Semiconductor device for driving motor, three-phase motor and motor driving apparatus with the semiconductor device and fan motor
View Patent ↗In order to prevent a short circuit of top and bottom arms of a motor driving IC when noise is added to six control signals for controlling six switching elements, there is provided a semiconductor device for driving a motor, being sealed with resin as one package and comprising: six switching elements for driving a three-phase motor; three output terminals for outputting voltages to the three-phase motor; at least one driving circuit for driving the six switching elements; three control signal input terminals; and a function) of generating six control signals for control of the six switching elements based on three control signals inputted through the three control signal input terminals.
1. The semiconductor device for driving a motor being sealed with resin as one package and comprising six switching elements for driving a three-phase motor, three output terminals for outputting voltages to the three-phase motor, and at least one driving circuit for driving the six switching elements, wherein the semiconductor device comprises:
three control signal input terminals; and
a function of generating six control signals for control of the six switching elements based on three control signals inputted through the three control signal input terminals,
wherein the semiconductor device has a dead time generating function,
wherein the length of the dead time generated by the dead time generating function has positive temperature dependence.
2. The semiconductor device for driving a motor according to claim 1 , wherein the semiconductor device is formed by sealing one semiconductor chip with resin as one package.
3. The semiconductor device for driving a motor according to claim 1 , wherein:
the driving circuit, the function of generating the six control signals, and the dead time generating function are configured on at least one first semiconductor chip, and
the six switching elements are configured on at least one second semiconductor chip, and
the first semiconductor chip and the second semiconductor chip are sealed with resin as one package.
4. The semiconductor device for driving a motor according to claim 1 , wherein the dead time generating function is implemented by a circuit employing delay caused by a resistor or by on-state resistance of a MOS (Metal-Oxide Semiconductor).
5. The semiconductor device for driving a motor according to claim 1 , wherein the dead time generating function is implemented by:
a delay circuit for increasing a rising time and a falling time of each of the three control signals; and
two circuits to which an output signal of the delay circuit is inputted;
wherein the two circuits has different threshold voltages.
6. A motor driving apparatus comprising:
the semiconductor device for driving a motor according to claim 1 ; and
a controlling semiconductor device for outputting the three control signals to the semiconductor device for driving a motor.
7. The motor driving apparatus according to claim 6 , wherein the semiconductor device for driving a motor supplies power to the controlling semiconductor device.
8. The motor driving apparatus according to claim 6 , wherein the controlling semiconductor device outputs a reset signal for canceling a protective function operating state of the semiconductor device for driving a motor to the semiconductor device.
9. The motor driving apparatus according to claim 6 , wherein a protective function operating state of the semiconductor device for driving a motor is canceled by fixing at least one of the three control signals at “H” or “L”.
10. A three-phase motor comprising the motor driving apparatus according to claim 6 installed therein.
11. The semiconductor device for driving a motor according to claim 3 , further comprising a reset signal input terminal for receiving a reset signal for canceling a protective function operating state of the semiconductor device.
12. The motor driving apparatus according to claim 9 , wherein a time from the fixation of the at least one of the three control signals at “H” or “L” to the cancellation of the protective function operating state of the semiconductor device for driving a motor is a PWM cycle or more.
13. A fan motor for sending air to an indoor heat exchanger or an outdoor heat exchanger of an air conditioner having a compressor for compressing a refrigerant, the indoor heat exchanger for indoor heat exchange of the refrigerant, and the outdoor heat exchanger for outdoor heat exchange of the refrigerant, wherein:
the fan motor is implemented by the three-phase motor according to claim 10 .
14. The semiconductor device for driving a motor being sealed with resin as one package and comprising six switching elements for driving a three-phase motor, three output terminals for outputting voltages to the three-phase motor, and at least one driving circuit for driving the six switching elements, wherein the semiconductor device comprises:
three control signal input terminals; and
a function of generating six control signals for control of the six switching elements based on three control signals inputted through the three control signal input terminals,
wherein the semiconductor device has a dead time generating function,
wherein the dead time generating function generates the dead time by setting an ON delay time of each of the six control signals longer than its OFF delay time.
15. A motor driving apparatus comprising six switching elements for driving a three-phase motor, at least one driving circuit for driving the six switching elements, a function of generating six control signals for controlling the six switching elements based on three control signals, and a dead time generating function, wherein:
a protective function operating state of the motor driving apparatus is canceled by fixing at least one of the three control signals at “H” or “L”.
16. The motor driving apparatus according to claim 15 , wherein a time from the fixation of the at least one of the three control signals at “H” or “L” to the cancellation of the protective function operating state is a PWM cycle or more.
17. A semiconductor device for driving a motor, being sealed with resin as one package and comprising six switching elements for driving a three-phase motor, three output terminals for outputting voltages to the three-phase motor, and at least one driving circuit for driving the six switching elements, wherein the semiconductor device comprises:
three control signal input terminals;
a function of generating six control signals for control of the six switching elements based on three control signals inputted through the three control signal input terminals;
a dead time generating function; and
a reset signal input terminal for receiving a reset signal for canceling a protective function operating state of the semiconductor device.