Switch circuit, switched capacitor converter, and vehicle
Disclosed is a switch circuit including a switch unit including at least one switching element, and a balance circuit provided for the switch unit, the balance circuit being configured to inhibit a potential difference across the switch unit from exceeding a threshold value.
1. A switch circuit, comprising:
a switch unit including at least one switching element;
a balance circuit provided for the switch unit, the balance circuit being configured to inhibit a potential difference across the switch unit from exceeding a threshold value, wherein
the balance circuit includes:
a first switch;
a current source connected in series with the first switch;
a voltage dividing circuit configured to divide the potential difference across the switch unit to output a first divided voltage; and
a comparator configured to:
compare a reference voltage with the first divided voltage; and
control the first switch based on the comparison, and
a direct-current circuit of the first switch and the current source is connected in parallel with the switch unit; and
a second switch, wherein
the voltage dividing circuit is further configured to output a second divided voltage,
the second switch is configured to be controlled by the second divided voltage,
the second divided voltage is higher than the first divided voltage,
the second switch is configured to output a voltage, and
the voltage output from the second switch is used as a power supply voltage of the comparator.
2. A switched capacitor converter, comprising:
the switch circuit according to claim 1 ; and
at least one capacitor.
3. The switched capacitor converter according to claim 2 , further comprising a plurality of switch circuits, wherein
the plurality of switch circuits includes the switch circuit,
each switch circuit of the plurality of switch circuits includes the switch unit and the balance circuit,
the balance circuit of each switch circuit of the plurality of switch circuits has an identical circuit configuration, and
in each switch circuit of the plurality of switch circuits, circuit constants of the balance circuit are set according to a withstand voltage of the at least one switching element.
4. A vehicle, comprising:
the switched capacitor converter according to claim 2 .
5. A switch circuit-according to claim 1 , comprising:
a switch unit including at least one switching element;
a balance circuit provided for the switch unit, the balance circuit being configured to inhibit a potential difference across the switch unit from exceeding a threshold value, wherein
the balance circuit includes:
a first switch; and
a current source connected in series with the first switch, and
a direct-current circuit of the first switch and the current source is connected in parallel with the switch unit; and
an enable signal generating circuit configured to generate an enable signal by using a control signal, wherein
the control signal is for control of the switch unit, and
the balance circuit is further configured to switch between an enabled state and a disabled state based on the enable signal.
6. The switch circuit according to claim 5 , wherein
the enable signal generating circuit includes a charge storage unit, and
discharging of the charge storage unit stops when switching of the switch unit stops.
7. A switched capacitor converter, comprising:
the switch circuit according to claim 5 ; and
at least one capacitor.
8. The switched capacitor converter according to claim 7 , further comprising a plurality of switch circuits, wherein
the plurality of switch circuits includes the switch circuit,
each switch circuit of the plurality of switch circuits includes the switch unit and the balance circuit,
the balance circuit of each switch circuit of the plurality of switch circuits has an identical circuit configuration, and
in each switch circuit of the plurality of switch circuits, circuit constants of the balance circuit are set according to a withstand voltage of the at least one switching element.
9. A vehicle, comprising:
the switched capacitor converter according to claim 7 .