WO2016135814A1 - Led駆動回路 - Google Patents
Led駆動回路 Download PDFInfo
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- WO2016135814A1 WO2016135814A1 PCT/JP2015/054966 JP2015054966W WO2016135814A1 WO 2016135814 A1 WO2016135814 A1 WO 2016135814A1 JP 2015054966 W JP2015054966 W JP 2015054966W WO 2016135814 A1 WO2016135814 A1 WO 2016135814A1
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- terminal
- detection
- voltage
- circuit
- switch device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
- B62J6/16—Arrangement of switches
- B62J6/165—Wireless switches
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- 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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
- B62J6/01—Electric circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
- B62J6/02—Headlights
- B62J6/022—Headlights specially adapted for motorcycles or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2101/00—Point-like light sources
Definitions
- the present invention relates to an LED drive circuit.
- an input circuit for detecting on / off of a switch device for a user to operate a headlight, turn signal or the like of an automobile or a motorcycle.
- this conventional input circuit in order to prevent erroneous detection of ON / OFF of the switch device due to the leak current when the switch device is submerged, the leak current is released to the ground.
- the conventional input circuit takes measures such as devising the lamp wiring and letting the leakage current escape to the lamp.
- the switch device in an LED drive device that is an input circuit for detecting on / off of a switch device for a user to operate an LED lamp such as a headlight or a blinker, the switch device is wet while reducing costs. It is an object of the present invention to suppress erroneous detection of ON / OFF of the switch device due to the leakage current of the current.
- An LED driving circuit includes: An LED driving circuit that controls driving of an LED lamp according to on / off of a mechanical switch device, A first terminal to which one end of the current path of the switch device is connected; The second terminal to which the other end side of the current path of the switch device is connected, and the switch device and the battery are connected in series between the first terminal and the second terminal.
- the second terminal A detection circuit for periodically detecting a current flowing through the first terminal and outputting a detection signal corresponding to the detection result from the first node; A comparison circuit that compares a detection voltage according to the detection signal with a threshold voltage and outputs a comparison result signal according to the comparison result; A control circuit for controlling the current detection operation of the detection circuit and controlling the driving of the LED lamp based on the comparison result signal;
- the control circuit includes: When the comparison result signal indicates that the detected voltage is equal to or higher than the threshold voltage, it is determined that the switch device is turned on and that one end and the other end of the current path are conductive, On the other hand, when the comparison result signal indicates that the detected voltage is less than the threshold voltage, it is determined that the switch device is turned off and the one end and the other end of the current path are disconnected. It is characterized by.
- the detection circuit includes: A first switch element having one end connected to the first terminal and controlled to be turned on or off by the control circuit; A detecting capacitor having one end connected to the other end of the first switch element and the other end connected to the first node; A detection resistor having one end connected to the first node and the other end connected to the second terminal; Between the other end of the first switch element and the second terminal, one end is connected to the other end of the first switch element so as to be connected in parallel with the detection resistor and the detection capacitor. A discharge resistor connected at the other end to the second terminal,
- the control circuit includes: Controlling the first switch element to periodically turn on and off;
- the detection circuit includes: The detection signal is output from the first node.
- the detection circuit includes: A second switch element connected in series with the discharge resistor between the other end of the first switch element and the second terminal;
- the control circuit includes: When turning on the first switch element, control to turn off the second switch element, Further, when the first switch element is turned off, the second switch element is controlled to be turned on.
- It further includes a peak hold circuit that holds the peak voltage of the detection signal and outputs the held peak voltage as the detection voltage from the second node.
- the peak hold circuit is: A holding diode having an anode connected to the first node and a cathode connected to the second node; A holding capacitor connected between the second node and the second terminal.
- the comparison circuit is A voltage dividing circuit that outputs a divided voltage obtained by dividing a voltage between the first terminal and the second terminal as the threshold voltage;
- a comparator that inputs the detection voltage and the threshold voltage, compares the detection voltage with the threshold voltage, and outputs the comparison result signal in accordance with the comparison result;
- the voltage dividing circuit includes: A first voltage dividing resistor having one end connected to the first terminal and the other end connected to a voltage dividing node; A second voltage dividing resistor having one end connected to the voltage dividing node and the other end connected to a second terminal; The voltage dividing circuit outputs the voltage of the voltage dividing node as the threshold voltage.
- the threshold voltage is determined by the detection circuit when the control circuit periodically switches the first switch element on and off in a state where the switch device is turned off and a leakage current flows in the current path. It is set to be higher than the detection voltage which is a peak voltage of the detection signal to be output.
- the threshold voltage is a peak voltage of the detection signal output from the detection circuit when the control circuit periodically switches on and off the first switch element in a state where the switch device is on. It is characterized by being set to be lower than a certain detected voltage.
- the switch device and the battery include the first terminal and the second so that the positive side of the battery is connected to the first terminal and the negative side of the battery is connected to the second terminal. It is characterized by being connected in series with the terminal.
- the capacitance value of the detection capacitor is larger than the capacitance value of the holding capacitor.
- the LED drive circuit is mounted on a motorcycle,
- the LED lamp is a headlight of the motorcycle or a winker of the motorcycle,
- the switch device is a steering wheel switch of the motorcycle that is operated by a user and controls driving of the LED lamp.
- a power supply circuit connected to the first terminal and configured to supply power to the control circuit based on a current input from the first terminal;
- the power supply circuit operates with a current input from the first terminal when the switch device is turned on, or when the switch device is turned off and a leakage current flows through the current path, and Supplying power to the control circuit based on the current input from the first terminal;
- the control circuit operates with power supplied from the power supply circuit and drives the LED lamp.
- the first switch element is a pMOS transistor having a source connected to the first terminal, a drain connected to one end of the detection capacitor, and a gate voltage controlled by the control circuit. .
- An LED drive circuit is an LED drive circuit that controls driving of an LED lamp in accordance with on / off of a mechanical switch device, and one end side of a current path of the switch device is connected. A second terminal to which the other end of the current path of the switch device is connected, the switch device and the battery between the first terminal and the second terminal.
- the detection circuit which periodically detects the current flowing through the first terminal and outputs a detection signal corresponding to the detection result from the first node, and the detection A comparison circuit that compares a detection voltage according to the signal and a threshold voltage, and outputs a comparison result signal according to the comparison result, and controls the current detection operation of the detection circuit, and the comparison result signal Based on said L And a control circuit for controlling the driving of the D lamp.
- the control circuit turns on the switch device and conducts between one end and the other end of the current path.
- the switch device is turned off and the current path is connected between one end and the other end. Is determined to be blocked.
- the LED driving circuit according to the present invention does not require adjustment of detection timing and use of expensive elements such as a hall device. Furthermore, since the LED drive circuit according to the present invention can be applied to a relatively inexpensive mechanical switch device (such as a switch device with a low waterproof function), the cost can be reduced.
- the LED drive circuit according to the present invention can suppress erroneous detection of ON / OFF of the switch device due to leakage current when the switch device is wet while reducing the cost.
- FIG. 1 is a diagram illustrating an example of a configuration of an LED drive system 1000 according to the first embodiment.
- FIG. 2 is a waveform diagram showing an example of operation waveforms of the LED drive circuit 100 shown in FIG.
- FIG. 3 is a waveform diagram showing another example of operation waveforms of the LED drive circuit 100 shown in FIG.
- FIG. 4 is a diagram illustrating an example of the configuration of the LED drive system 2000 according to the second embodiment.
- the LED drive system 1000 (FIG. 1) according to the first embodiment includes a battery B, a mechanical switch device SW connected to the battery B, an LED lamp 101, and an on / off state of the mechanical switch device SW. And an LED driving circuit 100 that controls the driving of the LED lamp 101 in response to turning off.
- the LED drive system 1000 is mounted on, for example, a motorcycle.
- the LED lamp 101 is a headlight of the motorcycle or a winker of the motorcycle.
- the switch device SW is a steering wheel switch of the motorcycle that is operated by the user and controls the driving of the LED lamp 101.
- the LED drive circuit 100 includes a first terminal T1 to which one end side of the current path of the switch device SW is connected, and a second terminal T2 to which the other end side of the current path of the switch device SW is connected ( FIG. 1).
- the switch device SW and the battery B are connected in series between the first terminal T1 and the second terminal T2.
- one end of the current path of the switch device SW is connected to the first terminal T1
- the other end of the current path of the switch device SW is connected to the positive electrode of the battery B
- the negative electrode of the battery B is the second.
- the switch device SW and the battery B are connected to the first terminal T1 and the second terminal so that the positive side of the battery B is connected to the first terminal T1 and the negative side of the battery B is connected to the second terminal T2. Are connected in series with the terminal T2.
- the second terminal T2 is grounded.
- the LED drive circuit 100 includes a detection circuit DC that periodically detects a current flowing through the first terminal T1 and outputs a detection signal SX corresponding to the detection result from the first node N1. Further, the LED drive circuit 100 includes a comparison circuit CC that compares the detection voltage VZ according to the detection signal SX with the threshold voltage Vth and outputs a comparison result signal So according to the comparison result.
- the LED drive circuit 100 further includes a peak hold circuit HC that holds the peak voltage of the detection signal SX and outputs the held peak voltage as the detection voltage VZ from the second node N2. Further, the LED drive circuit 100 includes a control circuit CON that controls the current detection operation of the detection circuit DC and controls the drive of the LED lamp 101 based on the comparison result signal So.
- the LED drive circuit 100 includes a power supply circuit SC that is connected to the first terminal T1 and supplies power to the control circuit CON based on the current input from the first terminal T1.
- the detection circuit DC has one end connected to the first terminal T1, and is controlled to be turned on or off by the control circuit CON, and one end is the first switch.
- a detection capacitor CX connected to the other end of the element Q1 and having the other end connected to the first node N1.
- the detection circuit DC has one end connected to the first node N1, the other end connected to the second terminal T2, and one end connected to the other end of the first switch element Q1.
- a discharge resistor RY having the other end connected to the second terminal T2.
- the first switch element Q1 is, for example, a pMOS transistor having a source connected to the first terminal T1 and a drain connected to one end of the detection capacitor CX, as shown in FIG.
- the gate voltage of the pMOS transistor is controlled by a control signal output from the control circuit CON (by a gate signal SG1 output from the predrive circuit PC). That is, the pMOS transistor is controlled to be turned on or off by the gate signal SG1.
- the detection resistor RX is a resistor for detecting the current IX flowing through the detection capacitor CX.
- the discharge resistor RY is connected in parallel with the detection resistor RX and the detection capacitor CX between the other end of the first switch element Q1 and the second terminal T2.
- the discharge resistor RY is a resistor for discharging the electric charge charged in the detection capacitor CX.
- the detection circuit DC having such a configuration outputs a detection signal SX from the first node N1. That is, the detection signal SX is the voltage of the first node N1.
- the switch device SW in a state where the switch device SW is turned off and a leakage current flows in the current path of the switch device SW, or in a state where the switch device SW is turned on and current flows in the current path of the switch device SW
- the first switch element Q1 is turned on (that is, in a state where current flows from the first terminal T1)
- the current IX flows from the first terminal T1 to the detection capacitor CX
- the detection capacitor CX is charged.
- the switch device SW when the switch device SW is turned off and no leakage current flows in the current path of the switch device SW (that is, when no current flows from the first terminal T1), the first switch element Q1 is turned on. Even so, the current IX does not flow from the first terminal T1 to the detection capacitor CX, and the detection capacitor CX is not charged.
- the peak hold circuit HC holds the peak voltage of the detection signal SX, and outputs the held peak voltage from the second node N2 as the detection voltage VZ.
- the peak hold circuit HC includes a holding diode DZ having an anode connected to the first node N1 and a cathode connected to the second node N2, a second node N2, and a second node N2.
- a holding capacitor CZ connected to the terminal T2.
- the capacitance value of the above-described detection capacitor CX is set to be larger than the capacitance value of the holding capacitor CZ.
- the peak voltage of the voltage of the detection signal SX (the voltage VX across the detection resistor RX) is peak-held by the holding capacitor CZ via the holding diode DZ.
- the voltage VZ across the holding capacitor CZ is about the voltage of the battery B.
- the voltage VZ across the holding capacitor CZ is low because the current IX flowing through the detection capacitor CX is small. It can be suppressed.
- the comparison circuit CC compares the detection voltage VZ corresponding to the detection signal SX with the threshold voltage Vth, and outputs the comparison result signal So corresponding to the comparison result.
- the comparison circuit CC compares the detection voltage VZ with the threshold voltage Vth, and outputs a “High” level comparison result signal So if the detection voltage VZ is equal to or higher than the threshold voltage Vth.
- the comparison circuit CC compares the detection voltage VZ with the threshold voltage Vth, and outputs a “Low” level comparison result signal So when the detection voltage VZ is less than the threshold voltage Vth.
- the comparison circuit CC includes a voltage dividing circuit RD that outputs a divided voltage obtained by dividing the voltage between the first terminal T1 and the second terminal T2 as a threshold voltage Vth. And a converter COMP that receives the detection voltage VZ and the threshold voltage Vth, compares the detection voltage VZ with the threshold voltage Vth, and outputs a comparison result signal So according to the comparison result.
- the voltage dividing circuit RD includes a first voltage dividing resistor RD1 having one end connected to the first terminal T1 and the other end connected to the voltage dividing node ND, and one end. Is connected to the voltage dividing node ND, and a second voltage dividing resistor RD2 having the other end connected to the second terminal T2.
- the voltage dividing circuit RD outputs the voltage of the voltage dividing node ND as the threshold voltage Vth.
- the comparison circuit CC includes an output resistor Ro connected between the first terminal T1 and the output of the converter COMP, and a protective resistor RA connected between the second node N2 and the input of the converter COMP. Is provided.
- the comparison circuit CC shown in FIG. 1 is configured using the converter COMP, the comparison circuit CC may be configured using a circuit such as another transistor capable of comparing voltages.
- control circuit CON controls the current detection operation of the detection circuit DC and controls the driving of the LED lamp 101 based on the comparison result signal So.
- the control circuit CON controls the first switch element Q1 to be periodically switched on and off.
- the control circuit CON turns on the switch device SW and switches between one end and the other end of the current path of the switch device SW. It is determined that the gap is conducting.
- control circuit CON turns on the LED lamp 101 by supplying a driving current to the LED lamp 101, for example.
- the control circuit CON turns off the switch device SW and switches between one end and the other end of the current path of the switch device SW. It is determined that there is a break.
- control circuit CON turns off the LED lamp 101, for example, by not supplying a drive current to the LED lamp 101.
- the threshold voltage Vth is such that the control circuit CON periodically switches on and off the first switch element Q1 in a state where the switch device SW is turned off and a leakage current flows in the current path of the switch device SW.
- the detection voltage is set to be higher than the detection voltage VZ that is the peak voltage of the detection signal SX output from the detection circuit DC.
- the control circuit CON turns on the switch device SW and sets one end and the other end of the current path of the switch device SW. It can be determined that the gap is conductive.
- the threshold voltage Vth is the peak of the detection signal SX output from the detection circuit DC when the control circuit CON periodically switches on and off the first switch element Q1 in a state where the switch device SW is on. It is set to be lower than the detection voltage VZ which is a voltage.
- the control circuit CON turns off the switch device SW and sets one end and the other end of the current path of the switch device SW. It can be determined that the interval is interrupted.
- the LED drive circuit 100 controls the gate signal SG1 of the pMOS transistor in accordance with a control signal for controlling the first switch element Q1 output from the control circuit CON (drives the first switch element Q1).
- a pre-drive circuit PC may be omitted. That is, the control circuit CON may directly output the gate signal SG1 to control the first switch element Q1.
- the LED drive circuit 100 further includes an interface circuit IC that processes the comparison result signal So output from the comparison circuit CC and outputs the result to the control circuit CON.
- the control circuit CON receives the comparison result signal So from the comparison circuit CC via the interface circuit IC.
- the interface circuit IC may be omitted.
- the LED drive circuit 100 includes the peak hold circuit HC in order to more reliably detect the on / off of the switch device SW. For example, the LED drive circuit 100 switches depending on whether or not a pulse signal is fed back. If the on / off state of the device SW can be detected, the peak hold circuit HC may be omitted.
- the power supply circuit SC is connected to the first terminal T1, and supplies power to the control circuit CON based on the current input from the first terminal T1.
- the power supply circuit SC has a current input from the first terminal T1 when the switch device SW is turned on or when the switch device SW is turned off and a leakage current flows in the current path of the switch device SW. Works with.
- the power supply circuit SC supplies power to the control circuit CON based on the current input from the first terminal T1.
- control circuit CON operates with the power supplied from the power supply circuit SC and drives the LED lamp. Further, the control circuit CON outputs a pulse signal to the pre-drive circuit PC to periodically switch the first switch element Q1 of the detection circuit DC.
- the pulse signal preferably has a frequency of about 10 to 200 Hz and an on-duty of about 1% to 10%. That is, the switching frequency of the first switch element Q1 by the control circuit CON is 10 to 200 Hz, and the on-duty is about 1% to 10%.
- FIG. 2 shows a waveform in a case where the switching device SW is turned off and the switching device SW is turned off and the leakage current does not flow in the current path of the switching device SW.
- the power supply circuit SC operates with the current input from the first terminal T1 when the switch device SW is turned on.
- the power supply circuit SC supplies power to the control circuit CON based on the current input from the first terminal T1.
- control circuit CON periodically switches the first switch element Q1 of the detection circuit DC (before time t2 in FIG. 2).
- the first switch element Q1 when the first switch element Q1 is controlled to be turned on at time t1, the current IX flows through the detection capacitor CX, and the detection capacitor CX is charged. As a result, the voltage VX across the detection resistor RX (the voltage of the detection signal SX) increases.
- the peak hold circuit HC holds the peak voltage of the voltage VX across the detection resistor RX, and outputs the held peak voltage from the second node N2 as the detection voltage VZ.
- the comparison circuit CC compares the detection voltage VZ with the threshold voltage Vth, and outputs the “High” level comparison result signal So because the detection voltage VZ is equal to or higher than the threshold voltage Vth.
- control circuit CON indicates that the comparison result signal So indicates that the detection voltage VZ is equal to or higher than the threshold voltage Vth, so that the switch device SW is turned on and the current path of the switch device SW is between one end and the other end. Judged to be conductive.
- control circuit CON turns on the LED lamp 101 by supplying a driving current to the LED lamp 101, for example.
- the switch device SW is turned off by the user.
- the operation of the power supply circuit SC is stopped, the control circuit CON is also stopped, the drive current is not supplied to the LED lamp 101, and the LED lamp 101 is turned off.
- FIG. 3 shows a waveform in a case where the switch device SW is turned off and the switch device SW is turned off and a leakage current flows in the current path of the switch device SW.
- the power supply circuit SC operates with the current input from the first terminal T1 when the switch device SW is turned on.
- the power supply circuit SC supplies power to the control circuit CON based on the current input from the first terminal T1.
- control circuit CON periodically switches the first switch element Q1 of the detection circuit DC (before time t2 in FIG. 3).
- the operation up to time t2 in FIG. 3 is the same as that in FIG.
- the switch device SW is turned off by the user.
- the switch device SW is flooded, the switch device SW is turned off, and a leakage current flows in the current path of the switch device SW.
- the power supply circuit SC In a state where the switch device SW is turned off and a leak current flows through the current path of the switch device SW, the power supply circuit SC operates with the current input from the first terminal T1.
- the power supply circuit SC supplies power to the control circuit CON based on the current input from the first terminal T1.
- control circuit CON periodically switches the first switch element Q1 of the detection circuit DC (after time t2 in FIG. 3).
- the first switch element Q1 when the first switch element Q1 is controlled to be on at times t3 and t5, the current IX flows through the detection capacitor CX, and the detection capacitor CX is charged. As a result, the voltage VX across the detection resistor RX (the voltage of the detection signal SX) increases.
- the peak hold circuit HC holds the peak voltage of the voltage VX across the detection resistor RX, and outputs the held peak voltage from the second node N2 as the detection voltage VZ.
- the voltage VZ across the holding capacitor CZ is small because the current IX flowing through the detection capacitor CX is small. It can be kept low.
- the comparison circuit CC compares the detection voltage VZ with the threshold voltage Vth, and outputs the “Low” level comparison result signal So when the detection voltage VZ is less than the threshold voltage Vth (time t4 in FIG. 3). ).
- control circuit CON indicates that the comparison result signal So indicates that the detection voltage VZ is less than the threshold voltage Vth, so that the switch device SW is turned off and a gap between one end and the other end of the current path of the switch device SW is established. Judge that it is shut off.
- control circuit CON turns off the LED lamp 101, for example, by not supplying a drive current to the LED lamp 101.
- an LED drive circuit 100 uses, for example, a relatively inexpensive mechanical switch device SW having a low waterproof property, even if a leakage current flows due to moisture, the switch device SW. ON / OFF can be detected more reliably. And the LED drive circuit 100 can light an LED lamp according to ON / OFF of a switch apparatus.
- an LED drive circuit according to one embodiment of the present invention is an LED drive circuit that controls driving of an LED lamp according to on / off of a mechanical switch device. A first terminal to which one end side is connected and a second terminal to which the other end side of the current path of the switch device is connected, and the switch device and the battery are connected between the first terminal and the second terminal.
- a second terminal connected in series, a current that flows through the first terminal periodically, a detection circuit that outputs a detection signal corresponding to the detection result from the first node, and a detection signal corresponding to the detection signal
- the comparison circuit that compares the detection voltage with the threshold voltage and outputs a comparison result signal according to the comparison result, and controls the current detection operation of the detection circuit, and based on the comparison result signal, the LED lamp A control circuit for controlling the drive and Equipped with a.
- the control circuit determines that the switch device is turned on and that one end and the other end of the current path are conducting. On the other hand, if the comparison result signal indicates that the detected voltage is less than the threshold voltage, it is determined that the switch device is turned off and the current path is disconnected from one end.
- the LED driving circuit according to the present invention does not require adjustment of detection timing and use of expensive elements such as a hall device. Furthermore, since the LED drive circuit according to the present invention can be applied to a relatively inexpensive mechanical switch device (such as a switch device with a low waterproof function), the cost can be reduced.
- the LED drive circuit according to the present invention can suppress erroneous detection of ON / OFF of the switch device due to leakage current when the switch device is wet while reducing the cost.
- the LED driving circuit more reliably detects on / off of a switch device for a user to operate an LED lamp such as a headlight or a winker, and turns the LED lamp on / off of the switch device. It can be turned on according to.
- FIG. 4 is a circuit diagram showing an example of the configuration of the LED drive system 2000 according to the second embodiment.
- the same reference numerals as those in FIG. 1 indicate the same configurations as those in the first embodiment, and the description thereof is omitted.
- the LED drive system 2000 (FIG. 4) according to the second embodiment includes a battery B, a mechanical switch device SW connected to the battery B, an LED lamp 101, and an on / off state of the mechanical switch device SW. And an LED driving circuit 200 that controls the driving of the LED lamp 101 in response to turning off.
- the LED drive circuit 200 according to the second embodiment is different in the configuration of the detection circuit DC from the LED drive circuit 100 of the first embodiment.
- the detection circuit DC has one end connected to the first terminal T1, the first switch element Q1 controlled to be turned on or off by the control circuit CON, and one end connected to the other end of the first switch element Q1.
- the other end of the detection capacitor CX is connected to the first node N1, the one end is connected to the first node N1, the other end is connected to the second terminal T2, and the one end is the first.
- a second switch element Q2 connected in series with the resistor RY.
- the detection circuit DC further includes a second switch element Q2 as compared with the first embodiment.
- the second switch element Q2 is connected in series with the discharging resistor RY between the other end of the first switch element Q1 and the second terminal T2, and is controlled by the control circuit CON.
- This is an nMOS transistor whose gate voltage is controlled.
- the control circuit CON uses the second gate signal SG2 to turn on the second switching element Q2. Control to turn off.
- control circuit CON turns on the second switch element Q2 by the second gate signal SG2 when turning off the first switch element Q1 by the first gate signal SG1 via the pre-drive circuit PC. To control.
- the detection capacitor CX is discharged only when the first switch element Q1 is off. Thereby, the efficiency of charging and discharging of the detection capacitor CX can be improved.
- LED drive circuit 200 Other configurations of the LED drive circuit 200 are the same as those of the LED drive circuit 100 shown in FIG.
- the other operational characteristics of the LED drive circuit 200 having the above configuration are the same as those in the first embodiment.
- the LED drive circuit according to the second embodiment as in the first embodiment, erroneous detection of on / off of the switch device due to leakage current when the switch device is wet while reducing the cost. Can be suppressed.
- the LED driving circuit more reliably detects on / off of a switch device for a user to operate an LED lamp such as a headlight or a winker, and turns the LED lamp on / off of the switch device. It can be turned on according to.
- LED drive circuit demonstrated by the above-mentioned embodiment demonstrated the case where ON / OFF of the switch apparatus for a user operating LED lamps, such as a two-wheeled vehicle headlight and a blinker, was detected, for example, implementation
- a user operating LED lamps such as a two-wheeled vehicle headlight and a blinker
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
機械式のスイッチ装置のオン/オフに応じて、LEDランプの駆動を制御するLED駆動回路であって、
前記スイッチ装置の電流経路の一端側が接続される第1の端子と、
前記スイッチ装置の前記電流経路の他端側が接続される第2の端子であって、前記第1の端子と前記第2の端子との間で前記スイッチ装置とバッテリとが直列に接続される、前記第2の端子と、
前記第1の端子に流れる電流を周期的に検出し、この検出結果に応じた検出信号を第1ノードから出力する検出回路と、
前記検出信号に応じた検出電圧と、閾値電圧とを比較し、この比較結果に応じた比較結果信号を出力する比較回路と、
前記検出回路の電流の検出動作を制御するとともに、前記比較結果信号に基づいて、前記LEDランプの駆動を制御する制御回路と、を備え、
前記制御回路は、
前記比較結果信号が、前記検出電圧が前記閾値電圧以上であることを示す場合には、前記スイッチ装置がオンして前記電流経路の一端と他端との間が導通していると判断し、
一方、前記比較結果信号が、前記検出電圧が前記閾値電圧未満であることを示す場合には、前記スイッチ装置がオフして前記電流経路の一端と他端との間が遮断していると判断する
ことを特徴とする。
前記検出回路は、
一端が前記第1の端子に接続され、前記制御回路によりオン又はオフに制御される第1のスイッチ素子と、
一端が前記第1のスイッチ素子の他端に接続され、他端が前記第1ノードに接続された検出用コンデンサと、
一端が前記第1ノードに接続され、他端が前記第2の端子に接続された検出用抵抗と、
前記第1のスイッチ素子の他端と前記第2の端子との間で、前記検出用抵抗および前記検出用コンデンサと並列に接続されるように、一端が前記第1のスイッチ素子の他端に接続され、他端が前記第2の端子に接続された放電用抵抗と、を備え、
前記制御回路は、
前記第1のスイッチ素子を周期的にオンとオフを切り換えるように制御し、
前記検出回路は、
前記第1ノードから前記検出信号を出力することを特徴とする。
前記検出回路は、
前記第1のスイッチ素子の他端と前記第2の端子との間で、前記放電用抵抗と直列に接続された第2のスイッチ素子をさらに備え、
前記制御回路は、
前記第1のスイッチ素子をオンする場合は、前記第2のスイッチ素子をオフするように制御し、
また、前記第1のスイッチ素子をオフする場合は、前記第2のスイッチ素子をオンするように制御する
ことを特徴とする。
前記検出信号のピーク電圧を保持し、この保持した前記ピーク電圧を前記検出電圧として第2ノードから出力するピークホールド回路をさらに備えることを特徴とする。
前記ピークホールド回路は、
アノードが前記第1ノードに接続され、カソードが前記第2ノードに接続された保持用ダイオードと、
前記第2ノードと前記第2の端子との間に接続された保持用コンデンサと、を備えることを特徴とする。
前記比較回路は、
前記第1の端子と前記第2の端子との間の電圧を分圧した分圧電圧を前記閾値電圧として出力する分圧回路と、
前記検出電圧と前記閾値電圧とが入力され、前記検出電圧と前記閾値電圧とを比較し、この比較結果に応じて前記比較結果信号を出力するコンパレータと、を備える
ことを特徴とする。
前記分圧回路は、
一端が前記第1の端子に接続され、他端が分圧ノードに接続された第1の分圧抵抗と、
一端が前記分圧ノードに接続され、他端が第2の端子に接続された第2の分圧抵抗と、を備え、
前記分圧回路は、前記分圧ノードの電圧を前記閾値電圧として出力することを特徴とする。
前記閾値電圧は、前記スイッチ装置がオフし且つ前記電流経路にリーク電流が流れている状態において、前記制御回路が前記第1のスイッチ素子を周期的にオンとオフを切り換えることで前記検出回路が出力する前記検出信号のピーク電圧である前記検出電圧よりも、高くなるように設定されている
ことを特徴とする。
前記閾値電圧は、前記スイッチ装置がオンしている状態において、前記制御回路が前記第1のスイッチ素子を周期的にオンとオフを切り換えることで前記検出回路が出力する前記検出信号のピーク電圧である前記検出電圧よりも、低くなるように設定されている
ことを特徴とする。
前記バッテリの正極側が前記第1の端子に接続され、前記バッテリの負極側が前記第2の端子に接続されるように、前記スイッチ装置と前記バッテリとは、前記第1の端子と前記第2の端子との間で直列に接続されている
ことを特徴とする。
前記検出用コンデンサの容量値は、前記保持用コンデンサの容量値よりも大きいことを特徴とする。
前記スイッチ装置が被水することにより、前記スイッチ装置がオフした状態で、前記スイッチ装置の前記電流経路にリーク電流が流れることを特徴とする。
前記LED駆動回路は、二輪車に積載され、
前記LEDランプは、前記二輪車のヘッドライト、又は、前記二輪車のウインカーであり、
前記スイッチ装置は、ユーザにより操作され且つ前記LEDランプの駆動を制御するための前記二輪車のハンドルスイッチである
ことを特徴とする。
前記第1の端子に接続され、前記第1の端子から入力された電流に基づいて、前記制御回路に電力を供給する電源回路をさらに備え、
前記電源回路は、前記スイッチ装置がオンした状態のとき、又は前記スイッチ装置がオフし且つ前記電流経路にリーク電流が流れた状態のとき、前記第1の端子から入力された電流で動作し且つ前記第1の端子から入力された電流に基づいて前記制御回路に電力を供給し、
前記制御回路は、前記電源回路から供給される電力で、動作するとともに前記LEDランプを駆動する
ことを特徴とする。
前記第1のスイッチ素子は、ソースが前記第1の端子に接続され、ドレインが前記検出用コンデンサの一端に接続され、前記制御回路によりゲート電圧が制御されるpMOSトランジスタである
ことを特徴とする。
なお、この図1に示す比較回路CCは、コンバータCOMPを用いて構成しているが、電圧を比較することが可能な他のトランジスタ等の回路を用いて構成するようにしてもよい。
さらに、制御回路CONは、プリドライブ回路PCにパルス信号を出力して、検出回路DCの第1のスイッチ素子Q1を周期的にスイッチングする。
次に、以上のような構成を有するLED駆動回路100の動作の一例について、図2、図3を用いて説明する。
以上のように、本発明の一態様に係るLED駆動回路は、機械式のスイッチ装置のオン/オフに応じて、LEDランプの駆動を制御するLED駆動回路であって、スイッチ装置の電流経路の一端側が接続される第1の端子と、スイッチ装置の電流経路の他端側が接続される第2の端子であって、第1の端子と第2の端子との間でスイッチ装置とバッテリとが直列に接続される、第2の端子と、第1の端子に流れる電流を周期的に検出し、この検出結果に応じた検出信号を第1ノードから出力する検出回路と、検出信号に応じた検出電圧と、閾値電圧と、を比較し、この比較結果に応じた比較結果信号を出力する比較回路と、検出回路の電流の検出動作を制御するとともに、比較結果信号に基づいて、LEDランプの駆動を制御する制御回路と、を備える。
Claims (15)
- 機械式のスイッチ装置のオン/オフに応じて、LEDランプの駆動を制御するLED駆動回路であって、
前記スイッチ装置の電流経路の一端側が接続される第1の端子と、
前記スイッチ装置の前記電流経路の他端側が接続される第2の端子であって、前記第1の端子と前記第2の端子との間で前記スイッチ装置とバッテリとが直列に接続される、前記第2の端子と、
前記第1の端子に流れる電流を周期的に検出し、この検出結果に応じた検出信号を第1ノードから出力する検出回路と、
前記検出信号に応じた検出電圧と、閾値電圧とを比較し、この比較結果に応じた比較結果信号を出力する比較回路と、
前記検出回路の電流の検出動作を制御するとともに、前記比較結果信号に基づいて、前記LEDランプの駆動を制御する制御回路と、を備え、
前記制御回路は、
前記比較結果信号が、前記検出電圧が前記閾値電圧以上であることを示す場合には、前記スイッチ装置がオンして前記電流経路の一端と他端との間が導通していると判断し、
一方、前記比較結果信号が、前記検出電圧が前記閾値電圧未満であることを示す場合には、前記スイッチ装置がオフして前記電流経路の一端と他端との間が遮断していると判断する
ことを特徴とするLED駆動回路。 - 前記検出回路は、
一端が前記第1の端子に接続され、前記制御回路によりオン又はオフに制御される第1のスイッチ素子と、
一端が前記第1のスイッチ素子の他端に接続され、他端が前記第1ノードに接続された検出用コンデンサと、
一端が前記第1ノードに接続され、他端が前記第2の端子に接続された検出用抵抗と、
前記第1のスイッチ素子の他端と前記第2の端子との間で、前記検出用抵抗および前記検出用コンデンサと並列に接続されるように、一端が前記第1のスイッチ素子の他端に接続され、他端が前記第2の端子に接続された放電用抵抗と、を備え、
前記制御回路は、
前記第1のスイッチ素子を周期的にオンとオフを切り換えるように制御し、
前記検出回路は、
前記第1ノードから前記検出信号を出力することを特徴とする請求項1に記載のLED駆動回路。 - 前記検出回路は、
前記第1のスイッチ素子の他端と前記第2の端子との間で、前記放電用抵抗と直列に接続された第2のスイッチ素子をさらに備え、
前記制御回路は、
前記第1のスイッチ素子をオンする場合は、前記第2のスイッチ素子をオフするように制御し、
また、前記第1のスイッチ素子をオフする場合は、前記第2のスイッチ素子をオンするように制御する
ことを特徴とする請求項2に記載のLED駆動回路。 - 前記検出信号のピーク電圧を保持し、この保持した前記ピーク電圧を前記検出電圧として第2ノードから出力するピークホールド回路をさらに備えることを特徴とする請求項2に記載のLED駆動回路。
- 前記ピークホールド回路は、
アノードが前記第1ノードに接続され、カソードが前記第2ノードに接続された保持用ダイオードと、
前記第2ノードと前記第2の端子との間に接続された保持用コンデンサと、を備えることを特徴とする請求項4に記載のLED駆動回路。 - 前記比較回路は、
前記第1の端子と前記第2の端子との間の電圧を分圧した分圧電圧を前記閾値電圧として出力する分圧回路と、
前記検出電圧と前記閾値電圧とが入力され、前記検出電圧と前記閾値電圧とを比較し、この比較結果に応じて前記比較結果信号を出力するコンパレータと、を備える
ことを特徴とする請求項5に記載のLED駆動回路。 - 前記分圧回路は、
一端が前記第1の端子に接続され、他端が分圧ノードに接続された第1の分圧抵抗と、
一端が前記分圧ノードに接続され、他端が第2の端子に接続された第2の分圧抵抗と、を備え、
前記分圧回路は、前記分圧ノードの電圧を前記閾値電圧として出力することを特徴とする請求項6に記載のLED駆動回路。 - 前記閾値電圧は、前記スイッチ装置がオフし且つ前記電流経路にリーク電流が流れている状態において、前記制御回路が前記第1のスイッチ素子を周期的にオンとオフを切り換えることで前記検出回路が出力する前記検出信号のピーク電圧である前記検出電圧よりも、高くなるように設定されている
ことを特徴とする請求項4に記載のLED駆動回路。 - 前記閾値電圧は、前記スイッチ装置がオンしている状態において、前記制御回路が前記第1のスイッチ素子を周期的にオンとオフを切り換えることで前記検出回路が出力する前記検出信号のピーク電圧である前記検出電圧よりも、低くなるように設定されている
ことを特徴とする請求項8に記載のLED駆動回路。 - 前記バッテリの正極側が前記第1の端子に接続され、前記バッテリの負極側が前記第2の端子に接続されるように、前記スイッチ装置と前記バッテリとは、前記第1の端子と前記第2の端子との間で直列に接続されている
ことを特徴とする請求項1に記載のLED駆動回路。 - 前記検出用コンデンサの容量値は、前記保持用コンデンサの容量値よりも大きいことを特徴とする請求項5に記載のLED駆動回路。
