JP5946712B2 - Illumination power supply device and illumination power supply replacement method - Google Patents

Description

  The present invention relates to an illumination power supply device that lights a plurality of LED lights with a current from a constant current supply means (constant current power supply), and an illumination power supply replacement method for changing the power supply in the illumination power supply device.

  When manufacturing a semiconductor device, die bonding for mounting a semiconductor chip (die) on a lead frame as a mounted member is performed. For this die bonding, a die bonder having a collet for adsorbing chips is used.

  As shown in FIG. 11, such a die bonder includes a bonding arm (not shown) having a collet 3 for attracting the semiconductor chip 1 of the supply unit 2 and a confirmation camera (not shown) for observing the semiconductor chip 1 of the supply unit 2. And a confirmation camera (not shown) for observing the island portion 5 of the lead frame 4 at the bonding position.

  The supply unit 2 includes a semiconductor wafer, and the semiconductor wafer is divided into a large number of semiconductor chips 1. Further, the bonding arm holding the collet 3 can be moved between the pickup position and the bonding position via the conveying means.

  Further, the collet 3 is vacuum-sucked through the suction holes opened in the lower end surface thereof, and the chip 1 is adsorbed on the lower end surface of the collet 3. If this vacuum suction (evacuation) is released, the chip 1 is detached from the collet 3.

  Next, a die bonding method using this die bonder will be described. First, the chip 1 to be picked up is observed with a confirmation camera disposed above the supply unit 2, and the collet 3 is positioned above the chip 1 to be picked up, and then the collet 3 as indicated by an arrow A. Is lowered to pick up the chip 1. Thereafter, the collet 3 is raised as shown by the arrow B.

  Next, the island portion 5 of the lead frame 4 to be bonded is observed with a confirmation camera arranged above the bonding position, and the collet 3 is moved in the direction of arrow C, and above the island portion 5. After being positioned, the collet 3 is moved downward as indicated by an arrow D, and the chip 1 is supplied to the island portion 5. In addition, after the chip is supplied to the island portion 5, the collet 3 is raised as indicated by the arrow E and then returned to the standby position above the pip-up position as indicated by the arrow F.

  That is, by moving the collet 3 sequentially as indicated by arrows A, B, C, D, E, and F, the chip 1 positioned based on the observation of the pickup confirmation camera is picked up by the collet 3. The chip 1 is mounted on the island portion 5.

  In such a die bonder, an illumination system is used for image recognition (Patent Document 1). Further, in recent years, LED lighting having excellent characteristics when it consumes less power, has a longer life, and generates less heat than a normal light bulb or fluorescent lamp is used for the lighting system. LED lighting is a lighting fixture using a light emitting diode (LED).

  When the LED illumination is turned on, a constant voltage power source 10 having a relatively simple configuration as shown in FIG. 12 has been conventionally used as a power source. That is, the constant voltage power source 10 is connected to a controller (not shown) and the illumination 1, the illumination 2, and the illumination 3 that are respectively driven by a constant voltage V (for example, 12V) to constitute an illumination system. The constant voltage power supply is a power supply that employs a lighting method that ensures a predetermined forward current by making the voltage V applied to the illumination constant.

  However, in recent years, heat loss can be suppressed, lighting efficiency can be increased, and fluctuations in forward voltage of LED lighting and influences due to temperature changes can be reduced. Therefore, as shown in FIG. Use of the constant current power supply 11 may be desired. The constant current power source is a power source that employs a constant current lighting method that makes the forward current of LED lighting constant.

  When the lighting system shown in FIG. 13 is configured from the lighting system shown in FIG. 12 configured by the constant voltage power supply 10, the controller, and the illuminations 1 to 3, the constant voltage power supply 10 is replaced with the constant current power supply 11. In this case, in order to illuminate the illuminations 1 to 3 with the same brightness as the illumination system shown in FIG. 12, the controller searches for current values I1 to I3 at which the constant voltage V is obtained in advance, and each illumination 1 to 1 is obtained. 3, it is necessary to set so that the currents I1 to I3 obtained by the search are applied.

  Conventionally, there is an LED abnormality detection circuit that detects an abnormality of an LED (Patent Document 2). In this case, it is for detecting a failure such as an open or short of the LED.

