Power taking controller and power supply device

Abstract

The invention discloses a power taking controller and a power supply device, and the power taking controller comprises a voltage conversion unit, the input end of the voltage conversion unit is suitable for being connected with the positive electrode of a battery, the output end of the voltage conversion unit is suitable for being connected with external equipment, and the voltage conversion unit is configured to generate a power supply according to the voltage of the battery, the power supply is used for supplying power to external equipment; the input end of the switching unit is connected with the ground pin of the voltage conversion unit, the first output end of the switching unit is suitable for being connected with the negative electrode of the battery, the second output end of the switching unit is suitable for being connected with the negative electrode of a power supply of a battery management system, and the battery management system is suitable for being connected with a load; and the control unit is connected with the switching unit, and the control unit is configured to control the switching unit to switch the ground pin to be communicated with the negative electrode of the battery under the condition that the ground pin is communicated with the negative electrode of the power supply and the battery management system is determined to protect the battery. According to the power taking controller, uninterrupted power supply for external equipment is realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a power supply controller and a power supply device. Background Art

[0002] With the development of intelligence, battery packs not only need to provide electrical energy, but also need to communicate with external devices to achieve more functions. The power supply methods of these auxiliary functions will affect the function and life of the overall battery pack and the user experience. In the related technology, there are two ways to draw power for auxiliary function circuits, one is to draw power from the negative pole of the battery, and the other is to draw power from the negative pole of the power management system. The circuit design of drawing power from the negative pole of the battery is simple, but lacks a protection mechanism. When the battery status is abnormal, the power supply of the auxiliary function circuit cannot be cut off. Therefore, there are safety hazards in the circuit. Drawing power from the negative pole of the power management system can improve the safety of the auxiliary function circuit, but when the power management system cuts off the negative pole power supply, the auxiliary function circuit will be powered off, thereby affecting the normal operation of the equipment. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to provide a power taking controller, which switches the power taking mode of the external device from the negative pole of the power supply of the battery management system to the negative pole of the battery when the battery management system protects the battery, thereby realizing uninterrupted power supply to the external device, which will not affect the normal operation of the external device.

[0004] A second objective of the present invention is to provide a power supply device.

[0005] To achieve the above-mentioned purpose, a power supply controller is proposed according to an embodiment of the first aspect of the present invention, comprising: a voltage conversion unit, wherein the input end of the voltage conversion unit is suitable for connecting to the positive pole of the battery, the output end of the voltage conversion unit is suitable for connecting to an external device, and the voltage conversion unit 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 to power the external device; a switching unit, wherein 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 suitable for connecting to the negative pole of the battery, and the second output end of the switching unit is suitable for connecting to the negative pole of the power supply of the battery management system, wherein the battery management system is suitable for connecting to a load; a control unit, wherein 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 pole of the battery when the ground pin is connected to the negative pole of the power supply and it is determined that the battery management system protects the battery.

[0006] According to an embodiment of the present invention, a power taking controller includes a voltage conversion unit, a switching unit and a control unit, wherein the input end of the voltage conversion unit is suitable for connecting to the positive pole of the battery, the output end of the voltage conversion unit is suitable for connecting to an external device, the voltage conversion unit 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 to power 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 suitable for connecting to the negative pole of the battery, and the second output end of the switching unit is suitable for connecting to the negative pole of the power supply of the battery management system, wherein the battery management system is suitable for connecting to a 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 pole of the battery when the ground pin is connected to the negative pole of the power supply and it is determined that the battery management system protects the battery. Therefore, when the ground pin is connected to the negative pole of the power supply, the external device draws power from the negative pole of the battery management system. When the battery management system protects the battery, the battery management system will cut off the connection between the negative pole of the power supply and the negative pole of the battery. At this time, the control unit controls the switching unit to switch the ground pin to the negative pole of the battery, so that the external device draws power from the negative pole of the battery, thereby achieving uninterrupted power supply to the external device, thereby not affecting the normal operation of the external device.

[0007] According to one embodiment of the present invention, the switching unit includes: a first switching device, one end of the first switching device is connected to the ground pin, and the other end of the first switching device is connected to the negative electrode of the power supply; a first driving module, the input end of the first driving module is connected to the first output end of the control unit, the output end of the first driving module is connected to the control end of the first switching device, and the first driving module is configured to drive the first switching device to turn on according to a first control signal of the control unit; a second switching device, one end of the second switching device is connected to the ground pin, and the other end of the second switching device is connected to the negative electrode of the battery; a second driving module, the input end of the second driving module is connected to the second output end of the control unit, the output end of the second driving module is connected to the control end of the second switching device, and the second driving module is configured to drive the second switching device to turn on according to a second control signal of the control unit.

