Control circuit and power supply device

Abstract

To provide a control circuit and a power supply device that can easily control dimming and color adjustment with a simple configuration.SOLUTION: A control circuit 1 is a control circuit 1 that performs dimming color control of a first light-emitting element 10 and a second light-emitting element 20, and is equipped with a constant current control unit 30 and a current ratio control unit 40. The first light-emitting element 10 has a constant voltage characteristic VC, and a first current I1 controlled within a first current control range on the basis of the constant voltage characteristic VC at a first voltage V1 flows. The second light-emitting element 20 has a constant resistance characteristic RC that becomes a constant resistance in a voltage region higher than a second voltage V2, and a second current I2 controlled within a second current control range on the basis of the constant resistance characteristic RC flows. The constant current control unit 30 performs constant current control on a total current IT of the first current I1 and the second current I2. The current ratio control unit 40 controls the current ratio of the first current I1 and the second current I2 by controlling the constant resistance characteristic RC.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a control circuit and a power supply device. [Background technology]

[0002] As a conventional technique, lighting devices using light-emitting elements such as LEDs are widely used. For example, there are inventions disclosed in Patent Document 1, Patent Document 2, etc. However, it has been difficult to easily control dimming and color adjustment with a simple configuration, and there has been a demand for a control circuit and a power supply device that can easily control dimming and color adjustment with a simple configuration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent application 2013-526251 publication [Patent Document 2] Patent application 2016-69256 publication Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventionally, there has been a problem in that it is not possible to easily control dimming and color adjustment with a simple configuration.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a control circuit and a power supply device that can easily control dimming and color adjustment with a simple configuration. [Means for solving the problem]

[0006] The control circuit of the present invention is a control circuit that performs dimming color control of a first light-emitting element and a second light-emitting element, and is equipped with a constant current control unit and a current ratio control unit, wherein the first light-emitting element has a constant voltage characteristic, and a first current controlled within a first current control range based on the constant voltage characteristic flows at a first voltage, the second light-emitting element has a constant resistance characteristic that becomes a constant resistance in a voltage region higher than a second voltage, and a second current controlled within a second current control range based on the constant resistance characteristic flows, the constant current control unit controls the sum of the first current and the second current to be a constant current, and the current ratio control unit controls the current ratio of the first current and the second current by controlling the constant resistance characteristic.

[0007] The constant resistance characteristic in the control circuit according to the present invention is characterized in that it is controlled by changing the impedance of the impedance changing section connected to the second light emitting element, based on the control of the current ratio by the current ratio control section.

[0008] The impedance change section in the control circuit according to the present invention is characterized in that it is connected in series to the second light emitting element.

[0009] The second voltage in the control circuit according to the present invention is characterized in that it is controlled by a second voltage change by a second voltage changer connected to the second light-emitting element, based on the control of the current ratio by a current ratio control unit.

[0010] The second voltage change section in the control circuit according to the present invention is characterized in being connected in parallel to at least a part of the second light emitting element.

[0011] The constant resistance characteristic in the control circuit of the present invention is characterized in that it is controlled by changing the impedance of the impedance change unit connected to the second light-emitting element based on the control of the current ratio by the current ratio control unit, and the second voltage is controlled by changing the second voltage by the second voltage change unit connected to the second light-emitting element based on the control of the current ratio by the current ratio control unit.

[0012] The first light-emitting element and / or the second light-emitting element in the control circuit of the present invention is characterized in that it is configured to include a plurality of elements each emitting a different light color, the impedance control unit is connected in series to the second light-emitting element, and the second voltage change unit is connected in parallel to at least a portion of the second light-emitting element.

[0013] The impedance changing section and / or the second voltage changing section in the control circuit according to the present invention is characterized in that it is configured using a voltage-driven semiconductor switch or a current-driven semiconductor switch.

[0014] The voltage-driven semiconductor switch or the current-driven semiconductor switch in the control circuit according to the present invention is characterized in that it is driven by a continuous control signal or an intermittent control signal.

