JP5655181B2 - Solar simulator - Google Patents

Description

  The present invention relates to a light amount control device for controlling the light amount of a solar simulator and a solar simulator configured to include the light amount control device.

  A solar simulator is used to generate pseudo-sunlight necessary for evaluating the characteristics of solar cells (see Patent Document 1). In order to increase the measurement accuracy in characteristics measurement of solar cells and the like, the solar simulator is required to have short-term and long-term stability of irradiation light. The short-term stability of the irradiation light here is the temporal fluctuation of the intensity of the irradiation light. When the short-term stability of the irradiation light is low, there is a disadvantage that measurement accuracy of characteristics such as current-voltage characteristics is lowered. On the other hand, when the long-term stability of the irradiation light is low, the reliability of the absolute value of the characteristic measurement itself is lowered. In particular, when the solar simulator is provided with a lamp power source that is inferior in stability (for example, an inexpensive power source such as a switching power source), this inconvenience becomes more noticeable.

JP 2002-0487704 A

Accordingly, an object of the present invention is to provide a light amount control circuit suitable for improving the stability of irradiation light of a solar simulator.
Another object of the present invention is to provide a solar simulator excellent in stability of irradiation light.

One aspect of the solar simulator according to the present invention includes a light source, a switching power supply or a dropper circuit, a main power supply configured to be able to supply driving power to the light source, and controlling the light intensity of the light source. A light amount control circuit, wherein the light amount control circuit includes a driver unit connected in parallel to a power supply path connecting the main power source and the light source, and light intensity of the light source. Detecting means for generating a light amount signal corresponding to the light intensity, a driver control circuit for supplying a control signal to the driver unit based on the light amount signal, the power supply path and the driver And an open / close switch connected between the power supply path and a switch switching circuit for switching an open / close state of the open / close switch, and connected to the driver section from the power supply path. Are those current to be written to stabilize the light intensity of the light source by being increased or decreased in response to the control signal, the switch change circuit, the quantity of light input from the light detecting means at the start of lighting the light source When the signal exceeds a certain value , the opening / closing switch is switched from the open state to the closed state after a predetermined time has elapsed.

Another aspect of the solar simulator according to the present invention includes a light source, a switching power supply or a dropper circuit, a main power supply configured to supply driving power to the light source, and controlling the light intensity of the light source. A light amount control circuit for a solar simulator comprising: a driver unit connected in parallel to a power supply path connecting the main power source and the light source; and the main power source Is provided separately, a second power source connected in series with the driver unit, light detection means for detecting the light intensity of the light source and generating a light amount signal corresponding to the light intensity, and based on the light amount signal A driver control circuit that supplies a control signal to the driver unit, and an additional current superimposed by the driver unit on a current flowing through the power supply path is the control To stabilize the light intensity of the light source by being increased or decreased in accordance with the Patent.

Another aspect of the solar simulator according to the present invention includes a light source, a switching power supply or a dropper circuit, a main power supply configured to supply driving power to the light source, and controlling the light intensity of the light source. A light amount control circuit for providing a driver unit connected in parallel to a power supply path connecting the main power source and the light source, and the main power source, A second power source connected in series with the driver unit; light detecting means for detecting a light intensity of the light source to generate a light amount signal corresponding to the light intensity; and based on the light amount signal, the driver unit A driver control circuit for supplying a control signal, and a current drawn from the power supply path to the driver unit is increased or decreased according to the control signal, or a current flowing through the power supply path To stabilize the light intensity of the light source by adding current to be superimposed is increased or decreased in response to the control signal by the driver to.

The driver control circuit may include a high-pass filter that passes a high-frequency component of the light amount signal, and may be configured to generate the control signal based on the high-frequency component of the light amount signal.

The light detection means includes a light receiving element that generates an electric signal corresponding to the light intensity of the light source , and an amplifier circuit that generates the light amount signal by amplifying the electric signal output from the light receiving element. it may be configured to be so that.

