JP2009205861A - Discharge lamp lighting device and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device and a luminaire capable of reducing the risk due to service life of solder joints. <P>SOLUTION: A chopper choke CC and a ballast choke BC are respectively equipped with a secondary winding. Voltage detection circuits 51 and 52 are provided and respectively connected to the secondary windings of the chopper choke CC and the ballast choke BC to detect voltages induced by the secondary windings. When either of the voltage detection circuits 51 and 52 detects no voltage, the control circuit 4 performs a prescribed protective operation for protecting circuit components. In each of the chopper choke CC and the ballast choke BC, solder joints of the secondary windings are made more fragile than the solder joints of the primary windings. The risk due to the service life of the solder joints is reduced since the protective operation is performed before the solder joint of the primary winding breaks. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device and a lighting fixture.

  2. Description of the Related Art Conventionally, as a discharge lamp lighting device that supplies an AC power to a discharge lamp to light it, a device that detects the end of its own life and performs a protective operation such as a reduction or stop of output is provided.

As means for detecting the end of life as described above, means for measuring the accumulated lighting time and detecting the end of life when the accumulated lighting time reaches a predetermined life time has been proposed (for example, Patent Documents). 1). Further, it has been proposed to detect the power consumption and the ambient temperature of a component with a limited life, and to correct the cumulative lighting time and the lifetime based on the detected power consumption and the ambient temperature (for example, Patent Document 2).
JP 2001-185374 A JP 2006-236664 A

  By the way, in general, a solder joint for mounting a circuit component on a printed wiring board in an electronic device also has a lifetime. That is, the circuit component and the printed wiring board are repeatedly expanded and contracted by the heat generated by the circuit component, so that stress is applied to the solder joint, and the solder joint is cracked and eventually damaged. Will be disconnected. In particular, in the case of a discharge lamp lighting device, there are many circuit components to which a high voltage is applied, and arc breakage may occur (risk) if the solder joints in such circuit components are damaged as described above.

  However, the conventional end-of-life detection means described above does not detect breakage of the solder joint. Therefore, for example, when used in an environment with a lot of vibration, the solder joint may be damaged before the end of life is detected.

  This invention is made | formed in view of the said reason, The objective is to provide the discharge lamp lighting device and lighting fixture which can reduce the risk by the lifetime of a solder joint part.

  According to the first aspect of the present invention, there is provided a lighting circuit for supplying an AC power to a discharge lamp to light it, a detection control circuit for controlling the lighting circuit, and a print in which at least each circuit component constituting the lighting circuit is mounted by soldering. The lighting circuit includes a transformer in which the voltage across the secondary winding is lower than the voltage across the primary winding, and the secondary winding in which the secondary winding is electrically connected Each secondary-side solder joint that solders the side terminal to the printed wiring board is connected to each primary-side solder joint that solders the primary side terminal to which the primary winding is electrically connected in the transformer. The part protruding on the surface of the printed wiring board is smaller than the part, and the voltage induced in the secondary winding of the transformer is connected to the secondary side terminal and the secondary side solder in the detection control circuit. And is input via the printed wiring board, when the voltage is no longer detected, and performs a predetermined protecting operation for controlling the lighting circuit to protect the circuit components of the lighting circuit.

  According to the present invention, when the secondary side solder joint is damaged, the voltage is not input to the detection control circuit, so that the protection operation is performed. The secondary side solder joint is easier to break than the primary side solder joint because the portion protruding on the surface of the printed wiring board is smaller than the primary side solder joint. The joint is likely to break first. As described above, the protective operation is performed before the primary side solder joint is damaged, and the risk due to the life of the solder joint is reduced.

  According to a second aspect of the present invention, in the first aspect of the invention, each primary side terminal causes an arc discharge between the printed wiring board and the primary side terminal if the primary side solder joint is damaged. It is connected to various parts.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the lighting circuit includes a half-bridge type inverter circuit, and the primary winding as the transformer is for resonance that the inverter circuit of the lighting circuit has. It has what is a ballast choke.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the lighting circuit includes a chopper circuit that converts AC power input from the outside into DC power of a predetermined voltage, and a DC output from the chopper circuit. And an inverter circuit that converts electric power into AC power and supplies it to a discharge lamp, wherein the transformer has a primary winding that is a chopper choke included in a chopper circuit of a lighting circuit.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a portion that protrudes from the surface of the printed wiring board in each secondary-side solder joint is a printed wiring board in each primary-side solder joint. Each land on which the secondary solder joint is formed on the printed wiring board is smaller than each land on which the primary solder joint is formed on the printed wiring board. It is characterized by being made small.

  The invention of claim 6 is the invention according to any one of claims 1 to 5, wherein the transformer is an insertion mounting type, and each secondary side solder joint has a portion protruding on the surface of the printed wiring board. In order to make each primary side solder joint smaller than the portion protruding on the surface of the printed wiring board, each through hole through which the secondary side terminal is inserted in the printed wiring board is a primary side terminal in the printed wiring board, respectively. It is made larger than each through-hole through which is inserted.

  The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the transformer is an insertion mounting type, and each of the secondary side solder joints protrudes from the surface of the printed wiring board. In order to make each secondary-side terminal smaller than a portion protruding on the surface of the printed wiring board at each primary-side solder joint, each secondary-side terminal has a protruding dimension from the printed wiring board larger than each primary-side terminal. It is characterized by that.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the distance between the secondary side terminals is made larger than the distance between the primary side terminals.

  According to the present invention, since the strain generated due to expansion and contraction due to heat is larger in the periphery of the secondary side solder joint than in the periphery of the primary side solder joint, the secondary side solder joint is Since the possibility of breakage before the primary side solder joint becomes higher, the risk due to the life of the solder joint is further reduced.

