CN110289654B - Charger and charging circuit and charging control circuit thereof - Google Patents
Charger and charging circuit and charging control circuit thereof Download PDFInfo
- Publication number
- CN110289654B CN110289654B CN201910552530.XA CN201910552530A CN110289654B CN 110289654 B CN110289654 B CN 110289654B CN 201910552530 A CN201910552530 A CN 201910552530A CN 110289654 B CN110289654 B CN 110289654B
- Authority
- CN
- China
- Prior art keywords
- resistor
- charging
- power supply
- switching power
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007600 charging Methods 0.000 title claims abstract description 159
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010277 constant-current charging Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010280 constant potential charging Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 1
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H02J7/0085—
-
- H02J7/0086—
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a charger, a charging circuit and a charging control circuit thereof, wherein a voltage acquisition circuit acquires the current voltage of a battery, and a current acquisition circuit acquires the current charging current of the battery; the charging control module determines the voltage required to be output by the switching power supply according to the current voltage and the current charging current of the battery, and adjusts a feedback signal received by the switching power supply according to the voltage required to be output by the switching power supply so that the switching power supply outputs the voltage required to be output; the switching power supply is used for charging the battery. Therefore, the output of the switching power supply can be adjusted without a battery charging management chip, so that the multi-section charging of the battery is realized, and the cost is reduced.
Description
Technical Field
The invention relates to the field of battery charging, in particular to a charger and a charging circuit and a charging control circuit thereof.
Background
With the development of the times, the energy storage technology is a strategic support for the future energy structure transformation and the power production consumption mode transformation. Under the promotion of the development and commercialization trend of energy storage technology, batteries are gaining wide attention as one of the leading roles.
The battery is used as an energy storage product, and charging is inevitably needed in recycling. If the charging is unreasonable, the chemical performance of the battery is not effectively charged, so that the service life and the utilization rate are greatly reduced, and the early scrapping of the battery is caused. Not only reducing the use value of the product. Meanwhile, the battery belongs to a heavy pollution product, so that the recovery and treatment difficulty is higher, and if the battery is scrapped too fast, the environmental pollution is aggravated.
The existing charging mode usually adopts a switching power supply and a battery charging management chip to carry out charging management, direct current output by the switching power supply is transmitted to the battery charging management chip, and the battery charging management chip adjusts the input direct current and then outputs the adjusted direct current to a battery, so that three-section or four-section charging of the battery is realized, and the service life and the utilization rate of the battery are improved. However, the battery charging management chip is expensive and the cost is too high.
Disclosure of Invention
The invention mainly provides a charger, a charging circuit thereof and a charging control circuit, so as to reduce the cost of the charging circuit.
An embodiment provides a charge control circuit of a battery, including:
the voltage acquisition circuit is used for acquiring the current voltage of the battery;
the current acquisition circuit is used for acquiring the current charging current of the battery;
the charging control module is used for determining the voltage required to be output by the switching power supply according to the current voltage and the current charging current of the battery, and adjusting a feedback signal received by the switching power supply according to the voltage required to be output by the switching power supply to enable the switching power supply to output the voltage required to be output; the switching power supply is used for charging the battery.
In the charging control circuit, the charging control module determines the voltage required to be output by the switching power supply according to the current voltage and the current charging current of the battery, and the adjusting the feedback signal received by the switching power supply according to the voltage required to be output by the switching power supply comprises:
obtaining charging voltage or charging current required by the battery according to the current voltage and the current charging current of the battery, and obtaining voltage required to be output by the switching power supply according to the charging voltage or the charging current required by the battery; and converting the voltage required to be output by the switching power supply into a corresponding PWM signal, and regulating a feedback signal received by the switching power supply through the PWM signal.
In the charging control circuit, the charging control module includes:
the charging control chip is used for determining the voltage required to be output by the switching power supply according to the current voltage and the current charging current of the battery and converting the voltage required to be output by the switching power supply into a corresponding PWM signal;
the level conversion chip is used for adjusting the amplitude of the PWM signal;
the RC filter circuit is used for converting the PWM signal output by the level conversion chip into a direct current level signal;
and the optical coupler is used for coupling the direct current level signal and outputting the direct current level signal to a feedback signal receiving end of the switching power supply.