The solar simulator of the present invention includes an integrator lens disposed so that light from the light source can be incident thereon, a reflection mirror disposed so as to be able to reflect light that has passed through the integrator lens, and the integrator lens and the reflection mirror. You may further provide the light branching means arrange | positioned between, and the light-receiving part arrange | positioned so that the light branched by the said light branching means can enter.

The solar simulator of the present invention may be configured to further include a diffusion plate disposed between the light branching unit and the light receiving unit. Moreover, you may comprise so that the optical shutter arrange | positioned between the said light branching means and the said reflective mirror may be further provided.

According to the present invention, when the light intensity of the light source increases or decreases, the current supplied to the light source is variably controlled following the increase and decrease, so that the stability of the irradiation light of the solar simulator can be improved. Even if an inexpensive main power supply that supplies current to the light source is used, the light emitted from the light source can be stabilized as if a high-performance but expensive main power supply is used. Thus, the cost reduction of the solar simulator can be achieved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing an overall configuration of a solar simulator according to an embodiment of the present invention. A solar simulator 1 shown in FIG. 1 includes a xenon lamp (light source) 10, an elliptical condensing mirror 12, a reflecting mirror 14, an integrator lens 16, a light branching unit 18, a diffuser plate 20, a light receiving unit 22, a shutter 24, a reflecting mirror 26, The lens 28 and the main power supply 32 are included. Although not shown in FIG. 1, the solar simulator 1 also includes a light amount control circuit for stabilizing the light amount of the xenon lamp 10 (details of the light amount control circuit will be described later).

  In the solar simulator 1 described above, the light emitted from the xenon lamp 10 is collected by the elliptical collecting mirror 12. The collected light is changed in its optical path by the reflection mirror 14 and enters the integrator lens 16. By passing through the integrator lens 16, the intensity distribution of the light is made uniform.

  The light that has passed through the integrator lens 16 enters the light branching means 18. Then, a partial component of the light branches, passes through the diffusion plate 20 and enters the light receiving unit 22. Here, the “light branching means” means a means capable of branching light into a plurality of parts, for example, a half mirror or a beam splitter. The light branching unit 18 guides a part of the light to the light receiving unit 22. Here, the “light receiving portion” is, for example, a light receiving element (photoelectric conversion element) that generates an electrical signal corresponding to the light intensity.

  By disposing the diffusing plate 20 in the preceding stage of the light receiving unit 22, it is possible to measure light evenly at the central portion of the light, and it is possible to adjust the area to be measured by changing the size of the diffusing plate 20. . When the diffuser plate 20 is not used, only the central part can be measured with a spot.

  Here, the relationship between the diffusion plate and the light incident on the diffusion plate will be described in detail with reference to FIG. As shown in FIG. 2, the diffusion plate 20 is arranged corresponding to the traveling direction of the light L branched by the light branching means 18. At this time, in the light L, a component in the vicinity of the center including the principal ray direction m (center component; colored and displayed in the drawing) is incident on the diffusion plate 20, and an outer edge component is not incident on the diffusion plate 20. It is desirable to dispose the diffusion plate 20 on the surface. The central component including the principal ray direction m of the light L is incident on the diffuser plate 20 and guided to the light receiving unit 22, so that the diffuser plate 20 is not used (in the case of spot photometry), or conversely all the light L Compared with the case where a component is incident, the stability of light amount control (details will be described later) can be improved.

  On the other hand, the light passing through the light branching means 18 is changed in optical path by the reflection mirror 26 and is incident on the lens 28. The light incident on the lens 28 is converted into substantially parallel light by the lens 28 and is irradiated onto a predetermined irradiation surface 30. Thereby, parallel and uniform irradiation light is obtained on the irradiation surface 30. By disposing an object to be measured such as a solar cell on the irradiation surface 30, various characteristic measurements using irradiation light can be performed.

  The main power supply 32 supplies driving power to the xenon lamp 10 and also supplies power to other components of the solar simulator 1 (not shown). Examples of the power source that can be used as the main power source 32 include a switching type and a dropper type.

