KR101157429B1 - Synchronous boost dc/dc converter and fuel cell system comprising the same - Google Patents

Synchronous boost dc/dc converter and fuel cell system comprising the same Download PDF

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Publication number
KR101157429B1
KR101157429B1 KR1020110113259A KR20110113259A KR101157429B1 KR 101157429 B1 KR101157429 B1 KR 101157429B1 KR 1020110113259 A KR1020110113259 A KR 1020110113259A KR 20110113259 A KR20110113259 A KR 20110113259A KR 101157429 B1 KR101157429 B1 KR 101157429B1
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KR
South Korea
Prior art keywords
switching element
voltage
current
synchronous
boost
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KR1020110113259A
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Korean (ko)
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박도현
신민호
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(주)에이알텍
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/10Emergency 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
    • H02H7/12Emergency 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
    • H02H7/1213Emergency 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/18Emergency 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 batteries; for accumulators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1582Buck-boost converters

Abstract

Disclosed are a synchronous boost converter and a fuel cell system including the same, which solves a problem caused by reverse voltage and improves efficiency in a low current region. The synchronous boost converter may include an inductor having one end connected to a power input terminal, a boost switching element electrically opening / connecting the other end and the reference potential terminal of the inductor, and electrically opening / connecting the other end and the power output end of the inductor. The first current detector and the boost switching device and the open / connected state of the synchronous switching device which detect a current provided to the power output terminal are controlled at a preset duty ratio, and the first current detector is detected by the first current detector. And a switch controller for controlling the synchronous switching element to remain open when the magnitude of the current is smaller than a preset reference value. The synchronous boost converter may block reverse current flowing from the power output terminal to the power input terminal by reverse voltage during initial operation through state control of the boost switching device and the synchronous switching device.

Description

SYNCHRONOUS BOOST DC / DC CONVERTER AND FUEL CELL SYSTEM COMPRISING THE SAME

The present invention relates to a synchronous boost converter and a fuel cell system including the same. More particularly, the present invention relates to a synchronous boost converter and a fuel cell system including the same, which solve the problems caused by reverse voltage generation and improve efficiency in a low current region. .

Recently, research and development related to green energy that can replace fossil fuels due to depletion of fossil fuels and regulation of carbon dioxide emission have been actively conducted. Fuel cell technology, which is one of these green energy technologies, is increasingly being used in real life as well as research and development thereof.

Fuel cells have a wide range of applications from home to industrial use, but the response speed is slow due to the rapid change of load current, and the output voltage varies depending on the size of the load current. Is required. When the power converter is applied, the response speed to the load current can be improved due to the secondary battery, and the voltage can be stably supplied without being affected by the magnitude of the load current. The independent hybrid fuel cell system employing such a power converter includes a fuel cell, an input converter serving as a charger for boosting the output voltage of the fuel cell to a voltage required for charging the secondary battery, and an output voltage of the secondary battery. It may include an output converter for converting the voltage required by the load.

The input converter applied to the fuel cell system is to boost the output voltage of the fuel cell to the input voltage of the secondary battery so that the fuel cell can be charged to the secondary battery, and an efficient synchronous boost converter is applied. Can be. Synchronous boost converter is characterized by excellent efficiency, but the switching element used in the MOSFET is a device capable of energizing in both directions, the current flows into the fuel cell due to the reverse voltage state of the output terminal higher than the input terminal at the initial start-up, fuel Problems such as battery breakage may occur.

In addition, a plurality of switching elements are used for the synchronous boost converter, and dead time is set in order to solve a problem such as a circuit breakage caused by being connected at the same time in controlling the open / connected state of these switching elements. This dead time is a section in which the circuit does not operate, which reduces the efficiency of the circuit.

The present invention has been proposed to solve the above-described problems of the prior art, a synchronous boost converter that can solve the problem caused by the reverse voltage of the synchronous boost converter, and also solve the problem of lowering the circuit efficiency according to the dead time of the switching elements and It is an object of the present invention to provide a fuel cell system including the same.

According to an aspect of the present invention,

An inductor having one end connected to a power input terminal;

A boost switching element for electrically opening / connecting the other end of the inductor and the reference potential end;

A synchronous switching element electrically opening / connecting the other end of the inductor and a power output end;

A first current detector detecting a current provided to the power output terminal; And

The open / connected states of the boost switching element and the synchronous switching element are controlled at a preset duty ratio, and the synchronous switching element maintains an open state when the magnitude of the current detected by the first current detector is smaller than a preset reference value. Including a switch control unit to control to,

According to an aspect of the present invention, there is provided a synchronous boost converter which cuts off a reverse current flowing from a power output stage to a power input stage by a reverse voltage.

