Voltage signal detection circuit, power supply device and power consumption device

Abstract

The embodiment of the application relates to a voltage signal detection circuit, a power supply device and a power utilization device, the circuit comprising a first switch unit and a pull-down resistance unit; a first end of the first switch unit is used for connecting a first voltage signal input end, a second end is electrically connected with a first end of the pull-down resistance unit, and the second end is also used for connecting an identification port. When the identification port is not connected with the first voltage signal, the pull-down resistance unit provides a voltage signal for the second end of the first switch unit, the first voltage signal input end provides a voltage signal for the first end of the first switch unit, the two voltage signals make the first switch unit in a pass-through state, the first voltage signal input end provides a first level signal for a third end of the first switch unit, and through the first level signal, it can be judged that the identification port is not connected with the first voltage signal, so as to improve the accuracy of detecting whether the identification port of the power supply device is short-circuited with the voltage signal, and the circuit structure is simple, and the circuit cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of voltage detection, in particular to a voltage signal detection circuit, a power supply device and a power utilization device. BACKGROUND

[0002] In the working process of many circuit systems, it is often necessary to identify whether a certain identification port of the circuit system is short-circuited to a certain voltage signal of the circuit system. When it is identified that the identification port is short-circuited to the voltage signal, a corresponding function operation can be further performed. For example, in some occasions of using a battery to supply power, the battery outputs a positive power supply pole to the outside, and the battery is also provided with an identification port for identifying whether the identification port is short-circuited to the positive power supply pole. When it is identified that the identification port is short-circuited to the positive power supply pole, the battery is discharged to use the battery to supply power.

[0003] However, the voltage detection circuit for detecting whether the identification port is short-circuited to a certain voltage signal cannot accurately detect, is easy to misidentify, and has a complex circuit and high cost. SUMMARY

[0004] Embodiments of the present application aim to provide a voltage signal detection circuit, a power supply device and a power utilization device to improve the accuracy of detecting whether an identification port of a power supply device is short-circuited to a voltage signal and reduce the circuit cost.

[0005] To solve the above technical problems, one technical solution adopted by embodiments of the present application is as follows:

[0006] In a first aspect, the embodiments of the present application provide a voltage signal detection circuit, which comprises a first switch unit and a pull-down resistance unit. A first end of the first switch unit is used to connect a first voltage signal input end, a second end of the first switch unit is electrically connected with a first end of the pull-down resistance unit, and the second end of the first switch unit is also used to connect an identification port. A third end of the first switch unit is a signal output end of the first switch unit. The identification port is used to detect whether the first voltage signal is connected, and the first switch unit is used to output a first level signal at the signal output end when a conduction condition is met.

[0007] In some embodiments, the voltage signal detection circuit further comprises a second switch unit. A third end of the second switch unit is connected with the signal output end of the first switch unit, a first end of the second switch unit is electrically connected with a second voltage signal input end, and a second end of the second switch unit is grounded. The second switch unit is used to be turned on or turned off according to the signal output by the signal output end of the first switch unit. The first end of the second switch unit is a signal output end of the second switch unit.

[0008] In some embodiments, the voltage signal detection circuit further comprises a voltage dividing unit, a first end of the voltage dividing unit is electrically connected with the signal output end of the first switch unit, a second end of the voltage dividing unit is grounded, and a third end of the voltage dividing unit is connected with the third end of the second switch unit, the voltage dividing unit being configured to divide the voltage input at the first end of the voltage dividing unit to output a divided voltage signal at the third end of the voltage dividing unit.

[0009] In some embodiments, the first switch unit comprises a first triode, and the voltage dividing unit comprises a first resistor and a second resistor. A base of the first triode is connected with the first end of the pull-down resistor unit, the base of the first triode is also configured to be connected with the identification port, an emitter of the first triode is configured to be connected with the first voltage signal input end, a collector of the first triode is connected with one end of the first resistor, the other end of the first resistor is connected with the third end of the second switch unit and one end of the second resistor respectively, and the other end of the second resistor is grounded.

[0010] In some embodiments, the voltage signal detection circuit further comprises a first unidirectional conduction circuit. A first end of the first unidirectional conduction circuit is electrically connected with the first end of the first switch unit, and a second end of the first unidirectional conduction circuit is electrically connected with the first voltage signal input end.

[0011] In some embodiments, the voltage signal detection circuit further comprises a second unidirectional conduction circuit. A first end of the second unidirectional conduction circuit is electrically connected with the second end of the first switch unit and the first end of the pull-down resistor unit respectively, and a second end of the second unidirectional conduction circuit is configured to be connected with the identification port.

