WO2022138540A1 - 電源制御装置 - Google Patents
電源制御装置 Download PDFInfo
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- WO2022138540A1 WO2022138540A1 PCT/JP2021/046956 JP2021046956W WO2022138540A1 WO 2022138540 A1 WO2022138540 A1 WO 2022138540A1 JP 2021046956 W JP2021046956 W JP 2021046956W WO 2022138540 A1 WO2022138540 A1 WO 2022138540A1
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- power supply
- transistor
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- reference voltage
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- 239000000758 substrate Substances 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 23
- 230000004913 activation Effects 0.000 claims description 4
- 230000003071 parasitic effect Effects 0.000 description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 239000002071 nanotube Substances 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- XHEFDIBZLJXQHF-UHFFFAOYSA-N fisetin Chemical compound C=1C(O)=CC=C(C(C=2O)=O)C=1OC=2C1=CC=C(O)C(O)=C1 XHEFDIBZLJXQHF-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- 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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
Definitions
- This disclosure relates to a power supply control device.
- Patent Document 1 Conventionally, various LED drive devices for driving LEDs (light emitting diodes) have been proposed (for example, Patent Document 1).
- the LED drive device is often provided as a semiconductor device (IC package).
- the LED drive device has a built-in circuit that generates an internal reference voltage.
- the circuit does not start when the LED drive device is started.
- One aspect of the present disclosure is a power supply control device that controls a power supply circuit that generates an output voltage based on an input power supply voltage with respect to ground, and has a first terminal to which a common voltage is applied and an application end of the ground.
- a second terminal that can be connected to, a P-type substrate to which the common voltage is applied, a MOS transistor that is connected between the first terminal and the second terminal, and is composed of an N-channel MOSFET, and the above.
- the power supply control device of the present disclosure it is possible to more reliably start the internal reference voltage generation circuit when the device is started.
- FIG. 1 is a diagram showing a configuration related to a DC / DC converter function of the LED drive device 10 according to the exemplary embodiment of the present disclosure.
- the LED drive device 10 is a semiconductor device (IC package) that drives the LED 30, and has a negative electrode type buck-boost DC / DC converter function.
- the LED drive device 10 is, for example, a device for exterior lamps (headlamps, rear lamps, turn lamps, etc.) of two wheels / four wheels.
- the reason why the negative voltage buck-boost function is adopted in the LED drive device 10 is that the input power supply voltage Vpinp is lowered due to the voltage drop of the battery or the like, and Vpinp ⁇ the forward voltage Vf of the LED30, and the LED30.
- the buck-boost configuration is used to cope with both cases where Vpinp> Vf of LED30 depending on the number of lights. Further, the buck-boost configuration has a negative electrode property so that a protection circuit when the anode of the LED 30 is short-circuited to the application end of Vpinp becomes unnecessary.
- the LED drive device 10 includes an amplifier 1, an error amplifier 2, an oscillator 3, a slope generator 4, a comparator 5, a flip-flop 6, an upper driver 7, and a lower driver 8. ,
- the diode 9, the upper transistor HM, and the lower transistor LM are integrated into one chip.
- the LED drive device 10 has a PINP terminal (input power supply terminal), a BOOT terminal (bootstrap capacity connection terminal), and a SW terminal (switching output terminal) as external terminals for establishing an electrical connection with the outside.
- a PINN terminal DC / DC negative electrode property reference input terminal
- an SNSP terminal LED current detection + connection terminal
- a SINN terminal small signal negative electrode property reference input terminal
- An inductor L, an output capacitor Cout, an LED 30, a sense resistor Rsns, and a boot capacitor Cboot are arranged outside the LED drive device 10.
- the DC / DC converter has an upper transistor HM, a lower transistor LM, an inductor L, and an output capacitor Cout, and generates an output voltage Vout based on the input voltage Vin by switching control by the LED drive device 10.
- the output voltage Vout is applied to the LED 30 as a load.
- One end of the inductor L is connected to the SW terminal.
- the other end of the inductor L is connected to the anode of the LED 30 and one end of the output capacitor Cout, and is connected to the application end of the ground GND to be grounded.
- Ground GND is the reference potential of the application.
- the cathode of the LED 30 is connected to one end of the sense resistor Rsns.
- the other end of the sense resistor Rsns and the other end of the output capacitor Cout are connected to the PINN terminal.
- the application end of the input power supply voltage Vpinp is connected to the PINP terminal.
- the input power supply voltage Vpinp is, for example, 12V with respect to the ground GND.
- Both the upper transistor HM and the lower transistor LM are composed of N-channel MOSFETs (metal-oxide-semiconductor field-effect transistors), and are connected in series between the PINP terminal and the PINN terminal to form a bridge. More specifically, the drain of the upper transistor HM is connected to the PINP terminal. The source of the upper transistor HM and the drain of the lower transistor LM are connected by a node Nsw. The source of the lower transistor LM is connected to the PINN terminal. The node Nsw is connected to the SW terminal.
