CN210629919U

CN210629919U - Dimming LED controller circuit based on original wiring structure

Info

Publication number: CN210629919U
Application number: CN201821922466.7U
Authority: CN
Inventors: 贾远贵; 王贵娟
Original assignee: Qingdao University Sunbest Technology Co ltd
Current assignee: Qingdao University Sunbest Technology Co ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2020-05-26
Anticipated expiration: 2028-11-21

Abstract

The utility model relates to a LED controller circuit adjusts luminance based on former wiring structure, the circuit includes filter circuit, an isolation power converting circuit, a power modulation circuit adjusts luminance, at least one output load, at least one sampling circuit, a microprocessor, a photoelectric isolation circuit, a rectification step-down circuit and a dimmer switch, the isolation power converting circuit, the power modulation circuit adjusts luminance, the output load sets gradually on a circuit board and links together after being kept apart through the filter circuit, sampling circuit one end is connected the output load, its other end is connected the power modulation circuit adjusts luminance; the utility model discloses two-stage switch power output control, power control is more steady, does not have the stroboscopic.

Description

Dimming LED controller circuit based on original wiring structure

Technical Field

The utility model relates to a control circuit, more specifically say and relate to a LED controller circuit adjusts luminance based on former wiring structure.

Background

In industrial production, a device or a control circuit is provided with a chip, and a power-on circuit for the chip is required to provide necessary power supply voltage. In the conventional power-on control circuit as shown in fig. 2, the external power voltage directly connects the power supply to the input voltage, and there is an overshoot voltage at the start-up or power-on instant. The overshoot voltage directly affects the rear-end chip, and after power failure, the output end also has output, and the chip hung behind the voltage stabilizing circuit chip is subjected to high-voltage impact of more than 2 times of the limit voltage within a few milliseconds, so that adverse effects are caused to rear-end chip equipment, and particularly for a dimming LED control circuit, the control can be completed only by rewiring. Therefore, users want to replace the original lighting fixture to a dimmable LED fixture, change the original circuit wiring, and cannot use the original switch or button to realize dimming and switching.

Disclosure of Invention

The utility model provides a LED controller circuit adjusts luminance based on former wiring structure through innovation circuit design, promotes greatly and switches on the ability of ending, realizes the dimming to the little control chip of rear end, need not to rewire just can carry out the LED lamp controller circuit that adjusts luminance, accomplishes the safety and stability function of adjusting luminance.

The technical scheme of the utility model is that:

a dimming LED controller circuit based on an original wiring structure comprises a filter circuit, an isolation power conversion circuit, a dimming power modulation circuit, at least one output load, at least one sampling circuit, a microprocessor, a photoelectric isolation circuit, a rectification step-down circuit and a dimming switch, wherein the isolation power conversion circuit, the dimming power modulation circuit and the output load are sequentially arranged on a circuit board and are connected together after being isolated by the filter circuit, one end of the sampling circuit is connected with the output load, and the other end of the sampling circuit is connected with the dimming power modulation circuit;

the dimming switch, the rectification voltage-reducing circuit, the photoelectric isolation circuit and the microprocessor are arranged on the circuit board and are sequentially connected, and the microprocessor is connected with the dimming power modulation circuit;

one end of the dimming switch is connected to the front end of the isolation power conversion circuit.

The circuit is provided with two-stage switch power output control, so that the power control is more stable without stroboflash.

The filter circuit comprises a power frequency rectification filter circuit, a rectification filter circuit II and a rectification filter circuit III.

The filter circuit comprises an EMI filter circuit, a power frequency rectification filter circuit, a rectification filter circuit II and a rectification filter circuit III.

One end of the EMI filter circuit is connected with AC220V voltage, the other end of the EMI filter circuit is connected with the power frequency rectification filter circuit and the public end of the dimming switch, and the other end of the power frequency rectification filter circuit is connected with the isolation power conversion circuit.

And the second rectification filter circuit is arranged between the isolation power conversion circuit and the dimming power modulation circuit and is connected with the isolation power conversion circuit and the dimming power modulation circuit.

