CN214959538U - Wireless transmitting circuit and device - Google Patents
Wireless transmitting circuit and device Download PDFInfo
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- CN214959538U CN214959538U CN202120452430.2U CN202120452430U CN214959538U CN 214959538 U CN214959538 U CN 214959538U CN 202120452430 U CN202120452430 U CN 202120452430U CN 214959538 U CN214959538 U CN 214959538U
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Abstract
The wireless transmitting circuit comprises a power supply circuit, a coil receiving and transmitting circuit, a microcontroller, a driving circuit, a current detection circuit, an indicating circuit and a detection decoding circuit, wherein the driving circuit is connected with the coil receiving and transmitting circuit and the microcontroller; the current detection circuit and the indicating circuit multiplex the same I/O port of the microcontroller, one I/O port is saved, the microcontroller can adopt a packaging device with fewer pins, a peripheral circuit is simplified, the occupied space of the circuit is small, and the cost is low.
Description
Technical Field
The present application relates to the field of wireless signal transmission, and in particular, to a wireless transmission circuit and device.
Background
In recent years, wireless charging gradually changes our lives, and along with introduction of wireless charging technology into a series of consumer electronics products such as mobile phones, tablet computers and watches, wireless charging has a very wide development prospect. Although wireless charging technology is more and more mature, most wireless chargers do not adopt a unified standard, the universality is not strong, and a matched charging receiving terminal is required to be adopted, so that the development of the wireless charger is severely limited. Qi is a Wireless charging standard provided by the Wireless Power Consortium (WPC), which is the first global organization for promoting Wireless charging technology, and has two major features of convenience and universality. First, different brands of products, as long as there is a Qi logo, can be charged with Qi wireless chargers. Secondly, it has overcome the technical bottleneck of wireless charging "commonality", and in the near future, intelligent products such as cell-phone, camera, computer can all use Qi wireless charger to charge, provide probably for the large-scale application of wireless charging.
In some small household electrical appliance consumer electronic products, there is a need for supporting a wireless transmitting circuit of 5W or more of Qi standard, and in the wireless transmitting scheme of Qi standard in the market, a Microcontroller (Microcontroller Unit, MCU) is packaged with more than 16 pins, and peripheral circuits are complex and are easily interfered by power supply fluctuation, which leads to an increase in error rate, and many required components, occupy a large space and have high cost.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a wireless transmitting circuit and a wireless transmitting device, and aims to solve the problems that a main control peripheral circuit of a traditional wireless transmitting circuit is complex, large in occupied space and high in cost.
A first aspect of the present application provides a wireless transmission circuit, including: the device comprises a power supply circuit, a coil transceiving circuit, a microcontroller, a driving circuit connected with the coil transceiving circuit and the microcontroller, a current detection circuit connected with the driving circuit and the microcontroller, an indicating circuit connected with the microcontroller and a detection decoding circuit connected with the coil transceiving circuit and the microcontroller; the current detection circuit and the indication circuit multiplex the same I/O port of the microcontroller.
In one embodiment, the microcontroller is an 8-pin packaged device.
In one embodiment, the detector decoding circuit comprises a detector diode, a high frequency filter capacitor, a coupling capacitor, a first resistor, a second resistor, and a third resistor, wherein:
the anode of the detection diode is connected with a coil of the receiving and transmitting circuit, the cathode of the detection diode is connected with the first end of the first resistor, the second end of the first resistor is grounded through the high-frequency filter capacitor, the second end of the first resistor is grounded through the second resistor, the second end of the first resistor is also connected with the first end of the coupling capacitor, the second end of the coupling capacitor is grounded through the third resistor, and the second end of the coupling capacitor is also connected with the decoding I/O port of the microcontroller.
In one embodiment, the current detection circuit is used for detecting the current flowing to the ground of the driving circuit and transmitting a detected current signal to the microcontroller, and the microcontroller controls the driving circuit to carry out current limiting and short-circuit protection according to the current signal.
