CN110138063B - Matching recognition system and method based on medium-high power wireless charging equipment - Google Patents
Matching recognition system and method based on medium-high power wireless charging equipment Download PDFInfo
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- CN110138063B CN110138063B CN201910439762.4A CN201910439762A CN110138063B CN 110138063 B CN110138063 B CN 110138063B CN 201910439762 A CN201910439762 A CN 201910439762A CN 110138063 B CN110138063 B CN 110138063B
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- H02J5/005—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- 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
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- H02J7/025—
Abstract
The invention discloses a matching recognition system and a method based on medium-high power wireless charging equipment, wherein the matching recognition system comprises wireless transmitting equipment and wireless receiving equipment, the wireless receiving equipment comprises a receiving coil, a receiving control device and a rechargeable battery, the receiving control device comprises a zero-crossing detection circuit, a zero-crossing control circuit, a relay control circuit and the like, the zero-crossing detection circuit is used for detecting the state of energy received by a receiving end to judge whether the energy enters a charging area or not, the zero-crossing control circuit is used for realizing intermittent control of zero-crossing detection time, and the relay control circuit is used for controlling the on-off of the receiving control device and the battery to realize zero-power consumption control; according to the scheme provided by the invention, when the receiving end enters the charging area, the transmitting end can be ensured to quickly enter a normal energy transmitting state required by charging of the receiving end, and when the receiving end leaves the charging area, the transmitting end is ensured to quickly enter a low standby state, the receiving end enters a zero-power-consumption standby state, so that the matching can be quickly identified, and meanwhile, the low-power-consumption wireless charging is realized.
Description
Technical Field
The invention belongs to the field of wireless charging, and particularly relates to a matching recognition system and a matching recognition method based on medium-high power wireless charging equipment.
Background
With the transition of the times and the progress of science and technology, robots have become a great trend to replace people. Because of intelligent needs, products such as AGVs, inspection robots, electric forklifts, logistics robots, rail robots and the like are widely used for wireless charging. The wireless charging device is different from the wired charging device in that the wireless charging device is charged by rated charging current when being started, because the topology structure and the safety of the wireless charging system are problems, the wireless charging device is usually charged by adjusting the current from zero to the rated current gradually in a frequency modulation mode. For medium-high power wireless charging equipment, the short-distance QI standard carrier communication is also quite different from that of mobile phones and the like, because the medium-high power wireless charging distance is quite large (usually 0-30 cm), wireless communication modes such as 433M, 2.4G and Bluetooth are generally adopted for closed-loop control of state information. The communication distance of 2.4G or 433G is generally far, the distance is tens of meters, and the distance is more than kilometers, so that in the charging process, if the charging equipment moves and leaves, the transmitting and receiving can still transmit data through wireless communication, and the system is easy to misjudge and perform reactive power control.
At present, most of power sources used by industrial equipment are 24V+ batteries, when matching identification is carried out, whether the receiving equipment enters a charging area is judged by monitoring battery information, when a transmitting end stands by before battery charging, a transmitting end generally transmits a driving signal for whether a receiving coil is in an effective range of energy transmission of the transmitting coil, and judging basis is detected whether voltage and current signals are received by the receiving end or not, so that power consumption of the transmitting end is relatively large when the receiving coil is not in an effective distance. During charging, if the charging device moves, leaves, tilts, and the charging distance changes, the magnetic field transmission matching of the system changes. Because the battery is always connected with the output of the receiving end, the voltage detected by the receiving end is generally the battery voltage, and therefore, when the system state is changed, the voltage change of the battery is smaller. If the system is controlled only according to the voltage, current and other data fed back by the receiving end, misjudgment of the transmitting end is easily caused, and the state of the transmitting end is easily changed.
In addition, the mode needs to generate driving power higher than battery voltage to generate charging current, and whether the receiving equipment enters a charging area or not is judged through the current, so that the power consumption of the transmitting equipment is relatively large, and meanwhile misjudgment is easy to cause; in addition, after the wireless charging equipment enters a charging area, charging currents in two states before charging is started and when the wireless charging equipment leaves the charging area for standby are zero, and misjudgment is easily caused by judging whether the receiving equipment enters the charging area or not through the charging currents; furthermore, when the transmitting device transmits energy in an intermittent state, if the receiving device control circuit acquires the charging state by acquiring the battery information, the receiving end is required to acquire a signal higher than the battery voltage to detect when the charging distance is larger, and then the transmitting device is caused to intermittently transmit energy, so that the power consumption is larger.
