Power-drawing controller and power supply apparatus

Abstract

A power-drawing controller and a power supply apparatus, relating to the technical field of batteries. A power-drawing controller (100) comprises: a voltage conversion unit (10), configured to generate a power supply on the basis of a battery voltage so as to supply power to an external device (200); a switching unit (20), an input end of the switching unit (20) being connected to a ground pin of the voltage conversion unit (10), a first output end of the switching unit (20) being adapted to be connected to a battery negative electrode (B-), and a second output end of the switching unit (20) being adapted to be connected to a power supply negative electrode (P-) of a battery management system (300); and a control unit (30), configured to, when the ground pin is connected to the power supply negative electrode (P-) and it is determined that the battery management system (300) performs protection on a battery (400), control the switching unit (20) to switch the ground pin to be connected to the battery negative electrode (B-).

Description

Power taking controller and power supply device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411374307.8, filed on September 29, 2024, and entitled "Power taking controller and power supply device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, in particular to a power taking controller and a power supply device. BACKGROUND

[0004] With the development of intelligence, the battery pack not only needs to provide electric energy, but also needs to communicate with external devices to realize more functions. The power taking mode of these auxiliary functions will affect the overall battery pack function and life and user experience. In the related art, there are two power taking modes for auxiliary function circuits, one is to take power from the negative electrode of the battery, and the other is to take power from the negative electrode of the power management system. The circuit design is simple when taking power from the negative electrode of the battery, but it lacks protection mechanism, and when the battery state is abnormal, it cannot cut off the power supply of the auxiliary function circuit, so there is a safety hazard. Taking power from the negative electrode of the power management system can improve the safety of the auxiliary function circuit, but when the power management system cuts off the negative electrode power supply, the auxiliary function circuit will be powered off, thereby affecting the normal operation of the device. SUMMARY

[0005] The present disclosure aims to at least partially solve one of the technical problems in the related art. To this end, the first object of the present disclosure is to provide a power taking controller, which switches the power taking mode of the external device from the power supply negative electrode of the battery management system to the negative electrode of the battery when the battery management system protects the battery, thereby realizing uninterrupted power supply to the external device, which does not affect the normal operation of the external device.

[0006] The second object of the present disclosure is to provide a power supply device.

[0007] To achieve the above object, according to a first aspect of the present disclosure, a power taking controller is provided, comprising: a voltage conversion unit, an input end of the voltage conversion unit being adapted to be connected to a positive electrode of a battery, an output end of the voltage conversion unit being adapted to be connected to an external device, the voltage conversion unit being configured to perform voltage conversion on a battery voltage to generate a power supply voltage, and provide the power supply voltage to the external device to supply power to the external device; a switching unit, an input end of the switching unit being connected to a ground pin of the voltage conversion unit, a first output end of the switching unit being adapted to be connected to a negative electrode of the battery, a second output end of the switching unit being adapted to be connected to a power supply negative electrode of a battery management system, wherein the battery management system is adapted to be connected to a load; and a control unit, the control unit being connected to the switching unit, the control unit being configured to control the switching unit to switch the ground pin to be connected to the negative electrode of the battery in a case that the ground pin is connected to the power supply negative electrode and it is determined that the battery management system protects the battery.

[0008] The power taking controller according to the embodiments of the present disclosure comprises the voltage conversion unit, the switching unit and the control unit, wherein the input end of the voltage conversion unit is adapted to be connected to the positive electrode of the battery, the output end of the voltage conversion unit is adapted to be connected to the external device, the voltage conversion unit is configured to perform voltage conversion on the battery voltage to generate the power supply voltage, and provide the power supply voltage to the external device to supply power to the external device, the input end of the switching unit is connected to the ground pin of the voltage conversion unit, the first output end of the switching unit is adapted to be connected to the negative electrode of the battery, the second output end of the switching unit is adapted to be connected to the power supply negative electrode of the battery management system, wherein the battery management system is adapted to be connected to the load, the control unit is connected to the switching unit, and the control unit is configured to control the switching unit to switch the ground pin to be connected to the negative electrode of the battery in a case that the ground pin is connected to the power supply negative electrode and it is determined that the battery management system protects the battery. Thus, when the ground pin is connected to the power supply negative electrode, the power taking mode of the external device is the negative electrode of the battery management system, when the battery management system protects the battery, the battery management system will cut off the connection between the power supply negative electrode and the negative electrode of the battery, at this time, the control unit controls the switching unit to switch the ground pin to be connected to the negative electrode of the battery, so that the power taking mode of the external device is switched to the negative electrode of the battery, and uninterrupted power supply to the external device is realized, so as not to affect the normal operation of the external device.

[0009] According to one embodiment of the present disclosure, the switching unit comprises: a first switch device, one end of the first switch device being connected with the ground pin, and the other end of the first switch device being connected with the negative electrode of the power supply; a first drive module, an input end of the first drive module being connected with the first output end of the control unit, and an output end of the first drive module being connected with the control end of the first switch device, the first drive module being configured to drive the first switch device to turn on according to the first control signal of the control unit; a second switch device, one end of the second switch device being connected with the ground pin, and the other end of the second switch device being connected with the negative electrode of the battery; and a second drive module, an input end of the second drive module being connected with the second output end of the control unit, and an output end of the second drive module being connected with the control end of the second switch device, the second drive module being configured to drive the second switch device to turn on according to the second control signal of the control unit.

[0010] According to one embodiment of the present disclosure, the first drive module and the second drive module each comprise: a first resistor, one end of the first resistor being an input end of the corresponding drive module; a first switch tube, a control end of the first switch tube being connected with the other end of the first resistor, and a second end of the first switch tube being grounded; a second resistor, one end of the second resistor being connected with the control end of the first switch tube, and the other end of the second resistor being connected with the second end of the first switch tube; a second switch tube, a control end of the second switch tube being connected with a first end of the first switch tube and having a first node, a first end of the second switch tube being adapted to input a preset power supply, and a second end of the second switch tube being an output end of the corresponding drive module; and a third resistor, one end of the third resistor being connected with the control end of the second switch tube, and the other end of the third resistor being connected with the first node.

