CN207368644U

CN207368644U - Multiple protective circuit

Info

Publication number: CN207368644U
Application number: CN201721289534.6U
Authority: CN
Inventors: 毛立文; 李武歧
Original assignee: Sunwoda Electronic Co Ltd
Current assignee: Sunwoda Electronic Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2018-05-15
Anticipated expiration: 2027-09-30

Abstract

The utility model discloses a kind of multiple protective circuit, including the first metal-oxide-semiconductor component, the second metal-oxide-semiconductor component, thermal resistor and the second protection IC；One end of the first metal-oxide-semiconductor component connects the battery cathode, the negative charging end of other end connection, one end of the second metal-oxide-semiconductor component connects the anode, the other end connects positive charging end, the second metal-oxide-semiconductor component includes the first NMOS tube and the second NMOS tube, the second protection IC connects the anode respectively, the G poles of first NMOS tube and the G poles of the second NMOS tube, the S poles of first NMOS tube connect the anode, the D poles of first NMOS tube connect the D poles of second NMOS tube, the S poles of second metal-oxide-semiconductor connect the positive charging end；Described thermal resistor one end connection the second protection IC, the other end connect the battery cathode, the utility model have the function of over-charging of battery, mistake put, overcurrent, overheat and short-circuit protection.

Description

Multiple protective circuit

Technical field

It the utility model is related to battery protection field, and in particular to a kind of multiple protective circuit.

Background technology

As consumer is higher and higher to the usage degree of battery, especially use of the mobile phone to battery, pursues battery and holds Amount is big, charging current is big and the charging interval is short, adds security risk, and use the battery power consumption on mobile phone It hurry up, be easy to causeing to put makes cell damage, so battery is badly in need of a kind of protection circuit with multiple protective when in use.

Utility model content

The main purpose of the utility model has over-charging of battery, puts excessively, overcurrent, mistake to provide a kind of multiple protective circuit The function of heat and short-circuit protection.

The utility model proposes a kind of multiple protective circuit, including the first metal-oxide-semiconductor component, the second metal-oxide-semiconductor component, temperature-sensitive electricity Hinder device and the second protection IC；

One end of the first metal-oxide-semiconductor component connects the battery cathode, the negative charging end of other end connection, in anode The circuit of end cut-out battery；

One end of the second metal-oxide-semiconductor component connects the anode, and the other end connects positive charging end, in cathode The circuit of end cut-out battery；

The second metal-oxide-semiconductor component includes the first NMOS tube and the second NMOS tube, and the second protection IC connects institute respectively Anode, the G poles and the G poles of the second NMOS tube of the first NMOS tube are stated, the S poles of first NMOS tube are connecting the battery just Pole, the D poles of first NMOS tube connect the D poles of second NMOS tube, and the S poles connection of second metal-oxide-semiconductor is described just to fill Electric end；

Thermal resistor one end connection the second protection IC, the other end connects the battery cathode, for detecting Battery temperature；

The second protection IC is used to control first NMOS tube to be not turned on the second NMOS tube, first NMOS tube The charge circuit of the battery is cut off when being not turned on, and the discharge loop of the battery is cut when second NMOS tube is not turned on It is disconnected.

Further, the second protection IC includes BAT ends, vdd terminal, VSS ends, CS ends, CHG ends, DSG ends, PACK ends With CTR ends, the BAT ends of the second protection IC are connected the anode, the CHG of the second protection IC with vdd terminal respectively End connects the G poles of first NMOS tube, and the DSG ends of the second protection IC connect the G poles of second NMOS tube, and described the The PACK ends of two protection IC connect the S poles of second NMOS tube, and the VSS ends of the second protection IC are connected institute respectively with CS ends Battery cathode is stated, the CTR ends of the second protection IC connect one end of the thermal resistor.

Further, detection resistance R6 is further included, one end of detection resistance R6 connects the CS of the second protection IC respectively End and thermal resistor, the other end connect VSS ends and the battery cathode of the second protection IC, the thermal resistor respectively The battery cathode is connected by the detection resistance R6 with the CS ends of the second protection IC, the detection resistance R6 is examined for overcurrent Survey and short-circuit detecting.

