CN203632330U

CN203632330U - Separate-type wireless charger

Info

Publication number: CN203632330U
Application number: CN201320782018.2U
Authority: CN
Inventors: 宋艳; 贾宇向; 李润娟
Original assignee: 宋艳; 贾宇向; 李润娟
Priority date: 2013-12-04
Filing date: 2013-12-04
Publication date: 2014-06-04
Anticipated expiration: 2023-12-04

Abstract

The utility model discloses a separate-type wireless charger, and the charger comprises a transmitter and a receiver. The transmitter comprises a rectifier circuit, a first DC-DC circuit, a first controller, and a half-bridge grid drive chip, wherein the rectifier circuit, the first DC-DC circuit, the first controller and the half-bridge grid drive chip are sequentially connected together. The first output port of the half-bridge grid drive chip and the second output port of the half-bridge grid drive chip are respectively connected with the base electrode of a transistor Q11 and the grid electrode of a transistor Q12. The drain electrode of the transistor Q11 is connected with the source electrode of the transistor Q12, and is connected with a transmitting coil L1 through a resonant capacitor C3. The receiver comprises a receiving coil L2, a capacitor C5, a capacitor C6, a full-bridge rectifier circuit, and a second DC-DC circuit, wherein the capacitor C5 and the capacitor C6 form a series resonant circuit along with the receiving coil L2. According to the utility model, the transmitter and the receiver respectively employ a controller, which is achieved through a single-chip microcomputer, for intelligent control and communication, so as to be compatible with a Q1 wireless power standard. The charger is simple in circuit structure and is higher in energy efficiency.

Description

Discrete wireless charger

Technical field

The utility model relates to a kind of charger, especially relates to a kind of discrete wireless charger.

Background technology

Popular along with portable type electronic product (such as smart mobile phone, panel computer etc.), portable type electronic product uses portable power source management (on-the-go), and the use of wireless (contactless) charging technique becomes more to come approximately to be popularized.Although it is high that the efficiency of wireless charging technology can not show a candle to limited charging technique, wireless charging is provided convenience for user has save charge cable.

Wireless charging alliance (WPC) has set up a short-distance movement equipment wireless power transmission standard that is called " Qi ", communication protocol in WPC standard definition low power wireless device between inductance coupling high method of work and power transmitter and receiver, the maximum power that has also defined the transmission from reflector to receiver is 5W, typical range between emitter coil and receiver coil is 5mm, and all can be used in conjunction with any other equipment that meets WPC standard according to any equipment of WPC standard operation.

But existing wireless charger is most and do not meet the Qi operating such that the WPC of wireless charging alliance sets up, and the power loss of wireless charging is large, efficiency is lower, is unfavorable for energy savings.

Utility model content

Technical problem to be solved in the utility model is, propose a kind of wireless charging efficiency higher and with the discrete wireless charger of Qi operating such.

The utility model adopts following technical scheme to realize: a kind of discrete wireless charger, comprise reflector and receiver, described reflector comprises connected successively rectification circuit, a DC-DC circuit, the first controller and half-bridge gate drive chip, the first output port of described half-bridge gate drive chip and the second output port are connected with the base stage of transistor Q11 and the grid of transistor Q12 respectively, the source electrode of the drain electrode of described transistor Q11 and described transistor Q12, the drain electrode of transistor Q11 connects transmitting coil L1 by resonant capacitance C3; Described receiver comprises with described transmitting coil L1 and forms the receiving coil L2 of air-core transformer, capacitor C 5 and capacitor C 6, the full bridge rectifier that is connected successively described series resonant circuit and the 2nd DC-DC circuit with described receiving coil L2 formation series resonant circuit, two ends at described receiving coil L2 are connected respectively the source electrode of transistor Q31 and the source electrode of transistor Q32 with capacitor C 8 by capacitor C 7, the grid of the grid of described transistor Q31 and described transistor Q32 is all connected second controller.

Wherein, be connected with the common port of described transmitting coil L1 at described resonant capacitance C3 with one end of the capacitor C 4 for sampling electric current on transmitting coil L1, the other end of described capacitor C 4 connects a sample port of the first controller.

Wherein, the IN port of described half-bridge gate drive chip and the PWM port of described the first controller are connected.

Compared with prior art, the utlity model has following beneficial effect:

The discrete wireless charger the utility model proposes carries out Based Intelligent Control and communicates by letter with all adopting the controller with chip microcontroller in receiver at reflector, thus with compatible Qi wireless power standard, and have advantages of that circuit structure is simple, efficiency is higher.

Accompanying drawing explanation

Fig. 1 is the structural representation of wireless charger;

Fig. 2 is the circuit diagram of reflector in Fig. 1;

Fig. 3 is the circuit diagram of receiver in Fig. 2.

Embodiment

As shown in Figure 1, the discrete wireless charger the utility model proposes, the same with traditional wireless charger, be also to comprise the reflector being connected with external power source (such as AC220V), the receiver being connected in electromagnetic coupled mode with reflector.

