CN111146515A - Chip cascade circuit based on diode realization - Google Patents
Chip cascade circuit based on diode realization Download PDFInfo
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- CN111146515A CN111146515A CN201911338629.6A CN201911338629A CN111146515A CN 111146515 A CN111146515 A CN 111146515A CN 201911338629 A CN201911338629 A CN 201911338629A CN 111146515 A CN111146515 A CN 111146515A
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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
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- 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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a chip cascade circuit realized based on a diode, which is arranged in a lithium battery protection chip and comprises a voltage control circuit, an analog device module and a phase inverter module, wherein the voltage control circuit is connected with the analog device module; at the beginning of the design of the lithium battery protection chip, a cascade function module (chip cascade circuit) is added, so that the availability of the lithium battery protection chip is enhanced while the utilization rate of the lithium battery protection chip is improved.
Description
Technical Field
The invention relates to the field of battery management technology and the like, in particular to a chip cascade circuit realized based on a diode.
Background
Nowadays, with the rise of new energy, the application of lithium batteries is increasingly widespread. For the safety of lithium battery use, lithium battery protection chips are produced. The current lithium battery protection chips can be divided into single lithium battery protection chips and multiple lithium battery protection chips according to the number of protected battery packs. As the number of battery cells constituting a battery pack increases, the number of battery cells that can be protected by a chip becomes a focus of attention. The cascade function of the lithium battery protection chip can well solve the problem to a certain extent.
Disclosure of Invention
The invention aims to design a chip cascade circuit realized based on a diode, and a cascade function module (a chip cascade circuit) is added at the beginning of the design of a lithium battery protection chip, so that the availability of the lithium battery protection chip can be enhanced while the utilization rate of the lithium battery protection chip is improved.
The invention is realized by the following technical scheme: a chip cascade circuit realized based on a diode is arranged in a lithium battery protection chip and comprises a voltage control circuit, an analog device module and a phase inverter module, wherein the voltage control circuit is connected with the analog device module, the analog device module is connected with the phase inverter module, external ports of the lithium battery protection chip are formed on the voltage control circuit and the analog device module, an internal port of the lithium battery protection chip is formed on the phase inverter module, and the internal port of the lithium battery protection chip is connected with a logic control module in the lithium battery protection chip; when the chip cascade circuit is cascaded, the logic control module is connected with the control port CDC and the control port DDC of the lithium battery protection chip, and in specific application, two chip cascade circuits are arranged in one lithium battery protection chip, wherein one chip cascade circuit is used for charging monitoring, and the other chip cascade circuit is used for discharging monitoring.
In order to further realize the invention, the following arrangement mode is adopted: the voltage control circuit comprises a diode D101, a diode D100 and a resistor R103, wherein the first end of the diode D101 is connected with the analog device module, the second end of the diode D101 is connected with the first end of the diode D100 through the resistor R103, the second end of the diode D100 forms a CC/DC external port of the lithium battery protection chip, the second end of the diode D100 is connected with the analog device module, the second end of the diode D101 forms a Vcc external port of the lithium battery protection chip, and the resistor R103 plays a role in protecting an internal circuit of the lithium battery protection chip and prevents the device from being damaged due to overhigh working voltage.
In order to further realize the invention, the following arrangement mode is adopted: the second end of the diode D100 is further connected with a resistor R102, the other end of the resistor R102 is a CC/DC external port of the lithium battery protection chip, and the resistor R102 plays a role in protecting an internal circuit of the lithium battery protection chip, so as to prevent the device from being damaged due to overhigh working voltage.
In order to further realize the invention, the following arrangement mode is adopted: the diode D101 is a zener diode, the diode D100 is a common diode, the cathode of the diode D101 and the cathode of the diode D100 are both connected to the resistor R103, and the diode D101 is a zener diode to handle the clamping voltage of the body.
