CN110212655A - Self-resonance, super-silent wireless power supply system based on Zero-cross comparator - Google Patents
Self-resonance, super-silent wireless power supply system based on Zero-cross comparator Download PDFInfo
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- CN110212655A CN110212655A CN201910540760.4A CN201910540760A CN110212655A CN 110212655 A CN110212655 A CN 110212655A CN 201910540760 A CN201910540760 A CN 201910540760A CN 110212655 A CN110212655 A CN 110212655A
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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
-
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
Abstract
The present invention relates to electric energy transmission fields to promote output power and efficiency, reduce external electromagnetic interference to realize automatically tracking for resonance frequency.The present invention, self-resonance, super-silent wireless power supply system based on Zero-cross comparator, it include: power supply, choke coil, capacitor, transmitting coil, magnetic core, receiving coil, full-wave rectification bridge, electric capacity of voltage regulation, resonant capacitance, coupler, zero detector, d type flip flop, pulse width modulation (PWM) signal generator or door, phase inverter, switch composition, the connection of first pin of power supply and choke coil, second pin of choke coil and first pin of capacitor connect, second pin ground connection of capacitor；Second pin of choke coil and the centre cap of transmitting coil connect, and transmitting coil is coupled by magnetic core with receiving coil.Present invention is mainly applied to super-silent wireless power supply systems to manufacture and design occasion.
Description
Technical field
The present invention relates to electric energy transmission fields, more particularly, to non-contact power supply field.
Background technique
Wheel measuring equipment such as laser radar system, rotating machinery telemetry system etc. realizes level in the operating condition
360 ° of scannings, traditional conducting wire power supply mode will appear conducting wire winding problem, be unable to satisfy power reguirements.Meanwhile equipment is in work
It is generally higher to make revolving speed under state, is powered according to contact power supply such as slip ring, brush, then the service life of system will
Will receive limitation, according to the literature, using slip ring power laser radar service life be about 1,000 hours, need periodically into
Row maintenance.In order to improve its service life, power supply mode should select non-contact power supply.
Common non-contact power supply mode has electromagnetic coupling resonance wireless power and inductively wireless power, magnetic coupling
The advantage of resonance type wireless power supply is that electric energy can be sent to relatively at a distance, but magnetic coupling resonance wireless power mode efficiency
It is low, electromagnetic interference is big, and when transimission power is larger, the size of coil is also larger, is unfavorable for integrated.At the same time, exist
In above-mentioned application, power supply distance is simultaneously little, about 1mm, therefore this system can further decrease transmitting coil and receiving coil
Distance, then by the way of inductively.
When using inductively mode is powered, in order to increase the coefficient of coup, promote power supply efficiency, reduction to dispatch from foreign news agency
Magnetic disturbance should introduce the magnetic line of force that magnetic core collects coil generation, while use current mode parallel resonance Switching Power Supply, and make circuit
Work is under the natural frequency of circuit.The characteristics of according to the circuit of above principle design with its low interference, referred to as super-silent change
Parallel operation.But in the application of slewing power supply, coil distance can generate small transformation, and due to introducing magnetic core, emission lines
Circle and receiving coil are between close coupling and loose coupling, these small distance changes will affect the resonance frequency of system, make
System can not long-term work in resonant state.Traditional mute converter is generally operational under static operating condition, cannot achieve frequency
Tracking, in order to make up this deficiency, traditional mute converter is improved to self-resonance, super by Ying Zengjia frequency-tracking system
Mute wireless power supply system.And currently used frequency tracking method, it generally requires and compares primary coil voltage and current phase
Difference or primary coil voltage and secondary coil voltage phase difference, it is all complex although can be realized automatic tuning.In order to
Guarantee that the power supply system always works in resonant state, reduce complexity in circuits, designs a kind of based on Zero-cross comparator method
