CN113395804B - Charging indicator lamp driving circuit of Bluetooth product - Google Patents

Charging indicator lamp driving circuit of Bluetooth product Download PDF

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Publication number
CN113395804B
CN113395804B CN202110745552.5A CN202110745552A CN113395804B CN 113395804 B CN113395804 B CN 113395804B CN 202110745552 A CN202110745552 A CN 202110745552A CN 113395804 B CN113395804 B CN 113395804B
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resistor
diode
charging
bluetooth
switching tube
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CN113395804A (en
Inventor
沈庆凯
胡平
李鑫
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Risuntek Inc
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Risuntek Inc
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H02J7/0049—Detection of fully charged condition
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a charging indicator lamp driving circuit of a Bluetooth product, which comprises a first branch circuit and a second branch circuit; the first branch circuit comprises a battery voltage VBAT, a diode D2, a resistor R8, a first LED indicator light LED1, a first switching tube, a resistor R5, a resistor R2, a diode D3, a resistor R9 and a resistor R4 which are connected in series, and the second branch circuit comprises a diode D1, a resistor R7, a second LED indicator light LED2, a second switching tube, a resistor R6, a resistor R1, a resistor R3 and an external charging voltage VBUS which is larger than the battery voltage VBAT during charging; its whole circuit structure design is ingenious reasonable, need not to start bluetooth main control chip and need not to be driven by bluetooth main control chip when charging, ensures in charging process, and all circuits except that charge do not start, do not consume the electric quantity of battery in the bluetooth product, also guarantee to remove charged state no matter how long after being full of electricity, and the battery is full charge state in the bluetooth product, improves user's use and experiences and feels.

