Energy-saving system with thermoelectric conversion reflow

Abstract

The present invention discloses an energy-saving system capable of thermoelectric conversion and reflux, comprising an electrically connected driving power supply, a load, a thermoelectric converter and an energy-saving controller. The system drives the light source for illumination by controlling the energy-saving controller through the conversion current of the driving power supply current and the light source illumination, so that the sum of the total current does not exceed the rated current of the light source, and the waste heat can be recovered, so that the light-emitting diode load is in a working state within the rated current range of the light source, thereby extending the life of the light-emitting diode, saving energy and improving the energy utilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of lighting control, and in particular to an energy-saving system capable of thermoelectric conversion reflux. Background Art

[0002] In order to improve the luminous efficiency and extend the life, high-power light-emitting diodes have gradually replaced incandescent lamps and fluorescent lamps. One of the main advantages of light-emitting diodes is its high efficiency. Traditional incandescent lamps and fluorescent lamps have nearly 80% of electrical energy converted into heat energy and lost, while light-emitting diodes have only 20% or less heat energy loss. Semiconductor light-emitting diodes also generate heat during operation, and the amount depends on the overall luminous efficiency. Under the action of external electrical energy, the radiation recombination of electrons and holes produces electroluminescence, and the light radiated near the PN junction needs to pass through the semiconductor medium and packaging medium of the chip itself to reach the outside (air). Comprehensive current injection efficiency, radiation luminescence quantum efficiency, chip external light extraction efficiency, etc., in the end, only about 30-40% of the input electrical energy is converted into light energy, and the remaining 60%-70% of the energy is mainly converted into heat energy in the form of lattice vibrations caused by non-radiative recombination. However, most of the heat generated by incandescent lamps and fluorescent lamps is transmitted to the outside of the bulb in the form of radiation, while the small amount of heat generated by light-emitting diodes cannot be transmitted to the outside, so the temperature of the light-emitting diode lighting system will gradually increase, seriously affecting its luminous efficiency and service life. Therefore, effective heat management of the LED lighting system is required to ensure its normal use and increase its service life.

[0003] At present, the LED lamps on the market mainly rely on natural heat dissipation. From the perspective of heat transfer, natural heat dissipation uses natural convection and thermal radiation as the basic heat dissipation principle. In natural heat dissipation, the basic idea is to use the outer wall of the lamp, especially the fins, to dissipate the surrounding air through convection and radiation to the surrounding objects. This form of heat dissipation relies on the structure of the lamp itself (such as adding a heat sink) to achieve heat dissipation. The way to improve the heat dissipation effect is mainly to increase the heat dissipation area and ventilation convection effect and improve the surface radiation coefficient through optimized design, which brings about the problem of increasing size and cost. According to a survey, a 100W LED lamp requires at least 350 yuan in heat dissipation costs. Moreover, this method has very high requirements on the structure of the lamp, and the appearance is bulky, which affects the appearance and taste. When the heating power increases, the heat dissipation cost increases sharply and the heat dissipation is limited. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes an energy-saving system capable of thermoelectric conversion reflux, which can recycle waste heat and keep the LED load in an operating state within the rated current range of the light source, thereby extending the life of the LED, saving energy and improving energy utilization.

[0005] To achieve the above object, the present invention adopts the following technical solution: an energy-saving system for cocoa thermoelectric conversion reflux, the energy-saving system comprising a driving power supply, a load, and:

[0006] A thermoelectric converter, used to convert the thermal energy of the load into electrical energy;

[0007] The energy-saving controller is used for receiving the input current of the driving power supply and the thermoelectric converter, and controlling the driving power supply and the load according to the input current.

[0008] Preferably, the driving power supply comprises a first constant current driving circuit and a sampling circuit, and the first constant current driving circuit and the sampling circuit are electrically connected to each other.

[0009] Preferably, the first constant current drive circuit comprises a first transistor (Q1), the drain of the first transistor (Q1) is electrically connected to an input power supply through an input end of a transformer, the source is grounded through a built-in variable load of the energy-saving controller, and the gate is switched by the energy-saving controller.

[0010] Preferably, the sampling circuit comprises a first resistor (R1) and a second resistor (R2) connected in series, one end of the first resistor (R1) is electrically connected to the source of the first transistor (Q1) of the first constant current drive circuit, the other end of the first resistor (R1) is electrically connected to one end of the second resistor (R2), and the other end of the second resistor (R2) is grounded.

