CN114172111A - Voltage detection circuit and battery protection circuit - Google Patents
Voltage detection circuit and battery protection circuit Download PDFInfo
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- CN114172111A CN114172111A CN202111452576.8A CN202111452576A CN114172111A CN 114172111 A CN114172111 A CN 114172111A CN 202111452576 A CN202111452576 A CN 202111452576A CN 114172111 A CN114172111 A CN 114172111A
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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
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Abstract
The invention discloses a voltage detection circuit and a battery protection circuit, wherein the voltage detection circuit comprises a resistance voltage division detection branch circuit, a capacitance voltage division detection branch circuit and a logic processing circuit; the logic processing circuit is connected with the resistance voltage division detection branch circuit and the capacitance voltage division detection branch circuit and is used for sending a first modulation signal and a second modulation signal; the resistor voltage division detection branch circuit is connected with the driving voltage input end and the logic processing circuit and used for outputting a first detection signal to the logic processing circuit according to the first modulation signal; the capacitance voltage division detection branch circuit 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 a 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. According to the technical scheme, accurate driving voltage detection can be realized, and the low power consumption of the voltage detection circuit is reduced.
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, the charge protection transistor and the discharge protection transistor in the battery protection circuit are generally placed at the positive end of the lithium battery. The existing charge protection transistor and discharge protection transistor generally adopt an N-type MOS tube as a high-side control device, and have the characteristics of lower on-resistance and lower cost.
In the traditional lithium battery protection method, a charge pump is adopted to take electricity from the positive end of a lithium battery, and the electricity is provided to the grids of a charge protection transistor and a discharge protection transistor after being boosted, so that the control of the charge protection transistor and the discharge protection transistor is realized. 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 through a voltage detection circuit to ensure that the charge protection transistor and the discharge protection transistor maintain a stable conduction state.
Because the voltage of the charging protection transistor and the voltage of the discharging protection transistor need to be detected in real time, the voltage detection circuit generates static power consumption, and the boosting 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 aim to solve the problem that the static power consumption of the voltage detection circuit is too high.
A voltage detection circuit comprises a resistance voltage division detection branch circuit, a capacitance voltage division detection branch circuit and a logic processing circuit;
the logic processing circuit is connected with the resistance voltage division detection branch circuit and the capacitance voltage division detection branch circuit, and is used for sending a first modulation signal to the resistance voltage division detection branch circuit and sending a second modulation signal to the capacitance voltage division detection branch circuit;
the resistance voltage division detection branch circuit 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 capacitance voltage division detection branch circuit 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 capacitance voltage division detection branch is also connected with a battery voltage input end and 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 configured to send a third modulation signal to the resistance voltage division detection branch according to the abnormality detection signal;
the resistance voltage division detection branch circuit is further configured to process the driving voltage input by the driving voltage input end according to a third modulation signal, and output a third detection signal to the logic processing circuit;
and the logic processing circuit is also used for outputting a voltage detection signal according to the third detection signal.
Further, the resistance voltage division detection branch comprises a resistance voltage division circuit and a first signal comparison circuit;
the first end of the resistance voltage division circuit is connected with the first output end of the logic processing circuit, the second end of the resistance voltage division circuit is connected with the driving voltage input end, the third end of the resistance voltage division 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 resistance voltage division 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 capacitance voltage division detection branch comprises a capacitance voltage division circuit and a second signal comparison circuit;
the first end of the capacitance voltage division circuit is connected with the second output end of the logic processing circuit, the second end of the capacitance voltage division circuit is connected with the voltage input end of the battery, the third end of the capacitance voltage division circuit is connected with the driving voltage input end, the fourth end of the capacitance voltage division 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 voltage input end of the battery, and the output end of the second signal comparison circuit is connected with the second input end of the logic processing circuit.
Further, the capacitance 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 resistance voltage division detection branch circuit, the second input end of the logic processor is connected with the capacitance voltage division detection branch circuit, 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 terminal of the logic processor.
Further, the oscillator is a low frequency oscillator.
