CN212784828U

CN212784828U - Battery low temperature activation circuit

Info

Publication number: CN212784828U
Application number: CN202021683209.XU
Authority: CN
Inventors: 陈东东; 陈小军; 黄章良; 鲁星华
Original assignee: Guangzhou Robustel Technologies Co ltd
Current assignee: Guangzhou Lubangtong IoT Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-03-23
Anticipated expiration: 2030-08-13

Abstract

The utility model discloses a battery low temperature activation circuit, including the battery compartment that is used for inserting external power source's power source and is used for the battery installation, still include battery protection chip and opto-coupler, the positive pole and the power source of opto-coupler are connected and the negative pole of opto-coupler is connected with the drain electrode of third MOS pipe, the projecting pole of opto-coupler passes through the fourth resistance and is connected with the negative pole end of battery compartment, the collecting electrode and the ground wire of opto-coupler are connected, the source electrode and the ground wire of third MOS pipe are connected, the grid of third MOS pipe passes through fifth electric capacity and power source and is connected and be connected with the ground wire through fifth resistance to form activation circuit through opto-coupler, third MOS pipe, fifth electric capacity and fifth resistance. Through the utility model discloses can effectively simplify the structure, improve the reliability, reduce cost.

Description

Battery low temperature activation circuit

Technical Field

The utility model belongs to the battery equipment field especially relates to a battery low temperature activation circuit.

Background

Currently, for industrial internet of things type charged battery communication equipment, many products require that the equipment can still work for several hours at full load after power failure under the condition of-20 ℃ so as to provide emergency communication and alarm. There are two approaches to the need for prior art designs. The first method is to design a key with a power switch, and a battery protection chip has no dormancy function, and in the design, after the battery is shut down after the electric quantity of the battery is used up, the power switch key is manually pressed on site once, and the equipment is activated again; the design is suitable for commercial handheld equipment, and if the design is applied to the industrial fields of the Internet of things and the like, the manual maintenance cost is very high. The second method is that no power switch key is provided, the battery protection chip has a sleep function, and after the emergency power supply of the battery is finished, the power is automatically started after being recovered, and manual interference is not needed; the ambient temperature is detected, the battery protection chip is automatically charged and activated at 0-45 ℃ to enable the battery to discharge, but the battery charging and discharging management chip cannot be charged under the negative temperature condition, the dormant state of the battery protection chip cannot be activated, and the battery cannot be discharged. In practical use, the charging temperature range of the battery charging and discharging management chip is 0-45 ℃, the discharging temperature range allowed by the battery is-20 ℃ to 60 ℃, the equipment for delivering goods with the battery has a battery dormancy function, and the battery has certain electric quantity for delivering goods so as to avoid the damage to the battery due to the exhaustion of the electric quantity of the battery during transportation or storage. In order to solve the problem, an external electric heating device is adopted for realizing the purpose, the size is large, the cost is high, the miniaturization of Internet of things products is inconvenient, an external temperature detection circuit is needed, the logic of software and hardware is complex, the reliability of a system is reduced, and the cost is increased; the common structure of the intelligent charging and discharging device is composed of a power switch key, a CPU processor, a battery charging and discharging management chip, a lithium battery, a battery protection chip, an external electric heating device and a temperature detection circuit, and the intelligent charging and discharging device is complex in structure and high in cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery low temperature activation circuit can effectively simplify the structure, improves the reliability, reduce cost.