[0011] According to one embodiment of the present disclosure, the first switch tube is a triode, and the second switch tube is a MOS tube.

[0012] According to one embodiment of the present disclosure, the switching unit further comprises: a first isolation transmission module, the first isolation transmission module being arranged between the output end of the first drive module and the control end of the first switch device, and the first isolation transmission module being configured to isolate and transmit the drive signal of the first drive module to the control end of the first switch device; and a second isolation transmission module, the second isolation transmission module being arranged between the output end of the second drive module and the control end of the second switch device, and the second isolation transmission module being configured to isolate and transmit the drive signal of the second drive module to the control end of the second switch device.

[0013] According to one embodiment of the present disclosure, the first switch device and the second switch device are MOS tubes.

[0014] According to one embodiment of the present disclosure, the switching unit further comprises: a first blocking device, an input end of the first blocking device being connected with the ground pin, and an output end of the first blocking device being connected with one end of the first switching device; and a second blocking device, an input end of the second blocking device being connected with the ground pin, and an output end of the second blocking device being connected with one end of the second switching device.

[0015] According to one embodiment of the present disclosure, the first blocking device and the second blocking device are diodes respectively, an anode of the diode being the input end of the corresponding blocking device, and a cathode of the diode being the output end of the corresponding blocking device.

[0016] According to one embodiment of the present disclosure, in the case that the battery management system has a communication function, the control unit is adapted to be communicatively connected with the battery management system, and the control unit is configured to determine that the battery management system protects the battery in the case that a protection signal sent by the battery management system is received.

[0017] According to one embodiment of the present disclosure, the control unit is further configured to control the switching unit to switch the ground pin to be in communication with the negative pole of the power supply in the case that a release signal sent by the battery management system is received.

[0018] According to one embodiment of the present disclosure, the control unit is adapted to be connected with the positive pole of the battery, and the control unit is configured to sample a voltage between the positive pole of the battery and the negative pole of the power supply to obtain a sampling voltage in the case that the ground pin is in communication with the negative pole of the power supply, and determine that the battery management system protects the battery in the case that the sampling voltage does not satisfy a voltage range of the battery.

[0019] According to one embodiment of the present disclosure, the control unit is further configured to control the switching unit to switch the ground pin to be in communication with the negative pole of the power supply at a preset frequency in the case that the ground pin is in communication with the negative pole of the power supply, and control the switching unit to switch the ground pin to be in communication with the negative pole of the power supply in the case that the sampling voltage satisfies the voltage range.

[0020] According to one embodiment of the present disclosure, the power taking controller further comprises: a power supply unit, an input end of the power supply unit being connected with the output end of the voltage conversion unit, and an output end of the power supply unit being connected with the power supply end of the control unit, and the power supply unit is configured to generate a power supply voltage according to the output voltage of the voltage conversion unit to supply power to the control unit.

[0021] According to one embodiment of the present disclosure, the power supply unit comprises: a first capacitor, one end of the first capacitor being connected with an output end of the voltage conversion unit, the other end of the first capacitor being connected with a ground pin, the first capacitor being configured to provide power when the switching unit switches; a linear voltage regulator, input ends of the linear voltage regulator being connected with the output end of the voltage conversion unit and the one end of the first capacitor respectively, an output end of the linear voltage regulator being connected with a power supply end of the control unit, the linear voltage regulator being configured to generate a power supply voltage according to the output voltage of the voltage conversion unit or the power provided by the first capacitor, and provide the power supply voltage to the control unit.

[0022] To achieve the above object, according to a second aspect of the present disclosure, a power supply device is provided, comprising the power taking controller of any one of the preceding embodiments.

[0023] According to the power supply device of the embodiments of the present disclosure, by the power taking controller, when the battery management system protects the battery, the power taking mode of the external device is switched from the power supply negative pole of the battery management system to the battery negative pole, uninterrupted power supply to the external device is realized, so that the normal operation of the external device is not affected.

[0024] Additional aspects and advantages of the present disclosure will be made apparent from the following description, which is given by way of example only. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structural schematic diagram of a power taking controller according to one embodiment of the present disclosure;

[0026] Fig. 2 is a circuit diagram of a first driving module and a first switching device according to one embodiment of the present disclosure;

[0027] Fig. 3 is a circuit diagram of a second driving module and a second switching device according to one embodiment of the present disclosure;

[0028] Fig. 4 is a circuit diagram of a first driving module and a first switching device according to another embodiment of the present disclosure;

[0029] Fig. 5 is a circuit diagram of a second driving module and a second switching device according to another embodiment of the present disclosure;

[0030] Fig. 6 is a structural schematic diagram of a power taking controller according to another embodiment of the present disclosure;

[0031] Fig. 7 is a structural schematic diagram of a power taking controller according to another embodiment of the present disclosure;

[0032] Fig. 8 is a structural schematic diagram of a power taking controller with a power supply unit according to one embodiment of the present disclosure;

[0033] Fig. 9 is a structural schematic diagram of a power supply device according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations used throughout the drawings denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0035] It should be noted that the present disclosure is made by the inventors' understanding and research on the following problems:

[0036] In the related art, there are two ways to take power for the auxiliary function circuit, one is to take power from the negative electrode of the battery, and the other is to take power from the negative electrode of the power management system.

