CN220067733U - Dimming circuit and light control device - Google Patents

Abstract

The present utility model relates to a dimming circuit and a light control apparatus. The dimming circuit includes: a control circuit and a voltage acquisition circuit; one end of the voltage acquisition circuit is connected with one end of the control circuit, and the other end of the voltage acquisition circuit and the other end of the control circuit are connected with the light source module to be dimmed; the voltage acquisition circuit acquires the voltage of the light source module under the condition that the control circuit adjusts the light source module. The dimming circuit can be used for acquiring the voltage on the light source module and accurately dimming the light source module.

Description

Dimming circuit and light control device

Technical Field

The utility model relates to the technical field of lamplight, in particular to a dimming circuit and lamplight control equipment.

Background

With the development of light emitting diode (Light Emitting Diode, LED) technology, the application of LEDs in the lighting field is continuously expanding and in depth. The LED comprises a plurality of light source modules, and the color temperature of the LED is adjusted by dimming the light source modules.

In the process of adjusting the color temperature of the light source module, the light adjusting circuit outputs set driving current or driving power to the light source module so as to realize the light adjustment of the light source module. However, the dimming circuit in the related art has difficulty in knowing the voltage on the light source module, resulting in difficulty in accurately dimming the light source module.

Disclosure of Invention

Accordingly, it is desirable to provide a dimming circuit and a light control device that can learn the voltage on the light source module and accurately dim the light source module.

In a first aspect, the present utility model provides a dimming circuit comprising: a control circuit and a voltage acquisition circuit; one end of the voltage acquisition circuit is connected with one end of the control circuit, and the other end of the voltage acquisition circuit and the other end of the control circuit are connected with the light source module to be dimmed;

the voltage acquisition circuit acquires the voltage of the light source module under the condition that the control circuit adjusts the light source module.

In one embodiment, the voltage acquisition circuit comprises a voltage acquisition device and a voltage amplification circuit; the first end of the voltage collector is connected with the light source module, and the second end of the voltage collector is connected with the control circuit through the voltage amplifying circuit.

In one embodiment, the voltage collector comprises a first resistor and a second resistor;

the first resistor and the second resistor are connected in parallel, the first end of the first resistor is connected with the light source module and the voltage amplifying circuit respectively, the first end of the second resistor is connected with the light source module and the voltage amplifying circuit respectively, and the second end of the first resistor and the second end of the second resistor are grounded.

In one embodiment, the voltage amplifying circuit comprises a third resistor, a fourth resistor and an operational amplifier;

the first end of the third resistor is connected with the control circuit, the first end of the fourth resistor is grounded, the second end of the third resistor and the second end of the fourth resistor are both connected with the negative input end of the operational amplifier, the positive input end of the operational amplifier is respectively connected with the first end of the first resistor and the first end of the second resistor, and the output end of the operational amplifier is connected with the control circuit.

In one embodiment, the control circuit includes a dimming processing circuit, a current control circuit, and a voltage control circuit;

the dimming processing circuit is respectively connected with the first end of the voltage control circuit and the first end of the current control circuit, the second end of the voltage control circuit and the second end of the current control circuit are both connected with the light source module, and the third end of the current control circuit is connected with the voltage acquisition circuit.

In one embodiment, the current control circuit includes a comparison circuit and a first switching circuit;

the first end of the comparison circuit is connected with the first ends of the dimming processing circuit and the voltage acquisition circuit respectively, the second end of the comparison circuit is connected with the first end of the first switch circuit, and the second end of the first switch circuit is connected with the first end of the light source module and the second end of the voltage acquisition circuit respectively.

In one embodiment, the comparison circuit comprises a sliding resistor and an operational comparator, and the first switching circuit comprises a first transistor;

the positive input end of the operation comparator is connected with the dimming processing circuit through the sliding resistor, the negative input end of the operation comparator is connected with the first end of the voltage acquisition circuit, the output end of the operation comparator is connected with the grid electrode of the first transistor, the source electrode of the first transistor is connected with the second end of the voltage acquisition circuit, and the drain electrode of the first transistor is connected with the first end of the light source module.

In one embodiment, the voltage control circuit includes a second switching circuit and a voltage compensation circuit;

the first end of the second switch circuit is connected with the dimming processing circuit, the second end of the second switch circuit is connected with the first end of the voltage compensation circuit, and the second end of the voltage compensation circuit is connected with the second end of the light source module.