- N-channel MOSFETs metal-oxide-semiconductor field-effect transistors
- one end of the sense resistor Rsns is connected to the SNSP terminal.
- the other end of the sense resistor Rsns is connected to the SINN terminal.
- amplifier 1 One input end of amplifier 1 is connected to the SNSP terminal. The other input end of amplifier 1 is connected to the SINN terminal.
- the current flowing through the LED 30 is converted by the sense resistor Rsns into a sense voltage Vsns generated between both ends of the sense resistor Rsns.
- the amplifier 1 amplifies the input sense voltage Vsns with a predetermined gain. For example, the amplifier 1 amplifies the sense voltage Vsns by multiplying it by 12.5.
- the output of amplifier 1 is input to one input end of error amplifier 2.
- a setting voltage Viset is applied to the other input end of the error amplifier 2.
- the error amplifier 2 amplifies the error of the signals input to the two input ends to generate an error signal Err.
- the LED drive device 10 has a PWM dimming function.
- PWM dimming is a method of dimming by switching the LED on and off at several hundred Hz to several kHz, and the brightness of the LED is determined by the duty in one cycle of the PWM dimming signal (“PWM” in FIG. 1). Ru.
- PWM dimming signal High level
- the error amplifier 2 performs a normal operation
- the PWM dimming signal Low level
- the normal operation of the error amplifier 2 is stopped and an output maintenance operation is performed.
- the PWM dimming signal High level
- the operation of the error amplifier 2 can be started by the output of the error amplifier 2 immediately before falling to the Low level immediately before that. Therefore, the amount of change in the LED current can be suppressed as much as possible.
- the oscillator 3 generates a clock signal CLK with a fixed frequency (for example, 400 kHz).
- the slope generation unit 4 generates the fixed frequency slope signal Slp based on the clock signal CLK.
- the slope signal Slp is generated based on the current ripple information of the current flowing through the upper transistor HM.
- the slope signal Slp is input to the non-inverting input end (+) of the comparator 5.
- An error signal Err is input to the inverting input end (-) of the comparator 5.
- the output of the comparator 5 is input to the reset terminal of the flip-flop 6.
- a clock signal CLK is input to the set terminal of the flip-flop 6.
- the upper driver 7 drives the gate of the upper transistor HM based on the Q terminal output of the flip-flop 6, and switches drives the upper transistor HM.
- the upper driver 7 applies a voltage to the gate of the upper driver 7 between the boot voltage Vbot and the switching voltage Vsw of the SW terminal.
- the boot capacitor Cboot for the bootstrap is connected between the BOOT terminal and the SW terminal.
- An application end of the internal reference voltage Vdrv5, which will be described later, is connected to the anode of the diode 9.
- a BOOT terminal is connected to the cathode of the diode 9.
- a boot voltage Vboot is generated at the BOOT terminal by charging the boot capacitor Cboot.
- the boot voltage Vboot makes it possible to turn on the upper transistor HM.
- the lower driver 8 drives the gate of the lower transistor LM based on the Q bar terminal output of the flip-flop 6, and switches drives the lower transistor LM.
- the lower driver 8 applies a voltage to the gate of the lower driver 8 between the internal reference voltage Vdrv5 and the voltage of the PINN terminal.
- the LED drive device 10 can supply a stable current to the LED 30 with respect to the input power supply voltage Vpinp and the LED load fluctuation by performing feedback control of the LED average current ILED flowing through the LED 30.
- FIG. 2 shows an example of waveforms of the inductor current IL flowing through the inductor L, the inductor average current IL_AVE, the LED average current ILED, and the switching voltage Vsw.
- the voltage drop Vdsw shown in FIG. 2 is a voltage drop due to the on-resistance of the upper transistor HM or the on-resistance of the lower transistor LM.
- the off period Doff (FIG. 2) is started.
- the exciting energy stored in the inductor L causes a current to flow through the lower transistor LM and the SW terminal in the on state (current path shown by “Doff” in FIG. 1), and the inductor current IL decreases. ..
- the output capacitor Cout is charged to the negative electrode property.
- a negative reference voltage is generated at the PINN terminal and the SINN terminal.
- the negative electrode voltage applied to the SINN terminal (first terminal) is an example of a common voltage.
- Inductor peak current control is performed by turning off the upper transistor HM so that the LED average current ILED becomes the target set current, and the inductor average current IL_AVE is controlled.
- the LED drive device 10 is a power supply control device that controls a power supply circuit that generates an output voltage Vout based on an input power supply voltage Vpinp with reference to ground GND.
- FIG. 3 is a diagram showing an internal configuration of the LED drive device 10 according to the exemplary embodiment of the present disclosure.
- FIG. 3 is a diagram showing the configuration of the internal reference voltage generation circuit 14, its peripheral circuit, and the MOS transistor M1 described later in a main part.
- the LED drive device 10 has a negative electrode voltage buck-boost DC / DC converter function, and the configuration related to this has the same configuration as that of FIG. 1.
