CN219535721U - Wireless charging transmitting circuit and device with charging identification - Google Patents

Abstract

The utility model provides a wireless charging transmitting circuit with a charging identifier and a device thereof, and relates to the field of wireless charging. Comprising the following steps: the driving circuit generates a driving signal according to the control signal transmitted by the control circuit to drive the emitting circuit; the transmitting circuit transmits electromagnetic waves outwards; the current detection circuit detects the driving signal to generate a current detection signal; the voltage detection circuit detects the voltage of the transmitting circuit to generate a voltage detection signal. The control circuit also receives and responds to the current sense signal and the voltage sense signal. The transmitting circuit is respectively connected with the driving circuit and the voltage detection circuit, the driving circuit is respectively connected with the current detection circuit and the control circuit, and the voltage detection circuit and the current detection circuit are respectively connected with the control circuit; the control circuit obtains the current signals and the voltage signals of the driving circuit and the transmitting circuit, and obtains the load condition of the transmitting circuit, so that the monitoring of the circuit state can be realized without arranging a special wireless charging transmitting chip and a wireless charging receiving chip.

Description

Wireless charging transmitting circuit and device with charging identification

Technical Field

The utility model relates to the field of wireless charging, in particular to a wireless charging transmitting circuit with a charging identifier and a device.

Background

Wireless charging, also known as inductive charging, non-contact inductive charging, uses a wireless charger to wirelessly transfer energy to powered devices. The wireless charger generally comprises a wireless charging transmitting device and a wireless charging receiving device arranged on the electric equipment. When many wireless chargers are used, in order to be convenient to use, various modes are often adopted to prompt a user of the charging state of the wireless charging transmitting device. In order to better identify the working state of the current wireless charging transmitting device, a plurality of wireless chargers are provided with circuit state monitoring devices on the wireless charging transmitting device and the wireless charging receiving device, so as to monitor the circuit state of the battery of the electric equipment. For example, it is monitored whether the powered device is fully charged, placed on a wireless charging transmitting device. In the prior art, the wireless charging transmitting chip and the wireless charging receiving chip with the handshake communication protocol and the mutual communication function are generally adopted for implementation, namely, the wireless charging transmitting chip and the wireless charging receiving chip are respectively arranged on the wireless charging transmitting device and the electric equipment, and the wireless charging transmitting device monitors the circuit state of the wireless charging transmitting device through data communication between the two chips. However, for inexpensive equipment, production costs are greatly increased.

Disclosure of Invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

According to a first aspect of the present utility model, a wireless charging transmitting circuit with a charging identifier is provided, the circuit comprising: the LED lamp display device comprises a transmitting circuit, a control circuit, a current detection circuit, a driving circuit, a voltage detection circuit and an LED lamp display circuit, wherein the transmitting circuit is respectively connected with the driving circuit and the voltage detection circuit, the driving circuit is respectively connected with the current detection circuit and the control circuit, the voltage detection circuit and the current detection circuit are respectively connected with the control circuit, and the LED lamp display circuit is connected with the control circuit; wherein the control circuit is used for generating a control signal; the driving circuit is used for generating a driving signal according to the control signal transmitted by the control circuit so as to drive the transmitting circuit; the transmitting circuit is used for transmitting electromagnetic waves outwards according to the driving signals; the current detection circuit is used for generating a current detection signal for detecting the driving signal; the voltage detection circuit is used for generating a voltage detection signal for detecting the transmitting circuit; the control circuit is further used for receiving the current detection signal and the voltage detection signal; the LED lamp display circuit is used for displaying a prompt signal representing the circuit state of the wireless charging transmitting circuit with the charging identifier.

According to the wireless charging transmitting circuit, the control circuit obtains the current signals and the voltage signals of the driving circuit and the transmitting circuit, so that the load condition of the transmitting circuit is obtained, and the monitoring of the circuit state can be realized without arranging a special wireless charging transmitting chip and a wireless charging receiving chip. Saving the production cost.

In some embodiments, the driving signal is a pulse signal, and the control circuit is further configured to output a preset pulse width modulation signal to the driving circuit, so that the driving circuit generates the driving signal in response to the preset pulse width modulation signal.

