CN215499650U - Brightness control device and lamp - Google Patents

Brightness control device and lamp Download PDF

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CN215499650U
CN215499650U CN202121586495.2U CN202121586495U CN215499650U CN 215499650 U CN215499650 U CN 215499650U CN 202121586495 U CN202121586495 U CN 202121586495U CN 215499650 U CN215499650 U CN 215499650U
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resistor
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刘建华
陈福强
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Guangzhou Caiyi Light Co Ltd
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Guangzhou Caiyi Light Co Ltd
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Abstract

The application relates to a brightness control device and a lamp, the device comprises: the device comprises a voltage generation module, a constant current driving module and a lamp; the voltage generation module, the constant current driving module and the lamp are sequentially connected; the voltage generation module is used for generating output voltage according to preset brightness gradient time and inputting the output voltage to the constant current driving module; and the constant current driving module is used for generating corresponding driving current according to the output voltage and controlling the brightness and the brightness gradient time of the lamp according to the driving current. The technical scheme provided by the embodiment of the application can improve the operability and flexibility of controlling the brightness gradient time of the lamp.

Description

Brightness control device and lamp
Technical Field
The present application relates to the field of lamp technologies, and in particular, to a brightness control device and a lamp.
Background
With the continuous development of the LED technology, LED lamps need to be used in more and more occasions, and there is a higher requirement for controlling the brightness of the LED lamps. For example, LED lamps generally have a function of gradually lighting or gradually dimming, and a stage lighting engineer needs to control the brightness gradient time of the lamps, so as to achieve a richer and more varied stage effect.
However, when the brightness gradient time of the lamp is controlled, the conventional lamp brightness control device needs to frequently modify a program in the control chip to control the duty ratio change time of the PWM pulse width signal, so as to control the brightness gradient time of the lamp. Frequent modification of the program in the control chip results in low operability and poor flexibility in controlling the brightness ramp time of the lamp.
SUMMERY OF THE UTILITY MODEL
Based on this, the embodiment of the application provides a brightness control device and a lamp, which can improve the operability and flexibility of controlling the brightness gradient time of the lamp.
In a first aspect, there is provided a luminance control apparatus, comprising: the device comprises a voltage generation module, a constant current driving module and a lamp; the voltage generation module, the constant current driving module and the lamp are sequentially connected; the voltage generation module is used for generating output voltage according to preset brightness gradient time and inputting the output voltage to the constant current driving module; and the constant current driving module is used for generating corresponding driving current according to the output voltage and controlling the brightness and the brightness gradient time of the lamp according to the driving current.
In one embodiment, the voltage generation module comprises an RC charge and discharge circuit; the RC charge-discharge circuit is connected with the constant current driving module; the RC charge-discharge circuit comprises an original resistor, an original capacitor and a candidate resistor or a candidate capacitor; the candidate resistance or the candidate capacitance is determined based on a preset brightness gradient time; and the RC charge-discharge circuit is used for generating output voltage according to the input voltage, the original resistor, the original capacitor and the candidate resistor or the candidate capacitor.
In one embodiment, the original resistance comprises a first original resistance and a second original resistance; the candidate resistor is connected with the first original resistor in parallel and is connected with the second original resistor in series; or, the candidate capacitor is connected with the original capacitor in parallel; the first original resistor is a resistor for charging the original capacitor based on a power supply; the second original resistor is the resistor for discharging the original capacitor.
In one embodiment, the RC charging and discharging circuit further comprises a first toggle switch; under the condition that the power supply charges the original capacitor through the first original resistor, the first ends of the candidate resistors are respectively connected with one end of the first original resistor; the second end of the candidate resistor is respectively connected with one end of a first dial switch, and the other end of the first dial switch is connected with the other end of the first original resistor; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent resistor obtained by connecting the candidate resistor and the first original resistor in parallel and the original capacitor.
In one embodiment, in a state of discharging from the original capacitor to the second original resistor, the first ends of the candidate resistors are respectively connected with one end of the second original resistor; the second end of the candidate resistor is respectively connected with one end of a first dial switch, and the other end of the first dial switch is connected with the anode of the original capacitor; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent resistor obtained by connecting the candidate resistor and the second original resistor in series and the original capacitor.
