CN112072762B - Charging circuit and power terminal - Google Patents
Charging circuit and power terminal Download PDFInfo
- Publication number
- CN112072762B CN112072762B CN202011248198.7A CN202011248198A CN112072762B CN 112072762 B CN112072762 B CN 112072762B CN 202011248198 A CN202011248198 A CN 202011248198A CN 112072762 B CN112072762 B CN 112072762B
- Authority
- CN
- China
- Prior art keywords
- voltage
- charging
- charged
- module
- termination
- 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
Images
Classifications
-
- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
Abstract
The present disclosure relates to a charging circuit and a power terminal, the charging circuit including: the device comprises a charging module, a voltage feedback module and a voltage calibration module, wherein the charging module, the voltage feedback module and the voltage calibration module are respectively used for being connected with a device to be charged, and the charging module and the voltage calibration module are respectively connected with the voltage feedback module; the voltage calibration module is used for acquiring a first termination voltage of the device to be charged when the charging is finished, determining an adjustment parameter of the voltage feedback module according to the first termination voltage and a preset target termination voltage, and adjusting the voltage feedback module according to the adjustment parameter; the voltage feedback module is further used for generating a feedback signal based on the adjusted parameter and the voltage of the device to be charged during the next charging so as to calibrate the termination voltage of the device to be charged. Therefore, the accuracy of the termination voltage of the device to be charged is improved, and the capacity utilization rate of the device to be charged is improved as much as possible on the basis of not generating the overshoot phenomenon.
Description
Technical Field
The present disclosure relates to the field of charging technologies, and in particular, to a charging circuit and a power terminal.
Background
In the broadband power line carrier HPLC communication module, a super capacitor charge-discharge management mechanism is needed to realize the function of reporting power failure. The charging of the super capacitor generally adopts a Constant Current (CC) and Constant Voltage (CV) charging mode, which adopts a constant large current charging mode at the initial stage of charging, when the capacitor voltage reaches a preset charging termination voltage, the charging current is reduced to zero, and the capacitor voltage is maintained to be the preset charging termination voltage, that is, the constant current mode is switched to the constant voltage mode.
In the later stage of constant voltage charging, the preset charging termination voltage of the super capacitor needs to be accurately controlled. If the preset charging termination voltage is low, the problem of low capacity utilization rate of the super capacitor is caused; if the preset charging termination voltage is higher than the rated working voltage of the super capacitor, the overcharge phenomenon can occur, so that the capacity of the capacitor is reduced, and the service life of the capacitor is shortened. The constant-current constant-voltage super capacitor charging circuit based on the LDO structure can generally realize about 5% of voltage precision. That is, in order not to exceed the rated voltage of the super capacitor, the charge termination voltage is set to be about 95% of the rated voltage of the super capacitor to avoid the overshoot phenomenon by sacrificing a part of the capacity utilization rate.
Disclosure of Invention
The purpose of the present disclosure is to provide a charging circuit and a power terminal, so as to achieve the purpose of improving the capacity utilization rate of a device to be charged as much as possible on the basis of not generating an overshoot phenomenon.
In order to achieve the above object, the present disclosure provides a charging circuit including: the device comprises a charging module, a voltage feedback module and a voltage calibration module, wherein the charging module, the voltage feedback module and the voltage calibration module are respectively used for being connected with a device to be charged, and the charging module and the voltage calibration module are respectively connected with the voltage feedback module;
the voltage feedback module is used for generating a feedback signal according to the voltage of the device to be charged and sending the feedback signal to the charging module;
the charging module is used for charging the device to be charged according to the relation between the feedback voltage represented by the feedback signal and the reference voltage;
the voltage calibration module is used for acquiring a first termination voltage of the device to be charged when the charging is finished, determining an adjustment parameter of the voltage feedback module according to the first termination voltage and a preset target termination voltage, and adjusting the voltage feedback module according to the adjustment parameter;
the voltage feedback module is further configured to generate a feedback signal based on the adjusted parameter and the voltage of the device to be charged during next charging, so as to calibrate the termination voltage of the device to be charged.
Optionally, the voltage feedback module includes an adjustable resistor array, a first fixed resistor and a second fixed resistor connected in series in sequence; one end of the adjustable resistor array is used for being connected with one end of the device to be charged, the other end of the adjustable resistor array is connected with one end of the first fixed resistor, the other end of the first fixed resistor is respectively connected with the charging module and one end of the second fixed resistor, and the other end of the second fixed resistor is grounded;
and the voltage calibration module is used for determining a resistance adjustment value in the adjustable resistance array according to a difference value between a first termination voltage of the device to be charged and a preset target termination voltage when the charging is finished.
