Dead battery detection circuit, chip and electronic equipment
By introducing a drive control module into the dead battery detection circuit and adjusting the time difference between the detection module and the switching module, the overshoot voltage problem at the power supply end is solved, ensuring circuit stability and avoiding damage to the low-voltage circuit.
Patent Information
- Application Number
- CN202422560549.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-10-22
AI Technical Summary
In a dead battery detection circuit, configuring a switch in the channel between the power supply and the power receiving end may cause overshoot voltage, damaging the subsequent low-voltage circuit.
By introducing a control terminal connection between the drive control module and the detection module, the time between the off time of the detection module and the on time of the switch module is shortened according to the channel enable signal and the dead battery detection enable signal, so that the current flows through the turned-on switch module instead of the detection module, avoiding the occurrence of excessively high potential.
It effectively reduces the duration of excessively high potential at the connection port of the detection module, avoids damage to the subsequent low-voltage circuit, and ensures stable operation of the circuit.
Smart Images
Figure CN223461675U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electronic circuit, in particular to a dead battery detection circuit, a chip and an electronic device. BACKGROUND
[0002] In the dead battery detection circuit, a channel configuration (CC) switch is usually connected between the power supply end (SOURCE) and the power receiving end (SINK) as a protection switch.
[0003] However, the port connected with the power supply end may appear an overshoot voltage, thereby damaging the low-voltage circuit in the rear stage. CONTENT OF THE INVENTION
[0004] The embodiments of the present application provide a dead battery detection circuit, a chip and an electronic device to alleviate the technical problem of the port connected with the power supply end appearing an excessively high potential.
[0005] In a first aspect, the embodiments of the present application provide a dead battery detection circuit, which comprises a switch module, a detection module and a driving control module, the switch module is configured to control the connection state between a first port and a second port according to a channel enable signal; the detection module is connected with the first port and the switch module; the driving control module is connected with the control end of the detection module, and is configured to reduce the time length between the closing time of the dead battery detection function of the detection module and the conduction time of the switch module according to the channel enable signal and a dead battery detection enable signal.
[0006] In a second aspect, the embodiments of the present application further provide a chip, which comprises the above dead battery detection circuit.
[0007] In a third aspect, the embodiments of the present application further provide an electronic device, which comprises a device main body and the above dead battery detection circuit or chip arranged on the device main body.
[0008] The dead battery detection circuit, the chip and the electronic device provided by the embodiments of the present application have the following advantages: the driving control module is connected with the control end of the detection module, and is configured to reduce the time length between the closing time of the dead battery detection function of the detection module and the conduction time of the switch module according to the channel enable signal and the dead battery detection enable signal; due to the shortening of the time length between the closing time of the dead battery detection function of the detection module and the conduction time of the switch module, the current provided by the power supply end flows through the conduction switch module instead of the detection module during the switching period from the opening to the closing of the dead battery detection function, thereby reducing the time length of the first port connected with the detection module appearing an excessively high potential, and further alleviating the technical problem of the port connected with the power supply end appearing an excessively high potential, and being also conducive to avoiding damaging the low-voltage circuit in the rear stage.
[0009] These aspects or other aspects of the present application will be made clearer in the following description of embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.
[0011] Figure 1 A principle block diagram of a dead battery detection circuit provided by an embodiment of the present application is shown.
[0012] Figure 2 A principle block diagram of a drive control module is shown.
[0013] Figure 3 A circuit principle diagram of a logic unit is shown.
[0014] Figure 4 A circuit principle diagram of a switch module is shown.
[0015] Figure 5 A first principle block diagram of a detection module is shown.
[0016] Figure 6 A circuit principle diagram of a second impedance unit is shown.
[0017] Figure 7 A second principle block diagram of a detection module is shown.
[0018] Figure 8 A circuit principle diagram of a first clamping unit is shown.
[0019] Figure 9 A third principle block diagram of a detection module is shown.
[0020] Figure 10 A circuit principle diagram of a second clamping unit is shown.
[0021] Figure 11 A circuit principle diagram of a dead battery detection circuit provided by an embodiment of the present application is shown.
[0022] Figure 12 A schematic diagram of a chip provided by an embodiment of the present application is shown.
