Power conversion device and drive device

Abstract

A power conversion device includes a high-side transistor including an IGBT, a low-side transistor including an IGBT, and having a collector coupled to an emitter of the high-side transistor, a high-side driver configured to drive the high-side transistor; and a low-side driver configured to drive the low-side transistor, wherein each of the high-side transistor and the low-side transistor includes a first trench gate electrode arranged in an active cell region, and electrically connected to a gate, and a second trench gate electrode and a third trench gate electrode, each of which is arranged at intervals on both sides of the first trench gate electrode, and electrically connected to the emitter in the active cell region. The high-side driver includes a first pull-up transistor configured to apply a first voltage as a positive voltage to the gate, based on the emitter of the high-side transistor and a first pull-down transistor.

What is claimed is: 
     
         1 . A power conversion device comprising:
 a high-side transistor including an IGBT;   a low-side transistor including an IGBT, and having a collector coupled to an emitter of the high-side transistor;   a high-side driver configured to drive the high-side transistor; and   a low-side driver configured to drive the low-side transistor,   wherein each of the high-side transistor and the low-side transistor includes:   a first trench gate electrode arranged in an active cell region, and electrically connected to a gate; and   a second trench gate electrode and a third trench gate electrode, each of which is arranged at intervals on both sides of the first trench gate electrode, and electrically connected to the emitter in the active cell region,   wherein the high-side driver includes:   a first pull-up transistor configured to apply a first voltage as a positive voltage to the gate, based on the emitter of the high-side transistor; and   a first pull-down transistor configured to couple the gate of the high-side transistor to the emitter, and   wherein the low-side driver includes:   a second pull-up transistor configured to apply a second voltage as a positive voltage to the gate, based on the emitter of the low-side transistor; and   a second pull-down transistor configured to couple the gate of the low-side transistor to the emitter,   wherein the first pull-down transistor applies a gate-emitter voltage of about 0 V to the high-side transistor when the high-side transistor is turned off, and   wherein the second pull-down transistor applies a gate-emitter voltage of about  0  V to the low-side transistor when the low-side transistor is turned off.   
     
     
         2 . The power conversion device according to  claim 1 , further comprising:
 a transformer including a primary coil, and a first secondary coil and a second secondary coil;   an AC voltage generation circuit configured to generate an AC voltage, and apply the AC voltage to the primary coil;   a first rectifier circuit configured to rectify an AC voltage generated by the first secondary coil, and generate the first voltage in a first node based on a first reference node; and   a second rectifier circuit configured to rectify an AC voltage generated by the second secondary coil, and generate the second voltage in a second node based on a second reference node,   wherein the first reference node is coupled to the emitter of the high-side transistor and one end of the first pull-down transistor,   the first node is coupled to one end of the first pull-up transistor,   the second reference node is coupled to the emitter of the low-side transistor and one end of the second pull-down transistor, and   the second node is coupled to one end of the second pull-up transistor.   
     
     
         3 . The power conversion device according to  claim 2 , further comprising:
 a first photocoupler configured to receive an input of a first PWM signal having a lower voltage level than the first voltage and the second voltage, convert the voltage level of the first PWM signal into a voltage level according to the first voltage, and control the high-side driver by using the converted PWM signal, and   a second photocoupler configured to receive an input of a second PWM signal having a lower voltage level than the first voltage and the second voltage, convert the voltage level of the second PWM signal into a voltage level according to the second voltage, and control the low-side driver by using the converted PWM signal.   
     
     
         4 . The power conversion device according to  claim 1 , wherein each of the first voltage and the second voltage is greater than 15 V. 
     
     
         5 . The power conversion device according to  claim 1 , wherein each of the high-side transistor and the low-side transistor has a withstand voltage of 1200 V or more. 
     
     
         6 . The power conversion device according to  claim 2 , wherein each of the high-side driver, the low-side driver, the transformer, the AC voltage generation circuit, the first rectifier circuit, and the second rectifier circuit is mounted on a wiring board. 
     
