KR101692111B1 - System and method for determining a failure of the circuit using LC resonance - Google Patents

Abstract

The present invention relates to a system and method for judging a circuit fault using an LC resonance, and more particularly, to a system and method for judging a circuit fault using an LC resonance, comprising: at least one battery cell connected in series; a resonance module performing a resonance operation; A driving unit including a switch unit provided; And a controller for controlling the ON / OFF operation of the switch unit so that the at least one battery cell and the resonant module are connected to each other, measuring a voltage of the connected resonant module, and determining whether the drive unit is faulty based on the measured voltage. And a control unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and a method for determining a circuit failure using an LC resonance,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system and method for determining a circuit failure using an LC resonance, and more particularly, and more particularly, to a system and method for judging whether or not a circuit breakdown occurs in at least one switch included in a charge equalization circuit by measuring a terminal voltage of a node.

Generally, there is a risk of explosion when the voltage across the battery (battery cell) exceeds a certain value, and when the voltage falls below a certain value, the battery cell is damaged. Particularly, when a hybrid electric vehicle or a notebook computer is required to supply a relatively large amount of power, a battery module (battery pack) in which battery cells are connected in series should be used when power is supplied using the battery cell. However, when such a battery module is used, a voltage imbalance may occur due to a variation in performance of each battery cell.

In addition, when one battery cell in the battery module reaches the upper limit voltage before the other battery cells in charging the battery module, the battery module can no longer be charged. Therefore, shall. In such a case, the charging capacity of the battery module does not reach the rated charging capacity.

On the other hand, in order to stabilize the energy transfer in the charge equalization circuit using the ELC resonance method, it is important to diagnose whether the circuit operates normally before operation.

Conventionally, in order to diagnose the normal operation of such a circuit, it has been determined whether the circuit operates normally by measuring the voltage of both terminal nodes of each battery cell. At this time, since a large number of battery cells are included in the battery pack, There is a problem in that it takes a long time to measure the node voltage of the node.

Korean Patent Publication No. 10-2014-0106070

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a method of measuring the voltage at both side nodes of an LC resonance module used in a charge equalization circuit for balancing energy among at least one battery cell included in a battery pack The present invention provides a fault diagnosis system and method for diagnosing whether or not at least one of the switches included in the charge equalization circuit is short-circuited and determining whether the circuit is faulty quickly and accurately.

The circuit failure determination system using an Elc resonance according to an embodiment of the present invention may include at least one battery cell connected in series, a resonance module performing a resonance operation, and at least one battery cell connected to the at least one battery cell, A driving unit including a switch unit provided; And a controller for controlling the ON / OFF operation of the switch unit so that the at least one battery cell and the resonant module are connected to each other, measuring a voltage of the connected resonant module, and determining whether the drive unit is faulty based on the measured voltage. . ≪ / RTI >

In one embodiment, the switch section comprises: a first switch having one or more switches connected between respective terminals of the one or more battery cells and a first common node; A second switch having one or more switches connected between respective terminals of the one or more battery cells and a second common node; And a changeover switch connected and connected between the first and second common nodes.

In one embodiment, the first switch, the second switch, and the changeover switch may be composed of a single pole single throw (SPST) switch.

In one embodiment, the first switch, the second switch, and the changeover switch may each be constituted by a pair of MOSFETs (Metal Oxide Semiconductor Field Effect Transistors).

In one embodiment, the determination section may turn on the changeover switch to form an ELC resonance circuit and discharge the electric charge stored in the resonance module.

In one embodiment, the determination unit may perform a zero current switching operation for controlling on / off operation of the switch unit at a time corresponding to a half period of the resonance module.

In one embodiment, the determination unit includes: a switch signal generation unit for generating a signal for turning on or off the switch unit and outputting the signal to the drive unit; A voltage measuring unit for measuring a voltage of the resonance module; And a malfunction determining unit for determining whether the measured voltage value is within a predetermined voltage range after receiving the measured voltage value from the voltage measuring unit and determining whether the driving unit is malfunctioning or not, can do.