[0011] Preferably, the energy-saving controller comprises an adder, a comparison amplifier and a second driving constant current circuit, and the adder, the comparison amplifier and the second driving constant current circuit are electrically connected in sequence.

[0012] Preferably, the first input terminal of the adder is electrically connected between the first resistor (R1) and the second resistor (R2) of the driving power sampling circuit, and the second input terminal of the adder is electrically connected to the output terminal of the thermoelectric converter.

[0013] Preferably, the comparison amplifier comprises a first operational amplifier (A1), a positive input terminal of the first operational amplifier (A1) is connected to a reference voltage, a negative input terminal of the first operational amplifier (A1) is connected to an output terminal of the adder, and the first operational amplifier (A1) amplifies the comparison signal and outputs it to the second driving constant current circuit.

[0014] Preferably, the second driving constant current circuit comprises a second operational amplifier (A2), a second transistor (Q2) and a third resistor (R3), the positive input terminal of the second operational amplifier (A2) is connected to the output terminal of the comparison amplifier, the output terminal of the second operational amplifier (A2) is connected to the gate of the second transistor (Q2), the drain of the second transistor (Q2) drives the load through the output terminal of the transformer, the second transistor (Q2) is connected to the negative input terminal of the second operational amplifier (A2), and is grounded through the third resistor (R3).

[0015] Preferably, the transistor is one or more of a field effect transistor and a bipolar transistor, wherein the first transistor (Q1) and the second transistor (Q2) are both NMOS transistors.

[0016] Preferably, the load is a light emitting diode, and the light emitting diode includes a single light emitting diode or a light emitting diode string.

[0017] Beneficial effects of the present invention: The energy-saving system capable of thermoelectric conversion and reflux of the present invention is converted into a constant primary current after entering the driving power supply through the power supply, and the current is then controlled by the energy-saving controller to drive the light source for illumination. Heat is generated during the illumination process of the light source, so the thermoelectric converter converts part of the heat into a compensation current, and the secondary current is provided to the light source for illumination after passing through the energy-saving controller. Since the total current sum of the primary current and the compensation current is greater than the rated current of the light source at this time, it will affect the life of the light source. At this time, the feedback circuit starts to work, and when it detects that the total current is too large, it will feed back the information to the driving power supply. After receiving the feedback information, the driving power supply generates a secondary current, and the secondary current is less than the primary current. Finally, the sum of the total current of the secondary current and the compensation current jointly powers the light source, and the sum of the total current of the secondary current and the compensation current does not exceed the rated current of the light source. More specifically, the I / O port of the energy-saving controller collects energy from the source of the first constant current driving circuit of the driving power supply through a sampling circuit composed of a voltage divider, and adds the energy collected by the driving power supply to the energy obtained by the thermoelectric converter through an adder, and realizes constant current control of the second transistor (Q2) by comparing and amplifying with the reference voltage; at the same time, the I / O port of the energy-saving controller also compares the sum of the energy of the adder with the preset threshold of the energy-saving controller, and adjusts the built-in variable load of the energy-saving controller and the disconnection of the first transistor (Q1) according to the comparison result, thereby realizing current control and disconnection of the driving power supply. These two main measures realize the adjustment of the power supply size of the driving power supply according to the size of the energy generated by the load through the thermoelectric converter, and can recycle waste heat, so that the light-emitting diode load is in a working state within the rated current range of the light source, prolonging the life of the light-emitting diode, saving energy and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and the embodiments in the drawings do not constitute any limitation to the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a system structure diagram of an embodiment of an energy-saving system capable of thermoelectric conversion and reflux according to the present invention.

[0020] Figure 2 It is a specific circuit diagram of an embodiment of an energy-saving system capable of thermoelectric conversion and reflux according to the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Thermoelectric conversion refers to the mutual conversion between thermal energy and electrical energy. Thermoelectric effects include Seebeck effect, Peltier effect, and Thomson effect. The discovery of the thermoelectric conversion effect has aroused great interest in the scientific community because, from a macroscopic point of view, the thermoelectric conversion effect means the direct conversion between thermal energy and electrical energy. How to make this effect a practical energy conversion and utilization. The thermal conduction generator, also known as the Seebeck generator, is a device that uses the thermoelectric effect to directly convert heat into electrical energy. The old device based on the Seebeck effect uses a bimetallic junction and is very bulky.