  Here, switching type power supplies, which are often used only for simple applications, generate ripple current due to their structure, poor response, and short-term stability. Therefore, there is an advantage that the power transformer is small and lightweight, and the cost can be suppressed. On the other hand, the latter dropper type power supply has high stability and can obtain stable irradiation light, but on the other hand, since it is inefficient, a large heat sink is required and the operation cost is likely to increase. In the present embodiment, a high-performance dropper-type power supply is used regardless of whether the switching method is adopted as the main power supply 32 or the case where a dropper method with relatively poor performance is adopted. In order to realize the stability of the irradiation light equivalent to the case where it is adopted, a light amount control circuit described in detail below is provided.

  Next, the light quantity control circuit according to the present embodiment will be described in detail. The light quantity control circuit according to the present embodiment is classified into three types according to the difference in the principle employed. Hereinafter, each embodiment will be described.

(First embodiment of light quantity control circuit)
FIG. 3 is a diagram illustrating a configuration of the light amount control circuit according to the first embodiment. The light amount control circuit 2 shown in FIG. 3 controls the light amount of the xenon lamp 10 by bypassing a part of the current supplied from the power supply 32 to the xenon lamp 10 and controlling the amount thereof. It has the feature that it has very little power and can be easily retrofitted to existing equipment. The light amount control circuit 2 includes a light receiving element 34, a photoelectric conversion circuit 35, an open / close switch 36, a switch switching circuit 37, a driver unit 38, and a driver control circuit 40.

  The light receiving element (sensor) 34 receives a partial component of the light emitted from the xenon lamp 10 and generates an electrical signal corresponding to the light intensity. In the present embodiment, the light receiving element 34 corresponds to the light receiving unit 22 described above.

  The photoelectric conversion circuit (amplifier circuit) 35 is connected to the output terminal of the light receiving element 34 and generates a light amount signal by amplifying the output signal of the light receiving element 34. FIG. 4 shows a configuration example of the photoelectric conversion circuit 35. The photoelectric conversion circuit 35 shown in FIG. 4 includes an operational amplifier 42 and a resistance element 44 connected between one input terminal (minus side) and the output terminal of the operational amplifier 42.

  The open / close switch 36 is an open / close element such as a relay, and is provided in the middle of a circuit connecting the xenon lamp 10 and the driver unit 38.

  The switch switching circuit 37 performs control to switch the open / close state of the open / close switch 36. The switch switching circuit 37 in this embodiment receives a light amount signal output from the photoelectric conversion circuit, and switches the open / close switch 36 to an open state or a closed state based on the light amount signal. For example, when the light amount signal exceeds a certain value (corresponding to lamp lighting), the switch switching circuit 37 switches the open / close switch 36 to a closed state after a certain time has elapsed. Thereby, since the open / close switch 36 is in an open state when the lighting of the solar simulator 1 is started, the driver unit 38 is disconnected from the circuit even when a high voltage is instantaneously applied to the xenon lamp 10 at the start of lighting. In addition, the driver portion 38 can be prevented from being damaged. Further, by separating the driver unit 38 from the circuit when the xenon lamp 10 is turned on, an effect of preventing the driver unit 38 from affecting lamp lighting control is also expected. Such a switch switching circuit 37 can be configured, for example, by combining a comparator that compares the light amount signal with a predetermined reference signal and a delay circuit that delays the signal by a predetermined time.

  The driver unit 38 is connected in parallel with the xenon lamp 10 and is configured to be able to draw a part of the current supplied from the power supply 32 to the xenon lamp 10. The amount (magnitude) of current flowing through the driver unit 38 is controlled based on a control signal supplied from the driver control circuit 40.

  The driver control circuit 40 receives the light amount signal output from the photoelectric conversion circuit 35 and supplies the above-described control signal to the driver unit 38 based on the light amount signal. A detailed configuration example of the driver control circuit 40 will be described below.

