CN212162913U - Interactive DC power supply switching device, uninterrupted DC stabilized power supply and vehicle - Google Patents
Interactive DC power supply switching device, uninterrupted DC stabilized power supply and vehicle Download PDFInfo
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- CN212162913U CN212162913U CN202020806176.7U CN202020806176U CN212162913U CN 212162913 U CN212162913 U CN 212162913U CN 202020806176 U CN202020806176 U CN 202020806176U CN 212162913 U CN212162913 U CN 212162913U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The utility model discloses an interactive direct current power supply auto-change over device, incessant direct current constant voltage power supply and vehicle, include: a first input end of the switching circuit is connected with the main power supply port, a second input end of the switching circuit is connected with the standby power supply port, and an output end of the switching circuit is connected with the power supply output port; the input end of the main power supply voltage division circuit is connected with the main power supply port, the output end of the main power supply voltage division circuit is connected with the switching circuit, and the main power supply voltage division circuit is used for controlling the first input end to be in conduction connection with the power supply output port when the main power supply voltage is larger than or equal to a preset threshold value; the main power supply voltage division circuit is also used for controlling the second input end to be connected with the power supply output port in a conduction mode when the main power supply voltage is smaller than a preset threshold value; and the input end of the interactive circuit is respectively connected with the standby power supply, the voltage stabilizing circuit and the switching circuit, and the output end of the interactive circuit is connected with the electric equipment. The utility model discloses power switching device utilizes main power supply bleeder circuit control power to switch, can realize data interaction, simple structure, and response speed is fast.
Description
Technical Field
The embodiment of the utility model provides a relate to power technical field, especially relate to an interactive direct current power switching device, incessant direct current constant voltage power supply and vehicle.
Background
Along with the development of intelligent driving technology, intelligent driving vehicle need carry on a large amount of consumer and realize automatic control, in order to prevent that on-vehicle consumer from taking place the outage in the state that the vehicle stopped, need set up on-vehicle uninterrupted power source and supply power to on-vehicle consumer.
At present, on-vehicle uninterrupted power source sets up the stand-by battery as the stand-by power supply of on-vehicle main storage battery usually, adopt power supply auto-change over device to switch on-vehicle power supply, traditional power supply auto-change over device uses alternating current output to give first place to, use the contravariant unit among its circuit structure to invert the direct current into the alternating current, need increase the rectifier unit in order to match the direct current consumer, its shortcoming that exists is, circuit structure is complicated, use cost is higher, when the consumer is more, adopt contravariant unit and rectifier unit to carry out voltage conversion, can increase power supply auto-change over device self power loss, the economic nature is relatively poor.
The existing power supply switching device adopting direct current output generally adopts a direct current power supply to directly control a relay to act to realize power supply switching, or adopts a voltage controller to control a change-over switch to act to realize power supply switching, and has the defects that the switching voltage of different types of vehicle relays or change-over switches cannot be adjusted, the compatibility of the switching voltage is poor, in addition, the existing power supply switching device cannot realize active control on electric equipment according to the running state of a power supply, and when the power supply failure or the electric quantity of the power supply is low, the power failure easily occurs, so that the data loss of the electric equipment is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides an interactive direct current power switching device has solved power switching device's switching voltage and can not adjust and the problem of power and the unable communication of consumer, and circuit structure is simple, can realize the data interaction of power and consumer.
In a first aspect, an embodiment of the present invention provides an interactive dc power switching apparatus, including: the switching circuit comprises a switching circuit, a main power supply voltage division circuit, a voltage stabilizing circuit and an interaction circuit, wherein a first input end of the switching circuit is connected with a main power supply port, a second input end of the switching circuit is connected with a standby power supply port, an output end of the switching circuit is connected with a power supply output port through the voltage stabilizing circuit, and the main power supply and the standby power supply are direct-current power supplies; the input end of the main power supply voltage dividing circuit is connected with the main power supply port, the output end of the main power supply voltage dividing circuit is connected with the control end of the switching circuit, and the main power supply voltage dividing circuit is used for outputting divided voltage when a main power supply voltage U1 is greater than or equal to a preset threshold value U0, controlling the first input end to be connected with the power supply output port in a conducting mode, and controlling the second input end to be disconnected with the power supply output port; the main power supply voltage dividing circuit is further configured to stop outputting the divided voltage when a main power supply voltage U1 is smaller than a preset threshold value U0, control the second input end to be in conductive connection with the power supply output port, and control the first input end to be disconnected from the power supply output port; the input end of the interactive circuit is respectively coupled with the standby power supply, the voltage stabilizing circuit and the switching circuit, the output end of the interactive circuit is connected with an electric device through a communication interface, the interactive circuit is used for acquiring the operating state of the switching circuit, and the interactive circuit is also used for acquiring the operating parameters of the standby power supply and the voltage stabilizing circuit, wherein the operating parameters comprise voltage, current and power under different operating states, and the operating parameters are sent to the electric device.
In a second aspect, the embodiment of the present invention further provides an uninterruptible dc voltage-stabilized power supply, which is characterized in that, include: the interactive direct-current power supply switching device comprises a main power supply, a standby power supply and the interactive direct-current power supply switching device, wherein the main power supply and the standby power supply are direct-current power supplies.
The embodiment of the utility model provides a third aspect still provides a vehicle, including above-mentioned incessant constant voltage power supply of direct current.
The utility model provides an incessant DC voltage-stabilized power supply and vehicle, adopt interactive DC power supply auto-change over device, interactive DC power supply auto-change over device detects the voltage of main power supply through main power supply bleeder circuit, when main power supply voltage U1 is more than or equal to preset threshold value U0, control main power supply to supply power to consumer, when main power supply voltage U1 is less than preset threshold value U0, control stand-by power supply to supply power to consumer, obtain power switching over device's operational parameter and running state through interactive circuit simultaneously, and send the operational parameter to consumer, preset threshold value U0 can be adjusted according to the vehicle type, the problem that power switching over device's switching voltage can not be adjusted and power and consumer can not communicate has been solved, circuit structure is simple, low in use cost, switching response speed is fast, can realize the data interaction of power and consumer, the intelligent degree is high.
