CN-224233378-U - Automatic voltage detection circuit of intelligent battery charger

CN224233378UCN 224233378 UCN224233378 UCN 224233378UCN-224233378-U

Abstract

The utility model discloses a voltage automatic detection circuit of an intelligent battery charger, which comprises a power input module, a main control chip, a voltage detection module, a charging control module and a battery module, wherein the battery module is connected with a BATT pin of the main control chip, the voltage detection module is used for monitoring the voltage of the battery module and feeding back a voltage signal to the main control chip, and the charging control module is used for receiving a control signal from the main control chip and adjusting the charging current of the battery module. The utility model provides stable voltage for the main control chip through the power input module, the voltage detection module enables the main control chip to sense the voltage change of the battery in real time and dynamically adjust the charging mode, so as to avoid overcharging or undercharging of the battery, and the charging control module adjusts the charging current according to the signal of the main control chip, so that the charging is fast carried out when the voltage is low, and the trickle mode is entered when the voltage is close to full power, so that the charging efficiency is improved and the service life of the battery is prolonged.

Inventors

FAN JIGUANG
YU DEMAO
LIU PEIYANG
WANG CHUPENG

Assignees

深圳市纽莱克科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250313

Claims (7)

1. The voltage automatic detection circuit of the intelligent battery charger is characterized by comprising a power input module, a main control chip, a voltage detection module, a charging control module and a battery module; The power input module is connected with the DCIN pin of the main control chip and is used for providing input voltage for the main control chip; The battery module is connected with the BATT pin of the main control chip; The voltage detection module is connected with a CSSP pin and a CSSN pin of the main control chip and is used for monitoring the voltage of the battery module and feeding back a voltage signal to the main control chip; The charging control module is connected with the DHI pin, the DLO pin and the CSIN pin of the main control chip, and is used for receiving a control signal from the main control chip and adjusting the charging current of the battery module.
2. The automatic voltage detection circuit of an intelligent battery charger according to claim 1, wherein the power input module comprises a resistor R6, a resistor R7, a field effect transistor P3, a diode D4, a capacitor C5, and a capacitor C22; One end of a power input end is connected with the first end of the resistor R6, the anode of the diode D4 and the drain electrode of the field effect transistor P3, the second end of the resistor R6 is respectively connected with an ACIN pin of the main control chip and the first end of the resistor R7, and the second end of the resistor R7 is connected with the first end of the capacitor C5; The DCIN pin of the main control chip is respectively connected with the second end of the capacitor C5 and the cathode of the diode D4, the grid electrode of the field effect transistor P3 is connected with the PDS pin of the main control chip, the source electrode of the field effect transistor P3 is respectively connected with the first end of the capacitor C22 and the SRC pin of the main control chip, and the second end of the capacitor C22 is grounded.
3. The automatic voltage detection circuit of an intelligent battery charger according to claim 2, wherein the voltage detection module comprises a detection resistor RS1, a capacitor C1, and a capacitor C17; The first end of the detection resistor RS1 is connected with a CSSP pin of the main control chip and a source electrode of the effect transistor P3 respectively, the second end of the detection resistor RS1 is connected with a CSSN pin of the main control chip and one end of the capacitor C1 respectively, the second end of the capacitor C1 is grounded, the first end of the capacitor C17 is connected with a DHIV pin of the main control chip, and the second end of the capacitor C17 is connected with an SRC pin of the main control chip.
4. The automatic voltage detection circuit of the intelligent battery charger according to claim 3, wherein the charge control module comprises a detection resistor RS2, a field effect transistor P1, a field effect transistor P2, a field effect transistor N1, an inductance L1, and a capacitance C4; the source electrode of the field effect transistor P1 is connected with a CSSN pin of the main control chip, the grid electrode of the field effect transistor P1 is connected with a DHI pin of the main control chip, and the drain electrode of the field effect transistor P1 is respectively connected with the first end of the inductor L1 and the drain electrode of the field effect transistor N1; The grid electrode of the field effect transistor N1 is connected with a DLO pin of the main control chip, the source electrode of the field effect transistor N1 is grounded, and the second end of the inductor L1 is respectively connected with a CSIP pin of the main control chip and the first end of the detection resistor RS 2; The second end of the detection resistor RS2 is respectively connected with the CSIN pin of the main control chip, the first end of the capacitor C4 and the positive electrode of the battery module, and the second end of the capacitor C4 is grounded; The grid electrode of the field effect transistor P2 is connected with a PDL pin of the main control chip, the drain electrode of the field effect transistor P2 is connected with a BATT pin of the main control chip, and the source electrode of the field effect transistor P2 is connected with a CSSN pin of the main control chip.
5. The automatic voltage detection circuit of an intelligent battery charger according to claim 4, wherein the charging control module further comprises a resistor R13, a capacitor C13 and a capacitor C16, the LDO pin of the main control chip is connected to the first end of the capacitor C13 and the first end of the resistor R13, the second end of the capacitor C13 is grounded, the second end of the resistor R13 is connected to the DLOV pin of the main control chip and the first end of the capacitor C16, and the second end of the capacitor C16 is grounded.
6. The automatic voltage detection circuit of an intelligent battery charger according to claim 3, wherein the voltage detection module further comprises a resistor R5, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12; the first end of the resistor R5 is connected with the CCV pin of the main control chip, the second end of the resistor R5 is connected with the first end of the capacitor C11, the second end of the capacitor C11 is grounded, the first end of the capacitor C9 is connected with the CCI pin of the main control chip, the second end of the resistor R5 is grounded after being connected with the first end of the capacitor C10, the second end of the capacitor C10 is connected with the CCS pin of the main control chip, the REF pin of the main control chip is connected with the first end of the capacitor C12, and the second end of the capacitor C12 is grounded.
7. The automatic voltage detection circuit of an intelligent battery charger according to any one of claims 1 to 6, wherein the model of the main control chip is MAX8725.

