CN108063500B - Magnetic resonance non-contact power supply system and method for on-line monitoring wireless sensor - Google Patents
Magnetic resonance non-contact power supply system and method for on-line monitoring wireless sensor Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H02J13/0075—
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- H02J7/025—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
- H02M7/2195—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration the switches being synchronously commutated at the same frequency of the AC input voltage
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Abstract
The invention belongs to the technical field of electrical equipment, and discloses a magnetic resonance non-contact power supply system and a method for on-line monitoring of a wireless sensor, wherein the non-contact power supply system comprises a magnetic resonance non-contact power supply MR-CPS, is used for non-contact transmitting and receiving electric energy in a magnetic resonance mode, provides a working power supply for the wireless sensor, and embeds feedback control of the magnetic resonance non-contact power supply into the wireless sensor; the wireless sensor is used for monitoring the state quantity of the electrical equipment on line and transmitting the state data of the electrical equipment to the upper computer in a wireless mode; a method for automatically seeking a critical input power value of the output voltage stabilization of the Buck circuit is also disclosed. The invention can meet the power supply requirement of the wireless sensor arranged on the high-voltage side of the electrical equipment, and simultaneously embeds the feedback control of the MR-CPS into the wireless sensor, thereby reducing the system cost, leading the energy transmission to have self-adaptive controllability and effectively improving the self-adaptability of the system to the environment.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a magnetic resonance non-contact power supply system and method for an on-line monitoring wireless sensor. The method is applied to electrical equipment.
Background
The sensor for transmitting data in a wireless mode (called wireless sensor for short) has the advantages of no wiring, convenience, flexibility and the like, and has become an important online monitoring mode for high-voltage electrical equipment. The wireless sensor needs a working power supply, but due to the high voltage of the high-voltage electric equipment and the electrical insulation safety requirement, the wireless sensor is difficult to directly take electricity from the high-voltage electric equipment and difficult to directly supply power by low-voltage side commercial power, so the working power supply becomes a key technology for limiting the further application and development of the working power supply.
The power supply modes for the on-line monitoring sensor of the high-voltage electric equipment which are researched and adopted at present mainly comprise the following steps: lithium batteries, photovoltaic cells, lasers, piezoelectric or thermoelectric energy collection, electric field energy collection, current transformer electricity extraction and the like. Lithium batteries are the simplest power supply mode, but have limited battery capacity and high temperature difference resistance, and the batteries need to be replaced by frequent power failure during long-term operation. Photovoltaic cells require outdoor use and rely on illumination. The laser is stable in power supply and free from electromagnetic interference, but has low photoelectric conversion efficiency, high cost and short service life. Piezoelectric or thermoelectric energy collection modes adopt piezoelectric or thermoelectric effect to collect energy, the collected energy is limited, and the energy is influenced by bus current and the like, so that the problems of dead zone of power supply and the like exist. The electric energy collected by the electric field energy collection mode depends on the voltage grade and the area of the electrode plate, the collected energy is limited, and the problems that design is difficult, stray capacitance has a large influence on electricity taking performance and the like exist. The current transformer is powered by sleeving a coil with a magnetic core on a high-voltage bus through a sleeve, and is powered by an alternating magnetic field generated by bus current, so that the current transformer has wide application, but has the defects that when the bus current is small, the power is not enough, the bus is short-circuited, and the like, the sensor is easy to interfere, even damage, and the like due to overcurrent; in addition, for existing high-voltage electrical equipment with large stock, particularly for a switch cabinet with compact structure, the current transformer is directly sleeved on the high-voltage bus bar to damage electrical insulation, and key components of the high-voltage electrical equipment need to be modified, so that the current transformer is not economically feasible to take electricity.
