CN210380337U - Charging chip supporting flexible input and output - Google Patents
Charging chip supporting flexible input and output Download PDFInfo
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- CN210380337U CN210380337U CN201921647259.XU CN201921647259U CN210380337U CN 210380337 U CN210380337 U CN 210380337U CN 201921647259 U CN201921647259 U CN 201921647259U CN 210380337 U CN210380337 U CN 210380337U
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Abstract
The utility model discloses a charging chip supporting flexible input and output, which comprises a preceding stage transformation module, a first field effect tube, a second field effect tube, a voltage sampling processing circuit, a closed-loop control circuit, a controlled current source circuit, a CC/CV control module and a driving circuit, wherein the preceding stage transformation module, the first field effect tube, the second field effect tube, the voltage sampling processing circuit, the closed-loop control circuit and the controlled current source circuit form a closed-loop system, and the voltage feedback end of the preceding stage transformation module is input to the control current source by collecting the voltage drop on the first field effect tube and the second field effect tube, thereby changing the output voltage of the preceding stage transformation module, realizing the real-time adjustment of the charging voltage of the battery, on one hand, the charging voltage requirements of different types of batteries and different combined batteries are met, on the other hand, the chip is not dependent on the topological structure of the preceding stage transformation module, the limitation of the charging chip on input is reduced, and practical scenes and application range are greatly expanded.
Description
Technical Field
The utility model relates to a battery charging technology field, concretely relates to support nimble input/output's charging chip.
Background
Along with the wide application of portable electronic products, manage the application of the chip that charges of its inside battery, avoided the battery to appear overcharging, the problem of excessive pressure, guaranteed the charging safety of battery. The linear charging chip is also rapidly developed due to its low price and simple control.
However, the conventional linear charging chip has a fixed input voltage, large power consumption and high temperature rise in the charging process, generally only aims at low-voltage input and low-current charging of a single battery, and is not applicable to applications such as high charging voltage of the battery itself or high voltage required by series connection of a plurality of batteries, so that the application range of the conventional linear charging chip is very limited.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the current charging chip can only charge to low pressure and single section little battery, the utility model aims to provide a can be through gathering the voltage on battery voltage and the field effect transistor, and then adjust charging voltage in real time to satisfy the charging chip that different voltage batteries charge.
The utility model discloses the technical scheme who adopts does:
a charging chip supporting flexible input and output comprises a preceding stage conversion module, wherein a voltage output end of the preceding stage conversion module is electrically connected with a battery to form a charging loop, and a first field effect tube and a second field effect tube are connected in series between the voltage output end of the preceding stage conversion module and the battery;
the charging chip also comprises a CC/CV control module which collects the voltage and the current of the battery and respectively drives the first field effect tube and the second field effect tube through a driving circuit;
the charging chip also comprises a preceding stage control module which respectively collects the voltage of the voltage output end of the preceding stage conversion module, the voltage of a battery and the voltage between the first field effect tube and the second field effect tube;
the output end of the preceding stage control module is respectively electrically connected with the voltage feedback end of the preceding stage conversion module, one end of a first resistor and one end of a second resistor, the other end of the first resistor is electrically connected with the voltage output end of the preceding stage conversion module, and the other end of the second resistor is grounded;
the preceding stage control module enables the preceding stage conversion module to regulate output voltage in real time according to the voltage on the voltage feedback end and the first resistor.
Preferably, the preceding stage control module comprises a voltage sampling processing circuit, a closed-loop control circuit and a controlled current source circuit which are electrically connected in sequence;
the voltage sampling processing circuit is used for respectively collecting the voltage and the battery voltage of the voltage output end of the preceding stage conversion module and the voltage between the first field effect transistor and the second field effect transistor;
the output end of the controlled current source circuit is used as the output end of the preceding stage control module and is electrically connected with the voltage feedback end of the preceding stage conversion module, one end of the first resistor and one end of the second resistor.
Preferably, the voltage sampling processing circuit comprises a first operational amplifier, a second operational amplifier, a third operational amplifier and a fourth operational amplifier, wherein the fourth operational amplifier is provided with three input ends;
the non-inverting input end of the first operational amplifier is electrically connected with the drain electrode of the first field effect transistor, the non-inverting input end of the second operational amplifier is electrically connected with the source electrode of the first field effect transistor and the source electrode of the second field effect transistor respectively, and the non-inverting input end of the third operational amplifier is electrically connected with the drain electrode of the second field effect transistor;
the output end and the inverting input end of the first operational amplifier are respectively and electrically connected with the first input end of the fourth operational amplifier, the output end and the inverting input end of the second operational amplifier are respectively and electrically connected with the second input end of the fourth operational amplifier, the output end and the inverting input end of the third operational amplifier are respectively and electrically connected with the third input end of the fourth operational amplifier, and the output end of the fourth operational amplifier is electrically connected with the input end of the closed-loop control circuit.
