CN111049241B - Unmanned aerial vehicle wireless charging safety early warning system - Google Patents
Unmanned aerial vehicle wireless charging safety early warning system Download PDFInfo
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- CN111049241B CN111049241B CN202010067203.8A CN202010067203A CN111049241B CN 111049241 B CN111049241 B CN 111049241B CN 202010067203 A CN202010067203 A CN 202010067203A CN 111049241 B CN111049241 B CN 111049241B
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- 238000004146 energy storage Methods 0.000 claims abstract description 26
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000002159 abnormal effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 47
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U50/00—Propulsion; Power supply
- B64U50/30—Supply or distribution of electrical power
- B64U50/34—In-flight charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to an unmanned aerial vehicle wireless charging safety early warning system.A power abnormity detection module calculates a difference signal, a high-low voltage trigger circuit detects whether the power is abnormal, when the power is abnormal high, one path of the difference signal enters a frequency regulation module, resonance parameters of a resonance loop of a radio frequency transmitting module and a radio frequency receiving module are regulated, the problem that the other path of the difference signal simultaneously enters an energy storage module when harmonic frequency interference occurs, when the temperature rises within an allowable range, the voltage output by a voltage stabilizing module is divided and shunted by the energy storage circuit to avoid damage to a battery, in order to avoid the problem that the temperature rises too fast to avoid source control is solved, a battery charging loop is disconnected by the early warning module, when the power is normal, the difference signal enters the early warning module, the trigger circuit predicts the thermal runaway during battery charging, when the thermal runaway is predicted to occur, the battery charging loop is disconnected, and the problem that the internal resistance of the battery is reduced, the current is very large, and the battery is damaged is solved.
Description
Technical Field
The invention relates to the technical field of unmanned aerial vehicle charging, in particular to a wireless charging safety early warning system for an unmanned aerial vehicle.
Background
At present, a wireless charging system of an unmanned aerial vehicle generally comprises a radio frequency transmitting module, a radio frequency electric wave adjusting module, a radio frequency receiving module, a power adjusting module and a voltage stabilizing module, wherein the radio frequency transmitting module transmits electromagnetic waves with stable frequency after being adjusted by the radio frequency electric wave adjusting module, the radio frequency receiving module receives the electromagnetic waves by using an electromagnetic induction law, the electromagnetic waves are converted into stable voltage signals by the voltage stabilizing module to charge an unmanned aerial vehicle battery (polymer lithium battery), the electromagnetic waves generally have transmission power loss paths in space transmission and directly affect the charging efficiency of the battery, the electromagnetic waves can be adjusted and solved by the power adjusting module, the electromagnetic waves can cause the voltage signals to be multiplied after being converted by the voltage stabilizing module when the electromagnetic waves are subjected to harmonic frequency interference in space transmission, as is well known, the charging voltage of the battery is too high or the internal resistance of the battery is small, the current is very large, and the battery, therefore, the charging safety needs to be warned, and the standby battery damage is prevented actively in time.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a wireless charging safety early warning system for an unmanned aerial vehicle, which can realize battery charging safety early warning for the unmanned aerial vehicle and actively prevent battery damage to be generated in time.
The technical scheme includes that the device comprises a power abnormity detection module, a frequency adjustment module, an energy storage module and an early warning module, and is characterized in that the power abnormity detection module adopts a differential amplifier to calculate a difference signal between a power signal transmitted by a radio frequency transmission module and a power signal received by a radio frequency receiving module, the difference signal enters a high-low voltage trigger circuit consisting of triodes Q1, Q2 and Q3 to detect whether the power is abnormal or not, when the power is abnormal high, the difference signal respectively enters the frequency adjustment module and the energy storage module, the frequency adjustment module adopts a holding circuit to hold the difference signal and then enters a photoelectric coupler U1 to carry out signal conversion, the converted signal is amplified by a gain control circuit taking the triode Q7 as a core, the amplified signal is added to a resonance loop of the radio frequency transmission module and the radio frequency receiving module to adjust resonance parameters, the energy storage module adopts an integrator to calculate the temperature change rate when a battery is charged, when the temperature stabilizing tube Z3 breaks down, the high-power transistors VT1 and VT2 are conducted, an energy storage circuit consisting of the capacitor C7, the capacitor C8, the diodes D8-D10 and the inductor L2 stores energy, the charging current of the battery is reduced, when the power is normal, a difference signal enters an early warning module, a trigger circuit with the unijunction transistor T1 as a core is used for predicting thermal runaway during battery charging, when the thermal runaway is predicted, the high-power transistors VT1 and VT2 are conducted, the coil of the relay K1 is electrified, and the normally closed contact breaks a battery charging loop to achieve protection.