  The invention of claim 9 is the invention according to any one of claims 1 to 8, wherein the secondary-side solder joint portion in the printed wiring board is more easily damaged than the primary-side solder joint portion. Means for making each land formed on the printed wiring board smaller than each land on which the primary side solder joint is formed, and the transformer is an insertion mounting type and the secondary terminal is inserted in the printed wiring board. Means for making each through-hole larger than each through-hole through which the primary side terminal is inserted in the printed wiring board, and the projecting dimension of each secondary side terminal from the printed wiring board while making the transformer an insertion mounting type Means to make it larger than the protruding dimension of each primary terminal from the printed wiring board, and to make the distance between the secondary terminals larger than the distance between the primary terminals. Of the, characterized in that a plurality of means have been employed.

  The invention of claim 10 is characterized in that, in the invention of any one of claims 1 to 9, the protection operation is to stop the output of AC power from the lighting circuit to the discharge lamp.

  According to an eleventh aspect of the present invention, in any one of the first to tenth aspects, the detection control circuit is guided to the secondary winding of the transformer and is connected to a secondary terminal, a secondary solder joint, a printed wiring board, The protective operation is performed even when the voltage input via the voltage exceeds a predetermined threshold value.

  According to a twelfth aspect of the present invention, there is provided a lighting circuit that supplies alternating current power to a discharge lamp to light it, a detection control circuit that controls the lighting circuit, and a printed wiring in which each circuit component constituting the lighting circuit is mounted by soldering. And a detection component configured to be soldered on the printed circuit board and soldered before the circuit component of the lighting circuit, and the detection control circuit detects the detection voltage in the lighting circuit. When a detection voltage is no longer detected when input through a printed wiring board and a detection component, a predetermined protection operation is performed to control the lighting circuit so as to protect each circuit component of the lighting circuit. And

  According to the present invention, when the solder joint portion of the detection component is damaged, the detection operation is not performed and the protection operation is performed. Since the detection component is easier to break the solder joint than the circuit component of the lighting circuit, the breakage of the solder joint is likely to occur in the detection component before the circuit component of the lighting circuit. As described above, the protection operation is performed before the breakage of the solder joint in the circuit component of the lighting circuit, and the risk due to the life of the solder joint is reduced.

  According to a thirteenth aspect of the present invention, there is provided a lighting circuit for supplying alternating current power to a discharge lamp to light it, a detection control circuit for controlling the lighting circuit, and printed wiring in which each circuit component constituting the lighting circuit is mounted by soldering. The lighting circuit includes an inductor having a detection terminal that is more susceptible to breakage of the solder joint than each of the current-carrying terminals electrically connected at both ends of the winding, and the detection control circuit includes the lighting circuit Each of the circuit components of the lighting circuit when the detection voltage is no longer detected when the detection voltage in the inductor is input via the land to which the detection terminal of the inductor is soldered and the conductive pattern connected to the land. A predetermined protection operation for controlling the lighting circuit is performed so as to protect each of the lighting circuits.

  According to the present invention, when the solder joint is damaged at the detection terminal of the inductor, the connecting portion between the land and the conductive pattern is damaged, and the detection voltage is not input to the detection control circuit, so that the protection operation is performed. Since the detection terminal is more susceptible to breakage of the solder joint than the energization terminal where both ends of the winding are electrically connected in the inductor, the breakage of the solder joint is detected before the inductor energization terminal. Most likely to occur at terminals. As described above, the protection operation is performed before the solder joint is damaged at the current-carrying terminal of the inductor, and the risk due to the life of the solder joint is reduced. Further, in comparison with the invention of claim 12, since the detection component is not required, the manufacturing cost can be reduced.

  According to a fourteenth aspect of the present invention, in the twelfth or thirteenth aspect of the present invention, the detection voltage also serves as a power source for the detection control circuit.

  According to a fifteenth aspect of the present invention, in any one of the twelfth to fourteenth aspects, the detection voltage is input via a discharge lamp.

  According to the present invention, the protection operation is performed even when the discharge lamp is not connected.

  According to a sixteenth aspect of the present invention, in the invention according to any one of the twelfth to fifteenth aspects, the lighting circuit includes a diode bridge that full-wave rectifies the AC power input from the outside, and the detection voltage It is an output voltage.

  The invention of claim 17 includes the discharge lamp lighting device according to any one of claims 1 to 16, and a fixture main body for holding the discharge lamp and the discharge lamp lighting device that are lit by the lighting circuit, respectively. It is characterized by.

  According to the first aspect of the present invention, when the secondary side solder joint is damaged, the voltage is not input to the detection control circuit, so that the protection operation is performed. Further, in claim 1, since the secondary side solder joint is more easily damaged than the primary side solder joint because the portion protruding on the surface of the printed wiring board is made smaller. There is a high possibility that the secondary solder joint will be damaged earlier than the part. As described above, the protective operation is performed before the primary side solder joint is damaged, and the risk due to the life of the solder joint is reduced.

  According to the invention of claim 8, since the distance between the secondary side terminals is made larger than the distance between the primary side terminals, the strain generated due to expansion and contraction due to heat is reduced on the secondary side. Since the circumference of the solder joint becomes larger than the circumference of the primary side solder joint, the possibility that the secondary side solder joint will be broken before the primary side solder joint becomes higher. Lifetime risk is further reduced.

