CN103368281A - Resonant radio energy transmitting device with PFC (power factor correction) - Google Patents

Abstract

The invention discloses a resonant wireless power transmission transmitting device with PFC, which comprises a single-phase PFC link, a DC-AC converter link and an output resonant network, and the DC-AC converter link is connected in parallel to the PFC link and the output between resonant networks. The single-phase PFC link and the DC-AC converter link of the present invention jointly constitute an AC-DC-AC converter, and the single-phase PFC link has the function of power factor correction, which reduces the pollution to the power grid.

Description

A resonant wireless power transmission transmitter with PFC

technical field

The invention relates to the application field of wireless power transmission technology, in particular to a resonant wireless power transmission transmitting device with PFC.

Background technique

In the 1960s, magnetic induction power transmission was tried in medical equipment. In the 1970s, the concept of resolver appeared. In the 1980s, inductive power transmission was well theoretically explored and developed in wireless charging of electric vehicles In practice, in the 1990s, scholars at the University of Auckland in New Zealand enriched and perfected the concept of ICPT (inductive coupled power transfer, ICPT) technology, that is, inductively coupled power transfer. In 2005, the research team of City University of Hong Kong successfully developed a universal non-contact charging platform, which is of great significance to the development of wireless power transmission. In 2006, researchers at the Massachusetts Institute of Technology (MIT) successfully lit a 60W light bulb with 40% efficiency at a distance of about 2m using physical resonance technology. This experiment became another new breakthrough in wireless power transmission technology. , and set off an upsurge of research on wireless power transmission all over the world.

As a transmitting device for wireless power transmission, especially as a transmitting device for high-frequency resonant wireless power transmission, there have been relatively in-depth researches at home and abroad. As a traditional power amplifier circuit, such as Class A, Class B, and Class C power amplifier circuits, the technology is quite mature, but these power amplifier circuits generally have the problem of low efficiency. The switch-type D, E, and DE power amplifier circuits overcome the shortcomings of traditional power amplifier circuits, make the switch tube work in the switch state, and improve the conversion efficiency of the power amplifier circuit.

However, the current power amplifier circuit used as a wireless energy transmission device does not take into account the power factor of the power input, which is easy to cause pollution to the power grid, and the input of the transmitter is not isolated from the DC power supply. The DC input voltage of the power amplifier circuit must be provided by another DC The power supply is provided, so the volume of the wireless power transfer transmitting device is increased, and the cost is relatively high.

Contents of the invention

In order to overcome the disadvantages and deficiencies of the above-mentioned prior art, the present invention provides a resonant wireless power transmission transmitter with PFC.

The invention integrates the active power factor correction link and the DC-AC converter link with isolation, thereby forming a new AC-DC-AC converter, which has power factor correction and realizes a resonant wireless power transmission transmitting device at the same time.

The present invention adopts following technical scheme:

A resonant wireless power transmission transmitter with PFC, comprising a single-phase PFC link, a DC-AC converter link and an output resonant network, the DC-AC converter link is connected in parallel to the single-phase PFC link and the output resonant network between.

The single-phase PFC link is composed of a rectifier bridge, an input inductor L ₁ , a first MOS transistor S ₁ , a diode D ₅ and an output filter capacitor C _o ;

The DC-AC converter link is composed of a high-frequency transformer T and a second MOS transistor _S2 ;

The output resonant network is composed of a resonant inductor L ₂ , a resonant capacitor C ₂ and an equivalent load R.

One end of the input inductance _L1 is connected to the common cathode of the rectifier bridge, and the other end of the input inductance _L1 is respectively connected to the drain of the first MOS transistor _S1 and the anode of the diode _D5 , and the cathodes of the diode _D5 are respectively It is connected with one end of the output filter capacitor C _o and one end of the primary side of the high-frequency transformer T, the other end of the primary side of the high-frequency transformer T is connected with the drain of the second MOS transistor _S2 , and the output filter capacitor C _o The other end is respectively connected to the source stage of the second MOS transistor _S2 , the source stage of the first MOS transistor _S1 , and the common anode of the rectifier bridge; the secondary side of the high-frequency transformer T is connected to the resonant inductor _L2 and the resonant capacitor C ₂ and the equivalent load R are connected to form a loop.