- the LED drive device 10 has a VDCV5 terminal, a GNDIN terminal, and a heat dissipation pad (EXP_PAD) in addition to the external terminal of FIG.
- the LED drive device 10 has an internal power supply circuit 11, a bandgap reference 12, a TSD (overheat protection) circuit 13, and an internal reference voltage generation circuit 14.
- the internal power supply circuit 11 is based on the input power supply voltage Vpinp (for example, 12V based on the ground GND) input via the PINP terminal, and the internal power supply based on the negative electrode voltage Vsinn (negative reference voltage generated in the SINN terminal). Generate a voltage Vp42.
- the internal power supply voltage Vp42 is 4.2 V with respect to the negative electrode reference voltage Vsinn.
- FIG. 4 shows a configuration example of the internal power supply circuit 11.
- the internal power supply circuit 11 includes a constant current source 111, a Zener diode 112, an NaCl transistor 113, a resistor 114, and a capacitor 115.
- the anode of the Zener diode 112 is connected to the SINN terminal.
- the constant current source 111 is arranged between the PINP terminal and the cathode of the Zener diode 112.
- One end of the resistor 114 is connected to the PINP terminal.
- the other end of the resistor 114 is connected to the drain of the NaCl transistor 113.
- the gate of the MIMO transistor 113 is connected to the cathode of the Zener diode 112.
- the capacitor 115 is connected between the source of the nanotube transistor 113 and the anode of the Zener diode 112.
- the bandgap reference 12 generates a reference voltage using the internal power supply voltage Vp42 as a power source.
- the reference voltage is, for example, 1.2 V with reference to the negative reference voltage Vsinn.
- the TSD circuit 13 performs an overheat protection operation using the internal power supply voltage Vp42 as a power source.
- the internal reference voltage generation circuit 14 is configured as an LDO (Low Dropout), and generates an internal reference voltage Vdrv5 with reference to the negative reference voltage Vsinn based on the input power supply voltage Vpinp input via the PINP terminal.
- the internal reference voltage Vdrv5 is 5.0 V with respect to the negative reference voltage Vsinn.
- the internal reference voltage generation circuit 14 generates the internal reference voltage Vdrv5 based on the reference voltage generated by the bandgap reference 12.
- FIG. 5 shows a configuration example of the internal reference voltage generation circuit 14.
- the internal reference voltage generation circuit 14 includes an error amplifier 141, a polyclonal transistor 142, resistors 143 and 144, and an OCP (overcurrent protection) unit 145.
- the reference voltage Vref output from the bandgap reference 12 is applied to the inverting input end (-) of the error amplifier 141.
- the output from the OCP unit 145 is applied to one of the non-inverting input ends (+) of the error amplifier 141.
- the source of the polyclonal transistor 142 is connected to the PINP terminal.
- the gate of the polyclonal transistor 142 is connected to the output end of the error amplifier 141.
- Resistors 143 and 144 are connected in series between the drain of the polyclonal transistor 142 and the SINN terminal.
- the node N14 to which the resistors 143 and 144 are connected is connected to the other non-inverting input end (+) of the error amplifier 141.
- the node to which the drain of the polyclonal transistor 142 and the resistance 143 are connected is connected to the VDCV5 terminal (internal reference voltage terminal) (FIG. 3).
- the OCP unit 145 detects the current flowing through the source of the polyclonal transistor 142, and outputs the OCP output voltage corresponding to the detected current.
- the gate of the polyclonal transistor 142 is driven by the error amplifier 141 so that the voltage of the node N14 matches the reference voltage Vref from the band gap 12. That is, feedback control is performed by the voltage of the node N14 during normal operation. As a result, an internal reference voltage Vdrv5 of 5.0 V is generated at the VDCV5 terminal with reference to the negative reference voltage Vsinn.
- Vdrv5 an internal reference voltage generated at the VDCV5 terminal with reference to the negative reference voltage Vsinn.
- the OCP output voltage rises as the output current of the VDCV5 terminal increases and the OCP output voltage exceeds the reference voltage Vref (overcurrent state)
- feedback control is performed so that the OCP output voltage matches the reference voltage Vref. It is switched to.
- An output capacitor Cvdrv5 is connected between the VDCV5 terminal and the SINN terminal outside the LED drive device 10 (FIG. 3).
- MOS transistor M1 the configuration of the MOS transistor M1 provided in the LED drive device 10 will be described. As shown in FIG. 3, the LED drive device 10 has a MOS transistor M1.
- the MOS transistor M1 is composed of an N-channel MOSFET.
- the drain of the MOS transistor M1 is connected to the GNDIN terminal (second terminal). An application end of ground GND is connected to the GNDIN terminal.
- the source of the MOS transistor M1 is connected to the SINN terminal. As a result, the MOS transistor M1 switches between short-circuiting and breaking between the GNDIN terminal and the SINN terminal.
- the LED drive device 10 has a UVLO (Under Voltage Lock Out) unit 15, a DC / DC start state detection unit 16, and a MOS control unit 17.