[0028] The embodiment of the present invention provides an energy-saving system for cocoa thermoelectric conversion reflux, such as Figure 1 As shown, the energy-saving system includes a driving power supply, a load, a thermoelectric converter and an energy-saving controller, wherein the thermoelectric converter is used to convert the thermal energy of the load into electrical energy, and the energy-saving controller is used to receive the input current of the driving power supply and the thermoelectric converter, and control the driving power supply and the load according to the input current. The load may be a light-emitting diode, and the light-emitting diode may include a single light-emitting diode or a light-emitting diode string.

[0029] In this embodiment, the driving power supply includes a first constant current driving circuit and a sampling circuit, and the first constant current driving circuit and the sampling circuit are electrically connected to each other. Specifically, the first constant current driving circuit includes a first transistor (Q1), the drain of the first transistor (Q1) is electrically connected to the input power supply through the input end of a mutual inductor, the source is grounded through the built-in variable load of the energy-saving controller, and the gate is switched by the energy-saving controller; the sampling circuit includes a first resistor (R1) and a second resistor (R2) connected in series, one end of the first resistor (R1) is electrically connected to the source of the first transistor (Q1) of the first constant current driving circuit, the other end of the first resistor (R1) is electrically connected to one end of the second resistor (R2), and the other end of the second resistor (R2) is grounded.

[0030] Among them, the function of the transformer is to convert the input voltage and current into output voltage and current according to a preset ratio to provide energy to the load.

[0031] like Figure 2As shown, in this embodiment, the energy-saving controller includes an adder, a comparison amplifier and a second driving constant current circuit, and the adder, the comparison amplifier and the second driving constant current circuit are electrically connected in sequence. Specifically, the first input end of the adder is electrically connected between the first resistor (R1) and the second resistor (R2) of the driving power sampling circuit, and the second input end of the adder is electrically connected to the output end of the thermoelectric converter; the comparison amplifier includes a first operational amplifier (A1), the positive input end of the first operational amplifier (A1) is connected to a reference voltage, the negative input end of the first operational amplifier (A1) is connected to the output end of the adder, and the first operational amplifier (A1) amplifies the comparison signal and outputs it to the second driving constant current circuit; the second driving constant current circuit includes a second operational amplifier (A2), a second transistor (Q2) and a third resistor (R3), the positive input end of the second operational amplifier (A2) is connected to the output end of the comparison amplifier, the output end of the second operational amplifier (A2) is connected to the gate of the second transistor (Q2), the drain of the second transistor (Q2) drives the load through the output end of the mutual inductor, and the second transistor (Q2) is connected to the negative input end of the second operational amplifier (A2) and is grounded through the third resistor (R3).

[0032] The I / O port of the energy-saving controller collects energy from the source of the first constant current driving circuit of the driving power supply through a sampling circuit composed of a voltage divider, and adds the energy collected by the driving power supply to the energy obtained by the thermoelectric converter through an adder, and realizes constant current control of the second transistor (Q2) by comparing and amplifying with the reference voltage; at the same time, the I / O port of the energy-saving controller also compares the sum of the energy of the adder with the preset threshold of the energy-saving controller, and adjusts the built-in variable load of the energy-saving controller and the disconnection of the first transistor (Q1) according to the comparison result, so as to realize the current control and disconnection of the driving power supply. These two main measures realize the adjustment of the power supply size of the driving power supply according to the size of the energy generated by the load through the thermoelectric converter, so as to ultimately ensure that the light-emitting diode load is in a constant current and constant voltage working state.

[0033] It should be noted that the transistor in this embodiment may be one or more of a field effect transistor and a bipolar transistor. Preferably, the first transistor (Q1) and the second transistor (Q2) in this embodiment are both NMOS transistors. However, it should be noted that the transistor in this embodiment may also be a structure in which the gate and source of a depletion-type N-channel MOS transistor are connected. Although not shown in the figure, it may also be a structure in which the gate and source of a depletion-type P-channel MOS transistor are connected.