Preferably, the closed-loop control circuit comprises a fifth operational amplifier, a third resistor, a first capacitor and a second capacitor;
the non-inverting input end of the fifth operational amplifier is used as the input end of the closed-loop control circuit and is electrically connected with the output end of the voltage sampling processing circuit;
the non-inverting input end of the fifth operational amplifier is further electrically connected with one end of the first capacitor and one end of the second capacitor, the other end of the first capacitor is electrically connected with one end of the third resistor, and the other end of the third resistor and the other end of the second capacitor are respectively electrically connected with the output end of the fifth operational amplifier;
and the output end of the fifth operational amplifier is used as the output end of the closed-loop control circuit and is electrically connected with the input end of the controlled current source circuit.
Preferably, the controlled current source circuit comprises a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor and a triode;
one end of the third capacitor, one end of the fourth capacitor and one end of the fourth resistor are respectively electrically connected with the output end of the closed-loop control circuit, the other end of the fourth resistor is electrically connected with the base electrode of the triode, the collector electrode of the triode is electrically connected with one end of the fifth resistor, the other end of the fourth capacitor is electrically connected with one end of the sixth resistor, the other end of the sixth resistor is electrically connected with the other end of the fifth resistor, the sixth resistor serves as the output end of the preceding stage control module and is electrically connected with the voltage feedback end of the preceding stage conversion module;
the other end of the sixth resistor is also electrically connected with a voltage output end of the preceding stage conversion module, and the other end of the third capacitor is grounded with an emitting electrode of the triode.
Optimally, the driving circuit comprises a driving sub-circuit and an anti-reverse driving sub-circuit;
the input end of the driving sub-circuit is electrically connected with the first output end of the CC/CV control module, and the output end of the driving sub-circuit is electrically connected with the grid electrode of the second field effect transistor;
the input end of the anti-reverse driving sub-circuit is electrically connected with the second output end of the CC/CV control module, and the output end of the anti-reverse driving sub-circuit is electrically connected with the grid electrode of the first field effect transistor.
Preferably, the pre-stage conversion module is any one of a dc step-down circuit, a boost circuit, a step-up/step-down circuit or an ac-to-dc conversion circuit.
Preferably, the first fet Q1 and the second fet Q2 are both N-type fets or P-type fets.
The utility model has the advantages that:
(1) the utility model relates to a support nimble input/output's chip that charges, the utility model discloses be provided with the first field effect transistor and the second field effect transistor of establishing ties in proper order between the voltage output end of preceding stage transform module and battery to gather voltage on the voltage output end, voltage and battery voltage between first field effect transistor and the second field effect transistor in real time through preceding stage control module, and feed back the voltage of gathering to preceding stage transform module in real time, and preceding stage transform module then adjusts output voltage according to the voltage of gathering in real time, and the power supply battery charges.
Through the design, the preceding stage control module collects the voltage drop between the output voltage of the preceding stage conversion module and the voltage of the battery and feeds the voltage drop back to the preceding stage converter in real time, the preceding stage converter adjusts the output voltage of the preceding stage converter in real time according to the feedback voltage and the voltage on the first resistor, and therefore a closed loop system is formed.
(2) Because the output voltage of the battery voltage acquired by the preceding stage control module can be adjusted in real time by the preceding stage conversion module, the output voltage can be dynamically adjusted along with the change of the battery voltage, the battery is charged by the most appropriate voltage, and the charging efficiency of the battery is further ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a charging chip provided by the present invention.
Fig. 2 is a pin diagram of the charging chip provided by the present invention.
Fig. 3 is another pin diagram of the charging chip provided by the present invention.
Detailed Description
The invention will be further elucidated with reference to the embodiments described hereinafter. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
The term "and/or" herein is merely an association relationship describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Furthermore, the particular features, structures, functions, or characteristics may be combined in any suitable manner in one or more embodiments. For example, a first embodiment may be combined with a second embodiment as long as the particular features, structures, functions, or characteristics associated with the two embodiments are not mutually exclusive.