In one embodiment, the second switching circuit includes a second transistor, a fifth resistor, and a sixth resistor;

the source electrode of the second transistor is connected with the voltage compensation circuit, the grid electrode of the second transistor is respectively connected with the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is connected with the dimming processing circuit, and the second end of the sixth resistor and the drain electrode of the second transistor are grounded.

In one embodiment, the voltage compensation circuit includes a voltage regulator, a seventh resistor, and an eighth resistor;

the first end of the voltage regulator is connected with the second end of the light source module, the second end of the voltage regulator is respectively connected with the first end of the seventh resistor and the first end of the eighth resistor, the second end of the seventh resistor is connected with the dimming processing circuit, and the second end of the eighth resistor is connected with the source electrode of the second transistor.

In a second aspect, the present utility model provides a light control apparatus comprising the contents of any one of the dimming circuits of the first aspect.

The above-mentioned dimmer circuit and light control equipment, this dimmer circuit includes: a control circuit and a voltage acquisition circuit; one end of the voltage acquisition circuit is connected with one end of the control circuit, and the other end of the voltage acquisition circuit and the other end of the control circuit are connected with the light source module to be dimmed; the voltage acquisition circuit acquires the voltage of the light source module under the condition that the control circuit adjusts the light source module. The dimming circuit is provided with the voltage acquisition circuit connected with the light source module, so that the voltage on the light source module can be accurately acquired in the dimming process of the light source module by the control circuit, and the light source module can be accurately dimmed.

Drawings

FIG. 1 is a schematic diagram of a dimming circuit in one embodiment;

FIG. 2 is a schematic circuit diagram of a voltage acquisition circuit in one embodiment;

FIG. 3 is a schematic circuit diagram of a voltage collector in one embodiment;

FIG. 4 is a schematic diagram of another embodiment of a voltage amplifying circuit;

FIG. 5 is a schematic circuit diagram of a control circuit in one embodiment;

FIG. 6 is a schematic circuit diagram of a current control circuit in one embodiment;

FIG. 7 is a schematic circuit diagram of a comparison circuit in one embodiment;

FIG. 8 is a schematic circuit diagram of a comparison circuit in one embodiment;

FIG. 9 is a schematic circuit diagram of a comparison circuit in one embodiment;

FIG. 10 is a circuit schematic of a comparison circuit in one embodiment.

Reference numerals illustrate:

10: a dimming circuit; 11: a control circuit;

111: a dimming processing circuit; 112: a current control circuit;

1121: a comparison circuit; RV: a sliding resistor;

OPA2: an arithmetic comparator; m1: a first transistor;

1122: a first switching circuit; 113: a voltage control circuit;

1131: a second switching circuit; m2: a second transistor;

r5: a fifth resistor; r6: a sixth resistor;

1132: a voltage compensation circuit; 1133: a voltage regulator;

r7: a seventh resistor; r8: an eighth resistor;

12: a voltage acquisition circuit; 121: a voltage collector;

r1: a first resistor; r2: a second resistor;

122: a voltage amplifying circuit; r3: a third resistor;

r4: a fourth resistor; OPA1: an operational amplifier;

13: a light source module.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the term "comprising" and any variations thereof in the description of the utility model and the claims and the description of the figures above is intended to cover a non-exclusive inclusion.

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the utility model. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.

In one embodiment, as shown in fig. 1, fig. 1 shows a schematic circuit diagram of a dimming circuit, and the dimming circuit 10 includes: a control circuit 11 and a voltage acquisition circuit 12; one end of the voltage acquisition circuit 12 is connected with one end of the control circuit 11, and the other end of the voltage acquisition circuit 12 and the other end of the control circuit are connected with the light source module 13 to be dimmed; the voltage acquisition circuit 12 acquires the voltage of the light source module 13 in the case where the control circuit 11 dims the light source module 13.

Typically, the light source module 13 may include a plurality of LED lamp bead groups, and each LED lamp bead group may include a plurality of LED lamp beads. The color of each LED bead set may be different. Because the rated voltage of each color of the LED lamp bead group is different in the packaging production process, when dimming is performed on the LED lamp bead groups with different colors, the driving current or driving power output by the control circuit 11 is different.

