CN219304470U - Voltage limiting protection chip of battery - Google Patents
Voltage limiting protection chip of battery Download PDFInfo
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- CN219304470U CN219304470U CN202223370608.2U CN202223370608U CN219304470U CN 219304470 U CN219304470 U CN 219304470U CN 202223370608 U CN202223370608 U CN 202223370608U CN 219304470 U CN219304470 U CN 219304470U
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Abstract
The utility model is suitable for the technical field of battery protection, and particularly relates to a voltage limiting protection chip of a battery. According to the utility model, voltage detection and signal processing are carried out through the voltage detection circuit and the signal processing circuit, whether the battery is in an overcharged state or an overdischarged state is determined, so that a corresponding voltage signal is obtained, the overcurrent detection circuit detects whether the battery is in a charged overcurrent state, a discharged overcurrent state or a load short circuit state, so that a corresponding overcurrent signal is obtained, the logic control circuit outputs a high-level signal or a low-level signal according to the voltage signal and the overcurrent signal, so that an actual power supply end of the voltage limiting control circuit is determined, and when the battery is in a normal working state, the actual power supply end is determined to be a second power supply end, so that the voltage limiting voltage output by the voltage output terminal is controlled to be smaller than the voltage of the voltage input end through the voltage limiting circuit, and the charge-discharge MOS switch outside the chip is driven to be conducted according to the voltage limiting voltage, so that the safety of the charge-discharge MOS switch is improved, and the loss of the charge-discharge MOS switch is reduced.
Description
Technical Field
The utility model relates to the technical field of battery protection, in particular to a voltage limiting protection chip of a battery.
Background
Due to the requirements of high-capacity charging and quick charging, the double-battery cell is widely applied to smart phones, tablet computers and other devices. Along with the gradual pulling of the sequence of USB PD3.1 application, the output power of the charger correspondingly increases, and the charging current increases, so new requirements are put forward for components such as the number of battery strings used by the equipment, battery protection chips and the like.
When the traditional battery protection chip works normally, the output voltage used for driving the on voltage of the charge control MOSFET and the on voltage of the discharge control MOSFET follows the total voltage change of the battery core, the total voltage of the double battery cores is generally higher than 5V and smaller than 10V, the output voltage is also generally higher than 5V and smaller than 10V, so that the voltage for driving the MOSFET can be higher, even exceeds the highest voltage between the gate electrode and the grid electrode of the MOSFET, namely the voltage withstand value of the MOSFET, the MOSFET is broken down, and the higher driving voltage means that the switching loss generated when the MOSFET is switched is larger, therefore, when the number of the battery core of the traditional battery protection chip is more, the safety of the MOSFET switch is lower, and meanwhile, the switching loss of the MOSFET is higher.
Therefore, in the field of battery protection technology, how to improve the safety of a MOSFET switch and reduce the loss of the MOSFET switch when multiple power cells are applied is a problem to be solved.
Disclosure of Invention
The embodiment of the utility model provides a voltage limiting protection chip of a battery, which aims to solve the problems of lower safety of a MOSFET switch and higher loss of the MOSFET switch caused by higher output voltage of the conventional battery protection chip with multiple power cells for driving the MOSFET.
In a first aspect, the utility model provides a voltage limiting protection chip of a battery, wherein the voltage limiting protection chip comprises a voltage detection circuit, a signal processing circuit, an overcurrent detection circuit, a logic control circuit and an output voltage limiting circuit;
the input end of the voltage detection circuit is connected with a voltage input terminal, the voltage input terminal is used for being connected with a battery voltage sampling circuit outside the chip, the output end of the voltage detection circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the logic control circuit, the input end of the overcurrent detection circuit is connected with the overcurrent detection terminal, and the output end of the overcurrent detection circuit is connected with the input end of the logic control circuit;
the output voltage limiting circuit comprises a voltage limiting control branch circuit and a voltage limiting branch circuit, wherein the input end of the voltage limiting control branch circuit is connected with the control signal output end of the logic control circuit, the first power supply end of the voltage limiting control branch circuit is grounded, the second power supply end of the voltage limiting control branch circuit is connected with the output end of the voltage limiting branch circuit, the input end of the voltage limiting branch circuit is connected with the voltage input terminal, and the output end of the voltage limiting control branch circuit is connected with the voltage output terminal.
