-phase switching elements are short-circuited with each other.
Claim 7
Dependent Claim
56 words
(5) An engine driven generator according to Claim 4, wherein the pair of positive and negative first single-phase switching elements are driven by a square wave signal while the other each pair of two-phase switching elements are driven by a PWM signal which is a half wave of a sine wave is alternated each half cycle.
Claim 8
Dependent Claim
58 words
(6) An engine driven generator according to Claims 1 through 5, wherein a direct current power supply (15) for actuating the engine (1) is a battery interposed between the direct current terminals of the main circuit of the inverter (13) via the switching element (17), the switching element (17) is not turned on during the engine is actuated.
Claim 9
Dependent Claim
31 words
(7) An engine driven generator according to Claims 1 through 6, wherein the direct curent power supply (15) comprises a battery and a chopper for increasing the voltage of the battery.
Claim 10
Dependent Claim
33 words
(8) An engine driven generator according to Claims 1 through 6, wherein the direct current power supply (15) comprises a battery and a chopper for increasing and decreasing the voltage of the battery.
References Cited (Backward Citations)
No citation records indexed.
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