CN113518278A - True wireless Bluetooth headset charging system with high charging conversion efficiency - Google Patents
True wireless Bluetooth headset charging system with high charging conversion efficiency Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1025—Accumulators or arrangements for charging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
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Abstract
The invention relates to a true wireless Bluetooth headset charging system with high charging conversion efficiency, which comprises a Bluetooth headset charging box circuit and a Bluetooth headset circuit, wherein the Bluetooth headset charging box circuit comprises a first battery, a DC/DC conversion circuit, a first port, a second port, a first communication circuit and a charging box master control circuit; the first communication circuit is connected with the first port, the Bluetooth headset circuit comprises a second battery, a second communication circuit, a Bluetooth headset main control circuit, a third port and a fourth port, the second communication circuit is connected with the third port, and the charging box main control circuit is connected with the Bluetooth headset main control circuit through the first communication circuit and the second communication circuit; traditional step-down circuit in its cancellation bluetooth earphone end reduces the electric energy loss, improves the bluetooth earphone then and charges the box and to bluetooth earphone's conversion efficiency that charges, also realizes the single line both way communication between box master control circuit and the bluetooth earphone master control circuit that charges, need not extra communication line, reduces circuit design cost, has better economic benefits.
Description
Technical Field
The invention relates to the technical field of a real wireless Bluetooth headset charging system, in particular to a real wireless Bluetooth headset charging system with high charging conversion efficiency.
Background
In recent years, TWS bluetooth headsets have become more and more popular, consisting of two headsets plus a charging box. In order to consider portability, the overall product appearance is made smaller and smaller, the endurance requirement is longer and longer, and even some TWS Bluetooth earphones take the endurance as a selling point so as to obtain better market acceptance and acceptance.
The existing Bluetooth headset and the charging box are communicated in a one-way mode generally. In addition, in the current bluetooth headsets, 3.7 volts in a charging box are firstly boosted to 5 volts by using DC/DC, and then the voltage is sent to the headset, and the 5 volts is converted into the voltage (usually 3.0 volts to 4.2 volts) required by a battery at the headset end through a voltage reduction circuit to be charged into the battery of the headset. In the process, the DC/DC is in a switch mode, the efficiency can be generally more than 95%, due to the problem that the earphone and the charging box are in switch synchronization (the switches are asynchronous, electric energy cannot be normally transmitted), a charging circuit in the earphone is in a linear working mode, and the average efficiency is about 65%. During this voltage ramp-up-ramp-down transition, more than 35% of the total power is lost.
However, the electric energy stored in the charging box battery is limited, and the energy above 1/3 is lost in practical use, and the requirement of energy saving is not met. In addition, the endurance time is longer in a limited space, and the improvement of the charging conversion efficiency of the charging box to the earphone is the first problem to be solved. There is a need for a new solution to this pain point.
Therefore, in the present patent application, the applicant elaborately researched a true wireless bluetooth headset charging system with high charging conversion efficiency to solve the above problems.
Disclosure of Invention
The invention aims at the defects of the prior art, and mainly aims to provide a true wireless Bluetooth headset charging system with high charging conversion efficiency, a traditional voltage reduction circuit in a Bluetooth headset end is omitted, electric energy loss is reduced, the charging conversion efficiency of a Bluetooth headset charging box on a Bluetooth headset is improved, single-wire bidirectional communication between a charging box main control circuit and a Bluetooth headset main control circuit is realized, an additional communication circuit is not needed, the circuit design cost is reduced, and better economic benefit is achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a high conversion efficiency's that charges true wireless bluetooth headset charging system, is including bluetooth headset charging box circuit and bluetooth headset circuit, wherein:
the first battery is a rechargeable battery, and the Bluetooth headset charging box circuit comprises a first battery, a DC/DC conversion circuit, a first charging switch unit, a first port, a second port, a first communication circuit and a charging box master control circuit;
the first battery is connected with an input end of the DC/DC conversion circuit, an output end of the DC/DC conversion circuit is respectively connected with a first port and a second port through a first charging switch unit, the first communication circuit is connected with the first port, and the charging box main control circuit is respectively connected with the DC/DC conversion circuit, the first charging switch unit and the first communication circuit;
the Bluetooth headset circuit comprises a second battery, a second charging switch unit, a second communication circuit, a Bluetooth headset main control circuit, a third port connected to the first port and a fourth port connected to the second port, the second battery is a rechargeable battery, the second battery is respectively connected with the third port and the fourth port through the second charging switch unit, the second communication circuit is connected with the third port, the Bluetooth headset main control circuit is respectively connected with the second charging switch unit and the second communication circuit, and the Bluetooth headset main control circuit is also connected with the second battery to monitor the charging voltage of the second battery;
the charging box main control circuit is connected with the Bluetooth headset main control circuit through the first communication circuit and the second communication circuit.