  FIG. 5 is a diagram illustrating a configuration example (fluctuation correction control) of the driver control circuit. The driver control circuit 40 of the configuration example shown in FIG. 5 extracts the AC component of the light amount signal and controls the current flowing through the driver unit 38 based on this to compensate for short-time light amount fluctuations. Yes. Specifically, the light quantity signal is input to a high-pass filter 42 including a resistance element (R) and a capacitance element (C). The high-pass filter 42 passes the high frequency component (fluctuation component) of the light amount signal. The amplitude of the high frequency component of the light quantity signal that has passed through the high pass filter 42 is adjusted by the gain adjustment circuit 44 and input to the buffer circuit 46. The buffer circuit 46 has a function of reducing the output impedance. On the other hand, the idling current adjustment circuit 48 receives the reference voltage from the reference voltage generator 50 and generates an idling current. This idling current is for allowing a constant current to flow through the driver section 38 (that is, to be drawn) even when there is no fluctuation in the amount of light. The buffer circuit 52 has a function of reducing the output impedance of the idling current. The output of the buffer circuit 52 is coupled with the output of the buffer circuit 46 through a resistor element 53 in the subsequent stage and a capacitor, and the fluctuation component (AC) is superimposed on the idling current (DC) to become an instruction voltage. This instruction voltage is input to one input terminal (plus side) of the operational amplifier 54. The output signal of the operational amplifier 54 is input to the base of the transistor 58 via the resistance element 56. The transistor 58 operates as an emitter follower and drives the driver unit 38. The driver unit 38 is configured by combining, for example, a two-stage transistor and a resistance element as shown in the figure, and allows a current corresponding to an instruction signal from the driver control circuit 40 to flow.

  FIG. 6 is a diagram illustrating another configuration example (constant light amount control) of the driver control circuit. The driver control circuit 40a in the configuration example shown in FIG. 6 is intended to correct a long-time light amount change in addition to a short-time light amount fluctuation. The driver control circuit 40a in the configuration example shown in FIG. 6 basically has the same configuration as the driver control circuit 40 described above. Common reference numerals are used for configurations common to both, and detailed description thereof is omitted. Unlike the driver control circuit 40 described above, the driver control circuit 40a of this example does not include a high-pass filter for extracting a high-frequency component of the light amount signal. For this reason, the light quantity signal is directly input to the gain adjustment circuit 44. In this example, the variable resistor included in the idling current adjusting circuit 48 functions as a light amount setting circuit. The output signal from the gain adjustment circuit 44 and the output signal from the variable resistor (light quantity setting circuit) of the idling current adjustment circuit 48 are input to the error amplifier 60. The error amplifier 60 controls the instruction voltage so that the light amount signal matches the light amount setting value. The operations of the operational amplifier 54, the resistance element 56, and the transistor 58 in the subsequent stage of the error amplifier 60 are as described above.

(Second embodiment of light quantity control circuit)
FIG. 7 is a diagram illustrating a configuration of a light amount control circuit according to the second embodiment. The light amount control circuit 2a shown in FIG. 7 controls the light amount of the xenon lamp 10 by superimposing a current from another power source 142 on the current supplied from the power source 32 to the xenon lamp 10 and controlling the amount. It is. The light amount control circuit 2a includes a light receiving element 134, a photoelectric conversion circuit 135, an open / close switch 136, a switch switching circuit 137, a driver unit 138, a driver control circuit 140, and a power supply 142. The photoelectric conversion element 134, the photoelectric conversion circuit 135, the open / close switch 136, and the switch switching circuit 137 are the same as those in the first embodiment described above, and detailed description thereof is omitted. This light quantity control circuit 2a can be used for control in which the xenon lamp 10 is always lit with a low current and the light quantity is increased only during the measurement period.

  The driver unit 138 is connected in parallel with the xenon lamp 10 and is connected in series with the power source 142, and is configured to be able to supply current from the power source 142 to the xenon lamp 10. The amount (magnitude) of current flowing through the driver unit 138 is controlled based on a control signal supplied from the driver control circuit 140.

  The driver control circuit 140 receives the light amount signal output from the photoelectric conversion circuit 135 and supplies the above-described control signal to the driver unit 138 based on the light amount signal. A detailed configuration example of the driver control circuit 140 will be described below.

