CN114696428A - Control circuit for parallel charging of multiple chargers - Google Patents

Control circuit for parallel charging of multiple chargers Download PDF

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Publication number
CN114696428A
CN114696428A CN202210473692.6A CN202210473692A CN114696428A CN 114696428 A CN114696428 A CN 114696428A CN 202210473692 A CN202210473692 A CN 202210473692A CN 114696428 A CN114696428 A CN 114696428A
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CN
China
Prior art keywords
output
parallel
charging
circuit
resistor
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Pending
Application number
CN202210473692.6A
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Chinese (zh)
Inventor
艾纯
侯春明
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Chongqing Senci Electric Machinery Co Ltd
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Chongqing Senci Electric Machinery Co Ltd
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Priority to CN202210473692.6A priority Critical patent/CN114696428A/en
Publication of CN114696428A publication Critical patent/CN114696428A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/40—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries adapted for charging from various sources, e.g. AC, DC or multivoltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a control circuit for charging a plurality of chargers in parallel, which comprises n chargers connected in parallel, a voltage comparison circuit, a PWM (pulse-width modulation) control circuit, a charging output circuit and a constant voltage sampling circuit, wherein the n chargers are connected in parallel; the negative pole of the charger is grounded, the positive pole of the charger is respectively connected with the input end of the voltage comparison circuit and the voltage input end of the charging output circuit, the output end of the voltage comparison circuit is connected with the input end of the PWM control circuit, the output end of the PWM control circuit is connected with the signal input end of the charging output circuit, and the output end of the charging output circuit is connected with the constant voltage sampling circuit in parallel and then outputs voltage to the rechargeable battery. The voltage comparison circuit compares the input voltage of the charger with a set value, and controls the duty ratio of the PWM circuit to be reduced when the output input is smaller than the set value, so that the charging output voltage is reduced, the output voltage of the charger is always stabilized at the set value, and the output current is output according to the constant current value of each charger, so that the aim of parallel charging of a plurality of charger output ports is fulfilled.