When the non-contact electric energy transmission technology transmits electric energy, electric connection does not exist between the electric energy transmitting and receiving units, wherein the magnetic resonance non-contact electric energy transmission technology can transmit electric energy more efficiently at a longer distance, and is widely studied in electric vehicle chargers and consumer electronic equipment, but is rarely studied and applied in the field of electric power high voltage. When the non-contact electric energy transmission technology transmits electric energy, the electric energy transmitting and receiving units are not electrically connected, so that the electric energy can be transmitted in a non-contact way at a certain distance, and the electric insulation requirement of high-voltage electric equipment is met. Therefore, the invention provides a magnetic resonance non-contact power supply (MR-CPS for short) which adopts a non-contact power transmission technology to supply power to the on-line monitoring sensor of the high-voltage electric equipment, in particular to the application occasion of the high-voltage switch cabinet. Compared with an outdoor high-voltage overhead line, the high-voltage switch cabinet is compact in structure, more in metal parts, more in electromagnetic environment, temperature environment, installation requirements and the like, so that the MR-CPS working environment is more severe, and the technical difficulty is higher.
In summary, the problems of the prior art are:
the existing power supply scheme of the high-voltage electric equipment on-line monitoring wireless sensor can not well meet the electrical insulation requirement of the high-voltage electric equipment, and can provide long-term stable and sufficient electric energy.
For MR-CPS of magnetic resonance non-contact power supply, because the MR-CPS has the influence of possible drift of coil resonance frequency, metal object around, deviation of installation position, etc. in practical application, it is necessary to increase the input power of the energy transmitting module to ensure the stable output voltage, but this way is unfavorable for energy saving, and the larger power loss also causes serious system heating, difficult heat dissipation, and affects the stability and reliability of system operation. Therefore, the self-adaptive feedback control is necessary, so that the energy transmission is controllable, the self-adaptability of complex field application is ensured, the energy waste is avoided, and the system stability and reliability are improved.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a magnetic resonance non-contact power supply system and a method for on-line monitoring of a wireless sensor. The invention can provide a long-term stable and sufficient working power supply for the wireless sensor arranged on the high-voltage side of the high-voltage electric equipment, meets the high-voltage insulation requirement of the electric equipment, and can effectively improve the self-adaptability of the system to the environment so as to ensure long-term, stable and reliable operation of the system.
The invention is realized by a method for automatically searching a critical input power value of output voltage stabilization of a Buck circuit, which comprises the following steps:
when starting up, the input power P of the high-frequency power amplifying circuit is reduced or increased continuously with a certain step length in_Amf By judging whether the output voltage of the Buck circuit is stable or not, the critical input voltage V corresponding to the critical output voltage stabilization of the Buck circuit is found in_Buck_L Corresponding critical input power P in_Amf_L The method comprises the steps of carrying out a first treatment on the surface of the Then adding a certain step margin of input power P in_Amf The Buck circuit outputs stable voltage, and the input voltage V of the Buck circuit at the moment is recorded in_Buck_F ；
When the Buck circuit inputs voltage V due to external reasons in_Buck Exceeding V in_Buck_F At one volt, the input power P is reduced adaptively in_Amf Re-execution to find the new threshold voltage V in_Buck_L And P in_Amf_L ；
When V is caused by external reasons in_Buck Below V in_Buck_L When the input power P is adaptively increased in_Amf Re-execution to find the new threshold voltage V in_Buck_L And P in_Amf_L ；
Otherwise, the input power is kept unchanged.
Another object of the present invention is to provide a magnetic resonance non-contact power supply system for on-line monitoring of a wireless sensor, which is applied to an electrical device, and includes:
the magnetic resonance non-contact power supply (MR-CPS for short) is used for non-contact transmitting and receiving electric energy in a magnetic resonance mode, providing a working power supply for the wireless sensor, and embedding feedback control of the MR-CPS of the magnetic resonance non-contact power supply into the wireless sensor;
and the wireless sensor is used for monitoring the operation state quantity of the electrical equipment on line and transmitting the operation state data of the high-voltage side of the electrical equipment to the upper computer in a wireless mode.
Further, the magnetic resonance noncontact power supply MR-CPS includes a transmitting power side and a receiving side; the transmitting power side comprises an AC/DC voltage stabilizing module, a high-frequency power amplifying module and an energy transmitting module;
the AC/DC voltage stabilizing module adopts a flyback circuit;
the high-frequency power amplifying module adopts an E-class high-frequency switch power amplifying circuit;
the receiving side comprises an energy receiving module and a rectifying and voltage stabilizing module;
the rectifying and voltage stabilizing module adopts a full-bridge rectifying and Buck voltage stabilizing circuit;
the energy transmitting module and the energy receiving module form a magnetic resonance non-contact electric energy transmission unit.
