KR20180074300A - battery integrated bidirectional DC-DC converter for 48V mild hybrid vehicle - Google Patents

Abstract

Disclosed is an integrated power supply device. The present invention provides a battery integrated bidirectional DC-DC converter for a 48V mild hybrid which integrally configures a 48V energy storage part and a DC/DC converter part mounted on a mile hybrid vehicle and integrally designs a control part of the 48V energy storage part and a control part of the DC/DC converter part. The integrated power supply device comprises: a power part of a DC/DC converter arranged between a high voltage source and a low voltage battery lower than the high voltage source and between the high voltage source and an electric field load; a first cell module connected between the high voltage source and the DC/DC converter; and a power supply pack control module integrating a control part of a battery management system managing the first cell module and the control part of the DC/DC converter.

Description

[0001] The present invention relates to a battery integrated bidirectional DC-DC converter for 48V mild hybrid,

[0001] The present invention relates to an integrated power supply device, and more particularly, to an integrated power supply device in which a 48V energy storage unit and a DC / DC converter unit mounted in a mild hybrid vehicle are integrally formed and a control unit of a 48V energy storage unit and a control unit of a DC / DC-DC converter for a 48V mild hybrid.

The prior art in this field will be described.

According to Publication No. 10-2016-0087363, a bi-directional DC-DC power converter for a vehicle system, a bi-directional DC-DC power converter assembly is disclosed that processes and transmits differential power in a variable manner. The converter assembly includes a first converter section coupled to the energy storage device and a second converter section coupled to the DC link and the energy storage device. The converter assembly is operable to provide power to the load When processing the first portion of the DC power output of the energy storage device and providing the unprocessed second portion of the DC power output of the energy storage device to the second converter section and providing regenerative power to the energy storage device, Processes the first part of the regenerative power from the load and provides the unprocessed second part of the regenerative power from the load to the first converter section " There.

Publication No. 10-2016-0087363 (bi-directional DC-DC power converter for vehicle systems)

The mild hybrid vehicle has a 48V power supply added to the existing 12V power supply, so the 48V power generation part, the energy storage part, and the DC / DC converter for the existing 12V power supply are newly constructed.

It is necessary to develop a product that integrates a 48V energy storage unit and a DC / DC converter so that power supply can be steadily maintained and efficiently managed in keeping with the recent developments in the field of automotive electric fields where power consumption in a vehicle is rapidly increasing. have.

In order to meet the above-mentioned need, the present invention is a system for integrating a 48V energy storage unit and a DC / DC converter unit mounted in a mild hybrid vehicle and integrally designing a control unit of the 48V energy storage unit and a control unit of the DC / The present invention provides a one-way DC-DC converter integrated with a battery for a 48V mild hybrid.

According to an aspect of the present invention, there is provided a power unit for a DC-DC converter arranged between a high-voltage source and a low-voltage battery having a voltage lower than the high-voltage source, A first cell module coupled between the high voltage source and the DC / DC converter; And a DC / DC converter of a 48V-12V integrated power supply including a control unit of a battery management system for managing a first cell module and a power pack control module incorporating a control unit of a DC / DC converter.

The DC / DC converter is provided with a switching device MOSFET instead of a reflux diode which is connected in parallel between a high voltage source and a low voltage load; And the MOSFET functions as a synchronous switching rectifier.

According to the embodiment, when the MOSFET switch is attached to the DC / DC converter instead of the DIODE for synchronous switching, the BUCK converter operates at the high voltage portion and the BOOST converter operates at the low voltage portion.

According to the embodiment, the DC / DC converter is a phase shift type switching circuit. The inductor and the reflux diode are formed in each switching element of the MOSFET by a step-down converter circuit.

According to the embodiment, the DC / DC converter includes a coupled inductor in which at least two coils are wound around the same core.

According to the embodiment, the DC / DC converter controls the duty by applying a PWM signal to the MOSFET M1, switches the return path by applying a synchronizing signal to the MOSFET M7, And the phase is shifted to the control.

