Charging sampling control circuit specially designed for wireless charging device

Abstract

The utility model provides a charging sampling control circuit specially designed for a wireless charging device, which can carry out voltage and current self-adaptive adjustment according to battery voltage and current requirements of charging equipment, can avoid overcharging, and is good in safety; comprising a rectification conversion module which is connected with an AC input voltage and is used for carrying out rectification filtering and converting the received AC input voltage into a DC; the output module is connected with a load and used for outputting voltage and current; and the control module is connected with the rectification conversion module and the output module and is used for carrying out charging sampling so as to carry out rectification filtering and control output voltage and current.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging, in particular to a charging sampling control circuit designed for a wireless charging device. Background Art

[0002] Wireless Power Transfer (WPT) refers to a method of transmitting electrical energy from a power source to a load without direct electrical contact. Wireless power transmission has always been a dream of mankind. Through wireless power transmission, electrical devices can be freed from the constraints of cables, avoiding arcing and wear caused by the plugging and unplugging of metal contacts. It has unique advantages in many important applications such as industrial automation production lines, underwater and mining equipment, electric vehicles, implantable medical devices, household appliances and consumer electronics. Wireless power transmission technology has been developed for more than a hundred years. In recent years, with the continuous improvement of power electronics control technology and the performance of semiconductor power devices and magnetic components, wireless power transmission has been applied to the field of wireless charging, and its power and efficiency are close to those of traditional wired charging methods.

[0003] However, existing wireless charging devices still have the following problems: 1. The current and voltage output by the wireless charging device need to be consistent with the voltage required by the charging device to ensure the safety and efficiency of the charging process. However, existing wireless charging devices cannot adaptively adjust the voltage and current, and cannot charge wireless charging devices with multiple battery cells and different voltage levels, and their application range is relatively narrow; 2. After the charging device is charged, it cannot stop charging, which will cause safety problems such as overcharging and explosion of the device. Summary of the Invention

[0004] To address the above problems, the present invention provides a charging sampling control circuit designed specifically for a wireless charging device. The circuit can adaptively adjust the voltage and current according to the battery voltage and current requirements of the charging device, avoid overcharging, and provide good safety.

[0005] The present invention adopts the following technical solution, a charging sampling control circuit designed specifically for a wireless charging device, comprising:

[0006] The rectifier and converter module is connected to the AC input voltage and is used to perform rectification and filtering to convert the received AC input voltage into DC power;

[0007] Output module, connected to the load, used to output voltage and current;

[0008] The control module is connected to the rectification and conversion module and the output module, and is used for performing charging sampling to perform rectification and filtering and control output voltage and current.

[0009] Furthermore, the rectification and conversion module includes MOS tubes Q1~Q8, diodes D1~D6, resistors R1~R8, and a coil K; one end of the coil K is connected to the positive electrode of the diode D1, the drain of the MOS tube Q1, one end of the resistors R2, R3, and R6, and the negative electrodes of the diodes D3 and D6; the other end of the coil K is connected to the positive electrode of the diode D2, the drain of the MOS tube Q2, one end of the resistors R1, R4, and R5, and the negative electrodes of the diodes D4 and D5; the sources of the MOS tubes Q1 and Q2 are grounded; the other end of the resistor R2 is connected to the drain of the MOS tube Q4; the other end of the resistor R1 is connected to the drain of the MOS tube Q3; the sources of the MOS tubes Q3 and Q4 are grounded; The gate of MOS transistor Q6 is connected to the other end of the resistor R3 and the anode of diode D3. The drain of MOS transistor Q6 is connected to the other end of the resistor R4, the anode of diode D4, the drain of MOS transistor Q8, and the gate of MOS transistor Q1. The sources of MOS transistors Q6 and Q8 are connected and then grounded. The gate of MOS transistor Q5 is connected to the other end of the resistor R5 and the anode of diode D5. The drain of MOS transistor Q5 is connected to the other end of the resistor R6, the anode of diode D6, the drain of MOS transistor Q7, one end of resistor R7, and the gate of MOS transistor Q2. The other end of resistor R7 is connected to one end of resistor R8. The sources of MOS transistors Q5 and Q7 are connected to the other end of resistor R8 and then grounded.