[0012] In some embodiments, the first unidirectional conduction circuit comprises a first diode and a second diode. An anode of the first diode is electrically connected with the first voltage signal input end, a cathode of the first diode is connected with an anode of the second diode, and a cathode of the second diode is electrically connected with the first end of the first switch unit.

[0013] In some embodiments, the second unidirectional conduction circuit comprises a third diode. A cathode of the third diode is connected with the second end of the first switch unit and the first end of the pull-down resistor unit respectively, and an anode of the third diode is configured to be connected with the identification port.

[0014] In some embodiments, the second switch unit comprises a second triode. A base of the second triode is connected with the third end of the voltage dividing unit, a collector of the second triode is connected with the second voltage signal input end, and an emitter of the second triode is grounded.

[0015] In some embodiments, the voltage signal detection circuit further comprises a filtering circuit. A first end of the filtering circuit is electrically connected to the second voltage signal input end and the first end of the second switch unit respectively, a second end of the filtering circuit is grounded, a third end of the filtering circuit is an output end of the filtering circuit, and the filtering circuit is configured to filter the second voltage signal input from the second voltage signal input end.

[0016] In some embodiments, the filtering circuit comprises a third resistor and a capacitor. One end of the third resistor is connected to the second voltage signal input end and the first end of the second switch unit respectively, the other end of the third resistor is connected to one end of the capacitor, and the other end of the capacitor is grounded.

[0017] In some embodiments, the pull-down resistor unit comprises a fourth resistor, one end of the fourth resistor is connected to the second end of the first switch unit, and the other end of the fourth resistor is grounded.

[0018] In some embodiments, the voltage signal detection circuit further comprises a controller, the controller is connected to the second voltage signal input end and the first end of the second switch unit respectively.

[0019] In a second aspect, the embodiments of the present application provide a power supply device, comprising the voltage signal detection circuit as described above, the power supply device is configured to provide the first voltage signal, and the power supply device is further provided with the identification port.

[0020] In a third aspect, the embodiments of the present application provide a power consumption device, comprising a load and the power supply device as described above, and the power supply device is configured to supply power to the load.

[0021] In some embodiments, the power consumption device comprises at least one of a drone, an electric vehicle, or an electric tool.

[0022] One or more embodiments in the present application include the following beneficial effects: different from prior art, the voltage signal detection circuit includes a first switch unit and a pull-down resistance unit, wherein a first end of the first switch unit is used for connecting a first voltage signal input end, a second end of the first switch unit is electrically connected with a first end of the pull-down resistance unit, and a third end of the first switch circuit is a signal output end of the first switch circuit. When it is needed to detect whether a certain identification port is connected with the first voltage signal, the second end of the first switch unit can be connected with the identification port. When the identification port is not connected with the first voltage signal, the pull-down resistance unit provides a voltage signal for the second end of the first switch unit, and the first voltage signal input end provides a voltage signal for the first end of the first switch unit. The two voltage signals make the first switch unit in a pass-through state, and the first voltage signal input end provides a first level signal for the third end of the first switch unit. Through the first level signal, it can be determined that the identification port is not connected with the first voltage signal, so as to improve the accuracy of detecting whether the identification port of the power supply device is short-circuited with the voltage signal, and the circuit structure is simple, and the circuit cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of one of the power supply devices provided by the embodiments of the present application;

[0024] Figure 2 is a structural schematic diagram of one of the voltage signal detection circuits provided by the embodiments of the present application;

[0025] Figure 3 is a structural schematic diagram of one of the voltage signal detection circuits provided by the embodiments of the present application;

[0026] Figure 4 is a structural schematic diagram of one of the voltage signal detection circuits provided by the embodiments of the present application;

[0027] Figure 5 is a structural schematic diagram of one of the voltage signal detection circuits provided by the embodiments of the present application. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described in more detail below in combination with the drawings and specific embodiments. It should be noted that when one element is described as being “connected” to another element, it can be directly connected to the other element or one or more intermediate elements can be present therebetween.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0030] First, some power supply devices that can implement the voltage signal detection circuit described in the embodiments of this application are introduced.

[0031] Please see Figure 1 , Figure 1 This is a schematic diagram of a power supply device provided in an embodiment of this application. The power supply device 100 provides a first voltage signal. Figure 1 In the illustrated embodiment, the power supply device 100 provides a first voltage signal through an output port 101. The power supply device 100 also has an identification port 102, which is used to identify whether the first voltage signal is connected to the port. The first voltage signal can originate from the positive power supply terminal of the power supply device 100; in other embodiments, the first voltage signal can also originate from the negative power supply terminal of the power supply device 100.

