CN111540966B - Voltage reduction circuit, lithium battery dry-conversion battery system and device - Google Patents
Voltage reduction circuit, lithium battery dry-conversion battery system and device Download PDFInfo
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- CN111540966B CN111540966B CN202010654119.6A CN202010654119A CN111540966B CN 111540966 B CN111540966 B CN 111540966B CN 202010654119 A CN202010654119 A CN 202010654119A CN 111540966 B CN111540966 B CN 111540966B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application provides a step-down circuit, lithium cell change dry cell system and device, wherein the step-down circuit includes: the circuit comprises an operational amplifier, a control circuit, a first switch, a second switch, a first inductor, a first capacitor and a resistor proportion control circuit; the first input end of the operational amplifier is connected with a reference voltage, the second input end of the operational amplifier is connected with the resistance proportion control circuit, and the output end of the operational amplifier is connected with the control circuit; the control circuit is used for controlling the first switch and the second switch; one end of the first inductor is connected with the other end of the first switch, and the other end of the first inductor is connected with one end of the first capacitor, the output end of the resistance proportion control circuit and the output end of the voltage reduction circuit; the other end of the first capacitor and the other end of the second switch are connected with a resistance proportion control circuit. This application can make the different voltages of step-down circuit output, and then the lithium cell changes a plurality of voltages of dry battery system output to accord with the characteristic of dry battery voltage.
Description
Technical Field
The application relates to the field of lithium batteries and dry batteries, in particular to a voltage reduction circuit, a lithium battery dry-conversion battery system and a lithium battery dry-conversion battery device.
Background
Currently, the voltage of the dry cell decreases as the capacity of the dry cell decreases, and thus the voltage output from the dry cell varies. The conventional lithium battery dry-conversion battery system can only output one fixed voltage and cannot accord with the characteristics of a dry battery.
Disclosure of Invention
The application provides a voltage reduction circuit and a lithium battery dry-conversion battery system, which aim to solve the problem that the lithium battery dry-conversion battery system in the prior art can only output one fixed voltage;
in order to solve the technical problem, the application adopts a technical scheme that: the voltage reduction circuit of the lithium battery dry battery system is provided, and comprises: the circuit comprises an operational amplifier, a control circuit, a first switch, a second switch, a first inductor, a first capacitor and a resistor proportion control circuit;
a first input end of the operational amplifier is connected with a reference voltage, a second input end of the operational amplifier is connected with the resistance proportion control circuit, an output end of the operational amplifier is connected with the control circuit, and the control circuit is used for controlling the first switch and the second switch;
one end of the first switch is connected with an input voltage, the other end of the first switch is connected with one end of the second switch, the other end of the second switch is grounded, one end of the first inductor is connected with the other end of the first switch, the other end of the first inductor is connected with one end of the first capacitor, the resistance proportion control circuit and the output end of the voltage reduction circuit, and the other end of the first capacitor and the other end of the second switch are connected with the resistance proportion control circuit;
in order to solve the above technical problem, another technical solution adopted by the present application is: the utility model provides a lithium cell changes dry battery system, it includes the module of charging, the module of discharging, charge-discharge detection module, lithium cell protection module and lithium cell module, wherein:
the input and output end of the lithium battery dry-conversion battery system is coupled with the first input end of the charging module, the output end of the discharging module and the first input end of the charging and discharging detection module;
the first output end of the charge and discharge detection module is coupled with the second input end of the charge module, and the second output end of the charge and discharge detection module is coupled with the second input end of the discharge module;
the lithium battery protection module is coupled with the output end of the charging module, the first input end of the discharging module and the second input end of the charging and discharging detection module; the lithium battery protection module is coupled with the lithium battery module;
the discharging module comprises the voltage reducing circuit;
the application also provides a device for drying the lithium battery, which comprises the voltage reduction circuit;
the beneficial effects of the embodiment of the application are that: be different from prior art, the voltage reduction circuit of this application can select different proportional resistance through setting up resistance proportional control circuit to make voltage reduction circuit output different voltages, and then the lithium cell changes the voltage that a plurality of voltages of dry battery system output or continuously change, with the characteristic that accords with dry battery voltage.
