CN108318738B - Phase detection circuit and parameter information detection method of wireless power transmission system - Google Patents
Phase detection circuit and parameter information detection method of wireless power transmission system Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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Abstract
The invention provides a phase detection circuit of a wireless electric energy transmission system and a parameter information detection method, wherein the phase detection circuit comprises a voltage division resistor, a bidirectional Zener diode, a comparator, an isolator, an AND gate, a single-pole double-throw analog switch and an RC filter. The voltage on a primary side capacitor of the wireless electric energy transmission system is converted into a small amplitude signal through a divider resistor and then is input into a comparator to generate a square wave, the square wave signal after passing through an isolator and a PWM (pulse-width modulation) wave which is generated by a controller and is in phase with primary side fundamental wave voltage are in phase with each other to obtain a phase detection signal, and the phase information is modulated onto a direct current voltage signal through a single-pole double-throw analog switch and an RC (resistor-capacitor) filter circuit. The parameter calculation program can calculate parameters such as a phase angle, impedance, and mutual inductance in the electromagnetic coupling device based on the direct-current voltage signal obtained by the phase detection circuit. The invention has the advantages of simplicity, high efficiency, low cost, reliable circuit, difficult interference and the like.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a phase detection circuit and a parameter information detection method of a wireless power transmission system.
Background
For the wireless power transmission system widely applied at present, the mutual inductance of the coupling coil is very important. To obtain the mutual inductance parameter of the coupling coil, the phase difference of the primary side voltage and current is measured. Conventional phase measurement methods generally obtain the phase difference by measuring the time interval of two signals divided by the period: the two signals with the same frequency are converted into digital signals through a comparator, the time interval of the two digital signals is measured through a counter, and the phase difference can be obtained by dividing the time interval by the period and multiplying the period by 360 degrees. The method is limited by the frequency of the counter, and a large error is generated when the phase difference of the high-frequency signals is measured. Therefore, in order to obtain the mutual inductance of the wireless power transmission system, it is necessary to improve the existing high-frequency signal phase detection technology.
The invention discloses a high-frequency signal phase difference measuring method (CN03543333A) through searching and finding of the prior art. The invention adopts a frequency measuring circuit to obtain the frequency of a high-frequency signal. The method comprises the steps of setting a digital orthogonal signal generating circuit by adopting a microcontroller circuit, outputting sine signals and cosine signals with the same frequency as high-frequency signals, demodulating the high-frequency signals by adopting two paths of demodulators respectively, synchronously sampling 4 paths of down-conversion signals by adopting 4 paths of synchronous acquisition circuits, sequentially quantizing, and finally measuring the phase difference of the high-frequency signals by calculation.
The existing phase detection and mutual inductance estimation method is difficult to meet the precision requirement of high-frequency signals on one hand, and is complex in detection process and high in cost on the other hand. Therefore, a parameter information detection method of a wireless power transmission system is needed in the present stage, and has the advantages of simplicity, high efficiency, low cost and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a phase detection circuit and a parameter information detection method of a wireless power transmission system, which can accurately calculate the phase angle, impedance, mutual inductance and other parameter values in the wireless power transmission system based on a direct current voltage signal obtained by the phase detection circuit.
The invention is realized according to the following technical scheme:
a phase detection circuit for a wireless power transfer system, comprising: the circuit comprises two voltage-dividing resistors R3 AND R4, a bidirectional Zener diode BZD, a comparator CMP, an isolator ISO, an AND gate AND, a single-pole double-throw analog switch SPDT AND an RC filter, wherein one end of a first voltage-dividing resistor R3 serves as a circuit input anode, AND the other end of the first voltage-dividing resistor R3 is connected with one end of a second voltage-dividing resistor R4, one end of the bidirectional Zener diode BZD AND one input end of the comparator CMP; the other end of the second voltage-dividing resistor R4 is connected with the other end of the bidirectional Zener diode BZD and the other input end of the comparator CMP to form a circuit input cathode; the output end of the comparator CMP is connected with the input end of the isolator ISO, AND the output end of the isolator ISO is connected with one input end of the AND gate AND; the other input end of the AND gate AND is used as the input end of the PWM signal, the output end of the AND gate AND is connected with the input end of the single-pole double-throw analog switch SPDT, AND the output end of the single-pole double-throw analog switch SPDT is connected with the input end of the RC filter.