According to an embodiment, the integrated power supply includes an integrated control module, an integrated control module, a cell relay array, a switch driver and a sensor, cell modules, and a power converter module , The integrated control module integrates the control unit of the 48V energy storage unit and the control unit of the DC / DC converter, and the integrated control module may be referred to as a battery cell and a DC / DC converter controller And monitors and controls the 48V and 12V power, performs functions of a DC / DC converter power converter and a BMS controller using a cell relay array, a switch driving unit and a sensor, and the cell relay array is connected to a plurality of cells Each of the plurality of relays includes a plurality of relays connected to the plurality of relays, each of the plurality of relays activating, deactivating, or connecting the redundant cells according to on / The switch driving section and the sensor include a gate drive and sensor. The switch driving section and the sensor detect the operation of the switches of the DC / DC converter according to the output voltage or the output current of the DC / DC converter sensed by the sensor Wherein the cell module includes a high voltage battery including a 48V battery and a low voltage battery including a 12V battery, the low voltage battery includes a lithium ion battery, and the power conversion module transmits the power of the 48V battery to 48V-12V power Converts the power of the 12V battery into electric power and supplies it to the PWM inverter of the vehicle BSG in response to the control of the integrated control module.

In an embodiment, a blowing fan is provided between the DC / DC converter of the integrated power unit and the battery, and the blowing fan discharges the outside air sucked from one side of the integrated power source device to the other side of the integrated power source device, And to perform cooling of the integrated power supply including the DC / DC converter.

According to the present invention, by using a module in which a 48V battery, a 12V battery, and a bidirectional DC / DC converter are integrated, it is possible to unify the battery and converter cooling structure and integrally manage the batteries, thereby miniaturizing and lighter the power package There is an advantage.

In addition, according to another embodiment of the present invention, the number of output inductors of the bidirectional DC / DC converter can be reduced by using a coupled inductor, thereby reducing the system volume and cost.

1 is an illustration of a typical electrical / electronic (E / E) architecture of a conventional 12V / 48V dual power system capable of employing an integrated power supply according to the present invention.
2 is a power system diagram of a driving unit and an energy storage unit of the WRSM BSG of the comparative example.
3 is a conceptual diagram of a 48V-12V integrated power supply (hereinafter simply referred to as an integrated power supply) according to an embodiment of the present invention.
4 is a block diagram of the integrated power supply of FIG.
5 is a conceptual diagram of an integrated power supply apparatus according to another embodiment of the present invention.
6 is a block diagram of a DC / DC converter that may be employed in an integrated power supply according to another embodiment of the present invention.
FIG. 7 is a diagram illustrating a couple inductor that may be included in FIG.
FIG. 8 is a block diagram illustrating a cooling structure of a battery-integrated bidirectional DC / DC converter according to an embodiment of the present invention; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

 However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. The embodiments of the present invention are provided to explain the present invention more fully to those skilled in the art. Therefore, the shapes and the like of the elements in the drawings may be exaggerated in order to emphasize a clearer description, and elements denoted by the same reference numerals in the drawings may denote the same elements.

1 is an illustration of a typical electrical / electronic (E / E) architecture of a conventional 12V / 48V dual power system capable of employing an integrated power supply according to the present invention.

Referring to FIG. 1, a 12V / 48V dual power system of a vehicle 2 capable of employing the integrated power supply according to the present invention includes a 12V battery, a DC / DC converter, a 48V battery, an inverter, / Generator (M / G).

While the alternator of the existing 12V system is for power generation, the 48V system can realize the mild hybrid system by using the increased power generation motor (M / G) Engine driving force assist, and idle stop & go (ISG) function when the vehicle stops.

In order to improve engine power output, torque assist and ISG performance while applying 48V Mild-HEV (hybrid electric vehicle) system, high power generation motor can be applied as Permanent Magnetic Synchronous Machine, Wounded Rotor Synchronous Machine).