  According to the twelfth aspect of the present invention, when the solder joint portion of the detection component is damaged, the detection operation is not input to the detection control circuit, and the protection operation is performed. Since the detection component is easier to break the solder joint than the circuit component of the lighting circuit, the breakage of the solder joint is likely to occur in the detection component before the circuit component of the lighting circuit. As described above, the protection operation is performed before the breakage of the solder joint in the circuit component of the lighting circuit, and the risk due to the life of the solder joint is reduced.

  According to the thirteenth aspect of the present invention, when the solder joint in the inductor detection terminal is damaged, the connecting portion between the land and the conductive pattern is damaged, and the detection voltage is not input to the detection control circuit, so that the protection operation is performed. . Since the detection terminal is more susceptible to breakage of the solder joint than the energization terminal where both ends of the winding are electrically connected in the inductor, the breakage of the solder joint is detected before the inductor energization terminal. Most likely to occur at terminals. As described above, the protection operation is performed before the solder joint is damaged at the current-carrying terminal of the inductor, and the risk due to the life of the solder joint is reduced. Further, in comparison with the invention of claim 12, since the detection component is not required, the manufacturing cost can be reduced.

  According to the fifteenth aspect of the present invention, since the detection voltage is input via the discharge lamp, the protection operation is performed when the detection voltage is not input to the detection control circuit even when the discharge lamp is not connected. .

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
In the present embodiment, as shown in FIG. 1, a noise removing filter circuit 1 and a chopper circuit that converts AC power input from an external AC power supply AC via the filter circuit 1 into DC power of a predetermined voltage. 2, an inverter circuit 3 for turning on the discharge lamp FL by converting the DC power output from the chopper circuit 2 into high-frequency AC power and supplying it to the hot cathode type discharge lamp FL, and the chopper circuit 2 and the inverter circuit 3 And a control circuit 4 for controlling each of the above. That is, the filter circuit 1, the chopper circuit 2, and the inverter circuit 3 constitute the lighting circuit in the claims.

  More specifically, the filter circuit 1 includes a connector CON1 connected to the AC power supply AC, an across the line capacitor C4, and a line filter LF.

  The chopper circuit 2 includes a diode bridge DB for full-wave rectifying the AC power input from the AC power supply AC via the filter circuit 1 with the DC output terminal on the low voltage side connected to the ground, and the DC output terminal of the diode bridge DB. Is connected to the filter capacitor C3, one end of the chopper choke CC connected to the DC output end of the high voltage side of the diode bridge DB, the diode D1 whose anode is connected to the other end of the chopper choke CC, and one end of the diode. A smoothing capacitor C0 composed of an electrolytic capacitor connected to the cathode of D1 and connected to the ground at the other end; and a switching element Q1 connected at one end to a connection point between the chopper choke CC and the diode D1 and connected at the other end to the ground. And both ends of the smoothing capacitor C0 are output ends. That is, the chopper circuit 2 is a boost type (that is, a boost converter).

  The inverter circuit 3 is a so-called half-bridge type, and includes two connectors CON2 and CON3 connected to one filament of the discharge lamp FL and two switching terminals connected between the output ends of the chopper circuit 2. DC connected to the series circuit of the elements Q2 and Q3, one end connected to the connection point of the two switching elements Q2 and Q3, and the other end connected to one end of one filament of the discharge lamp FL via one connector CON2. A series circuit of a cutting capacitor C1 and a ballast choke BC, one end of which is connected to the other end of the one filament of the discharge lamp FL via the one connector CON2, and the other end is connected to the other connector CON3. And a resonance capacitor C2 connected to one end of the other filament of the discharge lamp FL. The other end of the other filament of the discharge lamp FL is connected to the ground via the other connector CON3.

  The control circuit 4 controls the chopper circuit 2 and the inverter circuit 3 by driving the switching elements Q1 to Q3 on and off, and controls the on / off duty ratio of the switching element Q1 of the chopper circuit 2. As a result, the output voltage of the DC conversion circuit 1 is maintained substantially constant, and the switching elements Q2 and Q3 of the inverter circuit 3 are alternately turned on and off. The control circuit 4 controls the power supplied to the discharge lamp FL by controlling the on / off frequency of the switching elements Q2 and Q3 of the inverter circuit 3. That is, immediately after the power is turned on, the operation is performed in a preheating mode in which power for preheating each filament of the discharge lamp FL is supplied to the discharge lamp FL, and then power for starting, that is, starting discharge is supplied to the discharge lamp. The operation mode is shifted to the start mode for supplying to the FL, and thereafter the steady mode for supplying electric power for steady lighting to the discharge lamp FL. Since such a control circuit can be realized by a well-known technique, detailed illustration and description are omitted.

  Each circuit component constituting the filter circuit 1, the chopper circuit 2, and the inverter circuit 3 is mounted on a rectangular printed wiring board P that is long to the left and right as shown in FIGS. Among the above circuit components, the diode D1 and the switching element Q1 of the chopper circuit 2 are surface-mounted circuit components that are surface-mounted on the solder surface (the lower surface of FIG. 2B) of the printed wiring board P, respectively. Each of the circuit components is an insertion mounting type circuit component that is pin-mounted on the component surface (the lower surface in FIG. 2B) of the printed wiring board P. Each terminal of the circuit component is soldered to a land (not shown) provided on the solder surface of the printed wiring board P.

  Here, the main cause of breakage of the solder joint is distortion caused by thermal expansion of the circuit component and the printed wiring board P due to heat generated by the circuit component. This distortion increases as the heat generation of the circuit component increases. In addition, the larger the size of the circuit component itself, the larger the size. In other words, the circuit components that generate more heat and the circuit components that have larger dimensions are more likely to break the solder joint.