[0010] Furthermore, the control module includes a controller U1, a diode D7, and a capacitor C1. The controller U1 uses a model FDT-B3 chip; the positive electrode of the diode D7 is connected to the other end of the coil, the 15th and 16th pins of the controller U1 are connected to the negative electrode of the diode D7 and one end of the capacitor C1, the other end of the capacitor C1 is grounded, the 13th and 14th pins of the controller U1 are connected and then grounded, the 4th pin of the controller U1 is connected to the gate of the MOS tube Q3, the 11th pin of the controller U1 is connected to the gate of the MOS tube Q4, the 7th pin of the controller U1 is connected to the gate of the MOS tube Q8, the 9th pin of the controller U1 is connected to the gate of the MOS tube Q7, and the 8th pin of the controller U1 is connected to one end of the resistor R7;

[0011] Furthermore, the output module includes a DCDC power manager U2, a capacitor C2, a capacitor C3, and resistors R9 and R10. The DCDC power manager U2 adopts a CS5517T DCDC buck-boost manager. The input terminal Vin of the DCDC power manager U2 is connected to the cathodes of the diodes D1 and D2, one end of the resistor R9, and one end of the capacitors C2 and C3. The other end of the resistor R9 is connected to one end of the resistor R10. The other end of the resistor R10 is grounded. The other ends of the capacitors C2 and C3 are connected and then grounded. The enable terminal EN of the DCDC power manager U2 is connected to pin 1 of the controller U1. The output terminal Vout of the DCDC power manager U2 is connected to the load.

[0012] Furthermore, the charging sampling control circuit also includes a voltage stabilizing module, which is connected to the control module for achieving voltage stabilization. The voltage stabilizing module includes a voltage stabilizer U3, a diode D8, an inductor L1, capacitors C4~C9, and resistors R11 and R12. The voltage stabilizer U3 adopts the model MCP16331T-E / CH chip. Pin 1 of the voltage stabilizer U3 is connected to one end of the capacitor C4 and the negative electrode of the diode D8. Pin 3 of the voltage stabilizer U3 is connected to one end of the capacitor C5 and one end of the resistors R11 and R12. Pin 2 of the voltage regulator U3 is grounded, pin 6 of the voltage regulator U3 is connected to the other end of the capacitor C4 and one end of the inductor L1, the other end of the inductor L1 is connected to the positive electrode of the diode D8, the other end of the resistor R11, the other end of the capacitor C5, and one end of the capacitors C6 and C7, and then connected to pin 15 of the controller U1, pin 5 of the voltage regulator U3 is connected to one end of the capacitors C8 and C9, the other ends of the capacitors C8 and C9 are connected to the other end of the resistor R12 and the other ends of the capacitors C6 and C7, and then grounded.

[0013] The beneficial effect of the present invention is that the AC input voltage is converted into DC power through the rectification and conversion module. At the same time, the control module can control the output module to output the corresponding voltage and current to the load after charging sampling, thereby meeting the charging demand and effectively preventing the risk of power overload. It has good safety and good economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 It is a circuit principle diagram of the utility model. DETAILED DESCRIPTION

[0016] like Figure 1 、 Figure 2The utility model discloses a charging sampling control circuit specially designed for wireless charging device, including:

[0017] Rectifier conversion module is connected with AC input voltage, is used for rectifier filter, and AC input voltage received is converted into direct current;

[0018] Output module is connected with load, is used for output voltage current;

[0019] Control module is connected with rectifier conversion module, output module all, is used for charging sampling, carries out rectifier filter and controls output voltage current.

[0020] Rectifier conversion module includes MOS tube Q1~Q8, diode D1~D6, resistance R1~R8, coil K;One end of coil K is connected with the anode of diode D1, the drain of MOS tube Q1, the one end of resistance R2, R3, R6, the cathode of diode D3, D6 all are connected, the other end of coil K is connected with the anode of diode D2, the drain of MOS tube Q2, the one end of resistance R1, R4, R5, the cathode of diode D4, D5 all are connected, the source of MOS tube Q1, Q2 all are grounded, the other end of resistance R2 is connected with the drain of MOS tube Q4, the other end of resistance R1 is connected with the drain of MOS tube Q3, the source of MOS tube Q3, Q4 all are grounded, the gate of MOS tube Q6 is connected with the other end of resistance R3, the anode of diode D3 all, the drain of MOS tube Q6 is connected with the other end of resistance R4, the anode of diode D4, the drain of MOS tube Q8, the gate of MOS tube Q1 all, the source of MOS tube Q6, Q8 is connected after grounding;The gate of MOS tube Q5 is connected with the other end of resistance R5, the anode of diode D5 all, the drain of MOS tube Q5 is connected with the other end of resistance R6, the anode of diode D6, the drain of MOS tube Q7, the one end of resistance R7, the gate of MOS tube Q2 all, the other end of resistance R7 is connected with the one end of resistance R8, the source of MOS tube Q5, Q7 is connected after grounding with the other end of resistance R8.