Self-resonance, super-silent wireless power supply system.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to propose it is a kind of self-resonance based on Zero-cross comparator method, super quiet
Sound wireless power supply system.The system adjusts the switching frequency of Switching Power Supply by the point of zero voltage of detection transmitting coil, realizes humorous
Vibration frequency automatically tracks, and promotes output power and efficiency, reduces external electromagnetic interference.For this purpose, the technical side that the present invention takes
Case is self-resonance, super-silent wireless power supply system based on Zero-cross comparator, comprising: power supply, choke coil, capacitor, transmitting coil,
Magnetic core, receiving coil, full-wave rectification bridge, electric capacity of voltage regulation, resonant capacitance, coupler, zero detector, d type flip flop, pulse width
First pin of modulation (PWM) signal generator or door, phase inverter, switch composition, power supply and choke coil connects, choke coil
The connection of first pin of second pin and capacitor, second pin ground connection of capacitor；Second pin and hair of choke coil
The centre cap of ray circle connects, and transmitting coil is coupled by magnetic core with receiving coil, and receiving coil is connect with full-wave rectification bridge；
The output of rectifier bridge is connect with electric capacity of voltage regulation, provides power for load；Transmitting coil is in parallel with resonant capacitance, constitutes resonant cavity；
The centre cap of transmitting coil is connected by coupler with zero detector, zero detector export respectively with d type flip flop
Input and PWM generator are connected；The output end of d type flip flop with or an input terminal of door be connected, the output end of PWM generator
With or another port of door be connected；Or the output end of door is connected with the input terminal of phase inverter and a grid switched, instead
The output end of phase device is connected with the grid that another is switched；The source electrode of two switches is grounded respectively, the drain electrode point of two switches
It does not connect at the both ends of transmitting coil.
Further, the effect of power supply is to provide electric energy for system；The effect of choke coil and capacitor is to guarantee that institute is stateful
It is down continuous by the electric current of circuit；One effect of magnetic core is the coefficient of coup for improving transmitting coil and receiving coil, magnetic
Another effect of core is the magnetic line of force for shielding transmitting coil and receiving coil, reduces transmitting coil and the external electricity of receiving coil
Magnetic disturbance；The effect of electric capacity of voltage regulation is the voltage steady state value made in load；The effect of zero detector is detection transmitting coil
The zero point of voltage at centre cap overturns the state of d type flip flop, while making pwm signal when detecting zero signal
The output of device is 0；The effect of PWM signal generator is that pwm signal is generated before resonance occurs for circuit, the effect of two switches
It is the both ends interleaved ground for controlling transmitting coil.
Further, by choke coil guarantee institute it is stateful time by the electric current of circuit be continuous；Iron can be used in magnetic core
Powder magnetic core, iron aluminium silicon powder magnetic core, FERRITE CORE improve the coefficient of coup of transmitting coil and receiving coil by using magnetic core,
The magnetic line of force of transmitting coil and receiving coil is shielded simultaneously, reduces transmitting coil and the external electromagnetic interference of receiving coil.
When system starts, d type flip flop output is 0, and PWM generator sending rate first is slightly below system resonance frequencies
Pwm control signal, at this time or door output rating is slightly below the pwm control signal of system resonance frequencies or the pwm signal benefit of door sending
With a phase inverter, make two switch work in different conditions, voltage will appear sine at the centre cap of transmitting coil at this time
The waveform of wave absolute value form, and frequency is 2 times of system resonance frequencies；After transmitting coil center tap voltage passes through coupler
It is detected by zero detector, when zero detector detects transmitting coil center tap voltage zero point, resets pwm signal
Device, and d type flip flop state is overturn, d type flip flop can generate the frequency with the consistent pwm signal of system resonance frequencies at this time,
And make or the frequency of the output of door and the consistent pwm signal of system resonance frequencies, when the resonance frequency of system fluctuates,
System can realize the tracking of system frequency according to the zero point of transmitting coil center tap voltage.