Drawings
The above features, technical features, advantages and implementations of the voltage step-down circuit and the lithium battery dry cell system will be further described in the following detailed description of preferred embodiments with reference to the accompanying drawings;
FIG. 1 is a circuit diagram of an embodiment of a buck circuit of the present application;
FIG. 2 is a circuit diagram of another embodiment of a buck circuit of the present application;
FIG. 3 is a circuit diagram of another embodiment of a voltage step-down circuit of the present application;
FIG. 4 is a circuit diagram of another embodiment of a buck circuit of the present application;
FIG. 5 is a circuit diagram of one embodiment of the resistance ratio control circuit of FIG. 1;
FIG. 6 is a circuit diagram of one embodiment of the reference voltage selection circuit of FIG. 2;
FIG. 7 is a circuit diagram of another embodiment of the reference voltage selection circuit of FIG. 2;
fig. 8 is a schematic structural diagram of an embodiment of a lithium battery drying battery system according to the present application.
Detailed Description
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the present application, and that for a person skilled in the art, other drawings and other embodiments can be obtained from these drawings without inventive effort;
for the sake of simplicity, the drawings only schematically show the parts relevant to the present application, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "a" means not only "only one of this kind," but also a case of "more than one of this kind";
as shown in fig. 1, the present application provides a circuit diagram of an embodiment of a voltage reduction circuit, which can be applied to a lithium battery dry cell system, including: the circuit comprises an operational amplifier 10, a control circuit 11, a first switch S1, a second switch S2, a first inductor L1, a first capacitor C1 and a resistance ratio control circuit 12;
a first input end (positive input end) of the operational amplifier 10 is connected to a reference voltage VREF, a second input end (negative input end) of the operational amplifier 10 is connected to the resistance ratio control circuit 12, an output end of the operational amplifier 10 is connected to the control circuit 11, and the control circuit 11 is used for controlling the first switch S1 and the second switch S2. One end of the first switch S1 is connected to the voltage of the input terminal IN of the step-down circuit, the other end of the first switch S1 is connected to one end of the second switch S2, and the other end of the second switch S2 is grounded; one end of the first inductor L1 is connected to the other end of the first switch S1, the other end of the first inductor L1 is connected to one end of the first capacitor C1, the output terminal OUT of the resistance ratio control circuit 12 and the step-down circuit, and the other end of the first capacitor C1 and the other end of the second switch S2 are connected to the resistance ratio control circuit 12;
the voltage reduction circuit of the embodiment can select different proportional resistors by arranging the resistor proportional control circuit 12, and the voltage reduction circuit outputs different voltages by adjusting the resistor proportional control circuit 12, so that the lithium battery dry cell system outputs a plurality of voltages to accord with the characteristics of dry cell voltage, and the lithium battery discharge function can be realized in the lithium battery dry cell system;
as shown in fig. 2, the present application provides a circuit diagram of another embodiment of a voltage reduction circuit, which is applied to a lithium battery dry cell system, and compared with the voltage reduction circuit shown in fig. 1, the difference is that: the step-down circuit further includes a reference voltage selection circuit 13, the reference voltage selection circuit 13 being configured to output a reference voltage VREF;
a first input end of the operational amplifier AMP1 is connected to the reference voltage selection circuit 13, and is used for accessing the reference voltage VREF output by the reference voltage selection circuit 13; one end of the reference voltage selection circuit 13 is connected with the first switch S1 and the voltage connected to the input terminal IN of the step-down circuit, and the other end of the reference voltage selection circuit 13 is grounded;
the reference voltage selection circuit 13 may be configured to output at least two reference voltages VREF, that is, the operational amplifier AMP1 receives at least two reference voltages, and at least two output voltages of the voltage reduction circuit of the corresponding lithium battery dry cell system may also appear;
in this embodiment, the reference voltage selection circuit 13 can output different reference voltages VREF, and the resistance ratio control circuit 12 selects different resistance ratios, so that the voltage reduction circuit outputs different voltages;
