CN111526626A

CN111526626A - Voltage-regulating phase-cut dimming power supply

Info

Publication number: CN111526626A
Application number: CN202010542211.3A
Authority: CN
Inventors: 郑德华; 赵显云
Original assignee: Zhuhai Shengchang Electronics Co ltd
Current assignee: Zhuhai Shengchang Electronics Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2020-08-11

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

Voltage-regulating phase-cut dimming power supply

Technical Field

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

Background

Most of the existing phase-cut dimming power supplies are PWM (pulse-width modulation) output, and the PWM output has the defects that the dimming frequency is within 3.2KHz, so that the stroboflash and noise problems exist, the dimming frequency is within 3.2KHz-20KHz, at present, the dimming frequency can be more than 20KHz, the loss is large even if the dimming frequency can be made, and the protection and dimming effects are difficult to deal with; in addition, a novel LED color temperature lamp appears on the market, the brightness and the color temperature can be changed simultaneously, the LED lamp can only change the brightness and the color temperature simultaneously in a voltage regulation mode, and a power supply output by PWM cannot meet the requirement. The silicon controlled rectifier dimming power supply has the defects of high ripple voltage, stroboflash, low efficiency, load power limitation and the like.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the silicon controlled rectifier dimming power supply which is used for regulating the output voltage, has no stroboflash, low ripple waves and no load power limitation.

The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows: a voltage-regulating phase-cut dimming power supply comprises a phase-cut dimmer connected with an external power supply and a voltage-regulating phase-cut dimming power supply connected with the output end of the phase-cut dimmer, wherein the voltage-regulating phase-cut dimming power supply can be connected with a lamp and comprises an electromagnetic filter circuit, a rectifier circuit, a power conversion circuit, a transformer and a rectifier filter circuit which are sequentially and electrically connected, and further comprises 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 which are sequentially and electrically connected with the output end of the electromagnetic filter circuit, the output end of the PWM control circuit is electrically connected with the power conversion circuit, and the voltage-regulating phase-cut dimming power supply further comprises a voltage sampling circuit which is respectively electrically connected with the output end of the rectifier filter circuit and the voltage comparison control circuit, the input end of the electromagnetic filter circuit is electrically connected with the output end of the phase-cut light modulator, and the output end of the rectification filter circuit can be electrically connected with the lamp.

The voltage-regulating phase-cut dimming power supply further comprises a PFC control circuit and a PFC circuit, and the PFC circuit is electrically connected with the PFC control circuit, the output end of the rectifying circuit and the input end of the power conversion circuit respectively.

The invention has the beneficial effects that: a voltage-regulating type phase-cut dimming power supply 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 first optical coupler, the dimming signal conversion circuit, the voltage comparison control circuit, the second optical coupler and the PWM control 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.

Drawings

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

FIG. 1 is an application scenario of the present invention;

fig. 2 is a schematic structural diagram of the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the present number, and greater than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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.

In the present invention, unless explicitly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.

Referring to fig. 1 to 2, a voltage-regulating phase-cut dimming power supply includes a phase-cut dimmer 101 connectable to an external power supply, and a voltage-regulating phase-cut dimming power supply 102 connected to an output end of the phase-cut dimmer 101, where the voltage-regulating phase-cut dimming power supply 102 is connectable to a lamp 103, the voltage-regulating phase-cut dimming power supply 102 includes an electromagnetic filter circuit 1, a rectifier circuit 2, a power conversion circuit 3, a transformer 4, and a rectification filter circuit 5, which are electrically connected in sequence, and further includes 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 electrically connected in sequence to an output end of the electromagnetic filter circuit 1, an output end of the PWM control circuit 11 is electrically connected to the power conversion circuit 2, and a voltage sampling circuit 12, which is electrically connected to an output end of the rectification filter circuit 5 and the voltage comparison control circuit 9, respectively, the input end of the electromagnetic filter circuit 1 is electrically connected with the output end of the phase-cut light modulator 101, and the output end of the rectifying filter circuit 5 can be electrically connected with the lamp 103.