Drawings
Fig. 1 is a schematic structural diagram of an interactive dc power switching apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of an appearance structure of an interactive dc power switching device according to a first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an interactive dc power switching apparatus according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a simulation result of a switching circuit according to a first embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an interaction circuit according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of an uninterruptible dc voltage-stabilized power supply according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a vehicle according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of an interactive dc power switching apparatus according to an embodiment of the present invention. Fig. 2 is a schematic diagram of an appearance structure of an interactive dc power switching device according to an embodiment of the present invention. The embodiment can be applied to an application scene of switching the power supply of the vehicle-mounted direct-current electric equipment. The power supply of the vehicle-mounted direct-current power equipment comprises a main power supply 010 and a standby power supply 020, wherein the main power supply 010 and the standby power supply 020 are direct-current power supplies, exemplarily, the main power supply 010 comprises a vehicle-mounted main storage battery and a vehicle-mounted generator, and the standby power supply 020 comprises a vehicle-mounted standby storage battery. As shown in fig. 1, the interactive dc power source switching device 030 includes: a switching circuit 301, a main power supply voltage dividing circuit 302, a voltage stabilizing circuit 303, and an interaction circuit 304. As shown in fig. 2, the interactive dc power switching device 030 further includes a heat dissipating casing 101, the switching circuit 301, the main power voltage divider circuit 302, the voltage regulator circuit 303 and the interaction circuit 304 are disposed in a casing of the heat dissipating casing 101, and a main power port 102, a standby power port 103, at least one power output port 104 and at least one communication interface 105 are disposed on an outer surface of the casing of the heat dissipating casing 101, wherein the main power port 102 is electrically connected to a positive terminal of the main power 010 via a power cable, the standby power port 103 is electrically connected to a positive terminal of the standby power 020 via the power cable, the power output port 104 is electrically connected to the electric equipment 040 via the power cable, and the communication interface 105 is communicatively connected to the electric equipment 040 via the communication cable.
For example, as shown in fig. 2, the communication interface 105 and the power output port 104 may be integrated, and the power supply cable and the communication cable may be made into an integrated harness, so as to facilitate the connection and the plugging of the electric device 040 and the interactive dc power supply switching device 030, and the manufacturing process is simple.
As shown IN fig. 1, a first input terminal IN1 of the switching circuit 301 is connected to the main power port 102, a second input terminal IN2 of the switching circuit 301 is connected to the standby power port 103, and an output terminal OUT1 of the switching circuit 301 is connected to the power output port 104 through the regulator circuit 303; the input end of the main power voltage dividing circuit 302 is connected with the main power port 102, the output end of the main power voltage dividing circuit 302 is connected with the control end C of the switching circuit 301, and the main power voltage dividing circuit 302 is used for controlling the first input end IN1 to be connected with the power output port 104 IN a conducting manner and controlling the second input end IN2 to be disconnected with the power output port 104 when the main power voltage U1 is greater than or equal to a preset threshold value U0; the main power voltage dividing circuit 302 is further configured to control the second input terminal IN2 to be electrically connected to the power output port 104 and control the first input terminal IN1 to be electrically disconnected from the power output port 104 when the main power voltage U1 is less than a preset threshold value U0; the input end of the interaction circuit 304 is coupled to the standby power source 020, the voltage stabilizing circuit 303 and the switching circuit 301, respectively, the output end of the interaction circuit 304 is connected to the electric device 040 through the communication interface 105, the interaction circuit 304 is configured to obtain the operating state of the switching circuit 301, and the interaction circuit 304 is further configured to obtain the operating parameters of the standby power source 020 and the voltage stabilizing circuit 303, where the operating parameters include voltage, current and power consumption in different operating states, and send the operating parameters to the electric device 040.
In different types of vehicles, the main storage battery can be different types of battery assemblies, typically, the main storage battery can be a lead-acid storage battery assembly or a lithium ion battery assembly, a corresponding preset threshold value U0 can be set according to the type of the main storage battery, the preset threshold value U0 is a discharge cut-off voltage value of the main power supply 010, the main power supply 010 can be prevented from being over-discharged, and the service life of the main power supply 010 is prolonged.
In the present embodiment, as shown in fig. 1, the positive terminal of the main battery is electrically connected to the power generation output terminal of the vehicle-mounted generator, and when the vehicle is running, the vehicle-mounted generator outputs a dc voltage to charge the main power supply 010, and at the same time, the power generation output terminal of the vehicle-mounted generator is electrically connected to the main power supply port 102, and the vehicle-mounted generator is also used to supply power to the vehicle-mounted electric equipment 040. The main power supply voltage division circuit 302 collects the voltage of the main power supply 010 IN real time, if the vehicle is IN a running state, and the main power supply voltage U1 is greater than or equal to a preset threshold value U0, the main power supply voltage division circuit 302 outputs the divided voltage, controls the first input end IN1 to be IN conductive connection with the power supply output port 104, and controls the second input end IN2 to be disconnected from the power supply output port 104, and at the moment, the main power supply 010 serves as a power supply to supply power to the electric equipment 040; if the vehicle is IN a stop operation state and the main power voltage U1 is smaller than the preset threshold value U0, the main power voltage divider circuit 302 stops outputting the divided voltage, controls the second input terminal IN2 to be connected with the power output port 104 IN a conducting manner, and controls the first input terminal IN1 to be disconnected from the power output port 104, and at this time, the backup power source 020 is used as a power supply source to supply power to the electric equipment 040.