JP 2001-313303 A JP 2010-287611 A

  When the constant voltage power supply 10 is replaced with the constant current power supply 11, in order to turn on the lights 1 to 3 with the same brightness even after the replacement, the current value at which the controller obtains the voltage V in advance as described above. A step of searching for I1 to I3 and setting the currents I1 to I3 to be applied to the respective lights 1 to 3 is necessary. At this time, if the setting of the current values I1 to I3 is incorrect or the connection of the lighting is wrong in each of the lightings 1 to 3, an appropriate current does not flow to the lighting. If an excessive current flows in the illumination, the illumination may break down in some cases. If the current flowing in the illumination is insufficient, the illumination effect may not be sufficiently obtained.

  In Patent Document 2, it is for detecting a failure such as an open or short of an LED, detects a failure of the LED itself, and determines whether the connected LED illumination is wrong. It cannot be done.

  In view of the above problems, the present invention provides a lighting power supply device that can replace a constant voltage power source connected to a controller and lighting with a simple operation and can accurately apply a lighting current after the replacement. And a power supply replacement method for lighting.

The illumination power supply device of the present invention is connected to an illumination that lights at a preset voltage and a controller that is a drive source, and a constant voltage power source that applies a constant voltage to the illumination and a constant current that applies a constant current to the illumination. A lighting power supply apparatus that replaces a current power source and lights an illumination with a constant applied current, before the lighting is turned on at the predetermined voltage in a state where the constant voltage power source is replaced with a constant current power source. In addition, a search means for searching for a current value necessary for applying the search current to the illumination and applying the predetermined voltage, and a lighting current having a current value searched for by the search means for the illumination. Current supply means.

  According to the lighting power supply device of the present invention, when connected to the controller and the lighting, the search means automatically searches for a current value necessary for applying the predetermined voltage before the lighting is turned on at the predetermined voltage. In other words, the controller can search for the current value necessary to apply a predetermined voltage in advance, and can omit the step of setting the lighting current of the current value obtained by the search for each illumination. As a work, it is only necessary to connect the lighting power supply device of the present invention to the lighting and the existing controller. This eliminates the need for the operator to search for a current value necessary for applying a predetermined voltage in advance and to apply a lighting current having a current value obtained by the search to each illumination. In addition, since the lighting power supply device of the present invention is connected to the controller and the lighting, the current value is searched, and then the lighting current is applied, so even if there is a lighting misconnection, it is applied to the lighting. The lighting current to be applied can be accurately applied.

  In the above configuration, the exploration means may apply the exploration current until a predetermined voltage is applied to the illumination while sequentially increasing the exploration current from a minute current value.

  The said structure WHEREIN: The said constant current supply means shall apply the search current applied to illumination before lighting the said illumination with the predetermined voltage, and the lighting current for lighting illumination with the said predetermined voltage. That is, the constant current supply means serves as both means for applying the exploration current and means for applying the lighting current.

  In the configuration described above, a setting unit that sets the maximum current value of the illumination, and a determination unit that determines whether the actually connected illumination corresponds to the illumination based on a preset illumination determination value A predetermined voltage exploration mode for exploring a current value necessary for applying the predetermined voltage to the illumination by the exploration means, and applying a lighting current of the explored current value to the illumination, and the setting Switching means for enabling mode selection with an illumination judgment mode for judging whether or not the illumination actually connected corresponds to the illumination based on a preset illumination judgment value by means and judgment means Can be provided. Thereby, it can also be judged by the judgment means whether the actually connected illumination corresponds to the model.

  The illumination is an LED illumination consisting of only an LED and a limiting resistor or LED, and includes a calculation means for obtaining a resistance value of the limiting resistor based on a current value flowing through the LED illumination and a voltage value at the current value. When this resistance value is r, if r≈0, LED lighting without a limiting resistance may be used.

  The illumination power supply apparatus can be used for illumination for image recognition. Since many illuminations for image processing are premised on being driven at a constant voltage, the illumination power supply device of the present invention can be applied to many illuminations for image recognition.

