CN101197507A

CN101197507A - Wireless power device and circuit

Info

Publication number: CN101197507A
Application number: CNA200610164813XA
Authority: CN
Inventors: 周建锁
Original assignee: Beijing CEC Huada Electronic Design Co Ltd
Current assignee: Beijing CEC Huada Electronic Design Co Ltd
Priority date: 2006-12-06
Filing date: 2006-12-06
Publication date: 2008-06-11

Abstract

The invention provides a wireless power supply device and a circuit thereof. The working principle of the wireless power supply device is to obtain energy through electromagnetic induction in the electromagnetic field, and obtain dc power supply by processing energy; the wireless power supply device consists of two parts, a radio frequency source and an energy receiving and processing circuit; energy transmission is accomplished through electromagnetic coupling between the two parts; therefore, no conducting wire is needed, and the invention is beneficial to special application with inconvenience in connection through conducting wires. The invention provides circuit realization of the proposed wireless power supply device.

Description

Wireless power device and circuit

Technical field

The present invention is a wireless power device, and has provided the circuit realization.

Background technology

All electronic devices and components the time all need power supply in work, and need DC power supply during the work of wherein most electronic devices and components.In real world applications, the needed power supply of electronic devices and components work connects by lead realizes power transfer.In some concrete application, lead connects may be inconvenient.

The operation principle of wireless power device is, make aerial coil outwards launch electromagnetic field by radio-frequency signal source and resonant circuit, the receiving system antenna induction that is in the electromagnetic field is input to rectifier circuit after energy and the processing of process resonant circuit, through behind the rectifying and wave-filtering, can obtain direct voltage, but this voltage can change along with the difference of electromagnetic field intensity, therefore need carry out voltage stabilizing and handle, thus the stabilized voltage power supply of obtaining.Like this, radio-frequency signal source and energy are received and treatment circuit is called wireless power device together.

Aerial coil is in the electromagnetic field can sense voltage, and the voltage of sensing is carried out can obtaining DC power supply after the processing such as rectification, filtering, voltage stabilizing, can supply with electronic devices and components, thereby guarantees the electronic devices and components operate as normal.Like this, between power supply and the required DC power supply of electronic devices and components work, do not need lead to connect, can bring in some applications than convenience.

For example, utilize low frequency or high-frequency signal source, be connected to aerial coil, around coil, will produce magnetic field in the certain distance, the another one aerial coil is placed this magnetic field, will sense voltage, the voltage of sensing is handled to obtain DC power supply.Because different magnetic field intensitys, therefore the energy difference that aerial coil is sensed needs voltage stabilizing to handle, thereby forms a wireless power device, is used for power electronic equipment.

Summary of the invention

The present invention is that wireless power device and circuit are realized.The wireless power device 1 (as Fig. 1) of invention is made of two parts, and a part is a radio-frequency signal source 2, and a part is that energy receives and treatment circuit 3, and wherein, radio-frequency signal source 2 (as Fig. 2 and 3) is made of radio-frequency transmissions source 4 and transmitting antenna 5; Energy receives and treatment circuit 3 (as Fig. 2) is made of antenna 6 and radio source circuit 7, also can resolve into three modules (as Fig. 4), and promptly antenna and resonant circuit 11 (as Fig. 5), current rectifying and wave filtering circuit 12 (as Fig. 6) and voltage regulator circuit 13 constitute.Provided the circuit implementation of each module respectively, wherein the implementation of voltage regulator circuit 13 has provided three kinds, as Fig. 7～9.

Different with the power supply that needs lead to connect, wireless power device does not need lead to connect, and this can connect not convenient application to lead and bring benefit.

Description of drawings

Fig. 1 illustrates that wireless power device 1 is made of two parts, and promptly radio-frequency signal source 2 and energy receive and treatment circuit 3, and the empty arrow among the figure shows that energy is transferred to energy by radio-frequency signal source 2 by electromagnetic field and receives and treatment circuit 3 V _DDThe output voltage of expression wireless power device.

Fig. 2 shows transmitting antenna 5 and reception antenna 6 on the basis of Fig. 1, is used for explanation, in addition with remainder called after radio-frequency transmissions source 4 and radio source circuit 7.

Fig. 3 is the circuit diagram of radio-frequency signal source 2, comprises signal source 8, electric capacity 9, resistance 10 and transmitting antenna 5 at least.

Fig. 4 comprises antenna and resonant circuit 11, current rectifying and wave filtering circuit 12 and voltage regulator circuit 13 for the function sketch of energy reception and treatment circuit 3.

Fig. 5 is the formation of antenna and resonant circuit 11, comprises receiving antenna coil 6, resistance 14 and electric capacity 15.The two ends V of resonant capacitance 15 _AAnd V _BOutput to current rectifying and wave filtering circuit.

Fig. 6 is a current rectifying and wave filtering circuit 12, comprises rectifier bridge 16 and filter capacitor 17, output V _DDABe connected to voltage regulator circuit 13.

Fig. 7 is a kind of voltage regulator circuit implementation, promptly realizes with voltage-stabilizing device 18.