The voltage-regulating phase-cut dimming power supply 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 rectifying circuit 2 and the input end of the power conversion circuit 3 respectively.

As shown in fig. 1, an input terminal of the voltage-regulating phase-cut dimming power supply 102 of the present invention is connected to the phase-cut dimmer 101, and an output terminal of the voltage-regulating phase-cut dimming power supply 102 is connected to the lamp 103; the phase-cut dimmer 101 is adjusted, the output voltage of the voltage-regulating phase-cut dimming power supply 102 changes along with the output voltage, the brightness of the lamp 103 also changes along with the output voltage, and if the lamp 103 is a novel color temperature LED lamp, the brightness and the color temperature change along with the output voltage.

As shown in fig. 2, the voltage-regulating type phase-cut dimming power supply 102 receives an alternating current phase-cut by the phase-cut dimmer 101, the alternating current is input to the electromagnetic filter circuit 1 to filter electromagnetic interference, then input to the rectifier circuit 2 for rectification on one side, then input to the PFC circuit 14 for power factor correction and boost to a direct current to supply power to the power conversion circuit 3, the PFC control circuit 13 controls the PFC circuit 14 to stably output the direct current to the power conversion circuit 3, the power conversion circuit 3 and the transformer 4 are converted into a voltage required by output, and the voltage-regulating type phase-cut dimming power supply is rectified and filtered by the rectifier filter circuit 5 to obtain a required stable direct current voltage and output the required stable direct current voltage to the lamp 103, and the PWM control circuit 11 controls the power conversion circuit 3; the other side of the alternating current filtered by the electromagnetic filter circuit 1 is input to a phase-cut dimming signal conversion circuit 6, the phase-cut dimming signal conversion circuit 6 converts the phase-cut alternating current signal into a PWM signal, the PWM signal is transmitted to a first optical coupler 7 and is transmitted to a dimming signal conversion circuit 8, the dimming signal conversion circuit 8 converts the PWM signal into a reference voltage and inputs the reference voltage to a voltage comparison control circuit 9, a voltage sampling circuit 12 collects the voltage signal at the output end of a voltage-regulating type phase-cut dimming power supply 102, the voltage signal is reduced and then is input to the voltage comparison control circuit 9 and the reference voltage signal output by the dimming signal conversion circuit 8 for comparison, when the voltage comparison control circuit 9 compares the two signals differently, the voltage comparison control circuit 9 outputs a control signal to a second optical coupler 10, the second optical coupler 10 transmits the control signal to a PWM control circuit 11, and the PWM control circuit 11 adjusts the output of the power conversion circuit 3 and the transformer 4, a stable output is achieved.

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 is also changed, at this time, the pulse width of the PWM signal converted and output by the phase-cut dimming signal conversion circuit 6 is also changed, the PWM signal with the changed pulse width is transmitted to the dimming signal conversion circuit 8 through the first optocoupler 7, so that the reference voltage output by the dimming signal conversion circuit 8 is also changed and input to the voltage comparison control circuit 9, at this time, the voltage comparison control circuit 9 sends out an adjustment signal, the adjustment signal is transmitted to the PWM control circuit 11 through the second optocoupler 10, the PWM control circuit 11 further changes the output of the transformer 4 of the power conversion circuit 3, and the output voltage is changed after passing through the rectification filter circuit 5, thereby adjusting the brightness and the color temperature of the lamp 103. In a conventional case, when the phase-cut dimmer 101 is adjusted to narrow the width of the on-phase of the alternating current, the output voltage of the voltage-regulating type phase-cut dimming power supply 102 is reduced; on the contrary, when the width of the alternating current conducting phase is widened, the output voltage of the voltage-regulating type phase-cut dimming power supply 102 is increased; 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.

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

It is to be understood that the present invention is not limited to the above-described embodiments, and that equivalent modifications and substitutions may be made by those skilled in the art without departing from the spirit of the present invention, and that such equivalent modifications and substitutions are to be included within the scope of the appended claims.

Claims

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.