JP2007288978A - Power supply apparatus and electrodeless discharge lamp lighting device, lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply apparatus and electrodeless discharge lamp lighting device, lighting fixture that prevents malfunctions due to usage beyond the end of service life. <P>SOLUTION: A series circuit for two voltage dividing resistances R11, R12 is connected between output ends of a main circuit E, and a wire break portion 30 at the end of service life is inserted between the one voltage dividing resistance R11 and the terminal end on the high-voltage side of the main circuit E. A detection voltage Vm, obtained by dividing an output voltage Vdc of the main circuit E by voltage-dividing resistances R11, R12, is input to a controller 100. The purpose of the controller 100 is to perform a feedback control (PWM control), to adjust on-duty ratio of a drive signal output from a drive circuit 2 so that the detection voltage Vm becomes a desired value. The controller 100 causes the output of the drive signal generated by the drive circuit 2 to be stopped, when the wire break portion 30 at the end of service life is broken and a detection voltage Vm becomes zero, and at the same time, causes the operations of both the main circuit E and a power conversion circuit 9 to be stopped, by causing the output of the drive signal generated by the drive circuit 16 to be stopped. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power supply device, an electrodeless discharge lamp lighting device, and a lighting fixture.

Conventionally, a main circuit part that converts a direct current or alternating current input into a desired direct current or alternating current output, and a plurality of circuit parts constituting the main circuit part are mounted, and a conductor pattern serving as an electrical wiring between the circuit parts is provided. There is provided a power supply device including a printed wiring board formed on the surface and a case formed in a box shape and containing the printed wiring board therein and filled with urethane resin (see, for example, Patent Document 1). .
Japanese Patent Laid-Open No. 9-46072

  By the way, when the power supply device is used beyond the life of the circuit parts, not only the performance deteriorates, but there is a possibility that the circuit parts may abnormally generate heat or cause problems such as adversely affecting the load. .

  This invention is made | formed in view of the said situation, The objective is to provide the power supply device which can prevent generation | occurrence | production of the malfunction by use beyond the lifetime, an electrodeless discharge lamp lighting device, and a lighting fixture.

  In order to achieve the above object, the invention according to claim 1 is provided with a main circuit part for converting a DC or AC input into a desired DC or AC output and a plurality of circuit components constituting the main circuit part. And a printed wiring board having a conductor pattern formed on the surface as electrical wiring between each circuit component, and a case formed in a box shape and containing the printed wiring board therein and filled with urethane resin In one or a plurality of places where a DC voltage is applied in the conductor pattern, a life-time disconnection portion is provided in which deterioration with time is relatively easy to proceed and disconnection due to deterioration at the end of the life is provided. Features.

  According to a second aspect of the present invention, in the first aspect of the invention, a portion of the conductor pattern to which a DC voltage is applied is covered with an insulating protective film, the conductor pattern is crossed in the width direction, and the protective film The disconnection portion at the end of the lifetime is formed by a slit that does not exist.

  According to a third aspect of the present invention, in the first aspect of the invention, the disconnection portion at the time of life is formed by relatively narrowing a width dimension of the conductor pattern.

  According to a fourth aspect of the present invention, there is provided a control unit according to any one of the first to third aspects, wherein the control unit controls the operation of the main circuit unit and stops the operation of the main circuit unit when the disconnection unit at the end of life is disconnected. It is characterized by having.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the disconnection at the time of the lifetime in the vicinity of a circuit component having a relatively large calorific value among circuit components constituting the main circuit unit or the control unit. A part is provided.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the disconnection portion at the time of life is provided on a circuit component mounting surface side of the printed wiring board.

  According to a seventh aspect of the present invention, in the third aspect of the invention, the detection means for detecting the ambient temperature or humidity, and the conductor pattern in the disconnection portion at the time of the lifetime when the detection value of the detection means is less than or equal to a predetermined threshold value And a means for apparently narrowing the width dimension.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to sixth aspects, the lifetime disconnection occurs when the detection means for detecting the ambient temperature or humidity and the detection value of the detection means are below a predetermined threshold value. And means for increasing the DC voltage applied to the unit.

  The invention of claim 9 is the invention according to any one of claims 1 to 6, wherein the detecting means for detecting the ambient temperature or humidity, and a pair of electrodes arranged opposite to each other with the disconnection portion at the time of life in the width direction And a means for increasing the voltage applied between the electrodes when the detection value of the detection means is below a predetermined threshold value.

  According to a tenth aspect of the present invention, in the fifth aspect of the invention, the temperature detecting means for detecting the ambient temperature and the amount of heat generated by the heat generating component when the detected value of the temperature detecting means is equal to or lower than a predetermined threshold value. Means.

  According to an eleventh aspect of the present invention, in any one of the first to tenth aspects, a plurality of the disconnection portions at the time of life differing in the degree of progress of deterioration depending on temperature or humidity are provided.

  In order to achieve the above object, a power supply device according to any one of claims 1 to 11 and a high frequency power supply for converting DC power supplied from the power supply device into high frequency power. And an induction coil provided in the vicinity of the electrodeless discharge lamp and connected to the output terminal of the high-frequency power supply unit.

  In order to achieve the above object, the invention of claim 13 comprises the electrodeless discharge lamp lighting device according to claim 12 and a lamp socket for holding the electrodeless discharge lamp.

  According to the inventions of claims 1, 12 and 13, when the disconnection part at the time of life is disconnected, the power supply device, the electrodeless discharge lamp lighting device, and the lighting fixture do not operate normally, so that they are not used beyond the life. Thus, it is possible to provide a power supply device, an electrodeless discharge lamp lighting device, and a lighting fixture that can prevent the occurrence of problems due to use beyond the lifetime.

  According to the second aspect of the present invention, the life-time disconnection portion that is not protected by the protective film is deteriorated relatively quickly by the acid generated by hydrolysis of the urethane resin. In addition, it is possible to easily form a disconnection part at the time of life without adding circuit components.

  According to the invention of claim 3, the life-time disconnection portion formed by narrowing the width dimension of the conductor pattern is deteriorated relatively quickly by the acid generated by hydrolysis of the urethane resin. Therefore, it is possible to reliably disconnect the wire, and to easily form the disconnection portion at the time of life without adding circuit components.

