Buck charging circuit and formation cabinet with same

Abstract

The utility model discloses a Buck charging circuit and a formation cabinet with the same, and the Buck charging circuit comprises a rectification voltage reduction conversion chip used for voltage reduction charging, a Buck module used for voltage transformation, and a capacity grading battery used for formation capacity grading charging. External power supply is subjected to voltage reduction through the rectification voltage reduction conversion chip U1 and then output to the Buck module, the external power supply is secondarily converted into low voltage through the Buck module and then output to the capacity grading battery, and therefore the corresponding power supply effect is achieved, the power consumption of the charging circuit is reduced through two times of voltage reduction operation at the same time, and the charging efficiency is improved. The problems that in the prior art, a charging mode that charging and discharging control is achieved only through two MOS tubes is low in efficiency, and meanwhile much energy is wasted are solved, and the power consumption of the charging circuit is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a charging circuit field especially relates to a Buck charging circuit and have the formation cabinet of this charging circuit. BACKGROUND

[0002] Formation and capacity distribution are very important in the production and processing of lithium batteries, formation and capacity distribution generally refers to a series of process measures for the first charged battery to make its performance stable, and there is also a special first charging to complete the electrode activation of the battery, capacity selection, performance screening and grading of the lithium battery after formation and capacity distribution operation;

[0003] The existing traditional formation and capacity distribution method is in linear charging mode and linear discharging mode, that is, a MOS tube is connected in series on the charging circuit for constant current charging control, and another MOS tube connected in parallel with the battery for constant current discharging control, but this method is low in efficiency and wastes a lot of energy, therefore, how to realize an energy-saving circuit for reducing short-circuit power consumption during formation and capacity distribution has become an urgent problem to be solved. SUMMARY

[0004] Therefore, it is necessary to propose a Buck charging circuit for reducing short-circuit power consumption during formation and capacity distribution and a formation cabinet with the charging circuit.

[0005] The utility model provides a Buck charging circuit for charging the battery during formation and capacity distribution, comprising a Buck module for voltage conversion, a capacity distribution battery for formation and capacity distribution charging, and a rectifier step-down conversion chip in the Buck module for step-down charging;

[0006] The IN pin of the rectifier step-down conversion chip is connected with an external power supply, the SW pin of the rectifier step-down conversion chip is connected with the input end of the Buck module, the ground end of the Buck module is connected with the GND pin of the rectifier step-down conversion chip and grounded, the output end of the Buck module is connected with the positive electrode of the capacity distribution battery, and the negative electrode of the capacity distribution battery is grounded.

[0007] Further, the SW pin is also connected with one end of a first resistor, the other end of the first resistor is connected with one end of a first capacitor, the other end of the first capacitor is connected with the BST pin of the rectifier step-down conversion chip, the EN pin of the rectifier step-down conversion chip is also connected with one end of a second resistor, and the other end of the second resistor is connected with an external signal source.

[0008] Furthermore, the IN pin is also connected to one end of the third resistor, the other end of the third resistor is connected to one end of the second capacitor and the positive terminal of the first energy storage capacitor, and the negative terminal of the first energy storage capacitor and the other end of the second capacitor are both connected to the GND pin.

[0009] Furthermore, the Buck module includes a first diode, a fourth resistor, a fifth resistor, an inductor, a third capacitor, and a second energy storage capacitor.

[0010] The negative terminal of the first diode, one end of the fourth resistor, and one end of the inductor are all connected to the SW pin. The other end of the fourth resistor is connected to one end of the third capacitor. The other end of the third capacitor and the positive terminal of the first diode are both connected to the GND pin. The other end of the inductor is connected to one end of the fifth resistor, the positive terminal of the second energy storage capacitor, and the positive terminal of the cascade battery. The other end of the fifth resistor and the negative terminal of the second energy storage capacitor are grounded.