[0037] Taking power from the negative electrode of the battery can reduce the intermediate links in the circuit, making the circuit design relatively simple, reducing the circuit cost, and also ensuring that the auxiliary function circuit can obtain the original energy of the battery, thereby reducing energy loss. However, this power taking method has the following problems:

[0038] 1. Lack of protection mechanism: The battery management system can monitor the battery state and cut off the power supply when the battery is abnormal, thereby protecting the safety of the battery and the circuit. However, taking power directly from the negative electrode of the battery cannot cut off the power supply;

[0039] 2. Unable to monitor the battery state: Because there is no monitoring by the battery management system, the power taking circuit cannot know the accurate battery state, which may cause the battery to be over-discharged, damaged, or even cause safety problems;

[0040] 3. Lack of intelligent management: The battery management system not only provides protection, but also enables intelligent management of the battery, such as optimizing the charging and discharging strategy, prolonging the battery life, etc., but taking power directly from the negative electrode of the battery cannot achieve these functions;

[0041] 4. Safety hazards: If the battery has internal short circuit, overcharge, overdischarge and other safety hazards, taking power directly from the negative electrode of the battery may be affected by these hazards, thereby causing safety accidents.

[0042] Taking power from the negative electrode of the power management system can ensure that the circuit receives real-time monitoring and protection from the battery management system, preventing abnormal conditions such as overcharge, overdischarge, short circuit, etc., thereby improving the safety of the circuit, and also enabling more efficient and reliable energy utilization. However, this power taking method has the following problems:

[0043] 1. Strong dependence on battery management system: The power supply from the negative pole of the power management system is highly dependent on the performance and stability of the battery management system. If the battery management system fails or fails, it may affect the normal operation of the circuit;

[0044] 2. Device power failure: due to the disconnection between the negative pole of the power management system and the negative pole of the battery, the external device will lose connection with the battery, so it will be powered off immediately. This may affect the normal operation of the device, especially in the case of continuous power supply;

[0045] 3. Device damage: sudden power interruption may cause damage to the device, especially for those devices that do not have good power-off protection mechanism, such damage may include data loss, hardware failure or other unpredictable problems.

[0046] Based on this, the embodiments of the present disclosure provide a power taking controller and a power supply device, when the battery management system protects the battery, the power taking mode of the external device is switched from the power negative pole of the battery management system to the battery negative pole, realizing uninterrupted power supply to the external device, so as to not affect the normal operation of the external device.

[0047] The power taking controller and the power supply device of the embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0048] Fig. 1 is a structural schematic diagram of a power taking controller according to an embodiment of the present disclosure. As shown in Fig. 1, the power taking controller 100 includes a voltage conversion unit 10, a switching unit 20 and a control unit 30.

[0049] The input end of the voltage conversion unit 10 is adapted to be connected to the positive pole B+ of the battery, the output end of the voltage conversion unit 10 is adapted to be connected to the external device 200, and the voltage conversion unit 10 is configured to perform voltage conversion on the battery voltage to generate a power supply voltage and provide the power supply voltage to the external device 200 to supply power to the external device 200; The input end of the switching unit 20 is connected to the ground pin of the voltage conversion unit 10, the first output end of the switching unit 20 is adapted to be connected to the negative pole B- of the battery, and the second output end of the switching unit 20 is adapted to be connected to the power negative pole P- of the battery management system 300, wherein the battery management system 300 is adapted to be connected to a load (not shown); The control unit 30 is connected to the switching unit 20, and the control unit 30 is configured to control the switching unit 20 to switch the ground pin to be connected to the negative pole B- of the battery in the case that the ground pin is connected to the power negative pole P- and it is determined that the battery management system 300 protects the battery 400.

[0050] Specifically, the power negative pole P- of the battery management system 300 is connected with the battery negative pole B- through the switching device 301, the battery management system 300 monitors the state of the battery 400, and in the case of abnormal state of the battery 400, controls the switching device 301 to be disconnected to protect the battery 400. In the case of normal state of the battery 400, the switching device 301 between the battery negative pole B- and the power negative pole P- is turned on, the ground pin of the voltage conversion unit 10 is connected with the power negative pole P-, and the external device 200 takes power from the power negative pole P-. At this time, the battery management system 300 can protect the power taking controller 100 and the external device 200. In the case of abnormal state of the battery 400, the battery management system 300 protects the battery 400 by controlling the switching device 301 to be disconnected, the connection between the power negative pole P- and the battery negative pole B- is disconnected, therefore, the switching device 301 is controlled to switch the ground pin to be connected with the battery negative pole B-, the voltage conversion unit 10 takes power from the battery negative pole B-, and the voltage conversion unit 10 can continuously generate a power supply to supply power to the external device 200, thereby realizing uninterrupted power supply of the external device 200.

[0051] It should be noted that the power taking controller 100 of the embodiment can be applied to a power supply device, and the external device 200 can be a lamp panel, a communication module, etc. in the power supply device. The load of the embodiment is the load of the power supply device, and the power negative pole P- of the battery management system 300 can also be connected with the negative pole of a charger (not shown).

[0052] Optionally, the power taking controller 100 further comprises a control unit 30, which controls the external device 200 to enter a low-power state after the switching device 20 switches the ground pin to be connected with the battery negative pole B-, thereby reducing the loss of the battery 400.

[0053] In an optional embodiment, the voltage conversion unit 10 can be a power management chip, which can generate different voltages such as 12V and 5V according to the voltage of the battery 400 to supply power to the external device 200. The ground pin of the external device 200 is connected with the ground pin of the voltage conversion unit 10.

[0054] In the above embodiment, when the state of the battery is normal, the ground pin is connected with the power negative pole, and the battery management system can protect the circuit to ensure the safety of the circuit; when the state of the battery is abnormal, the control unit controls the switching device to switch the ground pin to be connected with the battery negative pole, so that the power taking mode of the external device is switched to the battery negative pole, and uninterrupted power supply of the external device is realized, thereby not affecting the normal operation of the external device, and further avoiding the damage of the external device due to power interruption.