Description

Control circuit for parallel charging of multiple chargers
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a control circuit for charging a plurality of chargers in parallel.
Background
The product needs pluralism, for example, the energy storage power supply product of charging, can be according to the different demands of different customers, to the difference of the speed charging time and the use scene of charging, the optional charger that joins in marriage. The user can purchase several chargers again with the accessory form as required to accomplish charging fast, and a plurality of chargers are parallelly connected and are used simultaneously. If there is no related control circuit and chargers with the same specification are directly used in parallel, power distribution is uneven, and the chargers are damaged.
Disclosure of Invention
The invention provides a control circuit for parallel charging of a plurality of chargers with the same specification, aiming at the problem that the charger is damaged due to uneven power distribution in the direct parallel charging of the plurality of chargers in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a control circuit for charging a plurality of chargers in parallel comprises n charging input interfaces, a voltage comparison circuit, a PWM (pulse-width modulation) control circuit, a charging output circuit and a constant voltage sampling circuit which are connected in parallel;
the n parallel charging input interfaces are respectively connected with the input end of the voltage comparison circuit and the voltage input end of the charging output circuit, the output end of the voltage comparison circuit is connected with the input end of the PWM control circuit, the output end of the PWM control circuit is connected with the signal input end of the charging output circuit, and the output end of the charging output circuit is connected with the constant voltage sampling circuit and then outputs voltage to the rechargeable battery.
Preferably, the voltage comparison circuit comprises a comparator U1:
the n parallel charging input interfaces are connected with one end of a first resistor, and the other end of the first resistor and one end of a second resistor are connected in parallel and then connected with the non-inverting input end of a comparator U1; the other end of the second resistor and one end of the fourth resistor are connected in parallel and then grounded, the other end of the fourth resistor and one end of the third resistor are connected in parallel and then connected with the inverting input end of a comparator U1, the other end of the third resistor is connected with 5V voltage, and the output end of a comparator U1 is connected with a PWM control circuit.
Preferably, the device further comprises a compensation circuit:
the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the third capacitor, and the other end of the third capacitor is connected with the output end of the U1.
Preferably, the PWM control circuit includes a PWM control module:
the output end of the comparator U1 is connected with the negative electrode of the first diode, the positive electrode of the first diode is respectively connected with the COMP port of the PWM control module and one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the fourth capacitor, the other end of the fourth capacitor is connected with the FB end of the PWM control module, and the GND end of the PWM control module is grounded.
Preferably, the charging output circuit includes a DC/DC power device module:
the positive electrodes of the n parallel chargers are respectively connected with the voltage input end of the DC/DC power device module and one end of the first capacitor, and the other end of the first capacitor is grounded; the output end of the DC/DC power device module is connected with one end of a first inductor, the other end of the first inductor and one end of a second capacitor are connected in parallel and then output voltage to the anode of the rechargeable battery, and the cathode of the rechargeable battery is grounded; the other end of the second capacitor is grounded.
Preferably, the constant voltage sampling circuit is:
one end of the seventh resistor is connected with the anode of the rechargeable battery, the other end of the seventh resistor and one end of the eighth resistor are connected in parallel and then connected with the FB end of the PWM control module, and the other end of the eighth resistor and the other end of the second capacitor are connected in parallel and then grounded.
Preferably, the n parallel chargers have the same output voltage.
In summary, due to the adoption of the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:
the invention compares the input voltage of the charger with the set value through the voltage comparison circuit, when the input voltage is smaller than the set value, the duty ratio of the PWM control circuit is reduced, thereby reducing the output voltage of the charging output circuit, simultaneously reducing the charging power, enabling the output voltage of the charger to be always stabilized at the set value, and outputting the output current according to the constant current value of each charger, thereby achieving the purpose of parallel charging of a plurality of charger output ports.
Description of the drawings:
fig. 1 is a schematic diagram of a control circuit for parallel charging of multiple chargers according to an exemplary embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in FIG. 1, the control circuit for charging a plurality of chargers in parallel according to the present invention includes N (N ≧ 1, and is a positive integer) chargers (charging input 1, charging input 2, charging input N) connected in parallel, a voltage comparison circuit, a PWM control circuit, a charging output circuit, and a constant voltage sampling circuit.
The negative poles of the n parallel chargers are grounded, the positive poles of the n parallel chargers are respectively connected with the input end of the voltage comparison circuit and the voltage input end of the charging output circuit, the output end of the voltage comparison circuit is connected with the input end of the PWM control circuit, the output end of the PWM control circuit is connected with the signal input end of the charging output circuit, and the output end of the charging output circuit is connected with the constant voltage sampling circuit and then outputs voltage to the rechargeable battery.
The voltage comparison circuit compares the input electricity of the n parallel chargers with a set value, when the input electricity is smaller than the set value, the duty ratio of the PWM control circuit is reduced, so that the output voltage of the charging output circuit is reduced, the charging power is reduced, the output voltage of the chargers is always stabilized at the set value, the output current is output according to the constant current value of each charger, and the purpose of parallel charging of a plurality of charger output ports is achieved.
In this embodiment, the voltage comparison circuit includes a comparator U1:
the anodes of the n parallel chargers are connected with one end of a first resistor R1, and the other end of the first resistor R1 and one end of a second resistor R2 are connected in parallel and then connected with the non-inverting input end of a comparator U1; the other end of the second resistor R2 is connected in parallel with one end of the fourth resistor R4 and then grounded (CHIGND), the other end of the fourth resistor R4 and one end of the third resistor R3 are connected in parallel and then connected with the inverting input end of the comparator U1, the other end of the third resistor R3 is connected with 5V (REF5V), and the output end of the comparator U1 is connected with the PWM control circuit.
In this embodiment, the reference voltage formed by R3 and R4 is compared with the charger input voltage detected by R1 and R2 (considering the subtraction of the line loss as appropriate, for example, 0.6V), and when the charger input voltage VIN is lower than the set value, that is, the voltage at the non-inverting input terminal of U1 is lower than that at the inverting input terminal, the output terminal of U1 outputs a low level.
In this embodiment, the apparatus further includes a compensation circuit:
the other end of the fourth resistor R4 is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with one end of a third capacitor C3, and the other end of the third capacitor C3 is connected with the output end of the U1.
In this embodiment, the PWM control circuit includes a DC/DC _ PWM control module 11:
the output end of the comparator U1 is connected with the negative electrode of the first diode D1, the positive electrode of the first diode D1 is respectively connected with the COMP port of the PWM control module and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected with one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is connected with the FB end of the PWM control module, and the GND end of the PWM control module is grounded.
The output end of the U1 outputs low level, the COMP port of the PWM control module is pulled down through the D1, the duty ratio is reduced, a PWM signal is sent out to control the DC/DC power device module 12 (the DC/DC power device module 12 is composed of power devices such as a plurality of MOS transistors and auxiliary circuits, and is used for performing DC/DC conversion on the input power voltage, which is an existing circuit module), the output voltage VOUT is reduced, and the charging power is reduced, so that the input power VIN of the charger is always stabilized at a set value, that is, the charger outputs a constant voltage value. Therefore, even if the charging current is relatively large in the initial charging stage, each charger (as long as the output voltage of the charger is the same, the output current can be different) is output at the maximum constant current value, and the charger cannot be damaged; the charging current is reduced in the later charging period, the charging power is reduced, and even if the power distribution is uneven, the charger cannot be damaged.
In this embodiment, the charging output circuit includes the DC/DC power device module 12:
the anodes of the n parallel chargers are respectively connected with the voltage input end of the DC/DC power device module and one end of a first capacitor C1, and the other end of the first capacitor C1 is grounded; the grounding end of the DC/DC power device module is grounded; the output end of the DC/DC power device module is connected with one end of a first inductor L1, the other end of the first inductor L1 and one end of a second capacitor C2 are connected in parallel, then, a voltage VOUT is output to the anode (+) of the rechargeable battery, and the cathode (-) of the rechargeable battery is grounded; the other terminal of the second capacitor C2 is connected to ground.
In this embodiment, the constant voltage sampling circuit is used to determine the constant voltage value of the charging, and the specific circuit is:
one end of the seventh resistor R7 is connected to the positive electrode of the rechargeable battery, the other end of the seventh resistor R7 and one end of the eighth resistor R8 are connected in parallel and then connected to the FB terminal of the PWM control module, and the other end of the eighth resistor R8 is connected in parallel and then grounded to the other end of the second capacitor C2.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (7)

