CN209134077U - A kind of battery charge controller, charger and electric tool - Google Patents

Abstract

The utility model embodiment is related to charger technologies field, discloses a kind of battery charge controller, charger and electric tool.Wherein, which is used to charge for battery pack, comprising: conversion circuit, conversion control circuit, the first driving circuit, the second driving circuit, protection circuit and controller；Protecting circuit includes the first protection branch；Conversion circuit is separately connected the first driving circuit and controller; second driving circuit is connect with the first driving circuit; conversion control circuit is connect with conversion circuit, and controller is separately connected conversion control circuit, the second driving circuit, and the first protection branch is separately connected controller, conversion control circuit.In the above manner, the present embodiment can protect battery charge controller, to improve security reliability.

Description

A kind of battery charge controller, charger and electric tool

Technical field

The utility model relates to charger technologies fields, and in particular to a kind of battery charge controller, charger and electronic work Tool.

Background technique

With the development of the society, portable power tool is in our life using more and more extensive.Electric tool one As include three-piece, respectively complete machine, battery pack and charger, after charger is battery pack charging, battery pack is that complete machine is powered, To which complete machine can operate.

Inventor has found that the charger of current electric tool is easy quilt during realizing the utility model embodiment Breakdown, security reliability are lower.

Utility model content

In order to solve the above technical problems, the utility model aim is to provide a kind of battery charge controller, charger and electricity Power driven tools can protect battery charge controller, to improve security reliability.

To achieve the goals above, the utility model embodiment discloses following technical solution:

The utility model provides a kind of battery charge controller, for charging for battery pack, the battery charge controller packet It includes: conversion circuit, conversion control circuit, the first driving circuit, the second driving circuit, protection circuit and controller；The protection Circuit includes the first protection branch；The conversion circuit is separately connected first driving circuit and the controller, and described Two driving circuits are connect with first driving circuit, and the conversion control circuit is connect with the conversion circuit, the control Device is separately connected the conversion control circuit, second driving circuit, and the first protection branch is separately connected the control Device and the conversion control circuit；The conversion control circuit turns the ac signal of input for controlling the conversion circuit It is changed to constant the first DC signal and the second DC signal and exports；The controller is used for: when receiving described turn When changing second DC signal of circuit output, the saturation signal of the battery pack is obtained, and according to the saturation signal, Controlling the first protection branch makes the conversion control circuit stop working.

In some embodiments, the protection circuit further includes the second protection branch, and the second protection branch connects respectively The conversion circuit and the conversion control circuit are connect, if the second protection branch is used for the first of conversion circuit output DC signal is greater than preset threshold, and the conversion control circuit is made to stop working.

In some embodiments, the protection circuit further includes isolation branch, and the first protection branch, described second protect Shield branch is connect by the isolation branch with the conversion control circuit respectively.

In some embodiments, the first protection branch includes: first resistor, second resistance and first diode；Institute The one end for stating first resistor is connect with the controller, and the anode of the other end of the first resistor and the first diode is even It connects, branch connection is isolated with described in the cathode of the first diode, and the cathode of the first diode also passes through described second Resistance eutral grounding.

In some embodiments, the second protection branch includes: 3rd resistor, the second diode and voltage-stabiliser tube；It is described One end of 3rd resistor is connect with the conversion circuit, and the other end of the 3rd resistor is connect with the cathode of the voltage-stabiliser tube, The anode of the voltage-stabiliser tube is connect with the anode of second diode, and branch is isolated with described in the cathode of second diode Connection, the cathode of second diode are also grounded by the second resistance.

In some embodiments, the isolation branch includes: optical coupling isolator；It is the cathode of the first diode, described The cathode of second diode is connect with the first input end of the optical coupling isolator respectively, the second input of the optical coupling isolator End ground connection, the first output end of the optical coupling isolator are connect with the conversion control circuit, and the second of the optical coupling isolator Output end ground connection.