In one embodiment, the RC charging and discharging circuit further includes a second dial switch, and in a state where the original capacitor is charged, the cathodes of the candidate capacitors are respectively connected to the cathodes of the original capacitors; the anode of the candidate capacitor is connected with one end of a second dial switch respectively, and the other end of the second dial switch is connected with one end of a first original resistor respectively; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent capacitor obtained by connecting the candidate capacitor and the original capacitor in parallel and the first original resistor.
In one embodiment, in a state of discharging the original capacitor, the cathodes of the candidate capacitors are respectively connected with the cathode of the original capacitor; the anode of the candidate capacitor is connected with one end of a second dial switch respectively, and the other end of the second dial switch is connected with one end of a first original resistor respectively; the other end of the first original resistor is connected with one end of the second original resistor; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent capacitor obtained by connecting the candidate capacitor and the original capacitor in parallel, the first original resistor and the second original resistor.
In one embodiment, the constant current driving module comprises a constant current driving circuit, and the constant current driving circuit comprises a control chip and an external circuit; the control chip is respectively connected with the voltage generation module and the external circuit, and the external circuit is connected with the lamp; the voltage generation module is used for inputting the output voltage to the control chip; and the control chip is used for outputting the driving current according to the output voltage.
In one embodiment, the control chip comprises one of an LM3409HV chip, a tps92641 chip and an AL8862 chip.
In a second aspect, a luminaire is provided, which comprises the brightness control apparatus of any of the above embodiments.
According to the brightness control device and the lamp, the brightness control device comprises the voltage generation module, the constant current driving module and the lamp, the voltage generation module can generate output voltage according to preset brightness gradient time, and the output voltage is input to the constant current driving module; the constant current driving module can generate corresponding driving current according to the output voltage, and then control the brightness and the brightness gradient time of the lamp according to the driving current. In the technical scheme provided by the embodiment of the application, compared with the traditional lamp brightness control device, the duty ratio change time of the PWM pulse width signal is controlled without frequently modifying a program in a control chip, so that the brightness gradual change time of the lamp is controlled, the change time of the voltage input into the constant current driving module is changed through the voltage generating circuit, and the brightness gradual change time of the lamp can be controlled according to the changed driving current because the input voltage of the constant current driving module and the driving current have a linear relation, so that the operability and the flexibility for controlling the brightness gradual change time of the lamp are improved.
Drawings
Fig. 1 is a block diagram of a brightness control apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a simplest RC charging/discharging circuit structure;
fig. 3 is a structural diagram of an RC charging and discharging circuit including a candidate resistor according to an embodiment of the present disclosure;
fig. 4 is a structural diagram of an RC charging and discharging circuit including a candidate capacitor according to an embodiment of the present disclosure;
fig. 5 is a structural diagram of a constant current driving module according to an embodiment of the present application;
FIG. 6 shows a driving current I according to an embodiment of the present applicationLEDA graph of variation with input voltage Vadj;
FIG. 7 shows a driving current I according to an embodiment of the present applicationLEDAnd the change curve chart of the charging and discharging time T.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the present application. The embodiments of the present application can be implemented in many different ways than those described herein and those skilled in the art can make similar modifications without departing from the spirit of the embodiments of the present application, and therefore the embodiments of the present application are not limited to the specific embodiments disclosed below.
In the description of the embodiments of the present application, it should be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the embodiments of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the embodiments of the present application, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In one embodiment, as shown in fig. 1, a block diagram of a brightness control apparatus 10 provided in an embodiment of the present application is shown, the apparatus including: the device comprises a voltage generation module 11, a constant current driving module 12 and a lamp 13; the voltage generation module 11, the constant current driving module 12 and the lamp 13 are connected in sequence; the voltage generation module 11 is configured to generate an output voltage according to a preset brightness gradient time, and input the output voltage to the constant current driving module 12; and the constant current driving module 12 is configured to generate a corresponding driving current according to the output voltage, and control the brightness and the brightness gradient time of the lamp 13 according to the driving current.