  Of the circuit components, the heat generation is particularly large in the switching elements Q1 to Q3, the chopper choke CC, and the ballast choke BC. Among these, the switching elements Q1 to Q3 are relatively small in size. Among the circuit components, the possibility that the solder joint portion is first damaged is high in the chopper choke CC and the ballast choke BC having large heat generation and relatively large dimensions.

  Therefore, in the present embodiment, the chopper choke CC and the ballast choke BC each have a smaller number of turns than the windings used as inductors (hereinafter referred to as “primary windings”), and the secondary connected with one end to the ground. In addition to providing windings, voltage detection circuits 51 and 52 are connected to the secondary windings for the chopper choke CC and the ballast choke BC to detect voltages induced in the secondary windings. . The control circuit 4 corresponds to the voltage detection circuit 51, 52 in which no voltage is detected from the chopper choke CC and the ballast choke BC when no voltage is detected in any of the voltage detection circuits 51, 52. It is determined that the solder joint is damaged, and a predetermined protection operation for protecting the circuit components is performed. Specifically, as the protection operation, for example, an operation of stopping driving of the switching elements Q2 and Q3 of the inverter circuit 3, an operation of intermittently driving the switching elements Q2 and Q3 of the inverter circuit 3, An operation of reducing the output of the inverter circuit 3 by increasing the frequency at which the elements Q2 and Q3 are turned on and off can be considered. That is, the chopper choke CC and the ballast choke BC each constitute a transformer in the claims, and the control circuit 4 and the voltage detection circuits 51 and 52 constitute a detection control circuit in the claims.

  In the chopper choke CC and the ballast choke BC, the solder joint on the primary winding side (primary solder joint in the claims) is the solder joint on the secondary winding side (secondary solder in the claims). If it breaks before the joint portion), arc discharge may occur between the terminal pins and the conductive pattern of the printed wiring board P on the primary winding side without performing the protective operation. Therefore, in the present embodiment, the solder joint portion on the secondary winding side is easily damaged prior to the solder joint portion on the primary winding side.

  Hereinafter, a means for facilitating breakage of the solder joint on the secondary winding side prior to the solder joint on the primary winding side will be specifically described.

  As already mentioned, solder joints are often damaged by heat distortion, and circuit components with larger dimensions are more likely to break solder joints. Generated strain increases and solder joints are easily damaged. Therefore, in this embodiment, in each of the chopper choke CC and the ballast choke BC, the distance between the terminal pins to which both ends of the primary winding are connected is the distance between the terminal pins to which both ends of the secondary winding are connected. Is bigger than.

  Specifically, in the chopper choke CC having six terminal pins CC1 to CC6 of No. 1 to No. 6 arranged in two rows, primary windings functioning as inductors in the chopper circuit 2 are adjacent to each other in different rows. Are connected between the second and fifth terminal pins CC2 and CC5, and the secondary winding is located diagonally between the first and fourth terminal pins CC1 and CC4 which are the farthest pairs. Connected. In the ballast choke BC having ten terminal pins BC1 to BC10 arranged in two rows, the primary windings functioning as resonance inductors in the inverter circuit 3 are not in different rows. Although it is connected to BC3 and BC9 between the terminal pins of No. 3 and No. 9 which are relatively close to each other, the secondary windings are located at a distance from each other and are the farthest pairs of No. 1 and No. 6 The terminal pins BC1 and BC6 are connected. Here, the secondary windings of the ballast choke BC and the chopper choke CC are connected to the terminal pins BC1, BC6, CC1, CC4 and the printed wiring board P even if the solder joint on the secondary winding side is damaged. The number of turns is such that arc discharge does not occur between the two.

  Further, as shown in FIGS. 3A, 3B to 5A, 5B, terminal pins to which the secondary windings are connected (hereinafter referred to as “secondary terminals”) BC1, BC6. , CC1 and CC4, and other terminal pins BC1 to BC5 and BC7 to BC7, BC9, CC2 and CC5, etc., terminal pins to which the primary windings are connected (hereinafter referred to as “primary terminals”). It is smaller than the solder fillet SF in BC10, CC2, CC3, CC5 and CC6. Here, said solder fillet SF is a portion protruding on the solder surface of the printed wiring board P (the lower side in FIGS. 3 (a) (b) to 5 (a) (b)) at the solder joint. Point to.

  Specifically, in the example of FIGS. 3A and 3B, the solder fillet SF is reduced by making the land to which the secondary terminals BC1, BC6, CC1, and CC4 are soldered smaller than the other lands. Yes. 4 (a) and 4 (b), a plurality of circular shapes each penetrating through the printed wiring board P in the thickness direction and through which the terminal pins BC1 to BC10 and CC1 to CC6 are inserted one by one. Among the through holes PH, the diameters of the through holes PH through which the secondary terminals BC1, BC6, CC1, and CC4 are inserted are the other terminal pins BC1 to BC5, BC7 to BC10, CC2, CC3, CC5, and CC6. The solder fillet SF is made smaller by making it larger than the diameter of each through hole PH to be inserted. 5A and 5B, the secondary terminals BC1, BC6, CC1, and CC4 are shorter than the other terminal pins BC1 to BC5, BC7 to BC10, CC2, CC3, CC5, and CC6 (that is, printed). The solder fillet SF is made smaller by reducing the protruding dimension from the wiring board P). 3A, 3B, 5A, and 5B, only one column of the terminal pins BC1 to BC10 and CC1 to CC6 is illustrated, but the same applies to the other column.