Optionally, the adjustable resistor array includes N resistors connected in series in sequence and N switches connected in series in sequence, and the N resistors are connected in parallel with the N switches one by one;
the voltage calibration module comprises N output ports, and the N output ports are connected with the N switches one by one;
the voltage calibration module is further configured to determine output signals of the N output ports respectively according to the resistance adjustment value, where the output signals of the output ports are used to control working states of switches connected to the output ports, and the working states include a closed state and an open state.
Optionally, the N resistors have different resistance values, and the ith resistor has a resistance value K times that of the (i-1) th resistor, wherein the value range of i is 2 to N, and K is greater than or equal to 2;
and the product of the ratio of the sum of the resistance values of the N resistors, the first fixed resistor and the second fixed resistor and the resistance value of the second fixed resistor and the reference voltage is greater than or equal to the target termination voltage.
Optionally, the voltage calibration module includes a voltage acquisition chip and a calibration unit, and the voltage acquisition chip is connected to the calibration unit;
the voltage acquisition chip is used for acquiring a first termination voltage of the device to be charged when the charging is finished, and sending the first termination voltage to the calibration unit;
the calibration unit is configured to determine an output signal of each output port of the calibration unit according to a difference between the first termination voltage and the target termination voltage and a voltage increment of the device to be charged corresponding to each resistor of the N resistors.
Optionally, the calibration unit is further configured to adjust the voltage feedback module according to a difference between a second end voltage of the device to be charged and a first preset voltage when the last charging is finished, and a voltage increment of the device to be charged corresponding to each resistor of the N resistors, where the first preset voltage is smaller than the target end voltage.
Optionally, the calibration unit is configured to stop calibration if an absolute value of a difference between the first termination voltage and the target termination voltage is smaller than a voltage increment of the device to be charged corresponding to a resistor with a smallest resistance value among the N resistors.
Optionally, the voltage acquisition chip is a high-precision analog-to-digital converter.
Optionally, the charging module includes: a constant voltage charging unit and a constant current charging unit; the constant-voltage charging unit comprises an operational amplifier and an N-type MOS (metal oxide semiconductor) tube, wherein the non-inverting input end of the operational amplifier is connected with the other end of the first fixed resistor, the inverting input end of the operational amplifier is connected with a reference voltage end to obtain the reference voltage of the device to be charged, and the output end of the operational amplifier is connected with the grid electrode of the N-type MOS tube;
the drain electrode of the N-type MOS tube is connected with the constant current charging unit, and the source electrode of the N-type MOS tube is grounded;
the constant current charging unit is used for performing constant current charging on the device to be charged according to a constant charging current when the voltage VFB output by the other end of the first fixed resistor is smaller than the reference voltage, and performing constant voltage charging on the device to be charged according to the shunted charging current when the voltage VFB output by the other end of the first fixed resistor is larger than or equal to the reference voltage.
A second aspect of the present disclosure provides a power terminal, comprising: a device to be charged and the charging circuit as provided in the first aspect of the present disclosure, the charging circuit being configured to charge the device to be charged.
By the technical scheme, the purpose of calibrating the termination voltage of the device to be charged is achieved by adjusting the parameters of the voltage feedback module, the precision of the termination voltage of the device to be charged is improved, and the capacity utilization rate of the device to be charged is improved as much as possible on the basis of not generating an overshoot phenomenon.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure.
Fig. 1 is a block diagram illustrating a charging circuit in a related art according to an example embodiment.
Fig. 2 is a block diagram illustrating a charging circuit in accordance with an example embodiment.
Fig. 3 is a schematic diagram illustrating a charging circuit in accordance with an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram illustrating a charging circuit in a related art according to an example embodiment. As shown in fig. 1, the charging circuit may include a charging module and a voltage feedback module, wherein the charging module may further include a constant voltage charging unit and a constant current charging unit. The device to be charged can be a super capacitor, a rechargeable battery or any other device capable of constant-current and constant-voltage charging. In fig. 1, the device to be charged is taken as a super capacitor Csuper as an example. The constant-current charging unit is respectively connected with one end of the super capacitor Csuper and the constant-voltage charging unit; the voltage feedback unit is connected with one end of the super capacitor Csuper and is used for feeding back the voltage of the super capacitor Csuper in real time or periodically; the constant-voltage charging unit is respectively connected with the voltage feedback module and the constant-current charging unit and used for determining the size relation between the voltage VFB fed back by the voltage feedback module and the reference voltage VREF, controlling the constant-current charging unit to perform constant-current charging on the super capacitor Csuper by using the generated constant charging current when the VFB is smaller than VREF, and controlling the constant-current charging unit to perform constant-voltage charging on the super capacitor Csuper when the VFB is larger than or equal to VREF so as to realize the stable transition of the super capacitor Csuper from the constant-current charging mode to the constant-voltage charging mode.
