WO2015045534A1 - 駆動回路および半導体装置 - Google Patents
駆動回路および半導体装置 Download PDFInfo
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- WO2015045534A1 WO2015045534A1 PCT/JP2014/067038 JP2014067038W WO2015045534A1 WO 2015045534 A1 WO2015045534 A1 WO 2015045534A1 JP 2014067038 W JP2014067038 W JP 2014067038W WO 2015045534 A1 WO2015045534 A1 WO 2015045534A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/162—Modifications for eliminating interference voltages or currents in field-effect transistor switches without feedback from the output circuit to the control circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0063—High side switches, i.e. the higher potential [DC] or life wire [AC] being directly connected to the switch and not via the load
Definitions
- the present invention relates to a drive circuit and a semiconductor device, and more particularly, to a drive circuit and a semiconductor device that drive a high-side power device of two power devices connected in a totem pole connection.
- HV driver IC HVIC
- HVIC high-side drive circuit
- the HV driver IC includes a pulse generation circuit that generates a signal for turning on or off the high-side power device, a level shift circuit, and a high-side power device that drives the high-side power device by a signal transmitted through the level shift circuit.
- Side drive circuit shifts the level of the signal generated by the pulse generation circuit with reference to the ground potential and transmits it to the high side drive circuit installed on the high side. At this time, the level shift circuit generates a signal having an amplitude that changes between the ground potential and the high-side power supply potential of the HV driver IC.
- the high-side drive circuit receives the voltage having such an amplitude and drives the high-side power device on or off.
- the connection point between the low-side power device and the high-side power device that is, the midpoint of the totem pole is connected to the load.
- the midpoint potential of the totem pole becomes an overshoot or undershoot state, so the midpoint potential of the totem pole becomes a potential higher than the high-voltage potential of the high-side power device or a potential lower than the ground potential. It becomes.
- the level shift circuit normally transmits the signal to the high-side drive circuit. You will not be able to. In that case, the high-side power device cannot be turned off at the timing to be turned off and remains on, or cannot be turned on at the timing to be turned on and remains off, thereby maintaining the original switching function. You will not be able to.
- a technique corresponding to the fact that it cannot be turned off at the timing to be turned off for example, refer to Patent Document 1
- a technique corresponding to the fact that it cannot be turned on at the timing to be turned on for example, Patent Document 2. See).
- the second off-pulse signal is output after a predetermined time has elapsed since the first off-pulse signal was output. Thereby, even if the first off-pulse signal cannot be normally transmitted to the level shift circuit, the second off-pulse signal can be normally transmitted to the level shift circuit.
- the second on-pulse signal is output after a predetermined time has elapsed since the first on-pulse signal was output. Thereby, even if the first on-pulse signal cannot be normally transmitted to the level shift circuit, the second on-pulse signal can be normally transmitted to the level shift circuit.
- the second off or on pulse signal is only mechanically output after a predetermined time has elapsed since the first off or on pulse signal was output. For this reason, there is a possibility that new external noise may be generated even when a predetermined time has elapsed, so that a problem remains that the malfunction cannot be completely avoided essentially.
- the present invention has been made in view of such points, and a drive circuit that can reliably avoid malfunction even when a signal for turning off or on a high-side power device cannot be normally transmitted by a level shift circuit. Another object is to provide a semiconductor device.
- the drive circuit includes a high-side drive circuit that drives the high-side power device, a set signal that turns on the high-side power device based on the first edge and the second edge of the logical input signal that are input from the outside, and an off-state Detected by a pulse generation circuit that generates a reset signal, a level shift circuit that transmits a set signal and a reset signal to a high-side drive circuit, a high-side potential detection circuit that detects a high-side potential, and a high-side potential detection circuit A high-side potential determination circuit that outputs an event signal based on a change in the high-side potential, and the pulse generation circuit resets in response to the event signal output from the high-side potential determination circuit and a logical input signal input from the outside. It is characterized by regenerating.
- the high-side potential determination circuit outputs an event signal based on the change in the high-side potential, and again receives a reset signal according to the event signal and a logical input input from the outside. Generated. As a result, the high-side power device that should have transitioned to the off state can be reliably controlled to the off state.
- the drive circuit and the semiconductor device configured as described above are configured so as to regenerate the reset signal by determining when the level shift circuit cannot normally transmit the set or reset signal for turning on or off the high-side power device. Therefore, there is an advantage that malfunction can be prevented functionally. Further, the set signal can be regenerated in the same manner, and malfunction can be prevented functionally.
- FIG. 1 is a circuit diagram showing a semiconductor device according to a first embodiment. It is a circuit diagram which shows an example of a pulse generation circuit. It is a circuit diagram showing an example of a rising edge trigger circuit. It is a circuit diagram which shows an example of a high side electric potential determination circuit. It is a figure which shows the principal part waveform at the time of the normal switching operation
- FIG. 1 is a circuit diagram showing a semiconductor device according to the first embodiment
- FIG. 2 is a circuit diagram showing an example of a pulse generation circuit
- FIG. 3 is a circuit diagram showing an example of a rising edge trigger circuit
- FIG. It is a circuit diagram which shows an example of an electric potential determination circuit.
- the semiconductor device according to the first embodiment has a high-side power device HQ and a low-side power device LQ that are totem-pole connected.
- the high-side power device HQ and the low-side power device LQ are each configured by a power MOS transistor, but may be another device such as an IGBT (Insulated Gate Gate Bipolar Transistor).
- the drain of the high side power device HQ is connected to the positive terminal of the high voltage power supply 10, and the source of the low side power device LQ and the negative terminal of the high voltage power supply 10 are connected to the ground GND.
