Electric circuit and air conditioner with direct-current load connected in parallel to capacitor in energy storage module
An electronic circuit includes a rectifier module and an energy storage module. The rectifier module includes a three-phase rectifier bridge including first, second, and third bridge arms connected in parallel to each other, and a bidirectional switch assembly including first, second, and third bidirectional switches. One ends of the first, second, and third bidirectional switches are connected to midpoints of the first, second, and third bridge arms, respectively. The energy storage module is connected to a direct-current output end of the rectifier module and includes two capacitors connected in series to each other. One of the two capacitors is connected in parallel to a direct-current load. Other ends of the first, second, and third bidirectional switches are connected between the two capacitors.
1 . An electronic circuit comprising:
a rectifier module including:
a three-phase rectifier bridge including a first bridge arm, a second bridge arm, and a third bridge arm connected in parallel to each other; and
a bidirectional switch assembly including:
a first bidirectional switch, one end of the first bidirectional switch being connected to a midpoint of the first bridge arm;
a second bidirectional switch, one end of the second bidirectional switch being connected to a midpoint of the second bridge arm; and
a third bidirectional switch, one end of the third bidirectional switch being connected to a midpoint of the third bridge arm;
an energy storage module connected to a direct-current output end of the rectifier module and including a first capacitor and a second capacitor connected in series to each other, the first capacitor being connected in parallel to an auxiliary power supply module and a first drive assembly, the first drive assembly being connected to and configured to drive a first direct-current fan, the second capacitor being connected in parallel to a second drive assembly, and the second drive assembly being connected to and configured to drive a second direct-current fan; and
a third drive assembly connected to the direct-current output end of the rectifier module, and connected to and configured to drive a compressor;
wherein another end of the first bidirectional switch, another end of the second bidirectional switch, and another end of the third bidirectional switch are connected between the first capacitor and the second capacitor.
2 . The electronic circuit according to claim 1 , wherein:
the direct-current output end includes a positive bus end and a negative bus end;
and
the positive bus end is connected to the first capacitor and the negative bus end is connected to the second capacitor.
3 . The electronic circuit according to claim 1 , further comprising:
an inductance device; and
an alternating-current input end connected to the rectifier module through the inductance device.
4 . The electronic circuit according to claim 3 , wherein:
the inductance device includes a first inductor, a second inductor, and a third inductor; and
the alternating-current input end includes:
a first phase input end connected to the midpoint of the first bridge arm through the first inductor;
a second phase input end connected to the midpoint of the second bridge arm through the second inductor; and
a third phase input end connected to the midpoint of the third bridge arm through the third inductor.
5 . The electronic circuit according to claim 1 , wherein each of the first bidirectional switch, the second bidirectional switch, and the third bidirectional switch includes two power switch transistors reversely connected in series to each other.
6 . The electronic circuit according to claim 1 , wherein:
each of the first bidirectional switch, the second bidirectional switch, and the third bidirectional switch includes two power switch transistors; and
the two power switch transistors are reversely connected in parallel to each other, and are each reversely connected in parallel to a diode.
7 . The electronic circuit according to claim 1 , wherein each of the first bidirectional switch, the second bidirectional switch, and the third bidirectional switch includes a fourth bridge arm, a power switch transistor, and a fifth bridge arm connected in parallel to each other.
8 . An air conditioner comprising:
an electronic circuit including:
a rectifier module including:
a three-phase rectifier bridge including a first bridge arm, a second bridge arm, and a third bridge arm connected in parallel to each other; and
a bidirectional switch assembly including:
a first bidirectional switch, one end of the first bidirectional switch being connected to a midpoint of the first bridge arm;
a second bidirectional switch, one end of the second bidirectional switch being connected to a midpoint of the second bridge arm; and
a third bidirectional switch, one end of the third bidirectional switch being connected to a midpoint of the third bridge arm;
an energy storage module connected to a direct-current output end of the rectifier module and including a first capacitor and a second capacitor connected in series to each other, the first capacitor being connected in parallel to an auxiliary power supply module and a first drive assembly, the first drive assembly being connected to and configured to drive a first direct-current fan, the second capacitor being connected in parallel to a second drive assembly, and the second drive assembly being connected to and configured to drive a second direct-current fan; and
a third drive assembly connected to the direct-current output end of the rectifier module, and connected to and configured to drive a compressor;
wherein another end of the first bidirectional switch, another end of the second bidirectional switch, and another end of the third bidirectional switch are connected between the first capacitor and the second capacitor.
9 . The air conditioner according to claim 8 , wherein:
the direct-current output end includes a positive bus end and a negative bus end;
and
the positive bus end is connected to the first capacitor and the negative bus end is connected to the second capacitor.
10 . The air conditioner according to claim 8 , wherein the electronic circuit further includes:
an inductance device; and
an alternating-current input end connected to the rectifier module through the inductance device.