The plurality of LED lamp bead groups can be connected in parallel with the control circuit 11 after being connected in series, namely, the control circuit 11 can output set driving current or driving power to the whole light source module 13 so as to realize dimming of the light source module 13. Or, each LED lamp bead group is connected in series with the control circuit through a switch, and the plurality of LED lamp bead groups are connected in parallel, namely, the control circuit 13 can output set driving current or driving power to any one or a plurality of LED lamp bead groups in the light source module 13 according to the on or off state of the switch, so that the dimming of part of LED lamp bead groups in the light source module 13 is realized.

When the control circuit 11 outputs a set driving current or driving power to the light source module 13, only the output driving current or driving power can be obtained. When current flows through the light source module, voltage drop is generated at two ends of the light source module 13, current loss is caused, and voltage on the light source module 13 is difficult to know, so that light modulation of the light source module 13 is difficult to accurately perform. Therefore, the voltage acquisition circuit 12 is added on the basis of the existing control circuit 11, and the control circuit 11 outputs driving current or driving power to the light source module 13, so that the voltage of the light source module 13 is acquired through the voltage acquisition circuit 12 in the dimming process of the light source module 13, so that the voltage on the light source module 13 in the dimming process is accurately acquired.

The voltage acquisition circuit 12 may be a voltage sensor, through which the voltage at both sides of the light source module 13 can be directly measured, or the voltage sensor 12 may also be a current sensor, through which the current flowing through both sides of the light source module 13 is measured, and the voltage at both sides of the light source module 13 is determined according to the current and the rated resistance of the light source module 13, or the voltage acquisition circuit may also be a circuit structure composed of a plurality of electronic components. The control circuit 11 may be an analog circuit or a digital circuit. The control elements in the control circuit can be but not limited to micro control units (Microcontroller Unit; MCU), central processing units (central processing unit, CPU), digital signal processors (digital signal processing, DSP), programmable logic devices (Field Programmable Gate Array, FPGA), single-chip microcomputer and other control devices.

The dimming circuit comprises a control circuit and a voltage acquisition circuit; one end of the voltage acquisition circuit is connected with the control circuit, and the other end of the voltage acquisition circuit is connected with the light source module to be dimmed; the voltage acquisition circuit acquires the voltage of the light source module under the condition that the control circuit adjusts the light source module. The dimming circuit is provided with the voltage acquisition circuit connected with the light source module, so that the voltage on the light source module can be accurately acquired in the dimming process of the light source module by the control circuit, and the light source module can be accurately dimmed.

In one embodiment, as shown in fig. 2, fig. 2 shows a schematic circuit diagram of a voltage acquisition circuit, where the voltage acquisition circuit 12 includes a voltage acquisition device 121 and a voltage amplification circuit 122; the first end of the voltage collector 121 is connected with the light source module 13, and the second end of the voltage collector 121 is connected with the control circuit 11 through the voltage amplifying circuit 122.

In this embodiment, the circuit structure inside the voltage acquisition circuit 12 is described, the first end of the voltage collector 121 in the voltage acquisition circuit 12 is connected with the light source module 13, and after the voltage collector 121 collects the voltage of the light source module 13, the voltage variation range on the light source module 13 collected by the voltage collector 121 is larger due to the different driving current or driving power output by the control circuit 11, and when the voltage is smaller, the voltage flowing through the light source module 13 cannot be obtained. Therefore, the voltage on the light source module 13 acquired by the voltage acquisition unit 121 needs to be amplified by the voltage amplification circuit 122, so as to accurately acquire the voltage on the light source module 13. For example, the voltage collector 121 may be composed of two parallel resistors, wherein first ends of the two parallel resistors are respectively connected with the light source module 13 and the voltage amplifying circuit 122, and second ends of the two parallel resistors are grounded, so that the current flowing through the two parallel resistors is the current flowing through the light source module 13, and the product of the current and the rated resistance of the light source module 13 is the voltage on the light source module 13. The voltage amplifying circuit 122 may be a transistor amplifying circuit, a field effect transistor amplifying circuit, or a voltage amplifying circuit formed by an operational amplifier.

The voltage acquisition circuit comprises a voltage acquisition device and a voltage amplification circuit; the first end of the voltage collector is connected with the light source module, and the second end of the voltage collector is connected with the control circuit through the voltage amplifying circuit. Through setting up voltage amplification circuit in this voltage acquisition circuit, can enlarge the voltage of the light source module that voltage acquisition ware gathered, avoided the too little unable condition of acquireing of light source module voltage, can learn the voltage on the light source module more accurately.