The invention has the beneficial effects that: when the power is abnormally high, one path adopts a holding circuit to hold a difference signal, a photoelectric coupler U1 carries out signal conversion, the converted signal is amplified by a gain control circuit taking a triode Q7 as a core, the amplified signal is added to a resonant loop of a radio frequency transmitting module and a radio frequency receiving module to adjust resonant parameters, the problem that the battery is controlled from a source causing thermal runaway during harmonic frequency interference is solved, the other path adopts an integrator to calculate the temperature change rate during battery charging, when the temperature rises within an allowable range, the voltage output by a voltage stabilizing module is divided and shunted by an energy storage circuit, the damage of the battery caused by the thermal runaway or ignition burning to the battery is avoided, in order to avoid the problem that the temperature rises too fast to cause the damage of the battery from the source control, when the temperature rises too fast, a high-power transistor VT5 in the early warning module is conducted, the coil of the relay K1 is electrified, and the normally closed contact K1-1 disconnects the battery charging loop, so that the thermal runaway protection of the battery is realized;
when the power is normal, a temperature signal and a temperature change rate signal which are detected by a temperature sensor and used for charging the battery are added to a trigger circuit to predict thermal runaway during battery charging, wherein the conduction time of the trigger circuit is determined by the abnormally high degree of temperature and the speed of the temperature change rate, when the thermal runaway is predicted to happen, high-power transistors VT3 and VT4 are conducted, a coil of a relay K1 is electrified, a battery charging loop is disconnected by a normally closed contact K1-1, and the problem that the battery is damaged by the thermal runaway or the danger of firing burning caused by the fact that the current is very large when the internal resistance of the battery becomes small is solved.
Drawings
FIG. 1 is a schematic diagram of a power anomaly detection module of the present invention.
Fig. 2 is a schematic diagram of a frequency adjustment module of the present invention.
Fig. 3 is a schematic diagram of an energy storage module of the present invention.
Fig. 4 is a schematic diagram of an early warning module of the present invention.
Detailed Description
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to figures 1 to 4. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A wireless charging safety early warning system of an unmanned aerial vehicle comprises a power abnormity detection module, a frequency adjusting module, an energy storage module and an early warning module, wherein the power abnormity detection module adopts a differential amplifier to calculate a difference signal between a power signal transmitted by a radio frequency transmitting module and a power signal received by a radio frequency receiving module, the difference signal enters a high-low voltage trigger circuit consisting of triodes Q1, Q2 and Q3 to detect whether the power is abnormal or not, when the power is abnormally high, the difference signal respectively enters the frequency adjusting module and the energy storage module, the frequency adjusting module adopts a holding circuit to hold the difference signal and then enters a photoelectric coupler U1 to carry out signal conversion, the converted signal is amplified by a gain control circuit taking the triode Q7 as a core, the amplified signal is added to a resonant loop of the radio frequency transmitting module and the radio frequency receiving module to adjust resonant parameters, the energy storage module adopts an integrator to calculate the temperature change rate when a battery is charged, when the temperature regulator tube Z3 breaks down, the high-power transistors VT1 and VT2 are conducted, an energy storage circuit consisting of the capacitor C7, the capacitor C8, the diodes D8-D10 and the inductor L2 stores energy, the charging current of the battery is reduced, when the power is normal, a difference signal enters an early warning module, a trigger circuit with the unijunction transistor T1 as a core is used for predicting thermal runaway during battery charging, when the thermal runaway is predicted, the high-power transistors VT1 and VT2 are conducted, a coil of the relay K1 is electrified, and a normally closed contact breaks a battery charging loop to realize protection;