  The illumination power supply replacement method of the present invention is connected to an illumination that lights at a preset voltage and a controller that is a driving source, and a constant voltage power source that applies a constant voltage to the illumination is applied, and a constant current is applied to the illumination. A power supply replacement method for replacing with a constant current power supply, after releasing the connection between the constant voltage power supply and the illumination and the controller, connecting the illumination power supply device of the present invention, the illumination and the controller, Before turning on the illumination at the predetermined voltage, the exploration means of the power supply device applies an exploration current to the illumination to explore the current value necessary to apply the predetermined voltage, and the constant current supply means of the power supply device The lighting current of the current value searched by the searching means is applied to the illumination.

  According to the lighting power supply replacement method of the present invention, when any of the lighting power supply devices of the present invention is connected to a controller and lighting, it is necessary to apply a predetermined voltage before applying the lighting at a predetermined voltage. In order to automatically search for the current value, the operator searches for the current value necessary to apply a predetermined voltage in advance and sets the lighting current of the current value obtained by the search to be applied to each illumination. There is no need to do it. Further, even if there is an incorrect connection of illumination, the lighting current to be applied to the illumination can be applied accurately.

  In the illumination power supply device and illumination power supply replacement method according to the present invention, in the installation work (replacement work) from the constant voltage power supply to the constant current power supply, it is only necessary to connect to the illumination and the existing controller. Thus, the setting work of the current value is not required, so that installation work (replacement work) can be saved, and the constant voltage power supply can be easily replaced with the constant current power supply. In addition, since the current value is searched after connecting to the controller and the lighting, even if there is a lighting misconnection, the current value to be applied to the lighting can be searched and the lighting current can be accurately applied, It can be prevented that an excessive current flows and the lighting breaks down, or a current flowing through the lighting is insufficient and the lighting effect becomes insufficient.

  If the search current is sequentially increased from a minute current value until a predetermined voltage is applied, the current value can be searched with high accuracy, and the current with an excessive current value is not applied suddenly to the illumination. It is possible to effectively prevent damage to lighting.

  If the constant current supply means serves as both the means for applying the exploration current and the means for applying the lighting current, the apparatus configuration can be simplified, so that the apparatus can be reduced in size and saved in space.

  The illumination is an LED illumination composed of an LED and a limiting resistor, and when the resistance value of the limiting resistor is r, it is determined whether or not r≈0 by the determining means based on the calculated value calculated by the calculating means. In this case, it is possible to prevent the current from flowing excessively to a device that does not have a limiting resistance, and to effectively avoid damage to the LED lighting that has been connected incorrectly.

  A predetermined voltage exploration mode in which a current value necessary for applying the predetermined voltage to the lighting is searched and a lighting current having the searched current value is applied to the lighting, and the actually connected lighting are set in advance. If it is possible to select the illumination judgment mode for judging whether the illumination is appropriate based on the judgment value of the illumination, it is used even when the power supply device is not replaced as described above. Can be expanded.

  If the illumination power supply device of the present invention is used for illumination for image recognition, it is possible to illuminate an object to be recognized with an optimum illuminance for image recognition, and high-accuracy image recognition is possible.

1 is a simplified overall block diagram of an illumination power supply device showing a first embodiment of the present invention. It is a perspective view of a die bonder. It is a flowchart figure which shows the usage method of the power supply device for illumination shown in the said FIG. It is a simplified whole block diagram of the power supply device for illumination which shows 2nd Embodiment of this invention. It is a flowchart figure which shows the usage method of the power supply device for illumination shown in the said FIG. It is a circuit diagram of LED illumination. It is a graph which shows the electric current and voltage characteristic of LED of LED illumination. It is a graph which shows the electric current and voltage characteristic of the limiting resistance of LED illumination. It is a graph which shows the synthetic | combination voltage of LED and resistance of LED illumination. It is a flowchart figure at the time of using the limiting resistance of LED illumination for a judgment element. It is a simplified diagram showing a die bonding process. It is a simplified block diagram of the illumination system using the conventional constant voltage power supply. It is a simplified block diagram of the illumination system using the conventional constant current power supply.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 shows a simplified overall block diagram of an illumination system using the illumination power supply device according to the first embodiment of the present invention. This illumination system is, for example, an image confirmation of a die bonder that is an illuminated device shown in FIG. Used for. The die bonder performs die bonding for mounting the semiconductor chip (die) 21 on the lead frame 24.