In the charging control circuit, the charging control module further includes:
the follower is used for following the direct current level signal output by the RC filter circuit;
the operational amplifier is characterized in that a direct current level signal after follow-up processing is input to a positive phase input end of the operational amplifier, a voltage which is output by the switching power supply at present after voltage division is input to an inverse phase input end of the operational amplifier, and an output end of the operational amplifier is connected with the inverse phase input end in a negative feedback mode; the output end of the operational amplifier is connected with the input end of the optical coupler so as to control the working state of the optical coupler.
In the charging control circuit, the level conversion chip is a 74CT244PWR chip, and the charging control chip is an STM32F103C8T6 chip.
An embodiment provides a charging circuit of a battery, which includes a switching power supply and the charging control circuit as described above; and the output end of the charging control circuit is connected with the feedback signal receiving end of the switching power supply.
In the charging circuit, the switching power supply comprises a switching power supply control chip, and the switching power supply control chip is used for performing PWM control on a switching tube of the switching power supply according to the feedback signal so that the voltage output by the switching power supply is stabilized at the voltage corresponding to the feedback signal.
In the charging circuit, the switch power supply is a flyback switch power supply.
In the charging circuit, a switching power supply control chip of the switching power supply is a UC2844 chip, and a COMP end of the UC2844 chip is a feedback signal receiving end of the switching power supply and is connected with an output end of the charging control circuit.
An embodiment provides a charger including the charging circuit as described above.
According to the charger, the charging circuit and the charging control circuit of the charger, the voltage acquisition circuit acquires the current voltage of the battery, and the current acquisition circuit acquires the current charging current of the battery; the charging control module determines the voltage required to be output by the switching power supply according to the current voltage and the current charging current of the battery, and adjusts a feedback signal received by the switching power supply according to the voltage required to be output by the switching power supply so that the switching power supply outputs the voltage required to be output; the switching power supply is used for charging the battery. Therefore, the output of the switching power supply can be adjusted without a battery charging management chip, so that the multi-section charging of the battery is realized, and the cost is reduced.
Drawings
Fig. 1 is a block diagram of a charging circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a level shift chip and its peripheral circuits;
fig. 3 is a circuit diagram of a charge control module except for a charge control chip and a level conversion chip;
FIG. 4 is a circuit diagram of a voltage acquisition circuit;
fig. 5 is a circuit diagram of a current acquisition circuit.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
The charger provided by the invention comprises a shell and a PCB arranged in the shell, wherein a charging circuit is arranged on the PCB. As shown in fig. 1, the charging circuit includes a switching power supply 10 and a charging control circuit, and an output terminal of the charging control circuit is connected to a feedback signal receiving terminal of the switching power supply 10. The charging control circuit includes a current collecting circuit 30, a voltage collecting circuit 40 and a charging control module 20.
The switching power supply 10 may be a dc switching power supply or an ac switching power supply, and the present embodiment is described by taking a flyback switching power supply as an example, and is used to supply power to the battery 50, which includes a main circuit 110 and a control circuit 120. The main loop 110 is a path through which the power current flows in the switching power supply 10, and includes conventional functions of rectification, filtering, energy storage, switching, and the like. The input end of the main loop 110 of the switching power supply circuit inputs alternating current, such as commercial power, and the output end thereof is connected with the battery 50 and performs feedback regulation through the control loop 120. The control loop 120 performs voltage reduction in a PWM control manner, acquires voltage or current output by the main loop 110 to obtain a feedback signal, and maintains the stability of the output voltage through the feedback signal. Specifically, the control circuit 120 includes a switching power supply control chip, and is configured to perform PWM control on a switching tube on the main circuit 10 according to the feedback signal, so that the voltage output by the main circuit 10 is stabilized at the voltage corresponding to the feedback signal. The present invention is an improvement on the circuit, so that the "connections" are all electrical connections.
The current collecting circuit 30 is configured to collect a current charging current of the battery 50, for example, collect a current of the direct current output by the main circuit 110 as the charging current of the battery 50.
The voltage acquisition circuit 40 is used for acquiring the current voltage of the battery 50.
