JP3280641B2 - Energy transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy transfer device connected to a plurality of energy storage means and transferring energy between the plurality of energy storage means. The present invention relates to an energy transfer device suitable for averaging the voltage between both ends.

[0002]

2. Description of the Related Art Today, the development of electric vehicles is active, and the development of batteries for driving the electric vehicles is also active. As such a battery, an electric double layer capacitor is currently considered promising. On the other hand, at this stage, electric double layer capacitors
It is difficult to charge to high voltage. Therefore, in order to use a high-capacity battery capable of outputting a high voltage as a desirable electric vehicle battery, several to several tens of batteries are connected in series, and the voltage between terminals of each electric double layer capacitor is made equal. It is necessary to charge efficiently. For this reason, the applicant has proposed a device for averaging electric energy stored in a plurality of electric double layer capacitors,
A transfer device has already been proposed (Japanese Patent Application No. 11-11323).
No. 5, corresponding application publication number JP-A-2000-308271
No. ).

[0003] The transfer device 2 proposed by the applicant has already been proposed.
As shown in FIG. 6, 1 is configured to be capable of transferring energy between, for example, four capacitors Ca to Cd (hereinafter, referred to as “capacitor C” when not distinguished) as electric energy storage means. I have. Specifically, the transfer device 21 includes a transformer 22A having windings 22a to 22d (hereinafter, referred to as “winding 22” when not distinguished). The transformer 22A functions as an ideal transformer having a resistance component of each winding 22 of 0Ω, no leakage inductance, and no excitation current. The windings 22a to 22d are magnetically coupled to each other by an iron core, and the number of turns Na, Nb, Nc,
Each is wound with Nd. Further, the transfer device 2
1 includes switches Sa to Sd (hereinafter referred to as "switch S" when not distinguished) connected between the winding end side ends of the windings 22a to 22d and the negative terminals of the capacitors Ca to Cd, respectively. ing. in this case,
Each of the switches Sa to Sd is composed of, for example, an FET or a bipolar transistor, and is turned on / off in synchronization with each other by a switching control circuit (not shown).

In this transfer device 21, each winding start side end of each winding 22 and the fixed contact of each corresponding switch S are connected to both ends of capacitors Ca to Cd, and in that state, a switching control circuit is connected to each of the capacitors Ca to Cd. The switches Sa to Sd are switching-controlled. At this time, the capacitors Ca to C
d between the terminals Vca to Vcd and the number of turns Na of the winding 22
To Nd, the following equation is established. Vca: Vcb: Vcc: Vcd = Na: Nb: Nc: Nd Expression

Therefore, when the switches Sa to Sd are switched, energy is transferred between the capacitors Ca to Cd. Specifically, for example, a case where a voltage higher than the voltage defined by the above equation is applied between the terminals of the capacitor Ca will be described as an example. When each of the switches Sa to Sd is controlled to be turned on, only the terminal voltage Vca of the capacitor Ca is higher than the voltage according to the above equation, so the plus terminal of the capacitor Ca, the winding 22a, the switch Sa and A current flows through a current path including the negative terminal of the capacitor Ca. in this case,
A voltage Va having a value equal to the voltage Vca between the terminals of the capacitor Ca is generated in the winding 22a, and the other windings 22b to 22d have a voltage V corresponding to a ratio of the winding number Na to the winding number Na.
b to Vd respectively occur.

In this case, the voltages Vb to Vd are higher than the corresponding inter-terminal voltages Vcb to Vcd. Therefore, a current based on each of the voltages Vb to Vd continues to flow through the current path including the winding 22, the capacitor C, and the switch S, and charges each of the capacitors Cb to Cd. Next, charging is sequentially stopped from the capacitor C in which the voltages Vb to Vd and the corresponding inter-terminal voltages Vcb to Vcd have reached the same voltage, and the above expression is finally satisfied. As a result, the capacitor Ca is replaced by another capacitor C
Distributed transfer of energy to b to Cd is performed.