In one embodiment, as shown in fig. 3, fig. 3 shows a schematic circuit diagram of a voltage collector, where the voltage collector 121 includes a first resistor R1 and a second resistor R2; the first resistor R1 and the second resistor R2 are connected in parallel, the first end of the first resistor R1 is respectively connected with the light source module 13 and the voltage amplifying circuit 122, the first end of the second resistor R2 is respectively connected with the light source module 13 and the voltage amplifying circuit 122, and the second end of the first resistor R1 and the second end of the second resistor R2 are both grounded.

The first resistor R1 and the second resistor R2 may be carbon film resistors, metal oxide film resistors, synthetic carbon film resistors, fuse resistors, glass glaze resistors, cement resistors, row resistors, chip resistors, fuses, and the like. The materials of the first resistor R1 and the second resistor R2 may be the same or different. The resistances of the first resistor R1 and the second resistor R2 may be the same or different.

In this embodiment, when the control circuit 11 dimmes the light source module 13, the current flows through the first resistor R1 and the second resistor R2 via the light source module 13, the sum of the current flowing through the first resistor R1 and the current flowing through the second resistor R2 is the current flowing through the light source module 13, and the voltage on the light source module 13 can be accurately obtained through the rated resistor of the light source module 13.

The voltage collector comprises a first resistor and a second resistor; the first resistor and the second resistor are connected in parallel, the first end of the first resistor is connected with the light source module and the voltage amplifying circuit respectively, the first end of the second resistor is connected with the light source module and the voltage amplifying circuit respectively, and the second end of the first resistor and the second end of the second resistor are grounded. The voltage collector consists of two parallel resistors, and can accurately acquire the current flowing through the light source module through the current flowing through the first resistor and the second resistor, so that the voltage of the light source module can be accurately determined according to the current flowing through the light source module.

In one embodiment, as shown in fig. 4, fig. 4 shows a schematic circuit diagram of a voltage amplifying circuit, where the voltage amplifying circuit 122 includes a third resistor R3, a fourth resistor R4, and an operational amplifier OPA1; the first end of the third resistor R3 is connected with the control circuit 11, the first end of the fourth resistor R4 is grounded, the second end of the third resistor R3 and the second end of the fourth resistor R4 are both connected with the negative input end of the operational amplifier 1223, the positive input end of the operational amplifier OPA1 is respectively connected with the first end of the first resistor R1 and the first end of the second resistor R2, and the output end of the operational amplifier OPA1 is connected with the control circuit 11.

In this embodiment, the types and materials of the third resistor R3 and the fourth resistor R4 may refer to the first resistor R1 and the second resistor R2, and it should be noted that, according to the ratio of the resistance values of the third resistor R3 and the fourth resistor R4, the amplification factor of the voltage amplifying circuit 122 may be determined, that is, the resistance value of the third resistor R3 is greater than the resistance value of the fourth resistor R4, for example, the resistance value of the third resistor may be 1000 ohms, the resistance value of the fourth resistor R4 may be 200 ohms, and the amplification factor of the voltage amplifying circuit 122 may be 5 times.

The negative input end of the operational amplifier OPA1 is connected with the third resistor R3 and the fourth resistor R4 to input the amplification factor of the voltage of the light source module 13, the positive input end is connected with the first ends of the first resistor R1 and the second resistor R2 to input the collected voltage of the light source module 13, the voltage of the light source module 13 is amplified through the operational amplifier OPA1 according to the amplification factor, and the amplified voltage of the light source module 13 is input into the control circuit 11. The operational amplifier OPA1 may be a low-temperature drift type integrated operational amplifier, a low-power consumption type integrated operational amplifier, a high-input impedance integrated operational amplifier, a high-voltage high-power type integrated operational amplifier, a programmable control type integrated operational amplifier, or the like.

The voltage amplifying circuit comprises a third resistor, a fourth resistor and an operational amplifier; the first end of the third resistor is connected with the control circuit, the first end of the fourth resistor is grounded, the second end of the third resistor and the second end of the fourth resistor are both connected with the negative input end of the operational amplifier, the positive input end of the operational amplifier is respectively connected with the first end of the first resistor and the first end of the second resistor, and the output end of the operational amplifier is connected with the control circuit. The voltage amplifying circuit consists of two resistors and an operational amplifier, the amplification factor of the voltage can be accurately determined through the resistance values of the two resistors, and the voltage can be more accurately amplified by the operational amplifier.

