CN102857134B - High-frequency inverter power supply of wireless power transmission device and frequency doubling control method for inverter power supply - Google Patents

Abstract

The invention discloses a high-frequency inverter power supply of a wireless power transmission device and a frequency doubling control method for the inverter power supply. An inverter frequency doubling circuit (2) consists of n sets of parallel inverter units (2'); a main controller (8) determines output power and output frequency according to the working conditions of a noncontact transformer (4) and a load (7), adjusts duty ratios of pulses and phases between the pulses and sends driving pulse signals; the n sets of inverter units (2') of the inverter frequency doubling circuit (2) are driven to act by a driving circuit (13) in a time division mode, so that the output voltage frequency or the current frequency of the inverter frequency doubling circuit (2) is n times those of the inverter units (2'), and adjustment of a 1 to n-times output frequency range is realized; and a primary resonant capacitor (5) and a secondary resonant capacitor (5') can be adjusted according to the output frequency of the inverter frequency doubling circuit (2) to keep efficient transmission, wherein n is an integer not less than 1.

Description

High-frequency inverter power supply of wireless power transmission device and its frequency multiplication control method

technical field

The invention relates to a high-frequency inverter power supply for a wireless energy transmission device and a frequency multiplication control method thereof.

Background technique

At present, electrified transportation vehicles such as electric vehicles and urban rail transit are charged or powered by contact, especially urban rail transit, etc., are powered by mobile contact between catenary and pantograph. Sparks and friction are likely to cause carbon deposition due to poor contact Dust, low safety and reliability of power supply, serious pollution, heavy maintenance workload, and equipment service life are also affected. When encountering harsh environments such as rain and snow, contact power supply has obvious limitations. Wireless power supply technology can effectively solve the above problems. Its characteristics are: (1) No physical contact is required between the power supply and the load unit, electrical insulation, safety and reliability; (2) There is no exposed conductor, and the power transmission capacity is not affected by environmental factors. (3) There is no mechanical wear, reliable, durable, and maintenance-free. Wireless power supply technology can be used for wireless power supply in urban rail transit, electric vehicles, automation equipment, etc., as well as power supply in harsh environments such as underwater, mine, flammable and explosive.

The basic composition of the wireless power transmission device includes a non-contact transformer, a high-frequency inverter, a high-frequency resonant circuit, etc., which provides an effective method for flexible, safe, reliable, and convenient power supply to electrified vehicles and other mobile devices.

The development direction of wireless power transmission is large air gap, high power, high frequency and high efficiency. However, the power level and switching frequency of high-frequency power electronic devices are not high at present, and the power and frequency levels of a single power electronic device are difficult to meet the needs of high-power wireless power transmission devices. How to effectively, economically and reasonably increase and flexibly adjust the output frequency of the high-frequency inverter is one of the core issues of wireless power transmission. In addition, in wireless power transmission, the mutual inductance between primary and secondary and the coupling coefficient between them play a crucial role in power transmission efficiency. The gap and mutual position between them have a great influence on the mutual inductance between their windings. When the winding mutual inductance is reduced, the efficiency drops significantly. Therefore, how to improve the adaptability of the air gap of the wireless power transmission transformer and ensure high transmission efficiency when the mutual inductance decreases due to factors such as changes in the primary and secondary mutual positions is another core issue of wireless power transmission.

Japanese Patent Application Publication No. H04-317527 discloses a non-contact charging device. In order to achieve high-efficiency power transfer, the secondary coil must be precisely located at the corresponding position, which has strong constraints on the primary and secondary positional relationship and space.

The non-contact power transmission device proposed in Chinese patent 200710163025.3 is used for battery car charging. Its primary coil and secondary coil are both flat and helically wound, similar to a circular flat plate. Efficiency, once there is a positional deviation between the primary and secondary stages, the transfer efficiency will drop significantly.

In the non-contact charging device disclosed in Chinese patent 200810234555.7, the primary coil is a parallel wire, and the secondary coil is wound on a magnetic core, wherein the primary coil needs to pass through the secondary magnetic core, and the lateral relative position of the primary and secondary is greatly affected Limitations, limited to the occasions where the primary coil is fixed and the secondary coil has a fixed path of motion.

In the above prior art, the primary and secondary positions of the transformer are severely constrained, and the practicability is not strong. The main reason why the non-contact power supply transformer is sensitive to the relative position of the primary and secondary is that the relative position change of the primary and secondary causes a large change in the mutual inductance between the primary and secondary, thus affecting the output power and efficiency. In the case of the same relative position of the primary and secondary of the transformer, increasing the transmission frequency can obtain a higher voltage on the secondary of the transformer, which can effectively improve the transmission power and efficiency, and solve this problem. Since the coupling coefficient of the non-contact transformer is much smaller than that of ordinary industrial transformers, it is a loosely coupled transformer. In order to improve the transmission efficiency, the frequency of up to tens of kHz is used for transmission.

In order to increase the transmission frequency, a high-frequency MOSFET can be used as the main switching device of the converter to form a high-frequency inverter power supply. However, due to the relatively small voltage and current ratings of MOSFETs, high-power devices require a large number of devices to be used in series and parallel, which reduces system reliability. The device capacity of IGBT is much higher than that of MOSFET, and there is no problem of poor reverse recovery characteristics of parasitic diodes, which is suitable for high-power applications. However, the turn-off loss caused by the IGBT tail current in the high-frequency switching state is very large, which limits the increase of its operating frequency. In the field of induction heating power supplies, the current IGBT switching frequency can work at 100kHz in the zero current switching (ZCS) state.

The literature "Cai Hui, Zhao Rongxiang, Chen Huiming, Wang Shiping. Research on double-frequency IGBT induction heating power supply [J], Chinese Journal of Electrical Engineering, 2006, 26 (2): 154-158." describes a method based on IGBT relying on resonance The oscillating current of the circuit forms the effect that the frequency of the load current is twice the operating frequency of the switching tube. This method not only requires an additional resonant circuit, but also has a limited increase in frequency. use efficiently.