- the source of the low side power device LQ may be connected to the ground GND through a resistor.
- a connection point between the source of the high-side power device HQ and the drain of the low-side power device LQ, that is, the midpoint of the totem pole is connected to the load 11.
- the gate of the high-side power device HQ is connected to the output terminal HO of the high-side drive circuit 12 (the high-side output signal that is the potential signal is also referred to as HO), and the gate of the low-side power device LQ is the gate of the low-side drive circuit 13.
- the high-side drive circuit 12 has a reference potential terminal connected to the midpoint of the totem pole and the negative terminal of the high-side power supply 14, and a power supply terminal connected to the positive terminal of the high-side power supply 14.
- the reference potential terminal of the low-side drive circuit 13 is connected to the ground GND and the negative terminal of the low-side power supply 15, and the power supply terminal is connected to the positive terminal of the low-side power supply 15.
- the low side power supply potential is indicated by VCC with reference to the ground GND
- the high side reference potential and the high side power supply potential are indicated by VS and VB with respect to the ground GND, respectively.
- the semiconductor device also includes a pulse generation circuit 16, a level shift circuit 17, a high side potential detection circuit 18, and a high side potential determination circuit 19.
- the pulse generation circuit 16 receives a logic input signal HIN for high side control from the outside, and generates a set signal SET and a reset signal RESET.
- the pulse generation circuit 16 includes a rising edge trigger circuit 20 that receives a logic input signal HIN and outputs a set signal SET.
- the pulse generation circuit 16 also includes an inverter 21, a rising edge trigger circuit 22, an OR circuit 23, and an AND circuit 24.
- the input of the inverter 21 is connected to the input terminal of the logic input signal HIN, and the output of the inverter 21 is connected to the input of the rising edge trigger circuit 22 and one input of the AND circuit 24.
- the output of the rising edge trigger circuit 22 is connected to one input of the OR circuit 23, and the output of the OR circuit 23 constitutes the output terminal of the reset signal RESET.
- the other input of the AND circuit 24 is connected to the input terminal of the event signal EVENT output from the high side potential determination circuit 19, and the output of the AND circuit 24 is connected to the other input of the OR circuit 23.
- the rising edge trigger circuit 20 includes an inverter 25 whose input is connected to the input terminal of the logic input signal HIN.
- the output of the inverter 25 is connected to the gates of the nMOS transistor 26 and the pMOS transistor 27.
- the source of the nMOS transistor 26 is connected to the ground GND, and the drain of the nMOS transistor 26 is connected to the drain of the pMOS transistor 27.
- the source of the pMOS transistor 27 is connected to the positive terminal of the low-side power supply 15 that supplies the low-side power supply potential VCC.
- the output of the inverter circuit composed of the nMOS transistor 26 and the pMOS transistor 27 is connected to one end of a capacitor 28, and the other end of the capacitor 28 is connected to the ground GND.
- the output of the inverter circuit is also connected to one input of the comparator 29.
- the other input of the comparator 29 is connected to the positive terminal of the reference voltage source 30, and the negative terminal of the reference voltage source 30 is connected to the ground GND.
- the output of the comparator 29 is connected to the input of the inverter 31, the output of the inverter 31 is connected to one input of the AND circuit 32, and the other input of the AND circuit 32 is connected to the input terminal of the logic input signal HIN. Has been.
- the output of the AND circuit 32 constitutes an output terminal that outputs a set signal SET.
- the input of the rising edge trigger circuit 22 is a signal obtained by logically inverting the logic input signal HIN, and the output is a reset signal RESET via the OR circuit 23.
- the pulse generation circuit 16 receives a logic input signal HIN for high side control from the outside.
- the logic input signal LIN for low side control is directly input to the low side drive circuit 13 from the outside. .
- the level shift circuit 17 has high breakdown voltage MOS transistors HVN1, HVN2, resistors LSR1, LSR2, and clamping diodes D1, D2.
- the gates of the MOS transistors HVN1 and HVN2 are connected to the set signal output terminal and the reset signal output terminal of the pulse generation circuit 16, respectively.
- the drains of the MOS transistors HVN1 and HVN2 are connected to one ends of the resistors LSR1 and LSR2, respectively, and the other ends of the resistors LSR1 and LSR2 are connected to the power supply terminal of the high side drive circuit 12.
- connection point between the drains of the MOS transistors HVN1 and HVN2 and the resistors LSR1 and LSR2 is connected to the input terminal of the high-side drive circuit 12 and to the cathode terminals of the diodes D1 and D2.
- the anode terminals of the diodes D1 and D2 are connected to the midpoint of the totem pole.
- the sources of the MOS transistors HVN1 and HVN2 are connected to the ground GND.
- the high-side potential detection circuit 18 detects a high-side potential, in the illustrated example, a high-side reference potential VS.
- a resistive field plate (RFP) is used as a detection means.
- This resistive field plate is formed for the purpose of electric field relaxation in a high-voltage region HVJT (High Voltage-Junction-Terminal) in a high-voltage circuit device of a high side circuit (for example, International Publication No. 2013/0669408). reference).
- the high-side potential detection circuit 18 is divided into two resistors RFP1 and RFP2 by providing a branch point in the resistive field plate, one terminal is connected to the midpoint of the totem pole, and the other terminal is connected to the ground GND. It is connected.
- a branch point of the resistive field plate is connected to an input terminal of the high-side potential determination circuit 19 so as to output a detection signal SENSE representing a change in the high-side reference potential VS.