[0055] In some embodiments, as shown in FIGS. 2 and 3, the switching unit 20 comprises a first switching device K1, a first driving module 21, a second switching device K2 and a second driving module 22, wherein one end of the first switching device K1 is connected with the ground pin PGND, and the other end of the first switching device K1 is connected with the negative electrode P- of the power supply; the input end of the first driving module 21 is connected with the first output end of the control unit 30, the output end of the first driving module 21 is connected with the control end of the first switching device K1, and the first driving module 21 is configured to drive the first switching device K1 to turn on according to the first control signal of the control unit 30; one end of the second switching device K2 is connected with the ground pin PGND, and the other end of the second switching device K2 is connected with the negative electrode B- of the battery; the input end of the second driving module 22 is connected with the second output end of the control unit 30, the output end of the second driving module 22 is connected with the control end of the second switching device K2, and the second driving module 22 is configured to drive the second switching device K2 to turn on according to the second control signal of the control unit 30.

[0056] It can be understood that when the battery 400 is in a normal state, the control unit 30 generates the first control signal and stops generating the second control signal, the first driving module 21 drives the first switching device K1 to turn on according to the first control signal, and the second switching device K2 is in an off state. In the case of protecting the battery 400 by the battery management system 300, the control unit 30 generates the second control signal and stops generating the first control signal, the second driving module 22 drives the second switching device K2 to turn on, and the first switching device K1 is in an off state.

[0057] In some embodiments, as shown in FIGS. 2 and 3, the first driving module 21 and the second driving module 22 each comprise a first resistor R1, a first switch tube Q1, a second resistor R2, a second switch tube Q2 and a third resistor R3, wherein one end of the first resistor R1 is the input end of the corresponding driving module, the control end of the first switch tube Q1 is connected with the other end of the first resistor R1, and the second end of the first switch tube Q1 is grounded; one end of the second resistor R2 is connected with the control end of the first switch tube Q1, and the other end of the second resistor R2 is connected with the second end of the first switch tube Q1; the control end of the second switch tube Q2 is connected with the first end of the first switch tube Q1 and has a first node J1, the first end of the second switch tube Q2 is adapted to input a preset power supply, and the second end of the second switch tube Q2 is the output end of the corresponding driving module; one end of the third resistor R3 is connected with the control end of the second switch tube Q2, and the other end of the third resistor R3 is connected with the first node J1.

[0058] Specifically, the circuit structures of the first driving module 21 and the second driving module 22 are the same. FIG. 2 shows a circuit diagram of the first driving module 21, which includes a first resistor R1, a first switch Q1, a second resistor R2, a second switch Q2, and a third resistor R3. One end of the first resistor R1 is an input end of the first driving module 21, a control end of the first switch Q1 is connected to the other end of the first resistor R1, a second end of the first switch Q1 is grounded, one end of the second resistor R2 is connected to the control end of the first switch Q1, the other end of the second resistor R2 is connected to the second end of the first switch Q1, a control end of the second switch Q2 is connected to a first end of the first switch Q1 and has a first node J1, a first end of the second switch Q2 is adapted to input a preset power supply, a second end of the second switch Q2 is an output end of the first driving module 21, one end of the third resistor R3 is connected to the first end of the second switch Q2, and the other end of the third resistor R3 is connected to the first node J1. The control unit 30 inputs a first control signal to the first switch Q1 through the first resistor R1, so that the first switch Q1 is turned on, and the first switch Q1 is turned on to turn on the second switch Q2, and the second switch Q2 is turned on to generate a first driving signal of a first switch device K1, so that the first switch device K1 is turned on.

[0059] FIG. 3 shows a circuit diagram of the second driving module 22, which includes a fourth resistor R4, a third switch Q3, a fifth resistor R5, a fourth switch Q4, and a sixth resistor R6. One end of the fourth resistor R4 is an input end of the second driving module 22, a control end of the third switch Q3 is connected to the other end of the fourth resistor R4, a second end of the third switch Q3 is grounded, one end of the fifth resistor R5 is connected to the control end of the third switch Q3, the other end of the fifth resistor R5 is connected to the second end of the third switch Q3, a control end of the fourth switch Q4 is connected to a first end of the third switch Q3 and has a second node J2, a first end of the fourth switch Q4 is adapted to input a preset power supply, a second end of the fourth switch Q4 is an output end of the second driving module 22, one end of the sixth resistor R6 is connected to the first end of the fourth switch Q4, and the other end of the sixth resistor R6 is connected to the second node J2. The control unit 30 inputs a second control signal to the third switch Q3 through the fourth resistor R4, so that the third switch Q3 is turned on, and the third switch Q3 is turned on to turn on the fourth switch Q4, and the fourth switch Q4 is turned on to generate a second driving signal of the second switch device K2, so that the second switch device K2 is turned on.

[0060] In some embodiments, as shown in FIGS. 2 and 3, the first switch Q1 is a triode, and the second switch Q2 is a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube.

[0061] For example, as shown in FIG. 2, the first switch tube Q1 is an NPN triode, and the second switch tube Q2 is a PMOS (Positive Channel Metal Oxide Semiconductor) tube. When the control unit 30 does not output the first control signal, the first switch tube Q1 is in an off state, and the second resistance R2 pulls the control end of the second switch tube Q2 to a high level, so that the second switch tube Q2 is in an off state, the first drive module 21 cannot generate the first drive signal, and the first switch device K1 is in an off state. When the control unit 30 outputs the first control signal, the first switch tube Q1 is turned on, and the control end of the second switch tube Q2 is pulled to a low level after the first switch tube Q1 is turned on, the second switch tube Q2 is turned on, the second switch tube Q2 provides the preset power supply to the first switch device K1 after being turned on, and the first switch device K1 is turned on.