In some embodiments, the circuit state includes a standby state, a charging state, a full state; the prompt signals comprise standby prompt signals, charging prompt signals and full prompt signals.

In some embodiments, the wireless charging transmitting circuit further comprises a calibration switch, the wireless charging transmitting circuit with charging identification further comprises a calibration switch, the calibration switch is connected with the control circuit, and the control circuit is used for executing: receiving a calibration signal sent by the calibration switch, and generating a calibration pulse signal according to the calibration signal; transmitting the calibration pulse signal to the driving circuit, so that the driving circuit generates a preset pulse signal according to the calibration pulse signal; adjusting the preset pulse signal, and receiving a current calibration signal detected by the current detection circuit and a voltage calibration signal detected by the voltage detection circuit; and obtaining a current standard value, a voltage standard value and a preset pulse width modulation signal of the standby state according to the current calibration signal and the voltage calibration signal.

In some embodiments, the control circuit is further configured to obtain a current detection value and a voltage detection value from the current detection signal and the voltage detection signal; the current detection value is a current difference value between the current detection signal and the current standard value, and the voltage detection value represents a voltage difference value between the voltage detection signal and the voltage standard value; when the current detection value is smaller than a first preset value and the voltage detection value is smaller than a second preset value, the circuit state is the standby state; when the current detection value is larger than a third preset value, the circuit state is the charging state; and when the current detection value is smaller than or equal to the third preset value and the voltage detection value is larger than or equal to a fourth preset value, the circuit state is the full state.

In some embodiments, the control circuit comprises a single chip microcomputer, wherein the single chip microcomputer comprises a grounding pin, a power supply pin, a voltage measurement pin, a current measurement pin and a pulse width modulation signal output pin.

In some embodiments the drive circuit includes: the field effect transistor comprises a drain electrode, a grid electrode and a source electrode, and the grid electrode of the field effect transistor is connected with the first resistor and the pulse width modulation signal output pin.

In some embodiments, the transmitting circuit includes a first capacitor and a transmitting coil connected in parallel, a power source is connected to the first capacitor and the transmitting coil, respectively, and the transmitting coil and the first capacitor are connected to the drain of the field effect transistor, respectively.

In some embodiments, the current detection circuit comprises a third resistor, a fourth resistor and a second capacitor, wherein one end of the fourth resistor is connected with the source electrode of the field effect transistor and the third resistor respectively, the other end of the fourth resistor is connected with the second capacitor and the current measurement pin respectively, and the second capacitor and the third resistor are grounded; the voltage detection circuit comprises a fifth resistor and a sixth resistor which are connected in series, the sixth resistor is grounded, one end of the fifth resistor is connected with the transmitting coil, and the other end of the fifth resistor is respectively connected with the voltage measurement pin and one end of the sixth resistor which is not grounded.

According to a second aspect of the present utility model, a wireless charging transmitting device with a charging identifier is provided, which includes any one of the wireless charging transmitting circuits with a charging identifier.

It will be appreciated that the advantages of the second aspect compared with the related art are the same as those of the first aspect compared with the related art, and reference may be made to the related description in the first aspect, which is not repeated here.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

Fig. 1 is a schematic diagram of a wireless charging transmitting circuit with charging identification according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of an electromagnetic wave transmission path according to an embodiment of the present utility model.

Fig. 3 is a circuit diagram of a wireless charging transmitting circuit with charging identification according to an embodiment of the present utility model.

Fig. 4 is a circuit diagram of a control circuit and an LED display circuit of a wireless charging transmitting circuit with a charging identifier according to an embodiment of the present utility model.

Reference numerals: 101: control circuit, 102: drive circuit, 103: transmitting circuit, 104: current detection circuit, 105: voltage detection circuit, 106: LED display circuit, 107: calibration switch, 2: and electric equipment.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced in other embodiments, which depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the embodiments of the present utility model with unnecessary detail.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

And (3) wireless charging: also known as inductive charging, non-contact inductive charging, uses near field induction, i.e., inductive coupling, to transfer energy from a wireless charging transmitting device (charger) to an electrical device. Generally, energy is transmitted in an inductive coupling mode, so that the wireless charging transmitting device and the power utilization device are not connected by wires, and no conductive contact can be exposed, so that the sealing performance is good.