Example one
As shown in fig. 1 to 3, the charging chip supporting flexible input and output provided by this embodiment includes a preceding stage conversion module, a voltage output terminal V0 of the preceding stage conversion module is electrically connected to a battery to form a charging loop, and a first field effect transistor Q1 and a second field effect transistor Q2 are connected in series between the voltage output terminal V0 of the preceding stage conversion module and the battery.
The charging chip also comprises a CC/CV control module which collects the voltage and the current of the battery and respectively drives the first field-effect tube Q1 and the second field-effect tube Q2 through the driving circuit.
The charging chip further comprises a preceding stage control module which respectively collects the voltage of a voltage output end V0 of the preceding stage conversion module, the voltage of a battery and the voltage between the first field effect transistor Q1 and the second field effect transistor Q2.
The output end Adj of the preceding stage control module is electrically connected with the voltage feedback end FB of the preceding stage conversion module, one end of a first resistor R1 and one end of a second resistor R2 respectively, the other end of the first resistor R1 is electrically connected with the voltage output end V0 of the preceding stage conversion module, and the other end of the second resistor R2 is grounded.
The preceding stage control module enables the preceding stage conversion module to regulate the output voltage in real time according to the voltage on the voltage feedback end FB and the first resistor R1.
As shown in fig. 1, the following describes a charging chip supporting flexible input and output specifically:
the first fet Q1 and the second fet Q2 are connected in series between the voltage output terminal V0 of the preceding stage converter module and the battery in sequence, as shown in fig. 1, the voltage output terminal V0 of the preceding stage converter module is electrically connected to the drain of the first fet Q1, the source of the first fet Q1 is electrically connected to the source of the second fet Q2, and the drain of the second fet Q2 is electrically connected to the battery, i.e., the voltage output terminal V0 of the preceding stage converter module forms a charging loop with the battery via the first fet Q1 and the second fet Q2.
Therefore, the voltage of three endpoints, namely the voltage at the voltage output end V0 of the preceding stage conversion module, the voltage between the first field effect transistor Q1 and the second field effect transistor Q2 and the battery voltage, is collected by the preceding stage control module, and finally the voltage drop between the voltage output end V0 and the battery voltage can be obtained and input into the preceding stage conversion module through the voltage feedback end FB, so that the preceding stage conversion module can adjust the output voltage in real time according to the feedback voltage and the voltage on the first resistor R1 to charge the battery.
As shown in fig. 1, a voltage formula of the voltage output terminal V0 of the preceding stage conversion module can be obtained:
in the formula, V0Is the voltage at the voltage output terminal V0, VFBIs the voltage at the voltage feedback terminal FB, and IsThen it flows from the controlled current source circuit and through R1Current of R1、R2The resistances of the first resistor R1 and the second resistor R2 are shown separately.
From the above formula, the voltage at the voltage output terminal V0 of the front module is related to the voltage at the voltage feedback terminal FB and the voltage at the first resistor R1.
Through the design, the preceding stage conversion module, the first field effect transistor Q1, the second field effect transistor Q2 and the preceding stage control module form a closed loop, and the output voltage of the preceding stage conversion module can be adjusted in real time according to the voltage drop between the battery voltage and the voltage output end V0 as long as the battery is in a charging state, so that the charging chip can charge the batteries with different voltages, the requirements of the charging voltages of different batteries are met, particularly, different high charging voltages are required for a plurality of series-connected batteries, and the application range is greatly enlarged. In addition, because the output voltage of the preceding stage conversion module changes along with the change of the battery voltage, the output voltage can be ensured to be the most suitable charging voltage of the battery, and the maximum charging efficiency of the battery is ensured.
The CC/CV control module is used for detecting the charging voltage and the charging current of the battery in real time, as shown in fig. 1, the CC/CV control module has two input terminals, both of which are electrically connected to the battery, one is a voltage sampling terminal V1, and the other is a current sampling terminal N1, which can control the on/off of the first fet Q1 and the second fet Q2, and during the charging process, the first fet Q1 and the second fet Q2 are both in the on state, so as to achieve the function of collecting the battery voltage and the output voltage of the pre-stage conversion module in real time.
In this embodiment, the CC/CV control module is a constant voltage/constant current control module, and is a current control technology applied to the battery charging chip all the time. In this embodiment, a constant voltage and constant current control chip, such as a constant voltage and constant current control chip model EG4313, is illustrated.
