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
  • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
  • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
  • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
  • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
  • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
  • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
  • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation

Definitions

• the invention relates to a method for controlling at least two electrical consumers with the features mentioned in the preamble of claim 1.
• electrical loads can be controlled with a pulse width modulated signal.
• the electrical consumers are connected to a voltage source or separated from the voltage source.
• a current flows as a result of an input inductance of the electrical connecting lines between the voltage source and the electrical consumers.
• this current is absorbed by means of a buffer capacity.
• the method according to the invention with the features mentioned in claim 1 offers the advantage that the effective capacitor current of the buffer capacitance is reduced. Because the pulse-width-modulated signals for controlling the at least two electrical consumers are generated at different times, the effective pulse pauses are reduced, so that the maximum capacitor current of the buffer capacitance is reduced accordingly. As a result of the low capacitor current, the buffer capacity can comparable boundary conditions, such as temperature and life, are greatly reduced, so that there are cost advantages.
• the pulse-width-modulated signals are generated at different times in relation to one another in such a way that a simultaneous pulse pause of all pulse-width-modulated signals does not occur when the pulse-width-modulated signals are superimposed. This ensures that the effective value of the capacitor current of the buffer capacitance results continuously from a supply current into the capacitor and a supply current from the capacitor, so that the effective maximum value is reduced.
• Figure 1 shows a circuit arrangement
• Figure 2 shows an effective capacitor current depending on a duty cycle pulse-width modulated signals. Description of the embodiment
• the electrical loads 12 and 14 can be, for example, two phases of a clocked, multi-phase DC motor, as is used, for example, in motor vehicle technology.
• the electrical consumers 12 and 14 are each connected via a switching means 16 or 18 to a voltage source 20, in motor vehicles generally the vehicle battery.
• a line network 22 is laid, which has a line inductance L shown here as an equivalent circuit symbol.
• a buffer capacitance C is connected in parallel with the voltage source 20 and the electrical consumers 12 and 14.
• the switching means 16 and 18 can be controlled via a control device 24 with pulse-width-modulated signals. In accordance with the respective pulse-width-modulated signal, the switching means 16 and 18 close or open them. When the switching means 16 and 18 are closed, the electrical consumers 12 and 14 are connected to the voltage source 20, so that a load current flows. When the switching means 16 and 18 are open, a feed current that flows into the buffer capacitance C flows between the voltage source 20 and the electrical consumers 12 and 14, which are separate from the voltage source 20, due to the input inductance L of the line network 22.
• the buffer capacitance C is discharged by means of a supply current which corresponds to a difference between the total load current and the supply current into the buffer capacitance C.
• a certain effective current for the buffer capacitance C is thus set in accordance with the position of the switching means 16 and 18.
• the course of the effective value of the current I according to the prior art is shown in a first characteristic curve as it arises when the switching means 16 and 18 are triggered with a pulse-width-modulated signal, that is, the switching means 16 and 18 open or close at the same time.
• a further characteristic curve for the course of the effective value of the current I is entered at 28, in which the electrical consumers 12 and 14 are triggered with a time-delay with a pulse-width-modulated signal with the same pulse duty factor, that is, close or in accordance with the pulse duty factor open the switching means 16 and 18 at different times.
• the buffer capacitance C can be dimensioned correspondingly smaller.
• the third characteristic curve 30 shows the course of the entire load current with electrical consumers 12 and 14 switched according to the duty cycle.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Dc-Dc Converters (AREA)
• Electronic Switches (AREA)
• Relay Circuits (AREA)
• Inverter Devices (AREA)
• Selective Calling Equipment (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7832812

Family Applications (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (2)

• 1997
  • 1997-06-18 DE DE19725708A patent/DE19725708A1/de not_active Ceased
• 1998
  • 1998-06-16 EP EP98936170A patent/EP0990303A1/de not_active Withdrawn
  • 1998-06-16 BR BR9810694-5A patent/BR9810694A/pt not_active Application Discontinuation
  • 1998-06-16 JP JP50356399A patent/JP2002504299A/ja active Pending
  • 1998-06-16 KR KR1019997011780A patent/KR20010013765A/ko not_active Application Discontinuation
  • 1998-06-16 WO PCT/DE1998/001624 patent/WO1998058445A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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