Illumination driving circuit and illumination equipment

Abstract

The utility model discloses a lighting driving circuit and lighting equipment. The lighting driving circuit comprises a power supply module, a power supply switch, a voltage detection module and a current limiting module. The voltage detection module is used for detecting power supply voltage and controlling on and off of the power switch based on the power supply voltage. The current limiting module is connected with the power switch and the light-emitting module, and the current limiting module is used for adjusting the driving current flowing through the light-emitting module based on the power voltage. Whether the power switch can be turned on to drive the light emitting module or not can be judged through the voltage detection module according to the power voltage, the current limiting module can control the magnitude of the driving current according to the small change of the power voltage, the electric energy release rate of the power module is controlled, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The present application belongs to the field of LED lighting technology, and in particular, relates to a lighting drive circuit and a lighting device. Background Art

[0002] Solar lighting usually charges the battery through solar panels during the day, and the battery drives the LED light through the control board at night until the battery is fully discharged. Since the voltage drop is very small when the battery is fully charged, the brightness drop is also very small. When the battery is almost fully discharged, the voltage will change significantly, and the brightness of the LED light will drop visibly. Since the battery is almost fully discharged at this time, the duration of the LED light dimming is very short, and the brightness change is basically invisible most of the time. In actual applications, people usually have more outdoor activities before 12 o'clock in the evening, and there are basically very few outdoor pedestrians after midnight. Outdoor lamps that work with almost constant brightness are not humane and are also a waste of energy. Utility Model Content

[0003] The purpose of the present application is to provide a lighting drive circuit and a lighting device, aiming to solve the problem of unreasonable battery power distribution in traditional solar lighting lamps.

[0004] The first aspect of an embodiment of the present application provides a lighting drive circuit, comprising: a power supply module, the power supply module is used to provide a power supply voltage; a power switch, the first end of the power switch is connected to the power supply module, and the second end of the power switch is used to connect to a light-emitting module; a voltage detection module, the voltage detection module is used to detect the power supply voltage and control the on and off of the power switch based on the power supply voltage; a current limiting module, the current limiting module is respectively connected to the power switch and the light-emitting module, and the current limiting module is used to adjust the driving current flowing through the light-emitting module based on the power supply voltage.

[0005] In one embodiment, the power module includes a solar panel, an energy storage battery and a first diode; the positive electrode of the solar panel is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the positive electrode of the energy storage battery, the positive electrode of the energy storage battery is connected to the power switch, the negative electrode of the solar panel is connected to the positive electrode of the energy storage battery, the solar panel is used to provide a charging voltage to the energy storage battery, and the energy storage battery is used to provide the power supply voltage.

[0006] In one embodiment, the voltage detection module is used to control the power switch to be turned on when the charging voltage is less than a first preset threshold and the power supply voltage is greater than a second preset threshold.

[0007] In one embodiment, the power switch includes a P-type MOS tube, the source of the P-type MOS tube is connected to the power module, the drain of the P-type MOS tube is used to connect to the light-emitting module, and the gate of the P-type MOS tube is connected to the voltage detection module.

[0008] In one embodiment, the power module further includes a first voltage-dividing resistor and a second voltage-dividing resistor, and the voltage detection module includes a first triode, a second triode, a third voltage-dividing resistor and a fourth voltage-dividing resistor; a first end of the first voltage-dividing resistor is connected to the positive electrode of the solar cell panel, and a second end of the first voltage-dividing resistor is respectively connected to the first end of the second voltage-dividing resistor and the base of the first triode; a first end of the third voltage-dividing resistor is connected to the positive electrode of the energy storage battery, a second end of the third voltage-dividing resistor is respectively connected to the collector of the first triode and the base of the second triode, an emitter of the first triode is connected to the negative electrode of the energy storage battery, a first end of the fourth voltage-dividing resistor is connected to the positive electrode of the energy storage battery, a second end of the fourth voltage-dividing resistor is respectively connected to the collector of the second triode and the gate of the P-type MOS tube, and an emitter of the second triode is connected to the negative electrode of the energy storage battery.

