Charge and discharge device

Abstract

To solve a problem in which, in a hybrid vehicle, electric power generated by a generator that generates power by the rotation of a wheels is charged in, for example, an ion battery and used as auxiliary power for the engine, however, it is inefficient because chargeable power generated by the rotational force of the wheel is not used while the generated power is used as auxiliary power, and since a current electric vehicle relies only on power stored in a storage battery, the capacity of the storage battery is very large, the traveling distance is short, and the weight and volume are large, resulting in inefficiency.SOLUTION: A charge / discharge device according to the present invention includes: first and second chargers / dischargers 1 and 6 that alternately discharge and alternately charge, respectively; and a control device 18 that switches charge / discharge states of the first and second chargers / dischargers 1 and 6 when a retained power amount of the first charger / discharger 1 becomes equal to or less than a predetermined amount during discharging, or when a retained power amount of the second charger / discharger 6 becomes equal to or greater than a predetermined amount during charging. Thereby, capacities of the first and second chargers / dischargers 1 and 6 are reduced by effectively using chargeable power.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a charging and discharging device used, for example, in electric vehicles, electric motorcycles, Electric bicycles, etc. and the like.

Background Art

[0002] Currently, for example, electric vehicles or hybrid vehicles focus on the performance development or miniaturization of batteries such as ion batteries and solid batteries mounted thereon, and little attention is paid to their efficient utilization.

Disclosure of the Invention

Problems to be Solved by the Invention

[0003] For example, a hybrid vehicle charges the generated power of a generator that generates power by the rotation of wheels with, for example, an ion battery and uses it as auxiliary power for the engine. However, while using this auxiliary power, there is a problem that the generated power that can be charged by the rotational force of the wheels is not used and the efficiency is poor. In addition, current electric vehicles rely only on the stored power of the storage battery, so the capacity of the storage battery is very large, the driving range is short, and the weight and volume are large, which is inefficient.

Means for Solving the Problems

[0004] The present invention includes first and second chargers that discharge alternately and charge alternately, and a control device that switches the charging and discharging states of the first and second chargers when the amount of power stored in the first charger becomes less than or equal to a predetermined amount during the discharge of the first charger, or when the amount of power stored in the second charger during charging becomes greater than or equal to a predetermined amount, thereby effectively using the chargeable power and reducing the size of the capacities of the first and second chargers.

[0005] FIG. 1 is a block diagram showing an in-vehicle embodiment of the present invention. In FIG. 1, the first charger 1 includes a positive terminal 2 and a negative terminal 3, discharges to a motor 4 that drives wheels, and charges the power from a generator 5 that generates electricity by the rotation of the wheels. The second charger 6 includes a positive terminal 7 and a negative terminal 8, discharges to a motor 4 that drives wheels, and charges the power from a generator 5 that is driven by the rotation of the wheels. The first state-of-charge detection device 9 detects the state of charge of the first charger 1, and has a terminal 10 that generates an output when the state of charge is full, and when the state of charge of both the first and second chargers 1 and 6 is full, a terminal 11a that generates an output to put the first charger 1 in a discharge state and the second charger 6 in a charge state, a terminal 11b that generates an output when the state of charge of the first charger 1 slightly decreases after the output of terminal 11a, a terminal 12 that generates an output to forcibly switch the charge and discharge states of the first and second chargers 1 and 6 when the first charger 1 is in a discharge state and its state of charge decreases, and a terminal 13 that generates an output when the state of charge of the first charger 1 is near the minimum state. The second state-of-charge detection device 14 detects the state of charge of the second charger 6, and has a terminal 15 that generates an output when the state of charge is full, a terminal 16 that generates an output to forcibly switch the charge and discharge states of the first and second chargers 1 and 6 when the second charger 6 is in a discharge state and its state of charge decreases, and a terminal 17 that generates an output when the state of charge of the second charger 6 is near the minimum state. The control device 18 opens and closes switches 19, 20, 21, 22, 23, 24, 25, 26 according to the outputs of the first state-of-charge detection device 9 and the second state-of-charge detection device 14, and controls the switching of the charge and discharge states of the first and second chargers 1 and 6. The indicator lamp 27 lights up according to the outputs of terminals 13 and 17.