  According to the invention of claim 4, since the control unit stops the operation of the main circuit unit when the disconnection part at the time of service life is disconnected, it is possible to more reliably prevent the occurrence of trouble due to use exceeding the service life.

  According to the invention of claim 5, since the deterioration of the disconnection portion at the time of life is accelerated by heat, the disconnection can be surely made when the lifetime is reached.

  According to the invention of claim 6, since the deterioration of the disconnection part at the time of life is accelerated by the moisture (humidity) in the air, the disconnection can be surely made when the service life is reached.

  According to the seventh to ninth aspects of the present invention, the width dimension of the conductor pattern at the life-time disconnection portion is apparently narrowed or applied to the life-time disconnection portion at a low temperature or low humidity that is equal to or lower than the threshold value. The DC voltage is increased, or the voltage applied between a pair of electrodes placed opposite each other with the broken part at the end of the life in the width direction is increased. The disconnection portion can be reliably disconnected.

  According to the invention of claim 10, since the amount of heat generated by the heat generating component in the vicinity of the disconnection part at the time of life is increased at a low temperature that is equal to or lower than the threshold value, before the part other than the disconnection part at the end of the life reaches the end of life. The disconnection part at the end of the life can be surely disconnected.

  According to the invention of claim 11, since the plurality of life-time disconnection portions having different degrees of deterioration depending on temperature or humidity are provided, other than the life-time disconnection portion under various temperature conditions and humidity conditions. Before the part reaches the end of its life, the disconnection part at the end of the life can be surely disconnected.

  Hereinafter, embodiments in which the technical idea of the present invention is applied to an electrodeless discharge lamp lighting device will be described in detail with reference to the drawings. However, the power supply device to which the technical idea of the present invention can be applied is not limited to the electrodeless discharge lamp lighting device.

(Embodiment 1)
FIG. 1 shows a circuit diagram of the electrodeless discharge lamp lighting device of the present embodiment. The electrodeless discharge lamp lighting device of the present embodiment has the same basic configuration as that disclosed in Japanese Patent Application Laid-Open No. 2005-158464, and creates a desired DC output from the AC output of the commercial AC power supply AC. Part E, a power conversion circuit 9 for converting the DC output of the main circuit part E into a high-frequency output and supplying it to the induction coil 5 arranged in the vicinity of the electrodeless discharge lamp 6, and power when starting the electrodeless discharge lamp 6 A start circuit 13 for starting the electrodeless discharge lamp 6 by gradually increasing the output voltage of the conversion circuit 9 and a voltage detection circuit 14 for detecting the output voltage (application voltage of the induction coil 5) Vx of the power conversion circuit 9 Prepare. The main circuit section E includes a rectifier circuit 10 that rectifies the AC output of the AC power supply AC, and a well-known booster that includes an inductor L10, a diode D10, a switching element Q6, a smoothing capacitor C10, and a driving circuit 2 that drives the switching element Q6. It consists of a chopper circuit. The power conversion circuit 9 includes a pair of switching elements Q3 and Q4 connected in series between the output ends of the main circuit portion E, and a resonance circuit including an inductor Ls and capacitors Cp and Cs is connected to the low-side switching element Q4. The so-called half-bridge type inverter circuit is configured to alternately switch a pair of switching elements Q3 and Q4 composed of field-effect transistors according to rectangular wave pulse drive signals V _DH and V _DL output from the drive circuit 16. Thus, a high frequency output is supplied to the induction coil 5 through the resonance circuit. The drive signal V _DH for driving the switching element Q3 and the drive signal V _DL for driving the switching element Q4 have a phase difference of about 180 degrees. The voltage detection circuit 14 includes a rectifying diode, a voltage dividing resistor, a smoothing capacitor, and the like, and outputs a detection voltage Vxs, which is a DC voltage corresponding to the output voltage Vx, to the starting circuit 13.

On the other hand, the starting circuit 13 has a capacitor C1 charged via the temperature-sensitive resistor R1 with an operating voltage Vd obtained by stepping down and stabilizing the output voltage Vdc of the main circuit section E, and an input resistor and a feedback resistor for the operational amplifier OP1. An error amplifier that amplifies the difference between the voltage Vc1 across the capacitor C1 and the detection voltage Vxs of the voltage detection circuit 14, a voltage dividing resistor R2 connected in parallel with the capacitor C1, and a capacitor C1. And the output voltage Vf according to the time constant (= the product of the resistance value of the resistor R1 and the capacitance value of the capacitor C1) of the charging circuit comprising the resistor R1 and the capacitor C1, as will be described later. It will gradually rise. The output voltage Vf of the starting circuit 13 is input to a driving circuit 16 composed of a voltage controlled oscillator (VCO). The driving circuit 16 drives the driving signals V _DH and V _DL in accordance with the increase of the output voltage Vf of the starting circuit 13. The frequency is gradually reduced.

In addition, a current detection circuit that detects a resonance current flowing in the resonance circuit, and a drive circuit 16 that controls the drive circuit 16 so that the output voltage Vx of the power conversion circuit 9 becomes a desired level with reference to the detection current of the current detection circuit. A control circuit 17 for changing the frequencies (operating frequencies) finv of the signals V _DH and V _DL is provided. The drive circuit 16 includes a first control output (first control current Isw) output from the start circuit 13, and a control circuit. The operating frequency finv is changed in accordance with the control output (control current) Io obtained by adding the second control output (second control current Ifb) output by the control unit 17.

The current detection circuit includes a detection resistor Rd connected between the low-side switching element Q4 constituting the power conversion circuit 9 and the circuit ground, and generates a high-frequency current flowing through the switching element Q4 (resonance current flowing through the resonance circuit). The corresponding detection voltage V _Rd is output to the control circuit 17.