A battery protection circuit comprises a driving circuit, a booster circuit, a logic judgment circuit and the voltage detection circuit;
the logic judgment circuit is connected with the voltage detection circuit, the drive circuit and the booster circuit and is used for outputting a first control signal to the drive circuit and the booster circuit;
the boosting circuit is connected with the driving circuit and used for outputting boosting voltage according to the first control signal;
the driving circuit is connected with a driving voltage input end of the voltage detection circuit and used for outputting the driving voltage to the driving voltage input end according to the first control signal and the boosting 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 resistance voltage division detection branch circuit, a capacitance voltage division detection branch circuit and a logic processing circuit. In this embodiment, the logic processing circuit is connected to the resistance voltage division detection branch and the capacitance voltage division detection branch, and is configured to send a first modulation signal to the resistance voltage division detection branch and send a second modulation signal to the capacitance voltage division detection branch. And the resistance voltage division detection branch circuit 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 capacitance voltage division detection branch circuit is connected with the driving voltage input end and the logic processing circuit and 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; and the logic processing circuit outputs a voltage detection signal according to the first detection signal or the second detection signal, combines the modes of resistance detection and capacitance detection, 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 needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a circuit diagram of a voltage detection circuit according to an embodiment of the present invention;
FIG. 2 is another circuit diagram of the voltage detection circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a battery protection system according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a battery protection circuit according to an embodiment of the invention.
In the figure: 10. a resistance voltage division detection branch circuit; 11. a resistance voltage-dividing circuit; 12. a first signal comparison circuit; 20. a capacitance voltage division detection branch; 21. a capacitive voltage divider circuit; 22. a second signal comparison circuit; 30. a logic processing circuit; 31. a logical processor; 32. an oscillator; 41. a battery protection circuit; 51. a signal detection circuit; 52. a logic judgment circuit; 53. a boost circuit; 54. a drive circuit; 55. a voltage detection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be understood that the present invention may be embodied in many different 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 size and relative sizes of layers and regions may be exaggerated for clarity to indicate like elements throughout.
It will be understood that when an element or layer is referred to as being "on" …, "adjacent to …," "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to the other elements or layers 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" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used 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.
Spatial relationship terms such as "under …", "under …", "below", "under …", "above …", "above", and the like, may be used herein for ease of description to describe the relationship of one element or feature 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 or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" can encompass both an orientation of up and down. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial 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 purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The present embodiment provides a voltage detection circuit 55, as shown in fig. 1, including a resistance voltage division detection branch 10, a capacitance voltage division detection branch 20, and a logic processing circuit 30; the logic processing circuit 30 is connected to the resistance voltage division detection branch 10 and the capacitance voltage division detection branch 20, and is configured to send a first modulation signal to the resistance voltage division detection branch 10 and send a second modulation signal to the capacitance voltage division detection branch 20; the resistance 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 the first modulation signal and outputting a first detection signal to the logic processing circuit 30; the capacitance voltage division detection branch circuit 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 the 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 a 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 pole 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 pole of the lithium battery is connected to the ground terminal and the negative voltage 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 positive voltage terminal and the peak voltage input 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 value 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 value input terminal VM, and output a logic signal. A logic judgment circuit 52 connected to the voltage detection circuit 55, the drive circuit 54 and the voltage boost circuit 53, for outputting a first control signal to the drive circuit 54 and the voltage boost circuit 53 according to the logic signal; a boost circuit 53 connected to the drive circuit 54 for outputting a boost voltage according to a first control signal; a drive circuit 54 connected to the drive voltage input terminal DIN of the voltage detection circuit 55, for outputting a drive voltage to the drive voltage input terminal DIN in accordance with the first control signal and the boosted voltage; the output end of the voltage detection circuit 55 is connected to the logic judgment circuit 52 and the voltage boost circuit 53, and is used for acquiring the driving voltage and outputting the voltage detection signal to the logic judgment circuit 52 and the voltage boost circuit 53.
