WO2014024245A1 - 方向指示装置 - Google Patents
方向指示装置 Download PDFInfo
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- WO2014024245A1 WO2014024245A1 PCT/JP2012/069991 JP2012069991W WO2014024245A1 WO 2014024245 A1 WO2014024245 A1 WO 2014024245A1 JP 2012069991 W JP2012069991 W JP 2012069991W WO 2014024245 A1 WO2014024245 A1 WO 2014024245A1
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- indicator
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- indicator lamp
- voltage
- lit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
- B60Q11/007—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not the lighting devices indicating change of drive direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/34—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction
- B60Q1/38—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction using immovably-mounted light sources, e.g. fixed flashing lamps
Definitions
- the present invention relates to a direction indicating device using an LED element as a direction indicating lamp.
- direction indicating device for an automobile or a motorcycle, for example, the one shown in FIG. 4 is known.
- light bulbs bulbs
- direction indication lights winkers
- the direction indicating device also includes indicators 105L and 105R provided in the instrument panel.
- the drive current flows through the two light bulbs 102LF and 102LR and the indicator 105L of the direction indicating lamp 102L.
- the direction indicator lamp 102L and the indicator 105L blink at the cycle of the oscillation pulse signal supplied to the gate of the N-type MOS transistor NM101.
- the drive current decreases.
- the comparator COMP101 that has detected the decrease in the drive current controls the oscillator 104a to change the period of the oscillation pulse signal to about 1 ⁇ 2.
- the blinking speed of the direction indicator lamp 102L and the indicator 105L is approximately doubled, so that the driver can be notified of the disconnection of the light bulbs 102LF and 102LR.
- the light bulbs 102LF, 102LR, 102RF, and 102RR for the direction indicator lamps for example, those of 10 to 27 W are used.
- the power supply voltage is 13.5 V
- a current of about 0.74 A flows in a 10 W bulb
- a current of about 2.2 A flows in a 27 W bulb.
- the indicators 105L and 105R for example, a 1.2 to 3.4 W light bulb or a 0.02 to 0.1 A LED element is used.
- the power supply voltage is 13.5 V
- a current of about 0.09 A flows through a 1.2 W light bulb
- a current of about 0.24 A flows through a 3.4 W light bulb.
- the voltage V101 supplied to the comparator COMP101 is set so that the disconnection is not detected when the indicators 105L and 105R are disconnected, and is detected only when the direction indicator lights 102L and 102R are disconnected. Yes.
- a direction indicating device described in JP1-90831A is also known as a device similar to this direction indicating device.
- the current flowing through the LED element for the direction indicator lamp is, for example, about 0.1 to 0.3 A. Compared to the case where a light bulb is used, the current flowing through the indicator light bulb and the indicator LED element The difference is small.
- the present invention has an object to provide a direction indicating device that can reliably detect a disconnection of a direction indicator lamp using an LED element without detecting disconnection of an indicator.
- a direction indicating device includes: A pulse signal generator for generating a pulse signal; A first switching element having one end to which a power supply voltage is supplied, a control terminal to which the pulse signal is supplied, and another end that outputs a drive current having a magnitude corresponding to the amplitude of the pulse signal; A first terminal, a second terminal, and a third terminal; electrically connecting the first terminal and the second terminal; and electrically connecting the first terminal and the third terminal. It is possible to switch between a connection state and a state in which the first terminal, the second terminal, and the third terminal are electrically opened, and the first terminal is connected to the other end of the first switching element.
- a connected direction indicator switch A first direction indicator lamp including a first LED element, one end connected to the second terminal, the other end connected to ground, and lit when a current flows;
- a second direction indicator lamp including a second LED element, one end connected to the third terminal, the other end connected to ground, and lit when a current flows;
- a disconnection detection unit that causes the pulse signal generation unit to change the period of the pulse signal;
- a lighting state detector that detects lighting states of the first direction indicator lamp and the second direction indicator lamp;
- An indicator portion having one or more indicators that illuminate when current flows; The one indicator is driven to turn on according to the lighting state detected by the lighting state detection unit, or at least one of the plurality of indicators is driven to turn on according to the lighting state.
- an indicator driving unit When the drive current corresponding to the pulse wave of the pulse signal is equal to or less than a predetermined disconnection detection value, a disconnection detection unit that causes the pulse signal generation unit to change the period of the pulse signal;
- a lighting state detector that detects lighting states of the first
- the indicator unit includes a first indicator and a second indicator
- the indicator driving unit drives and lights the first indicator during a first lighting period in which the first direction indicator lamp is lit, while the first direction indicator lamp is not lit.
- the first indicator is not driven and not lit during the first extinguishing period, and the second indicator is driven and lit during the second lighting period when the second direction indicator lamp is lit.
- the second indicator does not need to be driven and turned on during the second turn-off period when the second direction indicator lamp is not turned on.
- the lighting state detection unit detects that the first direction indicator lamp is lit when the voltage at one end of the first direction indicator lamp is equal to or higher than a predetermined first threshold voltage. On the other hand, when the voltage at one end of the first direction indicator lamp is less than the first threshold voltage, it is detected that the first direction indicator lamp is not lit, and When the voltage at one end of the second direction indicator lamp is equal to or higher than a predetermined second threshold voltage, it is detected that the second direction indicator lamp is lit, while the second direction When the voltage at one end of the indicator lamp is less than the second threshold voltage, it may be detected that the second direction indicator lamp is not lit.
