CN-115395773-B - Dual-channel independent automatic battery load identification step-up and step-down circuit

Abstract

A dual-channel independent automatic identification battery load lifting circuit comprises a low-voltage lifting control chip, an energy storage inductor, a rechargeable battery, a first battery load and a second battery load, wherein the lifting control chip comprises a lifting control module, a load detection module, a lifting bypass capacitor, a first detection resistor, a second detection resistor, an output port VOUT1, an output port VOUT2, a first detection port VEND1, a second detection port VEND2 and a ground end GND, the rechargeable battery is connected between a port BAT and the ground end GND, the first battery load is connected between the output port VOUT1 and the ground end GND, the second battery load is connected between the output port VOUT2 and the ground end GND, the first detection resistor is connected between the first detection port VEND1 and the ground end GND, and the second detection resistor is connected between the second detection port VEND2 and the ground end GND. Therefore, the invention realizes independent automatic identification and three-section charge management of the dual-channel battery load by adding the load detection module to detect the voltage of the output end and the detection port.

Inventors

• BAN FUKUI

Assignees

• 上海裕芯电子科技有限公司

Dates

Publication Date

20260508

Application Date

20211027

Claims (7)

1. 1. The dual-channel independent automatic battery load identification buck-boost circuit is characterized by comprising a buck-boost control chip, an energy storage inductor, a rechargeable battery, a first battery load and a second battery load, and is characterized in that the buck-boost control chip comprises a buck-boost control module, a load detection module, a boost bypass capacitor, a first detection resistor, a second detection resistor, a power supply port VIN, an inductance port LX, a charging port BAT, a buck-boost port PMID, an output port VOUT1, an output port VOUT2, a first detection port VEND1, a second detection port VEND2 and a ground end GND; The port VIN receives the voltage of the power supply; the energy storage inductor is connected between the port LX and the port BAT, the anode of the rechargeable battery is connected between the port BAT, the cathode of the rechargeable battery is connected with the ground end GND, the first battery load is connected between the output port VOUT1 and the ground end GND, the second battery load is connected between the output port VOUT2 and the ground end GND, the boost bypass capacitor is connected between the boost-buck port PMID and the ground end GND, the first detection resistor is connected between the first detection port VEND1 and the ground end GND, and the second detection resistor is connected between the second detection port VEND2 and the ground end GND; The load detection module is used for respectively detecting the voltages of the output port VOUT1, the output port VOUT2, the first detection port VEND1 and the second detection port VEND 2; The load detection module comprises a load controller, a first charge channel PMOS tube, a first charge sampling PMOS tube, a second charge channel PMOS tube and a second charge sampling PMOS tube, wherein grid electrodes of the first charge channel PMOS tube, the first charge sampling PMOS tube, the second charge channel PMOS tube and the second charge sampling PMOS tube are connected with the load controller, a source electrode of the first charge channel PMOS tube is connected with a buck-boost port PMID and is connected with a power supply port VIN through an input high-voltage isolation module, a drain electrode of the first charge channel PMOS tube is connected with an output port VOUT1 and the load controller, a drain electrode of the first charge sampling PMOS tube is connected with a first detection port VEND1 and the load controller, a drain electrode of the second charge channel PMOS tube is connected with an output port VOUT2 and the load controller, and a drain electrode of the second charge sampling PMOS tube is connected with a second detection port VEND2 and the load controller, wherein the load controller respectively outputs different signals VGT1 and VGT2 according to the output port VOUT1, the first detection port VEND1, the output port VOUT2 and the feedback signals of the second detection port VEND2, and the load controller are connected with the first charge channel PMOS tube, the first charge sampling PMOS tube, the first charge channel PMOS tube, the second charge sampling PMOS tube and the first charge sampling PMOS tube and the second charge sampling PMOS tube and the first charge sampling tube and the second charge sampling PMOS tube; The first section of charging, namely when the load controller detects that the output port VOUT1 is smaller than V13, the first charging channel PMOS tube is in a trickle charging mode, the voltage value of the first detection port VEND1 is V3, when the load controller detects that the output port VOUT2 is smaller