In addition, the 48V Mild-HEV system is directly connected to the engine and belt, and because the field is a permanent magnet, the PWM (pulse width modulation) In order to solve this problem, there are difficult problems such as weak field control at high speed operation, low efficiency point operation and high back electromotive force limitation. In order to solve this problem, a belt driven (BSG) method using a wounded rotor synchronous motor (WRSM) Starter & Generator machines. When WRSM BSG is applied, separate inverter and field current drive logic and circuit are required.

In the case of the 48V Mild-HEV system, if the field magnet is permanent magnet, it can generate 48V only by rotating the engine. However, if the field power is not supplied in the WRSM power generation system, If the 48V battery is discharged or malfunctioned, the 12V system will not be able to supply power and the vehicle will not be able to operate at all.

Therefore, when the DC / DC converter is boosted through a 12V battery, this power can be used to recharge the discharged 48V by supplying current to the WRSM field.

As described above, in the vehicle capable of employing the integrated power supply device of the present embodiment, the BSG machine and the PWM inverter for driving it, the 48V storage device, the 48V / 12V bidirectional DC / DC converter, the 12V storage The device should be included as a major power component.

2 is a power system diagram of a driving unit and an energy storage unit of the WRSM BSG of the comparative example.

Referring to FIG. 2, the driving unit of the WRSM BSG of the comparative example includes a BSG and a PWM inverter, and supplies power to the high voltage battery 50p and the bidirectional DC / DC converter 10p. The bidirectional DC / DC converter 10p converts the power of the PWM inverter to supply power to the low-voltage battery 60p and the full-system load. Further, the power of the low-voltage battery is boosted through the bi-directional DC / DC converter 10p as needed and supplied to the PWM inverter.

The high voltage battery 50p generally refers to a 48V battery and includes a battery management system controller (BMS controller), a cell relay array and cell modules, As shown in FIG.

The low voltage battery 60p generally refers to a 12V battery and includes a DC / DC controller, a switch driver and a sensor (gate driver & sensor) and a power converter module and supplies power to the vehicle's 12V power network do.

3 is a conceptual diagram of a 48V-12V integrated power supply (hereinafter simply referred to as an integrated power supply) according to an embodiment of the present invention.

Referring to FIG. 3, the integrated power supply 100 according to the present embodiment has an integrated structure of the bidirectional DC / DC converter 10 and the high voltage battery 50. The bidirectional DC / DC converter 10 and the high voltage battery 50 will be described in detail in FIGS. 4 and 5 below.

The bidirectional DC / DC converter 10 basically has a different structure (see FIG. 7) from the bidirectional DC / DC converter 10p of FIG. 2, but may have a structure similar to the bidirectional DC / have.

Thanks to the development of power semiconductor technology, the BSG machine and PWM inverter can be integrated, integrated with 48V energy storage device (or battery) and unidirectional DC / DC converter, integrated with BMS (Battery Management System) ≪ / RTI >

On the other hand, even if the 48V-12V DC / DC converter and the 48V energy storage device are integrated, the 12V battery for securing the power stability of the existing 12V power supply system still needs to be used and it can be constituted using the existing lead-acid battery. However, unlike conventional internal combustion engines, where the 12V power system plays a major role, the 48V Mild-HEV car is powered by a 48V power system and provides 12V power through a DC / DC converter.

Therefore, in this embodiment, since the power consumption of the 12V electric field load is limited and there is no high output load, the 12V class energy storage device is realized by minimizing the capacity of the 12V class battery and applying the lithium class battery which is more compact and lightweight.

In addition, a 12V class energy storage device is integrated with a 48V energy storage device and a bidirectional DC / DC converter to provide an integrated control module capable of improving vehicle package and efficiently operating.

The operation of the mild hybrid electric vehicle (MHEV) employing the integrated power supply 100 of the present embodiment will be described. The integrated power supply for the mild hybrid electric vehicle includes a bidirectional DC / DC converter 10, And performs a step-down operation and a step-up operation between a PWM (pulse width modulation) inverter and a low-voltage battery and an electric system load through a DC / DC converter 10.