as shown in fig. 3, the present application provides a circuit diagram of another embodiment of a voltage-reducing circuit, which is different from the voltage-reducing circuit shown in fig. 2 in that: the reference voltage selection circuit 13 of the voltage reduction circuit at least comprises a third resistor R3 and a fourth resistor R4, wherein one end of the fourth resistor R4 is connected with one end of the first switch S1 and the input end IN of the voltage reduction circuit, the other end of the fourth resistor R4 is connected with a first input end (positive input end) of an operational amplifier AMP1 and one end of a third resistor R3, and the other end of the third resistor R3 is grounded;
the resistance ratio control circuit 12 at least comprises a first resistor R1 and a second resistor R2, wherein one end of the second resistor R2 is connected to the other end of the first inductor L1, the other end of the second resistor R2 is connected to a second input end (negative input end) of the operational amplifier AMP1 and one end of a first resistor R1, and the other end of the first resistor R1 is connected to the other end of the first capacitor C1 and is grounded;
IN the embodiment, through the third resistor R3 and the fourth resistor R4, when the voltage of the output end OUT of the voltage reduction circuit is lower than a preset value, that is, the voltage VFB is lower than the reference voltage VREF, VFB is a voltage value obtained by dividing the voltage of the output end OUT through the resistor R1 and the resistor R2, the operational amplifier AMP1 outputs a high level, the operational amplifier AMP1 controls the first switch S1 to be connected and the second switch S2 to be disconnected through the control circuit 11, at this time, the voltage of the input end IN of the voltage reduction circuit charges the first capacitor C1, and the voltage of the output end OUT of the voltage reduction circuit increases;
when the voltage at the output end OUT of the voltage reduction circuit increases to be higher than the preset value, that is, the voltage VFB is greater than the reference voltage VREF, the operational amplifier AMP1 outputs a low level, the operational amplifier AMP1 controls the first switch S1 to be disconnected and the second switch S2 to be connected through the control circuit 11, at this time, the first capacitor C1 discharges, and the voltage at the output end OUT of the voltage reduction circuit decreases. When the voltage of the output end OUT of the voltage reduction circuit is reduced to be lower than a preset value, repeating the above change to stabilize the average voltage of the output end OUT of the voltage reduction circuit at the preset value;
wherein, the voltage of the output OUT of the step-down circuit is linearly changed along with the voltage of the input IN of the step-down circuit, namely, the voltage of the output OUT of the step-down circuit is along with the voltage of the input IN of the step-down circuit to satisfy the following formula:
in the formula VOUTIs the voltage value, V, output by the voltage-reducing circuitINIs the voltage value of the input terminal IN of the voltage reduction circuit, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and R4 is the resistance value of the fourth resistor;
equation (1) can be modified as:
as can be obtained from the formula (2), by adjusting the ratio of the first resistor R1 to the second resistor R2 or the ratio of the third resistor R3 to the fourth resistor R4, different ratios can be obtained, and the output voltage V is obtainedOUTThe characteristics of the traditional dry battery are more similar;
as shown in fig. 4, the present application provides another embodiment of a voltage-reducing circuit, which is different from the voltage-reducing circuit shown in fig. 3 in that: the reference voltage selection circuit 13 of the voltage reduction circuit further includes a fifth resistor R5, a sixth resistor R6, a first comparator COMP1, a third switch S3, and a fourth switch S4;
one end of the sixth resistor R6 is connected to one end of the fourth resistor R4, the other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and a first input end (positive input end) of the first comparator COMP1, and a second input end (negative input end) of the first comparator COMP1 is connected to a first reference voltage VREF 1; the other end of the fifth resistor R5 is grounded, and the first comparator COMP1 is configured to control the third switch S3 and the fourth switch S4, i.e., is connected to the control terminal of the third switch S3 and the control terminal of the fourth switch S4, respectively;
one end of the third switch S3 is connected to the other end of the fourth resistor R4, one end of the third switch S3 and the other end of the fourth switch S4 are connected to a first input terminal (positive input terminal) of the operational amplifier AMP1, and one end of the fourth switch S4 is connected to the second reference voltage VREF2;
