CN111526626A - A voltage-adjustable phase-cut dimming power supply - Google Patents

Abstract

The invention discloses a voltage-regulating phase-cut dimming power supply, which comprises an electromagnetic filter circuit, a rectifying circuit, a power conversion circuit, a transformer, a rectifying filter circuit, a phase-cut dimming signal conversion circuit, a first optical coupler, a dimming signal conversion circuit, a voltage comparison control circuit, a second optical coupler and a PWM control circuit, wherein the phase-cut dimming signal conversion circuit, the rectifying circuit, the power conversion circuit, the transformer and the rectifying filter circuit are sequentially and electrically connected with the output end of the electromagnetic filter circuit; by means of adjusting the output voltage, the novel LED color temperature lamp is free of stroboflash, low in noise, low in ripple wave and limited in load power, and can be matched with a lamp for adjusting brightness and color temperature simultaneously.

Description

A voltage-adjustable phase-cut dimming power supply

technical field

The invention relates to the field of phase-cut dimming power supplies, in particular to a voltage-adjusted phase-cut dimming power supply.

Background technique

Most of the existing phase-cut dimming power supplies are PWM output. The disadvantage of PWM output is that the dimming frequency within 3.2KHz will have stroboscopic and noise problems, and the dimming frequency within 3.2KHz-20KHz will also have noise problems. , At present, it is rarely possible to do more than 20KHz, and even if it can do it, the loss is large, and it is difficult to handle in terms of protection and dimming effects; in addition, a new type of LED color temperature lamp has appeared on the market, and the brightness and color temperature can be changed at the same time. LED lamp, this kind of LED lamp can only realize the simultaneous change of brightness and color temperature by adjusting the voltage, and the power supply output by PWM cannot meet its requirements. There are also some thyristor dimming power supplies on the market that adjust power to achieve dimming. This thyristor dimming power supply has disadvantages such as high ripple voltage, stroboscopic, low efficiency, and load power limitation.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention proposes a thyristor dimming power supply with adjustable output voltage, no stroboscopic, low ripple and no load power limitation.

An embodiment of the present invention adopts a technical solution to solve the technical problem: a voltage-adjusted phase-cut dimming power supply, comprising a phase-cut dimmer that can be connected to an external power supply, and a phase-cut dimmer connected to the phase-cut dimmer The voltage-adjustable phase-cut dimming power supply connected to the output end of the voltage-adjustable phase-cut dimming power supply can be connected to the lamp, and the voltage-adjustable phase-cut dimming power supply includes an electromagnetic filter circuit, a rectifier and a rectifier which are electrically connected in sequence. A circuit, a power conversion circuit, a transformer, and a rectification filter circuit, further comprising a phase-cut dimming signal conversion circuit, a first optocoupler, a dimming signal conversion circuit, and a voltage comparison control circuit electrically connected to the output end of the electromagnetic filter circuit in sequence circuit, a second optocoupler and a PWM control circuit, the output end of the PWM control circuit is electrically connected to the power conversion circuit, and further includes a voltage sampling circuit that is electrically connected to the output end of the rectification filter circuit and the voltage comparison control circuit respectively The input end of the electromagnetic filter circuit is electrically connected to the output end of the phase-cut dimmer, and the output end of the rectification filter circuit can be electrically connected to the lamp.

The voltage-adjusted phase-cut dimming power supply further includes a PFC control circuit and a PFC circuit, and the PFC circuit is respectively electrically connected to the PFC control circuit, the output end of the rectifier circuit and the input end of the power conversion circuit.

The beneficial effects of the present invention are as follows: a voltage-adjusted phase-cut dimming power supply, comprising an electromagnetic filter circuit, a rectifier circuit, a power conversion circuit, a transformer and a rectifier filter circuit electrically connected in sequence, and also includes an output end connected to the electromagnetic filter circuit in sequence. The phase-cut dimming signal conversion circuit, the first optocoupler, the dimming signal conversion circuit, the voltage comparison control circuit, the second optocoupler and the PWM control circuit are electrically connected, and the output end of the PWM control circuit is electrically connected with the power conversion circuit, It also includes a voltage sampling circuit electrically connected to the output end of the rectification filter circuit and the voltage comparison control circuit, the input end of the electromagnetic filter circuit is electrically connected to the output end of the phase-cut dimmer, and the output end of the rectifier filter circuit can be connected to the lamp power supply. Connection; by adjusting the output voltage, it can achieve no flicker, low noise, low ripple, no load power limit, and can match the new LED color temperature lamp that can adjust brightness and color temperature at the same time.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is the application scene of the present invention;