when the frequency adjusting module receives power which is abnormally high, an emitter of a triode Q3 outputs a difference signal, the difference signal is filtered by a resistor R6 and a capacitor C1 and then enters a holding circuit consisting of an operational amplifier AR3, a diode D1 and a capacitor C3 to be held under the control of a sampling switch of a triode Q5, wherein the switching state of the triode Q5 is controlled by respectively adding a front signal and a rear signal to a base and an emitter of a triode Q4, namely when the current sampling signal is lower than the previous sampling signal, the triode Q4 is conducted, the previous sampling signal is subjected to voltage division by a resistor R7 and a resistor R8 and then fed back to the base of the triode Q5 by a resistor R9, the triode Q5 is triggered and conducted to allow the sampling signal to enter the holding circuit, meanwhile, the triode Q6 is conducted, the remaining difference signal is added to a pin 1 of a photoelectric coupler U1, as a pin 2 of the photoelectric coupler U1 is connected with a power supply +5V, the voltage difference makes the output end of the photocoupler U1 output linear voltage (0-10V voltage), i.e. signal conversion, the converted signal is amplified by the gain control circuit composed of the triode Q7, the resistor R13-the resistor R18 and the diode D2, wherein the triode Q7 is an emitter follower, the size of the signal output by the gain control circuit is controlled by coupling the difference signal after the triode Q6 is turned on and the difference signal after being kept, wherein the pull-up power supply is specifically coupled by the voltage provided by the resistor R17 and the resistor R18 series voltage dividing circuit and the difference signal, and then coupled with the voltage provided by the resistor R13-R15 and the resistor R5 series voltage dividing circuit, after the voltage coupling circuit composed of the resistor R13-the resistor R18 is coupled, the amplified signal is applied to the resonant loop of the radio frequency transmitting module and the radio frequency receiving module, the resonant loop structure of the radio frequency transmitting module is shown in figure 2, the resonant circuit structure of the radio frequency receiving module and the resonant circuit structure of the radio frequency transmitting module are specifically, the resonant circuit is formed by connecting an inductor L3 and a capacitor C5 in parallel and then connecting the capacitor C4 and a varactor BD2 in series, the amplified signal changes the capacitance value of the varactor BD2, further changes the transmitting frequency of the radio frequency transmitting module and the receiving frequency of the radio frequency receiving module simultaneously, namely, by adjusting the transmitting and receiving resonant parameters simultaneously, the problem that when the power is abnormally high, the source of battery thermal runaway is controlled, and the problem that the voltage signal is multiplied after being converted by a voltage stabilizing module and the battery is damaged when harmonic frequency interference is avoided is solved, the resonant circuit structure comprises a resistor R6, one end of the resistor R6 is connected with an emitter of a triode Q3, the other end of the resistor R6 is respectively connected with one end of a grounding capacitor C1, the emitter of the triode Q5 and the base of the triode Q4, the collector of the triode Q5 is connected with the non-inverting input end of an operational amplifier AR3, the inverting input end of the operational amplifier AR3 is respectively connected with the cathode of a diode D1, one end of a grounded capacitor C3, the pin 1 of a photocoupler U1, the collector of a triode Q6 and one end of a resistor R7, the output end of the operational amplifier AR3 is connected with the anode of a diode D1, the other end of a resistor R7 is connected with the emitter of a triode Q4, the collector of a triode Q4 is respectively connected with one end of a grounded resistor R8, one end of a resistor R9 and the base of a triode Q6, the other end of a resistor R9 is connected with the base of a triode Q5, the pin 2 of a photocoupler U1 is connected with a power supply +5V, the pin 4 of a photocoupler U53 is connected with a power supply +10V, the pin 3 of a photocoupler U1 is respectively connected with one end of a resistor R4, the base of a triode Q7, the other, an emitter of the transistor Q7 is respectively connected with one end of the resistor R5, a cathode of the diode D2, one end of the resistor R15, an anode of the diode D3, the other end of the resistor R5 is grounded, an anode of the diode D2 is respectively connected with the other end of the resistor R15, one end of the resistor R13, one end of the resistor R14, the other end of the resistor R14 is respectively connected with one end of the resistor R16 and an emitter of the transistor Q6, the other end of the resistor R16 is respectively connected with one end of the resistor R17 and one end of the resistor R18, the other end of the resistor R18 is grounded, the other ends of the resistor R13 and the resistor R17 are respectively connected with +10V, a cathode of the diode D17 is connected with one end of the resistor R17, the other end of the resistor R17 is respectively connected with one end of the capacitor C17 and a cathode of the varactor diode BD 17, the other end of the capacitor C36, the anode of the varactor diode BD2, the other end of the variable capacitor C5, and the other end of the inductor L3 are connected to ground;