when the voltage of the input end IN of the voltage reduction circuit is greater than the first preset voltage, the voltage of the output end OUT of the voltage reduction circuit is a fixed voltage; when the voltage of the input end IN of the voltage reduction circuit is smaller than a second preset voltage, the voltage of the output end OUT of the voltage reduction circuit changes along with the voltage of the input end IN of the voltage reduction circuit;
the first comparator COMP1 is used for comparing the input voltage Vfb _ IN with the first reference voltage VREF1, and satisfies the following formula:
Vfb_IN=VIN*（R6+R5）/R5
IN the formula, VIN is the voltage at the input end IN of the voltage reduction circuit, Vfb _ IN is the voltage value of the input end IN of the voltage reduction circuit after the voltage R6 is divided, R5 is the resistance value of the fifth resistor, and R6 is the resistance value of the sixth resistor;
wherein, VREF1 is the voltage generated in the lithium battery dry-conversion battery system;
when the voltage at the input terminal IN of the step-down circuit is greater than VREF1 (R6 + R5)/R5 (i.e., Vfb _ IN is greater than the first preset voltage), the output of the first comparator COMP1 controls the third switch S3 to be turned on and the fourth switch S4 to be turned off, and the positive input terminal of the operational amplifier AMP1 is connected between the fourth resistor R4 and the third resistor R3 through the third switch S3, where the function of the step-down circuit IN fig. 4 is equivalent to that IN fig. 3. The reference voltage at the positive input terminal of the operational amplifier AMP1 satisfies the following equation:
when the voltage of the input IN of the voltage reduction circuit is less than or equal to VREF1 (R6 + R5)/R5 (i.e. Vfb _ I)N is less than or equal to a first preset voltage), the output of the first comparator COMP1 controls the third switch S3 to be disconnected and the fourth switch S4 to be connected, the second reference voltage VREF2 connected with the fourth switch S4 is connected to the positive input end of the operational amplifier AMP1, and the voltage V of the output end OUT of the voltage reduction circuit at the momentOUTThe following formula is satisfied:
in the formula VOUTIs the voltage of the output terminal OUT of the voltage reduction circuit, VREF2 is the second reference voltage, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor;
fig. 5 is the resistance ratio control circuit in fig. 1 and 2, and the resistance ratio control circuit 12 may include n +1 tenth resistors, n +1 eleventh resistors, n seventh switches, and n fourth comparators, where n is an integer greater than or equal to 2. The n +1 tenth resistors are connected in series, the n +1 eleventh resistors are connected in series, and the n +1 tenth resistors and the n +1 eleventh resistors are connected in parallel. In the present embodiment, the tenth resistor R11 to the tenth resistor R1N +1 are connected in series, the eleventh resistor R21 to the eleventh resistor R2N +1 are connected in series, and the tenth resistor R11 to the tenth resistor R1N +1 after being connected in series are connected in parallel with the eleventh resistor R21 to the eleventh resistor R2N +1 after being connected in series;
the second input end (negative input end) of the n fourth comparators is connected to a sixth reference voltage VREF6, the first input end (positive input end) of the nth fourth comparator is connected between the nth tenth resistor and the (n + 1) th tenth resistor, the output end of the nth fourth comparator is connected to the control end of the nth seventh switch, one end of the nth seventh switch is connected between the nth eleventh resistor and the (n + 1) th eleventh resistor, and the other end of the nth seventh switch is connected to the second input end (negative input end) of the operational amplifier AMP1 and is used for outputting a voltage VFB. That is, the second input terminals (negative input terminals) of the fourth comparators COPM11 to COMP1N are all connected to the sixth reference voltage VREF6, the first input terminal (positive input terminal) of the fourth comparator COPM11 is connected between the 1 st tenth resistor R11 and the 2 nd tenth resistor R12, and the first input terminal of the fourth comparator COPM1N is connected between the nth tenth resistor R1N and the n +1 th tenth resistor R1N + 1; one end of the 1 st seventh switch S11 is connected between the 1 st eleventh resistor R21 and the 2 nd eleventh resistor R22, and one end of the nth seventh switch S1N is connected between the nth eleventh resistor R2N and the n +1 th eleventh resistor R2N + 1;
in the embodiment, the resistance proportion control circuit 12 is adjusted to enable the voltage reduction circuit to output different voltages, so that the lithium battery dry cell system outputs a plurality of voltages to meet the characteristics of dry cell voltage, namely, the lithium battery dry cell system realizes the lithium battery discharge function;