In order to further realize the invention, the following arrangement mode is adopted: the analog device module comprises an MOS tube Q108, an MOS tube Q107, an MOS tube Q109 and an MOS tube Q110, wherein a resistor R105 is connected to the grid electrode of the MOS tube Q108 to form a Vdd external port of the lithium battery protection chip, the drain electrode of the MOS tube Q108 is connected with the first end of a diode D101, the drain electrode of the MOS tube Q108 is connected with the grid electrode of the MOS tube Q107 through a resistor R104, the drain electrode of the MOS tube Q107 is connected with the second end of a diode D100, the source electrode of the MOS tube Q107 is respectively connected with the grid electrode of the MOS tube Q110 and the drain electrode of the MOS tube Q109, a resistor R106 is connected to the grid electrode of the MOS tube Q109, the other end of the resistor R106 is connected with the Vdd external port of the lithium battery protection chip, the drain electrode of the MOS tube Q110 is connected with the inverter module, and the source electrode; the MOS transistor Q108, the MOS transistor Q107, the MOS transistor Q109, and the MOS transistor Q110 can be adjusted to be a common transistor or a voltage-withstanding transistor according to the magnitude of the port voltage, so as to adapt to working environments with different voltages.
In order to further realize the invention, the following arrangement mode is adopted: the source of the MOS transistor Q108 is also provided with a constant current source I1, the source of the MOS transistor Q109 is also provided with a constant current source I2, the drain of the MOS transistor Q110 is also provided with a constant current source I3, the constant current source I1, the constant current source I2 and the constant current source I3 are all provided by current sources in other structures inside the lithium battery protection chip, wherein the constant current source I1 and the constant current source I2 are pull-down current sources, and the constant current source I3 is a pull-up current source, so as to adapt to working requirements of different MOS transistors.
In order to further realize the invention, the following arrangement mode is adopted: the phase inverter module comprises a phase inverter A111 and a phase inverter A112, the analog device module is connected with the input end of the phase inverter A111 (namely the drain electrode of the MOS tube Q110 is connected with the input end of the phase inverter A111), the output end of the phase inverter A111 is connected with the input end of the phase inverter A112, the output end of the phase inverter A112 forms an internal port of the CC _ in/DC _ in lithium battery protection chip, the internal port of the CC _ in/DC _ in lithium battery protection chip is connected with the logic control module, the phase inverter A111 and the phase inverter A112 are connected in series, slowly-changing analog signals can be intuitively and rapidly turned into digital signals, and meanwhile, the driving capability of the internal port of the CC _ in/DC _; the internal port of the CC _ in/DC _ in lithium battery protection chip is connected with the logic control module, and the internal port of the CC _ in/DC _ in lithium battery protection chip is processed in the logic control module and then finally output to the control ports (namely a control port CDC and a control port DDC respectively) of the charging tube and the discharge tube, so that the charging tube and the discharge tube are controlled.
It should be noted that, in order to implement the cascade function of the lithium battery protection chip, it is necessary to monitor charging and discharging simultaneously, and two cascade circuits are arranged in one lithium battery protection chip and are respectively used for monitoring charging and discharging. In the cascade circuit of the charging monitoring, a CC/DC external port is actually used as a CC function port, and a CC _ in/DC _ in lithium battery protection chip internal port is actually used as a CC _ in function port. In the cascade circuit of the discharge monitoring, the CC/DC external port is actually used as a DC functional port, and the CC _ in/DC _ in lithium battery protection chip internal port is actually used as a DC _ in functional port. On the basis of the description, the CC _ in/DC _ in lithium battery protection chip internal port of the charging monitoring cascade circuit and the CC _ in/DC _ in lithium battery protection chip internal port of the discharging monitoring cascade circuit correspond to a CC _ in function port and a DC _ in function port respectively, the two ports are connected to the logic control module U202 through an in branch respectively, and are output through an out branch after operation is performed inside the logic control module U202. The in and out branches passed by the CC _ in function port at this time correspond to the control port CDC. The in and out branches through which the DC _ in function port passes correspond to the control port DDC.