As a preferable scheme, the charging box main control circuit comprises a charging box main control chip U2, and the charging box main control chip U2 has a GPIO1 pin, an ADC _ IN1 pin, a GPIO2 pin, an ADC _ IN2 pin, a UART _ RX pin, and a UART _ TX pin;
the GPIO1 pin and the ADC _ IN1 pin are respectively connected with a DC/DC conversion circuit, the GPIO2 pin and the ADC _ IN2 pin are respectively connected with a first charging switch unit, and the UART _ RX pin and the UART _ TX pin are respectively connected with a first communication circuit.
Preferably, the first communication circuit comprises a first switch tube, a second switch tube, a resistor R10 and a resistor R7;
the control end of first switch tube connects UART _ TX pin, and the control end of second switch tube and connect first port are connected to the first end of first switch tube, and the second end and the ground connection of second switch tube are connected to the second end of first switch tube, the first end of second switch tube is connected to UART _ RX pin, resistance R7 has first resistance link and is used for connecting the second resistance link of power VCC, the first end of second switch tube is connected to first resistance link, first port is connected through resistance R10 to second resistance link.
Preferably, the first charging switch unit includes a third switch tube and a resistor R6, and the output terminal of the DC/DC conversion circuit includes a first output terminal and a second output terminal;
the first output end is connected with the second end of the third switching tube, the second end of the third switching tube is connected with the control end of the third switching tube through a resistor R6, the control end of the third switching tube is connected with a GPIO2 pin, the first port is connected with the first end of the third switching tube, and the first end of the third switching tube is connected with an ADC _ IN2 pin.
As a preferred scheme, the bluetooth headset main control circuit comprises a bluetooth headset main control chip U3, wherein the bluetooth headset main control chip U3 has a VBAT pin, a GPIO pin, a UART _ RX1 pin, and a UART _ TX1 pin;
the VBAT pin is connected with the anode of the second battery, the GPIO pin is connected with the second charging switch unit, and a UART _ RX1 pin and a UART _ TX1 pin of the Bluetooth headset main control chip U3 are respectively connected with the second communication circuit.
Preferably, the second communication circuit includes a fourth switching tube, a fifth switching tube, and a resistor R8;
the control end of fourth switch tube connects bluetooth headset main control chip U3's UART _ TX1 pin, and the control end of fifth switch tube and connection third port are connected to the first end of fourth switch tube, and the second end and the ground connection of fifth switch tube are connected to the second end of fourth switch tube, the first end of fifth switch tube is connected to bluetooth headset main control chip U3's UART _ RX1 pin, resistance R8 has third resistance link and is used for connecting the fourth resistance link of power VCC, the first end of fifth switch tube is connected to third resistance link.
Preferably, the second charging switch unit includes a sixth switch tube, a seventh switch tube, an eighth switch tube, a resistor R9 and a resistor R11;
the third port is connected with the first end of the sixth switching tube, the first end of the sixth switching tube is connected with the control end of the eighth switching tube through a resistor R9, the control end of the eighth switching tube is connected with the GPIO pin, the fourth port, the second end of the eighth switching tube and the cathode of the second battery are all grounded, and the first end of the seventh switching tube is connected with the anode of the second battery;
the second end of the sixth switching tube and the second end of the seventh switching tube are both connected with the first end of the eighth switching tube through a resistor R11, and the control end of the sixth switching tube and the control end of the seventh switching tube are both connected with the first end of the eighth switching tube.
Preferably, the DC/DC conversion circuit is connected to the main control circuit of the charging box through a current sampling circuit and a voltage sampling circuit, respectively.