[0021] Control module includes controller U1, diode D7, capacitor C1, and controller U1 adopts model FDT-B3 chip, also can adopt other existing control device, such as single-chip microcomputer;The anode of diode D7 is connected with the other end of coil, and the 15, 16 pins of controller U1 are connected with the cathode of diode D7, one end of capacitor C1 all, and the other end of capacitor C1 is grounded, and the 13, 14 pins of controller U1 are connected after grounding, and the 4 pin of controller U1 is connected with the gate of MOS tube Q3, and the 11 pin of controller U1 is connected with the gate of MOS tube Q4, and the 7 pin of controller U1 is connected with the gate of MOS tube Q8, and the 9 pin of controller U1 is connected with the gate of MOS tube Q7, and the 8 pin of controller U1 is connected with the one end of resistance R7;

[0022] The output module comprises a DCDC power manager U2, capacitors C2 and C3, resistors R9 and R10, and the DCDC power manager U2 is a DCDC step-up and step-down manager with a model number of CS5517T; the input end Vin of the DCDC power manager U2 is connected with the negative poles of diodes D1 and D2, one end of the resistor R9, and one ends of the capacitors C2 and C3, the other end of the resistor R9 is connected with one end of the resistor R10, the other end of the resistor R10 is grounded, the other ends of the capacitors C2 and C3 are connected and then grounded, the enable end EN of the DCDC power manager U2 is connected with the 1th pin of the controller U1, and the output end Vout of the DCDC power manager U2 is connected with a load.

[0023] The charging sampling control circuit further comprises a voltage stabilizing module connected with the control module and used for realizing voltage stabilization, and the voltage stabilizing module comprises a voltage stabilizer U3, a diode D8, an inductor L1, capacitors C4 to C9, and resistors R11 and R12; the voltage stabilizer U3 adopts a chip with a model number of MCP16331T-E / CH, the 1st pin of the voltage stabilizer U3 is connected with one end of the capacitor C4 and the negative pole of the diode D8, the 3rd pin of the voltage stabilizer U3 is connected with one end of the capacitor C5 and one end of the resistors R11 and R12, the 2nd pin of the voltage stabilizer U3 is grounded, the 6th pin of the voltage stabilizer U3 is connected with the other end of the capacitor C4 and one end of the inductor L1, the other end of the inductor L1 is connected with the positive pole of the diode D8, the other end of the resistor R11, the other end of the capacitor C5, and one ends of the capacitors C6 and C7, and then connected with the 15th pin of the controller U1, the 5th pin of the voltage stabilizer U3 is connected with one ends of the capacitors C8 and C9, the other ends of the capacitors C8 and C9 are connected with the other end of the resistor R12 and the other ends of the capacitors C6 and C7, and then grounded.

[0024] The utility model has high adaptability and flexibility, can be widely used for various different types of load demand, can accurately identify the voltage value required by each load, the multiple detection points arranged on the controller U1 can effectively prevent the risk of power overload, ensure the safety and stability in the current transmission process, can automatically adjust and optimize the output voltage and current according to the detected load demand, and supply power to the load in the best matching state, this characteristic makes the wireless charging device be able to easily cope with and meet various charging scenes within 200 watts, whether it is the rapid charging of small electronic equipment or the stable power supply of medium-sized equipment, it can be handled with ease.

[0025] The utility model discloses a coil K receives electric energy, and the received electric energy is converted into direct current voltage through high frequency rectification, capacitor filter, and the direct current voltage is converted voltage current through DCDC power manager U2, and is charged sample through controller U1, and the control output voltage current, and the control output voltage after the load charging is completed, prevents power overload, specifically, the 6 foot detection primary stage's voltage signal of controller U1, and the 4, 11 foot output signal of controller U1 is coupled through MOS tube Q3, Q4 signal and the resonance wave of coil receiving end, increases or reduces the reception of electric energy, avoids the overcharge of voltage too small and cannot charge and the overcharge of charging voltage after charging is completed causes and charges etc. Hidden danger of security, and the 8 foot of controller U1 detects the hour signal in the resonance wave, and the 7, 9 foot output control drive MOS tube Q8, Q7 of controller U1 carries out rectifier filter, and the received alternating current is converted into direct current, and simultaneously when controller U1 detects that the current output is higher than the voltage required by charging load, and the DCDC power manager U2 is carried out step-down through the pin P01 output signal, to satisfy the charging demand, so as to the battery voltage and current demand of the equipment that is charged can be automatically adjusted the output voltage and current of transmitting end.

[0026] It is obvious for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point, the embodiment should be regarded as exemplary and non-restrictive, and the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the utility model. Any figure mark in the claims should not be regarded as limiting the involved claims.

[0027] In addition, it should be understood that, although the present specification is described according to the embodiment, not every embodiment contains only one independent technical scheme, and the description mode of the specification is only for the sake of clarity, and the skilled person should regard the specification as a whole, and the technical scheme in each embodiment can also be combined to form other embodiments that the skilled person can understand.

Claims

1. A charging sampling control circuit designed specifically for a wireless charging device, characterized by: include: The rectifier and converter module is connected to the AC input voltage and is used to perform rectification and filtering to convert the received AC input voltage into DC power; Output module, connected to the load, used to output voltage and current; The control module is connected to the rectification and conversion module and the output module, and is used for performing charging sampling to perform rectification and filtering and control output voltage and current.

