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2019-09-16

Control Circuit

 

CN Application CN108235526A

Priority 2018-04-03 • Filing 2018-04-03 • Publication 2018-06-29

Abstract

An embodiment of the invention discloses a control circuit, comprising a dimming control unit, a current ring control unit, an auxiliary power supply unit, an output unit, an isolating unit and a switch unit. The auxiliary power supply unit is connected with the current ring control unit; the current ring control unit is connected with the output unit; the isolating unit is connected with the dimming control unit and the current ring control unit; the switch unit is connected with the dimming control unit and the auxiliary power supply unit. The isolating unit and the switch unit are arranged in the control circuit, the dimming control unit and the output unit can be electrically isolated, and operation safety is greatly ensured for a user. In addition, when an output signal of the dimming control unit is too large, the switch unit cuts of power from the auxiliary power supply unit to the current ring control unit, and the output unit also stops operating; power consumption of the output unit is greatly reduced.

CN108235526A

CN Application

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2018-04-03

 

 

Family: CN (1)

Date App/Pub Number Status

2018-04-03 CN 201810286347

2018-06-29 CN108235526A Application

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Description

FIELD

[0001] The present invention relates to the field of LED driving power supply technology, particularly to a control circuit.

Background technique

[0002] LED driving power supply means for converting the power supply voltage for a specific current to drive the LED light power converter.

[0003] In LH) driving power applied, the normal output of the dimming circuit is not isolated, alone discrete element connected to the output terminal of the dimming input, and do not effect the true sense of security.

[0004] When the output voltage is high, if an element between the dimmer and an output damaged, the high voltage output may he went to a large dimming input. Dimming port is where people often have the opportunity to come into contact with, when he went to high voltage output of the dimmer end, if people come into contact with the dimmer end, it might cause injury.

SUMMARY

Example embodiments provide a control circuit for improving LH) driving safety power [0005] of the present invention.

[0006] The present invention proposes a control circuit comprising a dimming control unit, a current loop control unit, the auxiliary power supply unit and an output unit; the auxiliary power unit and the control unit is connected to the current loop, the current loop control unit the output unit is connected; said control circuit further comprises:

[0007] The isolation unit, said isolation unit respectively connected to the dimming control unit and the current loop control unit is connected, for the dimming control unit and the control unit is electrically isolated from the current loop, and the dimming signal output unit outputs a dimming control to the current loop control unit; and

[0008] a switching unit, the switching unit respectively the dimming control unit and the auxiliary power supply unit is electrically isolated from the dimming control unit and the auxiliary power supply unit is connected to, and in the dimming cutting the auxiliary power supply unit to said current control unit when loop current value of the output signal of the control unit is greater than a predetermined current threshold.

[0009] which is a further aspect, the isolation unit comprises a first photocoupler and inverting amplifier, a first input terminal of the photocoupler connected to the control unit of the light modulation, said first photocoupler the output of the inverting amplifier is connected to the input of the inverting amplifier output connected to the current loop control unit.

[0010] which is a further aspect, the isolation between a first limiting resistor unit and the dimming control unit is provided.

[0011] which is a further technical solution, the second switching unit comprises a switch and a photo coupler, a second input terminal of the input terminal of the photocoupler is connected to the switch, the second photocoupler an output terminal of the power supply terminal of the auxiliary power supply unit is connected to the switch control terminal is connected to the tube dimming control unit, the switch is connected to the input end of the tube is a voltage source, said output switch tube grounded.

[0012] which is a further aspect, the switch unit further comprises a diode, the cathode of the diode is connected to the dimming control unit, a control terminal of the diode cathode is connected to the switch.

[0013] which is a further aspect, the switch unit further comprises voltage dividing resistors, the dividing resistor connected at one end to the negative electrode of the diode, the other end grounded.

[0014] which is a further aspect, the switch unit further comprises a filter capacitor, said filter capacitor and one end of the diode cathode is connected to ground.

[0015] which is a further aspect, the switch is a transistor or M0S tube.

[0016] which is a further technical solution, the tube through the switch input and the pull-up resistor connected to an upper voltage source.

[0017] which is a further aspect of the switching unit provided between the light modulation control unit has a second current limiting resistor.

[0018] By applying the technical solution of the present invention, a spacer is still single Wu and switch unit Wu in the control circuit, the spacer is still units are connected to a dimming control unit and a current loop control unit, a switch unit, respectively dimming control unit and an auxiliary power supply unit is connected. Through the isolation unit and the switch unit enables the dimming control unit and electrically isolated from the output unit, greatly ensuring operational safety of the user. Then, when the output signal of the dimming control unit is too large, the switching unit will cut off the power supply unit to the secondary current loop control unit, the output unit is also stopped and thus, greatly reduces the power consumption of the output unit.

