TWI501886B - Charging system for electric vehicle - Google Patents

Description

Charging system for electric vehicles

The present invention relates to a charging system for an electric vehicle. In particular, there is an electric vehicle charging system that allows the electric vehicle motor to stop operating when the battery module is being charged.

An electric vehicle, also referred to as an electric drive vehicle, refers to a mobile vehicle that uses one or more electric motors as a power system. Instead of oil-powered vehicles, these vehicles operate by burning the energy produced by oil, which uses electricity as its power. They do not produce exhaust gas and have less noise. The motor is a common device for driving electric vehicles. Due to prolonged use, the motor requires a large amount of battery capacity for its battery source. Preferably, the battery module is rechargeable.

According to the relevant provisions of the Taiwan Electric Motor Vehicle Association and the Taiwan Electronic Testing Center, the research results of the Vehicle Research and Testing Center and the Industrial Technology Research Institute, when the charger charges the charging electric vehicle battery module, the running motor should Cut off its power supply. For safety reasons, the power-off circuit should be designed to prevent the motor from accelerating (burst). However, a general charging device does not have such a power management device. The power output only has positive and negative terminals, and the design concept is only in the charging function. At best, at most, only the communication interface is installed. Such a structure cannot meet the above requirements.

Backtracking techniques, there are many inventions that provide an innovative approach to meeting these needs. Please refer to Figure 1. U.S. Patent No. 8,143,843 discloses an electric hybrid vehicle having a charging circuit having a charger. The charger is connected to a high voltage battery and a charge-time connection switch. The switch is connected to a high voltage battery, a charger, a charger electronic control unit and a battery electronic control unit. When a voltage signal is input, the battery electronic control unit is activated. When it is determined whether the state of the high-voltage battery can satisfy the chargeable condition, the charger is connected to the charge-time connection switch, activates the charger electronic control unit and transmits a signal indicating the state of the battery to the charger electronic control unit. The present invention provides a good way to monitor and fine tune the state of charge of the battery electronic control unit. However, when the charger electronic control unit is in operation, the present invention cannot decide to stop supplying power to the motor.

Another related front case is shown in Figure 2. The Republic of China Patent No. I365,142 discloses a power control system for an electric vehicle, comprising a control terminal, a DC conversion module, a battery and a motor, wherein the control terminal can be activated to generate a power down signal. The DC conversion module is provided with a DC converter and a relay electrically connected to the battery to convert the high voltage power supplied by the battery into at least one low voltage power supply, such as: 3 volts, 5 volts, 12 volts, etc., for the electrical components of the electric vehicle (such as: headlights, brake lights, headlights, speakers, etc.), or electronic components (such as: relays, control terminals, etc.). The relay is electrically connected to the control terminal, the DC converter, the battery and the motor, respectively, to receive the low-voltage power from the DC converter, so that the self-loop can perform the electrical conduction or electrical interruption switching operation. When electrically connected in its own loop In the state, the high voltage power supply supplied by the battery can be transmitted to the motor through the circuit of the relay to cause the motor to operate. In the state that the relay receives the power-off signal from the control terminal, the relay can switch its own circuit into an electrical interruption state, so that the high-voltage power supply supplied by the battery cannot be transmitted to the circuit through the relay. The motor stops the motor.

Since the relay of the present invention and the DC converter are electrically connected to each other, the relay can receive a lower voltage source from the DC converter without receiving an excessive voltage source. The benefits of this invention are lower heat generation and energy savings, but unfortunately it does not control the power supply to the motor while the battery is charging.

According to the above explanation, a charging system for an electric vehicle, which allows the motor of the electric vehicle to stop operating when the battery module is charged, and to reduce the occurrence of the motor overshoot situation, is in need of consideration.

This paragraph of text extracts and compiles some of the features of the present invention; other features will be described in subsequent paragraphs. Its purpose is to cover the spirit and scope of the subsequent patent scope, different retouching and similar arrangements.