In the above technical solution, the wireless power transmission system includes four capacitors C0-C3, eight power MOSFETs Q1-Q8, a resistor RL, two coils L1, L2, and coil internal resistances R1 and R2, wherein one end of the first capacitor C0 is connected to the drain of the power MOSFET Q1 and the drain of the power MOSFET Q3 to form an anode of the input terminal of the circuit, and the other end of the first capacitor C0 is connected to the source of the power MOSFET Q2 and the source of the power MOSFET Q4 to form a cathode of the input terminal of the circuit; the source electrode of the power MOSFET Q1, the drain electrode of the power MOSFET Q2 and one end of the coil L1 are connected; the source electrode of the power MOSFET Q3 is connected with the drain electrode of the power MOSFET Q4 and one end of the capacitor C1; the other end of the coil L1 is connected with the other end of the capacitor C1; one end of the coil L2 is connected with one end of the capacitor C2; the other end of the coil L2 is connected with the source electrode of a power MOSFET Q5 and the drain electrode of a power MOSFET Q6; the other end of the capacitor C2 is connected with the source electrode of the power MOSFET Q7 and the drain electrode of the power MOSFET Q8; the drain electrode of the power MOSFET Q5 is connected with the drain electrode of the power MOSFET Q7, one end of the capacitor C3 and one end of the resistor RL; the source of the power MOSFET Q6 is connected to the source of the power MOSFET Q8, the other terminal of the capacitor C3 and the other terminal of the resistor RL.
In the technical scheme, an input direct-current power Vin is inverted into alternating current V1 through a single-phase bridge circuit composed of four power MOSFETs Q1-Q4, and a primary side coil L1 is connected with a capacitor C1 in series. The secondary side coil L2 is connected in series with a capacitor C2, and forms an output voltage V0 through a rectifying circuit composed of four power MOSFETs Q5-Q8, and acts on a load RL.
In the above technical solution, the voltage on the primary side capacitor of the wireless power transmission system is converted into a small amplitude signal by the voltage dividing resistors R3 and R4, and then input to the comparator CMP, the generated square wave passes through the isolator ISO, and is controlled by the digital signal processor DSP to generate a PWM wave having the same phase as the primary side fundamental voltage and obtain a phase detection signal, and the information of the detection signal is modulated onto a dc voltage signal by the single-pole double-throw analog switch SPDT and the RC filter device.
A parameter information detection method of a wireless power transmission system is realized according to any one phase detection circuit, and is characterized by comprising the following steps:
step one, a primary side bridge arm phase angle α, a secondary side bridge arm phase angle β and a secondary side voltage current phase difference are combined
Initializing parameters of a resistor R2;
step two: sampling an input voltage Vin, an input current Iin, an output voltage V0, an output current I0 and a phase modulation voltage Vphase based on a synchronization circuit and a phase detection circuit;
step three: calculating a primary side voltage current phase difference theta and a load impedance RL;
step four: calculating equivalent resistance Re and equivalent reactance Xe;
step five: estimating secondary side excess impedance X2And the mutual inductance M is used for finishing the mutual inductance estimation of the wireless power transmission system.
Compared with the prior art, the invention has the following beneficial effects:
(1) the phase detection circuit can effectively avoid the signal from being interfered and has high reliability;
(2) the whole scheme has good implementation effect and low cost;
(3) and an additional control circuit is not needed, and the implementation is simple and convenient.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of a wireless power transmission system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a phase detection circuit according to an embodiment of the invention.
FIG. 3 is a flowchart of a parameter calculation procedure according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Fig. 1 is a schematic diagram of a wireless power transmission system in this embodiment. The wireless power transmission system comprises four capacitors C0-C3, eight power MOSFETs Q1-Q8, a resistor RL and two coils L1 and L2. One end of the first capacitor C0 is connected to the drain of the power MOSFET Q1 and the drain of the power MOSFET Q3, forming the positive terminal of the input terminal of the circuit. The other terminal of the first capacitor C0 is connected to the source of the power MOSFET Q2 and the source of the power MOSFET Q4, forming the cathode of the input terminal of the circuit. The source of power MOSFET Q1, the drain of power MOSFET Q2, and one end of coil L1 are connected. The source of the power MOSFET Q3 is connected to the drain of the power MOSFET Q4 and to one end of the capacitor C1. The other end of the coil L1 is connected to the other end of the capacitor C1. One end of the coil L2 is connected to one end of the capacitor C2. The other end of coil L2 is connected to the source of power MOSFET Q5 and the drain of power MOSFET Q6. The other end of the capacitor C2 is connected to the source of the power MOSFET Q7 and the drain of the power MOSFET Q8. The drain of the power MOSFET Q5 is connected to the drain of the power MOSFET Q7, one end of the capacitor C3, and one end of the resistor RL. The source of power MOSFET Q6 is connected to the source of power MOSFET Q8, the anode of diode D8, the other terminal of capacitor C3, and the other terminal of resistor RL.