- UVLO Under Voltage Lock Out
- the UVLO unit 15 When the internal reference voltage Vdrv5 is in the UVLO state (low voltage state) which is equal to or lower than the UVLO release voltage, the UVLO unit 15 outputs a high level UVLO signal Uv, while the internal reference voltage Vdrv5 exceeds the UVLO release voltage. In the UVLO release state, a Low level UVLO signal Uv is output.
- the DC / DC start-up state detection unit 16 detects whether or not the DC / DC converter is before start-up in the UVLO release state, and outputs a detection signal Det.
- the MOS control unit 17 outputs the gate signal GT1 to the gate of the MOS transistor M1 according to the levels of the UVLO signal Uv and the detection signal Det.
- the gate signal GT1 switches the MOS transistor M1 on and off.
- the MOS control unit 17 generates a gate signal GT1 that turns on the MOS transistor M1 based on the internal power supply voltage Vp42.
- the PINN terminal and the SINN terminal are connected via a heat dissipation pad and have the same potential.
- An input capacitor Cpin2 is connected between the PINP terminal and the PINN terminal.
- the starting current Is1 flows from the application end of the input power supply voltage Vpinp to the application end of the ground GND via the input capacitor Cpin2, the parasitic diode of the lower transistor LM, and the inductor L.
- the starting current Is2 flows from the application end of the input power supply voltage Vpinp to the application end of the ground GND via the input capacitor Cpin2, the SINN terminal, and the parasitic diode of the MOS transistor M1.
- the negative electrode reference voltage Vsinn becomes higher than the ground GND due to the forward voltage (Vf) at each parasitic diode of the lower transistor LM and the MOS transistor M1 (the negative electrode reference voltage Vsinn floats).
- the negative electrode reference voltage Vsinn is generated on the P-type substrate (P-Sub) included in the chip, and when the negative electrode reference voltage Vsinn is higher than the ground GND by a predetermined voltage (here, 0.3 V as an example) or more. , The parasitic NPN transistor Tr shown in FIG. 3 is turned on. At this time, as shown in FIG. 4, the internal power supply circuit 11 uses the Zener diode 112 to be a circuit that is not easily affected by the above-mentioned parasitic operation, and the negative electrode reference voltage Vsinn is GND + 0.7V.
- the internal power supply circuit 11 Since it is clamped to a certain degree, a voltage of about VPimp-0.7V as an input power supply voltage is applied between the PINP terminal and the SINN terminal, and a sufficient operating current can be secured. Therefore, the internal power supply circuit 11 does not have a start-up failure. In this way, the internal power supply circuit 11 starts the internal power supply voltage Vp42 without starting failure, and the negative electrode reference voltage Vsinn is clamped at about GND + 0.7V, so that the voltage is sufficient for the circuit operation of the bandgap reference 12. The current is secured, and the bandgap reference 12 does not have a start failure.
- the OCP unit 145 shown in FIG. 5 is in the overcurrent detection state, and there is a possibility that the internal reference voltage Vdrv5 may not be started. Unless the internal reference voltage Vdrv5 is activated in this way, the MOS transistor M1 cannot be turned on.
- the circuit current is from the line of the negative electrode reference voltage Vsinn to the MOS transistor M1 by the circuit (internal power supply circuit 11, band gap reference 12, etc.) that operates based on the negative electrode reference voltage Vsinn. It flows to the ground GND via the parasitic diode. As a result, the negative reference voltage Vsinn is maintained in a floating state. Therefore, the on state of the parasitic NPN transistor Tr is maintained, and the internal reference voltage Vdrv5 is not started.
- FIG. 6 is a timing chart showing a waveform example of the input power supply voltage Vpinp, the negative electrode reference voltage Vsinn, the internal reference voltage Vdrv5, and the state of the MOS transistor M1 when the input power supply voltage Vpinp is turned on.
- the negative electrode reference voltage Vsinn rises from the ground GND to a voltage higher than the ground GND by a predetermined voltage or more and is maintained. Since the internal reference voltage Vdrv5 is not started, it overlaps with the negative reference voltage Vsinn (that is, maintains 0 V with respect to the negative reference voltage Vsinn). The MOS transistor M1 is maintained in the off state.
- FIG. 7 is a circuit diagram showing a specific configuration example of the MOS control unit 17.
- the MOS control unit 17 includes a polyclonal transistor 171, an IGMP transistor 172, a polyclonal transistor 173, an IGMP transistor 174, an inverter 175, 176, and an inverter 177, 178.
- the source of the polyclonal transistor 171 is connected to the application end of the internal power supply voltage Vp42.
- the drain of the polyclonal transistor 171 is connected to the drain of the nanotube transistor 172.
- the source of the nanotube transistor 172 is connected to the drain of the nanotube transistor 174.
- the source of the MIMO transistor 174 is connected to the application end of the negative reference voltage Vsinn.
- the UVLO signal uv output from the UVLO unit 15 (FIG. 3) is input to the gate of the polyclonal transistor 171 and the gate of the nanotube transistor 172 via the inverter 177.