In the related art, when a super capacitor is charged, in consideration of the phenomenon that the voltage at two ends of the super capacitor continuously rises during the transition from a constant-current charging mode to a constant-voltage charging mode, in order to avoid the voltage at two ends of the super capacitor exceeding the rated voltage of the super capacitor, the charging termination voltage of the super capacitor is usually set to be about 95% of the rated voltage, and thus, the capacity utilization rate of the super capacitor is low.
In view of this, the present disclosure provides a charging circuit and a power terminal, in which a voltage calibration module is used to calibrate a termination voltage of a device to be charged, so as to ensure that a capacity utilization rate of the device to be charged is improved as much as possible without an overshoot phenomenon.
Fig. 2 is a block diagram illustrating a charging circuit in accordance with an example embodiment. As shown in fig. 2, the charging circuit includes a charging module 201, a voltage feedback module 202, and a voltage calibration module 203. The charging module 201, the voltage feedback module 202 and the voltage calibration module 203 are respectively used for being connected with the device 300 to be charged, and the charging module 201 and the voltage calibration module 203 are respectively connected with the voltage feedback module 202.
Specifically, the voltage feedback module 202 may generate a feedback signal according to the voltage of the device 300 to be charged and send the feedback signal to the charging module 201. Illustratively, one end of the voltage feedback module 202 is connected to one end of the device to be charged, the other end is grounded, and the output end of the voltage feedback module 202 is connected to the charging module 201. In this way, the voltage feedback module 202 may directly detect the voltage of the device 300 to be charged, and then convert the detected voltage of the device 300 to be charged by using the parameters in the voltage feedback module 202, and generate the feedback signal according to the converted voltage. It should be noted that, after the parameters and the conversion manner in the voltage feedback module 202 are known, the voltage of the device to be charged 300 can be determined according to the voltage represented by the feedback signal output by the voltage feedback module 202.
The charging module 201 may be configured to charge the device to be charged 300 according to a relationship between a feedback voltage represented by the received feedback signal and a preset reference voltage. For example, when the feedback voltage is less than the reference voltage, the device 300 to be charged may be considered to be in a charging initial stage, in which the voltage of the device 300 to be charged is generally small, and the charging module 201 may perform constant current charging on the device 300 to be charged with a constant large current for fast charging. When the feedback voltage is greater than or equal to the reference voltage, the device 300 to be charged is considered to be in the end of charging, where the voltage of the device 300 to be charged is already large, and at this time, in order to avoid exceeding the rated voltage, constant voltage charging is performed by using a small current.
The voltage calibration module 203 may be configured to obtain a first end voltage of the device 300 to be charged when the charging is finished, that is, the voltage of the device 300 to be charged when the charging is finished, determine an adjustment parameter of the voltage feedback module 202 according to the first end voltage and a preset target end voltage, and adjust the voltage feedback module 202 according to the adjustment parameter.
The voltage feedback module 202 is further configured to generate a feedback signal based on the adjusted parameter and the voltage of the device to be charged 300 during the next charging, so as to calibrate the termination voltage of the device to be charged 300.
It should be noted that the feedback voltage represented by the feedback signal output by the voltage feedback module 202 is obtained by converting the detected voltage of the device 300 to be charged by using the parameter in the voltage feedback module 202, and therefore, after the parameter of the voltage feedback module 202 is adjusted, the feedback voltage obtained by converting the same voltage of the device 300 to be charged is also different, the magnitude relationship between the feedback voltage and the reference voltage is also changed correspondingly, and accordingly, the terminal voltage of the device 300 to be charged is also changed, thereby achieving the purpose of calibrating the terminal voltage of the device to be charged.
By adopting the technical scheme, the purpose of calibrating the termination voltage of the device to be charged is realized by adjusting the parameters of the voltage feedback module, the precision of the termination voltage of the device to be charged is improved, and the capacity utilization rate of the device to be charged is improved as much as possible on the basis of not generating an overshoot phenomenon.
To facilitate a better understanding of the charging circuit provided by the present disclosure, the charging circuit is described below in connection with a full embodiment.