FIG. 2 is a schematic diagram of the principle structure of the present invention.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the description of the present invention, a plurality of meanings means two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless otherwise clearly defined, words such as "arrangement", "installation" and "connection" should be understood in a broad sense, for example, it may be directly connected or indirectly connected through an intermediate medium; it may be a fixed connection, or It can be a detachable connection or an integral molding; it can be a mechanical connection; it can be a communication between two elements or an interaction relationship between the two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solutions.

Referring to FIG. 1 to FIG. 2 , a voltage-adjusted phase-cut dimming power supply includes a phase-cut dimmer 101 that can be connected to an external power source and a voltage-adjusted dimmer connected to an output end of the phase-cut dimmer 101 The phase dimming power supply 102, the voltage-adjusting phase-cut dimming power supply 102 can be connected to the lamp 103, and the voltage-adjusting phase-cutting dimming power supply 102 includes an electromagnetic filter circuit 1, a rectifier circuit 2, a power The conversion circuit 3 , the transformer 4 and the rectification filter circuit 5 also include a phase-cut dimming signal conversion circuit 6 , a first optocoupler 7 , and a dimming signal conversion circuit 8 electrically connected to the output end of the electromagnetic filter circuit 1 in sequence. , a voltage comparison control circuit 9, a second optocoupler 10 and a PWM control circuit 11, the output end of the PWM control circuit 11 is electrically connected to the power conversion circuit 2, and also includes the output end of the rectifier filter circuit 5 and the The voltage sampling circuit 12 is electrically connected to the voltage comparison control circuit 9, the input terminal of the electromagnetic filter circuit 1 is electrically connected to the output terminal of the phase-cut dimmer 101, and the output terminal of the rectifier filter circuit 5 can be electrically connected to the lamp 103. connect.

The voltage-adjusted phase-cut dimming power supply further includes a PFC control circuit 13 and a PFC circuit 14, and the PFC circuit 14 is electrically connected to the PFC control circuit 13, the output end of the rectifier circuit 2, and the input end of the power conversion circuit 3, respectively. connect.

As shown in FIG. 1 , the input end of the voltage-adjustable phase-cut dimming power supply 102 of the present invention is connected to the phase-cut dimmer 101 , and the output end of the voltage-adjustable phase-cut dimming power supply 102 is connected to the lamp 103 ; The output voltage of the voltage-adjustable phase-cut dimming power supply 102 changes accordingly, and the brightness of the lamp 103 also changes accordingly. If the lamp 103 is a new color temperature LED lamp, the brightness and color temperature change simultaneously.

As shown in FIG. 2 , the voltage-adjusted phase-cut dimming power supply 102 of the present invention receives the alternating current that is phase-cut by the phase-cut dimmer 101 , and inputs it to the electromagnetic filter circuit 1 to filter out electromagnetic interference, and then inputs it to the rectifier circuit 2 for rectification. , and then input to the PFC circuit 14 for power factor correction and boost into DC power to supply power to the power conversion circuit 3. The PFC control circuit 13 controls the PFC circuit 14 to achieve stable output DC power to the power conversion circuit 3. The power conversion circuit 3 and the transformer 4 is converted into the voltage we need to output, and then rectified and filtered by the rectifier filter circuit 5 to obtain the required stable DC voltage and output to the lamp 103, the PWM control circuit 11 controls the power conversion circuit 3 to make it work stably; the other side passes through the electromagnetic filter circuit. 1. The filtered alternating current is input to the phase-cut dimming signal conversion circuit 6, and the phase-cut dimming signal conversion circuit 6 converts the phase-cut alternating current signal into a PWM signal, which is transmitted to the first optocoupler 7 and transmitted to the dimming signal conversion circuit 8, The dimming signal conversion circuit 8 converts the PWM signal into a reference voltage and inputs it to the voltage comparison control circuit 9. At the same time, the voltage sampling circuit 12 collects the voltage signal at the output end of the voltage-adjusted phase-cut dimming power supply 102, and then reduces the voltage and inputs it to the voltage The comparison control circuit 9 compares the reference voltage signal output by the dimming signal conversion circuit 8. When the voltage comparison control circuit 9 compares the two signals to be different, the voltage comparison control circuit 9 outputs a control signal to the second optocoupler 10. The two optocouplers 10 then transmit the control signal to the PWM control circuit 11 , and the PWM control circuit 11 adjusts the outputs of the power conversion circuit 3 and the transformer 4 to achieve a stable output.