In the step-down type operation, the DC / DC converter 10 transforms AC (alternating current) power generated in a belt driven starter generator (BSG) motor connected to the engine and the belt to direct current (DC) power through a PWM inverter. Further, it can charge the high-voltage battery 50, can charge the low-voltage battery by transforming the high voltage input to the DC / DC converter 10 to the low voltage, and can supply electric power to the electric system load.

In the boost operation, the DC / DC converter 10 can boost the low voltage input from the low voltage battery 12V to supply power to the PWM inverter. Whereby the DC / DC converter 10 can drive the motor.

Hereinafter, the operation of the DC / DC converter 10 will be described.

As shown in Equation 1, the output voltage of the BUCK converter, which is a step-down DC / DC converter, is determined by the duty ratio.

(D: duty ratio, V _L : low voltage, V _H : high voltage)

Since the output voltage Vo is generally set to 13.9 V, the duty ratio changes according to the change of the input voltage. For example, when the input voltage is 36V, D = 0.3861 and when 60V is D = 0.2574. The higher the input voltage is, the lower the duty ratio D becomes, but the circuit configuration is simple and widely used.

As shown in Equation 2, the output voltage is determined by the duty ratio of the BOOST converter, which is a step-up DC / DC converter.

(D: duty ratio, V _L : low voltage, V _H : high voltage)

The DC / DC converter is provided with a switching element MOSFET instead of the reflux diode connected in parallel between the 48V high voltage terminal and the 12V low voltage terminal. When the MOSFET (SW_L) is applied instead of the conventional diode, However, when the MOSFET is gated, there is no forward voltage drop and the loss is greatly reduced. Therefore, the loss of the reflux diode is much larger than the loss occurring when the MOSFET is actually turned off. At this time, the MOSFET functions as a synchronous switching rectifier. When a MOSFET switch is attached instead of DIODE for synchronous switching, a BUCK-BOOST converter can be simultaneously operated. When a PWM signal is applied to the MOSFET, a boost operation is performed.

Further, in the present embodiment, the DC / DC converter 10 may have a two-phase full bridge structure using a coupled inductor (see 40 in FIG. 7) (see FIG. 6). The use of a coupled inductor has the advantage of reducing the number of output inductors, making the system smaller and lighter, and lowering the cost of the device.

4 is a block diagram of the integrated power supply of FIG.

Referring to FIG. 4, the integrated power supply 100 according to the present embodiment includes an integrated control module 110, a cell relay array 120, a switch driver and a sensor 130, a cell module cell modules 140, and a power converter module 150.

The integrated control module 110 integrates the control unit of the 48V energy storage unit and the control unit of the DC / DC converter. The integrated control module 110 may be referred to as a battery cell and a DC / DC converter controller, and may monitor and control 48 V and 12 V power, and may include a cell relay array 120, The sensor 130 may be used to perform the functions of the DC / DC converter power conversion unit and the BMS control unit.

The cell relay array 120 includes a plurality of relays respectively connected to a plurality of cells in the cell module 140 and may enable or disable each cell or connect redundant cells according to on- And may be implemented to select serial and / or parallel connections of cells depending on the implementation.

The switch driver and sensor 130 may include a gate drive and a sensor. The switch driving unit and the sensor 130 can control the operation of the switches of the DC / DC converter according to the output voltage or the output current of the DC / DC converter sensed by the sensor.

The cell module 140 includes a high voltage battery including a 48 V battery and a low voltage battery including a 12 V battery. The low voltage battery may include a lithium ion battery.

The power conversion module 150 converts the power of the 48V battery to 48V-12V power and supplies the converted power to the vehicle full-length portion. In addition, the power converter module 150 can increase the power of the 12V battery in response to the control of the integrated control module 110 and supply it to the PWM inverter of the vehicle BSG.