Description

Charging indicator lamp driving circuit of Bluetooth product
Technical Field
The invention relates to the technical field of a charging indicator lamp driving circuit, in particular to a charging indicator lamp driving circuit of a Bluetooth product, which is mainly applied to a Bluetooth headset.
Background
The existing Bluetooth products such as Bluetooth earphones already occupy the main market of the earphones, but the neck-hung Bluetooth earphones still occupy a place. In order to charge safely, many brands have appointed the charging scheme, still have low-battery display and bluetooth function demonstration simultaneously when realizing the display function that charges, all need be accomplished by bluetooth main chip above.
Because bluetooth master control chip is by battery powered, still can consume certain electric quantity after the shutdown, does not use for a long time, and battery voltage can fall below bluetooth master control chip starting voltage, and this just leads to the initial stage for the earphone charges, and when battery voltage did not rise to bluetooth master control chip starting voltage, the pilot lamp that charges of earphone can't light. Under this condition, when the user charges for the earphone, the discovery pilot lamp is not bright, can think that the earphone has damaged or the charging wire is not inserted well, influences the use and experiences the sense.
After charging is completed, in order to ensure that the battery is not overcharged, the charging circuit can cut off the power supply of the external power supply, and in order to prompt a user that the battery is fully charged, the full-charge indicator lamp can be lightened until the user removes the charging. During the period, the Bluetooth main control chip and the full-power indicator lamp can continuously consume the electric quantity in the battery, if the user removes the charging without urgency, the full-power can be consumed to a part, and the battery is not in a full-power state when the charging is removed.
Therefore, in the present patent application, the applicant has studied a charging indicator driving circuit of a bluetooth product elaborately to solve the above-mentioned problems.
Disclosure of Invention
The invention aims at the defects of the prior art, and mainly aims to provide a charging indicator lamp driving circuit of a Bluetooth product, which has an ingenious and reasonable overall circuit structure design, does not need to start a Bluetooth main control chip and be driven by the Bluetooth main control chip during charging, ensures that all circuits except charging are not started during charging, does not consume the electric quantity of a battery in the Bluetooth product, and also ensures that the battery in the Bluetooth product is in a full-charge state no matter how long the charging state is removed after full charge, thereby improving the use experience of a user.
In order to achieve the purpose, the invention adopts the following technical scheme:
a charging indicator lamp driving circuit of a Bluetooth product comprises a first branch circuit and a second branch circuit;
the first branch circuit comprises a battery voltage VBAT, a diode D2, a resistor R8, a first LED indicator lamp LED1, a first switching tube, a resistor R5, a resistor R2, a diode D3, a resistor R9 and a resistor R4 which are connected in series, wherein the resistor R2 is provided with a first resistor end and a second resistor end used for being connected with a GREEN _ LED end of the Bluetooth main control chip;
the battery voltage VBAT is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the anode of a first LED indicator light LED1 through a resistor R8, the cathode of the first LED indicator light LED1 is connected with the first end of a first switch tube, the control end of the first switch tube is connected with the first resistor end, the control end of the first switch tube is further grounded through a resistor R5, and the first switch tube is an NMOS tube Q2 or an NPN triode Q2;
the second branch circuit comprises a diode D1, a resistor R7, a second LED indicator light LED2, a second switching tube, a resistor R6, a resistor R1, a resistor R3 and an external charging voltage VBUS which is larger than the battery voltage VBAT during charging, the resistor R6 is provided with a third resistor end and a fourth resistor end used for being connected with a CHG _ LED end of a charging circuit, and the resistor R1 is provided with a fifth resistor end and a sixth resistor end used for being connected with a RED _ LED end of a Bluetooth main control chip;
the external charging voltage VBUS is connected with the anode of a diode D1, the cathode of a diode D1 is connected with the cathode of a diode D2, the cathode of a diode D1 is further connected with the anode of a second LED indicator light LED2 through a resistor R7, the cathode of the second LED indicator light LED2 is respectively connected with a third resistor end and a first end of a second switching tube, the control end of the second switching tube is further grounded through a resistor R3, the second switching tube is an NMOS tube Q1 or an NPN triode Q1, and the second end of the first switching tube and the second end of the second switching tube are both grounded;
the external charging voltage VBUS is further connected with a non-series node of a resistor R9, a series node of the resistor R9 and the resistor R4 is connected with the anode of a diode D3, the cathode of the diode D3 is connected with a fourth resistor end, and the non-series node of the resistor 4 is connected with the control end of the first switching tube.
Preferably, the first LED indicator light LED1 is green.
Preferably, the second LED indicator light LED2 is red.
Compared with the prior art, the invention has obvious advantages and beneficial effects, particularly: the whole circuit structure design is ingenious reasonable, when charging, first pilot lamp and second pilot lamp are only supplied power by outside charging voltage VBUS, need not to start bluetooth main control chip and need not to be driven by bluetooth main control chip, ensure in the charging process, all circuits except that charge do not start, do not consume the electric quantity of battery in the bluetooth product, no matter how long time remove the charged state after also guaranteeing to be full of the electricity, the battery is full of the electric state in the bluetooth product, improve user's use and experience and feel.
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 schematic circuit diagram of a preferred embodiment of the present invention;
the reference numbers illustrate:
10. Charging circuit
20. Bluetooth master control chip.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, a charging indicator lamp driving circuit of a bluetooth product includes a first branch circuit and a second branch circuit;
the first branch circuit comprises a battery voltage VBAT, a diode D2, a resistor R8, a first LED indicator lamp LED1, a first switching tube, a resistor R5, a resistor R2, a diode D3, a resistor R9 and a resistor R4 which are connected in series, wherein the resistor R2 is provided with a first resistor end and a second resistor end used for being connected with a GREEN _ LED end of the Bluetooth main control chip;
the battery voltage VBAT is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the anode of the first LED indicator LED1 through the resistor R8, and the cathode of the first LED indicator LED1 is connected to the first end of the first switching tube.