When the two-stage lithium battery protection chips are cascaded, the cascade control is realized through a chip cascade circuit, output signals of a control port CDC and a control port DDC of an upper lithium battery protection chip are transmitted to a CC/DC external port of a lower lithium battery protection chip (the control port CDC corresponds to a CC/DC external port (CC function port) of a cascade circuit for charging monitoring, and the control port DDC corresponds to a CC/DC external port (DC function port) of a cascade circuit for discharging monitoring), and is output to a logic control module of a lower-level lithium battery protection chip through a CC _ in/DC _ in port, and is finally transmitted to a control port CDC and a control port DDC of the lower-level lithium battery protection chip through internal processing of the logic control module, the in and out branches through which the output of the internal port of the CC _ in/DC _ in lithium battery protection chip for the CC _ in functional port of the charging monitoring cascade circuit passes correspond to the control port CDC; and the in and out branches through which the output of the internal port of the CC _ in/DC _ in lithium battery protection chip for the DC _ in functional port passes by the cascade circuit for discharge monitoring correspond to the control port DDC, so that the control of the charging tube and the discharge tube of the two-stage chip is realized. When the number of the lithium battery protection chips increases, the situation is also applicable. Under the condition that multistage lithium battery protection chip work, the control port CDC and the control port DDC of subordinate lithium battery protection chip are connected to the charge tube and discharge the pipe, and the control port CDC and the control port DDC of superior lithium battery protection chip are connected to the CC function port (the cascade circuit that charges and monitor) and the DC function port (the cascade circuit that discharges and monitor) of subordinate lithium battery protection chip respectively, finally realize the cascade function of multisection lithium battery protection chip.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) in the invention, the cascade function module (chip cascade circuit) is added at the beginning of the design of the lithium battery protection chip, so that the availability of the lithium battery protection chip is enhanced while the utilization rate of the lithium battery protection chip is improved.
(2) The invention can realize the safe and stable cascade among a plurality of lithium battery protection chips, and can effectively protect the lithium batteries after the cascade.
The cascade circuit can be applied to the cascade of the lithium battery protection chips, can well solve the limitation of the lithium battery protection chips in the application process, enables the application range of the lithium battery protection chips to be wider, and simultaneously enables the lithium battery protection chips with the cascade circuit to be more economical in the application process.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a schematic diagram of the operation of the internal module of the lithium battery protection chip designed based on the present invention (only one cascade circuit is shown in the chip).
Fig. 3 is a schematic diagram of the operation of the multi-stage lithium battery protection chip in the cascade state.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments 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 "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1:
the invention provides a chip cascade circuit realized based on a diode, wherein a cascade function module (chip cascade circuit) is added at the beginning of the design of a lithium battery protection chip, so that the usability of the lithium battery protection chip can be enhanced while the utilization rate of the lithium battery protection chip is improved, and as shown in figure 1, the following setting mode is particularly adopted: the lithium battery protection chip comprises a voltage control circuit, an analog device module and a phase inverter module, wherein the voltage control circuit is connected with the analog device module, the analog device module is connected with the phase inverter module, external ports of the lithium battery protection chip are formed on the voltage control circuit and the analog device module, an internal port of the lithium battery protection chip is formed on the phase inverter module, and the internal port of the lithium battery protection chip is connected with a logic control module inside the lithium battery protection chip; when the chip cascade circuit is cascaded, the logic control module is connected with the control port CDC and the control port DDC of the lithium battery protection chip, and in specific application, two chip cascade circuits are arranged in one lithium battery protection chip, wherein one chip cascade circuit is used for charging monitoring, and the other chip cascade circuit is used for discharging monitoring.
Example 2:
the present embodiment is further optimized based on the above embodiment, and the same parts as the foregoing embodiment will not be described herein again, as shown in fig. 1, in order to further implement the present invention, the following setting manner is particularly adopted: the voltage control circuit comprises a diode D101, a diode D100 and a resistor R103, wherein the first end of the diode D101 is connected with the analog device module, the second end of the diode D101 is connected with the first end of the diode D100 through the resistor R103, the second end of the diode D100 forms a CC/DC external port of the lithium battery protection chip, the second end of the diode D100 is connected with the analog device module, the second end of the diode D101 forms a Vcc external port of the lithium battery protection chip, and the resistor R103 plays a role in protecting an internal circuit of the lithium battery protection chip and prevents the device from being damaged due to overhigh working voltage.
