CN112510770A - Storage battery charging system - Google Patents
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- CN112510770A CN112510770A CN202011191974.4A CN202011191974A CN112510770A CN 112510770 A CN112510770 A CN 112510770A CN 202011191974 A CN202011191974 A CN 202011191974A CN 112510770 A CN112510770 A CN 112510770A
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
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Abstract
The invention relates to a storage battery charging system, which comprises an auxiliary power supply, an analog control unit, a digital DSP (digital signal processor) processing unit, a voltage sampling module, a current sampling module, a voltage compensation network, a current compensation network, a frequency setting module, an isolation driving circuit, an intermittent control circuit, a battery information sampling module and a FLASH module, wherein the auxiliary power supply is connected with the analog control unit; the auxiliary power supply supplies power to the analog control unit, the digital DSP processing unit, the isolation driving circuit, the FLASH module and the battery information sampling module; the voltage sampling module feeds back the output voltage value of the APFC circuit to the analog control unit in a resistance voltage division mode, reduces the error between the feedback value and the internal reference value of the analog control unit through a voltage compensation network, forms a voltage closed-loop network, and stabilizes the output voltage of the APFC circuit. According to the invention, by means of a control mode of high-frequency switching frequency, the volume of the magnetic component is effectively reduced, the volume of the whole machine is further reduced, the power density of a power supply is improved, and the miniaturization of the charger is realized.
Description
Technical Field
The invention belongs to the technical field of power supplies, and relates to a storage battery charging system.
Background
The accumulator charger outputs the charge quantity needed by the battery through the power converter. The topology structure is composed of an active power factor corrector (front stage APFC) and a full-bridge converter (rear stage LLC), and normally, the front stage and the rear stage are both controlled digitally. The disadvantages of digital control are: the control algorithm has the advantages of long development time, low reliability, complex sampling circuit, requirement of power supply of a plurality of paths of high-precision auxiliary power supplies, mutual interference between an analog ground and a digital ground, large volume and high cost. The digital control has the advantages that: the control process is programmable, the precision is high, and the flexibility is strong. Since the latter stage needs to implement a programmable charge control algorithm, analog control is not easy to implement, and thus digital control is adopted. However, since the APFC functions to realize a high power factor and provide a dc voltage with a small ripple to the subsequent stage, no special function development is required, and the analog control integration algorithm is mature and reliable, if the previous stage also employs digital control, the disadvantages of the digital control are further overlapped, and the advantages of the analog control are not fully utilized, thereby increasing the burden of the designer undoubtedly and reducing the development efficiency.
The charge control algorithm realizes the charge control of the battery, and the traditional four-stage control algorithm comprises the following steps: pre-charging, segmented constant current charging, constant voltage charging and floating charging.
The segmented constant-current charging control method realizes that the actual charging curve is close to the Gaussian curve in a mode that the maximum charging current acceptable by the battery is in gradient decline. The constant current charging termination criterion at each stage is as follows: integration of charging time, battery temperature and termination voltage. Usually, there is a significant variation between the gradient values and there is a long constant current charging period. Therefore, it causes problems that: the maximization of the charging current cannot be realized in each stage, the charging time is long, and the charging efficiency is low.
The constant current stage charging is ended and a constant voltage charging stage is carried out, and in the constant voltage charging stage, due to the existence of resistance polarization, concentration polarization and electrochemical polarization, polarization voltage generated by the battery is particularly obvious, so that the charging speed and the chargeable capacity are influenced.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the storage battery charging system is provided, so that the advantages of analog control and digital control are fully exerted by combining the analog control with the digital control, and the superposition of the defects of the digital control is further reduced; the segmented constant-current control stage is changed into a segmented variable-current control stage, so that an actual charging current curve is attached to a Gaussian curve to the maximum extent, and the problems of long charging time and low charging efficiency are solved; the constant voltage charging stage is changed into an intermittent charging stage, so that the influence of the polarization voltage on the battery charging is solved.