Work is switched in zero voltage switching state, the common power supply such as linear power supply, Switching Power Supply can be used in power supply, and capacitor can
Using ceramic condenser, mica capacitor or polystyrene capacitor, enameled wire is can be used in transmitting coil or litz wire is made, transmitting
Line footpath, size and the number of turns of coil make according to maximum transmission power, and enameled wire, litz wire system can be used in receiving coil
Make, line footpath, size and the number of turns of transmitting coil make according to maximum transmission power, while meeting the following conditions: transmitting coil
Line footpath is rt, coil radius Rt, coil turn Nt；The line footpath of transmitting coil 6 is rr, coil radius Rr, coil turn be
Nr, then should meet rt=rr,Rt=Rr,Nt=2Nr。
Full-wave rectification bridge is formed by 4 with model rectifier diode, electric capacity of voltage regulation can be used ceramic condenser, mica capacitor or
Ceramic condenser, mica capacitor or polystyrene capacitor can be used in polystyrene capacitor, resonant capacitance, and direct coupling can be used in coupler
Conjunction mode holds resistance coupled modes, and zero detector builds Zero-cross comparator circuit using comparator chip, PWM generator use than
It is built compared with device chip, triode or power field effect transistor can be used in switch.
The features of the present invention and beneficial effect are:
1) self-resonance, super-silent wireless power supply system based on Zero-cross comparator method collect the magnetic of coil generation using magnetic core
The line of force can be effectively reduced the electromagnetic interference of system external.
2) self-resonance, super-silent wireless power supply system based on Zero-cross comparator method can automatically track the resonance of power supply system
Frequency always works in system under resonant state.
3) self-resonance, super-silent wireless power supply system based on Zero-cross comparator method always work in resonance frequency, can mention
The power and efficiency of high wireless power.
Detailed description of the invention:
A kind of self-resonance based on Zero-cross comparator method of Fig. 1, super-silent wireless power supply system
In Fig. 1,1 is power supply, and 2 be choke coil, and 3 be capacitor, and 4 be transmitting coil, and 5 be magnetic core, and 6 be receiving coil, and 7 be complete
Wave rectifier bridge, 8 be electric capacity of voltage regulation, and 9 be resonant capacitance, and 10 be coupler, and 11 be zero detector, and 12 be d type flip flop, and 13 are
PWM generator, 14 are or door, and 15 be phase inverter, and 16 be switch.
Specific embodiment
It realizes above-mentioned purpose, designs a kind of self-resonance based on Zero-cross comparator method, super-silent wireless power supply system, packet
It includes: power supply 1, choke coil 2, capacitor 3, transmitting coil 4, magnetic core 5, receiving coil 6, full-wave rectification bridge 7, electric capacity of voltage regulation 8, resonance electricity
Appearance 9, coupler 10, zero detector 11, d type flip flop 12, pulse width modulate (PWM) generator 13 or door 14, phase inverter
15, switch 16.
Fig. 1, power supply 1 and choke coil 2 are shown in a kind of self-resonance based on Zero-cross comparator method, super-silent wireless power supply system
The connection of first pin, second pin of choke coil 2 connect with first pin of capacitor 3, second pin of capacitor 3
Ground connection.
Further, second pin of choke coil 2 is connect with the centre cap of transmitting coil 4, and transmitting coil 4 passes through magnetic
Core 5 is coupled with receiving coil 6, and receiving coil 6 forms full-wave rectification bridge 7 with the diode by 4 same models and connect.
Further, the output of rectifier bridge 7 is connect with electric capacity of voltage regulation 8, provides power for load.
Further, transmitting coil 4 is in parallel with resonant capacitance 9, constitutes resonant cavity.
Further, the centre cap of transmitting coil 4 is connected by coupler 10 with zero detector 11, zero detector
11 output is connected with the input of d type flip flop 12 and PWM generator 13 respectively.
Further, the output end of d type flip flop 12 with or an input terminal of door 14 be connected, the output of PWM generator 13
Hold with or another port of door 14 be connected.