Example 3:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing embodiments will not be described herein again, as shown in fig. 1, in order to further implement the present invention better, the following setting manner is particularly adopted: the second end of the diode D100 is further connected with a resistor R102, the other end of the resistor R102 is a CC/DC external port of the lithium battery protection chip, and the resistor R102 plays a role in protecting an internal circuit of the lithium battery protection chip, so as to prevent the device from being damaged due to overhigh working voltage.
Example 4:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing embodiments will not be described herein again, as shown in fig. 1, in order to further implement the present invention better, the following setting manner is particularly adopted: the diode D101 is a zener diode, the diode D100 is a common diode, the cathode of the diode D101 and the cathode of the diode D100 are both connected to the resistor R103, and the diode D101 is a zener diode to handle the clamping voltage of the body.
Example 5:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing embodiments will not be described herein again, as shown in fig. 1, in order to further implement the present invention better, the following setting manner is particularly adopted: the analog device module comprises an MOS tube Q108, an MOS tube Q107, an MOS tube Q109 and an MOS tube Q110, wherein a resistor R105 is connected to the grid electrode of the MOS tube Q108 to form a Vdd external port of the lithium battery protection chip, the drain electrode of the MOS tube Q108 is connected with the first end of a diode D101, the drain electrode of the MOS tube Q108 is connected with the grid electrode of the MOS tube Q107 through a resistor R104, the drain electrode of the MOS tube Q107 is connected with the second end of a diode D100, the source electrode of the MOS tube Q107 is respectively connected with the grid electrode of the MOS tube Q110 and the drain electrode of the MOS tube Q109, a resistor R106 is connected to the grid electrode of the MOS tube Q109, the other end of the resistor R106 is connected with the Vdd external port of the lithium battery protection chip, the drain electrode of the MOS tube Q110 is connected with the inverter module, and the source electrode; the MOS transistor Q108, the MOS transistor Q107, the MOS transistor Q109, and the MOS transistor Q110 can be adjusted to be a common transistor or a voltage-withstanding transistor according to the magnitude of the port voltage, so as to adapt to working environments with different voltages.
Example 6:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing embodiments will not be described herein again, as shown in fig. 1, in order to further implement the present invention better, the following setting manner is particularly adopted: the source of the MOS transistor Q108 is also provided with a constant current source I1, the source of the MOS transistor Q109 is also provided with a constant current source I2, the drain of the MOS transistor Q110 is also provided with a constant current source I3, the constant current source I1, the constant current source I2 and the constant current source I3 are all provided by current sources in other structures inside the lithium battery protection chip, wherein the constant current source I1 and the constant current source I2 are pull-down current sources, and the constant current source I3 is a pull-up current source, so as to adapt to working requirements of different MOS transistors.
Example 7:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing embodiments will not be described herein again, as shown in fig. 1, in order to further implement the present invention better, the following setting manner is particularly adopted: the phase inverter module comprises a phase inverter A111 and a phase inverter A112, the analog device module is connected with the input end of the phase inverter A111 (namely the drain electrode of the MOS tube Q110 is connected with the input end of the phase inverter A111), the output end of the phase inverter A111 is connected with the input end of the phase inverter A112, the output end of the phase inverter A112 forms an internal port of the CC _ in/DC _ in lithium battery protection chip, the internal port of the CC _ in/DC _ in lithium battery protection chip is connected with the logic control module, the phase inverter A111 and the phase inverter A112 are connected in series, slowly-changing analog signals can be intuitively and rapidly turned into digital signals, and meanwhile, the driving capability of the internal port of the CC _ in/DC _; the internal port of the CC _ in/DC _ in lithium battery protection chip is connected with the logic control module, and the internal port of the CC _ in/DC _ in lithium battery protection chip is processed in the logic control module and then finally output to the control ports (namely a control port CDC and a control port DDC respectively) of the charging tube and the discharge tube, so that the charging tube and the discharge tube are controlled.
