CN113410880A - Charging circuit and charging control method - Google Patents

Charging circuit and charging control method Download PDF

Info

Publication number
CN113410880A
CN113410880A CN202110546421.4A CN202110546421A CN113410880A CN 113410880 A CN113410880 A CN 113410880A CN 202110546421 A CN202110546421 A CN 202110546421A CN 113410880 A CN113410880 A CN 113410880A
Authority
CN
China
Prior art keywords
voltage
charging
detection
circuit
coupled
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.)
Pending
Application number
CN202110546421.4A
Other languages
Chinese (zh)
Inventor
杨士弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitac Computer Kunshan Co Ltd
Getac Technology Corp
Original Assignee
Mitac Computer Kunshan Co Ltd
Getac Technology Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitac Computer Kunshan Co Ltd, Getac Technology Corp filed Critical Mitac Computer Kunshan Co Ltd
Priority to CN202110546421.4A priority Critical patent/CN113410880A/en
Publication of CN113410880A publication Critical patent/CN113410880A/en
Pending legal-status Critical Current

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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a charging circuit and a charging control method, wherein the charging control method comprises the following steps: receiving an input voltage, receiving a detection voltage related to the input voltage by using the control unit, outputting a conduction voltage by using the control unit when the detection voltage falls into a working range, generating a working voltage to a detection pin of the charging unit according to the conduction voltage, outputting a charging current by using the charging unit when the detection pin receives the working voltage, and not outputting the conduction voltage by using the control unit when the input voltage falls out of the working range; the charging circuit includes: the power supply comprises a power supply input end, a power supply output end, a voltage detection circuit, a control unit, a conversion unit and a charging unit. The charging circuit and the charging control method of the invention replace the charging integrated circuit by the control unit to monitor the input voltage and control the operation of the charging integrated circuit accordingly, thereby improving the applicable range of the input voltage and simultaneously avoiding the leakage current at the power output end when the charging is not carried out.