as shown in fig. 6, is a circuit diagram of the reference voltage selection circuit 13 in the step-down circuit shown in fig. 2;
the reference voltage selection circuit 13 may include n +1 eighth resistors, n +1 ninth resistors, n sixth switches, and n third comparators, where n is an integer greater than or equal to 2. n +1 eighth resistors are connected in series, n +1 ninth resistors are connected in series, and n +1 eighth resistors and n +1 ninth resistors are connected in parallel; in the present embodiment, the eighth resistor R31 to the eighth resistor R3N +1 are connected in series, the ninth resistor R41 to the ninth resistor R4N +1 are connected in series, and the series-connected eighth resistor R31 to the eighth resistor R3N +1 are connected in parallel with the series-connected ninth resistor R41 to the ninth resistor R4N + 1;
the second input end (negative input end) of the n third comparators is connected to a fourth reference voltage VREF4, the first input end (positive input end) of the nth third comparator is connected between the nth eighth resistor and the (n + 1) th eighth resistor, the output end of the nth third comparator is connected to the control end of the nth sixth switch, one end of the nth sixth switch is connected between the nth ninth resistor and the (n + 1) th ninth resistor, and the other end of the nth sixth switch is connected to the first input end (positive input end) of the operational amplifier 10 and is used for outputting the internal voltage VREF. That is, the second input (negative input) terminals of the third comparator COPM21 to the third comparator COMP2N are all connected to the fourth reference voltage VREF4, the first input terminal of the third comparator COPM21 is connected between the 1 st eighth resistor R31 and the 2 nd eighth resistor R32, and the first input terminal of the third comparator COPM2N is connected between the nth eighth resistor R3N and the n +1 th eighth resistor R3N + 1; one end of the 1 st sixth switch S21 is connected between the 1 st ninth resistor R41 and the 2 nd ninth resistor R42, and one end of the nth sixth switch S2N is connected between the nth ninth resistor R4N and the n +1 th ninth resistor R4N + 1;
in the range of battery voltage operation, the reference voltage selection circuit 13 of this embodiment may have 2 or more than 2 types of reference voltages VREF output, that is, the value of VREF may have 2 or more than 2 types;
as shown in fig. 7, another circuit diagram of the reference voltage selection circuit 13 in the step-down circuit shown in fig. 2 is shown. The reference voltage selection circuit 13 includes n +1 seventh resistors, n fifth switches, and n second comparators, where n is an integer greater than or equal to 2;
wherein, n +1 seventh resistors are connected in series, i.e. the seventh resistor R51 to the seventh resistor R5N +1 are connected in series; second input ends (negative input ends) of the n second comparators are connected to a third reference voltage VREF3, first input ends (positive input ends) of the n second comparators COMP3N are connected between an nth seventh resistor R5N and an n +1 seventh resistor R5N + 1, an output end of the n second comparator COMP3N is connected with a control end of an nth fifth switch S3N, one end of the nth fifth switch S3N is connected with a fifth reference voltage VREF1N, and the other end of the nth fifth switch S3N is connected with a first input end (positive input end) of an operational amplifier AMP 1;
in the range of battery voltage operation, the reference voltage selection circuit of this embodiment may have 2 or more than 2 types of reference voltages VREF output, that is, the value of VREF may have 2 or more than 2 types;
as shown in fig. 8, the lithium battery dry-conversion battery system disclosed in this embodiment includes a charging module 81, a discharging module 82, a charging and discharging detection module 83, a lithium battery protection module 84, and a lithium battery module 85, where the discharging module 82 includes the voltage-reduction circuit disclosed in the above embodiment;
the input/output end INOUT of the lithium battery dry-to-dry battery system is coupled to the first input end of the charging module 81, the output end of the discharging module 82, and the first input end of the charging/discharging detection module 83; a first output end D1 of the charge and discharge detection module 83 is coupled to a second input end of the charging module 81, and a second output end D2 of the charge and discharge detection module 83 is coupled to a second input end of the discharging module 82; an input/output end BINOUT of the lithium battery protection module 84 is coupled to an output end of the charging module 81, a first input end of the discharging module 82, and a second input end of the charging/discharging detection module 83; the input/output terminal BINOUT1 of the lithium battery protection module 84 is coupled to the input/output terminal of the lithium battery module 85; the lithium battery protection module 84 is further configured to control and conduct a charging path and a discharging path, where the charging path includes a charging module 81, a lithium battery protection module 84, and a lithium battery module 85, and the discharging path includes a discharging module 82, a lithium battery protection module 84, and a lithium battery module 85;