- the high-side potential determination circuit 19 receives the detection signal SENSE detected by the high-side potential detection circuit 18, and determines whether the high-side potential, here, the high-side reference potential VS is changed by the influence of external noise. A signal EVENT for determination is generated. As shown in FIG. 4, the high-side potential determination circuit 19 includes two protection diodes 41 and 42, a comparator 43, a reference voltage source 44, an inverter 45, and a rising edge trigger circuit 46. ing. The high side potential determination circuit 19 is installed on the low side potential side with respect to the potential of the ground GND together with the high side potential detection circuit 18.
- the input terminal of the detection signal SENSE is connected to the cathode of the protective diode 41, the anode of the protective diode 42, and one input of the comparator 43.
- the anode of the protection diode 41 is connected to the ground GND, and the cathode of the protection diode 42 is connected to the low side power supply potential VCC.
- the other input of the comparator 43 is connected to the positive terminal of the reference voltage source 44, and the negative terminal of the reference voltage source 44 is connected to the ground GND.
- the output of the comparator 43 is connected to the input of the rising edge trigger circuit 46 via the inverter 45, and the output of the rising edge trigger circuit 46 constitutes an output terminal for outputting the event signal EVENT.
- the rising edge trigger circuit 46 has the same circuit configuration as that of the rising edge trigger circuit 20 shown in FIG. 3. Therefore, the following description of the operation of the rising edge trigger circuit 46 will be made with reference to FIG. .
- the input of the rising edge trigger circuit 46 becomes an inverted signal of the output signal MPLS of the comparator 43, and the output becomes the event signal EVENT.
- FIG. 5 is a diagram showing a main part waveform during a normal switching operation of the semiconductor device
- FIG. 6 is a diagram showing a main part waveform of the switching operation due to external noise of the semiconductor device.
- a logic input signal HIN for high side control is input to the pulse generation circuit 16, and a logic input signal LIN for low side control is input to the low side drive circuit 13.
- the logic input signal HIN and the logic input signal LIN are set with dead time so that the high-side power device HQ and the low-side power device LQ are not turned on at the same time.
- the rising edge trigger circuit 20 When the logic input signal HIN is input, in the pulse generation circuit 16, the rising edge trigger circuit 20 outputs a set signal SET triggered by the rising edge of the logic input signal HIN (high (H on the rising edge of HIN in FIG. 5). ) See SET for level). That is, in the rising edge trigger circuit 20 of FIG. 3, when the logic input signal HIN is at the low (L) level, the output of the inverter 25 is at the H level, and the nMOS transistor 26 is turned on (the pMOS transistor 27 is turned off). ing. As a result, since the capacitor 28 is discharged, the output of the comparator 29 is L level and the output of the inverter 31 is H level.
- the AND circuit 32 is L level.
- the set signal SET is output.
- the AND circuit 32 receiving the H level from the inverter 31 outputs an H level set signal SET.
- the output of the inverter 25 becomes L level
- the pMOS transistor 27 is turned on (the nMOS transistor 26 is turned off), and the capacitor 28 is charged.
- the output of the comparator 29 becomes H level and the output of the inverter 31 becomes L level.
- the AND circuit 32 blocks the logic input signal HIN at the H level and outputs the set signal SET at the L level. That is, the set signal SET is output as a pulse signal having a predetermined time width.
- the MOS transistor HVN1 of the level shift circuit 17 When the set signal SET is output, the MOS transistor HVN1 of the level shift circuit 17 is turned on, and when the high side drive circuit 12 detects a voltage drop at the connection point between the resistor LSR1 and the MOS transistor HVN1, the high side output signal HO Becomes a high potential state from the high side reference potential VS. As a result, the high side power device HQ transitions to an on state (at this time, the low side power device LQ is in an off state), and the high side reference potential VS is increased to supply current to the load 11.
- the rising edge trigger circuit 22 outputs the reset signal RESET triggered by the rising edge of the logic input signal HIN inverted by the inverter 21. That is, as shown in FIG. 5, the pulse generation circuit 16 generates the reset signal RESET using the falling edge of the logic input signal HIN as a trigger, and the reset signal RESET is output via the OR circuit 23.
- the MOS transistor HVN2 of the level shift circuit 17 When the H level reset signal RESET is output, the MOS transistor HVN2 of the level shift circuit 17 is turned on, and when the high side drive circuit 12 detects a voltage drop at the connection point between the resistor LSR2 and the MOS transistor HVN2, the high side The output signal HO returns to the high side reference potential VS. Accordingly, the high side power device HQ is turned off, and the high side reference potential VS becomes a potential corresponding to the state of the low side power device LQ. That is, the high-side reference potential VS decreases to the level of the ground GND when the low-side power device LQ transitions to the on state.
- the high side potential determination circuit 19 monitors the change in the high side reference potential VS, and the absolute value of the high side reference potential VS is the reference potential REF1 of the reference voltage source 44. If exceeded, an event signal EVENT is output.
- the high-side reference potential VS is at the level of the ground GND
- the 0-volt detection signal SENSE is input to the high-side potential determination circuit 19, and the output signal MPLS of the comparator 43 is at the H level. ing.
- the output of the inverter 45 becomes L level
- the rising edge trigger circuit 46 outputs the event signal EVENT of L level by the AND circuit 32 (see FIG. 3) arranged in the output stage.
- the output signal MPLS of the comparator 43 is output. Becomes L level.
- the output of the inverter 45 transitions to the H level, which is detected by the rising edge trigger circuit 46, and a pulse signal having a predetermined time width is output as the event signal EVENT.
- the event signal EVENT generated during the period when the logic input signal HIN is at the H level the output of the inverter 21 is at the L level, so that it does not participate in the control of the high side power device HQ.