In one embodiment, the current detection circuit includes a first capacitor, a fourth resistor, and a sampling resistor, wherein:
the first end of the fourth resistor is connected with the port of the driving circuit to the ground, the first end of the fourth resistor is grounded through the sampling resistor, the second end of the fourth resistor is connected with the current detection I/O port of the microcontroller, and the second end of the fourth resistor is grounded through the first capacitor.
In one embodiment, the indication circuit is configured to indicate an operating state, a power-up state, and a power-down state of the wireless transmission circuit.
In one embodiment, the indicating circuit includes a first LED lamp, a second LED lamp, a first current limiting resistor, a second current limiting resistor, wherein:
the positive pole of the first LED lamp is connected with a current detection I/O port of the microcontroller through a first current limiting resistor, the negative pole of the first LED lamp is grounded, the positive pole of the second LED lamp is connected with a driving I/O port of the microcontroller through a second current limiting resistor, and the negative pole of the second LED lamp is grounded.
In one embodiment, the wireless transmission circuit further comprises a temperature detection circuit connected with the microcontroller for detecting the temperature and transmitting a detected temperature signal to the microcontroller, and the microcontroller adjusts the output power of the driving circuit according to the temperature signal.
In one embodiment, the temperature detection circuit includes a thermistor, a voltage dividing resistor, and a filter capacitor, wherein:
the first end of the thermistor is connected with a temperature detection I/O port of the microcontroller, the first end of the thermistor is also connected with an output anode of the power supply circuit through a divider resistor, the first end of the thermistor is also grounded through a filter capacitor, and the second end of the thermistor is grounded.
A second aspect of the present application provides a wireless transmitting apparatus, including the wireless transmitting circuit provided above.
Compared with the prior art, the application has the beneficial effects that: the wireless transmitting circuit is composed of the power supply circuit, the microcontroller, the driving circuit, the coil transceiving circuit, the current detection circuit, the indicating circuit and the detection decoding circuit, the peripheral circuit is simple, decoding is simpler and more reliable, the current detection circuit and the indicating circuit multiplex the same I/O port of the microcontroller, one I/O port is saved, the microcontroller can adopt a packaging device with fewer pins, the peripheral circuit is concise, the circuit occupation space is small, and the cost is low.
Drawings
Fig. 1 is a schematic structural diagram of a wireless transmitting circuit according to an embodiment of the present application;
FIG. 2 is an exemplary circuit schematic of a microcontroller of the wireless transmit circuit shown in FIG. 1;
FIG. 3 is an exemplary circuit schematic of a power supply circuit of the wireless transmit circuit shown in FIG. 1;
FIG. 4 is an exemplary circuit schematic of a drive circuit of the wireless transmit circuit shown in FIG. 1;
FIG. 5 is an exemplary circuit schematic of a coil transceiver circuit of the wireless transmitter circuit shown in FIG. 1;
FIG. 6 is an exemplary circuit schematic of a detector decoder circuit of the wireless transmitter circuit shown in FIG. 1;
FIG. 7 is an exemplary circuit schematic of the current sense circuit of the wireless transmit circuit shown in FIG. 1;
FIG. 8 is an exemplary circuit schematic of an indicator circuit of the wireless transmit circuit shown in FIG. 1;
fig. 9 is a schematic structural diagram of a wireless transmitting circuit according to another embodiment of the present application;
fig. 10 is an exemplary circuit schematic of the temperature detection circuit of the wireless transmit circuit shown in fig. 1.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, a wireless transmitting circuit according to a first aspect of the embodiments of the present application includes a power supply circuit 20, a microcontroller 10, a driving circuit 30, a coil transceiver circuit 40, a current detection circuit 60, an indication circuit 70, and a detection decoding circuit 50.
The power supply circuit 20 may adopt a USB-5V input or a DC-5V output, referring to fig. 2 and fig. 3, the power supply circuit 20 is connected to a power input VDD of the microcontroller 10, and supplies power to the microcontroller 10 with 5V voltage, which can play a role of protecting the circuit and solve most of the potential safety hazards. The interface U2 in the power supply circuit 20 is a USB interface, alternatively a normal DC interface may be used.