According to the present embodiment, the battery and the converter cooling structure can be integrated, the at least two kinds of batteries can be integratedly managed, and the device / The package can be miniaturized.

5 is a conceptual diagram of an integrated power supply apparatus according to another embodiment of the present invention.

Referring to FIG. 5, the integrated power supply unit according to the present embodiment can integrate a 48V battery system, a 12V battery system, and a bidirectional DC / DC converter 10 to implement an integrated power supply unit (see shaded area).

This integrated power supply or integrated control module powers the vehicle's 48V high power consumer and the 48V starter / generator / alternator and DC / DC converter (10). The integrated control module provides high voltage (high voltage 48V in vehicle) to high booster consumer eBooster, EPS / EHPS, Roll Stabilization, PTC heater, electric pump and AC compressor. Can be supplied.

In addition, the integrated control module can supply the output of a DC / DC converter and / or the output of a 12V battery pack to a conventional 12V vehicle network (classic 12V boardnet).

6 is a block diagram of a DC / DC converter that may be employed in an integrated power supply according to another embodiment of the present invention. The integrated power supply according to this embodiment may include an integrated power supply for MHEV, But is not limited thereto.

6, the integrated power supply according to the present embodiment includes a DC-DC converter (not shown) disposed between a high voltage source and a low voltage battery and / or between a high voltage source and a load, A control unit 20 for controlling the DC-DC converter 10, and a sensor 30. The control unit 20 controls the DC-

The high voltage source may include a PWM inverter connected to the BSG and / or a high voltage battery rated at 48V. The low-voltage battery may have a rated voltage of 12V, and the load may include the vehicle's electrical system.

The DC-DC converter 10 may include twelve switches M ₁ to M ₁₂ and three coupled inductors L ₁ , L ₂ and L ₃ . An input capacitor C _i may be disposed between the DC-DC converter 10 and the high voltage source and an output capacitor C _o may be disposed between the DC-DC converter 10 and the low voltage battery and the load.

The first switch M ₁ , the second switch M ₂ , the seventh switch M ₇ and the eighth switch M ₈ of the DC-DC converter 10 are connected through the first couple inductor L ₁ And constitutes a two-phase full bridge and is connected to the first terminal of the output capacitor (C _o ). Here, the first terminal of the first switch and the first terminal of the second switch are connected to the first terminal of the input capacitor C _i , the second terminal of the seventh switch and the second terminal of the eighth switch are connected to the input capacitor (C _i ) and the second terminal of the output capacitor (C _o ). The second terminal of the first switch and the first terminal of the seventh switch are connected to each other, and the connection node thereof is connected to one end of the first coil of the first coupled inductor (L ₁ ).

The second terminal of the second switch and the first terminal of the eighth switch are connected to each other, and the connection node is connected to one end of the second coil of the first coupled inductor (L ₁ ). And the other end of the first coil and the other end of the second coil are connected to the first terminal of the output capacitor C _o .

The third switch M ₃ , the fourth switch M ₄ , the ninth switch M ₉ and the tenth switch M ₁₀ of the DC-DC converter _{10 are} connected via the second coupled inductor L ₂ And constitutes a two-phase full bridge and is connected to the first terminal of the output capacitor (C _o ). Here, the second terminal of the second terminal and the tenth switches on the first terminal and the first terminal of the fourth switch input is connected to a first terminal of the capacitor (C _i), the ninth switch of the third switch input capacitor (C _i ) and the second terminal of the output capacitor (C _o ).

The second terminal of the third switch and the first terminal of the ninth switch are connected to each other, and the connection node thereof is connected to one end of the first coil of the second coupled inductor (L ₂ ). Further, the second terminal of the fourth switch and the first terminal of the tenth switch are connected to each other, and the connection node thereof is connected to one end of the second coil of the second coupled inductor (L ₂ ). In the second coupled inductor L ₂ , the other end of the first coil and the other end of the second coil are commonly connected to the first terminal of the output capacitor C _o .