- the set signal SET is generated with the rising edge of the logic input signal HIN as a trigger, and this is transmitted to the high side drive circuit 12 via the level shift circuit 17.
- the high-side power device HQ is turned on, the high-side reference potential VS is increased, and the change is detected by the high-side potential detection circuit 18 and the high-side potential determination circuit 19 to generate the event signal EVENT. Is done. Up to this point, the operation is the same as that of the normal switching operation described with reference to FIG.
- a reset signal RESET pulse P1 in FIG. 6
- the reset signal RESET is transmitted to the high side drive circuit 12 via the level shift circuit 17, and the high side output signal HO is transferred to the high side power device at time t1, as indicated by a broken line in FIG. It becomes a signal for transitioning the HQ to the OFF state.
- the potential at the connection point between the resistor LSR2 and the MOS transistor HVN2 is a reference power source (not shown) provided in the high-side drive circuit 12 to determine the potential (a voltage based on the high-side reference potential VS).
- the level shift circuit 17 cannot normally transmit the reset signal RESET to the high side drive circuit 12, and the high side power device HQ continues to be in the ON state. Will end up.
- the high-side potential determination circuit 19 monitors the high-side reference potential VS detected by the high-side potential detection circuit 18.
- the comparator 43 generates the output signal MPLS (pulse P2 in FIG. 6).
- the output signal MPLS is logically inverted by the inverter 45 and then supplied to the rising edge trigger circuit 46, and an event signal EVENT (pulse P3 in FIG. 6) having a predetermined time width is generated by using the falling edge of the output signal MPLS as a trigger.
- the event signal EVENT is supplied to the pulse generation circuit 16, and the pulse generation circuit 16 generates the reset signal RESET again.
- an L-level logic input signal HIN is input to the logic input terminal of the pulse generation circuit 16 in FIG. 2, and an H-level event signal EVENT is input to the input terminal that receives the signal from the high-side potential determination circuit 19. Entered.
- the reset signal RESET (FIG. 6 pulses P4) are output.
- the high side drive circuit 12 receives the transmitted reset signal RESET (pulse P4), sets the high side output signal HO to the high side reference potential VS at time t2, and turns off the high side power device HQ.
- the subsequent operations in FIG. 6 are the same as those described with reference to FIG.
- the pulse generation circuit 12 uses the event signal EVENT and the logic input signal HIN to The reset signal RESET is regenerated by determining the signal transmission failure.
- the determination in the high-side potential determination circuit 19 detects the change in potential in the direction in which the high-side reference potential VS returns to normal, and generates the event signal EVENT, so that the reset signal RESET regenerated thereafter is Thus, the high-side drive circuit 12 can be reliably transmitted. As a result, the high-side power device HQ can be surely turned off even if it is slightly delayed from the original transition timing to the off-state.
- the pulse generation circuit 16 generates the set signal SET when the logical input signal HIN becomes H level because the event signal EVENT is not related to the generation of the set signal SET.
- the reset signal RESET is generated when the logic input signal HIN falls from the H level to the L level, and at the same time, generated when the event signal EVENT is input.
- the AND circuit 24 blocks the input of the event signal EVENT so that the reset signal RESET is not generated. Therefore, the logic input signal HIN is prioritized and the set signal SET is generated.
- FIG. 7 is a circuit diagram showing a semiconductor device according to the second embodiment.
- the same or equivalent components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the configuration of the high-side potential detection circuit 18a and the high-side potential to be detected are changed as compared with the semiconductor device according to the first embodiment. Yes. That is, the high side potential detection circuit 18a uses the high side power supply potential VB as the detection target as the high side potential.
- the high-side power supply potential VB is obtained by shifting the high-side reference potential VS by the potential of the high-side power supply 14, and changes in the same manner following the high-side reference potential VS. Therefore, even if the high side potential detection circuit 18a monitors the high side power supply potential VB, the high side reference potential VS is monitored.
- the high-side potential detection circuit 18a has an NPN-type bipolar transistor 51, and its emitter is connected to the line of the high-side power supply potential VB.
- the base of the bipolar transistor 51 is connected to the positive terminal of the voltage source 52, and the negative terminal of the voltage source 52 is connected to the ground GND.
- the collector of the bipolar transistor 51 is connected to one end of the resistor 53, the other end of the resistor 53 is connected to the positive terminal of the voltage source 54, and the negative terminal of the voltage source 54 is connected to the ground GND.
- the collector of the bipolar transistor 51 constitutes the output of the high side potential detection circuit 18a and outputs the detection signal SENSE.
- the bipolar transistor 51 has a base-emitter potential Vbe having a reverse breakdown voltage corresponding to the high breakdown voltage of the high side circuit.
- the bipolar transistor 51 detects it. That is, normally, the potential of the high-side power supply 14 higher than the potential of the voltage source 52 is applied to the emitter of the bipolar transistor 51 even if the high-side power supply potential VB is the lowest. Therefore, the bipolar transistor 51 is in an OFF state, and a signal having a potential level of the voltage source 54 is output as the detection signal SENSE.
- the bipolar transistor 51 When the high side reference potential VS fluctuates and the high side power supply potential VB further falls below the potential obtained by subtracting the forward potential between the base and emitter of the bipolar transistor 51 from the potential of the voltage source 52, the bipolar transistor 51 is turned on. Transition to. As a result, the high side potential detection circuit 18a outputs an L level detection signal SENSE.
- the decrease in the high-side power supply potential VB is detected by the NPN-type bipolar transistor 51.