the energy storage module receives a temperature signal detected by a temperature sensor when a battery is charged, an integrator consisting of an operational amplifier AR2, a resistor R20-a resistor R22 and a capacitor C6 is adopted to calculate the temperature change rate of the battery when the battery is charged, when the temperature rises within an allowable range, a voltage regulator tube Z3 is broken down to trigger the conduction of a high-power transistor VT1, meanwhile, when the base electrode of the high-power transistor VT2 is connected with abnormally high power, a triode Q3 emitter outputs a difference signal, the high-power transistor VT2 is also conducted, a capacitor C7, a capacitor C8, a diode D8-D10 and an energy storage circuit consisting of an inductor L2 store energy (the capacity of the stored energy is determined by the value of the capacitor C7), the voltage output by the voltage stabilizing module is divided in an energy storage mode, meanwhile, the high-power transistors VT1 and VT2 are conducted to be connected with the battery in parallel for shunting, the charging current, when the source of the battery thermal runaway is controlled, the energy storage mode is adopted to divide voltage and shunt to avoid the damage of the battery caused by the thermal runaway or the fire burning of the battery, and in order to avoid the problem that the battery is not in time to be damaged by the source control due to the too fast temperature rise, the voltage stabilizing tube Z6 is broken down when the temperature rises too fast, the high-power transistor VT5 is conducted, the coil of the relay K1 is electrified, the normally closed contact K1-1 is disconnected with the battery charging loop to realize the thermal runaway protection of the battery, the device comprises a resistor R20, one end of the resistor R20 is connected with a temperature signal detected by a temperature sensor during the battery charging, the other end of the resistor R20 is respectively connected with the non-inverting input end of an operational amplifier AR2, one end of a resistor R21 and one end of a capacitor C6, the inverting input end of the operational amplifier AR2 is connected with the ground through a resistor R22, the output end of the operational, The other end of the capacitor C6, the cathode of the voltage regulator tube Z3, the anode of the voltage regulator tube Z3 is connected with the base of the high-power transistor VT1, the collector of the high-power transistor VT1 is connected with one end of the inductor L1, the cathode of the diode D6 and the anode of the diode D8 respectively, the emitter of the high-power transistor VT1 is connected with the collector of the high-power transistor VT2, the anode of the diode D6, the cathode of the diode D7 and one end of the capacitor C7 respectively, the base of the high-power transistor VT2 is connected with the emitter of the triode Q3, the other end of the capacitor C7 is connected with the cathode of the diode D8 and the anode of the diode D9 respectively, the cathode of the diode D9 is connected with one end of the capacitor C9 and the anode of the diode D9, the cathode of the diode D9 is connected with one end of the inductor L9, the other end of the inductor L9 and one end of the normally closed contact, the other end of a normally closed contact K1-1 of the relay K1 is connected with the anode of a battery P1, and the emitter of a high-power transistor VT2, the anode of a diode D7, the other end of a capacitor C8 and the cathode of the battery P1 are connected with the ground;
the power abnormity detection module adopts a differential amplifier composed of a resistor R1, a resistor R2, a resistor R3 and an operational amplifier AR1 to calculate a difference signal between a power signal transmitted by the radio frequency transmission module and a power signal received by the radio frequency receiving module (the difference signal can be collected by a power collector with the model of PIM600MC and is accessed through an RS485 communication interface), the difference signal enters a high-low voltage trigger circuit composed of triodes Q1, Q2 and Q3 to detect whether the power is abnormal or not, specifically, when the amplitude of the difference signal is higher than 8V voltage corresponding to normal loss of 30% + 60%, a voltage regulator Z2 is broken down, the difference signal is connected to a collector of a triode Q3, at the moment, the triodes Q1 and Q3 are conducted, namely, when the power is abnormally high, the emitter of the triode Q3 outputs the difference signal to enter a frequency adjustment module and an energy storage module respectively, the amplitude of the difference signal is higher than 4.5V corresponding to normal loss of 30% -15% and lower than 7V corresponding, a voltage regulator tube Z1 is broken down, a difference signal is added to a base electrode of a triode Q1 and an emitter electrode of a triode Q2, the emitter electrode of the triode Q1 and a base electrode of a triode Q2 are connected with a base electrode of a triode Q3, at the moment, the triodes Q1 and Q2 are conducted, namely when the power is normal, a collector electrode of the triode Q2 outputs the difference signal to the early warning module, the difference signal comprises a resistor R1, a resistor R3 and an operational amplifier AR1, one end of the resistor R1 is connected with a power signal received by the radio frequency receiving module, one end of the resistor R3 and a non-inverting input end of the operational amplifier AR1 are connected with a power signal emitted by the radio frequency emitting module, the other end of the resistor R3 is connected with the ground, an inverting input end of the operational amplifier AR1 is respectively connected with the other end of the resistor R1 and one end of the resistor R2, an output end of the operational amplifier AR1 is respectively connected, The negative pole of a voltage regulator tube Z2, the positive pole of a voltage regulator tube Z1 is respectively connected with one end of a resistor R5, the base electrode of a triode Q1 and the emitting electrode of a triode Q2, the other end of the resistor R5 and the collecting electrode of a triode Q1 are connected with the ground, the emitting electrode of a triode Q1 is respectively connected with the base electrode of a triode Q2 and the base electrode of a triode Q3, the collecting electrode of the triode Q3 is connected with the positive pole of a voltage regulator tube Z2, the collecting electrode of the triode Q2 outputs a difference signal when the power is normal, and the emitting electrode of a triode Q3 outputs a difference signal when the;
the early warning module receives a temperature signal and a temperature change rate signal which are detected by a temperature sensor and used when a battery is charged, the temperature signal and the temperature change rate signal are added to a trigger circuit consisting of a unijunction transistor T1, a serially connected variable capacitance diode DC1 and a capacitor C2 resistor R10-a resistor R12 to predict thermal runaway when the battery is charged, wherein the conduction time of the trigger circuit is determined by the abnormally high temperature degree and the speed of the temperature change rate, when the thermal runaway is about to occur, the high-power transistor VT3 is conducted, meanwhile, a difference signal is output by a collector of a triode Q2 when the base of the high-power transistor VT4 is connected with normal power, as an emitter of the high-power transistor VT4 is connected with the ground, the high-power transistor VT4 is also conducted, a coil of a relay K1 is electrified, a normally closed contact K1-1 disconnects a battery charging loop, the problem that the internal resistance of the battery is reduced and the, in order to avoid the problem that the battery is damaged due to too fast temperature rise caused by source control when the power is abnormally high, the device is arranged to break down a voltage regulator tube Z6 when the temperature rises too fast, conduct a high-power transistor VT5, electrify a coil of a relay K1 and disconnect a battery charging loop through a normally closed contact K1-1 to realize thermal runaway protection of the battery, and comprises a unijunction transistor T1, wherein an emitter of the unijunction transistor T1 is respectively connected with an anode of a variable capacitance diode DC1 and one end of a resistor R10, a cathode of the variable capacitance diode DC1 is connected with one end of a capacitor C2 and an output end of an operational amplifier AR2, the other end of the capacitor C2 is connected with the ground, a second base of the unijunction transistor T1 is connected with one end of a resistor R11, the other end of the resistor R48 and the other end of the resistor R10 are connected with a temperature signal detected by a temperature sensor during battery charging, and a first base of the unijunction transistor T, The negative electrode of a voltage regulator tube Z4, the negative electrode of a voltage regulator tube Z5, the other end of a resistor R12 are grounded, the positive electrode of a voltage regulator tube Z4 is grounded, the positive electrode of a voltage regulator tube Z5 is connected with the base electrode of a high-power transistor VT3, the collector electrode of the high-power transistor VT3, the negative electrode of a diode D4 and the collector electrode of a high-power transistor VT5 are all connected with a power supply of +36V, the emitter electrode of a high-power transistor VT3 is respectively connected with the collector electrode of the high-power transistor, the negative electrode of the diode D5, the positive electrode of the diode D4, the base electrode of the high-power transistor VT4 is connected with the collector electrode of the triode Q2, the emitter electrode of the high-power transistor VT4, the positive electrode of the diode D5 and the emitter electrode of the high-power transistor VT5 are connected with one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected with the ground, the base electrode of the high-power transistor VT5 is connected with the positive electrode of the voltage regulator tube Z6, and the negative electrode of the voltage regulator tube Z6 is connected with the.
When the invention is used specifically, the power abnormality detection module calculates a difference signal between a power signal transmitted by the radio frequency transmission module and a power signal received by the radio frequency receiving module by using a differential amplifier composed of a resistor R1, a resistor R2, a resistor R3 and an operational amplifier AR1, the difference signal enters a high-low voltage trigger circuit composed of triodes Q1, Q2 and Q3 to detect whether the power is abnormal or not, when the power is abnormally high, a triode Q3 emitter outputs the difference signal to enter a frequency adjustment module and an energy storage module respectively, when the amplitude of the difference signal is higher than a voltage 4.5V corresponding to normal loss by 30% -15% and lower than a voltage 7V corresponding to normal loss by 30% + 40%, namely when the power is normal, a collector of the triode Q2 outputs the difference signal to the early warning module, when the frequency adjustment module receives the abnormally high power, the emitter of the triode Q3 outputs the difference signal, the signal enters a holding circuit composed of an operational amplifier AR3, a diode D1 and a capacitor C3 for holding, a difference signal is added to a pin 1 of a photoelectric coupler U1 after holding, as a pin 2 of the photoelectric coupler U1 is connected with a power supply +5V, the input end of the photoelectric coupler U1 has a voltage difference, the voltage difference enables the output end of the photoelectric coupler U1 to output a linear voltage (0-10V voltage), namely, the signal is converted, the converted signal is amplified through a gain control circuit composed of a triode Q7, a resistor R13, a resistor R18 and a diode D2, the amplified signal is added to a resonant circuit in a radio frequency transmitting module and a radio frequency receiving module, the resonant circuit is composed of an inductor L3 and the capacitor C5 which are connected in parallel and then connected with a capacitor C4 and a BD2 which are connected in series, the amplified signal changes the capacitance value of a variable capacitance diode BD2, further, the transmitting frequency of the radio frequency transmitting module and the receiving frequency of the radio, namely, by adjusting the transmitting and receiving resonance parameters simultaneously, the problem that the battery is damaged due to the fact that the voltage signal is multiplied after the conversion of the voltage stabilizing module when the power is abnormally high and is controlled at the source of thermal runaway of the battery is avoided when harmonic frequency interference is caused, the energy storage module receives the temperature signal detected by the temperature sensor when the battery is charged, the temperature change rate of the battery when the battery is charged is calculated by adopting an integrator, when the temperature rises within an allowable range, the voltage stabilizing tube Z3 is broken down to trigger the high-power transistors VT1 and VT2 to be also conducted, an energy storage circuit consisting of the capacitor C7, the capacitor C8, the diodes D8-D10 and the inductor L2 stores energy, the voltage output by the voltage stabilizing module is divided by an energy storage mode, meanwhile, the high-power transistors VT1 and VT2 are conducted to be connected with the battery in parallel to divide the voltage, the charging current of the battery is reduced, and the problem that when the power is abnormally high, meanwhile, in order to avoid the problem that the battery is damaged due to too fast temperature rise and too late control from the source, when the temperature rises too fast, a voltage regulator tube Z6 is broken down, a high-power transistor VT5 is conducted, a relay K1 coil is electrified, a normally closed contact K1-1 is disconnected with a battery charging loop to realize thermal runaway protection of the battery, the early warning module receives a temperature signal and a temperature change rate signal detected by a temperature sensor during battery charging and adds the temperature signal and the temperature change rate signal to a trigger circuit formed by a unijunction transistor T1, a serially connected varactor diode DC1 and a capacitor C2 resistor R10-a resistor R12 to predict thermal runaway during battery charging, wherein the conduction time of the trigger circuit is determined by the abnormally high degree of temperature and the high speed of the temperature change rate, when the thermal runaway is predicted to happen, the high-power transistors VT3 and VT4 are conducted, the relay K1 coil is electrified, and the normally closed contact K1-1 is disconnected with the battery, the problem of the internal resistance of battery diminishes, and the danger that battery emergence thermal runaway or fire burning that the electric current can very big cause is to the harm of battery is solved.
Claims (4)
1. An unmanned aerial vehicle wireless charging safety early warning system comprises a power abnormity detection module, a frequency adjustment module, an energy storage module and an early warning module, and is characterized in that the power abnormity detection module adopts a differential amplifier to calculate a difference signal between a power signal transmitted by a radio frequency transmission module and a power signal received by a radio frequency receiving module, the difference signal enters a high-low voltage trigger circuit consisting of triodes Q1, Q2 and Q3 to detect whether the power is abnormal or not, when the power is abnormally high, the difference signal respectively enters the frequency adjustment module and the energy storage module, the frequency adjustment module adopts a holding circuit to hold the difference signal and then enters a photoelectric coupler U1 to carry out signal conversion, the converted signal is amplified by a gain control circuit taking the triode Q7 as a core, the amplified signal is added to a resonance circuit of the radio frequency transmission module and the radio frequency receiving module to adjust resonance parameters, the energy storage module adopts an integrator to calculate the temperature change rate of a battery during charging, a voltage regulator tube Z3 breaks down when the battery is too fast, a high-power transistor VT1 and a VT2 are conducted, an energy storage circuit consisting of a capacitor C7, a capacitor C8, diodes D8-D10 and an inductor L2 stores energy, the charging current of the battery is reduced, when the power is normal, a difference signal enters an early warning module, a trigger circuit with a unijunction transistor T1 as a core is used for predicting thermal runaway of the battery during charging, when the thermal runaway is predicted, the high-power transistors VT1 and VT2 are conducted, a coil of a relay K1 is electrified, and a normally closed contact breaks a battery charging loop to realize protection.
2. The unmanned aerial vehicle wireless charging safety early warning system of claim 1, wherein the frequency adjustment module comprises a resistor R6, one end of the resistor R6 is connected with an emitter of a triode Q3, the other end of the resistor R6 is respectively connected with one end of a grounded capacitor C1, an emitter of a triode Q5 and a base of a triode Q4, a collector of a triode Q5 is connected with a non-inverting input end of an operational amplifier AR3, an inverting input end of the operational amplifier AR3 is respectively connected with a negative electrode of a diode D1, one end of a grounded capacitor C3, a pin 1 of a photocoupler U1, a collector of a triode Q6 and one end of a resistor R7, an output end of the operational amplifier AR3 is connected with a positive electrode of a diode D1, the other end of the resistor R7 is connected with an emitter of a triode Q4, a collector of a triode Q4 is respectively connected with one end of a grounded resistor R8, one end of a resistor R, the other end of the resistor R9 is connected with the base of a triode Q5, the pin 2 of a photocoupler U1 is connected with +5V of a power supply, the pin 4 of a photocoupler U1 is connected with +10V of the power supply, the pin 3 of a photocoupler U1 is respectively connected with one end of a resistor R4 and the base of a triode Q7, the other end of the resistor R4 is grounded, the collector of a triode Q7 is connected with +10V of the power supply, the emitter of a triode Q7 is respectively connected with one end of a resistor R5, the cathode of a diode D2, one end of a resistor R15 and the anode of a diode D3, the other end of a resistor R5 is grounded, the anode of the diode D2 is respectively connected with the other end of the resistor R2, one end of the resistor R2 and one end of the resistor R2, the other end of the resistor R2 is respectively connected with one end of the resistor R2 and the emitter of the triode Q2, the other end of the resistor R2 is respectively connected with one end of the power supply and the resistor R2 +10V of, the cathode of the diode D3 is connected with one end of the resistor R19, the other end of the resistor R19 is connected with one end of the capacitor C4 and the cathode of the varactor BD2 respectively, the other end of the capacitor C4, one end of the variable capacitor C5 and one end of the inductor L3 are connected to the resonant circuit of the radio frequency transmitting module and the radio frequency receiving module, and the anode of the varactor BD2, the other end of the variable capacitor C5 and the other end of the inductor L3 are connected to the ground.
3. The unmanned aerial vehicle wireless charging safety early warning system as claimed in claim 1, wherein the energy storage module includes a resistor R20, one end of the resistor R20 is connected to a temperature signal detected by a temperature sensor during charging of the battery, the other end of the resistor R20 is connected to a non-inverting input terminal of an operational amplifier AR2, one end of a resistor R21, and one end of a capacitor C6, an inverting input terminal of the operational amplifier AR2 is connected to ground through a resistor R22, an output terminal of the operational amplifier AR2 is connected to the other end of a resistor R21, the other end of a capacitor C6, and a cathode of a stabilivolt Z3, an anode of the stabilivolt Z3 is connected to a base of a high-power transistor VT 6, a collector of the high-power transistor VT1 is connected to one end of an inductor L1, a cathode of a diode D6, and an anode of a diode D8, and an emitter of the high-power transistor 1 is connected to a collector of the, The negative electrode of the diode D7, one end of the capacitor C7, the base of the high-power transistor VT2 are connected with the emitter of the triode Q3, the other end of the capacitor C7 are respectively connected with the negative electrode of the diode D8 and the positive electrode of the diode D9, the negative electrode of the diode D9 is respectively connected with one end of the capacitor C8 and the positive electrode of the diode D10, the negative electrode of the diode D10 is connected with one end of the inductor L2, the other end of the inductor L1, the other end of the inductor L2 and one end of the normally closed contact K1-1 of the relay K1 are connected with the output voltage of the voltage stabilizing module, the other end of the normally closed contact K1-1 is connected with the positive electrode of the battery P1, the emitter of the high-power transistor VT2, the positive electrode of the diode D7, the.
4. The unmanned aerial vehicle wireless charging safety early warning system of claim 1, wherein the power abnormality detection module comprises a resistor R1, a resistor R3 and an operational amplifier AR1, one end of the resistor R1 is connected with a power signal received by the radio frequency receiving module, one end of the resistor R3 and a non-inverting input end of the operational amplifier AR1 are connected with a power signal transmitted by the radio frequency transmitting module, the other end of the resistor R3 is connected to ground, an inverting input end of the operational amplifier AR1 is connected with the other end of the resistor R1 and one end of the resistor R2 respectively, an output end of the operational amplifier AR1 is connected with the other end of the resistor R2 and one end of the resistor R4 respectively, the other end of the resistor R4 is connected with a negative electrode of the regulator tube Z1 and a negative electrode of the regulator tube Z2, a positive electrode of the regulator tube Z1 is connected with one end of the resistor R5, a base electrode of the triode Q1 and an emitter of, The collector of the triode Q1 is connected with the ground, the emitter of the triode Q1 is respectively connected with the base of the triode Q2 and the base of the triode Q3, the collector of the triode Q3 is connected with the anode of the voltage regulator tube Z2, the collector of the triode Q2 outputs a difference signal when the power is normal, and the emitter of the triode Q3 outputs a difference signal when the power is abnormally high;
the early warning module comprises a unijunction transistor T1, wherein an emitter of the unijunction transistor T1 is respectively connected with an anode of a variable capacitance diode DC1 and one end of a resistor R10, a cathode of the variable capacitance diode DC1 is connected with one end of a capacitor C2 and an output end of an operational amplifier AR2, the other end of the capacitor C2 is connected with the ground, a second base of the unijunction transistor T1 is connected with one end of a resistor R11, the other end of the resistor R11 and the other end of the resistor R10 are connected with a temperature signal detected by a temperature sensor during battery charging, a first base of the unijunction transistor T1 is respectively connected with one end of a resistor R12, a cathode of a stabilivolt Z4 and a cathode of a stabilivolt Z5, the other end of the resistor R12 is connected with the ground, an anode of the stabilivolt Z4 is connected with the ground, an anode of the stabilivolt Z5 is connected with a base of a high-power transistor VT3, a collector of the high-power transistor VT3, an emitter of the high-power transistor VT3 is connected with a collector of the high-power transistor VT4, a cathode of the diode D5 and an anode of the diode D4 respectively, a base of the high-power transistor VT4 is connected with a collector of the triode Q2, an emitter of the high-power transistor VT4, an anode of the diode D5 and an emitter of the high-power transistor VT5 are connected with one end of a coil of the relay K1, the other end of the coil of the relay K1 is connected with the ground, a base of the high-power transistor VT5 is connected with an anode of the voltage regulator tube Z6, and a cathode of the voltage regulator tube Z6 is connected with an.
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| CN116865560B (en) * | 2023-09-05 | 2023-12-29 | 深圳市力生美半导体股份有限公司 | Switching power supply output control circuit and output control method |
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