Optionally, the voltage limiting control branch circuit includes a first field effect tube and a second field effect tube, a first end of the first field effect tube and a first end of the second field effect tube are connected with the control signal output end, a second end of the first field effect tube is connected with the output end of the voltage limiting branch circuit, a third end of the first field effect tube and a second end of the second field effect tube are connected with the voltage output terminal, and a third end of the second field effect tube is grounded.
Optionally, the control signal output end comprises a discharge control signal output end, the voltage output terminal comprises a discharge control voltage output terminal, and the output voltage limiting circuit comprises a discharge output voltage limiting circuit;
the discharge output voltage limiting circuit comprises a discharge voltage limiting control branch circuit and a discharge voltage limiting branch circuit, wherein the input end of the discharge voltage limiting control branch circuit is connected with the discharge control signal output end, the first power supply end of the discharge voltage limiting control branch circuit is grounded, the second power supply end of the discharge voltage limiting control branch circuit is connected with the output end of the discharge voltage limiting branch circuit, the input end of the discharge voltage limiting branch circuit is connected with the voltage input terminal, and the output end of the discharge voltage limiting control branch circuit is connected with the discharge control voltage output terminal.
Optionally, the discharge voltage limiting control branch circuit includes a third field effect tube and a fourth field effect tube, a first end of the third field effect tube and a first end of the fourth field effect tube are connected with the discharge control signal output end, a second end of the third field effect tube is connected with the output end of the discharge voltage limiting branch circuit, a third end of the third field effect tube and a second end of the fourth field effect tube are connected with the discharge control voltage output terminal, and a third end of the fourth field effect tube is grounded.
Optionally, the over-current detection circuit includes a discharge over-current detection branch, an input end of the discharge over-current detection branch is connected with the over-current detection terminal, and an output end of the discharge over-current detection branch is connected with an input end of the logic control circuit.
Optionally, the overcurrent detection circuit further includes a load short circuit detection branch, an input end of the load short circuit detection branch is connected to the overcurrent detection terminal, and an output end of the load short circuit detection branch is connected to an input end of the logic control circuit.
Optionally, the control signal output end comprises a charging control signal output end, the voltage output terminal comprises a charging control voltage output terminal, and the output voltage limiting circuit comprises a charging output voltage limiting circuit;
the charging output voltage limiting circuit comprises a charging voltage limiting control branch circuit and a charging voltage limiting branch circuit, wherein the input end of the charging voltage limiting control branch circuit is connected with the output end of a charging control signal, the first power supply end of the charging voltage limiting control branch circuit is grounded, the second power supply end of the charging voltage limiting control branch circuit is connected with the output end of the charging voltage limiting branch circuit, the input end of the charging voltage limiting branch circuit is connected with the voltage input terminal, and the output end of the charging voltage limiting control branch circuit is connected with the charging control voltage output terminal.
Optionally, the charging voltage limiting control branch circuit includes a fifth field effect tube and a sixth field effect tube, a first end of the fifth field effect tube and a first end of the sixth field effect tube are connected with the charging control signal output end, a second end of the fifth field effect tube is connected with the output end of the charging voltage limiting branch circuit, a third end of the fifth field effect tube and a second end of the sixth field effect tube are connected with the charging control voltage output terminal, and a third end of the sixth field effect tube is grounded.
Optionally, the over-current detection circuit includes a charging over-current detection branch, an input end of the charging over-current detection branch is connected with the over-current detection terminal, and an output end of the charging over-current detection branch is connected with an input end of the logic control circuit.
Optionally, the battery includes N battery cells, the voltage input terminal includes N voltage input terminals, each voltage input terminal is connected to an input end of the voltage detection circuit, each voltage input terminal is used for being connected to a battery voltage sampling circuit of a corresponding battery cell outside the chip, where N is an integer greater than 1.