2. The charging sampling control circuit designed for a wireless charging device according to claim 1, characterized in that: The rectifier conversion module includes MOS tubes Q1-Q8, diodes D1-D6, resistors R1-R8, and a coil K; one end of the coil K is connected to the positive electrode of the diode D1, the drain of the MOS tube Q1, one end of the resistors R2, R3, and R6, and the negative electrodes of the diodes D3 and D6; the other end of the coil K is connected to the positive electrode of the diode D2, the drain of the MOS tube Q2, one end of the resistors R1, R4, and R5, and the negative electrodes of the diodes D4 and D5; the sources of the MOS tubes Q1 and Q2 are grounded; the other end of the resistor R2 is connected to the drain of the MOS tube Q4; the other end of the resistor R1 is connected to the drain of the MOS tube Q3; the sources of the MOS tubes Q3 and Q4 are grounded; the source of the MOS tubes Q6 is grounded. The gate is connected to the other end of the resistor R3 and the anode of the diode D3. The drain of the MOS transistor Q6 is connected to the other end of the resistor R4, the anode of the diode D4, the drain of the MOS transistor Q8, and the gate of the MOS transistor Q1. The sources of the MOS transistors Q6 and Q8 are connected and then grounded. The gate of the MOS transistor Q5 is connected to the other end of the resistor R5 and the anode of the diode D5. The drain of the MOS transistor Q5 is connected to the other end of the resistor R6, the anode of the diode D6, the drain of the MOS transistor Q7, one end of the resistor R7, and the gate of the MOS transistor Q2. The other end of the resistor R7 is connected to one end of the resistor R8. The sources of the MOS transistors Q5 and Q7 are connected to the other end of the resistor R8 and then grounded.

3. The charging sampling control circuit designed for a wireless charging device according to claim 2, characterized in that: The control module includes a controller U1, a diode D7, and a capacitor C1. The controller U1 uses a model FDT-B3 chip; the anode of the diode D7 is connected to the other end of the coil, the 15th and 16th pins of the controller U1 are connected to the cathode of the diode D7 and one end of the capacitor C1, the other end of the capacitor C1 is grounded, the 13th and 14th pins of the controller U1 are connected and then grounded, the 4th pin of the controller U1 is connected to the gate of the MOS tube Q3, the 11th pin of the controller U1 is connected to the gate of the MOS tube Q4, the 7th pin of the controller U1 is connected to the gate of the MOS tube Q8, the 9th pin of the controller U1 is connected to the gate of the MOS tube Q7, and the 8th pin of the controller U1 is connected to one end of the resistor R7.

4. The charging sampling control circuit designed for a wireless charging device according to claim 3, characterized in that: The output module includes a DCDC power manager U2, a capacitor C2, a capacitor C3, and resistors R9 and R10. The DCDC power manager U2 adopts a CS5517T DCDC buck-boost manager. The input terminal Vin of the DCDC power manager U2 is connected to the cathodes of the diodes D1 and D2, one end of the resistor R9, and one end of the capacitors C2 and C3. The other end of the resistor R9 is connected to one end of the resistor R10, and the other end of the resistor R10 is grounded. The other ends of the capacitors C2 and C3 are connected and then grounded. The enable terminal EN of the DCDC power manager U2 is connected to pin 1 of the controller U1. The output terminal Vout of the DCDC power manager U2 is connected to the load.

5. The charging sampling control circuit designed for a wireless charging device according to claim 3, characterized in that: The charging sampling control circuit also includes a voltage stabilizing module, which is connected to the control module for achieving voltage stabilization. The voltage stabilizing module includes a voltage stabilizer U3, a diode D8, an inductor L1, capacitors C4~C9, and resistors R11 and R12. The voltage stabilizer U3 adopts the chip model MCP16331T-E / CH. Pin 1 of the voltage stabilizer U3 is connected to one end of the capacitor C4 and the negative electrode of the diode D8. Pin 3 of the voltage stabilizer U3 is connected to one end of the capacitor C5 and one end of the resistors R11 and R12. Pin 2 of U3 is grounded, pin 6 of the voltage regulator U3 is connected to the other end of the capacitor C4 and one end of the inductor L1, the other end of the inductor L1 is connected to the positive electrode of the diode D8, the other end of the resistor R11, the other end of the capacitor C5, and one end of the capacitors C6 and C7, and then connected to pin 15 of the controller U1, pin 5 of the voltage regulator U3 is connected to one end of the capacitors C8 and C9, the other ends of the capacitors C8 and C9 are connected to the other end of the resistor R12 and the other ends of the capacitors C6 and C7, and then grounded.

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