The charging control module 20 is configured to analyze a current charging state of the battery 50 according to a current voltage and a current charging current of the battery 50, determine a charging voltage or a charging current required by the battery 50, and obtain a voltage required to be output by the switching power supply according to the charging voltage or the charging current required by the battery, for example, if the battery 50 needs to be charged with a constant current, the voltage output by the switching power supply needs to be continuously increased, and if the battery 50 needs to be charged with a constant voltage, the voltage output by the switching power supply needs to be maintained unchanged; and then adjusts the feedback signal received by the switching power supply control chip according to the voltage required to be output by the switching power supply, and the switching power supply control chip automatically performs PWM control according to the received feedback signal, so that the main loop 110 outputs the voltage required to be output, thereby enabling the charging voltage or the charging current of the battery 50 to meet the charging requirement.
The invention changes the output of the switch power supply 10 by changing the feedback signal received by the switch power supply control chip, thereby realizing the adjustment of the charging voltage or the charging current of the battery 50, realizing the multi-section charging of the battery without a battery charging management chip and reducing the cost.
Further, the adjusting, by the charging control module 20, the feedback signal received by the switching power supply according to the voltage required to be output by the switching power supply includes: and converting the voltage required to be output by the switching power supply into a corresponding PWM signal, and regulating a feedback signal received by a switching power supply control chip through the PWM signal.
Specifically, as shown in fig. 2 and 3, the charging control module 20 includes an RC filter circuit 210, a follower 220, an operational amplifier Q1, a charging control chip, a level conversion chip U1, and an optocoupler U2.
The charging control chip is used for determining the charging voltage or the charging current required by the battery 50 according to the current voltage and the current charging current of the battery 50, obtaining the voltage required to be output by the switching power supply according to the charging voltage or the charging current required by the battery, and converting the voltage required to be output by the switching power supply into a corresponding PWM signal. In this embodiment, the charging control chip is an STM32F103C8T6 chip.
Since the output voltage of the charge control chip is usually 3.3V, the level shifter chip U1 is used to increase the amplitude of the PWM signal output by the charge control chip to match the subsequent circuit. In this embodiment, the level conversion chip is a 74CT244PWR chip, which is specifically configured to convert the PWM signal with the amplitude of +3.3V output by the charging control chip into a PWM signal of + 5V.
The RC filter circuit 210 is used for converting the PWM signal output by the level conversion chip into a dc level signal.
The follower 220 is used for following the dc level signal output by the RC filter circuit 210, so as to stabilize the dc level signal. As shown in fig. 3, the follower 220 includes an operational amplifier Q2, and an output terminal of the operational amplifier Q2 is connected to an inverting input terminal to constitute the follower 220.
The non-inverting input terminal of the operational amplifier Q1 receives the dc level signal after the follow-up processing, for example, in fig. 3, the non-inverting input terminal of the operational amplifier Q1 is connected to the output terminal of the operational amplifier Q2 through a resistor. The inverted input end of the operational amplifier Q1 inputs the divided current output voltage Vchg of the switching power supply, and closed-loop feedback is achieved. The output terminal of the operational amplifier Q1 is connected to the inverting input terminal in a negative feedback manner. The output end of the operational amplifier Q1 is connected with the input end of the optocoupler U2 to control the working state of the optocoupler U2.
The optical coupler U2 is configured to couple and output the signal output by the operational amplifier Q1 to a feedback signal receiving terminal of the switching power supply 10, that is, to a feedback signal receiving terminal COMP of the switching power supply control chip U3.
As shown in fig. 2, in the present embodiment, the level shift chip U1 further has a peripheral circuit including a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1. The input end of the level conversion chip U1 is connected with the output end of the charging control chip and is connected with the first external power supply terminal VCC through the first resistor R1. The output terminal of the level shift chip U1 is connected to the second external power supply terminal VCC1 through the second resistor R2, and is also connected to one terminal of the third resistor R3. The other end of the third resistor R3 is connected to the input terminal of the RC filter circuit 210 and is grounded through the first capacitor C1. In practice, the third resistor R3 and the first capacitor C1 also form an RC filter circuit.
As shown in fig. 3, the RC filter circuit 210 includes a fourth resistor R4 and a second capacitor C2. One end of the fourth resistor R4 is the input end of the RC filter circuit 210 and is connected to the other end of the third resistor R3. The other end of the fourth resistor R4 is connected to the non-inverting input terminal of the operational amplifier Q2 and to ground through the second capacitor C2.