[0011] Furthermore, a switch control module is connected in series between the Buck module and the capacity-dividing battery, and the switch control module includes a first sliding rheostat and a second sliding rheostat.

[0012] The input terminal of the first sliding rheostat is connected to the other end of the inductor, the output terminal of the first sliding rheostat is connected to the input terminal of the second sliding rheostat, the output terminal of the second sliding rheostat is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the positive terminal of the cascaded battery, and the control terminals of the first and second sliding rheostats are both connected to an external signal source.

[0013] Furthermore, the positive terminal of the capacity-divided battery is also connected to a voltage acquisition module, which includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a first operational amplifier.

[0014] The positive electrode of the sub-battery is provided with two positive input terminals, the seventh resistor is connected in series between the two positive input terminals and connected with one end of the eighth resistor, the negative electrode of the sub-battery is provided with two negative output terminals, the ninth resistor is connected in series between the two negative output terminals, one end of the ninth resistor is also connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, the other end of the ninth resistor is connected with one end of the eleventh resistor, the other end of the eighth resistor is connected with the positive input terminal of the first operational amplifier and one end of the twelfth resistor, the other end of the eleventh resistor is connected with the negative input terminal of the first operational amplifier and one end of the thirteenth resistor, the power supply positive input terminal and the power supply negative input terminal of the first operational amplifier are connected with external power supply, and the output terminal of the first operational amplifier is connected with the other end of the thirteenth resistor and the preset discharge control module and current control module.

[0015] Further, the output terminal of the first operational amplifier is also connected with one end of the fourteenth resistor, the other end of the fourteenth resistor is connected with the positive input terminal of the second operational amplifier, the negative input terminal of the second operational amplifier is connected with one end of the fifteenth resistor, the other end of the fifteenth resistor is connected with an external signal source, the fourth capacitor is connected in series between the negative input terminal of the second operational amplifier and the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected with the discharge control module and the current control module.

[0016] Further, the discharge control module is connected with a switch driving module, the discharge control module comprises a sixteenth resistor, a first switching diode, a first triode and a second triode, and the switch driving module comprises a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a second diode, a fifth capacitor, a third triode and a fourth triode.

[0017] One end of the sixteenth resistor is connected with an external signal source, the other end of the sixteenth resistor is connected with the positive pole of the first switch diode and the base of the first triode, the first negative pole of the first switch diode is connected with the output end of the second operational amplifier, the second negative pole of the first switch diode is connected with the current control module, the collector of the first triode is connected with the collector of the second triode, the negative pole of the second diode and the input end of the first slide rheostat respectively, the emitter of the first triode is connected with the base of the second triode, the emitter of the second triode is grounded, the positive pole of the second diode is connected with one end of the seventeenth resistor, the other end of the seventeenth resistor is connected with the base of the third triode and one end of the eighteenth resistor, the other end of the eighteenth resistor is connected with an external signal source, the collector of the third triode is connected with one end of the nineteenth resistor, one end of the twentieth resistor and the collector of the fourth triode, the other end of the nineteenth resistor is connected with an external power supply, the base of the fourth triode is connected with one end of the twenty-first resistor, the other end of the twentieth resistor and the other end of the twenty-first resistor are grounded, the emitter of the fourth triode is connected with one end of the fifth capacitor, the other end of the fifth capacitor is grounded.

[0018] Further, the current control module comprises a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a second switch diode, a sixth capacitor and a third operational amplifier.