In one embodiment, as shown in fig. 5, fig. 5 shows a circuit schematic of a control circuit, and the control circuit 11 includes a dimming processing circuit 111, a current control circuit 112, and a voltage control circuit 113; the dimming processing circuit 111 is connected to a first end of the voltage control circuit 113 and a first end of the current control circuit 112, respectively, a second end of the voltage control circuit 113 and a second end of the current control circuit 112 are both connected to the light source module 13, and a third end of the current control circuit 112 is connected to the voltage acquisition circuit 12.

Based on the description of the foregoing embodiments, in this embodiment, the connection relationship between the plurality of circuits inside the control circuit 11 and the voltage acquisition circuit 12 is described in detail, the second end of the current control circuit 112 is connected to the first end of the light source module 13, the third end of the current control circuit 112 is connected to the output end of the operational amplifier OPA1 of the voltage amplification circuit 122 in the voltage acquisition circuit 12, and the output end of the operational amplifier OPA1 is also connected to the dimming processing circuit 111, so that the dimming processing circuit 111 can accurately obtain the voltage on the light source module 13 amplified by the operational amplifier OPA1, thereby accurately changing the dimming frequency according to the voltage, and accurately dimming the light source module 13 by the current control circuit 112 and the voltage control circuit 113.

It should be noted that, the current control circuit 112 may dim the light source module 13 alone, the voltage control circuit 113 may dim the light source module 113 alone, or the current control circuit 112 and the voltage control circuit 113 may be combined to dim the light source module 113 at the same time. In this way, when the current control circuit 112 or the voltage control circuit 113 is prevented from malfunctioning, dimming is performed by the other control circuit, and the dimming reliability of the light source module can be improved.

The control circuit comprises a dimming processing circuit, a current control circuit and a voltage control circuit; the dimming processing circuit is respectively connected with the first end of the voltage control circuit and the first end of the current control circuit, the second end of the voltage control circuit and the second end of the current control circuit are both connected with the light source module, and the third end of the current control circuit is connected with the voltage acquisition circuit. The dimming processing circuit in the control circuit is connected with the voltage acquisition circuit, so that the voltage of the light source module acquired by the voltage acquisition circuit can be accurately acquired, and the light source module can be accurately dimmed according to the acquired voltage; meanwhile, in the dimming process, the light source module can be dimmed through the current control circuit, the light source module can be dimmed through the voltage control circuit, the situation that the control circuit fails and cannot be dimmed is avoided, and the dimming reliability of the light source module is improved.

In one embodiment, as shown in fig. 6, fig. 6 shows a schematic circuit diagram of a current control circuit, the current control circuit 112 includes a comparison circuit 1121 and a first switching circuit 1122; the first end of the comparison circuit 1121 is connected to the first ends of the dimming processing circuit 111 and the voltage acquisition circuit 12, respectively, the second end of the comparison circuit 1121 is connected to the first end of the first switch circuit 1122, and the second end of the first switch circuit 1122 is connected to the first end of the light source module 13 and the second end of the voltage acquisition circuit 12, respectively.

In this embodiment, the comparing circuit 1121 is configured to calculate a difference between the voltage on the light source module 13 collected by the voltage collecting circuit 12 and the voltage output by the dimming processing circuit 111, compare the difference with a preset relationship of the preset difference, and determine the on-off state of the first switching circuit 1122 according to the comparison result. When the first switch circuit 1122 is in the on state, the light source module 13 is dimmed; when the first switch circuit 1122 is in the non-conductive state, the dimming process is not performed on the light source module 13.

The first terminal of the comparison circuit 1121 is connected to the output terminal of the operational amplifier OPA1 in the voltage acquisition circuit 12 when connected to the voltage acquisition circuit 12, and the second terminal of the first switch circuit 1122 is connected to the second terminal of the first resistor R1 and the second resistor R2 in the voltage acquisition circuit 12 when connected to the second terminal of the voltage acquisition circuit 12.

The first switching circuit 1122 may be implemented by a switching transistor, for example, a transistor, a MOS transistor, or the like; alternatively, the first switch circuit 1122 may be implemented by a single pole single throw switch, a single pole double throw switch, a single pole multiple throw switch, or the like, or the switch circuit may be implemented by some switch chips.

