POWER SUPPLY SYSTEM, AND CONTROL METHOD AND APPARATUS
This application relates to a power supply system, and a control method and apparatus. The power supply system includes a first power supply circuit, a second power supply circuit, and a controller. A first power supply and a load are connected through the first power supply circuit; a second power supply and the load are connected through the second power supply circuit; and the controller is connected to the first power supply circuit and the second power supply circuit, and controls the first power supply circuit and/or the second power supply circuit to be connected. An output current of the first power supply circuit is a first current when the first power supply circuit is connected, and an output current of the second power supply circuit is a second current when the second power supply circuit is connected. The first current is less than the second current.
1 . A power supply system, comprising:
a first power supply circuit connected to a first power supply and a load;
a second power supply circuit connected to a second power supply and the load;
a detection and hold control circuit connected to the first power supply, the second power supply, and the load; and
a controller connected to the detection and hold control circuit, the first power supply circuit, and the second power supply circuit, wherein
the controller controls the first power supply circuit and/or the second power supply circuit to be connected to the load;
an output current of the first power supply circuit is a first current when the first power supply circuit is connected;
an output current of the second power supply circuit is a second current when the second power supply circuit is connected and the first current is less than the second current;
the detection and hold control circuit sends a first wake-up signal to the controller and the second power supply circuit when detecting that the first current is greater than or equal to a first threshold;
the controller enters a working state when receiving the first wake-up signal, and sends a first hibernation signal to the first power supply circuit;
the first power supply circuit is disconnected when receiving the first hibernation signal; and
the second power supply circuit is connected to the load when receiving the first wake-up signal.
2 . The power supply system according to claim 1 , wherein
the detection and hold control circuit comprises:
a sampling resistor; and
a voltage comparator, wherein
a first end of the sampling resistor is connected to the first power supply circuit and a first end of the voltage comparator;
a second end of the sampling resistor is connected to the load and a second end of the voltage comparator; and
a third end of the voltage comparator is connected to the controller and the second power supply circuit; and
the voltage comparator:
obtains a first voltage at the first end of the sampling resistor and a second voltage at the second end of the sampling resistor;
determines a voltage difference between the first voltage and the second voltage;
determines the first current based on the voltage difference and a resistance value of the sampling resistor; and
outputs the first wake-up signal to the controller and the second power supply circuit when the first current is greater than or equal to the first threshold.
3 . The power supply system according to claim 1 , wherein,
when
the controller enters a working state when receiving the first wake-up signal, the controller sends a second wake-up signal to the second power supply circuit; and
the second power supply circuit is connected to the load when receiving the second wake-up signal.
4 . The power supply system according to claim 3 , wherein
the detection and hold control circuit comprises:
a sampling resistor; and
a voltage comparator, wherein
a first end of the sampling resistor is connected to the first power supply circuit and a first end of the voltage comparator;
a second end of the sampling resistor is connected to the load and a second end of the voltage comparator; and
a third end of the voltage comparator is connected to the controller; and
the voltage comparator:
obtains a first voltage at the first end of the sampling resistor and a second voltage at the second end of the sampling resistor;
determines a voltage difference between the first voltage and the second voltage;
determines the first current based on the voltage difference and a resistance value of the sampling resistor; and
outputs the first wake-up signal to the controller when the first current is greater than or equal to the first threshold.
5 . The power supply system according to claim 1 , wherein
when receiving a second hibernation signal from outside the power supply system, the controller sends a third wake-up signal to the first power supply circuit and a third hibernation signal to the second power supply circuit and enters a hibernation state;
the first power supply circuit is connected to the load when receiving the third wake-up signal; and
the second power supply circuit is disconnected from the load when receiving the third hibernation signal.
6 . The power supply system according to claim 1 , wherein the first power supply and the second power supply are different power supplies.
7 . The power supply system according to claim 1 , wherein
the first power supply circuit comprises at least one of:
a metal-oxide-semiconductor field-effect transistor;
a triode;
a passive switch; or
a relay; and
the second power supply circuit comprises a high-side driver.
8 . The power supply system according to claim 7 , wherein
the second power supply circuit further comprises an “OR” circuit, wherein
a first input end and a second input end of the “OR” circuit are respectively configured to receive the first wake-up signal and a second wake-up signal; and
an output end of the “OR” circuit is connected to the high-side driver; or
the second power supply circuit further comprises:
a first diode; and
a second diode, wherein
one end of the first diode receives the first wake-up signal;
another end of the first diode is connected to the high-side driver;
one end of the second diode receives the second wake-up signal; and
another end of the second diode is connected to the high-side driver.
9 . The power supply system according to claim 1 , wherein the detection and hold control circuit comprises:
a first sampling resistor;
a second sampling resistor; and
a triode; wherein
a first end of the first sampling resistor is connected to the first power supply circuit and a first end of the second sampling resistor;
a second end of the first sampling resistor is connected to the load and a base of the triode;
a second end of the second sampling resistor is connected to an emitter of the triode; and
a collector of the triode is connected to the controller and the second power supply circuit.