[0008] According to one embodiment of the present invention, the first driving module and the second driving module respectively include: a first resistor, one end of the first resistor is the input end of the corresponding driving module, a first switch tube, the control end of the first switch tube is connected to the other end of the first resistor, and the second end of the first switch tube is grounded; a second resistor, one end of the second resistor is connected to the control end of the first switch tube, and the other end of the second resistor is connected to the second end of the first switch tube; a second switch tube, the control end of the second switch tube is connected to the first end of the first switch tube and has a first node, the first end of the second switch tube is suitable for inputting a preset power supply, and the second end of the second switch tube is the output end of the corresponding driving module; a third resistor, one end of the third resistor is connected to the control end of the second switch tube, and the other end of the third resistor is connected to the first node.

[0009] According to an embodiment of the present invention, the first switch tube is a triode, and the second switch tube is a MOS tube.

[0010] According to one embodiment of the present invention, the switching unit also includes: a first isolation transmission module, which is arranged between the output end of the first driving module and the control end of the first switching device, and the first isolation transmission module is configured to isolate and transmit the driving signal of the first driving module to the control end of the first switching device; a second isolation transmission module, which is arranged between the output end of the second driving module and the control end of the second switching device, and the second isolation transmission module is configured to isolate and transmit the driving signal of the second driving module to the control end of the second switching device.

[0011] According to an embodiment of the present invention, the first switch device and the second switch device are MOS tubes respectively.

[0012] According to one embodiment of the present invention, the switching unit also includes: a first blocking device, the input end of the first blocking device is connected to the ground pin, and the output end of the first blocking device is connected to one end of the first switching device; a second blocking device, the input end of the second blocking device is connected to the ground pin, and the output end of the second blocking device is connected to one end of the second switching device.

[0013] According to an embodiment of the present invention, the first blocking device and the second blocking device are diodes respectively, the anode of the diode is the input terminal of the corresponding blocking device, and the cathode of the diode is the output terminal of the corresponding blocking device.

[0014] According to one embodiment of the present invention, when the battery management system has a communication function, the control unit is suitable for communicating with the battery management system, and the control unit is configured to determine that the battery management system protects the battery when receiving a protection signal sent by the battery management system.

[0015] According to an embodiment of the present invention, the control unit is further configured to control the switching unit to switch the ground pin to be connected to the negative pole of the power supply when receiving a release signal sent by the battery management system.

[0016] According to one embodiment of the present invention, the control unit is suitable for connecting to the positive electrode of the battery. The control unit is configured to sample the voltage between the positive electrode of the battery and the negative electrode of the power supply when the ground pin is connected to the negative electrode of the power supply to obtain a sampled voltage. When the sampled voltage does not meet the voltage range of the battery, the battery management system is determined to protect the battery.

[0017] According to one embodiment of the present invention, the control unit is also configured to control the switching unit to switch the ground pin to be connected to the negative pole of the power supply according to a preset frequency when the ground pin is connected to the negative pole of the battery, and to control the switching unit to switch the ground pin to be connected to the negative pole of the power supply when the sampled voltage satisfies the voltage range.

[0018] According to one embodiment of the present invention, the power supply controller also includes: a power supply unit, the input end of the power supply unit is connected to the output end of the voltage conversion unit, the output end of the power supply unit is connected to the power supply end of the control unit, and the power supply unit is configured to generate a supply voltage according to the output voltage of the voltage conversion unit to power the control unit.

[0019] According to one embodiment of the present invention, the power supply unit includes: a first capacitor, one end of the first capacitor is connected to the output end of the voltage conversion unit, the other end of the first capacitor is connected to the ground pin, and the first capacitor is configured to provide electrical energy when the switching unit is switched; a linear regulator, the input end of the linear regulator is respectively connected to the output end of the voltage conversion unit and one end of the first capacitor, the output end of the linear regulator is connected to the power supply end of the control unit, and the linear regulator is configured to generate a supply voltage according to the output voltage of the voltage conversion unit or the electrical energy provided by the first capacitor, and provide the supply voltage to the control unit.

[0020] To achieve the above objective, a power supply device is provided according to a second aspect of the present invention, comprising a power taking controller according to any one of the above embodiments.

[0021] According to the power supply device of an embodiment of the present invention, through the above-mentioned power supply controller, when the battery management system protects the battery, the power supply method of the external device is switched from the negative power pole of the battery management system to the negative pole of the battery, thereby realizing uninterrupted power supply to the external device, which will not affect the normal operation of the external device.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the structure of a power taking controller according to an embodiment of the present invention;

[0024] Figure 2 is a circuit diagram of a first driving module and a first switching device according to an embodiment of the present invention;

[0025] Figure 3 is a circuit diagram of a second driving module and a second switching device according to an embodiment of the present invention;

[0026] Figure 4 is a circuit diagram of a first driving module and a first switching device according to another embodiment of the present invention;

[0027] Figure 5 is a circuit diagram of a second driving module and a second switching device according to another embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of the structure of a power taking controller according to another embodiment of the present invention;

[0029] Figure 7 is a schematic diagram of the structure of a power taking controller according to another embodiment of the present invention;

[0030] Figure 8 is a schematic structural diagram of a power taking controller with a power supply unit according to an embodiment of the present invention;

[0031] Fig. 9 is a schematic structural diagram of a power supply device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent 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 be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] It should be noted that this application is made based on the inventor's understanding and research of the following issues:

[0034] In the related art, there are two ways to obtain power for auxiliary function circuits: one is to obtain power from the negative electrode of the battery, and the other is to obtain power from the negative electrode of the power management system.

