CN114172111B - Voltage detection circuit and battery protection circuit - Google Patents
Voltage detection circuit and battery protection circuit Download PDFInfo
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- CN114172111B CN114172111B CN202111452576.8A CN202111452576A CN114172111B CN 114172111 B CN114172111 B CN 114172111B CN 202111452576 A CN202111452576 A CN 202111452576A CN 114172111 B CN114172111 B CN 114172111B
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- 238000001514 detection method Methods 0.000 title claims abstract description 206
- 239000003990 capacitor Substances 0.000 claims abstract description 53
- 230000005856 abnormality Effects 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
Abstract
The invention discloses a voltage detection circuit and a battery protection circuit, wherein the voltage detection circuit comprises a resistor voltage division detection branch, a capacitor voltage division detection branch and a logic processing circuit; the logic processing circuit is connected with the resistor partial pressure detection branch and the capacitor partial pressure detection branch and is used for sending a first modulation signal and a second modulation signal; the resistor voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for outputting a first detection signal to the logic processing circuit according to the first modulation signal; the capacitive voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for outputting a second detection signal to the logic processing circuit according to the second modulation signal; and the logic processing circuit is used for outputting a voltage detection signal according to the first detection signal or the second detection signal. The technical scheme can realize accurate driving voltage detection and reduce the low power consumption of the voltage detection circuit.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a voltage detection circuit and a battery protection circuit.
Background
With the wide application of new batteries and portable electronic products, in order to improve the reliability of the battery protection circuit, a charge protection transistor and a discharge protection transistor in the battery protection circuit are generally placed at the positive end of a lithium battery. The existing charge protection transistor and discharge protection transistor generally adopt an N-type MOS transistor as a high-side control device, and have the characteristics of lower on-resistance and lower cost.
The traditional lithium battery protection method adopts a charge pump to take electricity from the positive end of the lithium battery, and provides the electricity to the grid electrodes of the charge protection transistor and the discharge protection transistor after boosting, so as to realize the control of the charge protection transistor and the discharge protection transistor. Since the gates of the charge protection transistor and the discharge protection transistor generally have a leakage condition, it is necessary to monitor the voltages of the gates, the sources, and the drains of the charge protection transistor and the discharge protection transistor by a voltage detection circuit, so as to ensure that the charge protection transistor and the discharge protection transistor maintain a stable on state.
Because the voltages of the charge protection transistor and the discharge protection transistor need to be detected in real time, static power consumption is generated by the voltage detection circuit, and the boost voltage or the clock circuit in the battery protection circuit also needs to work all the time, so that the static power consumption of the battery protection circuit is higher.
Disclosure of Invention
The embodiment of the invention provides a voltage detection circuit and a battery protection circuit, which are used for solving the problem of overhigh static power consumption of the voltage detection circuit.
A voltage detection circuit comprises a resistor voltage division detection branch, a capacitor voltage division detection branch and a logic processing circuit;
the logic processing circuit is connected with the resistor partial pressure detection branch and the capacitor partial pressure detection branch and is used for sending a first modulation signal to the resistor partial pressure detection branch and sending a second modulation signal to the capacitor partial pressure detection branch;
the resistor voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for processing the driving voltage input by the driving voltage input end according to a first modulation signal and outputting a first detection signal to the logic processing circuit;
the capacitive voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for processing the driving voltage input by the driving voltage input end according to a second modulation signal and outputting a second detection signal to the logic processing circuit;
the logic processing circuit is used for outputting a voltage detection signal according to the first detection signal or the second detection signal.
Further, the capacitive voltage division detection branch is further connected to a battery voltage input end, and is configured to send an abnormality detection signal to the logic processing circuit when there is an abnormality in the battery voltage input by the battery voltage input end;
the logic processing circuit is further used for sending a third modulation signal to the resistor voltage division detection branch according to the abnormality detection signal;
the resistor voltage division detection branch is further used for processing the driving voltage input by the driving voltage input end according to a third modulation signal and outputting a third detection signal to the logic processing circuit;
the logic processing circuit is further configured to output a voltage detection signal according to the third detection signal.
Further, the resistor voltage division detection branch circuit comprises a resistor voltage division circuit and a first signal comparison circuit;
the first end of the resistor divider circuit is connected with the first output end of the logic processing circuit, the second end of the resistor divider circuit is connected with the driving voltage input end, the third end of the resistor divider circuit is connected with the first input end of the first signal comparison circuit, the second input end of the first signal comparison circuit is a first reference voltage input end, and the output end of the first signal comparison circuit is connected with the first input end of the logic processing circuit.
Further, the resistor divider circuit comprises a first transistor, a first resistor and a second resistor;
the first end of the first transistor is connected with the first output end of the logic processing circuit, the second end of the first transistor is connected with the first end of the first resistor, the third end of the first transistor is connected with the first end of the second resistor and the first input end of the first signal comparison circuit, the second end of the first resistor is connected with the driving voltage input end, and the second end of the second resistor is grounded.