In some embodiments, the conversion circuit includes: EMC filter, the first rectifying and wave-filtering sub-circuit, switch transformation Device, the second rectifying and wave-filtering sub-circuit and low pressure pressure stabilizing sub-circuit；The input terminal of the EMC filter is for inputting the alternating current Signal, the input terminal of the first rectifying and wave-filtering sub-circuit are connect with the output end of the EMC filter, the switch transformer Input terminal connect with the output end of the first rectifying and wave-filtering sub-circuit, the first output end of the switch transformer with it is described The input terminal of second rectifying and wave-filtering sub-circuit connects, the output end of the second rectifying and wave-filtering sub-circuit and the first driving electricity The input terminal on road connects, and the output end of the second rectifying and wave-filtering sub-circuit is also connect with the second protection branch, described to open The second output terminal for closing transformer is connect with the input terminal of the low pressure pressure stabilizing sub-circuit, the output of the low pressure pressure stabilizing sub-circuit End is connect with the power pins of the controller；The EMC filter is filtered the ac signal of input, with filter Except electromagnetic interference, it is straight that the alternating current that the EMC filter exports is converted to high-frequency and high-voltage by the first rectifying and wave-filtering sub-circuit Galvanic electricity signal, the switch transformer are converted to the high-frequency high-voltage direct-current electric signal that the first rectifying and wave-filtering sub-circuit exports High frequency low voltage DC signal, the high frequency low voltage direct current that the second rectifying and wave-filtering sub-circuit exports the switch transformer Signal is changed into first DC signal and exports to first driving circuit, and the low pressure pressure stabilizing sub-circuit will be described The high frequency low voltage direct current of switch transformer output is changed into second DC signal and exports to the controller.

In some embodiments, the conversion control circuit include: start-up resistor, switch MOS controller, switch metal-oxide-semiconductor, Peak absorbing sub-circuit, power supply sub-circuit, sample resistance, voltage control sub-circuit, current control sub-circuit and feedback sub-circuit； One end of the start-up resistor is connect with the output end of the first rectifying and wave-filtering sub-circuit, the other end of the start-up resistor with The switch MOS controller connection, the peak absorbing sub-circuit are parallel to the input terminal of the switch transformer, the switch The first end of metal-oxide-semiconductor is connect with the peak absorbing sub-circuit with the common connection end of the switch transformer, the switch MOS The second end of pipe is connect with the switch MOS controller, and the third end of the switch metal-oxide-semiconductor and the switch MOS controller connect Connect and be grounded, it is described power supply sub-circuit one end connect with the switch MOS controller, it is described power sub-circuit the other end and The input terminal of the switch transformer connects, and one end of the sample resistance is connect with the output end of the switch transformer, institute The other end for stating sample resistance is connect with the first end of the current control sub-circuit, the second end of the current control sub-circuit It is connect with the controller, the third end of the current control sub-circuit is connect with the low pressure pressure stabilizing sub-circuit, the electric current 4th end of control sub-circuit is connect with the first end of the feedback sub-circuit, the first end of the voltage control sub-circuit and institute The connection of the second rectifying and wave-filtering sub-circuit is stated, the second end of the voltage control sub-circuit and the first end of the feedback sub-circuit connect Connect, the second end of the feedback sub-circuit is connect with the switch MOS controller, the switch MOS controller also with the light First output end of coupling isolator connects.

The utility model additionally provides a kind of charger, including above-mentioned battery charge controller.

The utility model additionally provides a kind of electric tool, including battery pack, complete machine and above-mentioned charger, the charging Device is connect with the battery pack, and for charging to the battery pack, the complete machine and the battery pack connect the charger It connects, the battery pack is powered in for the complete machine.

The beneficial effect of the utility model embodiment is: being in contrast to the prior art down, the utility model embodiment One kind of offer controls conversion control circuit in abnormal charged state by the first protection branch and stops working, to stop to electricity Chi Bao charging, can solve the problem of extremely caused battery pack of charger overcharges, can protect to battery charge controller, To improve security reliability.

Detailed description of the invention

One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove Non- to have special statement, composition does not limit the figure in attached drawing.

Fig. 1 is the structural schematic diagram of electric tool provided by the embodiment of the utility model；

Fig. 2 is the structural schematic diagram of the battery pack of Fig. 1；

Fig. 3 is the structural schematic diagram of the charger of Fig. 1；

Fig. 4 is the structural schematic diagram of battery charge controller provided by the embodiment of the utility model；

Fig. 5 is the structural schematic diagram of the battery charge controller of Fig. 4；

Fig. 6 is the partial structure diagram of the battery charge controller of Fig. 4；

Fig. 7 is the structural schematic diagram of the battery charge controller of Fig. 4.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to The range of the utility model protection.

