CN111413538B - Detection circuit and detection method for bridge-free topology current zero-crossing point at wireless charging receiving side - Google Patents
Detection circuit and detection method for bridge-free topology current zero-crossing point at wireless charging receiving side Download PDFInfo
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Abstract
The invention discloses a bridge-free topology current zero-crossing detection circuit and method for a wireless charging receiving side, wherein the input end of the detection circuit is connected with a source electrode and a drain of a bridge-free topology switch MOS tube, and the detection circuit comprises: the voltage division module, the isolation module, the filtering module and the edge detection module are sequentially connected in series; the voltage division module is used for dividing the pulse signals of the switch MOS tube; the isolation module is used for converting the pulse signal output by the voltage division module into an isolated pulse signal; the filtering module is used for filtering high-frequency components in the pulse signals output by the isolation module; the edge detection module is used for detecting the falling edge pulse of the pulse signal output by the filtering module to obtain a bridgeless topology input current zero crossing point signal. The detection of the current zero crossing point is realized by detecting the D, S falling edge by utilizing the characteristic that the current zero crossing point time of the bridgeless circuit at the wireless charging receiving side coincides with the falling edge time of the switch MOS tube D, S, the false operation caused by a plurality of zero crossing points in direct detection is avoided, and the detection cost is reduced.
Description
Technical Field
The invention belongs to the technical field of wireless charging, and particularly relates to a bridge-free topology current zero-crossing detection circuit and a bridge-free topology current zero-crossing detection method on a wireless charging receiving side.
Background
Wireless charging is to use electromagnetic induction type, magnetic coupling resonance type, etc. to transfer energy from one device to another device through a non-contact coil. Compared with traditional wired charging, wireless charging has the advantages of high reliability, strong environmental adaptability, full-automatic unattended operation and the like, and is developed briskly in the fields of unmanned driving of new energy electric vehicles, unmanned aerial vehicles and the like. The whole set of wireless charging system comprises five parts, namely transmitting side equipment, a transmitting side coil, a receiving side coil, receiving side equipment and a load, wherein the receiving side equipment is equipment for converting alternating current into direct current. According to the research results of the existing colleges and universities, enterprise units and scientific research institutions, the efficiency of a wireless charging system with an active rectification receiving side can reach more than 90%, except for the resistance loss of the system, the reactive component in the system is an important factor for limiting the energy transmission of the system to a load side, so that for the wireless charging system with the active rectification, a phase-locking link plays an important role in adjusting the reactive component in the system, the detection of the zero crossing point of current is a common method for realizing phase locking in practical application, and the rapidness and the accuracy of the detection of the zero crossing point of current have important influences on the dynamic performance and the control precision of the system.
Currently, for an active rectification wireless charging system, current zero-crossing point detection is mostly achieved by directly sampling current, comparing the sampled current with reference current to obtain a pulse waveform containing a current zero-crossing point, and detecting an edge of the pulse waveform to obtain a synchronous pulse of the current zero-crossing point.
The method for directly sampling the current to obtain the current zero-crossing phase has very high requirements on current waveforms, can well detect the zero-crossing phase information of the current when the current is a standard sine wave, but has a plurality of zero-crossing phenomena when the current has interference and higher harmonics and the wireless charging coupling mechanism is an asymmetric parameter, and can detect a plurality of zero points when the zero points of the current are directly detected, thereby causing misoperation of the system; in addition, the frequency of wireless charging is 85kHz mostly, the bandwidth of the hall can meet the requirement of current sampling frequency, and the cost of the device can be increased by using the hall device to sample the current.
Disclosure of Invention
The invention is mainly used for solving the problem that a plurality of zero-crossing points exist in the current zero-crossing point sampling of the wireless charging receiving side in the bridgeless topology, the phase relation of the circuit voltage and the circuit current is found by analyzing the characteristics of the bridgeless circuit, and a hardware circuit is built according to the characteristics of the circuit, so that the effect of current zero-crossing point detection is achieved, and the problem of interference zero-crossing points in the direct detection of the current zero-crossing points can be effectively solved.