Further, the capacitive voltage division detection branch circuit comprises a capacitive voltage division circuit and a second signal comparison circuit;
the first end of the capacitive voltage dividing circuit is connected with the second output end of the logic processing circuit, the second end of the capacitive voltage dividing circuit is connected with the battery voltage input end, the third end of the capacitive voltage dividing circuit is connected with the driving voltage input end, the fourth end of the capacitive voltage dividing circuit is connected with the first input end of the second signal comparison circuit, the second input end of the second signal comparison circuit is connected with the battery voltage input end, and the output end of the second signal comparison circuit is connected with the second input end of the logic processing circuit.
Further, the capacitive voltage division circuit comprises a second transistor, a first capacitor and a second capacitor;
the first end of the second transistor is connected with the second output end of the logic processing circuit, the second end of the second transistor is connected with the battery voltage input end, the third end of the second transistor is connected with the first end of the first capacitor, the first end of the second capacitor and the first input end of the second signal comparison circuit, the second end of the first capacitor is connected with the driving voltage input end, and the second end of the second capacitor is grounded.
Further, the logic processing circuit comprises a logic processor;
the first input end of the logic processor is connected with the resistor voltage division detection branch, the second input end of the logic processor is connected with the capacitor voltage division detection branch, the first output end of the logic processor is used for outputting the first modulation signal, and the second output end of the logic processor is used for outputting the second modulation signal.
Further, the logic processing circuit further comprises an oscillator; the oscillator is connected to a third input of the logic processor.
Further, the oscillator is a low frequency oscillator.
A battery protection circuit comprises a driving circuit, a boosting circuit, a logic judging circuit and the voltage detecting circuit;
the logic judging circuit is connected with the voltage detecting circuit, the driving circuit and the boosting circuit and is used for outputting a first control signal to the driving circuit and the boosting circuit;
the boost circuit is connected with the driving circuit and used for outputting boost voltage according to the first control signal;
the driving circuit is connected with a driving voltage input end of the voltage detection circuit and is used for outputting the driving voltage to the driving voltage input end according to the first control signal and the boosted voltage;
and the output end of the voltage detection circuit is connected with the logic judgment circuit and the booster circuit and is used for acquiring the driving voltage and outputting the voltage detection signal to the logic judgment circuit and the booster circuit.
The voltage detection circuit comprises a resistor voltage division detection branch circuit, a capacitor voltage division detection branch circuit and a logic processing circuit. In this embodiment, the logic processing circuit is connected to the resistive voltage division detecting branch and the capacitive voltage division detecting branch, and is configured to send the first modulation signal to the resistive voltage division detecting branch and send the second modulation signal to the capacitive voltage division detecting branch. The resistor voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for processing the driving voltage input by the driving voltage input end according to the first modulation signal and outputting a first detection signal to the logic processing circuit. The capacitive voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for processing the driving voltage input by the driving voltage input end according to the second modulation signal and outputting a second detection signal to the logic processing circuit; and the logic processing circuit outputs a voltage detection signal according to the first detection signal or the second detection signal, combines the resistance detection and capacitance detection modes, realizes accurate driving voltage detection, and reduces the low power consumption of the voltage detection circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, 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 detection circuit according to an embodiment of the invention;
FIG. 2 is a schematic diagram of another embodiment of a voltage detection circuit;
FIG. 3 is a schematic circuit diagram of a battery protection system according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a battery protection circuit according to an embodiment of the invention.
In the figure: 10. a resistor voltage division detection branch; 11. a resistor voltage dividing circuit; 12. a first signal comparison circuit; 20. a capacitive partial pressure detection branch; 21. a capacitive voltage divider circuit; 22. a second signal comparison circuit; 30. a logic processing circuit; 31. a logic processor; 32. an oscillator; 41. a battery protection circuit; 51. a signal detection circuit; 52. a logic judgment circuit; 53. a booster circuit; 54. a driving circuit; 55. and a voltage detection circuit.
Detailed Description
The following description of the embodiments of the present invention 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 invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the present invention 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 invention 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 invention.
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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" 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 invention, detailed structures and steps are presented in order to illustrate the technical solution presented by the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.
The present embodiment provides a voltage detection circuit 55, as shown in fig. 1, including a resistor voltage division detection branch 10, a capacitor voltage division detection branch 20, and a logic processing circuit 30; the logic processing circuit 30 is connected with the resistor partial pressure detection branch circuit 10 and the capacitor partial pressure detection branch circuit 20, and is used for sending a first modulation signal to the resistor partial pressure detection branch circuit 10 and sending a second modulation signal to the capacitor partial pressure detection branch circuit 20; the resistor voltage division detection branch circuit 10 is connected with the driving voltage input end DIN and the logic processing circuit 30, and is used for processing the driving voltage input by the driving voltage input end DIN according to a first modulation signal and outputting a first detection signal to the logic processing circuit 30; the capacitive voltage division detection branch 20 is connected with the driving voltage input end DIN and the logic processing circuit 30, and is used for processing the driving voltage input by the driving voltage input end DIN according to a second modulation signal and outputting a second detection signal to the logic processing circuit 30; the logic processing circuit 30 is configured to output a voltage detection signal according to the first detection signal or the second detection signal.