- a configuration using a PNP-type bipolar transistor is also possible. That is, when the high side power supply potential VB changes from the potential of the positive terminal of the voltage source 52 to the potential obtained by adding the forward potential between the base and the emitter of the PNP type bipolar transistor, it switches to the on state or the off state. If configured as described above, detection may be performed by a PNP-type bipolar transistor.
- FIG. 8 is a circuit diagram showing a configuration example of the high-side potential determination circuit of the semiconductor device according to the third embodiment
- FIG. 9 shows a waveform of a main part during the switching operation of the semiconductor device according to the third embodiment.
- This high side potential determination circuit 19a has a capacitor 61 having one end connected to the input terminal of the detection signal SENSE. Since the detection signal SENSE is input through the capacitor 61, the high side potential determination circuit 19a constitutes a ⁇ dV / dt detection circuit (differential circuit). The other end of the capacitor 61 is connected to the cathode of the protective diode 62 and the anode of the protective diode 63, the anode of the protective diode 62 is connected to the ground GND, and the cathode of the protective diode 63 is the low-side power supply. It is connected to the potential VCC.
- Resistors 64 and 65 are connected in parallel to the protection diode 62 and the protection diode 63, respectively.
- the connection point of the resistors 64 and 65 is connected to one input of the comparator 66, the other input of the comparator 66 is connected to the positive terminal of the reference voltage source 67, and the negative terminal of the reference voltage source 67 is connected to the ground. Connected to GND.
- the connection point of the resistors 64 and 65 is also connected to one input of another comparator 68, the other input of the comparator 68 is connected to the positive terminal of the reference voltage source 69, and the negative electrode of the reference voltage source 69. The terminal is connected to the ground GND.
- the outputs of the comparators 66 and 68 are each connected to the input of the OR circuit 70, and the output of the OR circuit 70 constitutes the output terminal of the event signal EVENT. Note that an output terminal of the high-side potential detection circuit 18 in FIG. 1 or the high-side potential detection circuit 18a in FIG. 7 is connected to an input terminal of the detection signal SENSE.
- the potential of the terminal of the capacitor 61 opposite to the input terminal of the detection signal SENSE is shown as the potential signal CS in FIG. 8, and the detection signal SENSE maintains a constant value.
- the low-side power supply potential VCC is fixed by the potential divided by the resistors 64 and 65.
- the steady-state potential signal CS has a value that is half of the low-side power supply potential VCC.
- the reference voltage source 67 of the comparator 66 has a reference potential REF2
- the reference voltage source 69 of the comparator 68 has a reference potential REF3, which has a relationship of REF2> CS> REF3.
- the comparator 66 outputs the L level output signal PPLS, and the comparator 68 outputs the L level output signal MPLS. .
- the output of the OR circuit 70 outputs an event signal EVENT of L level.
- the high side reference potential VS is set to the positive side.
- This change in the high-side reference potential VS is detected by the high-side potential detection circuit 18 or 18a, and is input to the high-side potential determination circuit 19a as a detection signal SENSE.
- the potential signal CS has a waveform on which the differential (dV / dt) signal changed to the plus side is superimposed.
- the comparator 66 that detects a change on the plus side detects the change in the potential signal CS, outputs an H level output signal PPLS, and outputs it from the OR circuit 70 as an event signal EVENT.
- the high side power device HQ When the reset signal RESET is output in response to the fall of the logic input signal HIN, the high side power device HQ is turned off, and the high side reference potential VS changes to the negative side.
- This change in the high-side reference potential VS is detected by the high-side potential detection circuit 18 or 18a, and is input to the high-side potential determination circuit 19a as a detection signal SENSE.
- the potential signal CS has a waveform on which the differential signal changed to the minus side is superimposed.
- the comparator 68 that detects the change on the minus side detects the change in the potential signal CS, outputs the H level output signal MPLS, and outputs it from the OR circuit 70 as the event signal EVENT.
- the comparators 66 and 68 are connected to the potential signal even when the external noises N1 and N2 are superimposed on the high-side reference potential VS. Detect CS ⁇ dV / dt.
- the detected output signals PPLS and MPLS are logically ORed and output as an event signal EVENT.
- FIG. 10 is a circuit diagram showing a configuration example of the high-side potential determination circuit of the semiconductor device according to the fourth embodiment.
- the high side potential determination circuit 19b is configured by combining the high side potential determination circuit 19 of FIG. 4 and the high side potential determination circuit 19a of FIG.
- the input terminal of the detection signal SENSE is connected to the inputs of the high side potential determination circuits 19 and 19a
- the outputs of the high side potential determination circuits 19 and 19a are connected to the inputs of the OR circuit 71, respectively.
- the output of the OR circuit 71 constitutes the output terminal of the high side potential determination circuit 19b and outputs the event signal EVENT.
- the high side potential determination circuit 19b can have a characteristic that combines these characteristics by combining the high side potential determination circuit 19 and the high side potential determination circuit 19a. Since the high-side potential determination circuit 19 directly detects the high-side reference potential VS with its absolute value, it can be confirmed that the high-side reference potential VS has changed, while the resistance value and the internal There is a possibility that an operation delay is caused by the parasitic capacitance. On the other hand, since the high side potential determination circuit 19a detects only a voltage change, it can quickly detect a change in the high side reference potential VS. Therefore, the high side potential determination circuit 19b can quickly and reliably detect a change in the high side reference potential VS.
- the high-side potential determination circuit 19b has an OR circuit 71 disposed at the outputs of the high-side potential determination circuit 19 and the high-side potential determination circuit 19a, but can also be configured by an AND circuit. .
