CN219801914U - Adjustable constant-current constant-voltage charging control device - Google Patents
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- 238000010281 constant-current constant-voltage charging Methods 0.000 title claims abstract description 55
- 238000007600 charging Methods 0.000 claims abstract description 123
- 238000005070 sampling Methods 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 8
- 229910001416 lithium ion Inorganic materials 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 5
- 238000010280 constant potential charging Methods 0.000 description 10
- 238000010277 constant-current charging Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
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- 239000002253 acid Substances 0.000 description 1
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- 238000007667 floating Methods 0.000 description 1
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Abstract
The utility model provides an adjustable constant-current constant-voltage charging control device, and relates to the technical field of constant-current constant-voltage charging control. The utility model provides an adjustable constant-current constant-voltage charging control device, which comprises a charging current sampling resistor, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit, wherein the charging current sampling resistor is connected with the first operational amplifier; the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with a charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel; the output ends of the first operational amplifier and the charging current and voltage regulating module are connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with the main power topology circuit; the main power topology circuit is connected with the storage battery pack. The adjustable constant-current constant-voltage charging control device improves the adjustment flexibility of constant-current constant-voltage charging control.
Description
Technical Field
The utility model relates to the technical field of constant-current constant-voltage charge control, in particular to an adjustable constant-current constant-voltage charge control device.
Background
As one of the novel green energy sources in the field of aviation batteries, the lithium ion storage battery gradually replaces the position of a lead-acid battery in the field of aviation storage batteries. In order to meet the power consumption requirement of a large-power and long-service-life low-orbit small spacecraft platform, a constant-current and constant-voltage charging design is required to be carried out on a lithium ion storage battery pack, and the fact proves that constant-current and constant-voltage charging control is the most common and most suitable charging control mode, and the storage battery can have a stable and good working state by the mode, so that the safe and reliable working of a power supply system is ensured, and the normal and safe running of a spacecraft is further ensured.
The existing constant-current constant-voltage charging control technology of the lithium ion storage battery pack is mature, but the charging current and the final charging voltage are fixed when being set, and the current and the final charging voltage cannot be flexibly changed according to actual needs. The service life of the lithium ion storage battery pack is directly influenced by too large charging current and too high final charging voltage, and the safety of a spacecraft is threatened by small charging current and low final charging voltage, which restrict energy stability and energy deficiency.
However, with the gradual trend of miniaturization and light weight of aerospace products, the requirements of simplification and activation of charge control are further improved, so that it is highly desirable to provide an adjustable constant-current constant-voltage charge control technology to improve the flexibility of constant-current constant-voltage charge control so as to better meet the use requirements of aerospace batteries.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides an adjustable constant-current constant-voltage charging control device, which solves the problem of poor flexibility of the constant-current constant-voltage charging control technology in the prior art.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the utility model provides an adjustable constant-current constant-voltage charging control device, which comprises:
the charging circuit comprises a charging current sampling resistor, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit:
the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with the charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel;
the output ends of the first operational amplifier and the charging current and voltage regulating module are both connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with a main power topology circuit; the main power topology circuit is connected with the storage battery pack.
Preferably, the apparatus further comprises:
and the input end of the charging protection control module is connected with the storage battery in parallel, and the output end of the charging protection control module is connected with the main power topology circuit.
Preferably, the constant current and constant voltage charge control circuit includes:
a first P I controller, a sawtooth generator, a second operational amplifier, and a driving circuit; and the output ends of the first PI controller and the sawtooth wave generator are both connected with the input end of the second operational amplifier, the output end of the second operational amplifier is connected with the driving circuit, and the output end of the driving circuit is connected with the main power topology circuit.
Preferably, the main power topology circuit includes:
the bus, and the relay, the PMOS tube, the inductor and the Schottky diode are sequentially connected in series according to the current flow direction in the bus; and the output end of the Schottky diode D2 is connected with a storage battery.
Preferably, the main power topology circuit is a BUCK type circuit.
Preferably, the charging current voltage adjustment module includes:
the charging control device comprises a voltage conversion circuit, a second PI controller, a voltage reference injection unit, a current reference injection unit, a maximum current limiting unit and a charging termination control unit; the input end of the voltage conversion circuit is connected with the storage battery in parallel, the output end of the voltage conversion circuit is connected with the input end of the second PI controller, the output end of the second PI controller, the current reference injection unit, the maximum current limiting unit and the charging termination control unit form an AND gate circuit, and the output end of the gate circuit is connected with the first PI controller.
Preferably, the output end of the second PI controller, the charging termination control unit, the maximum current limiting unit, and the circuit between the current reference injection unit and the first PI controller are all connected in series with a fast recovery diode.