Disclosure of Invention
Aiming at the defects that the prior wireless charging system is easy to cause misjudgment and high in power consumption and the like during matching identification, the invention provides a matching identification system and a method based on medium-high power wireless charging equipment, which can rapidly perform automatic identification, system matching and departure detection of transmitting and receiving equipment during charging.
The invention is realized by adopting the following technical scheme:
the invention discloses a matching identification system based on medium-high power wireless charging equipment, which comprises wireless transmitting equipment and wireless receiving equipment, wherein the wireless transmitting equipment comprises a transmitting coil and a transmitting control device, the wireless receiving equipment comprises a receiving coil, a receiving control device and a rechargeable battery, the receiving control device and the transmitting control device are in wireless communication for information transmission, the receiving coil is connected with the rechargeable battery through a rectifying circuit and a filter circuit, the receiving coil receives energy sent by the transmitting coil and converts the energy into direct current through the rectifying circuit, the direct current is electrically connected to the rechargeable battery for charging after the filtering treatment, and the receiving control device also comprises a battery voltage detection circuit and a charging current detection circuit which are connected with a main control MCU and the rechargeable battery for detecting battery voltage and charging current;
the receiving control device comprises a main control MCU, a zero crossing detection circuit, a zero crossing control circuit, a relay control circuit and a power supply circuit, wherein the power supply circuit is used for providing power for the receiving control device, and the power supply circuit is positioned behind the filter circuit and in front of a relay contact switch of the relay control circuit, and is disconnected with a battery through the relay control circuit when not charged, so that the power supply circuit is in a power-down state; the MCU is a control center of the wireless receiving equipment, and realizes zero-crossing signal detection and control of the wireless receiving equipment; the input end of the zero-crossing detection circuit is connected with the rectification circuit, and the output end of the zero-crossing detection circuit is connected with the control port of the main control MCU through the zero-crossing control circuit and is used for detecting the state of energy received by the wireless receiving equipment; the zero-crossing control circuit is used for intermittently controlling the time of zero-crossing detection when the charging current is zero, avoiding low software operation efficiency caused by frequent interruption of the main control MCU, the relay control circuit is connected between the power supply circuit and the control port of the main control MCU, and the relay contact switch is connected between the battery and the filter circuit, so as to realize the on-off of the receiving control device and the battery and further realize zero standby power consumption control when the charging is not performed.
Furthermore, the zero-crossing detection circuit adopts the high-speed optocoupler U1 to perform zero-crossing detection, and the input end of the high-speed optocoupler U1 is electrically connected to the rectifying circuit through the current-limiting resistor R1.
Further, the zero-crossing control circuit comprises a triode Q1, a current-limiting resistor R2, a pull-up resistor R3 and a current-limiting resistor R4, the output end of the zero-crossing detection circuit is electrically connected to the collector of the control triode Q1, the emitter of the triode Q1 is connected to an external interrupt interface I/O-1 of the main control MCU through the current-limiting resistor R2, the pull-up resistor R3 is connected between the resistor R2 and the external interrupt interface I/O-1, and the base of the triode Q1 is electrically connected to a common I/O-2 port of the main control MCU through the resistor R4.
Further, the relay control circuit comprises a triode Q2, a relay K1 and a resistor R5, wherein the base electrode of the triode Q2 is connected with a common I/O-3 port of the main control MCU through the resistor R5, the emitting electrode of the triode Q2 is grounded, the collecting electrode of the triode Q2 is connected with one end of a coil of the relay K1, and the other end of the coil of the relay K1 is connected with a VCC power supply.
Further, for the zero-crossing control circuit, intermittent zero-crossing detection is performed when the charging current is equal to or less than a set value, the transistor Q1 is controlled to be turned on at intervals of t1, zero-crossing detection is performed, the duration of the zero-crossing detection is t2, and when the charging current is greater than the set value, the charger is in a start or normal running state, and the zero-crossing detection is stopped.