Further or the output end of door 14 is connected with the grid of the input terminal of phase inverter 15 and a switch 16, instead
The output end of phase device 15 is connected with the grid of another switch 16.
Further, the source electrode of two switches 16 is grounded respectively, and the drain electrode of two switches 16 is connect respectively in transmitting coil 4
Both ends.
Further, the effect of power supply 1 is to provide electric energy for system；The effect of choke coil 2 and capacitor 3 is to guarantee all shapes
Electric current under state by circuit is continuous；One effect of magnetic core 5 is the coupled systemes for improving transmitting coil 4 and receiving coil 6
Number, another effect of magnetic core 5 are the magnetic lines of force for shielding transmitting coil 4 and receiving coil 6, reduce transmitting coil 4 and receive line
Enclose 6 external electromagnetic interferences；The effect of electric capacity of voltage regulation 8 is the voltage steady state value made in load；The effect of zero detector 11
It is to detect the zero point of voltage at 4 centre cap of transmitting coil to overturn the state of d type flip flop 12 when detecting zero signal,
Make the output 0 of PWM signal generator 13 simultaneously；The effect of PWM signal generator 13 is generated before resonance occurs for circuit
Pwm signal.The effect of two switches 16 is the both ends interleaved ground for controlling transmitting coil 4.
Further, in the present invention, by choke coil 2 guarantee institute it is stateful time by the electric current of circuit be continuous；
The coefficient of coup of transmitting coil 4 and receiving coil 6 is improved by using magnetic core 5, while shielding transmitting coil 4 and receiving coil 6
The magnetic line of force, reduce transmitting coil 4 and the external electromagnetic interference of receiving coil 6.
Further, when system starts, the output of d type flip flop 12 is 0, and the sending rate first of PWM generator 13 is slightly below
The pwm control signal of system resonance frequencies, at this time or 14 output rating of door is slightly below the pwm control signals of system resonance frequencies, or
The pwm signals that door 14 issues utilize a phase inverter 15, two switches 16 is made to work in different conditions, at this time transmitting coil 4
Voltage will appear the waveform of sine wave absolute value form at centre cap, and frequency is 2 times of system resonance frequencies；Transmitting coil
4 center tap voltages are detected after passing through coupler 4 by zero detector 11.When zero detector 11 detects in transmitting coil 4
When heart tap voltage zero point, PWM signal generator 13 is resetted, and overturns d type flip flop state.D type flip flop can generate at this time
With the frequency of the consistent pwm signal of system resonance frequencies, and make or the output of door 14 and the consistent PWM of system resonance frequencies believe
Number frequency, when the resonance frequency of system fluctuates, system can be real according to the zero point of 4 center tap voltage of transmitting coil
The tracking of existing system frequency.
Further, the work of switch 16, can be effectively compared with Small Switch Losses, the effect of lifting system in zero voltage switching state
Rate.
Further, the common power supply such as linear power supply, Switching Power Supply can be used in power supply 1.Such as use the bright limited public affairs of latitude electronics
Take charge of the Switching Power Supply of model LRS-50-24.
Further, common choke coil or the biggish inductance of inductance can be used in choke coil 2.Such as use inductance
For the duolateral inductance of 220uH.
Further, ceramic condenser, mica capacitor, polystyrene capacitor etc. can be used in capacitor 3.Such as use capacitance for
The ceramic condenser of 0.047uF.
Further, transmitting coil 4 can be used enameled wire, litz wire etc. and be made.Line footpath, the size of transmitting coil 4
It is made with the number of turns according to maximum transmission power.It uses line footpath such as the enameled wire of 0.8mm, is fabricated to internal diameter 15mm, outer diameter 35mm,
The coil of 36 circle of the number of turns.
Further, magnetic powder core, iron aluminium silicon powder magnetic core, FERRITE CORE etc. can be used in magnetic core 5.Such as use model
The FERRITE CORE of GU36.