According to the voltage limiting protection chip of the battery, voltage detection and signal processing are carried out on the sampled battery voltage through the voltage detection circuit and the signal processing circuit, whether the battery is in an overcharged state or an overdischarged state is determined to obtain corresponding voltage signals, the overcurrent detection circuit detects whether the battery is in a charged overcurrent state, a discharged overcurrent state or a load short circuit state to obtain corresponding overcurrent signals, the logic control circuit outputs a high-level signal or a low-level signal to the output voltage limiting circuit according to the corresponding voltage signals and the overcurrent signals, an actual power supply end of the voltage limiting control circuit is determined, and when the battery is in a normal working state, the actual power supply end is determined to be a second power supply end, so that the voltage limiting voltage output by the voltage output terminal Vout is controlled to be smaller than the voltage of the voltage input end VDD through the voltage limiting circuit, normal charge and discharge of the battery are controlled according to the charge and discharge MOS switch conduction outside the small voltage limiting driving chip, safety of the charge and discharge MOS switch is improved, and loss of the charge and discharge MOS switch is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a voltage limiting protection chip of a battery according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a voltage limiting protection chip of a battery according to an embodiment of the utility model;
FIG. 3 is a schematic diagram of a voltage limiting protection chip of a battery according to an embodiment of the utility model;
FIG. 4 is a schematic diagram of a voltage limiting protection chip of a battery according to an embodiment of the utility model;
FIG. 5 is a schematic diagram of a voltage limiting protection chip of a battery according to an embodiment of the utility model;
FIG. 6 is a schematic diagram of a voltage limiting protection chip of a battery according to an embodiment of the utility model;
in the figure, VDD is a voltage input terminal, VDD1 is a first voltage input terminal, VDD2 is a second voltage input terminal, vout is a voltage output terminal, VM is an overcurrent detection terminal, DO is a discharge control voltage output terminal, and CO is a charge control voltage output terminal.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.
It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.
Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. 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" and/or "comprising," when used in this specification, 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, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
The utility model provides a voltage limiting protection chip of a battery, which can limit the output voltage of the battery protection chip, and as shown in figure 1, the voltage limiting protection chip comprises a voltage detection circuit, a signal processing circuit, an overcurrent detection circuit, a logic control circuit and an output voltage limiting circuit.
The input end of the voltage detection circuit is connected with a voltage input terminal VDD, the voltage input terminal VDD is used for being connected with a battery voltage sampling circuit outside the chip, the output end of the voltage detection circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the logic control circuit, the input end of the overcurrent detection circuit is connected with an overcurrent detection terminal VM, and the output end of the overcurrent detection circuit is connected with the input end of the logic control circuit; the output voltage limiting circuit comprises a voltage limiting control branch and a voltage limiting branch, wherein the input end of the voltage limiting control branch is connected with the control signal output end of the logic control circuit, the first power supply end of the voltage limiting control branch is grounded, the second power supply end of the voltage limiting control branch is connected with the output end of the voltage limiting branch, the input end of the voltage limiting branch is connected with the voltage input terminal VDD, and the output end of the voltage limiting control branch is connected with the voltage output terminal Vout.
Specifically, the voltage detection circuit is connected with a battery voltage sampling circuit outside the chip through a voltage input terminal VDD, and is used for detecting the voltage of the battery obtained by sampling to obtain a corresponding voltage detection result, inputting the voltage detection result into the signal processing circuit, and determining whether the battery is in an overcharged state or an overdischarged state to obtain a corresponding voltage signal. The over-current detection circuit detects whether the battery is in a charging over-current state, a discharging over-current state or a load short-circuit state, and a corresponding over-current signal is obtained. And then, inputting the corresponding voltage signal and the corresponding overcurrent signal into the logic control circuit, so that the control signal output end outputs the corresponding high-level signal or low-level signal to the output voltage limiting circuit.
Specifically, when the battery voltage is between the preset voltage threshold intervals, the battery is not in an overcharged state or an overdischarged state, and when the overcurrent detection circuit detects that the battery is not in a charged overcurrent state, a discharged overcurrent state or a load short-circuit state, the battery is in a normal working state, and the actual power supply end is determined to be the second power supply end, namely the voltage limiting voltage output by the voltage output terminal Vout can be controlled to be smaller than the voltage of the voltage input end VDD through the voltage limiting circuit, so that the charge-discharge MOS switch outside the chip is driven to be conducted according to the smaller voltage, the battery is charged and discharged normally, the safety of the charge-discharge MOS switch is improved, and the loss of the charge-discharge MOS switch is reduced.
The preset voltage threshold interval is larger than the over-discharge protection voltage and smaller than the over-charge protection voltage. When the voltage of the battery is greater than the over-discharge protection voltage and less than the over-charge protection voltage, the battery is in a normal working state, and the actual power supply terminal is determined to be the second power supply terminal, the specific magnitude of the voltage limiting voltage can be set according to the actual situation, for example, in this embodiment, the voltage limiting voltage is set to be half of the voltage input terminal VDD.