The control end of the first switching tube is connected with the first resistor end, the control end of the first switching tube is also grounded through a resistor R5, and the first switching tube is an NMOS tube Q2 or an NPN triode Q2; in this embodiment, the first switch tube is an NPN transistor Q2, wherein a base of the NPN transistor Q2 is a control terminal of the first switch tube, a collector of the NPN transistor Q2 is a first terminal of the first switch tube, and an emitter of the NPN transistor Q2 is a second terminal of the first switch tube.
The second branch circuit comprises a diode D1, a resistor R7, a second LED indicator light LED2, a second switching tube, a resistor R6, a resistor R1, a resistor R3 and an external charging voltage VBUS, wherein the external charging voltage VBUS is used for enabling the voltage value of the external charging voltage VBAT to be larger than the voltage value of the battery voltage VBAT during charging, the resistor R6 is provided with a third resistor end and a fourth resistor end used for being connected with a CHG _ LED end of a charging circuit, and the resistor R1 is provided with a fifth resistor end and a sixth resistor end used for being connected with a RED _ LED end of a Bluetooth main control chip;
the external charging voltage VBUS is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the cathode of the diode D2, the cathode of the diode D1 is further connected to the anode of the second LED indicator LED2 through the resistor R7, the second LED indicator LED2 is red, and the second LED indicator LED2 may also be an LED indicator of another color, which is not limited herein.
A negative electrode of the second LED indicator light LED2 is respectively connected to the third resistor end and the first end of the second switch tube, a control end of the second switch tube is further grounded through a resistor R3, the second switch tube is an NMOS tube Q1 or an NPN triode Q1, and the second end of the first switch tube and the second end of the second switch tube are both grounded; in this embodiment, the second switching tube is an NPN transistor Q1, wherein a base of the NPN transistor Q1 is a control terminal of the second switching tube, a collector of the NPN transistor Q1 is a first terminal of the second switching tube, and an emitter of the NPN transistor Q1 is a second terminal of the second switching tube.
The external charging voltage VBUS is further connected with a non-series node of a resistor R9, a series node of the resistor R9 and the resistor R4 is connected with the anode of a diode D3, the cathode of the diode D3 is connected with a fourth resistor end, and the non-series node of the resistor 4 is connected with the control end of the first switching tube.
The following will take bluetooth headset as an example to roughly explain the working principle of the following embodiment:
the external charging voltage VBUS is the voltage of the external charging input, which for bluetooth headsets is typically 5 volts; the battery voltage VBAT is the power supply voltage of the internal battery of the Bluetooth headset, and for the lithium ion battery, the highest voltage is 4.2V; the CHG _ LED end is output from an indicator lamp of a charging chip in the charging circuit 10 in a leakage mode, and can directly drive a corresponding LED indicator lamp; the GREEN _ LED terminal and RED _ LED terminal of the bluetooth main control chip 20 are GPIO ports of the bluetooth main control chip 20, respectively.
When the bluetooth headset is charged, the external charging voltage VBUS is powered on, and the charging chip in the charging circuit 10 is started, which determines the corresponding charging state (trickle, constant current, constant voltage, float charge, and end) according to the battery voltage.
In the charging process, the CHG _ LED terminal of the charging circuit 10 is an open-drain low-potential output, the external charging voltage VBUS passes through the diode D1, the resistor R7, the second LED indicator LED2 and the resistor R6 and then passes through the charging chip to form a loop, and the second LED indicator LED2 is turned on, that is, the red light is turned on. Meanwhile, the external charging voltage VBUS forms a loop through the resistor R9, the diode D3 and the charging chip, since the voltage drop of the diode D3 is less than 0.7v, the voltage between the anode of the diode D3 and the ground is less than 0.7v, and then, since the voltage of the resistor R4 and the resistor R5 is divided, the base voltage of the NPN triode Q2 is lower, and the base voltage of the NPN triode Q2 needs to be greater than or equal to 0.7v to be turned on, so that the first LED indicator light LED1 is not lit, that is, the green light is not lit.
After the charging is finished, the CHG _ LED end of the charging circuit 10 is open-drain high-resistance output, at this time, the external charging voltage VBUS cannot form a loop to the ground through the diode D1, the resistor R7, the second LED indicator light LED2, the resistor R6 and the charging chip, and meanwhile, the external charging voltage VBUS cannot form a loop to the ground through the resistor R9, the diode D3 and the charging chip, and the red light is not on;
however, after the external charging voltage VBUS is divided by the resistor R9, the resistor R4 and the resistor R5, the base voltage of the NPN transistor Q2 is greater than 0.7v (i.e., the voltage across the resistor R5), the NPN transistor Q2 is turned on, the external charging voltage VBUS forms a loop to the ground through the diode D1, the resistor R8, the first LED indicator light LED1 and the NPN transistor Q2, and the first LED indicator light LED1 is turned on, that is, the green light is turned on, so that the display of the charging completion is realized.
In the charging process, since the external charging voltage VBUS is always higher than the battery voltage VBAT, and the voltage drops of the diode D1 and the diode D2 are equal, when the diode D1 is turned on, the voltage obtained at the cathodes of the diode D1 and the diode D2 is the difference between the external charging voltage VBUS and 0.7, and therefore, the voltage at the two ends of the diode D2 is far less than 0.7V, and the two ends of the diode D2 cannot be turned on at all.
When the charging device is in use, the external charging voltage VBUS is not supplied with power, so that the diode D1, the resistor R9 and the resistor R4 connected with the external charging voltage VBUS are not in effect, the charging chip is not started, and the resistor R6 and the diode D3 connected with the charging chip are not in effect.
When the RED _ LED end of the bluetooth main control chip 20 outputs a high potential, the NPN transistor Q1 is turned on, the battery voltage VBAT forms a loop through the diode D2, the resistor R7, the second LED indicator LED2, and the NPN transistor Q1, and the second LED indicator LED2 is turned on, that is, the RED light is turned on, so as to realize low power display;
when the GREEN _ LED end of the bluetooth main control chip 20 outputs a high voltage, the NPN transistor Q2 is turned on, the battery voltage VBAT forms a loop through the diode D2, the resistor R8, the first LED indicator LED1, and the NPN transistor Q2, and the first LED indicator LED1 is turned on, that is, the GREEN light is turned on, thereby implementing bluetooth function display.
The invention has the design key points that the whole circuit structure is ingenious and reasonable in design, when in charging, the first indicator lamp and the second indicator lamp are only powered by the external charging voltage VBUS, a Bluetooth main control chip does not need to be started and driven by the Bluetooth main control chip, all circuits except for charging are not started in the charging process, the electric quantity of a battery in a Bluetooth product is not consumed, the battery in the Bluetooth product is in a full-charge state no matter how long the charging state is removed after the Bluetooth product is fully charged, and the use experience of a user is improved.