[0032] exist Figure 1 In the illustrated embodiment, the voltage detection circuit 10 is integrated into the power supply device 100. In other embodiments, the voltage detection circuit 10 may be separately disposed from the power supply device 100. The first voltage signal is used to power the voltage detection circuit 10. The voltage detection circuit 10 is also connected to the identification port 102 to detect whether the identification port 102 is connected to the first voltage signal.

[0033] The power supply device 100 can be implemented in various ways, such as a battery, charger, or other power system. The power supply device 100 can have one or more identification ports 102, depending on the functional operations to be performed; typically, one identification port 102 corresponds to one or more functional operations.

[0034] For example, this voltage detection circuit can be used to discharge a power supply device (e.g., a battery) to power a user device (e.g., an electric vehicle). The power supply device can provide a positive power supply terminal to the user device through output port 101 (it can also provide a negative power supply terminal to the user device). When the power supply device is not used by the user device, the identification port is floating and not connected to the positive power supply terminal. In this case, the controller determines that the identification port is not connected to the positive power supply terminal and will not perform a discharge operation on the power supply device.

[0035] When the power supply device is used for the power utilization device, the output port 101 and the identification port 102 are short-circuited, and the identification port 102 accesses the power supply positive electrode. At this time, the controller can detect that the identification port accesses the power supply positive electrode, and then discharges the power supply device to supply power for the power utilization device. The above only illustrates one function implementation. If other functions need to be implemented, more identification ports can also be provided on the power supply device.

[0036] The number of voltage signal detection circuits 10 corresponds to the number of identification ports. One voltage signal detection circuit 10 is provided at each identification port to detect whether the identification port accesses the first voltage signal, for example, to detect whether the identification port accesses the power supply positive electrode of the power supply device 100.

[0037] It should be noted that the above application environment is only for example. In actual application, the voltage signal detection circuit 10 provided by the embodiment of the present application can be further expanded to other suitable application environments, and is not limited to the application environment shown in the above embodiment. For example, the voltage signal detection circuit 10 is used to identify whether the motor controller system port is short-circuited to the positive electrode signal, or is used to identify whether the battery charging system port is short-circuited to the positive electrode signal. Figure 1

[0038] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of a voltage signal detection circuit provided by the embodiment of the present application. As shown in Figure 2 , the voltage signal detection circuit 10 includes a first switch unit 11 and a pull-down resistance unit 12. The first end of the first switch unit 11 is electrically connected with the first voltage signal input end 200. The second end of the first switch unit 11 is electrically connected with the first end of the pull-down resistance unit 12. The third end of the first switch unit 11 is the signal output end of the first switch unit 11.

[0039] When it is needed to detect whether the identification port accesses the first voltage signal, the second end of the first switch unit 11 is electrically connected with the identification port of the power supply device 100. If the second end of the first switch unit 11 is not connected with the first voltage signal, the second end of the first switch unit 11 is in a suspended state. The pull-down resistance unit provides a voltage signal for the second end of the first switch unit. The first voltage signal input end provides a voltage signal for the first end of the first switch unit. The two voltage signals make the first switch unit 11 in a pass-through state. The first voltage signal input end provides a first level signal to the third end of the first switch unit 11. Through the first level signal, it can be determined that the identification port does not access the first voltage signal.

[0040] ​When the second end of the first switch unit 11 is connected to the first voltage signal, both the first end and the second end of the first switch unit 11 are connected to the first voltage signal, so that the first switch unit is turned off, and the third end of the first switch unit cannot output the first level signal.

[0041] That is, when the second end of the first switch unit 11 is not connected to the first voltage signal, the signal output end of the first switch unit outputs the first level signal, and through the first level signal, it can be determined that the identification port of the power supply device 100 is not connected to the first voltage signal, so as to realize accurate detection of the voltage signal, and the circuit structure is simple, and the circuit cost is reduced.

[0042] In some embodiments, the first voltage signal input end 200 is a direct current power supply, and the voltage thereof can be set according to requirements. The first voltage signal input end 200 can be a separately set power supply, or can be directly provided by the power supply positive electrode or the power supply negative electrode of the power supply device 100. Figure 3 In the embodiment shown, the third end of the first switch unit is connected by the controller 13 to detect the first level signal, and determine whether the power supply device 100 is connected to the first voltage signal through the first level signal. In other embodiments, other processing modules with operation processing capabilities can also be used to detect the first level signal.

[0043] In some embodiments, the controller 13 can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a single chip microcomputer, an ARM (Acorn RISC Machine), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of these components.

[0044] In some embodiments, the first voltage signal input end 200 is a direct current power supply, and the voltage thereof can be set according to requirements. The first voltage signal input end 200 can be a separately set power supply, or can be directly provided by the power supply positive electrode or the power supply negative electrode of the power supply device 100.