Fig. 3 is a schematic diagram illustrating a charging circuit in accordance with an exemplary embodiment. As shown in fig. 3, the charging module 201 in fig. 2 may include a constant voltage charging unit 2011 and a constant current charging unit 2012. The constant voltage charging unit 2011 includes an operational amplifier and an N-type MOS transistor (not shown in fig. 3). The non-inverting input end of the operational amplifier is connected with the other end of the first fixed resistor, the inverting input end of the operational amplifier is connected with the reference voltage end to obtain the reference voltage of the device to be charged, and the output end of the operational amplifier is connected with the grid electrode of the N-type MOS tube; the drain electrode of the N-type MOS tube is connected with the constant current charging unit, and the source electrode of the N-type MOS tube is grounded; the constant current charging unit 2012 is configured to perform constant current charging on the device to be charged according to the constant charging current when the voltage VFB output by the other end of the first fixed resistor is less than the reference voltage, and perform constant voltage charging on the device to be charged according to the shunted charging current when the voltage VFB output by the other end of the first fixed resistor is greater than or equal to the reference voltage.
By adopting the technical scheme, when the voltage of the device to be charged is smaller, the device to be charged is charged by utilizing the constant charging current, so that the charging efficiency can be improved. When the voltage of the device to be charged is close to the end voltage, the shunt branch is conducted to reduce the charging current, so that the problem that the performance of the device to be charged is influenced due to overhigh internal temperature if the device to be charged is charged with large current when the current voltage of the device to be charged is close to the end voltage can be solved, and the problems that the capacity of the device to be charged is reduced and the service life of the device to be charged is shortened due to instantaneous overshoot phenomenon if the device to be charged is charged with large current when the voltage of the device to be charged is close to the end voltage can be solved.
In addition, the voltage feedback module 202 in fig. 2 may include an adjustable resistor array, a first fixed resistor, and a second fixed resistor connected in series. As shown in fig. 3, one end of the adjustable resistor array is used to connect to one end of the device 300 to be charged, the other end of the adjustable resistor array is connected to one end of a first fixed resistor, the other end of the first fixed resistor is respectively connected to a charging module (e.g., the constant voltage charging unit 2011 in fig. 3) and one end of a second fixed resistor, and the other end of the second fixed resistor is grounded. In this embodiment, the voltage calibration module 203 is configured to determine a resistance adjustment value in the adjustable resistor array according to a difference between a first end voltage of the device to be charged 300 at the end of the current charging and a preset target end voltage.
In one possible approach, the adjustable resistor array may be a variable resistor, and a sliding piece on the variable resistor may be adjusted to change an effective resistance connected to the voltage feedback module 202, so as to change a magnitude of the voltage VFB fed back by the voltage feedback module 202 and a magnitude of a termination voltage of the device to be charged. A specific manner in which the resistance adjustment value is determined based on the difference between the termination voltage and the target termination voltage will be described below.
In another possible approach, the adjustable resistor array may include N resistors connected in series in sequence and N switches connected in series in sequence (as shown in the dashed box in fig. 3), where the N resistors are connected in parallel with the N switches one by one. For example, the switch may be a MOS transistor, and thus, two ends of one resistor are respectively connected to the drain and the source of one MOS transistor, so as to implement parallel connection of the resistor and the MOS transistor.
In this manner, the voltage calibration module 203 may include N output ports, where the N output ports are connected to N switches one by one, that is, the N output ports of the voltage calibration module 203 are connected to the gates of N MOS transistors one by one. In this way, after determining the resistance adjustment value according to the difference between the first termination voltage and the target termination voltage, the voltage calibration module 203 determines output signals of N output ports according to the resistance adjustment value, where the output signals of the output ports are used to control the operating states of switches connected to the output ports, where the operating states include a closed state and an open state.
For example, assuming that the resistance adjustment value is determined to switch the second resistor and the third resistor in the adjustable resistor array into the voltage feedback module 202, that is, to make the second resistor and the third resistor in the adjustable resistor array effective, the second output port of the voltage calibration module 203 may output an output signal indicating that the second switch connected thereto is open, the third output port may output an output signal indicating that the third switch connected thereto is open, and the other output ports output signals indicating that the switches connected thereto are closed, so that only the first fixed resistor, the second fixed resistor, and the second resistor and the third resistor in the adjustable resistor array are switched into the voltage feedback module 202, and the other resistors of the adjustable resistor array are in a short-circuited state.