Preferably, the DC/DC conversion circuit includes a DC/DC chip U1, a ninth switching tube, an inductor L1, a diode D1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a resistor R5;
the DC/DC chip U1 is provided with a first pin to an eighth pin, the positive and negative poles of the first battery are connected in parallel with a capacitor C1, the eighth pin is connected with the positive pole of the first battery, one end of an inductor L1 is connected with the eighth pin, the other end of the inductor L1 is connected with the positive pole of a diode D1, the first end of a ninth switching tube is connected with the positive pole of a diode D1, the sixth pin is connected with the control end of the ninth switching tube, the negative pole of the diode D1 is grounded through the capacitor C3, and the negative pole of the diode D1 is connected with the first pin through a capacitor C4;
the current sampling circuit comprises a sampling resistor R3, one end of the sampling resistor R3 is grounded, the other end of the sampling resistor R3 is connected with an ADC _ IN1 pin of the charging box main control circuit, the first pin is connected with the other end of the sampling resistor R3, and the first pin is connected with the second port;
the voltage sampling circuit comprises a sampling resistor R4 and a sampling resistor R5 which are connected IN series, the negative electrode of a diode D1 is connected with a non-series node of the sampling resistor R4, the series node of the sampling resistor R4 and the sampling resistor R5 is connected with a third pin, and the non-series node of the sampling resistor R5 is connected with an ADC _ IN1 pin of the charging box main control circuit;
the fourth pin, the fifth pin and the second end of the ninth switching tube are connected with the cathode of the first battery and grounded; and the GPIO1 pin is connected with a seventh pin, the seventh pin is grounded through a resistor R2, and the second pin is grounded through a capacitor C2 and a resistor R1.
Compared with the prior art, the invention has obvious advantages and beneficial effects, particularly: the Bluetooth headset charging box mainly cancels a traditional voltage reduction circuit in a Bluetooth headset end through the matching of a Bluetooth headset main control circuit and a second charging switch unit, reduces electric energy loss, and then improves the charging conversion efficiency of the Bluetooth headset charging box on the Bluetooth headset;
secondly, the output end of the DC/DC conversion circuit is respectively connected with the main control circuit of the charging box through a current sampling circuit and a voltage sampling circuit, and the main control circuit of the charging box can better control the switching of a DC/DC chip U1 and a third switching tube through sampling current and voltage, so as to better control the charging process;
and the whole circuit structure is ingenious and reasonable in design, and each circuit is stable in performance, safe and reliable.
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a general control block diagram of an embodiment of the present invention;
fig. 2 is a circuit schematic of an embodiment of the invention.
The reference numbers illustrate:
10. bluetooth headset charging box circuit
11. First battery
121. Current sampling circuit 122 and voltage sampling circuit
13. First charging switch unit 14, first port
15. Second port 16, first communication circuit
17. Charging interface
20. Bluetooth earphone circuit
21. Second battery 22, second charging switch unit
23. Third port 24, fourth port
25. A second communication circuit.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 and fig. 2, a charging system for a wireless bluetooth headset with high charging conversion efficiency is mainly applied to a wireless bluetooth headset, and includes a bluetooth headset charging box circuit 10 and a bluetooth headset circuit 20, wherein:
the bluetooth headset charging box circuit 10 comprises a first battery 11, a DC/DC conversion circuit, a first charging switch unit 13, a first port 14, a second port 15, a first communication circuit 16 and a charging box main control circuit;
the first battery 11 is connected to an input end of the DC/DC conversion circuit, an output end of the DC/DC conversion circuit is respectively connected to the first port 14 and the second port 15 through the first charging switch unit 13, the first communication circuit 16 is connected to the first port 14, and the charging box main control circuit is respectively connected to the DC/DC conversion circuit, the first charging switch unit 13, and the first communication circuit 16. Preferably, the first battery 11 is a rechargeable battery, and further includes a charging interface 17 for charging the first battery 11, and two ends of the charging interface 17 are respectively connected to the positive electrode and the negative electrode of the first battery 11. Preferably, the charging interface 17 is a USB charging interface 17.
The bluetooth headset circuit 20 includes a second battery 21, a second charging switch unit 22, a second communication circuit 25, a bluetooth headset main control circuit, a third port 23 connected to the first port 14, and a fourth port 24 connected to the second port 15, the second battery 21 is a rechargeable battery, the second battery 21 is respectively connected to the third port 23 and the fourth port 24 through the second charging switch unit 22, the second communication circuit 25 is connected to the third port 23, the bluetooth headset main control circuit is respectively connected to the second charging switch unit 22 and the second communication circuit 25, and the bluetooth headset main control circuit is further connected to the second battery 21 to monitor a charging voltage of the second battery 21;
the charging box main control circuit is connected with the Bluetooth headset main control circuit through the first communication circuit 16 and the second communication circuit 25.
IN this embodiment, the charging box main control circuit includes a charging box main control chip U2, and the charging box main control chip U2 has a GPIO1 pin, an ADC _ IN1 pin, a GPIO2 pin, an ADC _ IN2 pin, a UART _ RX pin, and a UART _ TX pin;
the GPIO1 pin and the ADC _ IN1 pin are connected to a DC/DC conversion circuit, respectively, the GPIO2 pin and the ADC _ IN2 pin are connected to the first charging switch unit 13, respectively, and the UART _ RX pin and the UART _ TX pin are connected to the first communication circuit 16, respectively.