An input direct-current power Vin is inverted into alternating current V1 through a single-phase bridge circuit consisting of four power MOSFETs Q1-Q4. The primary coil L1 is connected in series with the capacitor C1. The secondary side coil L2 is connected in series with a capacitor C2, and forms an output voltage V0 through a rectifying circuit consisting of four power MOSFETs Q5-Q8, and acts on a load RL.
Fig. 2 is a circuit diagram of the phase detection circuit in the present embodiment. The phase detection circuit diagram comprises two voltage division resistors R3 AND R4, a bidirectional Zener diode BZD, a comparator CMP, an isolator ISO, an AND gate AND, a single-pole double-throw analog switch SPDT AND an RC filter. One end of the first voltage-dividing resistor R3 is used as the circuit input anode, and the other end is connected with one end of the second voltage-dividing resistor R4, one end of the bidirectional zener diode BZD, and one input end of the comparator CMP. The other end of the second voltage-dividing resistor R4 is connected to the other end of the bidirectional zener diode BZD and the other input terminal of the comparator CMP, forming the negative electrode of the circuit input. The output of the comparator CMP is connected to the input of the isolator ISO. The output of the isolator ISO is connected to one input of the AND gate AND. The other input terminal of the AND gate AND serves as an input terminal of the PWM signal. AND the output end of the AND gate AND is connected with the input end of the single-pole double-throw analog switch SPDT. And the input end of an RC filter at the output end of the SPDT is connected.
The method comprises the steps of collecting voltage on a primary side capacitor C1 in a wireless power transmission system, converting the voltage into a small amplitude signal after voltage division through resistors R3 and R4, inputting the small amplitude signal into a comparator CMP, controlling a generated square wave to be in phase with a PWM (pulse-width modulation) wave of primary side fundamental wave voltage V1 through an isolator ISO (International Standard code for Mobile communications) to obtain a phase detection signal, and modulating phase information onto a direct current voltage signal Vphase after the detection signal passes through a single-pole double-throw analog switch SPDT and an RC (resistor-capacitor) filter device.
Fig. 3 is a flowchart of a parameter information detection method according to an embodiment of the present invention. The parameter information detection method can accurately calculate the phase angle, impedance, mutual inductance and other parameter values in the wireless power transmission system based on the direct current voltage signal obtained by the phase detection circuit, and comprises the following steps:
first, the primary side bridge arm phase angle α,Secondary side bridge arm phase angle β, secondary side voltage current phase difference
The equal parameters are given by a controller, the resistance R2 is the internal resistance of the coil, the value of the resistance is basically kept unchanged, and the coil can be measured by an LCR meter after being manufactured, so the parameters are known in the system initialization stage;
step two: based on a synchronous circuit and a phase detection circuit, sampling is carried out on input voltage Vin, input current Iin, output voltage V0, output current I0 and phase modulation voltage Vphase, wherein the signals are direct current signals, and the measurement technology is mature and easy to realize;
step three: the controller calculates a primary side voltage current phase difference theta according to the conversion relation between the phase and the direct current voltage, and calculates load impedance RL according to the output voltage V0 and the output current I0;
step four, according to the load impedance RL, the secondary side bridge arm phase angle β and the secondary side voltage current phase difference
Calculating equivalent resistance Re and equivalent reactance Xe;
step five: estimating secondary side excess impedance X2And the mutual inductance M is used for finishing the mutual inductance estimation of the wireless power transmission system.
The parameters of the main components in the example are as follows:
voltage dividing resistors R3, R4: 10k Ω and 2M Ω;
comparator CMP: a TLV 3502;
isolator ISO: ISO 7710;
AND gate AND: SN74LVCLG 08;
single-pole double-throw analog switch SPDT: NC7SB3157, 250 MHz;
digital signal processor DSP: TMS320F 28335.