[0062] It should be noted that the working mode of the second drive module 22 is the same as that of the first drive module 21, which will not be described here.

[0063] In some embodiments, as shown in FIGS. 2 and 3, the first switch device K1 and the second switch device K2 are MOS tubes, respectively.

[0064] Specifically, the first switch device K1 and the second switch device K2 can be NMOS (Negative Channel Metal Oxide Semiconductor) tubes, respectively. When the second switch tube Q2 is in an off state, the second switch tube Q2 cannot provide the preset power supply to the first switch device K1, so that the first switch device K1 is in an off state; when the second switch tube Q2 is turned on, the control end of the first switch device K1 is pulled to a high level by the second switch tube Q2, and the first switch device K1 is turned on. Similarly, when the fourth switch tube Q4 is in an off state, the fourth switch tube Q4 cannot provide the preset power supply to the second switch device K2, so that the second switch device K2 is in an off state; when the fourth switch tube Q4 is turned on, the control end of the second switch device K2 is pulled to a high level by the fourth switch tube Q4, and the second switch device K2 is turned on.

[0065] It should be noted that the first switch device K1 and the second switch device K2 are not limited to MOS tubes, but can also be other switch devices, such as relays, which are not limited here.

[0066] In the above embodiments, the first switch device and the second switch device are MOS tubes, respectively. Because the switching speed of the MOS tube is relatively fast, the voltage conversion unit can timely switch the connection mode of the ground pin.

[0067] In some embodiments, as shown in FIGS. 4 and 5, the switching unit 20 further comprises a first isolation transmission module 23 and a second isolation transmission module 24, wherein the first isolation transmission module 23 is arranged between the output end of the first driving module 21 and the control end of the first switching device K1, and the first isolation transmission module 23 is configured to isolate and transmit the driving signal of the first driving module 21 to the control end of the first switching device K1; the second isolation transmission module 24 is arranged between the output end of the second driving module 22 and the control end of the second switching device K2, and the second isolation transmission module 24 is configured to isolate and transmit the driving signal of the second driving module 22 to the control end of the second switching device K2.

[0068] Specifically, when the switching unit 20 switches the connection mode of the ground pin PGND of the voltage conversion unit 10, the control end voltage of the first switching device K1 and the second switching device K2 will be unstable due to the change of the ground. The first isolation transmission module 23 and the second isolation transmission module 24 can output stable output signals according to the input signals, so the first isolation transmission module 23 can output stable electrical signals according to the driving signal of the first driving module 21 to drive the first switching device K1 to turn on, and the second isolation transmission module 24 can output stable electrical signals according to the driving signal of the second driving module 22 to drive the second switching device K2 to turn on.

[0069] In an alternative embodiment, as shown in FIGS. 4 and 5, the first isolation transmission module 23 comprises a first isolation power supply chip 231, and the second isolation transmission module 24 comprises a second isolation power supply chip 241. The positive input end of the first isolation power supply chip 231 is connected with the second end of the second switching tube Q2, the negative input end of the first isolation power supply chip 231 is connected with the positive input end of the first isolation power supply chip 231 through the second capacitor C2 and grounded, the positive output end of the first isolation power supply chip 231 is connected with the control end of the first switching device K1, and the negative output end of the first isolation power supply chip 231 is connected with the positive output end of the first isolation power supply chip 231 and the negative electrode P- of the power supply through the third capacitor C3. In the case that the second switching tube Q2 is turned on, the positive input end of the first isolation power supply chip 231 is inputted with a preset power supply, so the positive output end of the first isolation power supply chip 231 outputs a voltage signal; in the case that the second switching tube Q2 is turned off, the positive input end of the first isolation power supply chip 231 has no signal input, so the positive output end of the first isolation power supply chip 231 also has no signal output.

[0070] The positive input end of the second isolated power supply chip 241 is connected with the second end of the fourth switch tube Q4, the negative input end of the second isolated power supply chip 241 is connected with the positive input end of the second isolated power supply chip 241 through the fourth capacitor C4 and grounded, the positive output end of the second isolated power supply chip 241 is connected with the control end of the second switch device K2, and the negative output end of the second isolated power supply chip 241 is connected with the positive output end of the second isolated power supply chip 241 and the negative electrode B- of the battery through the fifth capacitor C5. In the case that the fourth switch tube Q4 is turned on, the preset power supply inputs the positive input end of the second isolated power supply chip 241, so that the positive output end of the second isolated power supply chip 241 outputs a voltage signal; in the case that the fourth switch tube Q4 is turned off, the positive input end of the second isolated power supply chip 241 has no signal input, so that the positive output end of the second isolated power supply chip 241 also has no signal output.

[0071] In the above embodiment, the driving signals of the first driving module and the second driving module are respectively isolated and transmitted by the first isolated transmission module and the second isolated transmission module, so that the unstable situation of the control end voltage of the first switch device and the second switch device due to the change of the ground can be avoided. Moreover, the first isolated transmission module and the second isolated transmission module are controlled by the first switch tube and the third switch tube, when the first switch tube and the third switch tube are triodes, the loss of the first switch tube and the third switch tube is small, so that the power consumption of the power supply controller can be reduced, thereby reducing the loss of the battery.

[0072] In some embodiments, as shown in FIG. 4 and FIG. 5, the switching unit 20 further comprises a first blocking device 25 and a second blocking device 26, wherein the input end of the first blocking device 25 is connected with the ground pin PGND, the output end of the first blocking device 25 is connected with one end of the first switch device K1; the input end of the second blocking device 26 is connected with the ground pin PGND, and the output end of the second blocking device 26 is connected with one end of the second switch device K2.