[0035] Taking power from the negative electrode of the battery can reduce the intermediate links in the circuit, making the circuit design relatively simple and reducing the circuit cost. In addition, it can also ensure 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:

[0036] 1. Lack of protection mechanism: The battery management system can monitor the battery status and cut off the power supply when the battery is abnormal, thereby protecting the safety of the battery and circuit. However, it is impossible to cut off the power supply by directly drawing power from the negative electrode of the battery;

[0037] 2. Unable to monitor the battery status: Because there is no monitoring of the battery management system, the power circuit cannot know the accurate battery status, which may cause excessive discharge, damage, and even safety problems.

[0038] 3. Lack of intelligent management: The battery management system can not only provide protection, but also realize intelligent management of the battery, such as optimizing charging and discharging strategies, extending battery life, etc. However, these functions cannot be achieved by directly drawing power from the negative electrode of the battery;

[0039] 4. Safety hazards: If the battery has safety hazards such as internal short circuit, overcharging, over-discharging, etc., drawing power directly from the negative electrode of the battery may be affected by these hazards, thus causing safety accidents.

[0040] Drawing 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 overcharging, overdischarging, and short circuits, thereby improving circuit safety and achieving more efficient and reliable energy utilization. However, this power-drawing method has the following problems:

[0041] 1. Strong dependence on the battery management system: Taking power from the negative electrode 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;

[0042] 2. Device power failure: Since the connection between the negative terminal of the power management system and the negative terminal of the battery is cut off, the external device will lose connection with the battery and will be powered off immediately. This may affect the normal operation of the device, especially when the device requires continuous power supply;

[0043] 3. Equipment damage: Sudden power outages may cause damage to equipment, especially for those devices that are not designed with good power-off protection mechanisms. Such damage may include data loss, hardware failure, or other unpredictable problems.

[0044] Based on this, an embodiment of the present invention provides a power supply controller and a power supply device. When the battery management system protects the battery, the power supply method of the external device is switched from the negative pole of the battery management system to the negative pole of the battery, thereby achieving uninterrupted power supply to the external device without affecting the normal operation of the external device.

[0045] The following describes a power supply controller and a power supply device according to an embodiment of the present invention with reference to the accompanying drawings.

[0046] Figure 1 FIG. 1 is a schematic diagram of a power taking controller according to an embodiment of the present invention. Figure 1 As shown, the power taking controller 100 includes: a voltage conversion unit 10 , a switching unit 20 and a control unit 30 .

[0047] Among them, the input end of the voltage conversion unit 10 is suitable for connecting to the positive electrode B+ of the battery, the output end of the voltage conversion unit 10 is suitable for connecting 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 power 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 suitable for connecting to the negative electrode B- of the battery, and the second output end of the switching unit 20 is suitable for connecting to the negative electrode P- of the power supply of the battery management system 300, wherein the battery management system 300 is suitable for connecting 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 connect to the negative electrode B- of the battery when the ground pin is connected to the negative electrode P- of the power supply and it is determined that the battery management system 300 protects the battery 400.

[0048] Specifically, the negative power electrode P- of the battery management system 300 is connected to the negative battery electrode B- through the switch device 301. The battery management system 300 monitors the state of the battery 400, and controls the switch device 301 to disconnect when the state of the battery 400 is abnormal, so as to protect the battery 400. When the state of the battery 400 is normal, the switch device 301 between the negative battery electrode B- and the negative power electrode P- is turned on, the ground pin of the voltage conversion unit 10 is connected to the negative power electrode P-, and the external device 200 draws power from the negative power electrode P-. At this time, the battery management system 300 can protect the power taking controller 100 and the external device 200. When the battery 400 is in an abnormal state, the battery management system 300 protects the battery 400 by controlling the switch device 301 to disconnect, and the connection between the negative pole P- of the power supply and the negative pole B- of the battery is disconnected. Therefore, the control switching unit 20 switches the ground pin to be connected to the negative pole B- of the battery, and the voltage conversion unit 10 draws power from the negative pole B- of the battery. The voltage conversion unit 10 can continuously generate power supply to power the external device 200, thereby realizing uninterrupted power supply to the external device 200.

[0049] It should be noted that the power taking controller 100 of this embodiment can be applied to a power supply device, and the external device 200 can be a light board, a communication module, etc. inside the power supply device. The load of this embodiment is the load of the power supply device, and the negative power electrode P- of the battery management system 300 can also be connected to the negative electrode of the charger (not shown).

[0050] Furthermore, the power taking controller 100 also includes a control unit 30 that controls the external device 200 to enter a low power consumption state after controlling the switching unit 20 to switch the ground pin to be connected to the negative electrode B− of the battery, thereby reducing the loss of the battery 400 .

