Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
  • H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
  • H02P9/48—Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle

Definitions

• the invention is based on a method for regulating a generator, in particular a claw-pole generator that can be driven by an internal combustion engine, according to the preamble of the main claim.
• Claw pole generators used. Such three-phase generators are connected to the vehicle's DC voltage network via a diode rectifier bridge. The power output of a generator begins as soon as its induced voltage exceeds the mains voltage. The power output of the generator is regulated via the strength of the excitation current. The mains voltage or the output voltage of the generator is usually used as the control variable for this.
• the idle speed of the engine is kept as low as possible in newer motor vehicles.
• a low engine speed also affects the generator speed because the generator is driven by the engine. So that the generator even when the Motors can still supply sufficient electrical energy to the on-board electrical system and the battery can be recharged, the generator must make the request to deliver energy even at low generator speeds. Furthermore, the generator should deliver as much energy as possible at normal speeds.
• Optimal generator control should therefore, on the one hand, enable a general increase in performance and, on the other hand, a decrease in the starting speed, that is to say a decrease in the speed from which the generator can deliver power.
• a three-phase generator for a motor vehicle which delivers an improved output power compared to conventional generators, is known from EP 0 762 596 AI.
• this three-phase generator has a full-wave controlled rectifier bridge which comprises six controlled switches.
• a phase control can be carried out in which the switches of the bridge, which e.g. include switchable semiconductor elements, a phase control can be carried out in which the switches of the bridge, which e.g. include switchable semiconductor elements, a phase control can be carried out in which the
• Phase voltages of the generator are shifted relative to the phase currents.
• additional currents flow in the stator windings, which lead to an increase in the output power of the three-phase generator compared to a three-phase generator with a simple diode bridge.
• Generator with the features of claim 1 has the advantage that the generator delivers a higher output and that it delivers a higher output especially at low speeds. It is particularly advantageous that the so-called starting speed of the generator, that is Speed, from which a power output is even possible, is reduced compared to conventional generators.
• This method can be used because the generator is assigned a converter bridge with switching elements instead of conventional diodes. By properly controlling these switching elements, it is possible to connect the generator terminals to the positive or negative pole of the battery regardless of the natural ignition timing of a diode bridge. By suitably controlling the switching elements, additional currents can be impressed into the generator terminals and the output of the generator can be increased. These additional currents are initially from the battery or, if applicable, from one
• FIG. 1 shows the components of a generator that are essential to the invention, for example a claw-pole generator 10 with a converter bridge 11 and the load 12.
• the three stator windings 13, the excitation winding 14 and the excitation current Ierr are indicated symbolically by the claw-pole generator 10.
• the converter bridge 11 comprises the switching elements 15 to 20, which are connected to the stator windings 13 of the claw-pole generator 10 in the usual manner as in the case of a diode bridge.
• the switching elements 15 to 20 are connected to a capacitor 21, from which the mains voltage UNetz can be tapped, which can be supplied to the load 12.
• a battery 21a e.g. the on-board electrical system battery can replace the capacitor. Only a variable resistor 22 and a switch 23 of the load 12 are shown symbolically.
• the inventive method for controlling the generator can be carried out. Additional currents can be impressed into the generator terminals by suitable control of the switching elements 15 to 20.
• the switching elements 15 to 20 act as flow valves and are also referred to below
• Valves Valves.
• an additional current pulse is impressed during an otherwise currentless period.
• These current pulses lead to the generator inductance being charged with magnetic energy.
• the generator is additionally supplied with inductive reactive power, which corresponds to an additional magnetizing current.
• the power output of the generator can be increased compared to pure diode operation by the An additional magnetizing current is offered to stator windings.
• the phase during which the switching elements 15 to 20 of the converter bridge 11 are conductive is then shifted overall. There is a phase shift between the generator voltage and the
• the machine consumes reactive power. This means that as soon as the phase current in one of the stator windings has a zero crossing and commutation would take place during diode operation, the commutation is delayed by appropriate activation of the switching element or elements.
• the closed switching element ensures a further connection to the battery.
• the switch-on time and the longest switch-on time of a switching element or a switch is determined by logistics for the valve release. This time corresponds to the otherwise currentless time range of a string.
• the regulation of the level of the output voltage of the generator takes place in the usual way by means of a voltage regulator which, for example, is part of the claw-pole generator designated by 10 in FIG. 1 and regulates the excitation current in such a way that a predeterminable voltage level results. 1. Control of the switch currents
• FIG. 2 shows a control circuit for a switch or a switching element (valve) with which the
• the currents through the switching elements are detected and used for the regulation.
• the current I is detected by the switching element 15 with the aid of a suitable current detection 24 and as an actual current value
• the control circuit according to FIG. 2 further comprises an AND gate 26 and a logistics for the valve release 27, the AND gate 26 linking the outputs of the comparator 25 and the logistics for the valve release 27 to one another.
• the higher-level voltage control or power control of the generator is carried out with the control circuit shown in FIG. 2, a maximum value for the switch currents being released. If the actual current of the switch concerned exceeds this default value, the valve is switched off. The current commutates into the complementary diode of the bridge branch.
• FIG. 4 shows a further control circuit for a switching element or valve, with which control of the direct current IG can be carried out.
• the direct current that is to say the output current of the generator
• the control circuit shown in FIG. 4 corresponds to the circuit according to FIG. 2, but it is not the valve current I but the direct current IG of the generator which is used as the basis for the control.
• a combined regulation via the direct current and the switch currents can also be implemented.
• the valve currents can also be derived from the measured direct current.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Control Of Eletrric Generators (AREA)
• Control Of Charge By Means Of Generators (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7885627

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (3)

• 1998
  • 1998-10-26 DE DE19849239A patent/DE19849239A1/de not_active Ceased
• 1999
  • 1999-10-01 BR BR9907060-0A patent/BR9907060A/pt not_active IP Right Cessation
  • 1999-10-01 KR KR1020007007057A patent/KR20010033548A/ko not_active Application Discontinuation
  • 1999-10-01 EP EP99955829A patent/EP1051789A2/de not_active Withdrawn
  • 1999-10-01 JP JP2000578891A patent/JP2002529041A/ja active Pending
  • 1999-10-01 WO PCT/DE1999/003160 patent/WO2000025408A2/de not_active Application Discontinuation

Non-Patent Citations (1)

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