The voltage detection circuit 55 is applied to the battery protection circuit 41, and the battery protection circuit 41 is applied to the battery protection system. Alternatively, as shown in fig. 3, the battery protection system includes a voltage positive terminal, a voltage negative terminal, a lithium battery, a charge protection transistor M1, and a discharge protection transistor M2. Illustratively, the positive electrode of the lithium battery is connected to the battery voltage input terminal VDD of the battery protection circuit 41 and the source of the charge protection transistor M1, and the negative electrode of the lithium battery is connected to the ground terminal and the voltage negative terminal of the battery protection circuit 41. The gate of the charge protection transistor M1 is connected to the CO terminal of the battery protection circuit 41, the drain of the charge protection transistor M1 is connected to the drain of the discharge protection transistor M2, the gate of the discharge protection transistor M2 is connected to the DO terminal of the battery protection circuit 41, and the source of the discharge protection transistor M2 is connected to the voltage positive terminal and the voltage peak input terminal VM of the discharge protection transistor M2.
As an example, as shown in fig. 4, the battery protection circuit 41 includes a signal detection circuit 51, a logic determination circuit 52, a booster circuit 53, a drive circuit 54, and a voltage detection circuit 55. The signal detection circuit 51 is connected to the battery voltage input terminal VDD, the voltage peak input terminal VM, the ground terminal VSS, and the logic determination circuit 52, and is configured to determine the battery voltage input from the battery voltage input terminal VDD and the peak voltage input from the voltage peak input terminal VM, and output a logic signal. A logic judgment circuit 52 connected to the voltage detection circuit 55, the driving circuit 54, and the booster circuit 53, for outputting a first control signal to the driving circuit 54 and the booster circuit 53 based on the logic signal; a boost circuit 53 connected to the driving circuit 54 for outputting a boost voltage according to the first control signal; a driving circuit 54 connected to the driving voltage input terminal DIN of the voltage detection circuit 55 for outputting a driving voltage to the driving voltage input terminal DIN according to the first control signal and the boosted voltage; the output terminal of the voltage detection circuit 55 is connected to the logic determination circuit 52 and the booster circuit 53, and is used for obtaining the driving voltage and outputting a voltage detection signal to the logic determination circuit 52 and the booster circuit 53.
As an example, the voltage detection circuit 55 includes a resistive voltage division detection branch 10, a capacitive voltage division detection branch 20, and a logic processing circuit 30. In this example, the voltage detection circuit 55 can perform time-sharing control on the resistive voltage division detection branch and the capacitive voltage division detection branch 20 through the logic processing circuit 30, so that the static loss generated by the resistive voltage division detection branch 10 under high driving voltage can be reduced.
As an example, the logic processing circuit 30 is connected to the resistive voltage division detecting branch 10 and the capacitive voltage division detecting branch 20, and is configured to send a first modulation signal to the resistive voltage division detecting branch 10 and send a second modulation signal to the capacitive voltage division detecting branch 20. Optionally, the first modulation signal and the second modulation signal are PWM (Pulse width modulation, pulse width modulation, PWM for short) signals. For example, the high level or low level time of the first modulation signal and the second modulation signal may be set according to actual requirements. Preferably, the first modulation signal and the second modulation signal are opposite in level at the same time to realize time-sharing control.
As another example, the resistor voltage division detecting branch 10 is connected to the driving voltage input terminal DIN and the logic processing circuit 30, and is configured to process the driving voltage input by the driving voltage input terminal DIN according to the first modulation signal, and output the first detection signal to the logic processing circuit 30. In this example, after the charge protection transistor M1 or the discharge protection transistor M2 is in the on mode, the driving circuit 54 outputs the driving voltage to the charge protection transistor M1 or the discharge protection transistor M2 and the driving voltage input terminal DIN, and after the resistor voltage division detecting branch 10 receives the first modulation signal, the resistor voltage division detecting branch 10 is turned on, performs voltage division processing on the driving voltage, and outputs the first detection signal to the logic processing circuit 30. In this example, since the voltage value of the driving voltage is generally high, if the resistor voltage division detecting branch 10 is used for detecting the driving voltage for a long time, a large loss is generated, so the first modulation signal is used to control the resistor voltage division detecting branch 10, so that the resistor voltage division detecting branch 10 is prevented from detecting the driving voltage for a long time, and the static power consumption of the voltage detecting circuit 55 is reduced.
