CN110954749B - Electric automobile wireless charging phase detection circuit for realizing frequency tracking - Google Patents
Electric automobile wireless charging phase detection circuit for realizing frequency tracking Download PDFInfo
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Abstract
The invention provides an electric automobile wireless charging phase detection circuit for realizing frequency tracking, which comprises: the sampling circuit, the sampling conditioning circuit, the multiplexer and the low-pass filter; the sampling circuit is used for collecting an inversion current signal of an inversion main circuit of the wireless charging transmitting terminal of the electric automobile; the sampling conditioning circuit is used for respectively carrying out forward amplification and reverse amplification on the inversion current signals to obtain two paths of output signals with phase difference of 180 degrees, and the two paths of output signals are used as two paths of input signals of the multiplexer; the multiplexer is used for selecting one path from two paths of input signals of the multiplexer as an output signal according to a channel selection signal, and the channel selection signal is obtained by delaying a driving signal of an advanced bridge arm of the main inverter circuit by 90 degrees; the low-pass filter is used for performing low-pass filtering on the output signal of the multiplexer to obtain a phase detection signal. The phase detection circuit has simple structure and low cost.
Description
Technical Field
The invention relates to an electric automobile wireless charging phase detection circuit for realizing frequency tracking, and belongs to the technical field of electric automobile wireless charging.
Background
The existing wireless charging mode of the electric automobile is generally a magnetic coupling resonance type wireless charging mode, the charging mode transfers energy by utilizing the principle of circuit resonance, when the circuit is in resonance, the current in a loop is maximum, so that the coupling between a transmitting end coil and a receiving end coil is strongest, and the energy exchange is strongest.
The wireless charging system of electric automobile relates to multistage power electronic transformation, and its transmitting terminal relates to 1 and above resonant cavity, and the passive device of resonant cavity is because the deviation of processing technology, raw and other materials size and material during batch production, and there is certain parameter error in its self-inductance volume of coil under different skew operating modes simultaneously, leads to the switching frequency of the wireless charging system transmitting terminal contravariant main circuit of electric automobile and resonant frequency to mismatch, has the problem that the detuning makes transmitting terminal efficiency reduce.
When the frequency of the phase-locked loop is detuned, a phase difference exists between an inversion current and an inversion voltage of the inversion main circuit, so that the phase difference is detected through the phase-locked loop frequency tracking circuit at present, the switching frequency of the inversion main circuit is adjusted according to the detected phase difference, the switching frequency is consistent with the resonance frequency, and the efficiency of a transmitting end is improved. However, when the phase difference is detected by the conventional phase-locked loop frequency tracking circuit, not only the inverter current and the inverter voltage need to be detected simultaneously, but also the circuit structure is complex and the cost is high.
Disclosure of Invention
The invention aims to provide a wireless charging phase detection circuit for an electric automobile, which is used for realizing frequency tracking and is used for solving the problem that the existing circuit for detecting the inverter current-voltage phase difference of an inverter main circuit is complex in structure.
In order to achieve the above object, the present invention provides a wireless charging phase detection circuit for an electric vehicle, which is used for implementing frequency tracking, and the phase detection circuit includes: the sampling circuit, the sampling conditioning circuit, the multiplexer and the low-pass filter;
the sampling circuit is used for collecting an inversion current signal of an inversion main circuit of the wireless charging transmitting terminal of the electric automobile;
the sampling conditioning circuit is used for respectively carrying out forward amplification and reverse amplification on the inversion current signals to obtain two paths of output signals with phase difference of 180 degrees, and the two paths of output signals are used as two paths of input signals of the multiplexer;
the multiplexer is used for selecting one path from two paths of input signals of the multiplexer as an output signal according to a channel selection signal, and the channel selection signal is obtained by delaying a driving signal of an advanced bridge arm of the main inverter circuit by 90 degrees;
the low-pass filter is used for performing low-pass filtering on the output signal of the multiplexer to obtain a phase detection signal.
The invention has the beneficial effects that: when the wireless charging phase detection circuit for the electric automobile detects the phase difference between the inversion current and the inversion voltage of the main inversion circuit, only the inversion current signal needs to be acquired, and the inversion voltage signal does not need to be acquired.
In order to more sensitively detect the phase difference between the inversion current and the inversion voltage of the main inverter circuit, the phase detection circuit further comprises a phase detection conditioning circuit, and the phase detection conditioning circuit is used for differentially amplifying the phase detection signal to obtain a phase detection conditioning signal.