As an example, the voltage detection circuit 55 includes a resistance division detection branch 10, a capacitance division detection branch 20, and a logic processing circuit 30. In this example, the voltage detection circuit 55 may perform time-sharing control on the resistance voltage division detection branch and the capacitance voltage division detection branch 20 through the logic processing circuit 30, so as to reduce static loss generated by the resistance voltage division detection branch 10 under a high driving voltage.
As an example, the logic processing circuit 30 is connected to the resistance voltage division detecting branch 10 and the capacitance voltage division detecting branch 20, and is configured to send a first modulation signal to the resistance voltage division detecting branch 10 and send a second modulation signal to the capacitance voltage division detecting branch 20. Optionally, the first modulation signal and the second modulation signal are PWM (Pulse width modulation, PWM for short) signals. Illustratively, the high level or low level time of the first modulation signal and the second modulation signal can be set according to actual requirements. Preferably, the first modulation signal and the second modulation signal have opposite levels at the same time to realize time-sharing control.
As another example, the resistance division detection 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, when the charge protection transistor M1 or the discharge protection transistor M2 is in the on mode, the driving circuit 54 outputs a driving voltage to the charge protection transistor M1 or the discharge protection transistor M2 and the driving voltage input terminal DIN, and after the resistance voltage division detecting branch 10 receives the first modulation signal, the resistance voltage division detecting branch 10 is turned on, and 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, and if the driving voltage is detected by the resistance voltage division detection branch circuit 10 for a long time, a large loss is generated, so that in this example, the resistance voltage division detection branch circuit 10 is controlled by the first modulation signal, the driving voltage is prevented from being detected by the resistance voltage division detection branch circuit 10 for a long time, and the static power consumption of the voltage detection circuit 55 is reduced.
As another example, the capacitive division detection 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 resistance voltage division detecting branch 10 to stop operating, for example, when the first modulation signal is at a low level, the resistance voltage division detecting branch 10 stops operating, and at this time, the capacitance voltage division detecting branch 20 receives the second modulation signal, which is at a high level, and controls the capacitance voltage division detecting branch 20 to be turned on, processes the driving voltage input by 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 to detect 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 configured reasonably according to actual requirements, so that the logic processing circuit 30 controls the resistance voltage division detection circuit 10 and the capacitance 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 resistance voltage division detection branch 10, a capacitance voltage division detection branch 20 and a logic processing circuit 30. In this embodiment, the logic processing circuit 30 is connected to the resistance voltage division detecting branch 10 and the capacitance voltage division detecting branch 20, and is configured to send a first modulation signal to the resistance voltage division detecting branch 10 and send a second modulation signal to the capacitance voltage division detecting branch 20. The resistance division detection 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. The capacitance 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 the 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 the capacitance detection to realize accurate driving voltage detection and reduce the low power consumption of the voltage detection circuit 55.
In an embodiment, as shown in fig. 2, the capacitance 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 resistance voltage division detection branch 10 according to the abnormality detection signal; the resistance voltage division detection branch 10 is further configured to process the driving voltage input by the driving voltage input end 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 capacitance division detection branch 20 is further 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 and obtaining the battery voltage of the lithium battery. When the battery voltage input from the battery voltage input terminal VDD is abnormal, the capacitance division detection branch 20 sends an abnormality detection signal to the logic processing circuit 30.
As another example, the logic processing circuit 30 sends a third modulation signal to the resistance voltage division detecting branch 10 according to the abnormality detection signal, and after receiving the third modulation signal, the resistance voltage division detecting branch 10 processes the driving voltage input from the driving voltage input terminal DIN according to the third modulation signal, and outputs the third detection signal to the logic processing circuit 30, and the logic processing circuit 30 outputs the voltage detection signal according to 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 leaks or the battery voltage changes, the capacitance 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 opening of the resistance voltage division detection branch 10, and outputs a voltage detection signal to the logic determination circuit 52 in the above embodiment, the logic determination circuit 52 accelerates the voltage boosting capability of the voltage boosting circuit 53, and timely supplements the power to the driving circuit 54 of the charge protection transistor M1 or the discharge protection transistor M2, and after completing the power supplementation, the capacitance voltage division detection branch 20 is made to work again, and the resistance voltage division detection branch 10 is turned off, so that the voltage detection circuit 55 enters the low power consumption mode.