[0019] One end of the twenty-second resistor is connected with an external signal source, the other end of the twenty-second resistor is connected with one end of the twenty-third resistor and one end of the ninth resistor, the other end of the twenty-third resistor is connected with the positive input end of the third operational amplifier, the negative input end of the third operational amplifier is connected with one end of the twenty-fourth resistor and one end of the sixth capacitor, the other end of the twenty-fourth resistor is connected with an external signal source, the other end of the sixth capacitor is connected with the output end of the third operational amplifier and the first positive pole of the second switch diode, the power supply positive input end of the third operational amplifier and the power supply negative input end of the third operational amplifier are connected with an external power supply respectively, the second positive pole of the second switch diode is connected with the first negative pole of the first switch diode, the negative pole of the second switch diode is connected with one end of the twenty-fifth resistor, the other end of the twenty-fifth resistor is connected with one end of the twenty-sixth resistor, one end of the twenty-seventh resistor and the FB pin of the rectifier step-down conversion chip respectively, the other end of the twenty-sixth resistor is connected with the negative pole of the second diode, the other end of the twenty-seventh resistor is connected with the GND pin.

[0020] The utility model also provides a formation cabinet with the Buck charging circuit, including above described Buck charging circuit.

[0021] The Buck charging circuit and the formation cabinet with the charging circuit have the advantages that the rectification step-down conversion chip U1 is used to output the external power supply to the Buck module after step-down conversion, and then output the low-voltage output to the separate container battery after secondary conversion by the Buck module, so that the corresponding power supply effect is realized, the power consumption of the charging circuit is reduced by twice step-down operation, the problem of low efficiency and waste of energy in the prior art is solved, and the power consumption of the charging circuit is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the premise of the drawings.

[0023] Figure 1 It is a structural schematic diagram of the Buck charging circuit in an embodiment;

[0024] Figure 2 It is a circuit schematic diagram of the rectification step-down conversion chip, the Buck module, the separate container battery and the discharge control module in an embodiment;

[0025] Figure 3 It is a circuit schematic diagram of the voltage acquisition module in an embodiment;

[0026] Figure 4 It is a circuit schematic diagram of the current control module in an embodiment;

[0027] The drawing label description: 1-Buck module, 2-voltage acquisition module, 3-switch control module, 4-discharge control module, 5-switch control module, 6-current control module. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] ReferenceFigure 1 and Figure 2 The utility model provides a kind of Buck charging circuit for in battery is formed into and is charged, including for carrying out Buck module 1 of voltage transformation, for carrying out the rectifier buck conversion chip U1 for carrying out step-down charging in Buck module 1 in step-down charging battery B1;

[0030] rectifier buck conversion chip U1's IN pin is connected with external power supply, rectifier buck conversion chip U1's SW pin is connected with the input end of Buck module 1, to output to Buck module 1 after the voltage reduction of external power supply, the ground end of Buck module 1 is connected with the GND pin of rectifier buck conversion chip U1 and is grounded, the output end of Buck module 1 is connected with the anode of step-down charging battery B1, to realize the charging of step-down charging battery B1 by Buck module 1 after the voltage conversion of input power supply, the cathode of step-down charging battery B1 is grounded.

[0031] As described in the above embodiment, rectifier buck conversion chip U1's the IN pin is connected with external power supply, rectifier buck conversion chip U1's the SW pin is connected with the input end of Buck module 1, it can be understood that the model of rectifier buck conversion chip U1 is any one in MT2492 or MT2496, to output to Buck module 1 after the voltage reduction of external input power supply by the SW pin, it can be understood that Buck module 1 is actually a step-down conversion circuit (Buck circuit), by controlling input duty variable PWM wave switching tube's on and off state, the direct current voltage provided by input power supply is converted into adjustable low voltage output, to realize the power consumption of charging circuit after reducing to step-down charging battery B1 for power supply, to reach corresponding charging effect.

[0032] The embodiment is reduced to Buck module by using rectifier buck conversion chip U1 to output to Buck module after the voltage reduction of external power supply, and is output to step-down charging battery after being converted into low voltage output by Buck module second time, to realize corresponding power supply effect, reaches the power consumption of charging circuit by twice voltage reduction operation, solve the problem that the charging mode of only realizing charge-discharge control by two MOS tubes in prior art is low in efficiency and waste more energy simultaneously, reduce the power consumption of charging circuit.