[0045] Please refer to Figure 4 , Figure 4 is a circuit structure schematic diagram of a voltage signal detection circuit provided by an embodiment of the present application, and the voltage signal detection circuit further includes a voltage dividing unit 14, a first end of the voltage dividing unit 14 is electrically connected to the third end of the first switch unit 11, a second end of the voltage dividing unit 14 is grounded, and a third end of the voltage dividing unit 14 is electrically connected to the controller 13. When the second end of the first switch unit 11 is not connected to the first voltage signal, the first switch unit 11 is in a conductive state, the signal output end of the first switch unit 11 outputs a first level signal, when the voltage dividing unit 14 is connected to the first level signal, the voltage dividing unit 14 divides the first level signal, and transmits a divided voltage signal to the controller 13 through the third end, and the controller 13 processes and analyzes the divided voltage signal.

[0046] Please refer to Figure 4In some embodiments, the voltage signal detection circuit 10 further comprises a first unidirectional conducting circuit 15 and a second unidirectional conducting circuit 16. The first end of the first unidirectional conducting circuit 15 is electrically connected to the first end of the first switch unit 11, and the second end of the first unidirectional conducting circuit 15 is electrically connected to the first voltage signal input end 200. The first end of the second unidirectional conducting circuit 16 is electrically connected to the second end of the first switch unit 11 and the first end of the pull-down resistor unit 12, respectively, and the second end of the second unidirectional conducting circuit 16 is used to connect the identification port 102.

[0047] The second unidirectional conducting circuit 16 is used to protect the first unidirectional conducting circuit 15 and the first switch unit 11 from short circuit to ground, preventing the second end of the first switch unit 11 from being connected to ground or a low-level signal and being burned out. The first voltage signal input end 200 generates a voltage drop on the first unidirectional conducting circuit 15, which then acts on the first end of the first switch unit 11. If the second end of the second unidirectional conducting circuit 16 is connected to the first voltage signal, the first voltage signal generates a voltage drop on the second unidirectional conducting circuit 16, which then acts on the second end of the first switch unit 11. The voltage drop generated on the first unidirectional conducting circuit 15 is greater than or equal to the voltage drop generated on the second unidirectional conducting circuit 16, thereby making the voltage at the first end of the first switch unit 11 less than or equal to the voltage at the second end of the first switch unit 11, so as to ensure that the first switch unit 11 can be reliably turned off. Therefore, the first unidirectional conducting circuit 15 is used to ensure that the first switch unit 11 can be reliably turned off when the second end of the second unidirectional conducting circuit 16 is connected to the first voltage signal.

[0048] In other embodiments, the voltage detection circuit 10 can only include the first unidirectional conducting circuit 15 and not include the second unidirectional conducting circuit 16, which can also make the voltage at the first end of the first switch unit 11 less than or equal to the voltage at the second end of the first switch unit 11, so as to ensure that the first switch unit 11 can be reliably turned off.

[0049] In some embodiments, the voltage signal detection circuit 10 further comprises a second switch unit 17. The third end of the second switch unit 17 is connected to the third end of the voltage dividing unit 14. The first end of the second switch unit 17 is electrically connected to the second voltage signal input end 300 and the controller 13, respectively. The second end of the second switch unit 17 is grounded. The second switch unit 17 is used to be turned on or turned off based on the signal output by the signal output end of the first switch unit 11. The first end of the second switch unit 17 is the signal output end, the second end of the second switch unit 17 is the driving end, and the third end of the second switch unit 17 is the signal input end.

[0050] When the second end of the first switch unit 11 is not connected to the first voltage signal, the second end of the first switch unit 11 is in a floating state, the voltage at the first end of the first switch unit 11 is greater than the voltage at the second end of the first switch unit 11, the first switch unit 11 is in a conducting state, and the signal output end of the first switch unit 11 outputs the first level signal (which can be a high level signal), the second switch unit 17 is in a conducting state, the first end and the second end of the second switch unit 17 are connected, and the controller 13 receives a low level signal. When the second end of the first switch unit 11 is connected to the first voltage signal, the voltage at the first end of the first switch unit 11 is less than or equal to the voltage at the second end of the first switch unit 11, the first switch unit 11 is in a non-conducting state, the third end of the second switch unit 17 is in a non-conducting state due to the absence of an input voltage, and the controller obtains a high level signal through the second voltage signal input end 300. Thus, the controller 13 can determine whether the port is connected to the first voltage signal according to the obtained high level signal or low level signal.

[0051] In some embodiments, the first switch unit 11 or the second switch unit 17 can include a triode, a MOS tube, a contactor, a relay, an electronic switch, a time delay switch, a photoelectric switch, a touch switch, a proximity switch, a double control switch, and the like.