In the document "Shen Jinfei, Hui Jing, Wu Lei, Yan Wenxu. Frequency multiplication time-sharing control IGBT 180kHz/50kW high-frequency induction welding power supply [J], Journal of Welding, 2009, 30 (9): 1-4." The IGBT connected in parallel to each bridge arm of the inverter adopts the time-sharing control method to improve the work of the inverter and realize the frequency multiplication output of the inverter. However, the output frequency multiple of this method is fixed, and it does not involve how to change the frequency multiplication operation.

Compared with the induction heating power supply, the wireless power transmission system has its own particularity: (1) The efficiency requirements are different: as electric energy transmission, the transmission efficiency is higher, so the circuit topology and control method are required to be more efficient; (2) Inversion The relative position of the primary and secondary of the non-contact transformer in wireless power transmission has a certain range of variation. When the relative position of the primary and secondary of the non-contact transformer changes and the mutual inductance of the primary and secondary decreases, the efficiency can be improved by increasing the transmission frequency; and when the non-contact transformer When the mutual inductance is large, increasing the transmission frequency does not improve the efficiency significantly, and will bring additional inverter losses; (3) Capacitance matching: the frequency of the induction heating power supply is relatively fixed, and the capacitance value generally remains unchanged, while wireless energy transmission Due to the wide range of transmission frequency changes in the system, the capacitance value of the resonant capacitor must be changed to match the inductance and transmission frequency parameters to maintain high efficiency.

Contents of the invention

The purpose of the present invention is to overcome the problems of low adaptability to primary and secondary relative positions and low transmission efficiency of existing non-contact transformers, and propose a frequency-multiplier high-frequency inverter power supply and its frequency-multiplication control method for wireless energy transmission devices . The invention adopts a plurality of inverter units connected in parallel to form an inverter frequency multiplication circuit. According to the non-contact transformer and load conditions in the wireless power transmission system, the output frequency of the inverter frequency multiplication circuit can be automatically adjusted in a large range. The switching device level produces a working frequency much higher than the switching frequency. By increasing the working frequency, the non-contact transformer has a higher induced voltage in the same relative position of the primary and secondary, thereby improving the adaptability of the non-contact transformer to the relative position of the primary and secondary. sex. The transmission frequency can be adjusted according to the non-contact transformer and load conditions to achieve the best efficiency. The primary resonant capacitor and the secondary resonant capacitor can also be adjusted with the frequency adjustment to match the inductance and frequency to maintain high efficiency. The invention adjusts the output power through the inverter, does not need an additional conversion circuit, saves the DC power adjustment link, and reduces the loss. The invention can improve power supply frequency and transmission efficiency, improve the applicability of the relative position between primary and secondary, improve transmission efficiency and system availability; the invention can also reduce system size and weight by increasing power supply frequency.

The technical solution adopted by the present invention to solve technical problems is as follows:

The frequency doubling high-frequency inverter power supply of the wireless energy transmission device of the present invention includes: a DC power supply, an inverter frequency doubling circuit, a main controller, a secondary controller, a primary resonant capacitor, a secondary resonant capacitor, and a primary capacitor compensation regulator , secondary capacitance compensation regulator, non-contact transformer, frequency and phase detection module, primary state quantity detection sensor, secondary state quantity detection sensor, primary communication module, secondary communication module, rectifier, load and drive circuit, etc.

The DC power supply obtains a high-frequency voltage after passing through an inverter frequency multiplication circuit, and then connects to the primary side of the non-contact transformer through a primary resonant capacitor. A primary state quantity detection sensor is arranged between the output terminal of the frequency multiplication circuit of the inverter and the primary resonant capacitor. The primary state quantity detection sensors include voltage sensors, current sensors, temperature sensors, air gap sensors and position sensors, etc., and the voltage sensors, current sensors, temperature sensors, air gap sensors and position sensors respectively detect the Output voltage, output current, temperature of inverter frequency multiplier circuit, air gap between primary and secondary of non-contact transformer, and relative position between primary and secondary. The secondary of the non-contact transformer passes through the secondary resonant capacitor and the rectifier to obtain DC power and supply it to the load. A secondary state quantity sensor is provided between the rectifier and the load. The secondary state quantity sensor includes a voltage sensor and a current sensor, and the voltage sensor and the current sensor respectively detect the voltage and current output by the rectifier. After the inverter output voltage and current signals detected by the primary state quantity detection sensor enter the frequency and phase detection module, the obtained inverter output current frequency signal and the difference between the inverter output voltage and the inverter output current The phase difference signal is sent to the master controller. All signals detected by the primary state quantity detection sensors are sent to the main controller. The secondary state quantity detection sensor sends the voltage and current signals output by the rectifier to the secondary controller, and the secondary controller sends the voltage signal and current signal output by the rectifier to the primary communication module through the secondary communication module. The voltage signal and current signal output by the rectifier are transmitted to the main controller. The main controller synthesizes the signals of the primary state quantity detection sensor and the secondary state quantity detection sensor, and sends the driving pulse of the frequency multiplication circuit of the inverter to the driving circuit, and the driving circuit is connected to the driving terminals of each switching device of the frequency multiplication circuit of the inverter , to drive each switching device of the frequency multiplication circuit of the inverter. When the multiple of the frequency needs to be changed, the main controller sends instructions to the primary capacitance compensation regulator and the secondary capacitance compensation regulator to adjust the capacitance of the primary resonance capacitor and the secondary resonance capacitor.

The DC power source may be a DC source obtained by rectifying an AC power source, or may be a DC source such as a storage battery or a capacitor. The DC power supply can be a voltage source or a current source, corresponding to the frequency multiplication circuit of the voltage source inverter and the frequency multiplication circuit of the current source inverter respectively. The structure of the present invention will be described below by taking the frequency multiplier circuit of a voltage source inverter as an example.

The inverter frequency multiplication circuit is composed of n sets of inverter units connected in parallel. When k sets of inverter units are selected from n sets of inverter units for time-sharing drive, the output voltage frequency or current frequency of the inverter frequency multiplication circuit is The inverter unit outputs k times the voltage frequency or current frequency to form a k-multiple frequency inverter, n is an integer not less than 1, and k is an integer not less than 1 and not greater than n. For voltage type inverter frequency multiplication circuit, described k frequency multiplication inverter refers to that the output voltage frequency of inverter frequency multiplication circuit is k times of inverter unit output voltage frequency; frequency circuit, the k-multiplier inverter means that the output current frequency of the inverter frequency multiplication circuit is k times the output current frequency of the inverter unit, and k is an integer not less than 1. The frequency multiplier circuit of the voltage source inverter is taken as an example below. The frequency multiplication circuit of the inverter can be a single-phase output or a multi-phase output.

