CN104716748B - Middle-distance wireless power supply system and high-frequency variable-frequency power source thereof - Google Patents

Abstract

The invention discloses a medium-distance wireless power supply system and its high-frequency variable frequency power supply, including a wireless communication module, a main control module, a signal generation module, at least two power supply branches, an automatic impedance matching module and a load coil. module, the main control module and the signal generation module are connected in sequence, and each power supply is shunted and connected in parallel between the output end of the signal generation module and the input end of the automatic impedance matching module, and the output end of the automatic impedance matching module is connected to the The load coils are connected, and each power supply branch includes a drive module, a power amplifier module and a filter module connected in sequence, and the main control module is connected to each drive module to control the switch of each drive module. By setting the signal generating module, higher resolution can be realized; by setting the automatic impedance matching module and the power amplifier module, higher power conversion efficiency can be realized; by setting the filter module, the frequency spectrum of the generated high-frequency power signal is single.

Description

Middle distance wireless power supply system and its high frequency variable frequency power supply

technical field

The invention relates to a middle-distance wireless power supply system and its high-frequency variable frequency power supply.

Background technique

In medium distance wireless power supply systems, the efficiency of (wireless) power transfer is highest when the load coil resonant frequency is 2MHz to 10MHz. In order to achieve precise resonance in this frequency band and achieve the most efficient energy transmission, the designed power supply generally needs to meet three conditions: 1. It can have a certain resolution in the entire frequency range; 2. In the entire broadband range Higher power conversion efficiency is obtained; 3. The frequency spectrum of the generated high-frequency power signal is single. Therefore, it is necessary to design a new high-frequency variable frequency power supply for medium-distance wireless power supply systems.

Contents of the invention

The invention provides a new middle-distance wireless power supply system and its high-frequency variable frequency power supply.

The present invention provides a high-frequency variable frequency power supply for a medium-distance wireless power supply system, including a wireless communication module, a main control module, a signal generation module, at least two power supply branches, an automatic impedance matching module, and a load coil. The wireless communication module, The main control module and the signal generation module are connected in sequence, each of the power sources is shunted and connected in parallel between the output end of the signal generation module and the input end of the automatic impedance matching module, and the output end of the automatic impedance matching module is connected to the input end of the automatic impedance matching module. The load coils are connected, and each power supply branch includes a sequentially connected drive module, power amplifier module and filter module, and the main control module is connected to each drive module to control the switch of each drive module.

The wireless communication module receives the frequency parameters required for the power transmission of the load coil. The main control module adjusts the signal generation module according to the frequency parameters to generate multiple driving signals corresponding to multiple frequency bands. The main control module controls the switches of each driving module to gate One power supply branch, the driving signal of the strobe power supply branch is sequentially amplified and filtered, then input to the automatic impedance matching module, after impedance matching, finally input to the load coil.

The signal generation module includes a signal generator module and a digital isolator module connected in sequence, the main controller is connected to the input of the signal generator module, and the digital isolator module is connected to the input of each of the drive modules end.

The digital isolator module is used to isolate signals and noises, and it can adopt an existing digital isolator or a circuit structure or circuit module with the same function.

Each of the power supply branches further includes an isolation module, the drive module, the power amplifier module, the filter module and the isolation module are connected in sequence, and the output end of each isolation module is connected to the input end of the automatic impedance matching module. The main control module is connected to each isolation module to control the switch of each isolation module.

The isolation module of the gating power supply branch is opened, so that the sinusoidal power signal obtained after filtering can be input into the automatic impedance matching module. The isolation module of the non-selected power supply branch is disconnected to prevent the signal of the non-selected power supply branch from interfering with the gated power supply branch.

The high-frequency variable frequency power supply also includes a standing wave detection and protection module, the standing wave detection and protection module is connected to the main control module and the output terminals of each power branch, such as connecting the output terminals of each isolation module to the main control module.

The standing wave detection and protection module can be connected with the main control module with two-way signals.

The main control module may be an MCU.

A medium-distance wireless power supply system includes the high-frequency variable frequency power supply.

A method for controlling a high-frequency variable-frequency power supply of a medium-distance wireless power supply system, comprising the following steps:

a) Receive the frequency parameters required for the power transmission of the load coil;

b) generating a plurality of driving signals corresponding to a plurality of frequency bands according to the frequency parameters, each of the driving signals corresponding to a power branch;

c) gating one power supply branch, and the driving signal of the selected power supply branch is sequentially amplified and filtered to obtain a sinusoidal power signal with a single frequency spectrum;

d) The sinusoidal power signal is input into the load coil after impedance matching.

In the step c), all the power shunts that are not gated are isolated.

In the step d), the standing wave ratio is monitored in real time, and the power supply is automatically cut off when the standing wave ratio is greater than the set value.

The beneficial effects of the present invention are: by setting the signal generating module, higher resolution can be realized; by setting the automatic impedance matching module and the power amplifier module, higher power conversion efficiency can be realized; by setting the filter module, the generated high frequency The power signal spectrum is single.