The invention further provides a matching identification method based on the medium-high power wireless charging equipment, which comprises the following steps:
(1) The method comprises the steps that after the wireless transmitting device is electrified, a low standby small driving signal is intermittently transmitted, wherein the low standby small driving signal is the working frequency of the wireless transmitting device corresponding to the minimum voltage capable of working by a receiving control device under the condition of maximum deviation of a wireless charging system;
(2) The receiving control device at the wireless receiving equipment end is powered on under the drive of a low standby small driving signal, the state of a zero-crossing signal is detected through a zero-crossing detection circuit, and whether the wireless receiving equipment enters a charging area is judged based on the zero-crossing signal; the time of zero-crossing detection is intermittently controlled based on the zero-crossing control circuit during zero-crossing detection, so that the problem that the software operation efficiency is low due to frequent interruption of the main control MCU is avoided;
if the wireless receiving equipment is confirmed to enter the charging area, the state information is transmitted to the wireless transmitting equipment, and closed-loop control is formed between the state information and the wireless transmitting equipment, so that the wireless transmitting equipment is converted from a low standby state to a normal energy transmitting state required by normal charging of the wireless receiving equipment, and the wireless receiving equipment charges a rechargeable battery;
(3) After the wireless receiving equipment enters a charging area, in an intermittent starting period of the wireless transmitting equipment, the receiving coil receives magnetic field energy, and then the wireless receiving equipment receives an electric signal and controls the relay control circuit to act so that the power supply circuit is connected with the rechargeable battery;
(4) When the wireless receiving equipment leaves the charging area, the power supply circuit is still connected with the rechargeable battery, and the wireless receiving equipment enters a zero-crossing detection state after detecting that the charging current is 0 or less than a set value;
(5) When the zero-crossing detection circuit cannot detect a zero-crossing signal, the wireless receiving device transmits state information to the wireless transmitting device, and the wireless receiving device enters a zero-power standby state by controlling the relay K1 to disconnect from the rechargeable battery through the main control MCU, so that the long endurance capacity of the charged device is ensured;
(6) After receiving the state information of the wireless receiving device, the wireless transmitting device enters an intermittent power supply low standby state.
Furthermore, the zero-crossing detection circuit adopts the high-speed optocoupler U1 to perform zero-crossing detection, and the input end of the high-speed optocoupler U1 is electrically connected to the rectifying circuit through the current-limiting resistor R1.
Further, the zero-crossing control circuit comprises a triode Q1, a current-limiting resistor R2, a pull-up resistor R3 and a current-limiting resistor R4, the output end of the zero-crossing detection circuit is electrically connected to the collector of the control triode Q1, the emitter of the triode Q1 is connected to an external interrupt interface I/O-1 of the main control MCU through the current-limiting resistor R2, the pull-up resistor R3 is connected between the resistor R2 and the external interrupt interface I/O-1, and the base of the triode Q1 is electrically connected to a common I/O-2 port of the main control MCU through the resistor R4.
Further, the relay control circuit comprises a triode Q2, a relay K1 and a resistor R5, wherein the base electrode of the triode Q2 is connected with a common I/O-3 port of the main control MCU through the resistor R5, the emitting electrode of the triode Q2 is grounded, the collecting electrode of the triode Q2 is connected with one end of a coil of the relay K1, and the other end of the coil of the relay K1 is connected with a VCC power supply.
Further, in the step (2), for the zero-crossing control circuit, intermittent zero-crossing detection is performed when the charging current is equal to or less than a set value, the transistor Q1 is controlled to be turned on at intervals of t1, zero-crossing detection is performed, the duration of zero-crossing detection is t2, and when the charging current is greater than the set value, the charger is indicated to be in a start or normal operation state, and the zero-crossing detection is stopped.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the scheme provided by the invention, by designing the zero-crossing detection and the corresponding control circuit at the receiving end, whether the charging equipment is within the effective distance of the transmitting coil or not can be detected in real time, and when the wireless receiving equipment enters a charging area, the wireless transmitting equipment can be ensured to quickly enter a normal energy transmitting state required by charging of the wireless receiving equipment; when the wireless receiving equipment leaves the charging area, the wireless transmitting equipment is ensured to quickly enter a low standby state, and the wireless receiving equipment enters a zero-power standby state;
the wireless transmitting device can detect the zero crossing signal by transmitting the low standby driving signal, the receiving end only needs to output the voltage between 3.3V and 5V, the voltage and the current can be detected at the same time, the receiving end only needs to transmit the low standby power consumption of the transmitting end, the receiving end generates a small voltage, the zero crossing detection is performed through the small voltage signal, at the moment, the receiving end only has weak small current signals because the voltage output by the receiving end is lower than the voltage of the battery, the transmitting energy of the transmitting end is minimum, the power consumption of the transmitting end is minimum, and the minimum standby detection and the minimum power consumption are realized.