Further, the wireless sensor comprises a sensor, a singlechip, a wireless communication module and an upper computer; the wireless communication module adopts a ZigBee module for communication.
Further, the magnetic resonance non-contact power supply MR-CPS utilizes the commercial power to generate direct current through a flyback circuit as the input of an E-type high-frequency switching power amplifying circuit, the E-type high-frequency switching power amplifying circuit generates MHz sinusoidal alternating current as the excitation source of an energy transmitting module, and an energy receiving module receives corresponding energy and supplies power to a wireless sensor through a rectifying and voltage stabilizing Buck circuit;
the wireless sensor transmits the collected running state quantity of the high-voltage electric equipment to the upper computer, and also transmits the output voltage information of the voltage stabilizing Buck circuit to the transmitting side.
Further, the self-adaptive feedback control comprises output voltage information acquisition of a voltage stabilizing Buck circuit, wireless communication between a transmitting side and a receiving side and control of energy of the transmitting side;
in the case of the feedback control described above,
when the input voltage of the Buck circuit is smaller than the output voltage stabilizing value, the output cannot be stabilized;
when the input voltage of the Buck circuit is larger than the output voltage stabilizing value, the input power is constant, and the output voltage is stabilized;
when the load resistance of the Buck voltage-stabilizing circuit is constant, the output voltage of the Buck voltage-stabilizing circuit has a critical input power value along with the change of the input power of the high-frequency power amplifying circuit, so that the output of the Buck circuit can be stabilized; when the input power is lower than the critical input power value, the output cannot be stabilized; when the input power is higher than the critical input power value, the output voltage is stabilized.
The invention has the advantages and positive effects that:
the invention can provide a long-term stable and sufficient working power supply for the wireless sensor arranged on the high-voltage side of the high-voltage electrical equipment, and can meet the high-voltage insulation requirement of the electrical equipment. Compared with the existing common lithium battery power supply method, the MR-CPS has the advantages that the MR-CPS needs to be stopped, overhauled, replaced, and the like without a period of time, so that the utilization rate of the high-voltage electrical equipment is greatly improved, and the running cost is effectively saved.
The invention adopts self-adaptive feedback control, so that the MR-CPS can be well self-adaptive to complex environments, and is particularly suitable for high-voltage electrical equipment with complex electromagnetic environment, complex temperature environment and more surrounding metals, such as a high-voltage switch cabinet; the requirement on the alignment precision of the energy transmitting and receiving modules during installation is reduced, so that the installation is easy, the electric energy transmission efficiency is effectively improved, and as in the prototype of the embodiment of the invention, the efficiency is improved by about 20% compared with open loop control when the transmission distance is 13cm, and the efficiency is improved by about 3% when the transmission distance is 18 cm.
The self-adaptive feedback control embedded wireless sensor of the invention, namely, the Zigbee module and the singlechip of the wireless sensor are shared, the singlechip and the wireless transmitting module of the wireless sensor are fully utilized as feedback control modules of MR-CPS, and the system cost is effectively reduced, and the cost can be reduced by about 15-20% in the model machine of the embodiment of the invention.
Drawings
Fig. 1 is a schematic diagram of a magnetic resonance non-contact power supply system of an on-line monitoring wireless sensor according to an embodiment of the present invention.
In the figure: 1. magnetic resonance non-contact power supply MR-CPS; 2. a wireless sensor.
Fig. 2 is a power circuit diagram of a magnetic resonance noncontact power supply MR-CPS provided by an embodiment of the present invention.
Fig. 3 is an input characteristic diagram of a Buck voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 4 is a graph showing a variation of the output voltage of the Buck circuit according to the input power of the high-frequency power amplifying circuit according to the embodiment of the present invention.
Fig. 5 is a flowchart of tracking critical voltage stability points according to an embodiment of the present invention.
Fig. 6 is a circuit diagram of a transmitting-side energy control according to an embodiment of the present invention.