[0009] In one embodiment, the current limiting module includes a second diode, an operational amplifier, a fifth voltage-dividing resistor, a sixth voltage-dividing resistor, a seventh voltage-dividing resistor, a first amplifying resistor, a second amplifying resistor, a voltage-stabilizing capacitor and a third transistor; the cathode of the second diode is connected to the second end of the power switch, the anode of the second diode is respectively connected to the first end of the fifth voltage-dividing resistor and the positive input end of the operational amplifier, and the second end of the fifth voltage-dividing resistor is connected to the negative electrode of the power module; the power end of the operational amplifier is connected to the second end of the power switch, the first end of the voltage-stabilizing capacitor is connected to the second end of the power switch, and the second end of the voltage-stabilizing capacitor is grounded; The first end of the sixth voltage-dividing resistor is used to be connected to the output end of the light-emitting module, the second end of the sixth voltage-dividing resistor is connected to the collector of the third transistor, the emitter of the third transistor is connected to the negative electrode of the power module, the base of the third transistor is connected to the first end of the seventh voltage-dividing resistor, and the second end of the seventh voltage-dividing resistor is connected to the output end of the operational amplifier; the first end of the first amplifying resistor is connected to the second end of the seventh voltage-dividing resistor, the second end of the first amplifying resistor is respectively connected to the reverse input end of the operational amplifier and the first end of the second amplifying resistor, and the second end of the second amplifying resistor is connected to the negative electrode of the power module.

[0010] In one embodiment, the second diode is a zener diode.

[0011] In one embodiment, a resistance ratio of the first amplifying resistor to the second amplifying resistor is 9:1.

[0012] A second aspect of an embodiment of the present application provides a lighting device, including a light-emitting module and a lighting driving circuit as described above, wherein the lighting driving circuit is connected to the light-emitting module to drive the light-emitting module to operate.

[0013] In one embodiment, the light emitting module includes an LED light group.

[0014] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the voltage detection module can determine whether the power switch can be turned on to drive the light-emitting module based on the power supply voltage, and the current limiting module can control the size of the driving current based on slight changes in the power supply voltage, thereby controlling the rate at which the power supply module releases electrical energy, thereby achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the principle of a lighting driving circuit provided in an embodiment of the present application;

[0016] Figure 2 A circuit diagram of a lighting driving circuit provided in an embodiment of the present application;

[0017] Figure 3 A schematic diagram of the principles of a lighting device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0020] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] Figure 1 The schematic diagram of the structure of the lighting driving circuit provided by an embodiment of the present application is shown. For the convenience of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0023] The lighting driving circuit 10 includes: a power module 100 , a power switch 200 , a voltage detection module 300 and a current limiting module 400 .

[0024] The power module 100 is used to provide a power supply voltage. The first end of the power switch 200 is connected to the power module 100, and the second end of the power switch 200 is used to connect to the light emitting module 20. The voltage detection module 300 is used to detect the power supply voltage and control the on and off of the power switch 200 based on the power supply voltage. The current limiting module 400 is respectively connected to the power switch 200 and the light emitting module 20, and the current limiting module 400 is used to adjust the driving current flowing through the light emitting module 20 based on the power supply voltage.

[0025] It should be noted that this embodiment does not require an additional brightness sensor. The voltage detection module 300 can determine whether the power switch 200 can be turned on to drive the light-emitting module 20 based on the power supply voltage. The current limiting module 400 can control the size of the driving current based on slight changes in the power supply voltage, and further control the rate at which the power module 100 releases electrical energy, thereby achieving energy-saving effects.

[0026] In one embodiment, if Figure 2 As shown, the power module 100 includes a solar panel 110, an energy storage battery 120 and a first diode D1. The positive electrode of the solar panel 110 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the positive electrode of the energy storage battery 120, the positive electrode of the energy storage battery 120 is connected to the power switch 200, the negative electrode of the solar panel 110 is connected to the positive electrode of the energy storage battery 120, the solar panel 110 is used to provide a charging voltage to the energy storage battery 120, and the energy storage battery 120 is used to provide a power supply voltage.