It is worth to be noted that, when the MOS transistor is an N-type MOS transistor, the N-type MOS transistor connected to the output port is in an off state when the output port outputs the output signal representing the low level, and the N-type MOS transistor connected to the output port is in an on state when the output port outputs the output signal representing the high level. When the MOS tube is a P-type MOS tube, the P-type MOS tube connected with the output port is in a closed state when the output port outputs the output signal representing the low level, and the P-type MOS tube connected with the output port is in a disconnected state when the output port outputs the output signal representing the high level. In fig. 3, the switch is illustrated as an N-type MOS transistor.
In the disclosure, the resistance values of the N resistors may be the same or different, and the description is given by taking the case that the resistance values of the N resistors are different. In this disclosure, in order to adjust the resistors connected to the voltage feedback module 202, the ith resistor in the adjustable resistor array may be set to be K times the i-1 th resistor, where i ranges from 2 to N. It is worth noting that K is a number greater than or equal to 2, and the smaller the value of K, the more accurate the calibration of the end voltage of the device to be charged, the higher the accuracy of the end voltage of the device to be charged. In the present disclosure, K =2 may be explained.
In practical application, according to the circuit principle, the number of resistors in the adjustable resistor array and the resistance of the resistors need to satisfy the following conditions: the product of the ratio of the sum of the resistances of the N resistors, the first fixed resistor and the second fixed resistor and the resistance of the second fixed resistor and the preset reference voltage is greater than or equal to the target termination voltage. That is, the termination voltage of the device to be charged can be controlled to reach the target termination voltage by adjusting the resistance connected to the voltage feedback module 202.
For example, suppose that seven resistors are included in the adjustable resistor array, the values of the seven resistors are 0.125R0, 0.25R0, 0.5R0, R0, 2R0, 4R0, and 8R0, respectively, and the ratio of R0 to R2 is set to be 0.05. The voltage increment of the device to be charged, which corresponds to 0.125R0, can be calculated to be 7.5mV according to the following formula:
wherein Δ V is a voltage increment of the device to be charged corresponding to 0.125R0, R1 is a resistance value of the first fixed resistor, R2 is a resistance value of the second fixed resistor, and VREF is a reference voltage.
It should be noted that, in the same manner, the voltage increment of the device to be charged corresponding to 0.125R0 is 7.5mV, and the voltage increment of the device to be charged corresponding to 0.25R0 is 15mV, the voltage increment of the device to be charged corresponding to 0.5R0 is 30mV, and the voltage increment of the device to be charged corresponding to … …, 8R0 is 480 mV.
In an embodiment, the voltage calibration module 203 may include a voltage acquisition chip 2031 and a calibration unit 2032, and the voltage acquisition chip 2031 is connected to the calibration unit 2032. The voltage acquisition chip 2031 may be a high-precision analog-to-digital converter, i.e., a high-precision ADC.
The voltage acquisition chip 2031 is configured to be connected to the device to be charged 300, acquire a first end voltage of the device to be charged 300 when the charging is finished, and send the first end voltage to the calibration unit 2032. After receiving the first termination voltage, the calibration unit 2032 determines an output signal of each output unit of the calibration unit 2032 according to a difference between the first termination voltage and a target termination voltage and a voltage increment of the device to be charged corresponding to each of the N resistors. The first termination voltage collected by the voltage collecting chip 2031 may be a voltage that has been calibrated once, or may be a voltage that has not been calibrated.
In one possible approach, the first termination voltage collected by the voltage collecting chip 2031 is a voltage that has been calibrated once. In this manner, the voltage acquisition chip 2031 acquires a second termination voltage of the device to be charged 300 at the end of the last charging and transmits the second termination voltage to the calibration unit 2032. The calibration unit 2032 adjusts the voltage feedback module 202 according to a difference between the second termination voltage and a first preset voltage, and a voltage increment of the device to be charged corresponding to each resistor of the N resistors, where the first preset voltage is smaller than the target termination voltage.
It should be noted that the first predetermined voltage is a theoretically calculated voltage, and a difference between the second termination voltage and the first predetermined voltage may be used to reflect a system error. In the present disclosure, the first preset voltage V may be determined according to the following formula1：
Illustratively, assume a first preset voltage V calculated according to the above formula1If the second end voltage is 2.25V and 2.2V, the system error is 50 mV.
After the difference value between the second termination voltage and the first preset voltage is calculated, the resistance adjustment value is determined according to the difference value and the voltage increment of the device to be charged corresponding to each resistance in the N resistances.