In order to achieve the above object, a first aspect of the present invention provides a bridge-free topology current zero-crossing point detection circuit on a wireless charging receiving side, wherein an input end of the current zero-crossing point detection circuit is respectively connected to a source and a drain of a switching MOS transistor of the bridge-free topology, and the circuit includes: the voltage division module, the isolation module, the filtering module and the edge detection module are sequentially connected in series;
the voltage division module is used for dividing the pulse signal of the switch MOS tube;
the isolation module is used for converting the pulse signal output by the voltage division module into an isolated pulse signal;
the filtering module is used for filtering out high-frequency components in the pulse signals output by the isolating module;
the edge detection module is used for detecting falling edge pulses of the pulse signals output by the filtering module to obtain input current falling zero-crossing signals of the bridgeless topology, and advancing the input current falling zero-crossing signals by T/2 periods to obtain input current rising zero-crossing signals.
Further, the voltage dividing module comprises a series unit and a parallel unit which are connected in series;
the series unit comprises a plurality of first RC subunits connected in series, and each first RC subunit comprises a first voltage division resistor and a first voltage division capacitor connected in parallel;
the parallel unit comprises a plurality of second RC subunits connected in parallel, and each second RC subunit comprises a second voltage division resistor and a second voltage division capacitor connected in parallel;
the input end of the voltage division module is the end of the series unit far away from the parallel unit, and the output end of the voltage division module is the end of the series unit close to the parallel unit.
Further, the bridge-free topology current zero-crossing point detection circuit on the wireless charging receiving side further includes: the comparison module is arranged between the voltage division module and the isolation module;
the comparison module is used for converting the pulse signal with fluctuating amplitude output by the voltage division module into a pulse signal with fixed amplitude.
Further, the comparison module comprises: the comparator comprises a first comparison resistor, a second comparison resistor and a comparator;
the input end of the comparison module is connected with the positive input end of the comparator, and the output end of the comparison module is connected with the output end of the comparator;
the first comparison resistor is respectively connected with a first reference voltage source and the negative input end of the comparator;
one end of the second comparison resistor is connected with the negative input end of the comparator, and the other end of the second comparison resistor is grounded.
Further, the isolation module includes: photoelectric isolation or magnetic isolation.
Further, the isolation module is a photoelectric isolation module, including: the device comprises a first isolation resistor, a second isolation resistor, a third isolation resistor, a fourth isolation resistor and an optical coupling isolation chip;
one end of the first isolation resistor is connected with the second isolation resistor and the third isolation resistor, and the other end of the first isolation resistor is connected with a second reference voltage source;
the other end of the second isolation resistor is grounded;
the other end of the third isolation resistor is connected with the input end of the optical coupling isolation chip;
one end of the fourth isolation resistor is connected with the output end of the optical coupling isolation chip, and the other end of the fourth isolation resistor is connected with a third reference voltage source;
the input end of the isolation module is connected with one end, far away from the optical coupling isolation chip, of the third isolation resistor, and the output end of the isolation module is connected with the output end of the optical coupling isolation chip.
Further, the isolation module further comprises: a first clamping diode and a second clamping diode;
the anode of the first clamping diode is connected with the output end of the optical coupling isolation chip, and the cathode of the first clamping diode is connected with a fourth reference voltage source;
and the cathode of the second clamping diode is connected with the output end of the optical coupling isolation chip, and the anode of the second clamping diode is grounded.
Further, the filtering module includes: a filter resistor and a filter capacitor;
the filter resistor is respectively connected with the input end and the output end of the filter module;
one end of the filter capacitor is connected with the output end of the filter module, and the other end of the filter capacitor is grounded.
Further, the zero crossing time of the input current of the bridgeless topology is the same as the falling edge time of the voltage at two ends of the switching MOS tube.
The second aspect of the present invention provides a method for detecting a zero crossing point of a bridgeless topology current at a wireless charging receiving side, which is used for controlling any one of the bridgeless topology current zero crossing point detection circuits at the wireless charging receiving side, and the method includes the following steps:
acquiring original voltage signals at two ends of a switch MOS tube of a wireless charging receiving side bridgeless topology;
carrying out voltage division processing on the original voltage signal to obtain a first pulse signal;
isolating the first pulse signal to obtain a second pulse signal;
filtering the second pulse signal, and filtering a high-frequency component in the second pulse signal to obtain a third pulse signal;
and detecting the falling edge of the third pulse signal to obtain an input current falling zero-crossing signal of the switch MOS tube, and advancing the input current falling zero-crossing signal by T/2 periods to obtain an input current rising zero-crossing signal.