[0015] The power supply device of the present invention comprises a control circuit, a choke coil, and a semiconductor switching element, wherein the choke coil is electrically connected to a first light-emitting element and a second light-emitting element, and the semiconductor switching element is electrically connected to the first light-emitting element and the second light-emitting element, and is driven based on a constant current control signal generated by a constant current control unit.

[0016] The control by the constant current control unit and / or the control by the current ratio control unit in the power supply device of the present invention is characterized in that it is performed based on detection information from a sensor that detects either the illuminance, temperature, humidity, human presence, or brain waves emitted by a human in the environment in which the first light-emitting element and / or the second light-emitting element are installed. Effect of the Invention

[0017] According to the present invention, it is possible to provide a control circuit capable of easily controlling dimming and color adjustment with a simple configuration.

[0018] According to the present invention, it is possible to provide a power supply device that can easily control dimming and color adjustment with a simple configuration and can perform dimming and color adjustment control with high precision and a wide variety of colors. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1(a) shows a control circuit according to an embodiment of the present invention, and FIG. 1(b) shows current values ​​during constant current control and current ratio control according to an embodiment of the present invention. [Diagram 2] FIG. 2(a) shows a control circuit to which an impedance change unit according to an embodiment of the present invention is connected, and FIG. 2(b) shows current values ​​during constant current control and current ratio control according to an embodiment of the present invention. [Diagram 3] 4 shows a connection relationship between a second light-emitting element and an impedance changing unit in the control circuit according to the embodiment of the present invention. [Figure 4] FIG. 4(a) shows a control circuit to which a second voltage change unit according to an embodiment of the present invention is connected, and FIG. 4(b) shows current values ​​during constant current control and current ratio control according to an embodiment of the present invention. [Diagram 5] 4 shows a connection relationship between a second light-emitting element and an impedance changing unit in the control circuit according to the embodiment of the present invention. [Figure 6] FIG. 6(a) shows a control circuit to which an impedance changing unit and a second voltage changing unit according to an embodiment of the present invention are connected, and FIG. 6(b) shows current values ​​during constant current control and current ratio control according to an embodiment of the present invention. [Figure 7] 1 shows a control circuit in which a first light-emitting element and a second light-emitting element according to an embodiment of the present invention are composed of a plurality of elements each emitting a different light color, and an impedance change unit and a second voltage change unit are connected. [Figure 8] 1 shows a control circuit to which a voltage-driven semiconductor switch or a current-driven semiconductor switch according to an embodiment of the present invention is connected. [Figure 9] 1 shows an example in which a voltage-driven semiconductor switch or a current-driven semiconductor switch according to an embodiment of the present invention is controlled by a control signal. [Figure 10] 1 illustrates a power supply device according to an embodiment of the present invention. [Figure 11] 1 illustrates a power supply device to which a sensor according to an embodiment of the present invention is connected; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] An example of an embodiment will be described below. Note that the present invention is not limited to the embodiment described below, and appropriate modifications can be made without departing from the spirit and scope of the invention.

[0021] As shown in FIG. 1, the control circuit 1 performs dimming color control of the first light-emitting element 10 and the second light-emitting element 20, and includes a constant current control unit 30 and a current ratio control unit 40. The first light-emitting element 10 has a constant voltage characteristic VC, and a first current I1 controlled within a first current control range based on the constant voltage characteristic VC flows at a first voltage V1. The second light-emitting element 20 has a constant resistance characteristic RC that becomes a constant resistance in a voltage region higher than a second voltage V2, and a second current I2 controlled within a second current control range based on the constant resistance characteristic RC flows. The constant current control unit 30 controls the sum current IT of the first current I1 and the second current I2 to be a constant current. The current ratio control unit 40 controls the current ratio of the first current I1 and the second current I2 by controlling the constant resistance characteristic RC.