Fig. 8 is a kind of voltage regulator circuit implementation, promptly realizes with voltage stabilizing circuit, comprises divider resistance 19 and 20, reference voltage circuit 21, comparator 22 and scalable load 23.

Fig. 9 is a kind of voltage regulator circuit implementation, promptly realize with voltage isolation circuit and voltage stabilizing circuit,

divider resistance

24 and 25, reference voltage circuit 26, comparator 27 and power device 28 constitute voltage isolation circuit, and

divider resistance

29 and 30, comparator 31, scalable load 32 and filter capacitor 33 constitute voltage stabilizing circuit.

Embodiment

The specific embodiment of the present invention is described as follows:

1. Fa Ming wireless power device (as Fig. 1) can be realized with discrete component, and radio source circuit 7 (as Fig. 2) also can be realized with integrated circuit;

2. constitute two parts (as Fig. 1) of wireless power device, promptly radio-frequency signal source 2 and energy receive and treatment circuit 3, are indivisible integral body when work, but can make separately, produce or sell;

3. the frequency of radio-frequency signal source 2 (as Fig. 1) is generally low frequency or high frequency, must satisfy local radio frequency control requirement when forming product, such as being 125～135KHz, 13.56MHz, 27MHz etc.;

4. the power of wireless power device 1 depends on the size of electromagnetic field intensity, for low frequency or high-frequency signal, depends on the size of magnetic field intensity usually; Usually, the power output of wireless power device may also may be hanged down to tens microwatts up to the hundreds of milliwatt, and this depends on concrete application;

5. radio-frequency signal source 2 and energy receive and treatment circuit 3 distance spatially, depend on concrete application on the one hand, the electromagnetic field energy size that depends on radio-frequency signal source 2 emissions on the other hand, usually can be several centimetres, also may be tens centimetres, if the wireless power device power output is little, also may reach several meters distance;

6. the implementation of voltage regulator circuit has multiplely, has provided 3 kinds of implementations here.First kind is to utilize voltage-stabilizing device 18 to realize, as Fig. 7; Second kind is to utilize voltage stabilizing circuit (comprising two divider resistances 19 and 20, reference voltage circuit 21, comparator 22 and scalable load 23 at least) to realize, as Fig. 8; The third is to be realized by voltage isolation circuit (comprising two

divider resistances

24 and 25, reference voltage circuit 26, comparator 27 and power device 28 at least) and voltage stabilizing circuit (comprising two

divider resistances

29 and 30, comparator 31, scalable load 32 and 33 at least), as Fig. 9;

Scalable load 23 in the accompanying drawing 8 and 9 or 32 usefulness NMOS represent, in fact can use the load of other form;

8. if radio source circuit 7 usefulness integrated circuits are realized, production technology can be BIPOLAR technology, CMOS technology or BICMOS technology so.

Claims

1. wireless power device and circuit is characterized in that it is received by radio-frequency signal source and energy and treatment circuit two parts constitute.

2. wireless power device according to claim 1 and circuit is characterized in that finishing power transfer by electromagnetic field between reception of radio-frequency signal source and energy and the treatment circuit, do not need lead to connect.

3. wireless power device according to claim 1 and 2 and circuit, it is characterized in that radio-frequency signal source comprises a signal source, an electric capacity, a resistance and an aerial coil at least, and be cascaded, the resonance frequency of electric capacity and inductance coil is consistent with the signal source signal frequency.

4. wireless power device according to claim 1 and 2 and circuit is characterized in that energy receives and treatment circuit is made of antenna and resonant circuit, current rectifying and wave filtering circuit and voltage regulator circuit.

5. antenna according to claim 4 and resonant circuit is characterized in that constituting resonant tank by an aerial coil and an electric capacity parallel connection at least, and resonance frequency is consistent with the radio-frequency signal source signal frequency.

6. current rectifying and wave filtering circuit according to claim 4 is characterized in that being made of a rectifier and a filter capacitor at least, and rectifier can be realized with rectifying device, also can realize with four diodes, also can realize with four transistors.

7. voltage regulator circuit according to claim 4 is characterized in that using a voltage-stabilizing device to realize.

8. voltage regulator circuit according to claim 4, it is characterized in that to use a voltage stabilizing circuit to realize, and voltage stabilizing circuit is made of with resistance, a reference voltage circuit, a comparator and a scalable load two dividing potential drops, and the scalable load can realize with transistor.

9. voltage regulator circuit according to claim 4, it is characterized in that to use a voltage isolation circuit and a voltage stabilizing circuit to realize, voltage isolation circuit is made of with resistance, a reference voltage circuit, a comparator and a power device two dividing potential drops at least, voltage stabilizing circuit is made of with resistance, a comparator, a scalable load and a filter capacitor two dividing potential drops at least, and the scalable load can realize with transistor.

10. according to the wireless power device and the circuit of claim 1 or 2, it is characterized in that it can realize with discrete component, also energy reception and treatment circuit (except the aerial coil) can be realized with integrated circuit, realize that the technology of integrated circuit can be BIPOLAR technology, CMOS technology, BICMOS technology.