In the present embodiment, by connecting the capacitor voltage division detecting branch 20 to the battery voltage input terminal VDD, the capacitor voltage division detecting branch 20 can send an abnormal detection signal to the logic processing circuit 30 when the battery voltage input from the battery voltage input terminal VDD is abnormal, so that the logic processing circuit 30 sends a third modulation signal to the resistor voltage division detecting branch 10 according to the abnormal detection signal, so that the resistor voltage division detecting branch 10 processes the driving voltage input from the driving voltage input terminal DIN according to the third modulation signal, outputs the third detection signal to the logic processing circuit 30, and finally, causes the logic processing circuit 30 to output a voltage detection signal according to the third detection signal, so that when the Vgs (voltage between the source and the gate) voltage of the charge protection transistor M1 or the discharge protection transistor M2 leaks or the battery voltage changes, the drive circuit 54 of the charge protection transistor M1 or the discharge protection transistor M2 is timely replenished with electricity, so that the reliability of the battery protection circuit 41 is improved, and the power consumption of the voltage detection circuit 55 is reduced.
In one embodiment, as shown in fig. 2, the resistance voltage division detection branch circuit 10 includes a resistance voltage division circuit 11 and a first signal comparison circuit 12; the first end of the resistance voltage division circuit 11 is connected with the first output end of the logic processing circuit 30, the second end of the resistance voltage division circuit 11 is connected with the driving voltage input end DIN, the third end of the resistance voltage division circuit 11 is connected with the first input end of 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 the output end of the first signal comparison circuit 12 is connected with 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 resistance voltage divider circuit 11 is connected to the driving voltage input terminal DIN for receiving the driving voltage, and a third terminal of the resistance voltage divider circuit 11 is connected to the first input terminal of the first signal comparator circuit 12 for inputting the divided driving voltage to the first signal comparator circuit 12. The second input terminal of the first signal comparing circuit 12 is a first reference voltage input terminal, and is configured to receive a first reference voltage, and the output terminal of the first signal comparing circuit 12 is connected to the first input terminal of the logic processing circuit 30, and is configured to compare the driving voltage after voltage division processing with the first reference voltage, and output a first detection signal to the logic processing circuit 30, thereby implementing driving voltage detection in a resistance voltage division detection manner.
Optionally, the first signal comparing circuit 12 includes a first comparator, a first input terminal of the first comparator is connected to the third terminal of the resistance voltage divider circuit 11, a second input terminal of the first comparator is a first reference voltage input terminal, and an output terminal of the first comparator is connected to the first input terminal of the logic processing circuit 30.
In the present embodiment, the resistance voltage division detection branch circuit 10 includes a resistance voltage division circuit 11 and a first signal comparison circuit 12. In this embodiment, the first end of the resistance voltage divider circuit 11 is connected to the first output end of the logic processing circuit 30, the second end of the resistance voltage divider circuit 11 is connected to the driving voltage input end DIN, the third end of the resistance voltage divider circuit 11 is connected to the first input end of the first signal comparator circuit 12, the second input end of the first signal comparator circuit 12 is the first reference voltage input end, the output end of the first signal comparator circuit 12 is connected to the first input end of the logic processing circuit 30, and the driving voltage detection in the resistance voltage division detection mode can be realized.
In one embodiment, as shown in fig. 2, the resistance voltage divider circuit 11 includes a first transistor M11, a first resistor R11, and a second resistor R12; a first terminal of the first transistor M11 is connected to the first output terminal of the logic processing circuit 30, a second terminal of the first transistor M11 is connected to the first terminal of the first resistor R11, a third terminal of the first transistor M11 is connected to the first terminal of the second resistor R12 and the first input terminal of the first signal comparing circuit 12, a second terminal of the first resistor R11 is connected to the driving voltage input terminal DIN, and a second terminal of the second resistor R12 is grounded.