The technical scheme is applied to the wireless charging receiving side and is of a bridgeless topological structure, requirements are provided for a circuit of a coupling mechanism of the wireless charging receiving side, direct sampling of wireless charging current is not needed, the characteristic that the current zero crossing point time of the bridgeless circuit of the wireless charging receiving side coincides with the falling edge time of a switch MOS tube D, S is utilized, the falling edges of D, S at two ends of the switch MOS tube are detected, detection of the current zero crossing point of the bridgeless circuit is achieved, compared with a traditional current Hall method, misoperation caused by the fact that multiple zero crossing points exist in direct current detection is avoided, and cost is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a wireless charging system topology suitable for a bridge-free topology current zero-crossing detection circuit of a wireless charging receiving side according to the present invention;
fig. 2 is a topology circuit diagram of a wireless charging system suitable for the bridge-free topology current zero-crossing detection circuit of the wireless charging receiving side of the present invention;
fig. 3 is a voltage and current waveform diagram of a wireless charging receiver device according to an embodiment of the invention;
fig. 4 is a simplified block diagram of a bridge-less topology current zero-crossing detection circuit on the wireless charging receiving side in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a detection circuit for a bridge-free topology current zero crossing point at a wireless charging receiving side according to an embodiment of the present invention;
fig. 6 is a voltage and current waveform diagram of each module node of the bridge-free topology current zero-crossing point detection circuit on the wireless charging receiving side in the embodiment of the invention;
fig. 7 is a flowchart of a method for detecting a bridge-free topology current zero crossing point at a wireless charging receiving side in an embodiment of 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 in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The features and properties of the present invention are described in further detail below with reference to examples.
Fig. 1 is a schematic diagram of a wireless charging system topology suitable for the bridge-free topology current zero-crossing detection circuit on the wireless charging receiving side of the present invention.
Referring to fig. 1, the wireless charging system topology is composed of five parts, namely a transmitting-side device, a transmitting-side coupling mechanism, a receiving-side device and a load.
The transmitting side device is mainly a full-bridge inverter circuit or can be in a half-bridge structure.
The transmitting side coupling mechanism is composed of four parts of elements, namely a compensation inductor 001, a parallel compensation capacitor 002, a series compensation capacitor 003 and a primary side inductor 004, wherein the primary side inductor 004 is a necessary element, the compensation inductor 001, the parallel compensation capacitor 002 and the series compensation capacitor 003 are optional elements, and one to three of the optional elements can be contained according to the actual circuit requirement of a transmitting side coil.
The receiving side coupling mechanism also comprises a secondary coil 005, a series compensation capacitor 006, a parallel compensation capacitor 007 and a compensation inductor L rs Four parts, secondary coil 005 and secondary compensation inductance L rs The secondary series compensation capacitor 006 and the parallel compensation capacitor 007 are optional elements as necessary elements, and one or two of the optional elements may be included according to the actual circuit requirement of the receiving side coil.
The transmitting side coupling mechanism and the receiving side coupling mechanism jointly form a plurality of symmetrical or asymmetrical wireless charging coupling mechanism topologies, and the transmitting side coupling mechanism is connected with a compensation capacitor 002 and a primary coil 004 in parallel and a secondary coil 005, a series compensation capacitor 006 and a secondary compensation inductor L in the receiving side coupling mechanism in parallel rs The wireless charging system is formed into a parallel-series (P-S) topology, and also comprises a topology of mainstream wireless charging coupling mechanisms such as S-S, LCC-S, S-LCC, LCC-LCC, S-LCL, LCL-S and LCL-LCL.
The receiving side equipment comprises a bridge circuit, the upper half of the bridge circuitPart is diode, the lower half part is switch MOS tube, the bridge circuit of receiving side and L in the coupling mechanism of receiving side rs The compensation inductors jointly form a receiving-side bridgeless topology.
The load mainly comprises a resistor and a battery load.
Fig. 2 is a topology circuit diagram of a wireless charging system suitable for the bridge-free topology current zero-crossing detection circuit of the wireless charging receiving side of the present invention.
