CN214338172U

CN214338172U - Circuit applied between MCU (microprogrammed control Unit) and BUCK (BUCK) dimming interfaces

Info

Publication number: CN214338172U
Application number: CN202022040146.2U
Authority: CN
Inventors: 于绍强; 林云; 徐华军; 黄璟瑜; 刘昌赞
Original assignee: Shenzhen Xiezhen Electronics Co ltd
Current assignee: Shenzhen Xiezhen Electronics Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-10-01
Anticipated expiration: 2030-09-17

Abstract

The utility model discloses an use circuit between MCU and BUCK interface of adjusting luminance makes the curve of adjusting luminance not receive the interference between the IC, adjusts luminance more accurate, more stable application. A more ideal direct-current voltage is obtained through a second-order RC low-pass filter circuit, and meanwhile, PWM pulse width modulation of the BUCK dimming interface is achieved through a field effect transistor Q7. A circuit is added between the MCU and the BUCK dimming interface, and the circuit comprises a resistor R90, a capacitor C41, a resistor R57, a capacitor C11, a resistor R15 and a field effect transistor Q7; the utility model discloses utilize second order RC filtering circuit and field effect transistor switch disconnected action to control BUCKT interface of adjusting luminance, let the effect of originally ordinary single adjusting luminance more stable.

Description

Circuit applied between MCU (microprogrammed control Unit) and BUCK (BUCK) dimming interfaces

Technical Field

The utility model relates to a well electronic circuit technical field specifically is an use circuit between MCU and BUCK interface of adjusting luminance.

Background

No circuit is added between the traditional MCU and the BUCK dimming interface; the simple circuit has the advantages that the dimming signal is greatly interfered by ripples, the generated high-frequency signal is easily influenced by peripheral circuits, the dimming effect is unstable, and the lamp flashing and dimming consistency effects are easily caused to be poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a circuit between MCU and BUCK interface of adjusting luminance utilizes the circuit to make the curve of adjusting luminance not receive the interference between the IC, adjusts luminance more stable accurate application.

In order to realize the purpose, the direct current is obtained through second-order RC filtering, so that the suppression capability on the signals outside the same frequency band is stronger; the circuit from the control chip MCU to the BUCK dimming signal line comprises a resistor R90, a capacitor C41, a resistor R57, a capacitor C11, a resistor R15 and a field effect transistor Q7.

Preferably, the filter circuit comprises a resistor R90, a capacitor C41, a resistor R57 and a capacitor C11, and preferably, the PWM pulse width modulation of the BUCK dimming interface comprises a resistor R15 and a field effect transistor Q7.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses utilize second order RC filtering, field effect transistor pulse width modulation makes the curve of adjusting luminance not receive the interference between the IC, adjusts luminance more stable accurate application, has good economic benefits and social, suitable using widely.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

Detailed Description

The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present invention provides a technical solution: a circuit between MCU and BUCK dimming interface can prevent dimming curve from interference between ICs, and can more stably and accurately dim light. The direct current is obtained through second-order RC filtering, so that the suppression capability on the signals with the same frequency band is stronger; the control chip MCU is connected with a BUCK dimming signal circuit and an electric circuit, and the electric circuit comprises a resistor R90, a capacitor C41, a resistor R57, a capacitor C11, a resistor R15 and a field effect transistor Q7; the utility model discloses utilize second order RC filter circuit and field effect transistor switch to break and act on, let the effect of ordinary single adjusting luminance originally more stable.

The working principle is as follows: a circuit between an MCU (microprogrammed control Unit) and a BUCK dimming interface comprises a resistor R90, a capacitor C41, a resistor R57 and a capacitor C11 which form a second-order filtering circuit, when a PWM (pulse-width modulation) signal comes out from an ISET-PWM (integrated circuit) port of the MCU, an RC filtering circuit is formed by the resistor R90 and the capacitor C41 to filter the signal into direct current, and then secondary filtering is carried out by the RC filtering circuit formed by the resistor R57 and the capacitor C11 again to change the signal into a more ideal direct current signal without interference; then, a pulse width modulation waveform is generated through the turn-off action of a field effect transistor Q7, and a DIM pin is controlled to realize stable and accurate output dimming.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A circuit applied between an MCU (microprogrammed control Unit) and a BUCK dimming interface obtains more ideal direct-current voltage through a second-order RC low-pass filter circuit, meanwhile, PWM (pulse width modulation) pulse width modulation of the BUCK dimming interface is realized through a field effect transistor Q7, and a circuit from the BUCK dimming interface to a control chip MCU comprises a resistor R90, a capacitor C41, a resistor R57, a capacitor C11, a resistor R15 and a field effect transistor Q7.

2. The circuit applied between the MCU and the BUCK dimming interface according to claim 1, wherein the output signal is filtered into a more stable direct current signal through second-order RC filtering in a circuit, and the suppression capability of the same-frequency out-of-band signal is stronger.

3. The circuit of claim 1, wherein the circuit between the MCU and the BUCK dimming interface comprises a filter circuit including a resistor R90, a capacitor C41, a resistor R57, and a capacitor C11.

4. The circuit of claim 1, wherein the circuit is applied between the MCU and the BUCK dimming interface, and comprises: the PWM pulse width modulation of the BUCK dimming interface comprises a resistor R15 and a field effect transistor Q7.