[0073] Specifically, as shown in FIG. 4 and FIG. 5, in the case that the first switch device K1 and the second switch device K2 are NMOS tubes respectively, the drain of the first switch device K1 is connected with the ground pin PGND, the source of the first switch device K1 is connected with the negative electrode P- of the power supply, thus the cathode of the body diode of the first switch device K1 is connected with the ground pin PGND, the anode of the body diode of the first switch device K1 is connected with the negative electrode P- of the power supply, the drain of the second switch device K2 is connected with the ground pin PGND, the source of the second switch device K2 is connected with the negative electrode B- of the battery, thus the cathode of the body diode of the second switch device K2 is connected with the ground pin PGND, the anode of the body diode of the second switch device K2 is connected with the negative electrode B- of the battery, thus the negative electrode B- of the battery and the negative electrode P- of the power supply can be connected through the body diode of the first switch device K1 and the body diode of the second switch device K2. In order to solve the above problem, the first blocking device 25 is added between the first switch device K1 and the ground pin PGND, and the second blocking device 26 is added between the second switch device K2 and the ground pin PGND, so as to block the negative electrode B- of the battery and the negative electrode P- of the power supply.

[0074] In some embodiments, as shown in FIG. 4 and FIG. 5, the first blocking device 25 and the second blocking device 26 are diodes respectively, the anode of the diode is the input end of the corresponding blocking device, and the cathode of the diode is the output end of the corresponding blocking device.

[0075] As shown in FIG. 4, the first blocking device 25 is a first diode D1, the anode of the first diode D1 is connected with the ground pin PGND, and the cathode of the first diode D1 is connected with one end of the first switch device K1. As shown in FIG. 5, the second blocking device 26 is a second diode D2, the anode of the second diode D2 is connected with the ground pin PGND, and the cathode of the second diode D2 is connected with one end of the second switch device K2. The first diode D1 and the second diode D2 can block the electrical signal between the negative electrode P- of the power supply and the negative electrode B- of the battery, so as to avoid the connection between the negative electrode P- of the power supply and the negative electrode B- of the battery.

[0076] In the above embodiments, the first blocking device is added between the first switch device and the ground pin, and the second blocking device is added between the second switch device and the ground pin, so as to block the electrical signal between the negative electrode of the power supply and the negative electrode of the battery, and avoid the connection between the negative electrode of the power supply and the negative electrode of the battery.

[0077] In some embodiments, as shown in FIG. 6, in the case that the battery management system 300 has a communication function, the control unit 30 is adapted to be in communication connection with the battery management system 300, and the control unit 30 is configured to determine that the battery management system 300 protects the battery 400 in the case that a protection signal sent by the battery management system 300 is received.

[0078] That is, when the battery management system 300 has the communication function, the battery management system 300 can be in communication connection with the control unit 30, when the battery management system 300 protects the battery 400, the battery management system 300 sends a protection signal to the control unit 30, when the control unit 30 receives the protection signal, it is determined that the battery management system 300 protects the battery 400, and the first switching device K1 is controlled to be turned off, and the second switching device K2 is controlled to be turned on.

[0079] In some embodiments, the control unit 30 is also configured to control the switching unit 20 to switch the ground pin to be in communication with the power negative pole P- in the case of receiving the release signal sent by the battery management system 300.

[0080] Specifically, after the battery management system 300 determines that the state of the battery 400 is normal, it will stop protecting the battery 400, at this time, the battery management system 300 sends a release signal to the control unit 30, and the control unit 30 controls the first switching device K1 to be turned on and the second switching device K2 to be turned off when receiving the contact signal, so that the ground pin is in communication with the power negative pole P-.

[0081] In the above embodiment, after the battery management system is in the protection release state, the control unit controls the switching unit to switch to the power negative pole for power supply, so that the battery management system can continue to monitor the circuit, thereby improving the safety of the power controller.

[0082] In some embodiments, as shown in FIG. 7, the control unit 30 is adapted to be connected to the battery positive pole B+, and the control unit 30 is configured to sample the voltage between the battery positive pole B+ and the power negative pole P- to obtain a sampling voltage when the ground pin PGND is in communication with the power negative pole P-, and determine that the battery management system 300 protects the battery 400 when the sampling voltage does not satisfy the voltage range of the battery 400.

[0083] Specifically, if the battery management system 300 does not have a communication function, the battery management system 300 will not send a protection signal to the control unit 30 when it protects the battery 400. Therefore, the control unit 30 is connected to the battery positive pole B+, and the voltage between the battery positive pole B+ and the power negative pole P- is sampled, and if the sampling voltage satisfies the corresponding voltage range of the battery 400, it indicates that the power negative pole P- is in communication with the battery negative pole B-, therefore, the battery management system 300 does not need to protect, and the switching unit 20 does not need to be controlled to switch; if the sampling voltage does not satisfy the voltage range, the power negative pole P- is disconnected from the battery negative pole B-, the battery management system 300 protects the battery 400, and the switching unit 20 needs to be controlled to switch.

[0084] In some embodiments, the control unit 30 is further configured to control the control switching unit 20 to switch the ground pin to be in communication with the power supply negative pole P- at a preset frequency when the ground pin is in communication with the battery negative pole B-, and control the control switching unit 20 to switch the ground pin to be in communication with the power supply negative pole P- when the sampled voltage meets the voltage range.

[0085] Specifically, because the battery management system 300 does not have a communication function, the battery management system 300 cannot send a release signal to the control unit 30, and the control unit 30 needs to continue sampling the voltage between the battery positive pole B+ and the power supply negative pole P- to determine whether the battery management system 300 is released from protection. Because the voltage between the battery positive pole B+ and the power supply negative pole P- cannot be sampled when the ground pin is in communication with the battery negative pole B-, the control switching unit 20 needs to be controlled to switch the ground pin to be in communication with the power supply negative pole P- at a preset frequency, so that the sampled voltage can be obtained. If the sampled voltage meets the voltage range, it indicates that the battery management system 300 is released from protection, and the control switching unit 20 is controlled to switch the ground pin to be in communication with the power supply negative pole P-; if the voltage does not meet the voltage range, it indicates that the battery management system 300 still protects the battery 400, so the ground pin continues to be in communication with the battery negative pole B-.