  Such a die bonder includes a bonding arm 30 having a collet 23 that adsorbs the semiconductor chip (die) 21 of the supply unit 22, a confirmation camera 26 for observing the semiconductor chip 21 of the supply unit 22, and a lead frame 24 at the bonding position. And a confirmation camera 32 for observing the island portion 25.

  The supply unit 22 includes a semiconductor wafer 28 mounted and supported on a wafer support device 27. The semiconductor wafer 28 is divided into a large number of semiconductor chips 21. The collet 23 is connected to a collet holder 29, and the collet 23, the collet holder 29, and the like constitute a bonding arm 30. The bonding arm 30 can be moved between the pickup position and the bonding position via the conveying means 31. The transport unit 31 can drive the bonding arm 30 in the X, Y, θ, and Z directions.

  Further, the chip 21 is vacuum-sucked through the suction holes opened in the lower end surface of the collet 23, and the chip 21 is adsorbed on the lower end surface of the collet 23. If this vacuum suction (evacuation) is released, the chip 21 is detached from the collet 23.

  Next, a die bonding method using this die bonder will be described. First, the chip 21 to be picked up is observed with the confirmation camera 26 arranged above the supply unit 22, the collet 23 is positioned above the chip 21 to be picked up, and then the collet 23 is lowered. The lever chip 21 is picked up.

  Further, the island portion 25 of the lead frame 24 to be bonded is observed with the confirmation camera 32 disposed above the bonding position, and the collet 23 is moved onto the island portion 25 as indicated by an arrow A1. Thereafter, the collet 23 is lowered and the chip 21 is supplied to the island portion 25.

  When observing with the confirmation camera 26 at the pickup position and when observing with the confirmation camera 32 at the bonding position, an illumination system for illuminating the observation site is required. For this purpose, an illumination system including a controller 41 (hereinafter referred to as a host controller 41) as shown in FIG. 1, an illumination power supply device 42 (hereinafter referred to as a power supply device) of the present invention, and an illumination 43 is used.

  As shown in FIG. 1, the power supply device 42 is connected to a host controller 41 and a plurality of lights 43. In the present embodiment, the illumination 43 is an LED illumination that is driven at a predetermined voltage (for example, 12 V), and the illumination 43 is hereinafter referred to as an LED illumination 43. The host controller 41 is configured by a personal computer, for example.

  The power supply device 42 includes a CPU (central processing unit) 45, a plurality of constant current drive circuits 46, a plurality of voltage measurement circuits 47, and a plurality of ADCs (analog-digital conversion circuits) 48. In this case, a constant current supply circuit (constant current supply means) 50 is formed to apply a current to one LED illumination 43. That is, each constant current supply circuit 50 includes a CPU 45, a constant current drive circuit 46, a voltage measurement circuit 47, an ADC 48, and the like. The constant current supply circuit 50 applies a predetermined current value to the LED illumination 43 by the constant current drive circuit 46 according to an instruction from the CPU 45. Note that the host controller 41 and the CPU 45 are connected via a communication port 51.

By the way, the CPU 45 is provided with exploration means 52 for exploring a current value necessary to apply 12 V to the LED illumination 43 before applying the LED illumination 43 at a predetermined voltage (12 V). ing. That is, when the exploration means 52 instructs to apply the exploration current having a minute current value (for example, 10 mA), the constant current drive circuit 46 of the constant current supply circuit 50 applies a current value of 10 mA to the LED illumination 43. The voltage measuring means 47 measures the output voltage at this time and transmits it to the exploration means 52. The exploration means 52 increases the current value sequentially until 12V is applied to the LED illumination 43 until 12V is applied to the LED illumination 43 (that is, until the voltage measurement value by the voltage measurement means 47 reaches 12V). Apply exploration current. And when 12V is applied to the LED illumination 43, the exploration means 52 uses the current value at that time as a lighting current necessary for lighting the LED illumination 43, and applies the lighting current to light the LED illumination 43.
Thereby, LED43 illumination continues lighting at 12V.