In this embodiment, the interaction circuit 304 detects the level signal of the switching circuit 301 in real time, and when receiving the first level signal, the interaction circuit 304 determines that the switching circuit 301 is in the operating state of the main power supply 010; when receiving the second level signal, the interaction circuit 304 determines that the switching circuit 301 is in the operating state of supplying power by the backup power supply 020. Further, if the standby power source 020 is supplying power, the interaction circuit 304 acquires the operation parameters of the circuit, such as the voltage of the standby power source 020, the current flowing through the voltage stabilizing circuit 303, and the power consumption of the electric equipment 040, in real time, and transmits the operation parameters to the electric equipment 040. The electric equipment 040 monitors and displays the operation parameters of the interactive direct-current power supply switching device 030, and performs protection actions according to the operation parameters, for example, if the remaining electric quantity of the backup power supply 020 is lower than a preset minimum electric quantity, the electric equipment 040 executes a data storage instruction of itself, stores important data of the electric equipment 040, executes a shutdown instruction, and can avoid important data loss caused by power failure.
IN the present embodiment, as shown IN fig. 1, the interactive dc power supply switching device 030 further includes an input protection circuit 305, and the input protection circuit 305 is disposed between the first input terminal IN1 and the main power supply port 102. Illustratively, the input protection circuit 305 includes a diode, a voltage limiting circuit and an anti-surge circuit, the anode of the diode is connected to the main power port 102, the cathode of the diode is connected to the first input terminal IN1 through the voltage limiting circuit and the filter circuit, so as to prevent the main power 010 from being reversely connected, the voltage limiting circuit is used for dividing the main power 010 and preventing the voltage of the main power 010 input to the interactive dc power switching apparatus 030 from exceeding a preset voltage range, and the anti-surge circuit is used for preventing the surge voltage of the main power 010 from damaging components IN the interactive dc power switching apparatus 030.
Therefore, the utility model discloses interactive direct current power switching device passes through the voltage that main power supply bleeder circuit detected the main power, when main power supply voltage U1 more than or equal to predetermines threshold value U0, control main power supply supplies power to consumer, when main power supply voltage U1 is less than predetermine threshold value U0, control stand-by power supply supplies power to consumer, obtain power switching device's running parameter and running state through mutual circuit simultaneously, and send running parameter to consumer, the switching voltage that has solved power switching device can not adjust and the problem of power and the unable communication of consumer, circuit structure is simple, low in use cost, switching response speed is fast, can realize the data interaction of power and consumer, intelligent degree is high.
Fig. 3 is a schematic circuit diagram of an interactive dc power switching apparatus according to a first embodiment of the present invention.
As shown in fig. 3, the main power voltage dividing circuit 302 includes a first voltage dividing resistor R101, a second voltage dividing resistor R201, and a zener diode D1, wherein a first terminal of the first voltage dividing resistor R101 is connected to the main power port 102, and a second terminal of the first voltage dividing resistor R101 is connected to the anode of the zener diode D1; a first end of the second voltage-dividing resistor R201 is connected to the anode of the zener diode D1, and a second end of the second voltage-dividing resistor R201 is grounded; the cathode of the zener diode D1 is connected to the control terminal C of the switching circuit 301, wherein the zener diode D1 has a zener voltage value of UZThe resistance value of the first divider resistor is R10, the resistance value of the second divider resistor is R20, and the regulated voltage value is UZResistance value R10 and resistance value R20 satisfy
Referring to fig. 1 and 3, the main power voltage divider circuit 302 collects the main power voltage U1 in real time, and the regulated voltage value of the zener diode D1 is UZIf the main power supply voltage U1 is greater than or equal to the preset threshold value U0, the voltage of the anode of the zener diode D1 is greater than or equal to the regulated value UZWhen the zener diode D1 is turned on, the main power supply voltage dividing circuit 302 outputs a divided voltage; if the main power voltage U1 is less than the preset threshold U0, the voltage of the anode of the zener diode D1 is less than the zener value UZWhen the zener diode D1 is turned off, the main power supply voltage divider circuit 302 stops outputting the divided voltage.
For example, when the interactive direct-current power switching device is applied to different types of vehicles, the corresponding preset threshold value U0 can be set according to the type of the main battery, and the voltage stabilizing value U of the voltage stabilizing diode D1 is selectedZThen, the regulated voltage value U can be obtained by adjusting the resistance value R10 of the first divider resistor R101 and the resistance value R20 of the second divider resistor R201ZResistance value R10 and resistance value R20 satisfy
For example, if the main battery in the vehicle is a lithium battery pack with a rated voltage equal to 12V, the preset threshold U0 may be set to 12.3V. If the regulated voltage value U of the voltage-regulator diode D1 is selectedZWhen the voltage is 5V, the first divider resistor R101 and the second divider resistor R201 satisfy the resistance
If the resistance value of the second voltage-dividing resistor R20 is selected to be 50 kilo-ohms, the resistance value of the first voltage-dividing resistor R101 is set to be 73 kilo-ohms.
As shown in fig. 3, the switching circuit 301 includes a first switch tube Q1, a ground resistor R6, a pull-up resistor R7, a main power supply switch tube Q20, a standby power supply switch tube Q30, a main power supply control branch 311, and a standby power supply control branch 312, wherein an input end S of the first switch tube Q1 is connected to the standby power port 103 through the pull-up resistor R7, an output end of the first switch tube Q1 is grounded, a control end of the first switch tube Q1 is connected to an output end of the main power voltage divider circuit 302, a first end of the ground resistor R6 is connected to a control end of the first switch tube Q1, a second end of the ground resistor R6 is grounded, and when the main power voltage divider circuit 302 stops outputting a divided voltage, the ground resistor R6 can ensure that the control end of the first switch tube Q1 is reliably grounded.
The input end of a main power supply switch tube Q20 is connected with a main power supply port 102, the output end of a main power supply switch tube Q20 is connected with a power supply output port 104 through a voltage stabilizing circuit 303, the control end of a main power supply switch tube Q20 is connected with the input end S of a first switch tube Q1 through a main power supply control branch 311, the main power supply control branch 311 is used for controlling the main power supply switch tube Q20 to be switched on when a low level signal is received, and controlling the main power supply switch tube Q20 to be switched off when a high level signal is received; the input end of the standby power supply switch tube Q30 is connected with the standby power supply port 103, the output end of the standby power supply switch tube Q30 is connected with the power output port 104 through a voltage stabilizing circuit 303, the control end of the standby power supply switch tube Q30 is connected with the input end S of the first switch tube Q1 through a standby power supply control branch 312, the standby power supply control branch 312 is used for switching on the standby power supply switch tube Q30 when receiving a high level signal, and switching off the standby power supply switch tube Q30 when receiving a low level signal.