  FIG. 8 is a diagram illustrating a configuration example (fluctuation correction control) of the driver control circuit. The driver control circuit 140 in the configuration example shown in FIG. 8 extracts the AC component of the light amount signal and controls the current flowing through the driver unit 138 based on the extracted AC component, thereby compensating for the short-time light amount fluctuation. Yes. The basic configuration of the driver control circuit 140 shown in FIG. 8 is the same as that of the driver control circuit 40 according to the first embodiment described above. Common reference numerals are used for configurations common to both, and detailed description thereof is omitted. The difference between the driver control circuit 140 of this example and the driver control circuit 40 described above is the configuration of a high-pass filter and a gain adjustment circuit. Specifically, the high-pass filter 142 in the driver control circuit 140 of this example is configured by connecting a capacitive element (front stage side) and a resistance element (back stage side) in series. In addition, the gain adjustment circuit 144 in the driver control circuit 140 of this example has a ground potential input to the positive input end of the operational amplifier and a signal (high-frequency component of the light amount signal) that has passed through the high-pass filter 142 is input to the negative input end. (Ie, inverting amplification).

  FIG. 9 is a diagram illustrating another configuration example (constant light amount control) of the driver control circuit. The driver control circuit 140a of the configuration example shown in FIG. 9 is intended to correct a long-time light amount change in addition to a short-time light amount fluctuation. The basic configuration of the driver control circuit 140a shown in FIG. 9 is the same as that of the driver control circuit 40a according to the first embodiment described above. Common reference numerals are used for configurations common to both, and detailed description thereof is omitted. The difference between the driver control circuit 140a of this example and the driver control circuit 40a described above is the configuration of the gain adjustment circuit. Specifically, the gain adjustment circuit 144 in the driver control circuit 140 of this example has a ground potential input to the plus side input terminal of the operational amplifier, as in the case of the driver control circuit 140 shown in FIG. A high-frequency component of the light amount signal is input to the end (that is, inversion amplification).

(Third embodiment of light quantity control circuit)
FIG. 10 is a diagram illustrating a configuration of a light amount control circuit according to the third embodiment. The light quantity control circuit 2b shown in FIG. 10 is a combination (push-pull method) of the first embodiment (bypass method) and the second embodiment (superimposition method) described above. Specifically, the light amount control circuit 2b bypasses a part of the current supplied from the power source 32 to the xenon lamp 10, and controls the amount of the light to control the light amount of the xenon lamp 10, and from the power source 32 to the xenon lamp. The amount of light of the xenon lamp 10 is controlled by superimposing a current from another power source 242 on the current supplied to the lamp 10 and controlling the amount. The light amount control circuit 2b includes a light receiving element 234, a photoelectric conversion circuit 235, an open / close switch 236, a switch switching circuit 237, a driver unit 238, a driver control circuit 240, and a power source 242. The photoelectric conversion element 234, the photoelectric conversion circuit 235, the open / close switch 236, and the switch switching circuit 237 are the same as those in the first embodiment described above, and detailed description thereof is omitted.

  The driver unit 238 is connected in parallel with the xenon lamp 10 and is connected in series with the power source 242, configured to be able to supply current from the power source 242 to the xenon lamp 10, and supplied from the power source 32 to the xenon lamp 10. It is possible to draw a part of the current that is generated. The amount (magnitude) of current flowing through the driver unit 238 is controlled based on a control signal supplied from the driver control circuit 240.

  The driver control circuit 240 receives the light amount signal output from the photoelectric conversion circuit 235 and supplies the above-described control signal to the driver unit 238 based on the light amount signal. A detailed configuration example of the driver control circuit 240 will be described below.