[0033] Reference Figure 2 In an embodiment, the SW pin is also connected with one end of first resistor R1, the other end of first resistor R1 is connected with one end of first capacitor C1, the other end of first capacitor C1 is connected with the BST pin of rectifier buck conversion chip U1, the EN pin of rectifier buck conversion chip U1 is also connected with one end of second resistor R2, the other end of second resistor R2 is connected with external signal source.

[0034] As described in the above embodiment, the SW pin is also connected in series with the EN pin of the rectifier step-down conversion chip U1, and the first capacitor C1 and the first resistor R1 are also connected in series between the SW pin and the EN pin, so as to realize the effect of pulling up the rectifier step-down conversion chip U1 by changing the value of the capacitor, and the EN pin of the rectifier step-down conversion chip U1 is also connected with the other end of the second resistor R2 and an external signal source, and it can be understood that the external signal source is used to send a charging permission signal, so as to control the rectifier step-down conversion chip U1 to start charging the sub-battery B1.

[0035] Reference Figure 2 In an embodiment, the IN pin is also connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the second capacitor C2 and the positive electrode of the first energy storage capacitor EC1, and the negative electrode of the first energy storage capacitor EC1 and the other end of the second capacitor C2 are both connected with the GND pin.

[0036] As described in the above embodiment, the IN pin and the GND pin are also connected in parallel with the second capacitor C2 and the first energy storage capacitor EC1, so as to realize the effect of grounding the power supply input by the IN pin after filtering.

[0037] Reference Figure 2 In an embodiment, the Buck module 1 is provided with the first diode D1, the fourth resistor R4, the fifth resistor R5, the inductor W1, the third capacitor C3 and the second energy storage capacitor EC2.

[0038] The negative electrode of the first diode D1, one end of the fourth resistor R4 and one end of the inductor W1 are all connected with the SW pin, the other end of the fourth resistor R4 is connected with one end of the third capacitor C3, the other end of the third capacitor C3 and the positive electrode of the first diode D1 are both connected with the GND pin, the other end of the inductor W1 is connected with one end of the fifth resistor R5, the positive electrode of the second energy storage capacitor EC2 and the positive electrode of the sub-battery B1, and the other end of the fifth resistor R5 and the negative electrode of the second energy storage capacitor EC2 are grounded.

[0039] As described in the above embodiment, the negative pole of the first diode D1, one end of the fourth resistor R4 and one end of the inductor W1 are connected to the SW pin in the Buck module 1, the other end of the fourth resistor R4 is connected to one end of the third capacitor C3, the other end of the third capacitor C3 and the positive pole of the first diode D1 are connected to the GND pin, the other end of the inductor W1 is connected to one end of the fifth resistor R5, the positive pole of the second energy storage capacitor EC2 and the positive pole of the sub-battery B1, and the other end of the fifth resistor R5 and the negative pole of the second energy storage capacitor EC2 are grounded. It can be understood that, in the on state, the inductor W1 converts the current through the magnetic field in the center of the inductor into magnetic energy, and stores the magnetic energy in the inductor W1, and in the off state, due to the self-induction of the inductor W1, the magnetic field generates a voltage, converts the electromagnetic energy into electrical energy, and supplies power to the load through the output terminal. Therefore, by controlling the on and off states of the first diode D1, the periodic conversion and adjustment of electrical energy between the second energy storage capacitor EC2 and the inductor W1 are realized, and finally a stable direct current voltage is output.

[0040] Reference Figure 2 In an embodiment, a switch control module 3 is connected in series between the Buck module 1 and the sub-battery B1, and the switch control module 3 includes a first sliding resistor SW1 and a second sliding resistor SW2.

[0041] The input end of the first sliding resistor SW1 is connected to the other end of the inductor W1, the output end of the first sliding resistor SW1 is connected to the input end of the second sliding resistor SW2, the output end of the second sliding resistor SW2 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the positive pole of the sub-battery B1, and the control end of the first sliding resistor SW1 and the control end of the second sliding resistor SW2 are connected to an external signal source.