As long as in addition, technical characteristic involved in the various embodiments of the present invention described below each other it Between do not constitute conflict and can be combined with each other.

With the development of the society, portable power tool is in our life using more and more extensive.Electric tool one As include three-piece, respectively complete machine, battery pack and charger, charger is by connection AC power source and battery pack, to be Battery pack charging, when complete machine needs in use, complete machine is connect with battery pack, battery pack is complete machine power supply, so that complete machine can Running.

Current charger is usually provided with charging metal-oxide-semiconductor as protection is overcharged, when device charging is filled in use, due to certain Reason (such as electrostatic) makes charging metal-oxide-semiconductor breakdown, and charge circuit, which then loses, overcharges protection, is easy to overcharge battery pack, very To causing battery pack to burst, catch fire.The security reliability of this charger is lower.

Based on this, the utility model embodiment provides a kind of battery charge controller, charger and electric tool, can be improved Security reliability.

Specifically, with reference to the accompanying drawing, the utility model embodiment is further elaborated.

Fig. 1 is the structural schematic diagram of electric tool provided by the embodiment of the utility model.As shown in Figure 1, electric tool 300 Including charger 200, battery pack 310 and complete machine 320, battery pack 310 can connect with charger 200 or connect with complete machine 320.When When charger 200 is connect with battery pack 310, charger 200 is used to charge to battery pack 310 by input ac power； When complete machine 320 is connect with battery pack 310, battery pack 310 is used to power for complete machine 320 to operate complete machine.Wherein, complete machine 320 can be electric drill, electric wrench, electric screw driver, electric drill etc., and complete machine 320 obtains electric energy by connection battery pack 310, When battery pack 310 is out of power, battery pack 310 connect with charger 200 and charges.

Wherein, as shown in Fig. 2, battery pack 310 includes battery pack 311.Wherein, battery pack 311 includes several section monocells. Wherein, battery pack 311 can be lithium battery group, battery group etc., and in the present embodiment, battery pack 311 is lithium battery group.? In some other embodiments, as shown in Fig. 2, battery pack 310 further includes battery management circuit 312, battery pack 311 and battery management Circuit 312 is attached, so that battery management circuit 312 controls the charge and discharge of battery pack 311, and in battery pack 310 when being not used and (not carrying out charge and discharge), and battery management circuit 312 is automatically into zero-power mode, to cut off battery pack The power supply of 311 pairs of battery management circuits 312.Wherein, battery management circuit 312 can be fabricated to pcb board, as battery pack 311 Protection board, and be placed in same housing with battery pack 311.

Wherein, as shown in figure 3, charger 200 includes battery charge controller 100.Wherein, battery charge controller 100 can be with Circuit board is fabricated to be contained in the shell of charger 200.Battery charge controller 100 can with battery pack 310 or complete machine 320 into Row connection.Specifically, battery charge controller 100 is attached by battery management circuit 312 with battery pack 311, thus for electricity Pond group 311 charges.

Specifically, referring to Fig. 4, Fig. 4 is the structural schematic diagram of battery charge controller provided by the embodiment of the utility model. Battery charge controller 100 includes: conversion circuit 110, conversion control circuit 120, the first driving circuit 130, the second driving circuit 140, controller 150 and protection circuit 160.

Wherein, protection circuit 160 includes the first protection branch 161, and conversion circuit 110 is separately connected the first driving circuit 130 and controller 150, the second driving circuit 140 connect with the first driving circuit 130, conversion control circuit 120 and conversion circuit 110 connections, controller 150 are separately connected conversion control circuit 120, the second driving circuit 140, and the first protection branch 161 is distinguished Connect controller 150 and conversion control circuit 120.

In the present embodiment, 110 input AC electric signal of conversion circuit, and will under the control of conversion control circuit 120 The ac signal of input is converted to constant the first DC signal and the second DC signal, and by the first DC signal Output exports the second DC signal to controller 150, controller 150 receives conversion circuit to the first driving circuit 130 When the second DC signal of 110 outputs, controller 150 is waken up, when getting the saturation signal of battery pack 310, according to Saturation signal control first protection branch 161 so that conversion control circuit 120 is stopped working, thus prevent conversion circuit 110 from after Continuous output DC signal, and then cannot charge to battery pack 310, to improve the security reliability of charger 200.

