KR20170078437A - Method and system for protecting bidirectional dc-dc converter - Google Patents

Method and system for protecting bidirectional dc-dc converter Download PDF

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Publication number
KR20170078437A
KR20170078437A KR1020150188957A KR20150188957A KR20170078437A KR 20170078437 A KR20170078437 A KR 20170078437A KR 1020150188957 A KR1020150188957 A KR 1020150188957A KR 20150188957 A KR20150188957 A KR 20150188957A KR 20170078437 A KR20170078437 A KR 20170078437A
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South Korea
Prior art keywords
voltage
switch
converter
bidirectional
high voltage
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KR1020150188957A
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Korean (ko)
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김미나
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엘에스오토모티브 주식회사
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Priority to KR1020150188957A priority Critical patent/KR20170078437A/en
Publication of KR20170078437A publication Critical patent/KR20170078437A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • H02J2007/0059—
    • H02M2001/0009—

Abstract

The present invention discloses a method and system for protecting a bi-directional DC-DC converter. A bidirectional DC-DC converter system for performing a bidirectional voltage conversion between a high voltage power supply and a low voltage power supply according to an aspect of the present invention includes a high voltage switch which is a pair of switching elements switched in a boost mode or a buck mode in response to a switching signal A bi-directional DC-DC converter including a low voltage switch, an inductor connected to the high voltage switch and the low voltage switch; A first protection switch disposed between the high voltage switch and the high voltage power supply of the bidirectional DC-DC converter and performing a back-to-back switch function together with the high voltage switch or the second protection switch; A second protection switch disposed between the inductor of the DC-DC converter unit and the low voltage power source to perform a back-to-back switch function together with the low voltage switch or the first protection switch; A voltage detection device located between the first protection switch and the high voltage switch for detecting a voltage, comparing the detected voltage with a reference voltage, and transmitting the compared result to the control device; And a control device for controlling the bidirectional DC-DC converter based on the resultant value transmitted from the voltage detecting device.

Figure P1020150188957

Description

 [0001] METHOD AND SYSTEM FOR PROTECTING BIDIRECTIONAL DC-DC CONVERTER [0002]

The present invention relates to a method for protecting a bidirectional DC-DC converter and an apparatus therefor, and more particularly, to a bidirectional DC-DC converter for protecting a bidirectional DC-DC converter when a short- ≪ / RTI >

With the recent introduction of 48V systems for automobiles, there has been a need for a bidirectional DC-DC converter to control the flow of electricity from existing 12V and 48V systems. The bidirectional DC-DC converter controls the switching according to a command signal to operate in a boost mode or a buck mode.

However, in a system including the bidirectional DC-DC converter, if a short circuit due to switch burnout or the like occurs, proper control can not be performed to thereby cause damage to the circuit in the system.

Korean Patent Laid-Open No. 10-2010-0115087 (published on October 27, 2010)

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems, and it is an object of the present invention to provide an apparatus and a method for detecting a voltage by detecting a voltage between a high voltage power source and a bidirectional DC- And more particularly to a method and system for protecting a bi-directional DC-DC converter capable of stopping the operation of the system when the detected voltage is equal to or greater than the reference voltage.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a bi-directional DC-DC converter system for performing bi-directional voltage conversion between a high voltage power source and a low voltage power source, A bidirectional DC-DC converter including a high-voltage switch and a low-voltage switch, which are a pair of switching elements, and an inductor connected to the high-voltage switch and the low-voltage switch; A first protection switch disposed between the high voltage switch and the high voltage power supply of the bidirectional DC-DC converter and performing a back-to-back switch function together with the high voltage switch or the second protection switch; A second protection switch disposed between the inductor of the DC-DC converter unit and the low voltage power source to perform a back-to-back switch function together with the low voltage switch or the first protection switch; A voltage detection device located between the first protection switch and the high voltage switch for detecting a voltage, comparing the detected voltage with a reference voltage, and transmitting the compared result to the control device; And a control device for controlling the bidirectional DC-DC converter based on the resultant value transmitted from the voltage detecting device.

The voltage detecting device compares the detected voltage with a reference voltage, and when the detected voltage is out of the range of the reference voltage, it determines that the voltage is abnormal and transmits an abnormal result value to the control device.

When the detected voltage is greater than a maximum value among the values within the range of the reference voltage, the voltage detecting device determines that the switch is burned out and the abnormal result value is transmitted to the control device.