[0051] In an optional implementation, the voltage conversion unit 10 may be a power management chip, which may generate different voltages, such as 12V and 5V, according to the voltage of the battery 400 to power the external device 200. Furthermore, the ground pin of the external device 200 is connected to the ground pin of the voltage conversion unit 10.

[0052] In the above embodiment, when the battery is in normal condition, the ground pin is connected to the negative pole of the power supply, and the battery management system can protect the circuit to ensure the safety of the circuit; when the battery is in abnormal condition, the control unit controls the switching unit to switch the ground pin to be connected to the negative pole of the battery, so that the power supply mode of the external device is switched to the negative pole of the battery, thereby realizing uninterrupted power supply to the external device, which will not affect the normal operation of the external device, and further avoid the external device from being damaged due to power interruption.

[0053] In some embodiments, Figure 2 and Figure 3 As shown, the switching unit 20 includes: a first switch device K1, a first driving module 21, a second switch device K2 and a second driving module 22, wherein one end of the first switch device K1 is connected to the ground pin PGND, and the other end of the first switch device K1 is connected to the negative electrode P- of the power supply; the input end of the first driving module 21 is connected to the first output end of the control unit 30, the output end of the first driving module 21 is connected to the control end of the first switch device K1, and the first driving module 21 is configured to drive the first switch device K1 to turn on according to the first control signal of the control unit 30; one end of the second switch device K2 is connected to the ground pin PGND, and the other end of the second switch device K2 is connected to the negative electrode B- of the battery; the input end of the second driving module 22 is connected to the second output end of the control unit 30, the output end of the second driving module 22 is connected to the control end of the second switch device K2, and the second driving module 22 is configured to drive the second switch device K2 to turn on according to the second control signal of the control unit 30.

[0054] 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 switch device K1 to turn on according to the first control signal, and the second switch device K2 is in an off state. When the battery management system 300 protects the battery 400, the control unit 30 generates the second control signal and stops generating the first control signal, the second driving module 22 drives the second switch device K2 to turn on, and the first switch device K1 is in an off state.

[0055] In some embodiments, Figure 2 and Figure 3 As shown, the first driving module 21 and the second driving module 22 respectively include: 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 to 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 to the control end of the first switch tube Q1, and the other end of the second resistor R2 is connected to the second end of the first switch tube Q1; the control end of the second switch tube Q2 is connected to 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 suitable for inputting 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 to the control end of the second switch tube Q2, and the other end of the third resistor R3 is connected to the first node J1.

[0056] Specifically, the circuit structures of the first driving module 21 and the second driving module 22 are the same. Figure 2The circuit diagram of the first driving module 21 is shown. The first driving module 21 includes 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 first driving module 21, the control end of the first switch tube Q1 is connected to the other end of the first resistor R1, the second end of the first switch tube Q1 is grounded, one end of the second resistor R2 is connected to the control end of the first switch tube Q1, the other end of the second resistor R2 is connected to the second end of the first switch tube Q1, the control end of the second switch tube Q2 is connected to 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 suitable for inputting a preset power supply, the second end of the second switch tube Q2 is the 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 tube 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 tube Q1 through the first resistor R1 to turn on the first switch tube Q1. After the first switch tube Q1 is turned on, the second switch tube Q2 is turned on. After the second switch tube Q2 is turned on, a first drive signal for the first switch device K1 is generated to turn on the first switch device K1.

[0057] Figure 3 The circuit diagram of the second driving module 22 is shown. The second driving module 22 includes a fourth resistor R4, a third switch tube Q3, a fifth resistor R5, a fourth switch tube Q4 and a sixth resistor R6, wherein one end of the fourth resistor R4 is the input end of the second driving module 22, the control end of the third switch tube Q3 is connected to the other end of the fourth resistor R4, the second end of the third switch tube Q3 is grounded, one end of the fifth resistor R5 is connected to the control end of the third switch tube Q3, the other end of the fifth resistor R5 is connected to the second end of the third switch tube Q3, the control end of the fourth switch tube Q4 is connected to the first end of the third switch tube Q3 and has a second node J2, the first end of the fourth switch tube Q4 is suitable for inputting a preset power supply, the second end of the fourth switch tube Q4 is the 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 tube Q4, and the other end of the sixth resistor R6 is connected to the second node J2. Control unit 30

[0058] In some embodiments, Figure 2 and Figure 3 As shown, the first switch tube Q1 is a triode, and the second switch tube Q2 is a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube.

[0059] by Figure 2As shown in the example, the first switch tube Q1 is an NPN transistor, 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 the off state, and the second resistor R2 pulls the control end of the second switch tube Q2 to a high level, so the second switch tube Q2 is in the off state, the first drive module 21 cannot generate the first drive signal, and the first switch device K1 is in the off state. When the control unit 30 outputs the first control signal, the first switch tube Q1 is turned on, and after the first switch tube Q1 is turned on, the control end of the second switch tube Q2 is pulled to a low level, and the second switch tube Q2 is turned on. After the second switch tube Q2 is turned on, the preset power supply is provided to the first switch device K1, and the first switch device K1 is turned on.