[0023] Figure 13 A schematic diagram of an electronic device provided by an embodiment of the present application is shown. DETAILED DESCRIPTION
[0024] The embodiments of the present application will be described below in detail with reference to the accompanying drawings. The embodiments described below are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application.
[0025] In order to make the persons skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the present application.
[0026] It should be noted that in the embodiments of the present application, in this document, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations.
[0027] Moreover, the term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes the elements inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.
[0028] In the description of the embodiments of the present application, the words "example" or "for example" are used to mean example, illustration or description. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The words "example" or "for example" are intended to present the relative concept in a clear manner.
[0029] In addition, "a plurality of" in the embodiments of the present application means two or more, and in view of this, "a plurality of" in the embodiments of the present application can also be understood as "at least two". "At least one" can be understood as one or more, for example, as one, two or more. For example, including at least one means including one, two or more, and does not limit which ones are included, for example, including at least one of A, B and C, then the included can be A, B, C, A and B, A and C, B and C, or A and B and C.
[0030] It should be noted that the "connection" in the embodiments of the present application can be understood as an electrical connection, and the connection between two electrical elements can be direct or indirect connection between the two electrical elements. For example, A and B are connected, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements.
[0031] The first pole / first end of each transistor in the embodiments of the present application is one of the source and the drain, and the second pole / second end of each transistor is the other of the source and the drain. Since the source and the drain of the transistor can be symmetrical in structure, the source and the drain can be indistinguishable in structure, that is, the first pole / first end and the second pole / second end of the transistor in the embodiments of the present application can be indistinguishable in structure. Illustratively, in the case of a P-type transistor, the first pole / first end of the transistor is the source and the second pole / second end of the transistor is the drain; illustratively, in the case of an N-type transistor, the first pole / first end of the transistor is the drain and the second pole / second end of the transistor is the source.
[0032] In the circuit structure provided by the embodiments of the present application, the nodes such as the first node and the second node are not actual components, but represent the convergence points of relevant couplings in the circuit diagram, that is, these nodes are nodes equivalent to the convergence points of relevant couplings in the circuit diagram.
[0033] In the USB Type-C PD application, the CC port is mainly responsible for PD communication, and is used to determine the positive and negative insertion of the device, the handshake between devices, etc. When the battery of the system is out of power, the PD chip needs to take power from the VBUS port of the Type-C as the SOURCE side, at which time the "dead battery" state will be entered. If the Type-C on the SOURCE side does not detect the PD chip as a SINK, the VBUS cannot be supplied to the PD chip.
[0034] Therefore, in order to eliminate this "dead battery" state, the PD chip needs a detection resistance (according to the PD protocol, the resistance is about 5.1k) at the CC port as a SINK for dead battery detection before the VBUS voltage is provided on the SOURCE side, so that the Type-C on the SOURCE side can identify the PD chip as a SINK. When the PD chip no longer needs to take power from the VBUS, the function of this resistance can be cancelled by the PD MCU on the SINK side.
[0035] As Figure 1As shown, an embodiment of the present application provides a dead battery detection circuit 100, which includes a switch module 10, a detection module 20 and a drive control module 30. The drive control module 30 is connected to the control end of the detection module 20, and the drive control module 30 is used to reduce the time between the off time of the dead battery detection function of the detection module 20 and the on time of the switch module 10 according to the channel enable signal CC_EN and the dead battery detection enable signal DB_ENB. Due to the shortening of the time between the off time of the dead battery detection function of the detection module 20 and the on time of the switch module 10, during the switching period from on to off of the dead battery detection function, the current provided by the power supply end flows through the turned-on switch module 10 instead of the detection module 20, thereby reducing the time when the first port B1 connected to the detection module 20 has an excessively high potential, thereby alleviating the technical problem of excessively high potential occurring at the port connected to the power supply end.
[0036] This embodiment of the present application provides a dead battery detection circuit 100, see Figures 1 to 11 ,like Figure 1 As shown, the dead battery detection circuit 100 includes a switch module 10, a detection module 20 and a drive control module 30. The switch module 10 is used to control the connection state between the first port B1 and the second port B2 according to the channel enable signal CC_EN; the detection module 20 is connected to the first port B1 and the switch module 10; the drive control module 30 is connected to the control end of the detection module 20, and the drive control module 30 is used to reduce the duration between the off time of the dead battery detection function of the detection module 20 and the on time of the switch module 10 according to the channel enable signal CC_EN and the dead battery detection enable signal DB_ENB.