Preferably, the first transistor M11 is a MOS transistor, the first terminal of the first transistor M11 is a gate, the second terminal of the first transistor M11 is a source, and the third terminal of the first transistor M11 is a drain.
As an example, the first terminal of the first transistor M11 is connected to the first output terminal of the logic processing circuit 30, and is used for receiving the first modulation signal output by the logic processing circuit 30. A second terminal of the first transistor M11 is connected to the first terminal of the first resistor R11, a third terminal of the first transistor M11 is connected to the first terminal of the second resistor R12 and the first input terminal of the first signal comparing circuit 12, a second terminal of the first resistor R11 is connected to the driving voltage input terminal DIN, and a second terminal 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 comparing circuit 12. The first signal comparison circuit 12 compares the divided driving voltage with the first reference voltage, and outputs a first detection signal to the logic processing circuit 30, thereby implementing the driving voltage detection in the resistance voltage division detection manner.
In the present embodiment, the resistance voltage dividing circuit 11 includes a first transistor M11, a first resistor R11, and a second resistor R12. In this embodiment, the first terminal of the first transistor M11 is connected to the first output terminal of the logic processing circuit 30, the second terminal of the first transistor M11 is connected to the first terminal of the first resistor R11, the third terminal of the first transistor M11 is connected to the first terminal of the second resistor R12 and the first input terminal of the first signal comparing circuit 12, the second terminal of the first resistor R11 is connected to the driving voltage input terminal DIN, and the second terminal of the second resistor R12 is grounded, so that the driving voltage detection in the resistor voltage division detection manner can be realized.
In one embodiment, as shown in fig. 2, the capacitive voltage division detection branch 20 includes a capacitive voltage division circuit 21 and a second signal comparison circuit 22; the first end of the capacitor voltage dividing circuit 21 is connected with the second output end of the logic processing circuit 30, the second end of the capacitor voltage dividing circuit 21 is connected with the battery voltage input end VDD, the third end of the capacitor voltage dividing circuit 21 is connected with the driving voltage input end DIN, the fourth end of the capacitor voltage dividing circuit 21 is connected with the first input end of the second signal comparison circuit 22, the second input end of the second signal comparison circuit 22 is connected with the battery voltage input end VDD, and the output end of the second signal comparison circuit 22 is connected with the second input end of the logic processing circuit 30.
As an example, a first terminal of the capacitor voltage divider circuit 21 is connected to the second output terminal of the logic processing circuit 30 for receiving the second modulation signal output by the logic processing circuit 30, a second terminal of the capacitor voltage divider circuit 21 is connected to the battery voltage input terminal VDD for receiving the battery voltage, a third terminal of the capacitor voltage divider circuit 21 is connected to the driving voltage input terminal DIN for receiving the driving voltage, a fourth terminal of the capacitor voltage divider circuit 21 is connected to the first input terminal of the second signal comparison circuit 22, when it is detected that the battery voltage input by the battery voltage input terminal VDD is not abnormal, the capacitor voltage divider circuit 21 divides the driving voltage, and sends the divided driving voltage to the first input terminal of the second signal comparison circuit 22. When there is an abnormality in the battery voltage input from the battery voltage input terminal VDD, the capacitance voltage divider circuit 21 transmits the abnormal battery voltage to the second signal comparator circuit 22. A second input terminal of the second signal comparing circuit 22 is connected to the battery voltage input terminal VDD, an output terminal of the second signal comparing circuit 22 is connected to a 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 a second detection signal is output to the logic processing circuit 30. If the first input terminal of the second signal comparing 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 comparing 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 method can be realized.