Further, multiple protective circuit further includes the first protection IC, the first protection IC include VCC ends, VSS ends, CS ends, DO ends, CO ends and VM ends, the first metal-oxide-semiconductor component include the 3rd NMOS tube and the 4th NMOS tube；

The S poles of 3rd NMOS tube connect the anode of the battery, the G poles connection described first of the 3rd NMOS tube The DO ends of IC are protected, the D poles of the 3rd NMOS tube connect the D poles of the 4th NMOS tube, and the G poles of the 4th NMOS tube connect Connect the CO ends of the first protection IC, the negative charging end of S poles connection of the 4th NMOS tube, the VCC ends of the first protection IC The cathode of the battery is connected, the VSS ends of the first protection IC are connected the anode of the battery, first protection with CS ends The VM ends of IC connect the S poles of the 4th NMOS tube；

The first protection IC is used to control the 3rd NMOS tube to be not turned on the 4th NMOS tube, the 3rd NMOS tube The discharge loop of the battery is cut off when being not turned on, and the charge circuit of the battery is cut when the 4th NMOS tube is not turned on It is disconnected.

Further, multiple protective circuit further includes the first capacitance C1, the second capacitance C2, the 3rd capacitance C3 and the 4th capacitance C4；

One end of the first capacitance C1 connects the VCC ends of the anode and the first protection IC, the first capacitance C1's The other end connects the battery cathode and the VSS ends of the first protection IC, and the first capacitance C1 passes through the detection resistance R6 Connect the battery cathode；

One end of the second capacitance C2 connects the positive charging end, other end connection the 3rd electricity of the second capacitance C2 Hold one end of C3, the other end of the 3rd capacitance C3 connects the negative charging end；

One end of the 4th capacitance C4 connects the battery cathode, and the other end of the 4th capacitance C4 connects the electricity The vdd terminal of pond cathode and the described second protection IC.

Further, multiple protective circuit further includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5；

The VCC ends of the first protection IC are connected the anode with the first capacitance C1 by the first resistor R1；

The S poles that the VM ends of the first protection IC pass through second resistance R2 connections the 4th NMOS tube；

The S poles of 3rd NMOS tube are connected the battery with the CS ends of the first protection IC by the 3rd resistor R3 Anode；

The BAT ends of the second protection IC pass through the 4th resistance R4 connections anode；

The 4th capacitance C4 is connected the anode with the vdd terminal of the second protection IC by the 5th resistance R5.

The beneficial effects of the utility model：First metal-oxide-semiconductor component is arranged on battery cathode end, overcharge when battery or Cross when putting, cell circuit can be cut off at battery cathode end, the second metal-oxide-semiconductor component be arranged on the positive terminal of battery, when battery occurs When overcharging or putting excessively, the second protection IC can pass through the second metal-oxide-semiconductor component in positive terminal and cut off cell circuit, the first metal-oxide-semiconductor group Part and the second metal-oxide-semiconductor component are respectively placed in positive terminal and negative pole end, it is not necessary to and set and stagger in protection difference, easy to type selecting, It is more easy to meet to apply at the same time and the requirement of certification, security higher, and either the first metal-oxide-semiconductor component or the second metal-oxide-semiconductor group Part first acts, and does not affect another work, greatly reduces the possibility of cell damage and occurrence risk.

Second protection IC detects the temperature of battery, when battery temperature exceedes preset temperature, second by thermal resistor Protection IC can control the second metal-oxide-semiconductor component to cut off cell circuit, battery is realized overtemperature protection；Second protection IC passes through detection The pressure drop of resistance R6 detects whether cell circuit overcurrent and short circuit occurs, when there is overcurrent and short circuit phenomenon, second Protection IC can control the second metal-oxide-semiconductor component to cut off cell circuit in time.

Second protection IC detect overcharge, cross put, overcurrent, overheat and during short circuit phenomenon, first can be controlled in time NMOS tube and the second NMOS tube cut-out cell circuit, ensure that the first NMOS tube and the voltage of the VGS of the second NMOS tube are maintained at one A rational value, does not change with the voltage change of battery, reduces the first NMOS tube and changes with the second NMOS tube internal resistance, reduces the One NMOS tube is generated heat with the second NMOS tube.

