Control circuit for predominantly inductive loads in particular electroinjectors
First Claim
1. In a combination of a control circuit (100) and a predominantly inductive load said control circuit being for supplying said load with current (Ii) having a high-amplitude portion with a rapid leading edge and a lower-amplitude portion said circuit (100), the improved combination comprising:
- first and second input terminals (102,
103) for connection to a voltage source (B);
an energy storage circuit (106) connected between said first and second input terminals and comprising an inductive element (Li) of said load and a capacitive element (Ci);
a first controlled switch element (SWi) connected between said inductive element and a reference line (105) for enabling selective charging of said inductive element;
a second controlled switch element (SWR) connected for enabling rapid discharge of said capacitive element into said load;
a control unit (12) for generating control signals (si, s1) respectively for said first and second switch elements (SWi, SWR);
means (12) for closing said first and second switch elements (SWi, SWR) when said capacitive element (Ci) is charged, and rapidly discharging said capacitive element into said load (Li);
means for consecutively opening and closing said first switch element (SWi) when said second switch element (SWR) is closed, and producing small current pulses in said load with no energy transfer between said load and said capacitive element; and
means for consecutively opening and closing said first switch element (SWi) when said second switch element (SWR) is open, for producing small current pulses in said load and subsequently transferring energy from said load to said capacitive element.
3 Assignments
0 Petitions
Accused Products
Abstract
A control circuit for supplying a load with current having a high-amplitudeortion with a rapid leading edge, and a lower-amplitude portion. The circuit is input-connected to a low-voltage supply source, and comprises a number of actuator circuits parallel-connected between the input terminals and each including a capacitor and a load. Each actuator circuit also comprises a first controlled switch between the respective load and a reference line, for enabling energy supply and storage by the respective load. A second controlled switch is provided between the capacitor line and the load line, for rapidly discharging the capacitors into the load selected by the first switch and recirculating the load current, or for charging the capacitors with the recirculated load current.
40 Citations
12 Claims
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1. In a combination of a control circuit (100) and a predominantly inductive load said control circuit being for supplying said load with current (Ii) having a high-amplitude portion with a rapid leading edge and a lower-amplitude portion said circuit (100), the improved combination comprising:
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first and second input terminals (102,
103) for connection to a voltage source (B);an energy storage circuit (106) connected between said first and second input terminals and comprising an inductive element (Li) of said load and a capacitive element (Ci); a first controlled switch element (SWi) connected between said inductive element and a reference line (105) for enabling selective charging of said inductive element; a second controlled switch element (SWR) connected for enabling rapid discharge of said capacitive element into said load; a control unit (12) for generating control signals (si, s1) respectively for said first and second switch elements (SWi, SWR); means (12) for closing said first and second switch elements (SWi, SWR) when said capacitive element (Ci) is charged, and rapidly discharging said capacitive element into said load (Li); means for consecutively opening and closing said first switch element (SWi) when said second switch element (SWR) is closed, and producing small current pulses in said load with no energy transfer between said load and said capacitive element; and means for consecutively opening and closing said first switch element (SWi) when said second switch element (SWR) is open, for producing small current pulses in said load and subsequently transferring energy from said load to said capacitive element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a combination of a control circuit (100) and a predominantly inductive load said control circuit being for supplying said load with current (Ii) having a high-amplitude portion with a rapid leading edge and a lower-amplitude portion said circuit (100), wherein said load comprises an electroinjector actuator, the improved combination comprising:
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first and second input terminals (102,
103) for connection to a voltage source (B);an energy storage circuit (106) connected between said first and second input terminals and comprising an inductive element (Li) of said load and a capacitive element (Ci); a first controlled switch element (SWi) connected between said inductive element and a reference line (105) for enabling selective charging of said inductive element; a second controlled switch element (SWR) connected for enabling rapid discharge of said capacitive element into said load; a control unit (12) for generating control signals (si, s1) respectively for said first and second switch elements (SWi, SWR); means (12) for closing said first and second switch elements (SWi, SWR) when said capacitive element (Ci) is charged, and rapidly discharging said capacitive element into said load (Li); and means for consecutively opening said first and second switch elements (SWi, SWR), and rapidly discharging said load (Li) into said capacitive element (Ci). - View Dependent Claims (9, 10, 11, 12)
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Specification