KR20170067952A - Lossless energy recovery circuit - Google Patents

Lossless energy recovery circuit Download PDF

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Publication number
KR20170067952A
KR20170067952A KR1020150174404A KR20150174404A KR20170067952A KR 20170067952 A KR20170067952 A KR 20170067952A KR 1020150174404 A KR1020150174404 A KR 1020150174404A KR 20150174404 A KR20150174404 A KR 20150174404A KR 20170067952 A KR20170067952 A KR 20170067952A
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KR
South Korea
Prior art keywords
battery
transformer
switch
energy
current
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KR1020150174404A
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Korean (ko)
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KR101816363B1 (en
Inventor
김명복
곽봉우
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한국생산기술연구원
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Priority to KR1020150174404A priority Critical patent/KR101816363B1/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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A circuit for a pulsed battery charger including a lossless energy regenerative circuit, which is an embodiment of the present invention, includes a receiving end connected to a battery charger, a charging mode for receiving a current from the battery charger and delivering the current to the battery, And an energy regenerator for regenerating the energy stored in the at least one capacitor in the charge mode in the charge mode and delivering the stored energy to the battery, And a transmitter for providing the battery with a current supplied from the battery charger.

Description

[0001] LOSSLESS ENERGY RECOVERY CIRCUIT [0002]

The invention belongs to the field of lossless energy recovery circuits, and in particular falls within the field of lossless energy recovery circuits for pulsed battery chargers.

Recently, a battery charging system is rapidly developing. However, the existing battery charging system has various disadvantages when charging by applying only a constant current. The existing battery charging system applies only the constant current with no time variation. When a constant current is applied in this manner, an ion layer is formed in the battery upon charging. When such an ion layer is formed, heat is generated in the battery or loss of energy occurs, and the current to be charged can not be increased. Therefore, in order to overcome these disadvantages, a pulse type charger is recently developed.

Conventionally, a voltage charged in the at least one capacitor in the form of a pulse in a discharge mode is discharged through a resistor, resulting in power loss, resulting in a reduction in overall efficiency and generation of heat. That is, a resistor is generally coupled to a conventional pulse-type charger, and energy is discharged through the resistor in a discharge mode, thereby causing power loss. Therefore, the conventional pulse type charger has a problem that the overall efficiency is reduced due to the resistance and heat is generated.

Accordingly, the present invention aims at solving the problem of replacing the resistor with a lossless energy regenerative circuit, thereby reducing the charging efficiency through energy discharge.

A circuit for a pulsed battery charger including a lossless energy regenerative circuit, which is an embodiment of the present invention, is intended to provide a circuit for a pulsed battery charger in which no power loss occurs, the overall charging efficiency is improved, and a heat generation problem does not occur.

A circuit for a pulsed battery charger including a lossless energy regenerative circuit, which is an embodiment of the present invention, includes a receiving end connected to a battery charger, a charging mode for receiving a current from the battery charger and delivering the current to the battery, And an energy regenerator for regenerating the energy stored in the at least one capacitor in the charge mode in the charge mode and delivering the stored energy to the battery, And a transmitter for providing the battery with a current supplied from the battery charger.

In the pulse-type battery charger circuit including the lossless energy recovery circuit, which is one embodiment of the present invention, the at least one switch can perform PWM (Pulse Width Modulation) operation.

Further, in the circuit for a pulsed battery charger including a lossless energy recovery circuit, which is one embodiment of the present invention, the at least one switch may be a pair of switches.

Further, in the circuit for a pulsed battery charger including a lossless energy recovery circuit, which is an embodiment of the present invention, the pair of switches may be turned on or off at the same time.

According to another aspect of the present invention, there is provided a circuit for a pulsed battery charger including a lossless energy recovery circuit, wherein the energy recovery unit includes a transformer.

In another aspect of the present invention, there is provided a circuit for a pulsed battery charger including a lossless energy recovery circuit, wherein the transformer includes a primary side and a secondary side, And the second side is connected to the transmitting end.

In another aspect of the present invention, there is provided a circuit for a pulse-type battery charger including a lossless energy regenerative circuit, wherein the energy regenerator is configured such that the first side of the at least one switch and the transformer forms a discharge loop of the capacitor .