In one embodiment, the switch signal generator may turn on one or more switches included in the switch unit according to a predetermined test sequence.

According to another aspect of the present invention, there is provided a method for determining a circuit fault using an RF resonance, comprising: connecting at least one battery cell in series and connecting a resonance module and a switch unit performing a resonance operation; And controlling the on / off operation of the connected switch unit to measure a voltage value of the resonance module, and determining whether the drive unit is malfunctioning based on the measured voltage value.

In one embodiment, the connecting step comprises connecting at least one first switch between each terminal of the at least one battery cell and a first common node, respectively; Connecting at least one second switch unit between each terminal of the at least one battery cell and a second common node; And connecting a changeover switch between the first and second common nodes.

In one embodiment, the connecting step may include a step of causing the first switch, the second switch, and the changeover switch to be configured as a pair of metal oxide semiconductor field effect transistors, respectively.

In one embodiment, the determining may include turning on the changeover switch to form an ELC resonant circuit and discharging the charge stored in the resonant module.

In one embodiment of the present invention, the determining includes performing a Zero Current Switching operation for controlling on / off operation of the switch unit at a time corresponding to a half period of the resonance module can do.

In one embodiment, the determining may include generating and outputting a signal to turn on or off the switch unit; Measuring a voltage of the resonant module; And a step of determining whether the measured voltage value is within a predetermined voltage range after receiving the measured voltage value from the voltage measuring unit and determining whether the driving unit is malfunctioning or not, have.

In one embodiment, the outputting may include turning on one or more switches included in the switch unit to a predetermined test sequence.

The present invention has the advantage that it is possible to diagnose whether or not at least one of the switches included in the charge equalization circuit is short-circuited by measuring the node terminal voltages on both sides of the resonance module.

In addition, the present invention minimizes the heat generation of the switch by performing the zero voltage switching operation, thereby reducing the heat generation of the device and significantly improving the service life.

FIG. 1 is a block diagram schematically showing the configuration of a circuit fault determination system 100 using an LCS resonance according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a diagram showing the configuration of the driving unit 110 shown in FIG. 1 in more detail.
FIG. 3 and FIG. 4 are diagrams showing in more detail a state in which the switch unit 113 shown in FIG. 1 receives a drive voltage.
5 is a diagram illustrating a test sequence according to an embodiment of the present invention in more detail.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the examples.

FIG. 1 is a block diagram schematically showing a configuration of a system fault judgment system 100 using an ELC resonance according to an embodiment of the present invention. FIG. 2 is a block diagram of a configuration of a driving unit 110 shown in FIG. And FIGS. 3 and 4 are views showing a state in which the switch unit 113 shown in FIG. 1 receives a driving voltage in more detail.

Referring to FIGS. 1 to 4, the circuit fault diagnosis system 100 using the LC resonance according to the present invention may include a driving unit 110 and a determination unit 120.

First, the driving unit 110 includes at least one battery cell 111 connected in series, a resonance module 112 performing a resonance operation, and a plurality of battery cells 111 connected to the at least one battery cell 111, And a switch unit 113. The switch unit 113 may further include a resistance unit 118.

The battery cells 111 may be connected in series in one or more of the battery modules, and a plurality of battery cells 111 may be connected in series to form a high-voltage battery pack.

The resonance module 112 may include an inductor Ls and a capacitor Cs connected in series. Since the resonance module 112 uses a conventional known technique, a detailed description thereof will be omitted.

The switch unit 113 may be configured to transfer the charge stored in the resonance module to each of the one or more battery cells 111 or to supply the charge to a battery cell having a relatively low charge amount, And can form a path.

At this time, the driving unit 110 may connect one or more battery cells 111 and the resonant module 112 through the first and second common nodes 114a and 114b, more specifically, the first common node 114a, May be connected to one terminal of the battery cell 111 located at the rearmost end of the battery cells 111 connected in series starting from a position adjacent to the capacitor Cs of the resonance module 112. [ The second common node 114b may be connected to the other terminal of the battery cell 111 located at the rearmost end of the battery cells 111 connected in series starting from a position adjacent to the inductor Ls of the resonance module 112 .