- the reset signal RESET when the high-side power device HQ in the on state cannot be controlled to the off state, the reset signal RESET is regenerated and reliably controlled to the off state.
- the reset signal RESET is regenerated but also the set signal SET can be regenerated when the off-state high-side power device HQ cannot be turned on.
- FIG. 11 is a circuit diagram illustrating a configuration example of a high-side potential determination circuit of a semiconductor device according to the fifth embodiment.
- FIG. 12 is a circuit diagram illustrating a configuration example of a pulse generation circuit of the semiconductor device according to the fifth embodiment.
- FIG. 13 and FIG. 13 are diagrams showing operation waveforms of main parts of the semiconductor device according to the fifth embodiment. 11 and 12, the same or equivalent components as those shown in FIGS. 4 and 2 are denoted by the same reference numerals.
- the high-side potential determination circuit 19c and the pulse generation circuit 16 of the semiconductor device according to the first embodiment shown in FIG. The circuit 16a is changed.
- the high-side potential determination circuit 19c has a rising edge trigger circuit 46a added to the high-side potential determination circuit 19 shown in FIG. That is, the input of the rising edge trigger circuit 46a is connected to the output of the comparator 43, the output of the rising edge trigger circuit 46 is the event signal EVENT1, and the output of the rising edge trigger circuit 46a is the output terminal of the event signal EVENT2. It has become.
- the rising edge trigger circuit 46 and the rising edge trigger circuit 46a have the same circuit configuration as the rising edge trigger circuit 20 shown in FIG.
- the pulse generation circuit 16a has an OR circuit 23a and an AND circuit 24a added to the pulse generation circuit 16 shown in FIG. That is, the AND circuit 24a has one input connected to the input terminal of the logic input signal HIN, the other input connected to the input terminal of the event signal EVENT2, and the output connected to one input of the OR circuit 23a. Yes.
- the OR circuit 23a connects the other input to the output of the rising edge trigger circuit 20, and the output constitutes the output terminal of the set signal SET.
- One input of the AND circuit 24 is connected to the input terminal of the event signal EVENT1.
- the high-side power device HQ transitions to the OFF state even though the rising edge trigger circuit 22 generates the reset signal RESET (pulse P11 in FIG. 13) triggered by the falling edge of the logic input signal HIN. If not, the operation is the same as that in the above embodiment. That is, the high-side potential determination circuit 19c determines the lowered state of the high-side reference potential VS, which is the cause that the reset signal RESET is not transmitted to the high-side drive circuit 12, and outputs the event signal EVENT1 (pulse P12 in FIG. 13). To do.
- the pulse generation circuit 16a receives the event signal EVENT1 and regenerates the reset signal RESET (pulse P13 in FIG. 13).
- the rising edge trigger circuit 20 generated the set signal SET (pulse P14 in FIG. 13) using the rising edge of the logic input signal HIN as a trigger, the high side power device HQ did not transition to the ON state.
- the set signal SET when the set signal SET is generated, external noise is superimposed on the high-side reference potential VS, and the set signal SET is not normally transmitted to the high-side drive circuit 12.
- the set signal SET is generated, if the high-side potential detection circuit 18 detects a change in potential due to the change in the high-side reference potential VS, more precisely, the set signal SET is generated and the high-side reference potential VS is raised.
- the rising edge trigger circuit 46a of the high side potential determination circuit 19c When the reverse falling is detected although it must be raised, the rising edge trigger circuit 46a of the high side potential determination circuit 19c generates the event signal EVENT2 (pulse P15 in FIG. 13).
- the pulse generation circuit 16a at this time has the logic input signal HIN at the H level, so the AND circuit 24a outputs an H level signal, and the OR circuit 23a outputs the set signal SET ( Re-output as pulse P16) in FIG.
- the high-side power device HQ transitions to the on state.
- FIG. 14 is a circuit diagram showing a configuration example of a high-side potential determination circuit of a semiconductor device according to the sixth embodiment
- FIG. 15 is a diagram showing operation waveforms of main parts of the semiconductor device according to the sixth embodiment.
- the same or equivalent components as those shown in FIG. 8 are denoted by the same reference numerals.
- the high-side potential determination circuit 19a of the semiconductor device according to the third embodiment shown in FIG. 8 is changed to a high-side potential determination circuit 19d and added to the reset signal RESET.
- the set signal SET can also be regenerated. Therefore, the output of the comparator 66 is used as an output terminal for the event signal EVENT1, and the output of the comparator 68 is used as an output terminal for the event signal EVENT2.
- the comparator 66 outputs the L-level event signal EVENT1
- the comparator 68 outputs the L-level event signal EVENT2.
- the high side reference potential VS changes to the plus side. To do.
- This change in the high-side reference potential VS is detected by the high-side potential detection circuit 18 or 18a and is input to the high-side potential determination circuit 19d as a detection signal SENSE.
- the potential signal CS has a waveform on which the differential signal changed to the plus side is superimposed.
- the comparator 66 that detects a change on the plus side detects the change in the potential signal CS and outputs an H-level event signal EVENT1.
- the high side power device HQ When the reset signal RESET is output in response to the fall of the logic input signal HIN, the high side power device HQ is turned off, and the high side reference potential VS changes to the negative side.
- This change in the high-side reference potential VS is detected by the high-side potential detection circuit 18 or 18a and is input to the high-side potential determination circuit 19d as a detection signal SENSE.
- the potential signal CS has a waveform on which the differential signal changed to the minus side is superimposed.
- the comparator 68 that detects the change on the minus side detects the change in the potential signal CS and outputs the H-level event signal EVENT2.
