WO2014024246A1 - 方向指示装置 - Google Patents
方向指示装置 Download PDFInfo
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- WO2014024246A1 WO2014024246A1 PCT/JP2012/069993 JP2012069993W WO2014024246A1 WO 2014024246 A1 WO2014024246 A1 WO 2014024246A1 JP 2012069993 W JP2012069993 W JP 2012069993W WO 2014024246 A1 WO2014024246 A1 WO 2014024246A1
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- terminal
- indicator lamp
- resistance value
- direction indicator
- voltage
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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
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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
- B60Q1/46—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 giving flashing caution signals during drive, other than signalling change of direction, e.g. flashing the headlights or hazard lights
Definitions
- the present invention relates to a direction indicating device using an LED element as a direction indicating lamp.
- direction indication device for an automobile or a motorcycle, for example, one shown in FIG. 3 is known.
- light bulbs bulbs
- winkers direction indication lights
- the oscillator 104a when the direction indicating switch SW1 is turned on to the L terminal side, the oscillator 104a generates an oscillation pulse signal.
- the buffer 104b buffers the oscillation pulse signal and outputs a pulse signal.
- the N-type MOS transistor NM101 causes a drive current having a magnitude corresponding to the amplitude of the pulse signal supplied to the gate to flow from the drain to which the power supply voltage VDD is supplied to the source.
- the drive current flows to the light bulbs 102LF and 102LR of the direction indicator lamp 102L via the current detection resistor R101 and the direction indicator switch SW1. Thereby, the direction indicating operation in which the direction indicating lamp 102L blinks at the cycle of the oscillation pulse signal is performed.
- the drive current flows to the direction indicator lamps 102L and 102R via the hazard switch SW2, and a hazard operation is performed in which all the direction indicator lamps 102L and 102R blink.
- the drive current increases compared to that in the direction indication operation, and the current flowing through each of the direction indication lamps 102L and 102R does not change significantly from that in the direction indication operation.
- the power supply voltage of the battery B used in a motorcycle or the like varies greatly depending on the state of the vehicle body. For example, in the 12V system, it varies to about 8 to 15V. Further, the bulb has a characteristic that when the voltage rises, the temperature of the filament in the bulb rises and the resistance value of the filament rises so that the current flowing through the bulb is suppressed. Therefore, even if the power supply voltage rises, the current flowing through the bulb does not change greatly, so there is no practical problem.
- a direction indicating device described in JP1-90831A is also known as a device similar to this direction indicating device.
- the LED element has a characteristic that current increases as voltage increases.
- the current increases when the power supply voltage is high and the LED element generates heat, or the current exceeds the rated current. May be damaged.
- the current decreases when the power supply voltage is low, and the LED element becomes dark or does not light up. Therefore, for the purpose of extending the life of the LED element and stabilizing the brightness, it is necessary to provide a constant current circuit that controls the current flowing through the LED element to be constant even when the power supply voltage changes.
- the load direction indicator lamps increase to 4 lamps, twice that of the direction indication operation. Therefore, if a constant current circuit is provided, the current flowing through the LED elements of each direction indicator lamp is changed to the direction indication operation. There is a problem that it decreases to about half of the time and darkens.
- the present invention provides a direction indication device that is not easily affected by fluctuations in power supply voltage and that can reduce the difference in brightness of a direction indication lamp using an LED element during a direction indication operation and a hazard operation. Objective.
- 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; One end is connected to the other end of the first switching element, the resistance value can be switched to the first resistance value or the second resistance value, and the second resistance value is a variable resistance lower than the first resistance value.
- Circuit 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.
- Direction switch An ON state in which the first terminal, the second terminal, and the third terminal of the direction indicating switch are electrically connected, and an electrical connection between the first terminal, the second terminal, and the third terminal.
- a hazard switch that can be switched between an off state and an open state;
- 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;
- the detection voltage between both ends of the variable resistance circuit is detected, and the amplitude of the pulse signal is supplied to the pulse signal generation unit so that the detection voltage corresponding to the pulse wave of the pulse signal approaches a predetermined target voltage value.
- a voltage detector for controlling The variable resistance is detected during a period in which both the first direction indicator lamp and the second direction indicator lamp are lit, by detecting lighting states of the first direction indicator lamp and the second direction indicator lamp.
- the resistance value of the circuit is switched to the second resistance value, and the resistance value of the variable resistance circuit is changed to the first resistance value during a period when either the first direction indicator lamp or the second direction indicator lamp is lit.