[0006] The charging circuits of the first charger 1 and the second charger 6 are formed as follows. The charging circuit of the first charger 1 is composed of generator 5 → switch 19 → positive terminal 2 → negative terminal 3 → switch 22 → generator 5, and the charging circuit of the second charger 6 is composed of generator 5 → switch 23 → positive terminal 7 → negative terminal 8 → switch 26 → generator 5.

[0007] The discharge circuits of the first charger 1 and the second charger 6 are formed as follows. The discharge circuit of the first charger 1 is composed of the positive terminal 2 → switch 20 → motor 4 → switch 21 → negative terminal 3, and the discharge circuit of the second charger 6 is composed of the positive terminal 7 → switch 24 → motor 4 → switch 25 → negative terminal 8.

[0008] Next, this operation will be described. When the vehicle starts, the power storage amounts of the first and second chargers 1 and 6 are full by a household power supply or the like. The terminal 11a of the first power storage amount detection device 9 generates an output, and based on this output, the control device 18 controls the switch to form the discharge circuit of the first charging and discharging device 1, puts the first charging and discharging device 1 in the discharge state, and drives the motor 5. Also, the control device 18 controls the switch to form the charging circuit of the second charger 6, and charges the second charging and discharging device 6 with the generated power from the generator 5.

[0009] When the power storage amount of the first charging and discharging device 1 slightly decreases in this state and the terminal 11b of the first power storage amount detection device 9 generates an output, based on this output, the control device 18 controls the switch to form the charging circuit of the first charging and discharging device 1 to put the first charging and discharging device 1 in the charging state. At the same time, the control device 18 controls the switch to form the discharge circuit of the second charging and discharging device 6, and forcibly switches the second charging device 6 to the discharge state.

[0010] When the first charging and discharging device 1 is in the charging state and its power storage amount becomes full, the terminal 10 of the first power storage amount detection device 9 generates an output. Based on this output, the control device 18 controls the switch to form the discharge circuit of the first charging and discharging device 1 to put the first charging and discharging device 1 in the discharge state and drive the motor 4. Also, the control device 18 controls the switch to form the charging circuit of the second charging device 6 to put the second charging and discharging device 6 in the charging state.

[0011] When the power storage amount of the first charge / discharge device 1 in the discharge state decreases and the terminal 12 of the first power storage amount detection device 9 generates an output, based on this output, the control device 18 controls the switch to form the charging circuit of the first charge / discharge device 1 to charge the first charge / discharge device 1, and at the same time controls the switch to form the discharging circuit of the second charging device 6 to switch the second charging device 6 to the discharging state.

[0012] Also, when the power storage amount of either the first or second charge / discharge device 1, 6 drops to the lowest state, an output is generated at either terminal 13 or 17 of either the first or second power storage amount detection devices 9, 14, causing the indicator lamp 28 to light up, indicating that the power storage amounts of the first and second charge / discharge devices 1, 6 are low.

[0013] In the above embodiment, the charging of the first and second charge / discharge devices 1, 6 is described only using the generated power from the generator 5. However, a thin and transparent perovskite solar cell composed only of coating a liquid raw material can be painted on the roof, bonnet, etc. of the vehicle body, and the generated power can be used for charging.

[0014] Also, in the above embodiment, an in-vehicle charger is described. However, it goes without saying that any equipment using a charge / discharge device, such as solar power generation, wind power generation, geothermal power generation, tidal power generation, etc., can be supported.

Advantages of the Invention

[0015] By providing the first and second charge / discharge devices 1, 6 that alternately switch between the charge and discharge states according to the power storage amount, the present invention can efficiently utilize the power generated at all times. Therefore, the capacities of the first and second charge / discharge devices 1, 6 can be reduced, and the efficient utilization of the generated power becomes possible.

Brief Description of the Drawings

Figure 1

Explanation of Reference Numerals

Claims

【Claim 1】 First and second chargers that discharge and charge alternately, respectively; A first terminal that generates an output to put the first charger in a discharging state and the second charger in a charging state when the stored power amounts of both the first and second chargers are full; A second terminal that generates an output when the stored power amount of the first charger becomes equal to or less than a first predetermined amount after the output of the first terminal is generated; A control device that, when the second terminal generates an output during the discharging of the first charger, switches the first charger to a charging state and the second charger to a discharging state, and switches the charging and discharging states of the first and second chargers respectively when the first charger is fully charged or when the stored power amount of the second charger becomes equal to or less than a second predetermined amount. A charging and discharging device characterized by comprising the same.

Images