On the one hand, when many wireless chargers are used, in order to be convenient to use, various modes are often adopted to prompt a user of the charging state of the wireless charging transmitting device. In the prior art, the current state of the wireless charging transmitting device is obtained by using a wireless charging transmitting chip and a wireless charging receiving chip with handshake communication protocol and mutual communication functions, for example, when electric equipment (wireless charging receiving device) enters a charging state, the electric equipment transmits a communication signal representing the state of the electric equipment 2 through the wireless charging receiving chip, so that the wireless charging transmitting chip of the wireless charging transmitting device receives the signal and represents the charging state. But the wireless charging transmitting chip and the wireless charging receiving chip having such functions are high in cost.

On the other hand, in many wireless charging transmitting devices, there is an unavoidable parameter error of the wireless charging transmitting circuit itself. Particularly, the transmitting coil in the wireless charging transmitting circuit has the probability of inconsistent parameters due to different manufacturing processes and production batches.

Fig. 1 is a schematic diagram of a wireless charging transmitting circuit with charging identification according to an embodiment of the present utility model.

In order to solve at least one of the above problems, referring to fig. 1, the present utility model proposes a wireless charging transmitting circuit with a charging identifier, including: the LED display device comprises a transmitting circuit 103, a control circuit 101, a current detection circuit 104, a driving circuit 102, an LED display circuit 106 and a voltage detection circuit 105, wherein the transmitting circuit 103 is respectively connected with the driving circuit 102 and the voltage detection circuit 105, the driving circuit 102 is respectively connected with the current detection circuit 104 and the control circuit 101, and the voltage detection circuit 105 and the current detection circuit 104 are respectively connected with the control circuit 101; wherein the control circuit 101 is configured to generate a control signal; a driving circuit 102 for generating a driving signal to drive the transmitting circuit 103 according to the control signal transmitted from the control circuit 101; a transmitting circuit 103 for transmitting electromagnetic waves outwards; a current detection circuit 104 for detecting a driving signal to generate a current detection signal; the voltage detection circuit 105 is configured to detect a voltage of the transmitting circuit 103 to generate a voltage detection signal. A control circuit 101, which is further configured to receive and respond to the current detection signal and the voltage detection signal; the LED display circuit 106 is configured to display a prompt signal indicative of a circuit state of the wireless charging transmitting circuit with a charging identifier.

By enabling the control circuit 101 to obtain the current detection signals and the voltage detection signals of the driving circuit 102 and the transmitting circuit 103, the load condition of the transmitting circuit 103 is obtained, so that the charging state can be monitored without setting a special wireless charging transmitting chip and a wireless charging receiving chip with handshake communication protocols, and the production cost is saved.

Fig. 2 is a schematic diagram of an electromagnetic wave transmission path according to an embodiment of the present utility model.

Specifically, in the embodiment of fig. 2, the control circuit 101 emits a preset PWM (pulse width modulation) modulation signal, so that the driving circuit 102 generates a driving signal capable of driving the transmitting circuit 103 to transmit electromagnetic waves after receiving the signal. In some embodiments, the driving circuit 102 is connected to a power source, so that the driving signal is a main energy source of electromagnetic waves, and in particular, the transmitting circuit 103 may be a device that converts the driving signal with energy sent by the driving circuit 102 into electromagnetic waves. In other embodiments, however, the transmitting circuit 103 is coupled to a power source to generate electromagnetic waves by resonance.

Accordingly, the control circuit 101 can adjust the driving signal by adjusting the PWM modulation signal, thereby controlling the properties of the amplitude, frequency, phase, and the like of the electromagnetic wave emitted from the emission circuit 103. And the electric equipment 2 is provided with a wireless charging receiving device matched with the transmitting circuit 103, which can receive specific or unspecified electromagnetic waves and convert the electromagnetic waves into energy. The specific electromagnetic wave means that the wireless charging receiving device receives electromagnetic waves with specific amplitude, frequency and phase so as to achieve the technical effect that the wireless charging transmitting device and the wireless charging receiving device are matched one by one. But it is obvious that the technical effects of the present utility model can be achieved if the electric device 2 corresponding to the present utility model uses a wireless charging receiving device that does not receive a specific electromagnetic wave. In some embodiments, the transmitting circuit 103 includes an inductor, where the driving circuit 102 may send a pulse signal, and adjust the period and amplitude of the electromagnetic wave sent by the inductor through the period and amplitude of the pulse signal.

