TWI671987B - Wireless power transmitting unit - Google Patents

Abstract

A wireless power transmission unit includes: a transmitting coil for transmitting energy to a receiving coil of a wireless power receiving unit; an impedance matching network electrically connected to the transmitting coil; a power amplifier electrically connected to the transmitting coil; An impedance matching network is used to provide an output voltage to the transmitting coil through the impedance matching network; an optical relay is electrically connected to the impedance matching network, and the impedance matching network and the optical relay are used to adjust the transmission The impedance matching of the coil; and a microcontroller, which is electrically connected to the photorelay and is used for controlling the photorelay to adjust the impedance matching of the transmitting coil.

Description

Wireless power transmission unit

The present disclosure relates to the field of wireless charging, and more particularly to a wireless power transmission unit.

Wireless charging is also called non-contact inductive charging. It uses coil induction to transfer energy from a Power Transmission Unit (PTU) to a Power Receiving Unit (PRU). The power receiving unit is installed in the electronics In the device (device to be charged), the power receiving unit charges the battery inside the electronic device after receiving the energy. Because the power transmission unit and the power receiving unit transmit energy in a coil induction manner, there is no need to connect a line between them, so wireless charging is more convenient than wired charging.

Impedance matching is one of the factors that determines whether wireless charging efficiency is good. In the power transmission unit, an impedance matching network (IMN) is provided between the power amplifier (PA) and the transmitting coil. The impedance matching network is used for impedance matching between the power amplifier and the transmitting coil. This improves charging efficiency. In addition, the power transmission unit further includes a bidirectional metal oxide semiconductor field effect transistor (MOSFET) or a transformer electrically connected to the impedance matching network, and a bidirectional metal oxide of the impedance matching network. Semiconductor field effect transistors or transformers can fine-tune impedance matching to further improve charging efficiency.

However, the circuit of the bidirectional metal oxide semiconductor field effect transistor or transformer is complicated and easy to burn out. Furthermore, the noise flowing through the bidirectional metal-oxide-semiconductor field-effect transistor or the transformer or the generated noise easily flows into other components, which may cause damage to other components.

Therefore, it is necessary to propose a solution to the problems of the conventional technology.

The present disclosure provides a wireless power transmission unit capable of solving the problems in the conventional technology.

The wireless power transmission unit of the present disclosure includes: a transmitting coil for transmitting energy to a receiving coil of a wireless power receiving unit; an impedance matching network electrically connected to the transmitting coil; a power amplifier electrically connected To the impedance matching network and used to provide an output voltage to the transmitting coil through the impedance matching network; a photorelay electrically connected to the impedance matching network, the impedance matching network and the photorelay being used for adjustment Impedance matching of the transmitting coil; and a microcontroller electrically connected to the photorelay and used to control the photorelay to adjust impedance matching of the transmitting coil.

In an embodiment, the wireless power transmission unit further includes a DC power supply unit. The DC power supply unit is electrically connected to the power amplifier and the microcontroller. The DC power supply unit is configured to output a DC voltage to the power amplifier.

In one embodiment, the microcontroller is used to control the magnitude of the DC voltage output by the DC power supply unit.

In an embodiment, the wireless power transmission unit further includes a pre-driving unit. The pre-driving unit is electrically connected to the power amplifier and configured to provide a pre-driving voltage to the power amplifier. The power amplifier receives the pre-driving voltage and The pre-driving voltage is amplified to generate the output voltage.

In an embodiment, the wireless power transmission unit further includes a low-power Bluetooth unit, and the low-power Bluetooth unit is electrically connected to the microcontroller and used to communicate with the wireless power receiving unit.

In an embodiment, the wireless power transmission unit further includes a sensor group, the sensor group is electrically connected to the power amplifier and the microcontroller and is used for sensing the output voltage and an output of the power amplifier. Current.

In one embodiment, the photorelay is further used to isolate the flow to the microcontroller Noise.

In the wireless power transmission unit of the present disclosure, the circuit structure of the photorelay is simpler than that of a conventional bidirectional metal oxide semiconductor field effect transistor or transformer. Moreover, the photorelay of the present disclosure can be directly controlled by the microcontroller. Finally, the photorelay of the present disclosure has a good isolation effect. Noise generated by the photorelay or the photorelay will not flow into the microcontroller.

1,1’‧‧‧Wireless power transmission unit

5‧‧‧Wireless power receiving unit

10‧‧‧Transmitting coil

12‧‧‧Impedance matching network

14‧‧‧ Power Amplifier

16‧‧‧Photorelay

18‧‧‧Microcontroller

20‧‧‧DC Power Supply Unit

22‧‧‧ Pre-Drive Unit

24‧‧‧ Low Power Bluetooth Unit

26‧‧‧Sensor Set

50‧‧‧Receiving coil

FIG. 1 shows a block diagram of a wireless power transmission unit according to an embodiment of the present disclosure.

FIG. 2 is a block diagram of a wireless power transmission unit according to another embodiment of the present disclosure.

Please refer to FIG. 1. FIG. 1 shows a block diagram of a wireless power transmission unit 1 according to an embodiment of the present disclosure.

The wireless power transmission unit 1 includes a transmitting coil 10, an impedance matching network 12, a power amplifier 14, an optical relay 16, and a micro controller unit (MCU) 18.

The transmitting coil 10 is used for transmitting energy to a receiving coil 50 of a wireless power receiving unit 5. More specifically, the transmitting coil 10 is used for transmitting energy to the receiving coil 50 of the wireless power receiving unit 5 in a magnetic resonance manner for wireless charging.