Referring to fig. 2, the transmitting side and the receiving side jointly form a dual-sided LCC coupling mechanism, and S in the receiving side device 21 、S 23 Is a diode, S 22 、S 24 Is a switching MOS tube.
Fig. 3 is a waveform diagram of voltage and current of a wireless charging receiver according to an embodiment of the invention.
FIG. 3 is a diagram showing voltage and current waveforms in each power transistor of a receiving side device when a dual-side LCC wireless charging system operates, and the current i is generated due to the existence of a diode s Always remains at zero at time t1, i.e. current i at time t1 s Zero crossing at descent; it can also be known from the time-sequence waveform diagram of the current that the current i s MOS transistor S with same switch for zero crossing point during descending 22 Two ends V ds The voltage falling edge of the switch is always kept consistent at the moment t1, namely, the MOS transistor S can be switched on and off 22 Two ends V ds The falling edge of the voltage can obtain the zero-crossing point information of the current.
Fig. 4 is a simplified block diagram of a bridge-free topology current zero-crossing detection circuit on a wireless charging receiving side according to an embodiment of the present invention.
Referring to fig. 4, a first aspect of the embodiment of the present invention provides a bridge-free topology current zero crossing point detection circuit on a wireless charging receiving side, where an input end of the current zero crossing point detection circuit is connected to a source and a drain of a switch MOS transistor of the bridge-free topology, respectively, and the current zero crossing point detection circuit includes: the device comprises a voltage division module, an isolation module, a filtering module and an edge detection module which are sequentially connected in series.
The voltage division module is used for dividing the voltage of the pulse signal of the switch MOS tube, the pulse voltage with large amplitude values at two ends of the switch MOS tube is converted into the pulse voltage with small voltage amplitude value, and the influence of the stray parameters of the device on the pulse voltage sampling is considered in the design of the voltage division circuit.
The isolation module is used for converting the pulse signal output by the comparison module into an isolated pulse signal and converting a low-voltage signal obtained by the power loop into an isolated low-voltage signal, and the isolation circuit is required to have good dynamic performance, stronger common mode rejection capability and very high corresponding speed. Optionally, the isolation module includes: photoelectric isolation or magnetic isolation.
The filter module is used for filtering high-frequency components in the pulse signals output by the isolation module and filtering high-frequency components in the pulse voltages obtained by the isolation module, the delay influence of the circuit on the pulse voltages is considered in the design of the filter module, and the accuracy of current zero crossing point detection is greatly reduced due to the existence of delay, so that the filter circuit plays a role in compensating phase errors.
The edge detection module is used for detecting falling edge pulses of the pulse signals output by the filtering module to obtain input current falling zero-crossing signals of the bridgeless topology, and advancing the input current falling zero-crossing signals by T/2 periods to obtain input current rising zero-crossing signals to obtain synchronous signals of the bridgeless topology input current.
Optionally, the bridge-free topology current zero-crossing point detection circuit at the wireless charging receiving side further includes: and the comparison module is arranged between the voltage division module and the isolation module. The comparison module is used for converting the pulse signal with the fluctuating amplitude output by the voltage division module into the pulse signal with the fixed amplitude, and can convert the pulse voltage with the fluctuating amplitude in a certain range obtained by the voltage division module into the pulse voltage with the constant voltage amplitude.
Fig. 5 is a schematic diagram of a bridge-free topology current zero-crossing point detection circuit on a wireless charging receiving side in an embodiment of the invention.
Referring to fig. 5, a specific implementation manner of the bridge-free topology current zero crossing point detection circuit on the wireless charging receiving side is as follows:
specifically, the voltage division module comprises a series unit and a parallel unit which are connected in series. Wherein the series unit comprises a plurality of series-connected first RC subunitsThe element comprising a first voltage dividing resistor R connected in parallel d And a first voltage-dividing capacitor C d (ii) a The parallel unit comprises a plurality of second RC subunits connected in parallel, and the second RC subunits comprise second voltage-dividing resistors R connected in parallel p And a second voltage dividing capacitor C p . The input end of the voltage division module is one end of the series unit far away from the parallel unit, and the output end of the voltage division module is one end of the series unit close to the parallel unit.