In this embodiment, the front module may be integrated into the charging chip, or may not be integrated into the charging chip.
Example two
As shown in fig. 1, this embodiment is a specific implementation manner of the charging chip supporting flexible input and output described in the first embodiment, that is, a circuit diagram of an internal circuit in the charging chip supporting flexible input and output is given.
The charging chip supporting flexible input and output provided by the embodiment comprises a preceding stage conversion module, a voltage output end V0 of the preceding stage conversion module is electrically connected with a battery to form a charging loop, and a first field effect transistor Q1 and a second field effect transistor Q2 are connected in series between the voltage output end V0 of the preceding stage conversion module and the battery.
The charging chip also comprises a CC/CV control module which collects the voltage and the current of the battery and respectively drives the first field-effect tube Q1 and the second field-effect tube Q2 through the driving circuit.
The charging chip further comprises a preceding stage control module which respectively collects the voltage of a voltage output end V0 of the preceding stage conversion module, the voltage of a battery and the voltage between the first field effect transistor Q1 and the second field effect transistor Q2.
The output end Adj of the preceding stage control module is electrically connected with the voltage feedback end FB of the preceding stage conversion module, one end of a first resistor R1 and one end of a second resistor R2 respectively, the other end of the first resistor R1 is electrically connected with the voltage output end V0 of the preceding stage conversion module, and the other end of the second resistor R2 is grounded.
The preceding stage control module enables the preceding stage conversion module to regulate the output voltage in real time according to the voltage on the voltage feedback end FB and the first resistor R1.
The circuit structures and the achieved technical effects of the CC/CV control module, the preceding stage control module, the first fet Q1, the second fet Q2, and the preceding stage conversion module in this embodiment are the same as those in the first embodiment, and thus are not repeated herein.
As shown in fig. 1, the following describes a specific circuit for the preceding stage control module:
preferably, the preceding stage control module comprises a voltage sampling processing circuit, a closed-loop control circuit and a controlled current source circuit which are electrically connected in sequence.
The voltage sampling processing circuit is used for respectively collecting the voltage of a voltage output end V0 of the preceding stage conversion module, the voltage of a battery and the voltage between the first field effect transistor Q1 and the second field effect transistor Q2.
The output end of the controlled current source circuit is used as the output end Adj of the preceding stage control module and is electrically connected with the voltage feedback end FB of the preceding stage conversion module, one end of the first resistor R1 and one end of the second resistor R2.
In this embodiment, the voltage sampling processing circuit collects the voltage at the voltage output terminal V0 of the preceding stage transformation module, the voltage between the first field-effect transistor Q1 and the second field-effect transistor Q2, and the battery voltage, and then, the collected voltage is further amplified and filtered, and the closed-loop control circuit converts the voltage collected by the voltage sampling processing circuit into a signal for controlling the controlled current source circuit; the controlled current source circuit is used for controlling the output of the preceding stage control module, so that the preceding stage conversion module adjusts the output voltage of the voltage output end V0 in real time according to the voltage at the voltage feedback end FB and the first resistor R1.
Preferably, the voltage sampling processing circuit comprises a first operational amplifier A1, a second operational amplifier A2, a third operational amplifier A3 and a fourth operational amplifier A4, wherein the fourth operational amplifier A4 is provided with three input ends.
The non-inverting input end of the first operational amplifier a1 is electrically connected to the drain of the first field effect transistor Q1, the non-inverting input end of the second operational amplifier a2 is electrically connected to the source of the first field effect transistor Q1 and the source of the second field effect transistor Q2, respectively, and the non-inverting input end of the third operational amplifier A3 is electrically connected to the drain of the second field effect transistor Q2.
The output end and the inverting input end of the first operational amplifier A1 are respectively and electrically connected with the first input end IN1 of the fourth operational amplifier A4, the output end and the inverting input end of the second operational amplifier A2 are respectively and electrically connected with the second input end IN2 of the fourth operational amplifier A4, the output end and the inverting input end of the third operational amplifier A3 are respectively and electrically connected with the third input end IN3 of the fourth operational amplifier A4, and the output end of the fourth operational amplifier A4 is electrically connected with the input end of the closed-loop control circuit.
