KR20170049177A - Bidirectional non-isolation dc-dc converter including precharge circuit - Google Patents

Bidirectional non-isolation dc-dc converter including precharge circuit Download PDF

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Publication number
KR20170049177A
KR20170049177A KR1020150150231A KR20150150231A KR20170049177A KR 20170049177 A KR20170049177 A KR 20170049177A KR 1020150150231 A KR1020150150231 A KR 1020150150231A KR 20150150231 A KR20150150231 A KR 20150150231A KR 20170049177 A KR20170049177 A KR 20170049177A
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KR
South Korea
Prior art keywords
switch
converter
precharge
voltage power
voltage
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KR1020150150231A
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Korean (ko)
Inventor
김형준
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엘에스오토모티브 주식회사
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Priority to KR1020150150231A priority Critical patent/KR20170049177A/en
Priority to PCT/KR2015/011994 priority patent/WO2017073828A1/en
Publication of KR20170049177A publication Critical patent/KR20170049177A/en

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    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention relates to a precharge circuit appropriate for miniaturization by reducing the number of circuit components. A non-isolated bidirectional DC-DC converter that performs bi-directional voltage conversion between a high voltage supply and a low voltage supply comprises: a DC-DC converter module including a high-voltage switch and a low-voltage switch, which are a pair of switching elements switched to 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; and a precharge circuit for forming a precharge line for sharing the inductor with the DC-DC converter module, wherein the precharge circuit has one end connected in parallel with a low voltage power source and the other end connected in parallel with the inductor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bidirectional DC-DC converter including a precharge circuit,

The present invention relates to a non-isolated bidirectional DC-DC converter, and more particularly to a non-isolated bidirectional DC-DC converter including an improved precharge circuit.

With the recent introduction of 48V systems for automobiles, there has been a need for a bidirectional DC-DC converter for controlling the electrical flow of existing 12V or 24V systems and 48V systems. The bidirectional DC-DC converter is controlled in accordance with a command signal to operate in a boost mode or a buck mode. The following patent document discloses a bidirectional DC-DC converter and a control method thereof.

On the other hand, when charging a 48V power source, which is a high voltage power source, by using a low voltage power source (12V or 24V power source), a precharge circuit for preventing an overcurrent from flowing into a 48V power source to generate abnormal heat is a non- DC converter. In addition, back-to-back switches are often used in non-isolated bidirectional DC-DC converters to protect internal components from abnormal currents.

1 is a diagram illustrating a conventional non-isolated bidirectional DC-DC converter with a pre-charge circuit and a back-lit switch.

1, a back-to-back switch 110 is connected to a high voltage power supply terminal V H in a conventional non-isolated bidirectional DC-DC converter 100, Thereby protecting the non-insulated bidirectional DC-DC converter 100.

The back-to-back switch 110 is comprised of two switches Q 3 and Q 4 which are arranged to be interlaced and included in the non-insulated bidirectional DC-DC converter 100 from an over-voltage or over-current, a noise signal, Which protects the supplied accessories. That is, the back-to-back switch 110 protects the internal circuitry and other components from a high-voltage power supply (V H ) short circuit, a low-voltage power supply (V L ) short circuit,

The output line of the precharge circuit 120 is connected in parallel to the high voltage power supply V H and the input line of the precharge circuit 120 is connected in parallel with the low voltage power supply V L to form a precharge line . The pre-charge circuit 120 operates before the non-insulated bidirectional DC-DC converter module 130 when the high voltage power supply V H is charged, and is supplied to the inductor 124 ) store energy in and by passing the accumulated energy in the high voltage power source (V H) is filled with a high-voltage power supply (V H). The precharge circuit 120 includes an inductor 124, a capacitor 123, a plurality of diodes 121 and 122, and a precharge switch Q 5 for progressing charging of the high power source voltage V H do.

In the step of charging the high-voltage power supply (V H), the switch (Q 1, Q 2) included in the DC-DC converter module 130 does not operate initially, the pre-charge switch included in the precharge circuit 120 (Q 5) is first operation. Then, when the high-voltage power supply V H is charged to a voltage higher than a certain level, the main switches Q 1 and Q 2 included in the DC-DC converter module 130 are driven, Converter 100 operates in either a boost mode or a buck mode.