[0037] It can be understood that the dead battery detection circuit 100 provided in the embodiment of the present application is connected to the control end of the detection module 20 through the drive control module 30. The drive control module 30 is used to reduce the time between the off time of the dead battery detection function of the detection module 20 and the on time of the switch module 10 according to the channel enable signal CC_EN and the dead battery detection enable signal DB_ENB. Due to the shortening of the time between the off time of the dead battery detection function of the detection module 20 and the on time of the switch module 10, during the switching period from on to off of the dead battery detection function, the current provided by the power supply end flows through the turned-on switch module 10 instead of the detection module 20, thereby reducing the time when the first port B1 connected to the detection module 20 has an excessively high potential, thereby alleviating the technical problem of the excessively high potential at the port connected to the power supply end, and is also beneficial to avoid damage to the low-voltage circuit of the subsequent stage.
[0038] It should be noted that by adjusting the time length between the closing time of the dead battery detection function and the on time of the switch module 10, the time length of the over-high potential of the first port B1 can be adjusted in the same direction. For example, as the time length decreases, the time length of the over-high potential of the first port B1 also decreases until there is no over-high potential.
[0039] The CC_IN can be the intersection node of the first port B1 and the detection module 20 and the switch module 10. The CC_OUT can be the intersection node of the second port B2 and the switch module 10.
[0040] In some embodiments, as shown in Figure 2 The driving control module 30 includes a delay unit 31 and a logic unit 32. The input end of the delay unit 31 is used to access the channel enable signal CC_EN. The first input end of the logic unit 32 is connected with the output end of the delay unit 31. The second input end of the logic unit 32 is used to access the dead battery detection enable signal DB_ENB. The output end of the logic unit 32 is connected with the control end of the detection module 20. The logic unit 32 is used to delay the time length between the opening and closing of the dead battery detection function.
[0041] It should be noted that the delay unit 31 is used to delay the phase of the channel enable signal CC_EN. For example, the high potential of the channel enable signal CC_EN appears from the first time to the second time, and the first time is earlier than the second time.
[0042] Before the driving control module 30 is added, the time length between the opening and closing of the dead battery detection function is shorter than the on time of the switch module 10. This makes the switch module 10 turn on after the dead battery detection function is closed. The current from the power supply end all flows into the detection module 20, so that there is an over-high potential at CC_IN for a period of time.
[0043] After the driving control module 30 is added, by delaying the time length between the opening and closing of the dead battery detection function, the time difference between the closing time of the dead battery detection function and the on time of the switch module 10 can be shortened. The closing time of the dead battery detection function and the on time of the switch module 10 tend to be synchronized, so that the current from the power supply end flows out from the switch module 10, so that there is no over-high potential at CC_IN.
[0044] In some embodiments, as shown in Figure 3 The logic unit 32 includes an AND gate AND1. The first input end of the AND gate AND1 is connected with the output end of the delay unit 31. The second input end of the AND gate AND1 is used to access the dead battery detection enable signal DB_ENB. The output end of the AND gate AND1 is connected with the control end of the detection module 20.
[0045] It should be noted that the high level of the dead battery detection enable signal DB ENB is earlier than the high level of the delayed channel enable signal CC EN, and the AND gate AND1 performs AND logic operation on the dead battery detection enable signal DB ENB and the delayed channel enable signal CC EN, so that the AND logic operation result of the high level is output when the dead battery detection enable signal DB ENB and the delayed channel enable signal CC EN are at the high level at the same time, so as to delay the closing of the dead battery detection function, and make the closing time of the dead battery detection function consistent with the conduction time of the switch module.
[0046] In some embodiments, as shown in Figure 4 The switch module 10 includes a first transistor M3 and a charge pump 11. The first pole of the first transistor M3 is connected with the first port B1 and the detection module 20, and the second pole of the first transistor M3 is connected with the second port B2. The input end of the charge pump 11 is used to access the driving voltage, the enable end of the charge pump 11 is used to access the channel enable signal CC EN, and the output end of the charge pump 11 is connected with the control pole of the first transistor M3. The output voltage build-up time of the charge pump 11 is the same as the delay time of the delay unit 31.