As shown in fig. 1, the following describes the voltage sampling processing circuit in detail:
the voltage sampling processing circuit is composed of four amplifiers, in this embodiment, the amplifiers in the voltage sampling processing circuit are used as voltage followers, and have the characteristics of high input impedance and low output impedance, that is, the impedances of the first operational amplifier a1, the second operational amplifier a2 and the third operational amplifier A3 in the voltage sampling processing circuit are higher than the impedances of the first field-effect transistor Q1 and the second field-effect transistor Q2, so that when the voltage and current of the previous-stage converter are output, the battery can be charged only through the first field-effect transistor Q1 and the second field-effect transistor Q2, and the battery cannot enter the voltage sampling processing circuit.
As shown in fig. 1, the voltage sampling processing circuit adopts a first operational amplifier a1, a second operational amplifier a2 and a second operational amplifier A3 to respectively collect the voltage at the voltage output terminal V0 of the pre-stage conversion module, the voltage between the first field effect transistor Q1 and the second field effect transistor Q2 and the battery voltage.
The voltage sampling processing circuit can obtain the voltage drop between the voltage output end V0 of the pre-converter and the battery through the design, the voltage sampling processing circuit can perform amplification and filtering processing through an internal amplifier, and the voltage sampling processing circuit inputs the voltage into the closed-loop control circuit after the processing is finished.
Preferably, the closed-loop control circuit comprises a fifth operational amplifier A5, a third resistor R3, a first capacitor C1 and a second capacitor C2.
The non-inverting input end of the fifth operational amplifier A5 is used as the input end of the closed-loop control circuit and is electrically connected with the output end of the voltage sampling processing circuit.
The non-inverting input terminal of the fifth operational amplifier a5 is further electrically connected to one end of the first capacitor C1 and one end of the second capacitor C2, the other end of the first capacitor C1 is electrically connected to one end of the third resistor R3, and the other end of the third resistor R3 and the other end of the second capacitor C2 are electrically connected to the output terminal of the fifth operational amplifier a5, respectively.
The output end of the fifth operational amplifier A5 is used as the output end of the closed-loop control circuit and is electrically connected with the input end of the controlled current source circuit.
As shown in fig. 1, the closed-loop control circuit is used to convert the voltage signal output by the voltage sampling processing circuit into a signal that can control the output of the controlled current source circuit.
Preferably, the controlled current source circuit comprises a third capacitor C3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a triode P1.
One end of the third capacitor C3, one end of the fourth capacitor C4 and one end of the fourth resistor R4 are electrically connected to the output end of the closed-loop control circuit respectively, the other end of the fourth resistor R4 is electrically connected to the base of the triode P1, the collector of the triode P1 is electrically connected to one end of the fifth resistor R5, the other end of the fourth capacitor C4 is electrically connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is electrically connected to the other end of the fifth resistor R5, and serves as the output Adj of the preceding stage control module, and the voltage feedback end FB of the preceding stage conversion module is electrically connected.
The other end of the sixth resistor R6 is further electrically connected to the voltage output terminal V0 of the preceding stage conversion module, and the other end of the third capacitor C3 and the emitter of the transistor P1 are grounded.
As shown in fig. 1, the controlled current source circuit is based on the output of the closed-loop control circuit, so that the pre-stage conversion module can adjust its output voltage in real time according to the voltage of the input voltage feedback terminal FB and the voltage of the first resistor R1, thereby meeting the charging voltage requirements of different batteries and multiple series-connected batteries.
In summary, the preceding stage conversion module, the first field effect transistor Q1, the second field effect transistor Q2, the voltage sampling processing circuit, the closed-loop control circuit and the controlled current source circuit form a closed-loop system, and the voltage drop of the first field effect transistor Q1 and the voltage drop of the second field effect transistor Q2 are collected and input to the voltage feedback terminal FB of the preceding stage conversion module, so that the output voltage of the preceding stage conversion module is changed, and the real-time adjustment of the battery charging voltage is further realized.
In addition, the voltage output by the voltage output end V0 of the preceding stage conversion module can be adjusted in real time according to the output of the preceding stage control module, so that the charging chip does not need to depend on the topological structure of the preceding stage conversion module, the preceding stage conversion module structure can be flexibly selected according to the system requirement, the limitation of the charging chip on input is reduced, and the practical scene and the application range are greatly expanded.
The utility model discloses a charging chip is linear charging chip, possesses the advantage of the low noise that charges that traditional linear charging chip all possessed, can combine switching power supply circuit simultaneously, reduces the consumption on the charging chip when improving charge efficiency, makes the utility model discloses obtain more extensive application.