1. A control circuit for charging a plurality of chargers in parallel is characterized by comprising n parallel charging input interfaces, a voltage comparison circuit, a PWM control circuit, a charging output circuit and a constant voltage sampling circuit;
the n parallel charging input interfaces are respectively connected with the input end of the voltage comparison circuit and the voltage input end of the charging output circuit, the output end of the voltage comparison circuit is connected with the input end of the PWM control circuit, the output end of the PWM control circuit is connected with the signal input end of the charging output circuit, and the output end of the charging output circuit is connected with the constant voltage sampling circuit and then outputs voltage to the rechargeable battery.
2. The control circuit for parallel charging of multiple chargers of claim 1, wherein the voltage comparison circuit comprises a comparator U1:
the n parallel charging input interfaces are connected with one end of a first resistor, and the other end of the first resistor and one end of a second resistor are connected in parallel and then connected with the non-inverting input end of a comparator U1; the other end of the second resistor is connected with one end of a fourth resistor in parallel and then is grounded, the other end of the fourth resistor and one end of a third resistor are connected with the inverting input end of a comparator U1 in parallel, the other end of the third resistor is connected with 5V voltage, and the output end of a comparator U1 is connected with a PWM control circuit.
3. The control circuit for parallel charging of a plurality of chargers according to claim 2, further comprising a compensation circuit:
the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the third capacitor, and the other end of the third capacitor is connected with the output end of the U1.
4. The control circuit for parallel charging of multiple chargers of claim 1, wherein the PWM control circuit comprises a PWM control module:
the output end of the comparator U1 is connected with the negative electrode of the first diode, the positive electrode of the first diode is respectively connected with the COMP port of the PWM control module and one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the fourth capacitor, the other end of the fourth capacitor is connected with the FB end of the PWM control module, and the GND end of the PWM control module is grounded.
5. The control circuit for parallel charging of multiple chargers according to claim 1, wherein the charging output circuit comprises a DC/DC power device module:
the positive electrodes of the n parallel chargers are respectively connected with the voltage input end of the DC/DC power device module and one end of the first capacitor, and the other end of the first capacitor is grounded; the output end of the DC/DC power device module is connected with one end of a first inductor, the other end of the first inductor and one end of a second capacitor are connected in parallel and then output voltage to the anode of the rechargeable battery, and the cathode of the rechargeable battery is grounded; the other end of the second capacitor is grounded.
6. The control circuit for parallel charging of a plurality of chargers according to claim 1, wherein the constant voltage sampling circuit is:
one end of the seventh resistor is connected with the anode of the rechargeable battery, the other end of the seventh resistor and one end of the eighth resistor are connected in parallel and then connected with the FB end of the PWM control module, and the other end of the eighth resistor and the other end of the second capacitor are connected in parallel and then grounded.
7. A control circuit for parallel charging of multiple chargers as claimed in claim 1, characterised in that the n parallel chargers have the same output voltage.
CN202210473692.6A 2022-04-29 2022-04-29 Control circuit for parallel charging of multiple chargers Pending CN114696428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210473692.6A CN114696428A (en) 2022-04-29 2022-04-29 Control circuit for parallel charging of multiple chargers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210473692.6A CN114696428A (en) 2022-04-29 2022-04-29 Control circuit for parallel charging of multiple chargers

Publications (1)

Publication Number Publication Date
CN114696428A true CN114696428A (en) 2022-07-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210473692.6A Pending CN114696428A (en) 2022-04-29 2022-04-29 Control circuit for parallel charging of multiple chargers

Country Status (1)

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CN (1) CN114696428A (en)

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