Drawings
FIG. 1 is a schematic block diagram of a matching recognition system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a wireless receiving device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a zero crossing detection signal;
fig. 4 is a schematic diagram of a matching recognition method according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be more readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. The invention mainly aims at detecting whether the charging equipment correctly arrives in the effective distance of the charging pile, whether the charging equipment moves or deviates in the charging process or not in real time in the charging process of the medium-high power wireless charging equipment, realizing quick matching identification and realizing low standby and low power consumption control. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
The embodiment 1 discloses a matching recognition system based on medium-high power wireless charging equipment, can discern fast and is charged equipment and whether gets into or leave the charging area, as shown in fig. 1-2, including wireless transmitting equipment and wireless receiving equipment, wireless transmitting equipment includes transmitting coil and emission controlling means, wireless receiving equipment includes receiving coil, receiving controlling means and rechargeable battery, receiving coil and transmitting coil wireless communication, receiving coil links to each other with rechargeable battery through rectifier circuit 4 and filter circuit 5, and receiving coil receives the energy that transmitting coil sent and converts into direct current through rectifier circuit 4, is connected to rechargeable battery after filter circuit handles and charges it, in addition, receiving controlling means still includes battery voltage detection circuit and the charging current detection circuit who is connected with main control MCU and rechargeable battery to realize the detection to battery voltage and charging current.
As shown in fig. 2, the receiving control device includes a main control MCU, a zero crossing detection circuit 1, a zero crossing control circuit 2, a relay control circuit 3, and a power supply circuit, where the power supply circuit is used to provide power for the receiving control device, and the power supply circuit is located after the filter circuit 5 and before a relay contact switch of the relay control circuit 3, and when not charging, the power supply circuit is disconnected from the battery by the relay control circuit 3, so that the power supply circuit is in a power-down state; the main control MCU is a control center of the wireless receiving device, realizes zero-crossing signal detection and control of other control part circuits, the input end of the zero-crossing detection circuit 1 is connected with the rectifying circuit 4, the output end of the zero-crossing detection circuit 1 is connected with the control port of the main control MCU through the zero-crossing control circuit 2, the zero-crossing detection circuit 1 is used for detecting the state of energy received by the wireless receiving device (namely, the energy transmission state between the transmitting coil and the receiving coil), when the low level is detected, the state indicates that the wireless receiving device enters a charging area, and when the continuous high level is detected, the state indicates that the wireless receiving device leaves the charging area; the zero-crossing control circuit 2 is used for intermittently controlling the zero-crossing detection time when the charging current is zero, so that the problem that the system operation efficiency is low due to the fact that the main control MCU frequently enters interruption is avoided, and the relay control circuit 3 is connected between the power supply circuit and the control port of the main control MCU so as to realize the on-off of the receiving control device and the battery and further realize the low-power consumption control.
In this embodiment, with continued reference to fig. 2, the zero-crossing detection circuit 1 performs zero-crossing detection by using a high-speed optocoupler U1 (6N 137 or other high-speed optocouplers), an input end of the high-speed optocoupler is connected to the rectifying circuit 4 through a current-limiting resistor R1, and the rectifying circuit 4 is composed of a fast recovery diode or a schottky diode; the zero-crossing control circuit 2 comprises a triode Q1, a resistor R2, a pull-up resistor R3 and a resistor R4, wherein the output end of the zero-crossing detection circuit 1 is electrically connected to the collector of the triode Q1, the emitter of the triode Q1 is connected to an external interrupt interface I/O-1 of the main control MCU through the resistor R2, the pull-up resistor R3 is connected between the resistor R2 and the external interrupt interface I/O-1, and the base of the triode Q1 is electrically connected to a common interface I/O-2 of the main control MCU through the resistor R4.
In the initial state of power-on, the charging current is zero, the main control MCU controls the triode Q1 to be in a conducting state, and the zero-crossing detection circuit 1 carries out normal zero-crossing detection; when a zero-crossing signal is generated and the zero-crossing optocoupler U1 outputs a low level, the master control MCU controls the zero-crossing control circuit 2 to be turned off through external interruption and enters an intermittent zero-crossing control state; when the charging current is greater than zero, the current system is in a charging state, the MCU turns off the triode Q1, and zero crossing detection is stopped. The zero-crossing control circuit 2 performs intermittent zero-crossing detection when the charging current is equal to or less than a set value, controls the transistor Q1 to be turned on at intervals of t1, performs zero-crossing detection, and is in a zero-crossing detection stop state when the charging current is greater than the set value for a duration of t 2.