The control circuit 17 is configured by connecting an input resistor or the like to the operational amplifier OP2, and an error amplifier (differential amplifier) that amplifies the difference between the reference voltage Vref and the detection voltage V _Rd of the current detection circuit, and the operational amplifier OP2 via the resistor. And a diode D2 having a cathode connected to the output terminal. In the operational amplifier OP2, the reference voltage Vref is input to the non-inverting terminal, and a delay circuit including a parallel circuit of a resistor R10 and a capacitor C11 is connected between the inverting terminal and the output terminal. Further, the cathode of the diode D1 is connected to the output terminal of the operational amplifier OP1 constituting the error amplifier of the starting circuit 13 via a resistor, and the anodes of these two diodes D1 and D2 are connected in parallel to the input terminal of the drive circuit 16. It is connected. Here, a constant voltage (input terminal voltage) is applied to the input terminal of the drive circuit 16, and the output voltage of the error amplifier of the starting circuit 13 (the output terminal voltage of the operational amplifier OP 1) is greater than the input terminal voltage of the drive circuit 16. Is smaller, the first control current Isw corresponding to the potential difference flows and the output voltage of the error amplifier of the control circuit 17 (the output terminal voltage of the operational amplifier OP2) is the input terminal voltage of the drive circuit 16. When it is smaller than that, the diode D2 becomes conductive, and a second control current Ifb corresponding to the potential difference flows. Therefore, the magnitude of the control current Io flowing out from the input terminal of the drive circuit 16 is the sum of the first and second control currents Isw and Ifb.

On the other hand, the drive circuit 16 includes an oscillator, and changes the oscillation frequency of the oscillator according to the control current Io flowing from the input terminal to the start circuit 13 and the output terminal of the control circuit 17, and is driven in proportion to the control current Io. The frequency (operating frequency) finv of the signals V _DH and V _DL is increased or decreased. Therefore, the operating frequency finv of the drive circuit 16 decreases as the output voltage of the error amplifier of the starting circuit 13 and the control circuit 17 increases.

When the power supply from the AC power supply AC to the main circuit unit E is started and the switch SW is switched from on to off, the output voltage Vdc of the main circuit unit E rises, the capacitor C1 is charged by the operating voltage Vd, and the operational amplifier OP1 The output voltage gradually increases, and the first control current Isw gradually decreases accordingly. On the other hand, since the output current (resonant current) of the power conversion circuit 9 is substantially zero at this time, the detection voltage V _Rd is also substantially zero, and the output voltage Vn of the operational amplifier OP1 constituting the error amplifier of the control circuit 17 is the reference voltage. It becomes an initial value (maximum value) according to Vref. As the time elapses, the output current of the power conversion circuit 9 increases and the detection voltage V _Rd also increases, and the output voltage Vn of the operational amplifier OP2 decreases accordingly, but the delay circuit composed of the resistor R10 and the capacitor C11 works. Thus, the output voltage of the error amplifier does not increase from the initial value (substantially zero), and the second control current Ifb of the control circuit 17 is also substantially zero. Therefore, while the output voltage Vn of the operational amplifier OP2 is higher than the input terminal voltage of the drive circuit 16, the second control current Ifb is substantially zero, and the control output Io substantially coincides with the first control output Isw. The feedback control of the operating frequency finv by the control circuit 17 is not performed, and only the control for gradually decreasing the operating frequency finv by the first control current Isw output from the starting circuit 13 is performed as described in the conventional example.

Then, when the operating frequency finv of the drive circuit 16 is gradually decreased by the starting circuit 13 and reaches the starting frequency fm, the output voltage Vx of the power conversion circuit 9 reaches the starting voltage, and the electrodeless discharge lamp 6 is turned on and the characteristics are increased. Changes the output voltage Vx. Further, even after the electrodeless discharge lamp 6 is turned on, the starting circuit 13 reduces the operating frequency finv to the starting end frequency fe. Here, the delay time of the delay circuit in the control circuit 17 is set to the time required until the electrodeless discharge lamp 6 is started and lit. Thereafter, the output voltage Vn of the operational amplifier OP2 and the input terminal voltage of the drive circuit 16 are set. Since the second control current Ifb flows in accordance with the potential difference between them, the operating frequency finv increases as the control current Io increases, and the output voltage Vx of the power conversion circuit 9 decreases. Note that the operating frequency finv of the drive circuit 16 is a frequency (rated rating) when the resonance current matches a desired level when the electrodeless discharge lamp 6 is lit and rated, that is, when the detected voltage V _Rd matches the reference voltage Vref. The lighting frequency is settled to fx. Thereafter, the control circuit 17 feedback-controls the operating frequency finv of the drive circuit 16 so that the resonance current (the output current of the power conversion circuit 9) matches the desired level determined by the reference voltage Vref, and the electrodeless discharge lamp 6 is controlled. Make it light stably. Note that the voltage Vc1 across the capacitor C1 of the starting circuit 13 increases only up to the voltage obtained by dividing the operating voltage Vd by the resistors R1 and R2, so that the divided voltage and the voltage detection circuit when the electrodeless discharge lamp 6 is turned on. 14 is made higher than the input terminal voltage of the drive circuit 16, the drive circuit 16 is controlled only by the control circuit 17 after the starter circuit 13 finishes reducing the operating frequency finv. Therefore, there is an advantage that the control of the control circuit 17 is simplified when the electrodeless discharge lamp 6 is turned on.

  The main circuit portion E and the power conversion circuit 9 are configured by mounting circuit components such as switching elements Q6, Q3, and Q4 on the printed wiring board 50, and are formed in a box shape from a metal material as shown in FIG. The case 60 is housed inside. The printed wiring board 50 has a conductor pattern (not shown) for electrical wiring between circuit components formed on the front surface (or both front and back surfaces). Furthermore, the inside of the case 60 is filled and sealed with the urethane resin 200 to the extent that the leads of the circuit components are hidden.

  Next, the structure which becomes the summary of this embodiment is demonstrated.

  In the present embodiment, at one or more places where a DC voltage is applied to the conductor pattern formed on the printed wiring board 50, deterioration with time is relatively easy to progress, and at the end of life, the life is broken due to deterioration. It is characterized in that the disconnection portion 30 is provided. Further, as shown in FIG. 1, a series circuit of two voltage dividing resistors R11 and R12 is connected between the output terminals of the main circuit portion E, and one voltage dividing resistor R11 and the high potential side of the main circuit portion E are connected. The disconnection part 30 at the time of life is inserted between the output terminal and the detection voltage Vm obtained by dividing the output voltage Vdc of the main circuit part E by the voltage dividing resistors R11 and R12. The control unit 100 performs feedback control (PWM control) for adjusting the on-duty ratio of the drive signal output from the drive circuit 2 so that the detection voltage Vm has a desired value. When the detection voltage Vm becomes zero due to disconnection, the output of the drive signal by the drive circuit 2 is stopped and simultaneously the output of the drive signal by the drive circuit 16 is stopped so that both the main circuit unit E and the power conversion circuit 9 are stopped. Stop the operation.