As described above, according to the transfer device 21,
Although the configuration is simple, the voltages between the terminals of the capacitors Ca to Cd can be equalized. For this reason, the capacitors Ca to Cd are connected in series, and the switches Sa to Sd are synchronously switched in a state where the charging voltage is supplied between both ends thereof.
To Cd can be efficiently charged, so that a high-voltage and large-capacity battery can be configured.

[0008]

However, the transfer device 21 proposed by the present applicant has the following improvements. In other words, when a large number of capacitors C are connected in series to form a high-voltage output type battery of a hundred and several tens of volts, two connection cables must be connected to both ends of each capacitor C in the transfer device 21. . For this reason, the cost of the wiring work of the connection cable rises, and a space for storing the connection cable must be secured, and improvement of these points is desired.

When the electric double layer capacitor is used as a battery, when the charge voltage of each electric double layer capacitor varies extremely, when the switch S is switched, the electric charge from the electric double layer capacitor with the higher charge voltage to the electric charge with the lower charge voltage is reduced. A large current may flow through the double-layer capacitor. In such a case, since a large current flows through the switch S, there is a possibility that the current of the switch S may be destroyed in some cases, and improvement of this point is also desired.

SUMMARY OF THE INVENTION The present invention has been made to solve such an improvement, and has as its main object to provide an energy transfer device capable of reducing the number of wires to be connected to the energy storage means. Another object of the present invention is to provide an energy transfer device of the type described above.

[0011]

Means for Solving the Problems] energy transfer device of claim 1, wherein to achieve the above object, double in series connected
Transfer energy between a number of energy storage
And each switch is synchronized with each other
A plurality of switch means to be controlled
At least each switch means when controlled to the on state
Are connected in parallel to each energy storage means via
Windings are connected in series and
An intermediate tap is formed at the connection point of each winding connected in a row
An energy transfer device comprising a transformer and
The connection point between the connected energy storage
Connected with one connection cable via switch means
And the switch is controlled to the on state.
Energy connected to one connection cable
The current path flowing through the energy storage means is
Also used to characterized the Rukoto.

According to a second aspect of the present invention, there is provided the energy transfer device according to the first aspect, further comprising current detection means for detecting a current flowing through the switch means, wherein the switch means detects a current value detected by the current detection means. The switching is stopped when the value exceeds a predetermined value.

According to a third aspect of the present invention, in the energy transfer device of the first or second aspect, the overcurrent protection means is connected in series in the series circuit.

According to a fourth aspect of the present invention, in the energy transfer device according to any one of the first to third aspects, the energy storage means is a secondary battery or a capacitor. In this case, the secondary battery includes a lithium ion battery or a lithium polymer battery, and the capacitor includes an electric double layer capacitor. Note that the energy storage means may be a composite product in which a secondary battery and a capacitor are mixed.

According to a fifth aspect of the present invention, in the energy transfer device according to any one of the first to fourth aspects, the switch means comprises a field effect transistor or a bipolar transistor.

According to a sixth aspect of the present invention, there is provided the energy transfer apparatus according to any one of the first to fifth aspects, further comprising a separately excited oscillation circuit for controlling switching of the switch means. I do.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of an energy transfer device according to the present invention will be described with reference to the accompanying drawings. Note that the same components as those of the transfer device 21 are denoted by the same reference numerals, and redundant description will be omitted.

First, the operating principle of the energy transfer device according to the present invention will be described with reference to FIG.

As shown in FIG. 1, the transfer device 1 includes, for example, four serially connected electric energy storage means.
It is configured to be able to transfer electric energy between the two capacitors Ca to Cd. Specifically, the transfer device 1
Includes a transformer 2A, switches Sa to Sd, and a switching control circuit 11. In this case, transformer 2
A has windings 2a to 2d (hereinafter, when not distinguished,
The windings 2 are connected in series, and intermediate taps Ta to Tc (hereinafter, referred to as “intermediate taps T” when not distinguished) are formed at connection points of the respective windings 2. The windings 2a to 2d are magnetically coupled to each other by an iron core, and are wound with the number of turns Na, Nb, Nc, and Nd, respectively. In addition, this transformer 2A
Each of the windings 2 has a resistance component of 0Ω, has no leakage inductance, and functions as an ideal transformer having no exciting current.