Each set of inverter units of the frequency multiplication circuit of the inverter can be a known full-bridge topology, a known half-bridge topology, or other topologies that convert DC to AC. Each switch group in each inverter unit can be a single device, or a series or parallel connection of multiple devices. The power device in the frequency multiplication circuit of the inverter can be a full-control device such as MOSFET, IGBT, IGCT, etc., and the device can have an anti-parallel freewheeling diode, or an antiparallel freewheeling diode can be added.

The primary state quantity detection sensor includes detecting the output voltage of the inverter frequency doubling circuit, the output current of the inverter frequency doubling circuit, the temperature of the inverter frequency doubling circuit, the air gap between the primary and secondary of the non-contact transformer and the relative Sensors for detection of state quantities such as position. The output voltage sensors of the inverter frequency multiplication circuit are respectively connected to the two output terminals of the inverter frequency multiplication circuit; the output current sensors of the inverter frequency multiplication circuit are connected in series to one output line of the inverter frequency multiplication circuit; The temperature sensor of the frequency doubling circuit of the inverter is embedded in the heat sink of the frequency doubling circuit of the inverter; the air gap between the primary and secondary of the non-contact transformer and the relative position sensor are respectively arranged in the primary and secondary of the non-contact transformer. The output signal of the primary state quantity detection sensor is sent to the main controller, and the output signal of voltage and current is sent to the frequency and phase detection module. The secondary state quantity detection sensor includes the output voltage and output current sensors of the rectifier on the secondary side of the non-contact transformer. The output voltage sensors are respectively connected to the two output terminals of the rectifier, and the output current sensor is connected in series to one of the output lines. The output signal of the secondary state quantity detection sensor is sent to the secondary controller.

The non-contact transformer is composed of a primary winding, a secondary winding and structural parts, and there is a certain air gap between the primary winding and the secondary winding.

The primary resonant capacitor and the secondary resonant capacitor can be composed of a single or multiple capacitors; the primary resonant capacitor can be connected in series, parallel or series-parallel with the primary winding, and the secondary resonant capacitor can be connected in series, parallel or in series with the secondary winding connected in parallel.

The rectifier may be composed of an uncontrolled rectifier bridge and a filter capacitor, or may be a controllable rectifier or other topologies that convert AC into DC. The output of the rectifier can be a DC voltage source or a DC current source.

The load mentioned above may be an actual DC load, or may be supplied to the load after passing through other electric energy conversion links, that is, an equivalent load.

In addition to the related connection methods mentioned above, the main controller is also connected with the drive circuit of the frequency multiplication circuit of the inverter. The main controller judges and processes according to the signals sent by the primary state quantity detection sensor and the secondary state quantity detection sensor, sends instructions to the primary capacitance compensation regulator and the secondary capacitance compensation regulator, and adjusts the capacitance to match the inductance and frequency parameters. Matching; the main controller judges and processes according to the signals sent by the primary state quantity detection sensor and the secondary state quantity detection sensor: determines the frequency that the current inverter frequency multiplication circuit should output, which can be from single frequency and its vicinity to n Change between the multiplier frequency and its vicinity; determine the duty cycle of the output voltage of the inverter unit to adjust the output power; determine the phase difference between the output voltage and output current of the inverter frequency multiplier circuit to adjust the inverter multiplier The phase between the output voltage and the output current of the frequency circuit, and finally adjust the frequency, duty cycle and phase of the driving pulse comprehensively, and send it to the driving circuit after the dead zone control, and the driving circuit is connected to each switching device of the frequency multiplication circuit of the inverter Upper drive terminal. The main controller selects k sets from n sets of inverter units according to the required output frequency requirements, and drives them in time-sharing. Or it is equal to 1/(2k), working in turn for 1/k switching cycle, the driving pulse of each inverter unit lags behind 360/k degrees in turn, and the final output voltage frequency of the inverter frequency multiplication circuit is k of the output voltage frequency of a single set of inverter units times, that is, a k-multiplier inverter, where n is an integer not less than 1, and k is an integer not less than and greater than 1.

The frequency and phase detection module calculates the frequency of the output current of the inverter frequency multiplication circuit and the output voltage and The phase difference of the output current is sent to the main controller.

The primary capacitance compensation regulator and the secondary capacitance compensation regulator adjust the capacitance of the primary resonant capacitor and the capacitance of the secondary resonant capacitor according to the instructions of the main controller and the secondary controller respectively, so as to ensure the Capacitance, inductance and frequency parameter matching.

The secondary controller receives the signal from the secondary state quantity detection sensor, and the secondary controller is connected with the secondary communication module to communicate with the primary communication module.

The primary communication module can be connected with the main controller through RS232, RS422, RS485, CAN, Ethernet, etc., and the secondary communication module can be connected with the secondary The controller is connected, and the primary communication module and the secondary communication module can perform wireless communication or wired communication through radio frequency, infrared, RS232, RS422, RS485, CAN, Ethernet, etc.

After the drive circuit processes the drive pulse signal sent by the inverter frequency multiplication circuit, the output of the drive circuit is connected to each switching device drive terminal of the inverter frequency multiplication circuit to drive each of the inverter frequency multiplication circuits. switch device.

The high-frequency inverter power supply of the present invention adopts the topology structure of frequency multiplication inverter and the frequency multiplication control method, so that the frequency output by the inverter can reach several times the switching frequency of the semiconductor device itself, and the output frequency range of the high-power converter is greatly improved. , thereby greatly increasing the secondary induced voltage of the non-contact transformer. Compared with the low resonant frequency, it reduces the influence of the change of the relative position of the transformer primary and secondary on the output power and efficiency, thereby improving the adaptability of the contactless power supply system to the change of the relative position of the transformer primary and secondary, and improving the availability of the system.

The invention can be applied to the fields of inductive wireless power transmission and resonant wireless power transmission.