And the third rectifying and filtering circuit is arranged between the output load and the dimming power modulation circuit and is connected with the output load and the dimming power modulation circuit.

Has the advantages that:

1) the utility model prevents external electromagnetic interference through the EMI filter circuit, obtains high voltage direct current through the power frequency rectifier circuit, obtains high frequency power output through the isolation power conversion circuit with voltage current negative feedback, obtains steady voltage direct current output through the rectifier filter circuit, and the circuit stability effect is obvious;

2) the utility model discloses a direct current output signal obtains the composite frequency chopping signal output through PWM and another frequency signal modulation through adjusting luminance power modulation circuit, and this chopping signal power suits with corresponding brightness control, and the load is supplied with through rectification filter circuit to the back. The load output is fed back to the dimming power control circuit through the sampling circuit, and the stability of the output power is guaranteed.

3) The dimming power modulation circuit is controlled by the output of the microprocessor, is in a closed state when no PWM (pulse-width modulation) signal is output, does not output a signal to a load, and compounds the PWM signal and a self frequency signal when the PWM signal is output, so that the circuit design is highly innovative;

4) the microprocessor is controlled by the dimming switch through the photoelectric isolation circuit and the rectification voltage reduction circuit; there are four situations that combine the dimmer switch and the current state of the load: the switch is turned on, turned off, the brightness is increased and the brightness is reduced, if the switch is turned off originally, the short-press switch is turned off originally, the power of the long-press switch is gradually increased in a constant state, and the power is gradually reduced by long-press immediately after the short-press switch is pressed in the constant state.

5) The utility model discloses two-stage switch power output control, power control is more steady, does not have the stroboscopic.

Drawings

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

Fig. 2 is a schematic diagram of the present invention without an EMI circuit.

Fig. 3 is a schematic diagram of the light-adjusting switch circuit of the double-wire connection management and control of the present invention.

FIG. 4 is a schematic diagram of a microprocessor with a photo-isolation circuit and a rectifying and voltage-reducing circuit.

Fig. 5 is a unique two-stage switching power output control diagram of the present invention.

Fig. 6 shows a one-level voltage feedback and a two-level current feedback diagram of the circuit of the present invention.

The specific implementation mode is as follows:

this embodiment is the utility model discloses a feasible implementation scheme, it is shown with reference to fig. 1 to 6 to refer to, the utility model discloses a four filter circuit (AC/DC), an isolation power conversion circuit (voltage current feedback DC/AC), a power modulation circuit of adjusting luminance (DC/AC), at least one output load, at least one sampling circuit, a microprocessor, a photoelectric isolation circuit, a rectification step-down circuit and a switch of adjusting luminance, four filter circuit include EMI filter circuit, power frequency rectification filter circuit, rectification filter circuit two and rectification filter circuit three. The isolation power conversion circuit, the dimming power modulation circuit and the output load are sequentially arranged on a circuit board and are connected together after being isolated by the filter circuit, and one end of the dimming switch is connected to the front end of the isolation power conversion circuit. The second rectification filter circuit is arranged between the isolation power conversion circuit and the dimming power modulation circuit and is connected with the isolation power conversion circuit and the dimming power modulation circuit; and the third rectifying and filtering circuit is arranged between the output load and the dimming power modulation circuit and is connected with the output load and the dimming power modulation circuit. One end of the sampling circuit is connected with the output load, and the other end of the sampling circuit is connected with the dimming power modulation circuit; the dimming switch, the rectification voltage-reducing circuit, the photoelectric isolation circuit and the microprocessor are arranged on the circuit board and are sequentially connected, and the microprocessor is connected with the dimming power modulation circuit; one end of the dimming switch is connected to the front end of the isolation power conversion circuit. One end of the EMI filter circuit is connected with AC220V voltage, the other end of the EMI filter circuit is connected with the power frequency rectification filter circuit and the public end of the dimming switch, and the other end of the power frequency rectification filter circuit is connected with the isolation power conversion circuit. Fig. 4 is a diagram of a microprocessor receiving a dimming state and a light-on state through a photoelectric isolation circuit and a rectification voltage-reduction circuit, and analyzing the circuit behavior by combining a load state: on, off, increase brightness, decrease brightness, and chop the dimming natural frequency in the form of a PWM signal from the analysis result. Fig. 5 shows two-stage switching power output control, which is more stable and free of stroboflash.