The technical scheme of the invention is as follows:
a battery charging system, comprising: the device comprises an auxiliary power supply, an analog control unit, a digital DSP processing unit, a voltage sampling module, a current sampling module, a voltage compensation network, a current compensation network, a frequency setting module, an isolation driving circuit, an intermittent control circuit, a battery information sampling module and a FLASH module;
the auxiliary power supply supplies power to the analog control unit, the digital DSP processing unit, the isolation driving circuit, the FLASH module and the battery information sampling module;
the voltage sampling module feeds back the output voltage value of the APFC circuit to the analog control unit in a resistance voltage division mode, reduces the error between the feedback value and the internal reference value of the analog control unit through a voltage compensation network, forms a voltage closed-loop network and stabilizes the output voltage of the APFC circuit;
the current sampling module feeds back the inductance current value of the APFC circuit to the analog control unit through a resistor, reduces the error between the feedback value and the reference value inside the analog control unit through a current compensation network, forms a current closed-loop network and realizes power factor correction;
the frequency setting module sets switching frequency for the analog control unit, and the analog control unit adjusts the switch tube conduction time of the APFC circuit through an external voltage compensation network, a current compensation network and an internal integrated average current control method;
the battery information sampling module feeds back battery voltage, battery current and battery temperature to the digital DSP processing unit, and the digital DSP processing unit adjusts the internal PWM module to the isolation driving circuit and controls the conduction time of a switch tube of the full-bridge LLC circuit so as to realize the charging function of the charger;
the communication module of the digital DSP processing unit is connected with the FLASH module to read and write the SOC charge state information of the battery;
the digital DSP processing unit realizes the intermittent charging of the battery pack through an intermittent control circuit.
Furthermore, the voltage sampling module provides a bus voltage feedback value for the analog control unit, reduces the error between the feedback value and an internal reference value of the analog control unit through a voltage compensation network, forms a voltage closed-loop network, and stabilizes the output voltage of the APFC circuit.
Furthermore, the current sampling module provides a feedback value of the inductive current for the analog control unit, reduces an error between the feedback value and a reference value generated by an internal algorithm of the analog control unit through a current compensation network, forms a current closed-loop network, and realizes a power factor correction function.
Further, the frequency setting module provides the switching frequency of the PWM for the analog control unit.
Furthermore, the digital DSP processing unit realizes the intermittent charging of the battery pack through an intermittent control circuit.
Furthermore, the battery information sampling module provides battery voltage, battery current and battery temperature feedback values for the digital DSP processing unit, analog quantity is converted into digital quantity through A/D conversion in the digital DSP processing unit, the duty ratio of the PWM module is adjusted in a closed loop mode through a segmented variable current charging control algorithm, and the conduction time of a full-bridge LLC circuit switching tube is controlled by the isolation driving circuit, so that the segmented variable current charging-intermittent charging control function of the charger is realized.
Further, the working process of the analog control APFC circuit is as follows:
the voltage sampling module obtains a 5V feedback voltage to a Vsense pin of the analog control unit in a mode of serially connecting a resistor with a sub-bus voltage, the Vsense pin is compared with a 5V reference source in the analog control unit, a generated difference value is used as the input of a voltage error amplifier in the analog control unit, and the voltage of a VCOMP terminal of the analog control unit is adjusted through a voltage compensation network to reduce the input error so as to achieve the purpose of stabilizing the output voltage;
the reference current generated by the internal integration algorithm of the analog control unit is compared with the inductance current value fed back to an Isense pin of the analog control unit by a current sampling module, the generated difference value is used as the input of an internal current error amplifier of the analog control unit, the ICOMP terminal voltage of the analog control unit is adjusted by a current compensation network to reduce the input error, and the ICOMP terminal voltage is compared with triangular waves generated by the internal integration algorithm of the analog control unit to realize PWM control and further realize power factor correction.