than V23, the second charging channel PMOS tube is in a trickle charging mode, and the voltage value of the second detection port VEND2 is V3; The second section of charging, namely when the load controller detects that the output port V13 is less than or equal to VOUT1 and less than or equal to V12, the first charging channel PMOS tube is in a constant current charging mode, the voltage value of the first detection port VEND1 is V2, the charging current is 100% of a set value, and similarly, when the load controller detects that the output port V23 is less than or equal to VOUT2 and less than or equal to V22, the second charging channel PMOS tube is in a constant current charging mode, the voltage value of the second detection port VEND2 is V2, and the charging current is 100% of the set value; The third stage of charging, namely when the load controller detects that the output port V12 is less than or equal to VOUT1 and is less than or equal to V11, the first charging channel PMOS tube is in a constant voltage charging mode, charging current linearly drops along with the voltage of the output port VOUT1, and charging is finished when the voltage value of the first detection port VEND1 is a preset threshold value V1; wherein V11 is greater than V12, V21 is greater than V22, V13 is less than V12, V23 is less than V22, V2 is greater than V1, and V3 is less than V2.
2. 2. The dual-channel independent automatic battery load identification buck-boost circuit according to claim 1, wherein V11 and V21 are 4.2 volts, V12 and V22 are 4.05 volts, V13 and V23 are 2.9 volts, V1 is 0.1 volts, V2 is 1 volt, and V3 is 0.2 volts.
3. 3. The dual-channel independent automatic battery load identification buck-boost circuit according to claim 1, wherein the input high voltage isolation module comprises an NMOS isolation tube, a power regulator and a charge pump, wherein a drain electrode of the NMOS isolation tube is connected to the port VIN, a source electrode of the NMOS isolation tube is connected to a port PMID, a gate electrode of the NMOS isolation tube is connected to an output of the charge pump, an input of the power regulator is connected to the port VIN, and an output of the power regulator is supplied to the charge pump as a power supply.
4. 4. The dual channel independent automatic identification battery load boost-buck circuit of claim 1, wherein the input high voltage isolation module comprises a power regulator, a gate clamp zener diode, a PMOS isolation tube, a first substrate switching diode and a second substrate switching diode, wherein the source of the PMOS isolation tube is connected to port VIN, the drain of the PMOS isolation tube is connected to port PMID, the gate of the PMOS isolation tube is connected to the output node ENB of the power regulator, the input of the power regulator is connected to port VIN, the output of the power regulator is connected to the output node ENB, the anode of the gate clamp zener diode is connected to the output node ENB, the cathode of the gate clamp zener diode is connected to the source of the PMOS isolation tube, the anode of the first substrate switching diode is connected to port VIN, the cathode of the first substrate switching diode is connected to the substrate of the PMOS isolation tube, and the anode of the second substrate switching diode is connected to the drain of the PMOS isolation tube.
5. 5. The dual-channel independent automatic identification battery load step-up and step-down circuit according to claim 1, wherein the step-up and step-down voltage control module comprises a PMOS tube, an NMOS tube, a mode selector, a substrate selector and a step-up and step-down voltage controller, wherein a source electrode of the PMOS tube is connected to the input high-voltage isolation module, a drain electrode of the PMOS tube is connected to LX, a grid electrode of the NMOS tube is connected to a VPG output end of the step-up and step-down controller, a source electrode of the NMOS tube is connected to ground, a drain electrode of the NMOS tube is connected to LX, a grid electrode of the NMOS tube is connected to a VNG output end of the step-up and step-down controller, and an input of the mode selector is connected to a port VIN, and an output end of the NMOS tube is connected to an input end VMOD of the step-up and step-down controller.
6. 6. The dual-channel independent automatic battery load identification buck-boost circuit according to claim 1, further comprising an input capacitor and a battery bypass capacitor, wherein the input capacitor is connected between the port VIN and the ground GND, and the battery bypass capacitor is connected between the positive electrode of the rechargeable battery and the ground GND.
7. 7. The dual-channel independent automatic battery load identification buck-boost circuit according to claim 1, further comprising a first output capacitor and a second output capacitor, wherein the first output capacitor is connected between the first battery load and the ground GND, and the second output capacitor is connected between the second battery load and the ground GND.