Optionally, the microcontroller 10 is an 8-pin packaged device, and a packaged device with fewer pins is adopted, so that a peripheral circuit can be simplified, interference caused by power supply fluctuation is reduced, the error rate is reduced, the occupied space is small, and the cost is low.
Referring to fig. 2, the microcontroller 10 may be an 8-pin packaged device, but is not limited to an 8-pin packaged device, and may also be a device packaged with a pin number of 8 pins or more, and specifically, may be a control chip including an internal integrated decoding circuit, for implementing bidirectional communication between the microcontroller and the wireless receiving end.
The driving circuit 30 is connected to the coil transceiver circuit 40 and the microcontroller 10, and is configured to drive the power signal output to the coil transceiver circuit 40.
Referring to fig. 2 and 4, the driving circuit 30 may be a typical full-bridge driving circuit, that is, the output of the upper left arm is connected to the control terminal of the upper right arm, the output of the upper right arm is connected to the control terminal of the upper left arm, the control terminals of the two MOS transistors of the lower left arm and the lower right arm of the driving circuit 30 are respectively connected to the two Pulse signal ports PWM1 and PWM2 of the microcontroller 10, and the driving circuit 30 adjusts the output power according to the variation of two complementary Pulse Width Modulation (PWM) signals output by the two Pulse signal ports PWM1 and PWM2 of the microcontroller 10.
The COIL transceiver circuit 40 may be an LC oscillator circuit, connected to the driving circuit 30 and the detection decoding circuit 50, and configured to transmit a power signal and/or a data signal output by the driving circuit 30, and receive a data signal modulated and transmitted by a wireless receiving end and transmit the data signal to the detection decoding circuit 50, referring to fig. 5, in this embodiment, the COIL transceiver circuit 40 includes a COIL, a second capacitor C3, a third capacitor C4, a fourth capacitor C5, and a fifth capacitor C6. Wherein:
the second capacitor C3, the third capacitor C4, the fourth capacitor C5 and the fifth capacitor C6 are connected in parallel to form a capacitor bank 41, a first end of the capacitor bank 41 is connected to the first signal output terminal AOUT of the driving circuit 30, a second end of the capacitor bank 41 is connected to the second signal output terminal BOUT of the driving circuit 30 through the COIL, specifically, the second end of the capacitor bank 41 is connected to the first end J1 of the COIL, the second end J2 of the COIL is connected to the second signal output terminal BOUT, and a connection point of the COIL and the capacitor bank 41 is connected to the input terminal COMM of the demodulation decoding circuit 50.
Two ends of the COIL are respectively connected with the first signal output terminal AOUT and the second signal output terminal BOUT of the driving circuit 30, and the driving circuit 30 alternately outputs pulse voltage through the first signal output terminal AOUT and the second signal output terminal BOUT according to the PWM signal output by the microcontroller 10, so that the COIL of the COIL transceiver circuit 40 generates an electromagnetic induction signal to realize the reception and transmission of the signal.
The current detection circuit 60 is connected with the driving circuit 30 and the microcontroller 10; the indication circuit 70 is connected to the microcontroller 10; the detection decoding circuit 50 is connected to the coil transceiver circuit 40 and the microcontroller 10.
The wireless transmitting circuit is composed of the power supply circuit 20, the microcontroller 10, the driving circuit 30, the coil transceiving circuit 40, the current detection circuit 60, the indicating circuit 70 and the detection decoding circuit 50, and peripheral circuits are simple, so that decoding is simpler and more reliable.
Optionally, the current detection circuit 60 and the indication circuit 70 multiplex the same I/O port of the microcontroller 10, and one I/O port is saved, so that the microcontroller can adopt a package device with fewer pins, the peripheral circuit becomes simple, the circuit occupies a small space, and the cost is low
Referring to fig. 6, in an embodiment, the detector decoding circuit 50 includes a detector diode D1, a high frequency filter capacitor C1, a coupling capacitor C2, a first resistor R1, a second resistor R2, and a third resistor R3, wherein:
the anode of the detector diode D1 is used as the input COMM of the detector decoder circuit 50, the first end J1 of the COIL of the connection COIL transceiver circuit 40, the cathode of the detector diode D1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is grounded through the high-frequency filter capacitor C1, the second end of the first resistor R1 is also grounded through the second resistor R2, the second end of the first resistor R1 is also connected to the first end of the coupling capacitor C2, the second end of the coupling capacitor C2 is grounded through the third resistor R3, and the second end of the coupling capacitor C2 is also connected to the decoding I/O port VDM of the microcontroller 10.