Specifically, the comparison module includes: first comparison resistor R 1 A second comparison resistor R 2 And a comparator U 1 . Input end of comparison module and comparator U 1 The output end of the comparison module is connected with a comparator U 1 Is connected with the output end of the power supply. First comparison resistor R 1 Are respectively connected with a first reference voltage source V g1 And a negative input of the comparator. Second comparison resistor R 2 One end of the comparator is connected with the negative input end of the comparator, and the other end of the comparator is grounded.
Specifically, when adopting the optoelectronic isolation mode, the isolation module includes: first isolation resistor R 3 A second isolation resistor R 4 A third isolation resistor R 5 A fourth isolation resistor R 6 And optical coupling isolation chip U 2 . Wherein, the first isolation resistor R 3 One end of the resistor is connected with the second isolation resistor R 4 And a third isolation resistor R 5 Is connected at the other end with a second reference voltage source V g2 Connecting; second isolation resistor R 4 The other end is grounded; third isolation resistor R 5 The other end is isolated from the optical coupler by a chip U 2 The input ends of the two-way valve are connected; fourth isolation resistor R 6 One end of the optical coupler is isolated from the chip U 2 Is connected with the output end of the first voltage source, and the other end of the first voltage source is connected with a third reference voltage source V g3 Connecting; input end of isolation module and third isolation resistor R 5 Keep away from opto-coupler isolation chip U 2 Is connected with one end of the optical coupler isolation chip U, and the output end of the optical coupler isolation chip U 2 Is connected with the output end of the power supply.
Specifically, the isolation module further includes: first clamping diode D 1 And a second clamping diode D 2 . Wherein the first clamping diode D 1 Positive pole and optical coupling isolating coreSlice U 2 Is connected with the output end of the first voltage source, and the negative electrode of the first voltage source is connected with a fourth reference voltage source V g4 Connecting; second clamping diode D 2 Negative pole and opto-coupler isolation chip U 2 The output end of the power supply is connected, and the anode of the power supply is grounded.
Specifically, the filtering module includes: filter resistance R 7 And a filter capacitor C 1 . Wherein, the filter resistor R 7 Are respectively connected with the input end and the output end of the filtering module; filter capacitor C 1 One end of the filter module is connected with the output end of the filter module, and the other end of the filter module is grounded.
Specifically, the edge detection module includes: first D flip-flop U 3 Second D flip-flop U 4 NOT gate circuit U 5 AND gate circuit U 6 A falling edge detection circuit is formed together, and Clk is a D trigger U 3 And a second D flip-flop U 4 The synchronous clock signal of (2); when the voltage V at two ends of the power tube ds Is changed into V by a filter circuit so To the input of a D flip-flop, a second D flip-flop U 4 Output and AND gate circuit U 6 The output remains high, V so After the low level of (3) is reached, the first D flip-flop U 3 High level is output through NOT gate, AND gate circuit U 6 The output of the power tube is changed into high level, namely the power tube V is obtained ds Pulse sequence V at the time of the falling edge neg_edge 。
As shown in FIG. 5, the voltage across the power tube is V ds Obtaining a pulse voltage signal V by voltage division of the voltage division module sv Then voltage V ds And V sv Gain in between is G vd (s)：
Wherein, the first and the second end of the pipe are connected with each other,
when R is pn C pn ＝R pm C pm When the utility model is used, the water is discharged,
in the comparison module, by adjusting R 1 And R 2 A voltage V can be obtained sc Voltage V of sc Pulse voltage V obtained by same voltage division module sv Through a comparator U 1 The comparison result shows that the output voltage has a certain amplitude and the same phase as V sv Opposite pulse signal passing through optical coupling isolation chip U 2 And a clamping diode D 1 、D 2 Eliminating positive or negative peak in pulse voltage, and regulating delay caused by sampling by a first-stage RC filtering module to obtain signal V so And voltage V at two ends of the switch MOS tube ds The signal frequencies are consistent and the phases are the same.
Voltage V obtained by sampling circuit so The voltage V is obtained by the edge detection module ds Is a falling edge pulse V neg_edge Falling edge pulse V neg_edge The left shift is T/2 cycles is the current i s Of the synchronization signal i s_syn 。
In any of the above-mentioned wireless charging receiving side bridgeless topology current zero-crossing detection circuits, the input current zero-crossing time of the bridgeless topology is the same as the voltage falling edge time at both ends of the switch MOS transistor.