Further, the working process of the digital control full-bridge LLC circuit is as follows:
s1: the battery open-circuit voltage is collected through the battery information sampling module, whether the battery is fully charged is judged, and the method comprises the following steps: no charging is required, no: judging whether pre-charging is needed; precharge required, proceeding to S2, precharge unnecessary, proceeding to S3;
s2: setting a pre-charging constant-current charging value, detecting whether the terminal voltage of the battery reaches a threshold value of a large-current charging voltage, if not, continuing charging, and if so, entering S3;
s3: monitoring and calculating the SOC of the current battery, calculating the maximum allowable current I0, and judging the SOC threshold interval in which the current battery SOC is located, wherein the threshold point SOC1 corresponds to the charging current IC1, and the threshold point SOC2 corresponds to the charging current IC 2;
s4: the initial maximum received current is decreased progressively at a speed [ (IC1-IC2)/T, wherein T is threshold interval time variation ], and the delta SOC of the battery charged in real time in the threshold interval is calculated through an enhanced coulomb counting algorithm;
s5: judging whether the delta SOC plus the SOC1 is equal to the SOC2, if not, continuing to decrease the charging current according to the current rate of the step S4, if so, entering S3;
s6: when the SOC of the battery reaches 80%, stopping charging for 5 min;
s7: setting an intermittent charging current value and an intermittent charging period value, adjusting the charging time of the battery pack by the digital DSP processing unit through an intermittent control circuit, stopping charging when the voltage of the detected battery terminal reaches a threshold voltage, and repeating the charging when the time reaches the intermittent period;
s8: and calculating the negative increase rate of the voltage by detecting the voltage drop value of the battery terminal in the charging stop time, and stopping charging when the negative increase rate of the voltage is less than a threshold value of 5 mv/s.
Furthermore, the set current values are reference currents of a DSP controller charging control algorithm, the battery information sampling module collects the charging currents of the battery, the charging currents are compared with the reference currents, the generated difference values are subjected to PI control algorithm to adjust the duty ratio of the PWM module, the switch tube conduction time of the full-bridge LLC circuit is controlled through the isolation driving circuit, and the stability of a current loop is further achieved.
Further, the calculated value of the battery SOC is stored in the FLASH module; and when the temperature of the battery collected by the battery information sampling module reaches a preset upper limit threshold value, reducing the charging current, and stopping charging if the temperature continues to rise.
Further, the segmented variable current control algorithm is as follows:
dividing a maximum current charging curve acceptable by a battery into N SOC threshold value intervals, (SOC1-SOC2) is one SOC threshold value interval, IC1 is the maximum acceptable current corresponding to SOC1, IC2 is the maximum acceptable current corresponding to SOC2, a charger charges the battery by IC1, the battery is decreased at a current rate of (IC1-IC2)/T, wherein T is the time required by IC1 to be decreased to IC2, the delta SOC of the battery in the threshold value interval in real time is calculated through an enhanced coulomb counting algorithm, and whether the delta SOC plus the SOC1 is equal to the SOC2 is judged to determine whether to enter the next stage; the PWM module duty cycle of the digital DSP processing unit is adjusted by comparison of the calculated current value IC3 with the sampled battery current value.
Further, the enhanced coulomb counting algorithm is as follows: [ ((IC1-IC3)/2+ IC3) × T ] (IC1- [ (IC1-IC2)/T ] × T), wherein IC3 is a reference value of the output current of the charger, and T is the actual occurrence time of the reduced current.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention combines APFC circuit analog control and LLC circuit digital control to supplement the required charge quantity of the battery pack, compared with the prior art which adopts a full digital control mode, on the basis of realizing the algorithm of the later-stage LLC circuit charging control, the invention realizes the high-power factor and high-efficiency APFC function through the mature algorithm in the analog control unit, can effectively reduce the algorithm development time, increase the reliability, greatly reduce the cost, the volume and the circuit complexity problems brought by an operational amplifier circuit or a sensor circuit through resistance mode sampling, only one auxiliary power supply is needed to supply power for the analog control unit by adopting analog control, the problem of mutual interference between an analog ground and a digital ground can not be generated, and the difficulty of circuit layout and wiring can be reduced;
(2) the invention adopts a segmented variable current charging control algorithm, an SOC threshold point interval is segmented, a connecting line between threshold points is tangent to a Gaussian curve, and an output current curve of a charger is a curve formed by connecting lines of each segment of threshold interval;
(3) according to the invention, after the battery charge SOC is 80%, an intermittent control algorithm is adopted, and the digital DSP processing unit is used for controlling the on-off of an intermittent circuit, so that the existence of resistance polarization, concentration polarization and electrochemical polarization can be effectively reduced, the polarization voltage is further reduced, the charging speed is improved, and the full capacity of the battery is ensured;
(4) the invention adopts the negative voltage increase rate as the judgment basis of the full charge of the charger, detects the reduction rate of the voltage of the battery in unit time in the intermittent charging stage, is not influenced by the environmental temperature, is only related to the chemical reaction degree in the battery, effectively reflects the chargeable capacity of the battery and prolongs the service life of the battery;
(5) according to the invention, by means of a control mode of high-frequency switching frequency, the volume of the magnetic component is effectively reduced, the volume of the whole machine is further reduced, the power density of a power supply is improved, and the miniaturization of the charger is realized.