In order to realize the synchronization of the switching frequency and the resonant frequency of the inverter main circuit and improve the efficiency of the wireless charging transmitting terminal of the electric automobile, the phase detection circuit further comprises a controller, wherein the controller is used for generating a driving signal of the inverter main circuit according to the phase detection signal so as to enable the switching frequency and the resonant frequency of the inverter main circuit to be consistent.
In order to realize the synchronization of the switching frequency and the resonant frequency of the inverter main circuit and improve the efficiency of the wireless charging transmitting terminal of the electric automobile, the phase detection circuit further comprises a controller, wherein the controller is used for generating a driving signal of the inverter main circuit according to the phase detection conditioning signal so as to enable the switching frequency and the resonant frequency of the inverter main circuit to be consistent.
Further, the sampling circuit is a current transformer sampling circuit, a current hall sampling circuit or a divider resistor sampling circuit.
Furthermore, the sampling conditioning circuit comprises a forward amplifier and a reverse amplifier, and the amplification factors of the two amplifiers are the same.
Drawings
FIG. 1 is a functional block diagram of the phase detection circuit of the present invention;
FIG. 2 is a circuit connection diagram of the phase detection circuit of the present invention;
FIG. 3 is an exemplary waveform diagram of the phase detection circuit of the present invention;
fig. 4 is a flowchart of a frequency tracking control method of a phase detection circuit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment provides a phase detection circuit, which is used for detecting the phase of an inverter current in a transmitting end inverter circuit in a wireless charging system of an electric vehicle, and can realize frequency tracking control. As shown in fig. 1, the phase detection circuit includes a sampling circuit, a sampling conditioning circuit, a multiplexer, and a low pass filter.
The sampling circuit Is used for collecting an inversion current signal Is of an inversion main circuit of the wireless charging transmitting end of the electric automobile; in this embodiment, the sampling circuit Is a current transformer sampling circuit, that Is, the acquisition of the inverted current signal Is realized by connecting the inverted main loop with the current transformer in series and then connecting the sampling resistor in parallel; as another embodiment, the sampling circuit may also be a current hall sampling circuit, that Is, the acquisition of the inverted current signal Is realized by connecting the inverted main loop to the sampling resistor in parallel after passing through the current hall; or the sampling circuit can also be a divider resistor sampling circuit, namely the collection of the inverter current signal Is realized by adopting a mode that an inverter main loop Is directly connected with a sampling resistor in series.
The sampling conditioning circuit Is used for respectively carrying out forward amplification and reverse amplification on the acquired inverter current signals Is to obtain two output signals with the phase difference of 180 degrees as two input signals Iinv1 and Iinv2 of the multiplexer; as shown in fig. 2, in the present embodiment, the sampling conditioning circuit includes a forward amplifier and a reverse amplifier, specifically, the forward amplifier includes resistors R1 and R2 and an operational amplifier U1A, and has a gain Ga of 1+ R2/R1, the reverse amplifier includes resistors R3 and R4 and an operational amplifier U1B, and has a gain Ga' -R4/R3, and 1+ R2/R1 of R4/R3. The forward amplifier Is used for performing forward amplification on the inverter current signal Is to obtain one input signal Iinv1 of the multiplexer: the inverting amplifier Is used for inverting and amplifying the inverter current signal Is to obtain another input signal Iiv 2 of the multiplexer: iinv2 ═ Is × (-R4/R3) ═ Ga × Is.
The multiplexer (such as OPA875IDR) Is used for selecting one path from two paths of input signals (namely Iiv 1 and Iiv 2) as an output signal Is1 according to the channel selection signal; as shown in fig. 2, in this embodiment, the channel selection signal of the multiplexer Is obtained by delaying the driving signal of the leading arm of the main inverter circuit by 90 °, and here, the channel selection signal Is represented by a PWM1 signal, the multiplexer selects the output signal according to the level of the PWM1 signal, and when the PWM1 signal Is at a high level, the output signal Is1 Is Iinv 1; when the PWM1 signal Is low, the output signal Is1 ═ Iinv2, and switching multiplication Is achieved.
The low-pass filter Is used for performing low-pass filtering on the output signal Is1 of the multiplexer to obtain a phase detection signal Is 2; as shown in fig. 2, in this embodiment, the low-pass filter is composed of resistors R6 and R7, capacitors C1 and C2, and an operational amplifier U2, and its cutoff frequency f0 is 1/[2 pi × (R6 × R7 × C1 × C2) ^0.5], where the parameters of the resistors and capacitors are selected to ensure that the cutoff frequency of the low-pass filter is much lower than the resonant frequency of the inverter main circuit.