Description of drawings

Fig. 1 is a block diagram of a full-bridge inverter-type high-frequency inverter power supply and its frequency multiplication control method;

Fig. 2 is a block diagram of a half-bridge inverter type high-frequency inverter power supply and its frequency multiplication control method;

Fig. 3 is the driving pulse and the inverter output voltage waveform when the triple frequency inverter triples the frequency output;

Fig. 4 is the drive pulse and the inverter output voltage waveform when the triple frequency inverter doubles the frequency output;

Fig. 5 is the drive pulse and the inverter output voltage waveform when the triple frequency inverter outputs single frequency;

Among them, 1 DC power supply, 2 inverter frequency multiplication circuit, 2' inverter unit, 3 primary state quantity detection sensor, 3' secondary state quantity detection sensor, 4 non-contact transformer, 5 primary resonance capacitor, 5' secondary Resonant Capacitor, 6 Rectifier, 7 Load, 8 Main Controller, 9 Frequency and Phase Detection Module, 10 Primary Capacitor Compensation Regulator, 10' Secondary Capacitor Compensation Regulator, 11 Secondary Controller, 12 Primary Communication Module, 12' secondary communication module, 13 drive circuits.

Detailed ways

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

Fig. 1 is a block diagram of the first embodiment of the present invention: a frequency multiplication high-frequency inverter power supply of a full-bridge inverter type wireless power transmission device and its frequency multiplication control method, and its basic composition and connection method are as follows.

The high-frequency inverter power supply of the present invention includes: a DC power supply 1, an inverter frequency multiplication circuit 2, a main controller 8, a secondary controller 11, a primary resonant capacitor 5, a secondary resonant capacitor 5', and a primary capacitor compensation regulator 10. Secondary capacitance compensation regulator 10', non-contact transformer 4, frequency and phase detection module 9, primary state quantity detection sensor 3, secondary state quantity detection sensor 3', primary communication module 12, secondary communication module 12' , rectifier 6, load 7 and drive circuit 13, etc.

The positive and negative terminals of the DC power supply 1 are respectively connected to the DC input terminals of the inverter frequency multiplication circuit 2, and the inverter frequency multiplication circuit 2 outputs a single-phase high-frequency voltage, which is connected to the two terminals of the primary resonant capacitor 5 in series or in parallel , the primary resonant capacitor 5 is connected in series or in parallel with the primary of the non-contact transformer 4, and a primary state quantity detection sensor 3 is provided between the output terminal of the inverter frequency multiplication circuit 2 and the primary resonant capacitor 5, and the primary state quantity detection sensor 3 Including voltage sensor, current sensor, temperature sensor, air gap sensor and position sensor, etc., respectively detect the output voltage and output current of the frequency multiplication circuit of the inverter, the temperature of the frequency multiplication circuit of the inverter, and the primary and secondary temperature of the non-contact transformer. Air gap and relative position between primary and secondary. The secondary of the non-contact transformer 4 is connected to the input terminal of the rectifier 6 through the two output terminals connected in series or in parallel with the secondary resonant capacitor 5', and the output of the rectifier 6 is connected to the positive and negative poles of the load 7, between the rectifier 6 and A secondary state quantity sensor 3' is arranged between the loads 7 . The secondary state quantity sensor 3' comprises a voltage sensor and a current sensor, and the voltage sensor and the current sensor respectively detect the voltage and current output by the rectifier. After the inverter output voltage and current signal detected by the primary state quantity detection sensor 3 enters the frequency and phase detection module 9, the frequency and phase detection module 9 will obtain the frequency signal of the inverter output current and the inverter output voltage and The phase difference signal between the inverter output currents is sent to the main controller 8 . All the signals detected by the primary state quantity detection sensor 3 are sent to the main controller 8 . The secondary state quantity detection sensor 3' sends the voltage and current signal output by the rectifier 6 to the secondary controller 11, and the secondary controller 11 sends it to the primary communication module 12 through the secondary communication module 12', and the primary communication module 12 sends the signal to the primary communication module 12. The signal is passed to the master controller 8. The main controller 8 synthesizes the signals of the primary state quantity detection sensor 3 and the secondary state quantity detection sensor 3', sends out the driving pulse of the inverter frequency multiplication circuit 2, and sends it to the driving circuit 13 after the dead zone control, and the driving circuit 13 is connected to To the respective switching device drive terminals of the frequency multiplying circuit 2 of the inverter. One side of the primary capacitance compensation regulator 10 is connected to the main controller 8 , and the other side is connected to the primary resonant capacitor 5 . One side of the secondary capacitance compensation regulator 10' is connected to the secondary controller 11, and the other side is connected to the secondary resonant capacitor 5'.

The DC power source 1 may be a DC source obtained by rectifying an AC power source, or may be a DC source such as a storage battery or a capacitor. The DC power supply can be a voltage source or a current source, respectively corresponding to the frequency multiplication circuit of the voltage type inverter and the frequency multiplication circuit of the current type inverter. The structure of the present invention will be described below by taking the frequency multiplication circuit of the voltage type inverter as an example. .

The inverter frequency multiplication circuit 2 is composed of n sets of inverter units connected in parallel, and when k sets of inverter units 2' are selected from n sets of inverter units 2' for time-sharing driving, the output of the inverter frequency multiplication circuit 2 The voltage frequency is k times the output voltage frequency of the inverter unit (2'), forming a k-multiple frequency inverter, n is an integer not less than 1, and k is an integer not less than 1 and not greater than n. For voltage type inverter frequency multiplication circuit, described k frequency multiplication inverter refers to that the output voltage frequency of inverter frequency multiplication circuit is k times of inverter unit output voltage frequency; frequency circuit, the k-multiplier inverter refers to the frequency of the output current of the inverter frequency multiplication circuit is k times the frequency of the output current of the inverter unit, and k is an integer not less than 1. The frequency multiplier circuit of the voltage source inverter is taken as an example below. The frequency multiplication circuit 2 of the inverter can be a single-phase output or a multi-phase output.