Referring to fig. 1, a current detection circuit 104 is connected to a driving circuit 102 for obtaining a current detection signal of the driving circuit 102, the current detection signal characterizes a real-time load current of the driving circuit 102, a voltage detection circuit 105 is connected to a transmitting circuit 103 for detecting a voltage of the transmitting circuit 103 and generating a voltage detection signal, and the detected voltage detection signal and current detection signal are transmitted to the control circuit 101 through connection with the control circuit 101, so that the control circuit 101 can receive the voltage detection signal and the current detection signal and respond accordingly.

Specifically, in some embodiments, the corresponding response may be performed by an LED display circuit 106 as shown in fig. 1. For example, the control circuit 101 determines the circuit state of the wireless charging transmitting circuit with the charging identifier according to the current detection signal and the voltage detection signal in the wireless charging transmitting circuit with the charging identifier, so as to control the LED display circuit 106 to send out a corresponding prompt signal. The prompting signal can be different methods such as flashing lights, normally lighting, turning off lights, emitting lights with different colors, or adjusting the frequency of the flashing lights, and the wireless charging transmitting circuit with the charging identification is prompted to be in different states. The wireless charging transmitting circuit with the charging identifier generally has three circuit states of standby state, charging state and full state, so the prompting signals of the LED display circuit 106 also comprise standby prompting signals, charging prompting signals and full prompting signals. It is obvious that different states can be set according to specific scene requirements. The speed of charging in the state of charge is particularly indicated by adjusting the frequency of the flashing light, for example, and in particular, in embodiments in which the LED display circuit comprises a single LED light, the state of charge is indicated by the LED light flashing light, the full state is indicated by the LED light being normally on, and the standby state is indicated by the LED light being off.

In some embodiments, in order to reduce the error generated by the transmitting circuit 103, the wireless charging circuit of the present utility model further provides a calibration switch 107, where the calibration switch 107 is connected to the control circuit 101, so that the control circuit 101 can receive the calibration signal sent by the calibration switch 107, and perform receiving the calibration signal sent by the calibration switch 107, and generate a calibration pulse signal according to the calibration signal; transmitting the calibration pulse signal to the driving circuit 102 so that the driving circuit 102 generates a predetermined pulse signal from the calibration pulse signal; the calibration pulse signal is adjusted, and a current standard value, a voltage standard value and a preset pulse width modulation signal are obtained according to the received current calibration signal of the current detection circuit 104 and the received voltage calibration signal of the voltage detection circuit 105.

Specifically, it is possible to cause the control circuit 101 to transmit a PWM modulation signal of a predetermined magnitude to the drive circuit 102 and gradually increase the frequency of the PWM modulation signal at a fixed speed. At this time, the driving signal emitted from the driving circuit 102 is also changed correspondingly, so that the voltage of the emitting circuit 103 is gradually increased and is acquired by the voltage detecting circuit 105. When the voltage detection signal reaches a preset value, the frequency of the PWM modulation signal and the current detection signal value are obtained. This preset value is used to indicate that the wireless charging transmitter circuit with the charging identifier is not effectively connected to the consumer 2. And the PWM modulation signal at the moment is set to be a preset pulse width modulation signal of the wireless charging transmitting circuit with the charging mark, a current detection value is used as a standard current value, and a voltage detection value is used as a standard voltage value. Therefore, the utility model can carry out corresponding independent calibration on different wireless charging transmitting circuits with charging marks, thereby reducing errors in current detection and voltage detection. The error in judging the circuit state as described below can be reduced. It should be noted that the standard current value and the standard voltage value characterize a situation in which the electric consumer 2 is not placed in the wireless charging transmitting device, that is, a situation in which the circuit state is in the standby state.