The phase detection signal Is2 Is used for indicating a phase difference between an inverter current and an inverter voltage of the main inverter circuit, and representing a matching degree between a switching frequency and a resonant frequency of the main inverter circuit, and the phase detection signal Is specifically as follows:
(1) is2 Is equal to 0, which represents that the inversion current and the inversion voltage have the same frequency and phase;
(2) is2<0, which indicates that the inversion current leads the phase of the inversion voltage, and the phase difference between the two meets 0 degrees < theta < -90 degrees;
(3) is2>0, indicating that the inversion current lags the inversion voltage phase, and the phase difference between the two satisfies 0 DEG < theta <90 deg.
As shown in fig. 1, in this embodiment, in order to improve the detection sensitivity of the phase difference between the inverter current and the inverter voltage of the inverter main circuit, the phase detection circuit further includes a phase detection conditioning circuit, and the phase detection conditioning circuit Is configured to perform differential amplification on a phase detection signal Is2 to obtain a phase detection conditioning signal Iso. As shown in fig. 2, in this embodiment, the phase detection conditioning circuit Is a differential amplifier composed of resistors R8, R9, R10, R11 and an operational amplifier U3, where R8 Is R9, R10 Is R11, the gain of the differential amplifier Is Gb Is R11/R9, and the phase detection conditioning signal Iso Is (Vref-Is2) × R11/R9, where the value of the reference signal Vref Is such that Vref ± Is2 Is within the analog input requirement range of the controller.
A typical waveform diagram of the phase detection circuit of the present embodiment is shown in fig. 3, which sequentially includes from top to bottom: the phase detection and conditioning circuit comprises an inverter current signal Is, two input signals Iinv1 and Iinv2 of a multiplexer, a channel selection signal PWM1, an output signal Is1 of the multiplexer, and a phase detection and conditioning signal Iso after the Is1 Is subjected to low-pass filtering and differential amplification.
As shown in fig. 1, in this embodiment, in order to implement synchronization between the switching frequency and the resonant frequency of the inverter main circuit, so as to improve the efficiency of the wireless charging transmitting terminal of the electric vehicle, the phase detection circuit further includes a controller, and after the phase detection conditioning signal Iso is obtained, the controller generates a driving signal of the inverter main circuit according to the magnitude relationship between Iso and Vref, so as to adjust the switching frequency of the inverter main circuit, and implement synchronization between the switching frequency and the resonant frequency, that is, implement frequency tracking. The frequency tracking control method Is shown in fig. 4 (for example, Iso ═ Vref-Is 2):
when Iso is equal to Vref, the inverter current and the inverter voltage are in the same frequency and phase, at the moment, frequency tracking is finished, and the controller outputs fixed driving frequency;
when the Iso is greater than the Vref, the driving frequency is increased (namely the switching frequency of the inverter main circuit is increased) through PI adjustment, so that the Iso is gradually close to the Vref, and the tracking of the switching frequency and the resonant frequency is realized;
when the Iso is less than the Vref, the driving frequency is reduced (namely the switching frequency of the inverter main circuit is reduced) through PI regulation, so that the Iso is gradually close to the Vref, and the tracking of the switching frequency and the resonant frequency is realized.
As another embodiment, after the phase detection signal Is2 Is obtained, the driving signal of the inverter main circuit Is generated according to the phase detection signal Is2 to adjust the switching frequency of the inverter main circuit, so that the phase difference between the inverter current and the inverter voltage Is gradually reduced until the phase difference approaches 0 °, and the switching frequency and the resonant frequency of the inverter main circuit can be synchronized. Specifically, when Is2<0, the phase difference Is reduced by increasing the switching frequency of the inverter main circuit; when Is2>0, the phase difference Is reduced by lowering the switching frequency of the inverter main circuit.
The phase detection circuit of this embodiment, when detecting the contravariant electric current of contravariant main circuit and the phase difference of contravariant voltage, only need gather contravariant electric current signal, need not gather contravariant voltage signal, compare with current phase-locked loop frequency tracking circuit, not only left out the voltage sampling circuit, do not adopt the phase-locked loop moreover, circuit structure is simple, and is with low costs. In addition, this embodiment utilizes phase detection to condition signal Iso and adjusts the switching frequency of contravariant main circuit, realizes switching frequency and resonant frequency's tracking, compares with utilizing phase detection signal Is2, because the detection of phase difference Is more sensitive, then realizes frequency tracking more in time, can improve the efficiency of the wireless transmitting terminal that charges of electric automobile more fast.