The charging control module 20 further includes a fifth resistor R5, a sixth resistor R6, 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, a third capacitor C3, and a fourth capacitor C4. The output end of the operational amplifier Q2 is connected to the non-inverting input end of the operational amplifier Q1 through a fifth resistor R5, the inverting input end of the operational amplifier Q1 is connected to one end of a sixth resistor R6 and one end of a seventh resistor R7, the other end of the sixth resistor R6 is connected to the output end of the charging control chip, that is, the other end of the sixth resistor R6 is connected to the voltage Vchg currently output by the switching power supply. The other end of the seventh resistor R7 is connected to ground through an eighth resistor R8. The inverting input terminal of the operational amplifier Q1 is further connected to one terminal of a ninth resistor R9, to the output terminal of the operational amplifier Q1 via a third capacitor C3, and to the output terminal of the operational amplifier Q1 via a tenth resistor R10. The other end of the ninth resistor R9 is connected to the output terminal of the operational amplifier Q1 through a fourth capacitor C4. The output end of the operational amplifier Q1 is also connected with one end of a twelfth resistor R12 and the 2 nd pin of the optocoupler U2 through an eleventh resistor R11. The other end of the twelfth resistor R12 is connected with the 1 st pin of the optocoupler U2 and is connected with the first external power supply end through a thirteenth resistor R13. And a 3 rd pin of the optical coupler U2 is connected with a GND end of the switching power supply control chip U3, and a 4 th pin of the optical coupler U2 is connected with a COMP end of the switching power supply control chip U3. In this embodiment, the switching power supply control chip U3 of the switching power supply 10 is a UC2844 chip, and the COMP end of the UC2844 chip is a feedback signal receiving end of the switching power supply 10 and is connected to the output end of the charging control circuit.
Generally, lithium battery charging has four phases:
stage 1: trickle charge-trickle charge is used to pre-charge (restorative charge) a fully discharged battery cell first. When the battery voltage is lower than about 3V, trickle charging is performed, and the trickle charging current is 0.1c, which is one tenth of the constant charging current (for example, the trickle charging current is 100mA when the constant charging current is 1A).
And (2) stage: constant current charging-when the battery voltage rises above the trickle charge threshold, the charging current is increased for constant current charging. The current of constant current charging is between 0.2C and 1.0C. The voltage of the battery is gradually increased along with the constant current charging process, and the voltage is set to be 3.0-4.2V by a single battery.
And (3) stage: constant voltage charging-when the battery voltage rises to 4.2V, constant current charging ends and the constant voltage charging phase begins. The current is gradually reduced from the maximum value along with the continuous charging process according to the saturation degree of the battery cell, and when the current is reduced to 0.01C, the charging is considered to be terminated. (C is a representation of the nominal capacity of the cell versus current, e.g., 1000mAh for a cell and 1000mA for a charge current at 1℃)
And (4) stage: the charging is terminated.
The present embodiment is described by taking a step-wise charging of a lithium battery as an example. The charging control chip obtains the charging voltage or the charging current required by the battery according to the current charging current of the battery sampled by the current collecting circuit 30 and the current voltage of the battery sampled by the voltage collecting circuit 40 according to a preset rule, for example, if the charging control chip judges that the battery voltage is lower than 3V, the battery needs to be trickle-charged (constant current charging), and obtains the voltage required to be output by the switching power supply according to the charging current required by the trickle-charged, wherein the voltage required to be output is changed in real time, so that the charging current of the battery is constant, and the charging control chip outputs a corresponding PWM signal. The PWM signal is further RC filtered and followed to obtain a level signal at point a (the non-inverting input of the operational amplifier Q1). Meanwhile, the current output voltage Vchg signal of the switching power supply is subjected to a resistor voltage division mode, and a lower level signal is obtained at a point B (the inverting input end of the operational amplifier Q1). The voltage C of the output end is obtained through a negative feedback circuit formed by the operational amplifier Q1, the voltage C and a first external power VCC control the working state of the optocoupler U2, the feedback of the switch power supply control chip U3 COMP end is further controlled, the driving PWM signal of the switch power supply control chip U3 is finally controlled, and the PWM control is performed on the switch tube of the switch power supply 10 through the driving PWM signal, so that the switch power supply 10 outputs the voltage required to be output, and the battery 50 can be charged in a trickle mode. The current collection circuit 30 and the voltage collection circuit 40 continuously collect the current and the voltage, respectively, and when the battery voltage rises above the trickle charge threshold (for example, the battery voltage is higher than 3V), the constant current charging is performed in the same process as the trickle charging except that the charging current is increased. If the voltage of the battery rises to 4.2V, constant voltage charging is carried out, the charging control chip obtains the voltage required to be output by the switching power supply (basically, the required charging voltage of the constant voltage charging) according to the required charging voltage of the constant voltage charging, and a corresponding PWM signal is output. The PWM signal is subjected to RC filtering and following again, and a level signal is obtained at the point A. Meanwhile, a current output voltage Vchg signal of the switching power supply is subjected to a resistor voltage division mode, and a lower level signal is obtained at a point B. The voltage C of the output end is obtained through a negative feedback circuit formed by the operational amplifier Q1, the voltage C and a first external power VCC control the working state of the optocoupler U2, the feedback of the switch power supply control chip U3 COMP end is further controlled, the driving PWM signal of the switch power supply control chip U3 is finally controlled, and the PWM control is performed on the switch tube of the switch power supply 10 through the driving PWM signal, so that the switch power supply 10 outputs the voltage required to be output, and the battery 50 can be charged at constant voltage. Therefore, the invention adopts the mode that the MCU adjusts the feedback signal, realizes multi-section charging, does not need an expensive battery charging management chip, and reduces the cost while realizing the battery charging management.