In some embodiments, when the circuit state of the wireless charging transmitting circuit with the charging identifier is a standby state, the current detection value is smaller than a first preset value, and the voltage detection value is smaller than a second preset value; when the circuit state is a charging state, the current detection value is larger than a third preset value; when the circuit state is a full state, the current detection value is smaller than or equal to a third preset value, and the voltage detection value is larger than or equal to a fourth preset value.

The utility model obtains the circuit state of the wireless charging transmitting circuit with the charging identifier through the change of the current detection signal detected by the transmitting circuit 103 before and after charging. On the one hand, after entering the charging state, the current detection signal will be significantly larger than the standard current value, on the other hand, since the transmitting circuit 103 is an LC resonant circuit, at this time, the impedance of the LC resonant circuit is reduced due to the coupling effect, so that the voltage detection signal will be reduced after the battery of the electric device 2 is fully charged.

Based on the above principle, the control circuit 101 obtains a current detection value and a voltage detection value from the current detection signal and the voltage detection signal; the current detection value represents the difference between the current detection signal and the current standard value, and the voltage detection value represents the difference between the voltage detection signal and the voltage standard value. When the current detection value is smaller than 10% of the current standard value and the voltage detection value is smaller than 10% of the voltage standard value, it can be judged that the electric equipment 2 is not placed on the charger, and the wireless charging transmitting circuit with the charging identifier is in a standby state. When the current detection value is greater than 20% of the circuit standard value, it can be judged that the current is increased because the electric equipment 2 is being charged, and the wireless charging transmitting circuit with the charging identifier is in a charging state. When the voltage detection value is greater than or equal to 15% of the voltage standard value, but the current detection value is less than or equal to 20% of the current standard value, the battery of the electric equipment 2 can be considered to be full, but still placed on the charger, so that the wireless charging transmitting circuit with the charging identifier has smaller energy output, and the wireless charging transmitting circuit is in a full state.

Based on the above manner, the present utility model realizes the state identification of the wireless charging transmitting circuit at a lower cost, and by providing the calibration switch 107, the different transmitting circuits 103 are calibrated, so that the above state identification result can become more accurate.

Although in the above embodiment, the use of the LED display circuit 106 for prompting is mentioned, a similar effect can be achieved by using a display screen or sending information to an external device for prompting, and thus the present utility model may not impose any limitation on the prompting method.

Example 1

Fig. 3 is a circuit diagram of a wireless charging transmitting circuit with charging identification according to an embodiment of the present utility model. Fig. 4 is a circuit diagram of a control circuit and an LED display circuit of an embodiment of the present utility model.

In embodiment 1, the driving circuit includes a field effect transistor Q1 and a first resistor R1, where the field effect transistor Q1 is an N-channel MOS transistor, and in some embodiments, an N-channel MOS transistor with a withstand voltage not lower than 40V and a withstand current above 3A is used. The grid electrode of the field effect tube Q1 is connected with the first resistor R1 and the control circuit, the drain electrode of the field effect tube Q1 is connected with the transmitting coil, and the source electrode of the field effect tube Q1 is connected with the current detection circuit.

The transmitting circuit comprises a first capacitor C1 and a transmitting coil L1 which are connected in parallel, a power supply is respectively connected with the first capacitor C1 and the transmitting coil L1, and the voltage detection circuit is connected with the transmitting coil L1. Electromagnetic waves are generated by a resonance circuit formed by the field effect transistor Q1, the first capacitor C1 and the transmitting coil L1 (inductor) according to a driving signal sent by the driving circuit.

The current detection circuit comprises a third resistor R3, a fourth resistor R4 and a second capacitor C2, wherein the third resistor R3 is connected with the fourth resistor R4 in parallel, the fourth resistor R4 is connected with the second capacitor C2 in series, and the control circuit is connected with the fourth resistor. The third resistor R3 connected to the source of the field effect transistor Q1 is used as a sampling resistor, and the current detection signal of the driving circuit is obtained and is transmitted to the control circuit 101 after being filtered by the grounded second capacitor C2.