Description

Charging circuit and charging control method
The invention is a divisional application, the application number of the original application is 201810388987.7, and the application date of the original application is 2018, 4 months and 27 days.
Technical Field
The embodiment of the invention relates to the technical field of charging, in particular to a charging circuit and a charging control method.
Background
With the development of technology, portable electronic products such as mobile phones, notebook computers, or tablet computers are becoming popular and more powerful. Under the condition that the external power supply cannot be connected, the portable electronic product needs to be supplied with power required by operation by a rechargeable battery equipped with the portable electronic product.
When the power of the rechargeable battery is exhausted, the user can connect the charger to the external power supply and charge the rechargeable battery by the charger.
Disclosure of Invention
In a first aspect, an embodiment of the present invention provides a charge control method, which includes receiving an input voltage; receiving a detection voltage related to the input voltage by using a control unit; when the detection voltage falls into a working range, the control unit is utilized to output a breakover voltage; generating a working voltage to a detection pin of a charging unit according to the conducting voltage; outputting a charging current based on the input voltage by using the charging unit when the detection pin receives the working voltage; when the detection voltage is out of the working range, the control unit is used for not outputting the breakover voltage.
Optionally, the charging unit has an allowable range, the operating voltage falls within the allowable range, and the operating range is greater than the allowable range.
Optionally, when the detection pin does not receive the working voltage, the charging unit is prohibited from outputting the charging current.
Optionally, the step of generating the working voltage according to the turn-on voltage includes: the operating voltage is generated by dividing the turn-on voltage.
Optionally, the step of generating the working voltage according to the turn-on voltage includes: generating the operating voltage by dividing a predetermined voltage in the presence of the turn-on voltage; the step of not outputting the turn-on voltage by the control unit includes: the voltage of the detection pin is pulled down to the ground by the control unit.
Optionally, the method further includes: the input voltage is divided to generate the detection voltage.
In a second aspect, an embodiment of the present invention further provides a charging circuit, which includes a power input terminal, a power output terminal, a voltage detection circuit, a control unit, a conversion unit, and a charging unit. The power input end is used for receiving an input voltage. The power output end is used for outputting charging current. The voltage detection circuit is coupled to the power input terminal and is used for outputting a detection voltage according to the input voltage. Wherein, the detection voltage is related to the input voltage. The control unit is coupled to the voltage detection circuit and is used for detecting the voltage detection. When the detection voltage falls into the working range, the control unit outputs a conducting voltage. When the detection voltage is out of the working range, the control unit does not output the conducting voltage. The conversion unit is coupled to the control unit and is used for outputting the working voltage according to the conducting voltage. The charging unit is coupled between the power input end and the power output end. The charging unit is provided with a detection pin, and the detection pin is coupled with the conversion unit. When the detection pin receives the working voltage, the charging unit generates a charging current according to the input voltage.
Optionally, the charging unit has an allowable range, the operating voltage falls within the allowable range, and the operating range is greater than the allowable range.
Optionally, the charging unit does not output the charging current when the detection pin does not receive the working voltage.
Optionally, the converting unit includes a first voltage dividing element and a second voltage dividing element, a first end of the second voltage dividing element is coupled to the control unit, a second end of the second voltage dividing element is coupled between the detecting pin and the first end of the first voltage dividing element, a second end of the first voltage dividing element is coupled to ground, and the operating voltage is a divided voltage of the on-state voltage on the first voltage dividing element.
Optionally, the converting unit includes a first voltage dividing element and a second voltage dividing element, a first end of the second voltage dividing element is coupled to a predetermined voltage, a second end of the second voltage dividing element is coupled to the control unit, the detecting pin and a first end of the first voltage dividing element, the first voltage dividing element is coupled to ground, and the operating voltage is a divided voltage of the predetermined voltage on the first voltage dividing element.
Optionally, the voltage detection circuit includes a plurality of voltage division elements, the voltage division elements are electrically connected between the power input terminal and ground, a connection point between the voltage division elements is coupled to the control unit, and the voltage detection circuit is configured to divide the input voltage.
During the charging process, a charging Integrated Circuit (IC) inside the charger detects the input voltage and limits the range of the input voltage to protect the safety of the back-end circuit, thereby limiting the application range, such as: the external power provided by the vehicle battery, the adapter (adapter) with different voltage, etc. cannot be used directly. In view of the above, the present disclosure provides a charging circuit and a charging control method, in which a control unit replaces a charging IC to monitor an input voltage and control the operation of the charging IC, so as to increase the applicable range of the input voltage and prevent a leakage current from occurring at a power output terminal when the charging IC is not charged.
Drawings
Fig. 1 is a schematic structural diagram of a charging circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a charging control method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a conversion unit in a charging circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a conversion unit in another charging circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a voltage detection circuit in a charging circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a connection relationship between a charging circuit and an external circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a charging circuit according to an embodiment of the present invention, and referring to fig. 1, the charging circuit 10 includes:
a power input terminal Ni receiving an input voltage Vi;
the power supply output end No outputs charging current Io;
a voltage detection circuit 170, coupled to the power input terminal Ni, for outputting a detection voltage Vd according to an input voltage Vi, where the detection voltage Vd is related to the input voltage Vi;
the control unit 110, coupled to the voltage detection circuit 170, detects the detection voltage Vd according to the working range, wherein when the detection voltage Vd falls within the working range, the control unit 110 outputs the on-state voltage So, and when the detection voltage Vd falls outside the working range, the control unit 110 does not output the on-state voltage So;
a converting unit 130, coupled to the control unit 110, for outputting a working voltage Sa according to the on-state voltage So; and
the charging unit 150 is coupled between the power input terminal Ni and the power output terminal No, the charging unit 150 has a detection pin Pdt, the detection pin Pdt is coupled to the converting unit 130, wherein when the detection pin Pdt receives the working voltage Sa, the charging unit 130 generates a charging current Io according to the input voltage Vi.
That is, the control unit 110 is electrically connected to the power input terminal Ni. The converting unit 130 is coupled between the control unit 110 and the charging unit 150. The charging unit 150 is coupled between the power input terminal Ni and the power output terminal No. Herein, the charging unit 150 has a detecting pin Pdt, and the detecting pin Pdt is coupled to the converting unit 130. The voltage detecting circuit 170 is coupled between the power input terminal Ni and the control unit 110. Here, the control unit 110 has an operating range.
The charging control method provided by the embodiment of the invention comprises the following steps: receiving an input voltage Vi; receiving a detection voltage Vd related to an input voltage Vi by using a control unit; when the detection voltage Vd falls into the working range, outputting a conducting voltage So by using a control unit; generating a working voltage Sa to a detection pin Pdt of the charging unit according to the conducting voltage So; when the detection pin Pdt receives the working voltage Sa, the charging unit is used to output a charging current Io based on the input voltage Vi; when the detection voltage Vd falls outside the working range, the control unit does not output the on-state voltage So. The charging unit is based on the input voltage Vi, i.e., the working voltage Sa received by the detection pin Pdt. Fig. 2 is a flowchart of a charging control method according to an embodiment of the present invention, and referring to fig. 2, the method includes:
s10, receiving the input voltage.
And S11, generating a detection voltage related to the input voltage.
And S12, receiving the detection voltage.
S13, whether the input voltage falls within the operating range. If yes, go to step S14-step S16; if not, steps S17-S19 are executed.
S14, the control unit outputs a turn-on voltage.
S15, generating a working voltage to the detecting pin of the charging unit according to the conducting voltage.
S16, the charging unit generates a charging current according to the input voltage.
S17, the control unit does not output the on voltage.
S18, no operating voltage is generated.
S19, the charging unit stops operating.
Specifically, referring to fig. 1 and 2, the power input terminal Ni receives an input voltage Vi of a power supply (not shown in fig. 1) external to the charging circuit 10 (i.e., step S10 in fig. 2 is executed). The voltage detecting circuit 170 retrieves the input voltage Vi to generate a detecting voltage Vd corresponding to the input voltage Vi (i.e., execute step S11 in fig. 2). The control unit 110 receives the detection voltage Vd (i.e., performs step S12 in fig. 2), and confirms whether the detection voltage Vd falls within the operating range (i.e., performs step S13 in fig. 2). Here, the detection voltage Vd and the input voltage Vi have a fixed proportional relationship. Alternatively, the input voltage Vi is divided to generate the detection voltage Vd. That is, the detection voltage Vd is a divided voltage of the input voltage Vi.
Optionally, the step of generating the working voltage Sa according to the turn-on voltage So includes: generating an operating voltage Sa by dividing a predetermined voltage in the presence of a turn-on voltage So; and wherein the step of not outputting the on-voltage So by the control unit 110 includes: the voltage of the detection pin Pdt is pulled down to ground by the control unit 110.
Optionally, the step of generating the working voltage Sa according to the turn-on voltage So includes: the operating voltage Sa is generated by dividing the on voltage So.
When the detection voltage Vd falls within the operation range, the control unit 110 outputs an on-voltage So to the converting unit 130 (i.e., performs step S14 in fig. 2). The converting unit 130 generates the operating voltage Sa to the detecting pin Pdt of the charging unit 150 according to the on-voltage So (i.e., step S15 in fig. 2 is executed). When the detection pin Pdt receives the working voltage Sa, the charging unit 150 generates the charging current Io according to the input voltage Vi (i.e., performs step S16 in fig. 2).
When the detection voltage Vd falls outside the operating range, the control unit 110 does not output the on-voltage So (i.e., step S17 in fig. 2); at this time, the converting unit 130 cannot generate the operating voltage Sa to the detecting pin Pdt of the charging unit 150 (i.e., step S18 in fig. 2 is executed), so that the charging unit 150 stops operating (i.e., step S19 in fig. 2 is executed). Optionally, the charging unit 150 may include a charging Integrated Circuit (IC)151, a switch circuit 153, and an output stage circuit 155. The charging IC 151 is electrically connected to the power input terminal Ni. The switch circuit 153 is electrically connected between the power input terminal Ni and the output stage circuit 155. Here, a current detecting resistor Rs1 is coupled between the power input terminal Ni and the switch circuit 153. The output stage circuit 155 is coupled between the output stage circuit 155 and the power supply output terminal No. Here, the output stage circuit 155 includes an output inductor L and a current detection resistor Rs 2. The output inductor L is coupled to the switch circuit 153, and the current detecting resistor Rs2 is coupled between the output inductor L and the power output terminal No. Optionally, the output stage circuit 155 further includes an output capacitor, and the output capacitor is coupled between the power output No and ground.
In a normal operation state of the charging IC 151, the charging IC 151 detects the input current Ii through the current detection resistor Rs1, detects the charging current Io through the current detection resistor Rs2, and/or detects the output voltage Vo, and controls the operation of the switch circuit 153 according to the detection result of the input current Ii, the charging current Io, and/or the output voltage Vo. Under the control of the charging IC 151, the switch circuit 153 receives the input current Ii through the current sensing resistor Rs1 and controls the charging and discharging time of the output inductor L based on the input current Ii, so that the output stage circuit 155 can output a stable dc output voltage, i.e., provide the charging current Io to an external load (e.g., a battery module) through the power output terminal No.
Optionally, the switch circuit 153 includes a first transistor M1 and a second transistor M2. The control terminal G1 of the first transistor M1 and the control terminal G2 of the second transistor M2 are coupled to the charging IC 151. The first terminal D1 of the first transistor M1 is electrically connected to the power input terminal Ni through a current detecting resistor Rs 1. The second terminal S1 of the first transistor M1 and the first terminal D2 of the second transistor M2 are coupled to each other and commonly coupled to the output inductor L of the output stage circuit 155 and the charging IC 151. The second terminal S2 of the second transistor M2 is coupled to ground.
Optionally, the charging IC 151 has a plurality of pins externally, and the pins include the detection pin Pdt, the input current detection pins Pan and Pap, the command input pin Ps2, the current limiting pin Pii, the current feedback pin Pio, the switch control pins Phd and Pld, the driving output pin Prg, the switch driving pins Pbt and Pph, and the output current detection pins Psn and Psp.
The input current detection pins Pan and Pap are respectively electrically connected to two ends of the current detection resistor Rs1, and measure the input current Ii through the current detection resistor Rs 1. The output current detection pins Psn and Psp are respectively electrically connected to two ends of the current detection resistor Rs2, and measure the charging current Io through the current detection resistor Rs 2. The command input pin Ps2 is electrically connected to the control unit 110. When the control unit 110 determines that the detection voltage Vd falls within the operating range, the control unit 110 outputs the control command Sc to the command input pin Ps2 in addition to the on-voltage So. Optionally, the command input pin Ps2 and the control unit 110 may be coupled via a bus. Wherein the Bus may be, for example, but not limited to, a System Management Bus (SMBus, or SMB).
The current limiting pin Pii is electrically connected to the control unit 110 and receives the current limit from the control unit 110. The current feedback pin Pio is electrically connected to the control unit 110, and outputs a feedback current to the control unit 110 according to the input current Ii or the charging current Io. The switch control pins Phd and Pld are coupled to the control terminals G1 and G2 of the switch circuit 153. The charging IC 151 outputs a switching signal to the switch circuit 153 via the switch control pins Phd, Pld to control the switch circuit 153. The driving output pin Prg is electrically connected to the switch driving pins Pbt and Pph through an external diode and a capacitor, respectively. The charging IC 151 outputs a driving signal via the driving output pin Prg, and drives the internal switching signal output circuit via the switching driving pins Pbt and Pph. The switch driving pin Pph is further coupled to the switch circuit 153 (the second terminal S1 of the first transistor M1 and the first terminal D2 of the second transistor M2). Optionally, the first terminal D1 and the second terminal S1 of the first transistor M1 can be a drain and a source, respectively, and the control terminal G1 of the first transistor M1 can be a gate. Alternatively, the first terminal D2 and the second terminal S2 of the second transistor M2 can be a drain and a source, respectively, and the control terminal G2 of the second transistor M2 can be a gate.
Optionally, the charging unit 150 has an allowable range, the operating voltage Sa falls within the allowable range, and the operating range is greater than the allowable range.
Illustratively, the charging IC 151 has an allowable range, and the aforementioned operating voltage Sa falls within the allowable range. Also, the operating range of the control unit 110 is greater than the allowable range. Here, the allowable range is a voltage range formed by the first voltage value and the second voltage value, and the first voltage value and the second voltage value are two fixed values different from each other. In other words, the operating voltage Sa is between the first voltage value and the second voltage value. Illustratively, the first voltage value and the second voltage value may be 2.4V and 3.15V, respectively.
Optionally, the working range is a voltage range formed by the third voltage value and the fourth voltage value. The third voltage value may be smaller than the first voltage value, and/or the fourth voltage value may be smaller than the second voltage value. Illustratively, the size of the operating range depends on the withstand voltage of the control unit 110.
Optionally, the charging IC 151 may detect whether the voltage signal received by the detection pin Pdt falls within an allowable range. Here, when the voltage signal received by the detection pin Pdt falls within the allowable range (i.e., the detection pin Pdt receives the operating voltage Sa), the charging IC 151 generates an appropriate signal. Here, when the voltage signal received by the detection pin Pdt does not fall within the allowable range (i.e., the detection pin Pdt does not receive the operating voltage Sa), the charging IC 151 does not generate an appropriate signal. For example, the operating voltage Sa may be a voltage signal with a first level. In other words, when the voltage signal is at the second level different from the first level, it indicates that the detection pin Pdt does not receive the working voltage Sa. Optionally, the charging unit 150 does not output the charging current Io when the detection pin Pdt does not receive the working voltage Sa.
Optionally, the pin of the charging IC 151 may further include a notification pin (not shown in fig. 1), and the notification pin is used for a notification signal. Illustratively, the notification signal has two different levels (hereinafter referred to as a third level and a fourth level). Wherein the notification signal of the third level is the appropriate signal. In other words, when the notification pin outputs the notification signal of the fourth level, it indicates that the charging IC 151 does not generate an appropriate signal.
Optionally, the charging IC 151 may include a start circuit, an output circuit, a bus interface, a voltage-current comparison circuit, a selection circuit, a PWM (pulse width modulation) circuit, and a switching signal generation circuit.
Optionally, when the detection pin Pdt does not receive the working voltage Sa, the charging unit 150 is prohibited from outputting the charging current Io. The start circuit is coupled between the detection pin Pdt and the driving output pin Prg. The start circuit generates a driving signal according to the working voltage Sa received by the detection pin Pdt and outputs the driving signal through the driving output pin Prg. For example, the start-up circuit may include a first comparator, a second comparator, a logic element, and a generator. The first comparator is coupled to the detection pin Pdt. The first comparator compares the voltage level (e.g., the operating voltage Sa) of the detection pin Pdt with a wake-up voltage value to generate a first comparison result. The second comparator is coupled to a power supply pin (not shown in fig. 1). The second comparator compares the detection pin Pdt with a power supply upper limit to generate a second comparison result. The logic element is coupled to the output of the first comparator, the output of the second comparator and the input of the signal generator. The logic element generates an activation signal to the signal generator according to the first comparison result and the second comparison result so as to enable the signal generator to output the driving signal. The wake-up voltage is a fixed value, such as 0.6V. The upper limit of the power supply is a fixed value, for example, 3.75V.
The input end of the output circuit is coupled with the switch signal generating circuit, and the input end of the output circuit is coupled with the switch control pins Phd and Pld. The driving end of the output circuit is coupled to the start circuit and the switch driving pins Pbt and Pph. In other words, when the detection pin Pdt receives the working voltage Sa, the start circuit generates the driving signal to drive the output circuit to output the switching signal generated by the switching signal generating circuit to the control terminals G1 and G2 of the switching circuit 153 through the switch control pins Phd and Pld. On the contrary, when the detection pin Pdt does not receive the working voltage Sa, the start circuit does not generate the driving signal, so that the output circuit is turned off; at this time, the charging IC 151 stops operating (i.e., the charging unit 150 is inhibited from outputting the charging current Io).
Optionally, the bus interface is coupled to the command input pin Ps2 and receives the control command Sc from the control unit 110 via the command input pin Ps 2. Wherein, the control command Sc may include: a first current reference, a second current reference, a voltage reference, a selection signal, and an enable signal.
The voltage-current comparison circuit is electrically connected to the command input pin Ps2 and is coupled to the input current detection pins Pan and Pap, the current limit pin Pii and the output current detection pins Psn and Psp. The voltage-current comparison circuit detects the input current Ii according to a first current reference to generate a first detection result, detects the charging current Io according to a second current reference to generate a second detection result, detects the output voltage Vo measured by the output detection pin Psn according to the voltage reference to generate a third detection result, and limits the input current Ii according to the current received by the current limiting pin Pii to generate a fourth detection result. For example, in the voltage-current comparison circuit, the first differential amplifier measures the input current Ii through the input current detection pins Pan and Pap, and the second differential amplifier calculates a first difference (a first detection result) between the measured value of the input current Ii and the first current reference. The third differential amplifier measures the charging current Io via the output current sensing pins Psn and Psp, and calculates a second difference (second detection result) between the measured value of the charging current Io and the second current reference. The fifth differential amplifier is coupled to the output current detection pin Psn through a voltage division circuit. The fifth differential amplifier receives the feedback value of the output voltage Vo through the output current detection pin Psn and the voltage division circuit, and calculates a third difference (a third detection result) between the feedback value of the output voltage Vo and the voltage reference. The sixth differential amplifier is coupled to the current-limiting pin Pii and the output of the third differential amplifier, and calculates a fourth difference (a fourth detection result) between the measured value of the charging current Io and the current limit. And then, the summing circuit integrates the first difference value, the second difference value, the third difference value and the fourth difference value and outputs the integrated value to the PWM circuit.
The selection circuit is coupled between the voltage-current comparison circuit and the current feedback pin Pio. The selection circuit outputs the measurement value of the charging current Io or the measurement value of the charging current Io by the voltage and current comparison circuit according to the selection signal. In connection with the above example, the input terminal of the selection circuit is coupled to the output of the first differential amplifier and the output of the third differential amplifier, and the output terminal of the selection circuit is coupled to the current feedback pin Pio. The control terminal of the selection circuit is coupled to the bus interface.
The PWM circuit generates a PWM signal according to the first detection result, the second detection result, the third detection result and the fourth detection result.
The switching signal generating circuit is coupled between the PWM circuit and the output circuit. The switching signal generating circuit generates a switching signal according to the PWM signal when receiving the start signal. In other words, when the control unit 110 determines that the detection voltage Vd falls within the operating range, the control unit 110 outputs the on voltage So and, at the same time, outputs the control command Sc to the charging IC 151. The switching signal generating circuit in the charging IC 151 operates normally due to the enable signal in the control command Sc. On the contrary, when the control unit 110 determines that the detection voltage Vd does not fall within the operating range, the control unit 110 does not output the on voltage So and also does not output the control command Sc to the charging IC 151. The switching signal generation circuit in the charging IC 151 is turned off because the start signal is not received; at this time, the charging IC 151 stops operating (i.e., the charging unit 150 is inhibited from outputting the charging current Io).