In order to achieve the purpose, the utility model provides a battery low temperature activation circuit, including the power source interface that is used for inserting external power and the battery compartment that is used for the battery installation, still include battery protection chip and opto-coupler, the positive power input end of battery protection chip passes through second resistance and is connected with the positive terminal of battery compartment and still is connected with the negative pole end of battery compartment through fourth electric capacity and thereby forms battery voltage detection circuit, the negative power input end of battery protection chip is connected with the negative pole end of battery compartment; the charging control connecting end of the battery protection chip is connected with the grid electrode of the first MOS tube, the discharging control connecting end of the battery protection chip is connected with the grid electrode of the second MOS tube, the source electrode of the first MOS tube is connected with the ground wire, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the negative electrode end of the battery bin to form a battery electricity control circuit; the detection end of the battery protection chip is connected with the ground wire through a first resistor to form a differential pressure signal between the ground wire and the negative electrode of the battery and a current magnitude and direction monitoring circuit; the positive pole and the power interface of opto-coupler are connected and the negative pole of opto-coupler is connected with the drain electrode of third MOS pipe, the projecting pole of opto-coupler passes through the fourth resistance and is connected with the negative pole end of battery compartment, the collecting electrode and the ground wire of opto-coupler are connected, the source electrode and the ground wire of third MOS pipe are connected, the grid of third MOS pipe passes through fifth electric capacity and power interface connection and is connected with the ground wire through fifth electric capacity to form activation circuit through opto-coupler, third MOS pipe, fifth electric capacity and fifth resistance.

Preferably, the positive terminal of the battery compartment is connected with the ground wire through the first capacitor, the second capacitor and the third capacitor to form an electric power storage and filter circuit.

Preferably, the first capacitance is 0.5-1.5nF, the second capacitance is 8-12uF, and the third capacitance is 90-110 nF.

Preferably, the fifth capacitor is 8-12uF, and the fifth resistor is 9-12K omega.

Preferably, the fourth capacitance is 90-110nF, and the second resistance is 280-320 omega.

Preferably, the anode of the optical coupler is connected with the power interface through a third resistor, and the third resistor is 150-220 Ω.

Preferably, the first resistance is 550-.

Preferably, the power interface is connected with an adapter outputting direct current 5V.

Compared with the prior art, the utility model, its beneficial effect lies in:

the utility model can effectively activate the battery protection chip through the matching of the detection circuit and the activation circuit, simplify the structure, improve the reliability and reduce the cost; the battery can be directly activated by receiving the mains supply, so that the battery has low-temperature discharge capacity, the charging needs to be carried out under the condition of 0-45 ℃, any external electric heating device is not needed, the battery has the advantages of small volume, low cost and high reliability, the power supply can be realized for a plurality of hours at a time under the low-temperature condition, the emergency communication guarantee and the alarm capacity are guaranteed, and the data uploading system for power failure, fault and the like is guaranteed to be completed in time, so that the remote management is facilitated.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

Detailed Description

The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

As shown in fig. 1, the utility model provides a battery low temperature activation circuit, including power source VDD who is used for inserting external power source and the battery compartment J1 that is used for the battery installation, still include battery protection chip U1 and opto-coupler U2, the positive power input of battery protection chip U1 is connected with the positive terminal of battery compartment J1 through second resistance R2 and still is connected with the negative pole end of battery compartment J1 through fourth electric capacity C4 thereby forms battery voltage detection circuit, the negative power input of battery protection chip U1 is connected with the negative pole end of battery compartment J1; the charging control connection end of the battery protection chip U1 is connected with the grid electrode of the first MOS tube Q1, the discharging control connection end of the battery protection chip U1 is connected with the grid electrode of the second MOS tube Q2, the source electrode of the first MOS tube Q1 is connected with the ground wire, the drain electrode of the first MOS tube Q1 is connected with the drain electrode of the second MOS tube Q2, and the source electrode of the second MOS tube Q2 is connected with the negative electrode end of the battery bin J1, so that a battery power control circuit is formed; the detection end of the battery protection chip U1 is connected with the ground wire through a first resistor R1 to form a differential pressure signal between the ground wire and the negative electrode of the battery and a current magnitude and direction monitoring circuit; an anode of the optical coupler U2 is connected with a power interface VDD and a cathode of the optical coupler U2 is connected with a drain of a third MOS tube Q3, an emitter of the optical coupler U2 is connected with a negative end of the battery bin J1 through a fourth resistor R4, a collector of the optical coupler U2 is connected with a ground wire, a source of the third MOS tube Q3 is connected with the ground wire, a grid of the third MOS tube Q3 is connected with the power interface VDD through a fifth capacitor C5 and connected with the ground wire through a fifth resistor R5, and therefore an activation circuit is formed through the optical coupler U2, the third MOS tube Q3, the fifth capacitor C5 and the fifth resistor R5. The positive terminal of the battery box J1 is connected with the ground wire through a first capacitor C1, a second capacitor C2 and a third capacitor C3 respectively to form an electric storage and filter circuit. The power interface VDD is connected to an adapter that outputs dc 5V.