For example, the system error is 50mV, the target termination voltage is 2.70V, and when only the first fixed resistor and the second fixed resistor are connected to the voltage feedback module 202, the termination voltage of the device to be charged has reached 2.25V, and it can be known from the voltage increment of the device to be charged corresponding to each resistor in the foregoing, in the actual charging process, in order to make the target termination voltage of the device to be charged reach 2.70V, only the resistance values corresponding to 450mV need to be increased, that is, the third resistor to the sixth resistor included in the adjustable resistor array are connected to the voltage feedback module 202. Therefore, the third to sixth output ports of the calibration unit 2032 each output an output signal for controlling the N-type MOS transistor connected to the output port to be in an off state, that is, the output ports C2 to C5 of the calibration unit 2032 in fig. 3 each output "0", and the output ports C1, C2 and C6 output "1", where 0 represents low level and 1 represents high level.
Further, for example, when the target end voltage is 2.70V, the first preset voltage is 2.20V, and the second end voltage is 2.25V, the difference between the second end voltage and the first preset voltage is 50mV, the voltage code of C0-C6 corresponding to the first preset voltage 2.20V is 1111111, the difference between the target end voltage 2.70V and the first preset voltage 2.20V is 0.5V, the voltage increment step size in the adjustable resistor array is 7.50mV, that is, the difference between the target end voltage 2.70V and the first preset voltage 2.20V is 66 steps, and the step size corresponding to the error 50mV is 6 steps, so that 60 steps (0111100) are added on the basis of the voltage code corresponding to 2.20V, so that the corresponding voltage code when the end voltage of the device to be charged reaches the target end voltage 2.70V can be 1000011. That is, the output ports C1 to C6 of the calibration unit 2032 in fig. 3 output "1000011".
In the charging process, the adjusted parameter of the voltage feedback module 202 is used to convert the voltage of the device to be charged into the feedback voltage VFB, and the charging module 201 charges the device to be charged based on the relationship between the feedback voltage VFB and the reference voltage, so that the calibration of the termination voltage of the device to be charged can be realized.
By adopting the technical scheme, the first preset voltage which is smaller than the target termination voltage is firstly adopted for calibration, so that the longer discharge waiting time for calibration after the termination voltage of the device to be charged exceeds the target termination voltage can be effectively avoided, the calibration time is shortened, and the calibration efficiency is improved.
It should be noted that, after the parameters of the voltage feedback module 202 are adjusted in the above manner, the termination voltage of the device to be charged can reach the target termination voltage. However, considering that the system error may change when the parameter of the voltage feedback module 202 changes during each charging process, the termination voltage of the device to be charged may be collected again to determine whether the termination voltage reaches the target termination voltage.
Therefore, at the end of this charging, the voltage acquiring chip 2031 acquires a first termination voltage of the device to be charged 300 at the end of this charging, and sends the first termination voltage to the calibration unit 2032. The calibration unit 2032 determines an output signal of each output port of the calibration unit 2032 according to a difference between the first termination voltage and the target termination voltage and a voltage increment of the device to be charged corresponding to each resistor of the N resistors.
For example, if the absolute value of the difference between the first termination voltage and the target termination voltage is smaller than the voltage increment (e.g., 7.5 mV) of the device to be charged corresponding to the resistor with the smallest resistance value among the N resistors, the first termination voltage may be considered to be closer to the target termination voltage, and the calibration may be stopped without recalibration. If the absolute value of the difference between the first termination voltage and the target termination voltage is greater than or equal to the voltage increment (e.g., 7.5 mV) of the device to be charged corresponding to the resistor with the smallest resistance value among the N resistors, the resistance value in the voltage feedback module 202 needs to be adjusted again.
For example, if the first termination voltage is greater than the target termination voltage, the resistance value in the access voltage feedback module 202 is decreased, and if the first termination voltage is less than the target termination voltage, the resistance value in the access voltage feedback module 202 is increased. The increased or decreased resistance value can be determined in the above manner, and will not be described herein again.