[0027] When there is sufficient light, the solar panel 110 can generate a corresponding charging voltage according to the light intensity. The stronger the light intensity, the higher the charging voltage, and the charging voltage can charge the energy storage battery 120.

[0028] In one embodiment, the voltage detection module 300 is used to control the power switch 200 to be turned on when the charging voltage is less than a first preset threshold and the power voltage is greater than a second preset threshold.

[0029] It is understandable that when the charging voltage is greater than the first preset threshold or the power supply voltage is less than the second preset threshold, the power switch 200 is turned off. When the charging voltage is less than the first preset threshold, it means that the charging voltage of the solar panel 110 is reduced due to insufficient light intensity received, and the light emitting module 20 needs to emit light to achieve the effect of automatically starting the light emitting module 20 according to the light intensity of the environment.

[0030] The first preset threshold and the second preset threshold can be set according to actual conditions.

[0031] In one embodiment, if Figure 2 As shown, the power switch 200 includes a P-type MOS tube Q1 , the source of the P-type MOS tube Q1 is connected to the power module 100 , the drain of the P-type MOS tube Q1 is used to connect to the light emitting module 20 , and the gate of the P-type MOS tube Q1 is connected to the voltage detection module 300 .

[0032] It can be understood that when the voltage detection module 300 provides a high level to the P-type MOS transistor Q1, the P-type MOS transistor Q1 is turned on, and when the voltage detection module 300 provides a low level to the P-type MOS transistor Q1, the P-type MOS transistor Q1 is turned off.

[0033] In one embodiment, if Figure 2 As shown, the power module 100 further includes a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2, and the voltage detection module 300 includes a first transistor Q2, a second transistor Q3, a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4. The first end of the first voltage-dividing resistor R1 is connected to the positive electrode of the solar cell panel 110, and the second end of the first voltage-dividing resistor R1 is respectively connected to the first end of the second voltage-dividing resistor R2 and the base of the first transistor Q2. The first end of the third voltage-dividing resistor R3 is connected to the positive electrode of the energy storage battery 120, the second end of the third voltage-dividing resistor R3 is respectively connected to the collector of the first transistor Q2 and the base of the second transistor Q3, the emitter of the first transistor Q2 is connected to the negative electrode of the energy storage battery 120, the first end of the fourth voltage-dividing resistor R4 is connected to the positive electrode of the energy storage battery 120, the second end of the fourth voltage-dividing resistor R4 is respectively connected to the collector of the second transistor Q3 and the gate of the P-type MOS transistor Q1, and the emitter of the second transistor Q3 is connected to the negative electrode of the energy storage battery 120. The first transistor Q2 and the second transistor Q3 are specifically NPN transistors.

[0034] It is understandable that during the day, the solar panel 110 can charge the energy storage battery 120 through the first diode D1. At the same time, the charging voltage is divided by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, so that the first transistor Q2 is turned on, the second transistor Q3 is turned off, and the P-type MOS transistor Q1 is also turned off. The current limiting module 400 and the light-emitting module 20 behind the P-type MOS transistor Q1 cannot obtain electrical energy, and the light-emitting module 20 is not lit, achieving the effect of not lighting during the day. As the light intensity of the environment decreases, when the charging voltage is less than the first preset threshold, the first transistor Q2 is turned off, the second transistor Q3 is turned on, and the P-type MOS transistor Q1 is also turned on, which can provide a power supply voltage to the light-emitting module 20.