Referring to fig. 4, the voltage collecting circuit 40 includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16 and a fifth capacitor C5. One end of the fourteenth resistor R14 is connected to the positive electrode of the battery, i.e., one end of the fourteenth resistor R14 receives the battery voltage BAT. The other end of the fourteenth resistor R14 is grounded through the fifteenth resistor R15 and connected to one end of the sixteenth resistor R16. The other end of the sixteenth resistor R16 is the output end of the voltage acquisition circuit 40 and is connected to the charging control chip. That is, the voltage collecting circuit 40 collects the battery voltage BAT and converts it into a detection signal Vbat that can be received by the charging control chip, and outputs the detection signal Vbat to the charging control chip.
Referring to fig. 5, the current collecting circuit 30 includes a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, 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 twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty resistor R30, a thirty-eleventh resistor R31, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10. One end of the seventeenth resistor R17 is grounded, the other end of the seventeenth resistor R17 is connected to one end of the nineteenth resistor R19 through the eighteenth resistor R18, and the other end of the nineteenth resistor R19 is connected to the non-inverting input terminal of the operational amplifier Q4. One end of the twentieth resistor R20 is connected with the output end of the battery or the switching power supply, the other end of the twentieth resistor R20 is connected with one end of the twenty-second resistor R22 through the twenty-first resistor R21, and the other end of the twenty-second resistor R22 is connected with the inverting input end of the operational amplifier Q4. The non-inverting input terminal of the operational amplifier Q4 is also grounded through a twenty-third resistor R23, a twenty-fourth resistor R24 and a sixth capacitor C6, respectively. The inverting input terminal of the operational amplifier Q4 is further connected to the output terminal of the operational amplifier Q4 and one end of a twenty-fifth resistor R25 through a seventh capacitor C7. The other end of the twenty-fifth resistor R25 is connected with one end of the twenty-eighth resistor R28, and is connected with the inverting input end of the operational amplifier Q4 through a twenty-sixth resistor R26, a twenty-seventh resistor R27 and an eighth capacitor C8. The other end of the twenty-eighth resistor R28 is connected to the non-inverting input terminal of the operational amplifier Q5 and to ground through the ninth capacitor C9. The output end of the operational amplifier Q5 is connected with one end of a thirty-third resistor R30 and one end of a thirty-first resistor R31 through a twenty-ninth resistor R29. The other end of the thirty-third resistor R30 is connected with the inverting input end of the operational amplifier Q5. The other end of the thirty-first resistor R31 is the output end of the current collecting circuit 30, connected to the charging control chip, and grounded through the tenth capacitor C10. That is, the current collecting circuit 30 obtains a voltage signal by passing the charging current through the detecting resistor, amplifies the voltage signal to a voltage signal easily recognized by the charging control chip through the differential amplifying circuit, and ensures that the voltage signal is more stable and reliable through the first-stage following (Q5).