[0022] This makes it possible to provide a control circuit capable of easily controlling dimming and color adjustment with a simple configuration. It is preferable that the second voltage V2 is controlled in a voltage range lower than the first voltage V1 by, for example, controlling the constant resistance characteristic RC by changing the impedance of the impedance changing unit 50 described later or by changing the second voltage of the second voltage changing unit 60. In this case, in addition to the above-mentioned effects, it becomes possible to easily control dimming and color adjustment with fine variations. The constant resistance characteristic RC is, for example, a characteristic in which the resistance value changes according to the change in voltage (change in the range from the second voltage V2 to the first voltage V1) or the change in current (change in the second current control range) in the second light-emitting element 20, as shown in FIG. 1(b). The control of the constant resistance characteristic RC is a control that changes the slope L shown in FIG. 1(b), FIG. 2(b), FIG. 4(b), and FIG. 6(b). In other words, the control that changes the constant resistance characteristic RC can be performed by changing the slope L.

[0023] 2, the constant resistance characteristic RC1 is controlled by changing the impedance of the impedance changing unit 50 connected to the second light-emitting element 20a, based on the control of the current ratio by the current ratio control unit 30. The change in impedance by the impedance changing unit 50 changes the constant resistance characteristic RC1 of the second light-emitting element 20a, and the current and second voltage V2 of the second light-emitting element 20a change. The change in impedance by the impedance changing unit 50 changes the slope L, changing the constant resistance characteristic RC1 and changing the second voltage V2.

[0024] This makes it possible to easily and stably control light and color adjustment with a wide range of subtle variations.

[0025] As shown in FIG. 3, the impedance changer 50a is connected in series to the second light emitting element 20b.

[0026] As a result, the impedance change unit 50a performs the above-mentioned impedance change while being connected in series to the second light-emitting element 20b, so in addition to the above-mentioned effects, it is possible to provide a control circuit that can easily control dimming and color adjustment with an even simpler configuration.

[0027] As shown in FIG. 4, the second voltage V2a is controlled by the second voltage change of the second voltage changer 60 connected to the second light emitting element 20c, based on the control of the current ratio by the current ratio controller 40a.

[0028] This not only achieves the above-mentioned effects, but also makes it possible to easily control dimming and color adjustment with fine variations. It also makes it easy to control the current ratio over a wide range and with high sensitivity. For example, increasing the difference between the second voltage V2 and the first voltage V1 makes the slope L smaller, and decreasing the difference between the second voltage V2 and the first voltage V1 makes the slope L larger, enabling current ratio control over a wide range and with high sensitivity (gain control of current ratio control by impedance change can be facilitated). In other words, by combining not only impedance change but also second voltage change, current ratio control over a wider range and with high sensitivity can be easily achieved.

[0029] As shown in FIG. 5, the second voltage changer 60a is connected in parallel to at least a portion of the second light emitting element 20d.

[0030] As a result, the second voltage change unit 60a performs the second voltage change in a configuration connected in parallel to at least a part of the second light-emitting element 20d, and in addition to the above-mentioned effects, a control circuit capable of easily controlling dimming and color adjustment with an even simpler configuration can be provided. Also, current ratio control with a wide range and high sensitivity becomes easy. For example, when the difference between the second voltage V2 and the first voltage V1 is increased, the slope L becomes smaller, and when the difference between the second voltage V2 and the first voltage V1 is decreased, the slope L becomes larger, so that current ratio control with a wide range and high sensitivity becomes possible (gain control of current ratio control by impedance change can be facilitated.) In other words, by combining not only impedance change but also second voltage change, current ratio control with a wider range and high sensitivity becomes easy.

[0031] As shown in Figure 6, the constant resistance characteristic RC2 is controlled by changing the impedance by the impedance change unit 50b connected to the second light-emitting element 20e based on the control of the current ratio by the current ratio control unit 40b, and the second voltage V2b is controlled by changing the second voltage by the second voltage change unit 60b connected to the second light-emitting element 20e based on the control of the current ratio by the current ratio control unit 40b.