Brief description of the drawings

Fig. 1 is a kind of multiple protective circuit schematic diagram of one embodiment of the utility model.

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

Embodiment

The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise Lower all other embodiments obtained, shall fall within the protection scope of the present invention.

It is to be appreciated that in the utility model such as relating to the description of " first ", " second " etc. be only used for description purpose, without It is understood that to indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define At least one this feature can be expressed or be implicitly included to the feature of " first ", " second ".In addition, between each embodiment Technical solution can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, work as technical solution Combination there is conflicting or can not realize when and will be understood that the combination of this technical solution is not present, also not in this practicality newly Within the protection domain of type requirement.

Referring to Fig. 1, a kind of multiple protective circuit of one embodiment of the utility model, including the first metal-oxide-semiconductor component, second are proposed Metal-oxide-semiconductor component, thermal resistor (PTC) and the second protection IC (U2)；One end connection battery (CELL) of first metal-oxide-semiconductor component is negative Pole, other end connection is negative charging end (PACK-), in the circuit of negative pole end cut-out battery；One end of second metal-oxide-semiconductor component connects Battery (CELL) cathode is connect, the other end connects positive charging end (PACK⁺), in the circuit of positive terminal cut-out battery；2nd MOS Tube assembly includes the second metal-oxide-semiconductor component, and the second metal-oxide-semiconductor component includes the first NMOS tube (Q1) and the second NMOS tube (Q2), and second IC (U2) is protected to connect anode, the G poles and the G poles of the second NMOS tube (Q2) of the first NMOS tube (Q1), the first NMOS respectively The S poles connection anode of pipe, the D poles of the first NMOS tube (Q1) connect the D poles of the second NMOS tube (Q2), the second metal-oxide-semiconductor (Q2) S poles connect positive charging end (PACK⁺)；The second protection IC (U2) of thermal resistor (PTC) one end connection, other end connection battery Anode, for detecting battery temperature；Second protect IC (U2) be used for control the first NMOS tube (Q1) and the second NMOS tube (Q2) no Conducting, the charge circuit of battery is cut off when the first NMOS tube (Q1) is not turned on, battery when the second NMOS tube (Q2) is not turned on Discharge loop is cut off.Specifically, the second protection IC includes BAT ends, vdd terminal, VSS ends, CS ends, CHG ends, DSG ends, PACK ends With CTR ends, BAT ends and the vdd terminal of the second protection IC are connected anode, the CHG ends connection first of the second protection IC respectively The G poles of NMOS tube, the DSG ends of the second protection IC connect the G poles of the second NMOS tube, the PACK ends connection second of the second protection IC The S poles of NMOS tube, VSS ends and the CS ends of the second protection IC are connected battery cathode, the CTR ends connection temperature-sensitive of the second protection IC respectively One end of resistor.

In the present embodiment, the first metal-oxide-semiconductor component is arranged on battery cathode end, can when battery, which is overcharged or crossed, to be put Cell circuit is cut off at battery cathode end, the second metal-oxide-semiconductor component is arranged on the positive terminal of battery, when battery overcharges or mistake When putting, the second protection IC can cut off cell circuit, the first metal-oxide-semiconductor component and the 2nd MOS in positive terminal by the second metal-oxide-semiconductor component Tube assembly is respectively placed in positive terminal and negative pole end, it is not necessary to sets and staggers in protection difference, easy to type selecting, is more easy to meet at the same time Using and certification requirement, security higher, and either the first metal-oxide-semiconductor component or the second metal-oxide-semiconductor component first act, not Another work is influenced, greatly reduces the possibility of cell damage and occurrence risk.Second protection IC passes through thermal resistor The temperature of battery is detected, when battery temperature exceedes preset temperature, the second protection IC can control the second metal-oxide-semiconductor component cut-out electricity Pond circuit, makes battery realize overtemperature protection；Second protection IC detect overcharge, cross put, overcurrent, overheat and short circuit phenomenon When, the first NMOS tube can be controlled to cut off cell circuit with the second NMOS tube in time, ensure the first NMOS tube and the second NMOS tube The voltage of VGS be maintained at a rational value, do not change with the voltage change of battery, reduce the first NMOS tube and second NMOS tube internal resistance changes, and reduces by the first NMOS tube and generates heat with the second NMOS tube.