Drawings
FIG. 1 is a schematic diagram of the power conversion and control of the battery charger of the present invention;
FIG. 2 is a flow chart of a full-bridge LLC circuit charging control algorithm of the invention;
FIG. 3 is a partition diagram of the SOC phase of the Gaussian curve of the present invention;
FIG. 4 is a graph of the Mass curve Δ SOC algorithm of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the battery charger comprises an EMI filter circuit, a rectifier circuit, an APFC circuit, a full-bridge LLC circuit, an isolation transformer, a rectifier filter circuit, an auxiliary power supply, an analog control unit, a digital DSP processing unit, a voltage sampling module, a current sampling module, a voltage compensation network, a current compensation network, a frequency setting module, an isolation drive circuit, an intermittent control circuit, a battery information sampling module, and a FLASH module.
After the electromagnetic interference of 220VAC is suppressed by the EMI filter circuit, the steamed bread wave with the voltage peak value of about 310VDC is output by the rectifying circuit, the APFC circuit realizes that the input current changes along with the input voltage in a sine mode and outputs stable direct current, the direct current-to-alternating current conversion is completed through the full-bridge LLC circuit, and the controllable direct current is output through the isolation transformer and the rectifying filter circuit to charge the storage battery.
The auxiliary power supply supplies power to the analog control unit, the digital DSP processing unit, the isolation driving circuit, the FLASH module and the battery information sampling module;
the voltage sampling module collects bus voltage output by the APFC circuit to the analog control unit and the voltage compensation network, the error between a feedback value and a reference value inside the analog control unit is reduced through the voltage compensation network to form a voltage closed-loop network, and the analog control unit adjusts the PWM duty ratio of the GATE end to the APFC circuit to stabilize the output voltage of the APFC circuit;
the current sampling module collects an inductive current output by the APFC circuit to the analog control unit and the current compensation network, reduces an error between a feedback value and a reference value generated by an internal algorithm of the analog control unit through the current compensation network to form a current closed-loop network, and the analog control unit adjusts the PWM duty ratio of the GATE end to the APFC circuit to realize a power factor correction function;
the frequency setting module provides PWM switching frequency for the analog control unit;
the battery information sampling module collects battery voltage, battery current and battery temperature to the digital DSP processing unit, analog quantity is converted into digital quantity through the A/D conversion module, the duty ratio of the PWM module is adjusted in a closed loop mode through a charging control algorithm, and the conduction time of a switch tube of a full-bridge LLC circuit is controlled by an isolation driving circuit, so that the control function of charging machine sectional variable current charging-intermittent charging is realized;
reading the SOC information of the battery through the FLASH module and the digital DSP processing unit in real time communication;
the digital DSP processing unit controls the intermittent control circuit through the I/O module to realize the intermittent charging control of the battery pack.
The working process of the analog control APFC circuit is as follows:
the voltage sampling module obtains 5V feedback voltage to a Vsense pin of the analog control unit in a mode that a resistor is connected in series with the voltage of a branch bus, the 5V feedback voltage is compared with a 5V reference source in the analog control unit, a generated difference value (error) is used as the input of a voltage error amplifier in the analog control unit, and the voltage of a Vcomp end of the analog control unit is adjusted through a voltage compensation network to reduce the input error so as to achieve the purpose of stabilizing output voltage; the reference current generated by the internal algorithm of the analog control unit is compared with the inductance current value fed back to an Isense pin of the analog control unit by a current sampling module, the generated difference (error) is used as the input of a current error amplifier in the analog control unit, the Icomp terminal voltage of the analog control unit is adjusted by a current compensation network to reduce the input error, and the PWM control is realized by comparing the Icomp terminal voltage with the triangular wave generated by the internal integrated algorithm of the analog control unit, so that the power factor correction is realized.