FIG. 7 is a graph comparing the efficiency of open loop and closed loop control provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Because the MR-CPS of the magnetic resonance non-contact power supply has the influence that the resonance frequency of the coil may drift, metal objects exist around, the installation position is deviated and the like in practical application, the input power margin of the energy transmitting module needs to be increased to ensure the stable output energy, but the mode is unfavorable for energy conservation, and the larger power loss also causes serious system heating and difficult heat dissipation, thereby influencing the stability and the reliability of the system operation. Therefore, the self-adaptive feedback control is necessary, so that the energy transmission is controllable, the self-adaptability of complex field application is ensured, the energy waste is avoided, and the system stability and reliability are improved.
The principles of the invention will be further described with reference to the drawings and specific examples.
As shown in fig. 1 to 7, a magnetic resonance non-contact power supply system for an on-line monitoring wireless sensor provided by an embodiment of the present invention includes:
the magnetic resonance non-contact power supply MR-CPS 1 is used for non-contact transmitting and receiving electric energy in a magnetic resonance mode, providing a working power supply for the wireless sensor, and embedding feedback control of the magnetic resonance non-contact power supply MR-CPS into the wireless sensor;
and the wireless sensor 2 is used for monitoring the operation state quantity of the electrical equipment on line and transmitting the operation state data of the high-voltage side of the electrical equipment to the upper computer in a wireless mode.
The magnetic resonance non-contact power supply MR-CPS comprises a transmitting power side and a receiving side; the transmitting power side comprises an AC/DC voltage stabilizing module, a high-frequency power amplifying module and an energy transmitting module;
the AC/DC voltage stabilizing module adopts a flyback circuit;
the high-frequency power amplifying module adopts an E-class high-frequency switch power amplifying circuit;
the receiving side comprises an energy receiving module and a rectifying and voltage stabilizing module;
the rectifying and voltage stabilizing module adopts a full-bridge rectifying and Buck voltage stabilizing circuit;
the energy transmitting module and the energy receiving module form a magnetic resonance non-contact electric energy transmission unit.
The wireless sensor comprises a sensor, a singlechip, a wireless communication module and an upper computer; the wireless communication module adopts a ZigBee module for communication.
The magnetic resonance non-contact power supply MR-CPS utilizes commercial power to generate direct current through a flyback circuit as input of an E-class high-frequency switching power amplifying circuit, the E-class high-frequency switching power amplifying circuit generates MHz sinusoidal alternating current as an excitation source of an energy transmitting module, and an energy receiving module receives corresponding energy and supplies power to a wireless sensor through a rectifying and voltage stabilizing Buck circuit;
the wireless sensor transmits the collected operation state quantity, such as temperature, of the high-voltage electrical equipment to the upper computer, and also transmits the output voltage information of the voltage stabilizing Buck circuit to the transmitting side.
The self-adaptive feedback control comprises output voltage information acquisition of a voltage stabilizing Buck circuit, wireless communication between a transmitting side and a receiving side and control of energy of the transmitting side;
in the case of the feedback control described above,
when the input voltage of the Buck circuit is smaller than the output voltage stabilizing value, the output cannot be stabilized;
when the input voltage of the Buck circuit is larger than the output voltage stabilizing value, the input power is constant, and the output voltage is stabilized;
when the load resistance of the Buck voltage-stabilizing circuit is constant, the output voltage of the Buck voltage-stabilizing circuit has a critical input power value along with the change of the input power of the high-frequency power amplifying circuit, so that the output of the Buck circuit can be stabilized; when the input power is lower than the critical input power value, the output cannot be stabilized; when the input power is higher than the critical input power value, the output voltage is stabilized.
The principles of the invention will be further described with reference to the drawings and specific examples.