In the present embodiment, the capacitance division detection branch 20 includes a capacitance division circuit 21 and a second signal comparison circuit 22. In this embodiment, the first end of the capacitor voltage dividing circuit 21 is connected to the second output end of the logic processing circuit 30, the second end of the capacitor voltage dividing circuit 21 is connected to the battery voltage input end VDD, the third end of the capacitor voltage dividing circuit 21 is connected to the driving voltage input end DIN, the fourth end of the capacitor 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 of the capacitor voltage dividing detection mode can be realized.
In one embodiment, as shown in fig. 2, the capacitance voltage divider circuit 21 includes a second transistor M21, a first capacitor C21, and a second capacitor C22; a first terminal of the second transistor M21 is connected to the second output terminal of the logic processing circuit 30, a second terminal of the second transistor M21 is connected to the battery voltage input terminal VDD, a third terminal of the second transistor M21 is connected to the first terminal of the first capacitor C21, the first terminal of the second capacitor C22 and the first input terminal of the second signal comparing circuit 22, a second terminal of the first capacitor C21 is connected to the driving voltage input terminal DIN, and a second terminal of the second capacitor C22 is grounded.
Preferably, the second transistor M21 is a MOS transistor, the first terminal of the first transistor M11 is a gate, the second terminal of the second transistor M21 is a source, and the third terminal of the first transistor M11 is a drain.
As an example, the first terminal of the second transistor M21 is connected to the second output terminal of the logic processing circuit 30 for receiving the second modulation signal output by the logic processing circuit 30, the second terminal of the second transistor M21 is connected to the battery voltage input terminal VDD for receiving the battery voltage, the third terminal of the second transistor M21 is connected to the first terminal of the first capacitor C21, the first terminal of the second capacitor C22 and the first input terminal of the second signal comparing circuit 22, the second terminal of the first capacitor C21 is connected to the driving voltage input terminal DIN, the second terminal of the second capacitor C22 is grounded, when the first terminal of the second transistor M21 receives the second modulation signal, the second transistor M21 is turned on to divide the driving voltage and input the divided driving voltage to the first input terminal of the second signal comparing circuit 22, the second signal comparing circuit 22 compares the divided driving voltage with the battery voltage, outputting a 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 the battery voltage received by the battery voltage input terminal VDD connected to the second end of the second transistor M21 is abnormal, the second signal comparison circuit 22 compares the abnormal battery voltage with the battery voltage received by the second input terminal of the second signal comparison circuit 22, and outputs an abnormal detection signal, so that the driving voltage detection in the capacitance voltage division detection mode can be realized.
In the present embodiment, the capacitance voltage dividing circuit 21 includes a second transistor M21, a first capacitor C21, and a second capacitor C22. In the present embodiment, the first terminal of the second transistor M21 is connected to the second output terminal of the logic processing circuit 30, the second terminal of the second transistor M21 is connected to the battery voltage input terminal VDD, the third terminal of the second transistor M21 is connected to the first terminal of the first capacitor C21, the first terminal of the second capacitor C22 and the first input terminal of the second signal comparing circuit 22, the second terminal of the first capacitor C21 is connected to the driving voltage input terminal DIN, and the second terminal of the second capacitor C22 is grounded, so that the driving voltage detection in the capacitor 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 resistance voltage division detection branch 10, a second input terminal of the logic processor 31 is connected to the capacitance voltage division detection branch 20, a first output terminal of the logic processor 31 is configured to output a first modulation signal, and a second output terminal of the logic processor 31 is configured to output a second modulation signal.
In this embodiment, the logic processing circuit 30 includes a logic processor 31, a first input terminal of the logic processor 31 is connected to the resistance voltage division detecting branch 10, a second input terminal of the logic processor 31 is connected to the capacitance voltage division detecting branch 20, a first output terminal of the logic processor 31 is configured to output a first modulation signal, and a second output terminal of the logic processor 31 is configured to output a second modulation signal, so as to implement time-sharing control over the resistance voltage division detecting branch 10 and the capacitance voltage division detecting branch 20, and reduce loss of the voltage detecting circuit 55.