According to the embodiment, voltage detection and signal processing are carried out on the sampled battery voltage through the voltage detection circuit and the signal processing circuit, whether the battery is in an overcharged state or an overdischarged state is determined to obtain a corresponding voltage signal, the overcurrent detection circuit detects whether the battery is in a charged overcurrent state, a discharged overcurrent state or a load short circuit state to obtain a corresponding overcurrent signal, the logic control circuit outputs a high-level signal or a low-level signal to the output voltage limiting circuit according to the corresponding voltage signal and the overcurrent signal, an actual power supply end of the voltage limiting control circuit is determined, and when the battery is in a normal working state, the actual power supply end is determined to be a second power supply end, so that the voltage limiting voltage output by the voltage output terminal Vout is controlled to be smaller than the voltage of the voltage input end VDD through the voltage limiting circuit, the charge-discharge MOS switch outside the chip is driven according to be conducted, the normal charge-discharge of the battery is controlled, the safety of the charge-discharge MOS switch is improved, and the loss of the charge-discharge MOS switch is reduced.
In an embodiment, as shown in fig. 2, on the basis of the above embodiment of the voltage limiting protection chip, the voltage limiting control branch includes a first field effect transistor and a second field effect transistor, a first end of the first field effect transistor and a first end of the second field effect transistor are connected to the control signal output end, a second end of the first field effect transistor is connected to the output end of the voltage limiting branch, a third end of the first field effect transistor and a second end of the second field effect transistor are connected to the voltage output terminal, and a third end of the second field effect transistor is grounded.
Specifically, when the battery is in a normal working state, the control signal output end outputs a corresponding high-level signal or low-level signal to the output voltage limiting circuit to control the first field effect transistor to be turned on and the second field effect transistor to be turned off, and as the second end of the first field effect transistor is connected with the output end of the voltage limiting branch, the voltage limiting voltage output by the voltage limiting voltage control voltage output terminal Vout can be smaller than the voltage of the voltage input end VDD.
In an embodiment, as shown in fig. 3, the first field effect transistor is a P-type field effect transistor, and the second field effect transistor is an N-type field effect transistor, so that when the battery is in a normal working state, the control signal output end outputs a low-level signal to the output voltage limiting circuit to control the first field effect transistor to be turned on and the second field effect transistor to be turned off.
In another embodiment, as shown in fig. 4, the first field effect transistor is an N-type field effect transistor, and the second field effect transistor is a P-type field effect transistor, so that when the battery is in a normal working state, the control signal output end outputs a high-level signal to the output voltage limiting circuit to control the first field effect transistor to be turned on and the second field effect transistor to be turned off.
According to the embodiment, the first field effect transistor and the second field effect transistor are controlled to be conducted or cut off through the signal output by the control signal output end, when the battery is in a normal working state, the first field effect transistor is controlled to be conducted, the second field effect transistor is cut off, the voltage limiting voltage output by the voltage limiting voltage control voltage output terminal Vout is smaller than the voltage of the voltage input end VDD, the charge-discharge MOS switch outside the chip is driven to be conducted according to the smaller voltage, normal charge-discharge of the battery is controlled, safety of the charge-discharge MOS switch is improved, and loss of the charge-discharge MOS switch is reduced.
In an embodiment, as shown in fig. 5, on the basis of the above-mentioned voltage limiting protection chip embodiment, the control signal output terminal includes a discharge control signal output terminal, the voltage output terminal Vout includes a discharge control voltage output terminal D0, and the output voltage limiting circuit includes a discharge output voltage limiting circuit.
The discharging output voltage limiting circuit comprises a discharging voltage limiting control branch and a discharging voltage limiting branch, wherein the input end of the discharging voltage limiting control branch is connected with a discharging control signal output end, the first power supply end of the discharging voltage limiting control branch is grounded, the second power supply end of the discharging voltage limiting control branch is connected with the output end of the discharging voltage limiting branch, the input end of the discharging voltage limiting branch is connected with a voltage input terminal VDD, and the output end of the discharging voltage limiting control branch is connected with a discharging control voltage output terminal DO.