The inverter unit 2' can be a known full-bridge topology, or a known half-bridge topology, or other DC-to-AC topology. Each switch group in each inverter unit can be a single device, or a series or parallel connection of multiple devices. The power device in the frequency multiplication circuit of the inverter can be a full-control device such as MOSFET, IGBT, IGCT, etc., and the device can have an anti-parallel freewheeling diode, or an antiparallel freewheeling diode can be added.

The primary state quantity detection sensor 3 includes detecting the output voltage of the inverter frequency doubling circuit 2, the output current of the inverter frequency doubling circuit 2, the temperature of the inverter frequency doubling circuit 2, the contactless transformer 4 between the primary and the secondary Sensors for detection of state quantities such as air gap and relative position. The output voltage sensor of the inverter frequency multiplication circuit 2 is respectively connected to the two output terminals of the inverter frequency multiplication circuit 2; the output current sensor of the inverter frequency multiplication circuit is connected in series to one output line of the inverter frequency multiplication circuit The temperature sensor of the frequency doubling circuit of the inverter is embedded in the heat sink of the frequency doubling circuit of the inverter 2; the air gap between the primary and secondary of the non-contact transformer 4 and the relative position sensor are respectively arranged in the primary and secondary of the non-contact transformer middle. The output signal of the primary state quantity detection sensor is sent to the main controller, and the voltage and current output signals are sent to the frequency and phase detection module. The secondary state quantity detection sensor 3' includes a contactless transformer secondary side rectifier output voltage and an output current sensor, the output voltage sensor is respectively connected to the two terminals of the rectifier output, and the output current sensor is connected in series to one of the output lines. The output signal of the secondary state quantity detection sensor 3' is sent to the secondary controller 11.

The non-contact transformer 4 is composed of a primary winding, a secondary winding and structural components, and there is a certain air gap between the primary winding and the secondary winding.

The primary resonant capacitor 5 and the secondary resonant capacitor 5' can be composed of a single or multiple capacitors; the primary resonant capacitor 5 can be connected in series, in parallel or in parallel with the primary winding, and the secondary resonant capacitor 5' can be connected with the secondary The windings are connected in series, parallel or series-parallel.

The rectifier 6 may be composed of an uncontrolled rectifier bridge and a filter capacitor, or may be a controllable rectifier or other topologies that convert AC to DC. The output of the rectifier can be a DC voltage source or a DC current source.

The load 7 may be an actual DC load, or it may be supplied to the load after passing through other electric energy conversion links, that is, an equivalent load.

The main controller 8 is also connected to the driving circuit of the frequency multiplication circuit 2 of the inverter in addition to the related connection methods mentioned above. The main controller 8 performs judgment processing according to the signals sent by the primary state quantity detection sensor 3 and the secondary state quantity detection sensor 3', and obtains the air gap between the primary and secondary stages of the transformer, the relative position between the primary and secondary stages, and the load status, etc. Determine the frequency that the inverter frequency multiplier circuit 2' should output, which can be changed from the single multiplier frequency and its vicinity to the n multiplier frequency and its vicinity; determine the duty cycle of the inverter unit 2' output voltage, to Adjust the output power; determine the phase difference between the output voltage and the output current of the frequency multiplication circuit 2 of the inverter, to adjust the phase between the output voltage and the output current of the frequency multiplication circuit 2 of the inverter, and finally adjust the frequency of the driving pulse comprehensively, The duty cycle and phase are sent to the driving circuit 13 after being controlled by the dead zone, and the driving circuit 13 is connected to the driving terminal of each switching device of the frequency multiplication circuit 2 of the inverter. In order to make the whole system work at a higher efficiency, the main controller 8 also needs to decide to issue instructions to the primary capacitor compensation regulator 10 and the secondary capacitor compensation regulator 10' according to the output frequency of the inverter frequency multiplier circuit 2 to adjust the primary The capacitance of the resonant capacitor 5 and the secondary resonant capacitor 5' is matched with the inductance and frequency parameters. The main controller 8 selects k sets from n sets of inverter units 2' according to the output frequency requirements of the frequency multiplication circuit of the inverter, and drives the inverter units 2' of the corresponding inverter in time-sharing, and each inverter unit 2' The working frequency is the same, the duty cycle of the driving pulse of the switching group in each inverter unit is less than or equal to 1/(2k), and the switching cycle is 1/k in sequence, and the driving pulse of each inverter unit lags behind by 360/k degrees; k times The output voltage frequency of the frequency inverter frequency multiplication circuit is k times the output voltage frequency of each inverter unit 2', wherein n is an integer not less than 1, and k is an integer not less than and not greater than n.

The frequency and phase detection module 9 calculates the frequency of the output current of the inverter frequency multiplication circuit and the output frequency of the inverter frequency multiplication circuit according to the output voltage and output current of the inverter frequency multiplication circuit obtained by the primary state quantity detection sensor 3 The phase difference of the voltage and the output current is sent to the main controller 8 to realize the closed-loop control of the frequency and the phase difference.

One side of the primary capacitance compensation regulator 10 is connected to the main controller 8 , and the other side is connected to the primary resonance capacitor 5 . One side of the secondary capacitance compensation regulator 10' is connected to the secondary controller 11, and the other side is connected to the secondary resonant capacitor 5'. The primary capacitance compensation regulator 10 and the secondary capacitance compensation regulator 10' adjust the capacitance of the connected primary resonant capacitor 5 and the secondary resonant capacitor 5' according to the instructions of the main controller 8 and the secondary controller 11 respectively , to ensure that the capacitance, inductance and frequency parameters in the power supply unit match.

The secondary controller 11 receives the signal from the secondary state quantity detection sensor 3', and the secondary controller 11 is connected with the secondary communication module 12' to communicate with the primary communication module 12.

The primary communication module 12 can be connected with the main controller 8 through RS232, RS422, RS485, CAN, Ethernet and the like. The secondary communication module 12' can be connected with the secondary controller 11 through RS232, RS422, RS485, CAN, Ethernet, etc., and the primary communication module and the secondary communication module can be connected through radio frequency, infrared, RS232, RS422, RS485 , CAN, Ethernet, etc. for wireless or wired communication.

After the drive circuit 13 processes the drive pulse signal sent by the inverter frequency multiplication circuit, the output of the drive circuit is connected to each switching device drive terminal of the inverter frequency multiplication circuit to drive the inverter frequency multiplication circuit. individual switching devices.