Example 8:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing embodiments will not be repeated herein, as shown in fig. 1, a chip cascade circuit implemented based on a diode is disposed inside a lithium battery protection chip, and includes a diode D100, a diode D101, a resistor R102, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a MOS transistor Q107, a MOS transistor Q108, a MOS transistor Q109, a MOS transistor Q110, an inverter a111, and an inverter a112, and in addition, the circuit further includes a constant current source I1, a constant current source I2, and a constant current source I3.
The CC/DC external port of the lithium battery protection chip is connected to one end of a resistor R102, the other end of the resistor R102 is connected to the S end of a MOS tube Q107 and the anode of a diode D100, and the cathode of the diode D100 is connected to Vcc and the cathode of a diode D101 through a resistor R103; the anode of the diode D101 is connected with the D tube of the MOS tube Q108, and is connected with the G end of the MOS tube Q107 through the resistor R104; the D end of the MOS transistor Q107 is connected with the G end of the MOS transistor Q110, the D end of the MOS transistor Q110 is connected with the input end of the phase inverter A111, the output end of the phase inverter A111 is connected with the input end of the phase inverter A112, and the phase inverter A112 outputs to a CC _ in/DC _ in port of the lithium battery protection chip. The G ends of the MOS tube Q108 and the MOS tube Q109 are connected with a Vdd port of the lithium battery protection chip, the S end of the MOS tube Q108, the S end of the MOS tube Q109 and the D end of the MOS tube Q110 are respectively connected with the constant current source I1, the constant current source I2 and the constant current source I3, and the S end of the MOS tube Q110 is grounded.
The chip cascade circuit is explained in detail below with reference to fig. 1. It should be noted that the explanation of fig. 1 can be explained in the context of the present application, and in this case, it is assumed that the values of the resistors R102, R103, R104, R105, and R106 of the embodiment are 1 kohm, the values of the constant current source I1 and the constant current source I3 are 0.5 μ a, and the value of the constant current source I2 is 1 μ a. In this embodiment, for example, 7 lithium battery protection chips are connected in series, so that the voltage value of Vcc is about 30V and the value of Vdd is about 5V. According to the knowledge of the diode in the industry, the voltage drop capability of the ordinary diode (diode D100) is about 0.5V, and the voltage drop capability of the zener diode (diode D101) is about 5V, and in the embodiment, the above values are typical values, but in the specific implementation, each parameter can be modified adaptively.
In the case of cascade connection of multiple lithium battery protection chips, a charge monitoring (protection) cascade circuit is taken as an example, and at this time, the input port CC (CC/DC external port of the charge monitoring cascade circuit is used as a CC function port). When the control port CDC of the upper lithium battery protection chip is high, the charging function of the upper lithium battery protection chip is in a normal working state, the input signal of the input port CC is high, and the voltage value of the input port CC is higher than that of Vcc. At this time, the voltage at the anode of the diode D100 is clamped to about 30.5V, and the voltage at the D terminal of the MOS transistor Q107 does not fluctuate much due to the characteristic of the clamped voltage of the diode D100. Meanwhile, the diode D101 functions as a zener diode, so that the voltage value of the anode of the diode D101 is clamped to about 5V below Vcc, i.e., the voltage value of the anode of the diode D101 is about 25V. At this time, the MOS transistor Q107 is in a conducting operating state, and since the MOS transistor Q109 is in a conducting state due to the constant current source I2, the voltage at the G terminal of the MOS transistor Q110 is pulled high, the MOS transistor Q110 is conducted, and the voltage at the D terminal of the MOS transistor Q110 is pulled low. At this time, the inverter modules (the inverter a111 and the inverter a 112) connected in series can output the analog voltage, which changes slowly at this point, to the CC _ in function port in the form of digital voltage (the CC _ in/DC _ in lithium battery protection chip internal port of the cascade circuit for charge monitoring is used as the CC _ in function port), and the output voltage is low and is output to the logic control module U202. Similarly, when the control port DDC of the upper lithium battery protection chip is high, the discharging function of the upper lithium battery protection chip is in a normal operating state, at this time, the input signal of the input port DC (the CC/DC external port of the cascade circuit for discharge monitoring is used as the DC function port) is high, and the output voltage of the DC _ in function port (the CC _ in/DC _ in lithium battery protection chip internal port of the cascade circuit for discharge monitoring is used as the DC _ in function port) is low.
