Constant-voltage power supply dimming circuit

Abstract

The utility model discloses a constant voltage power supply dimming circuit, which comprises a silicon controlled rectifier dimming module, a 0-10V dimming module and an AC-DC / CV converter, the output end Vo + of the AC-DC / CV converter is electrically connected with the positive electrode of a load, and the output end T / Vo-of the silicon controlled rectifier dimming module and the output end V / Vo-of the 0-10V dimming module are respectively and electrically connected with the negative electrode of the load.

Description

Technical Field

[0001] The utility model relates to the technical field of dimming circuits, in particular to a constant voltage power supply dimming circuit. Background Art

[0002] The light-emitting principle of LED is different from that of traditional lighting. The same power LED light source has different current and voltage parameters due to different chips, so its internal wiring structure and circuit distribution are also different, resulting in different requirements for dimming drive of light sources of various manufacturers. Therefore, the mismatch between control system and light source electrical appliances has become a common problem in the industry. At the same time, the diversification of LED has also posed higher challenges to the control system. If the control system and lighting equipment are not matched, the lights may go out or flicker, and may damage the LED drive circuit and light source. There are five common dimming methods on the market: DALI dimming, thyristor dimming, PWM dimming, 0 / 1-10V dimming, and DMX dimming. Among them, thyristor dimming and 0 / 1-10V dimming are the commonly used dimming modes for most LED power supplies. At present, some dimming circuits need to be compatible with thyristor dimming and 0 / 1-10V dimming at the same time, but this dimming circuit is generally complex in structure, the two dimming modules interfere with each other, and the dimming effect is not good. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art and to provide a constant voltage power supply dimming circuit that does not interfere with each other.

[0004] According to the constant voltage power dimming circuit of the embodiment of the utility model, it includes a thyristor dimming module, a 0-10V dimming module and an AC-DC / CV converter, the output terminal Vo+ of the AC-DC / CV converter is electrically connected to the positive electrode of the load, and the output terminal T / Vo- of the thyristor dimming module and the output terminal V / Vo- of the 0-10V dimming module are electrically connected to the negative electrode of the load respectively.

[0005] According to some embodiments of the utility model, the thyristor dimming module includes a rectifier unit, a main control chip U1, an optocoupler U2, a resistor R1, a resistor R2, a resistor R5 and a MOS tube Q1, one end of the resistor R1 is electrically connected to an output end of the rectifier unit, the other end of the resistor R1 is respectively electrically connected to the input end of the main control chip U1 and one end of the resistor R2, the other end of the resistor R2 is respectively grounded to the other output end of the rectifier bridge, the PWM output end of the main control chip U1 is electrically connected to the input end of the optocoupler U2, one end of the resistor R5 is electrically connected to an output end of the optocoupler U2, the other end of the resistor R5 is electrically connected to the positive electrode of the load, the other output end of the optocoupler U2 is electrically connected to the gate of the MOS tube Q1, the source of the MOS tube Q1 is grounded, and the drain of the MOS tube Q1 is the output end T / Vo-.

[0006] According to some embodiments of the present invention, a thyristor dimmer is further included, and the output end of the thyristor dimmer is electrically connected to the input end of the AC-DC / CV converter and the input end of the thyristor dimming module respectively to control the working state of the thyristor dimming module.

[0007] According to some embodiments of the present utility model, the 0-10V dimming module includes a resistor R3, a resistor R4, a main control chip U3 and a MOS tube Q2, one end of the resistor R3 is connected to a 10V voltage, the other end of the resistor R3 is electrically connected to one end of the resistor R4 and the input end of the main control chip U3, respectively, the other end of the resistor R4 is connected to a 0V voltage, the PWM output end of the main control chip U3 is electrically connected to the gate of the MOS tube Q2, the source of the MOS tube Q2 is grounded, and the drain of the MOS tube Q2 is the output end V / Vo-.

[0008] According to some embodiments of the present invention, a 0-10V dimmer is further included, wherein a 10V output end of the 0-10V dimmer is electrically connected to one end of the resistor R3 , and a 0V output end of the 0-10V dimmer is electrically connected to the other end of the resistor R4 .

[0009] According to the constant voltage power dimming circuit of the embodiment of the utility model, at least the following beneficial effects are achieved: the AC-DC / CV converter outputs a DC voltage to input the positive pole of the load, and when a thyristor dimming module is used, the thyristor dimming module outputs a stable PWM signal, and accurate dimming control is achieved through the output terminal T / Vo-. At this time, the 0-10V dimming module is in a suspended state and does not consume any electrical energy, and there is no flickering in the whole process; when the 0-10V dimming module is used, the dimming control is performed through the output terminal V / Vo-. Since the input terminal is not connected to the thyristor dimming, the thyristor in the thyristor dimming module is in a suspended state and does not consume electrical energy, and the two do not interfere with each other; and the two dimming modules share a positive output terminal Vo+, and only one output port is added, which not only prevents the two dimming modes from interfering with each other, but also achieves perfect dimming control, with a simple structure and cost savings.

[0010] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings;

[0012] Figure 1 It is the schematic diagram of the constant voltage power supply dimming circuit. DETAILED DESCRIPTION

[0013] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0014] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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.