The invention provides a phase detection circuit of a wireless power transmission system and a parameter information detection method, and has the advantages of simple and efficient calculation method, cheap and reliable circuit, difficulty in interference and obvious application value.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (3)
1. A phase detection circuit for a wireless power transfer system, comprising: the circuit comprises two voltage-dividing resistors R3 AND R4, a bidirectional Zener diode BZD, a comparator CMP, an isolator ISO, an AND gate AND, a single-pole double-throw analog switch SPDT AND an RC filter, wherein one end of a first voltage-dividing resistor R3 serves as a circuit input anode, AND the other end of the first voltage-dividing resistor R3 is connected with one end of a second voltage-dividing resistor R4, one end of the bidirectional Zener diode BZD AND one input end of the comparator CMP; the other end of the second voltage-dividing resistor R4 is connected with the other end of the bidirectional Zener diode BZD and the other input end of the comparator CMP to form a circuit input cathode; the output end of the comparator CMP is connected with the input end of the isolator ISO, AND the output end of the isolator ISO is connected with one input end of the AND gate AND; the other input end of the AND gate AND is used as the input end of the PWM signal, the output end of the AND gate AND is connected with the input end of the single-pole double-throw analog switch SPDT, AND the output end of the single-pole double-throw analog switch SPDT is connected with the input end of the RC filter;
the wireless power transmission system comprises four capacitors C0-C3, eight power MOSFETs Q1-Q8, a resistor RL, two coils L1 and L2 and coil internal resistances R1 and R2, wherein one end of a first capacitor C0 is connected with the drain of a power MOSFET Q1 and the drain of the power MOSFET Q3 to form the anode of a circuit input end, and the other end of the first capacitor C0 is connected with the source of the power MOSFET Q2 and the source of the power MOSFET Q4 to form the cathode of the circuit input end; the source electrode of the power MOSFET Q1, the drain electrode of the power MOSFET Q2 and one end of the coil L1 are connected; the source electrode of the power MOSFET Q3 is connected with the drain electrode of the power MOSFET Q4 and one end of the capacitor C1; the other end of the coil L1 is connected with the other end of the capacitor C1; one end of the coil L2 is connected with one end of the capacitor C2; the other end of the coil L2 is connected with the source electrode of a power MOSFET Q5 and the drain electrode of a power MOSFET Q6; the other end of the capacitor C2 is connected with the source electrode of the power MOSFET Q7 and the drain electrode of the power MOSFET Q8; the drain electrode of the power MOSFET Q5 is connected with the drain electrode of the power MOSFET Q7, one end of the capacitor C3 and one end of the resistor RL; the source electrode of the power MOSFET Q6 is connected with the source electrode of the power MOSFET Q8, the other end of the capacitor C3 and the other end of the resistor RL;
the voltage on the primary side capacitor of the wireless power transmission system is converted into a small-amplitude signal through voltage dividing resistors R3 and R4 and then input into a comparator CMP, the generated square wave passes through an isolator ISO and then is controlled by a digital signal processor DSP to generate a PWM wave phase which is in the same phase with the primary side fundamental wave voltage to obtain a phase detection signal, and the information of the detection signal is modulated onto a direct current voltage signal through a single-pole double-throw analog switch SPDT and an RC filter device.
2. The phase detection circuit of claim 1, wherein the input dc power Vin is inverted into ac V1 through a single-phase bridge circuit comprising four power MOSFETs Q1-Q4, and the primary winding L1 is connected in series with the capacitor C1. The secondary side coil L2 is connected in series with a capacitor C2, and forms an output voltage V0 through a rectifying circuit composed of four power MOSFETs Q5-Q8, and acts on a load RL.
3. A method for detecting parameter information of a wireless power transmission system, which is implemented by the phase detection circuit according to any one of claims 1-2, comprising the steps of:
initializing various parameters of a primary side bridge arm phase angle α, a secondary side bridge arm phase angle β and a secondary side voltage current phase difference resistor R2;
step two: sampling an input voltage Vin, an input current Iin, an output voltage V0, an output current I0 and a phase modulation voltage Vphase based on a synchronization circuit and a phase detection circuit;
step three: calculating a primary side voltage current phase difference theta and a load impedance RL;
step four: calculating equivalent resistance Re and equivalent reactance Xe;
step five: and estimating the secondary side redundant impedance X2 and the mutual inductance M to complete the mutual inductance estimation of the wireless power transmission system.
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