The current control circuit comprises a comparison circuit and a first switch circuit; the first end of the comparison circuit is connected with the first ends of the dimming processing circuit and the voltage acquisition circuit respectively, the second end of the comparison circuit is connected with the first end of the first switch circuit, and the second end of the first switch circuit is connected with the first end of the light source module and the second end of the voltage acquisition circuit respectively. The comparison circuit in the current control circuit analyzes and compares the voltage of the dimming processing circuit 111 with the collected voltage of the light source module, and can accurately control the on and off of the first switch circuit, so that the light source module can be dimmed accurately.

In one embodiment, as shown in fig. 7, fig. 7 shows a circuit schematic of a comparison circuit, where the comparison circuit 1121 includes a sliding resistor RV and an operational comparator OPA2, and the first switch circuit 1122 includes a first transistor M1; the positive input end of the operation comparator OPA2 is connected with the dimming processing circuit 111 through the sliding resistor RV, the negative input end of the operation comparator OPA2 is connected with the first end of the voltage acquisition circuit 12, the output end of the operation comparator OPA2 is connected with the grid electrode of the first transistor M1, the source electrode of the first transistor M1 is connected with the second end of the voltage acquisition circuit 12, and the drain electrode of the first transistor M1 is connected with the first end of the light source module 13.

The sliding resistor RV adjusts the voltage output from the dimming processing circuit 111 by changing its own resistance. The shape of the sliding resistor RV may include other shapes such as a cylindrical shape, a rectangular parallelepiped shape, and the like; the structure of the sliding resistor RV may include a straight sliding type structure, a rotating type structure, a switch type structure, a locking device type structure, a multi-connection type structure, a multi-turn type structure, a fine tuning type structure, a non-contact type structure, and the like. The sliding resistor RV can be made of various resistance materials such as carbon films, synthetic films, organic conductors, metallic glass glaze, alloy resistance wires and the like. The first end of the sliding resistor RV is connected to the dimming processing circuit 111, and the second end of the sliding resistor RV is connected to the positive input terminal of the operational comparator OPA 2.

The operational comparator OPA2 is an operational amplifier without feedback, the positive input end and the negative input end of the operational comparator OPA2 are both input with analog signals, the output end outputs binary signals, and the binary signals control the on and off of the first switch circuit 1122. The negative input end of the operational comparator OPA2 is connected to the output end of the operational amplifier OPA1 in the voltage acquisition circuit 12, and the output end of the operational comparator OPA2 is connected to the gate of the first transistor M1.

The operation comparator OPA2 outputs a binary signal to control the on/off of the first transistor M1, and when the first transistor M1 is turned on, the light source module 13 is turned on with the first resistor R1 and the second resistor R2 in the voltage acquisition circuit 12; when the first transistor M1 is not turned on, the light source module 13 is not turned on with the first resistor R1 and the second resistor R2, and the higher the frequency of turning on/off the first transistor M1, the higher the dimming brightness of the light source module 13; the lower the frequency, the smaller the dimming brightness of the light source module 13. The first transistor M1 may be a diode, a triode, a field effect transistor, a thyristor, or the like made of various semiconductor materials. It is noted that whether or not the current is passed through the on and off control transistors belongs to a common circuit configuration.

The comparison circuit comprises a sliding resistor and an operation comparator, and the first switch circuit comprises a first transistor; the positive input end of the operation comparator is connected with the dimming processing circuit through the sliding resistor, the negative input end of the operation comparator is connected with the first end of the voltage acquisition circuit, the output end of the operation comparator is connected with the grid electrode of the first transistor, the source electrode of the first transistor is connected with the second end of the voltage acquisition circuit, and the drain electrode of the first transistor is connected with the first end of the light source module. The sliding resistor in the comparison circuit can adjust the signal input by the dimming circuit, the signal can be input into the comparison circuit, the comparison circuit can accurately compare the signal with the voltage of the light source module, and the on and off of the first transistor M1 can be sequentially and accurately controlled, so that the dimming of the light source module can be accurately performed.

In one embodiment, as shown in fig. 8, fig. 8 shows a schematic circuit diagram of a voltage control circuit, where the voltage control circuit 113 includes a second switch circuit 1131 and a voltage compensation circuit 1132; the first end of the second switch circuit 1131 is connected to the dimming processing circuit 111, the second end of the second switch circuit 1131 is connected to the first end of the voltage compensation circuit 1132, and the second end of the voltage compensation circuit 1132 is connected to the second end of the light source module 13.