  When the protective film 61 is formed by, for example, silk-printing an insulating paint on the surface of the printed wiring board 50 on which the conductor pattern 51 is formed as shown in FIG. The slit is formed across the conductor pattern 51 in the width direction and the protective film 61 does not exist. That is, the urethane resin 200 that seals the inside of the case 60 is hydrolyzed by heat generated from the circuit components and moisture contained in the air to generate an acid, and the acid corrodes the conductor pattern 51 and the like of the printed wiring board 50. In the conductor pattern 51, the portions other than the broken portion 30 at the end of the life are covered with the protective film 61 and are not easily corroded by acid, whereas the protective film 61 is not present in the slit portion. For this reason, the electric field is slightly stronger than the surroundings, and the acid is attracted. Therefore, the portion not covered with the protective film 61 is easily corroded by the slit, and as a result, the breakage portion 30 at the time of life progresses relatively quickly. Will be disconnected.

  Therefore, if the lifetime disconnection part 30 is provided in a place where the influence when it deteriorates is less than other parts, the lifetime disconnection part 30 is disconnected before the other part when the device reaches the end of its life. Since the main circuit portion E and the power conversion circuit 9 can be stopped, it is possible to prevent a dangerous part having a large influence when it is deteriorated from being continuously used even after reaching the end of its life. Since the electrodeless discharge lamp 6 does not light when the main circuit portion E and the power conversion circuit 9 are stopped, the user can easily be informed that the device has reached the end of its life. In addition, by determining whether or not the life has been reached based on the disconnection of the conductor pattern 51, that is, the presence or absence of energization, environmental changes and A reliable and clear life determination can be made without being affected by temporary characteristic changes and variations. In addition, the disconnection portion 30 at the time of service life can be formed with a simple structure without any additional parts, and thus has an advantage of being small and inexpensive. Furthermore, since the progress of deterioration of the disconnection part 30 at the time of life can be adjusted according to the width dimension of the conductor pattern 51 and the like, it is possible to design the life independently of the operation of the main circuit part E and the power conversion circuit 9. There is also.

  Here, in the case of an incandescent lamp or a polarized discharge lamp in which a filament is mounted in a glass bulb, the lamp life is usually deteriorated and becomes inconspicuous, so that the lamp life can be easily known. In the case of a non-electrodeless discharge lamp, although the luminous flux gradually decreases at the end of the life, there is no filament, so there is no disadvantage, and there is a high possibility that it will be used beyond the lamp life. When the electrodeless discharge lamp 6 is used beyond the lamp life, not only the light flux becomes insufficient, but the circuit components of the power conversion circuit 9 are damaged due to excessive stress, or the induction coil 5 There is a possibility that it may lead to an inconvenient situation where the coating deteriorates and causes a ground fault. Also, in an electrodeless discharge lamp lighting device, a failure that could not have occurred in the discharge lamp lighting device may occur due to a longer load life than a discharge lamp lighting device that lights a polar discharge lamp. It is assumed that there is a high possibility that a dangerous situation will occur due to a failure. Accordingly, if the electrodeless discharge lamp 6 is made unsatisfactory by stopping the operation of the main circuit portion E and the power conversion circuit 9 by disconnecting the lifetime disconnection portion 30 as in this embodiment, the device reaches the end of its lifetime. The user can be surely informed of this and the safety can be improved.

  Further, in the present embodiment, the life-time disconnection portion 30 is provided at the output end of the main circuit portion E where the DC applied voltage becomes the highest, so that it can be surely disconnected when deterioration progresses, and the AC Even when the rated voltage of the power supply AC is different (for example, 100V to 240V, etc.), a change in life can be suppressed because a constant voltage is applied. However, the location where the disconnection portion 30 is provided may be a location where a high DC voltage is applied. For example, although the time until disconnection is relatively long, the connection of the voltage dividing resistors R11 and R12 The life-time disconnection part 30 may be provided at the point, or the life-time disconnection part 30 may be provided between the output terminal on the high potential side of the main circuit part E and the input terminal of the power conversion circuit 9. .

  As for the structure of the disconnection portion 30 at the time of life, the protective film 61 may be formed only on the peripheral portion of the conductor pattern 51 as shown in FIG. 3B, or the conductor pattern as shown in FIG. The conductive pattern 51 is tilted without being orthogonal to the slit 51, the slit is substantially S-shaped as shown in FIG. 4D, or is formed in a U-shape as shown in FIG. By forming slits so as to straddle, a plurality of (two) lifetime disconnection portions 30 are formed, or, as shown in FIG. One may be formed. In particular, if a plurality of disconnections 30 at the time of life are provided, the conductor pattern 51 can be reliably disconnected at the end of the lifetime.

  By the way, when the protective film 61 is silk-printed on the surface of the printed wiring board 50 as described above, it becomes difficult to read the symbols and the like of the circuit components printed on the surface of the printed wiring board 50. FIG. As shown in (e), the lifetime disconnection 30 may be formed by partially thinning the conductor pattern 51. Also in this case, the conductor pattern 51 can be reliably disconnected at the end of the lifetime by providing a plurality of at-life disconnections 30 as shown in FIG.

  Alternatively, as shown in FIGS. 5A and 5B, a pair of electrodes 52, 52 are formed on the printed wiring board 50 so as to sandwich the conductor pattern 51 in the width direction, and a low voltage is applied between the electrodes 52, 52. Then, by applying an electric field, it is good also as the disconnection part 30 at the time of lifetime of the structure which draws the acid produced by hydrolysis of the urethane resin 200 and advances deterioration (corrosion), and as shown in FIG. A structure may be adopted in which a low voltage is applied between the ground 52 and the electrode 52 opposed to each other with the 51 therebetween. In the case of the disconnection portion 30 at the time of such a structure, the width dimension of the conductor pattern 51 can be freely designed as compared with the structure shown in FIG. 4 and the symbols of the circuit components printed on the surface of the printed wiring board 50 can be used. It won't be difficult to read. Further, the time (life) until disconnection can be adjusted by the distance between the electrodes 52 and 52 and the potential difference.