According to one aspect of the present invention, a charging system for an electric vehicle includes: a rechargeable battery module having a plurality of rechargeable batteries connected in series or in parallel for providing power and storing power from an external power source; An initiator connected to the rechargeable battery module by a control signal; Controlling power output from the rechargeable battery module; a power switch connected to the rechargeable battery module and an external power source, and when the potential of the external power source is higher than the potential of the rechargeable battery module, the rechargeable battery module is externally connected Conducting power between the power sources, and when the potential of the external power source is lower than the potential of the rechargeable battery module, for blocking power conduction between the rechargeable battery module and the external power source; and a control circuit, and the external power source and the motor starter Connecting, when a current is from the external power source, for generating the control signal to the motor starter; wherein when the control signal is received, the motor starter stops power output from the rechargeable battery, and when the control signal does not exist The motor starter continues to output power from the rechargeable battery.

According to the present concept, the motor starter is connected to a motor or light source.

According to the present invention, the external power source is an AC/DC converter, a charge controller, a DC battery, a DC power source, or a power factor adjustment power supply.

According to the concept of the present case, the power switch is passive or active.

According to the concept of the present invention, the passive power switch is a diode.

According to the present invention, the active power switch is a metal oxide semiconductor field effect transistor.

According to the concept of the present case, the control signal is a current.

The present invention will be more clearly described by reference to the following examples by the following examples. Please refer to Figures 3 to 6. Figure 3 depicts the hair An embodiment of the invention. Figure 4 depicts a switch of this embodiment in an open state. Figure 5 depicts a passive switch and associated circuitry of this embodiment. Figure 6 depicts an active switch and associated circuitry of this embodiment.

Please see Figure 3 first. A charging system 100 for an electric vehicle is illustrated in the dashed box. The charging system 100 is composed of a rechargeable battery module 101, a motor starter 102, a power switch 103 and a control circuit 104. The rechargeable battery module 100 has a plurality of rechargeable batteries connected in series for supplying power and storing power from an external power source 200. In this embodiment, the external power source 200 is an AC/DC converter that converts AC power from the power system into a working low voltage DC power. Of course, the installation of the rechargeable battery in the rechargeable battery module 100 is not limited to the series connection. A method of mixing in parallel or in parallel and in series can also be used.

The motor starter 102 is connected to the rechargeable battery module 101. It controls the power output from the rechargeable battery module 101 by a control signal. The present invention is used to stop the motor operation while the charging operation is in progress. Therefore, the motor starter 102 is further coupled to a motor 105. In practice, this can also be used in other equipment or instruments that need to be stopped when the electric vehicle is charging. A good example is the light source.

The power switch 103 is connected to the rechargeable battery module 101 and the external power source 200. If the potential of the external power source 200 is higher than the potential of the rechargeable battery module 101, the power switch 103 can turn on the power between the rechargeable battery module 101 and the external power source 200. When the potential of the external power source 200 is lower than the potential of the rechargeable battery module 101, the power switch 103 can also block the electrical communication between the rechargeable battery module 101 and the external power source 200.

The control circuit 104 is connected to the external power source 200 and the motor starter 102. When the external power source 200 sends a current, the control circuit 104 is used to generate the control signal to the motor starter 102. When receiving the control signal, the motor starter 102 stops outputting power from the rechargeable battery 101; when the control signal is not present, the motor starter 102 continues to output power from the rechargeable battery 101.

In order to better understand the operation mode of the present invention, please refer to FIG. 3 and FIG. 4 at the same time. Fig. 3 shows the power switch 103 in a short circuit condition, and Fig. 4 shows the power switch 103 in an open circuit situation. It is easy to understand that when the power switch 103 is short-circuited, power from the external power source 200 can be transmitted to the rechargeable battery 101 via the route C1 for charging as long as the potential of the external power source 200 is higher than the potential of the rechargeable battery module 101. However, it can also provide power to operate the motor 105 via control circuit 104 via route A. At the same time, the rechargeable battery 101 can also provide power to the control circuit 104 (not directly to the motor 105) via route D1. At this time, the motor 105 does not stop operating.