2, assume that the battery cell 111 at the forefront of the at least one battery cell 111 connected in series is M ₁ and the battery cell at the rear end is M _n .

The first common node 114a and the M ₁ one terminal are connected to each other via SW ₁ and the first common node 114a and the M ₃ one terminal are connected to each other via SW ₃ , M ₅ terminals are connected to each other through SW ₅ .

That is, the first common node (114a) and M _1, M _3, M ₅ one terminal of the odd-numbered battery cells, such as the SW _1, SW _{3, respectively,} SW ₅ Etc., and in particular, the first common node 114a and the other terminal of the last battery cell M _n may be connected to each other, and the switch at this time may be SW _{n +1} .

In addition, the second common node 114b and the _second M ₂ terminal may be connected to each other through SW ₂ , and the second common node 114b and the M ₄ other terminal may be connected to each other through SW ₄ .

That is, the second common node 114b and the even-numbered battery cells such as M ₂ , M ₄ , and M ₆ and the M-terminal are SW _{2 ,} SW _{4 , and} SW ₆ Etc., and in particular, the second common node 114b and one terminal of the last battery cell M _n may be connected to each other, and the switch at this time may be SW _n .

In one embodiment, the switch unit 113 included in the driving unit 110 may correspond to a single pole single throw (SPST) switch.

In addition, each of the switch units 113 may be formed of a pair of MOSFETs (Metal Oxide Semiconductor Field Effect Transistor).

In order for the switch unit 113 included in the driving unit 110 to be driven, a driving voltage must be applied. This will be described in more detail with reference to FIG. 3 and FIG. 4 which will be described later.

The resistor unit 118 is provided between the battery cell 111 and the switch unit 113 and serves as a fuse to prevent an overcurrent from flowing due to damage or breakage of the switch unit 113 can do.

3 and 4, the remaining switches except the switch SW _{n +1} and the changeover switch 113a located at the rearmost end of the first common node 114a have gate drive voltages of 10 to 15 v for driving the MOSFETs In order to be authorized, the corresponding drive voltage is applied to the adjacent battery cell module.

The voltage of each battery cell can be rapidly changed according to the charge / discharge state of the battery cell. Therefore, a stable power is generated by using a diode and a capacitor, and a regulator 115 ). ≪ / RTI > Accordingly, the driving unit 110 transmits the control signal transmitted from the determining unit 120 to be described later to the high side gate driver 116. In the high side driver 116, .

4, the switch SW _{n + 1} and the switch 113a located at the rearmost end of the first common node 114a are driven by a separate bootstrap circuit 117 The bootstrap circuit 117 may be configured to include a capacitor C _B and a diode D _B.

At this time, when the charge to charge Cs, Cb, and to transfer the charge with, switch on the last stage of the charge first common node (114a) filled in the Cb (SW _{n +1)} and transmitted to the switching switch (113a) .

The changeover switch 113a may mean a charge inversion switch and may in particular reverse the polarity of the voltage of the capacitor of the resonance module 112. In addition, To discharge the charge charged in the resonance capacitor in the resonance module 112 through the control of the resonance frequency.

Next, the determination unit 120 may include a switch signal generation unit 121, a voltage measurement unit 122, and a failure determination unit 123.

First, the switch signal generating unit 121 generates a control signal for turning on or off one or more switches included in the switch unit 113, and transmits the generated control signal to each of the switches. At this time, the control signal may include a control signal for sequentially turning on or off all the switches and a control signal for finally turning on the changeover switch 113a.

Each switch which receives the control signal can be connected to the resonance module 112 by being turned on.

The voltage measuring unit 122 measures voltages of both terminals (right leg and left leg) of the resonant module 112 to be connected to one or more battery cells 111 through the switch ON, And to transmit it to the failure determination unit 123, which will be described later.