- the indicator driver is One end to which the power supply voltage is supplied, and the other end that outputs the first indicator driving current during the first lighting period and does not output the first indicator driving current during the first extinguishing period.
- a second switching element One end to which the power supply voltage is supplied, and the other end that outputs the second indicator driving current during the second lighting period and does not output the second indicator driving current during the second lighting period.
- a third switching element The first indicator has one end connected to the other end of the second switching element and the other end connected to ground.
- the second indicator may have one end connected to the other end of the third switching element and the other end connected to ground.
- the second switching element includes a first P-type MOS transistor having a source to which the power supply voltage is supplied and a drain connected to one end of the first indicator.
- the third switching element includes a second P-type MOS transistor having a source to which the power supply voltage is supplied and a drain connected to one end of the second indicator.
- the lighting state detection unit A first resistor in which the power supply voltage is supplied to one end and the other end is connected to the gate of the first P-type MOS transistor; A second resistor having the other end connected to the gate of the second P-type MOS transistor;
- the first direction has one end connected to the other end of the first resistor, a control terminal connected to one end of the first direction indicator lamp, and the other end connected to ground.
- the second direction has one end connected to the other end of the second resistor, a control terminal connected to one end of the second direction indicator lamp, and the other end connected to ground.
- a second switching element that is turned on when a voltage at one end of the indicator lamp is equal to or higher than the second threshold voltage.
- the indicator unit has the one indicator,
- the indicator driving unit drives and lights the one indicator during a lighting period in which either the first direction indicator lamp or the second direction indicator lamp is lit, while the first direction
- the one indicator does not need to be driven and turned on during the extinguishing period when both the indicator lamp and the second direction indicator lamp are not lit.
- the lighting state detection unit is either the first direction indication lamp or the second direction indication lamp. Is detected, and when the voltage at the first terminal of the direction indicator switch is less than the threshold voltage, the first direction indicator lamp and the second direction indicator lamp It may be detected that both are not lit.
- the indicator driving unit includes a second switching element having one end to which the power supply voltage is supplied and the other end that outputs an indicator driving current during the lighting period and does not output the indicator driving current during the extinguishing period.
- the one indicator may have one end connected to the other end of the second switching element and the other end connected to the ground.
- the second switching element includes a P-type MOS transistor having a source to which the power supply voltage is supplied and a drain connected to one end of the one indicator.
- the lighting state detection unit A resistor having the other end connected to the gate of the P-type MOS transistor; One end connected to the other end of the resistor, a control terminal connected to the first terminal of the direction indicating switch, and the other end connected to the ground, the first of the direction indicating switch And a switching element that is turned on when the terminal voltage is equal to or higher than the threshold voltage.
- one of the indicator units is provided according to the lighting state of the first and second direction indicator lamps. Since the indicator driving unit that drives and lights the indicator, or drives and lights at least one of the plurality of indicators of the indicator unit according to the lighting state, the path of the current flowing through the indicator unit is provided. Is different from the path of the drive current flowing through the first or second direction indicator lamp. As a result, when the indicator is disconnected, the drive current is not affected by the decrease in the current flowing through the indicator unit, so that the disconnection detection by the disconnection detection unit can be prevented. Therefore, it is possible to reliably detect the disconnection of the direction indicator lamp using the LED element without detecting the disconnection of the indicator.
- FIG. 1 is a circuit diagram of a direction indication device according to Embodiment 1.
- FIG. FIG. 3 is a circuit diagram of the direction indication device according to the first embodiment, and is a diagram illustrating an example of a circuit configuration of a lighting state detection unit.
- 6 is a circuit diagram of a direction indicating device according to Embodiment 2.
- FIG. It is a circuit diagram of the conventional direction indicator.
- FIG. 1 is a circuit diagram of a direction indicating device according to Embodiment 1 of the present invention.
- the direction indication device includes a bootstrap circuit 1, a direction indication switch SW, a first direction indication lamp 2L, a second direction indication lamp 2R, an internal power supply 3, and a pulse signal generation.
- Unit 4 an N-type MOS transistor (first switching element) NM1, a current detection resistor R1, a disconnection detection unit 5, a lighting state detection unit 6, an indicator unit 7, and an indicator drive unit 8.
- This direction indicating device is used for a motorcycle, for example.
- the bootstrap circuit 1, the internal power supply 3, the pulse signal generation unit 4, the N-type MOS transistor NM1, the current detection resistor R1, the disconnection detection unit 5, the lighting state detection unit 6, and the indicator drive unit 8 The winker relay (direction indicator light control device) 10 is configured.
- the bootstrap circuit 1 includes a diode (rectifier element) D1, a capacitive element C1, and a Zener diode ZD1.
- the diode D1 the power supply voltage VDD from the power supply (battery) B is applied to the anode (one end).
- One end of the capacitive element C1 is connected to the cathode (the other end) of the diode D1, and the other end is connected to the first terminal of the direction indicating switch SW.
- the Zener diode ZD1 has a cathode connected to one end of the capacitive element C1, and an anode connected to the other end of the capacitive element C1.
- the direction indicating switch SW has a first terminal, a second terminal (L terminal), and a third terminal (R terminal).