     
         7 . The power conversion device according to  claim 1 , wherein each of the high-side transistor and the low-side transistor further includes:
 a first semiconductor region arranged between the first trench gate electrode and the second trench gate electrode, and in which a channel is formed;   a second semiconductor region arranged between the first trench gate electrode and the third trench gate electrode, and in which a channel is formed;   a third semiconductor region arranged on a side opposite to the first semiconductor region across the second trench gate electrode, and configured to serve as a floating node; and   a fourth semiconductor region arranged on a side opposite to the second semiconductor region across the third trench gate electrode, and configured to serve as a floating node.   
     
     
         8 . The power conversion device according to  claim 1 ,
 wherein each of the high-side transistor and the low-side transistor includes a plurality of semiconductor chips having emitter electrodes, gate electrodes and collector electrodes,   the emitter electrodes of the plurality of semiconductor chips are coupled in common, and   the collector electrodes of the plurality of semiconductor chips are coupled in common.   
     
     
         9 . A power conversion device comprising:
 a conversion unit configured to convert an AC voltage, which is externally input, into a DC voltage;   a capacitor configured to hold the DC voltage converted by the conversion unit;   an inverter unit configured to convert the DC voltage held in the capacitor into a three-phase AC voltage having a predetermined voltage and frequency; and   a drive unit configured to control the inverter unit,   wherein the inverter unit includes, with respect to each phase of the three phases,   a high-side transistor including an IGBT; and   a low-side transistor including an IGBT, and having a collector coupled to an emitter of the high-side transistor,   wherein the drive unit includes, with respect to each phase of the three phases,   a high-side driver configured to drive the high-side transistor; and   a low-side driver configured to drive the low-side transistor,   wherein each of the high-side transistor and the low-side transistor includes:   a first trench gate electrode arranged in an active cell region, and electrically connected to a gate; and   a second trench gate electrode and a third trench gate electrode, each of which is arranged at intervals on both sides of the first trench gate electrode, and electrically connected to the emitter in the active cell region,   wherein the high-side driver includes:   a first pull-up transistor configured to apply a first voltage as a positive voltage to the gate, based on the emitter of the high-side transistor; and   a first pull-down transistor configured to couple the gate of the high-side transistor to the emitter, and   wherein the low-side driver includes:   a second pull-up transistor configured to apply a second voltage as a positive voltage to the gate, based on the emitter of the low-side transistor; and   a second pull-down transistor configured to couple the gate of the low-side transistor to the emitter,   wherein the first pull-down transistor applies a gate-emitter voltage of about 0 V to the high-side transistor when the high-side transistor is turned off, and wherein the second pull-down transistor applies a gate-emitter voltage of about 0 V to the low-side transistor when the low-side transistor is turned off.   
     
     
         10 . The power conversion device according to  claim 9 ,
 wherein the drive unit further includes, with respect to each phase of the three phases,   a transformer including a primary coil, and a first secondary coil and a second secondary coil;   an AC voltage generation circuit configured to generate an AC voltage, and apply the AC voltage to the primary coil;   a first rectifier circuit configured to rectify an AC voltage generated by the first secondary coil, and generate the first voltage in a first node based on a first reference node; and   a second rectifier circuit configured to rectify an AC voltage generated by the second secondary coil, and generate the second voltage in a second node based on a second reference node,   wherein the first reference node is coupled to the emitter of the high-side transistor and one end of the first pull-down transistor,   the first node is coupled to one end of the first pull-up transistor,   the second reference node is coupled to the emitter of the low-side transistor and one end of the second pull-down transistor, and   the second node is coupled to one end of the second pull-up transistor.   
     
     
         11 . The power conversion device according to  claim 10 , wherein each of the high-side driver, the low-side driver, the transformer, the AC voltage generation circuit, the first rectifier circuit, and the second rectifier circuit is mounted on a wiring board. 
     