If the detected voltage is smaller than the minimum value of the range within the range of the reference voltage, the voltage detecting device determines that the current direction is an abnormal state in which the direction of the current has changed by itself according to its own algorithm in the bidirectional DC- To the control device.

The voltage detecting device compares the detected voltage with a reference voltage, and when the detected voltage has a value within a range of the reference voltage, it determines that the detected voltage is in a normal state and transmits a normal result value to the control device.

The voltage detecting device is an operational amplifier.

According to another aspect of the present invention, there is provided a high voltage switch and a low voltage switch, which are a pair of switching devices switched in a boost mode or a buck mode in response to a switching signal according to another aspect of the present invention, A bidirectional DC-DC converter including an inductor; A first protection switch disposed between the high voltage switch and the high voltage power supply of the bidirectional DC-DC converter and performing a back-to-back switch function together with the high voltage switch or the second protection switch; A second protection switch disposed between the inductor of the DC-DC converter unit and the low voltage power source to perform a back-to-back switch function together with the low voltage switch or the first protection switch; A voltage detection device located between the first protection switch and the high voltage switch for detecting a voltage, comparing the detected voltage with a reference voltage, and transmitting the compared result to the control device; And a control device for controlling the bidirectional DC-DC converter based on the resultant value transmitted from the voltage detecting device, the method for protecting the bidirectional DC-DC converter comprises the steps of: A voltage detecting step of detecting a voltage; And a voltage comparison step of comparing the voltage detected by the voltage detection device with a reference voltage and transmitting the compared result to the control device.

The voltage comparison step compares the detected voltage with a reference voltage. If the detected voltage is out of the range of the reference voltage, it is determined that the voltage is abnormal and the abnormal result value is transmitted to the control device.

In the voltage comparison step, if the detected voltage is larger than a maximum value among the values within the range of the reference voltage, it is determined that the switch is burned out and the abnormal result value is transmitted to the control device.

The voltage comparison step may be an abnormal state in which the direction of the current is changed according to a self-algorithm of the bidirectional DC-DC converter when the detected voltage is smaller than a minimum value among the values within the range of the reference voltage, To the control device.

The voltage comparison step compares the detected voltage with a reference voltage, and when the detected voltage has a value within the range of the reference voltage, it determines that the detected voltage is in a normal state and transmits a normal result value to the control device.

The voltage detecting device is an operational amplifier.

According to an aspect of the present invention, there is an effect that the stability of the bidirectional DC-DC converter can be secured by sensing an increased voltage when a short circuit occurs due to a switch burnout or the like.

Further, in manufacturing the system, the manufacturing cost can be reduced by not using an expensive sensor as a device for sensing a voltage.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
1 is a circuit diagram of a bidirectional DC-DC converter system according to an embodiment of the present invention;
2 schematically shows a configuration of a voltage detecting device according to an embodiment of the present invention,
FIG. 3 is a view schematically showing a configuration of a control apparatus according to an embodiment of the present invention,
Figure 4 is a flow diagram of a method for protecting a bi-directional DC-DC converter in accordance with an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be construed in accordance with the technical idea of the present invention based on the principle that the concept of a term can be properly defined in order to describe its own invention in the best way It must be interpreted as meaning and concept. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a circuit diagram of a bidirectional DC-DC converter system according to an embodiment of the present invention.

Referring to FIG. 1, a bidirectional DC-DC converter system according to the present embodiment includes a high voltage power supply 100, a low voltage power supply 200, a plurality of capacitors 301 and 303, a bidirectional DC-DC converter 400, The protection switches 510 and 520 and the voltage detection device 600 of FIG.

The high voltage power supply 100 has a relatively higher voltage than the low voltage power supply 200 and is a power supply device capable of charging and discharging, and a 48V battery can be adopted. The high voltage power supply 100 may be an ultra capacitor. When the protection switch 510 is turned on, the high voltage power supply 100 is electrically connected to the bidirectional DC-DC converter 400 to apply power to a load device using a high voltage or to charge the low voltage power supply 200 .

The low voltage power source 200 has a relatively lower voltage than the high voltage power source 100 and can be charged and discharged. A 12V battery or a 24V battery may be employed. When the adjacent protection switch 520 is turned on, the low voltage power supply 200 is electrically connected to the bidirectional DC-DC converter 400 to apply power to a load device using a low voltage or to charge the high voltage power supply 100 .