- a detection signal Det output from the DC / DC start-up state detection unit 16 is input to the gate of the polyclonal transistor 173 and the gate of the nanotube transistor 174 via the inverter 178.
- the inverters 175 and 176 are composed of a epitaxial transistor and an IGMP transistor connected in series between the application end of the internal power supply voltage Vp42 and the application end of the negative electrode reference voltage Vsinn, respectively.
- the node to which the drain of the polyclonal transistor 173 and the drain of the nanotube transistor 172 are connected is connected to the input end of the inverter 175.
- the output end of the inverter 175 is connected to the input end of the inverter 176.
- the gate signal GT1 output from the output end of the inverter 176 is input to the gate of the MOS transistor M1.
- the polyclonal transistor 171 When the UVLO signal Uv is at the high level indicating the UVLO state, the polyclonal transistor 171 is turned on, the nanotube transistor 172 is turned off, and the high level is input to the inverter 175, so that the gate signal GT1 becomes the high level and the MOS transistor. M1 is turned on.
- the UVLO signal Uv is at the Low level indicating the UVLO release state
- the polyclonal transistor 171 is in the off state
- the MIMO transistor 172 is in the on state
- the level input to the inverter 175 sets the level of the detection signal Det to the inverter 178.
- the level is obtained after the level is inverted by the inverter including the ProLiant transistor 173 and the MIMO transistor 174.
- the gate signal GT1 at a level corresponding to the level of the detection signal Det is generated. More specifically, when the level of the detection signal Det is the High level, the gate signal GT1 becomes the High level and the MOS transistor M1 is turned on. On the other hand, when the level of the detection signal Det is the Low level, the gate signal GT1 becomes the Low level and the MOS transistor M1 is turned off.
- FIG. 8 shows examples of various signal waveforms when the input power supply voltage Vpinp is turned on.
- FIG. 8 shows examples of waveforms of the input power supply voltage Vpinp, the internal power supply voltage Vp42, the internal reference voltage Vdrv5, the negative electrode property reference voltage Vsinn, and the COMP terminal voltage Vcomp.
- the COMP terminal is an external terminal (not shown in FIG. 1) to which the output of the error amplifier 2 (error signal Err) is applied, and is a phase compensation capacitance connection terminal.
- FIG. 8 also shows the operating state of the MOS transistor M1, the UVLO signal Uv, and the detection signal Det.
- the input power supply voltage Vpinp when the input power supply voltage Vpinp is turned on at the timing t0 in FIG. 8, the input power supply voltage Vpinp starts to rise. At the timing t0, the MOS transistor M1 is in the off state.
- the negative electrode reference voltage Vsinn rises due to the generation of the starting currents Is1 and Is2 described above in FIG.
- the negative electrode reference voltage Vsinn becomes higher than the ground GND by a predetermined voltage (here, 0.3 V as an example) or more, the parasitic NPN transistor Tr (FIG. 3) is turned on as described above.
- the internal reference voltage generation circuit 14 does not operate, and the internal reference voltage Vdrv5 is not started. Therefore, in FIG. 8, the internal reference voltage Vdrv5 and the negative reference voltage Vsinn overlap.
- the internal power supply circuit 11 is activated in response to the rise of the input power supply voltage Vpinp, and the internal power supply voltage Vp42 rises to a predetermined voltage (here, 4.2 V as an example) based on the negative electrode reference voltage Vsinn (timing t1). ).
- a predetermined voltage here, 4.2 V as an example
- Vsinn negative electrode reference voltage
- the internal power supply voltage Vp42 is activated regardless of the ON state of the parasitic NPN transistor Tr.
- the bandgap reference 12 is also activated regardless of the ON state of the parasitic NPN transistor Tr.
- the GNDIN terminal and the SINN terminal are short-circuited, so that the negative electrode reference voltage Vsinn drops toward the ground GND.
- the parasitic NPN transistor Tr is turned off (timing t2). After that, the negative electrode reference voltage Vsinn drops to ground GND.
- the parasitic NPN transistor Tr is turned off, the internal reference voltage generation circuit 14 starts to operate, and the internal reference voltage Vdrv5 starts to rise with reference to the negative reference voltage Vsinn. That is, the internal reference voltage Vdrv5 is activated.
- the UVLO signal Uv (FIG. 3) is set to the Low level.
- the DC / DC converter is in the state before starting, so the DC / DC starting state detecting unit 16 (FIG. 3) has a High level detection signal Det indicating that it is before starting. Is output.
- the gate signal GT1 is set to the High level, and the MOS transistor M1 is maintained in the ON state.
- the MOS transistor M1 since the MOS transistor M1 is maintained in the ON state, the negative electrode reference voltage Vsinn is maintained at the ground GND. Further, when UVLO is released, the error amplifier 2 is activated and the COMP terminal voltage Vcomp starts to rise.
- the detection signal Det becomes the Low level indicating activation
- the gate signal GT1 becomes the Low level
- the MOS transistor M1 is turned off.
