Alternative looping recharger
Technical field
The present invention relates to a kind of alternative looping recharger, refer to that especially a kind of constant voltage mode and constant current mode of utilizing is alternately to the charging device of battery charge.
Background technology
The charging of general known lithium battery need be passed through pre-charge stage (precharge), constant-current charge stage (normal charge), reaches the constant-voltage charge stage (top-off), begin to finish charging at last and automatic complete charge.Please refer to Fig. 1, be the schematic diagram of each stage charging of known batteries.When battery once during deep discharge, battery charge should be introduced into the pre-charge stage, and in the pre-charge stage, power supply partly provides one little to decide electric current I P to battery charge, arrives a normal voltage value Vn up to cell voltage.Then enter the constant-current charge stage after the pre-charge stage, power supply partly provides specified and decides electric current I n with fast to battery charge.After quick charge, battery reaches a critical voltage Vc, and the electric current I t that decides that power supply partly stops to provide specified changes into constant-voltage charge (CV).In the constant-voltage charge stage, charging current I can descend gradually, waits when dropping to a charging current terminal value It, and very near a charging desired value Vt of cell voltage, the beginning is finished charging and automatic complete charge to cell voltage V.
From above as can be known, in the process of known batteries charging, need to carry out following each function action:
1. set pre-charge stage and the current value of constant-current charge during the stage.
2. set the magnitude of voltage of normal battery voltage and target battery voltage.
3. detecting cell voltage.
4. detecting charging current.
Please refer to Fig. 2, be known batteries charging device schematic diagram.Converting unit 110 is converted into a charge power supply 112 so that battery 30 is charged with mains supply 111, provides accessory power supply 113 to provide power supply to use to each electronic building brick in the circuit simultaneously.Converting unit 110 has two back coupling input endpoints (114,115), is to be used for accepting feedback signal, to regulate the output of charge power supply 112.
Voltage error amplifier 120 comparison charge power supplies 112 and a reference voltage 121 are in order to export a voltage feedback signal, and this voltage feedback signal is input to feedbacks input endpoint 114 to adjust the voltage output of constant charge power supply 112.The charging current signal 131 of current error amplifier 130 comparison batteries 30 and a current reference value 132 are in order to export an electric current feedback signal, and this electric current feedback signal is input to back coupling input endpoint 115, to adjust the electric current output of constant charge power supply 112.The voltage of detecting voltage comparison circuit 150 acquisition batteries 30, and the voltage that will capture and a reference voltage 151 compare computing, to export an electric potential signal 152.The current signal (131) of current sense comparison circuit 160 acquisition batteries 30, and the current signal that will capture and a reference voltage 161 compare computing, to export an electric potential signal 162.Controller 170 provides reference voltage 151,161 to this detecting voltage comparison circuit 150 and this current sense comparison circuit 160 respectively, provides control signal 143,144 to use to a control switch group 140 simultaneously.Control signal 143,144 switching that replaces of control switch 141,142 complementations respectively is in order to the charge path of different resistances that 30 chargings of 112 pairs of batteries of charge power supply are provided.
The required electronic building brick that expends of known battery charger is a lot of, make it can't effectively dwindle the size of encapsulation, also relative many of employed controller 170 its output/input pins simultaneously, the control circuit that makes is more complicated, and the required price that expends is costliness also.
Summary of the invention
In view of this, the present invention uses easy charging device topology, in order to reduce in the known charging device framework complicated electronic building brick, be utilize that constant voltage mode and constant current mode replace to battery charge.