Description

Dual-channel independent automatic battery load identification step-up and step-down circuit Technical Field The invention belongs to the technical field of power supply circuit design, and relates to a dual-channel voltage increasing and decreasing circuit capable of independently and automatically identifying battery load. Background With the continuous development of integrated circuit technology, the buck-boost direct current conversion power supply management products are widely developed and applied, high-efficiency direct current to direct current power supply conversion is realized, and the buck-boost direct current conversion power supply management products can be applied to the use environments and occasions of various electronic products. Referring to fig. 1, fig. 1 is a schematic diagram illustrating connection of a buck-boost dc conversion circuit in the prior art. As shown in fig. 1, the control chip 212 has 5 ports VIN, LX, BAT, VOUT1 and GND. The positive electrode of the input capacitor 102 and the USB power supply port USB port are connected with the port VIN, the negative electrode of the input capacitor 102 is grounded, the energy storage inductor 104 is connected between the port LX and the port BAT, the battery bypass capacitor 105 is connected between the port BAT and the ground GND, the positive electrode of the rechargeable battery 106 is connected between the port BAT and the ground GND, and the port output capacitor 107 and the battery load 108 are connected between the port VOUT1 and the ground GND in parallel. It will be clear to those skilled in the art that in the above-described circuit, the dc conversion mode, for example, the buck or boost dc conversion mode, can be determined by the voltage value at the port VIN. Specifically, when the voltage value of the port VIN is determined by the port MODE module 401 to select the power conversion MODE, the following cases may be classified: ① When VIN is more than or equal to 4.7V, the port VIN, the switch PMOS tube 404, the freewheel NMOS tube 405 and the inductor 104 form a synchronous voltage reduction framework, the battery 106 is charged in a switch mode, and meanwhile, the battery load of the port VOUT is supplied with power supply energy; ② Synchronous voltage reduction does not work when VIN is more than or equal to 4.5 and less than 4.7V, and the port VIN only provides power supply energy for a battery load; ③ When VIN is less than 4.5V, the switch NMOS tube 405, the freewheel PMOS tube 404, and the energy storage inductor 104 form a synchronous boost architecture, and the battery 106 discharges to provide power energy to the battery load 108; ④ When VIN port floats, the battery load 108 connected to the port VOUT charges the battery load 108 by the synchronous boost formed by the control chip 212 and the energy storage inductor 104. From the operation principle of the above circuit, it can be seen that when the VIN port floats, if the battery load 108 is charged, it cannot be monitored whether the battery load 108 is full, and even if the battery load 108 is full, the synchronous boost is still in an operating state. Disclosure of Invention In order to solve the technical problems, the invention provides a dual-channel independent automatic identification battery load voltage increasing and decreasing circuit, which has the following technical scheme: A dual-channel independent automatic battery load identification buck-boost circuit comprises a buck-boost control chip, an energy storage inductor, a rechargeable battery, a first battery load and a second battery load; the buck-boost control chip is characterized by comprising a buck-boost control module, a load detection module, a boost bypass capacitor, a first detection resistor, a second detection resistor, a power supply port VIN, an inductance port LX, a charging port BAT, a buck-boost port PMID, an output port VOUT1, an output port VOUT2, a first detection port VEND1, a second detection port VEND2 and a ground end GND, wherein the port VIN receives the voltage of a power supply, the energy storage inductance is connected between the port LX and the port BAT, the positive electrode of the rechargeable battery is connected to the port BAT, the negative electrode of the rechargeable battery is connected to the ground end GND, the first battery load is connected between the output port VOUT 1and the ground end GND, the second battery load is connected between the output port VOUT2 and the ground end GND, the boost bypass capacitor is connected between the buck-boost port PMID and the ground end GND, the first detection resistor is connected between the first detection port VEND 1and the ground end GND, the second detection resistor is connected between the second detection port LX and the ground end BAT, the positive electrode of the rechargeable battery is connected to the port BAT, the negative electrode of the rechargeable battery is connected to the ground end GND 1