However, the conventional precharge circuit 120 includes the inductor 124, which is not suitable for miniaturization of the entire system. The conventional non-insulated bidirectional DC-DC converter 100 includes a back-off switch 110. However, the pre-charge circuit 120 does not include a back-to-back switch and thus protects the pre-charge circuit from short- An additional back-to-back switch must be provided in the pre-charge circuit 120 in order to do so. However, if the back-to-back switch is additionally disposed in the pre-charge circuit 120 for the stability of the entire system, there is a problem that the whole system becomes large and the cost increases due to the additional components (that is, a back-to-back switch).

Korean Patent Publication No. 10-2010-0115087

It is an object of the present invention to provide a non-isolated bidirectional DC-DC converter including an improved pre-charge circuit suitable for miniaturization and reduction in circuit components.

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 non-isolated bidirectional DC-DC converter for performing bidirectional voltage conversion between a high voltage power source and a low voltage power source, A DC-DC converter module including a high voltage switch and a low voltage switch which are switching elements of the high voltage switch and the low voltage switch, and an inductor connected to the high voltage switch and the low voltage switch; And a pre-charge circuit for forming a pre-charge line for sharing the DC-DC converter module and the inductor, wherein the pre-charge circuit includes a pre-charge circuit having one end connected to the low- And a switch.

In the precharge switch, the drain may be electrically connected to the anode of the low voltage power source, and the source may be electrically connected to the inductor.

The precharge circuit may further include a first diode, wherein an anode of the first diode is electrically coupled to a source of the precharge switch, and a cathode of the first diode is coupled to the inductor.

The precharge circuit includes a capacitor whose one end is electrically connected to a line formed between the source of the precharge switch and the low power supply voltage and whose other end is connected to the ground and an anode is electrically connected to the line formed between the capacitor and the ground And a cathode is electrically connected to a line formed between the anode of the first diode and the source of the precharge switch.

The non-insulated bidirectional DC-DC converter may further include a back-to-back switch disposed between the high-voltage power supply and the high-voltage switch, the back-to-back switch being shared with the pre-charging circuit. In this case, the back-to-back switch protects the DC-DC converter module and the pre-charge circuit from an abnormal current.

The non-isolated bi-directional DC-DC converter is formed in a path between the inductor of the DC-DC converter module and the low voltage power source and is turned off when the pre-charge circuit operates to bypass current flow to the pre-charge line And further includes a relay switch.

The present invention realizes a non-isolated bidirectional DC-DC converter such that the inductor included in the DC-DC converter module is shared in the pre-charge circuit without placing an inductor in the pre-charge circuit, And the system can be miniaturized.

In addition, the present invention allows a back-to-back switch to be commonly used in the DC-DC converter module and the pre-charge circuit without disposing a separate back-to-back switch in the pre-charge circuit, It has the effect of protecting parts.

The present invention also has the advantage of minimizing system losses occurring in proportion to the number of switches and minimizing errors caused by switch control by reducing the number of switches used to protect the non-isolated bidirectional DC-DC converter.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention. And shall not be construed as limited to such matters.
1 is a diagram illustrating a conventional non-isolated bidirectional DC-DC converter with a pre-charge circuit and a back-lit switch.
2 is a diagram illustrating the configuration of a non-isolated bidirectional DC-DC converter including an improved precharge circuit, in accordance with an embodiment of the present invention.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating the configuration of a non-isolated bidirectional DC-DC converter including an improved precharge circuit, in accordance with an embodiment of the present invention.

2, a non-isolated bidirectional DC-DC converter 200 including an improved precharge circuit according to an embodiment of the present invention includes a high voltage power supply V H , a low voltage power supply V L , A plurality of DC-DC converter modules 220 and 230, a back-off switch 210, a plurality of relay switches (not shown), a plurality of sensors 251 and 255, a current sensor 256. 257, a plurality of capacitors 252, 253 and 254, Q h , Q i ), a precharge circuit 240, and a control module 260.