- 前記スイッチ装置が被水することにより、前記スイッチ装置がオフした状態で、前記スイッチ装置の前記電流経路にリーク電流が流れることを特徴とする請求項1に記載のLED駆動回路。
- 前記LED駆動回路は、二輪車に積載され、
前記LEDランプは、前記二輪車のヘッドライト、又は、前記二輪車のウインカーであり、
前記スイッチ装置は、ユーザにより操作され且つ前記LEDランプの駆動を制御するための前記二輪車のハンドルスイッチである
ことを特徴とする請求項1に記載のLED駆動回路。 - 前記第1の端子に接続され、前記第1の端子から入力された電流に基づいて、前記制御回路に電力を供給する電源回路をさらに備え、
前記電源回路は、前記スイッチ装置がオンした状態のとき、又は前記スイッチ装置がオフし且つ前記電流経路にリーク電流が流れた状態のとき、前記第1の端子から入力された電流で動作し且つ前記第1の端子から入力された電流に基づいて前記制御回路に電力を供給し、
前記制御回路は、前記電源回路から供給される電力で、動作するとともに前記LEDランプを駆動する
ことを特徴とする請求項2に記載のLED駆動回路。 - 前記第1のスイッチ素子は、ソースが前記第1の端子に接続され、ドレインが前記検出用コンデンサの一端に接続され、前記制御回路によりゲート電圧が制御されるpMOSトランジスタである
ことを特徴とする請求項2に記載のLED駆動回路。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003063305A (ja) | 2001-08-27 | 2003-03-05 | Honda Motor Co Ltd | 制動灯点灯回路 |
JP2012011970A (ja) * | 2010-07-05 | 2012-01-19 | Honda Motor Co Ltd | 鞍乗型車両の発光ダイオード点灯回路 |
JP2013033610A (ja) | 2011-08-01 | 2013-02-14 | Shindengen Electric Mfg Co Ltd | 駆動回路 |
JP2014040142A (ja) | 2012-08-21 | 2014-03-06 | Rohm Co Ltd | リーク電流検出回路、半導体装置、led照明装置、車両 |
JP2014531715A (ja) | 2011-09-22 | 2014-11-27 | タイコ・エレクトロニクス・コーポレイションTyco Electronics Corporation | スイッチアセンブリ及びスイッチシステム |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8982578B2 (en) | 2010-10-14 | 2015-03-17 | Tyco Electronics Corporation | Connector system and assembly having integrated protection circuitry |
WO2012132830A1 (ja) * | 2011-03-31 | 2012-10-04 | 本田技研工業株式会社 | 車両の灯火制御システム |
US20140145637A1 (en) * | 2012-11-26 | 2014-05-29 | Lucidity Lights, Inc. | Induction rf fluorescent light bulb with synchronized burst-mode dimming |
US9408261B2 (en) * | 2013-05-07 | 2016-08-02 | Power Integrations, Inc. | Dimmer detector for bleeder circuit activation |
-
2015
- 2015-02-23 CA CA2927030A patent/CA2927030C/en active Active
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003063305A (ja) | 2001-08-27 | 2003-03-05 | Honda Motor Co Ltd | 制動灯点灯回路 |
JP2012011970A (ja) * | 2010-07-05 | 2012-01-19 | Honda Motor Co Ltd | 鞍乗型車両の発光ダイオード点灯回路 |
JP2013033610A (ja) | 2011-08-01 | 2013-02-14 | Shindengen Electric Mfg Co Ltd | 駆動回路 |
JP2014531715A (ja) | 2011-09-22 | 2014-11-27 | タイコ・エレクトロニクス・コーポレイションTyco Electronics Corporation | スイッチアセンブリ及びスイッチシステム |
JP2014040142A (ja) | 2012-08-21 | 2014-03-06 | Rohm Co Ltd | リーク電流検出回路、半導体装置、led照明装置、車両 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019006192A (ja) * | 2017-06-22 | 2019-01-17 | 株式会社小糸製作所 | 車両用灯具 |
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EP3264864B1 (en) | 2019-06-12 |
CA2927030C (en) | 2017-11-07 |
CA2927030A1 (en) | 2016-08-23 |
US20160295650A1 (en) | 2016-10-06 |
JP6062602B1 (ja) | 2017-01-25 |
US9544958B2 (en) | 2017-01-10 |
JPWO2016135814A1 (ja) | 2017-04-27 |
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