Claims (6)
1. A wireless charging phase detection circuit of electric automobile for realizing frequency tracking is characterized in that, this phase detection circuit includes: the sampling circuit, the sampling conditioning circuit, the multiplexer and the low-pass filter;
the sampling circuit is used for collecting an inversion current signal of an inversion main circuit of the wireless charging transmitting terminal of the electric automobile;
the sampling conditioning circuit is used for respectively carrying out forward amplification and reverse amplification on the inversion current signals to obtain two paths of output signals with phase difference of 180 degrees, and the two paths of output signals are used as two paths of input signals of the multiplexer;
the multiplexer is used for selecting one path from two paths of input signals of the multiplexer as an output signal according to a channel selection signal, and the channel selection signal is obtained by delaying a driving signal of an advanced bridge arm of the main inverter circuit by 90 degrees;
the low-pass filter is used for performing low-pass filtering on the output signal of the multiplexer to obtain a phase detection signal, and the cut-off frequency of the low-pass filter is far smaller than the resonance frequency of the inverter main circuit.
2. The wireless charging phase detection circuit of claim 1, further comprising a phase detection conditioning circuit, wherein the phase detection conditioning circuit is configured to differentially amplify the phase detection signal to obtain a phase detection conditioning signal.
3. The wireless charging phase detection circuit of claim 1, further comprising a controller, wherein the controller is configured to generate a driving signal of the inverter main circuit according to the phase detection signal, so that a switching frequency of the inverter main circuit is consistent with a resonant frequency.
4. The wireless charging phase detection circuit of claim 2, further comprising a controller, wherein the controller is configured to generate a driving signal of the main inverter circuit according to the phase detection conditioning signal, so that a switching frequency of the main inverter circuit is consistent with a resonant frequency.
5. The wireless charging phase detection circuit of the electric automobile according to claim 1 or 2, wherein the sampling circuit is a current transformer sampling circuit, a current hall sampling circuit, or a voltage dividing resistor sampling circuit.
6. The wireless charging phase detection circuit of claim 1 or 2, wherein the sampling conditioning circuit comprises a forward amplifier and a reverse amplifier, and the amplification factors of the two amplifiers are the same.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911078224.3A CN110954749B (en) | 2019-11-06 | 2019-11-06 | Electric automobile wireless charging phase detection circuit for realizing frequency tracking |
| PCT/CN2020/103132 WO2021088415A1 (en) | 2019-11-06 | 2020-07-20 | Electric vehicle wireless charging phase detection circuit for realizing frequency tracking |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911078224.3A CN110954749B (en) | 2019-11-06 | 2019-11-06 | Electric automobile wireless charging phase detection circuit for realizing frequency tracking |
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| CN110954749B true CN110954749B (en) | 2021-07-30 |
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| CN110954749B (en) * | 2019-11-06 | 2021-07-30 | 许继电源有限公司 | Electric automobile wireless charging phase detection circuit for realizing frequency tracking |
| CN111812430A (en) * | 2020-06-02 | 2020-10-23 | 南京瑞贻电子科技有限公司 | Power working condition Internet of things monitoring device and method based on artificial intelligence |
| CN115149912A (en) * | 2022-07-20 | 2022-10-04 | 普源精电科技股份有限公司 | Analog front end chip, analog front end circuit and signal processing device |
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| JPH06351261A (en) * | 1993-06-03 | 1994-12-22 | Fuji Electric Co Ltd | Phase detection method for output current of inverter |
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| US11376435B2 (en) * | 2007-07-20 | 2022-07-05 | Boston Scientific Neuromodulation Corporation | System and method for shaped phased current delivery |
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| CN109672343B (en) * | 2018-12-17 | 2020-12-18 | 华为技术有限公司 | Phase calibration circuit and method of receiving end and receiving end |
| CN110954749B (en) * | 2019-11-06 | 2021-07-30 | 许继电源有限公司 | Electric automobile wireless charging phase detection circuit for realizing frequency tracking |
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| JPH06351261A (en) * | 1993-06-03 | 1994-12-22 | Fuji Electric Co Ltd | Phase detection method for output current of inverter |
| CN103163374A (en) * | 2011-12-09 | 2013-06-19 | 中国北车股份有限公司大连电力牵引研发中心 | Detection method and detection device for locomotive synchronizing signal phase, power supply system and electric locomotive |
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| CN109327065A (en) * | 2018-12-06 | 2019-02-12 | 华为技术有限公司 | Receiving end, method, electric terminal, transmitting terminal and the system of wireless charging system |
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