US 10,002,699 B2Granted

Electromagnetic coil driving control device

AssigneeHitachi Automotive Systems, Ltd.

InventorsKiyoshi Aiki, Ayumu Hatanaka, Takuya Mayuzumi, Katsuya Oyama, Ryosuke Ishida, Yasushi Sugiyama

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Abstract

The present invention is to provide a magnet coil drive control device that can efficiently suppress conduction noise while reducing the capacitance of a capacitor. A capacitor and an impedance element are arranged in series on the connecting line connecting the positive electrode line and the negative electrode line of a DC power supply, the connecting line between the capacitor and the impedance element is connected to one end of a magnet coil via a freewheeling diode, and the portion between the freewheeling diode and the one end of the magnet coil is connected to the positive electrode line or the negative electrode line by a switching element. Conduction noise caused by the driving current of the magnet coil can be suppressed by the impedance element, and the capacitance of the capacitor can be further reduced. Accordingly, the magnet coil drive control device can be made smaller in size.

Claims6

Dependent claims

A magnet coil drive control device comprising:

a first magnet coil having one end connected to a positive electrode side of a DC power supply;
a second magnet coil having one end connected to the positive electrode side of the DC power supply;
an impedance element;
a capacitor connected in series to the impedance element;
a first circuit that is connected to the impedance element and to the capacitor;
and
a second circuit connected in parallel to the first circuit, wherein
the first circuit includes
a switching element configured to turn on and off current flowing into the first magnet coil, the switching element being directly connected to the other end of the first magnet coil;
and
a freewheeling diode configured to cause electrical energy accumulated in the first magnet coil to freewheel as a freewheeling current when the switching element is in an off-state,
the second circuit includes
another switching element configured to turn on and off current flowing into the second magnet coil, the another switching element being directly connected to the other end of the second magnet coil;
and
another freewheeling diode configured to cause electrical energy accumulated in the second magnet coil to freewheel as a freewheeling current when the another switching element is in an off-state,
the capacitor and the impedance element are arranged on a connecting line directly connecting a positive electrode line and a negative electrode line of the DC power supply,
the connecting line between the capacitor and the impedance element is connected to the other end of the first magnet coil via the freewheeling diode and is connected to the other end of the second magnet coil via the another freewheeling diode,
a connecting line between the freewheeling diode and the other end of the first magnet coil is further connected to one of the positive electrode line and the negative electrode line by a connecting line having the switching element thereon,
a connecting line between the another freewheeling diode and the other end of the second magnet coil is further connected to one of the positive electrode line and the negative electrode line by a connecting line having the another switching element thereon, and
the impedance element and the capacitor are shared between the first circuit and the second circuit.

17 more elements

A magnet coil drive control device comprising:

a first magnet coil having one end connected to a positive electrode side of a DC power supply;
a second magnet coil having one end connected to the positive electrode side of the DC power supply;
an impedance element;
a capacitor connected in series to the impedance element;
a first circuit that is connected to the impedance element and to the capacitor, and a second circuit connected in parallel to the first circuit, wherein
the first circuit includes
a switching element configured to turn on and off current flowing into the first magnet coil, the switching element being directly connected to the other end of the first magnet coil;
and
a freewheeling diode configured to cause electrical energy accumulated in the first magnet coil to freewheel as a freewheeling current when the switching element is in an off-state,
the second circuit includes
another switching element configured to turn on and off current flowing into the second magnet coil, the another switching element being directly connected to the other end of the second magnet coil;
and
another freewheeling diode configured to cause electrical energy accumulated in the second magnet coil to freewheel as a freewheeling current when the another switching element is in an off-state,
the impedance element and the capacitor are provided on a connecting line directly connecting a positive electrode line and a negative electrode line of the DC power supply, the impedance element and the capacitor being arranged in a direction from the positive electrode line toward the negative electrode line,
the connecting line between the impedance element and the capacitor is connected to the other end of the first magnet coil via the freewheeling diode and is connected to the other end of the second magnet coil via the another freewheeling diode, to cause the freewheeling current to flow into the impedance element and the capacitor,
a connecting line between an anode side of the freewheeling diode and the other end of the first magnet coil is further connected to the negative electrode line by a connecting line having the switching element thereon, the switching element being a low-side switching element, and
a connecting line between an anode side of the another freewheeling diode and the other end of the second magnet coil is further connected to the negative electrode line by a connecting line having the another switching element thereon, the another switching element being another low-side switching element, and
the impedance element and the capacitor are shared between the first circuit and the second circuit.

15 more elements

A magnet coil drive control device comprising:

a first magnet coil having one end connected to a positive electrode side of a DC power supply;
a second magnet coil having one end connected to the positive electrode side of the DC power supply;
an impedance element;
a capacitor connected in series to the impedance element;
a first circuit that is connected to the impedance element and to the capacitor;
and
a second circuit connected in parallel to the first circuit, wherein
the first circuit includes
a switching element configured to turn on and off current flowing into the first magnet coil, the switching element being directly connected to the other end of the first magnet coil;
and
a freewheeling diode configured to cause electrical energy accumulated in the first magnet coil to freewheel as a freewheeling current when the switching element is in an off-state,
the second circuit includes
another switching element configured to turn on and off current flowing into the second magnet cod, the another switching element being directly connected to the other end of the second magnet coil;
and
another freewheeling diode configured to cause electrical energy accumulated in the second magnet coil to freewheel as a freewheeling current when the another switching element is in an off-state,
the capacitor and the impedance element are provided on a connecting line directly connecting a positive electrode line and a negative electrode line of the DC power supply, the capacitor and the impedance element being arranged in a direction from the positive electrode line toward the negative electrode line,
the connecting line between the capacitor and the impedance element is connected to the other end of the first magnet coil via the freewheeling diode, to cause the freewheeling current to flow toward the first magnet coil,
the connecting line between the capacitor and the impedance element is connected to the other end of the second magnet coil via the another freewheeling diode, to cause the freewheeling current to flow toward the second magnet coil,
a connecting line between a cathode side of the freewheeling diode and the other end of the first magnet coil is further connected to the positive electrode line by a connecting line having the switching element thereon, the switching element being a high-side switching element,
a connecting line between a cathode side of the another freewheeling diode and the other end of the second magnet coil is further connected to the positive electrode line by a connecting line having the another switching element thereon, the another switching element being another high-side switching element,
the impedance element and the capacitor are shared between the first circuit and the second circuit.

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/785,528Filed 25 Apr 2013
Published: US 2016/0071642 A110 Mar 2016
Granted: 19 Jun 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H01F 7/204
Electromagnets for high magnetic field strength: circuits for energising or de-energising
F02D 41/20
Electrical control of supply of combustible mixture or its constituents: output circuits, e.g. for controlling currents in command coils
H02M 1/44
Details of apparatus for conversion: circuits or arrangements for compensating for electromagnetic interference in converters or inverters
H02M 3/155
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only