However, the external power supply 200 also generates a current that is transmitted to the control circuit 104 via the route B by the potential difference. In accordance with the above description, the control circuit 104 generates the control signal to the motor starter 102 to stop outputting power from the rechargeable battery 101. Obviously, the control signal is another current. As a result, when the external power source 200 charges the rechargeable battery 101, the motor 105 stops operating. If the potential of the external power source 200 is lower than the potential of the rechargeable battery module 101, the power switch 103 will stop the current from the external power source 200. However, because a current is transmitted to the control power via route B In the path 104, the control circuit 104 will still generate the control signal to the motor starter 102 to stop outputting power from the rechargeable battery 101. The motor 105 will stop functioning.

Please refer to Figure 4. When the external power source 200 is not connected to the charging system 100 or does not provide power, the rechargeable battery 101 continues to transmit power via the routes C2 and D2. As such, the rechargeable battery 101 can provide power to the motor 105 without the obstruction of the motor actuator 102.

It should be emphasized that the external power supply 200 is not limited to an AC/DC converter. In practice it can be a charge controller, a DC battery, a DC power supply or a power factor adjustment power supply. The power switch 103 has two forms, passive or active. In order to have a better understanding of this, please refer to Figures 5 and 6. Figure 5 shows that the circuit design uses two diodes as the power switch 103 (enclosed by a dashed circle). This is passive. Refers to the power from the external power source 200. The control signal is ultimately sent via an output source within a dashed box. Similarly, Figure 6 shows that the circuit design uses a metal oxide semiconductor field effect transistor as the power switch 103 (enclosed by a dashed circle). This is proactive. VIN refers to power from an external power source 200. The control signal is ultimately sent via an output source within a dashed box.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Charging system

101‧‧‧Rechargeable battery module

102‧‧‧Motor starter

103‧‧‧Power switch

104‧‧‧Control circuit

105‧‧‧Motor

200‧‧‧External power supply

Figure 1 shows a conventional charging system.

Figure 2 shows another conventional charging system.

Figure 3 depicts an embodiment of the invention.

Figure 4 depicts a switch of this embodiment in an open state.

Figure 5 depicts a passive switch and associated circuitry of this embodiment.

Figure 6 depicts an active switch and associated circuitry of this embodiment.

100‧‧‧Charging system

101‧‧‧Rechargeable battery module

102‧‧‧Motor starter

103‧‧‧Power switch

104‧‧‧Control circuit

105‧‧‧Motor

200‧‧‧External power supply

Claims (7)

A charging system for an electric vehicle, comprising: a rechargeable battery module, having a plurality of rechargeable batteries connected in series or in parallel for providing power and storing power from an external power source; and a power switch connected to the rechargeable battery module The group and the external power source are used to conduct power between the rechargeable battery module and the external power source when the potential of the external power source is higher than the potential of the rechargeable battery module, and when the potential of the external power source is lower than the potential of the rechargeable battery module For blocking power conduction between the rechargeable battery module and the external power source; a control circuit is connected to the external power source for blocking power conduction between the rechargeable battery module and the external power source, and receiving the a control signal is generated when the external power source is powered; and a motor starter is connected to the rechargeable battery module, the control circuit and a motor. When the motor starter receives the control signal from the control circuit, The motor starter stops outputting power from the rechargeable battery module to the motor, and when the motor starter does not receive the control circuit When the control signal, the motor starter continuously to the motor output power from the rechargeable battery pack. The charging system of claim 1, wherein the motor actuator is coupled to a motor or a light source. The charging system of claim 1, wherein the external power source It is an AC/DC converter, a charge controller, a DC battery, a DC power supply or a power factor adjustment power supply. The charging system of claim 1, wherein the power switch is passive or active. The charging system of claim 4, wherein the passive power switch is a diode. The charging system of claim 4, wherein the active power switch is a metal oxide semiconductor field effect transistor. The charging system of claim 1, wherein the control signal is a current.