The failure determining unit 123 determines whether the measured voltage value is within a predetermined voltage range after receiving the resonance capacitor voltage value of the resonance module 112 measured from the voltage measuring unit 122 described above, It is determined whether or not the switch unit 113 is short-circuited according to the result, and the determination at this time is made according to a preset test sequence.

This will be described with reference to FIG.

5 is a diagram illustrating a test sequence according to an embodiment of the present invention in more detail.

5, a voltage test is performed for each of the pair of switches in the form of a pair of two switches. At this time, the switches SW2 to SW4 except for the first switch SW1 and the last switch SWn + SWn) are all tested two times.

For example, in the first test (test1), the first switch SW1 and the second switch SW2 are turned on to be connected to the resonance module 112.

Then, in the voltage measuring unit 122, the resonance capacitor voltage of the resonance module 112 is measured. In the failure judging unit 123, the voltage of both terminals of the resonance module 112 It is judged whether there is an abnormality in the car or in the resonant capacitor voltage, and it is compared with a malfunction determination criterion to determine whether or not the switch is short-circuited finally.

Here, the voltage value measured in the normal operation refers to Vd (voltage difference between both terminals) in the first test (both terminals of the resonance module 112 when the first switch SW1 and the second switch SW2 are turned on) And the resonance capacitor voltage Vcs (the voltage value of the resonance capacitor when the first switch SW1 and the second switch SW2 are turned on) in the first test are all positive voltage values of the battery cell 111 It can mean time.

Also, Vd and Vcs in the second test may indicate when the negative voltage value of the battery cell 111 is negative.

That is, Vd and Vcs in the odd-numbered test may be the positive voltage value of the battery cell 111, and Vd and Vcs in the even-numbered test may be the negative voltage value of the battery cell 111 can do.

The malfunction determination criterion is a criterion for determining whether or not the first switch SW1 or the second switch SW2 is faulty when there is an abnormality in Vd (voltage difference between both terminals), or when there is an abnormality in the capacitor voltage Vcs It may mean that the resonance inductor Ls or the resonance capacitor Cs is judged to be faulty.

In the second test, if Vd is abnormal, it is determined whether or not the first test is passed. If the Vd has passed, the third switch (SW3) is judged to be faulty.

In the third test, if Vd is abnormal, it is judged whether or not the second test is passed. If the Vd has passed, the fourth switch SW4 is judged as a failure.

That is, if Vd is abnormal in the n-th test, it is determined whether or not the n-1th test is passed. If the result of the (n-1) th test passes, the n + 1th switch SWn + 1 is judged to be faulty.

Finally, in the final test (test n + 1), the changeover switch 113a is turned on to be connected to the resonance module 112. In this case, the voltage value measured during normal operation may be a value when both Vd and Vcs are zero have.

In this case, if the Vd and Vcs are abnormal, it is judged whether or not the nth test is passed. If it is determined that the nth test has passed, it may mean that the changeover switch 113a is judged as failed.

If the normal voltage of the resonance module 112 is measured in all of these test processes, the failure determination unit 123 determines that the circuit in the driving unit 110 and the switch unit 113 are not failed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: Battery cell balancing system using EL resonance
110:
111: Battery cell 112: Resonance module
113: switch section 113a: switch
114a: first common node 114b: second common node
115: Regulator 116: High side driver
117: bootstrap circuit 118:
120:
121: Switch signal generating unit 122: Voltage measuring unit
123: Fault determination unit

Claims (15)