The voltage detection circuit includes a fifth resistor R5 and a sixth resistor R6 connected in series, the fifth resistor R5 is connected to the drain of the field effect transistor Q1 and the transmitting coil L1, respectively, and the sixth resistor R6 is grounded, so that the voltage load of the transmitting coil L1 can be measured by testing the voltage dividing resistance of the sixth resistor R6, and is transmitted into the control circuit 101.

Referring to fig. 4, the control circuit 101 includes a single chip microcomputer U1, which includes at least 8 pins, a VCC pin for accessing a power supply, a GND pin for grounding, an ad_c pin for acquiring a current detection signal, an ad_v pin for acquiring a voltage detection signal, an LED pin for controlling an LED display circuit, a PWM pin for transmitting a control signal, a TEST pin for connecting a calibration switch, and an empty pin. A third capacitor C3 for filtering is connected between the VCC pin and the GND pin.

The LED display circuit comprises a seventh resistor R7 and an LED lamp LED1 which are connected in series, wherein the seventh resistor R7 is connected with an LED pin of the singlechip U1, and the LED lamp LED1 is grounded.

In the embodiment 1, a waveform with a fixed frequency (usually 120 KHz-150 KHz, calibration is completed through a calibration switch) and a duty ratio of 50% is output by using a PWM pin to drive an LC resonant circuit composed of a field effect transistor Q1, a transmitting coil L1 and a resonant capacitor C1 to work, so that a dc input is converted into electromagnetic waves with higher voltage to be transmitted to charge electric equipment. The voltage detection signal of the transmitting coil L1 is detected by a fifth resistor R5 and a sixth resistor R6 which are connected in series, the current detection signal before input is detected by a third resistor R3, and the signals are received by a singlechip U1, so that the LED lamp LED1 displays the corresponding state of a wireless charging transmitting circuit with a charging identifier. In addition, when the wireless charging transmitting circuit with the charging identifier is in a standby state, the working mode can be set to a power saving mode after a certain period of time (for example, the transmitting interval is changed to 2 seconds, the detecting interval is set to 100ms, and the turn-off ratio is 20:1).

The calibration switch is realized through the TEST foot of singlechip U1, and when the TEST foot was low level, the entering calibration mode, singlechip U1's PWM mouth output waveform duty cycle was fixed to 50% this moment, begins with 120KHz, and the frequency of about 10KHz as the frequency of interval increase PWM signal gradually is up to 150KHz and is swept. At this time, the voltage value to ground of the transmitting coil L1 increases, so that the voltage across the sixth resistor R6 increases. When the voltage detection signal received by the AD_V pin of the singlechip reaches a preset value, the current PWM signal is obtained as a preset pulse width modulation signal, the current detection signal (AD_C pin) is taken as a current standard value, the current voltage detection signal (AD_V pin) is taken as a voltage standard value, and the current PWM signal and the current voltage detection signal (AD_C pin) are stored in an internal readable and writable storage space of the singlechip U1. Thereby, the influence of the transmitting coil L1 and the first capacitor C1 on the voltage detection value when transmitting the electromagnetic wave due to the parameter error thereof is calibrated.

In embodiment 1, the power supply VCC adopts a power adapter with direct current of 5V + -5% and output current not less than 0.5A, and the singlechip U1 can specifically adopt a built-in EEPROM, at least 1 PWM port, two 12-bit resolution AD ports, and a model of cheap CPU such as FT61F131B-RB packaged by the highest working voltage of 5.5V, SOP-8. In order to ensure accurate voltage division, the fifth resistor R5 can be a 0805 chip resistor with the accuracy of 30-100 KΩ and the accuracy of + -1%, and the sixth resistor R6 can be a 0805 chip resistor with the accuracy of 10-30 KΩ and the accuracy of + -1%. According to the specific condition of the circuit, the ratio of the fifth resistor R5 to the sixth resistor R6 is set between 3:1 and 4:1, so that the maximum partial voltage at the two ends of the sixth resistor R6 is not more than 80% of the power supply voltage VCC of the singlechip U1, and the AD sampling value (voltage detection value) of the singlechip U1 is prevented from overflowing. The LED lamp LED1 may be any of various colors and types of LED lamps, and is not limited in this regard. The seventh resistor R7 should make a resistor that works well for the LED lamp LED1 according to the kind and model of the LED lamp. The respective capacitances of the present utility model are not particularly limited as well, and are determined according to the used scenario. The NPO patch capacitor with small loss, good thermal stability and withstand voltage of 50V can be used as the first capacitor C1. The first capacitance C1 may be used 22nf±5% when the transmission coil L1 is 11 μh. In other embodiments, since the standby power consumption is required to be less than 0.3W, in order to meet the requirement of intermittent operation in the standby state, the third capacitor C3 needs to select an electrolytic capacitor with a capacitance not less than 100uF and a withstand voltage of 16V, so as to reduce the fluctuation of the supply current, and make the supply current smoother, so as to facilitate the measurement of the standby current of the wireless charging transmitting device.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (8)