Referring again to Fig. 4, protecting circuit 160 further includes the second protection branch 162 and isolation branch 163.Second protection branch Road 162 is separately connected conversion circuit 110 and conversion control circuit 120, if the second protection branch 162 is defeated for conversion circuit 110 The first DC signal out is greater than preset threshold, and conversion control circuit 120 is made to stop working.First protection branch 161, second Protection branch 162 is connect by the way that branch 163 is isolated with conversion control circuit 120 respectively.

Wherein, please refer to fig. 5, conversion circuit 110 includes: EMC filter 111, the first rectifying and wave-filtering sub-circuit 112, switch transformer 113, the second rectifying and wave-filtering sub-circuit 114 and low pressure pressure stabilizing sub-circuit 115.

Wherein, the input terminal of EMC filter 111 is used for input AC electric signal, the output end of EMC filter 111 and the The input terminal of one rectifying and wave-filtering sub-circuit 112 connects, switch transformer 113 and the first rectifying and wave-filtering of input terminal sub-circuit 112 Output end connection, the first output end of switch transformer 113 connect with the input terminal of the second rectifying and wave-filtering sub-circuit 114, the The output end 114 of two rectifying and wave-filtering sub-circuits 114 is connect with the input terminal of the first driving circuit 130, the second rectifying and wave-filtering electricity The output end on road 114 is also connect with the input terminal of the second protection branch 162, the second output terminal and low pressure of switch transformer 113 The input terminal of pressure stabilizing sub-circuit 115 connects, and the output end of low pressure pressure stabilizing sub-circuit 115 is connect with the power pins of controller 150.

Wherein, EMC filter 111 can be interfered by impedance filtering common mode, in the present embodiment, EMC filter 111 structure is as shown in fig. 6, EMC filter 111 is used to that the ac signal of input to be filtered and be exported, to filter out electricity Magnetic disturbance, wherein the ac signal of input can be 220V 50Hz ac signal.

Wherein, the first current rectifying and wave filtering circuit 112 can convert alternating current to direct current, and in the present embodiment, first is whole The structure of filter circuit 112 is flowed as shown in fig. 6, the first current rectifying and wave filtering circuit 112 is used for the exchange for exporting EMC filter 111 Electricity is converted to high-frequency high-voltage direct-current electric signal, for example, 220V alternating current is converted to 280V direct current.

Wherein, switch transformer 113 is able to carry out decompression, in the present embodiment, the structure of switch transformer 113 such as Fig. 6 Shown, the high-frequency high-voltage direct-current electric signal that switch transformer 113 is used to export the first rectifying and wave-filtering sub-circuit 112 is depressured, with Be converted to high frequency low voltage DC signal.

Wherein, the second rectifying and wave-filtering sub-circuit 114 is able to carry out frequency reducing, to obtain smooth direct current.In this implementation In example, the structure of the second rectifying and wave-filtering sub-circuit 114 is as shown in fig. 6, the second rectifying and wave-filtering sub-circuit 114 is used to that transformation will to be switched The high frequency low voltage DC signal that device 113 exports is changed into the first DC signal, and exports to the first driving circuit 130.

Wherein, low pressure pressure stabilizing sub-circuit 115 can be low differential voltage linear voltage stabilizer circuit, for exporting fixed voltage letter Number.In the present embodiment, the structure of low pressure pressure stabilizing sub-circuit 115 is as shown in fig. 6, low pressure pressure stabilizing sub-circuit 115 is used to switch The high frequency low voltage direct current that transformer 113 exports is changed into the second DC signal, and exports to controller 150, thus for control Device 150 processed is powered, for example, the second DC signal can be 5V d. c. voltage signal.

Wherein, also referring to Fig. 5 and Fig. 6, conversion control circuit 120 includes: start-up resistor 121, switch MOS controller 122, peak absorbing sub-circuit 123, switch metal-oxide-semiconductor 124, power supply sub-circuit 125, sample resistance 126, voltage control sub-circuit 127, current control sub-circuit 128 and feedback sub-circuit 129.