Fig. 6 is a voltage and current waveform diagram of each module node of the bridge-free topology current zero-crossing point detection circuit on the wireless charging receiving side in the embodiment of the present invention.
Referring to FIG. 6, the voltage V at both ends of the MOS transistor is switched ds The falling edge time is always the same as the current i s Coincidence of zero crossing points in descent, V neg_edge The signal is always at the same voltage V ds Falling edge synchronization, i s_syn Signal lead V neg_edge The signal T/2 cycles, as can be seen from the figure, at T 0 At time, current i s Zero crossing point in rising is the same as i s_syn The signals are synchronized.
Fig. 7 is a flowchart of a method for detecting a zero crossing point of a bridgeless topology current at a wireless charging receiving side according to an embodiment of the present invention.
Referring to fig. 7, a second aspect of the embodiment of the present invention provides a method for detecting a zero crossing point of a bridgeless topology current at a wireless charging receiving side, where any one of the bridgeless topology current zero crossing point detection circuits at the wireless charging receiving side is used for detection, and the method includes the following steps:
s100, original voltage signals at two ends of a switch MOS tube of a wireless charging receiving side bridgeless topology are obtained.
S200, carrying out voltage division processing on the original voltage signal to obtain a first pulse signal.
S300, isolating the first pulse signal to obtain a second pulse signal.
And S400, filtering the second pulse signal, and filtering high-frequency components in the second pulse signal to obtain a third pulse signal.
And S500, detecting the falling edge of the third pulse signal to obtain a falling zero-crossing point signal of the input current of the switch MOS tube. And advancing the input current falling zero-crossing point signal by T/2 periods to obtain an input current rising zero-crossing point signal.
The embodiment of the invention discloses a bridge-free topological current zero-crossing detection circuit and a detection method for a wireless charging receiving side, wherein the technical scheme has the following technical effects: the detection of the current zero crossing point of the bridgeless circuit is realized by utilizing the characteristic that the current zero crossing point time of the bridgeless circuit at the wireless charging receiving side coincides with the falling edge time of the switch MOS tube D, S and detecting the falling edges of D, S at the two ends of the switch MOS tube.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. The utility model provides a wireless receiving side of charging does not have bridge topology current zero crossing detection circuit which characterized in that, the input of current zero crossing detection circuit respectively with the source electrode and the drain electrode of switch MOS pipe of no bridge topology is connected, includes: the voltage division module, the isolation module, the filtering module and the edge detection module are sequentially connected in series;
the voltage division module is used for dividing the pulse signal of the switch MOS tube;
the isolation module is used for converting the pulse signal output by the voltage division module into an isolated pulse signal;
the filtering module is used for filtering out high-frequency components in the pulse signals output by the isolating module;
the edge detection module is used for detecting falling edge pulses of the pulse signals output by the filtering module to obtain input current falling zero-crossing signals of the bridgeless topology, and advancing the input current falling zero-crossing signals by T/2 periods to obtain input current rising zero-crossing signals;
the voltage division module comprises a series unit and a parallel unit which are connected in series;
the series unit comprises a plurality of first RC subunits connected in series, and each first RC subunit comprises a first voltage division resistor and a first voltage division capacitor connected in parallel;
the parallel unit comprises a plurality of second RC subunits connected in parallel, and each second RC subunit comprises a second voltage division resistor and a second voltage division capacitor connected in parallel;
the input end of the voltage division module is the end of the series unit far away from the parallel unit, and the output end of the voltage division module is the end of the series unit close to the parallel unit.
2. The bridge-free topology current zero-crossing detection circuit on the wireless charging receiving side according to claim 1, further comprising: the comparison module is arranged between the voltage division module and the isolation module;
the comparison module is used for converting the pulse signal with the fluctuating amplitude output by the voltage division module into a pulse signal with a fixed amplitude.
3. The wireless charging receiving side bridgeless topology current zero-crossing detection circuit according to claim 2, wherein the comparison module comprises: the circuit comprises a first comparison resistor, a second comparison resistor and a comparator;
the input end of the comparison module is connected with the negative input end of the comparator, and the output end of the comparison module is connected with the output end of the comparator;
the first comparison resistor is respectively connected with a first reference voltage source and the positive input end of the comparator;
one end of the second comparison resistor is connected with the anode input end of the comparator, and the other end of the second comparison resistor is grounded.