The first capacitance C1 is 1nF, the second capacitance C2 is 10uF, and the third capacitance C3 is 100 nF. The fifth capacitor C5 is 10uF, and the fifth resistor R5 is 10K Ω. The fourth capacitor C4 is 100nF and the second resistor R2 is 300 Ω. The anode of the optical coupler U2 is connected to the power source interface VDD through a third resistor R3, and the third resistor R3 is 200 Ω. The first resistor R1 is 600 Ω. In addition, the first capacitance C1 may also be 0.5nF or 1.5nF, the second capacitance C2 may also be 8uF or 12uF, and the third capacitance C3 may also be 90nF or 110 nF. The fifth capacitor C5 may also be 8uF or 12uF, and the fifth resistor R5 may also be 9K Ω or 11K Ω or 12K Ω. The fourth capacitor C4 may also be 90nF or 110nF, and the second resistor R2 may also be 280 Ω or 290 Ω or 310 Ω or 320 Ω. The third resistor R3 may also be 150 Ω or 180 Ω or 220 Ω. The first resistor R1 may also be 550 Ω or 580 Ω or 620 Ω or 650 Ω.

In this embodiment, the battery protection chip U1 uses S-8261DAM-M6T 1U; the optocoupler U2 uses toshiba TLP 291. The first MOS transistor Q1, the second MOS transistor Q2 and the third MOS transistor Q3 are all N-MOS transistors. The battery bin J1 can be detachably provided with a 3.7V/2000mAh lithium battery, and in addition, a required battery pack can be selected according to requirements. The fifth capacitor C5 and the fifth resistor R5 form an RC charging circuit for supplying power, and the adapter provides direct current 5V voltage by being connected with commercial power. The detection end of the battery protection chip U1 monitors the voltage difference between the signal ground and the negative electrode of the battery, and the magnitude and direction of the current flowing through the first MOS transistor Q1 and the second MOS transistor Q2. If the battery voltage detection circuit detects that the battery power reaches 3V, the battery is indicated to be discharged completely, and the battery protection chip U1 controls to close the second MOS tube Q2, forbids the battery to continue discharging and enters a dormant state.

In this embodiment, when the battery is used, before the battery is powered on for the first time or when the battery is discharged to a voltage of 3V, the battery protection chip U1 is in a sleep state, and the first MOS transistor Q1 and the second MOS transistor Q2 are controlled to be turned off, so that the negative electrode of the battery is disconnected, and the battery does not supply power to the device. After the adapter is connected with a mains supply to power on the equipment, and a direct current 5V power supply of a power interface VDD is stabilized, the equipment is charged by using an RC charging circuit formed by a fifth capacitor C5 and a fifth resistor R5, wherein the charging time is 200ms, so that a third MOS transistor Q3 is realized. After the third MOS transistor Q3 is switched on, the anode and the cathode of the optical coupler U2 are switched on and current is limited through a third resistor R3, the limit value of the current value is 16mA, so that the emitter and the collector of the optical coupler U2 are switched on, the coupling ratio of the optical coupler U2 is 100% -400%, the conduction current of the emitter and the collector of the U2 is at least 16mA, and the conduction time is at least 200 ms. After an emitter and a collector of the optocoupler U2 are conducted, a cathode end of the battery bin J1 is conducted with a signal ground network, the dormancy releasing condition of the battery protection chip U1 is met, and the voltage difference between the detection end of the battery protection chip U1 and the negative power supply input end is smaller than 0.7V or negative voltage, so that the battery protection chip U1 controls to open the second MOS tube Q2, controls to utilize a body diode of the first MOS tube Q1, activates a battery discharging path, activates the battery to discharge, and the whole discharging path can realize the discharging current capacity of 3A. Therefore, no matter whether the environmental temperature monitored by the battery protection chip U1 is negative or not, and whether the battery is charged or not, the discharging path of the equipment under the low-temperature condition is smooth, and the power failure can provide emergency communication guarantee and data uploading such as faults for the equipment, so that the full-function standby time is realized for several hours, the structure is effectively simplified, the reliability is improved, and the cost is reduced.