[0086] It should be noted that in actual applications, different power taking modes can also be selected according to actual needs, for example, when the battery management system 300 does not need to be protected, the control switching unit 20 can be directly controlled to switch the battery negative pole B- to be in communication with the ground pin. If the external device 200 needs to work continuously, the battery negative pole B- can also be switched to be in communication with the ground pin when the power supply negative pole P- fails.

[0087] In some embodiments, as shown in FIG. 8, the power taking controller 100 further includes a power supply unit 40, an input end of the power supply unit 40 being connected with an output end of the voltage conversion unit 10, and an output end of the power supply unit 40 being connected with a power supply end of the control unit 30, the power supply unit 40 being configured to generate a power supply voltage according to the output voltage of the voltage conversion unit 10 to supply power to the control unit 30.

[0088] That is, the output voltage of the voltage conversion unit 10 cannot meet the power supply requirement of the control unit 30, therefore, the power supply unit 40 can generate the power supply voltage of the control unit 30 according to the output voltage of the voltage conversion unit 10, and provide the power supply voltage to the control unit 30 to supply power to the control unit 30, so that an additional power supply is not needed to supply power to the control unit 30.

[0089] In some embodiments, as shown in FIG. 8, the power supply unit 40 comprises: a first capacitor C1 and a linear voltage regulator 41, wherein one end of the first capacitor C1 is connected to the output end of the voltage conversion unit 10, the other end of the first capacitor C1 is connected to the ground pin, and the first capacitor C1 is configured to provide power when the switching unit 20 switches; the input end of the linear voltage regulator 41 is connected to the output end of the voltage conversion unit 10 and the one end of the first capacitor C1 respectively, and the output end of the linear voltage regulator 41 is connected to the power supply end of the control unit 30, and the linear voltage regulator 41 is configured to generate a supply voltage from the output voltage of the voltage conversion unit 10 and provide the supply voltage to the control unit 30.

[0090] Specifically, the linear voltage regulator 41 generates a supply voltage according to the output voltage. For example, assuming that the output voltage of the voltage conversion unit 10 is 5V and the supply voltage of the control unit 30 is 3.3V, the linear voltage regulator 41 can generate a 3.3V voltage from the 5V voltage to supply power to the control unit 30. The first capacitor C1 can store the power output by the voltage conversion unit 10, so that when the switching unit 20 switches, the first capacitor C1 can provide power to the linear voltage regulator 41, so that the linear voltage regulator 41 can always output the supply voltage.

[0091] It should be noted that the first capacitor C1 can be a large-capacity capacitor or a super capacitor, which is not limited here.

[0092] In the above embodiment, the first capacitor can store power, so that when the switching unit switches, the first capacitor can provide power, thereby ensuring that the linear voltage regulator always has power input, so that the linear voltage regulator can always output the supply voltage, thereby improving the reliability of the power controller.

[0093] In summary, the power taking controller according to the embodiments of the present disclosure comprises a voltage conversion unit, a switching unit and a control unit, wherein the input end of the voltage conversion unit is adapted to be connected to the positive electrode of the battery, the output end of the voltage conversion unit is adapted to be connected to the external device, the voltage conversion unit is configured to supply power to the external device according to the battery voltage, the input end of the switching unit is connected to the ground pin of the voltage conversion unit, the first output end of the switching unit is adapted to be connected to the negative electrode of the battery, and the second output end of the switching unit is adapted to be connected to the power negative electrode of the battery management system, wherein the battery management system is adapted to protect the battery, the control unit is connected to the switching unit, and the control unit is configured to control the switching unit to switch the ground pin to be connected to the negative electrode of the battery when the ground pin is connected to the power negative electrode and it is determined that the battery management system protects the battery. Thus, when the ground pin is connected to the power negative electrode, the power taking mode of the external device is the negative electrode of the battery management system, and when the battery management system protects the battery, the battery management system will cut off the connection between the power negative electrode and the negative electrode of the battery. At this time, the control unit controls the switching unit to switch the ground pin to be connected to the negative electrode of the battery, so that the power taking mode of the external device is switched to the negative electrode of the battery, and uninterrupted power supply to the external device is realized, so as not to affect the normal operation of the external device.

[0094] Corresponding to the above-mentioned embodiments, the embodiments of the present disclosure also provide a power supply device. As shown in FIG. 9, the power supply device 1000 comprises the power taking controller 100 of any one of the foregoing embodiments.

[0095] The power supply device according to the embodiments of the present disclosure, through the power taking controller described above, switches the power taking mode of the external device from the power negative electrode of the battery management system to the negative electrode of the battery when the battery management system protects the battery, realizes uninterrupted power supply to the external device, and thus does not affect the normal operation of the external device.

[0096] It should be noted that the logical and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a list of executable instructions for implementing logic functions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor- containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions, or a combination of the above. For the purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a product of the manufacturing and / or processing, and / or a combination of such products. The computer-readable medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via the optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in the computer memory.

[0097] It should be understood that portions of the present disclosure can be implemented in hardware, software, firmware, or combinations thereof. In the above-described embodiments, a number of steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0098] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0099] In addition, the terms "first", "second", and the like used in the embodiments of the present disclosure are only used for descriptive purposes, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined with the terms "first", "second", and the like in the embodiments of the present disclosure can explicitly or implicitly indicate that at least one of the features is included in the embodiments. In the description of the present disclosure, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, etc., unless otherwise specifically limited in the embodiments.

[0100] In the present disclosure, unless otherwise specifically defined or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integral, which can be understood, or mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific implementation.