[0060] It should be noted that the working mode of the second driving module 22 is the same as that of the first driving module 21 , and will not be described in detail here.

[0061] In some embodiments, Figure 2 and Figure 3 As shown, the first switch device K1 and the second switch device K2 are MOS tubes respectively.

[0062] Specifically, the first switch device K1 and the second switch device K2 can be NMOS (Negative Channel Metal Oxide Semiconductor, N-type metal oxide semiconductor) tubes. When the second switch tube Q2 is in the off state, the second switch tube Q2 cannot provide the preset power supply to the first switch device K1, so the first switch device K1 is in the off state; when the second switch tube Q2 is turned on, the second switch tube Q2 pulls the control end of the first switch device K1 to a high level, and the first switch device K1 is turned on. Similarly, when the fourth switch tube Q4 is in the off state, the fourth switch tube Q4 cannot provide the preset power supply to the second switch device K2, so the second switch device K2 is in the off state; when the fourth switch tube Q4 is turned on, the fourth switch tube Q4 pulls the control end of the second switch device K2 to a high level, and the second switch device K2 is turned on.

[0063] It should be noted that the first switch device K1 and the second switch device K2 are not limited to MOS tubes, and may also be other switch devices, such as relays, which are not specifically limited here.

[0064] In the above embodiment, the first switch device and the second switch device are MOS tubes respectively. Since the switching speed of the MOS tube is relatively fast, the switching unit can switch the connection mode of the ground pin of the voltage conversion unit in time.

[0065] In some embodiments, Figure 4 and Figure 5 As shown, the switching unit 20 also includes: 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.

[0066] Specifically, when the switching unit 20 switches the connection mode of the ground pin PGND of the voltage conversion unit 10, the control terminal voltages of the first switch device K1 and the second switch 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 signal. Therefore, the first isolation transmission module 23 can output a stable electrical signal according to the driving signal of the first driving module 21 to drive the first switch device K1 to turn on, and the second isolation transmission module 24 can output a stable electrical signal according to the driving signal of the second driving module 22 to drive the second switch device K2 to turn on.

[0067] In an optional embodiment, if Figure 4 and Figure 5 As shown, the first isolation transmission module 23 includes a first isolation power chip 231, and the second isolation transmission module 24 includes a second isolation power chip 241. The positive input end of the first isolation power chip 231 is connected to the second end of the second switch tube Q2, the negative input end of the first isolation power chip 231 is connected to the positive input end of the first isolation power chip 231 through the second capacitor C2 and is grounded, the positive output end of the first isolation power chip 231 is connected to the control end of the first switch device K1, and the negative output end of the first isolation power chip 231 is connected to the positive output end of the first isolation power chip 231 and the negative electrode P- of the power supply through the third capacitor C3. When the second switch tube Q2 is turned on, the preset power supply is input to the positive input end of the first isolation power chip 231, so the positive output end of the first isolation power chip 231 outputs a voltage signal; when the second switch tube Q2 is turned off, there is no signal input to the positive input end of the first isolation power chip 231, so there is no signal output from the positive output end of the first isolation power chip 231.

[0068] The positive input terminal of the second isolated power chip 241 is connected to the second end of the fourth switch tube Q4, the negative input terminal of the second isolated power chip 241 is connected to the positive input terminal of the second isolated power chip 241 through the fourth capacitor C4 and is grounded, the positive output terminal of the second isolated power chip 241 is connected to the control terminal of the second switch device K2, and the negative output terminal of the second isolated power chip 241 is connected to the positive output terminal of the second isolated power chip 241 and the negative electrode B- of the battery through the fifth capacitor C5. When the fourth switch tube Q4 is turned on, the preset power input is input to the positive input terminal of the second isolated power chip 241, so the positive output terminal of the second isolated power chip 241 outputs a voltage signal; when the fourth switch tube Q4 is turned off, there is no signal input to the positive input terminal of the second isolated power chip 241, so there is no signal output from the positive output terminal of the second isolated power chip 241.

[0069] In the above embodiment, the first isolation transmission module and the second isolation transmission module are used to isolate and transmit the driving signals of the first driving module and the second driving module respectively, so as to avoid the situation that the control terminal voltage of the first switch device and the second switch device is unstable due to the change of the ground. Furthermore, because the first isolation transmission module and the second isolation 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, which can reduce the power consumption of the power taking controller, thereby reducing the loss of the battery.

[0070] In some embodiments, Figure 4 and Figure 5 As shown, the switching unit 20 also includes: a first blocking device 25 and a second blocking device 26, wherein the input end of the first blocking device 25 is connected to the ground pin PGND, and the output end of the first blocking device 25 is connected to one end of the first switch device K1; the input end of the second blocking device 26 is connected to the ground pin PGND, and the output end of the second blocking device 26 is connected to one end of the second switch device K2.