The coil transceiver circuit 40 transmits the received data signal modulated and transmitted by the wireless receiving end to the detection decoding circuit 50 for demodulation, and after the detection decoding circuit 50 receives the signal, the detection diode D1 removes the lower half part of the frequency modulation signal transmitted by the coil transceiver circuit 40 and leaves the high-frequency carrier signal enveloping the upper half part of the signal; one end of the high-frequency filter capacitor C1 is connected with the detection diode D1, and the other end is grounded and used for removing high-frequency interference signals in the signals output by the detection diode D1; one end of the first resistor R1 is connected with the detection diode D1, and the other end is connected with the high-frequency filter capacitor C1, so that the negative peak cutting distortion is prevented; one end of the second resistor R2 is connected with the high-frequency filter capacitor C1 and the first resistor R1, and the other end is grounded, so that when the detection diode D1 is conducted, the current flows back to the ground; one end of the coupling capacitor C2 is connected to the second resistor R2, and the other end is connected to the decoding I/O port VDM of the microcontroller 10, so as to isolate the unnecessary dc component in the output signal of the detection decoding circuit 50, and further transmit the effective low frequency signal to the microcontroller 10.
In one embodiment, the current detection circuit 60 is used for detecting the current flowing to the ground from the driving circuit 30 and transmitting the detected current signal to the microcontroller 10, and the microcontroller 10 controls the driving circuit 30 to perform current limiting and short circuit protection according to the current signal.
The current detection circuit 60 is connected to the ground port I-SAM of the driving circuit 30 and the current detection I/O port VSEN of the microcontroller 10, detects a current flowing from the driving circuit 30 to ground, and transmits a detected current signal to the microcontroller 10, and the microcontroller 10 adjusts the PWM signal according to the current signal, thereby controlling the current output of the driving circuit 30 to perform current limiting and short circuit protection.
Referring to fig. 7, in an embodiment, the current detection circuit 60 includes a first capacitor C7, a fourth resistor R4, and a sampling resistor R5, wherein:
the first end of the fourth resistor R4 is connected to the ground port I-SAM of the driving circuit 30, the first end of the fourth resistor R4 is further connected to ground through the sampling resistor R5, the second end of the fourth resistor R4 is connected to the current detection I/O port VSEN of the microcontroller 10, and the second end of the fourth resistor R4 is further connected to ground through the first capacitor C7.
The sampling resistor R5 has one end connected to the port I-SAM to ground of the driver circuit 30 and the other end connected to ground, thereby detecting the current flowing from the driver circuit 30 to ground; the fourth resistor R4 and the first capacitor C7 form an RC filter circuit, which effectively prevents other signals from interfering with the circuit.
In one embodiment, the indication circuit 70 is used to indicate the operating state, power-up state, power-down state, etc. of the wireless transmission circuit.
The indication circuit 70 is connected with the microcontroller 10, and the microcontroller 10 sends a driving signal to the indication circuit 70 according to the working state, the power-on state and the power-off state of the wireless transmission circuit, so as to control the indication circuit 70 to perform signal indication, thereby facilitating the operation of the control circuit.
Referring to fig. 8, in an embodiment, the indicating circuit 70 includes a first LED lamp LED1, a second LED lamp LED2, a first current limiting resistor R6, and a second current limiting resistor R7, wherein:
the positive pole of the first LED lamp LED1 is connected to the current detection I/O port VSEN of the microcontroller 10 through the first current limiting resistor R6, the negative pole of the first LED lamp LED1 is grounded, the positive pole of the second LED lamp LED2 is connected to the driving I/O port LED of the microcontroller 10 through the second current limiting resistor R7, and the negative pole of the second LED lamp LED2 is grounded.