For example, the first switch Q1 may be an NPN transistor, the main power supply switch Q20 may be a P-channel MOS transistor, and the standby power supply switch Q30 may be a P-channel MOS transistor. The drain of the main power supply switching tube Q20 is connected to the main power port 102, the source of the main power supply switching tube Q20 is connected to the power output port 104 through the voltage stabilizing circuit 303, and the gate of the main power supply switching tube Q20 is connected to the input terminal S of the first switching tube Q1 through the main power supply control branch 311. The source of the standby power supply switching tube Q30 is connected to the standby power supply port 103, the drain of the standby power supply switching tube Q30 is connected to the power output port 104 through the voltage stabilizing circuit 303, and the gate of the standby power supply switching tube Q30 is connected to the input terminal S of the first switching tube Q1 through the standby power supply control branch 312.
Of course, on the premise of ensuring that the circuit control logic is not changed, the first switch Q1, the main power supply switch Q20 and the standby power supply switch Q30 may be configured as other types of switch elements, which is not limited in this respect.
As shown in fig. 3, the main power supply control branch 311 includes a first resistor R1, a second resistor Q2, a second resistor R2, a third resistor R3, a fourth resistor R4 and a third switch Q3, wherein a first end of the first resistor R1 is connected to the input end S of the first switch Q1, a second end of the first resistor R1 is connected to the control end of the second switch Q2, an input end of the second switch Q2 is connected to the standby power port 103 through the second resistor R2, an output end of the second switch Q2 is grounded, a control end of the third switch Q3 is connected to the input end of the second switch Q2, an input end of the third switch Q3 is grounded, an output end of the third switch Q3 is connected to the control end of the main power supply switch Q20 through the third resistor R3, and an output end of the third switch Q3 is connected to the power output port 104 through the fourth resistor R4.
For example, the second switching transistor Q2 may be an NPN transistor, and the third switching transistor Q3 may be an N-channel MOS transistor. The source of the third switching tube Q3 is grounded, the drain of the third switching tube Q3 is connected to the control terminal of the main power supply switching tube Q20 through a third resistor R3, and the gate of the third switching tube Q3 is connected to the power output port 104 through a fourth resistor R4.
As shown in fig. 3, the standby power supply control branch 312 includes a first resistor R1, a second switch Q2, a second resistor R2, and a fifth resistor R5, wherein a first end of the first resistor R1 is connected to the input terminal S of the first switch Q1, a second end of the first resistor R1 is connected to the control terminal of the second switch Q2, an input terminal of the second switch Q2 is connected to the standby power port 103 through the second resistor R2, an output terminal of the second switch Q2 is grounded, and an input terminal of the second switch Q2 is further connected to the control terminal of the standby power supply switch Q30 through the fifth resistor R5.
For example, the second switch Q2 may be an NPN transistor, a base of the second switch Q2 is connected to the second end of the first resistor R1, a collector of the second switch Q2 is connected to the standby power port 103 through the second resistor R2, and an emitter of the second switch Q2 is grounded.
As shown in fig. 3, the interactive dc power supply switching device 030 further includes a reverse cut-off unit 313, an anode of the reverse cut-off unit 313 is connected to the output end of the standby power supply switching tube Q30, a cathode of the reverse cut-off unit 313 is connected to the power output port 104, and the reverse cut-off unit 313 is turned on in the forward direction and turned off in the reverse direction, so as to avoid generating a reverse voltage and damaging the elements of the switching circuit 301.
Illustratively, as shown in fig. 3, the reverse blocking unit 313 may be a P-channel type MOS transistor Q10. The drain of the reverse blocking unit 313 is connected to the output terminal of the standby power supply switching transistor Q30, the source of the reverse blocking unit 313 is connected to the power output port 104, and the gate of the reverse blocking unit 313 is connected to the power output port 104. Of course, the reverse blocking unit 313 may be configured as a low-voltage drop type diode, and may also function to prevent reverse flow.
Referring to fig. 1 and 3 in combination, a preset threshold value U0 is set according to the type of the main power source 010 of the vehicle by adjusting the resistance values of the first and second voltage dividing resistors R101 and R201 and the regulated voltage value U of the zener diode D1ZSo that the regulated voltage value UZResistance value R10 and resistance value R20 satisfy
The main power voltage dividing circuit 302 collects the main power voltage U1 in real time, if the main power voltage U1 is greater than or equal to a preset threshold value U0, the voltage stabilizing diode D1 is turned on, the main power voltage dividing circuit 302 outputs a divided voltage U',
the divided voltage U' is greater than the turn-on voltage of the first switch tube Q1, the first switch tube Q1 is turned on, and the input end S of the first switch tube Q1 is in a low level state; the second switch tube Q2 receives a low level signal, the base voltage of the second switch tube Q2 is less than the turn-on voltage of the second switch tube Q2, and the second switch tube Q2 is turned off; the gate source voltages of the standby power supply switch tube Q30 are equal, and the standby power supply switch tube Q30 is turned off; the voltage difference of the grid source electrode of the third switching tube Q3 is larger than the conduction voltage drop, and the third switching tube Q3 is switched on; when the voltage difference between the gate and the source of the main power supply switch Q20 is greater than the conduction voltage drop and the main power supply switch Q20 is turned on, if the main power supply voltage U1 is greater than or equal to the preset threshold value U0, the main power supply switch Q20 is turned on, the main power port 102 is connected to the power output port 104 in a conduction manner, the standby power supply switch Q30 is turned off, the standby power port 103 is disconnected from the power output port 104, and the main power supply 010 supplies power to the electric equipment 040.