- the direction indicating switch SW includes a state in which the first terminal and the second terminal are electrically connected, a state in which the first terminal and the third terminal are electrically connected, a first terminal and a second terminal, The state of electrically opening between the third terminals can be switched.
- the first direction indicator lamp 2L for the left side is lit when one end (anode side) is connected to the second terminal of the direction indication switch SW and the other end (cathode side) is connected to the ground, and a current flows.
- the second direction indicator lamp 2R for the right side is turned on when one end (anode side) is connected to the third terminal of the direction indication switch SW and the other end (cathode side) is connected to the ground, and a current flows.
- the first direction indicator lamp 2L has a left front direction indicator lamp 2LF and a left rear direction indicator lamp 2LR connected in parallel.
- Each of the left front direction indicator lamp 2LF and the left rear direction indicator lamp 2LR includes three first LED elements and a current limiting resistor connected in series.
- 2nd direction indicator lamp 2R has right front direction indicator lamp 2RF and right rear direction indicator lamp 2RR connected in parallel.
- the right front direction indicator lamp 2RF and the right rear direction indicator lamp 2RR each include three second LED elements and a current limiting resistor connected in series.
- the power source B supplies the diode D1, the capacitive element C1, the direction indicating switch SW, and the first direction indicating lamp.
- a current flows to the ground GND via 2L or the second direction indicator lamp 2R.
- the capacitive element C1 is charged, and the bootstrap circuit 1 generates an internal power supply voltage Vcc that is a voltage at one end of the capacitive element C1, based on the reference voltage VS that is a voltage at the other end of the capacitive element C1.
- the internal power supply 3 is activated using the potential difference between the internal power supply voltage Vcc and the reference voltage VS as a power supply, and generates a bias voltage based on the reference voltage VS. Although not shown, the generated bias voltage is supplied to a predetermined circuit in the blinker relay 10. This bias voltage is a voltage for determining the operating point of the circuit, and is a voltage supplied to a necessary circuit separately from the internal power supply voltage Vcc.
- the pulse signal generation unit 4 is activated using the potential difference between the internal power supply voltage Vcc and the reference voltage VS as a power supply, and generates a pulse signal P having a predetermined frequency (for example, 1.42 Hz).
- a pulse signal P is a rectangular wave, and the duty ratio of the pulse signal P is around 50%.
- the pulse signal generation unit 4 includes an oscillator 4a and a pulse signal generation circuit 4b.
- the oscillator 4a generates an oscillation signal.
- the pulse signal generation circuit 4b amplifies and divides the oscillation signal from the oscillator 4a to generate the pulse signal P.
- the pulse signal P can take an amplitude from the reference voltage VS to the internal power supply voltage Vcc.
- the N-type MOS transistor NM1 outputs a drain (one end) to which the power supply voltage VDD is supplied, a gate (control terminal) to which the pulse signal P is supplied, and a drive current I having a magnitude corresponding to the amplitude of the pulse signal P.
- a source (the other end).
- the current detection resistor R1 is connected between the source of the N-type MOS transistor NM1 and the first terminal of the direction indicating switch SW. That is, the source of the N-type MOS transistor NM1 is connected to the first terminal of the direction indicating switch SW via the current detection resistor R1.
- the drive current I having a magnitude corresponding to the amplitude of the pulse signal P flows to the first direction indicator lamp 2L or the second direction indicator lamp 2R via the direction indicator switch SW. Thereby, the first direction indicator lamp 2L or the second direction indicator lamp 2R blinks at the frequency of the pulse signal P.
- the disconnection detection unit 5 When the drive current I corresponding to the pulse wave of the pulse signal P becomes equal to or less than a predetermined disconnection detection value, that is, when a disconnection is detected, the disconnection detection unit 5 sends the pulse signal P to the pulse signal generation unit 4.
- the period (ie, frequency) is changed.
- the disconnection detection value is that either the left front direction indicator lamp 2LF or the left rear direction indicator lamp 2LR is disconnected, or that either the right front direction indicator lamp 2RF or the right rear direction indicator lamp 2RR is disconnected. Should be set to such a value that can be detected.
- the pulse signal generation unit 4 may increase or decrease the frequency of the pulse signal P to, for example, double 2.84 Hz. Specifically, the frequency of the pulse signal P is changed by the pulse signal generation circuit 4b of the pulse signal generation unit 4 changing the frequency division ratio.
- the pulse signal generation circuit 4b of the pulse signal generation unit 4 changing the frequency division ratio.
- the disconnection detection unit 5 determines whether the drive current I corresponding to the pulse wave of the pulse signal P is equal to or lower than the disconnection detection value based on the voltage between both ends of the current detection resistor R1, for example, using a comparator. .
- the lighting state detector 6 detects the lighting state of the first direction indicator lamp 2L and the second direction indicator lamp 2R. Specifically, the lighting state detection unit 6 turns on the first direction indicator lamp 2L when the voltage at one end of the first direction indicator lamp 2L is equal to or higher than a predetermined first threshold voltage. On the other hand, when the voltage at one end of the first direction indicator lamp 2L is lower than the first threshold voltage, it is detected that the first direction indicator lamp 2L is not lit.
- the lighting state detector 6 further indicates that the second direction indicator lamp 2R is lit when the voltage at one end of the second direction indicator lamp 2R is equal to or higher than a predetermined second threshold voltage. On the other hand, when the voltage at one end of the second direction indicator lamp 2R is less than the second threshold voltage, it is detected that the second direction indicator lamp 2R is not lit.
