TWI842176B - Power conversion device for ac and dc - Google Patents

Abstract

Disclosed is a power conversion device for AC and DC comprises: a solar-panel-end connector, a control device, a voltage sensor, a power storage device, a solar charging switch, a utility-power-end connector, an AC-DC converter, a DC-AC converter and a utility power charging switch. When the solar panel supplies power, the solar charging switch is turned on so that the power from the solar panel charges the power storage device through the solar charging switch. When the utility power supplies power, the utility power charging switch is turned on so that the power from utility power is converted from AC to DC. When the solar panel does not generate electricity and the utility power fails, the control device controls the power storage device to supply power to the utility power through the DC-AC converter.

Description

AC and DC power conversion equipment

The present invention relates to a power storage device, and in particular to an AC and DC power conversion device.

Energy storage equipment is a device that can store energy for later use to reduce the imbalance between energy demand and energy production. Larger energy storage equipment is often used in charging stations or electric vehicles. Such energy storage equipment is often charged by the mains to power the electric vehicle. However, when there is a power outage, it is difficult for the energy storage equipment to avoid or reduce the impact of the power outage, causing inconvenience to users.

Therefore, the purpose of the present invention is to provide an AC and DC power conversion device that can maintain power as much as possible during normal times and supply the stored power back to the mains during a power outage.

The present invention solves the problems of the prior art by providing an AC and DC power conversion device, comprising: a solar panel end connector for connecting to a solar panel; a control device; a voltage sensor connected to the solar panel end connector and the control device to sense whether the solar panel is supplying power; a power storage device; a solar charging switch connected between the solar panel end connector and the power storage device, and connected to the control device and controlled by the control device; a mains end connector for connecting to the mains; an AC-DC converter connected to the mains end connector; a DC-AC converter connected between the mains end connector and the power storage device; and a mains charging switch connected to the AC-DC converter. The device is connected to the control device and is controlled by the control device, wherein when the voltage sensor senses that the solar panel is supplying power, the control device controls the solar charging switch to be turned on, so that the power from the solar panel flows to the storage device through the solar charging switch to charge the storage device; when the mains is supplying power, the control device controls the mains charging switch to be turned on, so that the mains charges the storage device via the AC-DC converter; when the solar panel is not generating power and the mains is out of power, the control device controls the storage device to supply power to the mains via the DC-AC converter.

In one embodiment of the present invention, an AC and DC power conversion device is provided, wherein the power storage device is a battery of a charging station, which is connected to an electric vehicle to supply power to the electric vehicle.

In one embodiment of the present invention, an AC and DC power conversion device is provided, wherein the power storage device is a battery of an electric vehicle.

In one embodiment of the present invention, an AC and DC power conversion device is provided, further comprising a charge and discharge protection module connected to the power storage device and the control device.

In one embodiment of the present invention, an AC and DC power conversion device is provided, wherein at most one of the solar charging switch and the AC charging switch is turned on.

Through the technical means adopted by the AC and DC power conversion device of the present invention, the AC and DC power conversion device has two power sources, solar panels and city power, so that the AC and DC power conversion device of the present invention can maintain power as much as possible in normal times, and when there is a power outage, the stored power can be supplied back to the city power. In this way, the AC and DC power conversion device of the present invention can avoid or reduce the impact caused by power outages.

The following describes the implementation of the present invention based on Figure 1. The description is not intended to limit the implementation of the present invention, but is an example of the present invention.

As shown in FIG. 1 , an AC and DC power conversion device 100 according to an embodiment of the present invention comprises: a solar panel-end connector 1, a control device 2, a voltage sensor 3, a power storage device 4, a solar charging switch 5, a mains-end connector 6, an AC-DC converter 7, a DC-AC converter 8, a mains charging switch 9, and a charge-discharge protection module 10.

In this embodiment, the AC and DC power conversion device 100 is used in a mobile charging and swapping station. In other embodiments, the AC and DC power conversion device 100 can also be used in electric vehicles or other electrical equipment.

The solar panel end connector 1 is used to connect to a solar panel S. The solar panel end connector 1 is a connector seat or a connector head.

The control device 2 is a microcontroller (MCU) that receives voltage information from the voltage sensor 3 and controls the solar charging switch 5 to be turned on or off accordingly. In addition, the control device 2 also controls the solar charging switch 5 and the charge-discharge protection module 10.

The voltage sensor 3 is connected to the solar panel end connector and the control device. The voltage sensor 3 senses the solar panel S to obtain voltage information so that the control device 2 can determine whether the solar panel S is supplying power.

In this embodiment, the power storage device 4 is a battery of a charging station, connected to an electric vehicle E to supply power to the electric vehicle E. The electric vehicle E may be an electric car, an electric motorcycle, an electric bicycle, etc. In other embodiments, the power storage device 4 may also be a battery of the electric vehicle E or other electrical equipment.

The solar charging switch 5 is connected between the solar panel end connector 1 and the power storage device 4. The solar charging switch 5 is connected to the control device 2 and is controlled by the control device 2. In FIG. 1 , the solar charging switch 5 is turned on, so that the solar panel end connector 1 is electrically connected to the power storage device 4. When the solar charging switch 5 is turned off, the electrical connection between the solar panel end connector 1 and the power storage device 4 is interrupted.

