CN216565667U

CN216565667U - Dimming control circuit with bidirectional electrostatic protection

Info

Publication number: CN216565667U
Application number: CN202122790302.1U
Authority: CN
Inventors: 周锐宗
Original assignee: Dongguan Huihai Semiconductor Co ltd
Current assignee: Dongguan Huihai Semiconductor Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-05-17
Anticipated expiration: 2031-11-15

Abstract

The embodiment of the utility model discloses a dimming control circuit with bidirectional electrostatic protection, which comprises an alternating current power supply, wherein the alternating current power supply is connected with a power adjusting module through a rectifying module, the power adjusting module is respectively connected with a control circuit and a load driving circuit, two groups of electrostatic protection circuits are arranged on the load driving circuit in parallel, and two groups of electrostatic protection circuits are respectively provided with a diode in opposite directions; based on the control circuit structure, the electrostatic protection circuit is arranged on the load driving circuit, so that the load driving circuit can independently form a loop, and the diodes in different directions are arranged on the load driving circuit to achieve the purpose of eliminating static electricity.

Description

Dimming control circuit with bidirectional electrostatic protection

Technical Field

The embodiment of the utility model relates to the technical field of regulation and control circuits, in particular to a dimming control circuit with bidirectional electrostatic protection.

Background

The circuit is a core structure for driving a load to operate, and in the existing circuit structure, the control structure is often realized through the circuit, especially in the field of lighting, with continuous innovation and perfection of the driving technology, and the user's demand is continuously increased, which has gradually changed from the originally required high brightness and low efficacy to the requirements in the aspects of dimming characteristics, light quality, and the like.

The intelligent lighting is used as a part of an intelligent home, and a user can carry out dimming and color mixing control according to the current use requirement to obtain the required lighting condition. In this process, the adjustment is realized by a circuit. Related adjusting circuits in the prior art are many, such as the problems of improving the adjusting precision, and reducing the design cost, such as reducing the structure. However, in the circuit structure, static electricity is generated during operation, which provides a new test for the antistatic performance of the existing material, such as the static decay time constant of the material. Based on the consideration of the existing circuit, in practice, the static electricity generating part is only required to form a circuit and is provided with a load, the static electricity of the static electricity generating part generates current and is eliminated within a limited controllable range, and the prior art has no related technical scheme.

Disclosure of Invention

Therefore, the embodiment of the utility model provides a dimming control circuit with bidirectional electrostatic protection, so as to solve the technical problem of electrostatic problem in the prior art.

In order to achieve the above object, an embodiment of the present invention provides the following:

a dimming control circuit with bidirectional electrostatic protection comprises an alternating current power supply, wherein the alternating current power supply is connected with a power adjusting module through a rectifying module, and the power adjusting module is respectively connected with a control circuit and a load driving circuit;

the load driving circuit is provided with two groups of electrostatic protection circuits in parallel, and the two groups of electrostatic protection circuits are respectively provided with a diode in opposite directions.

In a preferred embodiment of the present invention, the two sets of electrostatic protection circuits have the same connection point with the load driving circuit, and are both directly connected to a load on the load driving circuit.

As a preferable aspect of the present invention, the control circuit includes a bridge type controllable rectifying circuit and a single junction transistor triggering circuit, and the bridge type controllable rectifying circuit and the single junction transistor triggering circuit are connected in parallel through a thyristor VT.

As a preferable scheme of the present invention, the bridge controllable rectification circuit includes a group of rectifier diodes VD respectively connected to an input end and an output end of the ac power supply, and directions of the two groups of rectifier diodes VD are the same.

As a preferable solution of the present invention, the number of the rectifier diodes VD in each group is two diodes.

In a preferred embodiment of the present invention, the single junction transistor trigger circuit includes a resistor R1, a resistor R2, and a resistor R3 connected in series in this order, and a potentiometer RP, a resistor R4, and a capacitor C are connected in parallel to the resistor R2 and the resistor R3.

The embodiment of the utility model has the following advantages:

based on the control circuit structure, the electrostatic protection circuit is arranged on the load driving circuit, so that the load driving circuit can independently form a loop, and the diodes in different directions are arranged on the load driving circuit to achieve the purpose of eliminating static electricity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a block diagram of the structure in an embodiment of the present invention;

fig. 2 is a schematic circuit diagram according to an embodiment of the present invention.