With continued reference to fig. 2, in the relay control circuit (the relay may be replaced by other switch circuits such as MOS transistors), one end of the contact switch pin is connected to the rechargeable battery, and the other end is connected to the filter circuit; the control circuit is connected with the main control MCU. Specifically, relay control circuit 3 includes triode Q2, relay K1 and resistance R5, triode Q2's base passes through resistance R5 and links to each other with master MCU's ordinary interface I/O-3 mouth, triode Q2's projecting pole ground, its collecting electrode links to each other with relay K1 coil's one end, relay K1 coil's the other termination VCC power (VCC power is the power that power supply circuit produced for relay coil supplies power), after detecting the zero crossing signal, control relay K1 actuation by master MCU, guarantee that charging circuit is connected with the battery, after zero crossing signal disappears, disconnect rechargeable battery and receive control circuit's connection, guarantee that receiving circuit zero consumption stands by.
The working principle of the matching recognition system in this embodiment is as follows:
when the wireless receiving device enters a charging area, the power supply of the receiving control device is provided by the wireless transmitting device when the wireless transmitting device intermittently works (namely, the wireless transmitting device transmits a low standby small driving signal to drive the wireless receiving device to work, the low standby small driving signal only enables the wireless receiving device to receive a voltage signal, and the voltage signal is far lower than the voltage of the rechargeable battery and insufficient to generate current, at the moment, the standby power consumption of the wireless transmitting device is very low), and the relay actuation of the relay control circuit 3 is controlled after the wireless receiving device is electrified to enable the receiving control device to be connected with the rechargeable battery.
When the wireless receiving equipment enters a charging area, the state information detected by the zero-crossing detection circuit is quickly transmitted to the transmitting equipment, and the transmitting equipment is quickly started after receiving the state information, so that the charging of the wireless receiving equipment is ensured; when the wireless receiving equipment leaves the charging area, the receiving control device can quickly cut off the connection between the receiving control circuit and the rechargeable battery through the relay control circuit according to the state information, the zero power consumption standby state of the receiving end is maintained, the long endurance capacity of the charged equipment is ensured, meanwhile, the wireless receiving equipment sends the state information to the transmitting equipment, and the transmitting equipment quickly enters the low standby state.
The following is a detailed description with reference to specific circuit diagrams:
(1) Firstly, under the conditions of maximum height and maximum offset between a transmitting coil and a receiving coil, determining the working frequency of a transmitting end corresponding to the minimum voltage which can work by a receiving control device at the moment, wherein the working frequency is the minimum standby power consumption of wireless transmitting equipment in an effective working distance; after the wireless transmitting equipment is electrified, intermittent transmission is carried out with the determined working frequency (low standby small driving signal) (the interval time is T1, the duration time is T2), and the minimum working voltage of the input end of the wireless receiving equipment is ensured within the effective working distance and the offset of the equipment so as to ensure that the receiving control device works normally under the driving of the small driving signal;
(2) When the wireless receiving equipment does not enter the charging area, the wireless receiving equipment is in a standby state, the power supply circuit and the rechargeable battery are in a disconnected state when the wireless receiving equipment is in a standby state, and the receiving control device is in a power-down state; the interface I/O-3 of the control end of the main control MCU has no level output, the triode Q1 is in an off state, the relay K1 is in an off state, and the wireless receiving equipment is in a zero-power consumption standby state;
(3) When the wireless receiving equipment enters a charging area, in the working time of the intermittent transmitting time T2 of the wireless transmitting equipment, the receiving coil senses the magnetic field energy transmitted by the transmitting coil and converts the magnetic field energy into an electric signal for working of the receiving control device through the rectifying circuit 4, so that the receiving control device is powered on;
at the moment, the main control MCU outputs a high level through the interface I/O-2 to control the triode Q1 to be conducted, controls the output of a high level through the interface I/O-3 port to control the relay K1 to be attracted, the power circuit is connected with the rechargeable battery, and the wireless receiving equipment enters a zero-crossing detection state through the zero-crossing optocoupler U1;
the main control MCU interrupt interface I/O-1 sets zero crossing interrupt priority as high, turns off the triode Q1 through the interface I/O-2, enters a zero crossing detection intermittent control mode, and has intermittent time of t1 and duration of t2 so as to prevent frequent interrupt entering and lower system operation; and t1+t2< T2, ensure that at least one zero crossing detection period is performed within the working time of the wireless transmitting device T2;
in the zero-crossing detection state, the receiving coil senses the magnetic field energy transmitted by the transmitting coil, generates a high-frequency zero-crossing signal after rectification by the rectification circuit 4, is isolated by the high-speed optocoupler U1, and inputs the zero-crossing signal into the external interrupt interface I/O-1 of the singlechip in the time t2 when the triode Q1 is conducted, wherein the zero-crossing signal is shown in figure 3, and the low level is effective;