[0052] In some embodiments, the voltage signal detection circuit 10 further includes a filter circuit 18, the first end of the filter circuit 18 is electrically connected to the second voltage signal input end and the first end of the second switch unit 17 respectively, the second end of the filter circuit 18 is grounded, and the third end of the filter circuit 18 is electrically connected to the controller 13. The filter circuit 18 is used to filter the signal of the second voltage signal input end. When the second switch unit 17 is in a conducting state, the second voltage signal input end, the second switch unit 17, and the ground form a closed loop, the first end of the filter circuit 18 is equivalent to the ground, and the filter circuit 18 sends a low level signal to the controller 13 through the third end. When the second switch unit 17 is in a non-conducting state, the signal of the second voltage signal input end is transmitted to the controller 13 after being filtered by the filter circuit 18, and the controller 13 receives a high level signal. Thus, the controller 13 determines whether the second end of the first switch unit 11 is connected to the first voltage signal according to the received level signal.

[0053] Please refer to Figure 5 , Figure 5is a circuit structure schematic diagram of a voltage signal detection circuit provided by an embodiment of the present application, wherein a positive electrode of a power supply device 100 provides a first voltage signal, the positive electrode is P+, and the negative electrode is P-. The first switch unit 11 includes a first transistor Q1, the voltage dividing unit 14 includes a first resistor R1 and a second resistor R2, the base of the first transistor Q1 is connected with the first end of the pull-down resistor unit 12, the emitter of the first transistor Q1 is connected with P+, the collector of the first transistor Q1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the second switch unit 17 and one end of the second resistor R2 respectively, and the other end of the second resistor R2 is grounded.

[0054] In the embodiment of the present application, the first transistor Q1 is a PNP transistor or a PMOS transistor, and the PNP transistor is taken as an example in the figure, and the voltage of the first voltage signal input end 200 is the positive electrode voltage provided by the power supply.

[0055] The first unidirectional conduction circuit 15 includes a first diode D1 and a second diode D2, the anode of the first diode D1 is electrically connected with the positive electrode P+ of the first voltage signal input end 200, the cathode of the first diode D1 is connected with the anode of the second diode D2, the cathode of the second diode D2 is electrically connected with the first end of the first switch unit 11, and specifically, the cathode of the second diode D2 is connected with the emitter of the first transistor Q1.

[0056] The second unidirectional conduction circuit 16 includes a third diode D3, the cathode of the third diode D3 is connected with the second end of the first switch unit 11 and the first end of the pull-down resistor unit 12 respectively, and specifically, the cathode of the third diode D3 is connected with the base of the first transistor Q1, and the anode of the third diode D3 is connected with the identification port ON. In the embodiment of the present application, the first diode D1, the second diode D2 and the third diode D3 can be diodes of the same type and the same specification, which can be Schottky diodes, fast recovery diodes and ordinary switching diodes.

[0057] The second switch unit 17 includes a second transistor Q2, the base of the second transistor Q2 is connected with the third end of the voltage dividing unit 14, the collector of the second transistor Q2 is connected with the second voltage signal input end VCC and the controller 13 respectively, and the emitter of the second transistor Q2 is grounded. Specifically, the base of the second transistor Q2 is connected with the node between the first resistor R1 and the second resistor R2. In the embodiment of the present application, the second transistor Q2 can be an NPN transistor or an NMOS transistor, and the NPN transistor is taken as an example in the figure.

[0058] The filter circuit 18 comprises a third resistor R3 and a capacitor C1. One end of the third resistor R3 is connected to the second voltage signal input end and the first end of the second switch unit 17 respectively, specifically, one end of the third resistor R3 is connected to the second voltage signal input end VCC and the collector of the second transistor Q2 respectively, and the other end of the third resistor R3 is connected to one end of the capacitor C1 and the ON IN signal end of the controller chip MCU respectively, and the other end of the capacitor C1 is grounded.

[0059] The pull-down resistor unit 12 comprises a fourth resistor R4. One end of the fourth resistor R4 is connected to the second end of the first switch unit 11, specifically, one end of the fourth resistor R4 is connected to the base of the first transistor Q1, and the other end of the fourth resistor R4 is grounded. The fourth resistor R4 is used to be connected to the ground at one end so as to fix the other end (i.e. the base of the first transistor Q1) at a low level.

[0060] In some embodiments, the voltage signal detection circuit 10 further comprises a fifth resistor R5. One end of the fifth resistor R5 is connected to the second voltage signal input end, and the other end of the fifth resistor R5 is connected to one end of the third resistor R3 and the collector of the second transistor Q2 respectively. The fifth resistor R5 is a pull-up resistor. The fifth resistor R5 is used to be connected to the second voltage signal input end (high voltage signal) at one end so as to fix the other end (i.e. the ON IN end of the controller) at a high level.