In one embodiment of the present invention, the boost switching element may be implemented as a MOSFET.

In one embodiment of the present invention, the synchronous switching element is a MOSFET having a parasitic diode formed in a forward direction between a source and a drain, wherein the source is connected to the other end of the inductor and the drain is at the power output terminal.

In one embodiment of the present disclosure, the switch control unit may control the synchronous switching element to maintain an open state when the duty ratio of the control signal provided to the boost switching element is smaller than a preset reference duty ratio.

In one embodiment of the present invention, further comprising a first voltage detector and a second voltage detector for detecting the voltage of the power input terminal and the voltage of the power output terminal, respectively, wherein the switch controller is detected by the second voltage detector When the voltage is smaller than a preset reference value compared to the voltage detected by the first voltage detector, the synchronous switching element may be controlled to maintain an open state.

In one embodiment of the present invention, further comprising a second current detector for detecting a current input to the power input terminal, wherein the switch controller is the boost switching element and the according to the magnitude of the current detected by the second current detector The dead time of the synchronous switching device may be changed, but as the magnitude of the current detected by the second current detector increases to a preset value, the magnitude of the dead time may be increased.

As another means for solving the above technical problem, the present invention,

Fuel cell;

A secondary battery that charges power provided from the fuel cell and provides power to a load;

An input converter boosting a voltage output from the fuel cell and providing the voltage to the secondary battery; And

An output converter for providing electric power provided from the secondary battery to a load, and converting the voltage of the secondary battery into a voltage required for the load;

The input converter,

An inductor having one end connected to the power output terminal of the fuel cell, a boost switching element for electrically opening / connecting the other end and the reference potential terminal of the inductor, and electrically opening / opening the other end of the inductor and the power output end of the input converter. A first current detector for detecting a current provided to a power output terminal of the input converter and an open / connected state of the boost switching device and the synchronous switching device with a preset duty ratio, And a switch controller for controlling the synchronous switching element to maintain an open state when the magnitude of the current detected by the current detector is smaller than a predetermined reference value. It is a synchronous boost converter which cuts off a flow It provides a fuel cell system in.

According to the present invention, by continuously opening the synchronous switch in the initial starting section of the synchronous boost converter, there is an effect that can solve problems such as circuit breakage due to reverse voltage. In particular, when the synchronous boost converter according to an embodiment of the present invention is applied to a fuel cell system, it is possible to solve the problem that the expensive fuel cell is broken by blocking the reverse current flowing into the fuel cell.

In addition, according to the present invention, by appropriately changing the dead time applied to the switching element of the synchronous boost converter according to the magnitude of the current, there is an effect that can improve the converter efficiency, especially in a low current state.

1 is a block diagram illustrating a fuel cell system to which a synchronous boost converter according to an embodiment of the present invention is applied.
2 is a circuit diagram of a synchronous boost converter according to an embodiment of the present invention.
3 to 5 are diagrams for explaining the operation of the synchronous boost converter according to an embodiment of the present invention.
6 is a view for explaining dead time control of a synchronous boost converter according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. In addition, in describing the present invention, the defined terms are defined in consideration of the functions of the present invention, and they may be changed depending on the intention or custom of the technician working in the field, so that the technical components of the present invention are limited It will not be understood as meaning.

1 is a block diagram illustrating a fuel cell system to which a synchronous boost converter according to an embodiment of the present invention is applied.

Referring to FIG. 1, a fuel cell system 10 to which a synchronous boost converter according to an embodiment is applied, charges a fuel cell 11, power output from the fuel cell 11, and outputs power to a load. A secondary battery 15, an input converter 12 for boosting the voltage output from the fuel cell 11 to output the voltage of the secondary battery 15, and an output of the secondary battery 15. An output converter 13 for converting the voltage of the secondary battery 15 into a voltage required for the load to provide power to the load 14 and a peripheral device (BOP) for providing power for operation of each component. It can be configured to include (16).

The input converter 12 is a DC / DC converter that boosts the voltage provided from the fuel cell 11 to a voltage having a level corresponding to the voltage of the secondary battery 15. In terms of functionality, the input converter 12 may convert the output voltage of the fuel cell 11 to the voltage of the secondary cell 15 so as to charge the secondary battery 15 with the power provided from the fuel cell 11. It can act as a charger to convert voltage levels. For example, the output voltage of the fuel cell 11 may be 28 to 50V, and the output voltage of the secondary battery 15 may be about 50 to 84V. As the input converter 12, a synchronous boost converter according to an embodiment of the present invention described in detail below may be employed.