Specifically, when the battery voltage is greater than the over-discharge protection voltage, the battery is not in an over-discharge state, meanwhile, the over-current detection circuit determines that the battery is not in an over-current state, and inputs a corresponding voltage signal and a corresponding current signal into the logic control circuit, so that the discharge control signal output end outputs a corresponding high-level signal or low-level signal to the discharge output voltage limiting circuit, the actual power supply end of the discharge voltage limiting control circuit is determined to be a second power supply end, and since the discharge voltage limiting control branch is connected with the discharge voltage limiting branch through the second power supply end, the voltage limiting voltage output by the discharge voltage limiting circuit is controlled to be smaller than the voltage of the voltage input end VDD, the discharge MOS switch outside the chip is driven to be conducted according to the smaller voltage, the battery is normally discharged, the safety of the discharge MOS switch is improved, and meanwhile, the loss of the discharge MOS switch is reduced.
According to the embodiment, when the battery is not in the overdischarge state and is not in the overcurrent state, the discharge voltage limiting circuit controls the voltage limiting voltage output by the discharge control voltage output terminal DO to be smaller than the voltage of the voltage input end VDD, so that the discharge MOS switch outside the chip is driven to be conducted according to the smaller voltage, the battery is normally discharged, the safety of the discharge MOS switch is improved, and meanwhile, the loss of the discharge MOS switch is reduced.
In an embodiment, as shown in fig. 5, on the basis of the above voltage limiting chip embodiment, the discharge voltage limiting control branch includes a third field effect transistor and a fourth field effect transistor, the first end of the third field effect transistor and the first end of the fourth field effect transistor are connected to the discharge control signal output end, the second end of the third field effect transistor is connected to the output end of the discharge voltage limiting branch, the third end of the third field effect transistor and the second end of the fourth field effect transistor are connected to the discharge control voltage output terminal, and the third end of the fourth field effect transistor is grounded.
Specifically, when the battery is not in an overdischarge state and is not in an overcurrent state, the discharge control signal output end outputs a corresponding high-level signal or low-level signal to the discharge output voltage limiting circuit, the third field effect transistor is controlled to be turned on, the fourth field effect transistor is controlled to be turned off, and as the second end of the third field effect transistor is connected with the output end of the discharge voltage limiting branch, the voltage limiting voltage output by the discharge control voltage output terminal DO can be controlled to be smaller than the voltage of the voltage input end VDD according to the voltage limiting voltage.
In an embodiment, the third field effect transistor is a P-type field effect transistor, the fourth field effect transistor is an N-type field effect transistor, and when the battery is not in an overdischarge state and is not in an overcurrent state, the discharge control signal output end outputs a low-level signal to the discharge output voltage limiting circuit to control the third field effect transistor to be turned on, and the fourth field effect transistor is turned off.
In another embodiment, the third field effect transistor is an N-type field effect transistor, and the fourth field effect transistor is a P-type field effect transistor, so that when the battery is not in an overdischarge state and is not in an overcurrent state, the discharge control signal output end outputs a high-level signal to the discharge output voltage limiting circuit to control the third field effect transistor to be turned on, and the fourth field effect transistor is turned off.
In the embodiment, the third field effect transistor and the fourth field effect transistor are controlled to be conducted or cut off through the signal output by the discharge control signal output end, when the battery is not in an overdischarge state and is not in an overcurrent state, the first field effect transistor is controlled to be conducted, and the second field effect transistor is controlled to be cut off, so that the voltage limiting voltage output by the discharge control voltage output terminal DO is controlled to be smaller than the voltage of the voltage input end VDD according to the voltage limiting voltage, the discharge MOS switch outside the chip is driven to be conducted according to the smaller voltage, the normal charge and discharge of the battery is controlled, the safety of the discharge MOS switch is improved, and meanwhile the loss of the discharge MOS switch is reduced.
In one embodiment, as shown in fig. 5, the over-current detection circuit includes a discharge over-current detection branch, an input end of the discharge over-current detection branch is connected to an over-current detection terminal, and an output end of the discharge over-current detection branch is connected to an input end of the logic control circuit. The discharge overcurrent detection branch circuit detects whether the battery is in a discharge overcurrent state or not, and inputs a corresponding discharge overcurrent signal to the logic control circuit as one of judgment bases of the working state of the battery, so that the logic control circuit outputs a corresponding high-level signal or low-level signal to perform voltage limiting control.