  According to the above configuration, the solder joints of the secondary terminals BC1, BC6, CC1, and CC4 are more easily damaged than other solder joints such as the solder joints of the primary terminals BC3, BC9, CC2, and CC5. In addition, since the protective operation is performed based on the breakage of the solder joints of the secondary terminals BC1, BC6, CC1, and CC4, the solder joints of the primary terminals BC3, BC9, CC2, and CC5 are broken. Risks due to the life of the solder joint, such as the possibility of arcing in the case, are reduced.

  In addition, as a method of making the solder fillet SF of secondary side terminal BC1, BC6, CC1, CC4 smaller than other solder fillets SF, the method of FIG. 3 (a) (b)-FIG. 5 (a) (b) A plurality of them may be used in combination.

  Further, the secondary winding and the voltage detection circuits 51 and 52 need not be provided on both the chopper choke CC and the ballast choke BC, but may be provided only on the ballast choke BC side as shown in FIG. 6, or as shown in FIG. May be provided only on the chopper chalk CC side.

  Furthermore, the control circuit 4 has detected an abnormality not only when the voltage detection circuits 51 and 52 no longer detect the voltage but also when the voltage detected by the voltage detection circuits 51 and 52 becomes excessively high. It may be determined and a protection operation may be performed. For example, when the above configuration is applied to the configuration shown in FIG. 6, as shown in FIG. 8, the voltage detection circuit 51 includes a diode D2 whose anode is connected to the secondary winding of the ballast choke BC and one end of the cathode of the diode D2. And one end connected to the connection point of the two voltage dividing resistors R1 and R2, and the other end connected to the ground. The capacitor C5 and the positive input terminal (non-inverting input terminal) are connected to the connection point of the two voltage dividing resistors R1 and R2, and the first threshold voltage Vth1 is applied to the negative input terminal (inverting input terminal). The input first comparator CP1 and the second comparator in which the negative input terminal is connected to the connection point of the two voltage dividing resistors R1 and R2 and the second threshold voltage Vth2 is input to the positive input terminal CP1 and the first co And it outputs the logical sum of the outputs of the second comparators CP1 of comparator CP1 to the control circuit 4 composed of the OR circuit OR. That is, voltages (hereinafter referred to as “detection voltages”) in which the voltage induced in the ballast choke BC is rectified by the diode D2, divided by the voltage dividing resistors R1 and R2, and smoothed by the capacitor C5 (hereinafter referred to as “detection voltage”) are respectively used. Respectively. The first threshold voltage Vth1 is the upper limit value of the normal range of the detection voltage, and the second threshold voltage Vth2 is the lower limit value of the normal range of the detection voltage. Usually, the outputs of the comparators CP1 and CP2 are both The input to the control circuit 4 from the logic ring circuit OR becomes L level by becoming L level, but when the detection voltage exceeds the first threshold voltage Vth1, and when the detection voltage falls below the second threshold voltage Vth2. Each time, the input from the OR circuit OR to the control circuit 4 becomes H level. Then, the control circuit 4 starts the protective operation when the input from the OR circuit OR becomes H level. In other words, when the output voltage of the inverter circuit 3 becomes abnormally high, the detection voltage exceeds the first threshold voltage Vth1 to perform a protection operation, and when the solder joint is damaged, the detection voltage is set to the second threshold voltage. The protective operation is performed by lowering the voltage Vth2. Since the output voltage of the inverter circuit 3 is higher in the start mode than in the steady mode, the protection operation by the input from the OR circuit OR as described above is performed before the discharge in the discharge lamp FL is stabilized (for example, the start mode ), It may be performed only after discharge in the discharge lamp FL is stabilized (for example, in a steady mode).

(Embodiment 2)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, instead of providing the secondary windings of the chopper choke CC and the ballast choke BC and the voltage detection circuits 51 and 52, as shown in FIG. The output end of the chopper circuit 2 through the detection component 6 designed to be easy and mounted on the printed wiring board P by soldering, and the detection component 6 and the conductive pattern to which the detection component 6 is soldered on the printed wiring board P And a bias detection circuit 53 for detecting the voltage input from the. The control circuit 4 starts the protection operation when the detection component 6 is damaged in the solder joint and the voltage is no longer detected by the bias detection circuit 53. That is, in the present embodiment, the control circuit 4 and the bias detection circuit 53 constitute a detection control circuit in the claims.

  For example, as shown in FIG. 10, the detection component 6 includes two terminal pins 61 electrically connected to each other, and a component main body 62 made of a synthetic resin that holds the terminal pins so as to protrude in the same direction. As shown in FIG. 11, two terminals 63 for surface mounting and an internal element 64 for electrically connecting the terminals 63 to each other and a component made of a synthetic resin may be used. A surface-mounting type including an exterior 65 may be used. For example, the detection component 6 has a larger distance (pitch) between the terminal pins 61 and the terminals 63 and is disposed close to the heat-generating component, so that the detection component 6 is more than any of the circuit components of the filter circuit 1, the chopper circuit 2, and the inverter circuit 3. Also, the possibility of breakage of the solder joint is increased. Although the impedance of the detection component 6 as described above can be made substantially zero, the impedance of the detection component 6 does not necessarily have to be made substantially zero.

  According to the above configuration, the protection operation is performed based on the breakage of the solder joint portion of the detection component 6 designed so that the solder joint portion is generated before the other circuit component. The protection operation is performed before the breakage of the part, and there is a risk due to the life of the soldered part, such as the possibility of arc discharge when the soldered part of the chopper choke CC or the ballast choke BC is broken. Reduced.

  Note that the voltage detected via the detection component 6 is not limited to the output voltage of the chopper circuit 2, and the output voltage of the diode bridge DB is detected via the detection component 6 as shown in FIG. Also good.