If the main power supply voltage U1 is less than the preset threshold value U0, the zener diode D1 is turned off, the main power supply voltage dividing circuit 302 stops outputting the divided voltage U', the first switch tube Q1 is turned off, the input end S of the first switch tube Q1 is communicated with the standby power supply 020, and the input end S of the first switch tube Q1 is in a high level state; the second switch tube Q2 receives a high level signal, the base voltage of the second switch tube Q2 is greater than the turn-on voltage of the second switch tube Q2, and the second switch tube Q2 is turned on; the voltage difference value of the gate source electrode of the standby power supply switch tube Q30 is greater than the conduction voltage drop, and the standby power supply switch tube Q30 is switched on; the voltage difference of the grid source electrode of the third switching tube Q3 is smaller than the conduction voltage drop, and the third switching tube Q3 is turned off; the gate-source voltage difference of the main power supply switching tube Q20 is smaller than the turn-on voltage drop, and the main power supply switching tube Q20 is turned off, so that if the main power supply voltage U1 is smaller than the preset threshold value U0, the main power supply switching tube Q20 is turned off, the main power supply port 102 is disconnected from the power supply output port 104, the standby power supply switching tube Q30 is turned on, the standby power supply port 103 is connected to the power supply output port 104 in a turn-on manner, and the standby power supply 020 supplies power to the electric equipment 040.
Fig. 4 is a schematic diagram of a simulation result of the switching circuit according to the first embodiment of the present invention. The simulation verification of the switching circuit can be realized by adopting a computer carrying simulation software such as MATLAB or the input and output voltages of the switching circuit can be verified by adopting an oscilloscope.
As shown in fig. 4, establish the circuit structure of the switching circuit 301 of the present invention, set up the main power supply 010 to supply power according to the preset frequency, for example, the output voltage when setting up the stable power supply of the main power supply 010 is 36V, the output voltage when the main power supply 010 stops supplying power is 0V, the power supply time of the main power supply 010 lasts 5 milliseconds, the time that the main power supply 010 stops supplying power lasts 3 milliseconds, the time that the main power supply 010 transits from the non-power supply to the stable power supply lasts 1 millisecond, the power supply voltage of the backup power supply 020 is constant 14V, the working performance of the switching circuit 301 is verified.
As shown in fig. 4, it is known from simulation verification that when the main power supply 010 supplies power stably, the voltage value at the output terminal of the switching circuit 301 is approximately 36V, and at this time, the electric equipment 040 is supplied with power from the main power supply 010; when the main power supply 010 stops supplying power, the voltage value at the output end of the switching circuit 301 is approximately 14V, and at this time, the standby power supply 020 supplies power to the electric equipment 040, so that the switching circuit 301 can realize seamless switching between the main power supply 010 and the standby power supply 020, and the switching response speed is high.
Therefore, the embodiment of the utility model provides an interactive direct current power switching device's circuit structure is simple, and use cost is low, and switching response speed is fast, and the predetermined threshold value U0 of carrying out the power switching action can be adjusted according to the vehicle type, and the practicality is strong.
As shown in fig. 1, the interactive dc power source switching device 030 further includes a charging management circuit 306, an input terminal I1 of the charging management circuit 306 is connected to the main power source port 102, an output terminal O1 of the charging management circuit 306 is connected to the standby power source port 103, a control terminal C1 of the charging management circuit 306 is connected to an input terminal S of the first switch tube Q1, and the charging management circuit 306 is configured to control the main power source 010 to charge the standby power source 020 when receiving a low level signal and control the main power source 010 to stop charging the standby power source 020 when receiving a high level signal.
Illustratively, the charging management circuit 306 includes a charging management chip, a DC-DC circuit and a fourth switching tube, wherein the charging management chip is provided with a plurality of output pins and control pins, and the DC-DC circuit and the fourth switching tube are respectively connected to the output pins of the charging management chip, wherein the DC-DC circuit can adopt a buck-boost topology structure for adjusting charging voltage, the control pin of the charging management chip is connected to the input terminal S of the first switching tube Q1, if the main power supply voltage U1 is greater than or equal to the preset threshold value U0, the input terminal S of the first switching tube Q1 is in a low level state, the control pin of the charging management chip receives a low level signal and controls the fourth switching tube to be turned on, and the main power supply 010 charges the backup power supply 020 after being processed by the DC-DC circuit; if the main power voltage U1 is less than the preset threshold value U0, the input terminal S of the first switch tube Q1 is in a high level state, the control pin of the charge management chip receives a high level signal, the fourth switch tube is controlled to be turned off, and the main power 010 stops charging the backup power 020. Therefore, when the main power supply voltage U1 is greater than or equal to the preset threshold value U0, the switching circuit 301 controls the charging management circuit 306 to charge the main power supply 010 to the backup power supply 020; when the main power voltage U1 is less than the preset threshold U0, the switching circuit 301 controls the charging management circuit 306 to stop the main power 010 from charging the backup power 020, and the switching response speed is fast.
In this embodiment, the charging management circuit 306 further includes a plurality of sampling resistors R, and the charging management circuit 306 is further configured to obtain a charging current and a charging current when the main power supply 010 charges the backup power supply 020. The charging management circuit 306 further includes a timing unit for recording a charging start time and a charging cutoff time.
Fig. 5 is a schematic circuit diagram of an interaction circuit according to a first embodiment of the present invention.