Wherein, one end of start-up resistor 121 is connect with the output end of the first current rectifying and wave filtering circuit 112, start-up resistor 121 The other end is connect with switch MOS controller 122, the input terminal of peak absorbing sub-circuit 123 and the first current rectifying and wave filtering circuit 112 Output end connection, the output end of peak absorbing sub-circuit 123 are connect with the input terminal of switch transformer 113, switch metal-oxide-semiconductor 124 First end connect with peak absorbing sub-circuit 123 with the common connection end of switch transformer 113, switch metal-oxide-semiconductor 124 third The second end of end and 122 connect and ground of switch MOS controller, switch metal-oxide-semiconductor 124 is connect with switch MOS controller 122, is supplied One end of electronic circuit 125 is connect with switch MOS controller 122, the other end and switch transformer 113 of sub-circuit 125 of powering Input terminal connection, one end of sample resistance 126 connect with the output end of switch transformer 113, the other end of sample resistance 126 It is connect with the first end of current control sub-circuit 128, the second end of current control sub-circuit 128 is connect with controller 150, electric current The third end of control sub-circuit 128 is connect with low pressure pressure stabilizing sub-circuit 115, the 4th end of current control sub-circuit 128 and feedback The first end of sub-circuit 129 connects, and the first end of voltage control sub-circuit 127 is connect with the second rectifying and wave-filtering sub-circuit 114, electricity The second end of voltage-controlled system circuit 127 is connect with the first end of feedback sub-circuit 129, the second end of feedback sub-circuit 129 with open It closes MOS controller 122 to connect, switch MOS controller 122 is also connected with the output end that branch 163 is isolated.

It should be noted that switch metal-oxide-semiconductor 124 is not shown in the conversion control circuit 120 in Fig. 6, switch metal-oxide-semiconductor 124 is adopted It is set in switch MOS controller 122 with built-in set-up mode.Certainly, in some other embodiments, switch metal-oxide-semiconductor 124 can also To be set in conversion control circuit 120 using external set-up mode.

Wherein, switch MOS controller 122 can be pwm chip, beat on and off for control switch metal-oxide-semiconductor 124 It is disconnected to be converted to constant the first DC signal and second directly to control conversion circuit 110 for the ac signal of the input Galvanic electricity signal simultaneously exports.

Wherein, feedback sub-circuit 129 can be photo-coupler, input terminal and current control the son electricity of feedback sub-circuit 129 The third output end on road 128 connects, and the output end of feedback sub-circuit 129 is connect with switch MOS controller 122.

In the present embodiment, the electric signal of the first rectifying and wave-filtering sub-circuit 112 output passes through 121 input switch of start-up resistor MOS controller 122 provides power supply for switch MOS controller 122, thus wake-up switch MOS controller 122, switch MOS control Device 122 passes through the on or off for sending pwm signal control switch metal-oxide-semiconductor 124, thus in the input stage of switch transformer 113 It generates high-frequency signal driving switch transformer 113 and generates the first DC signal and the second DC signal, peak absorbing electricity Road 123 is for absorbing spike electric signal, with protective switch metal-oxide-semiconductor 124, meanwhile, current control sub-circuit 128 passes through sample resistance 126 obtain the current signal of the output stage of switch transformer 113, and obtain the current signal of the output of controller 170, export to anti- Sub-circuit 129 is presented, voltage controls the output stage that sub-circuit 127 obtains switch transformer 113 from the second rectifying and wave-filtering electron current 114 Voltage signal, output is to feedback sub-circuit 129, to feed back to switch MOS controller 122, to carry out feedback regulation, thus The ac signal of the input is converted to constant the first DC signal and the second direct current telecommunications by control conversion circuit 110 Number and export.