  FIG. 11 is a diagram illustrating a configuration example (fluctuation correction control) of the driver control circuit. The driver control circuit 240 of the configuration example shown in FIG. 11 extracts the AC component of the light amount signal and controls the current flowing through the driver unit 238 based on the extracted AC component, thereby compensating for short-time light amount fluctuations. Yes. The basic configuration of the driver control circuit 240 shown in FIG. 11 is the same as that of the driver control circuit 140 according to the second embodiment described above. Common reference numerals are used for configurations common to both, and detailed description thereof is omitted. The driver control circuit 240 of this example is different from the driver control circuit 140 described above in that it does not include the idling current adjustment circuit 48, the reference voltage generator 50, and the buffer circuit 52, and the transistor 58 in the last stage has a push-pull configuration. Of the emitter follower 258. The emitter follower 258 at the last stage draws current from the driver unit 238 or applies (superimposes) current to the driver unit 238 in accordance with a signal given through the resistance element 56.

  FIG. 12 is a diagram illustrating another configuration example (constant light amount control) of the driver control circuit. The driver control circuit 240a of the configuration example shown in FIG. 12 is intended to correct a long-time light amount change in addition to a short-time light amount fluctuation. The basic configuration of the driver control circuit 240a shown in FIG. 12 is the same as that of the driver control circuit 140a according to the second embodiment described above. Common reference numerals are used for configurations common to both, and detailed description thereof is omitted. The driver control circuit 240a of this example is different from the driver control circuit 140a described above in that the last stage transistor 58 is replaced with an emitter follower 258 having a push-pull configuration. The emitter follower 258 at the last stage draws current from the driver unit 238 or applies (superimposes) current to the driver unit 238 in accordance with a signal given through the resistance element 56.

  According to the present embodiment as described above, when the light intensity of the lamp increases or decreases, the current supplied to the lamp is variably controlled following the increase and decrease, so that the stability of the irradiation light of the solar simulator can be improved. Become. Even if an inexpensive but inferior stability (eg switching power supply) is used as the main power supply for supplying current to the lamp, irradiation with the lamp is equivalent to using a high-performance but expensive main power supply. Light can be stabilized, and the cost reduction of the solar simulator can be achieved.

  Moreover, since the light quantity control circuit according to the present embodiment has a circuit configuration independent of the main power source of the solar simulator main body, the existing solar simulator having a main power source (switching method, dropper method, etc.) having poor performance is used. By additionally mounting, it is possible to improve the stability of irradiation light.

  In addition, this invention is not limited to the content of embodiment mentioned above, In the range of the summary of this invention, it can change and implement variously. For example, in the above-described embodiment, the light receiving element is directly used as the light receiving unit of the solar simulator. However, the light receiving unit may be a means such as one end side of an optical waveguide such as an optical fiber. In this case, a light receiving element is provided on the other end side of the optical waveguide, and the light received at one end side of the optical waveguide is guided to the light receiving element on the other end side of the optical waveguide, whereby an electric signal corresponding to the light intensity is obtained. Can be obtained. According to this configuration, an effect of avoiding noise can be expected. Further, it is effective when the distance between the light receiving element and the lamp house (housing) is large. In addition, the output signal of the light receiving element or the light amount signal obtained by amplifying it is used to display the lighting / extinguishing status of the lamp, to detect fluctuations in the light amount, deterioration of the lamp, etc., and to alert the operator Can also be issued.

It is a mimetic diagram showing the whole solar simulator composition of one embodiment. It is a schematic diagram explaining the relationship between a diffuser plate and the light which injects into this diffuser plate. It is a figure which shows the structure of the light quantity control circuit which concerns on 1st Embodiment. It is a figure which shows the structural example of a photoelectric conversion circuit. It is a figure which shows the structural example (fluctuation correction control) of the driver control circuit in 1st Embodiment. It is a figure which shows the other structural example (constant light quantity control) of the driver control circuit in 1st Embodiment. It is a figure which shows the structure of the light quantity control circuit which concerns on 2nd Embodiment. It is a figure which shows the structural example (fluctuation correction control) of the driver control circuit in 2nd Embodiment. It is a figure which shows the other structural example (constant light quantity control) of the driver control circuit in 2nd Embodiment. It is a figure which shows the structure of the light quantity control circuit which concerns on 3rd Embodiment. It is a figure which shows the structural example (fluctuation correction control) of the driver control circuit in 3rd Embodiment. It is a figure which shows the other structural example (constant light quantity control) of the driver control circuit in 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Solar simulator 2 ... Light quantity control circuit 10 ... Xenon lamp (light source)
DESCRIPTION OF SYMBOLS 12 ... Ellipse condensing mirror 14 ... Reflection mirror 16 ... Integrator lens 18 ... Light branching means 20 ... Diffusing plate 22 ... Light-receiving part 24 ... Shutter 26 ... Reflection mirror 28 ... Lens 30 ... Irradiation surface 32 ... Main power supply 34 ... Light receiving element 35 ... Photoelectric conversion circuit 38 ... Driver unit 40 ... Driver control circuit