Further, receiving coil 6 can be used enameled wire, litz wire etc. and be made.Line footpath, the size of transmitting coil 6
It is made with the number of turns according to maximum transmission power.Meet the following conditions simultaneously: setting the line footpath of transmitting coil 4 as rt, coil radius be
Rt, coil turn Nt；The line footpath of transmitting coil 6 is rr, coil radius Rr, coil turn Nr.R should then be mett=rr,Rt
=Rr,Nt=2Nr.It uses line footpath such as the enameled wire of 0.8mm, is fabricated to internal diameter 15mm, outer diameter 35mm, the coil of 18 circle of the number of turns.
Further, full-wave rectification bridge 7 can be formed by 4 with model rectifier diode.As using model 1N5819
Rectifier diode.
Further, ceramic condenser, mica capacitor, polystyrene capacitor etc. can be used in electric capacity of voltage regulation 8.Such as use capacitance for
The ceramic condenser of 1uF.
Further, ceramic condenser, mica capacitor, polystyrene capacitor etc. can be used in resonant capacitance 9.Such as use capacitance for
The ceramic condenser of 10uF.
Further, coupler 10 can be used direct coupling system, hold and hinder coupled modes etc..Such as use resistance value for 100k Ω
Resistance.
Further, zero detector 11 can be used common comparator chip and build Zero-cross comparator circuit.Such as use type
Number Zero-cross comparator circuit is built for the comparator chip of LM339.
Further, common d type flip flop chip can be used in d type flip flop 12.Such as use the d type flip flop of model 74S74
Chip.
Further, PWM generator 13 can be used common comparator chip and build PWM generation circuit.Such as use model
PWM generation circuit is built for the comparator chip of LM339.
Further or common or door chip can be used in door 14.Such as using model 7432 or door chip.
Further, common NOT gate chip can be used in phase inverter 15.Such as use the NOT gate chip of model CD4069.
Further, triode, power field effect transistor etc. can be used in switch 16.Switch 16 should have sufficiently high resistance to
Pressure value and conducting electric current.Such as use the power field effect transistor of model INR540N.
Claims (6)
1. a kind of self-resonance based on Zero-cross comparator, super-silent wireless power supply system, characterized in that include: power supply, choke coil,
Capacitor, transmitting coil, magnetic core, receiving coil, full-wave rectification bridge, electric capacity of voltage regulation, resonant capacitance, coupler, zero detector, D
First of trigger, pulse width modulation (PWM) signal generator or door, phase inverter, switch composition, power supply and choke coil draws
Foot connection, second pin of choke coil and first pin of capacitor connect, second pin ground connection of capacitor；Choke coil
The connection of the centre cap of second pin and transmitting coil, transmitting coil are coupled with receiving coil by magnetic core, receiving coil and
Full-wave rectification bridge connection；The output of rectifier bridge is connect with electric capacity of voltage regulation, provides power for load；Transmitting coil and resonant capacitance are simultaneously
Connection constitutes resonant cavity；The centre cap of transmitting coil is connected by coupler with zero detector, the output point of zero detector
It is not connected with the input of d type flip flop and PWM generator；The output end of d type flip flop with or an input terminal of door be connected, PWM
The output end of generator with or another port of door be connected；Or door output end and phase inverter input terminal and one switch
Grid be connected, the output end of phase inverter is connected with the grid that another is switched；The source electrode of two switches is grounded respectively, and two
The drain electrode of switch is connect respectively at the both ends of transmitting coil.
2. the self-resonance based on Zero-cross comparator, super-silent wireless power supply system as described in claim 1, characterized in that power supply
Effect be to provide electric energy for system；The effect of choke coil and capacitor be guarantee institute it is stateful time by the electric current of circuit be continuous
's；One effect of magnetic core is the coefficient of coup for improving transmitting coil and receiving coil, another effect of magnetic core is shielding hair
The magnetic line of force of ray circle and receiving coil reduces transmitting coil and the external electromagnetic interference of receiving coil；The effect of electric capacity of voltage regulation
It is the voltage steady state value made in load；The effect of zero detector is to detect the zero point of voltage at transmitting coil centre cap,
When detecting zero signal, the state of d type flip flop is overturn, while making the output 0 of PWM signal generator；Pwm signal hair
The effect of raw device is that pwm signal is generated before resonance occurs for circuit, and the effect of two switches is the both ends for controlling transmitting coil
Interleaved ground.