  Next, an LED illumination 43 that is lit at a preset voltage (12 V in this embodiment), a constant voltage power source that applies a constant voltage to the LED illumination 43, and a host controller 41 that is a drive source are connected. A power supply replacement method in which a constant voltage power supply (not shown) is replaced with a power supply device 42 of the present invention which is a constant current power supply (a power supply for lighting an illumination with a constant current applied), And the usage method of the illumination system after replacement is demonstrated based on the flowchart figure etc. which are shown in FIG. First, after releasing the connection between the constant voltage power supply and the LED illumination 43 and the host controller 41 (step S1), the power supply device 42 of the present invention is connected to the LED illumination 43 and the host controller 41 (step S2). Configure the lighting system. At this time, the host controller 41 does not need to search for a current value at which a predetermined voltage (12 V) is obtained.

  When the main power supply of the lighting system is turned on and the exploration means 52 instructs the LED illumination 43 to apply a exploration current having a minute current value (for example, 10 mA) (step S3), the constant current of the constant current supply circuit 50 The drive circuit 46 applies an exploration current having a current value of 10 mA to the LED illumination 43 to light the LED illumination 43. The voltage measuring means 47 measures the output voltage at this time (step S4) and transmits it to the exploration means 52.

  At this time, the exploration means 52 determines whether or not the output voltage is smaller than 12V (step S5). If it is smaller than 12V, the exploration means 52 increases the current value until 12V is applied to the LED illumination 43 (that is, until the voltage measurement value by the voltage measurement means 47 reaches 12V) (step S6), and the LED Steps S4 to S6 are repeated until 12V is applied to the illumination 43 to apply the exploration current.

  When the applied voltage of the LED illumination 43 reaches 12V (step S5), the exploration means 52 sets the current value at that time as a lighting current necessary for lighting the LED illumination 43 (step S7), and thereafter applies the lighting current. Then, the LED illumination is turned on at 12V (step S8). At this time, the lighting current is applied by the constant current supply means 50. That is, the constant current supply means 50 can apply both the exploration current and the lighting current. When the present lighting system is terminated (step S9), the main power is turned off.

  In the power supply device according to the first embodiment of the present invention, in the installation work (replacement work) from the constant voltage power supply to the constant current power supply, it is only necessary to connect to the LED lighting 43 and the existing host controller 41, Since the operator does not need to set the current value, it is possible to save installation work (replacement work) and easily replace the constant voltage power supply with the constant current power supply. Further, since the current value is searched after the power supply device 42 of the present invention is connected to the host controller 41 and the LED illumination 43, even if the LED illumination 43 is erroneously connected, the current value to be applied to the LED illumination 43 Thus, the lighting current can be accurately applied, and it is possible to prevent the LED illumination 43 from failing due to excessive current flow or the current flowing through the LED illumination 43 from being insufficient, resulting in insufficient illumination effect. .

  FIG. 4 shows an illumination system using an illumination power supply device 56 (hereinafter referred to as a power supply device) according to a second embodiment of the present invention. The power supply device 56 of the second embodiment searches for a current value necessary for applying the predetermined voltage 12V to the LED illumination 43 by the search means 52 of the power supply device of the first embodiment, and searches for the current value. Is provided with a predetermined voltage search mode in which the lighting current is applied to the LED illumination 43. Further, the setting means 54 and the determination means 55 which will be described later determine whether the LED illumination 43 actually connected corresponds to the LED illumination 43 based on a preset judgment value of the LED illumination 43. A lighting judgment mode for judging is provided. And the switching means 57 (changeover switch) which can select these modes is provided.

That is, the CPU 45 is further provided with setting means 54 and determination means 55 in addition to the exploration means 52. The setting means 54 sets a maximum current value of the LED illumination 43 and sets a table including data such as the maximum current value of the LED illumination 43. The table data is, for example, as shown in Table 1 below. In this case, the LED illumination 43 has three types of 1ch, 2ch, and 3ch. Then, a determination current value, a determination minimum voltage value, and a determination maximum voltage value are set for each LED illumination 43. Each LED illumination 43 has a maximum current value.

  The determination unit 55 determines whether the LED illumination 43 that is actually connected corresponds to the LED illumination 43 based on a preset determination value of the LED illumination 43.