  Further, in the printed wiring board 50, the portion excluding the land for soldering the circuit component is covered with the solder resist SR including the conductor pattern 51, but the solder resist SR is partially covered as shown in FIG. The lifetime disconnection portion 30 may be provided by forming one or a plurality of portions where the conductor pattern 51 is exposed due to peeling. However, it is necessary to prevent solder from adhering to the exposed portion.

By the way, the time (life) until the disconnection part 30 at the time of life changes depends on the location where the electrodeless discharge lamp lighting device is installed and the temperature and humidity of the use environment. In general, the Arrhenius model is most often used to estimate the lifetime with respect to temperature, and the relationship L∝exp (Ea / kT) holds between the lifetime L of the broken portion 30 at the lifetime and the operating temperature T (however, , K: Boltzmann constant, Ea: activation energy, T: absolute temperature). That is, according to the Arrhenius model, the life L becomes shorter as the temperature T becomes higher, and conversely, the life L becomes longer as the temperature T becomes lower. Further, the Eyring model is most often used to estimate the lifetime with respect to humidity, and a relationship of L∝ (RH) ⁻ⁿ is established between the lifetime L of the disconnection portion 30 at the lifetime and the humidity RH. That is, according to the Eyring model, the life L becomes shorter as the humidity RH becomes higher, and conversely, the life L becomes longer as the humidity RH becomes lower.

Here, as shown in FIG. 2B, a circuit component (for example, an inductor L10 of the main circuit portion E) that generates a relatively large amount of heat on the side opposite to the mounting surface (the lower surface in FIG. 2B) of the printed wiring board 50. ) Position W1 in the vicinity, a position W2 away from circuit components that generate a large amount of heat on the mounting surface (upper surface in FIG. 2B) side of the printed wiring board 50, and a large amount of heat generation on the side opposite to the mounting surface of the printed wiring board 50 Fig. 5 shows the results of estimation of the lifetimes L _W1 , L _W2 , and L _W3 of the lifetime disconnection portion 30 using temperature and humidity as parameters when the lifetime disconnection portion 30 is provided at each position W3 away from the circuit component. 7 (a) and 7 (b), respectively. Note that the position W1 is a place where the temperature is relatively highest, the position W2 is a place where the urethane resin 200 is thin, and is relatively susceptible to humidity, and the position W3 is located at the positions W1 and W2. Compared to temperature and humidity, it is a place that is not easily affected. However, the life-time disconnection portion 30 at the position W3 is more likely to deteriorate by making the width dimension of the conductor pattern 51 thinner than the life-time disconnection portion 30 at the positions W1 and W2. Moreover, the curve X in FIGS. 7A and 7B is a life estimation result due to deterioration having activation energy different from the activation energy corresponding to the breakage of the breakage portion 30 at the time of life.

As shown in FIGS. 7A and 7B, the life is reversed depending on the temperature and humidity. For example, in the case where the disconnection portion 30 at the time of life is provided only at the position W1, in the low temperature range and the low humidity range. There is a possibility that another part deteriorates before the disconnection part 30 at the time of life breaks and the life is reached (refer to the curve X), and an unpredictable problem may occur. Here, since the disconnection part 30 at the time of life (position W3) that is not easily affected by temperature and humidity is easily deteriorated, the life L _{W3 of the} position _W3 is the most under relatively low temperature or low humidity conditions. Estimated to be shorter. On the other hand, the life L _W1 at the position W1 is estimated to be the shortest under the relatively high temperature condition, and the life L _W2 at the position W2 is estimated to be the shortest under the relatively high humidity condition (FIG. 7B). 2), as shown in FIG. 2 (b), life-time disconnection portions 30 are provided at a plurality of locations (positions W1, W2, and W3), and disconnection at the end of life (location W3) is difficult to be affected by temperature and humidity. If the part 30 is easily deteriorated, as shown in FIGS. 7A and 7B, the broken line 30 at the end of its life deteriorates the fastest and breaks in any temperature range and humidity range as shown by thick solid lines A and B. The main circuit unit E and the power conversion circuit 9 can be stopped before a failure that cannot be predicted occurs.

  In addition, in order to make it easy to receive to the influence of humidity, as shown in FIG.2 (c), you may make thin the thickness of the urethane resin 200 in the position W2 in which the disconnection part 30 at the time of life was provided.

(Embodiment 2)
FIG. 8 shows a circuit diagram of the electrodeless discharge lamp lighting device of the present embodiment. However, since the basic configuration of the present embodiment is the same as that of the embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, when the detected voltage Vm proportional to the output voltage Vdc of the main circuit unit E becomes zero due to the disconnection of the lifetime disconnection unit 30, the lifetime detection is performed to stop the power supply from the AC power supply AC to the main circuit unit E. A stop circuit 40 is provided. In the life detection stop circuit 40, the voltage dividing resistors R40 and R41 that divide the output voltage Vdc of the main circuit portion E, and the detection voltage Vn taken out from the connection point of the voltage dividing resistors R40 and R41 are input to the minus terminal. A delay circuit including a comparator CP1 to which the reference voltage Vf is input to the plus terminal, a resistor R13 and a capacitor C11 connected to the output terminal of the comparator CP1, and an anode connected to the output terminal of the delay circuit and a cathode connected to the switching element Q6 And a diode D11 connected to the gate.