In an embodiment, as shown in fig. 5, the over-current detection circuit further includes a load short-circuit detection branch, an input end of the load short-circuit detection branch is connected to the over-current detection terminal, and an output end of the load short-circuit detection branch is connected to an input end of the logic control circuit. The load short circuit detection branch circuit detects whether the battery is in a load short circuit state or not, and inputs a corresponding load short circuit signal to the logic control circuit as one of judgment bases of the working state of the battery, so that the logic control circuit outputs a corresponding high-level signal or low-level signal to perform voltage limiting control.
In an embodiment, as shown in fig. 5, on the basis of the above-mentioned voltage limiting protection chip embodiment, the control signal output terminal includes a charge control signal output terminal, the voltage output terminal Vout includes a charge control voltage output terminal CO, and the output voltage limiting circuit includes a charge output voltage limiting circuit.
The charging output voltage limiting circuit comprises a charging voltage limiting control branch circuit and a charging voltage limiting branch circuit, wherein the input end of the charging voltage limiting control branch circuit is connected with a charging control signal output end, a first power supply end of the charging voltage limiting control branch circuit is grounded, a second power supply end of the charging voltage limiting control branch circuit is connected with the output end of the charging voltage limiting branch circuit, the input end of the charging voltage limiting branch circuit is connected with a voltage input terminal VDD, and the output end of the charging voltage limiting control branch circuit is connected with a charging control voltage output terminal CO.
Specifically, when the battery voltage is smaller than the overcharge protection voltage, the battery is not in an overcharge state, meanwhile, the overcurrent detection circuit determines that the battery is not in an overcurrent state, a corresponding voltage signal and a corresponding current signal are input into the logic control circuit, the charging control signal output end outputs a corresponding high-level signal or low-level signal to the charging output voltage limiting circuit, the actual power supply end of the charging voltage limiting control circuit is determined to be a second power supply end, and since the charging voltage limiting control branch is connected with the charging voltage limiting branch through the second power supply end, the voltage limiting voltage output by the charging voltage limiting circuit is controlled to be smaller than the voltage of the voltage input end VDD according to the voltage limiting voltage of the charging voltage limiting circuit, so that a charging MOS switch outside the chip is driven to be conducted according to the smaller voltage, the battery is normally charged, the safety of the charging MOS switch is improved, and meanwhile, the loss of the charging MOS switch is reduced.
According to the embodiment, when the battery is not in an overcharged state and is not in an overcurrent state, the charging voltage limiting circuit controls the voltage limiting voltage output by the charging control voltage output terminal CO to be smaller than the voltage of the voltage input end VDD, so that the charging MOS switch outside the chip is driven to be conducted according to the smaller voltage, the battery is charged normally, the safety of the charging MOS switch is improved, and meanwhile the loss of the charging MOS switch is reduced.
In an embodiment, as shown in fig. 5, based on the above voltage limiting chip embodiment, the charging voltage limiting control branch includes a fifth field effect transistor and a sixth field effect transistor, a first end of the fifth field effect transistor and a first end of the sixth field effect transistor are connected to the charging control signal output end, a second end of the fifth field effect transistor is connected to the output end of the charging voltage limiting branch, a fifth end of the fifth field effect transistor and a second end of the sixth field effect transistor are connected to the charging control voltage output terminal, and a fifth end of the sixth field effect transistor is grounded.
Specifically, when the battery is not in an overcharged state and is not in an overcurrent state, the charging control signal output end outputs a corresponding high-level signal or low-level signal to the charging output voltage limiting circuit, the fifth field effect transistor is controlled to be turned on, the sixth field effect transistor is turned off, and as the second end of the fifth field effect transistor is connected with the output end of the charging voltage limiting branch, the voltage limiting voltage output by the charging control voltage output terminal CO can be controlled to be smaller than the voltage of the voltage input end VDD according to the voltage limiting voltage.
In an embodiment, the fifth field effect transistor is a P-type field effect transistor, the sixth field effect transistor is an N-type field effect transistor, and when the battery is not in an overcharged state and is not in an overcurrent state, the charging control signal output end outputs a low-level signal to the charging output voltage limiting circuit to control the fifth field effect transistor to be turned on, and the sixth field effect transistor is turned off.
