Electronic device and bottom type self-driven bridgeless rectifier

The subject matter herein generally relates to an electronic device and a bottom type self-driven bridgeless rectifier with efficiency for wireless charging.

Wireless charging uses an electromagnetic field to transfer power between two objects. This is usually done with a charging station. Power is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.

Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.

FIG. 1 is a block diagram of an electronic device in one embodiment.

FIG. 2 is a circuit diagram view of a rectifier of the electronic device of FIG. 1 .

FIG. 3 is a wave diagram of an AC power coupled to the rectifier of FIG. 2 .

FIG. 4 is a circuit diagram of the rectifier working in a first mode.

FIG. 5 is a circuit diagram of the rectifier working in a second mode.

FIG. 6 is a circuit diagram of the rectifier working in a fourth mode.

FIG. 7 is a circuit diagram of the rectifier working in a fifth mode.

It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein may be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.

Several definitions that apply throughout this disclosure will now be presented.

The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like.

FIG. 1 illustrates a block diagram of an electronic device in one embodiment. The electronic device 100 includes a wireless charging transmitter 10 and a wireless charging receiver 30 . The wireless charging transmitter 10 includes a first transmitter adapter 11 , a second transmitter adapter 12 , a transmitter matching circuit 13 , and a transmitter antenna 14 . The wireless charging receiver 30 includes a receiver adapter 31 , a rectifier 32 , a receiver matching circuit 33 , and a receiver antenna 34 . The electronic device 100 can be a laptop computer, a tablet computer, a smart phone, or a wearable device.

The wireless charging transmitter 10 can transmit power to the wireless charging receiver 30 through the transmitter antenna 13 and the receiver antenna 34 . The wireless charging receiver 30 can supply the receiving power to a battery or device system. The first transmitter adapter 11 can convert a low frequency alternating current (AC) to a first direct current (DC). The second transmitter adapter 12 can convert the first DC to a high frequency AC. The transmitter matching circuit 13 can transmit the high frequency AC to the transmitter antenna 14 . The transmitter matching circuit 33 can transmit the received high frequency AC from the receiver antenna 34 to the rectifier 32 . The rectifier 32 can convert the received high frequency AC to a second DC. The receiver adapter 31 can convert the second DC to a third DC.

FIG. 2 illustrates a circuit diagram of a rectifier in one embodiment. The rectifier can convert a high frequency AC power 50 to a DC. The rectifier includes a first diode D 1 , a second diode D 2 , a first switch M 1 and a second switch M 2 . The first switch M 1 and the second switch M 2 can be two same metal oxide semiconductor field effect transistors (MOSFETS). The first switch M 1 can include a first parasitic diode D 3 (as shown in FIG. 6 ). The second switch M 2 can include a second parasitic diode D 4 (as shown in FIG. 4 ). A positive pole of the first diode D 1 , a drain D of the first switch M 1 , and a gate G of the second switch M 2 are coupled to a first output pole of the high frequency AC power 50 . A positive pole of the second diode D 2 , a drain D of the second switch M 2 , and a gate G of the first switch M 1 are coupled to a second output pole of the high frequency AC power 50 . A negative pole of the first diode D 1 and a negative pole of the second diode D 2 are coupled to an output resistor RO for supplying a load 35 . A source S of the first switch M 1 , a source S of the second switch M 2 and the output resistor R 0 is grounded. A capacitor C 0 is coupled to the negative pole of the first diode M 1 and the negative pole of the second pole M 2 on one side and is grounded on another side.

FIG. 3 illustrates a wave diagram of an AC power. When the AC power runs in one cycle, the rectifier can work from a mode 1 to a mode 6 . When the high frequency AC outputs a positive voltage from a first pole, the rectifier can work from mode 1 to mode 3 . When the AC power outputs a positive voltage from a second pole, the rectifier can work from mode 4 to mode 6 . A threshold voltage of the gate of the first switch M 1 or the second switch M 2 is defined when the first switch M 1 or the second switch M 2 can be changed from a switched off state to a switch on state.

FIG. 4 illustrates a circuit diagram of the rectifier working in mode 1 . In mode 1 , an output voltage from the first pole of the AC power 50 is lower than the threshold voltage. The first diode D 1 is on. The second diode D 2 , the first switch M 1 and the second switch M 2 are switched off. However, the parasitic diode D 4 of the second switch M 2 is switched on. The second pole of the AC power is grounded. The resistor R 0 can receive an output DC power.

FIG. 5 illustrates a circuit diagram of the rectifier working in mode 2 . In mode 2 , an output voltage from the first pole of the AC power 50 is equal to or higher than the threshold voltage. The first diode D 1 and the second switch M 2 are switched on. The second diode D 2 and the first switch M 1 are switched off. The second pole of the AC power is grounded. The resistor R 0 can receive an output DC power.

In mode 3 , the output voltage from the first pole of the AC power 50 becomes lower than the threshold voltage. A circuit diagram of the rectifier is the same as mode 1 .

FIG. 6 illustrates a circuit diagram of the rectifier working in mode 4 . In mode 4 , an output voltage from the second pole of the AC power 50 is lower than the threshold voltage. The second diode D 2 is on. The first diode D 1 , the first switch M 1 and the second switch M 2 are switched off. However, the parasitic diode D 3 of the first switch M 1 is switched on. The second pole of the AC power is grounded. The resistor R 0 can receive an output DC power.

FIG. 7 illustrates a circuit diagram of the rectifier working in mode 5 . In mode 5 , an output voltage from the second pole of the AC power 50 is equal to or higher than the threshold voltage. The second diode D 2 and the first switch M 1 are switched on. The first diode D 1 and the second switch M 2 are switched off. The first pole of the AC power is grounded. The resistor RO can receive an output DC power.

In mode 6 , the output voltage from the second pole of the AC power 50 becomes lower than the threshold voltage. A circuit diagram of the rectifier is the same as mode 4 .

The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a fan detecting device and an electronic device and a bottom type self-driven bridgeless rectifier. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the details, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including, the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.