The high voltage power source (V H ) is a power supply device capable of charging and discharging with a voltage higher than the low voltage power source (V L ), a 48V battery may be adopted, and an ultracapacitor may be adopted. When the non-insulated bidirectional DC-DC converter 200 is driven, the high voltage power supply V H is electrically connected to the DC-DC converter modules 220 and 230 to apply power to a load device using a high voltage.

The low voltage power source (V L ) is a power source device which has a lower voltage than the high voltage power source (V H ) and can be charged and discharged, and a 12V battery or a 24V battery can be adopted. When the non-insulated bidirectional DC-DC converter 200 is driven, the low voltage power supply V L applies power to a load device using a low voltage or charges the high voltage power supply V H.

The capacitors 252, 253, and 254 are elements connected in parallel to the high voltage power supply V H and the low voltage power supply V L , respectively, to perform a voltage stabilization function, and an output smoothing capacitor may be used. The capacitor 252 connected in parallel with the high voltage power supply (V H ) may be grounded, and the other capacitors 253 and 254 may be grounded.

The relay switches Q h and Q i are formed in a connection path between the low voltage power source V L and the inductors L 1 and L 2 and are selectively turned on by the control module 260 so that the low voltage power V L ) and the DC-DC converter modules 220 and 230, respectively. The relay switches Q h and Q i are turned off when the pre-charge circuit 240 is driven to bypass the current flow to the pre-charge circuit 240. The relay switch Q h , Q i may be a metal oxide semiconductor field effect (MOSFET) switch as a semiconductor switch.

A voltage sensor (251, 255) measures the input / output voltage of the high voltage power source (V H) or the low voltage power source is connected to the (V L), the voltage or the low voltage power source of the high-voltage power supply (V H) (V L), the And transmits the measured voltage value to the control module 260. That is, the voltage sensor 251 is connected to the high voltage power source (V H) by sensing the input voltage or output voltage of the high voltage power source (V H), and passes the result of a sensing value to the control module 260, a low voltage power source ( V L ) senses an input voltage or an output voltage generated from the low voltage power source (V L ), and transmits the sensing result to the control module 260.

Among the plurality of current sensors 256 and 257, the high-voltage current sensor 256 connected to the high-voltage terminal side senses an input current or an output current generated in the high-voltage power supply V H and outputs the sensed current value to the control module 260 ). The low voltage current sensor 255 connected to the low voltage terminal senses an input current or output generated from the low voltage power source V L and transmits the sensed input current or output to the control module 260.

The DC-DC converter modules 220 and 230 operate in a boost mode or a buck mode according to a switching signal. That is, the DC-DC converter modules 220 and 230 move the current of the low voltage power source V L to the high voltage power source 210 by the switching signals S 1 to S 4 received from the control module 260 Operates in the boost mode or operates in a buck mode in which the current of the high voltage power supply (V H ) is moved to the low voltage power supply (V L ).

The DC-DC converter modules 220 and 230 include an inductor L 1 or L 2 that accumulates energy when a current flows, a current sensor 221 or 231, and a pair of switches Q a and Q b / Q c and Q d , respectively.

The pair of switches Q a and Q b / Q c and Q d included in the DC-DC converter modules 220 and 230 are connected to the high voltage switches Q a and Q c and the low voltage switches Q b and Q d , And each switch is turned on or turned off according to the switching signal received from the control module 260. (That is, the same DC-DC converter module 220 (230), which is included in) a low voltage switch (Q b, Q d) and the high-voltage switch (Q a, Q c) belonging to the same phase with each other operation complementarily. Low-voltage switch (Q b Or Q d is turned on, the low voltage switch Q b Or Q d) with the same DC-DC converter module ((the high-voltage switch included in the 220, 230) Q a Or Q c is turned off, and conversely the high voltage switch Q a Or Q c ) is turned on, the high voltage switch Q a Or Q c) with the same DC-DC converter module 220 (230), a low-voltage switch (Q b comprises a Or Q d is turned off.