In another embodiment, the fifth field effect transistor is an N-type field effect transistor, and the sixth field effect transistor is a P-type field effect transistor, so that when the battery is not in an overcharged state and is not in an overcurrent state, the charging control signal output end outputs a high-level signal to the charging output voltage limiting circuit to control the fifth field effect transistor to be turned on, and the sixth field effect transistor is turned off.
According to the embodiment, the fifth field effect transistor and the sixth field effect transistor are controlled to be conducted or cut off through the signals output by the charging control signal output end, when the battery is not in an overcharged state and is not in an overcurrent state, the first field effect transistor is controlled to be conducted, the second field effect transistor is controlled to be cut off, the voltage limiting voltage output by the charging control voltage output terminal CO is controlled to be smaller than the voltage of the voltage input end VDD according to the voltage limiting voltage, the charging MOS switch outside the chip is driven to be conducted according to the smaller voltage, the battery is controlled to be charged normally, the safety of the charging MOS switch is improved, and meanwhile the loss of the charging MOS switch is reduced.
In an embodiment, as shown in fig. 5, the over-current detection circuit includes a charging over-current detection branch, an input end of the charging over-current detection branch is connected to an over-current detection terminal, and an output end of the charging over-current detection branch is connected to an input end of the logic control circuit. The charging overcurrent detection branch circuit detects whether the battery is in a charging overcurrent state or not, and inputs a corresponding charging overcurrent signal to the logic control circuit as one of judgment bases of the working state of the battery, so that the logic control circuit outputs a corresponding high-level signal or low-level signal to perform voltage limiting control.
In one embodiment, the battery includes N battery cells, the voltage input terminals include N voltage input terminals, each voltage input terminal is connected to an input end of the voltage detection circuit, and each voltage input terminal is used for being connected to a battery voltage sampling circuit of a corresponding battery cell outside the chip, where N is an integer greater than 1. In this embodiment, taking n=2, as shown in fig. 6, the voltage input terminals include a first voltage input terminal VDD1 and a second voltage input terminal VDD2, the first voltage input terminal VDD1 and the second voltage input terminal VDD2 are connected to the input end of the voltage detection circuit, the first voltage input terminal VDD1 is used to connect to the battery voltage sampling circuit of the first battery cell outside the chip, and the second voltage input terminal VDD2 is used to connect to the battery voltage sampling circuit of the second battery cell outside the chip.
And the battery voltage sampling circuit of the first battery cell samples to obtain a first voltage, the battery voltage sampling circuit of the second battery cell samples to obtain a second voltage, the first voltage and the second voltage are input into the voltage detection circuit to carry out voltage detection, and when the pressure difference between the first voltage and the second voltage are both between preset voltage threshold intervals, the battery is determined to be not in an overcharged state or an overdischarged state.
According to the embodiment, the battery is determined not to be in the overcharged state or the overdischarged state by respectively performing voltage sampling and voltage detection on the two battery cells, so that the accuracy of a voltage detection result is improved.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. The voltage limiting protection chip of the battery is characterized by comprising a voltage detection circuit, a signal processing circuit, an overcurrent detection circuit, a logic control circuit and an output voltage limiting circuit;
the input end of the voltage detection circuit is connected with a voltage input terminal, the voltage input terminal is used for being connected with a battery voltage sampling circuit outside the chip, the output end of the voltage detection circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the logic control circuit, the input end of the overcurrent detection circuit is connected with the overcurrent detection terminal, and the output end of the overcurrent detection circuit is connected with the input end of the logic control circuit;
the output voltage limiting circuit comprises a voltage limiting control branch circuit and a voltage limiting branch circuit, wherein the input end of the voltage limiting control branch circuit is connected with the control signal output end of the logic control circuit, the first power supply end of the voltage limiting control branch circuit is grounded, the second power supply end of the voltage limiting control branch circuit is connected with the output end of the voltage limiting branch circuit, the input end of the voltage limiting branch circuit is connected with the voltage input terminal, and the output end of the voltage limiting control branch circuit is connected with the voltage output terminal.
2. The voltage limiting protection chip of claim 1, wherein the voltage limiting control branch comprises a first field effect transistor and a second field effect transistor, a first end of the first field effect transistor and a first end of the second field effect transistor are connected with the control signal output end, a second end of the first field effect transistor is connected with the output end of the voltage limiting branch, a third end of the first field effect transistor and a second end of the second field effect transistor are connected with the voltage output terminal, and a third end of the second field effect transistor is grounded.
