US5034669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative circuit for motor drive system having leakage current compensation
Assignee: Mitsubishi Electric Corp
•
Filing: 1990-06-18
•
Granted: 1991-07-23
•
Expires: 2010-06-18
Abstract
Abstract A regenerative control circuit for controlling the regenerative energy of an electric motor drive system includes a regenerative energy dissipating resistor connected in parallel to a main smoothing capacitor through a switching element, a comparator connected to the switching element and adapted to produce an output signal to drive the switching element, a regenerative reference voltage rectifying circuit connected to a 3-phase a.c. power source, a regenerative reference voltage smoothing capacitor connected to the output of the regenerative reference voltage rectifying circuit, and a regenerative circuit including a regeneration transistor for entering a voltage difference, which is created between the main smoothing capacitor and the regenerative reference voltage smoothing capacitor by regenerative energy in certain circumstance, to the comparator. The circuit operates to control the regenerative energy, while maintaining the voltage of the main smoothing capacitor constant.
Inventors
- 👤 Akira Sako
- 👤 Yoji Tsutsumishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:04
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02P; H02P23/00; H02P23/06; H02P23/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A regenerative control circuit for an electric motor drive system which includes a rectifying circuit connected to a 3-phase a.c. power source, a main smoothing capacitor connected to the output of said rectifying circuit, and an inverter having an input thereof connected to said main smoothing capacitor and an output thereof connected to an electric motor, said regenerative control circuit comprising: regenerative energy dissipating means connected in parallel to said main smoothing capacitor through a switching element; a comparator connected to said switching element and adapted to produce an output signal to drive said switching element; a regenerative reference voltage rectifying circuit connected to said 3-phase a.c. power source and adapted to produce a regenerative reference voltage; a regenerative reference voltage smoothing capacitor connected to the output of said regenerative reference voltage rectifying circuit; and a regenerative circuit including a regeneration transistor for inputting a voltage difference which is created between said main smoothing capacitor and said regenerative reference voltage smoothing capacitor by regenerative leakage current energy, to said comparator after biasing said voltage difference.
Claim 2
Dependent Claim
175 words
A regenerative control circuit for an electric motor drive system which includes a rectifying circuit connected to a 3-phase a.c. power source, a main smoothing capacitor connected to the output of said rectifying circuit, and an inverter having an input thereof connected to said main smoothing capacitor and an output thereof connected to an electric motor, said regenerative control circuit comprising: regenerative energy dissipating means connected in parallel to said main smoothing capacitor through a switching element; a comparator connected to said switching element and adapted to produce an output signal to drive said switching element; a regenerative reference voltage rectifying circuit connected to said 3-phase a.c. power source and adapted to produce a regenerative reference voltage; a regenerative reference voltage smoothing capacitor connected to the output of said regenerative reference voltage rectifying circuit; and a regenerative circuit including a regeneration transistor for inputting a voltage difference which is created between said main smoothing capacitor and said regenerative reference voltage smoothing capacitor by regenerative leakage current energy, to said comparator after biasing said voltage difference.
Claim 3
Dependent Claim
17 words
A regenerative control circuit according to claim 1, wherein said regenerative energy dissipating means comprises a resistor.
Claim 4
Dependent Claim
20 words
A regenerative control circuit according to claim 1, wherein said regenerative reference voltage rectifying circuit is formed of six diodes.
Claim 5
Dependent Claim
15 words
A regenerative control circuit according to claim 1, wherein said switching element comprises a transistor.
Claim 6
Dependent Claim
94 words
A regenerative control circuit for an electric motor drive system, comprising: regenerative energy dissipating means for dissipating excess regenerative energy connected in parallel to a main smoothing capacitor of said electric motor drive system through a switching element; comparator means for developing a switching element drive signal for driving said switching element; means for developing a regenerative reference voltage; a regenerative circuit for biasing a voltage difference between said main smoothing capacitor and said regenerative reference voltage means and applying said voltage difference to said comparator means to develop said switching element drive signal.
Claim 7
Dependent Claim
94 words
A regenerative control circuit for an electric motor drive system, comprising: regenerative energy dissipating means for dissipating excess regenerative energy connected in parallel to a main smoothing capacitor of said electric motor drive system through a switching element; comparator means for developing a switching element drive signal for driving said switching element; means for developing a regenerative reference voltage; a regenerative circuit for biasing a voltage difference between said main smoothing capacitor and said regenerative reference voltage means and applying said voltage difference to said comparator means to develop said switching element drive signal.
Claim 8
Dependent Claim
46 words
A regenerative control circuit for a motor drive system according to claim 5, wherein said regenerative circuit comprises: a transistor having an emitter connected to said main smoothing capacitor, a collector connected to said comparator means, and a base connected to said regenerative reference voltage means.
References Cited (Backward Citations)
US4039914A
Cited
US4434393A
Cited
US4545464A
Cited
US4521724A
Cited
JPS6062823A
Cited
US4620272A
Cited
US4667776A
Cited
JPS6225883A
Cited
US4823066A
Cited
US4761600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |