CN210404802U - Intelligent wireless charging control circuit capable of automatically powering off - Google Patents
Intelligent wireless charging control circuit capable of automatically powering off Download PDFInfo
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- CN210404802U CN210404802U CN201921761336.4U CN201921761336U CN210404802U CN 210404802 U CN210404802 U CN 210404802U CN 201921761336 U CN201921761336 U CN 201921761336U CN 210404802 U CN210404802 U CN 210404802U
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Abstract
The utility model relates to the technical field of wireless charging of electronic products, and discloses an intelligent wireless charging control circuit which has higher safety and stable output voltage and can automatically cut off power, wherein a pulse generation circuit is used for generating pulse frequency; the induction circuit is used for receiving the electromagnetic wave signal output by the wireless transmitting circuit and charging a load; the input end of the charging detection circuit is connected with the output end of the wireless transmitting circuit and is used for detecting the electromagnetic wave signal output by the wireless transmitting circuit; the input end of the intelligent power-off circuit is connected with the output end of the charging detection circuit, if the load is fully charged or does not have an inductive load, the charging detection circuit outputs a low level, and the low level is used for triggering the intelligent power-off circuit to be powered off, so that the whole circuit is in a complete power-off state.
Description
Technical Field
The utility model relates to a wireless technical field that charges of electronic product, more specifically say, relate to a but wireless charging control circuit of intelligence of auto-power-off.
Background
The charger of electronic product is comparatively common charging source in daily life, and the current commonly used is that the data line plug-in type charges, and this kind of charging mode data line interface has used for a long time and has had phenomenons such as contact failure usually, and single charger adaptation face is not wide moreover, because of the electronic product of different grade type needs to use different chargers, still will look for suitable socket and reason in the same order the wiring during charging, really wastes time and energy.
Therefore, the wireless charger applicable to various electronic products is provided, and the defects of poor contact of the charging mode data line interface and poor adaptability of a single charger can be effectively overcome. However, in the charging process of the conventional wireless charger, when the electric quantity of the electronic product is fully charged, the charger still charges the electronic product, and when the wireless charger is used for a long time, the surface of the storage battery is bulged or the capacity parameter is reduced, so that the service life of the storage battery is reduced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, when being full of to the electric quantity of the above-mentioned electronic product of prior art, the charger still charges to the electronic product and causes the defect that the life of battery descends, provides the higher and stable intelligent wireless charging control circuit who can auto-power-off of output voltage of security.
The utility model provides a technical scheme that its technical problem adopted is: an intelligent wireless charging control circuit capable of automatically powering off is constructed, and comprises a pulse generation circuit, a power amplification circuit, a wireless transmitting circuit, an induction circuit, a charging detection circuit and an intelligent power-off circuit;
the pulse generating circuit is used for generating pulse frequency;
the input end of the power amplification circuit is connected with the input end of the pulse generation circuit and is used for receiving the pulse frequency output by the pulse generation circuit;
the input end of the wireless transmitting circuit is coupled with the output end of the power amplifying circuit, and the wireless transmitting circuit converts the pulse frequency into an electromagnetic wave signal to be output;
the induction circuit is used for receiving the electromagnetic wave signal output by the wireless transmitting circuit and charging a load;
the input end of the charging detection circuit is connected with the output end of the wireless transmitting circuit and is used for detecting the electromagnetic wave signal output by the wireless transmitting circuit;
the input end of the intelligent power-off circuit is connected with the output end of the charging detection circuit, if the load is fully charged or has no inductive load, the charging detection circuit outputs a low level, and the low level is used for triggering the intelligent power-off circuit to be powered off, so that the whole circuit is in a complete power-off state.
In some embodiments, the pulse generating circuit is provided with a controller, a first resistor, a first adjustable resistor and a first capacitor,
the first resistor, the first adjustable resistor and the first capacitor are connected in sequence;
the reset end of the controller is connected with one end of the first resistor, and the output end of the controller is connected with the input end of the power amplification circuit.
In some embodiments, the power amplifying circuit includes a first field effect transistor, a second field effect transistor, a first triode, a second resistor, a third resistor, a fourth resistor, and a first diode,
the base electrode of the first triode and the grid electrode of the second field effect transistor are connected with the output end of the controller;
the source electrodes of the first field effect transistor and the second field effect transistor are connected with the input end of the charging detection circuit;
the drain electrodes of the first field effect transistor and the second field effect transistor are connected with the input end of the wireless transmitting circuit;
the cathode of the first diode is connected with the grid electrode of the first field effect transistor, and the anode of the first diode is coupled with the collector electrode of the first triode;
the second resistor, the third resistor and the fourth resistor are sequentially connected, one end of the second resistor is connected with the grid electrode of the second field effect transistor, and the other end of the second resistor is connected with the base electrode of the first triode;
one end of the third resistor and one end of the fourth resistor are connected with the emitting electrode of the first triode together, and the other end of the fourth resistor is connected with the source electrode of the first field effect transistor.
In some embodiments, the charge detection circuit includes an amplifier, a comparator, a sixth resistor, a seventh resistor, an eighth resistor, and a second capacitor,
the non-inverting input end of the amplifier is connected with the source electrodes of the first field effect transistor and the second field effect transistor through the sixth resistor;
the inverting input end of the amplifier is connected with one end of the seventh resistor and one end of the eighth resistor;
and the output end of the amplifier is connected with the other end of the eighth resistor and the non-inverting input end of the comparator together.
In some embodiments, the intelligent power-off circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second triode, a third triode, a fourth triode, a first relay and a second relay,
one end of the eleventh resistor is connected with the output end of the charging detection circuit, and the other end of the eleventh resistor is coupled to the base electrode of the second triode;
the collector of the second triode is connected with the base of the third triode and the movable contact of the second relay together;
the collector of the second triode and the base of the third triode are connected with the coil of the second relay through the twelfth resistor and the thirteenth resistor which are connected in series;
and the emitter of the third triode is connected with the base of the fourth triode, the emitter of the fourth triode is connected with one end of the first relay coil, and the collector of the fourth triode is connected with the other end of the first relay coil.
In some embodiments, the intelligent power down circuit further comprises a transformer, a tenth capacitor, an eleventh capacitor and a fifth triode,
the tenth capacitor and the eleventh capacitor are connected in series;
one end of a primary coil of the transformer is connected with the movable contact of the first relay, and the other end of the primary coil of the transformer is connected with a power supply input end;
one end of the secondary coil of the transformer is connected with one end of the tenth capacitor and the base electrode of the fifth triode together;
and the other end of the secondary coil of the transformer is commonly connected with one end of the eleventh capacitor and the emitter of the fifth triode.
In some embodiments, the wireless transmission circuitry and the induction circuitry comprise at least one inductive coil.
In the intelligent wireless charging control circuit capable of automatically powering off, the pulse generating circuit generates pulse frequency, the power amplifying circuit is then input to amplify the input pulse frequency and output to the wireless transmitting circuit, the wireless transmitting circuit converts the pulse frequency into electromagnetic wave signals, and the electromagnetic wave signals output by the wireless transmitting circuit are sensed and received by the sensing circuit so as to charge a load; at the moment, the input end of the charging detection circuit is connected with the output end of the wireless transmitting circuit and used for detecting the electromagnetic wave signal output by the wireless transmitting circuit, if the load is fully charged or does not have an inductive load, the charging detection circuit outputs a low level, and the low level is used for triggering the intelligent power-off circuit to be powered off so that the whole circuit is in a complete power-off state. Compared with the prior art, the utility model discloses the charged state of detectable electronic product (being the load), the low level of charge detection circuit exportable is used for triggering intelligent power-off circuit and cuts off the power of whole circuit, on the one hand, can improve the security of load; on the other hand, the charging voltage output by the wireless charging control circuit is stable, and the service life of the storage battery can be effectively prolonged.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1a is a partial circuit diagram of an embodiment of an intelligent wireless charging control circuit capable of automatically powering off according to the present invention;
FIG. 1b is a circuit diagram of a coil part according to an embodiment of the intelligent wireless charging control circuit capable of automatically powering off;
fig. 1c is a partial circuit diagram of another embodiment of the intelligent wireless charging control circuit capable of automatically powering off according to the present invention;
fig. 1d is a partial circuit diagram of another embodiment of the intelligent wireless charging control circuit capable of automatically powering off.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1a is the utility model provides a but the partial circuit diagram of an intelligent wireless charging control circuit embodiment of auto-power-off, fig. 1b is the utility model provides a but the partial circuit diagram of an intelligent wireless charging control circuit embodiment of auto-power-off receiving coil portion. As shown in fig. 1a and 1b, the utility model discloses a but the first embodiment of the wireless control circuit that charges of intelligence of auto-power-off, but the wireless control circuit that charges of intelligence of auto-power-off includes pulse generation circuit 10, power amplifier circuit 20, wireless transmitting circuit 30, induction circuit 40 and charge detection circuit 50.
Specifically, the pulse generating circuit 10 is used to generate a pulse frequency, for example, a pulse frequency of 36KHZ-38KHZ is generated by a chip in the pulse generating circuit 10, wherein the efficiency can reach the highest value when the pulse frequency is 36.7KHZ at the time of specific debugging.
Further, the pulse generating circuit 10 outputs the generated pulse frequency to the power amplifying circuit 20.
The power amplifier circuit 20 has a function of pulse power amplification. Specifically, the input end of the power amplifying circuit 20 is connected to the input end of the pulse generating circuit 10, and is configured to receive the pulse frequency output by the pulse generating circuit 10, amplify the pulse frequency, and output the amplified pulse frequency to the wireless transmitting circuit 30.
The wireless transmission circuit 30 functions to generate electromagnetic waves and transmit the electromagnetic waves. Specifically, the input end of the wireless transmitting circuit 30 is coupled to the output end of the power amplifying circuit 20, and the wireless transmitting circuit 30 converts the pulse frequency into an electromagnetic wave signal, and generates an induced current by electromagnetic induction to output to the induction circuit 50.
The sensing circuit 50 is used for receiving the electromagnetic wave signal output by the wireless transmitting circuit 30, so as to charge the load. Specifically, the sensing circuit 50 is provided with an induction coil, that is, when the induction coil is close to the transmitting coil of the wireless transmitting circuit 30, an induction current can be generated, after full-wave rectification is performed by the internal circuit (and the rectifying circuit, the voltage stabilizing circuit and the amplifying circuit) of the sensing circuit 50, different voltage stabilizing diodes can be selected to stabilize voltage according to the charging voltage of different electronic products, and then the current is amplified by the triode and supplied to different electronic products for charging.
In this embodiment, utilize the electromagnetic induction principle through wireless charger, belong to non-contact charging system, no longer transmit the electric energy through wire (charging wire), but wireless transmission mode charges, does not have the used physical interface that charges, compares with general charger, has avoided the trouble of plug wire or pulling out the battery. The design of charging a plurality of (inductive loads) and intelligent charging can be realized by one (charger), the charger can charge a plurality of loads simultaneously, whether the loads charge or not can be automatically sensed, automatic charging is achieved, the wireless charger is very convenient to use, the requirement of one family can be met by one charger, and the wireless charger has the advantages of high popularization and application value, low cost and the like.
Fig. 1c is the partial circuit diagram of another embodiment of the intelligent wireless charging control circuit that can automatically power off, fig. 1d is the partial circuit diagram of another embodiment of the intelligent wireless charging control circuit that can automatically power off that the utility model provides a. As shown in fig. 1c and fig. 1d, the intelligent wireless charging control circuit capable of automatically powering off is further provided with an intelligent power-off circuit 60.
Further, an input terminal of the charging detection circuit 50 is connected to an output terminal of the wireless transmission circuit 30, and is used for detecting the electromagnetic wave signal output by the wireless transmission circuit 30, and the charging detection circuit 50 outputs the detected electromagnetic wave signal to the intelligent power-off circuit 60.
The intelligent power-off circuit 60 has the functions of detecting the charging capacity of the load and the power-off when the load is fully charged.
The input end of the intelligent power-off circuit 60 is connected with the output end of the charging detection circuit 50, if the load is fully charged or has no inductive load, the charging detection circuit 50 outputs a low-level signal to the intelligent power-off circuit 60, and the low-level signal is used for triggering the intelligent power-off circuit to work and disconnecting the input power supply, so that the whole circuit is in a complete power-off state.
For example, when an inductive load is placed on the charger, the charging can be automatically induced, and information is fed back; when the induction load is fully charged, the power is automatically cut off after 10 seconds of internal setting, the intellectualization of the charging process is realized, and on one hand, the safety of the load can be improved; on the other hand, the charging voltage output by the wireless charging control circuit is stable, and the service life of the storage battery can be effectively prolonged.
In some embodiments, in order to improve the stability of the pulse signal, the pulse generating circuit 10 may be provided with a controller U1, a first resistor R1, a first adjustable resistor RP1 and a first capacitor C1. The controller U1 is configured to generate a pulse signal, and is provided with a reset terminal (REST), a trigger Terminal (THR), a Threshold (THRG), an output terminal (OUT), a discharge terminal (DSC), a common terminal (GND), and a power input terminal (VCC).
Specifically, the first resistor R1, the first adjustable resistor RP1 and the first capacitor C1 are sequentially connected, an adjustable end of the first adjustable resistor RP1 is connected to a discharge end (DSC) of the controller U1, and the other end of the first capacitor C1 is connected to a common end.
The reset terminal (REST) of the controller U1 is commonly connected to the power input terminal (VCC) and one end of the first resistor R1, and the output terminal (OUT) of the controller is connected to the input terminal of the power amplifier circuit 20.
In some embodiments, in order to increase the amplification factor of the pulse signal, a first fet VT1, a second fet VT2, a first transistor Q1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first diode D1 may be disposed in the power amplifier circuit 20. The first triode Q1 has an amplifying function.
Specifically, the base of the first transistor Q1 and the gate of the second fet VT2 are connected to the output terminal (OUT) of the controller U1, for receiving the pulse signal outputted by the controller U1.
The sources of the first fet VT1 and the second fet VT2 are connected to the input terminal of the charge detection circuit 40, and the drains of the first fet VT1 and the second fet VT2 are connected to the input terminal of the wireless transmission circuit 30.
The cathode of the first diode D1 is connected to the gate of the first fet VT1, and the anode of the first diode D1 is coupled to the collector of the first transistor Q1.
The second resistor R2, the third resistor R3 and the fourth resistor R4 are sequentially connected, one end of the second resistor R2 is connected with the grid electrode of the second field-effect transistor VT2, and the other end of the second resistor R2 is connected with the base electrode of the first triode Q1.
One end of the third resistor R3 and one end of the fourth resistor R4 are commonly connected to the emitter of the first transistor Q1, and the other end of the fourth resistor R4 is connected to the source of the first fet VT 1.
The power amplifier circuit 20 mainly amplifies a 36.7KHZ pulse signal power inputted by the controller U1, and outputs the amplified signal power from the wireless transmitter circuit 30.
The working principle is as follows: when the pulse signal is at a high level, the gate of the second fet VT2 is at a high level, the second fet VT2 is turned on, the first transistor Q1 is saturated, the voltage of Uceq is only 0.67V, the gate voltage of the first fet VT1 is 0 after passing through the first diode D1, and the first fet VT1 is turned off.
When the pulse signal is at a low level, the first triode Q1 and the second field effect transistor VT2 are simultaneously turned off, the current is directly conducted by the fifth resistor R5, the first diode D1, the first field effect transistor VT1 and the first field effect transistor VT1, and the first field effect transistor VT1 and the second field effect transistor VT2 both work in an on-off mode in the whole process.
In some embodiments, in order to improve the safety of the load charging, an amplifier a1, a comparator a2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a second capacitor C2 may be disposed in the charging detection circuit 40. The amplifier a1 has the function of amplifying a signal, the comparator a2 can compare the input signal with a reference signal and then output a high level or low level signal, the sixth resistor R6 is an input resistor, the seventh resistor R7 is a balance resistor, and the eighth resistor R8 is a feedback resistor.
Specifically, the non-inverting input terminal (corresponding to pin 3) of the amplifier a1 is commonly connected to the sources of the first fet VT1 and the second fet VT2 through the sixth resistor R6, and receives the pulse signal input through the power amplification circuit 20, and the inverting input terminal (corresponding to pin 2) of the amplifier a1 is commonly connected to one end of the seventh resistor R7 and one end of the eighth resistor R8.
The output end of the amplifier A1 is commonly connected with the other end of the eighth resistor R8 and the non-inverting input end of the comparator A2, the inverting input end of the comparator A2 is connected with the reference signal or reference voltage end, and the output end of the comparator A2 is connected with the input end of the intelligent power-off circuit 60.
For example, when an inductive load exists, the voltage of the fourth resistor R4 is increased, the voltage is obviously increased after being amplified by the amplifier a1, the voltage U1 is obtained after rectification and filtering and compared with a reference source Uo, when U1 is greater than Uo, the output Ui of the comparator a2 is high level, and the charging indicator lamp flickers; when the inductive load is fully charged (or no load is sensed), and U1 < UO, comparator A2 outputs Ui as low level, and green light is on, indicating full or no load is sensed.
In some embodiments, in order to improve the safety of the load charging, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a first relay K1, a second relay K2, a transformer TR, a tenth capacitor C10, an eleventh capacitor C11 and a fifth transistor Q5 may be disposed in the intelligent power-off circuit 60.
One end of an eleventh resistor R11 is connected to an output end of the comparator a2 (belonging to the charging detection circuit), the other end of the eleventh resistor R11 is coupled to a base of the second transistor Q2, and a collector of the second transistor Q2 is connected to a base of the third transistor Q3 and a moving contact (corresponding to pin 1) of the second relay K2.
The twelfth resistor R12 is connected in series with the thirteenth resistor R13, and the collector of the second triode Q2 and the base of the third triode Q3 are connected together with the coil (corresponding to 4 pins) of the second relay K2 through the twelfth resistor R12 and the thirteenth resistor R13 connected in series.
An emitting electrode of the third triode Q3 is connected with a base electrode of the fourth triode Q4, an emitting electrode of the fourth triode Q4 is connected with one end of a coil (corresponding to 4 pins) of the first relay K1, and a collecting electrode of the fourth triode Q4 is connected with the other end of the coil (corresponding to 5 pins) of the first relay K1.
Wherein, a reset switch S1 is arranged between the movable contact (corresponding to 1 pin) and the fixed contact (corresponding to 3 pins) of the first relay K1. A normally open switch S2 is provided at a movable contact (corresponding to pin 1) of the first relay K1 and one end (corresponding to N1) of the primary coil of the transformer TR, and the other end (corresponding to N3) of the primary coil of the transformer TR is connected to an input terminal of 220 ac power.
Further, a tenth capacitor C10 and an eleventh capacitor C11 are serially connected, and one end (corresponding to N1) of the primary coil of the transformer TR is connected to the movable contact (corresponding to pin 1) of the first relay K1.
One end (corresponding to N2) of the secondary coil of the transformer TR is commonly connected to one end of the tenth capacitor C10 and the base of the fifth transistor Q5, and the other end (corresponding to N4) of the secondary coil of the transformer TR is commonly connected to one end of the eleventh capacitor C11 and the emitter of the fifth transistor Q5.
The working principle is as follows: when the normally open switch S2 is turned off, the wireless charging control circuit is in an intelligent charging state. When the charger is started, the first relay K1 is closed, while the second relay K2 is in an open state. When an inductive load exists, the charging indicator light flickers, the Ui output by the comparator A2 is at a high level, at the moment, the second triode Q2 is saturated, the voltage Uceq is 0.67V and is lower than the sum of the conducting voltages (namely 1.34V) of the third triode Q3 and the fourth triode Q4, the third triode Q3 and the fourth triode Q4 form Darlington, the Darlington is cut off at the same time, and the first relay K1 is attracted; when the inductive load is fully charged (or has no inductive load), a green lamp is turned on, namely Ui output by the comparator A2 is at a low level, the second triode Q2 is cut off, the capacitor C5 and the capacitor R9 form an RC charging circuit, when the charging voltage of the capacitor reaches the conducting voltage of the third triode Q3 and the fourth triode Q4, the third triode Q3 is conducted, the fourth triode Q4 is saturated, the working voltage of the relay is only 0.67V at the moment, the first relay K1 is disconnected, and the whole circuit is in a complete power-off state.
After power failure, the relay K2 is closed, and at this time, the ninth capacitor C9 and the thirteenth resistor R13 form an RC discharge circuit to rapidly discharge the ninth capacitor C9. When the tact reset switch S1 is pressed, the charger restarts. When the inductive load is fully charged (or no inductive load), the ninth capacitor C9 is charged, and the 10-second automatic power-off is realized. If the inductive load exists within 10 seconds of the turning-on of the green light, Ui is high level, the second triode Q2 is saturated, the ninth capacitor C9 discharges, and the whole charging process realizes intelligent power-off.
When the market switch S2 is closed, the entire charging circuit is in the process of manual power down.
In some embodiments, in order to improve the transmission performance of electromagnetic induction, inductance coils (H1, H2, and H3) may be disposed in the wireless transmission circuit 30 and the induction circuit 50. The inductive coils (H1, H2) form a transmitting coil, and the inductive coil H3 is a receiving coil.
As shown in fig. 1b, the sensing circuit 50 includes a sixth transistor Q6, a twelfth transistor D10, a sixteenth resistor R16, a sixteenth capacitor C16, a seventeenth capacitor C17, and a rectifier bridge D11.
Specifically, the emitter of the sixth transistor Q6 is connected to the input terminal of the load, and the induced current is input to the load through the sixth transistor Q6.
The base of the sixth triode Q6 is commonly connected to the cathode of the twelfth diode D10, the sixteenth resistor R16 and one end of the sixteenth capacitor C16, and the other end of the sixteenth capacitor C16 is commonly connected to the anode of the twelfth diode D10 and the output end (positive half cycle) of the rectifier bridge D11.
The other end of the sixteenth resistor R16 is connected to one end of the seventeenth capacitor C17 and the output end (negative half cycle) of the rectifier bridge D11.
The input end (positive half cycle) of rectifier bridge D11 at one end of inductor H3 is connected, and the input end (negative half cycle) of rectifier bridge D11 at the other end of inductor H3 is connected, and receives electromagnetic wave signals sent by inductors (H1, H2).
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (7)
1. An intelligent wireless charging control circuit capable of automatically powering off is characterized by comprising a pulse generating circuit, a power amplifying circuit, a wireless transmitting circuit, an induction circuit, a charging detection circuit and an intelligent power-off circuit,
the pulse generating circuit is used for generating pulse frequency;
the input end of the power amplification circuit is connected with the input end of the pulse generation circuit and is used for receiving the pulse frequency output by the pulse generation circuit;
the input end of the wireless transmitting circuit is coupled with the output end of the power amplifying circuit, and the wireless transmitting circuit converts the pulse frequency into an electromagnetic wave signal to be output;
the induction circuit is used for receiving the electromagnetic wave signal output by the wireless transmitting circuit and charging a load;
the input end of the charging detection circuit is connected with the output end of the wireless transmitting circuit and is used for detecting the electromagnetic wave signal output by the wireless transmitting circuit;
the input end of the intelligent power-off circuit is connected with the output end of the charging detection circuit, if the load is fully charged or has no inductive load, the charging detection circuit outputs a low level, and the low level is used for triggering the intelligent power-off circuit to be powered off, so that the whole circuit is in a complete power-off state.
2. The intelligent wireless charging control circuit capable of automatically powering off according to claim 1, wherein the pulse generation circuit is provided with a controller, a first resistor, a first adjustable resistor and a first capacitor,
the first resistor, the first adjustable resistor and the first capacitor are connected in sequence;
the reset end of the controller is connected with one end of the first resistor, and the output end of the controller is connected with the input end of the power amplification circuit.
3. The intelligent wireless charging control circuit capable of automatically powering off according to claim 2, wherein the power amplifying circuit comprises a first FET, a second FET, a first triode, a second resistor, a third resistor, a fourth resistor and a first diode,
the base electrode of the first triode and the grid electrode of the second field effect transistor are connected with the output end of the controller;
the source electrodes of the first field effect transistor and the second field effect transistor are connected with the input end of the charging detection circuit;
the drain electrodes of the first field effect transistor and the second field effect transistor are connected with the input end of the wireless transmitting circuit;
the cathode of the first diode is connected with the grid electrode of the first field effect transistor, and the anode of the first diode is coupled with the collector electrode of the first triode;
the second resistor, the third resistor and the fourth resistor are sequentially connected, one end of the second resistor is connected with the grid electrode of the second field effect transistor, and the other end of the second resistor is connected with the base electrode of the first triode;
one end of the third resistor and one end of the fourth resistor are connected with the emitting electrode of the first triode together, and the other end of the fourth resistor is connected with the source electrode of the first field effect transistor.
4. The intelligent wireless charging control circuit capable of automatically powering off according to claim 3, wherein the charging detection circuit comprises an amplifier, a comparator, a sixth resistor, a seventh resistor, an eighth resistor and a second capacitor,
the non-inverting input end of the amplifier is connected with the source electrodes of the first field effect transistor and the second field effect transistor through the sixth resistor;
the inverting input end of the amplifier is connected with one end of the seventh resistor and one end of the eighth resistor;
and the output end of the amplifier is connected with the other end of the eighth resistor and the non-inverting input end of the comparator together.
5. The intelligent wireless charging control circuit capable of automatically powering off according to claim 1, wherein the intelligent power-off circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second transistor, a third transistor, a fourth transistor, a first relay and a second relay,
one end of the eleventh resistor is connected with the output end of the charging detection circuit, and the other end of the eleventh resistor is coupled to the base electrode of the second triode;
the collector of the second triode is connected with the base of the third triode and the movable contact of the second relay together;
the collector of the second triode and the base of the third triode are connected with the coil of the second relay through the twelfth resistor and the thirteenth resistor which are connected in series;
and the emitter of the third triode is connected with the base of the fourth triode, the emitter of the fourth triode is connected with one end of the first relay coil, and the collector of the fourth triode is connected with the other end of the first relay coil.
6. The intelligent wireless charging control circuit capable of automatically powering off according to claim 5, wherein the intelligent power-off circuit further comprises a transformer, a tenth capacitor, an eleventh capacitor and a fifth triode,
the tenth capacitor and the eleventh capacitor are connected in series;
one end of a primary coil of the transformer is connected with the movable contact of the first relay, and the other end of the primary coil of the transformer is connected with a power supply input end;
one end of the secondary coil of the transformer is connected with one end of the tenth capacitor and the base electrode of the fifth triode together;
and the other end of the secondary coil of the transformer is commonly connected with one end of the eleventh capacitor and the emitter of the fifth triode.
7. The intelligent wireless charging control circuit that can automatically power off of claim 1, wherein the wireless transmitting circuit and the induction circuit comprise at least one inductive coil.
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| CN201921761336.4U CN210404802U (en) | 2019-10-18 | 2019-10-18 | Intelligent wireless charging control circuit capable of automatically powering off |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949040A (en) * | 2021-10-19 | 2022-01-18 | 浙江法然特浙科科技有限公司 | Automatic power-off charger system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949040A (en) * | 2021-10-19 | 2022-01-18 | 浙江法然特浙科科技有限公司 | Automatic power-off charger system |
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