As another example, the capacitive voltage division detecting branch 20 is connected to the driving voltage input terminal DIN and the logic processing circuit 30, and is configured to process the driving voltage input by the driving voltage input terminal DIN according to the second modulation signal, and output the second detection signal to the logic processing circuit 30. In this example, when the first modulation signal controls the resistive voltage division detecting branch circuit 10 to stop operating, for example, when the first modulation signal is at a low level, the resistive voltage division detecting branch circuit 10 stops operating, and at this time, the capacitive voltage division detecting branch circuit 20 receives a second modulation signal at a high level, controls the capacitive voltage division detecting branch circuit 20 to be turned on, processes the driving voltage input from the driving voltage input terminal DIN, and outputs the second detection signal to the logic processing circuit 30. The logic processing circuit 30 can output a voltage detection signal based on the first detection signal or the second detection signal, thereby detecting the driving voltage.
Further, since the first modulation signal and the second modulation signal are PWM signals that can be modulated, the duty ratios of the first modulation signal and the second modulation signal can be reasonably configured according to actual requirements, so that the logic processing circuit 30 controls the resistor voltage division detection circuit 10 and the capacitor voltage division detection circuit 20 to perform time-sharing operation through the first modulation signal and the second modulation signal, so as to reduce the average power consumption of the battery protection circuit 41.
In the present embodiment, the voltage detection circuit 55 includes a resistive voltage division detection branch 10, a capacitive voltage division detection branch 20, and a logic processing circuit 30. In this embodiment, the logic processing circuit 30 is connected to the resistive voltage division detecting branch 10 and the capacitive voltage division detecting branch 20, and is configured to send a first modulation signal to the resistive voltage division detecting branch 10 and send a second modulation signal to the capacitive voltage division detecting branch 20. The resistor voltage division detecting branch 10 is connected to the driving voltage input terminal DIN and the logic processing circuit 30, and is configured to process the driving voltage input by the driving voltage input terminal DIN according to the first modulation signal, and output a first detection signal to the logic processing circuit 30. The capacitive voltage division detection branch 20 is connected with the driving voltage input end DIN and the logic processing circuit 30, and is used for processing the driving voltage input by the driving voltage input end DIN according to a second modulation signal and outputting a second detection signal to the logic processing circuit 30; and the logic processing circuit 30 outputs a voltage detection signal according to the first detection signal or the second detection signal, and combines the resistance detection and capacitance detection modes, so as to realize accurate driving voltage detection and reduce the low power consumption of the voltage detection circuit 55.
In one embodiment, as shown in fig. 2, the capacitive voltage division detecting branch 20 is further connected to the battery voltage input terminal VDD, and is configured to send an abnormality detecting signal to the logic processing circuit 30 when there is an abnormality in the battery voltage input by the battery voltage input terminal VDD; the logic processing circuit 30 is further configured to send a third modulation signal to the resistor voltage division detection branch 10 according to the anomaly detection signal; the resistor voltage division detecting branch circuit 10 is further configured to process the driving voltage input by the driving voltage input terminal DIN according to the third modulation signal, and output a third detection signal to the logic processing circuit 30; the logic processing circuit 30 is further configured to output a voltage detection signal according to the third detection signal.
As an example, the capacitive voltage division detection branch 20 is also connected to the battery voltage input terminal VDD. The battery voltage input end VDD is used for being connected with the anode of the lithium battery to obtain the battery voltage of the lithium battery. When there is an abnormality in the battery voltage input at the battery voltage input terminal VDD, the capacitive voltage division detection branch 20 transmits an abnormality detection signal to the logic processing circuit 30.
As another example, the logic processing circuit 30 transmits a third modulation signal to the resistive voltage division detection branch 10 according to the abnormality detection signal, and after receiving the third modulation signal, the resistive voltage division detection branch 10 processes the driving voltage input to the driving voltage input terminal DIN according to the third modulation signal, outputs the third detection signal to the logic processing circuit 30, and the logic processing circuit 30 outputs the third detection signal. For example, when the Vgs (voltage between the source and the gate) voltage of the charge protection transistor M1 or the discharge protection transistor M2 is leaked or the battery voltage is changed, the capacitive voltage division detection branch 20 detects that there is an abnormality in the battery voltage, and sends an abnormality detection signal to the logic processing circuit 30. The logic processing circuit 30 sends a third modulation signal to control the resistor voltage division detecting branch circuit 10 to be turned on, and outputs a voltage detection signal to the logic judging circuit 52 in the above embodiment, the logic judging circuit 52 accelerates the boosting capability of the boosting circuit 53, timely supplements the driving circuit 54 of the charge protection transistor M1 or the discharge protection transistor M2, and after the completion of the power supplement, the capacitor voltage division detecting branch circuit 20 is restarted to operate, and the resistor voltage division detecting branch circuit 10 is turned off, so that the voltage detecting circuit 55 enters the low power consumption mode.
In this embodiment, by connecting the capacitive voltage division detecting branch 20 with the battery voltage input terminal VDD, when there is an abnormality in the battery voltage input by the capacitive voltage division detecting branch 20, an abnormality detecting signal is sent to the logic processing circuit 30, so that the logic processing circuit 30 sends a third modulating signal to the resistive voltage division detecting branch 10 according to the abnormality detecting signal, further, the resistive voltage division detecting branch 10 processes the driving voltage input by the driving voltage input terminal DIN according to the third modulating signal, the third detecting signal is output to the logic processing circuit 30, and finally, the logic processing circuit 30 outputs the voltage detecting signal according to the third detecting signal, thereby realizing timely power compensation to the driving circuit 54 of the charging protection transistor M1 or the discharging protection transistor M2 when the voltage of Vgs (voltage between the source and the gate) of the charging protection transistor M1 or the discharging protection transistor M2 is leaked or the battery voltage is changed, improving the reliability of the battery protection circuit 41 and reducing the power consumption of the voltage detecting circuit 55.
In one embodiment, as shown in fig. 2, the resistor-divider detection branch 10 includes a resistor-divider circuit 11 and a first signal comparison circuit 12; the first end of the resistor divider circuit 11 is connected to the first output end of the logic processing circuit 30, the second end of the resistor divider circuit 11 is connected to the driving voltage input end DIN, the third end of the resistor divider circuit 11 is connected to the first input end of the first signal comparison circuit 12, the second input end of the first signal comparison circuit 12 is the first reference voltage input end, and the output end of the first signal comparison circuit 12 is connected to the first input end of the logic processing circuit 30.
As an example, the first terminal of the resistor divider circuit 11 is connected to the first output terminal of the logic processing circuit 30, and is configured to receive the first modulation signal output by the logic processing circuit 30. A second terminal of the resistor divider circuit 11 is connected to the driving voltage input terminal DIN for receiving the driving voltage, and a third terminal of the resistor divider circuit 11 is connected to the first input terminal of the first signal comparison circuit 12 for inputting the divided driving voltage to the first signal comparison circuit 12. The second input end of the first signal comparison circuit 12 is a first reference voltage input end, and is used for receiving a first reference voltage, the output end of the first signal comparison circuit 12 is connected with the first input end of the logic processing circuit 30, and is used for comparing the driving voltage after the voltage division processing with the first reference voltage, and outputting a first detection signal to the logic processing circuit 30, so that the driving voltage detection of the resistor voltage division detection mode is realized.
Optionally, the first signal comparing circuit 12 includes a first comparator, a first input terminal of which is connected to the third terminal of the resistor divider circuit 11, a second input terminal of which is a first reference voltage input terminal, and an output terminal of which is connected to a first input terminal of the logic processing circuit 30.
In the present embodiment, the resistive voltage division detection branch 10 includes a resistive voltage division circuit 11 and a first signal comparison circuit 12. In this embodiment, the first end of the resistor divider circuit 11 is connected to the first output end of the logic processing circuit 30, the second end of the resistor divider circuit 11 is connected to the driving voltage input end DIN, the third end of the resistor divider circuit 11 is connected to the first input end of the first signal comparing circuit 12, the second input end of the first signal comparing circuit 12 is the first reference voltage input end, and the output end of the first signal comparing circuit 12 is connected to the first input end of the logic processing circuit 30, so that the driving voltage detection in the resistor divider detection mode can be realized.
In one embodiment, as shown in fig. 2, the resistor divider circuit 11 includes a first transistor M11, a first resistor R11, and a second resistor R12; the first end of the first transistor M11 is connected to the first output terminal of the logic processing circuit 30, the second end of the first transistor M11 is connected to the first end of the first resistor R11, the third end of the first transistor M11 is connected to the first end of the second resistor R12 and the first input terminal of the first signal comparison circuit 12, the second end of the first resistor R11 is connected to the driving voltage input terminal DIN, and the second end of the second resistor R12 is grounded.
Preferably, the first transistor M11 is a MOS transistor, the first end of the first transistor M11 is a gate, the second end of the first transistor M11 is a source, and the third end of the first transistor M11 is a drain.
As an example, a first terminal of the first transistor M11 is connected to a first output terminal of the logic processing circuit 30, and is configured to receive the first modulated signal output by the logic processing circuit 30. The second end of the first transistor M11 is connected to the first end of the first resistor R11, the third end of the first transistor M11 is connected to the first end of the second resistor R12 and the first input end of the first signal comparison circuit 12, the second end of the first resistor R11 is connected to the driving voltage input end DIN, and the second end of the second resistor R12 is grounded. When the first transistor M11 is turned on, the first resistor R11 and the second resistor R12 divide the driving voltage, and the divided driving voltage is input to the first input terminal of the first signal comparison circuit 12. The first signal comparison circuit 12 compares the divided driving voltage with a first reference voltage, and outputs a first detection signal to the logic processing circuit 30, thereby realizing detection of the driving voltage by the resistive division detection method.
In the present embodiment, the resistor divider circuit 11 includes a first transistor M11, a first resistor R11, and a second resistor R12. In this embodiment, the first end of the first transistor M11 is connected to the first output end of the logic processing circuit 30, the second end of the first transistor M11 is connected to the first end of the first resistor R11, the third end of the first transistor M11 is connected to the first end of the second resistor R12 and the first input end of the first signal comparison circuit 12, the second end of the first resistor R11 is connected to the driving voltage input end DIN, and the second end of the second resistor R12 is grounded, so that the driving voltage detection in the resistor voltage division detection mode can be realized.