Claims (8)

A light source;
A main power source having a switching type or dropper type circuit and configured to be able to supply driving power to the light source;
A solar simulator comprising a light amount control circuit for controlling the light intensity of the light source,
The light amount control circuit includes:
A driver unit connected in parallel to a power supply path connecting the main power source and the light source;
Light detection means for detecting the light intensity of the light source and generating a light amount signal corresponding to the light intensity;
A driver control circuit for supplying a control signal to the driver unit based on the light amount signal;
An open / close switch connected between the power supply path and the driver unit;
A switch switching circuit for switching the open / close state of the open / close switch,
The current drawn from the power supply path to the driver unit is increased or decreased according to the control signal to stabilize the light intensity of the light source,
The switch switching circuit switches the open / close switch from an open state to a closed state after a predetermined time has elapsed when the light amount signal input from the light detection unit exceeds a certain value at the start of lighting of the light source ,
Solar simulator. A light source;
A main power source having a switching type or dropper type circuit and configured to be able to supply driving power to the light source;
A solar simulator comprising a light amount control circuit for controlling the light intensity of the light source,
The light amount control circuit includes:
A driver unit connected in parallel to a power supply path connecting the main power source and the light source;
A second power source provided separately from the main power source and connected in series with the driver unit;
Light detection means for detecting the light intensity of the light source and generating a light amount signal corresponding to the light intensity;
A driver control circuit for supplying a control signal to the driver unit based on the light amount signal,
Stabilizing the light intensity of the light source by increasing or decreasing the additional current superimposed by the driver unit with respect to the current flowing through the power supply path according to the control signal;
Solar simulator. A light source;
A main power source having a switching type or dropper type circuit and configured to be able to supply driving power to the light source;
A light amount control circuit for controlling the light intensity of the light source,
The light amount control circuit includes:
A driver unit connected in parallel to a power supply path connecting the main power source and the light source;
A second power source provided separately from the main power source and connected in series with the driver unit;
Light detection means for detecting the light intensity of the light source and generating a light amount signal corresponding to the light intensity;
A driver control circuit for supplying a control signal to the driver unit based on the light amount signal,
The current drawn from the power supply path to the driver unit is increased or decreased according to the control signal, or the additional current superimposed by the driver unit on the current flowing through the power supply path is determined according to the control signal. Stabilize the light intensity of the light source by being increased or decreased,
Solar simulator. The driver control circuit includes a high-pass filter that allows a high-frequency component of the light amount signal to pass therethrough, and generates the control signal based on the high-frequency component of the light amount signal.
The solar simulator of any one of Claims 1 thru | or 3. The light detection means includes
A light receiving element that generates an electrical signal corresponding to the light intensity of the light source;
An amplification circuit that generates the light amount signal by amplifying the electrical signal output from the light receiving element;
The solar simulator of any one of Claims 1 thru | or 4 which has these. An integrator lens arranged so that light from the light source can be incident thereon;
A reflection mirror arranged to reflect the light that has passed through the integrator lens;
A light branching means disposed between the integrator lens and the reflecting mirror;
A light receiving portion arranged so that the light branched by the light branching means can be incident;
The solar simulator according to claim 1, further comprising:   The solar simulator according to claim 6, further comprising a diffuser plate disposed between the light branching unit and the light receiving unit.   The solar simulator according to claim 7, further comprising an optical shutter disposed between the light branching unit and the reflection mirror.

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