[0047] It should be noted that when the channel enable signal CC EN is switched to the high level, the charge pump 11 starts to work. Under the supply of the input voltage (VIN), the output voltage of the charge pump 11 needs a build-up time to rise from the low level to the high level, which will cause the first transistor M3 to be delayed to be turned on. The charge pump 11 can be a double voltage charge pump 11 to provide driving capability for the first transistor M3.
[0048] The output voltage build-up time of the charge pump 11 is the same as the delay time of the delay unit 31, so that the conduction time of the first transistor M3 is at the same time as the closing time of the dead battery detection function, so that the current flows through the first transistor M3 when the dead battery detection function is closed, and does not flow through the detection module 20, because the resistance of the branch where the first transistor M3 is located is much smaller than the resistance of the branch where the detection module 20 is located.
[0049] In some embodiments, as shown in Figure 5As shown, the detection module 20 includes a first impedance unit 21, a first switch unit 22, a second impedance unit 23 and a second switch unit 24. The first end of the first impedance unit 21 is connected to the first port B1 and the first electrode of the first transistor M3; the first end of the first switch unit 22 is connected to the second end of the first impedance unit 21, the second end of the first switch unit 22 is connected to the ground terminal GND, and the control end of the first switch unit 22 is connected to the output end of the AND gate AND1; the first end of the second impedance unit 23 is connected to the first port B1; the first end of the second switch unit 24 is connected to the second end of the second impedance unit 23, the second end of the second switch unit 24 is connected to the ground terminal GND, and the control end of the second switch unit 24 is connected to the first end of the first switch unit 22 and the second end of the first impedance unit 21.
[0050] It should be noted that turning off the dead battery detection function means that the first switch unit 22 is in the on state and the second switch unit 24 is in the off state, so that the second impedance unit 23 is not connected to CC_IN. Turning on the dead battery detection function means that the first switch unit 22 is in the off state and the second switch unit 24 is in the on state, so that the second impedance unit 23 is connected between CC_IN and the ground terminal GND, so that the second impedance unit 23 can be connected to CC_IN.
[0051] The equivalent resistance of the first impedance unit 21 is much greater than the equivalent resistance of the second impedance unit 23 .
[0052] In some embodiments, such as Figure 6 As shown, the second impedance unit 23 includes multiple first resistors, namely Ra1...Ra(n-1) and Ran, connected in series. The widths of the multiple first resistors, namely Ra1...Ra(n-1) and Ran, are used to adapt the overcurrent value, and the lengths of the multiple first resistors, namely Ra1...Ra(n-1) and Ran, are used to adapt the resistance value required for the dead battery detection function.
[0053] It should be noted that when CC_IN is short-circuited to high voltage (Vh), such as VBUS, in order to prevent the resistors in the second impedance unit 23 from being damaged, the second impedance unit 23 is configured as multiple first resistors in series, such as n (greater than or equal to 2) first resistors, namely Ra1...Ra(n-1) and Ran. At this time, the high voltage borne by each resistor is Vh / n, and it only needs to meet the required value of the voltage resistance process (such as 5V). At the same time, the width of each resistor is increased to meet the current limiting requirement (overcurrent value) of the resistor at high voltage, and the length of the resistor is increased to meet the resistance value required for the dead battery detection function (determined according to the protocol, for example, the PD protocol requires approximately 5.1KΩ).
[0054] In some embodiments, such asFigure 7 As shown in the figure, the first impedance unit 21 comprises a second resistor R1, a first end of the second resistor R1 being connected with the first port B1; the first switch unit 22 comprises a second transistor M1, a first pole of the second transistor M1 being connected with a second end of the second resistor R1, a second pole of the second transistor M1 being connected with the ground terminal GND, a control pole of the second transistor M1 being connected with an output end of the AND gate AND1; the second switch unit 24 comprises a third transistor M2, a first pole of the third transistor M2 being connected with a second end of the second impedance unit 23, a second pole of the third transistor M2 being connected with the ground terminal GND, a control pole of the third transistor M2 being connected with the first pole of the second transistor M1 and the second end of the second resistor R1; the detection module 20 further comprises a first clamping unit 25, the first clamping unit 25 being connected between the first pole of the second transistor M1 and the ground terminal GND.