[0035] In one embodiment, if Figure 2 As shown, the current limiting module 400 includes a second diode D2, an operational amplifier U1, a fifth voltage-dividing resistor R5, a sixth voltage-dividing resistor R6, a seventh voltage-dividing resistor R7, a first amplifying resistor Rf, a second amplifying resistor Ri, a voltage-stabilizing capacitor C1 and a third triode Q4. The cathode of the second diode D2 is connected to the second end of the power switch 200, the anode of the second diode D2 is respectively connected to the first end of the fifth voltage-dividing resistor R5 and the positive input end of the operational amplifier U1, and the second end of the fifth voltage-dividing resistor R5 is connected to the cathode of the power module 100. The power supply end of the operational amplifier U1 is connected to the second end of the power switch 200, the first end of the voltage-stabilizing capacitor C1 is connected to the second end of the power switch 200, and the second end of the voltage-stabilizing capacitor C1 is grounded. The first end of the sixth voltage-dividing resistor R6 is used to be connected to the output end of the light-emitting module 20, the second end of the sixth voltage-dividing resistor R6 is connected to the collector of the third triode Q4, the emitter of the third triode Q4 is connected to the negative electrode of the power module 100, the base of the third triode Q4 is connected to the first end of the seventh voltage-dividing resistor R7, and the second end of the seventh voltage-dividing resistor R7 is connected to the output end of the operational amplifier U1. The first end of the first amplifying resistor Rf is connected to the second end of the seventh voltage-dividing resistor R7, the second end of the first amplifying resistor Rf is respectively connected to the reverse input end of the operational amplifier U1 and the first end of the second amplifying resistor Ri, and the second end of the second amplifying resistor Ri is connected to the negative electrode of the power module 100. Among them, the second diode D2 is specifically a voltage-stabilizing diode. Among them, the third triode Q4 is specifically an NPN triode.

[0036] It is understandable that the driving current of the light emitting module 20 can be controlled by controlling the current flowing through the third transistor Q4. The greater the current flowing through the third transistor Q4, the greater the driving current of the light emitting module 20. The driving current is positively correlated with the brightness of the light emitting module 20. In some embodiments, the power supply voltage is positively correlated with the driving current.

[0037] It should be noted that the power supply voltage is added to the positive input terminal of the operational amplifier U1 after being stepped down by the second diode D2. Assuming that the voltage drop applied to the second diode D2 is Vz=3V, and the power supply voltage fluctuates between 3.2V and 3.3V, the voltage added to the positive input terminal of the operational amplifier U1 has a minimum value of 0.2V and a maximum value of 0.3V, that is, the voltage at the positive input terminal of the operational amplifier U1 fluctuates between 0.2V and 0.3V. By setting the resistance values ​​of the first amplification resistor Rf and the second amplification resistor Ri, a fixed discharge multiple can be obtained.

[0038] In one embodiment, the resistance ratio of the first amplifying resistor Rf to the second amplifying resistor Ri is 9:1.

[0039] Specifically, in some embodiments, the resistance of the first amplifying resistor Rf is 9KΩ, and the resistance of the second amplifying resistor Ri is 1KΩ, that is, the discharge multiple is 1+9 / 1=10, and the output voltage of the operational amplifier U1 is 2V~3V. The voltage output by the operational amplifier U1 can allow the third transistor Q4 to produce a driving current with a large change, thereby achieving a small change based on the power supply voltage. When the power supply voltage becomes smaller, the brightness of the light-emitting module 20 is controlled to change slowly, thereby achieving the purpose of energy saving.

[0040] Figure 3 The schematic diagram of the principle of the lighting device provided by an embodiment of the present application is shown. For the convenience of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0041] The lighting device 30 includes a light emitting module 20 and a lighting driving circuit 10 as in any one of the above embodiments. The lighting driving circuit 10 is connected to the light emitting module 20 to drive the light emitting module 20 to operate.

[0042] The lighting device 30 can be used as a lawn lamp and applied for outdoor lighting.

[0043] In one embodiment, the light emitting module 20 includes an LED light group.

[0044] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0045] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0046] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A lighting driving circuit, characterized in that: include: A power supply module, wherein the power supply module is used to provide a power supply voltage; A power switch, wherein a first end of the power switch is connected to the power module, and a second end of the power switch is used to connect to the light emitting module; A voltage detection module, the voltage detection module is used to detect the power supply voltage and control the on and off of the power switch based on the power supply voltage; A current limiting module is connected to the power switch and the light emitting module respectively, and is used to adjust the driving current flowing through the light emitting module based on the power supply voltage.