  In the constant current supply circuit 50, the constant current drive circuit 46 applies a current having a predetermined current value to the LED illumination 43 in accordance with an instruction from the CPU 45. The voltage measurement circuit 47 detects (measures) the voltage resulting from the application of the current, and inputs the measured voltage to the CPU 45 via the ADC 48. The CPU 45 compares the input table data and sequentially increases the applied current value until the current value reaches a predetermined value. Moreover, the determination means 55 of this CPU45 determines whether the LED illumination 43 is connected to the apparatus (die bonder etc.) corresponding to it so that it may mention later.

  Also, a warning generation means 44 is provided for generating a warning when the determination means 55 determines that the LED illumination 43 is not connected to a corresponding device (such as a die bonder). is there. As a warning, a warning sound may be generated or a warning lamp may be turned on. Further, the alarm sound may be generated and the warning lamp may be turned on.

  Whether to select the predetermined voltage search mode or the illumination determination mode is selected according to the application of the power supply device 56 and the LED illumination 43 connected thereto. That is, as described in the first embodiment, when replacing the constant power supply device connected to the LED lighting 43 that lights at a predetermined voltage, the predetermined voltage exploration mode is selected. Select the judgment mode. Since the method of using the illumination system when the predetermined voltage search mode is selected is the same as that in steps S3 to S3 in FIG. 3 of the first embodiment, the use of the illumination system when the illumination determination mode is selected is described below. The method will be described based on the flowchart shown in FIG.

  First, the LED illumination 43 is connected to a plurality of different devices (in this case, die bonders). Then, the main power supply of the lighting system is turned on. When the power is turned on in this way, the power supply device 56 side, that is, the CPU 45 receives the setting number representing the die bonder model from the host controller 41. The maximum current value is set for each channel in accordance with the combination of the LED illuminations 43 employed in the model. That is, as shown in FIG. 5, the present illumination system is set (step S11).

  Next, a current having a minute current value is applied to the LED illumination 43 (step S12). Thereafter, the current value is sequentially increased until the determination current value is reached (step S13). The determination maximum voltage value may be reached before the determination current value is reached. Therefore, it is determined whether or not the maximum determination voltage value is exceeded (step S14). The increase in the current value may be increased continuously or stepwise.

  When the determination maximum voltage value is exceeded in step S14 (when the determination maximum voltage value is exceeded before reaching the determination current value), it is determined that the determination is rejected (step S15). That is, No, 1 to No, 3 channels are attached to each device, and each channel has a determination current value, a determination minimum voltage value, a determination maximum voltage value, and a maximum current value as shown in Table 1 above. Is set. For this reason, for example, the LED illumination 43 of the channel 1 is determined to be rejected when the current value exceeds 10.0 V before the current value reaches 1500 mA. The LED illumination 43 of channel 2 is determined to be unacceptable when the current value exceeds 12.5 V before reaching 400 mA. The LED illumination 43 of the channel 3 is determined to be unacceptable when the current value exceeds 4.0 V before the current value reaches 350 mA.

  If it is determined to be unacceptable in step S15, a warning is issued (step S16). If the warning is generated in this way, the operator can recognize that the LED illumination set in the device (die bonder) where the warning is generated does not correspond to the die bonder. Accordingly, it is possible to prevent the die bonding work from being performed with the LED illumination 43 that does not correspond to the set.

  If the maximum determination voltage value is not exceeded in step S14, it is determined whether the determination current value has been reached (step S17). If the determination current value is not reached in step S14, the process returns to step S13. That is, the current value is increased until the determination current value is reached. And if it becomes a determination electric current value, it will be determined whether the voltage value at that time is a determination voltage value (step S18). That is, it is determined whether it is within the range between the minimum determination voltage value and the maximum determination voltage value in Table 1, and if it is within this range, it is determined to be acceptable. If it is not in this range, it will transfer to step S15 and will determine with disqualification.

  In the case of this embodiment, in channel 1, if the determination current value is 1500 mA and the voltage value is in the range of 8.0 V to 10.0 V, the channel is passed. In channel 2, if the determination current value is 400 mA and the voltage value is in the range of 10.0 V to 12.5 V, the test is passed. In channel 2, if the determination current value is 350 mA and the voltage value is in the range of 2.5 V to 4.0 V, the test is passed.

  Thus, if it determines with a pass (step S19), each LED illumination set to the to-be-illuminated apparatus (die bonder) will respond | correspond to this die bonder. For this reason, a die bonding process can be performed with this die bonder with this LED illumination set.