On the other hand, each switch S is constituted by, for example, an FET or a bipolar transistor, and is kept in a normally open state when switching off. Also, the switches Sa to Sc
Has one end connected to each of the intermediate taps Ta to Tc of the transformer 2A, and the other end connected to a connection point of each capacitor C. Further, the switch Sd
One end is connected to the winding end side terminal of the winding 2d, and the other end is connected to the negative side terminal of the capacitor Cd as a ground potential. The switching control circuit 11 performs on / off control of each switch S in synchronization with each other.

In the transfer device 1, when each switch S is switched by the switching control circuit 11,
Energy is dispersed and transferred between the capacitors C such that the above-mentioned formulas are satisfied with respect to the voltages Vca to Vcd between the terminals of the capacitors Ca to Cd. Accordingly, by forming the same number of turns of each winding 2, the voltages Vca to Vcd between terminals of each capacitor C can be equalized. Since the operation principle is the same as that of the transfer device 21, detailed description of the operation thereof is omitted.

In this transfer device 1, the winding start side terminal of the winding 2a is connected to the plus side terminal of the capacitor Ca, and the other ends of the switches Sa to Sc are connected to the connection points of the capacitors Ca and Cb, the capacitors Cb and Capacitor C
c, and the capacitors Cc and C
d, and the other end of the switch Sd is connected to the negative terminal of the capacitor Cd. Next, the switching control circuit controls the switching of each of the switches Sa to Sd. Note that the output voltage VO is supplied from both ends of the capacitors Ca to Cd to a load (not shown) while the switches S are being switched and during any period during which the switching is stopped.

At this time, in the transfer device 1, the transfer device 21
Similarly, the energy is dispersed and transferred between the capacitors Ca to Cd. For example, when the inter-terminal voltage Vca of the capacitor Ca is higher than the voltage defined by the above equation, when each of the switches Sa to Sd is controlled to the ON state, the positive terminal of the capacitor Ca, the winding 2
a, middle tap Ta, switch Sa and capacitor C
The current flows through the current path composed of the negative terminal of “a”.
In this case, the terminal voltage Vc of the capacitor Ca is applied to the winding 2a.
a, a voltage Va equal in value to the other windings 2b to 2d
Has a voltage V of a value corresponding to the ratio with the number of turns Na of the winding 2a.
b to Vd respectively occur. Specifically, a voltage Vb of a value (voltage Va × Nb / Na) is generated in the winding 2b,
A voltage Vc of a value (voltage Va × Nc / Na) is applied to the winding 2c.
Is generated, and the value (voltage Va × Nd / Na) is applied to the winding 2d.
Voltage Vd is generated.

At this time, since the voltages Vb to Vd are higher than the corresponding inter-terminal voltages Vcb to Vcd, the current based on the voltages Vb to Vd is applied to the winding 2, the capacitor C and the switch. The capacitors Cb to Cd are charged by continuing to flow through the current path made of S. In this case, for example, the intermediate tap Tb and the capacitor Cb,
A connection line connecting the connection points of Cc also serves as a current path flowing through the capacitors Cb and Cc. Next, each of the voltages Vb to Vd and the corresponding terminal-to-terminal voltage Vcb
The charging is sequentially stopped from the capacitor C which has reached a voltage equal to .about.Vcd, and finally the above expression is satisfied.
As a result, the other capacitors Cb to Cb
Distributed transfer of energy to d is performed, and the above equation holds.

As described above, according to the transfer device 1, the connection line connecting the intermediate tap Ta and the connection point of the capacitors Ca and Cb is composed of the capacitor Ca and the capacitor Cb.
Similarly, the connection line connecting the other intermediate tap T and the connection point of the other capacitors C, C also serves as the current path flowing through the two capacitors C, C. Therefore, when N capacitors C are connected in series, the number of connection cables to be connected to these capacitors C is (N + 1), and in the same example, 2 · N
The number of connections can be reduced as compared with the book transfer device 21. In particular, when the number of the capacitors C is large, the number of the connection cables can be almost halved. As a result, the wiring operation cost can be reduced and the wiring material cost can be halved.