The capacitors 301 and 303 are connected between the high voltage power supply 100 and the low voltage power supply 200, and an output smoothing capacitor can be used. The capacitor 301 connected to the high voltage power supply 100 can be positioned so as to be connected in parallel with the high voltage power supply 100 between the first protection switch 510 and the high voltage switch 420, And the first protection switch 510 may be connected in parallel with the high voltage power supply 100. [

The bidirectional DC-DC converter 400 operates in the boost mode or the buck mode in accordance with the control signal of the controller 700. [ The bidirectional DC-DC converter 400 operates under the control of the controller 700 to operate in the boost mode in which the current of the low voltage power supply 200 is moved to the high voltage power supply 100, And operates in a buck mode for moving the current to the low voltage power supply 200. [

The bidirectional DC-DC converter 400 includes an inductor 410 that accumulates energy when a current flows, and a pair of switches 420 and 430 that complement each other.

The pair of switches included in the bidirectional DC-DC converter 400 is divided into a high voltage switch 420 and a low voltage switch 430, and each switch is turned on or off according to the control of the controller 700 . In detail, the switch is turned on or off based on a PWM (Pulse Width Modulation) signal generated in the controller 700. In particular, the low voltage switch 430 and the high voltage switch 420 operate complementarily with each other. That is, when the low voltage switch 430 is turned on, the high voltage switch 420 is turned off, and when the high voltage switch 420 is turned on, the low voltage switch 430 is turned off.

On the other hand, when the current is moved from the low voltage power supply 200 to the high voltage power supply 100, the low voltage switch 430 operates as the main switch and conversely when the current is moved from the high voltage power supply 100 to the low voltage power supply 200 , The high voltage switch 420 operates as the main switch. At this time, each of the switches may be a metal oxide semiconductor field effect (MOSFET) switch as a semiconductor switch. Further, the source terminal of the low voltage switch 430 may be grounded.

In the bi-directional DC-DC converter system, the first protection switch 510 is connected between the high voltage power supply 100 and the high voltage switch 420 to function as a back-to-back switch, (520) is connected between the low voltage power source (200) and the inductor (410) to perform a function of a back-to-back switch. The back-to-back switch is structured such that two MOSFET switches are disposed facing the back surface, thereby blocking current in both directions.

The drain terminal of the first protection switch 510 is connected to the drain terminal of the high voltage switch 420. The source terminal of the first protection switch 510 is connected to the anode of the high voltage power source 100, The first protection switch 510 and the high voltage switch 420 function as a back-to-back switch between the high voltage power supply 100 and the ground GND, Thereby preventing the abnormal current flowing between the grounds. In particular, the first protection switch 510 and the high voltage switch 420 prevent an abnormal current flow caused by a short between the high voltage power supply 100 and the ground, and prevent a reverse current The flow is blocked to protect the system from short-circuit and reverse polarity.

The drain terminal of the second protection switch 520 is connected to the inductor 410 of the bidirectional DC-DC converter 400. The source terminal of the second protection switch 520 is connected to the anode of the low- The second protection switch 520 and the low voltage switch 430 function as a back-to-back switch for the low voltage power supply 200 to generate a low voltage power supply 200 or a low voltage power supply 200). ≪ / RTI > In particular, the second protection switch 520 and the low-voltage switch 430 perform the function of a back-to-back switch to cut off the abnormal current flow caused by the internal short-circuit of the low-voltage power supply 200 and another component, The system can be protected by blocking the reverse polarity current generated due to the short circuit.

The first protection switch 510 and the second protection switch 520 function as a back-to-back switch between the high voltage power supply 100 and the low voltage power supply 200 so that the high voltage power supply 100 and the low voltage power supply 200 ) Can be protected by blocking abnormal current flow and short-circuiting reverse polarity current that may occur due to mis-wiring.

The voltage detecting device 600 is located between the first protection switch 510 and the high voltage switch 420 to detect the voltage and compare the detected voltage with the reference voltage. The voltage detecting device 600 may be an operational amplifier (OPAMP). At this time, the reference voltage may be arbitrarily set by a user in advance. For example, the reference voltage may have an error range of 25V upper and lower of the high voltage power supply 100. [ That is, when the high voltage power supply 100 is at 48V, the reference voltage may have a value within the range of 23V to 73V. The error range of the reference voltage is arbitrarily set by the user and is not limited to the above numerical value. Also, the reference voltage may be a voltage of the high voltage power supply 100.

If the detected voltage has a value within the range of the reference voltage, the voltage detector 600 may determine that the system is in a normal state and transmit the normal result to the controller 700. On the other hand, when the detected voltage is out of the range of the reference voltage, the voltage detector 600 determines that the voltage is abnormal and transmits the abnormal result to the controller 700.