The digital control full bridge LLC circuit works as follows, as shown in FIG. 2:
s1: the battery open-circuit voltage is collected through the battery information sampling module, whether the battery is fully charged is judged, and the method comprises the following steps: no charging is required, no: judging whether pre-charging is needed; precharge required, proceeding to S2, precharge unnecessary, proceeding to S3;
s2: setting a pre-charging constant-current charging value, detecting whether the terminal voltage of the battery reaches a threshold value of a large-current charging voltage, if not, continuing charging, and if so, entering S3;
s3: monitoring and calculating the current battery SOC, calculating the maximum allowable current I0, and judging the SOC threshold interval in which the current battery SOC is located, as shown in FIG. 3, taking threshold interval SOC12 (threshold point SOC1 corresponding to charging current IC1, threshold point SOC2 corresponding to charging current IC2) as an example, the following steps are consistent;
s4: the initial maximum received current is decreased progressively at a rate [ (IC1-IC2)/T, T being a time variation of a threshold interval ], and as shown in fig. 4, Δ SOC of the battery in real time charging in the threshold interval is calculated by an enhanced coulomb counting algorithm [ ((IC1-IC3)/2+ IC3) × T ] (IC3 being a reference value of the output current of the charger (IC1- [ (IC1-IC2)/T ] ×) and T being an actual occurrence time of the reduced current);
s5: judging whether the delta SOC plus the SOC1 is equal to the SOC2, if not, continuing to decrease the charging current according to the current rate of the step S4, if so, entering S3;
s6: when the SOC of the battery reaches 80%, stopping charging for 5 min;
s7: setting an intermittent charging current value and an intermittent charging period value, adjusting the charging time of the battery pack by the digital DSP processing unit through an intermittent control circuit, stopping charging when the voltage of the detected battery terminal reaches a threshold voltage, and repeating the charging when the time reaches the intermittent period;
s8: calculating the negative increase rate of voltage by detecting the voltage drop value of the battery terminal in the charging stop time, and stopping charging when the negative increase rate of voltage is less than a threshold value of 5 mv/s;
the set current values are reference currents of a DSP controller charge control algorithm, a battery information sampling module collects the charge currents of the battery, the charge currents are compared with the reference currents, the generated difference (error) is subjected to a PI control algorithm to adjust the duty ratio of a PWM (pulse width modulation) module, and the conduction time of a switch tube of a full-bridge LLC (logical link control) circuit is controlled through an isolation driving circuit, so that the stability of a current loop is further realized; the calculated value of the SOC of the battery is stored in the FLASH module; and when the temperature of the battery collected by the battery information sampling module reaches a preset upper limit threshold value, reducing the charging current, and stopping charging if the temperature continues to rise.
The invention combines APFC circuit analog control and LLC circuit digital control to supplement the required charge quantity of the battery pack, compared with the prior art which adopts a full digital control mode, on the basis of realizing the algorithm of the later-stage LLC circuit charging control, the invention realizes the high-power factor and high-efficiency APFC function through the mature algorithm in the analog control unit, can effectively reduce the algorithm development time, increase the reliability, greatly reduce the cost, the volume and the circuit complexity problems brought by an operational amplifier circuit or a sensor circuit through resistance mode sampling, only one auxiliary power supply is needed to supply power for the analog control unit by adopting analog control, the problem of mutual interference between an analog ground and a digital ground can not be generated, and the difficulty of circuit layout and wiring can be reduced;
the invention adopts a segmented variable current charging control algorithm, an SOC threshold point interval is segmented, a connecting line between threshold points is tangent to a Gaussian curve, and an output current curve of a charger is a curve formed by connecting lines of each segment of threshold interval;
according to the invention, after the battery charge SOC is 80%, an intermittent control algorithm is adopted, and the digital DSP processing unit is used for controlling the on-off of an intermittent circuit, so that the existence of resistance polarization, concentration polarization and electrochemical polarization can be effectively reduced, the polarization voltage is further reduced, the charging speed is improved, and the full capacity of the battery is ensured;
the invention adopts the negative voltage increase rate as the judgment basis of the full charge of the charger, detects the reduction rate of the voltage of the battery in unit time in the intermittent charging stage, is not influenced by the environmental temperature, is only related to the chemical reaction degree in the battery, effectively reflects the chargeable capacity of the battery and prolongs the service life of the battery;
according to the invention, by means of a control mode of high-frequency switching frequency, the volume of the magnetic component is effectively reduced, the volume of the whole machine is further reduced, the power density of a power supply is improved, and the miniaturization of the charger is realized.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (12)
