Wireless power supply system with double constant voltage output function

Abstract

The invention discloses a wireless power supply system with a double-constant-voltage output function, which comprises a transmitting part and a receiving part, and is characterized in that the transmitting part consists of a direct-current power supply UD, inverters (Q1-Q4), a compensation capacitor C1 and a transmitting coil LP; the receiving part is composed of a receiving coil LS, compensation inductors L1 and L2, compensation capacitors (C2-C4), a rectifier 1 (D1-D4), a rectifier 2 (D5-D8), two filter capacitors CF1 and CF2 and two loads RL1 and RL2. The rectifier 1 and the load RL1 form a first-stage output port of the system, the rectifier 2 and the load RL2 form a second-stage output port of the system, and the two-stage output ports are mutually independent and can provide constant power supply voltage for different devices. In addition, the output voltages of the two stages of output ports can be flexibly adjusted by adjusting the compensating inductors L1 and L2, so that the system can meet the power supply requirements of more devices. And meanwhile, the inverter of the system can realize zero-phase-angle operation, so that the high efficiency of the system is ensured.

Description

Technical Field

[0001] The invention relates to a wireless power supply system with a dual constant voltage output function, belonging to the technical field of wireless power transmission. Background Art

[0002] The traditional wired power transmission method transmits power through the connection between wires. However, this power supply method has many inconveniences for some special applications and mobile devices, and also causes complicated wiring and risks such as electric sparks. Wireless Power Transfer (WPT) technology solves these problems well.

[0003] With the diversification and complexity of the electrical industry, an appliance often contains a large number of electronic devices, and each has its own power supply requirements. The traditional single-input single-output WPT system is difficult to meet the power supply needs of multiple devices. Therefore, a WPT system with multi-output function is the key to solving this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a wireless power supply system with dual constant voltage output function to solve the problem that the traditional single-input single-output WPT system cannot simultaneously meet the power supply requirements of different devices.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A wireless power supply system with dual constant voltage output function, characterized in that the system includes a transmitting part and a receiving part, wherein the transmitting part is powered by a DC power supply U D , inverter (Q1-Q4), compensation capacitor C1 and transmitting coil L P The receiving part consists of a receiving coil L S , compensation inductors L1 and L2, compensation capacitors (C2-C4), rectifier 1 (D1-D4), rectifier 2 (D5-D8), two filter capacitors C F1 and C F2 And two loads R L1 and R L2 composition;

[0007] The DC power supply U D Connected to the input end of the inverter, one end of the inverter output is connected to one end of the compensation capacitor C1, and the other end of the compensation capacitor C1 is connected to the transmitting coil L P One end of the transmitting coil L P The other end of is connected to the other end of the output of the inverter to form a transmitting circuit;

[0008] The receiving coil L SOne end of the compensation capacitor C2 and one end of the compensation inductor L1 are connected, and the other ends of the compensation capacitor C2 and the compensation inductor L1 are connected to the input ends of the rectifier 1 respectively. S The other end of the compensation capacitor C3 and one end of the compensation inductor L2 are connected to the input ends of the rectifier 2 respectively. The compensation capacitor C4 is connected between C2 and C3 to form a receiving loop. The output ends of the rectifier 1 are connected to the filter capacitor C F1 For load R L1 Provide a constant supply voltage, the output of rectifier 2 is connected to the filter capacitor C F2 For load R L2 Provide a constant supply voltage;

[0009] The resonance relationship of the compensation element of the wireless power supply system with dual constant voltage output function is determined by the following formula:

[0010]

[0011] Where, ω is the system resonant angular frequency;

[0012] The output voltage of the wireless power supply system with dual constant voltage output function during operation is calculated by formula (2):

[0013]

[0014] Among them, U D is the DC power supply voltage; M is the transmitting coil L P and receiving coil L S The mutual inductance between

[0015] Furthermore, the rectifier 1 and the load R L1 The first-stage output port of the system, rectifier 2 and load R L2 The second-level output port of the system is independent of each other and can provide a constant power supply voltage for different devices.

[0016] Furthermore, the output voltages of the two-stage output ports can be flexibly adjusted by adjusting the sizes of the compensation inductors L1 and L2, respectively, so that the system can be adapted to the power supply requirements of more devices;

[0017] Furthermore, the inverter of the system can achieve zero phase angle operation, avoiding the influence of reactive circulating current and ensuring efficient operation of the system.

[0018] Beneficial effects of the present invention:

[0019] 1. The present invention designs a wireless power supply system with dual constant voltage output function. The system has two-level output ports that can provide constant power supply voltage for different loads respectively, and can power different devices at the same time.

[0020] 2. The output voltage of the two-stage output port of the present invention can be flexibly adjusted by adjusting the sizes of the compensation inductors L1 and L2 respectively, is not limited by the coupler parameters, and has strong applicability.

[0021] 3. When the present invention supplies power, the inverter can achieve zero phase angle operation, avoiding the influence of reactive circulating current and ensuring efficient operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2 is a circuit architecture diagram of the system of the present invention.