  As described above, the power supply device according to the second embodiment also has the same effects as the power supply device according to the first embodiment. In particular, in the power supply device of the second embodiment, it is possible to select the predetermined voltage exploration mode and the illumination determination mode, so that the replacement of the power supply device as described in the first embodiment is not performed. Even if it exists, it can be used and an application range can be expanded.

  Incidentally, the LED illumination 43 generally includes an LED 60 and a limiting resistor 61 connected in series to the LED 60, as shown in FIG. On the other hand, there is an LED illumination 43 that does not have such a limiting resistor 61. When the current value is increased until the voltage reaches a certain value, in the case of the LED illumination 43 that does not have the limiting resistor 61, the increase of the voltage reaches a peak, and the current may flow. For this reason, it can be said that it is preferable to determine whether the LED illumination 43 has such a limiting resistor 61 or not. When the current I flowing through the circuit of FIG. 6 is increased by ΔI and the voltage V is increased by ΔV, the resistance value r of the limiting resistor 61 can be obtained by r≈ΔV / ΔI.

  FIG. 7 shows an example of current / voltage characteristics of the LED 60 of the LED illumination 43. In this case, the current I (mA) and the voltage Vf (V) are values shown in Table 2 below. FIG. 8 shows an example of current / voltage characteristics of the limiting resistor 61 of the LED illumination 43. In this case, the current I (mA) and the voltage Vr (V) are the values in the following Table 3, and the resistance is as small as 0.1. This corresponds to the case where the limiting resistor 61 is not provided.

このため、図７に示す電流・電圧特性を有すると、図８に示す電流・電圧特性とを合成電圧は図９に示す特性となる。すなわち、次の表４に示すように、電流Ｉ（ｍＡ）と電圧Ｖ（Ｖ）は、表２の値と表３の値との合成値となる。

Therefore, when the current / voltage characteristics shown in FIG. 7 are provided, the combined voltage of the current / voltage characteristics shown in FIG. 8 becomes the characteristics shown in FIG. That is, as shown in the following Table 4, the current I (mA) and the voltage V (V) are combined values of the values in Table 2 and Table 3.

制限抵抗６１の抵抗値ｒが低い場合、前記所定電圧（１２Ｖ）を掛けると、このＬＥＤ照明４３に大電流が流れ、ＬＥＤ６０が故障するおそれがある。このため、この装置では、電圧がある値（所定電圧の１２Ｖ）に達するまで、電流を上昇させた場合、制限抵抗６１が入っていない場合、電圧の上昇が頭打ちとなって、電流を流し過ぎとなる。なお、小型の照明装置では、図９の範囲Ｈでも故障するおそれがある。

When the resistance value r of the limiting resistor 61 is low, applying the predetermined voltage (12V) may cause a large current to flow through the LED illumination 43 and cause the LED 60 to fail. For this reason, in this device, when the current is increased until the voltage reaches a certain value (predetermined voltage of 12 V), when the limiting resistor 61 is not included, the increase of the voltage reaches a peak, and the current flows excessively. It becomes. Note that a small lighting device may fail even in the range H in FIG.

  Therefore, it is preferable to determine whether the connected LED illumination 43 does not include the limiting resistor 61. For this reason, in the present invention, in order to add the resistance value of the limiting resistor 61 to the determination criterion of the determining means 55, the limiting resistor 61 includes the current value flowing through the LED illumination 43 and the voltage value at this current value. As shown by the phantom line in FIG.

  A determination method in which the resistance value of the limiting resistor 61 is added to the determination element will be described with reference to FIG. In this case, the process starts from step S3 in FIG. 3 or step S13 in FIG. In step S21, the resistance value of the limiting resistor 61 is obtained. That is, when the current I is increased by ΔI and the voltage V is increased by ΔV, the resistance value r of the limiting resistor 61 can be obtained by r≈ΔV / ΔI.

  Next, in step S22, it is determined whether the resistance value r is r≈0. If r≈0 is not satisfied, the limiting resistor 61 is included, and the process returns to step S3 in FIG. 3 or step S13 in FIG. If r.apprxeq.0 in step S22, it means that the limiting resistor 61 is not included, and the process proceeds to step S23 to stop lighting and end.