The output converter 13 is a DC / DC converter that converts the output voltage of the input converter 12 and / or the secondary battery 15 into a voltage required by the load 14 and outputs the voltage. For example, the output voltage of the converter 12 and / or the secondary battery 15 may be 28 to 50V, and the voltage required by the load may be 28V. The output converter 13 may be implemented in a structure in which a full-bridge converter is connected in parallel by adopting an interleaving method to reduce the ripple of the output current.

The secondary battery 15 may charge power provided from the input converter 12 or provide power to the output converter 13 through discharge according to the amount of power required by the load. For example, when the power provided from the input converter 12 is less than the power required by the load 14, the secondary battery 15 provides power to the input of the output converter 13. That is, the output converter 13 may receive power from the input converter 12 and the secondary battery 15 to convert the voltage and provide the voltage to the load 14. As another example, when the power provided from the input return 12 is greater than the power required by the load 14, the secondary battery 15 may charge a portion of the power provided from the input converter 12. As described above, the secondary battery 15 may be charged and discharged according to the amount of power required by the load, thereby enabling the fuel cell system to be applied to a load requiring various powers.

2 is a circuit diagram of a synchronous boost converter according to an embodiment of the present invention.

2, a synchronous boost converter according to an exemplary embodiment of the present invention includes an inductor L1, a boost switching element S1, a synchronous switching element S2, a first current detector CDDT1, and a switch controller 121. It may be configured to include).

One end of the inductor L1 is connected to a power input terminal to which an input voltage Vin is applied. The inductor L1 repeats the operation of accumulating electrical energy and supplying the electrical power to the power output terminal according to the open / connected state of the boost switching device S1.

The boost switching element S1 controls the current provided from the inductor L1 to the power output terminal by changing an open / connected state according to a control signal provided from the switch controller 121. To this end, the boost switching element S1 may be controlled to electrically open / connect the other end of the inductor L1 and the reference potential terminal.

The control signal provided from the switch controller 121 may have a ratio, that is, a duty ratio of a high level for controlling the boost switching element S1 to be in a connected state and a low level interval for controlling the boost switching element S1 to be in an open state. It may be a set pulse width modulation signal.

In consideration of the fast reaction speed and the efficient aspect of the converter, the boost switching element S1 is preferably implemented as a MOSFET.

The synchronous switching element S2 is arranged to open / connect the inductor L1 and the power output terminal. Like the boost switching element S1 described above, the synchronous switching element S2 may be controlled in an open / connected state by a control signal provided by the switch controller 121.

In order to operate as a boost DC / DC converter, the control signal provided to the boost switching element S1 and the control signal provided to the synchronous switching element S2 have opposite phases of a high level and a low level. That is, when the boost switching element S1 is connected by the high level control signal, the synchronous switching element S2 is opened by the low level air signal, and the boost switching element S1 is low. In the open state by the level control signal, the synchronous switching element S2 is connected by the high level air signal.

As described above, for the fast response speed and efficiency of the circuit, the synchronous switching element S2 is also preferably implemented as a MOSFET. In particular, the synchronous switching element S2 is preferably implemented as a MOSFET having a parasitic diode formed in the forward direction between the source and the drain, and when the circuit is applied, the source of the synchronous switching element S2 is connected to the other end of the inductor L1. And the drain is connected to the power output stage.

The first current detector DCCT1 detects the magnitude of the current provided to the power output terminal. As the first current detector DCCT1, various types of current detection means known in the art may be applied. The magnitude of the current detected by the first current detector DCCT1 is provided to the switch controller 121.

The switch controller 121 provides a control signal for controlling the open / connected state of the above-described boost switching device S1 and the synchronous switching device S2. This control signal is a pulse width modulated signal whose high level and low level are determined at a preset ratio (duty ratio). When the boost switching element S1 and the synchronous switching element S2 are implemented as MOSFETs, the control signal provided from the switch controller 121 is input to the gate of the MOSFET to control the electrical connection state between the source and the drain of the MOSFET. do.