[0071] Specifically, Figure 4 and Figure 5As shown, in the case where 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 to the ground pin PGND, and the source of the first switch device K1 is connected to the negative power supply electrode P-, therefore, the cathode of the body diode of the first switch device K1 is connected to the ground pin PGND, and the anode of the body diode of the first switch device K1 is connected to the negative power supply electrode P-, the drain of the second switch device K2 is connected to the ground pin PGND, and the source of the second switch device K2 is connected to the negative battery electrode B-, therefore, the cathode of the body diode of the second switch device K2 is connected to the ground pin PGND, and the anode of the body diode of the second switch device K2 is connected to the negative battery electrode B-, therefore, the negative battery electrode B- and the negative power supply electrode P- may 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, a first blocking device 25 is added between the first switch device K1 and the ground pin PGND, and a second blocking device 26 is added between the second switch device K2 and the ground pin PGND to block the battery negative electrode B- and the power supply negative electrode P-.

[0072] Furthermore, in some embodiments, Figure 4 and Figure 5 As shown, 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.

[0073] It is understandable that if Figure 4 As shown, the first blocking device 25 is a first diode D1, the anode of the first diode D1 is connected to the ground pin PGND, and the cathode of the first diode D1 is connected to one end of the first switch device K1. Figure 5 As shown, the second blocking device 26 is a second diode D2, the anode of the second diode D2 is connected to the ground pin PGND, and the cathode of the second diode D2 is connected to 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, thereby preventing the negative electrode P- of the power supply and the negative electrode B- of the battery from being connected.

[0074] In the above embodiment, a first blocking device is added between the first switching device and the ground pin, and a second blocking device is added between the second switching device and the ground pin to block the electrical signal between the negative electrode of the power supply and the negative electrode of the battery, thereby preventing the negative electrode of the power supply and the negative electrode of the battery from being connected.

[0075] In some embodiments, Figure 6As shown, when the battery management system 300 has a communication function, the control unit 30 is suitable for communicating 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 when receiving a protection signal sent by the battery management system 300.

[0076] That is to say, when the battery management system 300 has a communication function, the battery management system 300 can be connected to the control unit 30 for communication. 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 determines that the battery management system 300 protects the battery 400, controls the first switch device K1 to be turned off, and controls the second switch device K2 to be turned on.

[0077] In some embodiments, the control unit 30 is further configured to control the switching unit 20 to switch the ground pin to be connected to the negative electrode P- of the power supply when receiving a release signal sent by the battery management system 300 .

[0078] Specifically, after determining that the battery 400 is in normal status, the battery management system 300 will stop protecting the battery 400. At this time, the battery management system 300 sends a release signal to the control unit 30. When the control unit 30 receives the contact signal, it controls the first switch device K1 to turn on and controls the second switch device K2 to turn off, so that the ground pin is connected to the negative pole P- of the power supply.

[0079] In the above embodiment, after the battery management system releases the protection state, the control unit controls the switching unit to switch to the negative pole of the power supply for power supply, so that the battery management system can continue to monitor the circuit, thereby improving the safety of the power supply controller.

[0080] In some embodiments, as shown in Figure 7, the control unit 30 is suitable for connecting to the positive electrode B+ of the battery. The control unit 30 is configured to sample the voltage between the positive electrode B+ of the battery and the negative electrode P- of the power supply when the ground pin PGND is connected to the negative electrode P- of the power supply to obtain a sampled voltage. When the sampled voltage does not meet the voltage range of the battery 400, it is determined that the battery management system 300 protects the battery 400.

[0081] 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 protecting the battery 400. Therefore, the control unit 30 is connected to the positive electrode B+ of the battery, and samples the voltage between the positive electrode B+ of the battery and the negative electrode P- of the power supply. If the sampled voltage meets the voltage range corresponding to the battery 400, it indicates that the negative electrode P- of the power supply is connected to the negative electrode B- of the battery. Therefore, the battery management system 300 does not perform protection, and there is no need to control the switching unit 20 to switch; if the sampled voltage does not meet the voltage range, the negative electrode P- of the power supply is disconnected from the negative electrode B- of the battery, and the battery management system 300 protects the battery 400, and it is necessary to control the switching unit 20 to switch.

[0082] In some embodiments, the control unit 30 is also configured to control the switching unit 20 to switch the ground pin to the negative pole P- of the power supply according to a preset frequency when the ground pin is connected to the negative pole B- of the battery, and to control the switching unit 20 to switch the ground pin to the negative pole P- of the power supply when the sampling voltage satisfies the voltage range.