Fig. 3 is a schematic structural diagram of a conversion unit in a charging circuit according to an embodiment of the present invention, optionally, referring to fig. 1 and fig. 3, the conversion unit 130 includes a first voltage dividing element R11 and a second voltage dividing element R12, a first end of the second voltage dividing element R12 is coupled to a predetermined voltage, a second end of the second voltage dividing element R12 is coupled to the control unit 110, the detection pin Pdt and a first end of the first voltage dividing element R11, the first voltage dividing element R11 is coupled to ground, and the operating voltage Sa is a divided voltage of the predetermined voltage on the first voltage dividing element R11.
For example, the converting unit 130 may be a voltage dividing circuit, and the voltage dividing circuit includes two voltage dividing elements (hereinafter, referred to as a first voltage dividing element R11 and a second voltage dividing element R12). The first terminal of the second voltage divider R12 is coupled to a voltage source (providing a predetermined voltage VCC), and the second terminal of the second voltage divider R12 is coupled to the control unit 110, the detection pin Pdt and the first terminal of the first voltage divider R11. A second end of the first voltage dividing element R11 is coupled to ground. Here, the on voltage So is at a high level, and the operating voltage Sa is a divided voltage of the predetermined voltage VCC across the first voltage dividing device R11. On the contrary, when the control unit 110 determines that the detection voltage Vd does not fall within the working range, the control unit 110 directly pulls down the potential of the detection pin Pdt to the low level, i.e., does not output the on-state voltage So.
Fig. 4 is a schematic structural diagram of a conversion unit in another charging circuit according to an embodiment of the present invention, optionally, referring to fig. 1 and fig. 4, the conversion unit 130 includes a first voltage dividing element R21 and a second voltage dividing element R22, a first end of the second voltage dividing element R22 is coupled to the control unit 110, a second end of the second voltage dividing element R22 is coupled between the detection pin Pdt and a first end of the first voltage dividing element R21, a second end of the first voltage dividing element R21 is coupled to ground, and the working voltage Sa is a divided voltage of the on-state voltage So on the first voltage dividing element R21.
For example, the converting unit 130 may be a voltage dividing circuit, and the voltage dividing circuit includes two voltage dividing elements (hereinafter, referred to as a first voltage dividing element R21 and a second voltage dividing element R22). The first end of the second voltage divider R22 is coupled to the control unit 110, and the second end of the second voltage divider R22 is coupled to the detection pin Pdt of the charging unit 150 and the first end of the first voltage divider R21. A second end of the first voltage dividing element R21 is coupled to ground. Here, the operating voltage Sa is a divided voltage of the on voltage So at the first voltage dividing element R21.
Fig. 5 is a schematic structural diagram of a voltage detection circuit in a charging circuit according to an embodiment of the present invention, optionally, referring to fig. 1 and 5, optionally, the voltage detection circuit 170 includes a plurality of voltage division elements, the voltage division elements are electrically connected between the power input terminal Ni and ground, a connection point between the voltage division elements is coupled to the control unit 110, and the voltage detection voltage Vd is a divided voltage of the input voltage Vi.
For example, the voltage detecting circuit 170 may be a voltage dividing circuit, and the voltage dividing circuit includes two voltage dividing elements (hereinafter, referred to as a third voltage dividing element R31 and a fourth voltage dividing element R32). The fourth voltage dividing element R32 and the third voltage dividing element R31 are connected in series between the power input terminal Ni and ground. The junction between the third pressure dividing element R31 and the fourth pressure dividing element R32 is coupled to the control unit 110. Here, the detection voltage Vd is a divided voltage of the input voltage Vi, that is, a divided voltage of the input voltage Vi at the third voltage dividing element R31.
Optionally, with continued reference to fig. 1, the charging circuit 10 may further include a voltage regulator circuit 190. The voltage stabilizing circuit 190 is coupled between the power input terminal Ni and the charging unit 150. That is, the voltage stabilizing circuit 190 receives the input voltage Vi through the power input terminal Ni and provides the stable input voltage Vi to the back-end circuit (the charging unit 150) accordingly. Illustratively, the voltage regulator circuit 190 is one or more zener diodes connected in parallel between the power input terminal Ni and the charging unit 150.
Alternatively, the control unit 110 may be implemented by a microcontroller.
Optionally, fig. 6 is a schematic diagram of a connection relationship between a charging circuit and an external circuit according to an embodiment of the present invention, and referring to fig. 6, a power output terminal No of the charging circuit 10 is adapted to be coupled to a battery module 20. For example, when the charging circuit 10 is a circuit inside a stand-alone charging device (e.g., a charger, a charging stand, etc.), the power output No may be a connector adapted to electrically connect to the battery module 20. Here, the charging circuit 10 outputs the generated charging current Io to the battery module 20 through the connector, thereby charging the battery module 20. For example, when the charging circuit 10 is a circuit built in an electronic device (such as a portable electronic product like a mobile phone, a notebook computer, or a tablet computer), the power output No may be a circuit contact, and the circuit contact is electrically connected to the battery module 20. Here, the charging circuit 10 can output the generated charging current Io to the battery module 20, so as to charge the battery module 20.
Optionally, the power input terminal Ni of the charging circuit 10 is adapted to be coupled to an adapter circuit 30. The adapter circuit 30 is used to provide an input voltage Vi. The circuit structure of the adapter circuit 30 is well known in the art and therefore not described in detail.
In summary, according to the charging circuit and the charging control method of any embodiment of the present invention, the control unit 110 replaces the charging IC to monitor the input voltage Vi and accordingly controls the operation of the charging IC 151, so as to increase the applicable range of the input voltage Vi and prevent the leakage current at the power output No when the charging is not performed.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (13)