In the section in which the operation of the synchronous boost converter according to the embodiment of the present invention is started, that is, in the initial starting section, for soft start, the switch controller 121 adjusts the duty ratio of the control signal provided to the boost switching element S1. It gradually increases from zero to more than a predetermined reference duty ratio. In this initial starting section, the current provided to the power output stage gradually increases. The switch controller 121 receives the current of the power output terminal detected by the first current detector DCCT1 and controls the synchronous switching element S2 to be in an open state when the magnitude is smaller than a preset reference value. In addition, the switch controller 121 controls the switching element S2 to remain open even when the control signal to the boost switching element S1 gradually increased for soft start is smaller than the preset reference duty ratio.

The operation of the switch controller 121 may solve a problem that may occur in a reverse voltage state in which the voltage at the power output terminal is greater than the voltage at the power input terminal in the initial starting section of the boost converter. For example, in the fuel cell system as shown in FIG. 1, since the voltage of the secondary battery 15 is greater than the voltage of the fuel cell 11, the input converter 12 connected therebetween, that is, the power output terminal of the synchronous boost converter, is connected. The current flows into the fuel cell 11 connected to the power input terminal from the secondary battery 15 to solve the problem such as damage to the fuel cell.

When the magnitude of the current at the power output stage is larger than the preset reference value and the control signal provided to the boost switching element S1 is larger than the preset reference duty ratio (that is, when the steady state operation is performed), the switch controller 121 ) May provide a control signal having a phase opposite to that of the control signal provided to the boost switching element S1 to the synchronous switching element S2.

In addition to the components described above, the synchronous boost converter according to an embodiment of the present invention is a capacitor (Cout) for removing or reducing the ripple component of the current output to the power output stage, and the current input from the power input stage The second current detector DCCT2 may further include a first voltage detector DCPT1 and a second voltage detector DCPT2 for detecting voltages of the power input terminal and the power output terminal. The current detected by the second current detector DCCT2 may be provided to the switch controller 121 and used to determine the dead time. The first voltage detector DCPT1 and the second voltage detector DCPT2 may detect the voltage using a plurality of voltage divider R1 and R2 connected to the power input terminal and the power output terminal, respectively.

The voltage detected by the first voltage detector DCPT1 and the second voltage detector DCPT2 may be provided to the switch controller 121. The switch controller 121 compares the magnitudes of the voltages detected by the first voltage detector DCPT1 and the second voltage detector DCPT2, respectively, and when the voltage at the power output terminal is smaller than a preset reference value than the power at the power input terminal, the synchronous switching element. (S2) can be kept off continuously. The operation of the switch control unit 121 may also be another method for solving the problem caused by the reverse voltage state.

3 to 5 are diagrams for explaining the operation of the synchronous boost converter according to an embodiment of the present invention. 3 to 5, the operation of the synchronous boost converter according to one embodiment of the present invention will be described in more detail.

First, FIG. 3 shows a circuit in which the boost switching element S1 is connected and the synchronous switching element S2 is open by the control signal provided from the switch controller 121. When the period of the control signal provided from the switch controller 121 to the boost switching element S1 is T and the duty ratio is D, FIG. 3 illustrates a state of the D * T period.

In the state shown in FIG. 3, since the boost switching element S1 is in a connected state, the voltage applied to the boost switching element S1 is zero, and the current flowing through the inductor L1 is the boost switching element S1. Will flow into. Since the synchronous switching element S2 is in an open state, the voltage applied to the synchronous switching element S2 becomes the voltage vout of the power output terminal. Since the voltage of the inductor L1 is equal to the voltage Vin applied to the power input terminal and the inductor L1 takes a positive voltage, the current flowing through the inductor L1 is applied to the inductance of the inductor L1 and the power input terminal. The slope is determined by the voltage.

Next, FIG. 4 shows a circuit in which the boost switching element S1 is in an open state and the synchronous switching element S2 is also in an open state in the initial startup period. If the period of the control signal provided from the switch control unit 121 to the boost switching element S1 is T and the duty ratio is D, FIG. 4 shows the period (1-D) * T in the initial starting state. As described above, in the initial starting section, the operation of the synchronous boost converter according to an embodiment of the present invention is started, and the duty ratio of the control signal provided from the switch controller 121 to the boost switching element S1 is gradually increased gradually. It is a section. That is, the magnitude of the current detected by the first current detector DCCT1 is smaller than the preset reference value or the duty ratio of the control signal provided to the boost switching element S1 is smaller than the preset reference duty ratio.