[0083] 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 to sample the voltage between the battery positive electrode B+ and the power supply negative electrode P- to determine whether the battery management system 300 releases the protection. Because the voltage between the battery positive electrode B+ and the power supply negative electrode P- cannot be sampled when the ground pin is connected to the battery negative electrode B-, it is necessary to control the control switching unit 20 to switch the ground pin to the power supply negative electrode P- according to the preset frequency, so as to obtain the sampled voltage. If the sampled voltage meets the voltage range, it indicates that the battery management system 300 releases the protection, and the control switching unit 20 switches the ground pin to the power supply negative electrode P-; if the voltage does not meet the voltage range, it indicates that the battery management system 300 is still protecting the battery 400, so the ground pin continues to remain connected to the battery negative electrode B-.

[0084] It should be noted that in actual applications, different power supply methods can be selected according to actual needs. For example, when the battery management system 300 is not required for protection, the switching unit 20 can be directly controlled to switch the battery negative electrode B- to the ground pin. If the external device 200 needs to continue working, when the power supply negative electrode P- fails, the battery negative electrode B- can also be switched to be connected to the ground pin.

[0085] In some embodiments, Figure 8As shown, the power supply controller 100 also includes: a power supply unit 40, the input end of the power supply unit 40 is connected to the output end of the voltage conversion unit 10, the output end of the power supply unit 40 is connected to the power supply end of the control unit 30, and the power supply unit 40 is configured to generate a power supply voltage according to the output voltage of the voltage conversion unit 10 to power the control unit 30.

[0086] That is to say, 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 power the control unit 30. In this way, there is no need to set up an additional power supply to power the control unit 30.

[0087] In some embodiments, Figure 8 As shown, the power supply unit 40 includes: a first capacitor C1 and a linear regulator 41, wherein one end of the first capacitor C1 is connected to the output end of the voltage conversion unit 10, and the other end of the first capacitor C1 is connected to the ground pin, and the first capacitor C1 is configured to provide electric energy when the switching unit 20 switches; the input end of the linear regulator 41 is respectively connected to the output end of the voltage conversion unit 10 and one end of the first capacitor C1, and the output end of the linear regulator 41 is connected to the power supply end of the control unit 30, and the linear regulator 41 is configured to generate a power supply voltage from the output voltage of the voltage conversion unit 10, and provide the power supply voltage to the control unit 30.

[0088] Specifically, the linear regulator 41 generates a power supply voltage according to the output voltage. For example, assuming that the output voltage of the voltage conversion unit 10 is 5V and the power supply voltage of the control unit 30 is 3.3V, the linear regulator 41 can generate a 3.3V voltage according to the 5V voltage to supply power to the control unit 30. The first capacitor C1 can store the electric energy output by the voltage conversion unit 10, so that when the switching unit 20 switches, the first capacitor C1 can provide electric energy to the linear regulator 41, so that the linear regulator 41 can always output the power supply voltage.

[0089] It should be noted that the first capacitor C1 may be a large-capacity capacitor or a super capacitor, which is not specifically limited here.

[0090] In the above embodiment, the first capacitor can store electrical energy, so that when the switching unit is switched, the first capacitor can provide electrical energy, thereby ensuring that the linear regulator always has electrical energy input, so that the linear regulator can always output the supply voltage, thereby improving the reliability of the power supply controller.

[0091] In summary, according to an embodiment of the present invention, the power taking controller includes a voltage conversion unit, a switching unit and a control unit, wherein the input end of the voltage conversion unit is suitable for connecting to the positive electrode of the battery, the output end of the voltage conversion unit is suitable for connecting to an 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 suitable for connecting to the negative electrode of the battery, and the second output end of the switching unit is suitable for connecting to the negative electrode of the power supply of the battery management system, wherein the battery management system is suitable for protecting 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 connect to the negative electrode of the battery when the ground pin is connected to the negative electrode of the power supply and it is determined that the battery management system protects the battery. Thus, when the ground pin is connected to the negative electrode of the power supply, 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 negative electrode of the power supply and the negative electrode of the battery. At this time, the control unit controls the switching unit to switch the ground pin to connect 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, thereby realizing uninterrupted power supply to the external device, thereby not affecting the normal operation of the external device.

[0092] Corresponding to the above embodiment, the embodiment of the present invention further provides a power supply device. Fig. 9 As shown, the power supply device 1000 includes the power taking controller 100 of any of the aforementioned embodiments.

[0093] According to the power supply device of an embodiment of the present invention, through the above-mentioned power supply controller, when the battery management system protects the battery, the power supply method of the external device is switched from the negative power pole of the battery management system to the negative pole of the battery, thereby realizing uninterrupted power supply to the external device, which will not affect the normal operation of the external device.

[0094] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0095] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0098] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific implementation situation.

[0099] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A power taking controller, characterized in that: include: a voltage conversion unit, wherein the input end of the voltage conversion unit is suitable for connecting to the positive electrode of the battery, the output end of the voltage conversion unit is suitable for connecting to an external device, and the voltage conversion unit 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 to power the external device; A switching unit, wherein an input end of the switching unit is connected to a ground pin of the voltage conversion unit, a first output end of the switching unit is suitable for connecting to a negative electrode of a battery, and a second output end of the switching unit is suitable for connecting to a negative electrode of a power supply of a battery management system, wherein the battery management system is suitable for connecting to a load; A 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 negative electrode of the power supply and it is determined that the battery management system protects the battery.