The inverter frequency doubling circuit 2 of the frequency doubling high-frequency inverter power supply of the full-bridge inverter type wireless power transmission device shown in Figure 1 is composed of n sets of full-bridge inverter units, and each set of full-bridge inverter units Consists of 4 switch groups. The switch groups S1_1, S1_2, S1_3 and S1_4 constitute the first inverter unit 2' of the inverter, the switch groups S2_1, S2_2, S2_3 and S2_4 constitute the second inverter unit 2' of the inverter, and so on, the switch group Sn_1, Sn_2, Sn_3 and Sn_4 constitute the nth set of inverter unit 2' of the inverter. The n-multiple frequency operation mode is as follows: n sets of inverter units 2' time-sharing action, each set of inverter units 2' has the same operating frequency, and the duty cycle of the switch group drive pulse in each set of inverter units 2' is less than or equal to 1 /(2n), work in turn for 1/n switching cycle, the driving pulse of each inverter unit lags behind 360/n degrees in turn; the output voltage frequency of the frequency multiplication circuit of the n-multiplier inverter is the output voltage frequency of each inverter unit 2' n times of , that is, an n-multiple frequency inverter, where n is an integer not less than 1.

The n sets of inverter units 2' of the inverter frequency multiplication circuit 2 can be time-divisionally driven to form an n frequency multiplication inverter, and k sets of inverter units 2' can also be selected to form a k frequency multiplication inverter. Inverter, wherein k is an integer not less than 1 and not greater than n, so that the output voltage frequency of the inverter frequency multiplication circuit 2 can vary from 1 to n times the output voltage frequency range of the inverter unit.

As the output frequency of the inverter frequency multiplier circuit 2 changes, the main controller 8 sends instructions to the primary capacitance compensation regulator 10 and the secondary capacitance compensation regulator 10' to adjust the electric current of the primary resonance capacitor 5 and the secondary resonance capacitor 5'. Capacity, to match the inductance and frequency parameters, so as to maintain the high efficiency of energy transfer.

The inverter frequency multiplication circuit 2 adjusts the output power of the inverter frequency multiplication circuit by adjusting the phase difference of the driving frequency of the diagonal switch group of the inverter unit. It is also possible to make the driving pulses of the diagonal switch groups of the inverter unit consistent, and adjust the duty ratio of the driving pulses to adjust the output power of the frequency multiplication circuit of the inverter.

Fig. 2 shows the second embodiment of the present invention: half-bridge frequency multiplication type high-frequency inverter power supply and its frequency multiplication control method, its basic composition and connection method are the same as the implementation except the inverter unit 2' and the corresponding power adjustment method Example 1 is the same.

The half-bridge inverter frequency multiplication circuit 2 shown in Figure 2 is composed of n sets of half-bridge inverter units 2', capacitors connected in series and voltage equalizing resistors connected in series, and each set of half-bridge inverter units consists of 2 The switch group is composed, and the connection method is shown in Figure 2. The first switch group S1_1 and S1_2 constitute the first set of inverter unit 2', the second switch group S2_1 and S2_2 constitute the second set of inverter unit 2', and so on, the nth switch group Sn_1 and Sn_2 constitute the nth set of inverter Unit 2'. The n-multiple frequency operation mode is as follows: the duty cycle of the driving pulse of the switching group in each inverter unit is less than or equal to 1/(2n), and it works sequentially for 1/n switching period, and the driving pulse of each inverter unit lags behind by 360/n degrees in turn The frequency of the output voltage of the n-multiple frequency inverter frequency multiplication circuit is n times the output voltage frequency of each inverter unit 2', forming an n-multiple frequency inverter, where n is an integer not less than 1.

Same as the first embodiment, the output voltage frequency of the inverter frequency multiplication circuit 2 of the second embodiment can vary from 1 to n times the output voltage frequency range of the inverter unit 2'. As the frequency of the output voltage of the inverter frequency multiplier circuit 2 changes, the main controller 8 issues instructions to the primary capacitance compensation regulator 10 and the secondary capacitance compensation regulator 10' to adjust the primary resonance capacitor 5 and the secondary resonance capacitor 5'. Capacitance, to match the inductance and frequency parameters, so as to maintain the high efficiency of energy transfer.

The drive pulses of the diagonal switch groups of each inverter unit 2' of the half-bridge inverter frequency multiplier circuit 2 are consistent, and the output power of the inverter frequency multiplier circuit 2 is adjusted by adjusting the duty ratio of the drive pulses.

Taking Embodiment 1 and Embodiment 2 as objects, the frequency multiplication control method of the frequency multiplication circuit 2 of the triple frequency and n-multiplication inverters is introduced.

According to Embodiment 1, the frequency multiplication circuit of the triple frequency inverter can operate in triple frequency mode, double frequency mode or single frequency mode, and the corresponding control method is as follows.