Based on the same inventive concept, the present disclosure also provides an electric power terminal, including: the charging circuit that waits charging device and this disclosure provided, charging circuit is used for waiting charging device to charge.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (9)
1. A charging circuit, comprising: the device comprises a charging module, a voltage feedback module and a voltage calibration module, wherein the charging module, the voltage feedback module and the voltage calibration module are respectively used for being connected with a device to be charged, and the charging module and the voltage calibration module are respectively connected with the voltage feedback module;
the voltage feedback module is used for generating a feedback signal according to the voltage of the device to be charged and sending the feedback signal to the charging module;
the charging module is used for charging the device to be charged according to the relation between the feedback voltage represented by the feedback signal and the reference voltage;
the voltage calibration module is used for acquiring a first termination voltage of the device to be charged when the charging is finished, determining an adjustment parameter of the voltage feedback module according to the first termination voltage and a preset target termination voltage, and adjusting the voltage feedback module according to the adjustment parameter;
the voltage feedback module is further used for generating a feedback signal based on the adjusted parameter and the voltage of the device to be charged during the next charging so as to calibrate the termination voltage of the device to be charged;
the voltage feedback module comprises an adjustable resistor array, a first fixed resistor and a second fixed resistor which are sequentially connected in series; one end of the adjustable resistor array is used for being connected with one end of the device to be charged, the other end of the adjustable resistor array is connected with one end of the first fixed resistor, the other end of the first fixed resistor is respectively connected with the charging module and one end of the second fixed resistor, and the other end of the second fixed resistor is grounded;
and the voltage calibration module is used for determining a resistance adjustment value in the adjustable resistance array according to a difference value between a first termination voltage of the device to be charged and a preset target termination voltage when the charging is finished.
2. The charging circuit of claim 1, wherein the adjustable resistor array comprises N resistors connected in series in sequence and N switches connected in series in sequence, and the N resistors are connected in parallel with the N switches one by one;
the voltage calibration module comprises N output ports, and the N output ports are connected with the N switches one by one;
the voltage calibration module is further configured to determine output signals of the N output ports respectively according to the resistance adjustment value, where the output signals of the output ports are used to control working states of switches connected to the output ports, and the working states include a closed state and an open state.
3. The charging circuit according to claim 2, wherein the N resistors have different resistance values, and the ith resistor has a resistance value K times that of the (i-1) th resistor, wherein i has a value ranging from 2 to N, and K is greater than or equal to 2;
and the product of the ratio of the sum of the resistance values of the N resistors, the first fixed resistor and the second fixed resistor and the resistance value of the second fixed resistor and the reference voltage is greater than or equal to the target termination voltage.
4. The charging circuit of claim 2, wherein the voltage calibration module comprises a voltage acquisition chip and a calibration unit, and the voltage acquisition chip is connected with the calibration unit;
the voltage acquisition chip is used for acquiring a first termination voltage of the device to be charged when the charging is finished, and sending the first termination voltage to the calibration unit;
the calibration unit is configured to determine an output signal of each output port of the calibration unit according to a difference between the first termination voltage and the target termination voltage and a voltage increment of the device to be charged corresponding to each resistor of the N resistors.
5. The charging circuit of claim 4, wherein the calibration unit is further configured to adjust the voltage feedback module according to a difference between a second end voltage of the device to be charged when the last charging is finished and a first preset voltage, and a voltage increment of the device to be charged corresponding to each of the N resistors, wherein the first preset voltage is smaller than the target end voltage.
6. The charging circuit according to claim 4, wherein the calibration unit is configured to stop calibration if an absolute value of a difference between the first termination voltage and the target termination voltage is smaller than a voltage increment of the device to be charged corresponding to a resistor with a smallest resistance value among the N resistors.
7. The charging circuit of claim 4, wherein the voltage acquisition chip is a high precision analog to digital converter.
8. The charging circuit of any one of claims 1-7, wherein the charging module comprises: a constant voltage charging unit and a constant current charging unit; the constant-voltage charging unit comprises an operational amplifier and an N-type MOS (metal oxide semiconductor) tube, wherein the non-inverting input end of the operational amplifier is connected with the other end of the first fixed resistor, the inverting input end of the operational amplifier is connected with a reference voltage end to obtain the reference voltage of the device to be charged, and the output end of the operational amplifier is connected with the grid electrode of the N-type MOS tube;
the drain electrode of the N-type MOS tube is connected with the constant current charging unit, and the source electrode of the N-type MOS tube is grounded;
the constant current charging unit is used for performing constant current charging on the device to be charged according to a constant charging current when the voltage VFB output by the other end of the first fixed resistor is smaller than the reference voltage, and performing constant voltage charging on the device to be charged according to the shunted charging current when the voltage VFB output by the other end of the first fixed resistor is larger than or equal to the reference voltage.