[0055] It needs to be explained that, since in actual application, CC_IN can be short-circuited with the adjacent high voltage VBUS, the first transistor M3 needs to use a high-voltage-resistant LDMOS, and the CC_IN needs to meet the ESD and surge requirements of high-voltage resistance. Therefore, clamping the first pole of the second transistor M1 by the first clamping unit 25 can reduce the voltage resistance requirement of the second transistor M1.
[0056] In some embodiments, as shown in the figure, Figure 8 The first clamping unit 25 comprises at least one first Zener diode Z1 in parallel, a cathode of the at least one first Zener diode Z1 being connected with the first pole of the second transistor M1, an anode of the at least one first Zener diode Z1 being connected with the ground terminal GND.
[0057] It needs to be explained that, in order to reduce the area of the second transistor M1, and to reduce the influence of the large equivalent impedance of the second transistor M1 on the accuracy of the dead battery detection resistor, the embodiment clamps the potential of the first pole of the second transistor M1 by the at least one first Zener diode Z1 in parallel, which not only allows the second transistor M1 to use a low-voltage-resistant transistor, but also does not need to use a high-voltage-resistant LDMOS; and for multiple first Zener diodes Z1 in parallel, the current flowing through each first Zener diode Z1 can also be reduced to prevent overcurrent from breaking down the first Zener diode Z1.
[0058] In some embodiments, as shown in the figure, Figure 9 The detection module 20 further comprises a second clamping unit 26, the second clamping unit 26 being connected between the first pole of the third transistor M2 and the ground terminal GND.
[0059] It should be noted that, since in actual application, CC IN can be short-circuited with the adjacent high voltage VBUS, the first transistor M3 needs to use a high-voltage-resistant LDMOS, and CC IN needs to meet the high-voltage-resistant ESD and surge requirements. Therefore, clamping the first electrode of the third transistor M2 by the second clamping unit 26 can reduce the voltage resistance requirement of the third transistor M2.
[0060] In some embodiments, as shown in Figure 10 The second clamping unit 26 includes at least one second Zener diode Z2 in parallel, the cathode of the at least one second Zener diode Z2 is connected with the first electrode of the third transistor M2, and the anode of the at least one second Zener diode Z2 is connected with the ground terminal GND.
[0061] It should be noted that, in order to reduce the area of the third transistor M2, and the large equivalent impedance of the third transistor M2 affects the accuracy of the dead battery detection resistance, the embodiment clamps the potential of the first electrode of the third transistor M2 by the at least one second Zener diode Z2 in parallel, which not only allows the third transistor M2 to use a low-voltage-resistant transistor, but also does not need to use a high-voltage-resistant LDMOS; and for multiple second Zener diodes Z2 in parallel, the current flowing through each second Zener diode Z2 can also be reduced to prevent overcurrent from breaking down the first Zener diode Z1.
[0062] In summary, by clamping the drain of the second transistor M1 and the third transistor M2 by the first Zener diode Z1 and the second Zener diode Z2 (the clamping value of each Zener diode in the process is 5.75V), it is necessary to pay attention to the overcurrent of the two Zener diodes, and by calculation, the current flowing through the second resistor R1 is about (Vh-5.75V) / R1, and the current flowing through the multiple first resistors is about (Vh-5.75V) / 5.1kΩ.
[0063] When the dead battery detection circuit 100 is working, the current flowing through the second resistor R1 all flows into the first Zener diode Z1, and the current flowing through the first resistor all flows into the third transistor M2; when the dead battery detection circuit 100 is not working, the current flowing through the second resistor R1 all flows into the second transistor M1, and the current flowing through the first resistor all flows into the second Zener diode Z2. The resistance value of the second resistor R1 can be adjusted according to the design requirements. For the second Zener diode Z2, the number of the second Zener diodes Z2 in parallel needs to be determined according to the provided overcurrent information.