In the present embodiment, anode is only to refer to cathode on battery；Described positive terminal refers to anode to positive charging Circuit between end；Battery cathode is only to refer to anode on battery；Described negative pole end refers to battery cathode between negative charging end Circuit.

In one embodiment of the utility model, multiple protective circuit further includes detection resistance R6, one end point of detection resistance R6 Not Lian Jie second protection IC CS ends and thermal resistor, the VSS ends that the other end connects the second protection IC respectively born with battery Pole, thermal resistor are connected battery cathode with the CS ends of the second protection IC by detection resistance R6, and detection resistance R6 is used for overcurrent Detection and short-circuit detecting.Second protection IC pass through the pressure drop of detection resistance R6 come detect cell circuit whether occur overcurrent and Short circuit, when there is overcurrent and short circuit phenomenon, the second protection IC can control the second metal-oxide-semiconductor component cut-out battery to return in time Road.

In one embodiment of the utility model, multiple protective circuit further includes the first protection IC (U1), the first protection IC (U1) Including VCC ends, VSS ends, CS ends, DO ends, CO ends and VM ends, the first metal-oxide-semiconductor component includes the 3rd NMOS tube (Q3) and the 4th NMOS tube (Q4)；The anode of the S poles connection battery of 3rd NMOS tube (Q3), the first protection of G poles connection of the 3rd NMOS tube (Q3) The DO ends of IC (U1), the D poles of the 3rd NMOS tube (Q3) connect the D poles of the 4th NMOS tube (Q4), and the G poles of the 4th NMOS tube (Q4) connect Connect the CO ends of the first protection IC (U1), the negative charging end of S poles connection of the 4th NMOS tube, the VCC ends connection of the first protection IC (U1) The cathode of battery, the VSS ends of the first protection IC (U1) are connected the anode of battery, the VM ends connection of the first protection IC (U1) with CS ends The S poles of 4th NMOS tube (Q4)；When there is overvoltage or cross put when, the first protection IC (U1) controls the 3rd NMOS tube (Q3) and the Four NMOS tubes (Q4) are not turned on, and the discharge loop of battery is cut off when the 3rd NMOS tube (Q3) is not turned on, the 4th NMOS tube (Q4) The charge circuit of battery is cut off when being not turned on.

In one embodiment of the utility model, the first capacitance C1 for ensureing multiple protective circuit steady operation, second are further included Capacitance C2, the 3rd capacitance C3 and the 4th capacitance C4；The VCC of one end connection anode of first capacitance C1 and the first protection IC End, the other end connection battery cathode of the first capacitance C1 and the VSS ends of the first protection IC, and the first capacitance C1 passes through detection resistance R6 connection battery cathode；One end of second capacitance C2 connects positive charging end, and the other end of the second capacitance C2 connects the 3rd capacitance C3 One end, the negative charging end of other end connection of the 3rd capacitance C3；One end connection battery cathode of 4th capacitance C4, other end connection The vdd terminal of anode and the second protection IC.

In one embodiment of the utility model, the first resistor for being further ensured that multiple protective circuit steady operation is further included R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5；The VCC ends of first protection IC and the first capacitance C1 Pass through first resistor R1 connection anodes；The S poles that the VM ends of first protection IC pass through the 4th NMOS tube of second resistance R2 connections； The S poles of 3rd NMOS tube are connected the anode of battery with the CS ends of the first protection IC by 3rd resistor R3；The BAT of second protection IC End passes through the 4th resistance R4 connection anodes；4th capacitance C4 is connected with the vdd terminal of the second protection IC by the 5th resistance R5 The anode.

The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention, Every equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is directly or indirectly transported Used in other related technical areas, it is equally included in the patent within the scope of the utility model.