In one embodiment, as shown in FIG. 2, the logic processing circuit 30 further includes an oscillator 32; an 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; an oscillator 32 is connected to a third input of the logic processor 31 for causing the logic processor 31 to generate the first modulation signal and the second modulation signal.
In one embodiment, 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 determination circuit 52, and the above-mentioned voltage detection circuit 55; a logic judgment circuit 52 connected to the voltage detection circuit 55, the drive circuit 54 and the voltage boost circuit 53, for outputting a first control signal to the drive circuit 54 and the voltage boost circuit 53; a boost circuit 53 connected to the drive circuit 54 for outputting a boost voltage according to a first control signal; a drive circuit 54 connected to a drive voltage input terminal DIN of the voltage detection circuit 55, for outputting a drive voltage to the drive circuit 54 in accordance with the first control signal and the boosted voltage; the output end of the voltage detection circuit 55 is connected to the logic judgment circuit 52 and the voltage boost circuit 53, and is used for acquiring the driving voltage and outputting the voltage detection signal to the logic judgment circuit 52 and the voltage boost circuit 53.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A voltage detection circuit is characterized by comprising a resistance voltage division detection branch circuit, a capacitance voltage division detection branch circuit and a logic processing circuit;
the logic processing circuit is connected with the resistance voltage division detection branch circuit and the capacitance voltage division detection branch circuit, and is used for sending a first modulation signal to the resistance voltage division detection branch circuit and sending a second modulation signal to the capacitance voltage division detection branch circuit;
the resistance voltage division detection branch circuit 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 capacitance voltage division detection branch circuit 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.
2. The voltage detection circuit of claim 1, wherein the capacitive voltage division detection branch is further connected to a battery voltage input terminal, and configured to send an abnormality detection signal to the logic processing circuit when there is an abnormality in the battery voltage input at the battery voltage input terminal;
the logic processing circuit is further configured to send a third modulation signal to the resistance voltage division detection branch according to the abnormality detection signal;
the resistance voltage division detection branch circuit is further configured to process the driving voltage input by the driving voltage input end according to a third modulation signal, and output a third detection signal to the logic processing circuit;
and the logic processing circuit is also used for outputting a voltage detection signal according to the third detection signal.
3. 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 resistance voltage division circuit is connected with the first output end of the logic processing circuit, the second end of the resistance voltage division circuit is connected with the driving voltage input end, the third end of the resistance voltage division 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.
4. The voltage detection circuit of claim 3, wherein the resistance voltage divider circuit comprises a first transistor, a first resistance, and a second resistance;
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.
5. 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 capacitance voltage division circuit is connected with the second output end of the logic processing circuit, the second end of the capacitance voltage division circuit is connected with the battery voltage input end, the third end of the capacitance voltage division circuit is connected with the driving voltage input end, the fourth end of the capacitance voltage division 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.
6. The voltage detection circuit of claim 5, wherein the capacitance divider circuit comprises a second transistor, a first capacitance, and a second capacitance;
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.
7. 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 resistance voltage division detection branch circuit, the second input end of the logic processor is connected with the capacitance voltage division detection branch circuit, 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.
8. The voltage detection circuit of claim 7, wherein the logic processing circuit further comprises an oscillator; the oscillator is connected to a third input terminal of the logic processor.
9. The voltage detection circuit of claim 8, wherein the oscillator is a low frequency oscillator.
10. A battery protection circuit comprising a drive circuit, a booster circuit, a logic judgment circuit, and a voltage detection circuit according to any one of claims 1 to 9;
the logic judgment circuit is connected with the voltage detection circuit, the drive circuit and the booster circuit and is used for outputting a first control signal to the drive circuit and the booster circuit;
the boosting circuit is connected with the driving circuit and used for outputting boosting voltage according to the first control signal;
the driving circuit is connected with a driving voltage input end of the voltage detection circuit and used for outputting the driving voltage to the driving voltage input end according to the first control signal and the boosting 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115963429A (en) * | 2023-03-16 | 2023-04-14 | 山东云开电力有限公司 | Electric leakage detection device for power switch cabinet |
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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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| 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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