- the first threshold voltage and the second threshold voltage may be equal.
- the indicator unit 7 includes a first indicator 7L for the left side and a second indicator 7R for the right side.
- the first indicator 7L and the second indicator 7R can be provided in the instrument panel of the motorcycle.
- the first indicator 7L and the second indicator 7R each include an LED element and a current limiting resistor connected in series, and light up when a current flows.
- the indicator driving unit 8 drives and lights at least one of the first indicator 7L and the second indicator 7R according to the lighting state detected by the lighting state detection unit 6.
- the indicator driving unit 8 drives and lights the first indicator 7L during the first lighting period in which the first direction indicator lamp 2L is lit under the control of the lighting state detection unit 6.
- the first indicator 7L is not driven and is not turned on during the first turn-off period when the first direction indicator lamp 2L is not turned on.
- the indicator driving unit 8 further drives and lights the second indicator 7R during the second lighting period in which the second direction indicator lamp 2R is lit under the control of the lighting state detection unit 6, while The second indicator 7R is not driven and is not lit during the second turn-off period when the second direction indicator lamp 2R is not lit.
- the indicator driving unit 8 includes a first P-type MOS transistor (second switching element) PM1 and a second P-type MOS transistor (third switching element) PM2.
- the first P-type MOS transistor PM1 outputs a first indicator driving current during a first lighting period and a first indicator driving during a first lighting period, and a source (one end) to which the power supply voltage VDD is supplied. And a drain (other end) that does not output current.
- the second P-type MOS transistor PM2 outputs a second indicator driving current during the second lighting period and a second indicator driving during the second lighting period, and a source (one end) to which the power supply voltage VDD is supplied. And a drain (other end) that does not output current.
- the first indicator 7L has one end (anode side) connected to the drain of the first P-type MOS transistor PM1, and the other end (cathode side) connected to the ground GND. That is, the first indicator driving current can flow to the first indicator 7L.
- the second indicator 7R has one end (anode side) connected to the drain of the second P-type MOS transistor PM2, and the other end (cathode side) connected to the ground GND. That is, the second indicator driving current can flow to the second indicator 7R.
- the lighting state detection unit 6 may have any circuit configuration as long as it has the above-described function, but an example of the circuit configuration will be described below with reference to FIG.
- FIG. 2 is a circuit diagram of the direction indicating device according to the first embodiment, and is a diagram illustrating an example of a circuit configuration of the lighting state detection unit 6. Except for the circuit configuration of the lighting state detection unit 6, the configuration is the same as in FIG.
- the lighting state detection unit 6 includes a first resistor R2, a second resistor R3, resistors R4 to R7, an NPN transistor (fourth switching element) Q1, and an NPN transistor. (Fifth switching element) Q2.
- the power supply voltage VDD is supplied to one end of the first resistor R2, and the other end is connected to the gate of the first P-type MOS transistor PM1.
- the power supply voltage VDD is supplied to one end of the second resistor R3, and the other end is connected to the gate of the second P-type MOS transistor PM2.
- the NPN transistor Q1 has a collector (one end) connected to the other end of the first resistor R2 via a resistor R4 and a base (control) connected to one end of the first direction indicator lamp 2L via a resistor R5. Terminal) and an emitter (the other end) connected to the ground GND.
- the NPN transistor Q1 is turned on when the voltage at one end of the first direction indicator lamp 2L is equal to or higher than the first threshold voltage, and is turned off when the voltage is lower than the first threshold voltage.
- the NPN transistor Q2 includes a collector (one end) connected to the other end of the second resistor R3 via a resistor R6, and a base (control) connected to one end of the second direction indicator lamp 2R via a resistor R7. Terminal) and an emitter (the other end) connected to the ground GND.
- the NPN transistor Q2 is turned on when the voltage at one end of the second direction indicator lamp 2R is equal to or higher than the second threshold voltage, and turned off when the voltage is lower than the second threshold voltage.
- the NPN transistor Q1 is turned on. Thereby, since a current flows through the first resistor R2, the first P-type MOS transistor PM1 is turned on and outputs a first indicator driving current. Accordingly, the first indicator 7L is lit.
- the NPN transistor Q1 Turn off. Thereby, since no current flows through the first resistor R2, the first P-type MOS transistor PM1 is turned off and does not output the first indicator driving current. Accordingly, the first indicator 7L is turned off.
- the first indicator 7L blinks in synchronization with the blinking of the first direction indicator lamp 2L.
- the second indicator 7R blinks in synchronization with the blinking of the second direction indicator lamp 2R.
- the disconnection detection unit 5 does not detect disconnection at this time, and the first and second direction indicating lamps 2L and 2R can continue the normal blinking operation.
- the first and second transistors are separated from the N-type MOS transistor NM1 that outputs the drive current I to the first direction indicator lamp 2L or the second direction indicator lamp 2R.
- an indicator driving unit 8 is provided for driving and lighting at least one of the two first and second indicators 7L, 7R of the indicator unit 7. . Therefore, the path of the current flowing through the indicator unit 7 is different from the path of the drive current I flowing through the first direction indicator lamp 2L or the second direction indicator lamp 2R.
- the drive current I is not affected by the decrease in the current flowing through the indicator unit 7, so that the disconnection detection by the disconnection detection unit 5 can be prevented. .