As shown in FIG. 2, the power circuit of the MR-CPS provided by the embodiment of the invention is characterized in that the commercial power generates direct current through the flyback circuit as the input of the E-class high-frequency switch power amplifying circuit, the E-class high-frequency switch power amplifying circuit generates MHz sinusoidal alternating current as the excitation source of the energy transmitting module, and the energy receiving module receives corresponding energy and supplies power to the wireless sensor through the rectifying and voltage-stabilizing Buck circuit. Wherein the energy transmitting and receiving module is composed of a corresponding compensation network and a transmitting and receiving coil. The wireless sensor transmits the collected running state quantity of the high-voltage electric equipment to the upper computer, and also transmits the output voltage information of the voltage stabilizing Buck circuit to the transmitting side. In fig. 2, the upper half is the MR-CPS transmit power side; the lower half is the MR-CPS receiving side, which is mounted at the high voltage part of the high voltage electrical apparatus for monitoring the operating state quantity of the high voltage electrical apparatus.
The working principle of the feedback control will be explained in detail below:
analysis of the voltage-stabilizing Buck converter circuit under ideal conditions shows that when the input voltage of the Buck circuit is smaller than the output voltage-stabilizing value, the output voltage of the Buck circuit cannot be stabilized, at the moment, the output voltage of the Buck circuit is the same as the input voltage, the input resistance is equal to the actual load resistance, and the Buck circuit is a constant-resistance load; when the input voltage of the Buck circuit is larger than the output voltage stabilizing value, the stable voltage V is output o_Buck_W The input power is constant, and the Buck circuit is a constant-power load V o_Buck_W 2 /R L . Accordingly, the input characteristic curve of the Buck voltage stabilizing circuit shown in FIG. 3 can be divided into a constant-resistance section and a constant-power section. The horizontal axis in the figure represents the Buck circuit load resistor R L The vertical axis represents the input power P in_Buck . It is known that when the Buck circuit for voltage stabilization is operated at constant resistance, i.e. the Buck circuit is not operated at voltage stabilization, the output voltage V o_Buck Input power P of high-frequency power amplifying circuit in_Amf The change curve of (2) is shown as part of line 1 of figure 4; when the Buck circuit used for voltage stabilization works at voltage stabilization, the output voltage V of the Buck circuit o_Buck Input power P of high-frequency power amplifying circuit in_Amf The change curve of (2) is shown in part by line 2 in figure 4. The power corresponding to the turning position of the line segment 1 and the line segment 2 is the critical power P of the critical output voltage stabilizing point A of the Buck circuit in_Amf_L ，P in_Amf_max Maximum input power allowed for the high frequency power amplifying circuit.
It can be seen that when the input power is lower than the critical power P in_Amf_L The Buck circuit output cannot be stabilized; when the input power is higher than P in_Amf_L When the system is in the power-on state, the output voltage is stabilized, but the MR-CPS efficiency of the magnetic resonance non-contact power supply of the system is dependent on the input power P in_Amf Increasing and decreasing. Therefore, the better working state of MR-CPS is at the critical voltage stabilization point.
The method for automatically searching the critical input power value of the voltage stabilization comprises the following steps:
when starting up, the input power P of the high-frequency power amplifying circuit is reduced or increased continuously with a certain step length in_Amf By judging whether the output voltage of the Buck circuit is stable or not, the critical input voltage V corresponding to the critical output voltage stabilization of the Buck circuit is found in_Buck_L Corresponding critical input power P in_Amf_L The method comprises the steps of carrying out a first treatment on the surface of the Then adding a certain step margin of input power P in_Amf The Buck circuit outputs stable voltage, and the input voltage V of the Buck circuit at the moment is recorded in_Buck_F ；
When the Buck circuit inputs the voltage V due to external reasons (such as the transmission distance between the power transmitting side and the receiving side becomes smaller, the drifting resonance frequency approaches the switching frequency, etc.) in_Buck Exceeding V in_Buck_F At one volt, the output voltage of the flyback circuit is reduced, i.e. the input power P is reduced in a self-adaptive manner in_Amf Re-execution to find the new threshold voltage V in_Buck_L And P in_Amf_L ；
When the transmission distance between the power transmitting side and the receiving side becomes larger due to external reasons (such as the influence of the shift of the resonance frequency away from the switching frequency, surrounding metal objects, etc.), V in_Buck Below V in_Buck_L When the flyback circuit is in the normal state, the output voltage of the flyback circuit is increased, i.e. the input power P is adaptively increased in_Amf Re-execution to find the new threshold voltage V in_Buck_L And P in_Amf_L ；
Otherwise, the input power is kept unchanged.