When the current in a high voltage power source (V H) move at a low voltage power source (V L), the low voltage switch (Q b, Q d) are operating as the main switch, whereas the low voltage power from the high voltage power source (V H) (V L) when the current movement, and a high voltage switch (Q a, Q c) to act as a main switch. Preferably, each switch (Q a ~ Q d) has (Metal Oxide Semiconductor Field Effect) switch MOSFET as a semiconductor switch may be used.

Current sensors 221 and 231 included in the DC-DC converter modules 220 and 230 sense a current generated in the inductors L 1 and L 2 and transmit the sensed current to the control module 260.

The back-to-back switch 210 has two switches (Q e, Q f) is worked in such, a high voltage power supply (V H) and are series-connected, the high-voltage power supply (V H) and a high voltage switch (Q a, Q c) Respectively. That is, the source of the first switch Q e and the source of the second switch Q f constituting the back-lighting switch 210 are connected in series to form the back-lighting switch 210. The back-to-back switch 210 is shared by the DC-DC converter modules 220 and 230 and the pre-charging circuit 240 to generate an over-voltage or over-current, a noise signal, 200, and particularly protects the pre-charge circuit 240 from abnormal currents. That is, the back-to-back switch 210 is a high voltage power supply (V H) protect the short circuit, short-circuit of the low voltage power source (V L), electrical transient DC-DC converter module 220 (230) from the developer, etc., the precharge circuit 240, etc. do. A pair of switches Q e and Q f constituting the back-and-forth switch 210 may be a metal oxide semiconductor field effect (MOSFET) switch as a semiconductor switch.

The pre-charge circuit 240 forms a pre-charge line bypassed from the low voltage power supply V L to the inductors L 1 and L 2 of the DC-DC converter modules 220 and 230. That is, the pre-charge circuit 240 is connected in parallel with the positive polarity of the low voltage power supply V L and the output line is connected in parallel with the inductors L 1 and L 2 of the DC-DC converter modules 220 and 230 Charge line is formed.

Through the precharge circuit 240, the precharge circuit 240 uses the inductors L 1 and L 2 included in the DC-DC converter modules 220 and 230 together with the DC-DC converter modules 220 and 230 And the abnormal current is blocked by the back-to-back switch 210 connected in series with the high voltage power source (V H ).

The precharge circuit 240 includes a pre-charge switch (Q g), a plurality of diodes 241, 242 and capacitor 243.

The capacitor 243 performs a voltage stabilization function and a smoothing capacitor can be used. One end of the capacitor 243 is electrically connected to a line formed between the drain of the precharge switch Q g and the low voltage power supply V L and the other end of the capacitor 243 is connected to the ground.

A precharge switch (Q g) is a semiconductor switch such as a MOSFET, the drain of the pre-charge switch (Q g) is electrically connected to the anode of the low voltage power source (V L), the source of the precharge switch (Q g) is the the inductor via the first diode 241 is (L 1, L 2) and electrically connected. That is, the source of the precharge switch Q g is connected to the anode of the first diode 241, and the cathode of the first diode 241 is connected to the inductors L 1 and L 2 .

The first diode 241 and the second diode 242 are installed in the precharge circuit 240 to flow a current in a constant direction. The anode of the first diode 241 is electrically connected to the source of the precharge switch Q g and the cathode of the first diode 241 is connected to the inductors L 1 , L 2 and is used in common by the precharging circuit 240 as the inductors L 1 and L 2 .

The anode of the second diode 242 is electrically connected to the line formed between the capacitor 243 and the ground and the cathode of the second diode 242 is connected to the source of the precharge switch Q g and the first diode 241, respectively.

When the precharge switch Q g is turned off, the second diode 242 is connected to the first diode 241 together with the closed loop circuit (the inductor L 1 , L 2 ) -> the high voltage switch Q a , Q c ) -> back-to-back circuit 210 -> high voltage power supply V H ->ground-> second diode 242 -> first diode 241) to form inductor L flow the energy stored in the 1, L 2) to a high voltage power source (V H) and charges the high-voltage power supply (V H).