In one embodiment, as shown in fig. 2, the capacitive division detecting branch 20 includes a capacitive division circuit 21 and a second signal comparing circuit 22; the first end of the capacitive voltage dividing circuit 21 is connected to the second output terminal of the logic processing circuit 30, the second end of the capacitive voltage dividing circuit 21 is connected to the battery voltage input terminal VDD, the third end of the capacitive voltage dividing circuit 21 is connected to the driving voltage input terminal DIN, the fourth end of the capacitive voltage dividing circuit 21 is connected to the first input terminal of the second signal comparing circuit 22, the second input terminal of the second signal comparing circuit 22 is connected to the battery voltage input terminal VDD, and the output terminal of the second signal comparing circuit 22 is connected to the second input terminal of the logic processing circuit 30.
As an example, the first end of the capacitive voltage dividing circuit 21 is connected to the second output end of the logic processing circuit 30, for receiving the second modulation signal output by the logic processing circuit 30, the second end of the capacitive voltage dividing circuit 21 is connected to the battery voltage input end VDD, for receiving the battery voltage, the third end of the capacitive voltage dividing circuit 21 is connected to the driving voltage input end DIN, for receiving the driving voltage, the fourth end of the capacitive voltage dividing circuit 21 is connected to the first input end of the second signal comparing circuit 22, and when detecting that the battery voltage input by the battery voltage input end VDD is not abnormal, the capacitive voltage dividing circuit 21 divides the driving voltage and sends the divided driving voltage to the first input end of the second signal comparing circuit 22. When there is an abnormality in the battery voltage input at the battery voltage input terminal VDD, the capacitive voltage dividing circuit 21 transmits the abnormal battery voltage to the second signal comparing circuit 22. The second input terminal of the second signal comparing circuit 22 is connected to the battery voltage input terminal VDD, the output terminal of the second signal comparing circuit 22 is connected to the second input terminal of the logic processing circuit 30, and if the first input terminal of the second signal comparing circuit 22 receives the divided driving voltage, the divided driving voltage is compared with the battery voltage received by the second input terminal of the second signal comparing circuit 22, and the second detection signal is output to the logic processing circuit 30. If the first input terminal of the second signal comparison circuit 22 receives the abnormal battery voltage, the abnormal battery voltage is compared with the battery voltage received by the second input terminal of the second signal comparison circuit 22, and a third detection signal is output to the logic processing circuit 30, so that the driving voltage detection of the capacitive voltage division detection mode can be realized.
In the present embodiment, the capacitive division detecting branch 20 includes a capacitive division circuit 21 and a second signal comparing circuit 22. In this embodiment, the first end of the capacitive voltage dividing circuit 21 is connected to the second output end of the logic processing circuit 30, the second end of the capacitive voltage dividing circuit 21 is connected to the battery voltage input end VDD, the third end of the capacitive voltage dividing circuit 21 is connected to the driving voltage input end DIN, the fourth end of the capacitive voltage dividing circuit 21 is connected to the first input end of the second signal comparing circuit 22, the second input end of the frame second signal comparing circuit 22 is connected to the battery voltage input end VDD, and the output end of the second signal comparing circuit 22 is connected to the second input end of the logic processing circuit 30, so that the driving voltage detection in the capacitive voltage dividing detection mode can be realized.
In one embodiment, as shown in fig. 2, the capacitive voltage division circuit 21 includes a second transistor M21, a first capacitor C21, and a second capacitor C22; the first end of the second transistor M21 is connected to the second output end of the logic processing circuit 30, the second end of the second transistor M21 is connected to the battery voltage input end VDD, the third end of the second transistor M21 is connected to the first end of the first capacitor C21, the first end of the second capacitor C22 and the first input end of the second signal comparison circuit 22, the second end of the first capacitor C21 is connected to the driving voltage input end DIN, and the second end of the second capacitor C22 is grounded.
Preferably, the second transistor M21 is a MOS transistor, the first end of the first transistor M11 is a gate, the second end of the second transistor M21 is a source, and the third end of the first transistor M11 is a drain.
As an example, the first end of the second transistor M21 is connected to the second output end of the logic processing circuit 30, for receiving the second modulation signal output by the logic processing circuit 30, the second end of the second transistor M21 is connected to the battery voltage input end VDD, for receiving the battery voltage, the third end of the second transistor M21 is connected to the first end of the first capacitor C21, the first end of the second capacitor C22 and the first input end of the second signal comparison circuit 22, the second end of the first capacitor C21 is connected to the driving voltage input end DIN, the second end of the second capacitor C22 is grounded, when the first end of the second transistor M21 receives the second modulation signal, the second transistor M21 is turned on, the driving voltage is divided, the divided driving voltage is input to the first input end of the second signal comparison circuit 22, and the divided driving voltage is compared with the battery voltage, so as to output the first detection signal. When the first end of the second transistor M21 receives the second modulation signal, the second transistor M21 is turned on, and when the battery voltage received by the battery voltage input end VDD connected to the second end of the second transistor M21 is abnormal, the second signal comparing circuit 22 compares the abnormal battery voltage with the battery voltage received by the second input end of the second signal comparing circuit 22, and outputs an abnormal detection signal, so that the driving voltage detection in the capacitive voltage division detection mode can be realized.