The diode _D5 is a rectifier diode.

The output resonant network is composed of a resonant coil, which is equivalent to a resonant inductance L ₂ , a resonant capacitor C ₂ and a coil internal resistance.

The resonant coil is a space spiral structure or a planar spiral structure.

The resonant capacitor _C2 is the stray capacitance of the resonant coil or an external compensation capacitor, and the resonant inductance is the equivalent inductance of the resonant coil.

Compared with prior art, the present invention has following advantage:

The single-phase PFC link and the DC-AC converter link of the present invention jointly constitute an AC-DC-AC converter. The single-phase PFC link has the function of power factor correction, which reduces the pollution to the power grid;

The DC-AC converter uses a high-frequency transformer to realize the isolation of the primary side and the secondary side, which can adjust the output voltage in a wide range and has high conversion efficiency;

The invention has simple circuit structure, few power devices, simple control circuit and high efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of a resonant wireless power transmission transmitting device with PFC;

Fig. 2 is the realization circuit diagram of the Boost converter based on L6562 in the PFC link in Fig. 1;

Fig. 3 is the output voltage waveform diagram in Fig. 2;

Fig. 4 is the input current waveform in Fig. 2;

Fig. 5 is the voltage waveform on the equivalent load of the output resonant network in Fig. 1;

Fig. 6 is a schematic diagram of the resonant coil in Fig. 1 having a spatial spiral structure;

FIG. 7 is a schematic diagram of the planar spiral structure of the resonant coil in FIG. 1 .

Detailed ways

The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

As shown in Figure 1: a resonant wireless power transmission transmitter with PFC, including a single-phase PFC link, a DC-AC converter link and an output resonant network, the DC-AC converter link is connected in parallel to the PFC link and the output resonant network.

The single-phase PFC link is composed of a rectifier bridge, an input inductance L ₁ , a first MOS transistor S ₁ , a diode D ₅ and an output filter capacitor C _o to realize input power factor correction;

The DC-AC converter link is composed of a high-frequency transformer T and a second MOS transistor _S2 , which realizes the exchange from DC to AC;

The output resonant network is composed of a resonant inductor L ₂ , a resonant capacitor C ₂ and an equivalent load R.

The equivalent load R is the load reflected from the wireless power transmission receiving end to the transmitting end.

The rectifier bridge in the single-phase PFC link is composed of four diodes, and the above-mentioned transmitting device is specifically connected as follows: one end of the input inductance _L1 is connected to the common cathode of the rectifier bridge, and the other end of the input inductance _L1 is respectively connected to the first The drain of the MOS transistor _S1 is connected to the anode of the diode _D5 , and the cathode of the diode _D5 is respectively connected to one end of the output filter capacitor C _o and one end of the primary side of the high-frequency transformer T, and the primary side of the high-frequency transformer T The other end of the side is connected to the drain of the second MOS transistor _S2 , and the other end of the output filter capacitor C _o is respectively connected to the source stage of the second MOS transistor _S2 , the source stage of the first MOS transistor _S1 , and the rectifier bridge The common anode connection of the high-frequency transformer T is connected with the resonant inductor L ₂ , the resonant capacitor C ₂ and the equivalent load R in turn to form a loop.

The diode _D5 is a rectifier diode.

The output resonant network is composed of a resonant coil, the resonant capacitor C ₂ is the stray capacitance of the resonant coil or an external compensation capacitor, and the resonant inductance L ₂ is the equivalent inductance of the resonant coil.

As shown in Figure 2, the working principle of the circuit: when the first MOS transistor _S1 is turned on, the input voltage is applied to the inductor _L1 , and the potential of the secondary winding is -V _in /N (N is the primary-secondary transformation ratio); When the first MOS transistor S ₁ is turned off, the voltage of the inductor is V _o -V _in , and the potential of the secondary winding is V _o -V _in /N; when the inductor current is intermittent, the voltage of the inductor is zero, and the potential of the secondary winding potential is also zero. L6562 uses the characteristic that the potential of the secondary winding is zero when the inductance is intermittent. When the first MOS transistor S ₁ is in the off state, it detects the potential of the secondary winding. When the potential of the secondary winding is less than 2.1V, it turns on The first MOS transistor S ₁ . The sampling signal of the output voltage of the rectifier bridge obtained by pin 3 of the L6562 is multiplied by the error amplification signal of the output voltage and then used as the reference for the switch off signal. When the potential of R ₆ reaches this reference, the first MOS transistor S ₁ is turned off. , the critical continuous working mode of the inductor current can be obtained.