when the voltage of the input and output end INOUT of the lithium battery drying battery system is greater than the voltage of the lithium battery module 85, the first output signal D1 of the charge and discharge detection module 83 outputs a high level, and the second output signal D2 of the charge and discharge detection module 83 outputs a low level, at this time, the discharge module 82 stops working, the charge module 81 charges the lithium battery module 85 according to the input voltage of the lithium battery drying battery system, and the lithium battery module 85 stores energy;
when the voltage of the lithium battery dry battery system is less than the voltage of the lithium battery module 85, the first output signal D1 of the charge and discharge detection module 83 outputs a low level, the second output signal D2 of the charge and discharge detection module 83 outputs a high level, at this time, the charge module 81 does not work, the discharge module 82 discharges and outputs the voltage of the lithium battery module 85, and the lithium battery module 85 consumes energy;
when the lithium battery protection module 84 detects that the voltage of the lithium battery module 85 is higher than the third preset voltage, the lithium battery protection module 84 disconnects the charging path between the charging module 81 and the lithium battery module 85; when the lithium battery protection module 84 detects that the voltage of the lithium battery module 85 is lower than the fourth preset voltage, the lithium battery protection module 84 disconnects a discharge path between the discharge module 82 and the lithium battery module 85 to protect the lithium battery module 85;
the application also provides a device for drying the lithium battery, which comprises the voltage reduction circuit;
it should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A voltage step-down circuit, comprising: the circuit comprises an operational amplifier, a control circuit, a first switch, a second switch, a first inductor, a first capacitor and a resistor proportion control circuit;
a first input end of the operational amplifier is connected with a reference voltage, a second input end of the operational amplifier is connected with the resistance proportion control circuit, an output end of the operational amplifier is connected with the control circuit, and the control circuit is used for controlling the first switch and the second switch;
one end of the first switch is connected with an input voltage, the other end of the first switch is connected with one end of the second switch, the other end of the second switch is grounded, one end of the first inductor is connected with the other end of the first switch, the other end of the first inductor is connected with one end of the first capacitor, the resistance proportion control circuit and the output end of the voltage reduction circuit, and the other end of the first capacitor and the other end of the second switch are connected with the resistance proportion control circuit;
the resistance proportion control circuit comprises n +1 tenth resistors, n +1 eleventh resistors, n seventh switches and n fourth comparators, wherein n is an integer greater than or equal to 2; n +1 tenth resistors are connected in series, n +1 eleventh resistors are connected in series, and the n +1 tenth resistors and the n +1 eleventh resistors are connected in parallel; the second input ends of the n fourth comparators are connected to a sixth reference voltage, the first input end of the nth fourth comparator is connected between the nth tenth resistor and the n +1 th tenth resistor, the output end of the nth fourth comparator is connected with the control end of the nth seventh switch, one end of the nth seventh switch is connected between the nth eleventh resistor and the n +1 th eleventh resistor, and the other end of the nth seventh switch is connected with the second input end of the operational amplifier.
2. The voltage reducing circuit according to claim 1, wherein the resistance ratio control circuit comprises at least a first resistor and a second resistor, one end of the second resistor is connected to the other end of the first inductor, the other end of the second resistor is connected to the second input terminal of the operational amplifier and one end of the first resistor, and the other end of the first resistor is connected to the other end of the first capacitor.
3. The buck circuit according to claim 1, further comprising a reference voltage selection circuit coupled to the first input of the operational amplifier for outputting the reference voltage.