  More specifically, in the example of FIG. 12, one end is connected to the positive DC output end of the diode bridge DB, the other end is connected to the other end of the resistor R3 via the detection component 6, and the other end is connected to the ground. A parallel circuit of a connected capacitor C6 and a resistor R4 is provided, and the control circuit 4 is connected to a connection point between the parallel circuit and the detection component 6. That is, the voltage divided by the resistors R 3 and R 4 and the detection component 6 and smoothed by the capacitor C 6 is input to the control circuit 4. The control circuit 4 starts the protection operation when the voltage is no longer input. In this case, even if the solder joint portion of the detection component 6 is not damaged, the protective operation is performed even when the output of the DC power from the diode bridge DB is stopped. That is, the circuit for detecting breakage of the solder joint portion also serves as a power supply detection circuit for detecting a voltage input from the AC power supply AC.

  A configuration as shown in FIG. 13 is also conceivable. 13 includes a resistor R5 having one end connected to the output terminal on the high voltage side of the chopper circuit 2, and the detection component 6 has one end connected to the resistor R5 and the other end connected to the connector CON2 and the resonance capacitor. It is connected to the connection point with C2. Furthermore, a resistor R6 having one end connected to a connection point between the ballast choke BC and the connector CON2, and a Zener diode ZD1, a resistor R7, and a capacitor C7 having one end connected to the other end of the resistor R6 and the other end connected to the ground. And a comparator CP3 in which a positive input terminal is connected to a connection point between the parallel circuit and the resistor R6, a predetermined threshold voltage Vth3 is input to the negative input terminal, and an output terminal is connected to the control circuit 4. With. The detection component 6 and the resistor R6 are connected to each other via the connector CON2 and one filament of the discharge lamp FL. In other words, in a state before the driving of the switching elements Q2 and Q2 of the inverter circuit 3 is started, the output voltage of the chopper circuit 2 is divided by the resistors R5, R6 and R7, the filament of the discharge lamp FL, and the detection component 6. Further, the voltage smoothed by the capacitor C7 is input to the positive input terminal of the comparator CP3. That is, the resistors R6, R7, the capacitor C7, the Zener diode ZD1, and the comparator CP3 together with the control circuit 4 constitute a detection control circuit in the claims, and the conductive patterns of the detection component 6 and the printed wiring board P are released. The voltage input to the resistor R6 through the electric lamp FL is the detection voltage in the claims. The threshold voltage Vth3 is the lower limit of the normal range of the input voltage to the positive input terminal of the comparator CP. After the power is turned on, the control circuit 4 charges the capacitor C7 and the comparator CP3. The inverter circuit 3 is not started until the output of H becomes the H level (that is, the driving of the switching elements Q2 and Q3 is not started). That is, not only when the solder joint is damaged in the detection component 6 but also when the discharge lamp FL is not attached, the operation of not starting the inverter circuit 3 as described above is performed as a protective operation. Therefore, the above circuit serves both as a circuit for detecting breakage of the solder joint and a circuit for detecting no load.

  Further, in each configuration described above, a voltage input via the detection component 6 may be used as a power source for the control circuit 4. That is, a control power supply circuit (not shown) that generates a power supply for the control circuit 4 from a voltage input via the detection component 6 is provided. Since such a control power supply circuit can be realized by a well-known technique, detailed description and illustration are omitted. Even in this case, since the driving of the switching elements Q2 and Q3 of the inverter circuit 3 is stopped when the solder joint portion of the detection component 6 is broken, the output of electric power to the discharge lamp FL as a result. The protection operation of stopping is performed.

(Embodiment 3)
Since the basic configuration of the present embodiment is the same as the example of FIG. 9 of the second embodiment, common portions are denoted by the same reference numerals, and illustration and description thereof are omitted.

  In this embodiment, as shown in FIG. 14, instead of the detection component 6, the chopper is connected via a land to which the first terminal pin BC1 that is most likely to be damaged in the ballast choke BC is soldered. The output terminal of the circuit 2 and the bias detection circuit 53 are connected. That is, the ballast choke BC is the inductor in the claims, and the first terminal pin BC1 is the detection terminal in the claims.

  Further, as shown in FIG. 15, in the conductive pattern (copper foil) PP provided on the printed wiring board P and electrically connecting the output end of the chopper circuit 2 and the bias detection circuit 53, both sides sandwiching the land By making the width of the portion narrower than the width of the other part, the breakage of the solder joint portion constituting the solder fillet SF on the land makes it easy to induce the breakage of the conductive pattern PP.

  That is, when the solder joint is damaged in the first terminal pin BC1 of the ballast choke BC, the above-described conductive pattern PP is also damaged, so that the electrical connection between the chopper circuit 2 and the bias detection circuit 53 is achieved. Since the connection is cut off, the voltage is not detected by the bias detection circuit 53 and the protection operation is performed in the same manner as when the solder joint is damaged in the detection component 6 of the example of FIG.

  According to the above configuration, since the detection component 6 is not required as compared with the example of FIG. 9, the manufacturing cost can be reduced.

  As shown in FIG. 16, the land to which the other terminal pins BC6 and BC10 of the ballast choke BC are soldered is also connected to the chopper circuit 2 and the bias in the same manner as the land to which the first terminal pin BC1 is soldered. It may be interposed between the detection circuit 53. In the example of FIG. 15, the terminal pins located at the end of the ballast choke BC are also selected for the other terminal pins BC6 and BC10. If this configuration is adopted, the electrical connection between the chopper circuit 2 and the bias detection circuit 53 is cut when the solder joint is damaged at any of the terminal pins BC1, BC6, BC10 of the ballast choke BC. Therefore, the safety operation is further improved.