9. An electrical power terminal, comprising: a device to be charged and a charging circuit as claimed in any one of claims 1 to 8 for charging the device to be charged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248198.7A CN112072762B (en) | 2020-11-10 | 2020-11-10 | Charging circuit and power terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011248198.7A CN112072762B (en) | 2020-11-10 | 2020-11-10 | Charging circuit and power terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112072762A CN112072762A (en) | 2020-12-11 |
| CN112072762B true CN112072762B (en) | 2021-01-29 |
Family
ID=73655513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011248198.7A Active CN112072762B (en) | 2020-11-10 | 2020-11-10 | Charging circuit and power terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112072762B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112769195A (en) * | 2021-02-03 | 2021-05-07 | 李登洋 | Intelligent management method for safe charging of new energy battery pack |
| CN115842396B (en) * | 2022-12-30 | 2023-10-24 | 飞杨电源技术(深圳)有限公司 | Automatic calibration circuit and method for output voltage of charger |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081095A (en) * | 1998-03-13 | 2000-06-27 | Denso Corporation | Voltage balancer device for combination battery |
| CN102662148A (en) * | 2012-05-09 | 2012-09-12 | 中国农业大学 | On-line feedback battery state of charge (SOC) predicting method |
| CN103475079A (en) * | 2013-09-02 | 2013-12-25 | 四川川奇机电有限责任公司 | Charging circuit, charger with same, and charging system |
| CN104348194A (en) * | 2013-07-26 | 2015-02-11 | 无锡华润矽科微电子有限公司 | Electric vehicle charging control circuit and calibration method thereof |
| CN111602310A (en) * | 2018-02-02 | 2020-08-28 | 深圳市柔宇科技有限公司 | Charging device and charging correction method |
-
2020
- 2020-11-10 CN CN202011248198.7A patent/CN112072762B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081095A (en) * | 1998-03-13 | 2000-06-27 | Denso Corporation | Voltage balancer device for combination battery |
| CN102662148A (en) * | 2012-05-09 | 2012-09-12 | 中国农业大学 | On-line feedback battery state of charge (SOC) predicting method |
| CN104348194A (en) * | 2013-07-26 | 2015-02-11 | 无锡华润矽科微电子有限公司 | Electric vehicle charging control circuit and calibration method thereof |
| CN103475079A (en) * | 2013-09-02 | 2013-12-25 | 四川川奇机电有限责任公司 | Charging circuit, charger with same, and charging system |
| CN111602310A (en) * | 2018-02-02 | 2020-08-28 | 深圳市柔宇科技有限公司 | Charging device and charging correction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112072762A (en) | 2020-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8354820B2 (en) | Analog photovoltaic power circuit | |
| CN112072762B (en) | Charging circuit and power terminal | |
| JP4888041B2 (en) | Battery voltage regulator | |
| JP5482221B2 (en) | Analog circuit | |
| TW583816B (en) | Regulator circuit and control method thereof | |
| CN111934404B (en) | Charging circuit | |
| CN216851374U (en) | Pre-charging circuit and chip | |
| US6906498B2 (en) | Device and method for the detection of a charging voltage | |
| CN107342741B (en) | APD bias voltage control circuit, photoelectric receiving circuit and bias voltage control method | |
| CN211627773U (en) | Multichannel charging and discharging parameter calibration system | |
| CN109975586B (en) | Constant-current electronic load circuit and working method thereof | |
| CN216670106U (en) | Power switch overcurrent detection circuit and current detection circuit | |
| CN115236481B (en) | High-precision current detection method and chip module thereof | |
| US9825584B2 (en) | Sampling duration control for power transfer efficiency | |
| US8853994B2 (en) | Analog photovoltaic power circuit | |
| CN113098236B (en) | Switching power supply and output voltage compensation circuit thereof | |
| CN113013940A (en) | System for calculating battery capacity by using protection board and charger | |
| CN112285590A (en) | Voltage detection system, battery management system and battery management chip | |
| CN107579570B (en) | Voltage sampling control method, voltage sampling control circuit and adapter | |
| CN111010180A (en) | Analog-to-digital converter calibration system and method | |
| CN214626468U (en) | Power device and battery management system | |
| CN116154927B (en) | Current detection circuit, constant current circuit and battery charge-discharge protection system | |
| CN216718624U (en) | Electronic load for lithium battery test | |
| CN109274153B (en) | Temperature compensation circuit for charging energy storage module and charger | |
| CN113300426A (en) | Power device, battery management system and detection circuit |
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 | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: Room 401, 4th floor, building 3, No. 8, Beichen East Road, Chaoyang District, Beijing 100101 Patentee after: Beijing thinking Semiconductor Technology Co.,Ltd. Address before: 100029 room 4042, 4th floor, building 3, No.2 Minzu Yuan Road, Chaoyang District, Beijing Patentee before: Beijing thinking Semiconductor Technology Co.,Ltd. |