In this embodiment, the voltage drop across the first fet Q1 and the second fet Q2 (i.e., the voltage drop between the voltage output terminal V0 and the battery voltage) can be controlled within a stable range, generally from tens to hundreds of mv, by the closed-loop system formed as described above, and the value of this range depends on the heat dissipation of the charging chip and the maximum allowable charging current, so that the dynamic adjustment of the charging voltage of the battery can be realized, and the charging chip can meet the charging voltages of different batteries.
In this embodiment, a voltage stabilizing chip may be further disposed between the voltage output terminal V0 of the preceding stage transform module and the sixth resistor R6, so as to ensure that the current of the whole controlled current source circuit is constant.
In this embodiment, in order to ensure the output current accuracy of the controlled current source, electrical components such as an operational amplifier, a resistor, a capacitor, etc. may be added to the circuit to form a current loop closed-loop system of the current source, thereby improving the stability of the whole circuit.
Preferably, the driving circuit comprises a driving sub-circuit and an anti-backdriving sub-circuit.
The input end IN4 of the driving sub-circuit is electrically connected with the first output end of the CC/CV control module, and the output end IOU1 of the driving sub-circuit is electrically connected with the grid electrode of the second field effect transistor Q2.
The input end IN5 of the anti-reverse driving sub-circuit is electrically connected with the second output end of the CC/CV control module, and the output end IOU2 of the anti-reverse driving sub-circuit is electrically connected with the grid electrode of the first field effect transistor Q1.
As shown in fig. 1, the driving circuit is used to control the on/off of the first fet Q1 and the second fet Q2.
Namely, the drive sub-circuit is used for controlling the on-off of the second field effect transistor Q2, and the anti-reverse drive sub-circuit is used for controlling the on-off of the first field effect transistor Q1, and simultaneously, the aim of preventing the current of the battery from flowing backwards is achieved.
In the present embodiment, the driving sub-circuit and the anti-inversion driving sub-circuit are both existing circuits.
Preferably, the pre-stage conversion module is any one of a dc step-down circuit, a boost circuit, a step-up/step-down circuit or an ac-to-dc conversion circuit.
Through the design, different preceding stage conversion modules can be arranged, the voltage boosting, the voltage reducing, the voltage boosting and the voltage reducing, the alternating current to direct current and the like of the charging voltage are realized, and the requirements of the charging voltages of different batteries are met.
In this embodiment, the pre-stage conversion module is any one of the four circuits, and may be integrated in the charging chip, or may not be integrated in the charging chip.
Preferably, the first fet Q1 and the second fet Q2 are both N-type fets or P-type fets. Through the design, the types of the first field effect transistor Q1 and the second field effect transistor Q2 can be selected according to the actual circuit, and the electronic device most suitable for the circuit can be selected.
In this embodiment, the first fet Q1 and the second fet Q2 may be integrated into a charging chip, or may not be integrated into the charging chip.
The utility model discloses the different level combinations of pin of accessible charging chip and through its own feedback voltage preset rechargeable battery's festival number, please see embodiment two and embodiment three specifically.
EXAMPLE III
As shown in fig. 2, this embodiment is a pin diagram of the charging chip supporting flexible input and output in the first embodiment.
As shown in fig. 1, in the present embodiment, the pre-converter is not provided in the charging chip.
In this embodiment, the charging chip includes a Vch pin, which is used as a charging voltage input terminal of the charging chip for charging the battery, and a Vbt pin which is used as an output terminal of the charging voltage, and a current sampling resistor Rsen is provided on the Vch pin for sampling the charging current in real time, performing CC control and overcurrent protection, and it may be on the input or output side of the chip, or inside the chip.
The Adj pin is used as the output end of the preceding stage control module and is electrically connected with the voltage feedback end FB of the preceding stage conversion module, so that the preceding stage conversion module can regulate the output voltage according to the sampling voltage, namely, the voltage input into the charging chip.
The specific principle of the method is that the number of the battery sections needing to be charged can be selected by judging the combination of high and low levels on the SELi pin and the SELi pin.
Example four
As shown in fig. 3, this embodiment is another pin diagram of the charging chip supporting flexible input and output described in the first embodiment.
As shown in fig. 3:
in this embodiment, the number of the rechargeable battery segments is determined according to the set output voltage on the FB1 pin of the rechargeable chip, and the FB1 pin is used as the voltage feedback pin of the rechargeable chip, so as to determine the required charge cut-off voltage for the series connection of the rechargeable battery segments by setting the output voltage of the pin, thereby determining the number of the rechargeable battery segments in series connection.