1. A battery charging system, comprising: the device comprises an auxiliary power supply, an analog control unit, a digital DSP processing unit, a voltage sampling module, a current sampling module, a voltage compensation network, a current compensation network, a frequency setting module, an isolation driving circuit, an intermittent control circuit, a battery information sampling module and a FLASH module;
the auxiliary power supply supplies power to the analog control unit, the digital DSP processing unit, the isolation driving circuit, the FLASH module and the battery information sampling module;
the voltage sampling module feeds back the output voltage value of the APFC circuit to the analog control unit in a resistance voltage division mode, reduces the error between the feedback value and the internal reference value of the analog control unit through a voltage compensation network, forms a voltage closed-loop network and stabilizes the output voltage of the APFC circuit;
the current sampling module feeds back the inductance current value of the APFC circuit to the analog control unit through a resistor, reduces the error between the feedback value and the reference value inside the analog control unit through a current compensation network, forms a current closed-loop network and realizes power factor correction;
the frequency setting module sets switching frequency for the analog control unit, and the analog control unit adjusts the switch tube conduction time of the APFC circuit through an external voltage compensation network, a current compensation network and an internal integrated average current control method;
the battery information sampling module feeds back battery voltage, battery current and battery temperature to the digital DSP processing unit, and the digital DSP processing unit adjusts the internal PWM module to the isolation driving circuit and controls the conduction time of a switch tube of the full-bridge LLC circuit so as to realize the charging function of the charger;
the communication module of the digital DSP processing unit is connected with the FLASH module to read and write the SOC charge state information of the battery;
the digital DSP processing unit realizes the intermittent charging of the battery pack through an intermittent control circuit.
2. A battery charging system as claimed in claim 1, wherein: the voltage sampling module provides a bus voltage feedback value for the analog control unit, reduces errors between the feedback value and an internal reference value of the analog control unit through a voltage compensation network, forms a voltage closed-loop network, and stabilizes output voltage of the APFC circuit.
3. A battery charging system as claimed in claim 2, wherein: the current sampling module provides a feedback value of the inductive current for the analog control unit, reduces an error between the feedback value and a reference value generated by an internal algorithm of the analog control unit through a current compensation network, forms a current closed-loop network, and realizes a power factor correction function.
4. A battery charging system as claimed in claim 2, wherein: the frequency setting module provides PWM switching frequency for the analog control unit.
5. A battery charging system as claimed in claim 2, wherein: the digital DSP processing unit realizes the intermittent charging of the battery pack through an intermittent control circuit.
6. A battery charging system according to claim 5, wherein: the battery information sampling module provides battery voltage, battery current and battery temperature feedback values for the digital DSP processing unit, analog quantity is converted into digital quantity through A/D conversion in the digital DSP processing unit, the duty ratio of the PWM module is adjusted in a closed loop mode through a segmented variable current charging control algorithm, and the conduction time of a switch tube of a full-bridge LLC circuit is controlled by the isolation driving circuit, so that the segmented variable current charging-intermittent charging control function of the charger is realized.
7. A battery charging system as claimed in claim 2, wherein: the working process of the analog control APFC circuit is as follows:
the voltage sampling module obtains a 5V feedback voltage to a Vsense pin of the analog control unit in a mode of serially connecting a resistor with a sub-bus voltage, the Vsense pin is compared with a 5V reference source in the analog control unit, a generated difference value is used as the input of a voltage error amplifier in the analog control unit, and the voltage of a VCOMP terminal of the analog control unit is adjusted through a voltage compensation network to reduce the input error so as to achieve the purpose of stabilizing the output voltage;
the reference current generated by the internal integration algorithm of the analog control unit is compared with the inductance current value fed back to an Isense pin of the analog control unit by a current sampling module, the generated difference value is used as the input of an internal current error amplifier of the analog control unit, the ICOMP terminal voltage of the analog control unit is adjusted by a current compensation network to reduce the input error, and the ICOMP terminal voltage is compared with triangular waves generated by the internal integration algorithm of the analog control unit to realize PWM control and further realize power factor correction.