As shown in fig. 5, the interaction circuit 304 includes: the device comprises a main control unit 401, a sampling unit 402, an analog-to-digital conversion unit 403, a display unit 404 and a communication module 405, wherein the sampling unit 402 comprises an analog quantity sampling circuit 041 and a switching value sampling circuit 042, the input end of the analog quantity sampling circuit 041 is respectively connected with a standby power supply and a voltage stabilizing circuit, the output end of the analog quantity sampling circuit 041 is connected with the first input end of the main control unit 401 through the analog-to-digital conversion unit 403, the input end of the switching value sampling circuit 042 is connected with the input end S of a first switching tube Q1, the output end of the switching value sampling circuit 042 is connected with the second input end of the main control unit 401, and the switching value sampling circuit 042 is used for acquiring a level signal of the input end S of the first switching tube Q; the display unit 404 is coupled to the first output terminal of the main control unit 401, the display unit 404 includes a display screen 043102 and an indicator light 044, the display screen 043 may be an LCD display screen, as shown in fig. 2, the display screen 043 and the indicator light 044 are both disposed on the outer surface of the housing of the heat dissipation housing 101, the display screen 043 is used for displaying operation parameters, and the indicator light 044 includes a charging indicator light 441, a main power indicator light 442, a standby power indicator light 443, and a fault indicator light 444; a communication module 405 is coupled to a second output of the main control unit 401, the communication module 405 comprising an ethernet communication module 501 and/or a bus communication module 502.
As shown in fig. 5, the switching value sampling circuit 042 is connected to the input terminal S of the first switching tube Q1, the switching value sampling circuit 042 is configured to collect a level signal of the input terminal S of the first switching tube Q1, if the switching value sampling circuit 042 collects a low level signal, the main control unit 401 determines that the switching circuit is in a power supply operation state of the main power supply 010, and the main control unit 401 controls the charging indicator lamp 441 and the main power indicator lamp 442 to be turned on; if the switching value sampling circuit 042 collects a high level signal, the main control unit 401 determines that the switching circuit is in the running state of supplying power by the standby power supply 020, and the main control unit 401 controls the standby power supply indicator 443 to be turned on.
As shown in fig. 5, the interaction circuit 304 is further configured to obtain operation parameters of the backup power source 020 and the voltage stabilizing circuit 303, where the operation parameters include voltage, current, and power consumption in different operation states, and in an operation state of the main power source 010 supplying power, the operation parameters include charging current, charging voltage, charging time, and output power of the main power source 010 charging the backup power source 020; in the operation state of supplying power to the backup power source 020, the operation parameters include the residual capacity, the output power and the discharge time of the backup power source 020.
Specifically, the analog quantity sampling circuit 041 includes a first sampling resistor R01 and a second sampling resistor R02, the analog quantity sampling circuit 041 is connected to the output end of the voltage stabilizing circuit 303 through the first sampling resistor R01, the analog quantity sampling circuit 041 is connected to the positive end of the standby power supply 020 through the second sampling resistor R02, the analog quantity sampling circuit 041 collects the voltage at the output end of the voltage stabilizing circuit 303 and the voltages at the two ends of the first sampling resistor R01 in real time, the main control unit 401 calculates the current flowing through the first sampling resistor R01, and calculates the power consumption of the electric equipment 040 according to the current flowing through the first sampling resistor R01 and the voltage at the output end of the voltage stabilizing circuit 303. The analog quantity sampling circuit 041 is further configured to collect the voltage at the positive terminal of the backup power source 020 and the voltages at the two ends of the second sampling resistor R02 in real time, and the main control unit 401 calculates the current flowing through the second sampling resistor R02 and calculates the remaining capacity of the backup power source 020 according to the current flowing through the second sampling resistor R02 and the voltage at the positive terminal of the backup power source 020. Further, the main control unit 401 sends the operation parameters (for example, the remaining power of the backup power source 020, the power consumption of the electric equipment 040, the charging time, the discharging time, and the like) to the communication module 405, the communication module 405 sends the operation parameters to the communication interface 105, the communication interface 105 is in communication connection with the electric equipment 040 through a communication cable, the electric equipment 040 can acquire the remaining power of the backup power source 020 in real time in an operation state in which the backup power source 020 is powered, and if the remaining power of the backup power source 020 is lower than a preset minimum power, the electric equipment 040 executes its own data storage instruction and shutdown instruction.
Further, the first output terminal of the main control unit 401 is coupled to the display screen 043, and the main control unit 401 further transmits the above-mentioned operation parameters (such as the remaining capacity of the backup power source 020, the power consumption of the electric equipment 040, the charging time and the discharging time, etc.) to the display screen 043 for data display.
Illustratively, the interaction circuit 304 further includes an alarm unit 406, the alarm unit 406 includes a buzzer and a power warning light, the main control unit 401 determines whether the remaining power of the backup power source 020 is lower than a preset power threshold (e.g. 30% of the total power of the backup power source 020), and if the remaining power of the backup power source 020 is lower than the preset power threshold, the main control unit 401 controls the alarm unit 406 to issue an audible and visual alarm.
Further, main control unit 401 is also configured to detect whether interactive dc power source switching device 030 is in a short circuit or open circuit fault state according to the sampled current, and control fault indicator 444 to light when interactive dc power source switching device 030 is detected to be in a short circuit or open circuit fault state.
Therefore, the interactive direct current power supply switching device provided by the utility model detects the voltage of the main power supply through the main power supply voltage division circuit, when the main power supply voltage U1 is greater than or equal to a preset threshold value U0, the main power supply is controlled to supply power to the power consumption equipment, when the main power supply voltage U1 is less than the preset threshold value U0, the standby power supply is controlled to supply power to the power equipment, meanwhile, the operating parameters and the operating state of the power supply switching device are obtained through the interactive circuit, the operating parameters are sent to the electric equipment, the preset threshold U0 can be adjusted according to the type of the vehicle, the problems that the switching voltage of the power supply switching device cannot be adjusted and the power supply and the electric equipment cannot communicate are solved, the circuit structure is simple, the use cost is low, the switching response speed is high, the data interaction of the power supply and the electric equipment can be realized, the intelligent degree is high, and the data loss of the electric equipment caused by power failure of the power supply can be avoided.
Example two
Fig. 6 is a schematic structural diagram of an uninterruptible dc voltage regulator according to a second embodiment of the present invention. As shown in fig. 6, uninterruptible dc voltage regulator 100 includes: the main power supply 010, the backup power supply 020 and the interactive dc power supply switching device 030 are provided, wherein the main power supply 010 and the backup power supply 020 are both dc power supplies.