In more detail, the voltage detecting device 600 can classify an abnormal state into two states as follows. That is, when the detected voltage is greater than the maximum value among the values within the range of the reference voltage, the voltage detecting device 600 determines that it is in an abnormal state (state 1) due to a short circuit such as a switch burnout, To the control device 700. If the detected voltage is smaller than the minimum value of the range of the reference voltage, the voltage detector 600 may determine that the voltage is abnormal (state 2), and transmit the result to the controller 700. When the state 2 occurs, the bidirectional DC-DC converter 400 does not operate under the control of the controller 700, but the current direction of the bidirectional DC-DC converter 400 This is the opposite. If the direction of the current is reversed according to the occurrence of the state 2, the battery becomes unstable. Accordingly, the controller 700 transmits an abnormal result to stop the operation of the system by the controller 700 have.

The control device 700 is electrically connected to the respective switches 420, 430, 510 and 520 and the voltage detecting device 600, and the respective switches 420, 430, 510 and 520, And the operation of the voltage detecting device 600 are controlled. The control device 700 controls the high voltage switch 420 and the low voltage switch 420 in accordance with the operation mode when the first and second protection switches 510 and 520 are turned on to initially drive the bidirectional DC- 430 to the PWM signal to flow the current. For example, when the buck mode is operated, the control device 700 transmits the PWM signal only to the high voltage switch 420, and transmits the PWM signal only to the low voltage switch 430 when the boost mode is operated.

Meanwhile, the control device 700 receives the voltage comparison result value received from the voltage detecting device 600 and controls the system. That is, the control device 700 can continuously operate the system when the received voltage comparison result is a normal result value, and can stop the operation of the system when the result is abnormal. At this time, the normal result value can be output when the detected voltage has a value within the range of the reference voltage, and the abnormal result value can be outputted when the detected voltage is out of the range of the reference voltage.

2 is a view schematically showing a configuration of a voltage detecting apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the voltage detection device 600 according to the present embodiment includes a voltage detection unit 210 and a voltage comparison unit 230. Meanwhile, the voltage detecting device 600 may be an operational amplifier (OPAMP).

The voltage detector 210 detects an input voltage. For example, the voltage detecting unit 210 detects a voltage generated when a current flows from the high voltage power source 100 to the low voltage power source 200 or from the low voltage power source 200 to the high voltage power source 100.

The voltage comparator 230 compares the voltage detected by the voltage detector 210 with a reference voltage and transmits the compared result to the controller 700. [ At this time, the reference voltage may be arbitrarily set by a user in advance. For example, the reference voltage may have an error range of 25V upper and lower of the high voltage power supply 100. [ That is, when the high voltage power supply 100 is at 48V, the reference voltage may have a value within the range of 23V to 73V. The error range of the reference voltage is arbitrarily set by the user and is not limited to the above numerical value. Also, the reference voltage may be a voltage of the high voltage power supply 100.

When the voltage detected by the voltage detector 210 has a value within the range of the reference voltage, the voltage comparator 230 may determine that the system is in a normal state and transmit the normal result to the controller 700. [ If the voltage detected by the voltage detector 210 is out of the range of the reference voltage, the voltage comparator 230 may determine that the system is in an abnormal state and transmit the abnormal result to the controller 700.

In more detail, the voltage comparator 230 may classify an abnormal state into two states as follows. That is, when the detected voltage is greater than the maximum value among the values within the range of the reference voltage, the voltage comparator 230 determines that it is in an abnormal state (state 1) due to a short circuit such as switch burnout, To the control device 700. If the detected voltage is smaller than the minimum value of the range of the reference voltage, the voltage comparator 230 determines that the voltage is abnormal (state 2), and transmits the result to the controller 700. When the state 2 occurs, the bidirectional DC-DC converter 400 does not operate under the control of the controller 700, but the current direction of the bidirectional DC-DC converter 400 This is the opposite. If the direction of the current is reversed according to the occurrence of the state 2, the battery becomes unstable. Accordingly, the controller 700 transmits an abnormal result to stop the operation of the system by the controller 700 have.

3 is a view schematically showing a configuration of a control apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the controller 700 according to the present embodiment includes a communication unit 310, a switching controller 330, and a controller 350.

The communication unit 310 performs a function of communicating with an upper level controller such as an ECU (Electronic Control Unit) of a vehicle through CAN (Controller Area Network) communication.