- a lighting state detection unit that switches to a resistance value of 1.
- the first resistance value may be set to be twice the second resistance value.
- the variable resistance circuit is: A first resistor having one end connected to the other end of the first switching element; A second resistor having one end connected to the other end of the first resistor and the other end connected to the first terminal of the direction indicating switch; A second switching element that electrically connects both ends of the first resistor when turned on and opens both ends of the first resistor when turned off;
- the resistance value of the variable resistance circuit may be the first resistance value when the second switching element is off, and the second resistance value when the second switching element is 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 second switching element is a P-type MOS transistor having a source connected to one end of the first resistor and a drain connected to the other end of the first resistor;
- the lighting state detection unit A third resistor having one end connected to the source of the P-type MOS transistor and the other end connected to the gate of the P-type MOS transistor; One end connected to the other end of the third resistor, and a control terminal connected to one end of the second direction indicator lamp, the voltage at one end of the second direction indicator lamp being the first
- a third switching element that is turned on when the threshold voltage is 2 or more;
- a fourth switching element that is turned on when a voltage at one end of the lamp is equal to or higher than the first threshold voltage.
- the lighting state detection unit sets the resistance value of the variable resistance circuit to the second resistance value lower than the first resistance value during a period in which both the first and second direction indicator lamps are lit.
- the resistance value of the variable resistance circuit is switched to the first resistance value during a period when either the first or second direction indicator lamp is lit.
- the voltage detection unit causes the pulse signal generation unit to control the amplitude of the pulse signal so that the detection voltage across the variable resistance circuit corresponding to the pulse wave of the pulse signal approaches the target voltage value.
- the constant current control is performed after the drive current has increased compared to the direction indicating operation during the hazard operation, and therefore the difference in current flowing through the direction indicating lamp during the direction indicating operation and the hazard operation can be reduced.
- 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. 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 indicating device includes a bootstrap circuit 1, a direction indicating switch SW1, a hazard switch SW2, a first direction indicating lamp 2L, a second direction indicating lamp 2R, and an internal power source 3.
- a pulse signal generation unit 4 an N-type MOS transistor (first switching element) NM 1, a variable resistance circuit 5, a voltage detection unit 6, and a lighting state detection unit 7.
- 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 variable resistance circuit 5, the voltage detection unit 6, and the lighting state detection unit 7 are blinker relays (direction indication Lamp 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 SW1.
- 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 SW1 has a first terminal, a second terminal (L terminal), and a third terminal (R terminal).
- the direction indicating switch SW1 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 hazard switch SW2 is electrically connected between the first terminal, the second terminal, and the third terminal of the direction indicating switch SW1, and electrically connected between the first terminal, the second terminal, and the third terminal. It is possible to switch between the open and open states.
- 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 SW1 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 has one end (anode side) connected to the third terminal of the direction indication switch SW1, the other end (cathode side) is connected to the ground, and lights when 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 diode D1 and the capacitive element C1 are supplied from the power source B. Then, a current flows to the ground GND through the direction indicating switch SW1 or the hazard switch SW2 and at least one of the first direction indicating lamp 2L and the second direction indicating lamp 2R. As a result, 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 variable resistance circuit 5 has one end connected to the source of the N-type MOS transistor NM1, and the other end connected to the first terminal of the direction indicating switch SW1.
- the variable resistance circuit 5 can switch the resistance value between one end and the other end to the first resistance value or the second resistance value.
- the first resistance value is set to about twice the second resistance value.
- variable resistance circuit 5 includes a first resistor R1, a second resistor R2, and a P-type MOS transistor (second switching element) PM1.
- the first resistor R1 has one end connected to the source of the N-type MOS transistor NM1.
- the second resistor R2 has one end connected to the other end of the first resistor R1 and the other end connected to the first terminal of the direction indicating switch SW1.
- the P-type MOS transistor PM1 electrically connects both ends of the first resistor R1 when turned on, and opens both ends of the first resistor R1 when turned off.
- the P-type MOS transistor PM1 has a source connected to one end of the first resistor R1, and a drain connected to the other end of the first resistor R1.
- the resistance value of the variable resistance circuit 5 is the first resistance value when the P-type MOS transistor PM1 is off, and the second resistance value when the P-type MOS transistor PM1 is on.