- the disconnection of the first and second turn indicators 2L and 2R can be reliably detected without detecting the disconnection of the first and second indicators 7L and 7R.
- Example 2 differs from Example 1 in that it has one indicator.
- FIG. 3 is a circuit diagram of the direction indicating device according to the second embodiment. As shown in FIG. 3, this direction indicating device is different from the lighting state detection unit 6, the indicator unit 7 and the indicator driving unit 8 of the first embodiment in the configuration of the lighting state detection unit 6a, the indicator unit 7a and the indicator driving unit 8a. .
- the other circuit configuration is the same as that of the first embodiment shown in FIGS.
- the lighting state detecting unit 6a and the second direction indicating lamp 2L It is detected that any of the lamps 2R is lit.
- the lighting state detecting unit 6a indicates that both the first direction indicating lamp 2L and the second direction indicating lamp 2R are not lit. Is detected.
- the lighting state detection unit 6a includes resistors R2, R4, R5 and an NPN transistor (third switching element) Q1.
- the resistor R2 is supplied with the power supply voltage VDD at one end, and the other end is connected to the gate of the P-type MOS transistor PM1.
- the NPN transistor Q1 includes a collector (one end) connected to the other end of the resistor R2 via the resistor R4, a base (control terminal) connected to the first terminal of the direction indicating switch SW via the resistor R5, And an emitter (the other end) connected to the ground GND.
- the NPN transistor Q1 is turned on when the voltage at the first terminal of the direction indicating switch SW is equal to or higher than the threshold voltage, and turned off when the voltage is lower than the threshold voltage.
- the indicator unit 7a has one indicator 7A that lights up when a current flows.
- the indicator 7A can be provided in the instrument panel of the motorcycle.
- Indicator 7A includes an LED element and a current limiting resistor connected in series.
- the indicator driving unit 8a drives the indicator 7A to light up according to the lighting state detected by the lighting state detection unit 6a.
- the indicator driving unit 8a drives and lights the indicator 7A during the lighting period in which one of the first direction indicator lamp 2L and the second direction indicator lamp 2R is lit,
- the indicator 7A is not driven and is not lit during the extinguishing period when both the direction indicator lamp 2L and the second direction lamp 2R are not lit.
- the indicator driver 8a includes a P-type MOS transistor (second switching element) PM1.
- the P-type MOS transistor PM1 has a source (one end) to which the power supply voltage VDD is supplied, and a drain (the other end) that outputs the indicator driving current during the lighting period and does not output the indicator driving current during the extinguishing period.
- the indicator 7A has one end (anode side) connected to the drain of the P-type MOS transistor PM1, and the other end (cathode side) connected to the ground GND. That is, the indicator driving current can flow through the indicator 7A.
- the reference voltage VS becomes equal to or higher than the threshold voltage during the lighting period in which the direction indicating switch SW is turned on to the second terminal side and the first direction indicating lamp 2L is lit.
- the NPN transistor Q1 is turned on.
- the P-type MOS transistor PM1 is turned on and outputs an indicator driving current. Accordingly, the indicator 7A is lit.
- the P-type MOS transistor PM1 is turned on and outputs the indicator driving current. Accordingly, the indicator 7A is lit.
- the NPN transistor Q1 is turned off. Thereby, since no current flows through the first resistor R2, the P-type MOS transistor PM1 is turned off and does not output the indicator driving current. Accordingly, the indicator 7A is turned off.
- the indicator 7A blinks in synchronization with the blinking of the first direction indicator lamp 2L, and blinks in synchronization with the blinking of the second direction indicator lamp 2R.
- the disconnection detection unit 5 does not detect disconnection at this time, and the first and second direction indicating lamps 2L and 2R can continue the normal blinking operation.
- the first and second transistors are separated from the N-type MOS transistor NM1 that outputs the drive current I to the first direction indicator lamp 2L or the second direction indicator lamp 2R.
- an indicator driving unit 8a that drives and lights the indicator 7A of the indicator unit 7a is provided. Therefore, the path of the current flowing through the indicator unit 7a is different from the path of the drive current I. Thereby, when the indicator 7A is disconnected, the drive current I is not affected by the decrease in the current flowing through the indicator unit 7a, so that the disconnection detection by the disconnection detector 5 can be prevented. That is, the same effect as in the first embodiment can be obtained.
- a P-type MOS transistor may be used instead of the N-type MOS transistor NM1.
- the bootstrap circuit 1 need not be provided.
- first and second indicators 7L and 7R and the indicator 7A may be composed of light bulbs.
- the number of LED elements included in each of the left front direction indicator lamp 2LF, the left rear direction indicator lamp 2LR, the right front direction indicator lamp 2RF, and the right rear direction indicator lamp 2RR is not limited to three.
- the number of LED elements included in each of the first and second indicators 7L and 7R and the indicator 7A is not limited to one.
- the direction indicating device may include a hazard switch.
- the hazard switch is in an on state in which the first terminal, the second terminal, and the third terminal of the direction indicating switch SW are electrically connected, and between the first terminal, the second terminal, and the third terminal. It is possible to switch between the off state and the off state.
- the first and second direction indicating lights 2L and 2R blink simultaneously.
- the first and second indicators 7L and 7R blink simultaneously with the blinking of the first and second direction indicators 2L and 2R.
