Inverter circuit, inverter, and control method and apparatus of an inverter circuit
View Patent ↗Embodiments of the present invention disclose an inverter circuit, an inverter, and a control method and apparatus of an inverter circuit, which are used to solve the problem of direct connection of bridge arms of an inverter circuit. The inverter circuit comprises an inverter module and a filter module that are sequentially connected, wherein the inverter module comprises: a first bridge arm, comprising a first switch tube, a first inductor, a second inductor and a second switch tube that are sequentially connected in series; a second bridge arm, comprising a third switch tube and a first diode that are connected in series; a third bridge arm, comprising a fourth switch tube and a second diode that are connected in series; a first freewheeling branch; and a second freewheeling branch.
1. An inverter circuit, comprising an inverter module and a filter module that are sequentially connected, characterized in that the inverter module comprises:
a first bridge arm connected between a positive bus and a negative bus, comprising a first switch tube, a first inductor, a second inductor and a second switch tube that are sequentially connected in series;
a second bridge arm connected between a neural point and a first node, comprising a third switch tube and a first diode that are connected in series, a collector of the third switch tube being connected with the neural point, an emitter of the third switch tube being connected with an anode of the first diode, a cathode of the first diode being connected with the first node, the first node being a connection point between the first switch tube and the first inductor;
a third bridge arm connected between the neural point and a second node, comprising a fourth switch tube and a second diode that are connected in series, an emitter of the fourth switch tube being connected with the neural point, a collector of the fourth switch tube being connected with a cathode of the second diode, an anode of the second diode being connected with the second node, the second node being a connection point between the second switch tube and the second inductor;
a first freewheeling branch connected between the positive bus and the second node; and
a second freewheeling branch connected between the negative bus and the first node,
wherein the first inductor is connected with the second inductor such that their heteronymous ends are connected each other.
2. The inverter circuit according to claim 1 , characterized in that a collector of the first switch tube is connected with the positive bus, an emitter of the first switch tube is the first node, a collector of the second switch tube is the second node, and an emitter of the second switch tube is connected with the negative bus.
3. The inverter circuit according to claim 1 , characterized in that the first switch tube, the second switch tube, the third switch tube and the fourth switch tube each include an anti-parallel diode and a junction capacitor.
4. The inverter circuit according to claim 1 , characterized in that the first diode and the second diode each include a junction capacitor.
5. The inverter circuit according to claim 1 , characterized in that the first freewheeling branch comprises a third diode, and the third diode includes a junction capacitor, an anode of the third diode being connected with the second node, a cathode of the third diode being connected with the positive bus.
6. The inverter circuit according to claim 1 , characterized in that the second freewheeling branch comprises a fourth diode, and the fourth diode includes a junction capacitor, an anode of the fourth diode being connected with the negative bus, a cathode of the fourth diode being connected with the first node.
7. An inverter, characterized in that the inverter comprises the inverter circuit according to claim 1 .
8. A control method of an inverter circuit, for controlling the inverter circuit according to claim 1 , characterized by comprising:
detecting an output voltage value and an output current value of the inverter circuit; and
controlling states of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube according to the output voltage value and the output current value.
9. The method according to claim 8 , characterized in that the controlling states of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube according to the output voltage value and the output current value comprises:
when the output voltage value is greater than zero and the output current value is greater than zero, controlling the first switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the third switch tube to be on and controlling the second switch tube and the fourth switch tube to be off;
when the output voltage value is greater than zero and the output current value is less than zero, controlling the fourth switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the third switch tube to be on and controlling the first switch tube and the second switch tube to be off;
when the output voltage value is less than zero and the output current value is less than zero, controlling the second switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the fourth switch tube to be on and controlling the first switch tube and the third switch tube to be off; and
when the output voltage value is less than zero and the output current value is greater than zero, controlling the third switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the fourth switch tube to be on and controlling the first switch tube and the second switch tube to be off.
10. The method according to claim 8 , characterized in that the controlling states of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube according to the output voltage value and the output current value comprises:
when the output voltage value is greater than zero and the output current value is greater than zero, controlling the first switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the third switch tube to be on and controlling the second switch tube and the fourth switch tube to be off;
when the output voltage value is greater than zero and the output current value is less than zero, controlling the fourth switch tube utilizing a preset Pulse Width Modulation PWM signal, and controlling the first switch tube, the second switch tube and the third switch tube to be off;
when the output voltage value is less than zero and the output current value is less than zero, controlling the second switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the fourth switch tube to be on and controlling the first switch tube and the third switch tube to be off; and
when the output voltage value is less than zero and the output current value is greater than zero, controlling the third switch tube utilizing a preset Pulse Width Modulation PWM signal, and controlling the first switch tube, the second switch tube and the fourth switch tube to be off.
11. A control apparatus of an inverter circuit, for controlling the inverter circuit according to claim 1 , characterized by comprising:
a detection unit for detecting an output voltage value and an output current value of the inverter circuit; and
a control unit for controlling states of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube according to the output voltage value and the output current value.
12. The apparatus according to claim 11 , characterized in that the control unit is further used for:
when the output voltage value is greater than zero and the output current value is greater than zero, controlling the first switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the third switch tube to be on and controlling the second switch tube and the fourth switch tube to be off;
when the output voltage value is greater than zero and the output current value is less than zero, controlling the fourth switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the third switch tube to be on and controlling the first switch tube and the second switch tube to be off;
when the output voltage value is less than zero and the output current value is less than zero, controlling the second switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the fourth switch tube to be on and controlling the first switch tube and the third switch tube to be off; and
when the output voltage value is less than zero and the output current value is greater than zero, controlling the third switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the fourth switch tube to be on and controlling the first switch tube and the second switch tube to be off.
13. The apparatus according to claim 11 , characterized in that the control unit is further used for:
when the output voltage value is greater than zero and the output current value is greater than zero, controlling the first switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the third switch tube to be on and controlling the second switch tube and the fourth switch tube to be off;
when the output voltage value is greater than zero and the output current value is less than zero, controlling the fourth switch tube utilizing a preset Pulse Width Modulation PWM signal, and controlling the first switch tube, the second switch tube and the third switch tube to be off;
when the output voltage value is less than zero and the output current value is less than zero, controlling the second switch tube utilizing a preset Pulse Width Modulation PWM signal, controlling the fourth switch tube to be on and controlling the first switch tube and the third switch tube to be off; and
when the output voltage value is less than zero and the output current value is greater than zero, controlling the third switch tube utilizing a preset Pulse Width Modulation PWM signal, and controlling the first switch tube, the second switch tube and the fourth switch tube to be off.