In this embodiment, the second switch circuit 1131 may be implemented by a switching tube, a mechanical switch, a switching chip, or the like, as in the first switch circuit 1122. The voltage compensation circuit 1132 may be a chip, and when the second switch circuit 1131 is turned on, the voltage compensation circuit 1132 provides a compensation voltage to the light source module 13 to adjust the light of the light source module 13; when the second switch circuit 1131 is not turned on, the voltage compensation circuit 1132 cannot provide the compensation voltage to the light source module 13, and cannot dim the light source module 13.

The voltage control circuit comprises a second switch circuit and a voltage compensation circuit; the first end of the second switch circuit is connected with the dimming processing circuit, the second end of the second switch circuit is connected with the first end of the voltage compensation circuit, and the second end of the voltage compensation circuit is connected with the second end of the light source module. The second switch circuit in the voltage control circuit is turned on and turned off to accurately determine whether the voltage compensation circuit performs voltage compensation on the light source module or not, so that the light source module can be accurately dimmed.

In one embodiment, as shown in fig. 9, fig. 9 shows a circuit schematic of a second switching circuit, where the second switching circuit 1131 includes a second transistor M2, a fifth resistor R5, and a sixth resistor R6; the source of the second transistor M2 is connected to the voltage compensation circuit 1132, the gate of the second transistor M2 is connected to the first end of the fifth resistor R5 and the first end of the sixth resistor R6, the second end of the fifth resistor R5 is connected to the dimming processing circuit 12, and the second end of the sixth resistor R6 and the drain of the second transistor M2 are both grounded.

In the present embodiment, the dimming processing circuit 111 outputs a pwm signal, the second transistor M2 is controlled to be turned on and off by the pwm signal, and when the second transistor M2 is turned on, the pwm signal can be transmitted to the voltage compensation circuit 1132 through the second transistor M2; when the second transistor M2 is not turned on, the pwm signal cannot be transmitted to the voltage compensation circuit 1132 through the second transistor M2.

The second switch circuit comprises a second transistor, a fifth resistor and a sixth resistor; the source electrode of the second transistor is connected with the voltage compensation circuit, the grid electrode of the second transistor is respectively connected with the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is connected with the dimming processing circuit, and the second end of the sixth resistor and the drain electrode of the second transistor are grounded. The light source module can be accurately dimmed by switching on and off the second transistor in the second switching circuit.

In one embodiment, as shown in fig. 10, fig. 10 shows a schematic circuit diagram of a voltage compensation circuit, where the voltage compensation circuit 1132 includes a voltage regulator 1133, a seventh resistor R7, and an eighth resistor R8; the first end of the voltage regulator 1133 is connected to the second end of the light source module 13, the second end of the voltage regulator 1133 is connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8, the second end of the seventh resistor R7 is connected to the dimming processing circuit 111, and the second end of the eighth resistor R8 is connected to the source of the second transistor M2.

In the present embodiment, the eighth resistor R8, the second transistor M2, and the fifth resistor R5 constitute a branch, and the branch is connected in parallel with the seventh resistor R7. The dimming processing circuit 111 outputs a pulse width modulation signal according to the voltage of the light source module 13 collected by the voltage collection circuit 12, converts the pulse width modulation signal into a regulated voltage through the voltage regulator 1133, and performs dimming on the light source module 13 through the regulated voltage, thereby achieving the purpose of dimming.

The voltage compensation circuit comprises a voltage regulator, a seventh resistor and an eighth resistor; the first end of the voltage regulator is connected with the second end of the light source module, the second end of the voltage regulator is respectively connected with the first end of the seventh resistor and the first end of the eighth resistor, the second end of the seventh resistor is connected with the dimming processing circuit, and the second end of the eighth resistor is connected with the source electrode of the second transistor. The voltage regulator in the voltage compensation circuit can convert the signal output by the dimming processing circuit into voltage, and the dimming of the light source module is accurately performed through the voltage.