The corresponding flow diagram for tracking critical voltage stability is shown in fig. 5.
Fig. 6 shows a transmitting-end energy control implementation circuit: the singlechip of the wireless sensor at the receiving side (arranged at the high-voltage side of the electrical equipment) sends the output voltage signal of the Buck voltage stabilizing circuit obtained by sampling to the transmitting side through the wireless communication Zigbee module, the singlechip at the transmitting side generates PWM waves with a certain duty ratio according to the signal, and the DC voltage signal V is obtained after RC filtering ref_1 The signal is used for changing the reference voltage V of feedback control of the flyback circuit ref Thereby changing the output voltage of the flyback circuit, i.e. the input voltage of the high frequency power amplifying circuit, and thereby changing the output power of the high frequency power amplifying circuit, i.e. the input power of the energy transmitting module.
FIG. 7 is a graph showing the comparison of the efficiency of the magnetic resonance non-contact power supply MR-CPS of the system at different transmission distances during open loop and closed loop control. It can be seen from the figure that the efficiency of the closed-loop controlled MR-CPS is improved over that of the open-loop control, and that the efficiency is improved by about 20% at a closer transmission distance.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The magnetic resonance non-contact power supply system of the on-line monitoring wireless sensor is characterized in that the magnetic resonance non-contact power supply system of the on-line monitoring wireless sensor comprises:
the magnetic resonance non-contact power supply MR-CPS is used for non-contact transmitting and receiving electric energy in a magnetic resonance mode, providing a working power supply for the wireless sensor, and embedding feedback control of the magnetic resonance non-contact power supply MR-CPS into the wireless sensor;
the wireless sensor is used for monitoring the state quantity of the electrical equipment on line and transmitting the running state data of the high-voltage side of the electrical equipment to the upper computer in a wireless mode;
the magnetic resonance non-contact power supply MR-CPS comprises a transmitting power side and a receiving side; the transmitting power side comprises an AC/DC voltage stabilizing module, a high-frequency power amplifying module and an energy transmitting module;
the AC/DC voltage stabilizing module adopts a flyback circuit;
the high-frequency power amplifying module adopts an E-class high-frequency switch power amplifying circuit;
the receiving side comprises an energy receiving module and a rectifying and voltage stabilizing module;
the rectifying and voltage stabilizing module adopts a full-bridge rectifying and Buck voltage stabilizing circuit;
the energy transmitting module and the energy receiving module form a magnetic resonance non-contact electric energy transmission unit;
the method for automatically searching for the critical input power value by the magnetic resonance non-contact power supply system of the on-line monitoring wireless sensor comprises the following steps:
the input power P of the high-frequency power amplifying circuit is continuously reduced or continuously increased in a certain step length in_Amf By judging whether the output voltage of the Buck circuit is stable or not, the critical input voltage V corresponding to the critical output voltage stabilization of the Buck circuit is found in_Buck_L Corresponding critical input power P in_Amf_L The method comprises the steps of carrying out a first treatment on the surface of the Then adding a certain step margin of input power P in_Amf The Buck circuit outputs and stabilizes voltage, and records the input voltage V of the Buck circuit in_Buck_F ；
When Buck circuit inputs voltage V in_Buck Exceeding V in_Buck_F At one volt, the input power P is reduced adaptively in_Amf Searching for new input voltage V corresponding to critical voltage stabilization in_Buck_L And P in_Amf_L ；
When V is in_Buck Below V in_Buck_L Adaptive increase of input power P in_Amf Re-searching for V in_Buck Below V in_Buck_L Input voltage V corresponding to critical voltage regulation in_Buck_L And P in_Amf_L ；
Otherwise, the input power is kept unchanged.
2. The magnetic resonance non-contact power supply system for the on-line monitoring wireless sensor according to claim 1, wherein the wireless sensor comprises a sensor, a singlechip, a wireless communication module and an upper computer; the wireless communication module adopts a ZigBee module for communication.