1. A wireless charging transmitting circuit with charging identification, the circuit comprising: the LED display device comprises a transmitting circuit, a control circuit, a current detection circuit, a driving circuit, a voltage detection circuit and an LED display circuit, wherein the transmitting circuit is respectively connected with the driving circuit and the voltage detection circuit, the driving circuit is respectively connected with the current detection circuit and the control circuit, the voltage detection circuit and the current detection circuit are respectively connected with the control circuit, and the LED display circuit is connected with the control circuit; wherein,,

the control circuit is used for generating a control signal;

the driving circuit is used for generating a driving signal according to the control signal transmitted by the control circuit so as to drive the transmitting circuit;

the transmitting circuit is used for transmitting electromagnetic waves outwards according to the driving signals;

the current detection circuit is used for generating a current detection signal for detecting the driving signal;

the voltage detection circuit is used for generating a voltage detection signal for detecting the transmitting circuit;

the LED display circuit is used for displaying a prompt signal representing the circuit state of the wireless charging transmitting circuit with the charging identifier;

the control circuit is also used for receiving the current detection signal and the voltage detection signal.

2. The wireless charging transmitter circuit with charging identification of claim 1, wherein the drive signal is a pulse signal, and the control circuit is further configured to output a preset pulse width modulation signal to the drive circuit, so that the drive circuit generates the drive signal in response to the preset pulse width modulation signal.

3. The wireless charging transmission circuit with charging identification of claim 2, wherein the circuit states include a standby state, a charging state, a full state; the prompt signals comprise standby prompt signals, charging prompt signals and full prompt signals.

4. A wireless charging transmitting circuit with a charging identifier according to any one of claims 1 to 3, wherein the control circuit comprises a single chip microcomputer, and the single chip microcomputer comprises a grounding pin, a power supply pin, a voltage measurement pin, a current measurement pin and a pulse width modulation signal output pin.

5. The wireless charging transmitter circuit with charging identification of claim 4, wherein the driver circuit comprises: the field effect transistor comprises a drain electrode, a grid electrode and a source electrode, and the grid electrode of the field effect transistor is connected with the first resistor and the pulse width modulation signal output pin.

6. The wireless charging transmitting circuit with charging identification of claim 5, wherein the transmitting circuit comprises a first capacitor and a transmitting coil connected in parallel, a power supply is respectively connected with the first capacitor and the transmitting coil, and the transmitting coil and the first capacitor are respectively connected with the drain electrode of the field effect transistor.

7. The wireless charging transmitting circuit with the charging identifier according to claim 6, wherein the current detection circuit comprises a third resistor, a fourth resistor and a second capacitor, one end of the fourth resistor is connected with the source electrode of the field effect transistor and the third resistor respectively, the other end of the fourth resistor is connected with the second capacitor and the current measurement pin respectively, and the second capacitor and the third resistor are grounded;

the voltage detection circuit comprises a fifth resistor and a sixth resistor which are connected in series, the sixth resistor is grounded, one end of the fifth resistor is connected with the transmitting coil, and the other end of the fifth resistor is respectively connected with the voltage measurement pin and one end of the sixth resistor which is not grounded.

8. A wireless charging transmitting device with a charging identifier, characterized by comprising the wireless charging transmitting circuit with a charging identifier as claimed in any one of claims 1 to 7.