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (7)
1. A charge control circuit for a battery, comprising:
the voltage acquisition circuit is used for acquiring the current voltage of the battery and comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a fifth capacitor, wherein the voltage of the battery is input into one end of the fourteenth resistor, the other end of the fourteenth resistor is grounded through the fifteenth resistor and is connected with one end of the sixteenth resistor, and the other end of the sixteenth resistor is the output end of the voltage acquisition circuit and is connected with the charging control chip;
the current acquisition circuit is used for acquiring the current charging current of the battery and comprises a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, 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 twenty-eighth resistor, a twenty-ninth resistor, a thirty-eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an operational amplifier Q4 and an operational amplifier Q5, wherein one end of the seventeenth resistor is grounded, the other end of the seventeenth resistor is connected with one end of the nineteenth resistor through the eighteenth resistor, the other end of the nineteenth resistor is connected with the positive-phase input end of the operational amplifier Q4, one end of the twentieth resistor is connected with the output end of the battery or a switching power supply, the other end of the twentieth resistor is connected with one end of the, the other end of the twenty-second resistor is connected with the inverting input end of the operational amplifier Q4, the non-inverting input end of the operational amplifier Q4 is grounded through a thirteenth resistor, a twenty-fourth resistor and a sixth capacitor, and the inverting input end of the operational amplifier Q4 is connected with the output end of the operational amplifier Q4 and one end of a twenty-fifth resistor through a seventh capacitor; the other end of the twenty-fifth resistor is connected with one end of the twenty-eighth resistor, and is respectively connected with the inverting input end of the operational amplifier Q4 through a twenty-sixth resistor, a twenty-seventh resistor and an eighth capacitor; the other end of the twenty-eighth resistor is connected with the positive phase input end of the operational amplifier Q5 and is grounded through a ninth capacitor; the output end of the operational amplifier Q5 is connected with one end of a thirtieth resistor and one end of a thirty-first resistor through a twenty-ninth resistor; the other end of the thirtieth resistor is connected with the inverting input end of the operational amplifier Q5; the other end of the thirty-first resistor is the output end of the current acquisition circuit, is connected with the charging control chip and is grounded through a tenth capacitor;
the charging control module is used for obtaining charging voltage or charging current required by the battery according to the current voltage and the current charging current of the battery and obtaining voltage required to be output by the switching power supply according to the charging voltage or the charging current required by the battery; converting the voltage required to be output by the switching power supply into a corresponding PWM signal, and regulating a feedback signal received by the switching power supply through the PWM signal to enable the switching power supply to output the voltage required to be output; the switching power supply is used for charging a battery;
the charging control module includes:
the charging control chip is used for determining the charging voltage or the charging current required by the battery according to the current voltage and the current charging current of the battery, obtaining the voltage required to be output by the switching power supply according to the charging voltage or the charging current required by the battery, and converting the voltage required to be output by the switching power supply into a corresponding PWM signal;
the level conversion chip is used for adjusting the amplitude of the PWM signal; the level conversion chip is also provided with a peripheral circuit which comprises a first resistor, a second resistor, a third resistor and a first capacitor; the input end of the level conversion chip is connected with the output end of the charging control chip and is connected with a first external power supply end through a first resistor; the output end of the level conversion chip is connected with a second external power supply end through a second resistor and is also connected with one end of a third resistor; the other end of the third resistor is connected with the input end of the RC filter circuit and is grounded through the first capacitor;
the RC filter circuit is used for converting the PWM signal output by the level conversion chip into a direct current level signal;
the optical coupler is used for coupling the direct current level signal and outputting the direct current level signal to a feedback signal receiving end of the switching power supply;
the follower is used for following the direct current level signal output by the RC filter circuit;
the operational amplifier is characterized in that a direct current level signal after follow-up processing is input to a positive phase input end of the operational amplifier, a voltage which is output by the switching power supply at present after voltage division is input to an inverse phase input end of the operational amplifier, and an output end of the operational amplifier is connected with the inverse phase input end in a negative feedback mode; the output end of the operational amplifier is connected with the input end of the optical coupler so as to control the working state of the optical coupler.
2. The charge control circuit of claim 1, wherein the level conversion chip is a 74CT244PWR chip and the charge control chip is an STM32F103C8T6 chip.
3. A charging circuit for a battery, comprising a switching power supply and a charge control circuit according to claim 1 or 2; and the output end of the charging control circuit is connected with the feedback signal receiving end of the switching power supply.
4. The charging circuit according to claim 3, wherein the switching power supply includes a switching power supply control chip, and the switching power supply control chip is configured to perform PWM control on a switching tube of the switching power supply according to the feedback signal, so that a voltage output by the switching power supply is stabilized at a voltage corresponding to the feedback signal.