In this embodiment, the first communication circuit 16 includes a first switch tube, a second switch tube, a resistor R10 and a resistor R7;
the control end of first switch tube connects UART _ TX pin, and the control end of second switch tube and connect first port 14 are connected to the first end of first switch tube, and the second end and the ground connection of second switch tube are connected to the second end of first switch tube, the first end of second switch tube is connected to UART _ RX pin, resistance R7 has first resistance link and is used for connecting the second resistance link of power VCC, the first end of second switch tube is connected to first resistance link, first port 14 is connected through resistance R10 to the second resistance link.
In this embodiment, the first charging switch unit 13 includes a third switch tube and a resistor R6, and the output terminal of the DC/DC conversion circuit includes a first output terminal and a second output terminal;
the first output end is connected with the second end of the third switching tube, the second end of the third switching tube is connected with the control end of the third switching tube through a resistor R6, the control end of the third switching tube is connected with a GPIO2 pin, the first port 14 is connected with the first end of the third switching tube, and the first end of the third switching tube is connected with an ADC _ IN2 pin.
The DC/DC conversion circuit is connected with the main control circuit of the charging box through a current sampling circuit 121 and a voltage sampling circuit 122 respectively. In this embodiment, the DC/DC conversion circuit includes a DC/DC chip U1, a ninth switching tube, an inductor L1, a diode D1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a resistor R5;
the DC/DC chip U1 is provided with a first pin to an eighth pin, the positive and negative poles of the first battery 11 are connected in parallel with a capacitor C1, the eighth pin is connected with the positive pole of the first battery 11, one end of an inductor L1 is connected with the eighth pin, the other end of the inductor L1 is connected with the positive pole of a diode D1, the first end of a ninth switching tube is connected with the positive pole of a diode D1, the sixth pin is connected with the control end of the ninth switching tube, the negative pole of the diode D1 is grounded through the capacitor C3, and the negative pole of the diode D1 is connected with the first pin through a capacitor C4;
the input end comprises a first input end and a second input end, the first input end is an eighth pin, the fourth pin is a second input end, the non-series node of the resistor R4 is a first output end, and the first pin is a second output end.
IN this embodiment, the first pin is a current sampling pin (ISEN pin), the current sampling circuit 121 includes a sampling resistor R3, one end of the sampling resistor R3 is grounded, the other end of the sampling resistor R3 is connected to the ADC _ IN1 pin of the charging box main control circuit, the first pin is connected to the other end of the sampling resistor R3, and the first pin is connected to the second port 15;
IN this embodiment, the third pin is a voltage sampling pin (FB pin), the voltage sampling circuit 122 includes a sampling resistor R4 and a sampling resistor R5 connected IN series, a negative electrode of the diode D1 is connected to a non-series node of the sampling resistor R4, a series node of the sampling resistor R4 and the sampling resistor R5 is connected to the third pin, and a non-series node of the sampling resistor R5 is connected to an ADC _ IN1 pin of the main control circuit of the charging box;
the fourth pin, the fifth pin and the second end of the ninth switching tube are all connected with the negative electrode of the first battery 11 and grounded; and the GPIO1 pin is connected with a seventh pin, the seventh pin is grounded through a resistor R2, and the second pin is grounded through a capacitor C2 and a resistor R1.
In this embodiment, the bluetooth headset main control circuit includes a bluetooth headset main control chip U3, and the bluetooth headset main control chip U3 has a VBAT pin, a GPIO pin, a UART _ RX1 pin, and a UART _ TX1 pin;
the VBAT pin is connected to the positive electrode of the second battery 21, the GPIO pin is connected to the second charging switch unit 22, and the UART _ RX1 pin and the UART _ TX1 pin of the bluetooth headset main control chip U3 are respectively connected to the second communication circuit 25.
The second communication circuit 25 comprises a fourth switching tube, a fifth switching tube and a resistor R8; the control end of fourth switch tube connects bluetooth headset main control chip U3's UART _ TX1 pin, and the control end of fifth switch tube and connection third port 23 are connected to the first end of fourth switch tube, and the second end and the ground connection of fifth switch tube are connected to the second end of fourth switch tube, the first end of fifth switch tube is connected to bluetooth headset main control chip U3's UART _ RX1 pin, resistance R8 has third resistance link and is used for the fourth resistance link of connecting power VCC, the first end of fifth switch tube is connected to third resistance link.