In one embodiment, a light control apparatus is provided, in which the dimming circuit in any of the above embodiments is provided to achieve dimming of a light source module. When the light source module is stage lighting, the lighting control device can be arranged at the position of the control console. The user adjusts the light of the light source module through the light control equipment. Because the voltage acquisition circuit is added in the light control equipment, the voltage of the light source module in the dimming process can be detected in real time, so that the light source module can be dimmed accurately.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.

Claims (11)

1. A dimming circuit, the dimming circuit comprising: a control circuit and a voltage acquisition circuit; one end of the voltage acquisition circuit is connected with one end of the control circuit, and the other end of the voltage acquisition circuit and the other end of the control circuit are connected with a light source module to be dimmed;

the voltage acquisition circuit acquires the voltage of the light source module under the condition that the control circuit adjusts the light of the light source module.

2. The dimmer circuit of claim 1, wherein the voltage acquisition circuit comprises a voltage acquisition and a voltage amplification circuit; the first end of the voltage collector is connected with the light source module, and the second end of the voltage collector is connected with the control circuit through the voltage amplifying circuit.

3. The dimmer circuit of claim 2, wherein the voltage collector comprises a first resistor and a second resistor;

the first resistor is connected with the second resistor in parallel, the first end of the first resistor is connected with the light source module and the voltage amplifying circuit respectively, the first end of the second resistor is connected with the light source module and the voltage amplifying circuit respectively, and the second end of the first resistor and the second end of the second resistor are grounded.

4. A dimming circuit as claimed in claim 3, wherein the voltage amplifying circuit comprises a third resistor, a fourth resistor and an operational amplifier;

the first end of the third resistor is connected with the control circuit, the first end of the fourth resistor is grounded, the second end of the third resistor and the second end of the fourth resistor are both connected with the negative input end of the operational amplifier, the positive input end of the operational amplifier is respectively connected with the first end of the first resistor and the first end of the second resistor, and the output end of the operational amplifier is connected with the control circuit.

5. A dimming circuit as claimed in any one of claims 1 to 4, wherein the control circuit comprises a dimming processing circuit, a current control circuit and a voltage control circuit;

the dimming processing circuit is respectively connected with the first end of the voltage control circuit and the first end of the current control circuit, the second end of the voltage control circuit and the second end of the current control circuit are both connected with the light source module, and the third end of the current control circuit is connected with the voltage acquisition circuit.

6. The dimmer circuit of claim 5, wherein the current control circuit comprises a comparison circuit and a first switching circuit;

the first end of the comparison circuit is connected with the first ends of the dimming processing circuit and the voltage acquisition circuit respectively, the second end of the comparison circuit is connected with the first end of the first switch circuit, and the second end of the first switch circuit is connected with the first end of the light source module and the second end of the voltage acquisition circuit respectively.

7. The dimming circuit of claim 6, wherein the comparison circuit comprises a sliding resistor and an operational comparator, the first switching circuit comprising a first transistor; the positive input end of the operation comparator is connected with the dimming processing circuit through the sliding resistor, the negative input end of the operation comparator is connected with the first end of the voltage acquisition circuit, the output end of the operation comparator is connected with the grid electrode of the first transistor, the source electrode of the first transistor is connected with the second end of the voltage acquisition circuit, and the drain electrode of the first transistor is connected with the first end of the light source module.

8. The dimmer circuit of claim 5, wherein the voltage control circuit comprises a second switching circuit and a voltage compensation circuit;

the first end of the second switch circuit is connected with the dimming processing circuit, the second end of the second switch circuit is connected with the first end of the voltage compensation circuit, and the second end of the voltage compensation circuit is connected with the second end of the light source module.

9. The dimming circuit of claim 8, wherein the second switching circuit comprises a second transistor, a fifth resistor, and a sixth resistor;

the source electrode of the second transistor is connected with the voltage compensation circuit, the grid electrode of the second transistor is respectively connected with the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is connected with the dimming processing circuit, and the second end of the sixth resistor and the drain electrode of the second transistor are grounded.

10. The dimmer circuit of claim 9, wherein the voltage compensation circuit comprises a voltage regulator, a seventh resistor, and an eighth resistor;

the first end of the voltage regulator is connected with the second end of the light source module, the second end of the voltage regulator is respectively connected with the first end of the seventh resistor and the first end of the eighth resistor, the second end of the seventh resistor is connected with the dimming processing circuit, and the second end of the eighth resistor is connected with the source electrode of the second transistor.

11. A light control device comprising a dimming circuit as claimed in any one of claims 1 to 10.