BRIEF DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the present embodiment of the invention, briefly describes the accompanying drawings required for describing the embodiments used in the following embodiments will be apparent in the following description of the accompanying drawings show some embodiments of the present invention, for ordinary skill in the art, without creative efforts, you can obtain other drawings based on these drawings.

[0020] FIG. 1 is a schematic block diagram of a control circuit provided by the embodiments of the present invention.

[0021] A control circuit diagram of the circuit of FIG. 2 according to the proposed embodiment of the present invention.

[0022] reference numerals

[0023] 10, the dimming control unit; 20, isolation unit; 30, a switch unit; 40, a current loop control unit; 50, an auxiliary power supply unit; 60, an output unit.

detailed description

[0024] conjunction with the following drawings of the present invention embodiments, embodiments of the technical solution will be clearly and completely described in, the accompanying drawings in which like numerals represent like components assembly. Obviously, the embodiments described below are merely part of embodiments of the present invention rather than all embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art to make all other embodiments without creative work obtained by, it falls within the scope of the present invention.

[0025] It should be appreciated that, when used in this specification and the appended claims, the terms "comprises" and "comprising" indicates that the described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components and / or the presence or addition of collection.

[0026] It should be further understood that the terms used in the specification of the embodiment in the present invention, this embodiment merely embodiments and are not intended to limit the embodiments of the present invention for the purpose of describing particular embodiments. Examples The specification and attached claims In the present invention, as the book claims, unless the context clearly dictates otherwise, otherwise, "a," "an," and the singular forms of "the" are intended to include the plural forms.

[0027] Referring to Figure 1, a schematic block diagram of a control circuit according to the present invention, it is proposed embodiment, the control circuit is applied to the LED driving power supply. As shown, the control circuit includes a dimming control unit 10, a current loop control unit 40, the auxiliary power supply unit 50, an output unit 60, separator unit 20 and a switch unit 30. It describes the major components are as follows:

[0028] The dimming control unit 10 is for the user to dimming operation member, a dimming control unit 10 the user operates the dimming control unit 10 generates a corresponding current loop control unit 40 sends an output signal, a current loop control unit 40 output unit 60 to regulate accordingly the output signal of the dimming control unit 10. The auxiliary power supply unit 50 is connected to the current control loop means 40, 40 by the auxiliary power supply unit 50 current loop control unit. Current loop control unit 40 is connected to the output unit 60, 40 controls the output unit 60 by the output current loop control unit.

controls the output unit 60 by the output current loop control unit.

[0029] Example embodiments of the present invention, the control circuit further includes means 2〇 isolation, isolation unit 20 are connected to the dimming control unit 10 and a current loop control unit 40. In one aspect, the isolation unit 2〇 for dimming control unit 10 and the current loop is electrically isolated from the control unit 40, so that the high voltage output terminal can not flows into the dimming control unit 1 billion, greatly ensuring the operational safety of the user. On the other hand, for further isolation unit 20 outputs the dimming signal outputted 1〇 dimming control unit to the current loop control unit 40, ensures that the dimming control unit 40 1〇 precise regulation of the current loop control unit.

[0030] Example embodiments of the present invention, the control circuit further includes a switching unit 3〇, 3〇 switching unit connected to the dimming control unit 10 and an auxiliary power supply unit 50, respectively. In one aspect, the switching unit 3〇 for the dimming control unit 10 is electrically isolated from the auxiliary power unit 50, so that the high voltage output terminal can not flows into the dimming control unit 1 billion, greatly ensuring the operational safety of the user. On the other hand, the power supply unit 50 off the auxiliary current supply unit 40 of the control loop when the current value of the output signal of the dimming control unit 10 is greater than a predetermined current threshold. Is large, the current output correspondingly increases, power consumption will be high at the output of the output signal of the dimming control unit 10, in this case, the switching unit 3〇 supplementary power unit 5〇 off current loop control unit power supply 40, so that the current loop control unit 40 stops, whereby the output unit 60 stops operating, greatly reduces the power consumption of the output unit 60.

[0031] The technical solution according to the present embodiment by applying the set 20 and 20 are respectively connected to the dimming control unit 10 and a current loop control unit 40 isolation unit switch unit 30, the isolation unit in the control circuit, respectively, and the modulation switching unit 3〇 light control unit 10 and an auxiliary power supply unit 50 is connected. The dimming control unit 10 is isolated from the output unit 60 and a switching unit 20, electrical isolation can be achieved by unit 30, to ensure the safe operation greatly user. Then, when the output signal 1〇 dimming control unit is too large, the switching unit 30 will cut off the auxiliary power unit 50, the power supply current loop control unit 40, thereby the output unit 60 stops operating, greatly reduces the output unit 60 power consumption.