In the state shown in FIG. 4, the voltage across the boost switching element S1 becomes the voltage Vout of the power output terminal, and the current flowing through the boost switching element S1 becomes zero. Since the synchronous switching element S2 is implemented as a MOSFET having a parasitic diode formed in the forward direction between the source and the drain, the parasitic diode even if the synchronous switching element S2 is turned off by the control signal provided from the switch controller 121. As a result, current flows from the inductor L1 to the power output terminal. At this time, the voltage applied to the inductor L1 has the same value as the voltage Vout of the power output terminal is subtracted from the voltage Vin of the power input terminal. Since a negative voltage is applied to the inductor L1, a current that decreases to a slope determined by subtracting the voltage Vout of the power output terminal from the inductance of the inductor L1 and the voltage Vin of the power input terminal is an inductor L1. ) Flows.

Next, FIG. 5 shows a circuit in which the boost switching element S1 is in an open state and the synchronous switching element S2 is in a connected state after the initial startup period has elapsed. That is, FIG. 5 illustrates a boost switching element when a sufficient current equal to or greater than a preset reference value is output to the power output terminal after the initial startup period passes, and the duty ratio of the control signal provided to the boost switching element S1 is equal to or greater than the preset reference duty ratio. A circuit is shown in which S1 is in an open state and the synchronous switching element S2 is in a connected state.

The circuit shown in FIG. 5 operates similarly to FIG. That is, the voltage across the boost switching element S1 becomes the voltage Vout of the power output terminal, and the current flowing through the boost switching element S1 becomes zero. In addition, the voltage applied to the inductor L1 has the same value as the subtraction of the voltage Vout of the power output terminal from the voltage Vin of the power input terminal. Since a negative voltage is applied to the inductor L1, the inductor L1 is applied. A current that decreases with a slope determined by a value obtained by subtracting the inductance and the voltage Vin of the power input terminal from the voltage Vin of the power output terminal flows through the inductor L1.

In the synchronous boost converter according to the exemplary embodiment of the present invention, the states of FIGS. 3 and 4 are alternately repeated according to the duty ratio of the control signal provided to the boost switching element S1 in the initial starting state, and the initial starting state. When the elapsed time becomes a normal operation state, the states of FIGS. 3 and 5 are alternately repeated. In the initial starting state, the synchronous switching element S2 is kept in the interrupted state, and thus the problem caused by the reverse voltage can be solved even when the MOSFET is brought into the bidirectional conduction state by the gate voltage.

On the other hand, in the synchronous converter, since two switching elements are applied, a dead time of a predetermined time is required before opening the switching element in order to prevent a circuit breakdown caused by two switching elements being connected at the same time. Set it. The present invention can appropriately control this dead time to improve the efficiency of the synchronous converter.

6 is a view for explaining dead time control of a synchronous boost converter according to an embodiment of the present invention.

As indicated by reference numeral '51' in FIG. 6, in the synchronous boost converter according to the exemplary embodiment of the present invention, the switch controller 121 is configured to determine the magnitude of the current at the power input stage detected by the second current detector DCCT2. Determine the size of dead time accordingly. The switch controller 121 sets a short dead time when the magnitude of the current input from the power input terminal is small and protects the circuit by increasing the magnitude of the dead time as the magnitude of the current increases. That is, the switch controller 121 may increase the size of the dead time as the magnitude of the current detected by the second current detector DCCT2_ increases to a preset value.

On the other hand, conventionally, as indicated by the reference numeral '52', since the dead time is used as one value determined regardless of the magnitude of the current, the efficiency of the converter in low current operation that does not require a large dead time is required. Degraded.

As described above, one embodiment of the present invention can improve the efficiency of the circuit during low current operation by changing and setting the dead time corresponding to the magnitude of the current input to the synchronous converter.

11: fuel cell 12: input converter (synchronous boost converter)
13: output transducer 14: load
15: secondary battery 16: peripherals
L1: Inductor S1: Boost Switching Element
S2: synchronous switching element DCCT1: first current detector
131: switch control unit

Claims (12)

  1. An inductor having one end connected to the power input terminal;
    A boost switching element for electrically opening / connecting the other end of the inductor and the reference potential end;
    A synchronous switching element electrically opening / connecting the other end of the inductor and a power output end;
    A first current detector detecting a current provided to the power output terminal; And
    The open / connected states of the boost switching element and the synchronous switching element are controlled at a preset duty ratio, and the synchronous switching element maintains an open state when the magnitude of the current detected by the first current detector is smaller than a preset reference value. And a switch controller to control the synchronous switching element to remain open when the duty ratio of the control signal provided to the boost switching element is smaller than a preset reference duty ratio.
    A synchronous boost converter for blocking the reverse current flowing from the power output stage to the power input stage by the reverse voltage during the initial operation.
  2. The method of claim 1,
    The boost switching element is a synchronous boost converter, characterized in that the MOSFET.
  3. The method of claim 1,
    The synchronous switching device is a MOSFET having a parasitic diode formed in a forward direction between a source and a drain, wherein the source is connected to the other end of the inductor and the drain is connected to the power output terminal.
  4. delete
  5. The method of claim 1,
    And a first voltage detector and a second voltage detector configured to detect a voltage at the power input terminal and a voltage at the power output terminal, respectively.
    The switch controller may be configured to control the synchronous switching element to maintain an open state when the voltage detected by the second voltage detector is smaller than a preset reference value compared to the voltage detected by the first voltage detector. Boost Converter.