Preferably, the charge protection control module includes:
the third operational amplifier, the comparison circuit and the driving unit; the input end of the third operational amplifier is connected with the charging current sampling resistor in parallel, the output end of the third operational amplifier is connected with the input end of the comparison circuit, the input end of the comparison circuit is connected with the driving unit, and the driving unit is connected with the relay in the main power topology circuit.
Preferably, the relay is a magnetic latching relay.
Preferably, the storage battery pack is formed by connecting a plurality of lithium ion storage battery packs in series.
(III) beneficial effects
The utility model provides an adjustable constant-current constant-voltage charging control device. Compared with the prior art, the method has the following beneficial effects:
1. the utility model provides an adjustable constant-current constant-voltage charging control device, which comprises a charging current sampling resistor, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit, wherein the charging current sampling resistor is connected with the first operational amplifier; the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with a charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel; the output ends of the first operational amplifier and the charging current and voltage regulating module are connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with the main power topology circuit; the main power topology circuit is connected with the storage battery pack. The adjustable constant-current constant-voltage charging control device improves the adjustment flexibility of constant-current constant-voltage charging control, and can better meet the use requirement of the space battery.
2. According to the utility model, the charging current and the charging final voltage can be flexibly changed and set through the charging current and voltage regulating module, the constant-current and constant-voltage charging control device is adjustable, and the operation flexibility of the constant-current and constant-voltage charging control device is ensured.
3. The utility model adopts the BUCK step-down topology circuit to charge the storage battery, and the whole device has small volume, light weight, simple operation implementation and control, and miniaturization and light weight of the product are realized under the condition of not sacrificing the efficiency.
4. The charging protection control module of the utility model enables the adjustable constant-current constant-voltage charging control device to have a charging protection function, and can cut off charging when the final charging voltage is not controlled or the charging current is not controlled, thereby ensuring the safety of the storage battery.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an adjustable constant-current constant-voltage charging control device according to the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The embodiment of the utility model solves the problem of poor flexibility of the constant-current constant-voltage charge control technology in the prior art by providing the adjustable constant-current constant-voltage charge control device, and achieves the aim of meeting various use requirements of the space battery by flexibly adjusting the charge control device.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1:
the utility model firstly proposes an adjustable constant-current constant-voltage charging control device, see fig. 1, which comprises:
the charging circuit comprises a charging current sampling resistor, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit;
the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with the charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel;
the output ends of the first operational amplifier and the charging current and voltage regulating module are both connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with a main power topology circuit; the main power topology circuit is connected with the storage battery pack.
It can be seen that the adjustable constant-current constant-voltage charging control device provided in this embodiment includes a charging current sampling resistor, a first operational amplifier, a charging current voltage adjusting module, and a constant-current constant-voltage charging control circuit; the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with a charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel; the output ends of the first operational amplifier and the charging current and voltage regulating module are connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with the main power topology circuit; the main power topology circuit is connected with the storage battery pack. The adjustable constant-current constant-voltage charging control device improves the adjustment flexibility of constant-current constant-voltage charging control, and can better meet the use requirement of the space battery.
The implementation of one embodiment of the present utility model will be described in detail below with reference to fig. 1, and a functional explanation of specific structures and electronic components.
As shown in fig. 1, the adjustable constant-current constant-voltage charging control device provided in this embodiment includes:
the charging circuit comprises a charging current sampling resistor R1, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit.
The charging current sampling resistor R1 is connected in series with the storage battery pack to be charged (B1-Bn represents that n sections of lithium ion storage battery packs are connected in series), so that the charging control device can sample the charging current in the storage battery pack conveniently.
The input end of the first operational amplifier F1 is connected with a charging current sampling resistor R1 and is used for amplifying the collected charging current in the storage battery pack.
The input end of the charging current and voltage regulating module is connected with the storage battery in parallel and is used for regulating the charging current and the charging voltage in the adjustable constant-current constant-voltage charging control device.
The charging current and voltage regulating module comprises a voltage conversion circuit, a second PI controller, a voltage reference injection unit, a current reference injection unit, a maximum current limiting unit and a charging termination control unit. The input end of the voltage conversion circuit is connected with the storage battery in parallel, the collected voltage of the storage battery is converted, the output end of the voltage conversion circuit is connected with the input end of the second PI controller, the output end of the second PI controller, the current reference injection unit, the maximum current limiting unit and the charging termination control unit form an AND gate circuit, and the output end of the AND gate circuit is connected with the first PI controller. And, the output end of the second PI controller, the charging termination control unit, the maximum current limiting unit, and the current reference injection unit are connected in series with fast recovery diodes (D3, D4, D5, D6 respectively) on the circuit between the first PI controller, which are used as on switches. The fast recovery diode has the advantages of good switching characteristic, short reverse recovery time, large forward current, small volume, simple installation and the like. In addition, the voltage reference injection unit is connected with the second PI controller, and the function of adjusting the final charging voltage can be achieved by adjusting the voltage reference injection V4 of the voltage reference injection unit.