Next, an actual circuit configuration using a realistic transformer will be described with reference to FIG. Hereinafter, the same components as those of the transfer device 1 will be denoted by the same reference numerals, and redundant description will be omitted, and redundant description of the same operation will be omitted.

As shown in FIG. 1, the transfer device 1A includes a transformer 2B. The transformer 2B has four windings 2a to 2d wound with the same number of turns Na to Nd.
And a reset winding 2e wound with, for example, four times the winding number Ne of the winding 2a (hereinafter referred to as "winding 2" when the windings 2a to 2e are not distinguished), and each winding 2 Intermediate taps Ta to Tc, Te (hereinafter, referred to as
When no distinction is made, “intermediate tap T” is formed. In this case, the windings 2a to 2e are magnetically coupled to each other by an iron core. In addition, the transfer device 1A includes a fuse Fa (or Fb to Fd) connected in series between each switch Sa (or Sb to Sd) and a connection terminal to the capacitor C. ) And current transformer CTa
(Or CTb to CTd, hereinafter referred to as “current transformer CT” when not distinguished), a voltage detection circuit 12, a current detection circuit 13, and a diode D1 for releasing reset current. Note that a configuration including only one of the fuse F and the current transformer CT may be employed.

The fuse F corresponds to the overcurrent protection means in the present invention. When an overcurrent exceeding the rated maximum current of the switch S is about to flow, the fuse F is cut off by the current, thereby breaking the current of the switch S. And wiring and transformer 2
Prevents burning of B. The current transformer CT corresponds to a current detection unit in the present invention, detects a current value flowing through the primary winding CTaa (or CTba to CTda) at the time of switching, and outputs a secondary winding CTab (or CTbb).
To CTdb). The voltage detection circuit 12 detects the voltage between both ends of the capacitors Ca to Cd connected in series,
For example, 60% of the sum of the rated charging voltages of the capacitors C
By outputting a detection signal SD1 to the switching control circuit 11 when the voltage exceeds a predetermined voltage corresponding to the above, each switch S is switched by the switching control circuit 11. When the current value output from the secondary winding of each current transformer CT exceeds a predetermined value (for example, 90% of the rated current of the switch S), the current detection circuit 13
By outputting the detection signal SD2 to the switching control circuit 11, the switching control circuit 11 stops switching of each switch S.

In the transfer device 1A, the capacitors Ca to
When Cd is charged to a predetermined voltage by a charger (not shown), the voltage detection circuit 12 outputs a detection signal SD1 to the switching control circuit 11. Next, the switching control circuit 1
1 switches the respective switches S synchronously, thereby averaging the voltage between the terminals of each capacitor C in the same manner as the transfer device 1. At this time, since an exciting current flows in the actual transformer 2B, the transformer 2B is magnetized when the switch S is turned on. Next, when each switch S is controlled to be in the off state, the windings 2a to 3e are magnetically coupled by a common iron core. Therefore, the windings 2a to 3e are connected to the windings 2a to 3e based on the excitation energy of the transformer 2B. As shown in FIG.
a to Ve respectively occur. In this case, each voltage Va ~
The current based on Vd is blocked from passing by each of the switches Sa to Sd controlled to be in the off state. Therefore, the current based on the voltage Ve is changed to the intermediate tap Te,
Capacitors Ca to Cd, diode D1, and winding 2
By flowing through the current path composed of the winding start side terminal of e, the capacitors Ca to Cd are charged and the transformer 2b is magnetically reset.

In this case, since the turns ratio of the winding 2e to the winding 2a (Ne / Na) is 4, the switch S is set to 50%
By switching at the duty, theoretically, all the excitation energy of the transformer 2B is released within the OFF period of the switch S, and magnetic saturation of the transformer 2B is reliably prevented. As a result, all of the energy stored in the transformer 2B is dispersed and transferred to each capacitor C. On the other hand, when the output voltage VO is supplied to the load in a state where the charging is stopped, and the voltage between the terminals of the capacitors Ca to Cd falls below a predetermined voltage, the voltage detection circuit 12 switches the switching control circuit of the detection signal SD1. 11
Stop output to. In this case, the switching control circuit 11 stops the switching of the switch S, thereby reducing the loss at the time of the switching of the switch S.