- the indicator 7A blinks in synchronization with the blinking of the first and second direction indicating lights 2L and 2R.
Abstract
Description
パルス信号を生成するパルス信号生成部と、
電源電圧が供給される一端と、前記パルス信号が供給される制御端子と、前記パルス信号の振幅に応じた大きさの駆動電流を出力する他端と、を有する第1のスイッチング素子と、
第1端子、第2端子および第3端子を有し、前記第1端子と前記第2端子の間を電気的に接続する状態と、前記第1端子と前記第3端子の間を電気的に接続する状態と、前記第1端子と前記第2端子と前記第3端子の間を電気的に開放する状態とを切り替え可能であり、前記第1のスイッチング素子の他端に前記第1端子が接続された方向指示スイッチと、
第1のLED素子を含み、前記第2端子に一端が接続され、接地に他端が接続され、電流が流れると点灯する第1の方向指示灯と、
第2のLED素子を含み、前記第3端子に一端が接続され、接地に他端が接続され、電流が流れると点灯する第2の方向指示灯と、
前記パルス信号のパルス波に対応した前記駆動電流が予め定められた断線検出値以下になった場合に、前記パルス信号生成部に前記パルス信号の周期を変更させる断線検出部と、
前記第1の方向指示灯と前記第2の方向指示灯の点灯状態を検出する点灯状態検出部と、
電流が流れると点灯する1つ又は複数のインジケータを有するインジケータ部と、
前記点灯状態検出部で検出された前記点灯状態に応じて前記1つのインジケータを駆動して点灯させ、又は、前記点灯状態に応じて前記複数のインジケータのうちの少なくとも何れかを駆動して点灯させるインジケータ駆動部と、を備える
ことを特徴とする。
前記インジケータ部は、第1のインジケータと、第2のインジケータと、を有し、
前記インジケータ駆動部は、前記第1の方向指示灯が点灯している第1の点灯期間に前記第1のインジケータを駆動して点灯させ、一方、前記第1の方向指示灯が点灯していない第1の消灯期間に前記第1のインジケータを駆動せず点灯させず、さらに、前記第2の方向指示灯が点灯している第2の点灯期間に前記第2のインジケータを駆動して点灯させ、一方、前記第2の方向指示灯が点灯していない第2の消灯期間に前記第2のインジケータを駆動せず点灯させなくてもよい。
前記点灯状態検出部は、前記第1の方向指示灯の一端の電圧が予め定められた第1のしきい値電圧以上である場合、前記第1の方向指示灯が点灯していることを検出し、一方、前記第1の方向指示灯の一端の電圧が前記第1のしきい値電圧未満である場合、前記第1の方向指示灯が点灯していないことを検出し、さらに、前記第2の方向指示灯の一端の電圧が予め定められた第2のしきい値電圧以上である場合、前記第2の方向指示灯が点灯していることを検出し、一方、前記第2の方向指示灯の一端の電圧が前記第2のしきい値電圧未満である場合、前記第2の方向指示灯が点灯していないことを検出してもよい。
前記インジケータ駆動部は、
前記電源電圧が供給される一端と、前記第1の点灯期間に第1のインジケータ駆動電流を出力し、前記第1の消灯期間に前記第1のインジケータ駆動電流を出力しない他端と、を有する第2のスイッチング素子と、
前記電源電圧が供給される一端と、前記第2の点灯期間に第2のインジケータ駆動電流を出力し、前記第2の消灯期間に前記第2のインジケータ駆動電流を出力しない他端と、を有する第3のスイッチング素子と、を有し、
前記第1のインジケータは、前記第2のスイッチング素子の他端に一端が接続され、接地に他端が接続され、
前記第2のインジケータは、前記第3のスイッチング素子の他端に一端が接続され、接地に他端が接続されていてもよい。
前記第2のスイッチング素子は、前記電源電圧が供給されるソースと、前記第1のインジケータの一端に接続されたドレインと、を有する第1のP型MOSトランジスタで構成され、
前記第3のスイッチング素子は、前記電源電圧が供給されるソースと、前記第2のインジケータの一端に接続されたドレインと、を有する第2のP型MOSトランジスタで構成され、
前記点灯状態検出部は、
前記電源電圧が一端に供給され、前記第1のP型MOSトランジスタのゲートに他端が接続された第1の抵抗と、
前記電源電圧が一端に供給され、前記第2のP型MOSトランジスタのゲートに他端が接続された第2の抵抗と、
前記第1の抵抗の他端に接続された一端と、前記第1の方向指示灯の一端に接続された制御端子と、接地に接続された他端と、を有し、前記第1の方向指示灯の一端の電圧が前記第1のしきい値電圧以上の時にオンする第1のスイッチング素子と、
前記第2の抵抗の他端に接続された一端と、前記第2の方向指示灯の一端に接続された制御端子と、接地に接続された他端と、を有し、前記第2の方向指示灯の一端の電圧が前記第2のしきい値電圧以上の時にオンする第2のスイッチング素子と、を有してもよい。
前記インジケータ部は、前記1つのインジケータを有し、
前記インジケータ駆動部は、前記第1の方向指示灯と前記第2の方向指示灯の何れかが点灯している点灯期間に前記1つのインジケータを駆動して点灯させ、一方、前記第1の方向指示灯と前記第2の方向指示灯の両方が点灯していない消灯期間に前記1つのインジケータを駆動せず点灯させなくてもよい。