The first diode 241 blocks the reverse current and when the precharge switch Q g is turned on, the first diode 241 receives the current from the precharge switch Q g and supplies the current of the low voltage power supply V L to the inductor L 1 , L 2 ) to accumulate the energy of the inductors (L 1 , L 2 ). The first diode 241 forms a closed loop circuit together with the second diode 242 when the precharge switch Q g is turned off so that the energy accumulated in the inductors L 1 and L 2 Voltage power supply (V H ).

A precharge switch (Q g) of the precharge circuit 240 is on / off based on a PWM (Pulse Width Modulation) signal (signal S 6) generated by the control module 260. When the control module 260 generates a turn-on signal, the precharge switch Q g is turned on to supply the current of the low voltage power source V L to the inductors L 1 and L of the DC-DC converter modules 220 and 230 2 so that energy is accumulated in the inductors L 1 and L 2 . That is, the pre-charge circuit 240 transfers the current to the inductors L 1 and L 2 used in common with the DC-DC converter modules 220 and 230, so that the energy in the inductors L 1 and L 2 To accumulate.

In addition, when the precharge switch (Q g) that is turned off by the control module 260, the second diode 242 and the first diode (241) forms a closed loop circuit, an inductor (L 1, L 2 ) by the energy stored in the power to be delivered to the high-voltage (V H), and charges the high-voltage power supply (V H).

The control module 260 is a control device that controls each switch, and in particular, determines the drive mode of the pre-charge circuit 240 and the drive mode (buck mode or boost mode) of the DC-DC converter modules 220 and 230. The control module 260 applies a PWM signal to the gates of the respective switches as switching signals S 1 to S 8 to control the operation of the switches. The control module 260 also controls the DC-DC converter modules 220, 220 and 230 based on the current sensing values and the voltage sensing values obtained from the respective voltage sensors 251, 255 and the current sensors 221, 231, 256, 230 and whether or not the precharge circuit 240 operates.

The control module 260 continuously monitors the voltage value received from each of the voltage sensors 251 and 255 and performs pre-charge if it is determined that the voltage of the high voltage power source V H falls below a predetermined threshold value do. At this time, the control module 260 generates a switching signal for stopping the operation of all the DC-DC converter modules 220 and 230, and connects the low-voltage power source V L and the connecting path of the DC-DC converter modules 220 and 230 And generates a switching signal to turn off the relay switches Q h and Q i . In addition, the control module 260 generates a switching signal (S 6) for driving the precharge circuit 240 and the back-to-back switch 210. That is, the control module 260 to drive the precharge circuit 240, a precharge switch (Q g) to the PWM signal (S 6) the generation by the precharge switch (Q g) are alternately is turned off and turned on And also generates a control signal S 5 for turning on the pair of switches Q e and Q g included in the back-to-back switch 210 and controls the DC-DC converter modules 220 and 230 And generates switch signals S 7 and S 8 that turn off the relay switches Q h and Q i formed on the line between the low voltage power supply V L. According to this switching control, the current path is bypassed to the pre-charge circuit 240 so that the current of the low voltage power supply V L is included in the DC-DC converter modules 220 and 230 via the pre-charge circuit 240 the inductor is transmitted to the (L 1, L 2), and the energy in the inductor (L 1, L 2) stored, the stored energy in the inductor (L 1, L 2) is passed to the high-voltage power supply (V H) high-voltage power supply (V H ).

Meanwhile, the control module 260 receives the current sensing value from each of the current sensors 256, 257, 221, and 231 even while the pre-charge is in progress, and outputs the current sensing value to the DC-DC converter modules 220 and 230 A current indicated by the high voltage power supply V H and a current appearing in the low voltage power supply VL to control charging and discharging through the precharge circuit 240.

In addition, the control module 260 monitors the high voltage power supply V H through the voltage sensor 251 connected to the high voltage power supply V H , and when the voltage of the high voltage power supply V H reaches the normal range, Stop charging. That is, when the high voltage power supply V H reaches the normal range, the control module 260 does not operate the precharge switch Q g (that is, keeps the precharge switch in the turn off state) DC converter modules 220 and 230, and controls switching of one or more DC-DC converter modules 220 and 230 to operate in a buck mode or a boost mode. At this time, the control module 260 generates the switching signals S 7 and S 8 that turn on the switches Q h and Q i connected to the driving determined phase among the relay switches Q h and Q i , DC converter modules 220 and 230 and the low voltage power source V L.