after detecting the I/O-1 of the port to a low level, the main control MCU feeds back state information to the wireless transmitting equipment through wireless transmission (such as 2.4G, 433M, bluetooth and other communication modes), and the wireless transmitting equipment is switched from an intermittent transmission standby state to an energy transmission state required by normal charging of the wireless receiving equipment;
when the wireless receiving equipment detects that the charging current is larger than a set value, the charging is started, the main control MCU turns off the triode Q1 through the port I/O-2, and the zero-crossing intermittent detection state is stopped;
(4) When the wireless receiving equipment leaves the charging area, the zero crossing signal disappears, the charging current is zero, and the main control MCU detects that the charging current is zero, and then the triode Q1 is controlled to be conducted through the port I/O-2 to enter a zero crossing detection state (duration time t 2);
zero crossing signal disappears, zero crossing detection optocoupler U1 outputs continuous high level, after passing through triode Q1, input to MCU outside middle port I/O-1, after MCU detects continuous high level signal, output low level through port I/O-3, control triode Q2 to turn off, and then control relay K1 disconnection, receive controlling means circuit and battery disconnection completely, receiving equipment gets into zero consumption standby state.
According to the embodiment, the zero crossing detection circuit is added at the receiving end (wireless receiving equipment end), the transmitting end (wireless transmitting equipment end) transmits low standby small driving signals (each set of wireless charging system is different in working mode, different in matching, corresponding small driving signals need to be adjusted), the small driving signals are adjusted according to voltage signals at the receiving end, 3.3-5V (which is far lower than the rated voltage 24V of a battery) can be generally selected, at the moment, the voltage of the output small driving signals is lower than the voltage of the battery, no charging current exists, and at the moment, the power consumption of the transmitting end is very low. The receiving end singlechip detects zero crossing signals through external interruption, if the zero crossing signals are detected, the receiving end singlechip transmits a zone bit to the transmitting end through wireless signals, and the transmitting end enters a normal charging flow after feedback confirmation of the received signals.
Embodiment 2 is a matching recognition method based on the matching recognition system of embodiment 1 based on a medium-high power wireless charging device, the schematic block diagram of which is shown in fig. 4, specifically comprising the following steps:
(1) The method comprises the steps that after the wireless transmitting device is electrified, a low standby small driving signal is intermittently transmitted, the low standby small driving signal is the working frequency of the wireless transmitting device corresponding to the minimum voltage which can be operated by a receiving control device under the condition of the maximum deviation of a wireless charging system (each set of wireless charging system is different in working mode and different in matching, the corresponding small driving signal is required to be adjusted), the small driving signal is adjusted according to the voltage signal at a receiving end, generally 3.3-5V (which is far lower than the rated voltage 24V of a battery) can be selected, at the moment, the voltage of the output small driving signal is lower than the voltage of the battery, no charging current exists, at the moment, the power consumption of the transmitting end is very low, and the working frequency is the minimum standby power consumption of the wireless transmitting device in an effective working distance;
(2) The receiving control device at the wireless receiving equipment end is powered on under the drive of a low standby small driving signal, the zero-crossing signal state is detected through the zero-crossing detection circuit, when the zero-crossing signal is detected to be low, the wireless receiving equipment is confirmed to enter a charging area, state information is transmitted to the wireless transmitting equipment, closed-loop control is formed between the wireless receiving equipment and the wireless transmitting equipment, the wireless transmitting equipment is enabled to be converted into a normal energy transmitting state required by normal charging of the wireless receiving equipment from the low standby state, and the wireless receiving equipment is enabled to charge a rechargeable battery;
(3) After the wireless receiving equipment enters a charging area, in an intermittent starting period of the wireless transmitting equipment, the receiving coil receives magnetic field energy, and then the wireless receiving equipment receives an electric signal and then controls the relay K1 to be attracted, and after the relay K1 is attracted, the power circuit is connected with the rechargeable battery;
(4) When the wireless receiving equipment leaves the charging area, the relay K1 is in a suction state, the power supply circuit is still connected with the rechargeable battery, and the wireless receiving equipment enters a zero-crossing detection state after detecting that the charging current is 0;
(5) The zero-crossing detection circuit detects continuous high level, the wireless receiving equipment transmits state information to the wireless transmitting equipment, and the wireless receiving equipment enters a zero-power standby state by controlling the relay K1 to disconnect from the rechargeable battery through the main control MCU, so that the long endurance of the charged equipment is ensured;
(6) After receiving the state information of the wireless receiving device, the wireless transmitting device enters an intermittent power supply low standby state.