In another aspect of the present invention, there is provided a circuit for a pulsed battery charger including a lossless energy regenerative circuit, wherein the energy regenerator is connected to one end and the other end of the primary side of the transformer to balance a magnetizing current of the transformer, And a pair of free wheeling diodes.

In another aspect of the present invention, there is provided a circuit for a pulsed battery charger including a lossless energy regenerative circuit, wherein the energy regenerator disconnects the secondary side of the transformer in the discharge mode, And a diode connected to one end of the secondary side of the transformer for allowing the primary side energy to flow into the battery.

According to the pulse-type battery charger circuit including the lossless energy regenerative circuit, which is one embodiment of the present invention, energy stored in the discharge mode in the at least one capacitor can be provided to the battery through the transmitter.

In addition, according to the pulse-type battery charger circuit including the lossless energy regenerative circuit, which is an embodiment of the present invention, the energy stored in the capacitor in the discharge mode is supplied from the charge mode to the battery, And there is no heat generation problem.

1 is a circuit diagram showing a circuit for a pulsed battery charger including a lossless energy recovery circuit, which is an embodiment of the present invention, is connected to a battery charger and a battery.
FIG. 2 is a circuit diagram illustrating a circuit for a pulse battery charger including a lossless energy recovery circuit according to an embodiment of the present invention. Referring to FIG.
3 is a timing chart showing the turn-on and turn-off operations of the switches according to the charge mode and the discharge mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to an embodiment of the present invention.
FIG. 4 is a circuit diagram illustrating a circuit for a pulse battery charger including a lossless energy recovery circuit according to another embodiment of the present invention.
FIGS. 5 and 6 are timing charts illustrating the turn-on and turn-off operations of the switches according to the charging mode and the discharging mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to another embodiment of the present invention.
7 is a circuit diagram showing a current flow in a charging mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to another embodiment of the present invention.
8 is a circuit diagram showing the flow of current when a pair of energy recovery circuit switches are turned on in a charge mode in a pulse battery charger circuit including a lossless energy recovery circuit according to another embodiment of the present invention.
9 is a circuit diagram showing a flow of current when a pair of energy recovery circuit switches are turned off in a charge mode in a pulse battery charger circuit including a lossless energy recovery circuit which is another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In describing the present invention, the scope of the present invention is not limited to the following embodiments.

1 is a circuit diagram showing a circuit for a pulsed battery charger including a lossless energy recovery circuit, which is an embodiment of the present invention, is connected to a battery charger and a battery. Referring to FIG. 1, in the circuit for a pulsed battery charger according to an embodiment of the present invention, the current pulse generation circuit 100 may include a lossless energy recovery circuit. The current pulse generating circuit 100 includes a receiving terminal 110 connected to the battery charger 140 and a charging mode receiving current from the battery charger 140 and delivering the current to the battery 150, And a transmitting terminal 120 connected to the battery 150 and providing a current supplied from the battery charger 140 to the battery 150 can do.

At this time, the power source 130 is electrically connected to the battery 140 to supply power. For example, the power source 130 may supply AC power to the battery 140, and the battery charger 140 may receive AC power from the power source 130. At this time, the battery charger 140 can convert the supplied AC power into DC power. The battery charger 140 may be electrically connected to the battery 150 to charge the battery 150 with electric power.

The receiving terminal 110 of the current pulse generating circuit 100 may be connected to the transmitting terminal of the battery charger 140. At this time, the receiving end 110 of the current pulse generating circuit 100 may be connected to the transmitting end of the battery charger 140 in parallel. And may receive power from the battery charger 140 through the receiving terminal 110. [

The current pulse generation circuit control unit may control a charge mode in which a current is supplied from the battery charger 140 to the battery 150 and a discharge mode in which the battery 150 is discharged. At this time, the current pulse generator circuit control unit may generate a current pulse that allows a positive current to flow in the charge mode and a negative current to flow in the discharge mode. That is, the current pulse generation circuit control unit charges the battery 150 by flowing a positive current to the battery 150 in the charge mode using the power supplied from the battery charger 140, A negative current may flow to discharge the battery 150 to allow current to flow through the battery 150.

At this time, the current pulse generating circuit control unit may cause the battery 150 to repeatedly apply the charging current and the discharging current to flow the pulse current. As described above, when the current pulse generating circuit control unit charges the battery 150 with a pulse current flowing through the battery 150, the ion layer formed at the time of charging is diffused and decomposed into electrolytes to increase the internal resistance at the time of charging. And consequently, the current to be charged is increased to enable quick charging.