2. The power taking controller according to claim 1, characterized in that: The switching unit comprises: A first switch device, one end of the first switch device is connected to the ground pin, and the other end of the first switch device is connected to the negative electrode of the power supply; a first driving module, wherein an input end of the first driving module is connected to a first output end of the control unit, an output end of the first driving module is connected to a control end of the first switching device, and the first driving module is configured to drive the first switching device to turn on according to a first control signal of the control unit; A second switch device, one end of the second switch device is connected to the ground pin, and the other end of the second switch device is connected to the negative electrode of the battery; A second driving module, wherein the input end of the second driving module is connected to the second output end of the control unit, the output end of the second driving module is connected to the control end of the second switching device, and the second driving module is configured to drive the second switching device to turn on according to a second control signal of the control unit.

3. The power taking controller according to claim 2, characterized in that: The first driving module and the second driving module respectively include: a first resistor, one end of which is the input end of the corresponding driving module, A first switch tube, wherein a control end of the first switch tube is connected to the other end of the first resistor, and a second end of the first switch tube is grounded; a second resistor, one end of the second resistor being connected to the control end of the first switch tube, and the other end of the second resistor being connected to the second end of the first switch tube; A second switch tube, wherein a control end of the second switch tube is connected to a first end of the first switch tube and has a first node, the first end of the second switch tube is suitable for inputting a preset power supply, and the second end of the second switch tube is an output end of a corresponding driving module; A third resistor, one end of the third resistor is connected to the control end of the second switch tube, and the other end of the third resistor is connected to the first node.

4. The power taking controller according to claim 3, characterized in that: The first switch tube is a triode, and the second switch tube is a MOS tube.

5. The power taking controller according to claim 2, characterized in that: The switching unit also includes: a first isolation transmission module, the first isolation transmission module being arranged between the output end of the first driving module and the control end of the first switching device, the first isolation transmission module being configured to isolate and transmit the driving signal of the first driving module to the control end of the first switching device; A second isolation transmission module is provided between the output end of the second driving module and the control end of the second switching device, and the second isolation transmission module is configured to isolate and transmit the driving signal of the second driving module to the control end of the second switching device.

6. The power taking controller according to claim 2, characterized in that: The first switch device and the second switch device are MOS tubes respectively.

7. The power taking controller according to claim 6, characterized in that: The switching unit also includes: a first blocking device, wherein an input end of the first blocking device is connected to the ground pin, and an output end of the first blocking device is connected to one end of the first switching device; A second blocking device, wherein an input end of the second blocking device is connected to the ground pin, and an output end of the second blocking device is connected to one end of the second switch device.

8. The power taking controller according to claim 7, characterized in that: The first blocking device and the second blocking device 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.

9. The power taking controller according to any one of claims 1 to 8, characterized in that: In the case where the battery management system has a communication function, the control unit is suitable for being communicatively connected with the battery management system, and the control unit is configured to determine that the battery management system protects the battery when receiving a protection signal sent by the battery management system.

10. The power taking controller according to claim 9, characterized in that: The control unit is further configured to control the switching unit to switch the ground pin to be connected to the negative pole of the power supply when receiving a release signal sent by the battery management system.

11. The power taking controller according to any one of claims 1 to 8, characterized in that: The control unit is suitable for connecting to the positive electrode of the battery. The control unit is configured to sample the voltage between the positive electrode of the battery and the negative electrode of the power supply when the ground pin is connected to the negative electrode of the power supply to obtain a sampled voltage. When the sampled voltage does not meet the voltage range of the battery, the control unit determines that the battery management system protects the battery.

12. The power taking controller according to claim 11, characterized in that: The control unit is further configured to control the switching unit to switch the ground pin to be connected to the negative pole of the power supply according to a preset frequency when the ground pin is connected to the negative pole of the battery, and to control the switching unit to switch the ground pin to be connected to the negative pole of the power supply when the sampled voltage satisfies the voltage range.

13. The power taking controller according to claim 1, characterized in that: Also includes: A power supply unit, wherein the input end of the power supply unit is connected to the output end of the voltage conversion unit, the output end of the power supply unit is connected to the power supply end of the control unit, and the power supply unit is configured to generate a supply voltage according to the output voltage of the voltage conversion unit to power the control unit.

14. The power taking controller according to claim 13, characterized in that: The power supply unit comprises: a first capacitor, one end of the first capacitor being connected to the output end of the voltage conversion unit, the other end of the first capacitor being connected to the ground pin, and the first capacitor being configured to provide electrical energy when the switching unit performs switching; A linear regulator, wherein the input end of the linear regulator is respectively connected to the output end of the voltage conversion unit and one end of the first capacitor, the output end of the linear regulator is connected to the power supply end of the control unit, and the linear regulator is 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, characterized in that: It comprises a power taking controller according to any one of claims 1-14.

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