3. The voltage limiting protection chip of claim 1, wherein the control signal output comprises a discharge control signal output, the voltage output terminal comprises a discharge control voltage output terminal, and the output voltage limiting circuit comprises a discharge output voltage limiting circuit;
the discharge output voltage limiting circuit comprises a discharge voltage limiting control branch circuit and a discharge voltage limiting branch circuit, wherein the input end of the discharge voltage limiting control branch circuit is connected with the discharge control signal output end, the first power supply end of the discharge voltage limiting control branch circuit is grounded, the second power supply end of the discharge voltage limiting control branch circuit is connected with the output end of the discharge voltage limiting branch circuit, the input end of the discharge voltage limiting branch circuit is connected with the voltage input terminal, and the output end of the discharge voltage limiting control branch circuit is connected with the discharge control voltage output terminal.
4. The voltage limiting protection chip of claim 3, wherein the discharge voltage limiting control branch comprises a third field effect transistor and a fourth field effect transistor, a first end of the third field effect transistor and a first end of the fourth field effect transistor are connected with the discharge control signal output end, a second end of the third field effect transistor is connected with the output end of the discharge voltage limiting branch, a third end of the third field effect transistor and a second end of the fourth field effect transistor are connected with the discharge control voltage output terminal, and a third end of the fourth field effect transistor is grounded.
5. The voltage limiting protection chip of claim 3, wherein the over-current detection circuit comprises a discharge over-current detection branch, an input end of the discharge over-current detection branch is connected with the over-current detection terminal, and an output end of the discharge over-current detection branch is connected with an input end of the logic control circuit.
6. The voltage limiting protection chip of claim 5, wherein the over-current detection circuit further comprises a load short detection branch, an input end of the load short detection branch is connected to the over-current detection terminal, and an output end of the load short detection branch is connected to an input end of the logic control circuit.
7. The voltage limiting protection chip of claim 1, wherein the control signal output comprises a charge control signal output, the voltage output terminal comprises a charge control voltage output terminal, and the output voltage limiting circuit comprises a charge output voltage limiting circuit;
the charging output voltage limiting circuit comprises a charging voltage limiting control branch circuit and a charging voltage limiting branch circuit, wherein the input end of the charging voltage limiting control branch circuit is connected with the output end of a charging control signal, the first power supply end of the charging voltage limiting control branch circuit is grounded, the second power supply end of the charging voltage limiting control branch circuit is connected with the output end of the charging voltage limiting branch circuit, the input end of the charging voltage limiting branch circuit is connected with the voltage input terminal, and the output end of the charging voltage limiting control branch circuit is connected with the charging control voltage output terminal.
8. The voltage limiting protection chip of claim 7, wherein the charge voltage limiting control branch comprises a fifth field effect transistor and a sixth field effect transistor, a first end of the fifth field effect transistor and a first end of the sixth field effect transistor are connected to the charge control signal output end, a second end of the fifth field effect transistor is connected to the output end of the charge voltage limiting branch, a third end of the fifth field effect transistor and a second end of the sixth field effect transistor are connected to the charge control voltage output terminal, and a third end of the sixth field effect transistor is grounded.
9. The voltage limiting protection chip of claim 7, wherein the over-current detection circuit comprises a charging over-current detection branch, an input end of the charging over-current detection branch is connected with the over-current detection terminal, and an output end of the charging over-current detection branch is connected with an input end of the logic control circuit.
10. The voltage limiting protection chip of claim 1, wherein the battery comprises N power cells, the voltage input terminals comprise N voltage input terminals, each voltage input terminal is connected to an input end of the voltage detection circuit, each voltage input terminal is used for being connected to a battery voltage sampling circuit of a corresponding power cell outside the chip, and N is an integer greater than 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223370608.2U CN219304470U (en) | 2022-12-13 | 2022-12-13 | Voltage limiting protection chip of battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223370608.2U CN219304470U (en) | 2022-12-13 | 2022-12-13 | Voltage limiting protection chip of battery |
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| CN219304470U true CN219304470U (en) | 2023-07-04 |
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| CN202223370608.2U Active CN219304470U (en) | 2022-12-13 | 2022-12-13 | Voltage limiting protection chip of battery |
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| CN (1) | CN219304470U (en) |
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