The input voltage of the circuit shown in Figure 2: V _in =220VAC, the output voltage: V _o =400VDC.

As shown in Figure 3, the PFC link is based on the L6562-based Boost converter. In the circuit diagram, the output DC voltage of the PFC link is 400V, which is in line with the designed value. Figure 4 is the input current waveform diagram in the circuit of Figure 2. The figure shows that the input current is a relatively standard sinusoidal waveform, which meets the requirements of power factor correction.

As shown in Figure 5, the output voltage waveform of the DC-AC converter is the voltage waveform at both ends of the equivalent load R of the output resonant network. It can be seen from the figure that the output voltage waveform is a standard sine wave with a small degree of distortion, which can be used as a power amplifier circuit for a resonant wireless power transmission transmitter.

The resonant coil shown in Figure 6 is a spatial spiral structure. The coil shown in Figure 7 is a planar spiral structure, which has the advantages of small size, easy integration, and simple manufacturing process.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the embodiment, and any other changes, modifications, substitutions and combinations made without departing from the spirit and principle of the present invention , simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present invention.

Claims (7)

1. resonance type wireless delivery of electrical energy emitter with PFC, it is characterized in that, comprise a Single-phase PFC link, DC-AC converter link and export resonance network, described DC-AC converter link is connected in parallel between Single-phase PFC link and the export resonance network.

2. a kind of resonance type wireless delivery of electrical energy emitter with PFC according to claim 1 is characterized in that, described Single-phase PFC link is by rectifier bridge, input inductance (L ₁), the first metal-oxide-semiconductor (S ₁), diode (D ₅) and output filter capacitor (C _o) consist of;

Described DC-AC converter link is by high frequency transformer (T) and the second metal-oxide-semiconductor (S ₂) consist of;

Described export resonance network is by resonant inductance (L ₂), resonant capacitance (C ₂) and equivalent load (R) formation.

3. a kind of resonance type wireless delivery of electrical energy emitter with PFC according to claim 1 is characterized in that described input inductance (L ₁) an end be connected input inductance (L with the common cathode of rectifier bridge ₁) the other end respectively with the first metal-oxide-semiconductor (S ₁) drain electrode and diode (D ₅) anodic bonding, described diode (D ₅) negative electrode respectively with output filter capacitor (C _o) the end on an end, the former limit of high frequency transformer (T) connect the other end on the former limit of described high frequency transformer (T) and the second metal-oxide-semiconductor (S ₂) drain electrode connect described output filter capacitor (C _o) the other end respectively with the second metal-oxide-semiconductor (S ₂) source class, the first metal-oxide-semiconductor (S ₁) the common anode utmost point of source class, rectifier bridge connect; The secondary of described high frequency transformer (T) successively with resonant inductance (L ₂), resonant capacitance (C ₂) and equivalent load (R) connect and compose the loop.

4. a kind of resonance type wireless delivery of electrical energy emitter with PFC according to claim 2 is characterized in that described diode (D ₅) be rectifier diode.

5. a kind of resonance type wireless delivery of electrical energy emitter with PFC according to claim 1 is characterized in that described export resonance network is made of resonance coil.

6. a kind of resonance type wireless delivery of electrical energy emitter with PFC according to claim 5 is characterized in that described resonance coil is spatially spiral structure or snail structure.

7. a kind of resonance type wireless delivery of electrical energy emitter with PFC according to claim 2 is characterized in that described resonant capacitance (C ₂) be the building-out capacitor that the stray electrical of resonance coil perhaps adds, described resonant inductance (L ₂) be the equivalent inductance of resonance coil.

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