Alternative looping recharger of the present invention includes: the controller that one first reference voltage and one second reference voltage can be provided; One voltage error amplifier is connected in battery and this controller, is that detecting obtains a battery voltage signal and this first reference voltage, and this battery voltage signal and this first reference voltage are compared computing, to export a voltage error signal; One current error amplifier is connected in this battery and this controller, is to obtain a battery current signal and this second reference voltage, and this battery current signal and this second reference voltage are compared computing, to export a current error signal; One signal selector is connected in this voltage error amplifier and this current error amplifier, receives this voltage error signal and this current error signal, in order to select wherein an output as feedback signal; An and transducer, be connected in mains supply and this battery, it is feedback signal according to this signal selector output, in order to this mains supply is converted into a suitable charge power supply, wherein, this first reference voltage that this controller provides and this second reference voltage are to adjust according to the size of this voltage or current error signal.。
Above general introduction and ensuing detailed description are exemplary in nature all, are in order to further specify protection scope of the present invention.And about other purpose of the present invention and advantage, will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram of each stage charging of known batteries;
Fig. 2 is a known batteries charging device schematic diagram;
Fig. 3 is a circuit diagram of the present invention.
The figure number explanation:
Known:
Converting unit 110 mains supplies 111
Charge power supply 112 accessory power supplys 113
Back coupling input endpoint (114,115) voltage error amplifier 120
Reference voltage 121 current error amplifiers 130
Charging current signal 131 current reference value 132
Control switch group 140 switches 141,142
Control signal 143,144 detecting voltage comparison circuits 150
Reference voltage 151 electric potential signals 152
Current sense comparison circuit 160 reference voltages 161
Electric potential signal 162 controllers 170
Battery 30
The present invention:
Transducer 210 mains supplies 211
Charge power supply 212 accessory power supplys 213
Feedback signal 214 voltage error amplifiers 220
First reference voltage, 221 voltage error signals 222
Battery voltage signal 223 current error amplifiers 230
Battery current signal 231 second reference voltages 232
Current error signal 233 controllers 270
Signal selector 280 batteries 40
Embodiment
Please refer to Fig. 3, be circuit diagram of the present invention.Alternative looping recharger of the present invention includes: the controller 270 that one first reference voltage 221 and one second reference voltage 232 can be provided; One voltage error amplifier 220, be connected in battery 40 and this controller 270, be that detecting obtains a battery voltage signal 223 and this first reference voltage 221, and this battery voltage signal 223 is compared computing with this first reference voltage 221, to export a voltage error signal 222; One current error amplifier 230, be connected in this battery 40 and this controller 270, be to obtain a battery current signal 231 and this second reference voltage 232, and this battery current signal 231 is compared computing with this second reference voltage 232, to export a current error signal 233; One signal selector 280 is connected in this voltage error amplifier 220 and this current error amplifier 230, receives this voltage error signal 222 and this current error signal 233, in order to select one of them output as feedback signal 214; And a transducer 210, be connected in mains supply 211 and this battery 40, be feedback signal 214, in order to this mains supply 211 is converted into a stable charge power supply 212 according to these signal selector 280 outputs.
This signal selector 280 is to be connected to form by two diode D1, D2, receives this voltage error signal 232 and this current error signal 233, and according to the intensity of this two signal, stronger error signal is exported, and becomes a feedback signal 214.
Transducer 210 is converted into charge power supply 212 with civil power 211, is used for to battery 40 chargings, and exports accessory power supply 213 simultaneously to provide other electronic building brick work of charging device of the present invention required electric power.Transducer 210 sees through a back coupling input and connects this signal selector 280, is used for receiving this feedback signal 214.Transducer 210 can be according to this feedback signal 214, in order to adjust output charge power supply 212.
Controller 270 utilizes an input to be connected in the output of voltage error amplifier 220, is used for detecting this voltage error signal 222, then according to this voltage error signal 222, to export and to adjust this first reference voltage 221 and second reference voltage 232.
Please cooperate Fig. 1, again with reference to figure 3, in the pre-charge stage, controller 270 provides low second reference voltage 232 to this current error amplifier 230, provides normal first reference voltage 221 to this voltage error amplifier 220 simultaneously.When battery 40 once during deep discharge, the voltage of battery 40 is less than first reference voltage 221, so the voltage error signal 222 of voltage error amplifier 220 outputs one electronegative potential.Signal selector 280 will select current potential higher, come error signal 233 to current error amplifier 230 as its output signal 214, transducer 210 can be a feedback signal with this signal 214, the battery current signal 231 that detects from battery 40 is stable at the level that second reference voltage 232 sets, battery 40 is charged with fixing low current.
Charge power supply is to battery 40 chargings, and battery 40 is set up voltage gradually, when cell voltage arrives first reference voltage 221, the voltage error signal 222 of voltage error amplifier 220 outputs gos up, when controller 270 detects this pickup signal, can learn that the pre-charge stage has accused and finish, so improve first reference voltage 221 and second reference voltage 232, respectively to a target voltage values and a load current value, to enter the constant-current charge stage.After entering the constant-current charge stage, first reference voltage 221 (being target voltage (cut-off voltage)) is than battery 40 voltage height, so fall back to electronegative potential in the error signal 222 of voltage error amplifier 220 outputs.At this moment, signal selector can be chosen the higher current error signal of current potential 233, as feedback signal 214.Transducer 210 is obtained this feedback signal 214, charge power supply is stable at specified decides electric current with fast to battery 40 chargings.
Specified decides electric current fast to battery 40 chargings, make battery 40 voltages rise to target voltage gradually, when battery 40 voltages during near target voltage, the voltage error signal 222 of voltage error amplifier 220 outputs gos up to overtake the current error signal 233 of current error amplifier 230 outputs.So signal selector can be chosen current potential higher voltage error signal 222, as feedback signal 214.Transducer 210 is obtained this feedback signal 214, and charge power supply is stable at target voltage to battery 40 chargings.Simultaneously, when controller 270 detects the rise of voltage error signal 222, can learn that the constant-current charge stage has accused to finish, thus the beginning constant-voltage charge stage.
In the constant-voltage charge stage, controller 270 needs to detect frequently the termination electric current.For this reason, controller 270 is at first progressively turned down the value of second reference voltage 232 toward charging current terminal value (termination level).At this moment, need only charging current more than terminal value, the output potential of current error amplifier 230, also be current error signal 233, will go up, overtake voltage error signal 222 toward high potential, and leading control feed back control system is turned down the output power of transducer 210.The output potential of voltage error amplifier 220 also is a voltage error signal 222, will fall after rise toward electronegative potential.Fall after rise when controller 270 detects this current potential, can learn that charging current still on terminal value, also is that charging process is not finished as yet.
Notice at this moment that because the output power of transducer 210 is turned down charging process also thereby be obstructed.Controller 270 should be recalled to high potential (target voltage values) to second reference voltage 232, so that charging process is proceeded at once after finishing current detecting.The charging that testing process caused delays thus, and is of short duration when because of it being, can not constitute substantial influence to whole charging process.
Above current detecting process can repeat to implement in the constant-voltage charge stage, until also can not detect the value of second reference voltage 232 toward low-key to the charging current terminal value at controller 270 voltage error signal 222 when electronegative potential falls after rise till.So far, charging process can be considered and finishes.Controller 270 must transfer to one to first reference voltage 221 than electronegative potential, to reduce charging voltage, stops charging current, and complete charge.
In sum, first reference voltage 221 and second reference voltage 232 are exported and adjusted to controller 270 respectively to voltage error amplifier 220 and current error amplifier 230 according to the voltage error signal 222 of voltage error amplifier 220 output.Voltage error amplifier 220 produces voltage error signal 222 and current error signal 233 respectively with current error amplifier 230, and by the intensity of a signal selector 280 according to this two signal, stronger error signal is sent to transducer 210, to regulate power supply, provide each stage battery charge required.
Follow the current detecting principle according to above-described voltage, controller 270 equally can decide the charged state of battery according to the current error signal 233 of current error amplifier 230 outputs, thereby export the first suitable reference voltage 221 and second reference voltage 232, to reach identical charging effect.
In sum; only be the detailed description and the accompanying drawing of the specific embodiment of one of the best of the present invention; but feature of the present invention is not limited thereto; be not in order to restriction the present invention; all scopes of the present invention should be as the criterion with claim, and all closing in the embodiment of the spirit variation similar with it of protection range of the present invention all should be contained in the category of the present invention; anyly be familiar with this operator in the field of the invention, can think easily and variation or modify all can be encompassed in the claim of the present invention.