On the other hand, when the voltage between terminals of each capacitor C varies extremely, a large current may flow from the capacitor C having a high terminal voltage to the capacitor C having a low terminal voltage when the switch S is switched. In such a case, the current transformer CT detects the current and outputs the current to the current detection circuit 13. In this case, the current detection circuit 13
However, when the current flowing through the primary winding of the current transformer CT exceeds a predetermined current value, the switching control circuit 11 outputs the detection signal SD2 to stop the switching of the switch S. This prevents current destruction of each switch S and burning of the wiring and the transformer 2B.
When a leakage transformer is used for the transformer 2B, when a current flows through each of the windings 2 when the switch S is turned on, the current flows through the leakage inductance, so that the peak value of the current can be appropriately adjusted. Can be limited to Further, when an excessive current exceeding the maximum rated current of the switch S is going to flow through the switch S, the fuse F provided in the current path is cut, thereby breaking the switch S or causing the wiring to fail. In addition, burning of the transformer 2B is prevented. Thereby, the transfer device 1A having high reliability can be configured.

Next, a transfer device 1B according to another embodiment will be described with reference to FIG. In the transfer device described below, differences from the transfer device 1A will be mainly described, and illustration of circuit components that are operatively common such as the switching control circuit 11 will be omitted.

The transfer device 1B includes a transformer 3 in place of the transformer 2B in the transfer device 1A. The transformer 3 includes windings 3a and 3b connected in series and provided with an intermediate tap T1 at the connection point, and windings 3c and 3d connected in series and provided with an intermediate tap T2 at the connection point.
And the intermediate taps T3, T4
Are wound while being separated from each other and magnetically coupled to each other. In this case, the windings 3a to 3f are wound with the same number of turns Na to Nf, and the winding 3g is wound with twice the number of turns Ng of the winding 3e. Further, the transfer device 1B includes diodes D2 to D4 for emitting the excitation energy of the transformer 3.

In the transfer device 1B, when the switch S is controlled to be switched on, similarly to the transfer device 1A, the capacitor C having a voltage higher than the voltage defined by the following equation is directed from the positive terminal to the negative terminal. As a result, the energy is transferred so that the voltages Vca-VCf between the terminals of the capacitors Ca-Cf satisfy the following equations. On the other hand, when the switch S is switched off, based on the voltages Vc and Vd induced in the windings 3c and 3d, the current I1 is supplied to the winding end terminal of the winding 3d, the diode D2, the capacitors Ca and Cb, and the winding 3c.
Flows through the current path composed of the winding start side terminal. Similarly, based on the voltages Ve and Vf induced in the windings 3e and 3f, the current I2 is supplied to the winding end terminal of the winding 3f, the diode D3, the capacitors Cc and Cd, and the winding start terminal of the winding 3e. Flows through the current path consisting of
g based on the voltage Vg induced on the winding 3
The current flows through a current path consisting of a winding end terminal of g, capacitors Ce and Cf, a diode D4, and a winding start terminal of the winding 3g. Thereby, the excitation energy of the transformer 3 is dispersed and discharged to the series circuit of the capacitors Ca and Cb, the series circuit of the capacitors Cc and Cd, and the series circuit of the capacitors Ce and Cf. Vca: Vcb: Vcc: Vcd: Vce: Vcf = Na: Nb: Nc: Nd: Ne: Nf ... Equation

As a result, when the switch S is turned off, the excitation energy of the transformer 3 is transferred to the series circuit of the pair of capacitors C and C having the lowest voltage between both ends, and thereafter, until the release of the excitation energy is completed. , The capacitors are sequentially transferred preferentially from the series circuit of the pair of capacitors C and C having the lower voltage. For this reason, the excitation energy of the transformer 3 can be efficiently released when the switch S is switched off, as compared with the transfer device 1A in which the energy is collectively released to the series circuit of all the capacitors Ca to Cd. .

Next, a drive system for controlling the switching of each switch S will be described with reference to FIG.