- the MOS transistor M1 when the input power supply voltage Vpinp is turned on, the MOS transistor M1 is forcibly turned on by using the internal power supply voltage Vp42 generated by the internal power supply circuit 11, so that the negative electrode is used.
- the floating state of the sex reference voltage Vsinn is eliminated, and the internal reference voltage Vdrv5 can be started.
- the common voltage (voltage of the SINN terminal) is negative, but the present invention is not limited to this, and the GND (voltage of the GNDIN terminal) on the input side and the common voltage on the output side are different.
- the present disclosure is applicable in various cases.
- the power supply control device (10) is a power supply control device that controls a power supply circuit that generates an output voltage (Vout) based on an input power supply voltage (Vpinp) with reference to ground.
- An internal reference voltage generation circuit (14) that generates an internal reference voltage (Vdrv5) based on the common voltage based on the input power supply voltage.
- the MOS transistor is turned on to short-circuit the first terminal and the second terminal (first configuration).
- the input power supply circuit (11) is provided, which generates an internal power supply voltage (Vp42) based on the common voltage (Vsinn) based on the input power supply voltage (Vpinp).
- Vp42 internal power supply voltage
- Vsinn common voltage
- Vpinp input power supply voltage
- the MOS transistor may be turned on based on the internal power supply voltage to short-circuit the first terminal (SINN) and the second terminal (GNDIN).
- the internal power supply circuit (11) is A Zener diode (112) having an anode connected to the first terminal (SINN), and a constant current source (111) arranged between the application end of the input power supply voltage (Vpinp) and the cathode of the Zener diode. And an NaCl transistor (113) having a gate connected to the cathode of the Zener diode, a resistor (114) connected between the application end of the input power supply voltage and the drain of the NOTE transistor, and the NaCl transistor.
- the configuration may include a capacitor (115) connected between the source of the Zener diode and the anode of the Zener diode (third configuration).
- a UVLO unit for detecting the UVLO state / UVLO release state of the internal reference voltage (Vdrv5) and (15), and a UVLO signal representing the UVLO state output from the UVLO unit.
- a configuration may include a MOS control unit (17) for applying a high level gate signal (GT1) based on the internal power supply voltage (Vp42) to the gate of the MOS transistor (M1) based on (Uv) (Uv). Fourth configuration).
- the UVLO release state further includes a start state detection unit (16) for detecting the start state of the power supply circuit, and the start state detection unit detects the start state.
- the MOS control unit (17) may be configured to apply the gate signal (GT1) to the gate of the MOS transistor (M1) (fifth configuration).
- the bandgap reference (12) further comprises a bandgap reference (12) that generates a reference voltage (Vref) based on the internal power supply voltage (Vp42).
- the internal reference voltage generation circuit (14) is With the error amplifier (141), A polyclonal transistor (142) having a gate to which the output end of the error amplifier is connected and a source connected to the application end of the input power supply voltage (Vpinp).
- the reference voltage is applied to the first input end of the error amplifier, and the reference voltage is applied.
- the overcurrent detection signal of the OCP unit is applied to the second input end of the error amplifier.
- the node (N14) to which the resistors are connected may be configured to be connected to the third input end of the error amplifier (sixth configuration).
- the power supply control device having any one of the first to sixth configurations includes an upper transistor (HM) connected to an application end of the input power supply voltage (Vpinp) and an upper transistor (HM).
- the lower transistor (LM) connected in series with the upper transistor and
- An inductor (L) having one end connected to a node to which the upper transistor and the lower transistor are connected and the other end connected to the applied end of the ground and the anode of the LED (30).
- An output capacitor (Cout) connected between the other end of the inductor and the other end of a sense resistor (Rsns) having one end connected to the cathode of the LED.
- the first terminal (SINN) may be configured to be connectable to the other end of the sense resistor (seventh configuration).
- one aspect of the present disclosure is the power supply control device (10) having the seventh configuration, the upper transistor (HM), the lower transistor (LM), the inductor (L), and the output capacitor. It is a DC / DC converter having (Cout) and the input capacitor (Cpin2).
- This disclosure can be used, for example, to drive LEDs mounted on various devices.
