Circuit arrangement for electrically driven motor vehicles

• US 4,170,748 A
• Filed: 08/01/1978
• Issued: 10/09/1979
• Est. Priority Date: 08/09/1977
• Status: Expired due to Term

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Kapfhammer, Karl
• Primary Examiner(s): Smith, Jr., David
• Application Number:
  US05/929,958
• Time in Patent Office: 434 Days
• Field of Search: 318/139, 320/3, 320/15, 320/19, 307/48, 307/49, 307/75
• US Class Current: 318/139
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2220/20 DC electrical machines
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y10S 320/19 Charger status, e.g. voltmeter

Abstract

A circuit arrangement for electrically driven motor vehicles with an electric driving motor which is fed from a driving battery, with a transformer which is adapted to be connected on the primary side to an A.C. power supply network and on the secondary side by way of a rectifier arrangement to the driving battery, and with a D.C. converter which includes a chopper, an A.C. voltage step-down device and a rectifier and which recharges a power supply battery having a rated voltage that is lower than that of the driving battery, from the driving battery; the transformer thereby forms the A.C. step-down device, to one side of which the driving battery is connected by way of the chopper and to the other side of which the power supply battery having a correspondingly matched stepped-down ratio is connected by way of the rectifier.

Claims

1. A circuit arrangement for electrically driven motor vehicles, comprising an electric motor fed from a driving battery means, a transformer means having a primary side and a secondary side, the primary side being adapted to be connected to an A.C. power supply network and the secondary side being adapted to be connected to the driving battery means by way of rectifier means, and a D.C. converter means including a vibrator means, an A.C. voltage step-down means and rectifier means, the D.C. converter means being operable to recharge a power supply battery means having a rated voltage lower in comparison to that of the driving battery means, from the driving battery means, characterized in that the transformer means forms the A.C. voltage step-down means, the driving battery means being operatively connected to one side of the transformer means by way of the vibrator means and the power supply battery means having a correspondingly matched stepped-down ratio being operatively connected to the other side of the transformer means by way of the rectifier means.

2. A circuit arrangement according to claim 1, characterized in that said one side is the primary side and the other side is the secondary side of the transformer means.

3. A circuit arrangement according to claim 1, characterized in that the vibrator means is a single-acting chopper.

4. A circuit arrangement according to claim 1, 2 or 3, characterized in that the rectifier means is a bridge rectifier.

5. A circuit arrangement according to claim 1, characterized in that the driving battery means is connected by way of the vibrator means to the primary side and the power supply battery means is connected to the secondary side of the transformer means by way of the rectifier means.

6. A circuit arrangement according to claim 1, characterized in that the driving battery means is connected by way of the vibrator means to the secondary side of the transformer means and the power supply battery means is connected to the primary side of the transformer by way of the rectifier means.

7. A circuit arrangement according to claim 6, characterized in that the vibrator means is a push-pull chopper.

8. A circuit arrangement according to claim 5, 6 or 7, characterized in that the rectifier means is adapted to be connected alternately as rectifier means between the secondary side of the transformer means and the driving battery means and as rectifier means between the primary side or the secondary side of the transformer means and the power supply battery means.