4. The voltage reduction circuit according to claim 3, wherein the reference voltage selection circuit comprises at least a third resistor and a fourth resistor; one end of the fourth resistor is connected with one end of the first switch and the input end of the voltage reduction circuit, the other end of the fourth resistor is connected with the first input end of the operational amplifier and one end of the third resistor, and the other end of the third resistor is grounded.
5. The voltage reduction circuit according to claim 4, wherein the reference voltage selection circuit further comprises a first comparator, a fifth resistor, a sixth resistor, a third switch, and a fourth switch; one end of the sixth resistor is connected with one end of the fourth resistor, the other end of the sixth resistor is connected with one end of the fifth resistor and the first input end of the first comparator, and the second input end of the first comparator is connected with a first reference voltage; the other end of the fifth resistor is grounded; the first comparator is used for controlling the third switch and the fourth switch, namely, the first comparator is respectively connected with a control end of the third switch and a control end of the fourth switch, one end of the third switch is connected with the other end of the fourth resistor, the other end of the third switch and the other end of the fourth switch are connected with the first input end of the operational amplifier, and one end of the fourth switch is connected with a second reference voltage.
6. The voltage reduction circuit according to claim 4, wherein the reference voltage selection circuit includes n +1 seventh resistors, n fifth switches, and n second comparators, n being an integer equal to or greater than 2; the n +1 seventh resistors are connected in series, the second input ends of the n second comparators are connected to a third reference voltage, the first input end of the nth second comparator is connected between the nth seventh resistor and the n +1 seventh resistor, the output end of the nth second comparator is connected to the control end of the nth fifth switch, one end of the nth fifth switch is connected to a fifth reference voltage, and the other end of the nth fifth switch is connected to the first input end of the operational amplifier.
7. The voltage reduction circuit according to claim 4, wherein the reference voltage selection circuit includes n +1 eighth resistors, n +1 ninth resistors, n sixth switches, and n third comparators, n being an integer greater than or equal to 2; n +1 of the eighth resistors are connected in series, n +1 of the ninth resistors are connected in series, and the n +1 of the eighth resistors and the n +1 of the ninth resistors are connected in parallel; the second input ends of the n third comparators are connected to a fourth reference voltage, the first input end of the nth third comparator is connected between the nth eighth resistor and the n +1 th eighth resistor, the output end of the nth third comparator is connected with the control end of the nth sixth switch, one end of the nth sixth switch is connected between the nth ninth resistor and the n +1 th ninth resistor, and the other end of the nth sixth switch is connected with the first input end of the operational amplifier.
8. The utility model provides a lithium cell changes dry battery system which characterized in that, lithium cell changes dry battery system includes the module of charging, the module of discharging, charge-discharge detection module, lithium cell protection module and lithium cell module, wherein:
the input and output end of the lithium battery dry-conversion battery system is coupled with the first input end of the charging module, the output end of the discharging module and the first input end of the charging and discharging detection module;
the first output end of the charge and discharge detection module is coupled with the second input end of the charge module, and the second output end of the charge and discharge detection module is coupled with the second input end of the discharge module;
the lithium battery protection module is coupled with the output end of the charging module, the first input end of the discharging module and the second input end of the charging and discharging detection module; the lithium battery protection module is coupled with the lithium battery module;
wherein the discharge module comprises the voltage step-down circuit of any one of claims 1-7.
9. An apparatus for turning a lithium battery into a dry battery, the apparatus comprising the voltage reduction circuit of any one of claims 1 to 7.
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| CN202010654119.6A CN111540966B (en) | 2020-07-09 | 2020-07-09 | Voltage reduction circuit, lithium battery dry-conversion battery system and device |
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| CN202010654119.6A CN111540966B (en) | 2020-07-09 | 2020-07-09 | Voltage reduction circuit, lithium battery dry-conversion battery system and device |
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| CN106487073B (en) * | 2016-12-13 | 2021-01-12 | 合肥中感微电子有限公司 | Power supply circuit and electronic equipment |
| CN210577832U (en) * | 2019-06-15 | 2020-05-19 | 上海来远电子科技有限公司 | Lithium cell simulation dry battery output structure |
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