4. The wireless charging receiving side bridgeless topology current zero-crossing detection circuit according to claim 1,
the isolation module includes: photoelectric isolation or magnetic isolation.
5. The wireless charging receiving side bridgeless topology current zero-crossing detection circuit according to claim 4, wherein the isolation module is a photoelectric isolation module, and comprises: the device comprises a first isolation resistor, a second isolation resistor, a third isolation resistor, a fourth isolation resistor and an optical coupling isolation chip;
one end of the first isolation resistor is connected with the second isolation resistor and the third isolation resistor, and the other end of the first isolation resistor is connected with a second reference voltage source;
the other end of the second isolation resistor is grounded;
the other end of the third isolation resistor is connected with the input end of the optical coupling isolation chip;
one end of the fourth isolation resistor is connected with the output end of the optical coupling isolation chip, and the other end of the fourth isolation resistor is connected with a third reference voltage source;
the input end of the isolation module is connected with one end, far away from the optical coupling isolation chip, of the third isolation resistor, and the output end of the isolation module is connected with the output end of the optical coupling isolation chip.
6. The wireless charging receiving side bridgeless topology current zero-crossing detection circuit according to claim 5, wherein the isolation module further comprises: a first clamping diode and a second clamping diode;
the anode of the first clamping diode is connected with the output end of the optical coupling isolation chip, and the cathode of the first clamping diode is connected with a fourth reference voltage source;
and the cathode of the second clamping diode is connected with the output end of the optical coupling isolation chip, and the anode of the second clamping diode is grounded.
7. The wireless charging receiving side bridgeless topology current zero-crossing detection circuit according to claim 1, wherein the filtering module includes: a filter resistor and a filter capacitor;
the filter resistor is respectively connected with the input end and the output end of the filter module;
one end of the filter capacitor is connected with the output end of the filter module, and the other end of the filter capacitor is grounded.
8. The wireless charging receiving side bridgeless topology current zero-crossing detection circuit according to any one of claims 1 to 7,
and the zero crossing time of the input current of the bridgeless topology is the same as the falling edge time of the voltage at two ends of the switch MOS tube.
9. A method for detecting a zero crossing point of a wireless charging receiving side bridgeless topology current, which is used for controlling the wireless charging receiving side bridgeless topology current zero crossing point detection circuit of any one of claims 1-8, and comprises the following steps:
acquiring original voltage signals at two ends of a switch MOS tube of a wireless charging receiving side bridgeless topology;
performing voltage division processing on the original voltage signal to obtain a first pulse signal;
isolating the first pulse signal to obtain a second pulse signal;
filtering the second pulse signal, and filtering out a high-frequency component in the second pulse signal to obtain a third pulse signal;
and detecting the falling edge of the third pulse signal to obtain an input current falling zero-crossing signal of the switch MOS tube, and advancing the input current falling zero-crossing signal by T/2 periods to obtain an input current rising zero-crossing signal.
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| CN116260228B (en) * | 2023-05-16 | 2023-10-27 | 深圳市高斯宝电气技术有限公司 | Battery in-place detection circuit for digital power supply and charging control method thereof |
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| CN103063904A (en) * | 2012-12-30 | 2013-04-24 | 青岛东软载波科技股份有限公司 | Zero cross detection circuit |
| CN104237615B (en) * | 2013-06-09 | 2019-03-12 | 中兴通讯股份有限公司 | Current over-zero detection device, signal acquisition circuit and circuit system |
| CN103743940B (en) * | 2014-01-24 | 2016-03-09 | 镇江天力变压器有限公司 | A kind of zero cross detection circuit of the power supply of high-frequency dust removing accurately resonance current |
| CN206627563U (en) * | 2017-03-13 | 2017-11-10 | 广东华美骏达电器有限公司 | A kind of zero cross detection circuit |
| CN107831357A (en) * | 2017-11-27 | 2018-03-23 | 深圳市锐钜科技有限公司 | Single-phase alternating current zero cross detection circuit and detection method based on light-coupled isolation |
| CN109462918B (en) * | 2019-01-07 | 2023-09-05 | 横店集团得邦照明股份有限公司 | LED driver based on Internet of things technology and implementation method thereof |
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