  As described above, when the resistance value of the limiting resistor 61 is set to r, it is possible to prevent the current from flowing excessively to a device that does not have the limiting resistor 61 by determining whether r≈0 or not. Damage to the erroneous LED illumination 43 can be effectively avoided.

  In this case, in the LED illumination 43, even if the current I is changed, a characteristic common to general LEDs is used that the change in the forward voltage Vf of the LED 60 is negligibly small. For this reason, the resistance value r of the limiting resistor 61 can be measured without adding remodeling or the like to the commercially available LED lighting in the market, and damage to the LED lighting 43 due to a connection error can be prevented. In addition, the apparatus is not complicated and expensive.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the number of LED illuminations 43 may be at least one. Further, the predetermined voltage is not limited to 12V, and various set voltages can be used. The lighting system using this power supply device is not limited to a die bonder, and can be used for various devices that require lighting, and is optimal for devices that require lighting that is lit at a preset voltage.

  Further, the current / voltage characteristics of the LED 60 of the LED illumination 43 shown in FIG. 7 and the current / voltage characteristics of the limiting resistor 61 of the LED illumination 43 shown in FIG. 8 are not limited to those in the illustrated example. For this reason, the combined voltage of the LED 60 and the limiting resistor 61 shown in FIG. 9 is not limited to the illustrated example.

41 Controllers 42 and 56 Lighting power supply device 43 LED lighting 50 Constant current supply circuit (constant current supply means)
52 exploration means 54 setting means 55 judgment means 57 switching means 60 LED
61 Limiting resistor 62 Calculation means

Claims (7)

An application that replaces a constant voltage power source that applies a constant voltage to the illumination and that is connected to a lighting that lights at a preset voltage and a controller that is a driving source, and that applies a constant current to the illumination. A power supply device for lighting that illuminates the lighting with a constant current,
Probing in which a constant voltage power source is replaced with a constant current power source, and before the lighting is lit at the predetermined voltage, an exploration current is applied to the lighting and a current value necessary for applying the predetermined voltage is searched. Means,
A lighting power supply device comprising: a constant current supply unit that applies a lighting current having a current value searched by the searching unit to the lighting.   The illumination power supply apparatus according to claim 1, wherein the exploration means applies the exploration current until a predetermined voltage is applied to the illumination while sequentially increasing the exploration current from a minute current value.   The constant current supply means applies an exploration current applied to the illumination before lighting the illumination at the predetermined voltage and a lighting current for lighting the illumination at the predetermined voltage. The power supply device for illumination according to claim 1 or 2. Setting means for setting a maximum current value of the illumination;
A judgment means for judging whether the actually connected illumination is based on a preset judgment value of the illumination, or whether it corresponds to the illumination;
A predetermined voltage exploration mode in which a current value necessary for applying the predetermined voltage to the illumination is explored by the exploration means, and a lighting current of the explored current value is applied to the illumination;
The setting means and the judgment means enable mode selection with an illumination judgment mode for judging whether the actually connected illumination corresponds to the illumination based on a preset judgment value of illumination. 4. The illumination power supply device according to claim 1, further comprising a switching unit.   The illumination is an LED illumination consisting of only an LED and a limiting resistor or LED, and includes a calculation means for obtaining a resistance value of the limiting resistor based on a current value flowing through the LED illumination and a voltage value at the current value. 5. The illumination system according to claim 1, wherein when the resistance value is r, if r≈0, the LED illumination has no limiting resistance.   6. The illumination power supply device according to claim 1, wherein the illumination power supply device is used for image recognition illumination. A lighting power supply unit that is connected to a lighting that lights at a preset voltage and a controller that is a driving source, and that replaces a constant voltage power source that applies a constant voltage to the lighting with a constant current power source that applies a constant current to the lighting. An alternative method,
After releasing the connection between the constant voltage power supply and the illumination and the controller, the illumination power supply device according to any one of claims 1 to 4 is connected to the illumination and the controller.
Before lighting the illumination at the predetermined voltage, the exploration means applies an exploration current to the illumination to explore a current value necessary to apply the predetermined voltage,
An illumination power supply replacement method, wherein the constant current supply means applies a lighting current having a current value searched by the search means to the illumination.

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