  Further, as shown in FIG. 17, even when an appropriate impedance Z is connected in parallel to the land, the input to the bias detection circuit 53 depends on whether or not the solder joint is damaged in the land. Since they are different from each other, breakage of the solder joint portion is similarly detected. In the example of FIG. 17, the land has two terminal pins BC1 and BC10.

  Moreover, although the example applied to the example of FIG. 9 of Embodiment 2 was shown above, the detection component 6 can be similarly replaced with the land in the example of FIG. 12 of Embodiment 2 and the example of FIG. Furthermore, instead of or in addition to the ballast choke BC, the above-described configuration may be adopted for the chopper choke CC (that is, the chopper choke CC as an inductor in the claims).

  By the way, each circuit component also has a lifetime, and the output voltage VC0 of the chopper circuit 2 is relatively stable as shown in FIG. 18A when the smoothing capacitor C0 is in the initial stage of the lifetime, but the smoothing capacitor C0. Becomes unstable as shown in FIG. 18 (b). Therefore, in each of the above-described first to third embodiments, the control circuit 4 detects the output voltage VC0 of the chopper circuit 2 as shown in FIG. When the low frequency ripple of the output voltage VC0 is detected such that the upper limit exceeds the predetermined upper limit threshold Vth4 and the lower limit of the output voltage VC0 is lower than the predetermined lower limit threshold Vth5, the switching elements Q2 and Q3 of the inverter circuit 3 are driven. The operation may be stopped, or the operation in the start mode may be performed for a predetermined time as shown in FIG.

  Further, the detection of breakage of the solder joint as in each of the above-described embodiments 1 to 3 and other life detection means as described in the section of the prior art are used in combination, and the life is detected by the other life detection means. The protection operation may be performed also when the end stage is detected. Further, the other life detection means is not limited to the one using the cumulative lighting time as described in the section of the prior art, and for example, the number of times the control circuit 4 is turned on or the number of times the discharge lamp FL is replaced. In addition, the end of life may be detected when the number of times reaches a predetermined number of times of life. Since such a control circuit 4 can be realized by a well-known technique, detailed illustration and description thereof are omitted. If other life detection means are used in combination as described above, the safety can be further improved.

  Each of the discharge lamp lighting devices as in the examples of the first to third embodiments can be used for a lighting fixture 7 as shown in FIG. The lighting fixture 7 is electrically connected to one of the fixture main body 71 in which the discharge lamp lighting device is housed and held, and the connectors CON2 and CON3 for the discharge lamp FL held under the fixture main body 71, respectively. And two sockets 72 connected to one base (not shown) of the straight tube type discharge lamp FL.

It is a circuit block diagram which shows Embodiment 1 of this invention. (A) (b) shows the principal part same as the above, respectively (a) is a top view, (b) is a front view. (A) (b) is explanatory drawing which shows the example of the method of providing a difference in the magnitude | size of a solder fillet in each same, (a) shows the example applied to a ballast choke, (b) shows the application to a chopper choke. An application example is shown. (A) (b) is explanatory drawing which shows another example of the method of providing a difference in the magnitude | size of a solder fillet, respectively, (a) shows the example applied to a ballast choke, (b) is a chopper choke. An application example is shown. (A) (b) is explanatory drawing which shows another example of the method of providing a difference in the magnitude | size of a solder fillet in each same, (a) shows the example applied to a ballast choke, (b) is a chopper. An example of application to chalk is shown. It is a circuit block diagram which shows another form same as the above. It is a circuit block diagram which shows another form same as the above. It is a circuit block diagram which shows another form same as the above. It is a circuit block diagram which shows Embodiment 2 of this invention. It is a front view which shows an example of the detection component used for the same as the above. (A) and (b) each show another example of the detection component used in the above, (a) is a front view, and (b) is a bottom view. It is a circuit block diagram which shows another form same as the above. It is a circuit block diagram which shows another form same as the above. It is a circuit block diagram which shows Embodiment 3 of this invention. (A) (b) shows the principal part same as the above, respectively (a) is a front view, (b) is a bottom view. It is a circuit block diagram which shows another form same as the above. It is a circuit block diagram which shows another form same as the above. (A) and (b) each show an example of the output of a chopper circuit, (a) shows the case where a smoothing capacitor is at the end of life, and (b) shows the case where the smoothing capacitor is at the end of life. It is a circuit block diagram which shows another form same as the above. It is explanatory drawing which shows an example of operation | movement of the form of FIG. It is a perspective view which shows an example of a lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter circuit 2 Chopper circuit 3 Inverter circuit 4 Control circuit 6 Detection component 51,52 Voltage detection circuit 53 Ballast detection circuit BC Ballast choke (Transformer and inductor in Claim)
BC1, BC6 terminal pin (secondary terminal and detection terminal in claims)
BC3, BC9 terminal pin (primary side terminal and energizing terminal in claims)
BC10 terminal pin (terminal for detection in claims)
CC Chopper choke (Transformer in Claim)
CC1, CC4 terminal pin (secondary terminal in claims)
CC2 and CC5 terminal pins (primary terminals in the claims)
PH Through hole SF Solder fillet

Claims (17)