Description

Automatic voltage detection circuit of intelligent battery charger Technical Field The utility model relates to the field of battery chargers, in particular to a voltage automatic detection circuit of an intelligent battery charger. Background The battery charger is a device for supplying electric energy to a battery, and the principle of the battery charger is that the electric energy is converted into current and voltage parameters meeting the charging requirement of the battery through a power supply so as to realize safe and efficient charging of the battery. In the prior art, in the charging process of a battery charger, an accurate voltage detection mechanism is often lacking, so that an automatic charging mode adjustment cannot be realized when the battery is in different charging states, the condition of overcharging or undercharging is easy to occur, the battery performance is affected, the service life of the battery is shortened, and even potential safety hazards are caused. Accordingly, the prior art has drawbacks and needs improvement. Disclosure of utility model The utility model aims to solve the technical problem of providing a voltage automatic detection circuit of an intelligent battery charger, which can automatically adjust a charging mode according to voltage and avoid overcharge or undercharge. The utility model adopts the following technical scheme that the voltage automatic detection circuit of the intelligent battery charger comprises a power input module, a main control chip, a voltage detection module, a charging control module and a battery module; The power input module is connected with the DCIN pin of the main control chip and is used for providing input voltage for the main control chip; The battery module is connected with the BATT pin of the main control chip; The voltage detection module is connected with a CSSP pin and a CSSN pin of the main control chip and is used for monitoring the voltage of the battery module and feeding back a voltage signal to the main control chip; The charging control module is connected with the DHI pin, the DLO pin and the CSIN pin of the main control chip, and is used for receiving a control signal from the main control chip and adjusting the charging current of the battery module. By adopting the technical scheme, in the automatic voltage detection circuit of the intelligent battery charger, the power input module comprises a resistor R6, a resistor R7, a field effect transistor P3, a diode D4, a capacitor C5 and a capacitor C22; One end of a power input end is connected with the first end of the resistor R6, the anode of the diode D4 and the drain electrode of the field effect transistor P3, the second end of the resistor R6 is respectively connected with an ACIN pin of the main control chip and the first end of the resistor R7, and the second end of the resistor R7 is connected with the first end of the capacitor C5; The DCIN pin of the main control chip is respectively connected with the second end of the capacitor C5 and the cathode of the diode D4, the grid electrode of the field effect transistor P3 is connected with the PDS pin of the main control chip, the source electrode of the field effect transistor P3 is respectively connected with the first end of the capacitor C22 and the SRC pin of the main control chip, and the second end of the capacitor C22 is grounded. By adopting the technical scheme, in the voltage automatic detection circuit of the intelligent battery charger, the voltage detection module comprises a detection resistor RS1, a capacitor C1 and a capacitor C17; The first end of the detection resistor RS1 is connected with a CSSP pin of the main control chip and a source electrode of the effect transistor P3 respectively, the second end of the detection resistor RS1 is connected with a CSSN pin of the main control chip and one end of the capacitor C1 respectively, the second end of the capacitor C1 is grounded, the first end of the capacitor C17 is connected with a DHIV pin of the main control chip, and the second end of the capacitor C17 is connected with an SRC pin of the main control chip. By adopting the technical scheme, in the automatic voltage detection circuit of the intelligent battery charger, the charging control module comprises a detection resistor RS2, a field effect transistor P1, a field effect transistor P2, a field effect transistor N1, an inductor L1 and a capacitor C4; the source electrode of the field effect transistor P1 is connected with a CSSN pin of the main control chip, the grid electrode of the field effect transistor P1 is connected with a DHI pin of the main control chip, and the drain electrode of the field effect transistor P1 is respectively connected with the first end of the inductor L1 and the drain electrode of the field effect transistor N1; The grid electrode of the field effect transistor N1 is connected with a DLO pin of the main control chip, the source electrode of the field effec