[0032] Since this control is a composite control of the impedance change and the second voltage change, in addition to the above-mentioned effects, it is possible to easily control dimming and color adjustment with a wide variety of details. This makes it possible to easily control dimming and color adjustment with a simple configuration, and furthermore, it is possible to provide a control circuit capable of controlling dimming and color adjustment with high accuracy and a wide variety of colors. When a power supply circuit is configured using such a control circuit, in addition to the above-mentioned effects, it is possible to easily control dimming and color adjustment with a wide variety of details. In addition, it is easy to control the current ratio in a wide range and with high sensitivity. For example, when the difference between the second voltage V2 and the first voltage V1 is increased, the slope L becomes smaller, and when the difference between the second voltage V2 and the first voltage V1 is decreased, the slope L becomes larger, so that it is possible to control the current ratio in a wide range and with high sensitivity (gain control of the current ratio control by the impedance change can be facilitated.) In other words, by combining not only the impedance change but also the second voltage change, it is easy to control the current ratio in a wide range and with high sensitivity.

[0033] As shown in FIG. 7, the first light-emitting element 10a and / or the second light-emitting element 20f is configured to include a plurality of elements each emitting a different light color, the impedance control unit 50c is connected in series to the second light-emitting element 20f, and the second voltage change unit 60c is connected in parallel to at least a portion of the second light-emitting element 20f.

[0034] This makes it possible to easily control dimming and color adjustment with a simple configuration, and furthermore, it is possible to provide a control circuit capable of controlling dimming and color adjustment with high precision and a wide variety of colors. When a power supply circuit is configured using such a control circuit, in addition to the above-mentioned effects, it becomes possible to easily control dimming and color adjustment with fine variation.

[0035] 8, the impedance changing unit 50d and / or the second voltage changing unit 60d are configured using voltage-driven semiconductor switches (VSW, VSW1) or current-driven semiconductor switches (ISW, ISW1). The voltage-driven semiconductor switches (VSW, VSW1) may be implemented using field-effect transistors such as MOSFETs. The current-driven semiconductor switches (ISW, ISW1) may be implemented using bipolar transistors.

[0036] This makes it possible to provide a power supply device that can easily control dimming and color adjustment with a simple configuration and that can perform dimming and color adjustment control with high precision and a wide variety of colors.

[0037] As shown in FIG. 9, the voltage-driven semiconductor switch or the current-driven semiconductor switch is driven by a continuous control signal Sco or an intermittent control signal Si.

[0038] As a result, when the voltage-driven semiconductor switch or the current-driven semiconductor switch is driven by the continuous control signal Sco, in addition to the above-mentioned effects, it becomes possible to easily control continuous dimming and color adjustment with fine variations. Also, when the voltage-driven semiconductor switch or the current-driven semiconductor switch is driven by the intermittent control signal Si, in addition to the above-mentioned effects, it becomes possible to suppress heat generation from the first light-emitting element and / or the second light-emitting element, thereby simplifying the heat dissipation design and extending the life of the system.

[0039] As shown in FIG. 10, the power supply device 100 includes a control circuit 1a, a choke coil 70, and a semiconductor switching element 80. The choke coil is electrically connected to the first light-emitting element 10b and the second light-emitting element 20g. The semiconductor switching element 80 is electrically connected to the first light-emitting element 10b and the second light-emitting element 20g, and is driven based on a constant current control signal Sc generated by a constant current control unit 30a.

[0040] This makes it possible to provide a power supply device that can easily control dimming and color adjustment with a simple configuration and that can perform dimming and color adjustment control with high precision and a wide variety of colors.

[0041] As shown in FIG. 11, control by the constant current control unit 30b and / or control by the current ratio control unit 40c is performed based on detection information from a sensor 90 that detects either the illuminance, temperature, humidity, human presence, or brain waves emitted by a human in the environment in which the first light-emitting element 10c and / or the second light-emitting element 20h are installed.