The mains connector 6 is used to connect to the mains P. The mains connector 6 is a connector socket or a connector head.

The AC-DC converter 7 is connected to the mains connector 6 to convert the mains power into power that can charge the power storage device. In this embodiment, the AC-DC converter 7 converts 110V AC power into 12V DC power.

The DC-AC converter 8 is connected between the mains connector 6 and the power storage device 4 to convert the electricity charged by the power storage device 4 into electric energy that can be supplied to the mains P. In this embodiment, the AC-DC converter 7 converts 12V DC power into 110V AC power.

The mains charging switch 9 is connected between the AC/DC converter 7 and the power storage device 4. The mains charging switch 9 is connected to the control device 2 and is controlled by the control device 2. In FIG. 1 , the mains charging switch 9 is disconnected, so that the electrical connection from the mains end connector 6 to the power storage device 4 through the AC/DC converter 7 is interrupted. When the solar charging switch 5 is turned on, the solar panel end connector 1 is electrically connected to the power storage device 4 through the AC/DC converter 7.

When the voltage sensor 3 senses that the solar panel S is supplying power, the control device 2 controls the solar charging switch 5 to be turned on, so that the power from the solar panel S flows to the power storage device 4 through the solar charging switch 5 to charge the power storage device 4.

When the mains power P is supplied, the control device 2 controls the mains power charging switch 9 to be turned on, so that the mains power P charges the power storage device 4 via the AC/DC converter 7 and the mains power charging switch 9 .

When the solar panel S does not generate electricity and the mains P is out of power, the control device 2 controls the power storage device 4 to supply power to the mains P via the DC-AC converter 8, and the stored electricity can be supplied back to the mains. In this way, the AC and DC power conversion device 100 of the present invention can avoid or reduce the impact caused by power outages.

In this embodiment, when the solar panel S is powered and the mains P is powered, the solar charging switch 5 is turned on and the mains charging switch 9 is turned off. When the solar panel S is not powered and the mains P is powered, the solar charging switch 5 is turned off and the mains charging switch 9 is turned on. In other embodiments, when the solar panel S is powered and the mains P is powered, both the solar charging switch 5 and the mains charging switch 9 may be turned on to increase the charging speed.

As shown in FIG. 1 , in an AC and DC power conversion device 100 according to an embodiment of the present invention, a charge and discharge protection module 10 is connected to a power storage device 4 and a control device 2 so as to be controlled by the control device 2 to prevent the power storage device 4 from being overcharged or over-discharged.

The above description and explanation are only the description of the preferred embodiment of the present invention. Those with ordinary knowledge in this technology can make other modifications according to the scope of the patent application defined below and the above description. However, these modifications should still be within the spirit of the present invention and within the scope of the rights of the present invention.

100: AC and DC power conversion equipment 1: Solar panel connector 2: Control device 3: Voltage sensor 4: Power storage device 5: Solar charging switch 6: Mains connector 7: AC-DC converter 8: DC-AC converter 9: Mains charging switch 10: Charging and discharging protection module E: Electric transportation vehicle P: Mains S: Solar panel

[Figure 1] is a block diagram showing an AC and DC power conversion device according to an embodiment of the present invention.

100: AC and DC power conversion equipment

1: Solar board connector

2: Control device

3: Voltage sensor

4: Power storage device

5: Solar charging switch

6: Mains power connector

7: AC to DC converter

8: DC to AC converter

9: Mains charging switch

10: Charging and discharging protection module

E: Electric transportation vehicles

P: Mains electricity

S: Solar panels

Claims (5)

An AC and DC power conversion device comprises: a solar panel end connector for connecting to a solar panel; a control device; a voltage sensor connected to the solar panel end connector and the control device to sense whether the solar panel is supplying power; a power storage device; a solar charging switch connected between the solar panel end connector and the power storage device, and connected to the control device and controlled by the control device; a mains end connector for connecting to the mains; an AC-DC converter connected to the mains end connector; a DC-AC converter connected between the mains end connector and the power storage device; and A mains charging switch is connected between the AC-DC converter and the power storage device, and is connected to the control device and controlled by the control device. When the voltage sensor senses that the solar panel is supplying power, the control device controls the solar charging switch to be turned on so that the power from the solar panel flows to the power storage device through the solar charging switch to charge the power storage device. When the mains is supplying power, the control device controls the mains charging switch to be turned on so that the mains charges the power storage device through the AC-DC converter. When the solar panel is not generating power and the mains is out of power, the control device controls the power storage device to supply power to the mains through the DC-AC converter. As in claim 1, the AC and DC power conversion device, wherein the power storage device is a battery of a charging station, connected to an electric vehicle to supply power to the electric vehicle. As in claim 1, the AC and DC power conversion device, wherein the power storage device is a battery of an electric vehicle. The AC and DC power conversion device of claim 1 further includes a charge and discharge protection module connected to the power storage device and the control device. As in claim 1, the AC and DC power conversion device, wherein at most one of the solar charging switch and the AC charging switch is turned on.

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