[0061] In some embodiments, the voltage signal detection circuit 10 further comprises a sixth resistor R6. One end of the sixth resistor R6 is connected to the anode of the first diode D1, and the other end of the sixth resistor R6 is connected to the base of the first transistor Q1, the cathode of the third diode D3 and one end of the fourth resistor R4 respectively. The sixth resistor R6 functions to divide voltage P+ and clamp the voltage difference between the base and the emitter of the first transistor Q1 within a reasonable range, preventing the first transistor Q1 from being misdirected.

[0062] Among the above resistors, the first resistor R1 is a current-limiting resistor, the second resistor R2 and the sixth resistor R6 are bias resistors, the third resistor R3 is a filter resistor, the fourth resistor R4 is a pull-down resistor, and the fifth resistor R5 is a pull-up resistor.

[0063] Please continue to refer to Figure 5 , Figure 5Taking a battery as an example, the positive electrode of the battery cell is B+, the negative electrode of the battery cell is B-, the output positive electrode is P+ / C+, the output negative electrode is P- / C-, the negative electrode B- of the battery cell is equivalent to a ground terminal, the identification port of the battery is an ON port, and the voltage signal detection circuit is used to detect whether the high voltage signal P+ / C+ is connected to the ON port. If the external switch SW1 is used to simulate the connection state between the high voltage signal P+ / C+ and the identification port ON port, when the external switch SW1 is closed, the high voltage signal P+ is short-circuited to the ON port, and when the external switch SW1 is disconnected, the high voltage signal P+ is not short-circuited to the ON port, wherein the insulation resistance of the external switch SW1 is the resistance RL.

[0064] In combination Figure 5 The working principle of the voltage signal detection circuit can be described as follows:

[0065] When the ON port is in a floating state, in the initial power-on stage, the high voltage signal P+ is grounded through the first diode D1, the second diode D2, the emitter of the first transistor Q1, the base of the first transistor Q1 and the fourth resistor R4, so that the BE junction of the first transistor Q1 is in a positive bias state, thereby making the first transistor Q1 conductive. At this time, the high voltage signal P+ is grounded through the first diode D1, the second diode D2, the emitter of the first transistor Q1, the collector of the first transistor Q1, the first resistor R1 and the second resistor R2, and the first resistor R1 and the second resistor R2 divide the P+ voltage, and the divided voltage signal is a high level signal. The high level signal acts on the base of the second transistor Q2 to drive the second transistor Q2 to conduct, and the collector voltage of the second transistor Q2 is pulled down to GND, that is, a low level, and at the same time, the controller 13 recognizes the low level signal at the ON_IN port, confirming that the ON port is not short-circuited with the high voltage signal P+.

[0066] When the ON port is short-circuited with the high voltage signal P+, that is, when the external switch SW1 is closed, the base voltage of the first transistor Q1 is equal to the P+ voltage minus the voltage drop of the third diode D3, and the emitter voltage of the first transistor Q1 is equal to the P+ voltage minus the voltage drop of the first diode D1 and the second diode D2. At the same time, the first transistor Q1, the second transistor Q2 and the third transistor Q3 are the same type and specification of transistors, so the emitter voltage of the first transistor Q1 must be less than the base voltage of the first transistor Q1, and the first transistor Q1 is in a cut-off state. The P+ voltage cannot drive the second transistor Q2 through the voltage division of the first resistor R1 and the second resistor R2, and the second transistor Q2 is in a cut-off state. Therefore, the signal at the ON_IN port of the controller 13 is pulled up to the second voltage signal input end VCC by the fifth resistor R5, the controller 13 can be interrupted to wake up, and at the same time, it is detected that the signal level at the ON_IN port is high, it is determined that the ON port is connected with P+, and it is determined that the ON port is short-circuited with the first voltage signal.

[0067] In actual use, the power consumption of the circuit needs to be concerned, and the resistance values of the first resistor R1, the second resistor R2 and the fourth resistor R4 need to be selected according to the size of the input P+ voltage. The transistor drain current characteristics need to be considered, and the first resistor R1 resistance value is reasonably set to prevent the second transistor Q2 from being mis-conducted due to excessive drain current, and the controller to mis-identify the interface state. At the same time, the proportional relationship between the first resistor R1 and the second resistor R2 is considered, so that the second transistor Q2 can also be normally conducted when P+ is at the lowest voltage, and the second transistor Q2 needs to work in a saturated state. The working state of the transistor is adjusted by adjusting the resistance values of the first resistor R1, the second resistor R2, the fourth resistor R4 and the fifth resistor R5. In order to prevent the first diode D1, the second diode D2 and the first transistor Q1 from being burned out when the ON port is short-circuited to the ground, the third diode D3 with a suitable reverse voltage needs to be selected. In order to ensure the reliable operation of the circuit, the first diode D1, the second diode D2 and the third diode D3 need to be selected as the same type of diode. In addition, in order to increase the robustness and reliability of the circuit, protective devices such as voltage stabilizing diodes, filter circuits and transient voltage suppression diodes can be added to the ON port or the port of the controller as needed.