Abstract
Description
図1は、本開示の例示的な実施形態に係るLED駆動装置10のDC/DCコンバータ機能に関する構成を示す図である。LED駆動装置10は、LED30を駆動する半導体装置(ICパッケージ)であり、負極性の昇降圧DC/DCコンバータ機能を有する。LED駆動装置10は、例えば、2輪/4輪の外装ランプ(ヘッドランプ、リアランプ、ターンランプなど)用の装置である。
次に、LED駆動装置に内蔵される内部基準電圧生成回路について述べる。図3は、本開示の例示的な実施形態に係るLED駆動装置10の内部構成を示す図である。図3は、内部基準電圧生成回路14およびその周辺回路および後述するMOSトランジスタM1に関する構成を要部的に示す図である。なお、LED駆動装置10は、先述したように負極性昇降圧DC/DCコンバータ機能を有しており、これに関する構成については、図1と同様の構成を有している。
次に、LED駆動装置10に備えられるMOSトランジスタM1に関する構成について述べる。図3に示すように、LED駆動装置10は、MOSトランジスタM1を有している。MOSトランジスタM1は、NチャネルMOSFETにより構成される。
このようなLED駆動装置10においては、仮にMOSトランジスタM1を内部基準電圧Vdrv5により駆動する構成である場合(比較例)、以下に説明するように、電源電圧VpinpをオンとしたLED駆動装置の起動時に、内部基準電圧生成回路14が起動しない不具合が生じることが本願発明者によって見出された。
上記のように、電源電圧Vpinpをオンとした場合に内部基準電圧Vdrv5が起動できない問題点を解決すべく、以下説明するような図3に示す構成を採用した。
なお、本明細書中に開示されている種々の技術的特徴は、上記実施形態のほか、その技術的創作の主旨を逸脱しない範囲で種々の変更を加えることが可能である。すなわち、上記実施形態は、全ての点で例示であって制限的なものではないと考えられるべきであり、本開示の技術的範囲は、上記実施形態に限定されるものではなく、特許請求の範囲と均等の意味および範囲内に属する全ての変更が含まれると理解されるべきである。
以上のように、本開示の一態様に係る電源制御装置(10)は、グランドを基準とした入力電源電圧(Vpinp)に基づき出力電圧(Vout)を生成する電源回路を制御する電源制御装置であって、
コモン電圧(Vsinn)が印加される第1端子(SINN)と、
前記グランドの印加端に接続可能な第2端子(GNDIN)と、
前記コモン電圧が印加されるP型基板と、
前記第1端子と前記第2端子との間に接続され、かつNチャネルMOSFETにより構成されるMOSトランジスタ(M1)と、
前記コモン電圧を基準とした内部基準電圧(Vdrv5)を前記入力電源電圧に基づき生成する内部基準電圧生成回路(14)と、
を有し、
前記入力電源電圧をオンとしたときに、前記MOSトランジスタをオン状態とすることにより前記第1端子と前記第2端子とを短絡させる構成としている(第1の構成)。
前記第1端子(SINN)と接続されるアノードを有するツェナーダイオード(112)と、前記入力電源電圧(Vpinp)の印加端と前記ツェナーダイオードのカソードとの間に配置される定電流源(111)と、前記ツェナーダイオードのカソードに接続されるゲートを有するNMOSトランジスタ(113)と、前記入力電源電圧の印加端と前記NMOSトランジスタのドレインとの間に接続される抵抗(114)と、前記NMOSトランジスタのソースと前記ツェナーダイオードのアノードとの間に接続されるコンデンサ(115)と、を有する構成としてもよい(第3の構成)。
前記内部基準電圧生成回路(14)は、
エラーアンプ(141)と、
前記エラーアンプの出力端が接続されるゲートと、前記入力電源電圧(Vpinp)の印加端に接続されるソースと、を有するPMOSトランジスタ(142)と、
前記PMOSトランジスタのドレインと前記第1端子(SINN)との間に直列接続される抵抗(143,144)と、
前記PMOSトランジスタのソースに流れる過電流を検出するOCP部(145)と、
を有し、
前記基準電圧は、前記エラーアンプの第1入力端に印加され、
前記OCP部の過電流検出信号は、前記エラーアンプの第2入力端に印加され、
前記抵抗同士が接続されるノード(N14)は、前記エラーアンプの第3入力端に接続される構成としてもよい(第6の構成)。
前記上側トランジスタに直列接続される下側トランジスタ(LM)と、
前記上側トランジスタと前記下側トランジスタとが接続されるノードに一端を接続され、かつ他端を前記グランドの印加端およびLED(30)のアノードに接続されるインダクタ(L)と、
前記インダクタの他端と、前記LEDのカソードに接続される一端を有するセンス抵抗(Rsns)の他端との間に接続される出力コンデンサ(Cout)と、
前記入力電源電圧の印加端と前記センス抵抗の他端との間に接続される入力コンデンサ(Cpin2)と、
を有するDC/DCコンバータに用いられ、前記センス抵抗の両端間に発生するセンス電圧(Vsns)に基づいて前記上側トランジスタおよび前記下側トランジスタをスイッチング制御するLED駆動装置であって、
前記第1端子(SINN)は、前記センス抵抗の他端に接続可能である構成としてもよい(第7の構成)。
2 エラーアンプ
3 発振器
4 スロープ生成部
5 コンパレータ
6 フリップフロップ
7 上側ドライバ
8 下側ドライバ
9 ダイオード
10 LED駆動装置
11 内部電源回路
12 バンドギャップリファレンス
13 TSD回路
14 内部基準電圧生成回路
15 UVLO部
16 DC/DC起動状態検出部
17 MOS制御部
30 LED