FIG. 2 is a circuit diagram illustrating a circuit for a pulse battery charger including a lossless energy recovery circuit according to an embodiment of the present invention. Referring to FIG. Referring to FIG. 2, the lossless energy recovery circuit 200 may be included in the circuit 100 for a pulsed battery charger. The circuit 100 for the pulsed battery charger may include a bidirectional switch 230, at least one capacitor 242, 244, and a discharge switch 250.

One end of the bidirectional switch 230 may be connected to the anode 210 of the receiving end and the other end may be connected to the anode 220 of the transmitting end. The bidirectional switch 230 may be turned on in the charging mode and turned off in the discharging mode. Accordingly, in the charging mode, the bidirectional switch 230 is turned on to transfer the current supplied from the battery charger to the battery to charge the battery. In the discharging mode, the bidirectional switch 230 is turned off, It is possible to prevent the voltage of the battery 150 from flowing into the battery charger 140.

One end of the at least one capacitor 242 and 244 may be connected to the bi-directional switch 230 and the other end may be connected to the discharge switch 250. At this time, the at least one capacitor 242, 244 may store energy in the discharge mode. That is, in the discharge mode, the bidirectional switch 230 is turned off, and the discharge current can flow from the transmitting terminal 220 and stored in the at least one capacitor. At this time, the at least one capacitor may be a plurality of capacitors, and may be connected to the transmitting and receiving ends in parallel.

One end 310 of the discharging switch 250 may be connected to the capacitors 242 and 244 and the other end 320 may be connected to the cathode 212 of the receiving terminal. At this time, the discharge switch 250 may perform a turn-on and turn-off operation. For example, the discharge switch 250 is turned off in the charge mode and turned on in the discharge mode. Here, the discharge switch 250 may cause a pulse-shaped discharge current to flow to the battery 150 in the discharge mode.

And wherein the lossless energy recovery circuit (200) includes at least one switch (260, 262) to regenerate energy stored in the at least one capacitor (242, 244) in the charge mode in the charge mode, And an energy regenerating unit that transfers energy to the battery 150. [

One end 304 of the at least one switch may be connected to one end 302 of the at least one capacitor and the other end 314 may be connected to the other end 312 of the at least one capacitor. At this time, the at least one switch may perform PWM (Pulse Width Modulation) operation. The PWM operation may mean a switching operation that periodically repeats 0 and 1, for example. And the at least one switch may be a pair of switches. For example, as shown in FIG. 2, the at least one switch is a pair of switches 260 and 262, and one end 304 of the first switch 260 is connected to one end 302 of the at least one capacitor One end of the second switch 262 is connected to the other end 312 of the at least one capacitor and the other end is connected to one end 316 of the transformer 270 .

And the pair of switches 260 and 262 can be turned on or off at the same time. That is, when the pair of switches 260 and 262 are simultaneously turned on, the pair of switches 260 and 262, the transformer 270 and the at least one capacitor 242 and 244 are connected to one loop So that a current can flow. That is, the at least one switch and the primary side of the transformer may form a discharge loop of the capacitor. Conversely, when the pair of switches 260 and 262 are simultaneously turned off, current may not flow in the discharge loop.

The energy regenerating unit may include a transformer 270. At this time, the transformer 270 may include a primary side and a secondary side. And the primary side may be connected to the at least one switch and the secondary side may be connected to the transmitting end. For example, as shown in FIG. 2, one end 318 of the primary side of the transformer 270 is connected to one end of the first switch 260, and one end 316 of the secondary side And may be connected to one end of the second switch 262. One end of the secondary side of the transformer 270 may be connected to the anode 220 of the transmitting terminal and the other end 322 of the secondary side may be connected to the cathode 222 of the transmitting terminal.

The energy regenerating unit may include a pair of freewheeling diodes connected to one end and the other end of the primary side of the transformer to balance the magnetizing current of the transformer. For example, as shown in FIG. 2, one end 316 of the primary side of the transformer is connected to one end 316 of the first diode 280 of the pair of diodes, The other end 318 of the second diode 282 may be connected to one end 318 of the second diode 282 among the pair of diodes. The other end 306 of the first diode 280 is connected to the anode 220 of the transmitting terminal and the other end 314 of the second diode 282 is connected to the one end 314 of the second switch 262 Can be connected. At this time, the pair of diodes may balance the magnetizing current of the transformer 270. That is, the pair of diodes may be connected to the anode 220 of the transmitting terminal and the second switch 262, respectively, so as to balance and flow the magnetizing current flowing on the primary side of the transformer 270.