  Thus, in the state where the disconnection section 30 at the time of life is not disconnected, the detection voltage Vn always exceeds the reference voltage Vf, so the output of the comparator CP1 becomes low level, and the switching element Q6 of the main circuit section E is controlled by the control section. The switching is controlled by 100, but when the disconnection part 30 at the time of the life is disconnected, the detection voltage Vn becomes zero and falls below the reference voltage Vf, so that the output of the comparator CP1 becomes high level, and the switching element Q6 of the main circuit part E is always turned on. Will turn on. When the switching element Q6 is always turned on and energized for a while, the fuse F inserted between the AC power supply AC and the main circuit portion E is cut off, so that power is supplied from the AC power supply AC to the main circuit portion E. Stops. That is, in the first embodiment, although the control unit 100 stops the operation of the main circuit unit E and the power conversion circuit 9 when the life-time disconnection unit 30 is disconnected, the AC circuit AC is connected to the output terminal of the main circuit unit E. Since the power supply voltage continues to be applied, deterioration of the circuit components may progress due to the application of the power supply voltage even after the life-time disconnection portion 30 is disconnected. However, in this embodiment, the life-time disconnection portion 30 is disconnected. Thus, after the fuse F is blown, no voltage is applied to the circuit components, and the progress of deterioration due to voltage application can be prevented.

  Further, in the present embodiment, a control power supply circuit 110 that steps down the output voltage Vdc of the main circuit section E to create a DC operating power supply is provided, and the control section 100 is operated by the operating power supply created by the control power supply circuit 110. Therefore, as shown in FIG. 8, a life-time disconnection portion 30 may be provided at the input end of the control power supply circuit 110, and the control power supply circuit 110 may be stopped when the life-time disconnection portion 30 is disconnected. That is, if the control power supply circuit 110 is stopped, the operation power is not supplied, and when the control unit 100 stops the operation, the main circuit unit E and the power conversion circuit 9 are also stopped.

(Embodiment 3)
As described in the first embodiment, the period (life) until the life-time disconnection portion 30 reaches the end of the service life and is disconnected tends to be shorter as the temperature is higher, and longer as the temperature is lower. Therefore, the ambient temperature around the circuit component is detected, and if the temperature is relatively high, the life of the disconnection portion 30 at the lifetime is relatively long, and if the temperature is relatively low, the lifetime of the disconnection portion 30 at the lifetime is increased. If adjusted so as to be relatively short, the lifetime break portion 30 deteriorates the fastest in any temperature range even if the lifetime break portion 30 is not provided at each of a plurality of locations having different temperatures as in the first embodiment. Therefore, the main circuit unit E and the power conversion circuit 9 can be stopped before a problem that cannot be predicted occurs.

  Therefore, in the present embodiment, detection means for detecting the ambient temperature, and means for apparently reducing the width dimension of the conductor pattern 51 in the disconnection portion 30 at the time of life when the detection value of the detection means is equal to or lower than a predetermined threshold value. It has. Specifically, as shown in FIG. 9, a positive voltage thermistor PTC as a detecting means and a voltage dividing resistor R20 divided by a constant voltage V0 (detection voltage) Vps is input to the negative terminal of the comparator CP2 and the positive terminal When the ambient temperature (detection voltage Vps) is lower than a predetermined temperature (threshold voltage Vth), the switch element S1 is turned on, and when it is higher, the switch element S1 is turned off. The switch element S1 is connected to the connection point of R21 and R22 in the voltage dividing resistors R21, R22, and R23 via the resistor R24, and the connection point of R22 and R23 in R21 and R22 is connected to the negative terminal of the comparator CP3. Yes. Here, the conductor pattern connecting the voltage dividing resistors R21 and R22 is formed relatively thin. Therefore, when the switch element S1 is on, the voltage applied to the connection point of the voltage dividing resistors R21 and R22 is relatively low, so that the conductor pattern at the connection point is disconnected before the life-time disconnection part 30. However, since the voltage applied to the connection point of the voltage dividing resistors R21 and R22 is relatively high when the switch element S1 is off, the conductor pattern at the connection point is longer than the disconnection part 30 at the time of life. Also disconnect first. If the conductor pattern at the connection point of the voltage dividing resistors R21, R22 is disconnected before the lifetime disconnection part 30, the input of the negative terminal of the comparator CP3 becomes zero, so the output of the comparator CP3 is changed from low level to high level. Switch to level.

  On the other hand, a pair of narrow conductor patterns 51a, 51a, a switch element S2 connected to one conductor pattern 51a, and a resistor R25 connected to the other conductor pattern 51a and equal to the internal resistance value of the switch element S2 If the switch element S2 is turned on, the apparent width of the lifetime break part 30 is increased. If the switch element S2 is turned off, the life break part 30 is formed. The apparent width dimension of becomes narrower.

  Therefore, when the ambient temperature is relatively high, the apparent width dimension of the lifetime disconnection portion 30 is increased to increase the lifetime of the lifetime disconnection portion 30 and when the ambient temperature is relatively low. By shortening the apparent width dimension of the lifetime disconnection portion 30, the lifetime of the lifetime disconnection portion 30 can be relatively shortened. As a result, even if the lifetime disconnection portion 30 is not provided at each of the plurality of locations having different temperatures as in the first embodiment, the lifetime disconnection portion 30 is set to be deteriorated earliest and disconnected at any temperature range. The main circuit unit E and the power conversion circuit 9 can be stopped before an unforeseeable malfunction occurs.

  Alternatively, as shown in FIG. 10, in the life detection stop circuit 40 described in the second embodiment, if a negative characteristic thermistor NTC serving as a means for detecting the ambient temperature is inserted between the voltage dividing resistors R11 and R12, it is negative in the high temperature range. The resistance value of the characteristic thermistor NTC decreases and the applied voltage to the life-time disconnection portion 30 decreases, so that the life of the life-time disconnection portion 30 is relatively increased. In the low temperature range, the resistance value of the negative characteristic thermistor NTC By increasing the applied voltage to the life-time disconnection portion 30 and increasing the lifetime, the life of the life-time disconnection portion 30 can be relatively shortened. With this configuration, it is not necessary to add the switch elements S1, S2, etc., so that it can be realized in a space-saving and low cost.

  Alternatively, as shown in FIG. 11, a life-time disconnection portion 30 obtained by relatively narrowing the width dimension of the conductor pattern 51 and a pair of electrodes 52 and 52 arranged to face each other with the life-time disconnection portion 30 interposed therebetween are provided. If the voltage obtained by dividing the output voltage Vdc of the main circuit portion E with the positive characteristic thermistor PTC and the voltage dividing resistor R30 is applied between the electrodes 52 and 52, the resistance value of the positive characteristic thermistor PTC increases in the high temperature range. Since the electric field applied to the disconnection part 30 at the time of life is weakened, the life of the disconnection part 30 at the time of the life is relatively increased, and the resistance value of the positive temperature coefficient thermistor PTC is increased in the low temperature range. By strengthening, it is possible to relatively shorten the life of the disconnection portion 30 at the time of life. With this configuration, since it is not necessary to change the voltage applied to the life-time disconnection portion 30, the life-time disconnection portion 30 can be provided in any part of the circuit.