In the present embodiment, the capacitance dividing circuit 21 includes a second transistor M21, a first capacitance C21, and a second capacitance C22. In this embodiment, the first end of the second transistor M21 is connected to the second output end of the logic processing circuit 30, the second end of the second transistor M21 is connected to the battery voltage input end VDD, the third end of the second transistor M21 is connected to the first end of the first capacitor C21, the first end of the second capacitor C22 and the first input end of the second signal comparison circuit 22, the second end of the first capacitor C21 is connected to the driving voltage input end DIN, and the second end of the second capacitor C22 is grounded, so that the driving voltage detection in the capacitive voltage division detection mode can be realized.
In one embodiment, as shown in FIG. 2, the logic processing circuit 30 includes a logic processor 31; a first input terminal of the logic processor 31 is connected to the resistor voltage division detecting branch 10, a second input terminal of the logic processor 31 is connected to the capacitor voltage division detecting branch 20, a first output terminal of the logic processor 31 is used for outputting a first modulation signal, and a second output terminal of the logic processor 31 is used for outputting a second modulation signal.
In this embodiment, the logic processing circuit 30 includes a logic processor 31, a first input end of the logic processor 31 is connected to the resistor voltage division detecting branch 10, a second input end of the logic processor 31 is connected to the capacitor voltage division detecting branch 20, a first output end of the logic processor 31 is used for outputting a first modulation signal, and a second output end of the logic processor 31 is used for outputting a second modulation signal, so that time-sharing control over the resistor voltage division detecting branch 10 and the capacitor voltage division detecting branch 20 is realized, and loss of the voltage detecting circuit 55 is reduced.
In one embodiment, as shown in FIG. 2, logic processing circuit 30 also includes an oscillator 32; the oscillator 32 is connected to a third input of the logic processor 31.
In the present embodiment, the logic processing circuit 30 further includes an oscillator 32; the oscillator 32 is connected to a third input of the logic processor 31 for causing the logic processor 31 to generate the first and second modulated signals.
In one embodiment, the oscillator 32 is a low frequency oscillator 32.
The present embodiment provides a battery protection circuit 41, as shown in fig. 4, including a driving circuit 54, a boosting circuit 53, a logic judgment circuit 52, and the above-described voltage detection circuit 55; a logic judgment circuit 52 connected to the voltage detection circuit 55, the driving circuit 54, and the booster circuit 53 for outputting a first control signal to the driving circuit 54 and the booster circuit 53; a boost circuit 53 connected to the driving circuit 54 for outputting a boost voltage according to the first control signal; a driving circuit 54 connected to the driving voltage input terminal DIN of the voltage detection circuit 55 for outputting a driving voltage to the driving circuit 54 according to the first control signal and the boosted voltage; the output terminal of the voltage detection circuit 55 is connected to the logic determination circuit 52 and the booster circuit 53, and is used for obtaining the driving voltage and outputting a voltage detection signal to the logic determination circuit 52 and the booster circuit 53.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention 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 invention, and are intended to be included in the scope of the present invention.
Claims (9)
1. The voltage detection circuit is characterized by comprising a resistor voltage division detection branch, a capacitor voltage division detection branch and a logic processing circuit;
the logic processing circuit is connected with the resistor partial pressure detection branch and the capacitor partial pressure detection branch and is used for sending a first modulation signal to the resistor partial pressure detection branch and sending a second modulation signal to the capacitor partial pressure detection branch; wherein the first modulation signal and the second modulation signal are opposite in level at the same time;
the resistor voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for processing the driving voltage input by the driving voltage input end according to a first modulation signal and outputting a first detection signal to the logic processing circuit; the resistor voltage division detection branch circuit comprises a first transistor, a first resistor and a second resistor; the first end of the first transistor is connected with the first output end of the logic processing circuit and is used for receiving the first modulation signal, the second end of the first transistor is connected with the first end of the first resistor, the third end of the first transistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the driving voltage input end, and the second end of the second resistor is grounded;
The capacitive voltage division detection branch is connected with the driving voltage input end and the logic processing circuit and is used for processing the driving voltage input by the driving voltage input end according to a second modulation signal and outputting a second detection signal to the logic processing circuit; the capacitive voltage division detection branch circuit comprises a second transistor, a first capacitor, a second capacitor and a second signal comparison circuit; the first capacitor and the second capacitor are arranged in series between the driving voltage input end and the grounding end; the first end of the second transistor is connected with the second output end of the logic processing circuit and is used for receiving the second modulation signal, the second end of the second transistor is connected with the battery voltage input end, and the third end of the second transistor is connected with a connection node between the first capacitor and the second capacitor; a first input end of the second signal comparison circuit is connected with a connecting node between the first capacitor and the second capacitor, and a second input end of the second signal comparison circuit is connected with the battery voltage input end;
the on logic of the first transistor and the second transistor are opposite;
The logic processing circuit is used for outputting a voltage detection signal according to the first detection signal or the second detection signal;
the capacitive voltage division detection branch is also connected with a battery voltage input end and is used for sending an abnormality detection signal to the logic processing circuit when the battery voltage input by the battery voltage input end is abnormal;
the logic processing circuit is further used for sending a third modulation signal to the resistor voltage division detection branch according to the abnormality detection signal;
the resistor voltage division detection branch is further used for processing the driving voltage input by the driving voltage input end according to a third modulation signal and outputting a third detection signal to the logic processing circuit;
the logic processing circuit is further configured to output a voltage detection signal according to the third detection signal.