[0042] This makes it possible to provide a power supply device that, in addition to the above-mentioned effects, can sensitively respond to changes in the environment in which the first light-emitting element 10c and / or the second light-emitting element 20h are installed, and is capable of highly accurate dimming color control with a wide variety of colors. [Explanation of symbols]

[0043] 1 Control circuit 1a Control circuit 10 First light emitting element 10a First light emitting element 10b First light emitting element 10c First light-emitting element 20 Second light-emitting element 20a Second light emitting element 20b Second light-emitting element 20c Second light-emitting element 20d Second light-emitting element 20e Second light-emitting element 20f Second light-emitting element 20g Second light emitting element 20h Second light-emitting element 30 Constant current control section 30a Constant current control section 30b Constant current control section 40 Current ratio control unit 40a Current ratio control section 40b Current ratio control section 40c Current ratio control section 50 Impedance change section 50a Impedance change section 50b Impedance change section 50c Impedance control section 50d Impedance control section 60 Second voltage change unit 60a Second voltage change unit 60b Second voltage change unit 60c Second voltage change unit 60d Second voltage change unit 70 Choke coil 80 Semiconductor switching element 90 Sensors 100 Power supply V1 First voltage V2 Second voltage V2a Second voltage V2b Second voltage VC constant voltage characteristics RC constant resistance characteristics RC1 constant resistance characteristics RC2 constant resistance characteristics I1 1st current I2 2nd current IT total current VSW Voltage-driven semiconductor switch VSW1 Voltage-operated semiconductor switch ISW Current-driven semiconductor switch ISW1 Current-driven semiconductor switch Sc constant current control signal Sr Current ratio control signal Sco Continuous control signal Si Intermittent control signal

Claims

1. A control circuit for controlling dimming and color of a first light emitting element and a second light emitting element, A constant current control unit and a current ratio control unit are provided, the first light emitting element has a constant voltage characteristic, and a first current flows at a first voltage, the first current being controlled within a first current control range based on the constant voltage characteristic; the second light emitting element has a constant resistance characteristic that has a constant resistance in a voltage region higher than a second voltage, and a second current controlled within a second current control range based on the constant resistance characteristic flows through the second light emitting element; the constant current control unit controls a sum of the first current and the second current to be a constant current; The control circuit according to claim 1, wherein the current ratio control unit controls the constant resistance characteristic to thereby control the current ratio between the first current and the second current.

2. 2 . The control circuit according to claim 1 , wherein the constant resistance characteristic is controlled by changing an impedance of an impedance changing section connected to the second light emitting element based on control of the current ratio by the current ratio control section.

3. The control circuit according to claim 2 , wherein the impedance changing unit is connected in series to the second light emitting element.

4. 2. The control circuit according to claim 1, wherein the second voltage is controlled by a second voltage change of a second voltage change unit connected to the second light-emitting element based on control of the current ratio by the current ratio control unit.

5. The control circuit according to claim 4 , wherein the second voltage changer is connected in parallel to at least a portion of the second light emitting element.

6. the constant resistance characteristic is controlled by changing the impedance of an impedance change unit connected to the second light emitting element based on control of the current ratio by the current ratio control unit, 2. The control circuit according to claim 1, wherein the second voltage is controlled by a second voltage change performed by a second voltage change unit connected to the second light-emitting element based on control of the current ratio by the current ratio control unit.

7. The first light emitting element and / or the second light emitting element include a plurality of elements each having a different light emission color, The impedance control unit is connected in series to the second light emitting element, The control circuit according to claim 6 , wherein the second voltage changer is connected in parallel to at least a part of the second light emitting element.

8. 8. The control circuit according to claim 7, wherein the impedance changing unit and / or the second voltage changing unit is configured using a voltage-driven semiconductor switch or a current-driven semiconductor switch.

9. 9. The control circuit according to claim 8, wherein the voltage-driven semiconductor switch or the current-driven semiconductor switch is driven by a continuous control signal or an intermittent control signal.

10. A power supply comprising the control circuit according to claim 1, a choke coil, and a semiconductor switching element, the choke coil is electrically connected to the first light emitting element and the second light emitting element; The power supply device, wherein the semiconductor switching element is electrically connected to the first light emitting element and the second light emitting element, and is driven based on a constant current control signal generated by the constant current control unit.

11. The power supply device described in claim 10, characterized in that the control by the constant current control unit and / or the control by the current ratio control unit is performed based on detection information from a sensor that detects either the illuminance, temperature, humidity, human presence, or brain waves emitted by the human in the environment in which the first light-emitting element and / or the second light-emitting element are installed.

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