The switching controller 330 loads a control signal generator and controls each switch operation using the control signal generator. When the bidirectional DC-DC converter system is operated, the switching controller 330 generates a control signal to turn on each switch so that the high voltage power source 100 and the low voltage power source 200 and the bidirectional DC-DC converter 400 Can be connected. That is, when the bidirectional DC-DC converter system is activated, the switching controller 330 generates a control signal for turning on both the first protection switch 510 and the second protection switch 520, 420, and the low-voltage switch 430, as shown in FIG. The bidirectional DC-DC converter system including the first and second protection switches 510 and 520 is connected to the high voltage power supply 100 and the high voltage power supply 100 through the first protection switch 510 and the second protection switch 520, Unintended abnormal currents (e.g., reverse polarity current, transient current, etc.) that may occur between the low voltage power supply 200 can be blocked. Also, unintended current flow between the high voltage power supply 100 and the ground GND is cut off through the first protection switch 510 and the high voltage switch 420. The unintentional current flow generated in the low voltage power supply 200 is cut off through the second protection switch 520 and the low voltage switch 430.

The controller 350 receives the resultant value from the voltage detecting device 600 and can control the operation of the bidirectional DC-DC converter system. That is, when the controller 350 receives the normal result from the voltage detector 600, the controller 350 continuously operates the bidirectional DC-DC converter system. However, when the controller 350 receives the abnormal result value from the voltage detector 600, the controller 350 may stop the operation of the bidirectional DC-DC converter system.

The voltage detecting device 600 of FIG. 2 and the control device 700 of FIG. 3 are described as being separate from each other. However, the voltage detecting device 600 is not limited to the control May be included in the device 700.

Figure 4 is a flow diagram of a method for protecting a bi-directional DC-DC converter in accordance with an embodiment of the present invention.

When power is applied to the system, each switch and controller 700 and bidirectional DC-DC converter 400 operate.

The voltage detecting apparatus 600 detects the input voltage and compares the input voltage with the reference voltage (S410) (S430). The reference voltage may be arbitrarily set by a user in advance. For example, the reference voltage may have an error range of 25V upper and lower of the high voltage power supply 100. [ That is, when the high voltage power supply 100 is at 48V, the reference voltage may have a value within the range of 23V to 73V. The error range of the reference voltage is arbitrarily set by the user and is not limited to the above numerical value. Also, the reference voltage may be a voltage of the high voltage power supply 100.

The voltage detecting device 600 transmits the result according to the comparison result to the controller 700 (S450). That is, when the detected voltage has a value within the range of the reference voltage, the voltage detector 600 may determine that the system is in a normal state and transmit the normal result to the controller 700. On the other hand, when the detected voltage is out of the range of the reference voltage, the voltage detector 600 determines that the voltage is abnormal and transmits the abnormal result to the controller 700.

In more detail, the voltage detecting device 600 can classify an abnormal state into two states as follows. That is, when the detected voltage is greater than the maximum value among the values within the range of the reference voltage, the voltage detecting device 600 determines that it is in an abnormal state (state 1) due to a short circuit such as a switch burnout, To the control device 700. If the detected voltage is smaller than the minimum value of the range of the reference voltage, the voltage detector 600 may determine that the voltage is abnormal (state 2), and transmit the result to the controller 700. When the state 2 occurs, the bidirectional DC-DC converter 400 does not operate under the control of the controller 700, but the current direction of the bidirectional DC-DC converter 400 This is the opposite. If the direction of the current is reversed according to the occurrence of the state 2, the battery becomes unstable. Accordingly, the controller 700 transmits an abnormal result to stop the operation of the system by the controller 700 have.

The control device 700 receives the result of comparing the voltage detected from the voltage detecting device 600 with the reference voltage, and can continuously operate or stop the system according to whether the voltage is normal or abnormal (S470). For example, when the control device 700 receives '0' as a normal result value from the voltage detecting device 600, the control device 700 can continuously operate the system, and if the abnormal result value is '1', the control device 700 can stop the system .

As described above, according to the embodiment of the present invention, the operation of the system can be stopped by detecting an increased voltage in the event of a short circuit due to the burnout of the switch, thereby securing the stability of the bidirectional DC-DC converter.