The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the invention as expressed in the above teachings or as known to the person skilled in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A low-temperature battery activation circuit, which comprises a power interface (VDD) for accessing an external power supply and a battery compartment (J1) for installing a battery, and is characterized by further comprising a battery protection chip (U1) and an optical coupler (U2), wherein a positive power supply input end of the battery protection chip (U1) is connected with a positive terminal of the battery compartment (J1) through a second resistor (R2) and is also connected with a negative terminal of the battery compartment (J1) through a fourth capacitor (C4) so as to form a battery voltage detection circuit, and a negative power supply input end of the battery protection chip (U1) is connected with a negative terminal of the battery compartment (J1); the connection end for charge control of the battery protection chip (U1) is connected with the grid electrode of a first MOS tube (Q1), the connection end for discharge control of the battery protection chip (U1) is connected with the grid electrode of a second MOS tube (Q2), the source electrode of the first MOS tube (Q1) is connected with the ground wire, the drain electrode of the first MOS tube (Q1) is connected with the drain electrode of a second MOS tube (Q2), and the source electrode of the second MOS tube (Q2) is connected with the negative electrode end of a battery bin (J1), so that a battery electric control circuit is formed; the detection end of the battery protection chip (U1) is connected with the ground wire through a first resistor (R1) to form a differential pressure signal between the ground wire and the negative electrode of the battery and a current magnitude and direction monitoring circuit; the positive pole of opto-coupler (U2) is connected with power source interface (VDD) and the negative pole of opto-coupler (U2) is connected with the drain-source resistance of third MOS pipe (Q3), the emitter of opto-coupler (U2) is connected with the negative pole end of battery compartment (J1) through fourth resistance (R4), the collector and the ground connection of opto-coupler (U2), the source and the ground connection of third MOS pipe (Q3), the grid of third MOS pipe (Q3) passes through fifth electric capacity (C5) and is connected with power source interface (VDD) and is connected with the ground through fifth resistance (R5) to form the activation circuit through opto-coupler (U2), third MOS pipe (Q3), fifth electric capacity (C5) and fifth resistance (R5).

2. The battery low-temperature activation circuit as claimed in claim 1, wherein the positive terminal of the battery compartment (J1) is connected to ground via a first capacitor (C1), a second capacitor (C2) and a third capacitor (C3) to form a power storage and filter circuit.

3. A battery cold-activation circuit according to claim 2, wherein said first capacitor (C1) is 0.5-1.5nF, said second capacitor (C2) is 8-12uF and said third capacitor (C3) is 90-110 nF.

4. The battery low-temperature activation circuit as claimed in claim 1, wherein the fifth capacitor (C5) is 8-12uF, and the fifth resistor (R5) is 9-12K Ω.

5. The battery low-temperature activation circuit as claimed in claim 1, wherein the fourth capacitor (C4) is 90-110nF, and the second resistor (R2) is 280-320 Ω.

6. The battery low-temperature activation circuit as claimed in claim 1, wherein the anode of the optocoupler (U2) is connected to the power source interface (VDD) through a third resistor (R3), and the third resistor (R3) is 150 Ω -220 Ω.

7. The battery low-temperature activation circuit as claimed in claim 1, wherein the first resistor (R1) is 550 Ω 650 Ω.

8. A battery cold-activation circuit according to claim 1, wherein the power supply interface (VDD) is connected to an adapter outputting dc 5V.