The output ends of the first operational amplifier and the charging current and voltage regulating module are both connected with the input end of the constant-current and constant-voltage charging control circuit, the output end of the constant-current and constant-voltage charging control circuit is connected with the main power topology circuit, and the main power topology circuit is connected with the storage battery pack to charge the storage battery pack.
The constant-current constant-voltage charging control circuit comprises a first PI controller, a sawtooth wave generator, a second operational amplifier F2 and a driving circuit, wherein the output ends of the first PI controller and the sawtooth wave generator are connected with the input end of the second operational amplifier F2, the output end of the second operational amplifier F2 is connected with the driving circuit, and the output end of the driving circuit is connected with the main power topology circuit. In this embodiment, the main power topology circuit adopts a simple BUCK form to realize charging of the lithium ion battery pack. Specifically, the main power topology circuit comprises a busbar connected with voltage, a relay J1, a PMOS tube P1, an inductor L and a Schottky diode D2 which are sequentially connected in series according to the current flow direction, and the output end of the Schottky diode D2 is connected with the storage battery. Since the BUCK circuit is a step-down circuit, the adjustable constant-current constant-voltage charge control device in the present embodiment is only applicable to the case where the bus is higher than the battery voltage.
In addition, in order to carry out overcharge protection in the charging process, the adjustable constant-current constant-voltage charging control device that this embodiment provided still includes: and the charging protection control module is used for starting charging protection control when the charging is not controlled.
The charging protection control module comprises a third operational amplifier F3, a comparison circuit and a driving unit. The input end of the third operational amplifier F3 is connected with the charging current sampling resistor R1 in parallel, the output end of the third operational amplifier F3 is connected with the input end of the comparison circuit, the input end of the comparison circuit is connected with the driving unit, and the driving unit acts on the main power topology circuit, and specifically acts on the relay J1 in the main power topology power loop.
In addition, in order to optimize the functions and performances of the whole circuit, the internal circuit of the adjustable constant-current constant-voltage charging control device provided by the embodiment further comprises other resistors R2-R12 and a schottky diode D1, and specific connection modes and positions of the resistors and the schottky diode D1 in the circuit are shown in fig. 1.
The following describes the adjustable constant-current constant-voltage charging control principle with the adjustable constant-current constant-voltage charging control device provided by the embodiment.
(1) Constant current charging control theory of operation.
The voltage at two ends of R1 is collected and amplified to be a voltage V1, the voltage V1 is compared with the voltage V2, the voltage is regulated by a first PI controller to form stable voltage, the stable voltage is compared with the output voltage of a sawtooth wave generator, PWM waves are formed, and a P1 pipe in a BUCK loop is driven by a driving circuit, so that constant-current charging control is realized.
(2) Constant voltage charge control principle.
The voltages at both ends of the battery packs B1 to Bn are collected and amplified to a voltage V3. V3 forms V2 after the regulation of the second PI controller, V2 and V1 are compared and then regulated by the first PI controller to form stable voltage to be compared with the output voltage of the sawtooth wave generator, so that PWM waves are formed, and a P1 pipe in a BUCK loop is driven by a driving circuit, so that constant-voltage charging control is realized.
Referring to fig. 1, the V2 voltage acquisition circuit in this embodiment is designed as a simple and gate circuit consisting of 4 input voltages who are lower than who controls the voltage value of V2. Specifically, the battery voltage conversion processing signal V5, the current reference injection unit V8, the maximum current limiting unit V7, and the charge termination control unit V6 processed by the second PI controller are formed into an and circuit.
And when the battery voltage does not reach the final voltage value corresponding to the voltage reference V4, the V5 generated after the regulation of the second PI controller is in a high level. At the moment, the charging current is controlled by the V8, and the charging current can be changed by changing the size of the V8, so that the function of adjusting the charging current is realized.
When the battery voltage reaches a final voltage value corresponding to the voltage reference V4, V5 generated after adjustment by the second PI controller is in a low level. At this time, the charging current is controlled by V5, and gradually decreases along with the change of V5, so as to realize constant-voltage charging control. The charge final voltage can be changed by changing the V4, and the function of adjusting the charge final voltage is realized.
When the battery is fully charged, in order to avoid the influence of floating charge on the service life of the storage battery, the charge termination control voltage is set to be 0V, and the charge current is set to be 0A at the moment.
V7 is the maximum current limit voltage reference, and when the value of V8 is changed such that V8 > V7, the charging current will not change under V7 control. The design is used for limiting the charging multiplying power of the battery pack and avoiding the influence of too large charging current on the service life of the battery.
(3) Overcharge protection principle of operation.