     
         12 . The power conversion device according to  claim 9 , wherein each of the high-side transistor and the low-side transistor further includes:
 a first semiconductor region arranged between the first trench gate electrode and the second trench gate electrode, and in which a channel is formed;   a second semiconductor region arranged between the first trench gate electrode and the third trench gate electrode, and in which a channel is formed;   a third semiconductor region arranged on a side opposite to the first semiconductor region across the second trench gate electrode, and configured to serve as a floating node; and   a fourth semiconductor region arranged on a side opposite to the second semiconductor region across the third trench gate electrode, and configured to serve as a floating node.   
     
     
         13 . The power conversion device according to  claim 9 , wherein the conversion unit receives an input of an AC voltage from a wind generator. 
     
     
         14 . A drive device including a wiring board, the wiring board comprising:
 a first drive terminal and a second drive terminal configured to drive a high-side transistor in a half-bridge circuit;   a third drive terminal and a fourth drive terminal configured to drive a low-side transistor in the half-bridge circuit;   a high-side driver including:
 a first pull-up transistor configured to apply a first voltage as a positive voltage to the first drive terminal, based on the second drive terminal; and 
 a first pull-down transistor configured to couple the first drive terminal to the second drive terminal; 
   a low-side driver including:
 a second pull-up transistor configured to apply a second voltage as a positive voltage to the third drive terminal, based on the fourth drive terminal; and 
 a second pull-down transistor configured to couple the third drive terminal to the fourth drive terminal; 
   a transformer including a primary coil, and a first secondary coil and a second secondary coil;   an AC voltage generation circuit configured to generate an AC voltage, and apply the AC voltage to the primary coil;   a first rectifier circuit configured to rectify a voltage generated by the first secondary coil, and generate the first voltage in a first node based on a first reference node;   a second rectifier circuit configured to rectify a voltage generated by the second secondary coil, and generate the second voltage in a second node based on a second reference node;   first wiring configured to couple the first reference node to the second drive terminal and one end of the first pull-down transistor;   second wiring configured to couple the first node to one end of the first pull-up transistor;   third wiring configured to couple the second reference node to the fourth drive terminal and one end of the second pull-down transistor; and   fourth wiring configured to couple the second node to one end of the second pull-up transistor,   wherein the first pull-down transistor applies a gate-emitter voltage of about 0 V to the high-side transistor when the high-side transistor is turned off, and   wherein the second pull-down transistor applies a gate-emitter voltage of about 0 V to the low-side transistor when the low-side transistor is turned off.   
     
     
         15 . The drive device according to  claim 14 , wherein the wiring board further includes:
 a first photocoupler configured to receive an input of a first PWM signal having a lower voltage level than the first voltage and the second voltage, convert the voltage level of the first PWM signal into a voltage level according to the first voltage, and control the high-side driver by using the converted PWM signal, and   a second photocoupler configured to receive an input of a second PWM signal having a lower voltage level than the first voltage and the second voltage, convert the voltage level of the second PWM signal into a voltage level according to the second voltage, and control the low-side driver by using the converted PWM signal.   
     
     
         16 . The drive device according to  claim 15 ,
 wherein the wiring board includes a first wiring region, a second wiring region and a third wiring region insulated from each other,   the first drive terminal and the second drive terminal, the high-side driver, and the first rectifier circuit are provided in the first wiring region,   the third drive terminal and the fourth drive terminal, the low-side driver, and the second rectifier circuit are provided in the second wiring region,   the AC voltage generation circuit is provided in the third wiring region,   the transformer is provided between the third wiring region, and the first wiring region and the second wiring region,   the first photocoupler is provided between the third wiring region and first wiring region, and   the second photocoupler is provided between the third wiring region and the second wiring region.   
     
     
         17 . The drive device according to  claim 14 , wherein each of the high-side transistor and the low-side transistor is an IGBT including:
 a first trench gate electrode arranged in an active cell region, and electrically connected to a gate; and   a second trench gate electrode and a third trench gate electrode, each of which is arranged at intervals on both sides of the first trench gate electrode, and electrically connected to an emitter in the active cell region.