Claims

1. a kind of multiple protective circuit, it is characterised in that including the first metal-oxide-semiconductor component, the second metal-oxide-semiconductor component, thermal resistor With the second protection IC；

One end connection battery cathode of the first metal-oxide-semiconductor component, the negative charging end of other end connection, for cutting off electricity in negative pole end The circuit in pond；

One end of the second metal-oxide-semiconductor component connects the anode, and the other end connects positive charging end, for being cut in positive terminal Power off the circuit in pond；

The second metal-oxide-semiconductor component includes the first NMOS tube and the second NMOS tube, and the second protection IC connects the electricity respectively The G poles and the G poles of the second NMOS tube of pond cathode, the first NMOS tube, the S poles of first NMOS tube connect the anode, The D poles of first NMOS tube connect the D poles of second NMOS tube, the S poles connection positive charging of second metal-oxide-semiconductor End；

The second protection IC is used to control first NMOS tube to be not turned on the second NMOS tube, and first NMOS tube is not led The charge circuit of the battery is cut off when logical, and the discharge loop of the battery is cut off when second NMOS tube is not turned on.

2. multiple protective circuit as claimed in claim 1, it is characterised in that it is described second protection IC include BAT ends, vdd terminal, VSS ends, CS ends, CHG ends, DSG ends, PACK ends and CTR ends, it is described second protection IC BAT ends be connected respectively with vdd terminal described in Anode, the CHG ends of the second protection IC connect the G poles of first NMOS tube, and the DSG ends of the second protection IC connect Connecing the G poles of second NMOS tube, the PACK ends of the second protection IC connect the S poles of second NMOS tube, and described second The VSS ends of IC and CS ends is protected to be connected the battery cathode respectively, the CTR ends of the second protection IC connect the thermistor One end of device.

3. multiple protective circuit as claimed in claim 2, it is characterised in that detection resistance R6 is further included, detection resistance R6's One end connects CS ends and the thermal resistor of the second protection IC respectively, and the other end connects the second protection IC's respectively VSS ends and battery cathode, the thermal resistor are connected the electricity with the CS ends of the second protection IC by the detection resistance R6 Pond anode, the detection resistance R6 are used for over-current detection and short-circuit detecting.

4. multiple protective circuit as claimed in claim 3, it is characterised in that further include the first protection IC, first protection IC includes VCC ends, VSS ends, CS ends, DO ends, CO ends and VM ends, and the first metal-oxide-semiconductor component includes the 3rd NMOS tube and the 4th NMOS tube；

The S poles of 3rd NMOS tube connect the anode of the battery, G poles connection first protection of the 3rd NMOS tube The DO ends of IC, the D poles of the 3rd NMOS tube connect the D poles of the 4th NMOS tube, the G poles connection institute of the 4th NMOS tube State the CO ends of the first protection IC, the negative charging end of S poles connection of the 4th NMOS tube, the VCC ends connection of the first protection IC The cathode of the battery, the VSS ends of the first protection IC are connected the anode of the battery with CS ends, the first protection IC's VM ends connect the S poles of the 4th NMOS tube；

The first protection IC is used to control the 3rd NMOS tube to be not turned on the 4th NMOS tube, and the 3rd NMOS tube is not led The discharge loop of the battery is cut off when logical, and the charge circuit of the battery is cut off when the 4th NMOS tube is not turned on.

5. multiple protective circuit as claimed in claim 4, it is characterised in that further include the first capacitance C1, the second capacitance C2, Three capacitance C3 and the 4th capacitance C4；

One end of the first capacitance C1 connects the VCC ends of the anode and the first protection IC, and the first capacitance C1's is another End connects the battery cathode and the VSS ends of the first protection IC, and the first capacitance C1 passes through the detection resistance R6 connections The battery cathode；

One end of the second capacitance C2 connects the positive charging end, and the other end of the second capacitance C2 connects the 3rd capacitance C3 One end, the other end of the 3rd capacitance C3 connects the negative charging end；

One end of the 4th capacitance C4 connects the battery cathode, the other end of the 4th capacitance C4 connect the anode with The vdd terminal of the second protection IC.

6. multiple protective circuit as claimed in claim 5, it is characterised in that further include first resistor R1, second resistance R2, Three resistance R3, the 4th resistance R4 and the 5th resistance R5；

The S poles of 3rd NMOS tube are connected the negative of the battery with the CS ends of the first protection IC by the 3rd resistor R3 Pole；