The energy regenerating unit may include a diode connected to one end of the secondary side of the transformer to disconnect the secondary side of the transformer in the discharging mode and to discharge the primary side energy of the transformer in the charging mode, . ≪ / RTI > For example, as shown in FIG. 2, the diode may be a third diode 290, one end of the third diode 290 is connected to the transformer 270, and the other end of the third diode is connected to the And may be connected to the anode 220. At this time, the third diode 290 can regenerate the energy of the at least one capacitor 242, 244 in the charge mode and supply the energy to the secondary side of the transformer 270. That is, the third diode 290 receives the energy stored in the at least one capacitor 242, 244 through the transformer, connects the current flowing in the secondary side of the transformer to the transmitting terminal, can do.

Therefore, according to the pulse-type battery charger circuit including the lossless energy regenerative circuit, which is one embodiment of the present invention, the energy stored in the discharge mode in the at least one capacitor can be provided to the battery through the transmitter . Conventionally, a voltage charged in the at least one capacitor in the form of a pulse in a discharge mode is discharged through a resistor, resulting in power loss, resulting in a reduction in overall efficiency and generation of heat. However, according to the pulse-type battery charger circuit including the lossless energy regenerative circuit, which is an embodiment of the present invention, the energy stored in the capacitor in the discharging mode is supplied from the charging mode to the battery, There is an effect that no heat generation problem occurs.

3, the operation of a circuit for a pulsed battery charger including a lossless energy recovery circuit, which is an embodiment of the present invention, will be described.

3 is a timing chart showing the turn-on and turn-off operations of the switches according to the charge mode and the discharge mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to an embodiment of the present invention.

3, in accordance with charging modes 350 and 352 and discharge mode 360, a plurality of switches included in a circuit for a pulsed battery charger including a lossless energy recovery circuit are turned on or off The process is represented by time

In the charging mode 350, the bi-directional switch 230 is turned on and the discharging switch 250 is turned off so that the at least one switch 260 (Q3) connected to the transformer 270 ) And 262 (Q4) perform the PWM switching operation.

The bi-directional switch 230 is turned on and current flows in the charging mode 350 and 352 and the at least one switch 260 and 262 connected to the transformer 270 performs a PWM switching operation, The energy stored in the capacitors 242 and 244 is transferred to the secondary side.

Since the bi-directional switch 230 is turned on and the current supplied from the battery charger 140 flows from the receiving terminal 210 but the discharging switch 250 and Q2 are turned off, , And Q2. At this time, the current provided from the receiving terminal 210 flows to the transmitting terminal 220 connected to the battery 150, so that the battery 150 can be charged.

The at least one switch 260 (Q3), 262 (Q4) connected to the transformer 270 performs a PWM switching operation, so that the at least one switch 260 (Q3) 262 (Q4) The pair of switches 260 and 262, the transformer 270 and the at least one capacitor 242 and 244 form one loop (discharge loop) to allow current to flow therethrough . That is, the at least one switch and the primary side of the transformer may form a discharge loop of the capacitor. Conversely, if the at least one switch 260 (Q3), 262 (Q4) is turned on at the same time as a pair of switches, no current may flow through the discharge loop.

The discharge mode will be described with reference to FIG. In the discharge mode, the bi-directional switch 230 (Q1) is turned off and no current flows, and the at least one switch 260 (Q3), 262 (Q4) is also turned off so that no current flows. However, the discharge switches 250 and Q2 perform the turn-on and turn-off operations 540. [ At this time, the control unit may control the discharge mode to have a rest period of the same time between the plurality of discharge modes. For example, after the first charging mode 350, the first idle period 372, the first discharge mode 362, the second idle period 374, the second discharge mode 364, And the third idle period 376, and controls the second charging mode 352 to proceed again. At this time, the discharge switch 250 may cause a pulse-shaped discharge current to flow to the battery 450 in the discharge mode.