5. The charging circuit of claim 3, wherein the switching power supply is a flyback switching power supply.
6. The charging circuit as claimed in claim 3, wherein the switching power supply control chip of the switching power supply is a UC2844 chip, and the COMP terminal of the UC2844 chip is a feedback signal receiving terminal of the switching power supply and is connected to the output terminal of the charging control circuit.
7. A charger, characterized in that it comprises a charging circuit according to any one of claims 3 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910552530.XA CN110289654B (en) | 2019-06-25 | 2019-06-25 | Charger and charging circuit and charging control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910552530.XA CN110289654B (en) | 2019-06-25 | 2019-06-25 | Charger and charging circuit and charging control circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110289654A CN110289654A (en) | 2019-09-27 |
| CN110289654B true CN110289654B (en) | 2021-06-04 |
Family
ID=68005633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910552530.XA Active CN110289654B (en) | 2019-06-25 | 2019-06-25 | Charger and charging circuit and charging control circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110289654B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753158A (en) * | 2013-12-31 | 2015-07-01 | 广州市君盘实业有限公司 | SG3525 integrated chip-based single-chip microprocessor control technology charger |
| CN108988412A (en) * | 2018-06-20 | 2018-12-11 | 国网江苏省电力有限公司泰州供电分公司 | A kind of accumulator charging and discharging control method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431250A (en) * | 2007-11-06 | 2009-05-13 | 上海辰蕊微电子科技有限公司 | Charging management control circuit used for battery charger and its control method |
| CN204835631U (en) * | 2015-08-12 | 2015-12-02 | 苏州汇川技术有限公司 | Digifax hybrid control storage battery charging circuit |
| CN107577181A (en) * | 2017-08-30 | 2018-01-12 | 苏州麦喆思科电子有限公司 | A kind of civil power household electricity control system using conjunction inside back cover pole pipe |
| CN207939403U (en) * | 2018-01-26 | 2018-10-02 | 广州视琨电子科技有限公司 | A kind of supply unit and intelligent lock device |
-
2019
- 2019-06-25 CN CN201910552530.XA patent/CN110289654B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753158A (en) * | 2013-12-31 | 2015-07-01 | 广州市君盘实业有限公司 | SG3525 integrated chip-based single-chip microprocessor control technology charger |
| CN108988412A (en) * | 2018-06-20 | 2018-12-11 | 国网江苏省电力有限公司泰州供电分公司 | A kind of accumulator charging and discharging control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110289654A (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204028737U (en) | A kind of battery analogue circuit | |
| CN101986508B (en) | Battery equalizing device | |
| CN211557147U (en) | Programmable adjustable boosting power circuit | |
| CN203205946U (en) | Charging management circuit and system | |
| CN103199593B (en) | Charging management circuit and system | |
| CN104767252A (en) | Tablet computer | |
| CN205123394U (en) | Optional power adapter of output voltage | |
| CN108809071A (en) | A kind of SS (soft start) control circuit and Switching Power Supply of Switching Power Supply | |
| CN204615444U (en) | Panel computer | |
| CN103532394A (en) | Continuously adjustable intelligent power module | |
| CN110289654B (en) | Charger and charging circuit and charging control circuit thereof | |
| CN101860054B (en) | Charge management circuit of lithium-ion battery | |
| CN206559099U (en) | A kind of charge management circuit | |
| CN204290758U (en) | Adaptive voltage output power supply circuit and supply unit | |
| CN203553909U (en) | Self-powered storage-battery overcharge protection circuit | |
| CN204967352U (en) | Mobile power source | |
| CN103647447A (en) | Power supply device of communication module of electric energy meter | |
| WO2022217857A1 (en) | Charging control method and system | |
| CN205092640U (en) | Miniature balance control battery charging unit | |
| CN212784852U (en) | Battery management system for base station standby power supply | |
| CN105914832A (en) | Adjustable voltage feedback circuit with constant current protection and working method | |
| CN103280850A (en) | Drive circuit with charger baby and multipurpose LED (light-emitting diode) functions | |
| CN206908515U (en) | A kind of synchronization lifting volt circuit of wide-voltage range input | |
| CN206111606U (en) | Minitype fan | |
| CN219801962U (en) | Multi-lithium battery charger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |