JP2008311248A - Power supply device, light emitting diode lighting device, and guide light device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make currents flowing to three or more load currents nearly uniform with simple constitution while suppressing unnecessary power consumption. <P>SOLUTION: A current mirror circuit 110 has four transistors Q11 to Q22. The transistors Q11 to Q22 each have emitters and collectors connected to each other in series with LED circuits 210 to 240 (load circuits). Base terminals of the transistors Q11 to Q22 are connected to one another through wiring b<SB>0</SB>(common input terminal portion). The wiring b<SB>0</SB>and the collector terminal of the transistor Q11 are connected together through wiring (first input connection portion 111). The wiring b<SB>0</SB>and the collector terminal of the transistor Q21 are connected together through a diode D25 (second input connection portion 112). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply device that equalizes current flowing in three or more load circuits.

A current mirror circuit is known as a circuit for equalizing currents flowing through a plurality of load circuits.
There are two types of current mirror circuits, one that obtains a reference current from the outside and one that obtains one of the load circuits.
Japanese Utility Model Publication No. 7-39120 JP 2003-152224 A JP 2004-39684 A JP 2006-286339 A

A current mirror circuit that obtains a reference current from the outside requires a circuit for generating the reference current. In addition, power is consumed to generate the reference current. Therefore, the configuration becomes complicated, and wasteful power that is not used for driving the load is consumed.
A current mirror circuit that obtains a reference current from one of the load circuits is advantageous in that there is no need for a circuit for generating a reference current and there is no wasteful power consumption, but there is an abnormality in the load circuit through which the reference current flows. When this occurs, other load circuits cannot be driven.
The present invention has been made, for example, in order to solve the above-described problems, and has an object to suppress wasteful power consumption and make currents flowing through three or more load circuits substantially uniform with a simple configuration. And

The power supply device according to the present invention is
DC voltage is supplied to the first load circuit, the second load circuit, and the third load circuit, the current flowing through the first load circuit, the current flowing through the second load circuit, and the third load In the power supply device that makes the current flowing through the circuit substantially uniform,
A first transistor element;
A second transistor element;
A third transistor element;
A first load connection for connecting a collector terminal or drain terminal of the first transistor element to the first load circuit;
A second load connection for connecting the collector terminal or drain terminal of the second transistor element to the second load circuit;
A third load connection for connecting the collector terminal or drain terminal of the third transistor element to the third load circuit;
A common input connection for connecting base terminals or gate terminals of the first transistor element, the second transistor element, and the third transistor element to each other;
A first input connection for connecting the first load connection and the common input connection;
It has the 2nd input connection part which connects said 2nd load connection part and said common input connection part, It is characterized by the above-mentioned.

  According to the power supply device of the present invention, when normal and when the second load circuit or the third load circuit is disconnected, the current passing through the first load circuit is generated via the first input connection portion. When the first transistor element, the second transistor element, and the third transistor element are driven and the first load circuit is disconnected, the current that has passed through the second load circuit is supplied as the current. Supplied as a base current via the input connection unit 112 and drives the first transistor element, the second transistor element, and the third transistor element, so that any load circuit has failed. There is an effect that the current flowing through the load circuit other than the load circuit can be made substantially uniform.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.

FIG. 1 is a perspective view showing how the guide lamp device 800 is used in this embodiment.
The guide light device 800 is a device that lights a guide light that displays an emergency exit or the like, and is installed on a ceiling surface or the like.

FIG. 2 is a three-sided view showing the appearance of the guide light device 800 in this embodiment.
The guide light device 800 includes a main body 810, a power supply unit 820, and two panel units 830.
The main body 810 and the power supply unit 820 are embedded in the ceiling surface when in use.
The main body 810 incorporates a terminal block for connecting wiring from a commercial power source and the like, a rechargeable battery for lighting an induction lamp at the time of a power failure, and the like.
The power supply unit 820 incorporates a power supply device to be described later.
The two panel units 830 have the same configuration, and are portions that are visually recognized from the room when in use. The two panel units 830 are arranged back-to-back so that the guide light can be viewed visually when viewed from the front side or the back side of the guide light device 800.

FIG. 3 is an exploded view showing a configuration of panel unit 830 in this embodiment.
The panel unit 830 includes two LED units 831, a light guide plate 835, and a guide light display plate 838.
The LED unit 831 includes one or more light emitting diode elements, and light emitted from the light emitting diode elements is diffused by the light guide plate 835 and uniformly illuminates the entire surface of the guide light display plate 838.

The guide light display board 838 is a translucent board on which a figure defined by the Fire Service Act is drawn, and emits light by the light emission of the LED unit 831.
Note that the guide light display plate 838 is detachably attached to the panel unit 830, and can be exchanged for another design. Therefore, the guide light device 800 can be used for purposes other than the guide light.

FIG. 4 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
A guide lamp device 800 (light emitting diode lighting device) includes a power supply device 100 and four LED circuits 210 to 240.
The LED circuits 210 to 240 are each configured by connecting one or more light emitting diodes in series.

The guide lamp device 800 includes two panel units 830 and one panel unit 830 includes two LED units 831. Therefore, the guide lamp device 800 includes four LED units 831.
The four LED units 831 each have one of the LED circuits 210 to 240.
The LED unit 831 having the LED circuit 210 and the LED unit 831 having the LED circuit 220 are two LED units 831 provided in one panel unit 830. Another panel unit 830 includes an LED unit 831 having an LED circuit 230 and an LED unit 831 having an LED circuit 240.

The power supply apparatus 100 supplies a direct current voltage to the LED circuits 210 to 240 to light up the light emitting diode elements constituting the LED circuits 210 to 240.
The power supply apparatus 100 makes the currents flowing through the LED circuits 210 to 240 substantially uniform in order to equalize the luminance of the light emitting diode elements constituting the LED circuits 210 to 240.

When one of the four LED circuits 210 to 240 fails, the power supply device 100 stops supplying DC voltage to all LED circuits included in the same panel unit 830 as the failed LED circuit, and the light emitting diode Turn off the element. For example, when the LED circuit 210 fails, the power supply apparatus 100 stops supplying DC voltage to the LED circuit 210 and the LED circuit 220. If only the failed LED circuit is turned off and the other LED circuit is turned on, the guide light display board 838 emits light (although it becomes a little dark), so the user may not notice the failure. is there. The power supply apparatus 100 causes the user to reliably recognize the failure of the LED circuit by turning off not only the failed LED circuit but also the other LED circuit.
On the other hand, the LED circuit (in this example, the LED circuit 230 and the LED circuit 240) provided in the opposite panel unit 830 continues to be lit. As a result, the user is made aware of which LED unit included in which panel unit 830 has failed.

  The power supply apparatus 100 includes a variable DC power supply E71, a current mirror circuit 110, a switching element SW61, a switching element SW62, a variable resistor VR72, and a control circuit 150.

The variable DC power supply E71 (DC power supply circuit) is supplied with power from a commercial power supply during normal times and from a rechargeable battery during a power failure, and generates a DC voltage to be applied to the LED circuit 210 to the LED circuit 240.
The positive voltage terminal of the variable DC power supply E71 is the wire _{a 0,} is connected to the anode side of the LED circuit 210-240. The negative voltage side terminal of the variable DC power supply E71 is grounded.
Variable DC power supply E71, the potential of the wiring d ₀ (i.e., the voltage across the variable resistor VR72) so is constant, to adjust the voltage value of the generated direct current voltage. That is, the variable DC power supply E71 may raise the voltage value of the DC voltage to be generated when the potential of the wiring d ₀ is lower than a predetermined potential, generated when the potential of the wiring d ₀ is higher than a predetermined potential by lowering the voltage value of the DC voltage, the potential of the wiring d ₀ is made to be constant.

The current mirror circuit 110 includes a transistor Q11, a transistor Q12, a resistor R13, a resistor R14, a transistor Q21, a transistor Q22, a resistor R23, a resistor R24, and a diode D25.
Transistor Q11, transistor Q12, transistor Q21, and transistor Q22 are NPN bipolar transistors having the same characteristics.

The collector terminal of the transistor Q11 (first transistor element) is connected to the cathode side of the LED circuit 210 (first load circuit) via the wiring c ₁ (first load connection portion).
The collector terminal of the transistor Q12 (third transistor element) is connected to the cathode side of the LED circuit 220 (third load circuit) via the wiring c ₂ (third load connection portion).
The collector terminal of the transistor Q21 (second transistor element) is connected to the cathode side of the LED circuit 230 (second load circuit) via the wiring c ₃ (second load connection portion).
The collector terminal of the transistor Q22 (third transistor element or sixth transistor element) is connected to the cathode side of the LED circuit 240 (third load circuit or fourth load circuit) and the wiring c ₄ (third load connection portion). Or, it is connected via a fourth load connecting portion).

The base terminals of the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 are connected to each other via a wiring b ₀ (common input connection portion). Accordingly, the base potentials of the transistors Q11, Q12, Q21, and Q22 are all the same potential.

Further, the wiring b ₀ and the wiring c ₁ are connected by a wiring (first input connection portion 111). Therefore, the collector potential of the transistor Q11 is the same as the base potential of the transistor Q11, transistor Q12, transistor Q21, and transistor Q22.
The wiring _{b 0} and the wiring _{c 3,} are connected by a diode D25 (second input connection 112). Diode D25 has an anode terminal on the side of the wiring c _3, are connected to the cathode terminal side of the wiring b _0.

The emitter terminal of the transistor Q11 is connected to one end of the resistor R13 via the wiring e _1.
The emitter terminal of the transistor Q12 is connected to one end of the resistor R14 through the wiring e _2.
The other end of the resistor R13 and the other end of the resistor R14 are connected to each other and connected to one end of the switching element SW61.
The emitter terminal of the transistor Q21 is connected to one end of the resistor R23 via the wire e _3.
The emitter terminal of the transistor Q22 is connected to one end of the resistor R24 via the wire e _4.
The other end of the resistor R23 and the other end of the resistor R24 are connected to each other and connected to one end of the switching element SW62.

The other end and the other end of the switching element SW62 of the switching elements SW 61, connected to each other by the wiring _{d 0,} is connected to one end of the variable resistor VR72.
The other end of the variable resistor VR72 is grounded.

The resistance values of the resistor R13, the resistor R14, the resistor R23, and the resistor R24 are all the same.
The variable resistor VR72 (current detection unit) is a resistor that changes its resistance value according to a signal from the control circuit 150. The variable resistor VR72 is formed, for example, by connecting two resistors having the same resistance value in parallel and connecting a switching element in series with one resistor. When the switching element is turned on by a signal from the control circuit 150, the variable resistor VR72 is a parallel circuit of two resistors, so the combined resistance value is half of the resistance value of one resistor. When the switching element is turned off by a signal from the control circuit 150, the resistance value of the variable resistor VR72 is twice that of the switching element when it is on because the resistance value of one resistor is set.

  Since the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 have the same characteristics, the forward voltage drop generated at the PN junction between the base and the emitter is equal. Since the base potentials of the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 are the same potential, the emitter potential is also the same potential. For this reason, the emitter currents of the transistors Q11, Q12, Q21, and Q22 are equal.

  The switching element SW61 and the switching element SW62 are turned on / off by a signal from the control circuit 150. At normal time, the control circuit 150 keeps both the switching element SW61 and the switching element SW62 on.

The control circuit 150 detects an abnormality in the LED circuits 210 to 240 by measuring the potentials of the wiring c ₁ , the wiring c ₂ , the wiring c ₃ , and the wiring c ₄ .
The control circuit 150 (first abnormality detection unit) turns off the switching element SW61 (first switching element) when the abnormality of the LED circuit 210 or the LED circuit 220 is detected. Moreover, the control circuit 150 (2nd abnormality detection part) turns OFF switching element SW62 (2nd switching element), when abnormality of the LED circuit 230 or the LED circuit 240 is detected. As a result, the supply of DC voltage to all LED circuits included in the same panel unit 830 as the LED circuit that detected the abnormality is cut off.

Further, when the switching element SW61 or the switching element SW62 is turned off, the control circuit 150 changes the resistance value of the variable resistor VR72 and doubles it. Since the current that can be passed through one LED circuit is fixed (for example, 20 mA), a variable resistor is used when only two LEDs are turned off and only two LEDs are turned on, compared to when all four LED circuits 210 to 240 are turned on. The current flowing in the device VR72 is halved. Therefore, if the resistance value of the variable resistor VR72 twice the potential of the wiring d ₀ is unchanged. Therefore, when 4-lamp at even 2-lamp also, as the potential of the wiring d ₀ have the same value, by adjusting the voltage value of the DC voltage variable DC power supply E71 is generated, flowing in one LED circuit The currents are equal.

  Next, the operation will be described.

FIG. 5 is a graph (normal time) showing the potential of each part of the power supply device 100 according to this embodiment.
Here, V _LED1 is a voltage across the LED circuit 210. V _LED2 is a voltage across the LED circuit 220. V _LED3 is a voltage across the LED circuit 230. V _{LED 4} is a voltage across the LED circuit 240. V _D2 is a voltage across the diode D25. V _CE1 is a collector-emitter voltage of the transistor Q11. V _BE1 is a base-emitter voltage of the transistor Q11. V _CE2 is a collector-emitter voltage of the transistor Q12. V _BE2 is a base-emitter voltage of the transistor Q12. V _CE3 is a collector-emitter voltage of the transistor Q21. V _BE3 is a base-emitter voltage of the transistor Q21. V _CE4 is a collector-emitter voltage of the transistor Q22. V _BE4 is a base-emitter voltage of the transistor Q22. V _R1 is a voltage across the resistor R13. V _R2 is a voltage across the resistor R14. V _R3 is a voltage across the resistor R23. V _R4 is a voltage across the resistor R24. V _R0 is a voltage across the variable resistor VR72.

There is variation in the forward voltage drop of the light emitting diode element. This variation is particularly large when the light emitting diode element is a white light emitting diode.
For example, when the rated value of the forward drop voltage of one light emitting diode element is 3.0V to 3.5V, when four of these are connected in series, the total forward drop voltage of the four light emitting diode elements is: It is between 12.0V and 14.0V. In practice, it is unlikely that only a light emitting diode element having a small forward drop voltage or a light emitting diode element having a large forward drop voltage will be connected. Since the light emitting diode elements having a large direction drop voltage are mixed and connected, the variation in the forward drop voltage is canceled out and becomes about 0.5V.
For this reason, V _LED1 , V _LED2 , V _LED3 , and V _LED4 do not have the same value but vary within a range of 0.5V.

Since the transistors Q11, Q12, Q21, and Q22 are transistor elements having the same characteristics, _VBE1 , _VBE2 , _VBE3, and _VBE4 are equal.
Thus, the same potential to the wiring _{e 1} and line _{e 2} and the wiring _{e 3} and the wiring _{e 4,} the voltage across _{V R1} of the resistor R13, the voltage across _{V R2} of the resistor R14, the voltage V across the resistor R23 _{Since R3} is equal to the voltage V _R4 across resistor R24, the emitter current I _{E1 of} transistor Q11, the emitter current I _{E2 of} transistor Q12, the emitter current I _{E3 of} transistor Q21, and the emitter current I _{E4 of} transistor Q22 Are equal.

In this example, V _LED2 is larger than V _LED1 . As described above, the difference between V _LED2 and V _LED1 is within 0.5V. Since the base-emitter voltage V _BE2 of the transistor Q12 is about 0.7 V, for example, the collector-emitter voltage V _CE2 of the transistor Q12 is 0.2 V or more, and the transistor Q12 operates normally.

In this example, V _LED3 is smaller than _VLED1 . Similarly, the difference between V _LED3 and V _LED1 is within 0.5V. Therefore, the voltage V _D2 across the diode D25 is within 0.5V. Since the forward drop voltage of the diode D25 is about 0.7V, for example, the diode D25 is turned off.
Therefore, the base current _{I B1,} the base current _{I B2} of the transistor Q12, the base current _{I B4} of the base current _{I B3,} the transistor Q22 of the transistors Q21 of the transistor Q11 is supplied via the wiring _{c 1.}

That is, the current I ₂ flowing through the LED circuit 220, the current I ₃ flowing through the LED circuit 230, and the current I ₄ flowing through the LED circuit 240 are equal. The current I ₁ flowing through the LED circuit 210 is larger than the base current (I _B1 + I _B2 + I _B3 + I _B4 = I _B × 4), but h _{FE of the} transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22. Since the difference is negligible, the current I ₁ flowing through the LED circuit 210 is also equal to the current I ₂ flowing through the LED circuit 220, the current I ₃ flowing through the LED circuit 230, and the current I ₄ flowing through the LED circuit 240. Is almost equal to

  Next, a case where an abnormality occurs in the LED circuit 220 and the circuit is disconnected (open failure) will be described.

FIG. 6 is a graph (when the LED circuit 220 is disconnected) showing the potential of each part of the power supply device 100 according to this embodiment.
Since the LED circuit 220 is disconnected, the collector terminal of the transistor Q12 becomes the open state, the collector of the transistor Q12 - becomes emitter voltage _{V CE2} nearly zero.
The control circuit 150 detects that the potential of the wiring _{c 2} is lower than the normal, to detect an abnormality of the LED circuit 220. The control circuit 150 turns off the switching element SW61 and doubles the resistance value of the variable resistor VR72.

Since the switching element SW61 is turned off, the emitter current I _E1 of the transistor Q11 and the emitter current I _E2 of the transistor Q12 become zero. As a result, the current flowing through the LED circuit 210 is equal to the base current I _B3 of the transistor Q21 and the base current I _B4 of the transistor Q22. Therefore, the light-emitting diode element of the LED circuit 210 is not completely turned off, but is visually turned off.

  The operation in the case where an abnormality occurs in the LED circuit 230 or the LED circuit 240 and the circuit is disconnected is the same.

Note that when the LED circuit 220, the LED circuit 230, or the LED circuit 240 is disconnected, a pull-down resistor is connected to each to prevent the potentials of the wiring c ₂ , the wiring c ₃ , and the wiring c _{4 from} becoming unstable. Also good.

  Next, the case where an abnormality occurs in the LED circuit 210 and the circuit is disconnected will be described.

FIG. 7 is a graph (when LED circuit 210 is disconnected) showing the potential of each part of power supply device 100 in this embodiment.
Since the base current is not supplied because the LED circuit 210 is disconnected, the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 are turned off.
Then, the potential of the wiring d ₀ is lowered, the variable DC power supply E71 may raise the voltage value of the generated DC voltage, the potential of the wiring a ₀ is increased.
When the potential difference between the wiring a ₀ and the wiring b ₀ reaches the total value of the forward voltage drop of the LED circuit 230 and the forward voltage drop of the diode D25, the diode D25 is turned on, and the base current is passed through the diode D25. Thus, the transistors Q11, Q12, Q21, and Q22 are turned on again.
As a result, the recovery potential of the wiring d ₀ is a variable DC power supply E71 is stabilized voltage value of the generated DC voltage while maintaining intact.

At this time, since the wiring _{c 1} is connected to the wiring _{b 0,} even if LED circuit 210 is disconnected, the potential of the wiring _{c 1} remains the same potential as the wiring _{b 0.} Therefore, the control circuit 150 can not detect the abnormality of the LED circuit 210 from the potential of the wiring _{c 1.}
However, the potential of the wiring c ₂ is, so to increase as much as the increase in the potential of the wiring a _0, the potential difference between the wiring c ₁ and the wiring c ₂ is changed. The control circuit 150 detects an abnormality in the LED circuit 210 by detecting that the potential difference between the wiring c ₁ and the wiring c ₂ has changed compared to the normal time.
The control circuit 150 turns off the switching element SW61 and doubles the resistance value of the variable resistor VR72.
By switching element SW61 is turned off, the current _{I 2} flowing through the LED circuit 220 becomes 0, the light emitting diode element of the LED circuit 220 is turned off.

As described above, the control circuit 150 detects an abnormality in the LED circuit 210 by comparing the potential difference between the wiring c ₁ and the wiring c ₂ with the potential difference at the normal time.
However, since the potential difference between the wiring c ₁ and the wiring c ₂ also changes when there is an abnormality in the LED circuit 220, it is not possible to distinguish whether there is an abnormality in the LED circuit 210 or the LED circuit 220 with this method. There is sex.
However, even if there is an abnormality in the LED circuit 210 and an abnormality in the LED circuit 220, the operation of turning off the switching element SW61 does not change, so it is not necessary to distinguish which is abnormal.

Further, the potential of the wiring c _{3 and} the potential of the wiring c ₄ change when the LED circuit 210 is disconnected. However, the potential difference between the wiring c ₃ and the wiring c ₄ is the same as normal. Therefore, the control circuit 150, a potential difference between the wiring _{c 3} and the wiring _{c 4,} by comparing the potential difference at the time of normal, the LED circuit 230 and LED circuit 240 may detect that there is no abnormality.

  According to the power supply device 100 in this embodiment, when the second load circuit (the LED circuit 230) or the third load circuit (the LED circuit 220 or the LED circuit 240) is disconnected during normal operation, A current passing through the load circuit (LED circuit 210) is supplied as a base current via the first input connection portion 111 (wiring), and the first transistor element (transistor Q11), the second transistor element (transistor Q21), and When the third transistor element (transistor Q12 or transistor Q22) is driven and the first load circuit (LED circuit 210) is disconnected, the current passing through the second load circuit (LED circuit 230) is second. The first transistor element (transistor) is supplied as a base current via the input connection part 112 (diode D25). Q11), the second transistor element (transistor Q21) and the third transistor element (transistor Q12 or transistor Q22) are driven, so that the current mirror circuit 110 operates regardless of which load circuit fails. There is an effect that the currents of the load circuits other than the failed load circuit can be made substantially equal.

According to the power supply device 100 in this embodiment, the potential of the second load connection portion (wiring c ₃ ) is higher than the potential of the first load connection portion (wiring c ₁ ) due to variations in the voltage across the load circuit. Even if there is a diode element (diode D25) if the potential difference between the second load connection part (wiring c ₃ ) and the first load connection part (wiring c ₁ ) is equal to or lower than the forward drop voltage of the diode element (diode D25). ) Is turned off, the current mirror circuit 110 operates in the same manner as a conventional current mirror circuit in a normal state. Further, when the first load circuit (LED circuit 210) is disconnected, the diode element (diode D25) is turned on, and the base current can be supplied.

  In this embodiment, the case where an NPN type bipolar transistor is used has been described. However, the current mirror circuit 110 can also be realized by using a PNP type bipolar transistor as in the conventional current mirror circuit. Since the configuration of the power supply device 100 in that case is clear from the description of the power supply device 100 in this embodiment, the description is omitted here.

  As a result, the same effects as those of the power supply apparatus 100 described in this embodiment can be obtained.

  According to the power supply apparatus 100 in this embodiment, when the first abnormality detection unit (control circuit 150) detects an abnormality in the LED circuit 210, the supply of the DC voltage to the LED circuit 210 is cut off, so that an abnormal current is generated. There is an effect that can be prevented from flowing.

  According to the power supply device 100 in this embodiment, when the second abnormality detection unit (control circuit 150) detects an abnormality in the LED circuit 230, the supply of the DC voltage to the LED circuit 230 is cut off, so that an abnormal current is generated. There is an effect that can be prevented from flowing.

  According to the power supply device 100 in this embodiment, when an abnormality occurs in the first load circuit (LED circuit 210) or the third load circuit (LED circuit 220), the first load circuit (LED circuit 210). ) And the third load circuit (LED circuit 220) are cut off, so that the abnormality of the first load circuit (LED circuit 210) and the abnormality of the third load circuit (LED circuit 220) are not necessarily limited. There is no need to make a clear distinction, and there is an effect that abnormality detection is easy.

  According to the power supply device 100 in this embodiment, when an abnormality occurs in either the first load circuit (LED circuit 210) or the third load circuit (LED circuit 220), the abnormality can be easily detected. There is an effect.

  According to the power supply device 100 in this embodiment, when an abnormality occurs in the second load circuit (LED circuit 230) or the fourth load circuit (LED circuit 240), the second load circuit (LED circuit 230). ) And the fourth load circuit (LED circuit 240) are cut off, so that the abnormality of the second load circuit (LED circuit 230) and the abnormality of the fourth load circuit (LED circuit 240) are not necessarily limited. There is no need to make a clear distinction, and there is an effect that abnormality detection is easy.

  According to the power supply device 100 in this embodiment, when an abnormality occurs in either the second load circuit (LED circuit 230) or the fourth load circuit (LED circuit 240), the abnormality can be easily detected. There is an effect.

  According to the power supply device 100 in this embodiment, the current flows through the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240). The current flowing through the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240) is made constant with the sum of currents constant. Since the current is almost uniform, the currents flowing through the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240) are set to predetermined values. There is an effect that it can be.

  According to the power supply apparatus 100 in this embodiment, when the first switching element (switching element SW61) or the second switching element (switching element SW62) is turned off due to abnormality detection, the total sum of currents to flow changes. Since the resistance value of the current detection circuit (variable resistor VR72) changes, there is no need to change the target value of the voltage across the power supply detection circuit targeted by the DC power supply (variable DC power supply E71). There is an effect that the configuration of the power supply E71) can be simplified.

  According to the light emitting diode lighting device (guide light device 800) in this embodiment, the first light emitting diode circuit (LED circuit 210), the second light emitting diode circuit (LED circuit 230), and the third light emitting diode circuit (LED circuit 220). Or, even if one of the LED circuits 240) fails, the current flowing in the light emitting diode circuits other than the failed light emitting diode circuit can be made almost uniform, so that the luminance of the light emitting diode elements is made almost uniform. There is an effect that can be done.

According to the guide light device 800 in this embodiment, when an abnormality occurs in the first light emitting diode circuit (LED circuit 210) or the third light emitting diode circuit (LED circuit 220), the first light emitting diode circuit (LED circuit) 210) and the third light emitting diode circuit (LED circuit 220) are cut off from the supply of DC voltage, so that the first guide light display board 838 becomes dark, and the user can be surely recognized that the light emitting diode circuit has failed. There is an effect that can be done.
According to the guide light device 800 in this embodiment, when an abnormality occurs in the second light-emitting diode circuit (LED circuit 230) or the fourth light-emitting diode circuit (LED circuit 240), the second light-emitting diode circuit (LED circuit). 230) and the fourth light emitting diode circuit (LED circuit 240) are cut off, so that the second guide light display board 838 becomes dark and the user can be surely recognized that the light emitting diode circuit has failed. There is an effect that can be done.

In this example, two transistor elements Q11 and Q21 are connected between the wiring connecting the collector terminal (load connection portion) and the wiring connecting the base terminal (common input connection portion). There may be three or more.
In that case, the number of diode elements is increased in order, for example, the collector and base of the third transistor element are connected by a series circuit of two diode elements.

  In this example, when an abnormality occurs in one LED circuit, two LED circuits included in the same panel unit 830 are turned off at the same time, but switching elements are provided corresponding to the two LED circuits. One switching element may correspond to three or more LED circuits, or a switching element may be provided for each LED circuit.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 8 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

The current mirror circuit 110 further includes a diode D15 and a diode D26.
The diode D15 (first input connection portion 111) connects the wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion). The anode terminal of the diode D15 on the side of the wiring c _1, the cathode terminal is connected to the side of the wiring b _0.
Diode D25 and the diode D26 (second input connection 112) is connected in series to the connection wiring _{c 3} and (the second load connecting portions) and a wire _{b 0.} The anode terminal of the diode D25 and the diode D26 on the side of the wiring c _3, the cathode terminal is connected to the side of the wiring b _0.

FIG. 9 is a graph (normal time) showing the potential of each part of the power supply device 100 according to this embodiment.
Here, V _D1 is a voltage across the diode D15. V _D2 is the sum of the voltage across the diode D25 and the voltage across the diode D26. The other symbols are the same as those used in the first embodiment.

If V _D1 is equal to or higher than the forward drop voltage (eg, 0.7 V) of the diode D15, the diode D15 is turned on. If VD2 is equal to or greater than the total of the forward drop voltage of the diode D25 and the forward drop voltage of the diode D26 (for example, 1.4 V), the diode D25 and the diode D26 are turned on.

_First, if the from _{V LED1 V LED 3} is large, _or smaller _{V LED 3} than _{V LED1,} the difference between _{V LED1} and _{V LED 3} is the forward drop of the total and the diode D15 in the forward drop voltage of the diode D25 and the diode D26 A case where the difference is smaller than the voltage will be described.

When the voltage value of the DC voltage generated by the variable DC power source E71 is low, the diode D15, the diode D25, and the diode D26 are all off, so that the base current is not supplied, and the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 Both are turned off. Therefore, no current flows to the variable resistor VR72, the potential of the wiring d ₀ is low, the variable DC power supply E71 raises the voltage value of the generated direct current voltage.

When V _D1 reaches the forward drop voltage of the diode D15, the diode D15 is turned on, so that a base current is supplied, and the transistors Q11, Q12, Q21, and Q22 are turned on. Thus, increases the potential of the wiring d ₀ is where a predetermined potential, the voltage value of the DC voltage variable DC power supply E71 is generated is stabilized.

At this time, since V _D2 is lower than the sum of forward drop voltages of the diode D25 and the diode D26, the diode D25 and the diode D26 remain off. Accordingly, the base currents of the transistors Q11, Q12, Q21, and Q22 are supplied through the LED circuit 210 and the diode D15.

As in the case described in the first embodiment, it is assumed that V _LED2 is larger than _VLED1 .
In order for the transistor Q12 to operate normally, the collector-emitter potential difference _VCE2 needs to be positive. For this purpose, the difference between V _LED2 and V _LED1 only needs to be smaller than the total (eg, 1.4 V) of V _BE2 (eg, 0.7 V) and V _D1 (eg, 0.7 V).

  That is, as compared with the first embodiment, the current mirror circuit 110 operates normally even when the variation in the voltage across the LED circuits 210 to 240 is large.

Next, the case where V _LED3 is smaller than V _LED1 and the difference between V _LED1 and V _LED3 is greater than the difference between the total forward drop voltage of diode D25 and diode D26 and the forward drop voltage of diode D15 will be described. .

In this case, the diode D25 and the diode D26 are turned on earlier than the diode D15, and supply of the base current is started. Therefore, the increase in the voltage value of the DC voltage generated by the variable DC power supply E71 is stopped, and the diode D15 is turned off. Will remain. Therefore, the base currents of the transistors Q11, Q12, Q21, and Q22 are supplied through the LED circuit 230 and the diode D25 and the diode D26.
As a result, except that the current I ₃ flowing through the LED circuit 230 is larger by the base current than the currents I ₁ , I ₂ , and I ₄ flowing through other LED circuits, the current mirror circuit 110 has the diode D15 turned on. Works as if.

  That is, as compared with the first embodiment, the current mirror circuit 110 operates normally even when the variation in the voltage across the LED circuits 210 to 240 is large.

  Next, the case where an abnormality occurs in the LED circuit 210 and the circuit is disconnected will be described.

FIG. 10 is a graph (when the LED circuit 210 is disconnected) showing the potential of each part of the power supply device 100 according to this embodiment.
By LED circuit 210 is disconnected, the potential of the wiring _{c 1} is lowered. Unlike the first embodiment, since the diode D15 is connected between the wiring c1 and the wiring _{b 0,} the potential of the wiring _{c 1,} the collector of the transistor Q11 - where become emitter voltage _{V CE1} nearly zero The voltage V _D1 across the diode D15 becomes negative.

The control circuit 150 detects that the potential of the wiring _{c 1} drops below normal, to detect an abnormality of the LED circuit 210. Unlike the first embodiment, it is possible to detect the abnormality without compared to the potential of the wiring c _2, an abnormality of the abnormality and LED circuit 220 of LED circuit 210 can be easily distinguished.

Note that when the LED circuit 210 is disconnected, to prevent the potential of the wiring c ₁ becomes unstable, may be connected to a pull-down resistor.

  According to the power supply device 100 in this embodiment, both ends of the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240). Even when the voltage variation is large, the current flowing through the load circuit can be substantially equalized.

  According to the power supply device 100 in this embodiment, both ends of the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240). Even when the voltage variation is large, the current flowing through the load circuit can be substantially equalized.

  According to the power supply device 100 in this embodiment, the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), the third load circuit (LED circuit 220), and the fourth load circuit. When an abnormality occurs in the (LED circuit 240), it is possible to easily detect the abnormality and easily distinguish which load circuit has the abnormality.

Embodiment 3 FIG.
Embodiment 3 will be described with reference to FIG.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 11 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

The current mirror circuit 110 further includes a transistor Q17 and a transistor Q27.
The transistor Q17 (first input connection portion 111) connects the wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion). The base terminal side of the wiring c ₁ of the transistor Q17 (fourth transistor element), the emitter terminal is connected to the side of the wiring b _0. The collector terminal of the transistor Q17 is connected to the wiring a ₀ which is connected to the positive voltage terminal of the variable DC power supply E71.

The transistor Q27 and the diode D25 (second input connection portion 112) connect the wiring c ₃ (second load connection portion) and the wiring b ₀ (common input connection portion). On the side of the transistor Q27 base terminal of the (fifth transistor element) lines c _3, the emitter terminal is connected to the side of the wiring b _0. The collector terminal of the transistor Q27 is connected to the wiring _{a 0.} The anode terminal of the diode D25 on the side of the wiring c _3, the cathode terminal is connected to the side of the wiring b _0. Transistor Q27 and diode D25 are in a serial relationship. In this example, the emitter terminal of the transistor Q27 and the anode terminal of the diode D25 are connected, but the order of the transistor Q27 and the diode D25 may be reversed. That is, the diode and the base terminal of the cathode terminal of transistor Q27 is connected to D25, the anode terminal wire c ₃ of the diode D25, may be the emitter terminal of the transistor Q27 is not connected to the wiring b _0.

  Transistors Q17 and Q27 are NPN bipolar transistors. Note that the characteristics of the transistor Q17 and the characteristics of the transistor Q27 are not necessarily the same.

  Assuming that the base-emitter PN junction of the transistor Q17 is the diode D15 in the second embodiment and the base-emitter PN junction of the transistor Q27 is the diode D26 in the second embodiment, each part of the power supply device 100 It can be seen that the potential is the same as that described in Embodiment Mode 2.

In the second embodiment, the base current of the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 is extracted from the current flowing through the LED circuit 210 or the LED circuit 230. However, in this embodiment, the LED circuit 210 or Since the current extracted from the current flowing through the LED circuit 230 is the base current of the transistor Q17 or the transistor Q27, and the emitter current amplified by the transistor Q17 or the transistor Q27 is the base current of the transistors Q11, Q12, Q21, and Q22. , current drawn from the current flowing through the LED circuit 210 or LED circuit 230 suffices _{h FE} content of the first transistor Q17 or transistor Q27.

Thus, transistors Q11, transistor Q12, transistor Q21, even if _{h FE} of the transistor Q22 is not so large, the current flowing through the current _I 2, LED circuit 230 through the current _I 1, LED circuit 220 through the LED circuit 210 The difference between I ₃ and the current I ₄ flowing through the LED circuit 240 is negligible.

Here, the case where an abnormality occurs in the LED circuit 220 and the LED circuit 220 is disconnected will be described in more detail.
By disconnecting the LED circuit 220, the collector current of the transistor Q12 becomes zero.
If the control circuit 150 detects an abnormality and turns off the switching element SW61, the emitter current of the transistor Q12 also becomes zero. However, until the control circuit 150 turns off the switching element SW61 after the LED circuit 220 is disconnected. There is a time lag.

During the period from the disconnection of the LED circuit 220 to the switching element SW61 is turned off, the resistor R14, voltage corresponding to a potential difference between the wiring _{e 2} and the wiring _{d 0} is applied. Since the base-emitter voltage V _BE2 of the transistor Q12 is not changed before the LED circuit 220 is disconnected, the voltage across the resistor R14 is the same as that before the LED circuit 220 is disconnected. Therefore, the same current flows through the resistor R14 as before the LED circuit 220 is disconnected.
This current is the emitter current of the transistor Q12, but is equal to the base current of the transistor Q12 because the collector current of the transistor Q12 is zero.

  Since power supply device 100 in the first or second embodiment extracts the base current of transistor Q12 from the current flowing through LED circuit 210 or LED circuit 230, this current flows through LED circuit 210 or LED circuit 230. . That is, until the switching element SW61 is turned off, twice the normal current flows through the LED circuit 210 or the LED circuit 230, so that the LED circuit 210 or the LED circuit 230 fails or has a short life. There is a possibility of becoming.

  On the other hand, power supply device 100 in this embodiment does not extract the base current of transistor Q12 from the current flowing through LED circuit 210 or LED circuit 230, but by the emitter current amplified by transistor Q17 or transistor Q27. Supply. Therefore, although the current flowing through the LED circuit 210 and the LED circuit 230 increases due to the increase in the base current of the transistor Q17 or the transistor Q27, the difference is slight and is not much different from the normal time. For this reason, the LED circuit 210 and the LED circuit 230 do not break down and the lifetime is not shortened.

  In addition, although the case where the LED circuit 220 was cut | disconnected was demonstrated here, the same thing can be said even when the other LED circuit 210,230,240 cut | disconnects.

According to the power supply device 100 in this embodiment, the transistor Q17 or the transistor Q27 amplifies the base current extracted from the current flowing through the LED circuit 210 or the LED circuit 230, and the emitter current of the transistor Q17 or the transistor Q27 is converted into the transistor Q11. and since the base current of the transistor Q12 and the transistor Q21 and the transistor Q22, transistors Q11, transistor Q12, transistor Q21, even with a small _{h FE} of the transistor Q22, in the normal, LED circuit 210 and LED circuit 220 and LED circuit 230 In addition, the current flowing through the LED circuit 240 can be made substantially uniform.
In addition, when the LED circuit 210, the LED circuit 220, the LED circuit 230, or the LED circuit 240 is disconnected, an abnormal current can be prevented from flowing through the LED circuit 210 or the LED circuit 230.

Although the case where an NPN bipolar transistor is used as the transistor Q17 and the transistor Q27 has been described, the transistor Q17 and the transistor Q27 may be N-channel field pressure effect transistors.
In that case, the side of the gate terminal wire c ₁ of the transistor Q17, a source terminal on the side of the wiring b _0, a drain terminal connected to the side of the wiring a _0. Further, on the side of the wire c ₃ a gate terminal of the transistor Q27, a source terminal on the side of the wiring b _0, a drain terminal connected to the side of the wiring a _0.
When field effect transistors are used as the transistor Q17 and the transistor Q27, it is preferable to use a MOS-FET (insulated field effect transistor) because the gate current becomes 0, so that there is almost no difference in current flowing through the LED circuits 210 to 240. Also, we find that using the enhancement type FET is, the potential of the wiring _{c 1} and the wiring _{c 3} becomes higher than the potential of the wiring _{b 0,} preferred.

  Further, as the transistor Q17 and the transistor Q27, a PNP bipolar transistor or a P-channel FET may be used.

Embodiment 4 FIG.
The fourth embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 12 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

The current mirror circuit 110 further includes a diode D15.
The diode D15 (first input connection portion 111) connects the wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion) as in the second embodiment. The anode terminal of the diode D15 on the side of the wiring c _1, the cathode terminal is connected to the side of the wiring b _0.
Unlike Embodiment 2, between the wiring c ₃ (second load connection portion) and the wiring b ₀ (common input connection portion), a diode D25 (second input connection portion) is not a series circuit of a plurality of diode elements. 112) Only one is connected.

FIG. 13 is a graph (normal time) showing the potential of each part of the power supply device 100 according to this embodiment.
Assuming that the forward voltage drop of the diode D15 and the forward effect voltage of the diode D25 are substantially equal, if the voltage V _LED3 across the LED circuit 230 is smaller than the voltage V _LED1 across the LED circuit 210, the voltage across the diode D25 First reaches the forward effect voltage, the diode D25 is turned on and the diode D15 remains off.
Conversely, if the voltage V _LED3 across the LED circuit 230 is greater than the voltage V _LED1 across the LED circuit 210, the diode D15 is turned on and the diode D25 remains off.

  In any case, the base current is supplied to the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 through the diode element that is turned on first, and the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 are It is turned on and the current mirror circuit 110 operates.

That is, in the _first to third embodiments, the configuration of the first input connection portion 111 that connects the wiring c ₁ and the wiring b ₀ and the second input connection portion that connects the wiring c ₃ and the wiring b _0. By providing a difference from the configuration of 112, priority is provided to the base current supply sources of the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22. On the other hand, in this embodiment, the configuration of the first input connection unit 111 and the configuration of the second input connection unit 112 are made the same, and no priority is provided to the base current supply source.

  As described above, the current mirror circuit 110 operates normally even if the base current supply source is not prioritized. Therefore, the same effect as in the second embodiment can be obtained.

  The first input connection unit 111 and the second input connection unit 112 are both a plurality of diode elements connected in series, so that the configuration of the first input connection unit 111 and the configuration of the second input connection unit 112 are the same. It may be. By doing so, the current mirror circuit 110 operates normally even when the variation in the voltage across the LED circuits 210 to 240 is even greater.

FIG. 14 is an electric circuit diagram showing another example of the configuration of the electric circuit of the guide lamp device 800 according to this embodiment.
In this way, the first input connection portion 111 is configured by the transistor Q17, the second input connection portion 112 is configured by the transistor Q27, and the configuration of the first input connection portion 111 and the configuration of the second input connection portion 112 are It may be the same.
Thereby, the same effect as Embodiment 3 can be acquired.

FIG. 15 is an electric circuit diagram showing still another example of the configuration of the electric circuit of the guide lamp device 800 according to this embodiment.
As described above, the first input connection unit 111 is configured by the transistor Q17 and the diode D15, and the second input connection unit 112 is configured by the transistor Q27 and the diode D25, so that the configuration of the first input connection unit 111 and the second input connection are configured. The configuration of the unit 112 may be the same.
As a result, even when the variation in the voltage across the LED circuits 210 to 240 is further large, the current mirror circuit 110 operates normally.

  According to the power supply device 100 in this embodiment, the same effects as those of the power supply device 100 described in the second and third embodiments can be obtained.

In this example, two transistor elements Q11 and Q21 are connected between the wiring connecting the collector terminal (load connection portion) and the wiring connecting the base terminal (common input connection portion). There may be three or more.
In that case, the connection between the collector and the base of the third transistor element may be the same configuration as the first input connection part 111 and the second input connection part 112, or the number of diode elements is increased. Different configurations may be used.

Embodiment 5. FIG.
The fifth embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 16 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

The current mirror circuit 110 further includes a transistor Q17, a diode D15, a diode D16, a transistor Q27, and a diode D26.
Between the wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion), a series circuit (first input connection portion 111) of the base-emitter of the transistor Q17, the diode D15, and the diode D16 is interposed. Connected. The order of the transistor Q17, the diode D15, and the diode D16 may be different from this. Further, the number of diode elements may be three or more.
Between the wiring c ₃ (second load connection portion) and the wiring b ₀ (common input connection portion), a series circuit (second input connection portion 112) of the base-emitter of the transistor Q27, the diode D25, and the diode D26 is interposed. Connected. The order of the transistor Q27, the diode D25, and the diode D26 may be different from this. Further, the number of diode elements may be three or more.
In addition, the structure of the 1st input connection part 111 and the structure of the 2nd input connection part 112 may differ.

Here, the total forward voltage drop of the first input connection 111, which is the sum of the forward voltage drop between the base and emitter of the transistor Q17, the forward voltage drop of the diode D15, and the forward voltage drop of the diode D16, is: The LED circuit 210 is configured to be larger than the forward voltage drop per light emitting diode element.
Similarly, the total forward voltage drop of the second input connection unit 112 is configured to be larger than the forward voltage drop per light emitting diode element constituting the LED circuit 230.
If the total forward voltage drop can be increased by using a diode element having a large forward voltage drop, the first input connection part 111 and the second input connection part 112 each include only one diode element. May be.

Next, a case where an abnormality occurs in the LED circuit will be described.
In addition to the disconnection (open failure) described above, the light emitting diode element may be short-circuited (short-circuit failure). That is, this is a case where one of the light emitting diode elements constituting the LED circuit is short-circuited.
When one of the light-emitting diode elements constituting the LED circuit is short-circuited due to an abnormality, the voltage drop in the light-emitting diode element becomes 0, so that the forward voltage drop of the entire LED circuit becomes low. This appears as a change beyond the range assumed as the variation in the normal forward voltage drop.

FIG. 17 is a graph diagram (at the time of LED circuit 220 short-circuit abnormality) showing the potential of each part of the power supply device 100 in this embodiment.
Here, V _D1 is the voltage across the first input connection portion 111, that is, the potential difference between the base terminal of the transistor Q17 and the cathode terminal of the diode D16. V _D2 is the voltage across the second input connection 112, that is, the potential difference between the base terminal of the transistor Q27 and the cathode terminal of the diode D26.

In this example, the voltage V _LED1 across the LED circuit 230 is greater than the voltage V _LED3 across the LED circuit 230 than the voltage V _LED1 across the LED circuit 210, so that the voltage across the first input connection 111 is the total forward voltage drop across the first input connection 111 first. The transistor Q17, the diode D15, and the diode D16 are turned on.

Due to the short circuit abnormality of the LED circuit 220, the voltage V _LED2 across the LED circuit 220 decreases. As a result, the collector-emitter voltage V _CE2 of the transistor Q12 increases, but since the transistor Q12 operates in the saturation region, the current flowing through the LED circuit 220 (the collector current of the transistor Q12) hardly changes.
The control circuit 150 detects that the potential of the wiring C ₂ is higher than normal, to detect an abnormality of the LED circuit 220.

FIG. 18 is a graph showing the potential of each part of the power supply device 100 according to this embodiment (when the LED circuit 210 is short-circuited abnormally).
Due to the short circuit abnormality of the LED circuit 210, the voltage V _LED1 across the LED circuit 210 decreases. Thus, the voltage across _{V D1} of the first input connection 111 increases, transistors Q11, transistor Q12, transistor Q21, since the base current of the transistor Q22 increases, raise the potential of the wiring _{d 0,} the variable DC power supply E71 is since lowering the voltage value of the generated DC voltage, eventually, the potential of the wiring c ₁ is stable at the same potential as the abnormality before. Since the voltage value of the DC voltage of the variable DC power supply E71 is lowered, the potentials of the wiring c ₂ , the wiring c ₃ , and the wiring c ₄ are lowered.

Here, since the total forward voltage drop of the first input connection portion 111 is larger than the forward voltage of the short-circuited light emitting diode element, the transistor Q12 can be used even if the potentials of the wiring c ₂ , the wiring c ₃ , and the wiring c ₄ are lowered. The collector-emitter voltages of the transistors Q21 and Q22 are positive, and the current mirror circuit 110 operates normally.
The control circuit 150 detects that the potential difference between the wiring c ₁ and the wiring c ₂ has changed, and detects an abnormality in the LED circuit 210.

When the control circuit 150 detects a short circuit abnormality in the LED circuit 210 and turns off the switching element SW61, the emitter currents of the transistors Q11 and Q12 become 0, and the LED circuit 210 and the LED circuit 220 are turned off.
However, since no change potential difference between the wiring _{c 1} and the wiring _{b 0,} a small current through the LED circuit 210 becomes the base current of the transistor Q17, the base current of the emitter current the transistor Q21 and the transistor Q22 is amplified by the transistor Q17 It becomes.
Therefore, even after the switching element SW61 is turned off, the potentials of the respective parts are almost the same as those in FIG.

If the total forward voltage drop of the first input connection portion 111 is small, the current mirror circuit 110 operates normally when the LED circuit 220 is abnormally short-circuited. However, when the LED circuit 210 is abnormally short-circuited, the transistors Q12, Q21, There is a possibility that the collector-emitter voltage of Q22 becomes negative and the current mirror circuit 110 does not operate normally.
When the current mirror circuit 110 does not operate normally due to a short circuit abnormality, the potential of each part does not change even when the switching element SW61 is turned off, and the operation of the current mirror circuit 110 is not recovered.

  On the other hand, in the power supply device 100 in this embodiment, the total forward voltage drop of the first input connection unit 111 is made larger than the forward voltage drop per light emitting diode element constituting the LED circuit 210. Therefore, even when the LED circuit 210 is short-circuited abnormally, the current mirror circuit 110 operates normally.

  The same applies to the second input connection portion 112. That is, if the total forward voltage drop of the second input connection part 112 is made larger than the forward voltage drop per light emitting diode element constituting the LED circuit 230, the current can be reduced even when the LED circuit 230 is short-circuited abnormally. The mirror circuit 110 operates normally.

  According to the power supply device 100 in this embodiment, even when the voltage across the LED circuit 210 or the LED circuit 230 decreases due to a short circuit abnormality or the like, the current mirror circuit 110 operates normally.

Embodiment 6 FIG.
The sixth embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 19 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

The current mirror circuit 110 further includes a transistor Q17, a switching element SW18, a diode D15, a transistor Q27, and a switching element SW28.
Between the wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion), a series circuit (first input connection portion 111) of the base-emitter of the transistor Q17, the switching element SW18, and the diode D15 is connected. Connected through. Note that the order of the transistor Q17, the switching element SW18, and the diode D15 may be different. Further, the diode D15 may not be provided.
Between the wiring c ₃ (second load connection portion) and the wiring b ₀ (common input connection portion), a series circuit (second input connection portion 112) of the base-emitter of the transistor Q27, the switching element SW28, and the diode D25 is provided. Connected through. Note that the order of the transistor Q27, the switching element SW28, and the diode D25 may be different. Further, the diode D25 may not be provided.
The configuration of the first input connection unit 111 and the configuration of the second input connection unit 112 may be different.

  The switching element SW18 and the switching element SW28 are turned on / off based on a signal from the control circuit 150. At the normal time, the control circuit 150 keeps both the switching element SW18 and the switching element SW28 on.

When the abnormality of the LED circuit 210 is detected, the control circuit 150 turns off the switching element SW18. When the switching element SW18 is turned off, the connection is interrupted between the wiring c ₁ and the wiring b _0.
The control circuit 150 may turn off the switching element SW18 only when a short circuit abnormality of the LED circuit 210 is detected, or may turn off the switching element SW18 when an abnormality of the LED circuit 220 is detected. .
Similarly, control circuit 150, when detecting an abnormality of an LED circuit 230, turns off the switching element SW28, to cut off the connection between the wiring _{c 3} and the wiring _{b 0.}

As described in the fifth embodiment, when the total forward voltage drop of the first input connection unit 111 and the second input connection unit 112 is low, the current is generated when a short circuit abnormality occurs in the LED circuit 210 or the LED circuit 230. There is a possibility that the mirror circuit 110 does not operate normally.
On the other hand, if the total forward voltage drop of the first input connection part 111 and the second input connection part 112 is increased, the voltage value of the DC voltage generated by the variable DC power supply E71 during normal operation needs to be increased accordingly. The power consumption of the lamp device 800 increases.
The power consumption of the guide light device 800 is desired to be as low as possible. If the power consumption of the guide light device 800 is low, not only will it save energy during normal times, but the battery life of the rechargeable battery will be longer at the time of a power outage. This is because the 800 can be reduced in size and cost.

  From the above viewpoint, the power supply apparatus 100 according to this embodiment dares to set the total forward voltage drop of the first input connection unit 111 and the second input connection unit 112 low.

FIG. 20 is a graph diagram (at the time of LED circuit 210 short circuit abnormality) showing the potential of each part of the power supply device 100 in this embodiment.
When a short circuit abnormality occurs in the LED circuit 210, the voltage value of the DC voltage generated by the variable DC power supply E71 decreases, and the collector-emitter voltages of the transistors Q12, Q21, and Q22 become zero.
The transistor Q12, the transistor Q21, and the transistor Q22 are turned off, the collector current becomes 0, and the voltage across the LED circuit 220, the LED circuit 230, and the LED circuit 240 is more than the voltage value required for lighting the light emitting diode element. Accordingly, the LED circuit 220, the LED circuit 230, and the LED circuit 240 are turned off, and only the LED circuit 210 is turned on.
The current flowing through the resistor R14, the resistor R23, and the resistor R24 is supplied from the transistor Q17 via the base terminals of the transistor Q12, the transistor Q21, and the transistor Q22.

The control circuit 150 detects an abnormality in the LED circuit 210 by detecting that the potentials of the wiring c ₂ , the wiring c ₃ , and the wiring c ₄ are lowered without changing the potential of the wiring c ₁ . The control circuit 150 turns off the switching element SW61, doubles the resistance value of the variable resistor VR72, and turns off the switching element SW18.

  FIG. 21 is a graph showing the potential of each part of the power supply device 100 according to this embodiment (when the LED circuit 210 is short-circuited abnormally, the switching element SW61 is off, and the switching element SW18 is off).

When the switching element SW18 is turned off, the transistor Q17, the transistor Q12, the transistor Q21, since the base current to the transistor Q22 is not supplied, decreases the potential of the wiring _{d 0} is the voltage of the DC voltage variable DC power supply E71 is generated The value goes up.
When the voltage V _D2 across the second input connection 112 reaches the total forward voltage drop of the second input connection 112, the base current is supplied to the transistors Q21 and Q22 via the second input connection 112. look like, since the transistor Q21 and the transistor Q22 is turned on, the potential of the wiring _{d 0} is recovered, it stabilized.
As a result, the LED circuit 230 and the LED circuit 240 are turned on. At this time, the current I ₃ flowing through the LED circuit 230 and the current I ₄ flowing through the LED circuit 240 are substantially the same due to the action of the current mirror circuit 110.

  That is, when the switching element SW18 is turned off, the operation of the current mirror circuit 110 is recovered and operates normally.

  Similarly, when a short circuit abnormality occurs in the LED circuit 230, the current mirror circuit 110 temporarily does not normally operate. However, when the control circuit 150 detects the abnormality and turns off the switching element SW28, the current mirror circuit 110 The operation of 110 is restored, and the operation becomes normal.

  If a short circuit abnormality occurs in the LED circuit 220 or the LED circuit 240, or if a disconnection abnormality occurs in any of the LED circuit 210 to the LED circuit 240, the current mirror circuit 110 operates normally, so the switching element SW18 or The switching element SW28 does not have to be turned off, but may be turned off. This is because even when either the switching element SW18 or the switching element SW28 is turned off, the current mirror circuit 110 operates normally.

Next, the operation at the time of power failure will be described.
At the time of a power failure, even if any of the LED circuits 210 to 240 is out of order, all the LED circuits 210 to 240 that can be turned on are to be turned on.
For example, the control circuit 150 detects a power failure by measuring a voltage from a commercial power source.
When the power failure is detected, the control circuit 150 turns on both the switching element SW61 and the switching element SW62 regardless of whether or not the abnormality is detected in the LED circuits 210 to 240. However, the control circuit 150 does not change the state of the switching element SW18 or the switching element SW28. Therefore, when the switching element SW18 or the switching element SW28 is turned off due to the abnormality detection, the switching element SW18 or the switching element SW28 remains off.

FIG. 22 is a graph showing the potential of each part of the power supply device 100 in this embodiment (when the LED circuit 210 is short-circuited abnormally, the switching element SW18 is off, and the switching element SW61 is on).
LED by short-circuit abnormality of the circuit 210 small voltage across _{V LED1} of the LED circuit 210, a collector minute transistors Q11 - although emitter voltage _{V CE1} is high, the switching element SW18 is turned off, the current mirror circuit 110 operates normally To do.
The base current is supplied from the second input connection unit 112 to the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22, and flows through the LED circuit 210, the current I ₁ that flows through the LED circuit 210, the current I ₂ that flows through the LED circuit 220, and the LED circuit 230. The current I ₃ and the current I ₄ flowing through the LED circuit 240 are substantially the same.

  Thereby, all the LED circuits 210-240 which can be lighted at the time of a power failure can be lighted.

  According to the power supply apparatus 100 in this embodiment, even if a short circuit abnormality occurs in the first load circuit (LED circuit 210), there is an effect that the current mirror circuit 110 operates normally.

  According to the power supply device 100 in this embodiment, even if a short circuit abnormality occurs in the second load circuit (LED circuit 230), there is an effect that the current mirror circuit 110 operates normally.

  According to the power supply device 100 in this embodiment, even when a short circuit abnormality occurs in the LED circuit 210 or the LED circuit 230, there is an effect that all the LED circuits 210 to 240 that can be turned on can be turned on at the time of a power failure. .

Embodiment 7 FIG.
The seventh embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 23 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 6, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

  The current mirror circuit 110 includes a resistor R19 (current limiting element) and a resistor R29 (current limiting element) instead of the switching element SW18 and the switching element SW28.

Between the wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion), a series circuit (first input connection portion 111) of the base-emitter of the transistor Q17, the resistor R19, and the diode D15 is connected. Connected through.
Between the wiring c ₃ (second load connection portion) and the wiring b ₀ (common input connection portion), a series circuit (second input connection portion 112) of the base-emitter of the transistor Q27, the resistor R29, and the diode D25 is provided. Connected through.
The configuration of the first input connection unit 111 and the configuration of the second input connection unit 112 may be different.

FIG. 24 is a graph showing the voltage-current characteristics of the first input connection portion 111 in this embodiment.
The horizontal axis represents the voltage V _D1 at both ends of the first input connection portion 111 (potential difference between the wiring c ₁ and the wiring b ₀ ). The vertical axis represents the output current I _D1 (emitter current of the transistor Q17) of the first input connection portion 111.

Voltage across _{V D1} of the first input connection 111, the base of the transistor Q17 - the voltage drop _{V BE17} between the emitter, the voltage drop _{V 15} of diode D15, which is the sum of the voltage drop _{V 19} of the resistor R19. When the voltage V _D1 is smaller than the sum of the forward drop voltage between the base and emitter of the transistor Q17 and the forward drop voltage of the diode D15, the current I _D1 is almost zero because both the transistor Q17 and the diode D15 are off. When the voltage V _D1 is larger than the sum of the forward drop voltage between the base and emitter of the transistor Q17 and the forward drop voltage of the diode D15, the transistor Q17 and the diode D15 are turned on, and a current I _D1 flows. Since the voltage drop _{V 19} of the resistor R19 is proportional to the current _{I D1,} the current _{I D1} increases, the voltage _{V D1} also increases.

  FIG. 25 is a graph diagram (at the time of LED circuit 210 short-circuit abnormality) showing the potential of each part of the power supply device 100 in this embodiment.

By abnormality occurs shorted to LED circuit 210, the voltage across _{V LED1} of the LED circuit 210 decreases the potential of the wiring _{c 1} is increased. Since the voltage V _D1 across the first input connection 111 increases, the output current I _{D1 of} the first input connection 111 increases. Transistors Q11, transistor Q12, transistor Q21, since the base current of the transistor Q22 increases, transistors Q11, transistor Q12, transistor Q21, the emitter current of the transistor Q22 increases, up the potential of the wiring _{d 0} is a variable DC power supply E71 is Reduce the voltage value of the DC voltage to be generated.

In this example, among the LED circuit 220, the LED circuit 230, and the LED circuit 240, the LED circuit 220 having the highest voltage at both ends during lighting is likely to be unlit first.
LED circuit 220 is subjected becomes unlit, the current _{I 2} flowing through the LED circuit 220 is decreased, the collector current of the transistor Q12 decreases. Since the base-emitter voltage of the transistor Q12 is constant, the emitter current of the transistor Q12 does not change, and the decrease in the collector current is compensated by the base current.

Since the transistor Q12 pulls more base current, the share of the other transistors Q11, Q21, and Q22 decreases, and the base current decreases. As a result, transistors Q11, the transistor Q21, since the emitter current of the transistor Q22 is returned to normal, even the return to normal potential of the wiring d _0, the voltage value of the DC voltage variable DC power supply E71 is generated, more falls that There is no.
Therefore, the current I ₂ flowing through the LED circuit 220 is reduced by the same amount as the increase in the output current I _D1 due to the increase in the voltage V _D1 at both ends of the first input connection portion 111, but it is not turned off.

If the increase in the output current I _D1 accompanying the increase in the voltage V _D1 across the first input connection 111 can be ignored, the currents flowing through the LED circuits 210 to 240 are substantially equal.

  Similarly, when a short circuit abnormality occurs in the LED circuit 230, there is no LED circuit that does not light up, and the currents flowing through the LED circuits 210 to 240 are substantially equal.

  Therefore, the current mirror circuit 110 operates normally and the guide light can be lit even when a part of the LED circuits is turned off due to the abnormality detection and when it is desired to turn on all the LED circuits that can be turned on by the power failure detection.

  According to the power supply device 100 in this embodiment, even when a short circuit abnormality occurs in the first load circuit (LED circuit 210) or the second load circuit LED circuit 230, the current mirror circuit 110 is operated normally. There is an effect that it operates.

Embodiment 8 FIG.
An eighth embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 26 is an electric circuit diagram showing another example of the configuration of the electric circuit of the guide lamp device 800 according to this embodiment.
The current mirror circuit 110 includes a transistor Q31, a transistor Q32, a resistor R33, a resistor R34, and a resistor R35 as the first input connecting portion 111, and a transistor Q41, a transistor Q42, a resistor as the second input connecting portion 112. A resistor R43, a resistor R44, and a resistor R45.

The wiring c ₁ (first load connection portion) and the wiring b ₀ (common input connection portion) are connected via a resistor-R33, a resistor R34, and a base-emitter series circuit of the transistor Q32. The transistor Q31 has a base terminal connected to a connection point between the resistors R33 and R34, an emitter terminal connected to a connection point between the resistor R34 and the base terminal of the transistor Q32, and a collector terminal connected to the wiring a. Connected to ₀ . Further, between the collector terminal of the wiring a ₀ and transistor Q32 is connected through a resistor R35.
The wiring c ₃ (second load connection portion) and the wiring b ₀ (common input connection portion) are connected via a resistor-R43, a resistor R44, and a base-emitter series circuit of the transistor Q42. The transistor Q41 has a base terminal connected to a connection point between the resistors R43 and R44, an emitter terminal connected to a connection point between the resistor R44 and the base terminal of the transistor Q42, and a collector terminal connected to the wiring a. Connected to ₀ . Further, between the collector terminal of the wiring a ₀ and transistor Q42 is connected through a resistor R45.
In addition, the structure of the 1st input connection part 111 and the structure of the 2nd input connection part 112 may differ.

FIG. 27 is a graph showing the voltage-current characteristics of the first input connection portion 111 in this embodiment.
The horizontal axis represents the voltage V _D1 at both ends of the first input connection portion 111 (potential difference between the wiring c ₁ and the wiring b ₀ ). The vertical axis represents the output current I _D1 (emitter current of the transistor Q32) of the first input connection portion 111.

The voltage V _D1 across the first input connection 111 is the sum of the drop voltage V33 of the resistor R33 and the drop voltage V34 of the resistor R34 and the drop voltage _VBE32 between the base and emitter of the transistor Q32. When the voltage V _D1 is lower than the forward drop voltage between the base and the emitter of the transistor Q32, the current I _D1 is almost zero because the transistor Q32 is off. When the voltage V _D1 is higher than the forward drop voltage between the base and the emitter of the transistor Q32, the transistor Q32 is turned on and a current I _D1 flows.

Output current _{I D1} of the first input connection 111, and the collector current _{I C32} of the transistor Q32, the current _{I 34} flowing through the resistor R34, which is the sum of the emitter current _{I E31} of the transistor Q31.
Since current _IC32 is limited by resistor R35, it is substantially constant when transistor Q32 is on.
When the voltage V ₃₄ is lower than the forward drop voltage between the base and the emitter of the transistor Q31, the current _IE31 is almost zero because the transistor Q31 is off. At this time, the voltage _{V 34} is determined by the division ratio of the resistor R33 and the resistor R34.
Voltage _{V 34,} the base of the transistor Q31 - reaches the forward voltage drop between the emitter, the transistor Q31 is turned on, a current _{I E31} flows.

  Since the voltage / current characteristics of the first input connection portion 111 can be freely set by changing the resistance values of the resistor R33, the resistor R34, and the resistor R35, the transistor Q32 is turned on at the normal time and the short-circuit abnormality, and the transistor Q31 is turned on. Set in advance to be in the off state.

As described in the seventh embodiment, when a short circuit abnormality occurs in the LED circuit 210, the difference between the current flowing in the LED circuit 210 to the LED circuit 240 is the same as the increase in the current I _D1 due to the increase in the voltage V _D1. Can do.
Therefore, in order to reduce this difference, the increase in current I _D1 accompanying the increase in voltage V _D1 may be reduced.

On the other hand, if it is attempted to turn on all LED circuits that can be turned on, for example, by detecting a power failure at the time of disconnection abnormality, it is necessary to supplement the current I _D1 with the same amount of current that was flowing through the disconnected LED circuit.
When the relationship between the voltage V _D1 and the current I _D1 is linear and the increase in the current I _D1 due to the increase in the voltage V _D1 is small, in order to compensate for the same amount of current as that flowing through the disconnected LED circuit, The voltage V _D1 must be made quite high.

On the other hand, when the first input connection portion 111 has the voltage-current characteristic as shown in FIG. 27, when the short circuit is abnormal, the increase in the current I _D1 accompanying the increase in the voltage V _D1 is small. The difference in current flowing through 210 to 240 is small. Further, when the disconnection is abnormal, the voltage value of the DC voltage generated by the variable DC power source E71 is increased, the voltage V _D1 is increased, and the transistor Q31 is turned on to compensate for the current flowing through the disconnected LED circuit. Therefore, the voltage V _D1 need not be so high.
The same applies to the second input connection unit 112.

  Therefore, the current mirror circuit 110 operates normally and the guide light can be lit even when a part of the LED circuits is turned off due to the abnormality detection and when it is desired to turn on all the LED circuits that can be turned on by the power failure detection.

  According to the power supply device 100 in this embodiment, when normal, when a short circuit is abnormal (when partly extinguished due to abnormality detection and when all lighting is caused by power failure detection), when abnormal disconnection occurs (when partly extinguishes due to abnormality detection and when power failure is detected) In any case, the current mirror circuit 110 operates normally.

Embodiment 9 FIG.
The ninth embodiment will be described with reference to FIGS.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 28 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 4, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

Transistor Q11, transistor Q12, transistor Q21, and transistor Q22 are enhancement type N-channel MOS-FETs.
The transistor Q11 (first transistor element) has a drain terminal connected to the wiring c ₁ (first load connection portion), a gate terminal connected to the wiring b ₀ (common input connection portion), and a source terminal connected to the wiring e _1. Yes.
The transistor Q12 (third transistor element) has a drain terminal connected to the wiring c ₂ (third load connection portion), a gate terminal connected to the wiring b ₀ (common input connection portion), and a source terminal connected to the wiring e _2. Yes.
The transistor Q21 (first transistor element) has a drain terminal connected to the wiring c ₃ (second load connection portion), a gate terminal connected to the wiring b ₀ (common input connection portion), and a source terminal connected to the wiring e _3. Yes.
The transistor Q22 (third transistor element or sixth transistor element) has a drain terminal connected to the wiring c ₄ (third load connection section or fourth load connection section) and a gate terminal connected to the wiring b ₀ (common input connection section). to, and source terminal connected to the wiring e _4.

The current mirror circuit 110 further includes a resistor R20.
The resistor R20 has one end connected to the wiring b ₀ (common input connection portion) and the other end grounded.
The resistor R20 is a pull-down resistor for preventing the potential of the wiring b ₀ (common input connection portion) from becoming unstable when both the diode D15 and the diode D25 are off.

As described above, when bipolar transistors are used as the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22, a difference corresponding to the base current is generated between the currents flowing through the LED circuits 210 to 240.
On the other hand, since the transistor Q11, transistor Q12, transistor Q21, and transistor Q22 are MOS-FETs, the gate current is almost zero, and there is no difference between the currents flowing through the LED circuits 210-240.

Further, since the transistor Q11, the transistor Q12, the transistor Q21, and the transistor Q22 are enhancement types, they are turned on when the voltage between the gate and the source is about 2.5V, for example. This is larger than a base-emitter voltage (for example, 0.7 V) at which a general bipolar transistor is turned on.
For example, when the diode D15 is that it turned on, the potential difference between the wiring _{c 1} and the wiring _{e 1} is the forward drop voltage of the diode D15 (for example 0.7 V), the gate of the transistor Q11 - source voltage (e.g., 2.5V ) (For example, 3.2 V).

Since the potential difference between the wiring c ₁ and the wiring e ₁ is large, the current mirror circuit 110 operates normally even when the voltage variation between the LED circuit 210 to the LED circuit 240 is large. Further, if the potential difference between the wiring c ₁ and the wiring e ₁ is larger than the forward voltage drop of one light emitting diode element constituting the LED circuit 210, even if a short circuit abnormality occurs in the LED circuit 210, The current mirror circuit 110 operates normally.

FIG. 29 is an electric circuit diagram showing another example of the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
This example is different in that the switching element SW61 and the switching element SW62 are on the upstream side (the higher potential side) than the LED circuit 210 to the LED circuit 240 and the current mirror circuit 110.

  When NPN bipolar transistors are used as the transistor Q11, transistor Q12, transistor Q21, and transistor Q22, when some LED circuits are turned off due to abnormality detection, the base current of the transistor element corresponding to the turned off LED circuit is cut off. The switching element SW61 and the switching element SW62 need to be on the downstream side (low potential side) from the current mirror circuit 110.

  On the other hand, when MOS-FETs are used as the transistor Q11, transistor Q12, transistor Q21, and transistor Q22, the gate current is essentially zero, so the switching element SW61 and the switching element SW62 are provided upstream of the current mirror circuit 110. be able to.

Since the switching element SW61 and the switching element SW62 are upstream of the current mirror circuit 110, for example, when a short circuit abnormality occurs in the LED circuit 210, the switching element SW61 is turned off, and the LED circuit 210 and the LED circuit 220 are turned off. , the potential of the wiring _{c 1} is lowered, the diode D15 is turned off.
Therefore, even if the decrease width in which the voltage V _LED1 across the LED circuit 210 decreases due to the short circuit abnormality is larger than the sum of the forward drop voltage of the diode D15 and the gate-source voltage of the transistor Q11, the current mirror circuit. 110 operates normally.

Further, when the switching element SW61 and the switching element SW62 are on the downstream side of the current mirror circuit 110, the switching element SW61 or the switching element SW62 is turned off due to failure detection or the like, and the current flowing through the LED circuit 210 or the LED circuit 230 is 0. If it becomes, because the voltage drop across the LED circuit 210 or LED circuit 230 is eliminated, the potential of the wiring _{c 1} or the wiring _{c 3} becomes high, the current mirror circuit 110 is likely to malfunction.
In contrast, if the switching element SW61 and the switching element SW62 is on the upstream side of the current mirror circuit 110, if you turn off the switching element SW61 or switching element SW62, the potential of the wiring _{c 1} or the wiring _{c 3} becomes lower The current mirror circuit 110 operates normally.
Therefore, the switching element SW61 and the switching element SW62 are preferably on the upstream side of the current mirror circuit 110.

  According to the power supply device 100 in this embodiment, the gate currents of the first transistor element (transistor Q11), the second transistor element (transistor Q21), and the third transistor element (transistor Q12 or transistor Q22) are almost zero. Therefore, the currents flowing through the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240) can be substantially equalized. There is an effect.

  According to the power supply device 100 in this embodiment, the gate transistor when the first transistor element (transistor Q11), the second transistor element (transistor Q21), and the third transistor element (transistor Q12 or transistor Q22) are on- Since the source-to-source voltage is relatively high, variations in voltage across the first load circuit (LED circuit 210), the second load circuit (LED circuit 230), and the third load circuit (LED circuit 220 or LED circuit 240) Even when the current is large, the current mirror circuit 110 operates normally.

  In this example, an N-channel MOS-FET is used, but a P-channel MOS-FET may be used.

Embodiment 10 FIG.
The tenth embodiment will be described with reference to FIG.
Since the appearance of the guide light device 800 in this embodiment is the same as that described in the first embodiment, the description thereof is omitted here.

FIG. 30 is an electric circuit diagram showing the configuration of the electric circuit of the guide lamp device 800 in this embodiment.
In addition, about the part which is common in the guide light apparatus 800 demonstrated in Embodiment 9, the same code | symbol is attached | subjected and description is abbreviate | omitted here.

Control circuit 150 for detecting an abnormality of the LED circuit 210-240, lines _{c 1,} lines _{c 2,} lines _{c 3,} rather than the potential of the wiring _{c 4,} lines _{e 1,} lines _{e 2,} lines _{e 3,} wire e Measure the potential of ₄ .

Since MOS-FETs (insulated field effect transistors) are used as the transistors Q11, Q12, Q21, and Q22, the source currents of the transistors Q11 to Q22 are substantially equal to the drain currents.
As the potential of the wiring _{d 0} is constant, since the DC voltage variable DC power supply E71 is generated is controlled, the wiring _{e 1,} lines _{e 2,} lines _{e 3,} the potential of the wiring _{e 4} are resistors R13 , And are determined by the voltage drop in each of the resistor R14, the resistor R23, and the resistor R24.
Therefore, by measuring the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ , the current flowing through the LED circuits 210 to 240 can be determined.

When there is no abnormality in the LED circuits 210 to 240, or when the LED circuit 220 or the LED circuit 240 is short-circuited, the current mirror circuit 110 operates normally, and the currents flowing through the LED circuits 210 to 240 become almost equal. In this case, the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ are substantially equal.
When the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ are within a predetermined range, the control circuit 150 determines that there is no abnormality in the LED circuits 210 to 240.

On the other hand, if any of the LED circuits 210 to 240 is disconnected, the current flowing through the disconnected LED circuit becomes 0. Therefore, any of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ only the potential is lowered, approximately equal to the potential of the wiring d _0.
When only one of the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ becomes low, the control circuit 150 determines that the corresponding LED circuit 210 to 240 has failed.

In addition, when one of the LED circuit 210 and the LED circuit 230 is short-circuited, the current mirror circuit 110 operates normally if the forward voltage drop decreased by the short-circuit failure is within the allowable range of the current mirror circuit 110. Since the currents flowing through the LED circuits 210 to 240 are substantially equal, the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ are substantially equal. Therefore, the control circuit 150 determines that there is no abnormality in the LED circuits 210-240.

On the other hand, when one of the LED circuit 210 and the LED circuit 230 has a short circuit failure and the forward drop voltage decreased due to the short circuit failure exceeds the allowable range of the current mirror circuit 110, the LED circuit 210 Since the currents flowing through ˜240 are uneven, the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ vary.
When the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ vary, the control circuit 150 determines that either the LED circuit 210 or the LED circuit 230 has a short circuit failure.

When the forward drop voltage of the LED circuit 210 or the LED circuit 230 decreases due to a short circuit failure, the corresponding voltage is applied to the transistor Q11 or the transistor Q21, and the drain-source voltage increases. When the drain-source voltage of the MOS-FET operating in the saturation region increases, the drain current (= source current) increases due to the channel length modulation effect.
For this reason, for example, when the LED circuit 210 has a short circuit failure, the potential of the wiring e ₁ becomes higher than the potential of the wiring e ₃ . Conversely, when the LED circuit 230 has a short circuit failure, the potential of the wiring e ₃ becomes higher than the potential of the wiring e ₁ .
When the control circuit 150 determines that either the LED circuit 210 or the LED circuit 230 has a short circuit failure, the control circuit 150 further compares the potential of the wiring e _{1 and} the potential of the wiring e ₃ to thereby determine the LED circuit 210 and the LED circuit. It is determined which of 230 has a short circuit failure.

  The control circuit 150 determines whether the LED circuits 210 to 240 are normal or abnormal as described above, and controls the switching element SW61, the switching element SW62, and the variable resistor VR72 based on the determination result. Since the contents of the control are the same as those described in the first to ninth embodiments, the description thereof is omitted here.

As described above, the control circuit 150 detects abnormalities in the LED circuits 210 to 240 by measuring each potential of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ .
When a disconnection abnormality occurs in the LED circuits 210 to 240, the light emitting diode element of the disconnected LED circuit cannot be lit. The control circuit 150 detects an abnormality and turns off the light emitting diode element of the LED circuit.
When a short circuit abnormality occurs in the LED circuits 210 to 240, the light emitting diode elements can be turned on, including the LED circuit in which the short circuit abnormality has occurred, as long as the current mirror circuit 110 can be operated normally. In this case, the control circuit 150 does not regard it as abnormal, and continues to turn on the light emitting diode element of the LED circuit as a normal state.
When a short circuit abnormality occurs in the LED circuits 210 to 240 and the current mirror circuit 110 exceeds a range in which the current mirror circuit 110 can operate normally, the light emitting diode elements of all the LED circuits cannot be turned on. The control circuit 150 detects the abnormality, turns off the switching element SW61 or the switching element SW62, turns off the panel unit 830 on the side where the LED circuit in which the short circuit abnormality has occurred, and disconnects the LED circuit in which the short circuit abnormality has occurred. The lighting of the panel unit 830 on the opposite side is continued.

  In this way, some short-circuit abnormalities are not determined to be abnormal, but are regarded as normal, and if normal lighting is possible, lighting is continued, and only when the LED unit 831 must be replaced by necessity, the panel unit 830. Turn off and notify the user.

Further, when the abnormality of the LED circuits 210 to 240 is determined by measuring the potentials of the wiring c ₁ , the wiring c ₂ , the wiring c ₃ , and the wiring c ₄ , the forward voltage drop of the LED circuits 210 to 240 is different. Therefore, it is not possible to determine whether the wiring is normal or abnormal just by measuring the potentials of the wiring c ₁ , the wiring c ₂ , the wiring c ₃ , and the wiring c ₄ , and it is necessary to compare with the normal potential.
In contrast, the potentials of the wiring e ₁ , the wiring e ₂ , the wiring e ₃ , and the wiring e ₄ are determined by the current flowing through the LED circuits 210 to 240 regardless of the forward voltage drop of the LED circuits 210 to 240. The normal potential is known in advance. Therefore, it is not necessary to measure and store the normal potential, and the abnormality can be easily determined.

  As a method for discriminating between the disconnection abnormality and the short circuit abnormality, for example, there is the following method in addition to the above-described method.

In the case of the disconnection abnormality, the variable DC power supply E71 generates the same current as the sum of the currents flowing through the four LED circuits 210 to 240 to the other three LED circuits except the disconnected LED circuit. Increase the DC voltage.
On the other hand, in the case of a short circuit abnormality, the forward voltage drop of the LED circuit 210 or the LED circuit 230 decreases and the potential of the wiring c ₁ or the wiring c ₃ rises, so that more current tends to flow than normal. Therefore, the variable DC power supply E71 reduces the generated DC voltage.
Therefore, the control circuit 150, that, for example, by measuring the potential of the wiring a _0, if it is determined whether the variable DC power supply E71 is lowered or raised the DC voltage generator, to determine the abnormal short circuit and disconnection abnormality Can do.

FIG. 3 is a perspective view showing a usage mode of the guide light device 800 in the first embodiment. FIG. 3 is a three-sided view illustrating an appearance of the guide light device 800 according to the first embodiment. FIG. 4 is an exploded view showing a configuration of panel unit 830 in the first embodiment. FIG. 3 is an electric circuit diagram illustrating a configuration of an electric circuit of the guide light device 800 according to the first embodiment. FIG. 3 is a graph showing the potential of each part of power supply device 100 according to Embodiment 1 (normal time). FIG. 3 is a graph showing the potential of each part of the power supply device 100 according to Embodiment 1 (when the LED circuit 220 is disconnected). FIG. 3 is a graph showing the potential of each part of the power supply device 100 according to Embodiment 1 (when the LED circuit 210 is disconnected). FIG. 6 is an electric circuit diagram showing a configuration of an electric circuit of a guide lamp device 800 in the second embodiment. The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 2 (at the time of normal). FIG. 9 is a graph showing the potential of each part of the power supply device 100 according to Embodiment 2 (when the LED circuit 210 is disconnected). FIG. 6 is an electric circuit diagram illustrating a configuration of an electric circuit of a guide lamp device 800 according to Embodiment 3. FIG. 6 is an electric circuit diagram showing a configuration of an electric circuit of a guide light device 800 in a fourth embodiment. FIG. 9 is a graph showing the potential of each part of power supply device 100 according to Embodiment 4 (when normal). FIG. 10 is an electric circuit diagram showing another example of the configuration of the electric circuit of the guide lamp device 800 in the fourth embodiment. FIG. 14 is an electric circuit diagram showing still another example of the configuration of the electric circuit of the guide lamp device 800 according to the fourth embodiment. FIG. 10 is an electric circuit diagram illustrating a configuration of an electric circuit of a guide light device 800 according to a fifth embodiment. The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 5 (at the time of LED circuit 220 short circuit abnormality). The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 5 (at the time of LED circuit 210 short circuit abnormality). FIG. 10 is an electric circuit diagram illustrating a configuration of an electric circuit of a guide light device 800 according to a sixth embodiment. The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 6 (at the time of LED circuit 210 short circuit abnormality). The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 6 (LED circuit 210 short circuit abnormality, switching element SW61 off, and switching element SW18 off). The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 6 (LED circuit 210 short circuit abnormality, switching element SW18 off, and switching element SW61 on). FIG. 18 is an electric circuit diagram illustrating a configuration of an electric circuit of a guide light device 800 according to a seventh embodiment. FIG. 18 is a graph showing voltage-current characteristics of the first input connection portion 111 in the seventh embodiment. The graph figure which shows the electric potential of each part of the power supply device 100 in Embodiment 7 (at the time of LED circuit 210 short circuit abnormality). FIG. 25 is an electric circuit diagram illustrating another example of the configuration of the electric circuit of the guide light device 800 according to the eighth embodiment. FIG. 20 is a graph showing voltage-current characteristics of the first input connection portion 111 in the eighth embodiment. FIG. 10 is an electric circuit diagram illustrating a configuration of an electric circuit of a guide light device 800 according to a ninth embodiment. FIG. 25 is an electric circuit diagram illustrating another example of the configuration of the electric circuit of the guide light device 800 according to the ninth embodiment. FIG. 40 is an electric circuit diagram showing a configuration of an electric circuit of guide light apparatus 800 in the tenth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Power supply device, 110 Current mirror circuit, 111 1st input connection part, 112 2nd input connection part, 150 Control circuit, 210, 220, 230, 240 LED circuit, 800 Guide light apparatus, 810 Main body, 820 Power supply unit, 830 Panel unit, 831 LED unit, 835 light guide plate, 838 guide light display plate, D15, D16, D25, D26 diode, E71 variable DC power supply, Q11, Q12, Q17, Q21, Q22, Q27, Q31, Q32, Q41, Q42 Transistor, R13, R14, R19, R20, R23, R24, R29, R33, R34, R35, R43, R44, R45 resistor, SW18, SW28, SW61, SW62 switching element, VR72 variable resistor.

Claims (16)

DC voltage is supplied to the first load circuit, the second load circuit, and the third load circuit, the current flowing through the first load circuit, the current flowing through the second load circuit, and the third load In the power supply device that makes the current flowing through the circuit substantially uniform,
A first transistor element;
A second transistor element;
A third transistor element;
A first load connection for connecting a collector terminal or drain terminal of the first transistor element to the first load circuit;
A second load connection for connecting the collector terminal or drain terminal of the second transistor element to the second load circuit;
A third load connection for connecting the collector terminal or drain terminal of the third transistor element to the third load circuit;
A common input connection for connecting base terminals or gate terminals of the first transistor element, the second transistor element, and the third transistor element to each other;
A first input connection for connecting the first load connection and the common input connection;
A power supply apparatus comprising: a second input connection portion that connects the second load connection portion and the common input connection portion.   The power supply apparatus according to claim 1, wherein the second input connection unit connects the second load connection unit and the common input connection unit via a diode element.   The power supply apparatus according to claim 2, wherein the first input connection portion connects the first load connection portion and the common input connection portion via a diode element.   4. The power supply according to claim 2, wherein the second input connection portion connects the second load connection portion and the common input connection portion via a plurality of diode elements connected in series. 5. apparatus. The first input connection portion includes a fourth transistor element having a base terminal or a gate terminal connected to the first load connection portion side and an emitter terminal or a source terminal connected to the common input connection portion side. ,
The second input connection portion includes a fifth transistor element having a base terminal or a gate terminal connected to the second load connection portion side and an emitter terminal or a source terminal connected to the common input connection portion side. The power supply device according to any one of claims 1 to 4, wherein the power supply device is provided. The first input connection unit further connects the first load connection unit and the common input connection unit via a current limiting element,
The said 2nd input connection part further connects the said 2nd load connection part and the said common input connection part via a current limiting element, The one of Claim 1 thru | or 5 characterized by the above-mentioned. Power supply. The power supply device further includes:
A current detector that detects a sum of a current flowing through the first load circuit, a current flowing through the second load circuit, and a current flowing through the third load circuit;
DC voltage is supplied to the first load circuit, the second load circuit, and the third load circuit, and the supplied DC voltage is adjusted so that the sum of the currents detected by the current detector is constant. The power supply device according to claim 1, further comprising: a direct current power supply circuit that performs the operation. The power supply device further includes:
A first abnormality detector for detecting an abnormality in the first load circuit;
The first switching element that cuts off the supply of DC voltage to the first load circuit when the first abnormality detection unit detects an abnormality of the first load circuit. The power supply device according to claim 7. The first transistor element is an insulating field effect transistor,
The power supply device according to claim 8, wherein the first abnormality detection unit detects an abnormality of the first load circuit by measuring a potential of a source terminal of the first transistor element. The power supply device further includes:
A second abnormality detector for detecting an abnormality in the second load circuit;
2. The second switching element for cutting off the supply of DC voltage to the second load circuit when the second abnormality detection unit detects an abnormality of the second load circuit. The power supply device according to claim 9. The first input connection unit cuts off the connection between the first load connection unit and the common input connection unit when the first abnormality detection unit detects an abnormality of the first load circuit. The power supply device according to claim 8 or 9. The second input connection unit is configured to block the connection between the second load connection unit and the common input connection unit when the second abnormality detection unit detects an abnormality of the second load circuit. The power supply device according to claim 10. The power supply device further includes:
A sixth transistor element having a base terminal or a gate terminal connected to the common input connection;
A fourth load connection portion for connecting a collector terminal or a drain terminal of the sixth transistor element to a fourth load circuit;
The first abnormality detection unit further detects an abnormality in the third load circuit,
The first switching element is
When the first abnormality detection unit detects an abnormality in the first load circuit and an abnormality in the third load circuit, the DC voltage to the first load circuit and the third load circuit The power supply apparatus according to claim 8 or 9, wherein the supply of power is cut off. The power supply device further includes:
A sixth transistor element having a base terminal or a gate terminal connected to the common input connection;
A fourth load connection portion for connecting a collector terminal or a drain terminal of the sixth transistor element to a fourth load circuit;
The second abnormality detection unit further detects an abnormality in the fourth load circuit,
The second switching element is
DC voltage to the second load circuit and the fourth load circuit when the second abnormality detection unit detects an abnormality of the second load circuit and an abnormality of the fourth load circuit. The power supply device according to claim 10, wherein the supply of power is cut off. A first light emitting diode circuit in which one or more light emitting diode elements are connected in series;
A second light emitting diode circuit in which one or more light emitting diode elements are connected in series;
A third light emitting diode circuit in which one or more light emitting diode elements are connected in series;
The first light emitting diode circuit is the first load circuit, the second light emitting diode circuit is the second load circuit, and the third light emitting diode circuit is the third load circuit. Item 15. A light-emitting diode lighting device comprising the power supply device according to any one of Items 14 to 14. A first light emitting diode circuit in which one or more light emitting diode elements are connected in series;
A second light emitting diode circuit in which one or more light emitting diode elements are connected in series;
A third light emitting diode circuit in which one or more light emitting diode elements are connected in series;
A fourth light emitting diode circuit in which one or more light emitting diode elements are connected in series;
The first light emitting diode circuit is the first load circuit, the second light emitting diode circuit is the second load circuit, the third light emitting diode circuit is the third load circuit, and the fourth light emitting diode is used. The power supply device according to claim 13 or 14, wherein a circuit is the fourth load circuit,
A first guide light display board that shines by light emitted by the first light emitting diode circuit and the third light emitting diode circuit;
A guide lamp device comprising: a second guide lamp display panel that emits light by light emitted from the second light emitting diode circuit and the fourth light emitting diode circuit.

Images