1. A charge control method, comprising:
receiving an input voltage;
receiving a detection voltage related to the input voltage by using a control unit;
when the detection voltage falls into a working range, the control unit is utilized to output a breakover voltage;
generating a working voltage to a detection pin of a charging unit according to the conducting voltage;
when the detection pin receives the working voltage, the charging unit is utilized to output a charging current based on the input voltage; and
when the detection voltage is out of the working range, the control unit is used for not outputting the breakover voltage.
2. The charge control method according to claim 1, wherein the charging unit has an allowable range, the operating voltage falls within the allowable range, and the operating range is greater than the allowable range.
3. The charge control method according to claim 1, further comprising:
and when the detection pin does not receive the working voltage, the charging unit is prohibited from outputting the charging current.
4. The charge control method of claim 1, wherein the step of generating the operating voltage according to the turn-on voltage comprises: the operating voltage is generated by dividing the turn-on voltage.
5. The charge control method of claim 1, wherein the step of generating the operating voltage according to the turn-on voltage comprises: generating the operating voltage by dividing a predetermined voltage in the presence of the turn-on voltage; the step of not outputting the turn-on voltage by the control unit includes: the voltage of the detection pin is pulled down to the ground by the control unit.
6. The charge control method according to claim 1, further comprising: the input voltage is divided to generate the detection voltage.
7. A charging circuit, comprising:
a power input terminal for receiving an input voltage;
a power supply output end for outputting a charging current;
a voltage detecting circuit coupled to the power input terminal for outputting a detecting voltage according to the input voltage, wherein the detecting voltage is related to the input voltage;
a control unit coupled to the voltage detecting circuit and detecting the detection voltage according to a working range, wherein the control unit outputs a turn-on voltage when the detection voltage falls within the working range, and does not output the turn-on voltage when the detection voltage falls outside the working range;
a conversion unit coupled to the control unit for outputting a working voltage according to the on-state voltage; and
the charging unit is coupled between the power input end and the power output end and is provided with a detection pin which is coupled with the conversion unit, wherein when the detection pin receives the working voltage, the charging unit generates a charging current according to an input voltage.
8. The charging circuit of claim 7, wherein the charging unit has an allowable range, the operating voltage falls within the allowable range, and the operating range is greater than the allowable range.
9. The charging circuit of claim 7, wherein the charging unit does not output the charging current when the detection pin does not receive the operating voltage.
10. The charging circuit of claim 7, wherein the converting unit comprises a first voltage dividing element and a second voltage dividing element, a first end of the second voltage dividing element is coupled to the control unit, a second end of the second voltage dividing element is coupled between the detecting pin and the first end of the first voltage dividing element, a second end of the first voltage dividing element is coupled to ground, and the operating voltage is a divided voltage of the conducting voltage on the first voltage dividing element.
11. The charging circuit of claim 7, wherein the converting unit comprises a first voltage divider and a second voltage divider, a first end of the second voltage divider is coupled to a predetermined voltage, a second end of the second voltage divider is coupled to the control unit, the detecting pin and a first end of the first voltage divider, the first voltage divider is coupled to ground, and the operating voltage is a divided voltage of the predetermined voltage on the first voltage divider.
12. The charging circuit of claim 7, wherein the voltage-sensing circuit comprises a plurality of voltage-dividing elements electrically connected between the power input terminal and ground, a connection point between the voltage-dividing elements is coupled to the control unit, and the voltage-sensing voltage is a divided voltage of the input voltage.
13. A storage medium containing computer-executable instructions for performing the charge control method of any one of claims 1-6 when executed by a computer processor.
CN202110546421.4A 2018-04-27 2018-04-27 Charging circuit and charging control method Pending CN113410880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110546421.4A CN113410880A (en) 2018-04-27 2018-04-27 Charging circuit and charging control method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110546421.4A CN113410880A (en) 2018-04-27 2018-04-27 Charging circuit and charging control method
CN201810388987.7A CN110417067A (en) 2018-04-27 2018-04-27 Charging circuit and charge control method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201810388987.7A Division CN110417067A (en) 2018-04-27 2018-04-27 Charging circuit and charge control method