When the phase-cut dimmer 101 is adjusted to change the conduction phase width of the alternating current, the conduction phase width of the alternating current input to the phase-cut dimming signal conversion circuit 6 also changes. At this time, the phase-cut dimming signal conversion circuit 6 The pulse width of the converted output PWM signal also changes, and the PWM signal with the changed pulse width is transmitted to the dimming signal conversion circuit 8 through the first optocoupler 7, so the reference voltage output by the dimming signal conversion circuit 8 also changes and is input to the dimming signal conversion circuit 8. The voltage comparison control circuit 9, at this time, the voltage comparison control circuit 9 sends out an adjustment signal, which is transmitted to the PWM control circuit 11 through the second optocoupler 10, and the PWM control circuit 11 changes the output of the power conversion circuit 3 and the transformer 4, and then rectifies and filters the output. After the circuit 5, the output voltage changes, so that the brightness and color temperature of the lamp 103 can be adjusted. Under normal circumstances, when the phase-cut dimmer 101 is adjusted to narrow the AC conduction phase width, the output voltage of the voltage-adjusted phase-cut dimming power supply 102 decreases; on the contrary, when the AC conduction phase width becomes wider, the voltage-adjusted phase-cut The output voltage of the dimming power supply 102 is increased; by adjusting the output voltage, it can achieve no stroboscopic, low noise, low ripple, no load power limit, and can match the new LED color temperature lamp that can adjust brightness and color temperature at the same time.

In the present invention, the same effect can be achieved without using the PFC circuit 14 and the PFC control circuit 13, but the power factor of such an embodiment is relatively low, and the embodiment without the PFC circuit 14 and the PFC control circuit 13 should also be regarded as It is within the protection scope of the patent of the present invention.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can also make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications and substitutions are included in the claims of the present application. In the range.

Claims (2)

1. A voltage-regulating phase-cut dimming power supply comprises a phase-cut dimmer (101) capable of being connected with an external power supply and a voltage-regulating phase-cut dimming power supply (102) connected with an output end of the phase-cut dimmer (101), wherein the voltage-regulating phase-cut dimming power supply (102) can be connected with a lamp (103), and is characterized in that: the voltage-regulating phase-cut dimming power supply (102) comprises an electromagnetic filter circuit (1), a rectifying circuit (2), a power conversion circuit (3), a transformer (4) and a rectifying filter circuit (5) which are sequentially and electrically connected, and further comprises a phase-cut dimming signal conversion circuit (6), a first optical coupler (7), a dimming signal conversion circuit (8), a voltage comparison control circuit (9), a second optical coupler (10) and a PWM control circuit (11) which are sequentially and electrically connected with the output end of the electromagnetic filter circuit (1), wherein the output end of the PWM control circuit (11) is electrically connected with the power conversion circuit (2), and further comprises a voltage sampling circuit (12) which is respectively and electrically connected with the output end of the rectifying filter circuit (5) and the voltage comparison control circuit (9), the input end of the electromagnetic filter circuit (1) is electrically connected with the output end of the phase-cut dimmer (101), the output end of the rectifying and filtering circuit (5) can be electrically connected with a lamp (103).

2. A voltage regulated phase cut dimming power supply according to claim 1, wherein: the power conversion circuit further comprises a PFC control circuit (13) and a PFC circuit (14), wherein the PFC circuit (14) is electrically connected with the PFC control circuit (13), the output end of the rectification circuit (2) and the input end of the power conversion circuit (3) respectively.

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