FIG. 4 is a circuit diagram illustrating a circuit for a pulse battery charger including a lossless energy recovery circuit according to another embodiment of the present invention. Referring to FIG. 4, the lossless energy recovery circuit 200 may be included in the circuit 100 for a pulsed battery charger. The circuit 100 for the pulsed battery charger may include a bidirectional switch 230, at least one capacitor, and a discharge switch 250.

One end of the bidirectional switch 230 may be connected to the anode 210 of the receiving end and the other end may be connected to the anode 220 of the transmitting end. The bidirectional switch 230 may be turned on in the charging mode and turned off in the discharging mode. Accordingly, in the charging mode, the bidirectional switch 230 is turned on to transfer the current supplied from the battery charger to the battery to charge the battery. In the discharging mode, the bidirectional switch 230 is turned off, It is possible to prevent the voltage of the battery 150 from flowing into the battery charger 140

One end of the at least one capacitor 240 may be connected to an inductor 246 connected to the diode 248 and the other end 422 may be connected to the cathode 212. That is, one end 412 of the at least one capacitor 240 is connected to one end of the diode 248, the other end 410 of the diode 248 is connected to one end 410 of the inductor, The other end 400 of the inductor may be connected to one end of the bidirectional switch 230. At this time, the at least one capacitor 240 may store energy in the discharge mode. That is, in the discharging mode, the bidirectional switch 230 is turned off, discharging current flows from the transmitting terminal 220, and energy is stored while flowing in the inductor 240 and the at least one capacitor 240 . At this time, the at least one capacitor may be connected in parallel to the transmitting terminal and the receiving terminal.

One end 410 of the discharge switch 250 may be connected to the inductor 246 and the other end 420 may be connected to the cathode 212 of the receiving end. At this time, the discharge switch 250 may perform the PWM operation. In this way, a pulse-shaped discharge current can flow through the battery 450 in the discharge mode by the PWM operation.

And wherein the lossless energy recovery circuit (200) includes at least one switch (260, 262) to regenerate the energy stored in the at least one capacitor (240) in the charge mode in the charge mode, And an energy regenerating unit for transmitting the energy to the battery 150. [

One end 412 of the at least one switch 260 and 262 may be connected to one end 412 of the at least one capacitor and the other end 424 may be connected to the other end 422 of the at least one capacitor . At this time, the at least one switch may perform a PWM operation. The PWM operation may mean a switching operation that periodically repeats 0 and 1, for example. And the at least one switch may be a pair of switches. For example, as shown in FIG. 4, the at least one switch is a pair of switches 260 and 262, one end 412 of the first switch 260 being connected to one end 412 of the at least one capacitor And one end 424 of the second switch 262 is connected to the other end 422 of the at least one capacitor and the other end is connected to the end of the transformer 270 And may be connected to one end 416.

And the pair of switches 260 and 262 can be turned on or off at the same time. That is, when the pair of switches 260 and 262 are simultaneously turned on, the pair of switches 260 and 262, the transformer 270, and the at least one capacitor 240 form a loop (discharge loop) So that a current can flow. That is, the at least one switch and the primary side of the transformer may form a discharge loop of the capacitor. Conversely, when the pair of switches 260 and 262 are simultaneously turned off, current may not flow in the discharge loop.

The energy regenerating unit may include a transformer 270. At this time, the transformer 270 may include a primary side and a secondary side. And the primary side may be connected to the at least one switch and the secondary side may be connected to the transmitting end. 4, one end 414 of the primary side of the transformer 270 is connected to one end of the first switch 260, and one end 416 of the secondary side of the transformer 270 is connected to one end of the first switch 260, And may be connected to one end of the second switch 262. One end of the secondary side of the transformer 270 is connected to the anode 220 of the transmitting terminal and the other end 428 of the secondary side is connected to the cathode 222 of the transmitting terminal.

The energy regenerating unit may include a pair of freewheeling diodes connected to one end and the other end of the primary side of the transformer to balance the magnetizing current of the transformer. 4, one end 414 of the primary side of the transformer is connected to one end 414 of the first diode 284 of the pair of diodes, and the first side 414 of the transformer The other end 416 of the second diode 286 may be connected to one end 416 of the second diode 286 among the pair of diodes. The other end 426 of the first diode 284 is connected to the other end 424 of the second switch 262 and the other end 406 of the second diode 286 is connected to the anode 220 of the transmitter. Lt; / RTI > At this time, the pair of diodes may balance the magnetizing current of the transformer 270. That is, the pair of diodes may be connected to the anode 220 of the transmitting terminal and the second switch 262, respectively, so as to balance and flow the magnetizing current flowing on the primary side of the transformer 270.