[0015] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0016] Reference Figure 1The utility model discloses a constant voltage power supply dimming circuit, a thyristor dimming module, a 0-10V dimming module and an AC-DC / CV converter, wherein the output terminal Vo+ of the AC-DC / CV converter is electrically connected to the positive electrode of the load, and the output terminal T / Vo- of the thyristor dimming module and the output terminal V / Vo- of the 0-10V dimming module are electrically connected to the negative electrode of the load respectively. The thyristor dimming module includes a rectifier unit, a main control chip U1, an optocoupler U2, a resistor R1, a resistor R2, a resistor R5 and a MOS tube Q1. One end of the resistor R1 is electrically connected to an output end of the rectifier unit, the other end of the resistor R1 is electrically connected to the input end of the main control chip U1 and one end of the resistor R2 respectively, the other end of the resistor R2 and the other output end of the rectifier bridge are grounded respectively, the PWM output end of the main control chip U1 is electrically connected to the input end of the optocoupler U2, one end of the resistor R5 is electrically connected to an output end of the optocoupler U2, the other end of the resistor R5 is electrically connected to the positive electrode of the load, the other output end of the optocoupler U2 is electrically connected to the gate of the MOS tube Q1, and the drain of the MOS tube Q1 is the output end T / Vo-. The 0-10V dimming module includes a resistor R3, a resistor R4, a main control chip U3 and a MOS tube Q2. One end of the resistor R3 is connected to a 10V voltage, and the other end of the resistor R3 is electrically connected to one end of the resistor R4 and the input end of the main control chip U3 respectively. The other end of the resistor R4 is connected to a 0V voltage. The PWM output end of the main control chip U3 is electrically connected to the gate of the MOS tube Q2. The source of the MOS tube Q2 is grounded, and the drain of the MOS tube Q2 is the output end V / Vo-.

[0017] like Figure 1 , further comprising a thyristor dimmer and a 0-10V dimmer, wherein the output end of the thyristor dimmer is electrically connected to the input end of the AC-DC / CV converter and the input end of the thyristor dimmer module respectively to control the working state of the thyristor dimmer module. The 10V output end of the 0-10V dimmer is electrically connected to one end of the resistor R3, and the 0V output end of the 0-10V dimmer is electrically connected to the other end of the resistor R4.

[0018] That is, the AC-DC / CV converter outputs a DC voltage to the positive pole of the input load. When using thyristor dimming, the AD pin of the main control chip U1 detects the voltage after the thyristor dimmer is cut, and the value obtained after the voltage is divided by resistors R1 and R2 is converted into a stable PWM signal through complex calculations. The PWM signal is isolated by the optocoupler U2 and then transmitted to the secondary MOS tube Q1 to achieve precise dimming control. The MOS tube Q2 is in a suspended state and does not consume any electrical energy. There is no flickering in the whole process, and the dimmer brand is not selected. The output ports are Vo+ and T / Vo. When using 0-10V dimming, since the input end is not connected to the thyristor dimming, the output end is always at the highest output. At this time, the AD pin of the secondary main control chip U3 detects the 0-10V port and the voltage signal obtained after the resistor R3 and the resistor R4 divide the voltage. After calculation, it is converted into a PWM signal and transmitted to the MOS tube Q2 to achieve precise dimming control. The MOS tube Q1 is in a suspended state and does not consume power. The output ports are Vo+ and V / Vo; and the two dimming modules share a positive output terminal Vo+. Only one output port is added, which not only prevents the two dimming methods from interfering with each other, but also achieves perfect dimming control, with a simple structure and cost savings.

[0019] It is easy for those skilled in the art to understand that the above preferred embodiments can be freely combined and superimposed without conflict.

[0020] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A constant voltage power supply dimming circuit, characterized in that: include: A thyristor dimming module (10), a 0-10V dimming module (20) and an AC-DC / CV converter, wherein the output terminal Vo+ of the AC-DC / CV converter is electrically connected to the positive electrode of a load, and the output terminal T / Vo- of the thyristor dimming module (10) and the output terminal V / Vo- of the 0-10V dimming module (20) are respectively electrically connected to the negative electrode of the load.

2. The constant voltage power dimming circuit according to claim 1, characterized in that: The thyristor dimming module (10) comprises a rectifier unit, a main control chip U1, an optical coupler U2, a resistor R1, a resistor R2, a resistor R5 and a MOS tube Q1, one end of the resistor R1 is electrically connected to an output end of the rectifier unit, the other end of the resistor R1 is electrically connected to an input end of the main control chip U1 and one end of the resistor R2 respectively, the other end of the resistor R2 and the other output end of the rectifier bridge are grounded respectively, the PWM output end of the main control chip U1 is electrically connected to the input end of the optical coupler U2, one end of the resistor R5 is electrically connected to an output end of the optical coupler U2, the other end of the resistor R5 is electrically connected to the positive electrode of the load, the other output end of the optical coupler U2 is electrically connected to the gate of the MOS tube Q1, the source of the MOS tube Q1 is grounded, and the drain of the MOS tube Q1 is the output end T / Vo-.

3. The constant voltage power dimming circuit according to claim 1, characterized in that: It also comprises a thyristor dimmer, the output end of which is electrically connected to the input end of the AC-DC / CV converter and the input end of the thyristor dimming module (10) respectively, so as to control the working state of the thyristor dimming module.

4. The constant voltage power dimming circuit according to claim 1, characterized in that: The 0-10V dimming module (20) comprises a resistor R3, a resistor R4, a main control chip U3 and a MOS tube Q2, one end of the resistor R3 is connected to a 10V voltage, the other end of the resistor R3 is electrically connected to one end of the resistor R4 and the input end of the main control chip U3 respectively, the other end of the resistor R4 is connected to a 0V voltage, the PWM output end of the main control chip U3 is electrically connected to the gate of the MOS tube Q2, the source of the MOS tube Q2 is grounded, and the drain of the MOS tube Q2 is the output end V / Vo-.

5. The constant voltage power dimming circuit according to claim 4, characterized in that: It also includes a 0-10V dimmer, wherein a 10V output end of the 0-10V dimmer is electrically connected to one end of the resistor R3, and a 0V output end of the 0-10V dimmer is electrically connected to the other end of the resistor R4.

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