Optionally, also referring to Fig. 5 and Fig. 6, the first driving circuit 130, the second driving circuit 140 can be metal-oxide-semiconductor Circuit, triode circuit etc. can be selected according to actual use situation.In the present embodiment, the first driving circuit 130 Link up enhanced metal-oxide-semiconductor for P, the second driving circuit 140 is that N links up enhanced metal-oxide-semiconductor, the drain electrode of the first driving circuit 130 with The connection of second rectifying and wave-filtering sub-circuit 114, the source electrode of the first driving circuit 130 with battery pack 310 for connecting, the first driving electricity The grid on road 130 is connect with the drain electrode of the second driving circuit 140, the source electrode ground connection of the second driving circuit 140, the second driving circuit 140 grid is connect with the Va pin of controller 150.Controller 150 exports high level by control Va pin, makes the second driving Circuit 140 is connected, thus the first driving circuit 130 of conducting.It certainly, can be according to using needs in some other embodiments Other components, such as resistance, diode etc. are added in the first driving circuit 130, the second driving circuit 140.

Wherein, controller 150 can be include processor, with control processing function specific integrated circuit (Application-Specific Integrated Circuit, ASIC), field-programmable gate array (Field Programmable Gate Array, FPGA), single-chip microcontroller etc..Specifically, in the present embodiment, referring again to Fig. 5 to Fig. 7, The VCC pin of controller 150 is connect with low pressure pressure stabilizing sub-circuit 115, to obtain power supply from low pressure pressure stabilizing sub-circuit 115；Control The CC pin of device 150 is connect with current control sub-circuit 128, to carry out current constant control；The Va pin of controller 150 and second Driving circuit 140 connects, to control the second driving circuit 140；The lach pin of controller 150 and first protects branch 161 Input terminal connection makes conversion control circuit 120 stop working with control the first protection branch 161；Controller 150 also passes through COM Port is connect with battery pack 310, to obtain the saturation signal of battery pack 310.

Wherein, referring to Figure 7 together, the first protection branch 161 includes: first resistor R1, second resistance R2 and the one or two Pole pipe D1.One end of first resistor R1 is connect with the lach pin of controller 150, the other end of first resistor R1 and the one or two pole The anode connection of pipe D1, the cathode of first diode D1 also pass through the with the connection of branch 163, the cathode of first diode D1 is isolated Two resistance R2 ground connection.

Wherein, referring to Figure 7 together, the second protection branch 162 includes: 3rd resistor R3, the second diode D2 and pressure stabilizing Pipe ZD1.One end of 3rd resistor R3 is connect with the output end of the second rectifying and wave-filtering sub-circuit 114 of conversion circuit 110, third electricity The other end of resistance R3 is connect with the cathode of voltage-stabiliser tube ZD1, and the anode of voltage-stabiliser tube ZD1 is connect with the anode of the second diode D2, the The cathode of two diode D2 is connected with branch 163 is isolated, and the cathode of the second diode D2 also passes through second resistance R2 and is grounded.

Wherein, referring to Figure 7 together, isolation branch 163 includes: optical coupling isolator U1.The cathode of first diode D1, The cathode of two diode D2 is connect with the first input end of optical coupling isolator U1 respectively, the second input termination of optical coupling isolator U2 Ground, the first output end of optical coupling isolator U2 are connect with the switch MOS controller 122 of conversion control circuit 120, optical coupling isolator The second output terminal of U2 is grounded.

Optionally, referring again to Fig. 4, battery charge controller 100 further include: communicating circuit 170, communicating circuit 170 and control Device 150 processed connects.Controller 150 is also used to: COM port is connected by communicating circuit 170, thus connect with battery pack 310, into And obtain the saturation signal of battery pack 310.

Optionally, referring again to Fig. 4, battery charge controller 100 further include: status display circuit 180, status display circuit 180 connect with controller 150.Controller 150 is also used to: if charging detection voltage value is abnormal, state of a control display circuit 180 is aobvious Show abnormality, output stops charging control signal, so that the second driving circuit 140 is according to stopping charging control signal shutdown the One drive circuit 130, to stop charging to battery pack 310.Wherein, status display circuit 180 can be indicator light, display screen Etc., in the present embodiment, status display circuit 180 is indicator light, and when charging detects voltage value exception, controller 150 is controlled Status display circuit 180 processed flashes, to show abnormality.

In the present embodiment, referring again to Fig. 7, the course of work of battery charge controller 100 is substantially are as follows: when charge control fills When setting 100 and charging normal, controller 150 receives the saturation signal of battery pack 310, and it is low that controller 150 controls the output of Va pin Level ends the second driving circuit 140, so that the first driving circuit 130 turns off, cuts off charge circuit, to stop to electricity 310 charging of pond packet；

When battery charge controller 100 be in abnormal charged state (controller 150 receives the saturation signal of battery pack 310, Controller 150 controls Va pin and exports low level, and the second driving circuit 140 of driving ends, but since the first driving circuit 130 is hit Short circuit is worn, charge circuit can not be cut off), at this point, the lach pin of controller 150 exports high level, the first protection branch 161 is opened Beginning work, high level signal pass through first resistor R1, first diode D1, optical coupling isolator U1, and optical coupling isolator U1 is connected, Optical coupling isolator U1 exports high level signal to switch MOS controller 122, switch MOS controller 122 according to high level signal, Control switch metal-oxide-semiconductor 124 stops working, and switch transformer 113 does not export DC signal, to stop filling battery pack 310 Electricity；

When battery charge controller 100 is in abnormal charged state, (for battery charge controller 100 due to being used for a long time, conversion is electric The electrolytic capacitor tracking of the second rectifying and wave-filtering sub-circuit 114 on road 110 causes the second rectifying and wave-filtering sub-circuit 114 to export The first DC signal increase), at this point, the input terminal of the second protection branch 162 is from the defeated of the second rectifying and wave-filtering sub-circuit 114 Outlet obtains Vch voltage signal, if Vch voltage signal is more than preset value, so that the voltage-stabiliser tube ZD1 of the second protection branch 162 is hit It wears, optical coupling isolator U1 is connected, optical coupling isolator U1 exports high level signal to switch MOS controller 122, switch MOS control Device 122 processed stops working according to high level signal, control switch metal-oxide-semiconductor 124, and switch transformer 113 does not export DC signal, To stop charging to battery pack 310.

Battery charge controller 100 is different at two kinds by the first protection branch 161 and the second protection branch 162 in the present embodiment Normal charged state, which controls conversion control circuit 120 by isolation branch 163, makes switch metal-oxide-semiconductor 124 stop working, switch transformer 113 do not export DC signal, to stop charging to battery pack 310, can solve the extremely caused battery pack mistake of charger The problem of filling can be improved security reliability.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments, Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be Simplicity, they do not provide in details；Although the utility model is described in detail with reference to the foregoing embodiments, this The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, Or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make the sheet of corresponding technical solution Matter departs from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a kind of battery charge controller, which is characterized in that for charging for battery pack, the battery charge controller includes: conversion Circuit, conversion control circuit, the first driving circuit, the second driving circuit, protection circuit and controller；

The protection circuit includes the first protection branch；

The conversion circuit is separately connected first driving circuit and the controller, second driving circuit and described the One drive circuit connection, the conversion control circuit are connect with the conversion circuit, and the controller is separately connected the conversion Control circuit, second driving circuit, the first protection branch are separately connected the controller and conversion and control electricity Road；

The ac signal of input is converted to constant first directly for controlling the conversion circuit by the conversion control circuit Galvanic electricity signal and the second DC signal simultaneously export；

The controller is used for: when receiving second DC signal of the conversion circuit output, obtaining the electricity The saturation signal of Chi Bao, and according to the saturation signal, controlling the first protection branch stops the conversion control circuit Work.

2. the apparatus according to claim 1, which is characterized in that the protection circuit further includes the second protection branch, described Second protection branch is separately connected the conversion circuit and the conversion control circuit, if the second protection branch is for described First DC signal of conversion circuit output is greater than preset threshold, and the conversion control circuit is made to stop working.

3. the apparatus of claim 2, which is characterized in that the protection circuit further includes that branch is isolated, and described first Protection branch, the second protection branch are connect by the isolation branch with the conversion control circuit respectively.

4. device according to claim 3, which is characterized in that the first protection branch includes: first resistor, the second electricity Resistance and first diode；

One end of the first resistor is connect with the controller, the other end of the first resistor and the first diode Branch connection is isolated with described in anode connection, the cathode of the first diode, and the cathode of the first diode also passes through institute State second resistance ground connection.

5. device according to claim 4, which is characterized in that the second protection branch includes: 3rd resistor, the two or two Pole pipe and voltage-stabiliser tube；

One end of the 3rd resistor is connect with the conversion circuit, and the other end of the 3rd resistor is negative with the voltage-stabiliser tube The anode of pole connection, the voltage-stabiliser tube is connect with the positive of second diode, the cathode of second diode with it is described Branch connection is isolated, the cathode of second diode is also grounded by the second resistance.

6. device according to claim 5, which is characterized in that the isolation branch includes: optical coupling isolator；

The cathode first input end with the optical coupling isolator respectively of the cathode of the first diode, second diode Connection, the second input end grounding of the optical coupling isolator, the first output end of the optical coupling isolator and the conversion and control Circuit connection, the second output terminal ground connection of the optical coupling isolator.

7. device according to claim 6, which is characterized in that the conversion circuit includes: EMC filter, the first rectification Filter sub-circuit, switch transformer, the second rectifying and wave-filtering sub-circuit and low pressure pressure stabilizing sub-circuit；

The input terminal of the EMC filter is for inputting the ac signal, the input of the first rectifying and wave-filtering sub-circuit End is connect with the output end of the EMC filter, the input terminal of the switch transformer and the first rectifying and wave-filtering sub-circuit Output end connection, the first output end of the switch transformer connect with the input terminal of the second rectifying and wave-filtering sub-circuit, The output end of the second rectifying and wave-filtering sub-circuit is connect with the input terminal of first driving circuit, second rectifying and wave-filtering The output end of sub-circuit is also connect with the second protection branch, and the second output terminal of the switch transformer and the low pressure are steady The input terminal connection of sub-circuit is pressed, the output end of the low pressure pressure stabilizing sub-circuit is connect with the power pins of the controller；

The EMC filter is filtered the ac signal of input, to filter out electromagnetic interference, the first rectification filter The alternating current that the EMC filter exports is converted to high-frequency high-voltage direct-current electric signal by marble circuit, and the switch transformer will The high-frequency high-voltage direct-current electric signal of first rectifying and wave-filtering sub-circuit output is converted to high frequency low voltage DC signal, and described the The high frequency low voltage DC signal that the switch transformer exports is changed into first direct current by two rectifying and wave-filtering sub-circuits Signal simultaneously exports the high frequency low voltage for exporting the switch transformer to first driving circuit, the low pressure pressure stabilizing sub-circuit Direct current is changed into second DC signal and exports to the controller.

8. device according to claim 7, which is characterized in that the conversion control circuit includes: start-up resistor, switch MOS controller, switch metal-oxide-semiconductor, peak absorbing sub-circuit, power supply sub-circuit, sample resistance, voltage control sub-circuit, electric current control System circuit and feedback sub-circuit；

One end of the start-up resistor is connect with the output end of the first rectifying and wave-filtering sub-circuit, the start-up resistor it is another End is connect with the switch MOS controller, and the peak absorbing sub-circuit is parallel to the input terminal of the switch transformer, described The first end of switch metal-oxide-semiconductor is connect with the peak absorbing sub-circuit with the common connection end of the switch transformer, described to open The second end for closing metal-oxide-semiconductor is connect with the switch MOS controller, and the third end of the switch metal-oxide-semiconductor and the switch MOS are controlled One end of device connect and ground, the power supply sub-circuit is connect with the switch MOS controller, described the another of sub-circuit that power End is connect with the input terminal of the switch transformer, and the output end of one end of the sample resistance and the switch transformer connects It connects, the other end of the sample resistance is connect with the first end of the current control sub-circuit, the current control sub-circuit Second end is connect with the controller, and the third end of the current control sub-circuit is connect with the low pressure pressure stabilizing sub-circuit, institute The 4th end for stating current control sub-circuit is connect with the first end of the feedback sub-circuit, and the first of the voltage control sub-circuit End connect with the second rectifying and wave-filtering sub-circuit, and the voltage controls the of the second end of sub-circuit and the feedback sub-circuit One end connection, the second end of the feedback sub-circuit connect with the switch MOS controller, the switch MOS controller also with First output end of the optical coupling isolator connects.

9. a kind of charger, which is characterized in that including the described in any item battery charge controllers of claim 1-8.

10. a kind of electric tool, which is characterized in that described to fill including battery pack, complete machine and charger as claimed in claim 9 Electric appliance is connect with the battery pack, and the charger is for charging to the battery pack, the complete machine and the battery pack Connection, the battery pack are powered in for the complete machine.