[0032] Referring to Figure 2, which is a circuit diagram of a method of controlling a circuit according to an embodiment of the present invention, seen from the drawing, the isolation unit 20 includes a first photocoupler U303, and inverting amplifier IC202, a first input of the photocoupler U303 end of the dimming control unit 10 is connected to the output terminal of the first photocoupler U303 and the input terminal of inverting amplifier IC202 is connected to the output terminal of the amplifier IC202 and the reverse current loop control unit 40 is connected. The dimming control unit 10 electrically isolated from the current loop control unit 40 first photocoupler U3〇3 may be accomplished by, but by the inverting amplifier IC2〇2 the modulated output light signal output from the control unit 10 to the control unit 40 is a current loop .

[0033] Further, switch unit 30 includes a second photocoupler U301, and switch Q3〇l. Input terminal and the input terminal of the switch Q301 of the second photocoupler U301 is connected to the output terminal of the power supply terminal of the second photocoupler U301, the auxiliary power supply unit 50 is connected. The switch Q301 is the control terminal of the dimming control unit 10 is connected, the input terminal of the switch Q301 is connected to a voltage source, the output of the switch Q301 is grounded. Specifically, an input terminal, a switch Q3〇l by pull-up resistor R301 is connected to a voltage source. In this embodiment, the transistors Q301 M0S a particular tube, or in other embodiments, the switch may be a transistor Q301.

[0034] Incidentally, the collector of its input transistor, an output transistor its emitter terminal, a control terminal for the transistor base.

Input [0035] M0S its drain tube, its output end of the tube M0S source, the control terminal is a gate M0S tube.

[0036] When the current value of the output signal of the dimming control unit 10 is below a predetermined current threshold, the switch Q301 in a conducting state, the voltage of the voltage source is down, this time in a second photocoupler U301 off open state, the auxiliary power supply unit 50 supplies power to the normal loop current control unit 40; the current value when the output signal of the dimming control unit 10 is greater than a predetermined current threshold value, the switch Q301 is in an OFF state, when the second photocoupler in a conducting state, U301, U301 second photocoupler voltage supply terminal of the auxiliary power supply unit 50 is pulled low, enabling the power supply unit 50 off the auxiliary current supply unit 40 of the control loop.

[0037] Further, switch unit 30 further comprises a diode D305, resistor R302 and a voltage dividing filter capacitor C301. The anode of the diode D305 dimming control unit 10 is connected, and a negative control terminal of the switch Q301 is connected to the diode D305. Diode D305 is possible to realize the dimming control unit 10 and the auxiliary power supply unit 50 between the unidirectional flow of current.

[0038] R302- dividing resistor connected to the negative terminal of the diode D305, resistor R302 dividing the other end grounded, the voltage dividing resistor R302 can be reduced tube voltage control terminal of a switch Q301.

[0039] C301- filter capacitor terminal connected to the negative and diode D305, the capacitor C301 other end of the filter, the filter capacitor C301 is able to absorb high frequency noise in the circuit, to improve stability of the circuit.

[0040] Also in the spacer 10 between the unit 20 and is provided with a first dimming control unit limiting resistor R304, is provided between the switching unit 30 and the dimming control unit 10 has a second current limiting resistor R307, a first flow restrictor a second resistor R304 and a resistor R307 limiting current ripple can be reduced to improve the stability of the circuit.

[0041] Note that, the dimming control unit 1 billion, current loop control unit 40, the auxiliary power supply unit 50 and an output unit 60 to the person skilled in the art, this is not repeated.

[0042] In the above embodiment, the description of the various embodiments have different emphases, not described in detail a portion of the embodiments, reference may be described in other embodiments.

[0043] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, yet these modifications and variations of the present invention fall within the claims of the invention and the scope of equivalents thereof, the present invention intends to include these modifications and variations.

[0044] The above specific embodiments of the present invention, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed, other readily figured effective modification or replacement, such modifications or replacements shall fall within the scope of the present invention. Accordingly, the scope of the present invention should be defined by the scope of the claims.

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Priority And Related Applications

Priority Applications (1)

ApplicationPriority dateFiling dateTitle

CN 201810286347 2018-04-032018-04-03Control circuit

Applications Claiming Priority (1)

ApplicationFiling dateTitle

CN 201810286347 2018-04-03Control circuit

Legal Events

DateCodeTitleDescription

2018-06-29PB01

2018-07-24SE01


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