A driving unit including at least one battery cell connected in series, a resonance module performing a resonance operation, and a switch unit provided to transfer the electric charge stored in the resonance module to each of the at least one battery cell;
A judging unit for controlling the ON / OFF operation of the switch unit so that the at least one battery cell and the resonance module are connected to each other, measuring a voltage of the connected resonance module, and determining whether the drive unit is faulty based on the measured voltage;
A regulator for forming a voltage for driving the switch unit;
A high side gate driver for receiving a control signal applied from the determination unit and controlling the switch unit; And
A bootstrap circuit including a capacitor and a diode,
Wherein,
Generating a signal for turning on or off the switch unit, outputting the signal to the high side gate driver, generating a switch signal for turning on one or more switch units included in the switch unit according to a predetermined test sequence, part;
A voltage measuring unit for measuring a voltage of the resonance module; And
And a malfunction determining unit for determining whether the measured voltage value is within a predetermined voltage range after receiving the measured voltage value from the voltage measuring unit and determining whether the driving unit is malfunctioning or not, ≪ / RTI >
Circuit fault diagnosis system using LC resonance.
The method according to claim 1,
Wherein,
A first switch having one or more switches connected between respective terminals of the one or more battery cells and a first common node;
A second switch having one or more switches connected between respective terminals of the one or more battery cells and a second common node; And
And a changeover switch connected and connected between the first and second common nodes.
Circuit fault diagnosis system using LC resonance.
3. The method of claim 2,
Wherein the first switch, the second switch and the changeover switch are constituted by a single pole single throw (SPST) switch.
Circuit fault diagnosis system using LC resonance.
3. The method of claim 2,
Characterized in that the first switch, the second switch and the changeover switch are each constituted by a pair of MOSFETs (Metal Oxide Semiconductor Field Effect Transistor)
Circuit fault diagnosis system using LC resonance.
3. The method of claim 2,
Wherein,
And the switch is turned on to form an ELC resonance circuit and to discharge the electric charge stored in the resonance module.
Circuit fault diagnosis system using LC resonance.
The method according to claim 1,
Wherein,
And performing a Zero Current Switching operation for controlling the on / off operation of the switch unit at a time corresponding to a half period of the resonance module.
Circuit fault diagnosis system using LC resonance.
delete delete Connecting a resonance module and a switch unit connecting one or more battery cells in series through the driving unit and performing a resonance operation;
Controlling the on / off operation of the connected switch unit through the determination unit to measure a voltage value of the resonance module, and determining whether the drive unit is faulty based on the measured voltage value;
Forming a voltage for driving the switch unit through a regulator;
Receiving the control signal from the determination unit and controlling the switch unit in the high side gate driver; And
Forming a bootstrap circuit including a capacitor and a diode,
The step of determining whether or not the driving unit is malfunctioned,
A switch signal generating unit for generating a signal for turning the switch unit on or off and outputting the signal to the high side gate driver; and controlling one or more switches included in the switch unit according to a predetermined test sequence );
Measuring a voltage of the resonant module through a voltage measuring unit; And
Determining whether the measured voltage value is within a predetermined voltage range after receiving the measured voltage value from the voltage measuring unit through the failure determining unit, and determining whether the driving unit is faulty according to the determination result; ≪ / RTI >
A method for judging a circuit fault using an ELC resonance.
10. The method of claim 9,
Wherein the connecting step comprises:
Connecting at least one first switch between each terminal of the one or more battery cells and a first common node, respectively;
Connecting at least one second switch unit between each terminal of the at least one battery cell and a second common node; And
And connecting a changeover switch between the first and second common nodes.
A method for judging a circuit fault using an ELC resonance.
11. The method of claim 10,
Wherein the connecting step comprises:
And making the first switch, the second switch, and the changeover switch each comprise a pair of MOSFETs (Metal Oxide Semiconductor Field Effect Transistors).
A method for judging a circuit fault using an ELC resonance.
11. The method of claim 10,
Wherein the determining step comprises:
And turning on the changeover switch to form an ELC resonance circuit and discharge the electric charge stored in the resonance module.
A method for judging a circuit fault using an ELC resonance.
10. The method of claim 9,
Wherein the determining step comprises:
And performing a Zero Current Switching operation for controlling on / off operation of the switch unit at a time corresponding to a half period of the resonance module.
A method for judging a circuit fault using an ELC resonance.
delete delete

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