Under normal conditions, the charging current of the storage battery pack is subjected to constant-current constant-voltage charging under the control of V2. In some special cases, if the charging is not controlled due to damage of individual devices, etc., when the charging current reaches a certain set value or the charging voltage reaches a certain set value, the charging protection control is started, and the relay J1 in the power loop is disconnected, so that the effect of protecting the storage battery pack is achieved.
In summary, compared with the prior art, the method has the following beneficial effects:
1. the utility model provides an adjustable constant-current constant-voltage charging control device, which comprises a charging current sampling resistor, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit, wherein the charging current sampling resistor is connected with the first operational amplifier; the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with a charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel; the output ends of the first operational amplifier and the charging current and voltage regulating module are connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with the main power topology circuit; the main power topology circuit is connected with the storage battery pack. The adjustable constant-current constant-voltage charging control device improves the adjustment flexibility of constant-current constant-voltage charging control, and can better meet the use requirement of the space battery.
2. According to the utility model, the charging current and the charging final voltage can be flexibly changed and set through the charging current and voltage regulating module, the constant-current and constant-voltage charging control device is adjustable, and the operation flexibility of the constant-current and constant-voltage charging control device is ensured.
3. The utility model adopts the BUCK step-down topology circuit to charge the storage battery, and the whole device has small volume, light weight, simple operation implementation and control, and miniaturization and light weight of the product are realized under the condition of not sacrificing the efficiency.
4. The charging protection control module of the utility model enables the adjustable constant-current constant-voltage charging control device to have a charging protection function, and can cut off charging when the final charging voltage is not controlled or the charging current is not controlled, thereby ensuring the safety of the storage battery.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. An adjustable constant current constant voltage charge control device, the device comprising:
the charging circuit comprises a charging current sampling resistor, a first operational amplifier, a charging current voltage regulating module and a constant-current constant-voltage charging control circuit;
the charging current sampling resistor is connected with the storage battery pack in series; the input end of the first operational amplifier is connected with the charging current sampling resistor; the input end of the charging current and voltage regulating module is connected with the storage battery pack in parallel;
the output ends of the first operational amplifier and the charging current and voltage regulating module are both connected with the input end of the constant-current constant-voltage charging control circuit, and the output end of the constant-current constant-voltage charging control circuit is connected with a main power topology circuit; the main power topology circuit is connected with the storage battery pack.
2. The apparatus of claim 1, wherein the apparatus further comprises:
and the input end of the charging protection control module is connected with the storage battery in parallel, and the output end of the charging protection control module is connected with the main power topology circuit.
3. The apparatus of claim 1, wherein the constant-current constant-voltage charge control circuit comprises:
a first PI controller, a sawtooth wave generator, a second operational amplifier and a driving circuit; and the output ends of the first PI controller and the sawtooth wave generator are both connected with the input end of the second operational amplifier, the output end of the second operational amplifier is connected with the driving circuit, and the output end of the driving circuit is connected with the main power topology circuit.
4. A device as claimed in claim 2 or 3, wherein the main power topology circuit comprises:
the bus, and the relay, the PMOS tube, the inductor and the Schottky diode are sequentially connected in series according to the current flow direction in the bus; and the output end of the Schottky diode D2 is connected with a storage battery.
5. The apparatus of claim 4, wherein the primary power topology circuit is a BUCK-type circuit.
6. The apparatus of claim 3, wherein the charging current voltage adjustment module comprises:
the charging control device comprises a voltage conversion circuit, a second PI controller, a voltage reference injection unit, a current reference injection unit, a maximum current limiting unit and a charging termination control unit; the input end of the voltage conversion circuit is connected with the storage battery in parallel, the output end of the voltage conversion circuit is connected with the input end of the second PI controller, the output end of the second PI controller, the current reference injection unit, the maximum current limiting unit and the charging termination control unit form an AND gate circuit, and the output end of the gate circuit is connected with the first PI controller.
7. The apparatus of claim 6, wherein a fast recovery diode is connected in series with the output of the second PI controller, the charge termination control unit, the maximum current limiting unit, and a circuit between the current reference injection unit and the first PI controller.
8. The apparatus of claim 2, wherein the charge protection control module comprises:
the third operational amplifier, the comparison circuit and the driving unit; the input end of the third operational amplifier is connected with the charging current sampling resistor in parallel, the output end of the third operational amplifier is connected with the input end of the comparison circuit, the input end of the comparison circuit is connected with the driving unit, and the driving unit is connected with the relay in the main power topology circuit.
9. The apparatus of claim 8, wherein the relay is a magnetically held relay.
10. The apparatus of claim 1, wherein the battery is a series of several lithium ion batteries.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320263957.XU CN219801914U (en) | 2023-02-21 | 2023-02-21 | Adjustable constant-current constant-voltage charging control device |
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| CN202320263957.XU CN219801914U (en) | 2023-02-21 | 2023-02-21 | Adjustable constant-current constant-voltage charging control device |
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