Experiments prove that in the charging process, the moment of moving, tilting and shifting the receiving coil can cause the signal of the receiving end to disappear temporarily, namely the matching identification of the wireless charging system is changed; the receiving end can transmit information to the transmitting end according to zero-crossing signal detection, the transmitting end performs normal signal driving control according to information feedback of the receiving end, and the receiving end simultaneously performs voltage, current and zero-crossing detection and feeds information back to the transmitting end for closed-loop control. Compared with the control method for detecting the voltage and the current of the receiving end, the invention can reduce the standby power consumption of the transmitting end by one time and reduce the standby heating value of the power device. Meanwhile, the frequency of the receiving end can be obtained through zero-crossing detection, the resonance and feedback conditions of transmitting and receiving are confirmed, the fast matching identification can be realized, the low-power consumption control can be realized, and the method has high practical value and popularization value.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. The matching recognition method based on the matching recognition system of the medium-high power wireless charging equipment comprises wireless transmitting equipment and wireless receiving equipment, wherein the wireless transmitting equipment comprises a transmitting coil and a transmitting control device, the wireless receiving equipment comprises a receiving coil, a receiving control device and a rechargeable battery, the receiving control device and the transmitting control device are in wireless communication for information transmission, the receiving coil is connected with the rechargeable battery through a rectifying circuit (4) and a filtering circuit (5), the receiving coil receives energy sent by the transmitting coil and converts the energy into direct current through the rectifying circuit (4), the direct current is electrically connected to the rechargeable battery for charging after filtering, and the receiving control device further comprises a battery voltage detection circuit and a charging current detection circuit which are connected with a main control MCU and the rechargeable battery for detecting battery voltage and charging current;
the receiving control device comprises a main control MCU, a zero crossing detection circuit (1), a zero crossing control circuit (2), a relay control circuit (3) and a power supply circuit, wherein the power supply circuit is used for providing power for the receiving control device, and is positioned behind the filter circuit (5) and in front of a relay contact switch of the relay control circuit (3), and the power supply circuit is disconnected with a battery through the relay control circuit (3) when not charged, so that the power supply circuit is in a power-down state; the MCU is a control center of the wireless receiving equipment, and realizes zero-crossing signal detection and control of the wireless receiving equipment; the input end of the zero-crossing detection circuit (1) is connected with the rectification circuit (4), and the output end of the zero-crossing detection circuit is connected with the control port of the main control MCU through the zero-crossing control circuit (2) and is used for detecting the state of energy received by the wireless receiving equipment; the zero-crossing control circuit (2) is used for intermittently controlling the time of zero-crossing detection when the charging current is zero, avoiding low software operation efficiency caused by frequent interruption of the main control MCU, the relay control circuit (3) is connected between the power supply circuit and the control port of the main control MCU, and the relay contact switch is connected between the battery and the filter circuit, so as to realize the on-off of the receiving control device and the battery and further realize the zero standby power consumption control when the charging is not performed, and the matching identification method is characterized by comprising the following steps:
(1) The method comprises the steps that after the wireless transmitting device is electrified, a low standby small driving signal is intermittently transmitted, wherein the low standby small driving signal is the working frequency of the wireless transmitting device corresponding to the minimum voltage capable of working by a receiving control device under the condition of maximum deviation of a wireless charging system;
(2) The receiving control device at the wireless receiving equipment end is powered on under the drive of a low standby small driving signal, the state of a zero-crossing signal is detected through a zero-crossing detection circuit (1), and whether the wireless receiving equipment enters a charging area is judged based on the zero-crossing signal; the time of zero crossing detection is intermittently controlled based on the zero crossing control circuit (2) during zero crossing detection, so that the problem that the software operation efficiency is low due to frequent interruption of the main control MCU is avoided;
if the wireless receiving equipment is confirmed to enter the charging area, the state information is transmitted to the wireless transmitting equipment, and closed-loop control is formed between the state information and the wireless transmitting equipment, so that the wireless transmitting equipment is converted from a low standby state to a normal energy transmitting state required by normal charging of the wireless receiving equipment, and the wireless receiving equipment charges a rechargeable battery;
(3) After the wireless receiving equipment enters a charging area, in an intermittent starting period of the wireless transmitting equipment, the receiving coil receives magnetic field energy, and then the wireless receiving equipment receives an electric signal and then controls the relay control circuit (3) to act so as to enable the power supply circuit to be connected with the rechargeable battery;
(4) When the wireless receiving equipment leaves the charging area, the power supply circuit is still connected with the rechargeable battery, and the wireless receiving equipment enters a zero-crossing detection state after detecting that the charging current is 0 or less than a set value;
(5) When the zero-crossing detection circuit (1) cannot detect a zero-crossing signal, the wireless receiving device transmits state information to the wireless transmitting device, and the wireless receiving device is controlled by the main control MCU to disconnect the relay K1 of the relay control circuit from the rechargeable battery, so that the wireless receiving device enters a zero-power consumption standby state, and the long endurance of the charged device is ensured;
(6) After receiving the state information of the wireless receiving device, the wireless transmitting device enters an intermittent power supply low standby state.