[0034] The working principle and effect of the energy-saving system with thermoelectric conversion and reflow of the present invention are as follows: the energy-saving system with thermoelectric conversion and reflow is converted into a constant primary current after entering the driving power supply through the power supply, and the current is then controlled by the energy-saving controller to drive the light source for illumination. Heat is generated during the illumination process of the light source, so the thermoelectric converter converts part of the heat into a compensation current, and the secondary current is provided to the light source for illumination after passing through the energy-saving controller. Since the total current sum of the primary current and the compensation current is greater than the rated current of the light source at this time, it will affect the life of the light source. At this time, the feedback circuit starts to work, and when it detects that the total current is too large, it will feed back the information to the driving power supply. After receiving the feedback information, the driving power supply generates a secondary current, and the secondary current is less than the primary current. Finally, the sum of the total current of the secondary current and the compensation current jointly powers the light source, and the sum of the total current of the secondary current and the compensation current does not exceed the rated current of the light source. More specifically, the I / O port of the energy-saving controller collects energy from the source of the first constant current driving circuit of the driving power supply through a sampling circuit composed of a voltage divider, and adds the energy collected by the driving power supply to the energy obtained by the thermoelectric converter through an adder, and realizes constant current control of the second transistor (Q2) by comparing and amplifying with the reference voltage; at the same time, the I / O port of the energy-saving controller also compares the sum of the energy of the adder with the preset threshold of the energy-saving controller, and adjusts the built-in variable load of the energy-saving controller and the disconnection of the first transistor (Q1) according to the comparison result, thereby realizing current control and disconnection of the driving power supply. These two main measures realize the adjustment of the power supply size of the driving power supply according to the size of the energy generated by the load through the thermoelectric converter, and can recycle waste heat, so that the light-emitting diode load is in a working state within the rated current range of the light source, prolonging the life of the light-emitting diode, saving energy and improving energy utilization.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] It should also be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving system capable of thermoelectric conversion reflux, characterized in that: The energy-saving system includes a driving power supply, a load, and: a thermoelectric converter for converting the thermal energy of the load into electrical energy; an energy-saving controller for receiving input currents of the driving power supply and the thermoelectric converter, and controlling the driving power supply and the load according to the input current; The driving power supply comprises a first constant current driving circuit and a sampling circuit, wherein the first constant current driving circuit and the sampling circuit are electrically connected to each other; The first constant current driving circuit comprises a first transistor (Q1), the drain of the first transistor (Q1) is electrically connected to an input power supply through an input end of a transformer, the source is grounded through a built-in variable load of the energy-saving controller, and the gate is switched on and off by the energy-saving controller; The energy-saving controller includes an adder, a comparison amplifier and a second driving constant current circuit, wherein the adder, the comparison amplifier and the second driving constant current circuit are electrically connected in sequence, the first input end of the adder is electrically connected to the driving power sampling circuit, and the second input end of the adder is electrically connected to the output end of the thermoelectric converter; The second driving constant current circuit comprises a second operational amplifier (A2), a second transistor (Q2) and a third resistor (R3), wherein the positive input terminal of the second operational amplifier (A2) is connected to the output terminal of the comparison amplifier, the output terminal of the second operational amplifier (A2) is connected to the gate of the second transistor (Q2), the drain of the second transistor (Q2) drives the load through the output terminal of the transformer, and the source of the second transistor (Q2) is connected to the negative input terminal of the second operational amplifier (A2) and is grounded through the third resistor (R3).

2. The energy-saving system according to claim 1, characterized in that: The sampling circuit comprises a first resistor (R1) and a second resistor (R2) connected in series, one end of the first resistor (R1) is electrically connected to the source of a first transistor (Q1) of the first constant current drive circuit, the other end of the first resistor (R1) is electrically connected to one end of the second resistor (R2), and the other end of the second resistor (R2) is grounded.

3. The energy-saving system according to claim 1, characterized in that: The first input terminal of the adder is electrically connected between a first resistor (R1) and a second resistor (R2) of the driving power sampling circuit.

4. The energy-saving system according to claim 1, characterized in that: The comparison amplifier comprises a first operational amplifier (A1), a positive input terminal of the first operational amplifier (A1) is connected to a reference voltage, a negative input terminal of the first operational amplifier (A1) is connected to the output terminal of the adder, and the first operational amplifier (A1) amplifies the comparison signal and outputs it to the second driving constant current circuit.

5. The energy-saving system according to claim 1, characterized in that: The transistors are field effect transistors, bipolar transistors or one or more thereof, wherein the first transistor (Q1) and the second transistor (Q2) are both NMOS transistors.

6. The energy-saving system according to claim 1, characterized in that: The load is a light emitting diode, and the light emitting diode includes a single light emitting diode or a light emitting diode string.

Images