10 . The power supply system according to claim 9 , wherein the collector of the triode is further connected to the first end of the second sampling resistor through a capacitor.
11 . The power supply system according to claim 8 , wherein the triode is an NPN-type triode.
12 . A control method, wherein the method comprises:
receiving a status adjustment signal that indicates a controller to enter a hibernation state or a working state; and
performing status switching and controlling a status of a first power supply circuit and/or a status of a second power supply circuit based on the status adjustment signal, wherein
an output current of the first power supply circuit is a first current when the first power supply circuit is connected;
an output current of the second power supply circuit is a second current when the second power supply circuit is connected; and
the first current is less than the second current.
13 . The method according to claim 12 , wherein the performing the status switching and controlling the status of the first power supply circuit and/or the status of the second power supply circuit based on the status adjustment signal comprises:
sending a wake-up signal to the first power supply circuit and a hibernation signal to the second power supply circuit when the status adjustment signal indicates the controller to enter the hibernation state to connect the first power supply circuit to a load and disconnect the second power supply circuit from the load; and
entering the hibernation state.
14 . The method according to claim 12 , wherein the performing the status switching and controlling the status of the first power supply circuit and/or the status of the second power supply circuit based on the status adjustment signal comprises:
entering the working state when the status adjustment signal indicates the controller to enter the working state; and
sending a hibernation signal to the first power supply circuit and a wake-up signal to the second power supply circuit to disconnect the first power supply circuit from a load and connect the second power supply circuit to the load.
15 . A vehicle, wherein the vehicle comprises:
a first power supply;
a second power supply;
a load; and
the a power supply system, comprising:
a first power supply circuit connected to the first power supply and the load;
a second power supply circuit connected to the second power supply and the load;
a detection and hold control circuit connected to the first power supply, the second power supply, and the load; and
a controller connected to the detection and hold control circuit, the first power supply circuit, and the second power supply circuit, wherein
the controller controls the first power supply circuit and/or the second power supply circuit to be connected to the load;
an output current of the first power supply circuit is a first current when the first power supply circuit is connected;
an output current of the second power supply circuit is a second current when the second power supply circuit is connected and the first current is less than the second current;
the detection and hold control circuit sends a first wake-up signal to the controller and the second power supply circuit when detecting that the first current is greater than or equal to a first threshold;
the controller enters a working state when receiving the first wake-up signal and sends a first hibernation signal to the first power supply circuit;
the first power supply circuit is disconnected when receiving the first hibernation signal; and
the second power supply circuit is connected to the load when receiving the first wake-up signal.
16 . The vehicle according to claim 15 , wherein
the detection and hold control circuit comprises:
a sampling resistor; and
a voltage comparator, wherein
a first end of the sampling resistor is connected to the first power supply circuit and a first end of the voltage comparator;
a second end of the sampling resistor is connected to the load and a second end of the voltage comparator; and
a third end of the voltage comparator is connected to the controller and the second power supply circuit; and
the voltage comparator:
obtains a first voltage at the first end of the sampling resistor and a second voltage at the second end of the sampling resistor;
determines a voltage difference between the first voltage and the second voltage;
determines the first current based on the voltage difference and a resistance value of the sampling resistor; and
outputs the first wake-up signal to the controller and the second power supply circuit when the first current is greater than or equal to the first threshold.
17 . The vehicle according to claim 15 , wherein,
when the controller enters a working state when receiving the first wake-up signal, the controller sends a second wake-up signal to the second power supply circuit; and
the second power supply circuit is connected to the load when receiving the second wake-up signal.
18 . The vehicle according to claim 17 , wherein
the detection and hold control circuit comprises:
a sampling resistor; and
a voltage comparator, wherein
a first end of the sampling resistor is connected to the first power supply circuit and a first end of the voltage comparator;
a second end of the sampling resistor is connected to the load and a second end of the voltage comparator; and
a third end of the voltage comparator is connected to the controller; and
the voltage comparator:
obtains a first voltage at the first end of the sampling resistor and a second voltage at the second end of the sampling resistor;
determines a voltage difference between the first voltage and the second voltage;
determines the first current based on the voltage difference and a resistance value of the sampling resistor; and
outputs the first wake-up signal to the controller when the first current is greater than or equal to the first threshold.
19 . The vehicle according to claim 15 , wherein
when receiving a second hibernation signal from outside the power supply system, the controller sends a third wake-up signal to the first power supply circuit and a third hibernation signal to the second power supply circuit and enters a hibernation state;
the first power supply circuit is connected to the load when receiving the third wake-up signal; and
the second power supply circuit is disconnected from the load when receiving the third hibernation signal.
20 . The vehicle according to claim 15 , wherein the first power supply and the second power supply are different power supplies.