The energy regenerating unit may include a diode connected to one end of the secondary side of the transformer to disconnect the secondary side of the transformer in the discharging mode and to discharge the primary side energy of the transformer in the charging mode, . ≪ / RTI > For example, as shown in FIG. 4, the diode may be a third diode 290, one end of the third diode 290 is connected to the transformer 270, and the other end of the third diode is connected to the And may be connected to the anode 220. At this time, the third diode 290 may supply the energy stored in the discharge mode by the at least one capacitor 240 to the secondary side of the transformer 270. That is, the third diode 290 receives the energy stored in the at least one capacitor 240 through the transformer, and connects the current flowing in the secondary side of the transformer to the transmitter so as to flow have.

Therefore, according to the pulse-type battery charger circuit including the lossless energy regenerative circuit according to another embodiment of the present invention, the energy stored in the discharge mode in the at least one capacitor can be provided to the battery through the transmitter . That is, according to the pulse-type battery charger circuit including the lossless energy recovery circuit, which is another embodiment of the present invention, the energy stored in the capacitor in the discharge mode is supplied from the charge mode to the battery, There is an effect that no heat generation problem occurs.

5 to 9, a circuit for a pulsed battery charger including a lossless energy recovery circuit, which is another embodiment of the present invention, will be described in more detail.

FIGS. 5 and 6 are timing charts showing the turn-on and turn-off operations of the switches according to the charge mode and the discharge mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to another embodiment of the present invention. 7 is a circuit diagram showing a current flow in a charging mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to another embodiment of the present invention. 8 is a circuit diagram showing a flow of current when a pair of switches is turned on in a charge mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to another embodiment of the present invention. 9 is a circuit diagram showing a flow of current when a pair of switches is turned off in a charging mode in a circuit for a pulsed battery charger including a lossless energy recovery circuit according to another embodiment of the present invention. Here, the circuit elements of the circuit diagrams shown in FIGS. 7 to 9 are the same as those of FIG. 4 described above, and a detailed description thereof will be omitted.

5, according to the charging mode 500, 520 and the discharging mode 510, a plurality of switches included in a circuit for a pulsed battery charger including a lossless energy recovery circuit are turned on or off The process is illustrated by time

In the charging mode 500 or 520 the bi-directional switch 230 is turned on and the discharging switch 250 is turned off and the at least one switch 260 (Q3) connected to the transformer 270 ) And 262 (Q4) perform the PWM switching operation.

FIG. 6 shows a process in which the at least one switch 260 and 262 performs a PWM switching operation with respect to time. 6, the bi-directional switch 230 is turned on in the charging mode 500 and 520 and the at least one switch 260 and 262 connected to the transformer 270 performs a PWM switching operation And transfers the energy stored in the one capacitor 240 to the secondary side.

The flow of current in the charging modes 500 and 520 will be described with reference to FIG. The bidirectional switch 230 is turned on and the current supplied from the battery charger 140 flows from the receiving terminal 210 while the discharging switches 250 and Q2 are turned on in the charging mode 500 and 520, The current does not flow through the inductor 246 and the discharge switches 250 and Q2. At this time, the current provided from the receiving terminal 210 flows to the transmitting terminal 220 connected to the battery 150, so that the battery 150 can be charged.

The at least one switch 260 (Q3), 262 (Q4) connected to the transformer 270 performs a PWM switching operation, so that the at least one switch 260 (Q3) 262 (Q4) The pair of switches 260 and 262, the transformer 270 and the at least one capacitor 240 form a loop (discharge loop) to allow current to flow therethrough . That is, the at least one switch and the primary side of the transformer may form a discharge loop of the capacitor. 8 shows a state in which the discharge loop is formed in the charge mode. Referring to FIG. 8, the at least one switch 260 and 262 and the primary side of the transformer 270 form a discharge loop of the capacitor, so that current flows. And the current formed in the discharge loop may flow through the secondary side of the transformer through the diodes 290 and D3 to the transmission. Therefore, according to another embodiment of the present invention, the energy stored in the at least one capacitor 240 can be supplied to the battery connected to the transmitter through the transformer by the current flowing in the discharge loop.