[0042] As described in the above embodiment, the input end of the first sliding resistor SW1 is connected to the other end of the inductor W1, the output end of the first sliding resistor SW1 is connected to the input end of the second sliding resistor SW2, the output end of the second sliding resistor SW2 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the positive pole of the sub-battery B1, and the control end of the first sliding resistor SW1 and the control end of the second sliding resistor SW2 are connected to an external signal source. It can be understood that, since the control end of the first sliding resistor SW1 and the control end of the second sliding resistor SW2 are connected to an external signal source, the first sliding resistor SW1 and the second sliding resistor SW2 can slide resistance according to the external control signal, thereby adjusting the output of the Buck module 1.

[0043] Reference Figure 1 , Figure 2 and Figure 3In an embodiment, the positive electrode of the capacity grading battery B1 is further connected with a voltage acquisition module 2, and the voltage acquisition module 2 comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a first operational amplifier T1.

[0044] The positive electrode of the capacity grading battery B1 is provided with two positive electrode input ends, the seventh resistor R7 is connected in series between the two positive electrode input ends and connected with one end of the eighth resistor R8, the negative electrode of the capacity grading battery B1 is provided with two negative electrode output ends, the ninth resistor R9 is connected in series between the two negative electrode output ends, and one end of the ninth resistor R9 is further connected with one end of the tenth resistor R10, the other end of the tenth resistor R10 is grounded, the other end of the ninth resistor R9 is connected with one end of the eleventh resistor R11, the other end of the eighth resistor R8 is connected with the positive input end of the first operational amplifier T1 and one end of the twelfth resistor R12, the other end of the eleventh resistor R11 is connected with the negative input end of the first operational amplifier T1 and one end of the thirteenth resistor R13, the power supply positive input end and the power supply negative input end of the first operational amplifier T1 are connected with external power supply, and the output end of the first operational amplifier T1 is connected with the other end of the thirteenth resistor R13, the preset discharge control module 4 and the current control module 6, and simultaneously serves as a real-time voltage detection port of the capacity grading battery B1.

[0045] As described in the above embodiment, the positive electrode of the capacity grading battery B1 is further connected with the voltage acquisition module 2, and it can be understood that the voltage acquisition module 2 can output after signal amplification by the first operational amplifier T1 internally set after obtaining the voltage parameter of the capacity grading battery B1, and since the output end of the first operational amplifier T1 is further connected with the discharge control module 4 and the current control module 6, the discharge control module 4 and the current control module 6 can also control the power supply output of the capacity grading battery B1 according to the voltage signal output by the first operational amplifier T1.

[0046] Reference Figure 3 In an embodiment, the output end of the first operational amplifier T1 is further connected with one end of a fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected with the positive input end of a second operational amplifier T2, the negative input end of the second operational amplifier T2 is connected with one end of a fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected with an external signal source, a fourth capacitor C4 is connected in series between the negative input end of the second operational amplifier T2 and the output end of the second operational amplifier T2, and the output end of the second operational amplifier T2 is connected with the discharge control module 4 and the current control module 6.

[0047] The output terminal of the first operational amplifier T1 is also connected to the positive input terminal of the second operational amplifier T2, and the output terminal of the second operational amplifier T2 is also connected to the discharge control module 4 and the current control module 6. Therefore, the second operational amplifier T2 can send the signal output by the first operational amplifier T1 to the discharge control module 4 and the current control module 6 after amplification, so as to control the power supply output of the sub-battery B1.

[0048] Reference Figure 1 , Figure 2 and Figure 3 In an embodiment, the discharge control module 4 is connected to the switch driving module 5. The discharge control module 4 comprises a sixteenth resistor R16, a first switching diode DS1, a first triode Q1, and a second triode Q2. The switch driving module 5 comprises a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a second diode D2, a fifth capacitor C5, a third triode Q3, and a fourth triode Q4.