As shown in Figure 2, reflector comprises: the rectification circuit being connected with external power source; Be connected to a DC-DC circuit of rectification circuit output end, by a DC-DC circuit by the direct voltage of rectification circuit output convert to respectively 5V direct voltage to the first controller and transistor Q11 power supply, convert 15V direct voltage to and power to half-bridge gate drive chip U1; By the first controller of chip microcontroller; The half-bridge gate drive chip U1 that adopts model FAN73932, the IN port of this half-bridge gate drive chip U1 is connected with the PWM port of the first controller; The first output port HO of this half-bridge gate drive chip U1 and the second output port LO connect respectively the grid of transistor Q11 and the grid of transistor Q12; The source electrode of transistor Q11 connects the output of a DC-DC circuit, and the drain electrode of transistor Q11 connects the source electrode of transistor Q12, and the grounded drain of transistor Q12; The drain electrode of transistor Q11 connects transmitting coil L1 by resonant capacitance C3; Be connected one with the common port of transmitting coil L1 at resonant capacitance C3 for sampling the capacitor C 4 of electric current on transmitting coil L1, this capacitor C 4 connects a sample port of the first controller.

The PWM port output pwm signal of the first controller is to the IN port of half-bridge gate drive chip U1, half-bridge gate drive chip U1 converts the pwm signal of reception to the non-overlapped signal of two-way driving transistors Q11 and transistor Q12 respectively, realized the conversion of direct current and alternating current by the alternate conduction of two transistor Q11 and transistor Q12 and cut-off, the alternating current being converted to carries out power emission by the series resonant circuit being made up of resonant capacitance C3 and transmitting coil L1.And, capacitor C 4 samples the upper electric current of transmitting coil L1, feed back to a sample port of the first controller by the form of output voltage, the A/D change-over circuit being carried by the sample port of the first controller obtains information of voltage, and then detect the variation of the upper electric current of transmitting coil L1, judge the operating state of transmitting coil L1 with this.

Receiver can arrange separately or integrated being arranged among portable electric appts.Shown in Fig. 3, receiver comprises: with the take-up circle L2 of described transmitting coil L1 formation air-core transformer, with capacitor C 5 and the C6 of receiving coil L2 formation series resonant circuit; By the second controller of chip microcontroller; By transistor Q31 and the transistor Q32 of second controller control, the base stage of transistor Q31 and the base stage of transistor Q32 are all connected the control end of second controller, the drain electrode of transistor Q31, the equal ground connection of drain electrode of transistor Q32, the source electrode of the source electrode of transistor Q31 and transistor Q32 is connected to respectively the two ends of receiving coil L2 by capacitor C 7 and capacitor C 8; And the two ends of receiving coil L2 couple full bridge rectifier, this full bridge rectifier is made up of 2 transistor Q21 and transistor Q22 and 2 diode D21 and diode D22, and the output of full bridge rectifier is by the 5V direct voltage of the 2nd DC-DC circuit stable output, utilize this 5V direct voltage to charge for storage battery.

When second controller powers on, the work of two transistor Q31 of control signal control and transistor Q32 of sending is to communicate with reflector.In the time that the receiving coil of receiver is placed on the transmitting coil of reflector, series resonant circuit in receiver obtains alternating voltage, alternating voltage becomes direct voltage after full bridge rectifier carries out rectification, and this direct voltage is again through the 5V direct voltage of the 2nd DC-DC circuit stable output.

Wherein, diode D21 and diode D22 all adopt Schottky diode.Facts have proved, in receiver, full bridge rectifier adopts 2 mosfet transistor Q21 to arrange in pairs or groups mutually with Q22 and 2 Schottky diode D21 and D22, the power loss of full bridge rectifier reduces greatly, thereby can make the energy consumption of full bridge rectifier get a promotion, and improves the efficiency of receiver.

Through experiment showed, discrete wireless charger of the present utility model, 5V direct voltage that can stable output, efficiency is 65%～75%.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.

Claims

1. a discrete wireless charger, comprises reflector and receiver, it is characterized in that:

Described reflector comprises connected successively rectification circuit, a DC-DC circuit, the first controller and half-bridge gate drive chip, the first output port of described half-bridge gate drive chip and the second output port are connected with the base stage of transistor Q11 and the grid of transistor Q12 respectively, the source electrode of the drain electrode of described transistor Q11 and described transistor Q12, the drain electrode of transistor Q11 connects transmitting coil L1 by resonant capacitance C3;

Described receiver comprises with described transmitting coil L1 and forms the receiving coil L2 of air-core transformer, capacitor C 5 and capacitor C 6, the full bridge rectifier that is connected successively described series resonant circuit and the 2nd DC-DC circuit with described receiving coil L2 formation series resonant circuit, two ends at described receiving coil L2 are connected respectively the source electrode of transistor Q31 and the source electrode of transistor Q32 with capacitor C 8 by capacitor C 7, the grid of the grid of described transistor Q31 and described transistor Q32 is all connected second controller.

2. discrete wireless charger according to claim 1, it is characterized in that: be connected with one end of the capacitor C 4 for sampling electric current on transmitting coil L1 with the common port of described transmitting coil L1 at described resonant capacitance C3, the other end of described capacitor C 4 connects a sample port of the first controller.

3. discrete wireless charger according to claim 1, is characterized in that: the IN port of described half-bridge gate drive chip is connected with the PWM port of described the first controller.