As shown in fig. 6, the main power supply 010 includes a main battery 011 and a vehicle-mounted generator 012, and the backup power supply 020 includes a vehicle-mounted backup battery.
In different types of vehicles, the main battery 011 can be different types of battery assemblies, typically, the main battery 011 can be a lead-acid battery assembly or a lithium-ion battery assembly, and a corresponding preset threshold U0 can be set according to the type of the main battery 011, and the preset threshold U0 is a discharge cut-off voltage value of the main power supply 010, so that the main power supply 010 can be prevented from being over-discharged, and the service life of the main power supply 010 can be prolonged.
The positive end of the main battery 011 is electrically connected with the power generation output end of the vehicle-mounted generator 012, the positive end of the main battery 011 is also connected with the main power port 102 of the interactive direct-current power supply switching device 030, and the negative end of the main battery 011 is grounded. The positive terminal of the backup power source 020 is connected to the backup power port 103, and the negative terminal of the backup power source 020 is grounded. The positive terminal of the main battery 011 is also connected with the positive terminal of the standby power supply 020 through the interactive direct-current power supply switching device 030. The interactive dc power switch 030 is configured to acquire and display the operating parameters of the backup power source 020, and send the operating parameters to the electric device 040.
Therefore, the uninterrupted DC stabilized voltage power supply provided by the utility model adopts the interactive DC power supply switching device, detects the voltage of the main power supply through the main power supply voltage division circuit, when the main power supply voltage U1 is greater than or equal to a preset threshold value U0, the main power supply is controlled to supply power to the power consumption equipment, when the main power supply voltage U1 is less than the preset threshold value U0, the standby power supply is controlled to supply power to the power equipment, meanwhile, the operation parameters of the standby power supply are obtained through the interactive circuit and are sent to the electric equipment, the preset threshold value U0 can be adjusted according to the type of the vehicle, the problems that the switching voltage of the power supply cannot be adjusted and the power supply and the electric equipment cannot communicate are solved, the circuit structure is simple, the use cost is low, the switching response speed is high, the data interaction of the power supply and the electric equipment can be realized, the intelligent degree is high, and the problem that the power supply fails to supply power to cause the data loss of the electric equipment can be avoided.
EXAMPLE III
Fig. 7 is a schematic structural diagram of a vehicle according to a third embodiment of the present invention. As shown in fig. 7, vehicle 200 includes uninterruptible dc voltage regulator 100 as described above.
The utility model adopts an interactive DC power supply switching device, detects the voltage of the main power supply through the main power supply voltage-dividing circuit, when the main power supply voltage U1 is greater than or equal to a preset threshold value U0, the main power supply is controlled to supply power to the power consumption equipment, when the main power supply voltage U1 is less than the preset threshold value U0, the standby power supply is controlled to supply power to the power equipment, meanwhile, the operation parameters of the standby power supply are obtained through the interactive circuit and are sent to the electric equipment, the preset threshold value U0 can be adjusted according to the type of the vehicle, the problems that the switching voltage of the vehicle-mounted power supply cannot be adjusted and the vehicle-mounted power supply cannot communicate with the vehicle-mounted electric equipment are solved, the circuit structure is simple, the use cost is low, the switching response speed is high, the data interaction between the vehicle-mounted power supply and the vehicle-mounted electric equipment can be realized, the intelligent degree is high, and the problem that the vehicle-mounted electric equipment loses data due to power failure of the power supply can be avoided.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. An interactive direct current power switching apparatus, comprising: a switching circuit, a main power supply voltage-dividing circuit, a voltage-stabilizing circuit and an interaction circuit, wherein,
the first input end of the switching circuit is connected with the main power supply port, the second input end of the switching circuit is connected with the standby power supply port, the output end of the switching circuit is connected with the power supply output port through the voltage stabilizing circuit, and the main power supply and the standby power supply are direct-current power supplies;
the input end of the main power supply voltage dividing circuit is connected with the main power supply port, the output end of the main power supply voltage dividing circuit is connected with the control end of the switching circuit, and the main power supply voltage dividing circuit is used for outputting divided voltage when a main power supply voltage U1 is greater than or equal to a preset threshold value U0, controlling the first input end to be connected with the power supply output port in a conducting mode, and controlling the second input end to be disconnected with the power supply output port; the main power supply voltage dividing circuit is further configured to stop outputting the divided voltage when a main power supply voltage U1 is smaller than a preset threshold value U0, control the second input end to be in conductive connection with the power supply output port, and control the first input end to be disconnected from the power supply output port;
the input end of the interactive circuit is respectively coupled with the standby power supply, the voltage stabilizing circuit and the switching circuit, the output end of the interactive circuit is connected with an electric device through a communication interface, the interactive circuit is used for acquiring the operating state of the switching circuit, and the interactive circuit is also used for acquiring the operating parameters of the standby power supply and the voltage stabilizing circuit, wherein the operating parameters comprise voltage, current and power under different operating states, and the operating parameters are sent to the electric device.