To sum up, the utility model provides a support nimble input/output's charging chip has following technological effect:
(1) the utility model discloses a voltage sampling module gathers voltage output VO upper voltage and battery voltage's pressure drop, and feed back to preceding stage converter, and then make preceding stage converter can adjust its output voltage in real time, a closed loop system has been constituted from this, on the one hand, can satisfy the charging voltage's of different battery combinations demand, especially battery series connection needs high-pressure charging demand, on the other hand, this closed loop system does not rely on the topological structure of preceding stage conversion module, the preceding stage conversion module can step up for the direct current promptly, step-down and exchange and change arbitrary one in the direct current circuit, thereby can select preceding stage conversion modular structure to the charging chip according to the system requirements in a flexible way, the restriction to the input of this charging chip has been reduced, practical scene and range of application have greatly been expanded.
(2) Because the output voltage of the battery voltage acquired by the preceding stage control module can be adjusted in real time by the preceding stage conversion module, the output voltage can be dynamically adjusted along with the change of the battery voltage, the battery is charged by the most appropriate voltage, and the charging efficiency of the battery is further ensured.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (8)
1. A charging chip supporting flexible input and output is characterized in that: the device comprises a preceding-stage conversion module, wherein a voltage output end (V0) of the preceding-stage conversion module is electrically connected with a battery to form a charging loop, and a first field effect tube (Q1) and a second field effect tube (Q2) are connected in series between the voltage output end (V0) of the preceding-stage conversion module and the battery;
the charging chip also comprises a CC/CV control module which collects the voltage and the current of the battery and respectively drives the first field-effect tube (Q1) and the second field-effect tube (Q2) through a driving circuit;
the charging chip further comprises a preceding stage control module which respectively collects the voltage of a voltage output end (V0) of the preceding stage conversion module, the voltage of a battery and the voltage between the first field effect transistor (Q1) and the second field effect transistor (Q2);
the output end (Adj) of the preceding stage control module is respectively electrically connected with the voltage feedback end (FB) of the preceding stage conversion module, one end of a first resistor (R1) and one end of a second resistor (R2), the other end of the first resistor (R1) is electrically connected with the voltage output end (V0) of the preceding stage conversion module, and the other end of the second resistor (R2) is grounded;
the preceding stage control module enables the preceding stage conversion module to regulate the output voltage in real time according to the voltage on the voltage feedback end (FB) and the first resistor (R1).
2. The charging chip supporting flexible input and output according to claim 1, wherein: the preceding stage control module comprises a voltage sampling processing circuit, a closed-loop control circuit and a controlled current source circuit which are electrically connected in sequence;
the voltage sampling processing circuit is used for respectively collecting the voltage of a voltage output end (V0) of the preceding stage conversion module, the voltage of a battery and the voltage between the first field effect transistor (Q1) and the second field effect transistor (Q2);
the output end of the controlled current source circuit is used as the output end (Adj) of the preceding stage control module and is electrically connected with the voltage feedback end (FB) of the preceding stage conversion module, one end of a first resistor (R1) and one end of a second resistor (R2).
3. The charging chip supporting flexible input and output according to claim 2, wherein: the voltage sampling processing circuit comprises a first operational amplifier (A1), a second operational amplifier (A2), a third operational amplifier (A3) and a fourth operational amplifier (A4), wherein the fourth operational amplifier (A4) is provided with three input ends;
the non-inverting input end of the first operational amplifier (A1) is electrically connected with the drain electrode of the first field-effect tube (Q1), the non-inverting input end of the second operational amplifier (A2) is respectively and electrically connected with the source electrode of the first field-effect tube (Q1) and the source electrode of the second field-effect tube (Q2), and the non-inverting input end of the third operational amplifier (A3) is electrically connected with the drain electrode of the second field-effect tube (Q2);
the output end and the inverting input end of the first operational amplifier (A1) are respectively and electrically connected with the first input end (IN1) of the fourth operational amplifier (A4), the output end and the inverting input end of the second operational amplifier (A2) are respectively and electrically connected with the second input end (IN2) of the fourth operational amplifier (A4), the output end and the inverting input end of the third operational amplifier (A3) are respectively and electrically connected with the third input end (IN3) of the fourth operational amplifier (A4), and the output end of the fourth operational amplifier (A4) is electrically connected with the input end of the closed-loop control circuit.