The first LED lamp LED1 and the second LED lamp LED2 may be light emitting diodes with the same color or different colors, the indicating circuit 70 performs different light displays according to the driving signal sent by the microcontroller 10, the indicating circuit 70 may perform signal indication on the working state, power-on state and power-off state of the wireless transmitting circuit through the combination transformation of the color, brightness, and flashing condition of the LED lamps, and the working state may be standby, charging, full charge, and other states such as false alarm.
The current detection circuit 60 and the indication circuit 70 multiplex the same I/O port of the microcontroller 10, that is, the first LED lamp LED1 of the indication circuit 70 and the current detection circuit 60 are both connected to the microcontroller 10 through the current detection I/O port VSEN of the microcontroller 10, and the current detection circuit 60 and the indication circuit 70 are controlled by the driving signal sent by the microcontroller 10 to alternately use the current detection I/O port VSEN, thereby saving one I/O port, enabling the microcontroller 10 to adopt a packaging device with fewer pins, and enabling the occupied space to be small and the cost to be low.
Referring to fig. 9, in an embodiment, the wireless transmitting circuit further includes a temperature detecting circuit 80 connected to the microcontroller 10 for detecting a temperature and transmitting a detected temperature signal to the microcontroller 10, and the microcontroller 10 adjusts an output power of the wireless transmitting circuit according to the temperature signal to perform over-temperature protection.
The temperature detection circuit 80 is connected to the NTC port of the microcontroller 10, detects the temperature of the wireless transmitter circuit, and transmits the detected temperature signal to the microcontroller 10, and the microcontroller 10 adjusts the PWM signal according to the temperature signal, thereby controlling the power output of the driving circuit 30 to realize temperature protection.
Referring to fig. 10, in an embodiment, the temperature detecting circuit 80 includes a thermistor R8, a voltage dividing resistor R9, and a filter capacitor C8, wherein:
the first end of the thermistor R8 is connected to the NTC port of the microcontroller 10, the first end of the thermistor R8 is also connected to the positive output terminal of the power supply circuit 20 via the voltage divider resistor R9, the first end of the thermistor R8 is also grounded via the filter capacitor C8, and the second end of the thermistor R8 is grounded.
The thermistor R8 may be a Negative Temperature Coefficient thermistor (NTC), the resistance of the thermistor R8 is lower as the Temperature of the wireless transmitting circuit is higher, the Temperature detecting circuit 80 detects the Temperature of the wireless transmitting circuit through the thermistor R8, and the microcontroller 10 adjusts the duty ratio of the PWM signal according to the detected Temperature, thereby controlling the power output of the driving circuit 30 to realize Temperature protection.
A second aspect of the present application provides a wireless transmitting apparatus, including the wireless transmitting circuit provided above.
The microcontroller 10 respectively adjusts two complementary PWM signals to be output to the driving circuit 30 according to the current signal detected by the current detection circuit 60 and the temperature signal detected by the temperature detection circuit 80 to control the current output and the power output of the driving circuit 30, and further performs current limiting to realize short-circuit protection and temperature protection, the coil transceiver circuit 40 transmits the power signal and/or the data signal output by the driving circuit 30, receives the data signal modulated and transmitted by the wireless receiving end and transmits the data signal to the detection decoding circuit 50, the detection decoding circuit 50 demodulates the data signal modulated and transmitted by the wireless receiving end and transmits the demodulated signal to the microcontroller 10 to realize the two-way communication between the wireless receiving end and the microcontroller 10, and the microcontroller 10 transmits the driving signal to the indicating circuit 70 according to the working state, the power-on state and the power-off state of the wireless transmitting circuit, and is signaled by the control indication circuit 70 to facilitate the operation of the control circuit.