[0023] Figure 2 A simplified circuit diagram of the system of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Attached Figure 1 The system circuit architecture diagram of the invention is shown in FIG. Figure 1 The system includes a transmitting part and a receiving part, wherein the transmitting part is powered by a DC power supply U D , inverter (Q1-Q4), compensation capacitor C1 and transmitting coil L P The receiving part consists of a receiving coil L S , compensation inductors L1 and L2, compensation capacitors (C2-C4), rectifier 1 (D1-D4), rectifier 2 (D5-D8), two filter capacitors C F1 and C F2 And two loads R L1 and R L2 Composition: The DC power supply U D Connected to the input end of the inverter, one end of the inverter output is connected to one end of the compensation capacitor C1, and the other end of the compensation capacitor C1 is connected to the transmitting coil L P One end of the transmitting coil L P The other end of the receiving coil L is connected to the other end of the output of the inverter to form a transmitting circuit; SOne end of the compensation capacitor C2 and one end of the compensation inductor L1 are connected, and the other ends of the compensation capacitor C2 and the compensation inductor L1 are connected to the input ends of the rectifier 1 respectively. S The other end of the compensation capacitor C3 and one end of the compensation inductor L2 are connected to the input ends of the rectifier 2 respectively. The compensation capacitor C4 is connected between C2 and C3 to form a receiving loop. The output ends of the rectifier 1 are connected to the filter capacitor C F1 For load R L1 Provide a constant supply voltage, the output of rectifier 2 is connected to the filter capacitor C F2 For load R L2 Provides a constant supply voltage.

[0026] Attached Figure 2 The simplified diagram of the system circuit of the invention is shown, wherein for the full-bridge inverter, its output voltage U in The root mean square value of the DC power supply U D The relationship between can be determined by formula (1):

[0027]

[0028] For a full-bridge rectifier, the output voltage U O1 The relationship between the RMS value of the first-stage receiving side loop voltage U1 and the output voltage U O2 The relationship between the RMS value of the second-stage receiving side loop voltage U2 can be determined by formula (2):

[0029]

[0030] According to Kirchhoff's voltage law (KVL), the voltage equation of the circuit can be listed as:

[0031]

[0032] Where j represents the imaginary unit, ω represents the system resonant angular frequency, and U in Indicates the square wave voltage output by the inverter, I P Represents the current vector of the transmitting side loop, I S represents the current vector of the receiving side loop, I1 and I2 represent the input current vectors of the first and second stage rectifiers respectively. M is the transmitting coil L P and receiving coil L S The mutual induction between.

[0033] Through analysis and calculation, in order to meet the requirements of constant voltage output and zero phase angle operation of the inverter, the relationship between the system compensation components must meet the following conditions:

[0034]

[0035] Combining equation (3) and equation (4), we can get the output current vector I of the inverter: P , the expressions of the first and second stage rectifier input current vectors I1 and I2:

[0036]

[0037] According to formula (5), the expressions of the output voltage vectors U1 and U2 of the first and second stage rectifiers can be obtained:

[0038]

[0039] Substituting equations (1) and (2) into equation (6), we can further obtain the output voltage U of the first and second stage output ports: O1 and U O2 The expression is:

[0040]

[0041] Observing formula (7), we can find that the output voltage U of the first and second output ports of the system is O1 and U O2 Both output ports of the system can achieve constant voltage power supply. O1 and U O2 The compensation inductances L1 and L2 can be adjusted flexibly, are not limited by the coupler parameters, and have strong applicability.

[0042] According to equation (5), the input impedance Z of the system is in It can be derived and simplified as:

[0043]

[0044] It can be found from formula (8) that the input impedance Z in The value of is fully resistive, so the inverter can achieve zero phase angle operation, avoiding the influence of reactive circulating current and ensuring the high efficiency of the system.

[0045] It should be understood that the parts not elaborated in detail in this specification belong to the prior art. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any simple modification, equivalent transformation and modification within the technical scheme and principle of the present invention still fall within the protection scope of the present invention.

Claims

1. A wireless power supply system with dual constant voltage output function, characterized in that: The system includes a transmitting part and a receiving part, wherein the transmitting part is powered by a DC power supply U D , inverter (Q1-Q4), compensation capacitor C1 and transmitting coil L P The receiving part consists of a receiving coil L S , compensation inductors L1 and L2, compensation capacitors (C2-C4), rectifier 1 (D1-D4), rectifier 2 (D5-D8), two filter capacitors C F1 and C F2 And two loads R L1 and R L2 composition; The DC power supply U D Connected to the input end of the inverter, one end of the inverter output is connected to one end of the compensation capacitor C1, and the other end of the compensation capacitor C1 is connected to the transmitting coil L P One end of the transmitting coil L P The other end of is connected to the other end of the output of the inverter to form a transmitting circuit; The receiving coil L S One end of the compensation capacitor C2 and one end of the compensation inductor L1 are connected, and the other ends of the compensation capacitor C2 and the compensation inductor L1 are connected to the input ends of the rectifier 1 respectively. S The other end of the compensation capacitor C3 and one end of the compensation inductor L2 are connected to the input ends of the rectifier 2 respectively. The compensation capacitor C4 is connected between C2 and C3 to form a receiving loop. The output ends of the rectifier 1 are connected to the filter capacitor C F1 For load R L1 Provide a constant supply voltage, the output of rectifier 2 is connected to the filter capacitor C F2 For load R L2 Provide a constant supply voltage; The rectifier 1 and the load R L1 The first-stage output port of the system, rectifier 2 and load R L2 The second-level output port of the system is independent of each other and can provide a constant power supply voltage for different devices. The output voltage of the two-stage output port can be flexibly adjusted by adjusting the size of the compensation inductors L1 and L2 respectively, so that the system can be adapted to the power supply requirements of more devices; The inverter of the system can achieve zero phase angle operation, avoid the influence of reactive circulating current, and ensure the high efficiency of the system.

2. The resonance relationship of the compensation element of the wireless power supply system with dual constant voltage output function according to claim 1 is determined by formula (1): in, ω is the system resonant angular frequency; The output voltage of the wireless power supply system with dual constant voltage output function during operation is calculated by formula (2): Among them, U D is the DC power supply voltage; M is the transmitting coil L P and receiving coil L S The mutual inductance between them.

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