A lighting circuit that supplies alternating current power to the discharge lamp to light it;
A detection control circuit for controlling the lighting circuit;
Each circuit component constituting at least the lighting circuit includes a printed wiring board mounted by soldering,
The lighting circuit includes a transformer in which the voltage across the secondary winding is lower than the voltage across the primary winding,
Each secondary-side solder joint for soldering a secondary side terminal to which a secondary winding is electrically connected in the transformer to a printed wiring board is electrically connected to the primary winding in the transformer, respectively. The part protruding on the surface of the printed wiring board is made smaller than each primary side solder joint for soldering the primary side terminal to the printed wiring board,
When the voltage induced in the secondary winding of the transformer is input to the detection control circuit via the secondary terminal, the secondary solder joint, and the printed wiring board, the voltage is no longer detected. A discharge lamp lighting device performing a predetermined protection operation for controlling the lighting circuit so as to protect each circuit component of the lighting circuit.   Each of the primary terminals is connected to a portion where arc discharge occurs between the printed wiring board and the primary terminal if the primary solder joint is damaged. The discharge lamp lighting device according to 1. The lighting circuit includes a half-bridge type inverter circuit,
The discharge lamp lighting device according to claim 1 or 2, wherein the transformer includes a primary winding that is a resonance ballast choke included in an inverter circuit of a lighting circuit. The lighting circuit includes a chopper circuit that converts AC power input from the outside into DC power of a predetermined voltage, and an inverter circuit that converts DC power output from the chopper circuit into AC power and supplies the AC power to the discharge lamp,
The discharge lamp lighting device according to any one of claims 1 to 3, wherein the transformer includes a primary winding that is a chopper choke included in a chopper circuit of a lighting circuit.   In order to make the portion protruding on the surface of the printed wiring board in each secondary side solder joint portion smaller than the portion protruding on the surface of the printed wiring board in each primary side solder joint portion, 5. Each land on which the secondary solder joint is formed is made smaller than each land on the printed wiring board on which the primary solder joint is formed. 6. The discharge lamp lighting device according to 1. The transformer is an insertion mounting type,
In order to make the portion protruding on the surface of the printed wiring board in each secondary side solder joint portion smaller than the portion protruding on the surface of the printed wiring board in each primary side solder joint portion, Each through-hole through which a secondary terminal is inserted is made larger than each through-hole through which a primary terminal is inserted in a printed wiring board, respectively. The discharge lamp lighting device described. The transformer is an insertion mounting type,
In order to make the part protruding on the surface of the printed wiring board in each secondary side solder joint part smaller than the part protruding on the surface of the printed wiring board in each primary side solder joint part, each secondary side terminal The discharge lamp lighting device according to any one of claims 1 to 6, wherein a protruding dimension from the printed wiring board is larger than each primary side terminal.   The discharge lamp lighting device according to any one of claims 1 to 7, wherein a distance between the secondary side terminals is larger than a distance between the primary side terminals. To make the secondary side solder joint easier to break than the primary side solder joint,
Means for making each land where the secondary solder joint is formed in the printed wiring board smaller than each land where the primary solder joint is formed in the printed wiring board;
Means for making each through hole through which the secondary side terminal is inserted in the printed wiring board larger than each through hole through which the primary side terminal is inserted in the printed wiring board, with the transformer being an insertion mounting type,
Means that the transformer is an insertion mounting type, and the protruding dimension of each secondary terminal from the printed wiring board is larger than the protruding dimension of each primary terminal from the printed wiring board;
Among the means for making the distance between the secondary side terminals larger than the distance between the primary side terminals,
The discharge lamp lighting device according to any one of claims 1 to 8, wherein a plurality of means are employed.   The discharge lamp lighting device according to any one of claims 1 to 9, wherein the protection operation is to stop the output of AC power from the lighting circuit to the discharge lamp.   The detection control circuit protects even when the voltage input to the secondary winding of the transformer and input via the secondary terminal, the secondary solder joint, and the printed wiring board exceeds a predetermined threshold. The discharge lamp lighting device according to any one of claims 1 to 10, wherein the operation is performed. A lighting circuit that supplies alternating current power to the discharge lamp to light it;
A detection control circuit for controlling the lighting circuit;
A printed wiring board on which each circuit component constituting the lighting circuit is mounted by soldering, and
A detection component that is mounted on a printed wiring board by soldering and configured to break the solder joint before the circuit component of the lighting circuit;
The detection control circuit inputs the detection voltage in the lighting circuit via the printed wiring board and the detection component, and when the detection voltage is no longer detected, the lighting control circuit protects each circuit component of the lighting circuit. A discharge lamp lighting device characterized by performing a predetermined protective operation for controlling the lamp. A lighting circuit that supplies alternating current power to the discharge lamp to light it;
A detection control circuit for controlling the lighting circuit;
Each circuit component constituting the lighting circuit includes a printed wiring board mounted by soldering,
The lighting circuit includes an inductor having a detection terminal that is more susceptible to breakage of the solder joint than each energizing terminal in which both ends of the winding are electrically connected,
The detection control circuit inputs a detection voltage in the lighting circuit via a land to which the detection terminal of the inductor is soldered and a conductive pattern connected to the land, and the detection voltage is no longer detected. A discharge lamp lighting device performing a predetermined protection operation for controlling the lighting circuit so as to protect each circuit component of the lighting circuit.   The discharge lamp lighting device according to claim 12 or 13, wherein the detection voltage also serves as a power source of the detection control circuit.   The discharge lamp lighting device according to any one of claims 12 to 14, wherein the detection voltage is input via a discharge lamp. The lighting circuit includes a diode bridge that full-wave rectifies AC power input from the outside,
The discharge lamp lighting device according to any one of claims 12 to 15, wherein the detection voltage is an output voltage of the diode bridge.   An illumination fixture comprising: the discharge lamp lighting device according to any one of claims 1 to 16; and a fixture main body that holds the discharge lamp and the discharge lamp lighting device that are lit by a lighting circuit.

Images