[0068] The existing voltage signal detection circuit mainly generates a voltage division through a resistance voltage division circuit to drive a MOS tube or a transistor to generate a level inversion, and a controller identifies the inversion signal to determine whether a specified node (i.e. an identification port) has a voltage input. The voltage division circuit is usually composed of two series resistors, one end of the voltage division circuit is connected to the identification port, the other end is grounded, and the node between the two resistors is connected to the controller as the output end of the voltage division circuit. In order to still be able to identify the input of P+ to the identification port when P+ is low, the voltage division resistors need to be large enough, and at the same time, in order to reduce the power consumption of the circuit, the resistance values of the two series resistors also need to be large, but this is easy to cause detection errors.

[0069] For example, when the battery causes the insulation between the identification port and the battery P+ output port to decrease due to water leakage or other reasons, even if the identification port and the output port are not truly short-circuited, RL is still large, and a voltage signal will also be generated at the identification port. Since the voltage division resistors are large, the voltage division circuit can still output a large voltage division signal. At this time, the controller will detect the voltage division signal and mistakenly think that the identification port has been input with P+. Therefore, the anti-insulation leakage capability of the prior art is poor, and misidentification is easy to occur. If the probability of misidentification is to be reduced, the resistance value of the voltage division resistor will be reduced, which will increase the power consumption of the circuit, so that the prior art cannot meet the dual requirements of low power consumption and high identification accuracy.

[0070] The technical scheme of the embodiment of the present application is to Figure 5As an example of the illustrated embodiment, when the identification port is not connected to P+, the base of the first transistor Q1 is pulled to a low level by the pull-down resistor R4, the emitter of the first transistor Q1 is at a high level, the first transistor Q1 is in a conducting state, and the second transistor Q2 is turned on due to the high level output by the first transistor Q1. At this time, the controller detects a low level. When the battery is caused to have a reduced insulation between the identification port and the P+ output port due to water leakage or other reasons, because the identification port and the output port are not actually short-circuited, the insulation resistance RL is still large, and although the identification port can be connected to a voltage signal smaller than P+, the voltage at the base of the first transistor Q1 is still smaller than the voltage at the emitter of the first transistor Q1, and the first transistor Q1 is still in a conducting state.

[0071] Only when the identification port and the output port are actually short-circuited, the insulation resistance RL is particularly small, the voltage dropped by the insulation resistance RL is particularly small, the voltage at the base of the first transistor Q1 can be greater than the voltage at the emitter of the first transistor Q1, the first transistor Q1 is in a cut-off state, and the second transistor Q2 is cut off. The controller detects a high level at one end of the pull-up resistor R5, the level signal detected by the controller is reversed, and the controller detects that the identification port is connected to P+.

[0072] The voltage signal detection circuit 10 of the embodiment has strong anti-insulation leakage capability and high identification accuracy, and does not cause misidentification when the insulation resistance RL is too large. At the same time, the voltage signal detection circuit 10 can reduce the power consumption of the circuit by adjusting the resistance values of the first resistor R1 and the second resistor R2, and thus can meet the dual requirements of low power consumption and high identification accuracy.

[0073] In summary, the voltage signal detection circuit can accurately detect whether the identification port of the power supply device is short-circuited to the first voltage signal, has high identification accuracy, and has low power consumption.

[0074] The embodiment of the application also provides a power consumption device, which comprises a load and the power consumption device according to any one of the above embodiments, and the power consumption device is, for example, a drone, an electric vehicle, or an electric tool.

[0075] It should be noted that the specification and drawings of the application provide a preferred embodiment of the application, but the application can be implemented in many different forms, and is not limited to the embodiments described in the specification. These embodiments are not additional limitations on the content of the application, and the purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive. Furthermore, the above technical features continue to be combined with each other, forming various embodiments not listed above, which are all considered to be within the scope of the disclosure; further, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes should be within the protection scope of the appended claims of the application.