[0101] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A power taking controller, comprising: a voltage conversion unit, an input end of the voltage conversion unit being adapted to be connected to a positive electrode of a battery, an output end of the voltage conversion unit being adapted to be connected to an external device, the voltage conversion unit being configured to perform voltage conversion on a battery voltage to generate a power supply voltage and provide the power supply voltage to the external device to supply power to the external device; a switching unit, an input end of the switching unit being connected to a ground pin of the voltage conversion unit, a first output end of the switching unit being adapted to be connected to a negative electrode of the battery, a second output end of the switching unit being adapted to be connected to a power supply negative electrode of a battery management system, wherein the battery management system is adapted to be connected to a load; a control unit, the control unit being connected to the switching unit, the control unit being configured to control the switching unit to switch the ground pin to be connected to the negative electrode of the battery in a case where the ground pin is connected to the power supply negative electrode and it is determined that the battery management system protects the battery.

2. The power take-off controller of claim 1, wherein, The switching unit comprises: a first switching device, one end of the first switching device being connected to the ground pin, the other end of the first switching device being connected to the power supply negative electrode; a first driving module, an input end of the first driving module being connected to a first output end of the control unit, an output end of the first driving module being connected to a control end of the first switching device, the first driving module being configured to drive the first switching device to be turned on according to a first control signal of the control unit; a second switching device, one end of the second switching device being connected to the ground pin, the other end of the second switching device being connected to the negative electrode of the battery; a second driving module, an input end of the second driving module being connected to a second output end of the control unit, an output end of the second driving module being connected to a control end of the second switching device, the second driving module being configured to drive the second switching device to be turned on according to a second control signal of the control unit.

3. The power take-off controller of claim 2, wherein, The first driving module and the second driving module respectively comprise: a first resistor, one end of the first resistor being an input end of the corresponding driving module, a first switch tube, a control end of the first switch tube being connected to the other end of the first resistor, a second end of the first switch tube being grounded; a second resistor, one end of the second resistor being connected to the control end of the first switch tube, the other end of the second resistor being connected to the second end of the first switch tube; a second switch tube, a control end of the second switch tube being connected to a first end of the first switch tube and having a first node, a first end of the second switch tube being adapted to input a preset power supply, a second end of the second switch tube being an output end of the corresponding driving module; a third resistor, one end of the third resistor being connected to the control end of the second switch tube, the other end of the third resistor being connected to the first node.

4. The power draw controller of claim 3, wherein, The first switch tube is a triode, and the second switch tube is a MOS tube.

5. The power draw controller of claim 2, wherein, The switching unit further comprises: A first isolation transmission module is arranged between the output end of the first driving module and the control end of the first switch device, and is configured to isolate and transmit the driving signal of the first driving module to the control end of the first switch device. A second isolation transmission module is arranged between the output end of the second driving module and the control end of the second switch device, and is configured to isolate and transmit the driving signal of the second driving module to the control end of the second switch device.

6. The power draw controller of claim 2, wherein, The first switch device and the second switch device are MOS tubes.

7. The power take-off controller of claim 6, wherein, The switching unit further comprises: A first blocking device, an input end of the first blocking device being connected with the ground pin, and an output end of the first blocking device being connected with one end of the first switch device; A second blocking device, an input end of the second blocking device being connected with the ground pin, and an output end of the second blocking device being connected with one end of the second switch device.

8. The power take-off controller of claim 7, wherein, The first blocking device and the second blocking device are diodes, an anode of the diode being the input end of the corresponding blocking device, and a cathode of the diode being the output end of the corresponding blocking device.

9. The power take-off controller of any one of claims 1-8, wherein, In the case that the battery management system has a communication function, the control unit is adapted to be in communication connection with the battery management system, and is configured to determine that the battery management system protects the battery in the case that a protection signal sent by the battery management system is received.

10. The power take-off controller of claim 9, wherein, The control unit is further configured to control the switching unit to switch the ground pin to be in communication with the power supply negative electrode in the case that a release signal sent by the battery management system is received.

11. The power take-off controller of any one of claims 1-8, wherein, The control unit is adapted to be connected with the battery positive electrode, and is configured to sample the voltage between the battery positive electrode and the power supply negative electrode to obtain a sampling voltage in the case that the ground pin is in communication with the power supply negative electrode, and determine that the battery management system protects the battery in the case that the sampling voltage does not satisfy the voltage range of the battery.

12. The power take-off controller of claim 11, wherein, The control unit is further configured to control the switching unit to switch the ground pin to be in communication with the power supply negative electrode at a preset frequency in the case that the ground pin is in communication with the battery negative electrode, and control the switching unit to switch the ground pin to be in communication with the power supply negative electrode in the case that the sampling voltage satisfies the voltage range.

13. The power draw controller of claim 1, wherein, Further comprising: A power supply unit, an input end of the power supply unit being connected with the output end of the voltage conversion unit, and an output end of the power supply unit being connected with the power supply end of the control unit, the power supply unit being configured to generate a power supply voltage according to the output voltage of the voltage conversion unit to supply power to the control unit.

14. The power take-off controller of claim 13, wherein, The power supply unit comprises: A first capacitor, one end of the first capacitor being connected with the output end of the voltage conversion unit, and the other end of the first capacitor being connected with the ground pin, the first capacitor being configured to provide electric energy when the switching unit switches. a linear voltage stabilizer, an input end of the linear voltage stabilizer being connected with an output end of the voltage conversion unit and one end of the first capacitor respectively, an output end of the linear voltage stabilizer being connected with a power supply end of the control unit, the linear voltage stabilizer being configured to generate the power supply voltage according to the output voltage of the voltage conversion unit or the electric energy provided by the first capacitor, and provide the power supply voltage to the control unit.

15. A power supply device comprising the power-taking controller according to any one of claims 1-14.

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