When the control port CDC of the upper lithium battery protection chip is low, the charging function of the upper lithium battery protection chip is in a protection state, and at this time, the input signal of the input port CC (the CC/DC external port of the charging monitoring cascade circuit is used as the CC function port) is low, that is, the voltage value of the input port CC (the CC/DC external port of the charging monitoring cascade circuit is used as the CC function port) is smaller than the voltage value of the Vcc port. Due to the diode characteristic, the voltage at the anode of the diode D100 is clamped at about 29.5V, and the voltage at the D terminal of the MOS transistor Q107 does not fluctuate much. It is worth noting that a resistor with a resistance value of 4M ohms can be connected in series between the control port CDC and the control port DDC of the upper lithium battery protection chip and the CC/DC external port of the lower lithium battery protection chip. Meanwhile, the diode D101 functions as a zener diode, so that the voltage value of the anode of the diode D101 is clamped to about 5V below Vcc, i.e., the voltage value of the anode of the diode D101 is about 25V. At this time, although the MOS transistor Q107 is in the on state, since the external resistance value is too high, the current value of the upper branch constituted by the resistor R102 and the MOS transistor Q107 at this time is smaller than the current value of the constant current source I2, that is, smaller than 1 μ a in the present embodiment. Therefore, at this time, the voltage at the G terminal of the MOS transistor Q110 is pulled low because the MOS transistor Q109 is turned on, the MOS transistor Q110 is turned off, and the voltage at the D terminal of the MOS transistor Q110 is pulled high. At this time, the inverter modules (inverter a111 and inverter a 112) connected in series can rapidly output the analog voltage which slowly changes at this point to the CC _ in function port in the form of digital voltage (the CC _ in/DC _ in lithium battery protection chip internal port of the cascade circuit for charge monitoring is used as the CC _ in function port), and at this time, the output voltage is high and is output to the logic control module. Similarly, when the input port DC (the CC/DC external port of the cascade circuit for discharge monitoring is used as the DC functional port) is low, the discharge function of the upper chip is in a protection state, and the output of the DC _ in functional port (the CC _ in/DC _ in lithium battery protection chip internal port of the cascade circuit for discharge monitoring is used as the DC _ in functional port) is also high.
Example 9:
as shown in fig. 2, based on fig. 1, the connection relationship between the modules related to the cascade function inside the chip includes a battery pack V200, a chip cascade circuit U201 and a logic control module U202. Under the operating conditions set by the present application in fig. 1, the battery pack V200 is composed of 7 batteries. When protection occurs, the control port CDC and the control port DDC of the upper lithium battery protection chip transmit a low level signal to the CC/DC external port of the chip cascade circuit U201 of the lower circuit, and as shown in fig. 1, the output port (CC _ in/DC _ in lithium battery protection chip internal port) of the chip cascade circuit U201 is compared with the input port (CC/DC external port), and the signal value is inverted, that is, the voltage value of the CC _ in/DC _ in lithium battery protection chip internal port is low when the voltage value of the CC/DC external port is high, and the voltage value of the CC _ in/DC _ in lithium battery protection chip internal port is high when the voltage value of the CC/DC external port is low. Then, the internal port of the CC _ in/DC _ in lithium battery protection chip is connected to the in port of the logic control module U202 of the lithium battery protection chip, however, the logic control module U202 integrates output values of different chip functions inside the lithium battery protection chip, and performs operation inside the logic control module and outputs the output values from the out port of the logic control module, that is, the control port CDC and the control port DDC of the chip of this stage. When the voltage of the control port CDC and the control port DDC of the superior lithium battery protection chip is high, the voltage of the control port CDC and the control port DDC of the subordinate lithium battery protection chip is also high. When the voltage of the control port CDC and the control port DDC of the superior lithium battery protection chip is low, the voltage of the control port CDC and the control port DDC of the subordinate lithium battery protection chip is also low. According to the transmission of the logical relationship described in fig. 2, the cascade function between the lithium battery protection chips can be realized.