Triple frequency mode, triple frequency inverter frequency multiplication circuit is composed of three sets of inverter units 2'. The duty cycle of the driving pulse of each switch group is less than or equal to 1/6, and it works sequentially for 1/3 switching period; the driving pulse without dead zone control and the output waveform of the inverter frequency multiplication circuit 2 are shown in Figure 3, where P14a and P23a are the drive pulses of the first set of inverter unit 2', P14b and P23b are the drive pulses of the second set of inverter unit 2', P14c and P23c are the drive pulses of the third set of inverter unit 2', each switch The group drive pulses are sequentially delayed by 120 degrees. The output voltage frequency of the triple frequency inverter is 3 times of the output voltage frequency of a single set of inverter unit 2'. (1) For the full-bridge inverter unit 2', P14a is the driving pulse of the first switch S1_1 of the first switch group and the fourth switch S1_4 of the first switch group in the first set of inverter unit 2'; P23a is The driving pulse of the second switch S1_2 of the first switch group in the first set of inverter unit 2' and the third switch S1_3 of the first switch group; P14b is the second switch group in the second set of inverter unit 2' P23b is the driving pulse of the first switch S2_1 of the second switch group and the fourth switch S2_4 of the second switch group; P23b is the second switch S22 of the second switch group in the second set of inverter unit 2' and the third The drive pulse of switch S2_3; P14c is the drive pulse of the first switch S3_1 and the fourth switch S3_4 of the third switch group in the third set of inverter unit 2'; P23c is the drive pulse of the third switch group in the third set of inverter unit 2'. The driving pulses of the second switch S32 and the third switch S3_3 of the third switch group; Up is the output voltage waveform of the frequency multiplication circuit 2 of the inverter. (2) For the half-bridge inverter unit 2', P14a is the driving pulse of the first switch S1_1 of the first switch group in the first set of inverter unit 2'; P23a is the first switch in the first set of inverter unit 2' The driving pulse of the second switch S1_2 in the group; P14b is the driving pulse of S2_1 in the first switch of the second switch group of the second set of inverter unit 2'; P23b is the second switch S2_2 of the second switch group in the second set of inverter unit 2' P14c is the driving pulse of the first switch S3_1 of the third switch group in the third set of inverter unit 2'; P23c is the driving pulse of the second switch S3_2 of the third switch group in the third set of inverter unit 2'; Up is the output voltage waveform of the frequency multiplication circuit 2 of the inverter. It can be seen that the output voltage frequency of the frequency multiplication circuit 2 of the triple frequency inverter is three times that of the output voltage frequency of a single set of inverter unit 2'.

In the double frequency mode, two sets are randomly selected from three sets of inverter units 2', for example, the first set and the second set of inverter units are selected for operation. The duty cycle of the driving pulse of each switch group is less than or equal to 1/4, and it works sequentially for 1/2 switching period; the driving pulse without dead zone control and the output waveform of the frequency multiplication circuit of the inverter are shown in Figure 4, where P14a and P23a are the driving pulses of the first set of inverter unit 2', P14b and P23b are the driving pulses of the second set of inverter unit 2', lagging behind the driving pulse of the first set of inverter unit 2' by 180 degrees. The output voltage frequency of the double frequency inverter frequency multiplier circuit is twice the output voltage frequency of a single set of inverter unit 2'. (1) For the full-bridge inverter unit, P14a is the driving pulse of the first switch S1_1 and the fourth switch S1_4 of the first switch group in the first set of inverter unit 2' of the inverter; P23a is the driving pulse of the first set of inverter The driving pulse of the second switch S1_2 and the third switch S1_3 of the first switch group in the inverter unit 2'; P14b is the first switch S2_1 and the fourth switch S2_4 of the second switch group in the second set of inverter unit 2' P23b is the driving pulse of the second switch S2_2 and the third switch S2_3 of the second switch group in the second set of inverter unit 2'; Up is the output voltage waveform of the frequency multiplication circuit 2 of the inverter. (2) For the half-bridge inverter unit 2', P14a is the driving pulse of the first switch S1_1 of the first switch group in the first set of inverter unit 2'; P23a is the driving pulse of the first switch S1_1 in the first set of inverter unit 2'. The drive pulse of the second switch S1_2 of the first switch group; P14b is the drive pulse of the first switch S2_1 of the second switch group in the second set of inverter unit 2'; P23b is the drive pulse of the second switch group in the second set of inverter unit 2' The driving pulse of the second switch S2_2 of the second switch group; Up is the output voltage waveform of the frequency multiplication circuit 2 of the inverter. It can be seen that the output voltage frequency of the double-frequency inverter frequency multiplication circuit 2 is twice that of the output voltage frequency of each set of running inverter units 2'.

In the single multiplier mode, one of the three sets of inverter units 2' is randomly selected to operate, for example, the first set of inverter units is selected to operate. The driving pulse duty cycle of each switch group is less than or equal to 1/2, the driving pulse without dead zone control and the output waveform of the inverter frequency multiplication circuit are shown in Figure 5, where P14a and P23a are the first set of inverter Unit 2' drive pulse. (1) For the full-bridge inverter unit, P14a is the driving pulse of the first switch S1_1 and the fourth switch S1_4 of the first switch group in the first set of inverter unit 2' of the inverter; P23a is the driving pulse of the first set of inverter The driving pulses of the second switch S1_2 and the third switch S1_3 of the first switch group in the switching unit 2'. (2) For the half-bridge inverter unit 2', P14a is the driving pulse of the first switch S1_1 of the first switch group in the first set of inverter unit 2'; P23a is the driving pulse of the first switch S1_1 in the first set of inverter unit 2'. The driving pulse of the second switch group S1_2 of the first switch group; Up is the output voltage waveform of the frequency multiplication circuit 2 of the inverter. In the independent operation mode of the inverter unit, the output voltage frequency of the inverter frequency multiplication circuit 2 is the same as the output voltage frequency of the running inverter unit 2'.

According to the above introduction, it is easy to deduce the control method of the k-multiplier mode of the n-multiplier inverter frequency multiplier circuit 2 as follows:

k frequency multiplication mode: randomly select k sets of operation from n sets of inverter units 2'. The duty ratio of the driving pulses of the switching groups in each set of inverter units 2' is less than or equal to 1/(2k), and the switching cycles are sequentially operated for 1/k, and the driving pulses of each inverter unit 2' are sequentially delayed by 360/k degrees. The output voltage frequency of the inverter frequency multiplication circuit 2 under the k-multiplication operation mode is k times of the output voltage frequency of the inverter unit 2' of each set of operation, and k is an integer not less than 1 and not greater than n.

For the frequency multiplication circuit of the full-bridge inverter, the frequency multiplication control method introduced in the above embodiments does not apply the full-bridge phase-shift control. When the full-bridge phase-shift control is used, the driving pulses of the diagonal switch groups of each inverter unit exist A certain phase difference to adjust the output power. For example, in the n-multiple frequency full-bridge inverter frequency multiplication circuit, in the kth inverter unit 2', the driving pulse of Sk_4 lags behind the driving pulse of Sk_1 by a certain phase angle, and the driving pulse of Sk_2 lags behind the driving pulse of Sk_3 by the same phase angle, n is an integer not less than 1, and k is an integer not less than 1 and not greater than n.

