KR102345445B1 - The field current supplying apparatus and method of the motor - Google Patents

Abstract

A field current supply device according to an embodiment of the present invention relates to a field current supply device in an electric motor system of a mild hybrid vehicle, comprising: a first battery and a second battery supplying current to a field; first and second switches connected in series between the positive and negative terminals of the first battery; and a third switch and a fourth switch connected in series between the positive terminal and the negative terminal of the second battery, wherein both ends of the field are a first node formed between the first switch and the second switch and a second node formed between the third switch and the fourth switch, respectively.

Description

FIELD CURRENT SUPPLYING APPARATUS AND METHOD OF THE MOTOR

The present invention relates to an apparatus and method for supplying a field current to an electric motor including a field in a rotor, and more particularly, to an apparatus and method for supplying a field current in an electric motor system of a mild hybrid vehicle to be.

In the case of an electric motor including a field in the rotor (Wound Rotor Synchronous Machine, Wound Field Synchronous Machine, Claw-pole Machine), output cannot be obtained unless current is supplied to the field. Accordingly, there is a need for a device for supplying a current to a field, and such a device for supplying a field current is generally electrically connected to one battery and a field as shown in FIG. It is composed of a plurality of switch elements to control the flow of current flowing through the Such a switch element may be formed of a semiconductor element such as a MOS-FET, or may be replaced with a diode.

However, in the case of the field current supply device of FIG. 1, since the field receives current from one battery, the state of charge (SOC) of the battery is low or when a problem occurs in some of the plurality of switch elements, the field There is a problem in that it is difficult to stably supply current to the

The following prior documents relate to a battery protection circuit and a protection method of a hybrid motor controller, and do not disclose the technical gist of the present invention.

Korean Patent Publication No. 10-2007-0074683

A field current supply apparatus and a field current supply method according to an embodiment of the present invention have the following object in order to solve the above-described problems.

It is to propose a field current supply device and a field current supply method capable of improving system stability and system efficiency by using two batteries employed in a mild hybrid vehicle.

The problems to be solved of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

A field current supply device according to an embodiment of the present invention relates to a field current supply device in an electric motor system of a mild hybrid vehicle, comprising: a first battery and a second battery supplying current to a field; first and second switches connected in series between the positive and negative terminals of the first battery; and a third switch and a fourth switch connected in series between the positive terminal and the negative terminal of the second battery, wherein both ends of the field are a first node formed between the first switch and the second switch and a second node formed between the third switch and the fourth switch, respectively.

Preferably, at least one of the first to fourth switches is controlled based on the states of the first battery and the second battery.

When the charging rule of the first battery is equal to or greater than a preset value, it is preferable that the first switch and the fourth switch are controlled to be on, and the second switch and the third switch are controlled to be off. .

Preferably, when the charge rate of the first battery is less than a preset value, the first switch and the fourth switch are controlled to be off, and the second switch and the third switch are controlled to be on. .

Preferably, at least one of the first to fourth switches is controlled based on a failure state of the first to fourth switches.

A method of supplying a field current according to an embodiment of the present invention relates to a method of supplying a field current in an electric motor system of a mild hybrid vehicle, wherein at least one of a first battery and a second battery connected to supply power to the field A first step of checking the state of charge; a second step of determining whether a switch for controlling the flow of current between the first battery and the field and a switch for controlling the flow of current between the second battery and the field are faulty; and a third step in which the field is supplied with current from one of the first battery and the second battery based on the determination result in the second step.

The switch includes a first switch and a second switch connected in series between a positive terminal and a negative terminal of the first battery, and a third switch connected in series between a positive terminal and a negative terminal of the second battery. and a fourth switch, wherein both ends of the field are respectively connected to a first node formed between the first switch and the second switch and a second node formed between the third switch and the fourth switch, and the second In the step, it is preferable to determine whether at least one of the first switch to the fourth switch is faulty.

When it is confirmed in the first step that the charge amount of the first battery is equal to or greater than a preset value, and it is determined in the second step that the first switch and the fourth switch are not faulty, the field causes the first battery to fail. It is preferable to be supplied with current through the

In the first step, it is confirmed that the charge amount of the first battery is equal to or greater than a preset value, and in the second step, it is determined that at least one of the first switch and the fourth switch is faulty, and the second switch and the second switch When it is determined that the switch 3 is not faulty, the field is preferably supplied with current through the second battery.

When it is confirmed in the first step that the charge amount of the first battery is less than a preset value, and it is determined in the second step that the second switch and the third switch are not malfunctioning, the field It is preferable to be supplied with current through the

The field current supply apparatus and the field current supply method according to an embodiment of the present invention can selectively supply current to a field by two batteries employed in a mild hybrid vehicle based on a state of charge of the battery and whether a switch element is faulty. By doing so, the effect of promoting system stability and system efficiency can be expected.

Effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

1 is a circuit diagram showing a conventional field current supply device.
2 is a circuit diagram illustrating a field current supply device according to an embodiment of the present invention.
3 and 4 are circuit diagrams showing the flow of current according to the on/off of the switch in the field current supply device according to an embodiment of the present invention.
5 is a flowchart illustrating a method for supplying a field current in time series according to an embodiment of the present invention.

A preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

Hereinafter, a field current supply device according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4 . 2 is a circuit diagram illustrating a field current supply device according to an embodiment of the present invention. 3 and 4 are circuit diagrams showing the flow of current according to the on/off of the switch in the field current supply device according to an embodiment of the present invention.

A field current supply device according to an embodiment of the present invention relates to a field current supply device applied to an electric motor system of a mild hybrid vehicle, and as shown in FIG. 1 , a first battery 200, a second battery ( 300), and the first to fourth switches 410, 420, 430, and 440 are configured to include.

In the case of a mild hybrid vehicle, a high-voltage battery electrically connected via a motor-generator and an inverter and a low-voltage battery electrically connected via a high-voltage battery and a converter to supply power to a load are generally employed. Accordingly, the present invention relates to a field current supply device in a mild hybrid vehicle in which two batteries are generally employed, wherein the first battery 200 and the second battery 300 are a high voltage battery and a low voltage battery in a mild hybrid system. It can be said that it corresponds to the battery, and the first battery 200 and the second battery 300 perform a function of supplying current to the field 100 .

The first switch 410 to the fourth switch 440 are configured to control the flow of current between the first battery 200 or the second battery 300 and the magnetic field 100 . Specifically, the first switch 410 and the second switch 420 are connected in series between the positive terminal and the negative terminal of the first battery 200 , and the third switch 430 and the fourth switch 440 are connected in series. is connected in series between the positive terminal and the negative terminal of the second battery 300 . The switch 400 is preferably employed as a switch composed of a relay device or a semiconductor device such as a MOS-FET.

The field 100 includes a first node 510 formed between the first switch 410 and the second switch 420 and a second node 520 formed between the third switch 430 and the fourth switch 440 . are configured to be connected to each other.

On the other hand, the on/off state of the first switch 410 to the fourth switch 440 may be controlled based on the states of the first battery 200 and the second battery 300, Alternatively, it may be controlled based on whether the first switch 410 to the fourth switch 440 fail. In this case, the flow of current applied to the field 100 will be described in detail with reference to FIGS. 3 and 4 below. let me explain

As described above, the first switch 410 to the fourth switch 440 may be controlled based on the charging state of the first battery 200 or the second battery 300, for example, the first battery 200 ) when the charge rate (SOC, State of Charge) is greater than or equal to the preset value (X), the electronic control unit (ECU) turns on the first switch 410 and the fourth switch 440 and the second switch 420 and the third switch 430 are turned off. In this case, as shown in FIG. 3 , the field 100 is supplied with current by the first battery 200 . On the other hand, when the charge rate of the first battery 200 is less than the preset value (X), the electronic control unit turns on the second switch 420 and the third switch 430, and the first switch 410 ) and the fourth switch 440 are turned off, and in this case, as shown in FIG. 4 , the field 100 is supplied with current by the second battery 300 . As described above, since the field 100 can receive current selectively based on the charging rates of the two batteries, it is possible to efficiently manage the overall power of the vehicle.

In addition, as described above, even when a failure occurs in any one of the plurality of switches 400 , it is possible to selectively supply current to the field 100 , specifically, the first switch 410 or the fourth switch 440 . ), when it is determined that at least one of them is faulty, the electronic control unit turns off both the first switch 410 and the fourth switch 440, and turns off the second switch 420 and the third switch 430. By turning them all on, the second battery 300 supplies current to the field 100 as shown in FIG. 4 . Conversely, when it is determined that at least one of the second switch 420 or the third switch 430 is faulty, the electronic control unit turns on both the first switch 410 and the fourth switch 440, By turning off both the second switch 420 and the third switch 430 , the first battery 200 supplies current to the field 100 as shown in FIG. 3 . Through this control, even when a failure occurs in some of the plurality of switches included in the field current supply device, it is possible to stably supply current to the field 100 .

Hereinafter, a method of supplying a field current according to an embodiment of the present invention will be described with reference to FIG. 5 , but the details mentioned in the description of the device for supplying a field current according to an embodiment of the present invention will be described in detail. to be omitted. 5 is a flowchart illustrating a method for supplying a field current in time series according to an embodiment of the present invention.

As shown in FIG. 5, the method for supplying field current according to an embodiment of the present invention includes a first step (S100) of checking the state of charge of the battery, and a second step (S200) of determining whether the switch 400 is faulty. and a third step ( S300 ) in which the field 100 is supplied with current from one of the first battery 200 and the second battery 300 .

The first step ( S100 ) is specifically a step of confirming the state of charge of at least one of the first battery 200 and the second battery 300 connected to supply power to the field 100 , for example, a high-voltage battery. It is checked whether the charge amount of the phosphorus first battery 200 is equal to or greater than a preset value (X).

