Distributed power-on device resistance-capacitance step-down circuit

Abstract

The utility model discloses a distributed power-on device resistance-capacitance step-down circuit, relates to the technical field of delay starting, and aims to solve the technical problem that the traditional resistance step-down temperature is too high. According to the distributed power-on device resistance-capacitance step-down circuit provided by the embodiment of the utility model, the distributed power-on device is used for power-on in a distributed manner, the impact of large impact current of a display screen on a power grid is reduced, the interference on the power grid is reduced, and the working temperature of resistance-capacitance step-down can be controlled below 40 DEG C.

Description

Technical Field

[0001] The utility model relates to the technical field of delay start-up, in particular to a distributed power-on resistor-capacitor step-down circuit, which is applied to an LED display screen. Background Art

[0002] In the prior art, a time relay is generally used to realize the function of delayed power-on. The time relay is placed in the power distribution cabinet. On the one hand, the time relay is a split design, which is relatively high and thick as a whole, occupies a large space, and is easy to loosen during long-distance transportation, wiring, or vibration, resulting in poor contact. On the other hand, the time relay generally uses resistor step-down, and the temperature rise of resistor step-down is relatively high. The measured temperature on both sides of the surface can reach more than 60 degrees Celsius, and can reach 80 degrees Celsius under direct sunlight, causing the plastic part of the time relay to deform, bringing potential safety hazards. On the other hand, there are a large number of switching power supplies in the LED display screen, all of which are resistor-capacitor components. When a large number of resistor-capacitor components of the switching power supply start at the same time, the current is relatively large, and the current at the moment of a single start can be very large, so that the impact and interference on the power grid are relatively large; Content of the Utility Model

[0003] An embodiment of the utility model provides a distributed power-on resistor-capacitor step-down circuit to at least solve the technical problem of too high temperature of traditional resistor step-down;

[0004] To achieve the above object, the embodiment of the utility model adopts the following technical solutions:

[0005] A distributed power-on resistor-capacitor step-down circuit includes: five capacitors C, two resistors R, a rectifier bridge BR composed of four diodes, a zener diode Z, an adjustable resistor RVAR, an IC, a relay coil rc, a high-speed switching diode D1, and a light-emitting diode D2;

[0006] The five capacitors C include: a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, and the two resistors R include a first resistor R1 and a second resistor R2;

[0007] The first capacitor C1 is connected in parallel with the first resistor R1. One connection point of the rectifier bridge BR is connected to the first capacitor C1, and the other connection point of the rectifier bridge BR is connected to the power supply AC. The remaining two connection points of the rectifier bridge BR are respectively connected to two lines. The two terminals of the second capacitor C2 are respectively connected to the two lines. The two terminals of the third capacitor C3 are respectively connected to the two lines. The two terminals of the zener diode Z are respectively connected to the two lines. One terminal of the fourth capacitor C4 is connected to one of the lines, and the other terminal of the fourth capacitor C4 is connected to one terminal of the adjustable resistor RVAR, forming a connection point. The other terminal of the adjustable resistor RVAR is connected to the other line;

[0008] The IC has 7 terminals, namely terminals 1, 2, 3, 4, 5, 6, and 8. Among them, terminals 2 and 6 are connected in parallel and then connected to the connection point. Terminals 4 and 8 are respectively connected to one of the lines. Terminal 1 is connected to the other line. Terminal 5 is connected to the fifth capacitor C5, and the fifth capacitor C5 is connected to the other line. Terminal 3 is connected to another line;

[0009] The two terminals of the high-speed switching diode D1 are respectively connected to the other line and another line. The relay coil rc is connected in parallel with the high-speed switching diode D1. The second resistor R2 and the light-emitting diode D2 are connected in series and then connected in parallel with the high-speed switching diode D1.

[0010] Optionally, the above distributed electrical appliance resistor-capacitor step-down circuit further includes: a fuse FU, and the first capacitor C1 is connected in series with the fuse FU.

[0011] Advantageous effects: The distributed electrical appliance resistor-capacitor step-down circuit provided by the embodiment of the present invention uses distributed electrical appliances for distributed power-on, reduces the impact of the large inrush current of the display screen on the power grid, reduces the interference to the power grid, and the operating temperature of the resistor-capacitor step-down can be controlled below 40 degrees. Description of the Drawings

[0012] Figure 1 It is a circuit diagram of a distributed electrical appliance resistor-capacitor step-down; Detailed Embodiments

[0013] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0014] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0015] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0016] As Figure 1 shown, a distributed mains voltage dropping circuit by resistor-capacitor includes: five capacitors C, two resistors R, a rectifier bridge BR composed of four diodes, a zener diode Z, an adjustable resistor RVAR, an IC, a relay coil rc, a high-speed switching diode D1, and a light-emitting diode D2.

[0017] The five capacitors C include: a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The two resistors R include a first resistor R1 and a second resistor R2.

[0018] Specifically, the first capacitor C1 is a 0.474 μF capacitor with a withstand voltage of 630 V;

[0019] The second capacitor C2 is labeled 104, a 0.1 μF capacitor with a withstand voltage of 63 V;

[0020] The third capacitor C3 is a 220 μF capacitor with a withstand voltage of 25 V;

[0021] The fourth capacitor C4 is a 220 μF capacitor with a withstand voltage of 25 V;

[0022] The first resistor R1 is a 680 K, 1 / 8 W resistor;

[0023] The second resistor R2 is a 1 K resistor;

[0024] The IC is NE555;

[0025] The high-speed switching diode D1 is 1N4148;

[0026] The rectifier bridge BR composed of four diodes is 1N4007.