3. The magnetic resonance non-contact power supply system for the on-line monitoring wireless sensor according to claim 1, wherein the magnetic resonance non-contact power supply MR-CPS utilizes a direct current generated by mains supply through a flyback circuit as input of an E-type high-frequency switch power amplifying circuit, the E-type high-frequency switch power amplifying circuit generates MHz sinusoidal alternating current as an excitation source of an energy transmitting module, and the energy receiving module receives corresponding energy and supplies power to the wireless sensor through a rectifying and voltage stabilizing Buck circuit;
the wireless sensor transmits the collected running state quantity of the high-voltage electric equipment to the upper computer, and simultaneously transmits the output voltage information of the voltage stabilizing Buck circuit to the transmitting side.
4. The magnetic resonance non-contact power supply system of the on-line monitoring wireless sensor according to claim 1, wherein the adaptive feedback control comprises output voltage information acquisition of a voltage stabilizing Buck circuit, wireless communication between a transmitting side and a receiving side and control of energy of the transmitting side;
in the case of the feedback control described above,
when the input voltage of the Buck circuit is smaller than the output voltage stabilizing value, the output cannot be stabilized;
when the input voltage of the Buck circuit is larger than the output voltage stabilizing value, the input power is constant, and the output voltage is stabilized;
when the load resistance of the Buck voltage-stabilizing circuit is constant, a critical input power value exists along with the change of the input power of the high-frequency power amplifying circuit in the output voltage so that the output of the Buck circuit can be stabilized; when the input power is lower than the critical input power value, the output cannot be stabilized; when the input power is higher than the critical input power value, the output voltage is stabilized.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219806A (en) * | 2013-04-18 | 2013-07-24 | 苏州源辉电气有限公司 | Wireless power transmission system applied to power supplying of high voltage line device |
| CN103280900A (en) * | 2013-05-31 | 2013-09-04 | 苏州源辉电气有限公司 | High-voltage power-taking and power-supply system based on wireless electricity transmission technology |
| CN104682678A (en) * | 2014-12-26 | 2015-06-03 | 深圳青铜剑电力电子科技有限公司 | Isolation power supply for IGBT (Insulated Gate Bipolar Transistor) driving |
| CN105245025A (en) * | 2015-10-12 | 2016-01-13 | 华中科技大学 | System for achieving dynamic wireless constant power charging and control method for system |
| CN106533222A (en) * | 2016-12-16 | 2017-03-22 | 中国科学院合肥物质科学研究院 | PSM high-voltage power supply system and feedback control realization method therefor |
| CN106787114A (en) * | 2017-01-20 | 2017-05-31 | 国家电网公司 | A kind of embedded wearable solar electric power supply system and its control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9564772B2 (en) * | 2011-04-25 | 2017-02-07 | Intersil Americas LLC | Charging system with adaptive power management |
-
2017
- 2017-12-07 CN CN201711283976.4A patent/CN108063500B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219806A (en) * | 2013-04-18 | 2013-07-24 | 苏州源辉电气有限公司 | Wireless power transmission system applied to power supplying of high voltage line device |
| CN103280900A (en) * | 2013-05-31 | 2013-09-04 | 苏州源辉电气有限公司 | High-voltage power-taking and power-supply system based on wireless electricity transmission technology |
| CN104682678A (en) * | 2014-12-26 | 2015-06-03 | 深圳青铜剑电力电子科技有限公司 | Isolation power supply for IGBT (Insulated Gate Bipolar Transistor) driving |
| CN105245025A (en) * | 2015-10-12 | 2016-01-13 | 华中科技大学 | System for achieving dynamic wireless constant power charging and control method for system |
| CN106533222A (en) * | 2016-12-16 | 2017-03-22 | 中国科学院合肥物质科学研究院 | PSM high-voltage power supply system and feedback control realization method therefor |
| CN106787114A (en) * | 2017-01-20 | 2017-05-31 | 国家电网公司 | A kind of embedded wearable solar electric power supply system and its control method |
Non-Patent Citations (1)
| Title |
|---|
| 高压电气设备在线监测无线传感器的磁谐振非接触供电;毛行奎;黄起升;兰石发;林茂;卢文成;;高电压技术;第43卷(第11期);全文 * |
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