Further, in the manufacture of a system, a device for sensing a voltage, that is, a voltage detection device, can be made less expensive by not using an expensive sensor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: High voltage power source
200: Low voltage power source
301, 303: Capacitors
400: Bidirectional DC-DC Converter
410: inductor
420: High voltage switch
430: Low-voltage switch
510: first protection switch
520: second protection switch
600: voltage detecting device
700: Control device

Claims (12)

A bidirectional DC-DC converter system for performing bidirectional voltage conversion between a high voltage power supply and a low voltage power supply,
A bidirectional DC-DC converter including a high voltage switch and a low voltage switch, which are a pair of switching devices switched in a boost mode or a buck mode in response to a switching signal, and an inductor connected to the high voltage switch and the low voltage switch;
A first protection switch disposed between the high voltage switch and the high voltage power supply of the bidirectional DC-DC converter and performing a back-to-back switch function together with the high voltage switch or the second protection switch;
A second protection switch disposed between the inductor of the DC-DC converter unit and the low voltage power source to perform a back-to-back switch function together with the low voltage switch or the first protection switch;
A voltage detection device located between the first protection switch and the high voltage switch for detecting a voltage, comparing the detected voltage with a reference voltage, and transmitting the compared result to the control device; And
And a control device for controlling the bidirectional DC-DC converter based on the resultant value transmitted from the voltage detection device. The method according to claim 1,
Wherein the voltage detecting device compares the detected voltage with a reference voltage and determines an abnormal state when the detected voltage is out of a range of a reference voltage to transmit an abnormal result value to the control device . 3. The method of claim 2,
Wherein the voltage detection device determines an abnormal state where a short circuit occurs due to burnout of the switch and transmits an abnormal result value to the control device when the detected voltage is larger than a maximum value among the values within the range of the reference voltage, system. 3. The method of claim 2,
If the detected voltage is smaller than the minimum value of the range within the range of the reference voltage, the voltage detecting device determines that the current direction is an abnormal state in which the direction of the current has changed by itself according to its own algorithm in the bidirectional DC- Bidirectional DC-DC converter system for transmitting to a control device. The method according to claim 1,
Wherein the voltage detection device compares the detected voltage with a reference voltage, and when the detected voltage has a value within a range of the reference voltage, determines that the detected voltage is in a normal state and transmits a normal result value to the control device. 6. The method according to any one of claims 1 to 5,
Wherein the voltage detection device is an operational amplifier. A bidirectional DC-DC converter including a high voltage switch and a low voltage switch, which are a pair of switching devices switched in a boost mode or a buck mode in response to a switching signal, and an inductor connected to the high voltage switch and the low voltage switch; A first protection switch disposed between the high voltage switch and the high voltage power supply of the bidirectional DC-DC converter and performing a back-to-back switch function together with the high voltage switch or the second protection switch; A second protection switch disposed between the inductor of the DC-DC converter unit and the low voltage power source to perform a back-to-back switch function together with the low voltage switch or the first protection switch; A voltage detection device located between the first protection switch and the high voltage switch for detecting a voltage, comparing the detected voltage with a reference voltage, and transmitting the compared result to the control device; And a control device for controlling the bidirectional DC-DC converter based on the resultant value transmitted from the voltage detection device, the method comprising:
A voltage detecting step of detecting a voltage input to the voltage detecting device; And
And a voltage comparing step of comparing the voltage detected by the voltage detecting device with a reference voltage and transmitting the compared result to the control device. 8. The method of claim 7,
The voltage comparison step may include:
And comparing the detected voltage with a reference voltage to determine an abnormal state when the detected voltage is out of the range of the reference voltage, and transmitting the abnormal result value to the control device. 9. The method of claim 8,
The voltage comparison step may include:
DC converter according to claim 1, wherein when the detected voltage is larger than a maximum value of the range of the reference voltage, the abnormal result is determined to be an abnormal state where a short circuit occurs due to burnout of the switch and the abnormal result value is transmitted to the controller. 9. The method of claim 8,
The voltage comparison step may include:
DC converter according to an internal algorithm of the bidirectional DC-DC converter when the detected voltage is smaller than the minimum value of the range within the range of the reference voltage, the bidirectional DC-DC converter determines that the current direction is an abnormal state, A method for protecting a DC-DC converter. 8. The method of claim 7,
The voltage comparison step may include:
A method for protecting a bidirectional DC-DC converter that compares a detected voltage with a reference voltage and determines a normal state when the detected voltage has a value within a range of the reference voltage, and transmits a normal result value to the control device. 12. The method according to any one of claims 7 to 11,
Wherein the voltage detection device is an operational amplifier.
KR1020150188957A 2015-12-29 2015-12-29 Method and system for protecting bidirectional dc-dc converter KR20170078437A (en)

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