Description of drawings

Fig. 1 is a block diagram of the circuit principle of the high frequency variable frequency power supply in this embodiment.

detailed description

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figure 1, the high-frequency variable frequency power supply of the distance wireless power supply system in this embodiment includes a wireless communication module, a main control module, a signal generation module, at least two power supply branches, an automatic impedance matching module and a load coil. The wireless communication module, the main control module and the signal generating module are connected in sequence. Each power branch corresponds to a frequency band. Each power branch is connected in parallel between the output end of the signal generation module and the input end of the automatic impedance matching module, and the load coil is connected with the output end of the automatic impedance matching module. The signal generating module includes a signal generator module and a digital isolator module connected in sequence, and each power branch includes a driver module, a power amplifier module, a filter module and an isolation module connected in sequence, and the input terminals of the driver modules of each power branch It is connected with the output end of the digital isolator module, and the output end of the isolation module of each power branch is connected with the input end of the automatic impedance matching module. The main control module outputs control signals to the drive modules of each power supply branch and the isolation modules of each power supply branch, so as to realize the switch control of each drive module and the switch control of each isolation module.

The wireless communication module can adopt various circuit structures or modules capable of realizing wireless communication. The main control module is used to realize the coordination and control of each module of the high-frequency variable frequency power supply, such as MCU (microcontroller). The automatic impedance matching module is used to realize the automatic matching of the load coil resistance and the internal resistance of the power supply.

The high-frequency variable frequency power supply may also include a standing wave detection and protection module, which is connected to the output terminals of each isolation module and the main control module.

The working principle of high frequency variable frequency power supply is as follows:

a) The wireless communication module receives the frequency parameters required for power transmission of the load coil;

b) The main control module adjusts the signal generator module in the signal generation module according to the received frequency parameters, and then generates a driving signal of a corresponding frequency after passing through the digital isolator module;

c) The drive signal is divided into multiple frequency bands by the main control module and sent to the drive module corresponding to the power branch;

d) The main control module controls the switch of each power branch drive module, so that only one power branch maintains the path at each moment, and the power branches do not interfere with each other, that is, at each moment, there is only one power branch The driver module of the road is opened;

e) The driving signal of the gating power supply branch is amplified by the power amplifier module to obtain the power required by the load coil, and then a sinusoidal power signal with a single frequency spectrum is obtained through the filter module; Each power supply shunt is isolated to prevent signal interference;

f) The obtained sinusoidal power signal is injected into the load coil through the automatic impedance matching module. The automatic impedance matching module can keep the load coil at 50 ohms (the resistance can also be designed to other resistance values according to the internal resistance of the power supply and the load coil), so that the power signal can be input into the load coil with maximum efficiency, so as to meet all the requirements of wireless transmission.

When the automatic impedance matching cannot meet the requirements, resulting in relatively large reflected power, the main control module can obtain this result by monitoring the standing wave ratio of the back end. In order to protect the power supply, when the standing wave ratio is relatively large, the standing wave detection and protection module can automatically cut off the power supply, so that the power supply will not be burned.

The above content is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. Those of ordinary skill in the technical field to which the present invention belongs can also make some simple deduction or replacement without departing from the concept of the present invention.

Claims (6)

1. a kind of middle high frequency variable-frequency power sources apart from wireless power supply system, it is characterised in that including wireless communication module, master control mould Block, at least signal generating module, two-way power supply branch, automatic impedance matching module and loading coil, the wireless communication module, Main control module and signal generating module are sequentially connected with, each power supply branch be connected in parallel on the signal generating module output end and Between the input of automatic impedance matching module, the output end of the automatic impedance matching module is connected with the loading coil, Each power supply branch includes the drive module, power amplifier module and the filter module that are sequentially connected with, the main control module and each drive Dynamic model block controls the switch for connecting and controlling each drive module；The wireless communication module receives loading coil power and passes Frequency parameter required for defeated, the main control module adjusts the signal generating module according to the frequency parameter, and generation correspondence is more Multiple drive signals of individual frequency range, the main control module gates the electricity all the way by controlling the switch of each drive module Source branch, the drive signal of the gating power branch is input into the automatic impedance matching module after sequentially passing through amplification, filtering, enters After row impedance matching, the loading coil is recently entered.

2. high frequency variable-frequency power sources as claimed in claim 1, it is characterised in that each power supply branch also includes isolation module, The drive module, power amplifier module, filter module and isolation module are sequentially connected with, the output end of each isolation module and institute State the input connection of automatic impedance matching module, the main control module and each isolation module control be connected and control it is each described in The switch of isolation module.

3. high frequency variable-frequency power sources as claimed in claim 1, it is characterised in that the signal generating module includes what is be sequentially connected with Signal generator module and digital isolator module, the main control module connect the input of the signal generator module, institute State the input that digital isolator module connects each drive module.

4. high frequency variable-frequency power sources as claimed in claim 1, it is characterised in that described also including standing wave detection and protection module Standing wave detection is connected the output end of the main control module and each power supply branch with protection module.

5. apart from wireless power supply system in one kind, it is characterised in that become including the high frequency described in any one in claim 1-4 Frequency power.

6. in a kind of 1-4 such as claim as described in any one apart from wireless power supply system high frequency variable-frequency power sources control Method, it is characterised in that comprise the following steps：

A) frequency parameter required for wireless communication module receives loading coil power transmission；

B) main control module generates multiple drive signals of correspondence multiple frequency ranges, each described drive signal according to the frequency parameter Corresponding power supply branch all the way；

C) main control module gates power supply branch all the way, and the drive signal of the power supply branch being strobed is sequentially passed through to be put Greatly, the single sinusoidal power signal of frequency spectrum is obtained after filtering；

D) sinusoidal power signal is by after impedance matching, being input into the loading coil.