  Further, as shown in FIG. 12, a circuit component (heat resistance R31 in the illustrated example) having a large amount of heat is disposed in the vicinity of the disconnection portion 30 at the end of life, and the output voltage Vdc of the main circuit portion E is divided by the voltage dividing resistor R32 and the negative characteristic thermistor If the switch element S3 connected in series to the resistor R31 via the diode D20 is turned on / off with a voltage divided by the NTC, the resistance value of the negative temperature coefficient thermistor NTC increases in the low temperature range, and the diode D20 becomes conductive. The element S3 is turned on, and as a result, the ambient temperature of the lifetime disconnection portion 30 is increased, and the lifetime of the lifetime disconnection portion 30 can be relatively shortened. According to this configuration, there is an advantage that errors can be reduced because life design can be performed considering only the influence of temperature without considering the influence of humidity.

(Embodiment 4)
As described in the first embodiment, the period (life) until the life-time disconnection portion 30 reaches the end of life and is disconnected tends to be shorter as the humidity is higher, and is longer as the humidity is lower. Accordingly, the humidity around the circuit component is detected, and if the humidity is relatively high, the life of the disconnection portion 30 at the lifetime is relatively long, and if the humidity is relatively low, the lifetime of the disconnection portion 30 at the lifetime is relatively If the adjustment is made to shorten the lifetime, the lifetime disconnection portion 30 deteriorates the fastest in any humidity range without providing the lifetime disconnection portions 30 at a plurality of locations having different humidity as in the first embodiment. It is possible to set so as to be disconnected, and the main circuit portion E and the power conversion circuit 9 can be stopped before an unforeseeable malfunction occurs.

  Therefore, in the present embodiment, there are provided detection means for detecting the ambient humidity, and means for apparently reducing the width dimension of the conductor pattern 51 in the life-time disconnection portion 30 when the detection value of the detection means is low. Specifically, as shown in FIG. 13, a voltage (detection voltage) Vpt obtained by dividing the constant voltage V0 by the voltage dividing resistors R40, R41, R42 is input to the negative terminal of the comparator CP4 and input to the positive terminal. A humidity detector 54 comprising a conductor pattern connected to the voltage dividing resistor R40 in parallel with the threshold voltage Vth is connected, and the voltage at the connection point of the voltage dividing resistors R41, R42 is input to the negative terminal of the comparator CP5. The reference voltage Vf is input to the plus terminal. Here, when the humidity is relatively low, the humidity detection unit 54 has a faster degree of deterioration. When the humidity is low, the humidity detection unit 54 does not break before the lifetime disconnection unit 30. Is high, the wire breaks before the lifetime break portion 30. If the humidity detection unit 54 is disconnected before the lifetime disconnection unit 30, the voltage input to the negative terminal of the comparator CP5 is relatively low, and the output of the comparator CP5 is switched from the low level to the high level. .

  On the other hand, the pair of narrow conductor patterns 51a, 51a and the switch element S4 connected to the conductor pattern 51a on one side form a disconnection part 30 at the end of life, and if the switch element S4 is turned on, the service life is reached. If the apparent width dimension of the disconnection part 30 becomes thick and the switch element S4 is turned off, the apparent width dimension of the disconnection part 30 at the time of life becomes thin.

  Accordingly, when the humidity is relatively high, the apparent width dimension of the life-time disconnection portion 30 is increased to increase the life of the life-time disconnection portion 30 and when the humidity is relatively low, By shortening the apparent width dimension of the disconnection part 30, the lifetime of the disconnection part 30 at the time of a lifetime can be shortened relatively. As a result, even if the lifetime disconnection portions 30 are not provided at a plurality of locations where the humidity is different as in the first embodiment, the lifetime disconnection portion 30 is set to be deteriorated most quickly and disconnected in any humidity range. The main circuit unit E and the power conversion circuit 9 can be stopped before an unforeseeable malfunction occurs.

  Alternatively, as shown in FIG. 14, a voltage obtained by dividing the constant voltage V0 by the voltage dividing resistor R43 and the humidity detecting unit 55 whose resistance value has a negative characteristic with respect to humidity is input to the negative terminal of the comparator CP6, and the positive terminal And the switch element S5 connected in parallel to one of the resistors R45 via the resistor R46. In the high humidity region, the resistance value of the humidity detector 55 decreases and the voltage input to the negative terminal of the comparator CP6 becomes relatively low, so the output of the comparator CP6 switches from low level to high level. The switch element S5 is turned on, and the applied voltage of the disconnection unit 30 at the time of service life is lowered, so that the life of the disconnection unit 30 at the time of service life is relatively long. Since the resistance value of the degree detection unit 55 increases and the voltage input to the negative terminal of the comparator CP6 becomes relatively high, the output of the comparator CP6 switches from the high level to the low level, the switch element S5 is turned off, and the lifetime When the applied voltage of the time-breaking portion 30 increases, the life of the life-time breaking portion 30 can be relatively shortened.

  Alternatively, as shown in FIG. 15, a life-time disconnection portion 30 formed by relatively narrowing the width dimension of the conductor pattern 51 and a pair of electrodes 52 and 52 arranged to face each other with the life-time disconnection portion 30 interposed therebetween are provided. If a voltage obtained by dividing the predetermined constant voltage V0 by the humidity detecting unit 55 and the voltage dividing resistor R47 is applied between the electrodes 52, 52, the resistance value of the humidity detecting unit 55 increases in the high humidity region, and the life is broken. Since the electric field applied to the part 30 is weakened, the life of the disconnection part 30 at the lifetime is relatively increased, and the resistance value of the humidity detector 55 is reduced in the low humidity region, and the electric field applied to the disconnection part 30 at the lifetime is increased. Thereby, the lifetime of the disconnection part 30 at the time of lifetime can be shortened relatively.