171 PMOSトランジスタ
172 NMOSトランジスタ
173 PMOSトランジスタ
174 NMOSトランジスタ
175、176 インバータ
177、178 インバータ
Cboot ブートコンデンサ
Cout 出力コンデンサ
Cpin2 入力コンデンサ
Cvdrv5 出力コンデンサ
HM 上側トランジスタ
L インダクタ
LM 下側トランジスタ
M1 MOSトランジスタ
Rsns センス抵抗
Tr 寄生NPNトランジスタ
Claims (8)
- グランドを基準とした入力電源電圧に基づき出力電圧を生成する電源回路を制御する電源制御装置であって、
コモン電圧が印加される第1端子と、
前記グランドの印加端に接続可能な第2端子と、
前記コモン電圧が印加されるP型基板と、
前記第1端子と前記第2端子との間に接続され、かつNチャネルMOSFETにより構成されるMOSトランジスタと、
前記コモン電圧を基準とした内部基準電圧を前記入力電源電圧に基づき生成する内部基準電圧生成回路と、
を有し、
前記入力電源電圧をオンとしたときに、前記MOSトランジスタをオン状態とすることにより前記第1端子と前記第2端子とを短絡させる、電源制御装置。 - 前記コモン電圧を基準とした内部電源電圧を前記入力電源電圧に基づき生成する内部電源回路を有し、
前記入力電源電圧をオンとしたときに、前記MOSトランジスタを前記内部電源電圧に基づいてオン状態とすることで、前記第1端子と前記第2端子とを短絡させる、請求項1に記載の電源制御装置。 - 前記内部電源回路は、
前記第1端子と接続されるアノードを有するツェナーダイオードと、
前記入力電源電圧の印加端と前記ツェナーダイオードのカソードとの間に配置される定電流源と、
前記ツェナーダイオードのカソードに接続されるゲートを有するNMOSトランジスタと、
前記入力電源電圧の印加端と前記NMOSトランジスタのドレインとの間に接続される抵抗と、
前記NMOSトランジスタのソースと前記ツェナーダイオードのアノードとの間に接続されるコンデンサと、
を有する、請求項2に記載の電源制御装置。 - 前記内部基準電圧のUVLO状態/UVLO解除状態を検出するUVLO部と、
前記UVLO部から出力される前記UVLO状態を表すUVLO信号に基づき、前記内部電源電圧に基づくHighレベルのゲート信号を前記MOSトランジスタのゲートに印加させるMOS制御部と、
を有する、請求項2または請求項3に記載の電源制御装置。 - 前記UVLO解除状態の場合に、前記電源回路の起動状態を検出する起動状態検出部をさらに有し、
前記起動状態検出部による前記起動状態の検出結果に応じて、前記MOS制御部は、前記ゲート信号を前記MOSトランジスタのゲートに印加させる、請求項4に記載の電源制御装置。 - 前記内部電源電圧に基づいて基準電圧を生成するバンドギャップリファレンスをさらに有し、
前記内部基準電圧生成回路は、
エラーアンプと、
前記エラーアンプの出力端が接続されるゲートと、前記入力電源電圧の印加端に接続されるソースと、を有するPMOSトランジスタと、
前記PMOSトランジスタのドレインと前記第1端子との間に直列接続される抵抗と、
前記PMOSトランジスタのソースに流れる過電流を検出するOCP部と、
を有し、
前記基準電圧は、前記エラーアンプの第1入力端に印加され、
前記OCP部の過電流検出信号は、前記エラーアンプの第2入力端に印加され、
前記抵抗同士が接続されるノードは、前記エラーアンプの第3入力端に接続される、請求項2から請求項5のいずれか1項に記載の電源制御装置。 - 前記入力電源電圧の印加端に接続される上側トランジスタと、
前記上側トランジスタに直列接続される下側トランジスタと、
前記上側トランジスタと前記下側トランジスタとが接続されるノードに一端を接続され、かつ他端を前記グランドの印加端およびLEDのアノードに接続されるインダクタと、 前記インダクタの他端と、前記LEDのカソードに接続される一端を有するセンス抵抗の他端との間に接続される出力コンデンサと、
前記入力電源電圧の印加端と前記センス抵抗の他端との間に接続される入力コンデンサと、
を有するDC/DCコンバータに用いられ、前記センス抵抗の両端間に発生するセンス電圧に基づいて前記上側トランジスタおよび前記下側トランジスタをスイッチング制御するLED駆動装置であって、
前記第1端子は、前記センス抵抗の他端に接続可能である、請求項1から請求項6のいずれか1項に記載の電源制御装置。 - 請求項7に記載の電源制御装置と、前記上側トランジスタと、前記下側トランジスタと、前記インダクタと、前記出力コンデンサと、前記入力コンデンサと、を有するDC/DCコンバータ。
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JP2017060383A (ja) * | 2015-09-08 | 2017-03-23 | ローム株式会社 | Dc/dcコンバータ、スイッチング電源装置 |
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JP2002287834A (ja) * | 2001-03-26 | 2002-10-04 | Citizen Watch Co Ltd | 基準電圧源回路 |
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JP2017060383A (ja) * | 2015-09-08 | 2017-03-23 | ローム株式会社 | Dc/dcコンバータ、スイッチング電源装置 |
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