3. the self-resonance based on Zero-cross comparator, super-silent wireless power supply system as described in claim 1, characterized in that pass through
Choke coil guarantee institute it is stateful time by the electric current of circuit be continuous；Magnetic powder core, iron aluminium silicon powder magnetic core, iron can be used in magnetic core
Ferrite core, the coefficient of coup of transmitting coil and receiving coil is improved by using magnetic core, while being shielded transmitting coil and being received
The magnetic line of force of coil reduces transmitting coil and the external electromagnetic interference of receiving coil.
4. the self-resonance based on Zero-cross comparator, super-silent wireless power supply system as described in claim 1, characterized in that start
When work, d type flip flop output is 0, and PWM generator sending rate first is slightly below the pwm control signal of system resonance frequencies, at this time
Or the pwm signal that door output rating is slightly below the pwm control signal of system resonance frequencies or door issues is made using a phase inverter
Two switch work are in different conditions, and voltage will appear the wave of sine wave absolute value form at the centre cap of transmitting coil at this time
Shape, and frequency is 2 times of system resonance frequencies；Transmitting coil center tap voltage after coupler by zero detector by being examined
It surveys, when zero detector detects transmitting coil center tap voltage zero point, resets PWM signal generator, and make d type flip flop
State overturning, d type flip flop can generate the frequency with the consistent pwm signal of system resonance frequencies at this time, and make or the output of door
For the frequency with the consistent pwm signal of system resonance frequencies, when the resonance frequency of system fluctuates, system can be according to hair
The zero point of ray circle center tap voltage realizes the tracking of system frequency.
5. the self-resonance based on Zero-cross comparator, super-silent wireless power supply system as described in claim 1, characterized in that switch
Work is in zero voltage switching state, and linear power supply or Switching Power Supply can be used in power supply, and ceramic condenser, mica capacitor can be used in capacitor
Or polystyrene capacitor, enameled wire can be used in transmitting coil or litz wire is made, line footpath, size and the number of turns of transmitting coil
It is made according to maximum transmission power, enameled wire can be used in receiving coil, litz wire is made, line footpath, the size of transmitting coil
Made with the number of turns according to maximum transmission power, while meeting the following conditions: the line footpath of transmitting coil is rt, coil radius Rt, line
Circle the number of turns is Nt；The line footpath of transmitting coil 6 is rr, coil radius Rr, coil turn Nr, then should meet rt=rr,Rt=Rr,
Nt=2Nr。
6. the self-resonance based on Zero-cross comparator, super-silent wireless power supply system as described in claim 1, characterized in that all-wave
Rectifier bridge is formed by 4 with model rectifier diode, and ceramic condenser, mica capacitor or polystyrene electricity can be used in electric capacity of voltage regulation
Hold, ceramic condenser, mica capacitor or polystyrene capacitor can be used in resonant capacitance, and direct coupling system or appearance can be used in coupler
Coupled modes are hindered, zero detector builds Zero-cross comparator circuit using comparator chip, and PWM generator is taken using comparator chip
It builds, triode or power field effect transistor can be used in switch.
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| CN201910540760.4A CN110212655A (en) | 2019-06-21 | 2019-06-21 | Self-resonance, super-silent wireless power supply system based on Zero-cross comparator |
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| CN201910540760.4A CN110212655A (en) | 2019-06-21 | 2019-06-21 | Self-resonance, super-silent wireless power supply system based on Zero-cross comparator |
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Application publication date: 20190906 |