The fifth switch M ₅ , the sixth switch M ₆ , the eleventh switch M ₁₁ and the twelfth switch M ₁₂ of the DC-DC converter 10 are connected via the third coupled inductor L ₃ And constitutes a two-phase full bridge and is connected to the first terminal of the output capacitor (C _o ). Here, the first terminal is connected to a first terminal of the input capacitor (C _i), the second terminal of the second terminal and a twelfth switch, the eleventh switch of the first terminal of the sixth switch, the fifth switch input capacitor (C _i ) and the second terminal of the output capacitor (C _o ).

The second terminal of the fifth switch and the first terminal of the eleventh switch are connected to each other, and the connection node thereof is connected to one end of the first coil of the third coupled inductor (L ₃ ). Further, the second terminal of the sixth switch and the first terminal of the twelfth switch are connected to each other, and the connection node thereof is connected to one end of the second coil of the third coupled inductor (L ₃ ). The other end of the first coil of the third coupled inductor L ₃ and the other end of the second coil are commonly connected to the first terminal of the output capacitor C _o .

With the above-described configuration, the DC-DC converter 10 can convert the input voltage Vi to output the output voltage Vo, and vice versa.

The control unit 20 may include a two-phase full bridge control loop. The two-phase full bridge control loop may be implemented as a switch driver for controlling switches of two-phase full bridges connected to the first to third coupled inductors L ₁ , L ₂ and L ₃ , respectively. Such a switch driving unit can be easily derived based on the detailed description of this specification and the accompanying drawings, and a detailed description thereof will be omitted here.

The sensor 30 is coupled to the first to third coupled inductors L ₁ , L ₂ and L ₃ to detect a current or voltage in each coupled inductor. The sensor 30 may include a first sensor, a second sensor, and a third sensor coupled to the first through third coupled inductors L ₁ , L ₂ , and L ₃ , respectively. The first sensor, the second sensor and the third sensor may be coupled between the output terminal of each coupled inductor and the first terminal of the output capacitor and the output capacitor C _o . The signal detected by the sensor 30 may be directly transmitted to the control unit 20. [ The sensor 30 described above may include a voltmeter, an ammeter, a power meter, or a combination thereof.

In the DC / DC converter of the present invention, a phase shift type switching circuit is applied. The inductor and the reflux diode are constituted by a step-down converter circuit in each switching element of the MOSFET.

For example, L1 is connected in series with MOSFET 1 (M1), D1 is connected in parallel, and M2, M3, M4, M5, and M6 are also connected.

When the PWM switching is switched at the same duty ratio with 360 / n phase interval, the output current appears superimposed on the voltage generated by each switching, and the DC component and the AC component of the output current are similar, And the size is greatly reduced.

Therefore, the Duty is controlled by the M1 PWM signal, the reflux path is switched to the M7 synchronous signal, and the phase is controlled in the order of M1 → M2 → M3 → M4 → M5 → M6.

Fig. 7 is an illustration of a couple inductor that can be employed in the integrated power supply of Fig. 6;

Referring to FIG. 7, the coupled inductor 40 according to the present embodiment includes an annular core 43 and a first coil 41 and a second coil 42 wound on both sides of the core 43.

One end of the first coil 41 may be connected to a lead stage of the current or voltage phase in the two-phase full bridge and a leading output stage of the lag stage. The other end of the first coil 41 may be connected to the first terminal of the output capacitor.

One end of the second coil 42 may be connected to the lead stage of the current or voltage phase in the two-phase full bridge and the outgoing output stage of the rack page. The other end of the second coil 42 may be connected to the first terminal of the output capacitor in common with the other end of the first coil 42.

The core 43 is referred to as an iron core, a magnetic core, a magnetic iron core, or the like, and refers to a kind of ferromagnetic material having a high magnetic permeability. The core 43 can be used to limit the range of magnetic fields in electrical or magnetic devices.

In the above-described embodiment, the number of output inductors is reduced in the DC / DC converter by using three couple inductors and controlling the operation of the switches so that the magnetic flux of the couple inductor is parallel to reduce the volume of the system and reduce the cost .