前記点灯状態検出部は、前記方向指示スイッチの前記第1端子の電圧が予め定められたしきい値電圧以上である場合、前記第1の方向指示灯と前記第2の方向指示灯の何れかが点灯していることを検出し、一方、前記方向指示スイッチの前記第1端子の電圧が前記しきい値電圧未満である場合、前記第1の方向指示灯と前記第2の方向指示灯の両方が点灯していないことを検出してもよい。
前記インジケータ駆動部は、前記電源電圧が供給される一端と、前記点灯期間にインジケータ駆動電流を出力し、前記消灯期間に前記インジケータ駆動電流を出力しない他端と、を有する第2のスイッチング素子を有し、
前記1つのインジケータは、前記第2のスイッチング素子の他端に一端が接続され、接地に他端が接続されていてもよい。
前記第2のスイッチング素子は、前記電源電圧が供給されるソースと、前記1つのインジケータの一端に接続されたドレインと、を有するP型MOSトランジスタで構成され、
前記点灯状態検出部は、
前記電源電圧が一端に供給され、前記P型MOSトランジスタのゲートに他端が接続された抵抗と、
前記抵抗の他端に接続された一端と、前記方向指示スイッチの前記第1端子に接続された制御端子と、接地に接続された他端と、を有し、前記方向指示スイッチの前記第1端子の電圧が前記しきい値電圧以上の時にオンするスイッチング素子と、を有してもよい。
SW 方向指示スイッチ
2L 第1の方向指示灯
2R 第2の方向指示灯
3 内部電源
4 パルス信号生成部
4a 発振器
4b パルス信号生成回路
5 断線検出部
6,6a 点灯状態検出部
7,7a インジケータ部
7L 第1のインジケータ
7R 第2のインジケータ
7A インジケータ
8,8a インジケータ駆動部
R1 電流検出抵抗
R2 第1の抵抗
R3 第2の抵抗
R4~R7 抵抗
D1 ダイオード
C1 容量素子
NM1 N型MOSトランジスタ(第1のスイッチング素子)
PM1 第1のP型MOSトランジスタ(第2のスイッチング素子)
PM2 第2のP型MOSトランジスタ(第3のスイッチング素子)
Q1 NPN型トランジスタ(第3又は第4のスイッチング素子)
Q2 NPN型トランジスタ(第5のスイッチング素子)
Claims (9)
- パルス信号を生成するパルス信号生成部と、
電源電圧が供給される一端と、前記パルス信号が供給される制御端子と、前記パルス信号の振幅に応じた大きさの駆動電流を出力する他端と、を有する第1のスイッチング素子と、
第1端子、第2端子および第3端子を有し、前記第1端子と前記第2端子の間を電気的に接続する状態と、前記第1端子と前記第3端子の間を電気的に接続する状態と、前記第1端子と前記第2端子と前記第3端子の間を電気的に開放する状態とを切り替え可能であり、前記第1のスイッチング素子の他端に前記第1端子が接続された方向指示スイッチと、
第1のLED素子を含み、前記第2端子に一端が接続され、接地に他端が接続され、電流が流れると点灯する第1の方向指示灯と、
第2のLED素子を含み、前記第3端子に一端が接続され、接地に他端が接続され、電流が流れると点灯する第2の方向指示灯と、
前記パルス信号のパルス波に対応した前記駆動電流が予め定められた断線検出値以下になった場合に、前記パルス信号生成部に前記パルス信号の周期を変更させる断線検出部と、
前記第1の方向指示灯と前記第2の方向指示灯の点灯状態を検出する点灯状態検出部と、
電流が流れると点灯する1つ又は複数のインジケータを有するインジケータ部と、
前記点灯状態検出部で検出された前記点灯状態に応じて前記1つのインジケータを駆動して点灯させ、又は、前記点灯状態に応じて前記複数のインジケータのうちの少なくとも何れかを駆動して点灯させるインジケータ駆動部と、を備える
ことを特徴とする方向指示装置。 - 前記インジケータ部は、第1のインジケータと、第2のインジケータと、を有し、
前記インジケータ駆動部は、前記第1の方向指示灯が点灯している第1の点灯期間に前記第1のインジケータを駆動して点灯させ、一方、前記第1の方向指示灯が点灯していない第1の消灯期間に前記第1のインジケータを駆動せず点灯させず、さらに、前記第2の方向指示灯が点灯している第2の点灯期間に前記第2のインジケータを駆動して点灯させ、一方、前記第2の方向指示灯が点灯していない第2の消灯期間に前記第2のインジケータを駆動せず点灯させない
ことを特徴とする請求項1に記載の方向指示装置。 - 前記点灯状態検出部は、前記第1の方向指示灯の一端の電圧が予め定められた第1のしきい値電圧以上である場合、前記第1の方向指示灯が点灯していることを検出し、一方、前記第1の方向指示灯の一端の電圧が前記第1のしきい値電圧未満である場合、前記第1の方向指示灯が点灯していないことを検出し、さらに、前記第2の方向指示灯の一端の電圧が予め定められた第2のしきい値電圧以上である場合、前記第2の方向指示灯が点灯していることを検出し、一方、前記第2の方向指示灯の一端の電圧が前記第2のしきい値電圧未満である場合、前記第2の方向指示灯が点灯していないことを検出する
ことを特徴とする請求項2に記載の方向指示装置。 - 前記インジケータ駆動部は、
前記電源電圧が供給される一端と、前記第1の点灯期間に第1のインジケータ駆動電流を出力し、前記第1の消灯期間に前記第1のインジケータ駆動電流を出力しない他端と、を有する第2のスイッチング素子と、