The second charging switch unit 22 comprises a sixth switch tube, a seventh switch tube, an eighth switch tube, a resistor R9 and a resistor R11; the third port 23 is connected to the first end of the sixth switching tube, the first end of the sixth switching tube is connected to the control end of the eighth switching tube through a resistor R9, the control end of the eighth switching tube is connected to the GPIO pin, the fourth port 24, the second end of the eighth switching tube and the cathode of the second battery 21 are all grounded, and the first end of the seventh switching tube is connected to the anode of the second battery 21;
the second end of the sixth switching tube and the second end of the seventh switching tube are both connected with the first end of the eighth switching tube through a resistor R11, and the control end of the sixth switching tube and the control end of the seventh switching tube are both connected with the first end of the eighth switching tube.
The following is a general description of the working principle of the present embodiment:
after the bluetooth headset is placed in the bluetooth headset charging box, the metal thimble is in electrical contact with the corresponding metal contact, that is, the first port 14 of the bluetooth headset charging box circuit 10 is connected with the third port 23 of the bluetooth headset circuit 20, and the second port 15 of the bluetooth headset charging box circuit 10 is connected with the fourth port 24 of the bluetooth headset circuit 20.
The power VCC is transmitted to the control end of the fifth switching tube through the resistor R10, the first port 14 and the third port 23 in sequence, and the fifth switching tube is turned on; at this time, if the second battery 21 still has power, the potential of the UART _ RX1 pin of the bluetooth headset main control chip U3 changes from high to low, and then the bluetooth headset main control chip U3 detects the current battery power of the second battery 21 through the VBAT pin.
When the current battery power of the second battery 21 is detected, the UART _ TX1 pin of the bluetooth headset main control chip U3 sends a first information instruction (at the same time, the UART _ RX1 pin of the bluetooth headset main control chip U3 also receives the first information instruction, but does not perform any processing), the first information instruction is transmitted to the control end of the second switch tube through the fourth switch tube, the third port 23 and the first port 14 in sequence, the second switch tube is conducted or leaked to the ground, and then the UART _ RX pin of the charging box main control chip U2 can receive the first information instruction.
Then, the charging box main control chip U2 starts initialization to read the battery capacity, temperature and circuit status of each part of the first battery 11, after confirming that there is no problem, the UART _ TX pin of the charging box main control chip U2 sends out a second information instruction, the second information instruction will be transmitted to the control end of the fifth switch tube through the first switch tube, the first port 14 and the third port 23 in sequence, the fifth switch tube is turned on, the potential of the UART _ RX1 pin of the bluetooth headset main control chip U3 changes from high to low, that is, the bluetooth headset main control chip U3 can receive the second information instruction, and the information interaction between the charging box main control chip U2 and the bluetooth headset main control chip U3 is completed. It should be noted here that if the bluetooth headset main control chip U3 is still connected to the mobile terminal via bluetooth, the mobile terminal can also receive information about the battery level, temperature and circuit status of each part of the first battery 11.
Under the condition that confirm that bluetooth headset charging box circuit 10 and bluetooth headset circuit 20 do not all have the problem, bluetooth headset main control chip U3's GPIO pin output high potential to the control end of eighth switch tube, the eighth switch tube switches on, and then sixth switch tube and seventh switch tube switch on in proper order, accomplish switching on of second charging switch unit 22. Then, the UART _ TX1 pin of the bluetooth headset main control chip U3 issues a third information command (at the same time, the UART _ RX1 pin of the bluetooth headset main control chip U3 also receives the third information command, but does not perform any processing), the third information command is transmitted to the control terminal of the second switch tube through the fourth switch tube, the third port 23 and the first port 14 in sequence, the second switch tube is turned on or opened to the ground, and then the UART _ RX pin of the charging box main control chip U2 can receive the third information command.
After the charging box main control chip U2 receives the third information instruction, the charging box main control chip U2 controls the DC/DC chip U1 to open through the GPIO1 pin, and then controls the third switching tube to open through the GPIO2 pin, thereby completing the charging initialization and starting to charge the second battery 21. IN the process of charging the second battery 21, the charging box main control chip U2 monitors the voltages at the two ends of the sampling resistor R3 through the pin ADC _ IN1 to monitor the charging current, and the real-time charging voltages at the two ends of the second battery 21 are collected from the VBAT pin by the bluetooth headset main control chip U3 and reported to the charging box main control chip U2 through the fourth switching tube, the third port 23, the first port 14 and the second switching tube IN sequence. When the charging current drops to 0.1C of the preset current, the DC/DC chip U1, the third switch tube, the sixth switch tube and the seventh switch tube are closed in sequence, and the charging of the second battery 21 is completed.
