WO2016075754A1 - Procédé de commande d'éclairage et appareil de commande d'éclairage - Google Patents

Procédé de commande d'éclairage et appareil de commande d'éclairage Download PDF

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Publication number
WO2016075754A1
WO2016075754A1 PCT/JP2014/079822 JP2014079822W WO2016075754A1 WO 2016075754 A1 WO2016075754 A1 WO 2016075754A1 JP 2014079822 W JP2014079822 W JP 2014079822W WO 2016075754 A1 WO2016075754 A1 WO 2016075754A1
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Prior art keywords
lamp
voltage
current
led lamp
constant
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PCT/JP2014/079822
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English (en)
Japanese (ja)
Inventor
安里 河村
高嶋　豊隆
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新電元工業株式会社
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Application filed by 新電元工業株式会社 filed Critical 新電元工業株式会社
Priority to JP2016558473A priority Critical patent/JP6387420B2/ja
Priority to PCT/JP2014/079822 priority patent/WO2016075754A1/fr
Publication of WO2016075754A1 publication Critical patent/WO2016075754A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof

Definitions

  • the present invention relates to a lighting control method and a lighting control device.
  • FIG. 5 is a diagram illustrating a configuration example of a lighting control device according to the related art.
  • the lighting control device shown in FIG. 5 includes a power supply circuit 11, an electrolytic capacitor 12, a switch 13, a current limiting circuit 14, and an LED lamp 15.
  • the current supplied from the power supply circuit 11 to the LED lamp 15 is limited to a constant value by the current limiting circuit 14. Thereby, the LED lamp 15 is turned on by so-called constant current control.
  • the constant current control when a circuit that forms a current path for supplying current from the power supply circuit 11 to the LED lamp 15 is in an open state, the current flowing through the LED lamp 15 needs to be kept constant.
  • the output voltage Vo of the circuit 11 increases. In this case, the output voltage Vo of the power supply circuit 11 may increase excessively and cause circuit destruction. For this reason, in this type of lighting control device, when the circuit forming the current path of the LED lamp 15 is in an open state, the output voltage Vo of the power supply circuit 11 is switched by switching from constant current control to constant voltage control. Is controlled to a constant value.
  • FIG. 6 is a diagram for supplementarily explaining the operation of the lighting control device according to the prior art.
  • the output voltage Vo (solid line vector) of the power supply circuit 11 at the time of constant current control and the constant voltage are controlled. It is a figure for demonstrating the relationship with the output voltage Vo (vector of a dotted line) of the power supply circuit 11 at the time of voltage control.
  • the output voltage Vo of the power supply circuit 11 at the time of constant current control indicated by a solid line vector is generally clamped to a voltage value VO2 depending on the forward voltage (Vf) of the LED lamp 15.
  • the output voltage Vo of the power supply circuit 11 at the time of constant voltage control indicated by the dotted line vector in FIG. 6 is set to a voltage value VO1 higher than the voltage value VO2 at the time of constant current control.
  • the voltage value VO1 is set to a value that does not cause circuit breakdown and does not inhibit constant current control.
  • the output voltage Vo of the power supply circuit 11 is clamped at the voltage value VO1 by switching from constant current control to constant voltage control. For this reason, circuit breakdown due to overvoltage is prevented. Further, even if the output voltage Vo is clamped at the voltage value VO1 during the constant voltage control, the constant current control is not hindered.
  • the voltage value VO1 of the output voltage Vo of the power supply circuit 11 in the constant voltage control may be lowered.
  • the difference between the voltage value VO1 and the voltage value VO2 decreases, and there is a possibility that the constant current control is hindered.
  • one embodiment of the present invention provides a rush current that flows through an LED lamp when a circuit that forms a current path for supplying current to the LED lamp changes from an open state to a closed state without inhibiting constant current control. It is an object of the present invention to provide a lighting control method and a lighting control device that can suppress the lighting.
  • a lighting control method for controlling lighting of a lamp of a vehicle, the first step of converting DC power into power to generate a voltage applied to the lamp, A second step of detecting a flowing current, and when the current flowing through the lamp exceeds a predetermined value, the voltage applied to the lamp is controlled so that the current flowing through the lamp is constant, and the lamp flows A third step of setting the voltage applied to the lamp to a voltage lower than the voltage applied to the lamp when the current flowing through the lamp exceeds the predetermined value when the current is less than or equal to the predetermined value.
  • a lighting control method including:
  • the voltage applied to the lamp exceeds the predetermined value.
  • a lighting control method is proposed in which the voltage is set lower than the upper limit value of the voltage applied to the lamp.
  • the lamp is formed of a light emitting diode, and the predetermined value is determined when a current flowing through the light emitting diode is a forward voltage (Vf) or less of a forward bias voltage of the light emitting diode.
  • Vf forward voltage
  • a lighting control method that is a threshold value for determining whether or not the current flows through the light emitting diode is proposed.
  • a lighting control method in which a current flowing through the lamp is detected using an npn transistor having a common emitter.
  • a lighting control device that controls lighting of a lamp of a vehicle, the power conversion unit configured to convert DC power into power and generate a voltage applied to the lamp, and the lamp.
  • a detection unit for detecting a flowing current, and a current flowing through the lamp by controlling a voltage applied to the lamp so that a current flowing through the lamp becomes constant when a current flowing through the lamp exceeds a predetermined value.
  • a voltage applied to the lamp is set to a voltage lower than the voltage applied to the lamp when the current flowing through the lamp exceeds the predetermined value, Has proposed a lighting control device equipped with.
  • FIG. 1 shows a configuration example of a lighting control device 100 that implements a lighting control method for an LED lamp LP according to a first embodiment of the present invention.
  • the LED lamp LP is a lighting device such as a vehicle headlamp.
  • the lighting control device 100 can control lighting of an arbitrary lamp without being limited to a vehicle lighting device.
  • the concept of the lighting control device includes all devices for lighting the lamp, and includes, for example, a power supply device, a power supply control device, a drive device, and a drive control device.
  • the lighting control device 100 includes connection terminals 101 to 104, a power conversion unit 110, and a control unit 120.
  • the connection terminal 101 is connected to the positive electrode of the power supply unit PS provided in the vehicle, and the connection terminal 102 is connected to the negative electrode of the power supply unit PS.
  • the power supply unit PS is a supply source of DC power for lighting the LED lamp LP, and may be, for example, a secondary battery such as a battery, and rectifies an AC output of a generator provided in the vehicle. It may be a capacitor charged with the obtained electric power.
  • the connection terminal 102 is grounded to the vehicle body BDY together with the negative electrode of the power supply unit PS.
  • connection terminal 103 is connected to one end (first end) of an operation switch SW for switching between turning on and off the LED lamp LP, and the other end (second end) of the operation switch SW is connected to the LED lamp LP. Connected to the anode.
  • the connection terminals 101 to 104 are elements for clarifying the boundaries between the components of the lighting control device 100 and other components, and may be omitted.
  • the LED lamp LP is composed of a plurality of LEDs connected in series. However, it is not limited to this example, The connection form of several LED which comprises LED lamp LP is arbitrary, and LED lamp LP may be comprised from one LED.
  • the cathode of the LED lamp LP is connected to one end (first end) of the shunt resistor RS, and the other end (second end) of the shunt resistor RS is grounded to the vehicle body through the connection terminal 102.
  • a connection point Ps between the LED lamp LP and the shunt resistor RS is connected to the connection terminal 104, and a voltage Vs at the connection point Ps is applied to the connection terminal 104.
  • the input unit of the power conversion unit 110 is connected to the connection terminal 101, and the output unit of the power conversion unit 110 is connected to the connection terminal 103.
  • the power converter 110 is a component for generating the output voltage Vout applied to the LED lamp LP.
  • the power conversion unit 110 converts the DC power input from the power supply unit PS through the connection terminal 101 to generate an output voltage Vout, and outputs the output voltage Vout through the connection terminal 103.
  • the power conversion unit 110 includes a switching power supply circuit.
  • the present invention is not limited to this example, and the power conversion unit 110 can be configured by an arbitrary circuit as long as the LED lamp LP can be driven by constant current control and constant voltage control.
  • the power supply terminal (TVCC) of the control unit 120 is connected to the positive power of the power supply unit PS through the connection terminal 101, and the ground terminal (TGND) of the control unit 120 is connected to the negative electrode (vehicle body BDY) of the power supply unit PS through the connection terminal 102. It is connected to the.
  • the control unit 120 includes an integrated circuit, and operates with a power supply voltage obtained by stepping down the DC power voltage Vps supplied from the power supply unit PS through the connection terminal 101.
  • the control unit 120 is for controlling the switching operation of the power conversion unit 110.
  • the control unit 120 monitors the output voltage Vout of the power conversion unit 110 and performs a constant voltage control, and a current Ip (hereinafter referred to as a lamp) that flows through the LED lamp LP. It has a function for monitoring the current Ip.) And performing constant current control.
  • the constant current control means control for keeping the lamp current Ip flowing through the LED lamp LP constant
  • the constant voltage control is for keeping the voltage applied to the LED lamp LP constant. Means control.
  • FIG. 2 is a diagram illustrating a detailed configuration example of the lighting control device 100 according to the first embodiment of the present invention, and is a diagram illustrating a configuration of the control unit 120.
  • the control unit 120 includes a constant voltage control unit 121, a constant current control unit 122, an output voltage detection unit 123, and a voltage setting unit 124.
  • the constant voltage control unit 121 monitors the output voltage Vout of the power conversion unit 110 detected by the output voltage detection unit 123, and maintains the output voltage Vout at the constant voltage set value VTG that is the target voltage. It is a component that implements voltage control.
  • the constant voltage control unit 121 performs constant voltage control to cause the voltage applied to the LED lamp LP to flow through the LED lamp LP.
  • the current exceeds a predetermined current threshold ITH, the voltage is set lower than the voltage applied to the LED lamp LP.
  • the lamp current Ip is detected using a current detection function of the voltage setting unit 124 described later.
  • the constant voltage controller 121 includes a comparator 121A and a reference voltage generator 121B.
  • the comparator 121A compares the voltage Va at the connection point Pa between the resistor 123A and the resistor 123B constituting the output voltage detector 123 with the reference voltage Vref of the reference voltage generator 121B, and compares the voltage Va and the reference voltage Vref. This is a component for outputting a difference signal representing the difference between the two.
  • the constant voltage control unit 121 controls the switching operation of the power conversion unit 110 so that the difference between the voltage Va represented by the difference signal output from the comparator 121A and the reference voltage Vref converges to zero, thereby outputting the output voltage Vout. Is maintained at the constant voltage set value VTG.
  • the constant current control unit 122 monitors the lamp current Ip indicated by the voltage Vs (FIG. 1) of the connection point Ps input through the connection terminal 104, and maintains the lamp current Ip at the target current, thereby maintaining the lamp current Ip. It is a component that implements constant current control.
  • the constant current control unit 122 performs constant current control so that the current flowing through the LED lamp LP becomes constant. The voltage applied to the is controlled.
  • the lamp current Ip is detected from the voltage Vs at the connection point Ps indicating the voltage drop at the shunt resistor RS.
  • the target current of the lamp current Ip can be arbitrarily set according to the specifications of the LED lamp LP.
  • the output voltage detection unit 123 outputs the voltage Va at the connection point Pa obtained by dividing the output voltage Vout according to the resistance ratio between the resistor 123A and the resistor 123B as a detection result of the output voltage Vout during constant voltage control.
  • a component of The output voltage detection unit 123 includes resistors 123A and 123B.
  • One end (first end) of the resistor 123A is connected to the output unit of the power converter 110, the other end (second end) of the resistor 123A is connected to one end (first end) of the resistor 123B, and the other end of the resistor 123B.
  • the (second end) is grounded through the connection terminal 102 to the vehicle body BDY.
  • the voltage Va at the connection point Pa between the resistor 123A and the resistor 123B is input to the constant voltage control unit 121 as a voltage signal indicating the voltage level of the output voltage Vout.
  • the resistance ratio between the resistor 123A and the resistor 123B is such that the constant voltage setting value VTG at the time of constant voltage control is equal to the output voltage Vout at the time of constant current control (or the upper limit value of the output voltage Vout at the time of constant current control). ) Is set to be a lower voltage value VOL.
  • the resistor 124A is electrically connected in parallel with the resistor 123B of the output voltage detecting unit 123.
  • the resistor 123B and the resistor 124A form a combined resistor, and the resistance ratio between the resistor 123A and the combined resistor is such that the constant voltage set value VTG at the time of constant voltage control is higher than the output voltage Vout at the time of constant current control.
  • the voltage value VOH is set.
  • the output voltage Vout is clamped by the forward voltage (Vf) of the LED lamp LP.
  • the forward voltage (Vf) of the LED lamp LP is obtained.
  • the voltage value VOL is roughly set to a voltage equal to or lower than the forward voltage (Vf) of the LED lamp LP.
  • the forward voltage (Vf) of the LED lamp LP is the sum of the forward voltages (Vf) of the plurality of LEDs connected in series.
  • the voltage value VOH can be set to any value as long as it does not interfere with the output voltage Vout during constant current control and does not cause circuit breakdown due to overvoltage.
  • the voltage setting unit 124 is a component for setting a constant voltage setting value VTG that is a target value of the output voltage Vout during constant voltage control.
  • the voltage setting unit 124 also has a current detection function as a detection unit that detects a weak lamp current Ip flowing through the LED lamp LP.
  • the voltage setting unit 124 includes a resistor 124A, a resistor 124B, and a grounded npn transistor 124C.
  • One end (first end) of the resistor 124A is connected to a connection point Pa between the resistors 123A and 123B, and the other end (second end) of the resistor 124A is connected to the collector of the npn transistor 124C. .
  • the emitter of the npn transistor 124C is grounded to the vehicle body BDY through the connection terminal 102.
  • One end (first end) of the resistor 124B is connected to the connection terminal 104, and the other end (second end) of the resistor 124B is connected to the base of the npn transistor 124C.
  • the voltage setting unit 124 sets a constant voltage that is a target value of the output voltage Vout depending on whether or not the lamp current Ip input as the current Ib through the connection terminal 104 is equal to or less than a predetermined current threshold ITH (predetermined value). Switch the value VTG.
  • the voltage setting unit 124 switches the constant voltage set value VTG by switching the resistance ratio of the output voltage detection unit 123. Specifically, the voltage setting unit 124 apparently switches the resistance ratio of the output voltage detecting unit 123 by turning on the npn transistor 124C and connecting the resistor 124A in parallel with the resistor 123B of the output voltage detecting unit 123. .
  • the predetermined current threshold ITH is a threshold for determining a weak current flowing through the LED lamp LP when the forward bias voltage of the LED lamp LP is set to a forward voltage (Vf) or less.
  • current path of the LED lamp LP When a circuit that forms a current path for supplying current to the LED lamp LP from the power supply unit PS through the lighting control device 100 (hereinafter referred to as “current path of the LED lamp LP”) is in an open state, the LED lamp LP Since the forward bias voltage of the LED lamp LP is equal to or lower than the forward voltage (Vf) of the LED lamp LP, the current threshold ITH is, in other words, the circuit forming the current path of the LED lamp LP is in an open state or a closed state. This is a reference value for determining whether there is any.
  • the current path of the LED lamp LP is not limited to the above example, and may be arbitrarily defined as long as it is a path that can cause a factor that inhibits the current flowing through the LED lamp LP.
  • the circuit that forms the current path of the LED lamp LP indicates all the components until the current flowing out from the positive electrode of the power supply unit PS reaches the negative electrode of the power supply unit PS via the LED lamp LP.
  • 1 includes, for example, a power supply unit PS, a connection terminal 101, a power conversion unit 110, a connection terminal 103, an operation switch SW, an LED lamp LP, a shunt resistor RS, a connection terminal 102, and a wiring (no reference numeral).
  • the open state indicates a state in which the resistance value of the circuit forming the current path of the LED lamp LP has increased to such an extent that the lamp current Ip required for maintaining the lighting state of the LED lamp LP cannot be obtained.
  • the definition of the open state is arbitrary as long as it means a state in which the lighting state of the LED lamp LP cannot be maintained in a desired lighting state.
  • An example of the open state is a state where the operation switch SW is opened, that is, a state where the resistance value of the operation switch SW is infinite. Another example is a state in which the resistance value of the operation switch SW has increased due to poor contact of the operation switch SW.
  • a cable connector (not shown) that electrically connects the positive electrode of the power supply unit PS and the connection terminal 101 is loosened, and the positive electrode of the power supply unit PS and the connection terminal 101 are not connected. The electrical connection between them is no longer maintained.
  • the constant voltage control unit 121 described above functions in principle when the lamp current Ip flowing through the LED lamp LP is equal to or less than a predetermined current threshold ITH. However, the constant voltage control unit 121 exceptionally functions even when the output voltage Vout reaches the constant voltage set value VTG even when the current Ip flowing through the LED lamp LP exceeds a predetermined current threshold ITH. To do. In this case, the constant voltage control unit 121 functions as a kind of voltage limiter in which the upper limit of the output voltage Vout is the constant voltage set value VTG. On the other hand, the constant current control unit 122 functions only when the current Ip flowing through the LED lamp LP exceeds a predetermined current threshold ITH. If the circuit withstand voltage against overvoltage is sufficiently high, the function of the constant voltage control unit 121 as the voltage limiter described above can be omitted.
  • FIG. 3 is a diagram for explaining a constant voltage set value set during constant voltage control in the lighting control device 100 according to the first embodiment of the present invention.
  • the constant voltage control unit 121 includes a case where the lamp current Ip flowing through the LED lamp LP is equal to or less than a predetermined current threshold ITH and a case where the current Ip flowing through the LED lamp LP exceeds a predetermined current threshold ITH.
  • the constant voltage set value VTG is switched. Therefore, the constant voltage set value VTG when the lamp current Ip is equal to or less than the predetermined current threshold ITH and the constant voltage set value VTG when the lamp current Ip exceeds the predetermined current threshold ITH are different from each other.
  • the constant voltage control unit 121 sets the constant voltage setting value VTG of the output voltage Vout of the power conversion unit 110 as a dotted line in FIG. Is set to a voltage value VOL (a voltage value indicated by a solid line vector in FIG. 3) lower than the output voltage Vout at the time of constant current control (or the upper limit value of the output voltage Vout at the time of constant current control).
  • the voltage value VOL can be set to an arbitrary value as long as the rush current flowing into the LED lamp LP when the circuit is closed is suppressed.
  • the constant voltage control unit 121 uses the constant voltage set value VTG of the output voltage Vout of the power conversion unit 110 as the output voltage at the time of constant current control. It is set to a voltage value VOH (voltage value indicated by a dashed line vector in FIG. 3) higher than Vout (voltage value indicated by a dotted line vector in FIG. 3).
  • the lighting control device 100 sets the constant voltage set value VTG to either the voltage value VOL or the voltage value VOH according to the lamp current Ip flowing through the LED lamp LP.
  • the lighting control device 100 uses the constant voltage set value VTG as the output voltage Vout during constant current control (or during constant current control) when the lamp current Ip is equal to or less than a predetermined current threshold ITH.
  • the voltage value VOL lower than the upper limit value of the output voltage Vout
  • the operation of the lighting control device 100 shown as the lighting control method according to the first embodiment includes the following first to third stages.
  • the power conversion unit 110 of the lighting control device 100 converts the direct current power of the power supply unit PS provided in the vehicle under the control of the control unit 120 to convert the voltage applied to the LED lamp LP. generate. Details of the control of the control unit 120 will be described later.
  • the voltage setting unit 124 of the control unit 120 detects the lamp current Ip flowing through the LED lamp LP by its current detection function.
  • the voltage setting unit 124 sets the constant voltage setting value VTG to the voltage value VOL if the lamp current Ip is equal to or less than the predetermined current threshold ITH. Details thereof will be described later.
  • the control unit 120 is a target value of the output voltage Vout (that is, the applied voltage of the LED lamp) according to whether or not the lamp current Ip flowing through the LED lamp LP is equal to or less than a predetermined current threshold ITH.
  • the constant voltage set value VTG is switched to either the voltage value VOL or the voltage value VOH.
  • the control unit 120 determines that the lamp current Ip is constant when the lamp current Ip flowing through the LED lamp LP exceeds a predetermined current threshold ITH.
  • the voltage applied to the lamp LP is controlled. When the lamp current Ip is equal to or less than the current threshold ITH, the voltage applied to the LED lamp LP is applied to the LED lamp LP when the lamp current Ip exceeds the current threshold ITH.
  • the operation of the lighting control device 100 will be described in detail, focusing on the operation related to the third stage.
  • the operation of the lighting control device 100 will be described separately for the case where the lamp current Ip exceeds a predetermined current threshold ITH in the initial state before the circuit forming the LP current path is in the open state.
  • each component of the control unit 120 receives the low level voltage Vs indicating that the lamp current Ip is equal to or lower than the predetermined current threshold ITH, and performs the operation for constant voltage control as follows. carry out.
  • the voltage setting unit 124 of the control unit 120 receives the low level voltage Vs from the connection point Ps through the connection terminal 104. In this case, since the current Ib flowing into the base of the npn transistor 124C of the voltage setting unit 124 is not generated, the npn transistor 124C is turned off. For this reason, no current flows through the resistor 124A.
  • the constant voltage set value VTG is set to a voltage value VOL that is determined by the resistance ratio between the resistor 123A and the resistor 123B.
  • the voltage setting unit 124 uses the output voltage Vout (or constant current control) at the time of constant current control when the lamp current Ip exceeds a predetermined current threshold ITH as the output voltage Vout that is the voltage applied to the LED lamp LP. This means that the voltage value VOL is set lower than the upper limit value of the output voltage Vout at the time.
  • the output voltage detection unit 123 divides the output voltage Vout according to the resistance ratio between the resistor 123A and the resistor 123B and generates the voltage Va at the connection point Pa.
  • the constant voltage control unit 121 receives the voltage Va at the connection point Pa, and feedback-controls the switching operation of the power conversion unit 110 so that the output voltage Vout converges to the voltage value VOL set as the constant voltage set value.
  • the control unit 120 sets the output voltage Vout, which is the applied voltage of the LED lamp LP, to the output voltage Vout when the lamp current Ip exceeds the predetermined current threshold ITH (or the upper limit of the output voltage Vout during constant current control).
  • Voltage value VOL lower than (value). In other words, the voltage applied to the LED lamp LP is set to a voltage value VOL that is lower than the forward voltage (Vf) of the LED lamp LP.
  • the output voltage Vout of the lighting control device 100 changes to the LED lamp LP through the operation switch SW.
  • the output voltage Vout applied to the LED lamp LP when the operation switch SW is closed is set to a voltage value VOL lower than the forward voltage (Vf) of the LED lamp LP
  • the LED lamp LP Almost no current flows into. That is, the rush current generated when the circuit forming the current path of the LED lamp LP changes from the open state to the closed state is suppressed. Accordingly, no overvoltage occurs and the LED lamp LP is not damaged.
  • the control unit 120 changes the control method from constant voltage control by the constant voltage control unit 121 to constant current by the constant current control unit 122. Switch to control. Based on the voltage Vs at the connection point Ps, the constant current control unit 122 outputs by controlling the switching operation of the power conversion unit 110 so that the lamp current Ip represented by the voltage Vs converges to a constant target current value. The voltage Vout is adjusted. Accordingly, the lighting control device 100 according to the first embodiment drives the LED lamp LP by constant current control, and lights the LED lamp LP with a desired brightness.
  • the lamp current Ip increases and exceeds a predetermined current threshold ITH.
  • the lamp current Ip flows through the resistor 124B as the current Ib into the base of the npn transistor 124C of the voltage setting unit 124.
  • the npn transistor 124C is turned on. That is, the npn-type transistor 124C with common emitter detects the weak current Ib and turns on.
  • the resistor 124A is connected in parallel with the resistor 123B of the output voltage detector 123.
  • the resistance value of the resistor 123B apparently decreases.
  • the resistance ratio of the output voltage detection unit 123 is switched, and the constant voltage set value VTG that is the target value of the output voltage Vout is set to the voltage value VOH.
  • the lamp current Ip is a weak current.
  • the weak current Ib is detected using the current amplification action of the npn transistor 124C.
  • a diode having a forward voltage (Vf) corresponding to the emitter-base voltage Vbe of the npn transistor 124C is used if necessary. You may connect in series with RS. This suppresses the influence of the emitter-base voltage Vbe of the npn transistor 124C on the detection of the weak current Ib as a result of the voltage Vs at the connection point Ps being increased by the forward voltage (Vf) of the diode. it can.
  • the state where the LED lamp LP is lit by constant current control as described above is set as an initial state, for example, Consider a case where a contact failure of the operation switch SW occurs due to mechanical vibration, and the circuit forming the current path of the LED lamp LP temporarily changes from the closed state to the open state.
  • the open state is assumed to be a state where the conduction resistance of the circuit forming the current path of the LED lamp LP is increased due to an abnormality such as a contact failure of the operation switch SW.
  • the lamp current Ip of the LED lamp LP decreases. Even if the lamp current Ip decreases, if the lamp current Ip exceeds the predetermined current threshold ITH, the constant current control unit 122 outputs so as to maintain the lamp current Ip at a constant target current value in the constant current control. The decrease in the lamp current Ip is compensated by increasing the voltage Vout from the normal voltage value. Thereby, even if there is a contact failure of the operation switch SW, the lighting state of the LED lamp LP can be maintained.
  • the control unit 120 switches the control method from constant current control by the constant current control unit 122 to constant voltage control by the constant voltage control unit 121.
  • the voltage setting unit 124 since the lamp current Ip exceeds the predetermined current threshold value ITH, the voltage setting unit 124 apparently switches the resistance ratio of the output voltage detection unit 123, and the constant voltage setting value VTG is the voltage value VOH. Is set to
  • the constant voltage control unit 121 feedback-controls the switching operation of the power conversion unit 110 so that the output voltage Vout is maintained at the constant voltage setting value VTG of the voltage value VOH.
  • the control unit 120 converts the output voltage Vout, which is the applied voltage of the LED lamp LP, to the lamp current.
  • the voltage value VOH is set higher than the output voltage Vout when Ip exceeds a predetermined current threshold ITH. For this reason, even if the output voltage Vout is increased in the constant current control when a contact failure of the operation switch SW occurs, the output voltage Vout is clamped at the constant voltage set value VTG of the voltage value VOH. Therefore, even if the output voltage Vout rises due to poor contact of the operation switch SW during constant current control, overvoltage does not occur, and circuit breakdown due to overvoltage can be prevented.
  • the lamp current Ip decreases if the decrease in the lamp current Ip cannot be compensated.
  • the resistance ratio of the output voltage detection unit 123 is restored by the voltage setting unit 124, and the constant voltage setting value VTG is set to the voltage value VOL. Is done.
  • the output voltage detection unit 123 divides the output voltage Vout according to the resistance ratio between the resistor 123A and the resistor 123B to generate the voltage Va at the connection point Pa.
  • the constant voltage control unit 121 receives the voltage Va at the connection point Pa, and generates a voltage indicated by the voltage value VOL as the output voltage Vout that is an applied voltage of the LED lamp LP.
  • the control unit 120 uses the output voltage Vout, which is the voltage applied to the LED lamp LP, as the output voltage Vout during constant current control when the lamp current Ip exceeds a predetermined current threshold ITH (or during constant current control).
  • the voltage value VOL is set lower than the upper limit value of the output voltage Vout.
  • the output voltage of the lighting control device 100 Vout is applied to the LED lamp LP through the operation switch SW.
  • the output voltage Vout applied to the LED lamp LP is set to a voltage value VOL lower than the forward voltage (Vf) of the LED lamp LP, almost no current flows into the LED lamp LP. That is, the rush current when the output voltage Vout is applied to the LED lamp LP is suppressed. Therefore, as in the case where the operation switch SW is closed, no overvoltage is generated and the LED lamp LP is not damaged.
  • the following effects can be obtained.
  • the target of the output voltage Vout applied to the LED lamp LP is set to a constant voltage set value VTG having a voltage value VOL lower than the output voltage Vout at the time of constant current control (or the upper limit value of the output voltage Vout at the time of constant current control). For this reason, since the voltage applied to LED lamp LP falls when the circuit which forms the current path of LED lamp LP changes from an open state to a closed state, the rush current which flows into LED lamp LP can be suppressed. .
  • the lamp current Ip flowing through the LED lamp LP exceeds a predetermined current threshold ITH, that is, when the circuit forming the current path of the LED lamp LP is in a closed state, the lamp current Ip flowing through the LED lamp LP is Since the output current Iout as the lamp current Ip is limited so as to be constant, the LED lamp LP can be turned on by constant current control.
  • the first embodiment it is possible to suppress the rush current that flows through the lamp when the circuit that forms the current path of the LED lamp LP changes from the open state to the closed state without inhibiting constant current control. it can.
  • the lamp current Ip flowing through the LED lamp LP exceeds a predetermined current threshold ITH, the conduction resistance of the circuit that forms the current path of the LED lamp LP, for example, due to poor contact or the like. Even if increases, the constant current control can be continued and the lighting of the LED lamp can be maintained.
  • FIG. 4 is a diagram illustrating a detailed configuration example of the lighting control device 200 according to the second embodiment of the present invention.
  • the lighting control device 200 includes a control unit 220 instead of the control unit 120 shown in FIGS. 1 and 2 according to the first embodiment described above.
  • the control unit 220 includes a current detection unit 224 in place of the voltage setting unit 124 in the configuration of the control unit 120 shown in FIGS. 1 and 2 according to the first embodiment described above.
  • the current detection unit 224 has a configuration in which one end (first end) of the resistor 124A is connected to a power source in the configuration of the voltage setting unit 124 according to the first embodiment described above.
  • a voltage V224 at a connection point between the resistor 124A and the collector of the npn transistor 124C is supplied to each of the constant voltage control unit 121 and the constant current control unit 122.
  • the constant voltage control unit 121 functions when the voltage V224 output from the current detection unit 224 is at a high level
  • the constant current control unit 122 uses the voltage V224 output from the current detection unit 224. Works at low level. Others are the same as in the first embodiment.
  • the lighting control method performed by the lighting control device 200 according to the second embodiment is based on whether the lamp current Ip flowing through the LED lamp LP is equal to or lower than a predetermined current threshold ITH.
  • Either 121 or the constant current control unit 122 functions.
  • the control unit 120 When the lamp current Ip is less than or equal to the predetermined current threshold ITH, the control unit 120 performs constant voltage control as follows. When the lamp current Ip is equal to or less than the predetermined current threshold ITH, a low level is supplied as the voltage Vs from the connection point Ps to the input unit of the current detection unit 224 of the control unit 120 through the connection terminal 104. In this case, since there is no current Ib flowing into the base of the npn transistor 124C of the current detector 224, the npn transistor 124C is turned off.
  • the voltage V224 at the connection point between the resistor 124A and the collector of the npn transistor 124C is pulled up to the high level by the resistor 124A, and the high level voltage V224 is supplied to the constant voltage control unit 121 and the constant current control unit 122. Is done. As a result, the function of the constant voltage control unit 121 is activated and the function of the constant current control unit 122 is deactivated.
  • the activated constant voltage control unit 121 receives the voltage Va at the connection point Pa obtained by dividing the output voltage Vout according to the resistance ratio between the resistor 123A and the resistor 123B of the output voltage detection unit 123, and receives the output voltage Vout. Feedback-controls the switching operation of the power converter 110 so that the voltage converges to the constant voltage setting value VTG of the voltage value VOL.
  • the control unit 120 sets the output voltage Vout, which is the applied voltage of the LED lamp LP, to the output voltage Vout when the lamp current Ip exceeds the predetermined current threshold ITH (or the upper limit of the output voltage Vout during constant current control).
  • Voltage value VOL lower than (value). In other words, the voltage applied to the LED lamp LP is set to a voltage value VOL that is lower than the forward voltage (Vf) of the LED lamp LP.
  • the output voltage Vout of the lighting control device 100 is applied to the LED lamp LP.
  • the output voltage Vout applied to the LED lamp LP when the operation switch SW is closed is set to a voltage value VOL lower than the forward voltage (Vf) of the LED lamp LP, the LED lamp LP Almost no current flows into. That is, the rush current when the output voltage Vout is applied to the LED lamp LP is suppressed. Therefore, no overvoltage occurs and the LED lamp LP is not damaged.
  • a weak lamp current Ip corresponding to the voltage value VOL flows through the LED lamp LP.
  • the lamp current Ip of the LED lamp LP exceeds a predetermined current threshold value ITH
  • the current Ib flows into the base of the npn transistor 124C of the current detector 224, and the npn transistor 124C is turned on.
  • the voltage V224 is lowered to the low level, and the low level voltage V224 is supplied to the constant voltage control unit 121 and the constant current control unit 122.
  • the function of the constant current control unit 122 is activated and the function of the constant voltage control unit 121 is deactivated.
  • the activated constant current control unit 122 performs feedback control of the switching operation of the power conversion unit 110 so that the lamp current Ip converges to a constant target current value.
  • the control part 120 drives LED lamp LP by constant current control, and makes LED lamp LP light with desired brightness.
  • the state where the LED lamp LP is lit by constant current control as described above is set as an initial state, for example, Consider a case where an abnormality such as a contact failure of the operation switch SW occurs due to mechanical vibration, and the circuit forming the current path of the LED lamp LP temporarily changes from a closed state to an open state (a state in which the conduction resistance is increased).
  • the lamp current Ip of the LED lamp LP decreases.
  • the constant current control unit 122 maintains the output voltage Vout at a normal time so as to maintain the lamp current Ip at a constant target current value.
  • the amount of decrease in the lamp current Ip is compensated by raising the voltage value above the constant current control.
  • the constant voltage set value VTG is not set to the voltage value VOH, and the constant voltage set value VTG is fixed to the voltage value VOL. That is, in the second embodiment, when the lamp current Ip exceeds the predetermined current threshold ITH, only the constant current control by the constant current control unit 122 is performed, and the upper limit of the output voltage Vout is the output voltage Vout in the constant current control. Determined by the maximum value of.
  • the lamp current Ip decreases and becomes equal to or less than a predetermined current threshold ITH.
  • a low level is supplied as the voltage Vs to the input unit of the current detection unit 224 of the control unit 120, and the npn transistor 124C is turned off. Therefore, the voltage V224 is pulled up to a high level by the resistor 124A, and the high level voltage V224 is supplied to the constant voltage control unit 121 and the constant current control unit 122.
  • the function of the constant voltage control unit 121 is activated and the function of the constant current control unit 122 is deactivated.
  • the activated constant voltage control unit 121 receives the voltage Va at the connection point Pa obtained by dividing the output voltage Vout according to the resistance ratio between the resistor 123A and the resistor 123B of the output voltage detection unit 123, and receives the output voltage Vout. Feedback-controls the switching operation of the power converter 110 so that the voltage converges to the constant voltage setting value VTG of the voltage value VOL.
  • the control unit 120 uses the output voltage Vout, which is the voltage applied to the LED lamp LP, as the output voltage Vout during constant current control when the lamp current Ip exceeds a predetermined current threshold ITH (or during constant current control).
  • the voltage value VOL is set lower than the upper limit value of the output voltage Vout. In other words, the voltage applied to the LED lamp LP is set to a voltage value VOL that is lower than the forward voltage (Vf) of the LED lamp LP.
  • the output voltage of the lighting control device 100 Vout is applied to the LED lamp LP through the operation switch SW.
  • the output voltage Vout applied to the LED lamp LP is set to a voltage value VOL lower than the forward voltage (Vf) of the LED lamp LP, almost no current flows into the LED lamp LP. That is, the rush current when the output voltage Vout is applied to the LED lamp LP is suppressed. Accordingly, as in the case where the operation switch SW is closed, no overvoltage is generated and the LED lamp LP is not damaged.
  • the voltage applied to the LED lamp LP decreases when the circuit that forms the current path of the LED lamp LP changes from the open state to the closed state. Can be suppressed. Further, according to the second embodiment, when the circuit forming the current path of the LED lamp LP is in the closed state, the output current Iout that becomes the lamp current Ip so that the lamp current Ip flowing through the LED lamp LP is constant. Therefore, the lighting of the LED lamp LP can be continued by constant current control.
  • the apparent resistance ratio between the resistor 123A and the resistor 123B of the output voltage detector 123 is switched according to the conduction state (ON / OFF) of the npn transistor 124C of the voltage setting unit 124.
  • the constant voltage set value VTG is switched, but the value of the reference voltage Vref of the reference voltage generator 121B supplied to the comparator 121A of the constant voltage controller 121 may be switched. For example, if the reference voltage Vref when the constant voltage setting value VTG of the output voltage Vout is set to the voltage value VOL is lower than the reference voltage Vref when the constant voltage setting value VTG of the output voltage Vout is set to the voltage value VOH, Good.
  • the switching of the reference voltage Vref is performed based on the voltage V224 output from the current detection unit 224 of the second embodiment described above, for example.
  • the lamp current Ip becomes equal to or lower than the predetermined current threshold ITH, and the voltage V224 becomes high level. Therefore, if the reference voltage Vref is lowered when the voltage V224 is at a high level, the constant voltage setting value VTG of the output voltage Vout can be set to a low voltage value VOL. If the circuit forming the current path of the LED lamp LP is in the closed state, the lamp current Ip exceeds the predetermined current threshold ITH, and the voltage V224 becomes low level.
  • the constant voltage setting value VTG of the output voltage Vout can be set to a high voltage value VOH.
  • Others are the same as those in the first embodiment or the second embodiment. According to this modification, since it is not necessary to provide the resistor 124A (see FIG. 2) of the voltage setting unit 124 for dividing the output voltage Vout that becomes a high voltage, the apparatus can be miniaturized.
  • the output voltage Vout of the lighting control device 100 is generated from the DC power of the power supply unit PS.
  • the output voltage Vout is not limited to the DC power of the power supply unit PS and is output from any power supply including an AC power supply. It is also possible to configure the lighting control device 100 so as to generate the voltage Vout. The same applies to the second embodiment.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

L'invention concerne un procédé de commande d'éclairage et un appareil de commande d'éclairage, grâce à quoi, sans perturber une commande de courant constant, un courant d'appel circulant dans une lampe à DEL peut être supprimé lorsqu'un circuit formant un trajet de courant de la lampe à DEL est amené dans un état fermé à partir d'un état ouvert. Selon un mode de réalisation de la présente invention, dans une première étape du procédé de commande de l'éclairage, la puissance en courant continu est soumise à une conversion de puissance, et une tension à appliquer à une lampe est générée. Dans une deuxième étape, un courant circulant dans la lampe est détecté. Dans une troisième étape, dans les cas où le courant circulant dans la lampe dépasse une valeur prédéfinie, une tension à appliquer à la lampe est commandée de sorte que le courant circulant dans la lampe soit constant, et dans les cas où le courant circulant dans la lampe est inférieur ou égal à la valeur prédéfinie, la tension à appliquer à la lampe est réglée à un niveau inférieur à la tension à appliquer à la lampe dans les cas où le courant circulant dans la lampe dépasse la valeur prédéfinie.
PCT/JP2014/079822 2014-11-11 2014-11-11 Procédé de commande d'éclairage et appareil de commande d'éclairage WO2016075754A1 (fr)

Priority Applications (2)

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JP2016558473A JP6387420B2 (ja) 2014-11-11 2014-11-11 点灯制御方法および点灯制御装置
PCT/JP2014/079822 WO2016075754A1 (fr) 2014-11-11 2014-11-11 Procédé de commande d'éclairage et appareil de commande d'éclairage

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN112385318A (zh) * 2018-06-07 2021-02-19 昕诺飞控股有限公司 Led驱动器以及与该驱动器一起使用的led模块

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006086413A (ja) * 2004-09-17 2006-03-30 Koito Mfg Co Ltd 車両用灯具の点灯制御回路
JP2006210271A (ja) * 2005-01-31 2006-08-10 Matsushita Electric Works Ltd Ｌｅｄ駆動装置、及びそれを用いた照明装置
JP2011098620A (ja) * 2009-11-05 2011-05-19 Stanley Electric Co Ltd 車両用灯具

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Publication number Priority date Publication date Assignee Title
JP5783751B2 (ja) * 2011-02-15 2015-09-24 ミネベア株式会社 Ｌｅｄ駆動装置

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Publication number Priority date Publication date Assignee Title
JP2006086413A (ja) * 2004-09-17 2006-03-30 Koito Mfg Co Ltd 車両用灯具の点灯制御回路
JP2006210271A (ja) * 2005-01-31 2006-08-10 Matsushita Electric Works Ltd Ｌｅｄ駆動装置、及びそれを用いた照明装置
JP2011098620A (ja) * 2009-11-05 2011-05-19 Stanley Electric Co Ltd 車両用灯具

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112385318A (zh) * 2018-06-07 2021-02-19 昕诺飞控股有限公司 Led驱动器以及与该驱动器一起使用的led模块
JP2021525971A (ja) * 2018-06-07 2021-09-27 シグニファイ ホールディング ビー ヴィＳｉｇｎｉｆｙ Ｈｏｌｄｉｎｇ Ｂ．Ｖ． Ｌｅｄドライバ及び前記ドライバと共に使用するためのｌｅｄモジュール

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