AC220V voltage prevents external electromagnetic interference through EMI circuit, then obtains high voltage direct current through power frequency rectification circuit, then obtains high frequency power output through isolation power conversion circuit with voltage current negative feedback, and obtains stabilized direct current output through rectification filter circuit; the direct current output signal is output as a composite frequency chopping signal modulated by PWM and another frequency signal through a dimming power modulation circuit, the chopping signal power is adaptive to corresponding brightness control, and then the chopping signal power is supplied to a load through a rectifying and filtering circuit. The load output is fed back to the dimming power control circuit through the sampling circuit so as to ensure the stability of the output power. The dimming power modulation circuit is controlled by the output of the microprocessor, is in a closed state when no PWM (pulse-width modulation) signal is output, does not output a signal to a load, and compounds the PWM signal and a self frequency signal when the PWM signal is output; fig. 6 shows that the circuit has one-stage voltage feedback and two-stage current feedback, the power distribution of the circuit is uniform, the load of the component is small, and the service life is long. The microprocessor is controlled by the control of light adjustment and light turning through the photoelectric isolation circuit and the rectification voltage reduction circuit; there are four situations that combine the dimmer switch and the current state of the load: the switch is turned on if the switch is off, the short-press switch is turned off if the switch is on, the power of the long-press switch is gradually increased in a constant state, and the power is gradually decreased immediately after the short-press switch is pressed in the constant state.

Claims

1. The utility model provides a LED controller circuit of adjusting luminance based on former wiring structure which characterized by: the circuit comprises a filter circuit, an isolation power conversion circuit, a dimming power modulation circuit, at least one output load, at least one sampling circuit, a microprocessor, a photoelectric isolation circuit, a rectification voltage-reducing circuit and a dimming switch, wherein the isolation power conversion circuit, the dimming power modulation circuit and the output load are sequentially arranged on a circuit board and are connected together after being isolated by the filter circuit, one end of the sampling circuit is connected with the output load, and the other end of the sampling circuit is connected with the dimming power modulation circuit; the dimming switch, the rectification voltage-reducing circuit, the photoelectric isolation circuit and the microprocessor are arranged on the circuit board and are sequentially connected, and the microprocessor is connected with the dimming power modulation circuit; one end of the dimming switch is connected to the front end of the isolation power conversion circuit; two-stage switch power output control is provided.

2. The original wire structure based dimming LED controller circuit of claim 1, wherein: the filter circuit comprises a power frequency rectification filter circuit, a rectification filter circuit II and a rectification filter circuit III.

3. The original wire structure based dimming LED controller circuit of claim 1, wherein: the filter circuit comprises an EMI filter circuit, a power frequency rectification filter circuit, a rectification filter circuit II and a rectification filter circuit III.

4. The original wire structure based dimming LED controller circuit of claim 3, wherein: one end of the EMI filter circuit is connected with AC220V voltage, the other end of the EMI filter circuit is connected with the power frequency rectification filter circuit and the public end of the dimming switch, and the other end of the power frequency rectification filter circuit is connected with the isolation power conversion circuit.

5. The original wire structure based dimming LED controller circuit according to claim 3 or 2, wherein: and the second rectification filter circuit is arranged between the isolation power conversion circuit and the dimming power modulation circuit and is connected with the isolation power conversion circuit and the dimming power modulation circuit.

6. The original wire structure based dimming LED controller circuit according to claim 5, wherein: and the third rectifying and filtering circuit is arranged between the output load and the dimming power modulation circuit and is connected with the output load and the dimming power modulation circuit.