If it is determined in the first step (S100) that the charge amount of the first battery 200 is equal to or greater than the preset value (X), in the second step (S200), whether the first switch 410 or the fourth switch 440 is faulty If it is determined whether or not both switches 410 and 440 are defective, the first battery 200 supplies current to the field 100, and the first switch 410 or the fourth switch 440 is ), it is determined whether the second switch 420 or the third switch 430 is faulty when it is determined that at least one of them is faulty. At this time, when it is determined that neither the second switch 420 nor the third switch 430 is faulty, the second battery 300 supplies current to the field 100 .

On the other hand, if it is determined in the first step (S200) that the charge amount of the first battery 200 is less than the preset value (X), in the second step (S200), the first switch 410 or the fourth switch 440 is Without determining whether or not there is a failure, it is immediately determined whether the second switch 420 or the third switch 430 has failed. As a result of the determination, if it is determined that neither the second switch 420 nor the third switch 430 is faulty, the second battery 300 supplies current to the field 100 .

As shown in FIG. 5 , the state of the switch may be checked after first checking the state of the battery, and conversely, it may be possible to check the state of the battery after first checking the state of the switch.

The embodiments described in this specification and the accompanying drawings are merely illustrative of some of the technical ideas included in the present invention. Therefore, since the embodiments disclosed in the present specification are for explanation rather than limitation of the technical spirit of the present invention, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. Modifications and specific embodiments that can be easily inferred by a person of ordinary skill in the art within the scope of the technical idea included in the specification and drawings of the present invention are included in the scope of the present invention. will have to be interpreted.

100: field
200: first battery
300: second battery
410, 420, 430, 440: first to fourth switches
510 and 520: first node, second node

Claims (10)

A field current supply device in an electric motor system of a mild hybrid vehicle, comprising:
a first battery 200 and a second battery 300 supplying current to the field 100;
a first switch 410 and a second switch 420 connected in series between the positive terminal and the negative terminal of the first battery 200; and
a third switch 430 and a fourth switch 440 connected in series between the positive terminal and the negative terminal of the second battery 300;
Both ends of the field 100 are formed between the first node 510 and the third switch 430 and the fourth switch 440 formed between the first switch 410 and the second switch 420 . Field current supplies, each connected to two nodes (520).
The method of claim 1,
At least one of the first switch (410) to the fourth switch (440) is a field current supply device that is controlled based on the states of the first battery (200) and the second battery (300).
3. The method of claim 2,
When the charging rule of the first battery 200 is greater than or equal to a preset value (X),
The first switch 410 and the fourth switch 440 are controlled to be on (On), the second switch and the fourth switch is controlled to be off (Off) a field current supply device.
3. The method of claim 2,
When the charge rate of the first battery 200 is less than a preset value (X),
The first switch 410 and the fourth switch 440 are controlled to be off, and the second switch 420 and the third switch 430 are controlled to be on.
The method of claim 1,
At least one of the first switch (410) to the fourth switch (440) is a field current supply device that is controlled based on the failure state of the first switch (410) to the fourth switch (440).
A method for supplying a field current in an electric motor system of a mild hybrid vehicle, the method comprising:
a first step (S100) of confirming the state of charge of at least one of the first battery 200 and the second battery 300 connected to supply power to the field 100;
It is determined whether the switch controlling the flow of current between the first battery 200 and the field 100 and the switch controlling the flow of current between the second battery 300 and the field 100 are faulty. a second step (S200); and
a third step in which the field 100 is supplied with current from one of the first battery 200 and the second battery 300 based on the determination result in the second step (S200);
including,
The switch includes a first switch 410 and a second switch 420 connected in series between a positive terminal and a negative terminal of the first battery 200 and a positive terminal of the second battery 300 and It includes a third switch 430 and a fourth switch 440 connected in series between the negative terminals, and both ends of the field 100 are disposed between the first switch 410 and the second switch 420 . are respectively connected to the formed first node 510 and the second node 520 formed between the third switch 430 and the fourth switch 440,
The second step (S200) is a field current supply method of determining whether at least one of the first switch 410 to the fourth switch 440 is faulty.
delete ◈Claim 8 was abandoned when paying the registration fee.◈ 7. The method of claim 6,
It is confirmed that the charge amount of the first battery 200 is equal to or greater than the preset value (X) in the first step (S100),
When it is determined that the first switch 410 and the fourth switch 440 are not faulty in the second step (S200),
The field current supply method in which the field 100 is supplied with current through the first battery 200 .
◈Claim 9 was abandoned at the time of payment of the registration fee.◈ 7. The method of claim 6,
It is confirmed that the charge amount of the first battery 200 is equal to or greater than the preset value (X) in the first step (S100),
In the second step (S200), it is determined that at least one of the first switch 410 and the fourth switch 440 is faulty, and the second switch 420 and the third switch 430 are faulty. If it is determined that no
The field current supply method in which the field 100 is supplied with current through the second battery 300 .
◈Claim 10 was abandoned when paying the registration fee.◈ 7. The method of claim 6,
It is confirmed that the charge amount of the first battery 200 is less than a preset value (X) in the first step (S100),
When it is determined that the second switch 420 and the third switch 430 are not faulty in the second step (S200),
The field current supply method in which the field 100 is supplied with current through the second battery 300 .

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