As described above, the non-insulated bidirectional DC-DC converter 200 according to an embodiment of the present invention includes inductors L 1 and L 2 included in the DC-DC converter modules 220 and 230, So as to reduce the number of inductors and miniaturize the system as compared with the conventional non-insulated bi-directional DC-DC converter. In addition, the non-isolated bidirectional DC-DC converter 200 according to an embodiment of the present invention is implemented such that the back-to-back switch 240 is commonly used in the pre-charge circuit 240, .

Although the non-isolated bidirectional DC-DC converter 200 has been described as a two-phase type including two DC-DC converter modules 220 and 230 in the above-described embodiment, the present invention is not limited thereto, The present invention can be applied to a non-insulated bidirectional converter including the above-described DC-DC converter module.

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 invention. The present invention is not limited to the drawings.

200: Non-isolated bidirectional DC-DC converter
210: Back-to-back switch
220, 230: DC-DC converter module
240: Precharge circuit
251, 255: voltage sensor
252, 253, 254: capacitors
221, 231, 256, 257: current sensor
260: Control module

Claims (7)

1. A non-isolated bidirectional DC-DC converter for performing bidirectional voltage conversion between a high voltage supply and a low voltage supply,
A DC-DC converter module including a high voltage switch and a low voltage switch, which are a pair of switching elements which are switched to 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; And
And a pre-charge circuit for forming a pre-charge line for sharing the DC-DC converter module and the inductor,
Wherein the precharge circuit includes a precharge switch having one end connected in parallel with the low voltage power supply and the other end connected in parallel with the inductor. The method according to claim 1,
The precharge switch includes:
Drain is electrically connected to the anode of the low voltage power source, and a source is electrically connected to the inductor. 3. The method of claim 2,
Wherein the precharge circuit further comprises a first diode,
Wherein the anode of the first diode is electrically coupled to the source of the precharge switch and the cathode of the first diode is coupled to the inductor. The method of claim 3,
The precharge circuit includes:
A capacitor having one end electrically connected to a line formed between the source of the precharge switch and the low power supply voltage and the other end connected to ground; And
And a second diode electrically connected to a line formed between the capacitor and the ground and having a cathode electrically connected to a line formed between an anode of the first diode and a source of the precharge switch, Non-isolated bidirectional DC-DC converter. 5. The method according to any one of claims 1 to 4,
And a back-to-back switch disposed between the high-voltage power supply and the high-voltage switch and used in the pre-charging circuit,
Wherein the back-lit switch protects the DC-DC converter module and the pre-charge circuit from an abnormal current. 5. The method according to any one of claims 1 to 4,
The precharge circuit includes:
DC converter according to claim 1, wherein the non-isolated bidirectional DC-DC converter operates when the voltage of the high voltage power supply drops below a threshold value. 5. The method according to any one of claims 1 to 4,
A relay switch formed in a path between the inductor of the DC-DC converter module and the low-voltage power supply, the relay switch being turned off when the pre-charge circuit operates to bypass current flow to the pre-charge line; Wherein the DC-DC converter is a DC-DC converter.
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CN110176857B (en) * 2019-06-20 2024-04-09 中国重型机械研究院股份公司 Rectifier unit precharge circuit capacity-increasing circuit and construction method thereof

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JP2002112534A (en) * 2000-09-28 2002-04-12 Toyota Industries Corp Dc-dc converter
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220190734A1 (en) * 2020-12-15 2022-06-16 Hyundai Mobis Co., Ltd. Bidirectional insulating dc-dc converter, control apparatus therefor, and operating method thereof
US11870360B2 (en) * 2020-12-15 2024-01-09 Hyundai Mobis Co., Ltd. Bidirectional insulating DC-DC converter, control apparatus therefor, and operating method thereof

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