  By the way, in the electrodeless discharge lamp lighting devices of Embodiments 1 to 4, a lamp socket 62 is connected to a cable 61 led out from the case 60 as shown in FIG. An electrodeless discharge lamp 6 as shown in a) is detachably mounted. The electrodeless discharge lamp 6 includes a glass bulb 6a that has a cylindrical hollow portion 6b inside and is filled with a discharge gas, and is disposed in the hollow portion 6b from the electrodeless discharge lamp lighting device via the cable 61. A high frequency magnetic field is supplied to the induction coil 5 and a high frequency magnetic field is applied to the discharge gas sealed in the glass bulb 6a, thereby causing discharge and lighting.

  FIG. 17 shows a lighting fixture according to the present invention, a fixture main body 200 that has a flat, substantially cylindrical shape, houses an electrodeless discharge lamp lighting device therein, and is provided with a lamp socket 62 on one end surface; A truncated cone-shaped prism 201 attached to the instrument body 200 so as to surround the socket 62, and a substantially bowl-shaped globe 202 attached to the instrument body 200 so as to surround the lamp socket 62 and the prism 201. However, the electrodeless discharge lamp lighting device housed in the appliance main body 200 may be any one of the first to fourth embodiments.

It is a circuit diagram which shows Embodiment 1 of the electrodeless discharge lamp lighting device which concerns on this invention. FIG. 4A is a plan view, FIG. 5B is a cross-sectional view, and FIG. 4C is a cross-sectional view in which a part having a disconnection at the time of lifetime is omitted. (A)-(f) is a top view which shows the specific structural example of a disconnection part at the time of a lifetime, respectively. (A)-(e) is a top view which shows another specific structural example of a disconnection part at the time of a lifetime, respectively. (A)-(c) is a top view which shows another example of another specific structure of a lifetime break part, respectively. (A), (b) is a top view which shows another example of another specific structure of a lifetime break part, respectively. (A), (b) is a graph which shows the relationship between temperature, humidity, and lifetime. It is a circuit diagram which shows Embodiment 2 of the electrodeless discharge lamp lighting device which concerns on this invention. It is a circuit diagram of the principal part in Embodiment 3 of the electrodeless discharge lamp lighting device which concerns on this invention. It is a circuit diagram which shows another structure of the principal part in the same as the above. It is a circuit diagram which shows another structure of the principal part in the same as the above. It is a circuit diagram which shows another structure of the principal part in the same as the above. It is a circuit diagram of the principal part in Embodiment 4 of the electrodeless discharge lamp lighting device which concerns on this invention. It is a circuit diagram which shows another structure of the principal part in the same as the above. It is a circuit diagram which shows another structure of the principal part in the same as the above. The same as the above, (a) is a sectional view of an electrodeless discharge lamp, and (b) is an external perspective view of an electrodeless discharge lamp lighting device. It is a half sectional view showing a lighting fixture according to the present invention.

Explanation of symbols

E Main circuit part 5 Inductive coil 6 Electrodeless discharge lamp 30 Lifetime disconnection part 100 Control part

Claims (13)

A main circuit part that converts a direct current or alternating current input into a desired direct current or alternating current output, and a plurality of circuit parts constituting the main circuit part are mounted, and a conductor pattern serving as an electrical wiring between the circuit parts is provided on the surface. A power supply device comprising a formed printed wiring board, and a case formed in a box shape and containing the printed wiring board inside and filled with urethane resin,
A power source characterized in that at one or a plurality of locations to which a DC voltage is applied in the conductor pattern, there is provided a life-time disconnection portion that is relatively easily deteriorated with time and is disconnected due to the deterioration at the end of the life. apparatus.   Of the conductor pattern, a portion to which a DC voltage is applied is covered with an insulating protective film, and the disconnection portion at the end of life is formed by a slit that crosses the conductor pattern in the width direction and does not have the protective film. The power supply device according to claim 1.   The power supply device according to claim 1, wherein the disconnection portion at the end of life is formed by relatively narrowing a width dimension of the conductor pattern.   The control part which controls operation | movement of the said main circuit part, and stops the operation | movement of a main circuit part when the said disconnection part at the time of a life breaks is provided, The any one of Claims 1-3 characterized by the above-mentioned. Power supply.   5. The lifetime disconnection portion is provided in the vicinity of a circuit component having a relatively large amount of heat generation among circuit components constituting the main circuit portion or the control portion. The power supply device according to item.   The power supply device according to any one of claims 1 to 5, wherein the disconnection portion at the time of service life is provided on a circuit component mounting surface side of the printed wiring board.   Detection means for detecting ambient temperature or humidity, and means for apparently reducing the width dimension of the conductor pattern at the disconnection portion at the time of life when the detection value of the detection means is a predetermined threshold value or less. The power supply device according to claim 3, wherein:   And a detecting means for detecting an ambient temperature or humidity, and a means for increasing the DC voltage applied to the disconnection portion at the end of life when the detection value of the detecting means is a predetermined threshold value or less. The power supply device according to any one of claims 1 to 6.   Detection means for detecting ambient temperature or humidity, a pair of electrodes arranged opposite to each other with the disconnection portion at the end of its life in the width direction, and between the electrodes when the detection value of the detection means is a predetermined threshold value or less The power supply device according to any one of claims 1 to 6, further comprising means for increasing a voltage applied to the power supply.   6. A temperature detecting means for detecting an ambient temperature, and means for increasing the amount of heat generated by the heat-generating component when the detected value of the temperature detecting means is not more than a predetermined threshold value. Power supply.   The power supply device according to any one of claims 1 to 10, wherein a plurality of the disconnection portions at the time of life whose deterioration progresses differ depending on temperature or humidity are provided.   The power supply device according to any one of claims 1 to 11, a high-frequency power supply unit that converts DC power supplied from the power supply device into high-frequency power, and the high-frequency power supply provided in the vicinity of an electrodeless discharge lamp. An electrodeless discharge lamp lighting device comprising: an induction coil connected to an output end of the unit.   An illuminator comprising the electrodeless discharge lamp lighting device according to claim 12 and a lamp socket for holding the electrodeless discharge lamp.

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