The transfer device 1C shown in FIG. 4 is a device for controlling the on / off of the switch S by the separately excited oscillation method, and the windings 4a to 4c are connected in series, and the intermediate taps Ta, The transformer 4 provided with Tb, the switches Sa to Sc composed of FETs, and the gate of each switch S
The secondary windings 5a to 5c are connected between the sources, and the primary winding 5d is connected to the capacitors Ca to Cc via the switch S1.
And a transformer 5 connected in parallel to the series circuit. In this case, the switch S1 is formed of, for example, an FET or a bipolar transistor, and is turned on / off in synchronization with a switching synchronization signal output from a switching control circuit outside the device.

In the transfer device 1C, when the switch S1 is turned on / off, a current flows through the primary winding 5d of the transformer 5, and at that time, a voltage is induced in each of the secondary windings 5a to 5c. Next, this induced voltage is applied to each of the switches Sa to Sc.
, The switches Sa to Sc are on / off controlled in synchronization with the switching frequency of the switch S1. Therefore, by inputting a switching synchronization signal from outside the device, all the switches Sa
The switching on / off for .about.Sc can be reliably controlled in synchronization with the switching synchronization signal.

As described above, the transfer devices 1, 1A to
According to 1C, since the voltage between the terminals of each capacitor C can be charged or discharged while maintaining the voltage according to the above formula or the above formula, more energy can be stored in each capacitor C, Energy can be efficiently released from each capacitor C. Further, by providing an intermediate tap T at a connection point of the windings of each transformer and connecting the intermediate tap T to a connection point of the capacitors C and C, the number of connection cables to be connected to the capacitor C can be reduced. As a result, the wiring operation cost can be reduced and the wiring material cost can be halved. In addition, since the number of circuit components is small, the transfer devices 1 and 1A to 1C can be configured to be small and inexpensive.

Note that the present invention is not limited to the above-described embodiments of the present invention, and the configuration thereof can be changed as appropriate. For example, the method of supplying the energy stored in the capacitor C to the load is not limited to the above-described embodiment.
As shown in (1), the load RL can be supplied from both ends of each capacitor C (for example, the capacitor Cc in the figure) or from both ends of an arbitrary number of capacitors C. As shown in the figure, when energy is supplied to the load RL from both ends of the specific capacitor Cc, a large current flows through the capacitor Cc because the voltage between the terminals of the capacitor Cc greatly decreases. Therefore, it is preferable that the wire diameter of the winding 2 (the winding 2c in this example) connected in series to the capacitor Cc be larger than the wire diameter of the other windings 2.

Further, the present invention is not limited to the use for averaging the voltage between terminals of the capacitor C as each cell of the battery for an automobile. For example, in a power storage system in which a large-capacity power storage means is connected in series, for example, when averaging the voltages at both ends of the large-capacity power storage means, or maintaining the voltage at a voltage corresponding to the turns ratio of the windings in the transformer, for any use. Of course, it can be applied to

[0042]

As described above, according to the energy transfer device of the first aspect, the energy storage devices connected in series are connected.
The connection point between the stages and the intermediate tap are connected via switch means.
Connected by one connection cable and switch means
Connected to one connection cable when
The current flowing through the two energy storage means connected
By using a single connection cable for the path, the number of connection cables to be connected to the energy storage means can be reduced. As a result, the wiring operation cost and the wiring material cost can be reduced, and the cost can be reduced accordingly. Ru it is possible to reduce the space.

Furthermore, according to the energy transfer device of the second aspect, the switching means can stop the switching when the current value detected by the current detecting means exceeds a predetermined value, thereby destructing the current of the switching means, Burnout of wiring and transformer can be prevented.

Further, according to the energy transfer device of the third aspect, the provision of the overcurrent protection means makes it possible to reliably prevent the current destruction of the switch means and the burning of the wiring and the transformer.

According to the energy transfer device of the fourth aspect, since the energy storage means is constituted by the secondary battery or the capacitor, the voltage across the secondary battery or the capacitor used in various batteries can be averaged. Therefore, the battery can be charged and discharged with high efficiency.