[0064] Figure 11A circuit schematic of the dead battery detection circuit 100 provided by the embodiment of the application is shown. Among them, the first port B1 is as a SOURCE, which includes a current source A1 connected in series between CC_IN and the power supply end VCC, for providing a certain current value. The second port B2 is as a SINK, which includes a resistor Rd connected in series between CC_OUT and the ground end GND, for providing a certain resistance value for use in dead battery detection.
[0065] When the system battery is out of power and the dead battery state occurs, the channel enable signal CC_EN is at low potential, the CC channel is closed, that is, the first transistor M3 is turned off, the dead battery detection enable signal DB_ENB is at low potential by default, and the dead battery detection function is enabled by default. At this time, the second transistor M1 is turned off, the gate voltage of the third transistor M2 is high, a plurality of first resistors (about 5.1KΩ) are connected to CC_IN, CC_IN presents a specific voltage according to the current configured by SOURCE (usually 3 grades: 80uA, 180uA, 330uA), so that SOURCE recognizes SINK, and VBUS can supply power to the PD chip 200.
[0066] When the system battery can supply power, the channel enable signal CC_EN is at high potential, the CC channel is reopened, that is, the first transistor M3 is turned on, at this time, the dead battery detection enable signal DB_ENB is set to high, the dead battery detection function is closed, and the Type-C device between the SOURCE and the SINK enters normal communication.
[0067] The embodiment of the application further provides a chip 200, as shown in the figure, the chip 200 includes the dead battery detection circuit 100 described above. The chip 200 is also called an integrated circuit (IC), and the chip 200 can be but is not limited to a SOC (System on Chip) chip, a SIP (system in package) chip. Figure 12
[0068] It can be understood that, since the chip 200 provided by the embodiment of the present application includes the dead battery detection circuit 100 described above, the chip 200 can also be connected to the control end of the driving control module 30 and the detection module 20. The driving control module 30 is configured to reduce the time length between the off time of the dead battery detection function of the detection module 20 and the on time of the switching module 10 according to the channel enable signal CC_EN and the dead battery detection enable signal DB_ENB. As the time length between the off time of the dead battery detection function of the detection module 20 and the on time of the switching module 10 is shortened, the current provided by the power supply end flows through the on switching module 10 instead of the detection module 20 during the switching period from the on to the off of the dead battery detection function, thereby reducing the time length during which the first port B1 connected to the detection module 20 appears to have an excessively high potential, and further alleviating the technical problem that the port connected to the power supply end appears to have an excessively high potential, and also being conducive to avoiding damage to the low-voltage circuit in the later stage.
[0069] The embodiment of the present application also provides an electronic device 300, as shown in the figure, which includes a device main body and the dead battery detection circuit 100 or the chip 200 arranged in the device main body. Figure 13 The electronic device 300 can be, but is not limited to, a body weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a human body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a vehicle-mounted charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a touch pen, a truly wireless earphone, a car control panel, a car, a smart wearable device, a mobile terminal, and a smart home device. The smart wearable device includes, but is not limited to, a smart watch, a smart bracelet, and a cervical vertebra massage instrument. The mobile terminal includes, but is not limited to, a smart phone, a notebook computer, a tablet computer, and a POS (point of sales terminal) machine. The smart home device includes, but is not limited to, a smart socket, a smart rice cooker, a smart sweeper, and a smart lamp.
[0070] It can be understood that, since the electronic device 300 provided by the embodiment of the present application includes the dead battery detection circuit 100 or the chip 200 described above, the driving control module 30 is also connected to the control end of the detection module 20, and the driving control module 30 is used to reduce the time length between the closing time of the dead battery detection function of the detection module 20 and the on time of the switch module 10 according to the channel enable signal CC_EN and the dead battery detection enable signal DB_ENB. Due to the shortening of the time length between the closing time of the dead battery detection function of the detection module 20 and the on time of the switch module 10, the current provided by the power supply end flows through the on switch module 10 instead of the detection module 20 during the switching period from opening to closing of the dead battery detection function, thereby reducing the time length of the first port B1 connected to the detection module 20 appearing over high potential, and further alleviating the technical problem of the port connected to the power supply end appearing over high potential, and also being conducive to avoiding damage to the low-voltage circuit in the later stage.