2. The lighting driving circuit according to claim 1, characterized in that: The power module includes a solar panel, an energy storage battery and a first diode; The positive electrode of the solar cell panel is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the positive electrode of the energy storage battery, the positive electrode of the energy storage battery is connected to the power switch, the negative electrode of the solar cell panel is connected to the positive electrode of the energy storage battery, the solar cell panel is used to provide a charging voltage to the energy storage battery, and the energy storage battery is used to provide the power supply voltage.

3. The lighting driving circuit according to claim 2, characterized in that: The voltage detection module is used to control the power switch to be turned on when the charging voltage is less than a first preset threshold and the power supply voltage is greater than a second preset threshold.

4. The lighting driving circuit according to claim 3, characterized in that: The power switch comprises a P-type MOS tube, a source of the P-type MOS tube is connected to the power module, a drain of the P-type MOS tube is used to be connected to the light emitting module, and a gate of the P-type MOS tube is connected to the voltage detection module.

5. The lighting driving circuit according to claim 4, characterized in that: The power supply module further includes a first voltage-dividing resistor and a second voltage-dividing resistor, and the voltage detection module includes a first triode, a second triode, a third voltage-dividing resistor and a fourth voltage-dividing resistor; The first end of the first voltage-dividing resistor is connected to the positive electrode of the solar cell panel, and the second end of the first voltage-dividing resistor is connected to the first end of the second voltage-dividing resistor and the base of the first transistor respectively; The first end of the third voltage-dividing resistor is connected to the positive electrode of the energy storage battery, the second end of the third voltage-dividing resistor is respectively connected to the collector of the first transistor and the base of the second transistor, the emitter of the first transistor is connected to the negative electrode of the energy storage battery, the first end of the fourth voltage-dividing resistor is connected to the positive electrode of the energy storage battery, the second end of the fourth voltage-dividing resistor is respectively connected to the collector of the second transistor and the gate of the P-type MOS tube, and the emitter of the second transistor is connected to the negative electrode of the energy storage battery.

6. The lighting driving circuit according to any one of claims 1 to 5, characterized in that: The current limiting module includes a second diode, an operational amplifier, a fifth voltage-dividing resistor, a sixth voltage-dividing resistor, a seventh voltage-dividing resistor, a first amplifying resistor, a second amplifying resistor, a voltage-stabilizing capacitor and a third transistor; The cathode of the second diode is connected to the second end of the power switch, the anode of the second diode is connected to the first end of the fifth voltage-dividing resistor and the positive input end of the operational amplifier respectively, and the second end of the fifth voltage-dividing resistor is connected to the cathode of the power module; The power supply terminal of the operational amplifier is connected to the second terminal of the power switch, the first terminal of the voltage stabilizing capacitor is connected to the second terminal of the power switch, and the second terminal of the voltage stabilizing capacitor is grounded; The first end of the sixth voltage-dividing resistor is used to be connected to the output end of the light-emitting module, the second end of the sixth voltage-dividing resistor is connected to the collector of the third triode, the emitter of the third triode is connected to the negative electrode of the power module, the base of the third triode is connected to the first end of the seventh voltage-dividing resistor, and the second end of the seventh voltage-dividing resistor is connected to the output end of the operational amplifier; The first end of the first amplifying resistor is connected to the second end of the seventh voltage-dividing resistor, the second end of the first amplifying resistor is respectively connected to the inverting input end of the operational amplifier and the first end of the second amplifying resistor, and the second end of the second amplifying resistor is connected to the negative pole of the power module.

7. The lighting driving circuit according to claim 6, characterized in that: The second diode is a voltage regulator diode.

8. The lighting driving circuit according to claim 6, characterized in that: The resistance ratio of the first amplifying resistor to the second amplifying resistor is 9:

1.

9. A lighting device, characterized in that: It comprises a light emitting module and a lighting driving circuit as claimed in any one of claims 1 to 8, wherein the lighting driving circuit is connected to the light emitting module to drive the light emitting module to operate.

10. The lighting device according to claim 9, characterized in that The light emitting module comprises an LED lamp group.

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