Example 10:
fig. 3 is a schematic diagram of a multi-stage (specifically, 3-stage in this example) lithium battery protection chip operating in a cascade state. The charge + and the charge-are connected with the positive electrode and the negative electrode of the lithium battery pack, the lithium battery pack V300, the lithium battery pack V301, and the lithium battery pack V302 are all battery packs formed by connecting 7 batteries in series in the embodiment, the lithium battery protection chip IC303, the lithium battery protection chip IC304, and the lithium battery protection chip IC305 are three-level cascaded lithium battery protection chips, respectively, wherein the lithium battery protection chip IC305 is the lowest lithium battery protection chip. The resistors R308, R309, R310, and R311 are resistors between the control port CDC and the control port DDC of the upper lithium battery protection chip and the CC/DC external port connection of the lower lithium battery protection chip mentioned in the embodiment of fig. 1, and the resistance value of the resistors in this embodiment is 4M ohms. The resistors R312 and R313 are protection resistors of the top-level lithium battery protection chip CC and the terminal of the lithium battery protection chip Vcc with the resistance value of 1k ohm.
When any one level of lithium battery protection chip is protected, signals are transmitted in the states described in the figure 1 and the figure 2, and are finally transmitted to the charge and discharge tube of the lowest level of lithium battery protection chip, and the opening and closing of the loop are controlled, so that the working safety of the battery pack is ensured, and the cascade function of the lithium battery protection chips is realized.
This is illustrated in detail below with respect to the schematic diagram of fig. 3. When the charging driving control port CDC of the uppermost lithium battery protection chip IC303 is low, the lithium battery protection chip is in a protection state at this time, the control port CDC outputs a low voltage signal, and is connected to the charging control port CC of the lower lithium battery protection chip IC304 through the resistor R308, when the charging control port CC is low, the CC _ in function port inside the lithium battery protection chip (IC 304) is high voltage and outputs to the logic control module inside the lithium battery protection chip, the CC _ in function port is transmitted as a low voltage signal at the control port CDC of the lithium battery protection chip IC304 through the module, and so on, when reaching the lowermost lithium battery protection chip IC305, the charging driving control port CDC of the lithium battery protection chip IC305 is also low, so that the charging tube is closed, the charging protection occurs, and the entire cascade chip is in a normal protection state.
It should be noted that the charging control port CC and the discharging control port DC of the top lithium battery protection chip IC303 are respectively connected to the Vcc port through resistors R312 and R313. At this time, it can be ascertained that the cascade port of the lithium battery protection chip (IC 303) is always in a normal operating state, that is, the normal state of the external port of the cascade CC/DC is unchanged, and only when other protection functions inside the stage of chip IC303 are triggered, the charging drive control port CDC and the discharging drive control port DDC of the chip (IC 303) will transmit a protection signal to the lower stage of lithium battery protection chip.
It should be noted that the diode of the present invention can be replaced by an MOS transistor under specific conditions, wherein the MOS transistor is connected by a diode to achieve a function similar to that of the diode.