After the bluetooth headset was placed in the bluetooth headset charging box, if the second battery 21 does not have the electric quantity, the information instruction that bluetooth headset main control chip U3 sent just can not be received to the box main control chip U2 that charges, at this moment, the box main control chip U2 that charges will control DC/DC chip U1 and third switch pipe and open, let the second battery 21 charge earlier for it can let bluetooth headset main control chip U3 get electric work, then just can check the battery electric quantity of second battery 21.
In this embodiment, the first switch tube is an NMOS tube Q2, the second switch tube is an NMOS tube Q4, the fourth switch tube is an NMOS tube Q9, the fifth switch tube is an NMOS tube Q8, the eighth switch tube is an NMOS tube Q7, and the ninth switch tube is an NMOS tube Q1, but the first switch tube, the second switch tube, the fourth switch tube, the fifth switch tube, the eighth switch tube, and the ninth switch tube may also be NPN triodes (a collector corresponds to a drain, a base corresponds to a gate, and an emitter corresponds to a source);
the third switch tube is a PMOS tube Q3, the sixth switch tube is a PMOS tube Q5, and the seventh switch tube is a PMOS tube Q6, and of course, the third switch tube, the sixth switch tube, and the seventh switch tube may also be PNP triodes (the collector is equivalent to the drain, the base is equivalent to the gate, and the emitter is equivalent to the source).
The following approximately explains the difference between the charge conversion efficiency of the present embodiment and the charge conversion efficiency of the related art:
the charge conversion efficiency of the present embodiment is as follows: assuming that the internal resistance of the inductor L1 is 0.1 ohm, the forward voltage drop of the diode D1 is 0.15V, the internal resistances of all the switching tubes are 50 milliohm, the charging current is 0.1 ampere, the voltage of the first battery 11BT1 is 3.7V, and the voltage of the second battery 21 is 3.0V (here, the lowest battery voltage V6 and the state of lowest efficiency). Defining the voltage between the source and the drain of a PMOS transistor Q3 as a first voltage V1, the voltage between the source and the drain of a PMOS transistor Q5 as a second voltage V2, the voltage between the source and the drain of a PMOS transistor Q6 as a third voltage V3, the voltage across a sampling resistor R3 as a fourth voltage V4, the forward voltage drop of a diode D1 as a fifth voltage V5, the total output power as an output total power P1, the power of an inductor L1 as a power P2, the power of an NMOS transistor Q1 as a power P3, the input power as an input power P4, the input current as a current I1, the current through the inductor L1 as an I2, and the current through an NMOS transistor Q1 as an I3;
v1= V2= V3=0.1 amps by 0.01 ohms =0.001 volts; v4=0.1 ampere times 0.01 ohm =0.001 volt;
the total output power P1 is the product of the total output voltage and the charging current, wherein the total output voltage is the sum of six of V1, V2, V3, V4, V5 and V6, and the charging current is 0.1 ampere.
Therefore, the total power output:
P1=（V6+V1+V2+V3+V4+V5）*0.1
=（3+0.005+0.005+0.005+0.001+0.15）*0.1
=0.3166 watts.
According to the law of conservation of energy, the following can be obtained: p4= P2+ P3+ P1, wherein P4=3.7 × I1;
thus, 3.7 × I1= (I2 square × 0.1) + (I3 square × 0.1) +0.3166 watts.
In the input boost circuit, the first battery 11, the inductor L1 and the NMOS transistor Q1 are connected in series, so that I1= I2= I3=0.089183 amperes;
overall efficiency: (3.0 volts by 0.1 amps) divided by (3.0 volts by 0.089183 amps) = 90.91%.
The charge conversion efficiency of the prior art is as follows:
under the same condition, the existing bluetooth headset is charged linearly, the current in the whole loop is 0.1 ampere, the output of the DC/DC is always 5.0 volt, the total output power is defined as P0, the input current is defined as I0, the current passing through an inductor L1 is defined as I21, and the current passing through an NMOS transistor Q1 is defined as I31; the forward voltage drop of diode D1 is defined as voltage V0 and is 0.15 volts;
the charge conversion efficiency is calculated as follows:
total output power of
Ptotal = (5.0 volts + V0) times 0.1 amps = (5+0.15) times 0.1 amps =0.515 watts;
in this case, the current in the DC/DC input boost loop is:
i0= I21= I31=0.1450705 amperes;
the total efficiency is:
in view of (3.0 volts times 0.1 ampere) divided by (3.7 volts times 0.1450705 amperes) =55.89%, the circuit efficiency of the present embodiment can be improved as follows: 90.91% -55.89% = 35%.