- the voltage detector 6 detects a detection voltage between both ends of the variable resistor circuit 5, that is, a detection voltage between one end of the first resistor R1 and the other end of the second resistor R2, and detects a pulse wave of the pulse signal P.
- the pulse signal generation unit 4 controls the amplitude of the pulse signal P so that the detection voltage corresponding to 1 approaches the predetermined target voltage value. Thereby, constant current control is performed so that the drive current I corresponding to the pulse wave of the pulse signal P becomes substantially constant.
- the lighting state detection unit 7 detects the lighting state of the first direction indicator lamp 2L and the second direction indicator lamp 2R. And the lighting state detection part 7 is the resistance value of the variable resistance circuit 5 in the period when both the 1st direction indicator lamp 2L and the 2nd direction indicator lamp 2R are lit according to the detected lighting state. Is switched to the second resistance value, and the resistance value of the variable resistance circuit 5 is switched to the first resistance value during the period when either the first direction indicator lamp 2L or the second direction indicator lamp 2R is lit. .
- the lighting state detection unit 7 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 7 indicates that the second direction indicator lamp 2R is lit.
- the voltage at one end of the second direction indicator lamp 2R is equal to or higher than a predetermined second threshold voltage
- the lighting state detector 7 indicates that the second direction indicator lamp 2R is lit.
- 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 lighting state detection unit 7 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 7. Except for the circuit configuration of the lighting state detection unit 7, the configuration is the same as in FIG.
- the lighting state detector 7 includes a third resistor R3, a resistor R4, a resistor R5, an NPN transistor (third switching element) Q1, and an NPN transistor (fourth switching element). Element) Q2.
- the third resistor R3 has one end connected to the source of the P-type MOS transistor PM1, and the other end 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 third resistor R3, and a base (control terminal) connected to one end of the second direction indicator lamp 2R via the resistor R4. Have.
- the NPN transistor Q1 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 is turned off when the voltage is lower than the second threshold voltage.
- the NPN transistor Q2 includes a collector (one end) connected to the emitter (the other end) of the NPN transistor Q1, and a base (control terminal) connected to one end of the first direction indicator lamp 2L via a resistor R5. A grounded emitter (the other end).
- the NPN transistor Q2 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 turned off when the voltage is lower than the first threshold voltage.
- the driving current I having a magnitude corresponding to the amplitude of the pulse signal P is The first direction indicator lamp 2L flows through the direction indicator switch SW1. Thereby, the first direction indicator lamp 2L blinks at the frequency of the pulse signal P.
- the drive current I is flowing, the voltage at one end of the first direction indicator lamp 2L becomes equal to or higher than the first threshold voltage, so the NPN transistor Q2 is turned on.
- the NPN transistor Q1 since the voltage at one end of the second direction indicator lamp 2R through which the drive current I does not flow is less than the second threshold voltage, the NPN transistor Q1 is off. Therefore, since no current flows through the resistor R3, the P-type MOS transistor PM1 is off, and the resistance value between both ends of the variable resistance circuit 5 is the first resistance value. That is, the drive current I flows through the first and second resistors R1 and R2, and does not flow through the P-type MOS transistor PM1.
- the second direction indicating lamp 2R blinks at the frequency of the pulse signal P.
- the NPN transistor Q1 is turned on.
- the NPN transistor Q2 is off. Accordingly, the P-type MOS transistor PM1 is off, and the resistance value between both ends of the variable resistance circuit 5 is the first resistance value.
- the drive current I having a magnitude corresponding to the amplitude of the pulse signal P is applied to the first and second direction indicator lamps 2L and 2R via the hazard switch SW2. Divide and flow. As a result, the first and second direction indicator lamps 2L and 2R blink at the frequency of the pulse signal P.
- the voltage at one end of the first direction indicator lamp 2L becomes equal to or higher than the first threshold voltage, and the voltage at one end of the second direction indicator lamp 2R is second. Therefore, the two NPN transistors Q1 and Q2 are turned on. Accordingly, since a current flows through the resistor R3, the P-type MOS transistor PM1 is turned on, and the resistance value between both ends of the variable resistance circuit 5 becomes the second resistance value. That is, almost all of the drive current I output from the N-type MOS transistor NM1 flows through the P-type MOS transistor PM1, and hardly flows through the first resistor R1.
- the voltage detector 6 detects the detected voltage between both ends of the variable resistor circuit 5 corresponding to the pulse wave of the pulse signal P.
- the pulse signal generator 4 is caused to increase the amplitude of the pulse signal P so as to approach the target voltage value as compared with the direction indicating operation.
- the drive current I increases approximately twice as much as during the direction indicating operation, and constant current control is performed. Therefore, the current flowing through each of the first and second direction indicating lamps 2L and 2R is The current during the direction indicating operation is almost the same. Accordingly, it is possible to prevent the first and second direction indicating lights 2L and 2R from becoming dark during the hazard operation. That is, the difference in brightness when the first and second direction indicating lamps 2L and 2R are turned on between the direction indicating operation and the hazard operation can be almost eliminated.
- the lighting state detection unit 7 determines the resistance value of the variable resistance circuit 5 during the period in which both the first and second direction indicator lamps 2L and 2R are lit. Is switched to a second resistance value lower than the first resistance value, and the resistance value of the variable resistance circuit 5 is changed to the first resistance value during the period when one of the first and second direction indicator lamps 2L, 2R is lit. Switch to resistance value. Further, the voltage detection unit 6 causes the pulse signal generation unit 4 to control the amplitude of the pulse signal P so that the detection voltage across the variable resistance circuit 5 corresponding to the pulse wave of the pulse signal P approaches the target voltage value. .
- the constant current control is performed after the drive current I is increased compared to the direction indicating operation during the hazard operation, so that the first and second direction indicating lamps 2L and 2R are turned on during the direction indicating operation and the hazard operation.
- the difference in current flowing through the can be reduced.
- the current flowing through the LED elements of the first and second direction indicator lamps 2L and 2R can be made almost constant even when the power supply voltage VDD changes, thus extending the life of the LED elements.
- the brightness can be stabilized.
- the second resistance value is lower than the first resistance value, the drive current I increases during the hazard indicating operation compared to the direction indicating operation. Therefore, the first and second directions during the direction indicating operation and during the hazard operation. The difference in brightness when the indicator lights 2L and 2R are turned on can be reduced. In addition, as the first resistance value is closer to twice the second resistance value, the brightness when the first and second direction indicator lamps 2L and 2R are lit during the direction indication operation and the hazard operation is increased. The difference is reduced.
- a P-type MOS transistor may be used instead of the N-type MOS transistor NM1.
- the bootstrap circuit 1 need not be provided.
- 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.
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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、
前記第1のスイッチング素子の他端に一端が接続され、抵抗値を第1の抵抗値又は第2の抵抗値に切り替え可能であり、第2の抵抗値は第1の抵抗値より低い可変抵抗回路と、
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、前記可変抵抗回路の他端に前記第1端子が接続された方向指示スイッチと、
前記方向指示スイッチの前記第1端子と前記第2端子と前記第3端子の間を電気的に接続するオン状態と、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オフ状態とを切り替え可能であるハザードスイッチと、
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、
前記可変抵抗回路の両端間の検出電圧を検出し、前記パルス信号のパルス波に対応した前記検出電圧が予め定められた目標電圧値に近づくように、前記パルス信号生成部に前記パルス信号の振幅を制御させる電圧検出部と、
