Two-stage electrical controlling system and electrical apparatus
This application discloses an electrical system and an electrical apparatus. The electrical system includes: a first-stage conversion module including a plurality of first controllable switches; a second-stage conversion module including a plurality of second controllable switches; a first digital signal processor configured to control the first controllable switch; and a second digital signal processor configured to control the second controllable switch, where a first output crossbar switch of the first digital signal processor is configured to supply a first internal signal to a first output port, so that the second digital signal processor receives the first internal signal within a preset time through a second input port. The internal signal of the first digital signal processor can be enabled to be transmitted to the second digital signal processor within a relatively short time, thereby reducing a time interval for triggering a protection action between the two digital signal processors.
1. An electrical system, comprising:
a first-stage conversion module, wherein the first-stage conversion module comprises a first controllable switch;
a second-stage conversion module, wherein the second-stage conversion module is coupled to the first-stage conversion module and comprises a second controllable switch;
a first digital signal processor, wherein the first digital signal processor is configured to control the first controllable switch, and comprises a first output crossbar switch, a first output port and a first input port; and
a second digital signal processor, wherein the second digital signal processor is configured to control the second controllable switch, and comprises a second output crossbar switch, a second output port and a second input port;
wherein
the first digital signal processor and the second digital signal processor are connected by wirings;
the first output crossbar switch is a single-directional switch configured to conduct a first internal signal to the first output port, so that the second digital signal processor receives the first internal signal via the second input port within a preset time;
the second output crossbar switch is a single-directional switch configured to conduct a second internal signal to the second output port, so that the first digital signal processor receives the second internal signal via the first input port within the preset time; and
the electrical system further comprises an isolation module configured to provide an electrical isolation between the first digital processor and the second digital signal processor, the first output port of the first digital signal processor is connected to the second input port of the second digital signal processor via the isolation module, and the first input port of the first digital signal processor is connected to the second output port of the second digital signal processor via the isolation module.
2. The electrical system according to claim 1 , wherein
the first internal signal is a fault signal generated in the first digital signal processor and used to trigger the first digital signal processor to turn off the first controllable switch and trigger the second digital signal processor to turn off the second controllable switch; and
the second internal signal is a fault signal generated in the second digital signal processor and is used to trigger the first digital signal processor to turn off the first controllable switch and trigger the second digital signal processor to turn off the second controllable switch.
3. The electrical system according to claim 1 , wherein the first digital signal processor further comprises:
a first comparator unit configured to detect a voltage signal or current signal in the first-stage conversion module in real time; and
a first switch control unit configured to control the first controllable switch, wherein the first comparator unit is configured to:
when the voltage signal or current signal in the first-stage conversion module is abnormal, generate the first internal signal; and
the first switch control unit is configured to:
in response to the first internal signal, turn off the first controllable switch.
4. The electrical system according to claim 1 , wherein the second digital signal processor further comprises:
a second comparator unit configured to detect a voltage signal or current signal in the second-stage conversion module in real time; and
a second switch control unit configured to control the second controllable switch, wherein the second comparator unit is configured to:
when the voltage signal or current signal in the second-stage conversion module is abnormal, generate the second internal signal; and
the second switch control unit is configured to:
in response to the second internal signal, turn off the second controllable switch.
5. The electrical system according to claim 1 , wherein the electrical system further comprises:
a sampling circuit coupled to a connection of the first-stage conversion module and the second-stage conversion module, wherein the sampling circuit is configured to collect an electrical signal at the connection; and
a comparison circuit coupled to the sampling circuit,
wherein the comparison circuit is configured to:
when the electrical signal is abnormal, provide a third signal for the second digital signal processor,
wherein the second digital signal processor is further configured to:
in response to the third signal, turn off the second controllable switch.
6. The electrical system according to claim 5 , wherein the sampling circuit comprises:
a first comparator, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor,
wherein
one terminal of the first resistor is connected to a high-level terminal of the connection, another terminal of the first resistor is connected to one terminal of the second resistor to form a first connection node,
another terminal of the second resistor is grounded, and the first connection node is connected to a first input terminal of the first comparator;
one terminal of the third resistor is connected to a low-level terminal of the connection, and another terminal of the third resistor is connected to a second input terminal of the first comparator;
one terminal of the fourth resistor is connected to the second input terminal of the first comparator, and another terminal of the fourth resistor is connected to an output terminal of the first comparator to form a negative feedback path;
one terminal of the first capacitor is connected to the second input terminal of the first comparator, and another terminal of the first capacitor is connected to the output terminal of the first comparator; and
the output terminal of the first comparator is further coupled to the comparison circuit, to form an output terminal of the sampling circuit for providing a voltage signal that is proportional to a voltage at the connection.
7. The electrical system according to claim 5 , wherein the comparison circuit comprises a reference voltage source for providing a reference voltage and a second comparator;
a first input terminal of the second comparator is coupled to an output terminal of the voltage sampling circuit, and a second input terminal of the second comparator is coupled to the reference voltage source; and
an output terminal of the second comparator is connected to the second digital signal processor, and the second comparator is configured to: when a voltage at the output terminal of the sampling circuit is lower than the reference voltage, output the third signal to the second digital signal processor.
8. The electrical system according to claim 7 , wherein the comparison circuit further comprises:
a fifth resistor, a sixth resistor, a seventh resistor,
wherein
one terminal of the fifth resistor is connected to the reference voltage source, another terminal of the fifth resistor is connected to one terminal of the seventh resistor to form a second connection node,
another terminal of the seventh resistor is grounded, and the second connection node is connected to the second input terminal of the second comparator; and
one terminal of the sixth resistor is connected to the output terminal of the voltage sampling circuit, and another terminal of the sixth resistor is connected to the first input terminal of the second comparator.
9. An electrical apparatus, comprising the electrical system according to claim 1 and a load coupled to the electrical system, wherein the electrical system is configured to draw and convert external power to supply power to the load.