- the comparators 66 and 68 detect ⁇ dV / dt of the potential signal CS and output event signals EVENT1 and EVENT2.
- the reset signal RESET signal is regenerated in response to the event signal EVENT2.
- the logic input signal HIN is at the L level, that is, high
- the event signal EVENT2 is output (corresponding to the pulse P15 in FIG. 13), and the logic input signal HIN may transition to the H level at that timing. In such a case, the pulse generation circuit 16 regenerates the set signal SET.
- the two high-side potential determination circuits 19 and 19a receive the common detection signal SENSE.
- one of the high side potential determination circuits 19 and 19a may receive the output of the high side potential detection circuit 18 of FIG. 1, and the other may receive the output of the high side potential detection circuit 18a of FIG.
- the constituent elements of the plurality of embodiments can be appropriately combined and implemented within a consistent range.
Abstract
Description
このような駆動回路および半導体装置によれば、ハイサイド電位判定回路がハイサイド電位の変化に基づくイベント信号を出力し、イベント信号と外部から入力された論理入力に応じて、再度、リセット信号を生成するようにした。これにより、オフ状態に遷移すべきであったハイサイドパワーデバイスを確実にオフ状態に制御することができる。
パルス生成回路16は、外部からハイサイド制御用の論理入力信号HINを入力し、セット信号SETおよびリセット信号RESETを生成する。具体的には、図2に示したように、パルス生成回路16は、論理入力信号HINを入力し、セット信号SETを出力する立上りエッジトリガ回路20を備えている。パルス生成回路16は、また、インバータ21と、立上りエッジトリガ回路22と、OR回路23と、AND回路24とを備えている。インバータ21の入力は、論理入力信号HINの入力端子に接続され、インバータ21の出力は、立上りエッジトリガ回路22の入力とAND回路24の一方の入力とに接続されている。立上りエッジトリガ回路22の出力は、OR回路23の一方の入力に接続され、OR回路23の出力は、リセット信号RESETの出力端子を構成している。AND回路24の他方の入力は、ハイサイド電位判定回路19から出力されるイベント信号EVENTの入力端子に接続され、AND回路24の出力は、OR回路23の他方の入力に接続されている。
図5は半導体装置の通常のスイッチング動作時における要部波形を示す図、図6は半導体装置の外来ノイズによるスイッチング動作の要部波形を示す図である。
このハイサイド電位判定回路19bは、図4のハイサイド電位判定回路19および図8のハイサイド電位判定回路19aを組み合わせて構成している。すなわち、ハイサイド電位判定回路19,19aの入力には、検出信号SENSEの入力端子が接続され、ハイサイド電位判定回路19,19aの出力は、それぞれOR回路71の入力に接続されている。OR回路71の出力は、ハイサイド電位判定回路19bの出力端子を構成し、イベント信号EVENTを出力する。
11 負荷
12 ハイサイド駆動回路
13 ローサイド駆動回路
14 ハイサイド電源
15 ローサイド電源
16,16a パルス生成回路
17 レベルシフト回路
18,18a ハイサイド電位検出回路
19,19a,19b,19c,19d ハイサイド電位判定回路
20 立上りエッジトリガ回路
21 インバータ
22 立上りエッジトリガ回路
23,23a OR回路
24,24a AND回路
25 インバータ
26 nMOSトランジスタ
27 pMOSトランジスタ
28 コンデンサ
29 比較器
30 基準電圧源
31 インバータ
32 AND回路
41,42 保護用ダイオード
43 比較器
44 基準電圧源
45 インバータ
46,46a 立上りエッジトリガ回路
51 バイポーラトランジスタ
52 電圧源
53 抵抗
54 電圧源
61 コンデンサ
62,63 保護用ダイオード
64,65 抵抗
66 比較器
67 基準電圧源
68 比較器
69 基準電圧源
70,71 OR回路
Claims (14)
- ハイサイドパワーデバイスを駆動するハイサイド駆動回路と、
外部から入力された論理入力信号の第1のエッジおよび第2のエッジに基づいて前記ハイサイドパワーデバイスをオンさせるセット信号およびオフさせるリセット信号を生成するパルス生成回路と、
前記セット信号および前記リセット信号を前記ハイサイド駆動回路に伝達するレベルシフト回路と、
ハイサイド電位を検出するハイサイド電位検出回路と、
前記ハイサイド電位検出回路が検出した前記ハイサイド電位の変化に基づきイベント信号を出力するハイサイド電位判定回路と、
を備え、前記ハイサイド電位判定回路が出力した前記イベント信号と前記論理入力信号に応じて前記パルス生成回路は前記リセット信号を再生成するようにしたことを特徴とする駆動回路。 - 前記イベント信号が、前記論理入力信号によって定まる通常の状態では発生しないときに生成されると、前記パルス生成回路は前記リセット信号を再生成するようにしたことを特徴とする請求項1記載の駆動回路。
- 前記イベント信号は、前記論理入力信号の前記第1のエッジをトリガにして前記ハイサイド電位が変化する第1の方向への前記ハイサイド電位の変化に基づいて出力されることを特徴とする請求項1記載の駆動回路。
- 前記ハイサイド電位は、ハイサイド基準電位またはハイサイド電源電位であることを特徴とする請求項1記載の駆動回路。
- 前記ハイサイド電位検出回路は、ハイサイド回路の高耐圧領域に電界緩和を目的に形成される抵抗性フィールドプレートを備え、前記抵抗性フィールドプレートの一端を前記ハイサイド電位に接続し、他端をローサイドの基準電位に接続し、中間の分岐点を出力端子としたことを特徴とする請求項1記載の駆動回路。