2. The voltage detection circuit of claim 1, wherein the resistive voltage division detection branch comprises a resistive voltage division circuit and a first signal comparison circuit;
the first end of the resistor divider circuit is connected with the first output end of the logic processing circuit, the second end of the resistor divider circuit is connected with the driving voltage input end, the third end of the resistor divider circuit is connected with the first input end of the first signal comparison circuit, the second input end of the first signal comparison circuit is a first reference voltage input end, and the output end of the first signal comparison circuit is connected with the first input end of the logic processing circuit.
3. The voltage detection circuit of claim 2, wherein the resistor divider circuit comprises a first transistor, a first resistor, and a second resistor;
the first end of the first transistor is connected with the first output end of the logic processing circuit, the second end of the first transistor is connected with the first end of the first resistor, the third end of the first transistor is connected with the first end of the second resistor and the first input end of the first signal comparison circuit, the second end of the first resistor is connected with the driving voltage input end, and the second end of the second resistor is grounded.
4. The voltage detection circuit of claim 2, wherein the capacitive division detection branch comprises a capacitive division circuit and a second signal comparison circuit;
the first end of the capacitive voltage dividing circuit is connected with the second output end of the logic processing circuit, the second end of the capacitive voltage dividing circuit is connected with the battery voltage input end, the third end of the capacitive voltage dividing circuit is connected with the driving voltage input end, the fourth end of the capacitive voltage dividing circuit is connected with the first input end of the second signal comparison circuit, the second input end of the second signal comparison circuit is connected with the battery voltage input end, and the output end of the second signal comparison circuit is connected with the second input end of the logic processing circuit.
5. The voltage detection circuit of claim 4, wherein the capacitive dividing circuit comprises a second transistor, a first capacitor, and a second capacitor;
the first end of the second transistor is connected with the second output end of the logic processing circuit, the second end of the second transistor is connected with the battery voltage input end, the third end of the second transistor is connected with the first end of the first capacitor, the first end of the second capacitor and the first input end of the second signal comparison circuit, the second end of the first capacitor is connected with the driving voltage input end, and the second end of the second capacitor is grounded.
6. The voltage detection circuit of claim 1, wherein the logic processing circuit comprises a logic processor;
the first input end of the logic processor is connected with the resistor voltage division detection branch, the second input end of the logic processor is connected with the capacitor voltage division detection branch, the first output end of the logic processor is used for outputting the first modulation signal, and the second output end of the logic processor is used for outputting the second modulation signal.
7. The voltage detection circuit of claim 6, wherein the logic processing circuit further comprises an oscillator; the oscillator is connected to a third input of the logic processor.
8. The voltage detection circuit of claim 7, wherein the oscillator is a low frequency oscillator.
9. A battery protection circuit comprising a drive circuit, a booster circuit, a logic judgment circuit, and the voltage detection circuit according to any one of claims 1 to 8;
the logic judging circuit is connected with the voltage detecting circuit, the driving circuit and the boosting circuit and is used for outputting a first control signal to the driving circuit and the boosting circuit;
the boost circuit is connected with the driving circuit and used for outputting boost voltage according to the first control signal;
the driving circuit is connected with a driving voltage input end of the voltage detection circuit and is used for outputting the driving voltage to the driving voltage input end according to the first control signal and the boosted voltage;
and the output end of the voltage detection circuit is connected with the logic judgment circuit and the booster circuit and is used for acquiring the driving voltage and outputting the voltage detection signal to the logic judgment circuit and the booster circuit.
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| CN106501585A (en) * | 2016-12-09 | 2017-03-15 | 合肥中感微电子有限公司 | One kind overcharges power detection circuit and battery protection system |
| CN107294376A (en) * | 2016-03-30 | 2017-10-24 | 中芯国际集成电路制造(上海)有限公司 | Charge pump regulator and memory, internet of things equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107294376A (en) * | 2016-03-30 | 2017-10-24 | 中芯国际集成电路制造(上海)有限公司 | Charge pump regulator and memory, internet of things equipment |
| CN106501585A (en) * | 2016-12-09 | 2017-03-15 | 合肥中感微电子有限公司 | One kind overcharges power detection circuit and battery protection system |
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