Conversely, if the at least one switch 260 (Q3), 262 (Q4) is turned on at the same time as a pair of switches, no current may flow through the discharge loop. FIG. 9 shows the flow of currents turned off at the same time when the at least one switch 260 (Q3), 262 (Q4) in the charging mode makes a pair of switches. 9, the at least one switch 260 (Q3), 262 (Q4) is turned off so that no current flows in the discharge loop described in FIG. 8, and a pair of diodes Current flows through the first diode 284 and the second diode 286 and flows to the transmitting terminal.

Therefore, according to the circuit for a pulsed battery charger including a lossless energy recovery circuit, which is another embodiment of the present invention, the at least one switch 260 (Q3), 262 (Q4) A current flows through the discharge loop and can be supplied to the battery connected to the transmitter through the transformer. In contrast, when at least one of the switches 260 (Q3) and 262 (Q4) is turned on and off at the same time, no current flows through the discharge loop, but a current flows through a pair of diodes connected to the transmitter, Current flows to the transmitting end.

The discharge mode will be described with reference to FIG. In the discharge mode, the bi-directional switch 230 (Q1) is turned off and no current flows, and the at least one switch 260 (Q3), 262 (Q4) is also turned off so that no current flows. However, the discharge switches 250 and Q2 perform the PWM switching operation 540. [ At this time, the control unit may control the discharge mode to have a rest period of the same time between the plurality of discharge modes. 5, the first idle period 530, the first discharge mode 512, the second idle period 532, the second discharge mode 514, , And the third pause period (534), and control the second charging mode (520) to proceed again. At this time, the PWM switch operation may be performed to allow a pulse-shaped discharge current to flow to the battery 450 in the discharge mode. That is, in the discharge mode, the bidirectional switch 230 is turned off, a discharge current flows from the transmission terminal 220, and energy is stored in the at least one capacitor 240 according to the PWM switch operation have. The stored energy may be provided to the battery connected to the transmitter through the transformer in a charging mode, as described in Figures 7-9.

Therefore, according to the pulse-type battery charger circuit including the lossless energy regenerative circuit according to another embodiment of the present invention, the energy stored in the capacitor in the discharge mode is supplied from the charge mode to the battery, There is an effect that no heat generation problem occurs.

100: current pulse generating circuit
200: Lossless energy recovery circuit
260 and 262: at least one switch
270: Transformer

Claims (9)

A circuit for a pulsed battery charger,
A receiver connected to the battery charger;
A controller for controlling a charging mode in which a current is supplied from the battery charger to the battery, and a discharging mode in which the battery is discharged;
An energy regenerating unit including at least one switch and regenerating energy stored in at least one capacitor in the charge mode in the charge mode and transferring the stored energy to the battery;
A transmitting terminal connected to the battery and providing a current supplied from the battery charger to the battery;
/ RTI > wherein the energy recovery circuit comprises: The method according to claim 1,
Wherein the at least one switch performs a PWM (Pulse Width Modulation) operation. The method according to claim 1,
Wherein the at least one switch is a pair of switches. The method of claim 3,
And the pair of switches are turned on or off at the same time. The method according to claim 1,
Wherein the energy regenerating unit includes a transformer. 6. The method of claim 5,
Wherein the transformer includes a primary side and a secondary side, the primary side is connected to the at least one switch, and the secondary side is connected to the transmitting terminal. The method according to claim 6,
Wherein the energy regenerating unit is configured such that the at least one switch and the primary side of the transformer form a discharge loop of the capacitor. 6. The method of claim 5,
Wherein the energy regenerating unit includes a pair of freewheeling diodes connected to one end and the other end of the primary side of the transformer for balancing a magnetizing current of the transformer. 6. The method of claim 5,
The energy regenerating unit disconnects the secondary side of the transformer in the discharging mode and a diode connected to one end of the secondary side of the transformer to discharge the primary side energy of the transformer in the charging mode Wherein the energy recovery circuit comprises:
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Publication number Priority date Publication date Assignee Title
GB2403609A (en) * 2003-07-01 2005-01-05 Univ Leicester Pulse charging an electrochemical device

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