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し、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る期間に、前記可変抵抗回路の抵抗値を前記第2の抵抗値に切り替え、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期間に、前記可変抵抗回路の抵抗値を前記第1の抵抗値に切り替える点灯状態検出部と、を備える
ことを特徴とする。
前記第1の抵抗値は、前記第2の抵抗値の2倍に設定されていてもよい。
前記可変抵抗回路は、
前記第1のスイッチング素子の他端に一端が接続された第1の抵抗と、
前記第1の抵抗の他端に一端が接続され、前記方向指示スイッチの前記第1端子に他端が接続された第2の抵抗と、
オン時に前記第1の抵抗の両端を電気的に接続し、オフ時に前記第1の抵抗の両端を開放する第2のスイッチング素子と、を有し、
前記可変抵抗回路の抵抗値は、前記第2のスイッチング素子がオフ時に前記第1の抵抗値であり、前記第2のスイッチング素子がオン時に前記第2の抵抗値であってもよい。
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。
前記第2のスイッチング素子は、前記第1の抵抗の一端に接続されたソースと、前記第1の抵抗の他端に接続されたドレインと、を有するP型MOSトランジスタであり、
前記点灯状態検出部は、
前記P型MOSトランジスタのソースに一端が接続され、前記P型MOSトランジスタのゲートに他端が接続された第3の抵抗と、
前記第3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、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3のスイッチング素子と、
前記第3のスイッチング素子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、を有してもよい。
SW1 方向指示スイッチ
SW2 ハザードスイッチ
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 可変抵抗回路
6 電圧検出部
7 点灯状態検出部
R1 第1の抵抗
R2 第2の抵抗
R3 第3の抵抗
R4 抵抗
R5 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 P型MOSトランジスタ(第2のスイッチング素子)
Q1 NPN型トランジスタ(第3のスイッチング素子)
Q2 NPN型トランジスタ(第4のスイッチング素子)
Claims (5)
- 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、
前記第1のスイッチング素子の他端に一端が接続され、抵抗値を第1の抵抗値又は第2の抵抗値に切り替え可能であり、第2の抵抗値は第1の抵抗値より低い可変抵抗回路と、
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、前記可変抵抗回路の他端に前記第1端子が接続された方向指示スイッチと、
前記方向指示スイッチの前記第1端子と前記第2端子と前記第3端子の間を電気的に接続するオン状態と、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オフ状態とを切り替え可能であるハザードスイッチと、
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、
前記可変抵抗回路の両端間の検出電圧を検出し、前記パルス信号のパルス波に対応した前記検出電圧が予め定められた目標電圧値に近づくように、前記パルス信号生成部に前記パルス信号の振幅を制御させる電圧検出部と、
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し、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る期間に、前記可変抵抗回路の抵抗値を前記第2の抵抗値に切り替え、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期間に、前記可変抵抗回路の抵抗値を前記第1の抵抗値に切り替える点灯状態検出部と、を備える
ことを特徴とする方向指示装置。 - 前記第1の抵抗値は、前記第2の抵抗値の2倍に設定されていることを特徴とする請求項1に記載の方向指示装置。
- 前記可変抵抗回路は、
前記第1のスイッチング素子の他端に一端が接続された第1の抵抗と、
前記第1の抵抗の他端に一端が接続され、前記方向指示スイッチの前記第1端子に他端が接続された第2の抵抗と、
オン時に前記第1の抵抗の両端を電気的に接続し、オフ時に前記第1の抵抗の両端を開放する第2のスイッチング素子と、を有し、
前記可変抵抗回路の抵抗値は、前記第2のスイッチング素子がオフ時に前記第1の抵抗値であり、前記第2のスイッチング素子がオン時に前記第2の抵抗値である
ことを特徴とする請求項1または請求項2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1から請求項3の何れかに記載の方向指示装置。 - 前記第2のスイッチング素子は、前記第1の抵抗の一端に接続されたソースと、前記第1の抵抗の他端に接続されたドレインと、を有するP型MOSトランジスタであり、
前記点灯状態検出部は、
前記P型MOSトランジスタのソースに一端が接続され、前記P型MOSトランジスタのゲートに他端が接続された第3の抵抗と、
前記第3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、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3のスイッチング素子と、
前記第3のスイッチング素子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、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。
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JP2013520920A JP5502238B1 (ja) | 2012-08-06 | 2012-08-06 | 方向指示装置 |
US14/003,216 US8963706B2 (en) | 2012-08-06 | 2012-08-06 | Direction indicating apparatus |
EP12866993.4A EP2881284B1 (en) | 2012-08-06 | 2012-08-06 | Direction-indication device |
PCT/JP2012/069993 WO2014024246A1 (ja) | 2012-08-06 | 2012-08-06 | 方向指示装置 |
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WO2014024246A1 (ja) * | 2012-08-06 | 2014-02-13 | 新電元工業株式会社 | 方向指示装置 |
WO2016113857A1 (ja) * | 2015-01-14 | 2016-07-21 | 新電元工業株式会社 | 方向指示システムおよび方向指示装置 |
CN109466432B (zh) * | 2018-11-16 | 2020-08-07 | 浙江吉利汽车研究院有限公司 | 一种驻车灯光***及车辆 |
CN110435532B (zh) * | 2019-08-21 | 2020-12-18 | 宁波吉利汽车研究开发有限公司 | 一种转向灯的控制方法、***及车辆 |
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JP5502238B1 (ja) | 2014-05-28 |
US20140232283A1 (en) | 2014-08-21 |
US8963706B2 (en) | 2015-02-24 |
EP2881284A1 (en) | 2015-06-10 |
EP2881284A4 (en) | 2016-07-20 |
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EP2881284B1 (en) | 2018-02-28 |
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