  6. The method of claim 1,
    Further comprising a second current detector for detecting a current input to the power input terminal,
    The switch controller changes the dead time of the boost switching element and the synchronous switching element according to the magnitude of the current detected by the second current detector, but increases the magnitude of the current detected by the second current detector to a preset value. The synchronous boost converter, characterized in that for increasing the size of the dead time.

  7. Fuel cell;
    A secondary battery that charges power provided from the fuel cell and provides power to a load;
    An input converter boosting a voltage output from the fuel cell and providing the voltage to the secondary battery; And
    An output converter for providing electric power provided from the secondary battery to a load, and converting the voltage of the secondary battery into a voltage required for the load;
    The input converter,
    An inductor having one end connected to the power output terminal of the fuel cell, a boost switching element electrically opening / connecting the other end and the reference potential terminal of the inductor, and electrically opening / connecting the other end of the inductor and the power output end of the input converter. A first current detector for detecting a current provided to a power output terminal of the input converter and an open / connected state of the boost switching device and the synchronous switching device with a preset duty ratio, wherein the first current When the magnitude of the current detected by the detector is smaller than a preset reference value, the synchronous switching element is controlled to maintain an open state, and when the duty ratio of the control signal provided to the boost switching element is smaller than a preset reference duty ratio. To control the synchronous switching element to remain open. Including the position control unit, the fuel cell system, characterized in that a synchronous boost converter to block the reverse current flowing into the power input terminal from the power output stage during the initial operation by the reverse voltage.
  8. The method of claim 7, wherein
    The boost switching device is a fuel cell system, characterized in that the MOSFET.

  9. The method of claim 7, wherein
    The synchronous switching element is a MOSFET having a parasitic diode formed in a forward direction between a source and a drain, wherein the source is connected to the other end of the inductor and the drain is connected to the power output terminal of the input converter.

  10. delete
  11. The method of claim 7, wherein
    And a first voltage detector and a second voltage detector for detecting a voltage at the power output terminal of the fuel cell and a voltage at the power output terminal of the input converter, respectively.
    The switch controller may control the synchronous switching element to maintain an open state when the voltage detected by the second voltage detector is smaller than a preset reference value compared to the voltage detected by the first voltage detector. Battery system.

  12. The method of claim 7, wherein
    Further comprising a second current detector for detecting a current input from the power output terminal of the fuel cell,
    The switch controller changes the dead time of the boost switching element and the synchronous switching element according to the magnitude of the current detected by the second current detector, but increases the magnitude of the current detected by the second current detector to a preset value. The fuel cell system, characterized in that for increasing the size of the dead time.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9649941B2 (en) 2013-07-11 2017-05-16 Ford Global Technologies, Llc Boost converter deadtime compensation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0576167A (en) * 1991-09-13 1993-03-26 Nippon Motoroola Kk Dc/dc voltage converter
JP2007328955A (en) 2006-06-06 2007-12-20 Matsushita Electric Ind Co Ltd Power source device
JP2010022077A (en) 2008-07-08 2010-01-28 Panasonic Corp Power supply device
JP2011050221A (en) 2009-08-28 2011-03-10 Seiko Instruments Inc Synchronous rectification type voltage converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0576167A (en) * 1991-09-13 1993-03-26 Nippon Motoroola Kk Dc/dc voltage converter
JP2007328955A (en) 2006-06-06 2007-12-20 Matsushita Electric Ind Co Ltd Power source device
JP2010022077A (en) 2008-07-08 2010-01-28 Panasonic Corp Power supply device
JP2011050221A (en) 2009-08-28 2011-03-10 Seiko Instruments Inc Synchronous rectification type voltage converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9649941B2 (en) 2013-07-11 2017-05-16 Ford Global Technologies, Llc Boost converter deadtime compensation

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