前記電源電圧が供給される一端と、前記第2の点灯期間に第2のインジケータ駆動電流を出力し、前記第2の消灯期間に前記第2のインジケータ駆動電流を出力しない他端と、を有する第3のスイッチング素子と、を有し、
前記第1のインジケータは、前記第2のスイッチング素子の他端に一端が接続され、接地に他端が接続され、
前記第2のインジケータは、前記第3のスイッチング素子の他端に一端が接続され、接地に他端が接続されている
ことを特徴とする請求項2または請求項3に記載の方向指示装置。 - 前記第2のスイッチング素子は、前記電源電圧が供給されるソースと、前記第1のインジケータの一端に接続されたドレインと、を有する第1のP型MOSトランジスタで構成され、
前記第3のスイッチング素子は、前記電源電圧が供給されるソースと、前記第2のインジケータの一端に接続されたドレインと、を有する第2のP型MOSトランジスタで構成され、
前記点灯状態検出部は、
前記電源電圧が一端に供給され、前記第1のP型MOSトランジスタのゲートに他端が接続された第1の抵抗と、
前記電源電圧が一端に供給され、前記第2のP型MOSトランジスタのゲートに他端が接続された第2の抵抗と、
前記第1の抵抗の他端に接続された一端と、前記第1の方向指示灯の一端に接続された制御端子と、接地に接続された他端と、を有し、前記第1の方向指示灯の一端の電圧が前記第1のしきい値電圧以上の時にオンする第4のスイッチング素子と、
前記第2の抵抗の他端に接続された一端と、前記第2の方向指示灯の一端に接続された制御端子と、接地に接続された他端と、を有し、前記第2の方向指示灯の一端の電圧が前記第2のしきい値電圧以上の時にオンする第5のスイッチング素子と、を有する
ことを特徴とする請求項4に記載の方向指示装置。 - 前記インジケータ部は、前記1つのインジケータを有し、
前記インジケータ駆動部は、前記第1の方向指示灯と前記第2の方向指示灯の何れかが点灯している点灯期間に前記1つのインジケータを駆動して点灯させ、一方、前記第1の方向指示灯と前記第2の方向指示灯の両方が点灯していない消灯期間に前記1つのインジケータを駆動せず点灯させない
ことを特徴とする請求項1に記載の方向指示装置。 - 前記点灯状態検出部は、前記方向指示スイッチの前記第1端子の電圧が予め定められたしきい値電圧以上である場合、前記第1の方向指示灯と前記第2の方向指示灯の何れかが点灯していることを検出し、一方、前記方向指示スイッチの前記第1端子の電圧が前記しきい値電圧未満である場合、前記第1の方向指示灯と前記第2の方向指示灯の両方が点灯していないことを検出する
ことを特徴とする請求項6に記載の方向指示装置。 - 前記インジケータ駆動部は、前記電源電圧が供給される一端と、前記点灯期間にインジケータ駆動電流を出力し、前記消灯期間に前記インジケータ駆動電流を出力しない他端と、を有する第2のスイッチング素子を有し、
前記1つのインジケータは、前記第2のスイッチング素子の他端に一端が接続され、接地に他端が接続されている
ことを特徴とする請求項7に記載の方向指示装置。 - 前記第2のスイッチング素子は、前記電源電圧が供給されるソースと、前記1つのインジケータの一端に接続されたドレインと、を有するP型MOSトランジスタで構成され、
前記点灯状態検出部は、
前記電源電圧が一端に供給され、前記P型MOSトランジスタのゲートに他端が接続された抵抗と、
前記抵抗の他端に接続された一端と、前記方向指示スイッチの前記第1端子に接続された制御端子と、接地に接続された他端と、を有し、前記方向指示スイッチの前記第1端子の電圧が前記しきい値電圧以上の時にオンする第3のスイッチング素子と、を有する
ことを特徴とする請求項8に記載の方向指示装置。
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JP2017024455A (ja) * | 2015-07-16 | 2017-02-02 | 日本精機株式会社 | 車載照明灯の制御装置 |
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JPWO2017195742A1 (ja) * | 2016-05-10 | 2019-04-04 | 日本精機株式会社 | メータ |
JP2018034699A (ja) * | 2016-08-31 | 2018-03-08 | ダイハツ工業株式会社 | 車両用方向指示灯 |
CN106494306A (zh) * | 2016-10-23 | 2017-03-15 | 郑建灵 | 一种转向报警闪光器 |
JP2018140712A (ja) * | 2017-02-28 | 2018-09-13 | 株式会社デンソー | 断線検知装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2014024245A1 (ja) | 2016-07-21 |
EP2881286B1 (en) | 2018-05-23 |
EP2881286A4 (en) | 2016-08-03 |
EP2881286A1 (en) | 2015-06-10 |
JP5426057B1 (ja) | 2014-02-26 |
US20140232285A1 (en) | 2014-08-21 |
US9150149B2 (en) | 2015-10-06 |
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