Claims (5)

1. A high-frequency inverter power supply of a wireless energy transmission device, the high-frequency inverter power supply comprising: a DC power supply (1), an inverter frequency multiplication circuit (2), a main controller (8), a secondary Controller (11), primary resonance capacitor (5), secondary resonance capacitor (5'), primary capacitance compensation regulator (10), secondary capacitance compensation regulator (10'), non-contact transformer (4), frequency And phase detection module (9), primary state quantity detection sensor (3), secondary state quantity detection sensor (3'), primary communication module (12), secondary communication module (12'), rectifier (6), load (7) and drive circuit (13); described DC power supply (1) connects the DC input end of inverter frequency multiplication circuit (2), and inverter frequency multiplication circuit (2) links to each other with primary resonant capacitor (5) The primary resonant capacitor (5) is connected to the primary of the non-contact transformer (4); the primary state quantity detection sensor (3) is provided between the output terminal of the inverter frequency multiplication circuit (2) and the primary resonant capacitor (5) ; The secondary of the non-contact transformer (4) is connected to the input terminal of the rectifier (6) after being connected with the secondary resonant capacitor (5 '), and the output of the rectifier (6) is connected to the load (7); between the rectifier (6) and A secondary state quantity detection sensor (3') is arranged between the loads (7); the output voltage of the inverter frequency multiplication circuit (2) detected by the primary state quantity detection sensor (3) and the inverter frequency multiplication circuit (2 ) output current signal enters the frequency and phase detection module (9), and the frequency and phase detection module (9) sends the frequency signal of the inverter output current and the phase difference signal between the inverter output voltage and the inverter output current to the main controller (8); all signals detected by the primary state quantity detection sensor (3) are sent to the main controller (8); the secondary state quantity detection sensor (3') outputs the voltage of the rectifier (6) and the rectifier (6) The output current signal is sent to the secondary controller (11), and the secondary controller (11) sends the voltage and current signals to the primary communication module (12) through the secondary communication module (12'), and the primary The communication module (12) transmits the described voltage and current signals to the main controller (8); signal, send the drive pulse signal of the inverter frequency multiplication circuit (2) to the drive circuit (13), and the drive circuit (13) is connected to each switching device drive terminal of the inverter frequency multiplication circuit (2); primary capacitance compensation One side of the regulator (10) is connected with the main controller (8), and the other side is connected with the primary resonant capacitor (5); one side of the secondary capacitance compensation regulator (10') is connected with the secondary controller 11, and the other side is connected with the primary resonant capacitor (5). One side is connected with the secondary resonant capacitor (5'); the inverter frequency multiplication circuit (2) is composed of n sets of inverter units (2') connected in parallel, and n sets of inverter units (2') are time-sharingly driven , the output voltage frequency or current frequency of the inverter frequency multiplication circuit (2) is n times the output voltage frequency or current frequency of the inverter unit (2'), forming an n times frequency Inverter; wherein, n is an integer not less than 1; when the k sets of inverter units (2') in the n sets of inverter units (2') are time-sharing driven, the inverter frequency multiplication circuit (2 ) whose output voltage frequency or current frequency is k times the output voltage frequency or current frequency of the inverter unit (2'), forming a k-multiple frequency inverter, wherein n is an integer not less than 1, k is not less than 1 and An integer not greater than n; it is characterized in that the duty ratio of the driving pulse and the phase between the driving pulses are adjusted by the main controller (8), and the driving pulse signal is sent to the driving circuit (13) after being controlled by the dead zone. The driving circuit (13) time-sharing drives n sets of inverter units (2') in the inverter frequency multiplication circuit (2) to act in time-sharing, and the operating frequency of each set of inverter units (2') is the same, and each set of inverter units (2') has the same operating frequency. The switch group driving pulse duty ratio in the variable unit (2') is less than or equal to 1/(2n), and it works sequentially for 1/n switching cycle, and the driving pulses of each inverter unit lag behind by 360/n degrees in turn; n multiplied frequency inverter The output voltage frequency or current frequency of the inverter frequency multiplication circuit is n times the output voltage frequency or current frequency of each inverter unit (2'), realizing an n-multiplication frequency inverter, and n is an integer not less than 1. 2. the frequency multiplication control method of high-frequency inverter power supply according to claim 1, is characterized in that, when driving circuit (13) time-sharing drives the k cover inverter unit ( 2') during action, the output voltage frequency or current frequency of the inverter frequency multiplier circuit is k times of the inverter unit (2') output voltage frequency or current frequency, forming a k frequency multiplier inverter, and k is An integer not less than 1 and not greater than n, n is the number of inverter units (2'), and n is an integer not less than 1. 3. according to the frequency multiplication control method of claim 1 or 2 described high-frequency inverter power supply, it is characterized in that, every set of described inverter units (2') of the k frequency multiplication inverter The duty cycle of the driving pulse of the switch group is less than or equal to 1/(2k), and it works sequentially for 1/k switching period, and the driving pulse of each inverter unit (2') lags behind 360/k degrees in turn; k frequency multiplication inverter frequency multiplication circuit The output voltage frequency or current frequency is k times the output voltage frequency or current frequency of each inverter unit (2'), k is an integer not less than 1 and not greater than n, and n is the number of inverter units (2') number, n is an integer not less than 1. 4. The frequency multiplication control method of the high-frequency inverter power supply according to claim 1 or 2, characterized in that, the inverter frequency multiplication circuit (2) drives pulses by adjusting the diagonal switch group of the inverter unit Adjust the output power of the frequency multiplier circuit of the inverter; or make the driving pulses of the diagonal switch groups of the inverter unit consistent, and adjust the duty cycle of the driving pulses of the diagonal switch groups of the inverter unit to adjust the frequency of the inverter. The output power of the frequency circuit. 5. The frequency multiplication control method of the high frequency inverter power supply according to claim 1 or 2, characterized in that, for the voltage type inverter frequency multiplication circuit (2), the k frequency multiplication inverter refers to The output voltage frequency of the inverter frequency multiplication circuit (2) is k times the output voltage frequency of the inverter unit (2'); for the current-type inverter frequency multiplication circuit (2), the k multiplication frequency inverter The inverter means that the frequency of the output current of the frequency multiplication circuit (2) of the inverter is k times the frequency of the output current of the inverter unit (2'), and k is an integer not less than 1.