4. The charging chip supporting flexible input and output according to claim 2, wherein: the closed loop control circuit comprises a fifth operational amplifier (A5), a third resistor (R3), a first capacitor (C1) and a second capacitor (C2);
the non-inverting input end of the fifth operational amplifier (A5) is used as the input end of the closed-loop control circuit and is electrically connected with the output end of the voltage sampling processing circuit;
the non-inverting input end of the fifth operational amplifier (A5) is also electrically connected with one end of the first capacitor (C1) and one end of the second capacitor (C2), the other end of the first capacitor (C1) is electrically connected with one end of the third resistor (R3), and the other end of the third resistor (R3) and the other end of the second capacitor (C2) are respectively electrically connected with the output end of the fifth operational amplifier (A5);
the output end of the fifth operational amplifier (A5) is used as the output end of the closed loop control circuit and is electrically connected with the input end of the controlled current source circuit.
5. The charging chip supporting flexible input and output according to claim 2, wherein: the controlled current source circuit comprises a third capacitor (C3), a fourth capacitor (C4), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6) and a triode (P1);
one end of the third capacitor (C3), one end of the fourth capacitor (C4) and one end of the fourth resistor (R4) are electrically connected to an output end of the closed-loop control circuit, respectively, the other end of the fourth resistor (R4) is electrically connected to a base of the triode (P1), a collector of the triode (P1) is electrically connected to one end of the fifth resistor (R5), the other end of the fourth capacitor (C4) is electrically connected to one end of the sixth resistor (R6), the other end of the sixth resistor (R6) is electrically connected to the other end of the fifth resistor (R5) and serves as an output end (Adj) of the preceding stage control module to be electrically connected to a voltage feedback end (FB) of the preceding stage conversion module;
the other end of the sixth resistor (R6) is also electrically connected with a voltage output end (V0) of the preceding stage conversion module, and the other end of the third capacitor (C3) is grounded with an emitter of the triode (P1).
6. The charging chip supporting flexible input and output according to claim 1, wherein: the driving circuit comprises a driving sub-circuit and an anti-reverse driving sub-circuit;
the input end (IN4) of the driving sub-circuit is electrically connected with the first output end of the CC/CV control module, and the output end (IOU1) of the driving sub-circuit is electrically connected with the grid electrode of the second field effect transistor (Q2);
the input end (IN5) of the anti-reverse driving sub-circuit is electrically connected with the second output end of the CC/CV control module, and the output end (IOU2) of the anti-reverse driving sub-circuit is electrically connected with the grid electrode of the first field effect transistor (Q1).
7. The charging chip supporting flexible input and output according to claim 1, wherein: the pre-stage conversion module is any one of a direct current voltage reduction circuit, a voltage boosting circuit or an alternating current-to-direct current circuit.
8. The charging chip supporting flexible input and output according to claim 1, wherein: the first field effect transistor (Q1) and the second field effect transistor (Q2) are both N-type field effect transistors or P-type field effect transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921647259.XU CN210380337U (en) | 2019-09-29 | 2019-09-29 | Charging chip supporting flexible input and output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921647259.XU CN210380337U (en) | 2019-09-29 | 2019-09-29 | Charging chip supporting flexible input and output |
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| CN210380337U true CN210380337U (en) | 2020-04-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111799497A (en) * | 2020-06-30 | 2020-10-20 | 欣旺达电子股份有限公司 | Battery formation system and battery formation method |
| CN113809790A (en) * | 2021-08-05 | 2021-12-17 | 惠州市蓝微电子有限公司 | Multi-battery pack charging method, charging monitoring method and device |
| CN116317018A (en) * | 2023-03-30 | 2023-06-23 | 深圳市欧姆微电子有限公司 | Multi-power supply port control circuit, electronic equipment and control method for main voltage conversion |
-
2019
- 2019-09-29 CN CN201921647259.XU patent/CN210380337U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111799497A (en) * | 2020-06-30 | 2020-10-20 | 欣旺达电子股份有限公司 | Battery formation system and battery formation method |
| CN111799497B (en) * | 2020-06-30 | 2022-04-15 | 欣旺达电子股份有限公司 | Battery formation system and battery formation method |
| CN113809790A (en) * | 2021-08-05 | 2021-12-17 | 惠州市蓝微电子有限公司 | Multi-battery pack charging method, charging monitoring method and device |
| CN116317018A (en) * | 2023-03-30 | 2023-06-23 | 深圳市欧姆微电子有限公司 | Multi-power supply port control circuit, electronic equipment and control method for main voltage conversion |
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