- 前記ハイサイド電位検出回路は、前記ハイサイド電位がローサイドの基準電位を境に変化したときにオン状態またはオフ状態に切り換わるように構成されたバイポーラトランジスタを備えていることを特徴とする請求項1記載の駆動回路。
- 前記ハイサイド電位判定回路は、グランド電位を基準としたローサイドの基準電位側に設置されていることを特徴とする請求項1記載の駆動回路。
- 前記ハイサイド電位判定回路は、前記ハイサイド電位の絶対値に基づいて前記レベルシフト回路の誤動作を判定する第1の回路および前記ハイサイド電位のdV/dtに基づいて前記レベルシフト回路の誤動作を判定する第2の回路の少なくとも一方を備えていることを特徴とする請求項1記載の駆動回路。
- 前記第1の回路は、前記ハイサイド電位検出回路によって検出された前記ハイサイド電位に相当する電位を所定の基準電位と比較する比較器と、前記比較器の出力信号の第1のエッジに基づいて所定の時間幅の前記イベント信号を出力するエッジトリガ回路とを備えていることを特徴とする請求項8記載の駆動回路。
- 前記第1の回路は、前記ハイサイド電位検出回路によって検出された前記ハイサイド電位に相当する電位を所定の基準電位と比較する比較器と、前記比較器の出力信号の第1のエッジに基づいて所定の時間幅の第1のイベント信号を出力する第1のエッジトリガ回路と、前記比較器の出力信号を反転した信号の第1のエッジに基づいて所定の時間幅の第2のイベント信号を出力する第2のエッジトリガ回路とを備えていることを特徴とする請求項8記載の駆動回路。
- 前記第2の回路は、前記ハイサイド電位検出回路によって検出された前記ハイサイド電位に相当する電位の変化を伝達するコンデンサと、前記コンデンサを介して伝達された前記ハイサイド電位に相当する電位の変化を所定の第1の基準電位と比較する第1の比較器と、前記コンデンサを介して伝達された前記ハイサイド電位に相当する電位の変化を所定の第2の基準電位と比較する第2の比較器と、前記第1の比較器の出力と前記第2の比較器の出力とを論理演算して前記イベント信号を出力する回路と、を備えていることを特徴とする請求項8記載の駆動回路。
- 前記第2の回路は、前記ハイサイド電位検出回路によって検出された前記ハイサイド電位に相当する電位の変化を伝達するコンデンサと、前記コンデンサを介して伝達された前記ハイサイド電位に相当する電位の変化を所定の第1の基準電位と比較して第1のイベント信号を出力する第1の比較器と、前記コンデンサを介して伝達された前記ハイサイド電位に相当する電位の変化を所定の第2の基準電位と比較して第2のイベント信号を出力する第2の比較器とを備えていることを特徴とする請求項8記載の駆動回路。
- 前記パルス生成回路は、前記論理入力信号に基づく前記セット信号および前記リセット信号の生成を、前記イベント信号に基づく前記セット信号または前記リセット信号の生成に優先して実施するようにしたことを特徴とする請求項1記載の駆動回路。
- 請求項1記載の駆動回路を備えていることを特徴とする半導体装置。
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JPWO2016204122A1 (ja) * | 2015-06-16 | 2017-11-09 | 富士電機株式会社 | 半導体装置 |
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JP2019186967A (ja) * | 2016-03-17 | 2019-10-24 | 富士電機株式会社 | レベルシフト回路 |
JP7081721B2 (ja) | 2019-03-29 | 2022-06-07 | 富士電機株式会社 | 駆動回路 |
JPWO2020202898A1 (ja) * | 2019-03-29 | 2021-11-11 | 富士電機株式会社 | 駆動回路 |
US11309893B2 (en) | 2019-03-29 | 2022-04-19 | Fuji Electric Co., Ltd. | Drive circuit |
WO2020202898A1 (ja) * | 2019-03-29 | 2020-10-08 | 富士電機株式会社 | 駆動回路 |
CN112006337A (zh) * | 2019-05-31 | 2020-12-01 | 日本烟草产业株式会社 | 气溶胶吸入器用的控制装置及气溶胶吸入器 |
JP2020195295A (ja) * | 2019-05-31 | 2020-12-10 | 日本たばこ産業株式会社 | エアロゾル吸引器用の制御装置及びエアロゾル吸引器 |
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US11490661B2 (en) | 2019-05-31 | 2022-11-08 | Japan Tabacco Inc. | Control device for aerosol inhalation device and aerosol inhalation device |
CN112006337B (zh) * | 2019-05-31 | 2023-02-28 | 日本烟草产业株式会社 | 气溶胶吸入器用的控制装置及气溶胶吸入器 |
US11969023B2 (en) | 2019-05-31 | 2024-04-30 | Japan Tobacco Inc. | Control device for aerosol inhalation device and aerosol inhalation device |
JP2021166328A (ja) * | 2020-04-06 | 2021-10-14 | 三菱電機株式会社 | デバイス駆動回路 |
JP7345423B2 (ja) | 2020-04-06 | 2023-09-15 | 三菱電機株式会社 | デバイス駆動回路 |
Also Published As
Publication number | Publication date |
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CN105103447A (zh) | 2015-11-25 |
DE112014001233T5 (de) | 2016-01-07 |
JPWO2015045534A1 (ja) | 2017-03-09 |
CN105103447B (zh) | 2017-10-10 |
US9502955B2 (en) | 2016-11-22 |
US20160036315A1 (en) | 2016-02-04 |
JP6194959B2 (ja) | 2017-09-13 |
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