2. The matching recognition method of the matching recognition system based on the medium-high power wireless charging equipment according to claim 1, wherein the zero-crossing detection circuit (1) adopts a high-speed optocoupler U1 to perform zero-crossing detection, and the input end of the high-speed optocoupler U1 is electrically connected to the rectifying circuit (4) through a current-limiting resistor R1.
3. The matching recognition method of the matching recognition system based on the medium-high power wireless charging equipment according to claim 1, wherein the zero-crossing control circuit (2) comprises a triode Q1, a current limiting resistor R2, a pull-up resistor R3 and a current limiting resistor R4, the output end of the zero-crossing detection circuit (1) is electrically connected to the collector of the control triode Q1, the emitter of the triode Q1 is connected to an external interrupt interface (I/O-1) of the main control MCU through the current limiting resistor R2, the pull-up resistor R3 is connected between the current limiting resistor R2 and the external interrupt interface (I/O-1), and the base of the triode Q1 is electrically connected to the interface (I/O-2) of the main control MCU through the current limiting resistor R4.
4. The matching recognition method of the matching recognition system based on the medium-high power wireless charging equipment according to claim 3, wherein the relay control circuit (3) comprises a triode Q2, a relay K1 and a resistor R5, a base electrode of the triode Q2 is connected with an interface (I/O-3) of the main control MCU through the resistor R5, an emitting electrode of the triode Q2 is grounded, a collecting electrode of the triode Q2 is connected with one end of a coil of the relay K1, and the other end of the coil of the relay K1 is connected with a VCC power supply.
5. The method for matching and identifying the matching and identifying system based on the medium and high power wireless charging equipment according to claim 3, wherein in the step (2), for the zero-crossing control circuit, intermittent zero-crossing detection is performed when the charging current is equal to zero or less than a set value, the transistor Q1 is controlled to be turned on every time t1, zero-crossing detection is performed, the duration of the zero-crossing detection is t2, and when the charging current is greater than the set value, the charger is in a start or normal operation state, and the zero-crossing detection is stopped.
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| CN110780109A (en) * | 2019-11-13 | 2020-02-11 | 小熊电器股份有限公司 | Resistive load detection circuit and detection method |
| CN114157050A (en) * | 2022-01-04 | 2022-03-08 | 深圳市力生美半导体股份有限公司 | Wireless charging circuit and method with low standby power consumption |
| CN114498961A (en) * | 2022-04-14 | 2022-05-13 | 成都市易冲半导体有限公司 | Method for reducing static power consumption of transmitting terminal of wireless charging system and transmitting terminal |
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Address after: No. 328 Chengkang Road, Xiazhuang Street, Chengyang District, Qingdao City, Shandong Province, 266000, Liandong U-Valley Phase I, 1-302 Applicant after: Qingdao Zhongke Ruixin wireless charging technology Co.,Ltd. Address before: Room 410, Building 20, Qingdao Doctor Entrepreneurship Park, No. 89 Changcheng Road, Chengyang District, Qingdao City, Shandong Province, 266000 Applicant before: QINGDAO ZHONGKE RUIXIN ELECTRIC TECHNOLOGY CO.,LTD. |
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