[0027] Optionally, the first capacitor C1 is connected in parallel with the first resistor R1. One of the contacts of the rectifier bridge BR is connected to the first capacitor C1, and the other contact of the rectifier bridge BR is connected to the power supply AC. The remaining two contacts of the rectifier bridge BR are respectively connected to two lines. The two terminals of the second capacitor C2 are respectively connected to the two lines. The two terminals of the third capacitor C3 are respectively connected to the two lines. The two terminals of the zener diode Z are respectively connected to the two lines. One terminal of the fourth capacitor C4 is connected to one of the lines, and the other terminal of the fourth capacitor C4 is connected to one terminal of the adjustable resistor RVAR, forming a connection point. The other terminal of the adjustable resistor RVAR is connected to the other line.

[0028] Optionally, the IC has 7 terminals, namely terminals 1, 2, 3, 4, 5, 6, and 8. Among them, terminals 2 and 6 are connected in parallel and then connected to the connection point. Terminals 4 and 8 are respectively connected to one of the lines. Terminal 1 is connected to the other line. Terminal 5 is connected to the fifth capacitor C5, and the fifth capacitor C5 is connected to the other line. Terminal 3 is connected to another line.

[0029] Optionally, the two terminals of the high-speed switching diode D1 are respectively connected to the other line and another line. The relay coil rc is connected in parallel with the high-speed switching diode D1. The second resistor R2 and the light-emitting diode D2 are connected in series and then connected in parallel with the high-speed switching diode D1.

[0030] Optionally, the above-mentioned distributed electrical appliance resistance-capacitance step-down circuit further includes: a fuse FU, and the first capacitor C1 is connected in series with the fuse FU.

[0031] A distributed electrical appliance is of an integrated design, which is overall thin and light, reducing the occupied space. It includes an input end and an output end, and also includes a knob for adjusting time, and is professionally applicable to LED displays;

[0032] The utility model is applied to a distribution cabinet and can realize delayed power-on.

[0033] The function of the distributed electrical appliance in the embodiment of the utility model is to start with a delay. For example, when equipment with a power of 50 kilowatts starts simultaneously, the current is too large, and the instantaneous current has a great impact on the power grid. Through the distributed electrical appliance, it is divided into multiple segments. First, start a part of the equipment with a certain number of kilowatts, then start another part of the equipment with a certain number of kilowatts, and finally start the remaining equipment with a certain number of kilowatts. Set a sequential time between each part of the start to perform delayed start. The time range of the delayed start is 0 seconds - 24 seconds;

[0034] The working principle of the distributed power supply in the embodiment of the present utility model: First, step-down through resistance-capacitance, then through the IC, and then charge and discharge the capacitor for time delay to make the internal relay close, so as to control the large external alternating current to work, and control the large-current AC contactor through small current;

[0035] In one embodiment: For a 50-kilowatt device, it is divided into three sections for time-delay starting, and three large AC contactors are used to work. Each is interspersed with a distributed power supply to control the starting sequence of the AC contactors. After the first large AC contactor starts, a time delay of 8 seconds is controlled. The second and third AC contactors also start after a time delay of 8 seconds, reducing the instantaneous current and avoiding the impact of the instantaneous current on the power grid.

[0036] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0037] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claimed rights.

Claims

1. A distributed upper electrical appliance resistance-capacitance step-down circuit, characterized in that: It includes five capacitors C, two resistors R, a rectifier bridge BR composed of four diodes, a voltage-stabilizing diode Z, an adjustable resistor RVAR, an IC, a relay coil rc, a high-speed switching diode D1 and a light-emitting diode D2; The five capacitors C include: a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5, and the two resistors R include a first resistor R1 and a second resistor R2; The first capacitor C1 is connected in parallel with the first resistor R1, one of the contacts of the rectifier bridge BR is connected to the first capacitor C1, another contact of the rectifier bridge BR is connected to the power supply AC, the remaining two contacts of the rectifier bridge BR are respectively connected to two lines, two terminals of the second capacitor C2 are respectively connected to the two lines, two terminals of the third capacitor C3 are respectively connected to the two lines, two terminals of the voltage regulator diode Z are respectively connected to the two lines, one terminal of the fourth capacitor C4 is connected to one of the lines, another terminal of the fourth capacitor C4 is connected to one of the terminals of the adjustable resistor RVAR to form a connection point, and another terminal of the adjustable resistor RVAR is connected to another line; The IC has 7 terminals, namely terminals 1, 2, 3, 4, 5, 6 and 8, wherein terminals 2 and 6 are connected in parallel to the connection point, terminals 4 and 8 are connected to one of the lines respectively, terminal 1 is connected to another line, terminal 5 is connected to a fifth capacitor C5, the fifth capacitor C5 is connected to another line, and terminal 3 is connected to another line; The two connection terminals of the high-speed switch diode D1 are respectively connected to another circuit and another circuit, the relay coil rc is connected in parallel with the high-speed switch diode D1, and the second resistor R2 is connected in series with the light-emitting diode D2 and then connected in parallel with the high-speed switch diode D1.

2. A distributed upper electrical appliance resistance-capacitance step-down circuit according to claim 1, characterized in that: A fuse FU is also included, and the first capacitor C1 is connected in series with the fuse FU.

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