It should be noted that, in the energy conversion process, the present embodiment only reduces the voltage or increases the voltage, and does not have the voltage or the voltage reduction existing at the same time. Meanwhile, in the embodiment, the charging box main control chip U2 controls and controls the opening of the DC/DC chip U1 and the third switch tube, so that the charging efficiency can be improved to over 90%. In addition, the second charge switch unit 22 is turned on only at the time of charging. Only the internal resistances of the sixth switch tube and the seventh switch tube in the second charging switch unit 22 in the bluetooth headset end cause loss, and the bluetooth headset main control chip U3 and the charging box main control chip U2 of this embodiment consume power, but the loss of both the bluetooth headset main control chip U3 and the charging box main control chip U2 can be neglected.
The Bluetooth headset is mainly characterized in that a traditional voltage reduction circuit in a Bluetooth headset end is cancelled through the matching of a Bluetooth headset main control circuit and a second charging switch unit, so that the electric energy loss is reduced, the charging conversion efficiency of a Bluetooth headset charging box on the Bluetooth headset is improved, in addition, a first communication circuit is connected with a second communication circuit through a first port and a third port and multiplexes the first port and the third port, the single-wire bidirectional communication between the charging box main control circuit and the Bluetooth headset main control circuit is realized, no additional communication circuit is needed, the circuit design cost is reduced, and the Bluetooth headset has better economic benefit;
secondly, the output end of the DC/DC conversion circuit is respectively connected with the main control circuit of the charging box through a current sampling circuit and a voltage sampling circuit, and the main control circuit of the charging box can better control the switching of a DC/DC chip U1 and a third switching tube through sampling current and voltage, so as to better control the charging process;
and the whole circuit structure is ingenious and reasonable in design, and each circuit is stable in performance, safe and reliable.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (9)
1. The utility model provides a high conversion efficiency's that charges true wireless bluetooth headset charging system which characterized in that: including bluetooth headset charging box circuit and bluetooth headset circuit, wherein:
the Bluetooth headset charging box circuit comprises a first battery, a DC/DC conversion circuit, a first charging switch unit, a first port, a second port, a first communication circuit and a charging box master control circuit;
the first battery is a rechargeable battery, the first battery is connected with the input end of the DC/DC conversion circuit, the output end of the DC/DC conversion circuit is respectively connected with the first port and the second port through the first charging switch unit, the first communication circuit is connected with the first port, and the charging box main control circuit is respectively connected with the DC/DC conversion circuit, the first charging switch unit and the first communication circuit;
the Bluetooth headset circuit comprises a second battery, a second charging switch unit, a second communication circuit, a Bluetooth headset main control circuit, a third port connected to the first port and a fourth port connected to the second port, the second battery is a rechargeable battery, the second battery is respectively connected with the third port and the fourth port through the second charging switch unit, the second communication circuit is connected with the third port, the Bluetooth headset main control circuit is respectively connected with the second charging switch unit and the second communication circuit, and the Bluetooth headset main control circuit is also connected with the second battery to monitor the charging voltage of the second battery;
the charging box main control circuit is connected with the Bluetooth headset main control circuit through the first communication circuit and the second communication circuit.
2. The high charge conversion efficiency true wireless bluetooth headset charging system of claim 1, wherein: the charging box main control circuit comprises a charging box main control chip U2, wherein the charging box main control chip U2 is provided with a GPIO1 pin, an ADC _ IN1 pin, a GPIO2 pin, an ADC _ IN2 pin, a UART _ RX pin and a UART _ TX pin;
the GPIO1 pin and the ADC _ IN1 pin are respectively connected with a DC/DC conversion circuit, the GPIO2 pin and the ADC _ IN2 pin are respectively connected with a first charging switch unit, and the UART _ RX pin and the UART _ TX pin are respectively connected with a first communication circuit.
3. The high charge conversion efficiency true wireless bluetooth headset charging system of claim 2, wherein: the first communication circuit comprises a first switch tube, a second switch tube, a resistor R10 and a resistor R7;
the control end of first switch tube connects UART _ TX pin, and the control end of second switch tube and connect first port are connected to the first end of first switch tube, and the second end and the ground connection of second switch tube are connected to the second end of first switch tube, the first end of second switch tube is connected to UART _ RX pin, resistance R7 has first resistance link and is used for connecting the second resistance link of power VCC, the first end of second switch tube is connected to first resistance link, first port is connected through resistance R10 to second resistance link.