Also, in the case of using one inductor per phase, six inductors are required for six phases, and the inductor is a structure in which a coil is wound around a magnetic core. The core must form a closed loop.

Therefore, in order to construct six inductors, six coils are required for at least six magnetic cores, and a couple inductor is formed by winding two coils around one magnetic core, and two or more coils .

8 is a diagram illustrating an embodiment in which a 48V battery and a DC / DC converter are disposed and an air blower is installed therebetween to implement a cooling function of the integrated power supply device.

As shown in the figure, a blowing fan is provided between the DC / DC converter of the integrated power unit and the battery, and the blowing fan discharges the external air sucked from one side of the integrated power source device to the other side of the integrated power source device, And performs cooling of the integrated power supply including the DC / DC converter.

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

10: DC / DC converter
20:
30: Sensor
40: Couple inductor
100: Integrated power supply

Claims (7)

A power portion of a DC-DC (DC / DC) converter arranged between a high voltage source and a low voltage battery and an electric load of a voltage lower than the high voltage source; A first cell module coupled between the high voltage source and the DC / DC converter; And a power pack control module incorporating a controller of a battery management system for managing the first cell module and a controller of the DC / DC converter, the DC / DC converter of the 48V-
Wherein the DC / DC converter is provided with a switching element MOSFET instead of a reflux diode connected in parallel between the high voltage source and the low voltage load, and the MOSFET functions as a synchronous switching rectifier. -DC converter.
The method according to claim 1,
Wherein when the MOSFET switch is attached to the DC / DC converter instead of the DIODE for synchronous switching, the BUCK-BOOST converter is simultaneously operated and a PWM signal is applied to the MOSFET to perform a boost operation. -DC converter.
The method according to claim 1,
The battery-integrated bidirectional DC-DC converter for a 48V mild hybrid is characterized in that an inductor and a reflux diode are formed in each switching element of the MOSFET, wherein the DC / DC converter is a phase shift type switching circuit.
The method according to claim 1,
Wherein the DC / DC converter includes a coupled inductor in which at least two coils are wound around the same magnetic core. The battery-integrated bidirectional DC-DC converter for a 48V mild hybrid.
The method according to claim 1,
The DC / DC converter controls the duty by applying a PWM signal to the MOSFET M1, switches the return path by applying a synchronizing signal to the MOSFET M7, and shifts the phases in order of M1, M2, M3, M4, M5, and M6 DC-DC converter for a 48V mild hybrid.
The method according to claim 1,
The integrated power supply includes an integrated control module, a cell relay array, a switch driver and a sensor, cell modules, and a power converter module,
The integrated control module integrates a control unit of the 48V energy storage unit and a control unit of the DC / DC converter, and the integrated control module may be referred to as a battery cell and a DC / DC converter controller , 48V and 12V power, performs functions of DC / DC converter power converter and BMS controller using cell relay array, switch driver and sensor,
The cell relay array includes a plurality of relays respectively connected to a plurality of cells in a cell module, and activates, deactivates, or connects redundant cells according to ON / OFF operations of the plurality of relays,
The switch driver and the sensor include a gate drive and a sensor. The switch driver and the sensor sense the operation of the switches of the DC / DC converter according to the output voltage or the output current of the DC / DC converter sensed by the sensor Control,
The cell module includes a high voltage battery including a 48V battery and a low voltage battery including a 12V battery, the low voltage battery includes a lithium ion battery,
The power converter module converts the power of the 48V battery to 48V-12V power and supplies the power to the vehicle electrical field part. The power converter module boosts the power of the 12V battery in response to the control of the integrated control module, To-DC converter for a 48V mild hybrid. The method according to claim 1,
A blower fan is provided between the DC / DC converter of the integrated power unit and the battery. The blower fan discharges the external air sucked from one side of the integrated power unit to the other side of the integrated power unit, DC-DC converter for a 48V mild hybrid.

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