The impedance matching network 12 is electrically connected to the transmitting coil 10.

The power amplifier 14 is electrically connected to the impedance matching network 12 and is used to provide an output voltage to the transmitting coil 10 through the impedance matching network 12.

One feature of this disclosure is that the photorelay 16 is provided, and the photorelay 16 is electrically connected to the impedance matching network 12. The impedance matching network 12 and the photorelay 16 are used to adjust the impedance matching of the transmitting coil 10. More specifically, the impedance matching network 12 can roughly adjust (coarse adjustment) the impedance matching of the transmitting coil 10, and the photorelay 16 can finely adjust (fine adjust) the transmission The impedance of the coil 10 is matched.

Compared with the conventional technology using a bidirectional metal oxide semiconductor field effect transistor or a transformer to fine-tune impedance matching, the photorelay 16 of the present disclosure has the following advantages.

First, the circuit structure of the photorelay 16 of the present disclosure is simpler than that of a conventional bidirectional metal oxide semiconductor field effect transistor or transformer. Furthermore, the photorelay 16 of the present disclosure can be directly controlled by the microcontroller 18, and it is known that the bidirectional metal oxide semiconductor field effect transistor or transformer cannot be directly controlled by the microcontroller 18. Finally, the photorelay 16 of the present disclosure has a good isolation effect. More specifically, the photorelay 16 is further used to isolate noise flowing to the microcontroller 18 so that the photorelay 16 or the photorelay flows The noise generated by 16 will not flow into the microcontroller 18, that is, it will not affect the microcontroller 18.

The microcontroller 18 is electrically connected to the photorelay 16 and is used to control the photorelay 16 to finely adjust the impedance matching of the transmitting coil 10.

The wireless power transmission unit 1 further includes a DC power supply unit 20. The DC power supply unit 20 is electrically connected to the power amplifier 14 and the microcontroller 18. The DC power supply unit 20 is configured to output a DC voltage to the power amplifier 14. . The microcontroller 18 can be used to control the magnitude of the DC voltage output by the DC power supply unit 20.

The wireless power transmission unit 1 further includes a pre-driving unit 22. The pre-driving unit 22 is electrically connected to the power amplifier 14 and is used to provide a pre-driving voltage to the power amplifier 14. The power amplifier 14 receives the pre-driving voltage and The pre-driving voltage is amplified to generate the output voltage.

The wireless power transmission unit 1 further includes a low-power Bluetooth unit (Bluetooth Low Energy, BLU) 24. The low-power Bluetooth unit 24 is electrically connected to the microcontroller 18 and configured to communicate with the wireless power receiving unit 5. .

Please refer to FIG. 2. FIG. 2 shows a block diagram of a wireless power transmission unit 1 'according to another embodiment of the present disclosure.

The wireless power transmission unit 1 'of this embodiment and the wireless power transmission sheet of FIG. 1 The difference between element 1 is that the wireless power transmission unit 1 ′ of this embodiment further includes a sensor group 26, which is electrically connected to the power amplifier 14, the DC power supply unit 20, and the microcontroller 18. It is also used to sense an output voltage and an output current of the power amplifier 14.

For other elements in this embodiment, please refer to the related description in FIG. 1, which will not be repeated here.

In the wireless power transmission unit of the present disclosure, the circuit structure of the photorelay is simpler than that of a conventional bidirectional metal oxide semiconductor field effect transistor or transformer. Moreover, the photorelay of the present disclosure can be directly controlled by the microcontroller. Finally, the photorelay of the present disclosure has a good isolation effect. Noise generated by the photorelay or the photorelay will not flow into the microcontroller.

Although the present disclosure has been disclosed as above with a preferred embodiment, it is not intended to limit the present disclosure. Those with ordinary knowledge in the technical field to which this disclosure belongs can make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the scope of the appended patent application.

Claims (7)

A wireless power transmission unit includes: a transmitting coil for transmitting energy to a receiving coil of a wireless power receiving unit; an impedance matching network electrically connected to the transmitting coil; a power amplifier electrically connected to The impedance matching network is used to provide an output voltage to the transmitting coil through the impedance matching network; a photo relay is electrically connected to the impedance matching network, and the impedance matching network and the photo relay are used for adjusting the Impedance matching of the transmitting coil; and a microcontroller electrically connected to the photorelay and used to control the photorelay to adjust the impedance matching of the transmitting coil. For example, the wireless power transmission unit of claim 1 further includes a DC power supply unit. The DC power supply unit is electrically connected to the power amplifier and the microcontroller. The DC power supply unit is configured to output a DC voltage to the power amplifier. The wireless power transmission unit according to claim 2, wherein the microcontroller is configured to control the magnitude of the DC voltage output by the DC power supply unit. The wireless power transmission unit according to claim 1, further comprising a pre-driving unit, the pre-driving unit is electrically connected to the power amplifier and used to provide a pre-driving voltage to the power amplifier, and the power amplifier receives the pre-driving voltage and amplifies The pre-driving voltage generates the output voltage. The wireless power transmission unit according to claim 1, further comprising a low-power Bluetooth unit, the low-power Bluetooth unit is electrically connected to the microcontroller and used to communicate with the wireless power receiving unit. For example, the wireless power transmission unit of claim 1, further comprising a sensor group, the sensor group is electrically connected to the power amplifier and the microcontroller and used for sensing the output voltage and an output current of the power amplifier. . The wireless power transmission unit of claim 1, wherein the photorelay is further used to isolate noise flowing to the microcontroller.