Publications (1)

Publication Number Publication Date
CN113410880A true CN113410880A (en) 2021-09-17

Family

ID=68346158

Family Applications (2)

Application Number Title Priority Date Filing Date
CN202110546421.4A Pending CN113410880A (en) 2018-04-27 2018-04-27 Charging circuit and charging control method
CN201810388987.7A Withdrawn CN110417067A (en) 2018-04-27 2018-04-27 Charging circuit and charge control method

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN201810388987.7A Withdrawn CN110417067A (en) 2018-04-27 2018-04-27 Charging circuit and charge control method

Country Status (1)

Country Link
CN (2) CN113410880A (en)

Also Published As

Publication number Publication date
CN110417067A (en) 2019-11-05

Similar Documents

Publication Publication Date Title
JP3905005B2 (en) Portable device and semiconductor integrated circuit device
US6452364B1 (en) Battery charge control circuit, battery charging device, and battery charge control method
US7847519B2 (en) Smart battery protector with impedance compensation
US8350408B2 (en) Power management circuit
US7781908B2 (en) Output power port management control
KR100991634B1 (en) Over-voltage protected battery charger with bypass
US9048672B2 (en) Semiconductor integrated circuit, protection circuit and battery pack
CN102570545B (en) Charge control circuit
JP6053280B2 (en) Charging circuit and electronic device using the same
JP2015211541A (en) Charging circuit, power management circuit, and electronic apparatus employing the same
JP2013132183A (en) Charging circuit and electronic equipment using the same
CN115085302A (en) Double-battery charging and discharging circuit, control method and electronic equipment
US9906053B2 (en) Energy storage device and control method thereof
JP2011083093A (en) Charge control method and charge control circuit
CN113410880A (en) Charging circuit and charging control method
US6909619B2 (en) Spike control apparatus for DC-DC converter
TWI661648B (en) Charging circuit and charging-controlling method
KR20140120025A (en) Charging circuit for rechareable battery, battery charger with the same and charging method for rechareable battery
US10608457B2 (en) Charging circuit and method of controlling charging
EP4329171A1 (en) Power management chip, electronic device having the same, and operating method thereof
US11606031B1 (en) Power supply circuit with low quiescent current in bypass mode
CN213341741U (en) Power supply control circuit
JP5347460B2 (en) Integrated circuit device for secondary battery protection and inspection method for integrated circuit device for secondary battery protection
KR20040088264A (en) Circuit for guarding reverse voltage and overvoltage in Personal Digital Assistant
TW202409791A (en) Power management chip and operating method thereof

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