[0049] One end of the sixteenth resistor R16 is connected to an external signal source. The other end of the sixteenth resistor R16 is connected to the positive electrode of the first switching diode DS1 and the base of the first triode Q1. The first negative electrode of the first switching diode DS1 is connected to the output terminal of the second operational amplifier T2. The second negative electrode of the first switching diode DS1 is connected to the current control module 6. The collector of the first triode Q1 is connected to the collector of the second triode Q2, the negative electrode of the second diode D2, and the input terminal of the first sliding resistor SW1, respectively. The emitter of the first triode Q1 is connected to the base of the second triode Q2. The emitter of the second triode Q2 is grounded. The positive electrode of the second diode D2 is connected to one end of the seventeenth resistor R17. The other end of the seventeenth resistor R17 is connected to the base of the third triode Q3 and one end of the eighteenth resistor R18. The other end of the eighteenth resistor R18 is connected to an external signal source. The collector of the third triode Q3 is connected to one end of the nineteenth resistor R19, one end of the twentieth resistor R20, and the collector of the fourth triode Q4. The other end of the nineteenth resistor R19 is connected to an external power supply. The base of the fourth triode Q4 is connected to one end of the twenty-first resistor R21. The other end of the twentieth resistor R20 and the other end of the twenty-first resistor R21 are both grounded. The emitter of the fourth triode Q4 is connected to one end of the fifth capacitor C5. The other end of the fifth capacitor C5 is grounded.

[0050] As described in the above embodiment, the collector of the first triode Q1 arranged in the discharge control module 4 is connected with the input end of the first slide rheostat SW1, and since one end of the sixteenth resistor R16 is connected with an external signal source, it can be understood that the external signal source connected with the sixteenth resistor R16 in the embodiment is actually used to send a discharge control signal to the discharge control module 4, and the discharge control signal is used to be sent to the input end of the first slide rheostat SW1 through the first triode Q1, so as to realize the control of the charge and discharge of the partial capacity battery B1 by adjusting the resistance value of the first slide rheostat SW1. Meanwhile, the other end of the eighteenth resistor R18 is connected with an external signal source, and in the embodiment, the external signal source connected with the eighteenth resistor R18 is actually used to send a start-stop signal to the discharge control module 4 and to the input end of the first slide rheostat SW1, so as to realize the effect of starting the first slide rheostat SW1 and starting the rheostatic effect.

[0051] With reference to Figure 1 , Figure 2 and Figure 4 , in an embodiment, the current control module 6 includes a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a second switch diode DS2, a sixth capacitor C6, and a third operational amplifier T3.

[0052] One end of the twenty-second resistor R22 is connected with an external signal source, the other end of the twenty-second resistor R22 is connected with one end of the twenty-third resistor R23 and one end of the ninth resistor R9, the other end of the twenty-third resistor R23 is connected with the positive input end of the third operational amplifier T3, the negative input end of the third operational amplifier T3 is connected with one end of the twenty-fourth resistor R24 and one end of the sixth capacitor C6, the other end of the twenty-fourth resistor R24 is connected with an external signal source, the other end of the sixth capacitor C6 is connected with the output end of the third operational amplifier T3 and the first positive pole of the second switch diode DS2, the power supply positive input end of the third operational amplifier T3 and the power supply negative input end of the third operational amplifier T3 are both connected with an external power supply, the second positive pole of the second switch diode DS2 is connected with the first negative pole of the first switch diode DS1, the negative pole of the second switch diode DS2 is connected with one end of the twenty-fifth resistor R25, the other end of the twenty-fifth resistor R25 is connected with one end of the twenty-sixth resistor R26, one end of the twenty-seventh resistor R27 and the FB pin of the rectifier voltage reduction conversion chip U1 respectively, the other end of the twenty-sixth resistor R26 is connected with the negative pole of the second diode D2, and the other end of the twenty-seventh resistor R27 is connected with the GND pin.