In the figure: 1-an alternating current power supply; 2, a rectification module; 3-a power regulation module; 4-a control circuit; 5-a load driving circuit; 6-electrostatic protection circuit; 7-diode.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

As shown in fig. 1, the present invention provides a dimming control circuit with bidirectional electrostatic protection, which includes an ac power supply 1, wherein the ac power supply 1 is connected to a power adjusting module 3 through a rectifying module 2, and the power adjusting module 3 is respectively connected to a control circuit 4 and a load driving circuit 5.

The load driving circuit 5 is provided with two groups of electrostatic protection circuits 6 in parallel, and the two groups of electrostatic protection circuits 6 are respectively provided with a diode 7 with opposite directions, in the embodiment, the electrostatic protection circuits 6 are provided with diodes with different directions, so the directions are different, and further, the two groups of electrostatic protection circuits 6 are the same as the connection points of the load driving circuit 5 and are directly connected with the load on the load driving circuit 5.

In this embodiment, the electrostatic protection circuit 6 forms an independent loop, and diodes in different directions are provided thereon to achieve the purpose of eliminating static electricity.

As shown in fig. 2, the control circuit 4 includes a bridge type controllable rectifying circuit and a single junction transistor trigger circuit, and the bridge type controllable rectifying circuit and the single junction transistor trigger circuit are connected in parallel through a thyristor VT.

The bridge type controllable rectifying circuit comprises a group of rectifying diodes VD which are positioned at the input end and the output end of the alternating current power supply 1 and are connected with the same direction. The number of each group of rectifying diodes VD is two diodes (VD 1-VD 4).

The unijunction transistor trigger circuit comprises a resistor R1, a resistor R2 and a resistor R3 which are sequentially connected in series, and a potentiometer RP, a resistor R4 and a capacitor C are connected in parallel to the resistor R2 and the resistor R3.

Based on the foregoing, the specific working process thereof is as follows:

after the power supply is switched on, alternating current is rectified in a bridge mode and then provides forward voltage for the anode of the unidirectional thyristor, the forward voltage is added to the base electrode of the unijunction transistor through R2 and R3, meanwhile, the capacitor C is charged through the resistors R1, RP and R4, when the voltage at two ends of the capacitor C is larger than the conducting voltage of the unijunction transistor, the unijunction transistor is conducted, a trigger pulse signal is provided for the thyristor, the potentiometer RP is adjusted, the size of the trigger delay angle of the unidirectional thyristor can be changed, the period of the trigger pulse output by the unijunction transistor trigger circuit is changed, and therefore the size of the output voltage is changed, and the brightness of a bulb can be changed.

Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims

1. The dimming control circuit with the bidirectional electrostatic protection is characterized by comprising an alternating current power supply (1), wherein the alternating current power supply (1) is connected with a power adjusting module (3) through a rectifying module (2), and the power adjusting module (3) is respectively connected with a control circuit (4) and a load driving circuit (5);

the load driving circuit (5) is provided with two groups of electrostatic protection circuits (6) in parallel, and the two groups of electrostatic protection circuits (6) are respectively provided with a diode (7) with opposite directions.

2. The dimming control circuit with bidirectional electrostatic protection as claimed in claim 1, wherein the two sets of electrostatic protection circuits (6) are connected to the same connection point of the load driving circuit (5) and are both directly connected to the load on the load driving circuit (5).

3. The dimming control circuit with bidirectional electrostatic protection as claimed in claim 1, wherein the control circuit (4) comprises a bridge controllable rectifying circuit and a single junction transistor triggering circuit, and the bridge controllable rectifying circuit and the single junction transistor triggering circuit are connected in parallel through a thyristor VT.

4. A dimming control circuit with bidirectional electrostatic protection as claimed in claim 3, wherein the bridge controllable rectifying circuit comprises a set of rectifying diodes VD respectively connected to the input and output terminals of the ac power supply (1), and the directions of the two sets of rectifying diodes VD are the same.

5. A dimming control circuit with bidirectional electrostatic protection as claimed in claim 4, wherein the number of the rectifying diodes VD in each group is two diodes.

6. The dimming control circuit with bidirectional electrostatic protection as claimed in claim 5, wherein the unijunction transistor trigger circuit comprises a resistor R1, a resistor R2 and a resistor R3 connected in series in sequence, and a potentiometer RP, a resistor R4 and a capacitor C are connected in parallel to the resistor R2 and the resistor R3.