Claims

1. A voltage signal detection circuit, characterized by, The voltage signal detection circuit comprises a first switch unit and a pull-down resistance unit; The first end of the first switch unit is used for connecting a first voltage signal input end, the second end of the first switch unit is electrically connected with the first end of the pull-down resistance unit, and the second end of the first switch unit is also used for connecting an identification port, and the third end of the first switch unit is a signal output end of the first switch unit; The identification port is used for detecting whether the first voltage signal is connected, and the first switch unit is used for outputting a first level signal at the signal output end when a conduction condition is met. The voltage signal detection circuit further comprises a first unidirectional conduction circuit; The first end of the first unidirectional conduction circuit is electrically connected with the first end of the first switch unit, and the second end of the first unidirectional conduction circuit is electrically connected with the first voltage signal input end. The voltage signal detection circuit further comprises a second unidirectional conduction circuit; The first end of the second unidirectional conduction circuit is electrically connected with the second end of the first switch unit and the first end of the pull-down resistance unit respectively, and the second end of the second unidirectional conduction circuit is used for connecting the identification port. The voltage drop generated by the first voltage signal on the first unidirectional conduction circuit is greater than or equal to the voltage drop generated by the first voltage signal on the second unidirectional conduction circuit. The voltage signal detection circuit further comprises a second switch unit; The third end of the second switch unit is connected with the signal output end of the first switch unit, the first end of the second switch unit is electrically connected with a second voltage signal input end, the second end of the second switch unit is grounded, and the second switch unit is used for being turned on or turned off according to the signal output by the signal output end of the first switch unit, wherein the first end of the second switch unit is a signal output end of the second switch unit.

2. The voltage signal detection circuit of claim 1, wherein, The voltage signal detection circuit further comprises a voltage division unit; The first end of the voltage division unit is electrically connected with the signal output end of the first switch unit, the second end of the voltage division unit is grounded, the third end of the voltage division unit is connected with the third end of the second switch unit, and the voltage division unit is used for dividing the voltage input at the first end of the voltage division unit to output a voltage division signal at the third end of the voltage division unit.

3. The voltage signal detection circuit of claim 2, wherein, The first switch unit comprises a first triode, and the voltage division unit comprises a first resistance and a second resistance; The base of the first triode is connected with the first end of the pull-down resistance unit, the base of the first triode is also used for connecting the identification port, the emitter of the first triode is used for connecting the first voltage signal input end, the collector of the first triode is connected with one end of the first resistance, the other end of the first resistance is connected with the third end of the second switch unit and one end of the second resistance respectively, and the other end of the second resistance is grounded.

4. The voltage signal detection circuit of claim 1, wherein, The first one-way conducting circuit comprises a first diode and a second diode, an anode of the first diode is electrically connected with the first voltage signal input end, a cathode of the first diode is connected with an anode of the second diode, and a cathode of the second diode is electrically connected with a first end of the first switch unit.

5. The voltage signal detection circuit of claim 1, wherein, The second one-way conducting circuit comprises a third diode, a cathode of the third diode is connected with a second end of the first switch unit and a first end of the pull-down resistance unit respectively, and an anode of the third diode is used for connecting the identification port.

6. The voltage signal detection circuit according to any one of claims 2 to 3, characterized by, The second switch unit comprises a second triode; A base of the second triode is connected with a third end of the voltage dividing unit, a collector of the second triode is connected with the second voltage signal input end, and an emitter of the second triode is grounded.

7. The voltage signal detection circuit of claim 1, wherein, The voltage signal detection circuit further comprises a filter circuit, a first end of the filter circuit is electrically connected with the second voltage signal input end and a first end of the second switch unit respectively, a second end of the filter circuit is grounded, a third end of the filter circuit is an output end of the filter circuit, and the filter circuit is used for filtering a signal input by the second voltage signal input end.

8. The voltage signal detection circuit of claim 7, wherein, The filter circuit comprises a third resistance and a capacitor, one end of the third resistance is connected with the second voltage signal input end and the first end of the second switch unit respectively, the other end of the third resistance is connected with one end of the capacitor, and the other end of the capacitor is grounded.

9. The voltage signal detection circuit according to any one of claims 1 to 5, characterized by, The pull-down resistance unit comprises a fourth resistance, one end of the fourth resistance is connected with the second end of the first switch unit, and the other end of the fourth resistance is grounded.

10. The voltage signal detection circuit according to any one of claims 1 to 3, characterized by, The voltage signal detection circuit further comprises a controller, the controller is connected with the second voltage signal input end and the first end of the second switch unit respectively.

11. A power supply device, characterized by comprising: The voltage signal detection circuit comprises: The voltage signal detection circuit according to any one of claims 1-10; The power supply device is used for providing the first voltage signal, and the power supply device is further provided with the identification port.

12. An electrical device, characterized by The power supply device according to claim 11 is used for supplying power for the load.

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