[0071] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as the above preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make slight changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present application. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application shall still fall within the scope of the technical solution of the present application.
Claims
1. A dead battery detection circuit, characterized by, The dead battery detection circuit comprises: a switch module, configured to control a connection state between the first port and the second port according to a channel enable signal; a detection module, connected with the first port and the switch module; a drive control module, connected with a control terminal of the detection module, and configured to reduce a time length between a turn-off time of a dead battery detection function of the detection module and a turn-on time of the switch module according to the channel enable signal and a dead battery detection enable signal.
2. The dead battery detection circuit of claim 1, wherein, The drive control module comprises: a delay unit, configured to input the channel enable signal; a logic unit, connected with an output terminal of the delay unit at a first input terminal, configured to input the dead battery detection enable signal at a second input terminal, and connected with the control terminal of the detection module at an output terminal, and configured to delay a time length between turning on and turning off of the dead battery detection function.
3. The dead battery detection circuit of claim 2, wherein, The logic unit comprises an AND gate, connected with the output terminal of the delay unit at a first input terminal, configured to input the dead battery detection enable signal at a second input terminal, and connected with the control terminal of the detection module at an output terminal.
4. The dead battery detection circuit of claim 3, wherein, The switch module comprises: a first transistor, connected with the first port and the detection module at a first electrode, and connected with the second port at a second electrode; a charge pump, configured to input a drive voltage at an input terminal, input the channel enable signal at an enable terminal, and connected with a control electrode of the first transistor at an output terminal; wherein an output voltage build-up time of the charge pump is the same as a delay time of the delay unit.
5. The dead battery detection circuit of claim 4, wherein, The detection module comprises: a first impedance unit, connected with the first port and the first electrode of the first transistor at a first terminal; a first switch unit, connected with a second terminal of the first impedance unit at a first terminal, connected with a ground terminal at a second terminal, and connected with the output terminal of the AND gate at a control terminal; a second impedance unit, connected with the first port at a first terminal; a second switch unit, connected with a second terminal of the second impedance unit at a first terminal, connected with the ground terminal at a second terminal, and connected with the first terminal of the first switch unit and the second terminal of the first impedance unit at a control terminal.
6. The dead battery detection circuit of claim 5, wherein, The second impedance unit comprises a plurality of first resistors connected in series, a width of the plurality of first resistors is configured to adapt to an overcurrent value, and a length of the plurality of first resistors is configured to adapt to a resistance value required by the dead battery detection function.
7. The dead battery detection circuit of claim 5, wherein, The first impedance unit comprises a second resistor, connected with the first port at a first terminal; The first switch unit comprises a second transistor, a first pole of the second transistor is connected with a second end of the second resistor, a second pole of the second transistor is connected with the ground terminal, and a control pole of the second transistor is connected with an output terminal of the AND gate. The second switch unit comprises a third transistor, a first pole of the third transistor is connected with a second end of the second impedance unit, a second pole of the third transistor is connected with the ground terminal, and a control pole of the third transistor is connected with the first pole of the second transistor and the second end of the second resistor. The detection module further comprises a first clamping unit, which is connected between the first pole of the second transistor and the ground terminal.
8. The dead battery detection circuit of claim 7, wherein, The first clamping unit comprises at least one first Zener diode in parallel, a cathode of the at least one first Zener diode is connected with the first pole of the second transistor, and an anode of the at least one first Zener diode is connected with the ground terminal.
9. The dead battery detection circuit of claim 7, wherein, The detection module further comprises a second clamping unit, which is connected between the first pole of the third transistor and the ground terminal.
10. The dead battery detection circuit of claim 9, wherein, The second clamping unit comprises at least one second Zener diode in parallel, a cathode of the at least one second Zener diode is connected with the first pole of the third transistor, and an anode of the at least one second Zener diode is connected with the ground terminal.
11. A chip, characterized by The chip comprises the dead battery detection circuit according to any one of claims 1 to 10.
12. An electronic device, comprising: The electronic device comprises a device main body and the dead battery detection circuit according to any one of claims 1 to 10 arranged on the device main body, or the electronic device comprises a device main body and the chip according to claim 11 arranged on the device main body.