4. The high charging conversion efficiency true wireless Bluetooth headset charging system of claim 2 or 3, wherein: the first charging switch unit comprises a third switch tube and a resistor R6, and the output end of the DC/DC conversion circuit comprises a first output end and a second output end;
the first output end is connected with the second end of the third switching tube, the second end of the third switching tube is connected with the control end of the third switching tube through a resistor R6, the control end of the third switching tube is connected with a GPIO2 pin, the first port is connected with the first end of the third switching tube, and the first end of the third switching tube is connected with an ADC _ IN2 pin.
5. The high charge conversion efficiency true wireless bluetooth headset charging system of claim 1, wherein: the Bluetooth headset main control circuit comprises a Bluetooth headset main control chip U3, wherein the Bluetooth headset main control chip U3 is provided with a VBAT pin, a GPIO pin, a UART _ RX1 pin and a UART _ TX1 pin;
the VBAT pin is connected with the anode of the second battery, the GPIO pin is connected with the second charging switch unit, and a UART _ RX1 pin and a UART _ TX1 pin of the Bluetooth headset main control chip U3 are respectively connected with the second communication circuit.
6. The high charge conversion efficiency true wireless Bluetooth headset charging system of claim 5, wherein: the second communication circuit comprises a fourth switching tube, a fifth switching tube and a resistor R8;
the control end of fourth switch tube connects bluetooth headset main control chip U3's UART _ TX1 pin, and the control end of fifth switch tube and connection third port are connected to the first end of fourth switch tube, and the second end and the ground connection of fifth switch tube are connected to the second end of fourth switch tube, the first end of fifth switch tube is connected to bluetooth headset main control chip U3's UART _ RX1 pin, resistance R8 has third resistance link and is used for connecting the fourth resistance link of power VCC, the first end of fifth switch tube is connected to third resistance link.
7. The high charging conversion efficiency true wireless Bluetooth headset charging system of claim 5 or 6, wherein: the second charging switch unit comprises a sixth switch tube, a seventh switch tube, an eighth switch tube, a resistor R9 and a resistor R11;
the third port is connected with the first end of the sixth switching tube, the first end of the sixth switching tube is connected with the control end of the eighth switching tube through a resistor R9, the control end of the eighth switching tube is connected with the GPIO pin, the fourth port, the second end of the eighth switching tube and the cathode of the second battery are all grounded, and the first end of the seventh switching tube is connected with the anode of the second battery;
the second end of the sixth switching tube and the second end of the seventh switching tube are both connected with the first end of the eighth switching tube through a resistor R11, and the control end of the sixth switching tube and the control end of the seventh switching tube are both connected with the first end of the eighth switching tube.
8. The high charge conversion efficiency true wireless bluetooth headset charging system of claim 2, wherein: and the DC/DC conversion circuit is connected with the main control circuit of the charging box through a current sampling circuit and a voltage sampling circuit respectively.
9. The high charge conversion efficiency true wireless bluetooth headset charging system of claim 8, wherein: the DC/DC conversion circuit comprises a DC/DC chip U1, a ninth switching tube, an inductor L1, a diode D1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5;
the DC/DC chip U1 is provided with a first pin to an eighth pin, the positive and negative poles of the first battery are connected in parallel with a capacitor C1, the eighth pin is connected with the positive pole of the first battery, one end of an inductor L1 is connected with the eighth pin, the other end of the inductor L1 is connected with the positive pole of a diode D1, the first end of a ninth switching tube is connected with the positive pole of a diode D1, the sixth pin is connected with the control end of the ninth switching tube, the negative pole of the diode D1 is grounded through the capacitor C3, and the negative pole of the diode D1 is connected with the first pin through a capacitor C4;
the current sampling circuit comprises a sampling resistor R3, one end of the sampling resistor R3 is grounded, the other end of the sampling resistor R3 is connected with an ADC _ IN1 pin of the charging box main control circuit, the first pin is connected with the other end of the sampling resistor R3, and the first pin is connected with the second port;
the voltage sampling circuit comprises a sampling resistor R4 and a sampling resistor R5 which are connected IN series, the negative electrode of a diode D1 is connected with a non-series node of the sampling resistor R4, the series node of the sampling resistor R4 and the sampling resistor R5 is connected with a third pin, and the non-series node of the sampling resistor R5 is connected with an ADC _ IN1 pin of the charging box main control circuit;
the fourth pin, the fifth pin and the second end of the ninth switching tube are connected with the cathode of the first battery and grounded; and the GPIO1 pin is connected with a seventh pin, the seventh pin is grounded through a resistor R2, and the second pin is grounded through a capacitor C2 and a resistor R1.
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