Claims (3)

1. The utility model provides a charge indicator lamp drive circuit of bluetooth product which characterized in that: comprises a first branch and a second branch;
the first branch circuit comprises a battery voltage VBAT, a diode D2, a resistor R8, a first LED indicator lamp LED1, a first switching tube, a resistor R5, a resistor R2, a diode D3, a resistor R9 and a resistor R4 which are connected in series, wherein the resistor R2 is provided with a first resistor end and a second resistor end used for being connected with a GREEN _ LED end of the Bluetooth main control chip;
the battery voltage VBAT is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the anode of a first LED indicator light LED1 through a resistor R8, the cathode of the first LED indicator light LED1 is connected with the first end of a first switch tube, the control end of the first switch tube is connected with the first resistor end, the control end of the first switch tube is further grounded through a resistor R5, and the first switch tube is an NMOS tube Q2 or an NPN triode Q2;
the second branch circuit comprises a diode D1, a resistor R7, a second LED indicator light LED2, a second switching tube, a resistor R6, a resistor R1, a resistor R3 and an external charging voltage VBUS which is larger than the battery voltage VBAT during charging, the resistor R6 is provided with a third resistor end and a fourth resistor end used for being connected with a CHG _ LED end of a charging circuit, and the resistor R1 is provided with a fifth resistor end and a sixth resistor end used for being connected with a RED _ LED end of a Bluetooth main control chip;
the external charging voltage VBUS is connected with the anode of a diode D1, the cathode of a diode D1 is connected with the cathode of a diode D2, the cathode of a diode D1 is further connected with the anode of a second LED indicator light LED2 through a resistor R7, the cathode of the second LED indicator light LED2 is respectively connected with a third resistor end and a first end of a second switching tube, the control end of the second switching tube is further grounded through a resistor R3, the second switching tube is an NMOS tube Q1 or an NPN triode Q1, and the second end of the first switching tube and the second end of the second switching tube are both grounded;
the external charging voltage VBUS is further connected with a non-series node of the resistor R9, a series node of the resistor R9 and the resistor R4 is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the fourth resistor end, and a non-series node of the resistor R4 is connected with the control end of the first switching tube.
2. The charging indicator lamp driving circuit of claim 1, wherein: the first LED indicator light LED1 is green.
3. The charging indicator lamp driving circuit of claim 1, wherein: the second LED indicator light LED2 is red.
CN202110745552.5A 2021-07-01 2021-07-01 Charging indicator lamp driving circuit of Bluetooth product Active CN113395804B (en)

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CN202110745552.5A CN113395804B (en) 2021-07-01 2021-07-01 Charging indicator lamp driving circuit of Bluetooth product

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CN113395804B true CN113395804B (en) 2022-08-12

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060091822A (en) * 2005-02-15 2006-08-22 박성용 Emergency lamp
CN203933124U (en) * 2014-07-03 2014-11-05 深圳市保绿源科技有限公司 A kind of single interface portable power source, bluetooth keyboard and protective sleeve
CN105472821A (en) * 2015-12-18 2016-04-06 深圳市中孚能电气设备有限公司 Lamp and mobile power supply circuit thereof
CN110380471A (en) * 2019-07-04 2019-10-25 深圳市亿道数码技术有限公司 A kind of control circuit and its control method of double charging indicator lights

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060091822A (en) * 2005-02-15 2006-08-22 박성용 Emergency lamp
CN203933124U (en) * 2014-07-03 2014-11-05 深圳市保绿源科技有限公司 A kind of single interface portable power source, bluetooth keyboard and protective sleeve
CN105472821A (en) * 2015-12-18 2016-04-06 深圳市中孚能电气设备有限公司 Lamp and mobile power supply circuit thereof
CN110380471A (en) * 2019-07-04 2019-10-25 深圳市亿道数码技术有限公司 A kind of control circuit and its control method of double charging indicator lights

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