The wireless transmitting circuit is composed of the power supply circuit 20, the microcontroller 10, the driving circuit 30, the coil transceiving circuit 40, the current detection circuit 60, the indicating circuit 70 and the detection decoding circuit 50, the peripheral circuit is simple, decoding is simplified and reliable, the current detection circuit 60 and the indicating circuit 70 multiplex the same I/O port of the microcontroller 10, one I/O port is saved, the microcontroller 10 can adopt a packaging device with few pins, the peripheral circuit is concise, the occupied space of the circuit is small, and the cost is low.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A wireless transmit circuit, the wireless transmit circuit comprising: the device comprises a power supply circuit, a coil transceiving circuit, a microcontroller, a driving circuit connected with the coil transceiving circuit and the microcontroller, a current detection circuit connected with the driving circuit and the microcontroller, an indicating circuit connected with the microcontroller and a detection decoding circuit connected with the coil transceiving circuit and the microcontroller; the current detection circuit and the indication circuit multiplex the same I/O port of the microcontroller.
2. The wireless transmit circuit of claim 1, wherein the microcontroller is an 8-pin packaged device.
3. The wireless transmission circuit according to claim 1, wherein the detector decoding circuit includes a detector diode, a high-frequency filter capacitor, a coupling capacitor, a first resistor, a second resistor, and a third resistor, wherein:
the positive pole of detection diode connects coil transceiver circuit's coil, detection diode's negative pole connects the first end of first resistance, the second end of first resistance passes through high frequency filter capacitor ground connection, the second end of first resistance still passes through second resistance ground connection, the second end of first resistance still connects coupling capacitor's first end, coupling capacitor's second end passes through third resistance ground connection, coupling capacitor's second end still connects microcontroller's decoding IO mouth.
4. The wireless transmitter circuit of claim 1, wherein the current detection circuit is configured to detect a current flowing from the driver circuit to ground and transmit a detected current signal to the microcontroller, and the microcontroller controls the driver circuit to perform current limiting and short circuit protection according to the current signal.
5. The wireless transmission circuit of claim 4, wherein the current detection circuit comprises a first capacitor, a fourth resistor, and a sampling resistor, wherein:
the first end of the fourth resistor is connected with a port to the ground of the driving circuit, the first end of the fourth resistor is grounded through the sampling resistor, the second end of the fourth resistor is connected with a current detection I/O port of the microcontroller, and the second end of the fourth resistor is grounded through the first capacitor.
6. The wireless transmit circuit of claim 1, wherein the indication circuit is to indicate an operational state, a power-up state, and a power-down state of the wireless transmit circuit.
7. The wireless transmitting circuit of claim 5 or 6 wherein the indicating circuit comprises a first LED light, a second LED light, a first current limiting resistor, a second current limiting resistor, wherein:
the positive pole of the first LED lamp is connected with the current detection I/O port of the microcontroller through the first current limiting resistor, the negative pole of the first LED lamp is grounded, the positive pole of the second LED lamp is connected with the driving I/O port of the microcontroller through the second current limiting resistor, and the negative pole of the second LED lamp is grounded.
8. The wireless transmit circuit of claim 1, further comprising a temperature sensing circuit coupled to the microcontroller for sensing temperature and transmitting a sensed temperature signal to the microcontroller, the microcontroller adjusting the output power of the driver circuit based on the temperature signal.
9. The wireless transmitter circuit of claim 8, wherein the temperature detector circuit comprises a thermistor, a voltage divider resistor, and a filter capacitor, wherein:
the first end of the thermistor is connected with a temperature detection I/O port of the microcontroller, the first end of the thermistor is also connected with an output anode of the power supply circuit through the divider resistor, the first end of the thermistor is also grounded through the filter capacitor, and the second end of the thermistor is grounded.
10. A wireless transmission apparatus, comprising the wireless transmission circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120452430.2U CN214959538U (en) | 2021-03-02 | 2021-03-02 | Wireless transmitting circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120452430.2U CN214959538U (en) | 2021-03-02 | 2021-03-02 | Wireless transmitting circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN214959538U true CN214959538U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120452430.2U Active CN214959538U (en) | 2021-03-02 | 2021-03-02 | Wireless transmitting circuit and device |
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| CN (1) | CN214959538U (en) |
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2021
- 2021-03-02 CN CN202120452430.2U patent/CN214959538U/en active Active
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