Further, according to the energy transfer device of the fifth aspect, since the switch means is constituted by a field effect transistor or a bipolar transistor, the switch means can be formed at a low cost and the power loss at the time of switching can be further reduced. Can be reduced.

According to the energy transfer device of the present invention, since the separately-excited oscillation circuit for controlling the switching of the switch means is provided, all the switches can be inputted by inputting a switching synchronization signal from outside the device. The switching on / off of the means can be controlled in such a manner as to be reliably synchronized with the switching synchronization signal.

[Brief description of the drawings]

FIG. 1 shows a transfer device 1 for explaining the operation principle of the present invention.
FIG.

FIG. 2 is a circuit diagram of a transfer device 1A according to the embodiment of the present invention.

FIG. 3 is a circuit diagram of a transfer device 1B according to another embodiment of the present invention.

FIG. 4 is a circuit diagram of a transfer device 1C according to another embodiment of the present invention.

FIG. 5 is a circuit diagram of the transfer device 1 showing a method of supplying stored energy of the capacitor C to a load.

FIG. 6 is a circuit diagram for explaining the operation principle of the transfer device 21 already proposed by the applicant.

[Explanation of symbols]

 1, 1A-1C Transfer device 2A, 2B, 3-5 Transformer 2a-2d, 3a-3f, 4a-4c Winding 2e, 3g Reset winding 12 Voltage detection circuit 13 Current detection circuit Ca-Cf Capacitor CTa-CTd Current Transformer Fa-Fd Fuse S1, Sa-Sf Switch Ta-Tc, T1-T4 Intermediate tap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-228421 (JP, A) JP-A-60-106363 (JP, A) JP-A-60-106364 (JP, A) JP-A 60-106364 204265 (JP, A) JP-A-62-196071 (JP, A) JP-A-1-321860 (JP, A) JP-A-3-27772 (JP, A) JP-A-5-159755 (JP, A) JP-A-6-78537 (JP, A) JP-A-6-86548 (JP, A) JP-A-6-261451 (JP, A) JP-A-6-261546 (JP, A) JP-A-7-322516 (JP, A) JP-A-10-52042 (JP, A) JP-A-10-84627 (JP, A) JP-A-11-103534 (JP, A) JP-A-11-103535 (JP, A) Open 2000-308271 (JP, A) US Patent 5,594,320 (US, A) US Patent 5,664,041 (US, A) US Patent 5,767,660 (US, A) U.S. Pat. No. 5,817,729 (US, A) U.S. Pat. 5,595,241 (US, A) WO 98/42065 (WO, A1) EP 432639 (EP, A2) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H01F 30/02 H01M 2/00-2/08 H01M 10/42-10/48 H02J 1/00-1/16 H02J 7/00-7/12 H02J 7/34-7/36 H02J 15 / 00 H02M 3/24-3/338

Claims (6)

(57) [Claims] A plurality of energy storage devices connected in series.
A plurality of stages are configured to be able to transfer energy between stages, and each of which is switching-controlled in synchronization with each other.
Switch means, and each of the switch means is controlled to an on state
At least through the respective switch means when
Windings connected in parallel to each energy storage means
And the plurality of windings are connected in series and the
An intermediate tap is formed at the connection point of each winding connected in series.
And a connection point between the series-connected energy storage means.
The intermediate tap is connected to one of the contacts via the switch means.
Connection means, and the switch means is turned off.
Connected to the single connection cable when
The electricity flowing through the two energy storage means
Energy transfer device, characterized that you alternate the flow path the one connection cable. And a current detecting means for detecting a current flowing through the switching means, wherein the switching means stops switching when a current value detected by the current detecting means exceeds a predetermined value. The energy transfer device according to claim 1, wherein: 3. The energy transfer device according to claim 1, wherein an overcurrent protection unit is connected in series in the series circuit. 4. The apparatus according to claim 1, wherein said energy storage means is a secondary battery or a capacitor.
An energy transfer device according to any one of the above. 5. The energy transfer device according to claim 1, wherein said switch means comprises a field effect transistor or a bipolar transistor. 6. The energy transfer device according to claim 1, further comprising a separately-excited oscillation circuit that controls switching of said switch means.