When carrying out the cascade of two-stage lithium cell protection chip, realize through the chip cascade circuit, the output signal transmission of control port CDC of higher level lithium cell protection chip and control port DDC end is to the CC/DC external port of subordinate lithium cell protection chip, and export the logic control module of subordinate lithium cell protection chip by CC _ in/DC _ in lithium cell protection chip internal port, finally transmit control port CDC and the control port DDC of this level lithium cell protection chip through logic control module internal processing, the realization is to the charge pipe of above two-stage chip and the control of discharge tube. When the number of the lithium battery protection chips increases, the situation is also applicable. Under the condition of multistage lithium battery protection chip work, the control port CDC and the control port DDC of subordinate lithium battery protection chip are connected to the charging tube and discharge the pipe, and the control port CDC and the control port DDC of superior lithium battery protection chip are connected to the CC function port and the DC function port of subordinate lithium battery protection chip respectively, finally realize the function of cascading of multisection lithium battery protection chip.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. The utility model provides a chip cascade circuit based on diode realizes, sets up in lithium cell protection chip which characterized in that: including voltage control circuit, analog device module and phase inverter module, voltage control circuit connects the analog device module, and the analog device module is connected the phase inverter module, all be formed with the outside port of lithium battery protection chip in voltage control circuit and the analog device module, be formed with the inside port of lithium battery protection chip in the phase inverter module.
2. The diode-based chip cascade circuit of claim 1, wherein: the voltage control circuit comprises a diode D101, a diode D100 and a resistor R103, wherein the first end of the diode D101 is connected with the analog device module, the second end of the diode D101 is connected with the first end of the diode D100 through the resistor R103, the second end of the diode D100 forms a CC/DC external port of the lithium battery protection chip, the second end of the diode D100 is connected with the analog device module, and the second end of the diode D101 forms a Vcc external port of the lithium battery protection chip.
3. The diode-based chip cascade circuit of claim 2, wherein: the second end of the diode D100 is further connected to a resistor R102, and the other end of the resistor R102 is a CC/DC external port of the lithium battery protection chip.
4. The diode-based chip cascade circuit of claim 2, wherein: the diode D101 is a zener diode, the diode D100 is a common diode, and the cathode of the diode D101 and the cathode of the diode D100 are both connected to the resistor R103.
5. A diode-based chip cascade circuit according to claim 2, 3 or 4, wherein: the analog device module comprises an MOS tube Q108, an MOS tube Q107, an MOS tube Q109 and an MOS tube Q110, a resistor R105 is connected to the grid of the MOS tube Q108 to form a Vdd external port of the lithium battery protection chip, the drain of the MOS tube Q108 is connected with the first end of a diode D101, the drain of the MOS tube Q108 is connected with the grid of the MOS tube Q107 through a resistor R104, the drain of the MOS tube Q107 is connected with the second end of the diode D100, the source of the MOS tube Q107 is respectively connected with the grid of the MOS tube Q110 and the drain of the MOS tube Q109, the grid of the MOS tube Q109 is connected with a resistor R106, the other end of the resistor R106 is connected with the Vdd external port of the lithium battery protection chip, the drain of the MOS tube Q110 is connected with the inverter module, and the source of the MOS tube Q110 forms a GND external port.
6. The diode-based chip cascade circuit of claim 5, wherein: a constant current source I1 is also provided on the source of the MOS transistor Q108, a constant current source I2 is also provided on the source of the MOS transistor Q109, and a constant current source I3 is also provided on the drain of the MOS transistor Q110.
7. A diode-based chip cascade circuit according to claim 1, 2, 3, 4 or 6, wherein: the phase inverter module comprises a phase inverter A111 and a phase inverter A112, the analog device module is connected with the input end of the phase inverter A111, the output end of the phase inverter A111 is connected with the input end of the phase inverter A112, and the output end of the phase inverter A112 forms an internal port of the CC _ in/DC _ in lithium battery protection chip.
8. A diode-based chip cascade circuit according to claim 1, 2, 3, 4 or 6, wherein: and the internal port of the lithium battery protection chip is connected with a logic control module in the lithium battery protection chip.
9. The diode-based chip cascade circuit of claim 8, wherein: and the chip cascade circuit is connected with the control port CDC and the control port DDC of the lithium battery protection chip by the logic control module when cascade connection is carried out.
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