2. The interactive direct-current power switching device according to claim 1, wherein the main power dividing circuit comprises a first dividing resistor, a second dividing resistor and a zener diode, and a first end of the first dividing resistor is connected with the first dividing resistorThe main power supply port is connected, and the second end of the first divider resistor is connected with the anode of the voltage stabilizing diode; the first end of the second divider resistor is connected with the anode of the voltage stabilizing diode, and the second end of the second divider resistor is grounded; the negative electrode of the voltage stabilizing diode is connected with the control end of the switching circuit, wherein the voltage stabilizing value of the voltage stabilizing diode is UZThe resistance value of the first voltage-dividing resistor is R10, the resistance value of the second voltage-dividing resistor is R20, and the voltage-stabilizing value is UZResistance value R10 and resistance value R20 satisfy
3. The interactive direct current power switching apparatus according to claim 1, wherein the switching circuit comprises a first switch tube, a ground resistor, a pull-up resistor, a main power supply switch tube, a backup power supply switch tube, a main power supply control branch and a backup power supply control branch,
the input end of the first switch tube is connected with the standby power supply port through the pull-up resistor, the output end of the first switch tube is grounded, the control end of the first switch tube is connected with the output end of the main power supply voltage division circuit, the first end of the grounding resistor is connected with the control end of the first switch tube, and the second end of the grounding resistor is grounded;
the input end of the main power supply switch tube is connected with the main power supply port, the output end of the main power supply switch tube is connected with the power supply output port, the control end of the main power supply switch tube is connected with the input end of the first switch tube through the main power supply control branch, the main power supply control branch is used for controlling the main power supply switch tube to be switched on when a low level signal is received, and controlling the main power supply switch tube to be switched off when a high level signal is received;
the input of stand-by power supply switch tube with stand-by power supply port links to each other, stand-by power supply switch tube's output with power output port links to each other, stand-by power supply switch tube's control end passes through stand-by power supply control branch road with the input of first switch tube links to each other, stand-by power supply control branch road is used for controlling when receiving high level signal stand-by power supply switch tube switches on, controls when receiving low level signal stand-by power supply switch tube shuts off.
4. The interactive DC power switching apparatus according to claim 3, wherein the main power supply control branch comprises a first resistor, a second switch tube, a second resistor, a third resistor, a fourth resistor and a third switch tube, wherein, the first end of the first resistor is connected with the input end of the first switch tube, the second end of the first resistor is connected with the control end of the second switch tube, the input end of the second switch tube is connected with the standby power supply port through the second resistor, the output end of the second switch tube is grounded, the control end of the third switch tube is connected with the input end of the second switch tube, the input end of the third switching tube is grounded, the output end of the third switching tube is connected with the control end of the main power supply switching tube through the third resistor, and the output end of the third switching tube is connected with the power output port through the fourth resistor.
5. The interactive dc power switching apparatus according to claim 3, wherein the standby power supply control branch comprises a first resistor, a second switch tube, a second resistor, and a fifth resistor, wherein a first end of the first resistor is connected to the input end of the first switch tube, a second end of the first resistor is connected to the control end of the second switch tube, the input end of the second switch tube is connected to the standby power port through the second resistor, the output end of the second switch tube is grounded, and the input end of the second switch tube is connected to the control end of the standby power supply switch tube through the fifth resistor.
6. The interactive direct-current power supply switching device according to any one of claims 3 to 5, further comprising a reverse cut-off unit, wherein an anode of the reverse cut-off unit is connected to an output end of the standby power supply switching tube, a cathode of the reverse cut-off unit is connected to the power output port, and the reverse cut-off unit is turned on in a forward direction and turned off in a reverse direction.
7. The interactive dc power switching apparatus according to any one of claims 3-5, further comprising a charge management circuit, an input of the charge management circuit is connected to the main power port, an output of the charge management circuit is connected to the standby power port, a control terminal of the charge management circuit is connected to the input of the first switch tube, and the charge management circuit is configured to control the main power to charge the standby power when receiving a low level signal and control the main power to stop charging the standby power when receiving a high level signal.
8. The interactive direct current power switching apparatus of claim 3, wherein said interaction circuit comprises: a main control unit, a sampling unit, an analog-to-digital conversion unit, a display unit and a communication module, wherein,
the sampling unit comprises an analog quantity sampling circuit and a switching value sampling circuit, the input end of the analog quantity sampling circuit is respectively connected with the standby power supply and the voltage stabilizing circuit, the output end of the analog quantity sampling circuit is connected with the first input end of the main control unit through the analog-to-digital conversion unit, the input end of the switching value sampling circuit is connected with the input end of the first switching tube, the output end of the switching value sampling circuit is connected with the second input end of the main control unit, and the switching value sampling circuit is used for acquiring a level signal of the input end of the first switching tube;
the display unit is coupled with the first output end of the main control unit, the display unit comprises a display screen and indicator lights, the display screen is used for displaying the operation parameters, and the indicator lights comprise a charging indicator light, a main power indicator light, a standby power indicator light and a fault indicator light;
the communication module is coupled to the second output of the main control unit, and the communication module includes an ethernet communication module and/or a bus communication module.
9. An uninterruptible direct current voltage-stabilized power supply, comprising: a main power supply, a backup power supply, and the interactive direct current power switching apparatus of any one of claims 1-8, wherein the main power supply and the backup power supply are direct current power supplies.
10. A vehicle comprising an uninterruptible power supply according to claim 9.
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| CN202020806176.7U CN212162913U (en) | 2020-05-14 | 2020-05-14 | Interactive DC power supply switching device, uninterrupted DC stabilized power supply and vehicle |
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| CN202020806176.7U CN212162913U (en) | 2020-05-14 | 2020-05-14 | Interactive DC power supply switching device, uninterrupted DC stabilized power supply and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564268A (en) * | 2020-12-21 | 2021-03-26 | 深圳市有方科技股份有限公司 | Internet of things tracker terminal equipment |
| CN117439205A (en) * | 2023-12-15 | 2024-01-23 | 珠海科创储能科技有限公司 | Current switching circuit, method, storage medium, and electronic device |
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2020
- 2020-05-14 CN CN202020806176.7U patent/CN212162913U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564268A (en) * | 2020-12-21 | 2021-03-26 | 深圳市有方科技股份有限公司 | Internet of things tracker terminal equipment |
| CN112564268B (en) * | 2020-12-21 | 2023-06-30 | 深圳市有方科技股份有限公司 | Internet of things tracker terminal equipment |
| CN117439205A (en) * | 2023-12-15 | 2024-01-23 | 珠海科创储能科技有限公司 | Current switching circuit, method, storage medium, and electronic device |
| CN117439205B (en) * | 2023-12-15 | 2024-04-02 | 珠海科创储能科技有限公司 | Current switching circuit, method, storage medium, and electronic device |
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