8. A battery charging system as claimed in claim 2, wherein: the working process of the digital control full-bridge LLC circuit is as follows:
s1: the battery open-circuit voltage is collected through the battery information sampling module, whether the battery is fully charged is judged, and the method comprises the following steps: no charging is required, no: judging whether pre-charging is needed; precharge required, proceeding to S2, precharge unnecessary, proceeding to S3;
s2: setting a pre-charging constant-current charging value, detecting whether the terminal voltage of the battery reaches a threshold value of a large-current charging voltage, if not, continuing charging, and if so, entering S3;
s3: monitoring and calculating the SOC of the current battery, calculating the maximum allowable current I0, and judging the SOC threshold interval in which the current battery SOC is located, wherein the threshold point SOC1 corresponds to the charging current IC1, and the threshold point SOC2 corresponds to the charging current IC 2;
s4: the initial maximum received current is decreased progressively at a speed [ (IC1-IC2)/T, wherein T is threshold interval time variation ], and the delta SOC of the battery charged in real time in the threshold interval is calculated through an enhanced coulomb counting algorithm;
s5: judging whether the delta SOC plus the SOC1 is equal to the SOC2, if not, continuing to decrease the charging current according to the current rate of the step S4, if so, entering S3;
s6: when the SOC of the battery reaches 80%, stopping charging for 5 min;
s7: setting an intermittent charging current value and an intermittent charging period value, adjusting the charging time of the battery pack by the digital DSP processing unit through an intermittent control circuit, stopping charging when the voltage of the detected battery terminal reaches a threshold voltage, and repeating the charging when the time reaches the intermittent period;
s8: and calculating the negative increase rate of the voltage by detecting the voltage drop value of the battery terminal in the charging stop time, and stopping charging when the negative increase rate of the voltage is less than a threshold value of 5 mv/s.
9. A battery charging system as claimed in claim 8, wherein: the set current value is the reference current of a DSP controller charging control algorithm, the battery information sampling module collects the charging current of the battery, the charging current is compared with the reference current, the generated difference value is compared with the reference current through a PI control algorithm, the duty ratio of a PWM module is adjusted, the conduction time of a switch tube of a full-bridge LLC circuit is controlled through an isolation driving circuit, and the stability of a current loop is further realized.
10. A battery charging system as claimed in claim 8, wherein: the calculation value of the battery SOC is stored in the FLASH module; and when the temperature of the battery collected by the battery information sampling module reaches a preset upper limit threshold value, reducing the charging current, and stopping charging if the temperature continues to rise.
11. The battery charging system of claim 1, wherein the piecewise variable current control algorithm is:
dividing a maximum current charging curve acceptable by a battery into N SOC threshold value intervals, (SOC1-SOC2) is one SOC threshold value interval, IC1 is the maximum acceptable current corresponding to SOC1, IC2 is the maximum acceptable current corresponding to SOC2, a charger charges the battery by IC1, the battery is decreased at a current rate of (IC1-IC2)/T, wherein T is the time required by IC1 to be decreased to IC2, the delta SOC of the battery in the threshold value interval in real time is calculated through an enhanced coulomb counting algorithm, and whether the delta SOC plus the SOC1 is equal to the SOC2 is judged to determine whether to enter the next stage; the PWM module duty cycle of the digital DSP processing unit is adjusted by comparison of the calculated current value IC3 with the sampled battery current value.
12. The battery charging system according to claim 8, wherein the enhanced coulomb counting algorithm is: [ ((IC1-IC3)/2+ IC3) × T ] (IC1- [ (IC1-IC2)/T ] × T), wherein IC3 is a reference value of the output current of the charger, and T is the actual occurrence time of the reduced current.
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| CN202011191974.4A CN112510770B (en) | 2020-10-30 | 2020-10-30 | Storage battery charging system |
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| CN202011191974.4A Active CN112510770B (en) | 2020-10-30 | 2020-10-30 | Storage battery charging system |
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| CN114394004A (en) * | 2021-12-31 | 2022-04-26 | 南京信息工程大学 | Battery car sharing wireless charging device |
| CN115117991A (en) * | 2022-07-28 | 2022-09-27 | 安徽工程大学 | Power battery charging system of permanent magnet synchronous generator system and control method thereof |
| CN115871490A (en) * | 2021-09-29 | 2023-03-31 | 比亚迪股份有限公司 | Vehicle-mounted charger and electric vehicle |
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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| CN115963393B (en) * | 2022-12-28 | 2024-01-05 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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| CN112510770B (en) | 2022-12-27 |
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