[0053] As described in the above embodiment, the positive input end of the third operational amplifier T3 is used as a real-time current detection end of the sub-battery B1 and is connected with the external detection circuit, the negative input end of the third operational amplifier T3 is used to obtain the set current signal inputted from outside, and the third operational amplifier T3 outputs the set current signal to the discharge control module 4 through the output end of the third operational amplifier T3, so that the corresponding current control effect is realized, and meanwhile, the output end of the third operational amplifier T3 is also connected with the FB pin of the rectification and step-down conversion chip U1, so that the corresponding input feedback effect is realized.

[0054] The utility model further provides a formation cabinet with the Buck charging circuit, include above described Buck charging circuit.

[0055] It can be known from the above embodiment that the biggest beneficial effect of the utility model lies in that the rectification and step-down conversion chip U1 is used to output the external power supply after step-down to the Buck module, and then output the low-voltage output after the secondary conversion of the Buck module to the sub-battery, so that the corresponding power supply effect is realized, the power consumption of the charging circuit is reduced through twice step-down operation, the problem that the charging mode of the prior art is inefficient and wastes more energy by only using two MOS tubes to realize the charge and discharge control is solved, and the power consumption of the charging circuit is reduced.

[0056] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A Buck charging circuit for performing capacity-classifying and charging of a battery, comprising a Buck module for voltage transformation, a capacity-classifying battery for capacity-classifying and charging, and a rectifier-buck converter chip within the Buck module for buck charging. The IN pin of the rectifier-buck converter chip is connected to an external power supply, the SW pin of the rectifier-buck converter chip is connected to the input terminal of the Buck module, the ground terminal of the Buck module is connected to the GND pin of the rectifier-buck converter chip and grounded, the output terminal of the Buck module is connected to the positive terminal of the capacity-limiting battery, and the negative terminal of the capacity-limiting battery is grounded. The SW pin is also connected to one end of the first resistor, the other end of the first resistor is connected to one end of the first capacitor, the other end of the first capacitor is connected to the BST pin of the rectifier-buck converter chip, the EN pin of the rectifier-buck converter chip is also connected to one end of the second resistor, and the other end of the second resistor is connected to an external signal source. The IN pin is also connected to one end of the third resistor, the other end of the third resistor is connected to one end of the second capacitor and the positive terminal of the first energy storage capacitor, and the negative terminal of the first energy storage capacitor and the other end of the second capacitor are both connected to the GND pin. The Buck module includes a first diode, a fourth resistor, a fifth resistor, an inductor, a third capacitor, and a second energy storage capacitor. The negative terminal of the first diode, one end of the fourth resistor, and one end of the inductor are all connected to the SW pin. The other end of the fourth resistor is connected to one end of the third capacitor. The other end of the third capacitor and the positive terminal of the first diode are both connected to the GND pin. The other end of the inductor is connected to one end of the fifth resistor, the positive terminal of the second energy storage capacitor, and the positive terminal of the cascade battery. The other end of the fifth resistor and the negative terminal of the second energy storage capacitor are grounded.

2. The Buck charging circuit as described in claim 1, characterized in that, A switch control module is connected in series between the Buck module and the capacity-dividing battery. The switch control module includes a first sliding rheostat and a second sliding rheostat. The input terminal of the first sliding rheostat is connected to the other end of the inductor, the output terminal of the first sliding rheostat is connected to the input terminal of the second sliding rheostat, the output terminal of the second sliding rheostat is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the positive terminal of the cascaded battery, and the control terminals of the first and second sliding rheostats are both connected to an external signal source.

3. The Buck charging circuit as described in claim 2, characterized in that, The positive terminal of the capacity-divided battery is also connected to a voltage acquisition module, which includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a first operational amplifier. The positive terminal of the capacity-class battery has two positive input terminals. The seventh resistor is connected in series between the two positive input terminals and is connected to one end of the eighth resistor. The negative terminal of the capacity-class battery has two negative output terminals. The ninth resistor is connected in series between the two negative output terminals, and one end of the ninth resistor is also connected to one end of the tenth resistor. The other end of the tenth resistor is grounded. The other end of the ninth resistor is connected to one end of the eleventh resistor. The other end of the eighth resistor is connected to the positive input terminal of the first operational amplifier and one end of the twelfth resistor. The other end of the eleventh resistor is connected to the negative input terminal of the first operational amplifier and one end of the thirteenth resistor. The positive and negative power input terminals of the first operational amplifier are both connected to an external power supply. The output terminal of the first operational amplifier is connected to the other end of the thirteenth resistor and a preset discharge control module and current control module.

4. The Buck charging circuit as described in claim 3, characterized in that, The output terminal of the first operational amplifier is also connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to the positive input terminal of the second operational amplifier, the negative input terminal of the second operational amplifier is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to an external signal source, a fourth capacitor is connected in series between the negative input terminal and the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected to the discharge control module and the current control module.

5. The Buck charging circuit as described in claim 4, characterized in that, The discharge control module is connected to the switch drive module. The discharge control module includes a sixteenth resistor, a first switching diode, a first transistor, and a second transistor. The switch drive module includes a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a second diode, a fifth capacitor, a third transistor, and a fourth transistor. One end of the sixteenth resistor is connected to an external signal source, and the other end is connected to the anode of the first switching diode and the base of the first transistor. The first cathode of the first switching diode is connected to the output of the second operational amplifier, and the second cathode of the first switching diode is connected to the current control module. The collector of the first transistor is connected to the collector of the second transistor, the cathode of the second diode, and the input of the first variable resistor. The emitter of the first transistor is connected to the base of the second transistor, and the emitter of the second transistor is grounded. The anode of the second diode is connected to the seventeenth resistor. One end of the resistor is connected, the other end of the seventeenth resistor is connected to the base of the third transistor and one end of the eighteenth resistor, the other end of the eighteenth resistor is connected to an external signal source, the collector of the third transistor is connected to one end of the nineteenth resistor, one end of the twentieth resistor and the collector of the fourth transistor, the other end of the nineteenth resistor is connected to an external power supply, the base of the fourth transistor is connected to one end of the twenty-first resistor, the other ends of the twenty-first resistor and the other ends of the twenty-first resistor are both grounded, the emitter of the fourth transistor is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.

6. The Buck charging circuit as described in claim 5, characterized in that, The current control module includes a 22nd resistor, a 23rd resistor, a 24th resistor, a 25th resistor, a 26th resistor, a 27th resistor, a second switching diode, a sixth capacitor, and a third operational amplifier; One end of the 22nd resistor is connected to an external signal source. The other end of the 22nd resistor is connected to one end of the 23rd resistor and one end of the 9th resistor. The other end of the 23rd resistor is connected to the positive input terminal of the third operational amplifier. The negative input terminal of the third operational amplifier is connected to one end of the 24th resistor and one end of the 6th capacitor. The other end of the 24th resistor is connected to an external signal source. The other end of the 6th capacitor is connected to the output terminal of the third operational amplifier and the first positive terminal of the second switching diode. The positive and negative power input terminals of the third operational amplifier are both connected to an external power supply. The second positive terminal of the second switching diode is connected to the first negative terminal of the first switching diode. The negative terminal of the second switching diode is connected to one end of the 25th resistor. The other end of the 25th resistor is connected to one end of the 26th resistor, one end of the 27th resistor, and the FB pin of the rectifier-buck converter chip. The other end of the 26th resistor is connected to the negative terminal of the second diode. The other end of the 27th resistor is connected to the GND pin.

7. A formation cabinet having the Buck charging circuit, characterized in that, Includes the Buck charging circuit as described in any one of claims 1-6.

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