The voltage generation module is a device or apparatus capable of outputting a continuously variable voltage, and may adjust a change time of the output voltage, for example, the continuously variable time of the output voltage may be extended or shortened according to a preset brightness gradient time. The preset brightness gradient time may be determined according to the brightness change requirement of the lighting engineer on the lamp, and the brightness gradient time may include a fade-in time and a fade-out time. The output end of the voltage generation module can be connected with the input end of the constant current driving module, so that the output voltage of the voltage generation module can be input into the constant current driving module.
The constant current driving module is used for driving a lamp, namely an LED lamp to work. The constant current driving module can generate corresponding current according to the output voltage of the voltage generating module and control the lamp to work under the current. The constant current driving module can also adjust the current of the lamp, for example, the current can be adjusted to a stable state according to the condition that the current is too large or too small, so that the normal work of the lamp is ensured. Therefore, the constant current driving module can control the brightness and the brightness gradient time of the lamp according to the driving current.
In this embodiment, the luminance control device includes a voltage generation module, a constant current driving module, and a lamp, where the voltage generation module may generate an output voltage according to a preset luminance gradient time, and input the output voltage to the constant current driving module; the constant current driving module can generate corresponding driving current according to the output voltage, and then control the brightness and the brightness gradient time of the lamp according to the driving current. Compared with the traditional lamp brightness control device, the duty ratio change time of the PWM pulse width signal is controlled without frequently modifying a program in a control chip, so that the brightness gradient time of the lamp is controlled, the change time of the voltage input into the constant current driving module is changed through the voltage generating circuit, and the input voltage of the constant current driving module and the driving current have a linear relation, so that the brightness and the brightness gradient time of the lamp can be controlled according to the changed driving current, and the operability and flexibility for controlling the brightness gradient time of the lamp are improved.
In one embodiment, the voltage generating module 11 includes an RC charging and discharging circuit; the RC charge-discharge circuit is connected with the constant current driving module 12; the RC charge-discharge circuit comprises an original resistor, an original capacitor and a candidate resistor or a candidate capacitor; the candidate resistance or the candidate capacitance is determined based on a preset brightness gradient time; and the RC charge-discharge circuit is used for generating output voltage according to the input voltage, the original resistor, the original capacitor and the candidate resistor or the candidate capacitor.
Fig. 2 is a simplified structural diagram of the RC charging and discharging circuit provided in the present application, where R1 and R2 are original resistors, C1 is an original capacitor, VCC is a power supply, and Vadj is an output voltage of the RC charging and discharging circuit. The RC charging and discharging circuit may further include a candidate resistor or a candidate capacitor, as shown in fig. 3 and fig. 4, fig. 3 is a structural diagram of an RC charging and discharging circuit including a candidate resistor according to an embodiment of the present disclosure, and fig. 4 is a structural diagram of an RC charging and discharging circuit including a candidate capacitor according to an embodiment of the present disclosure, where R1 is a protection resistor, the candidate resistor is connected to an original resistor, and the candidate capacitor is connected to an original capacitor. The candidate resistor or the candidate capacitor is determined based on the preset brightness gradient time, that is, whether the candidate resistor or the candidate capacitor is connected to the circuit or not can be selected according to the preset brightness gradient time.
When the candidate resistor or the candidate capacitor is not connected to the circuit, the preset brightness fade-in time is as follows: when VCC is powered on, the RC charging and discharging circuit charges the capacitor C1 through the original resistor R2, and when the capacitor charging voltage VC1 is 0.63VCC, the charging time T1 is the preset brightness fade-in time, which can be calculated through the formula (1). The preset dimming time is as follows: when the VCC is powered off, the capacitor C1 discharges through the original resistor R1, and when the discharge voltage VC1 of the capacitor C1 is 0.37VCC, the discharge time is the preset brightness dimming time, which can be calculated by the formula (2); when the discharge voltage VC1 of the capacitor C1 is 0.01VCC, that is, close to 0V, the discharge time is the preset time T3 required for the full dimming of the lamp, and can be calculated by formula (3), where the charge-discharge voltage VC1 of the capacitor C1 is the output voltage Vadj of the RC charge-discharge circuit.
T1＝τ＝R2*C1 (1)
T2＝τ＝R1*C1 (2)
T3＝5τ＝5*R1*C1 (3)
When the candidate resistors are connected into the circuit, continuing to refer to fig. 3, when the candidate resistors R4, R5, R6 and R7 are connected into the circuit, the resistor R charged by the RC charging and discharging circuitAnd areCan be calculated by the formula (4), so that the preset brightness fade-in time is: when VCC is powered on, RC charge-discharge circuit passes through resistor RAnd areWhen the charging voltage VC1 of the capacitor C1 is 0.63VCC, the charging time T1 is the preset brightness fade-in time, and can be calculated by formula (5). When VCC is powered off, the capacitor C1 passes through the resistors R2 and RAnd areWhen the discharge voltage VC1 of the capacitor C1 is 0.01VCC, that is, close to 0V, the discharge time is the preset time T3 required for full dimming of the lamp, and can be calculated by equation (6).
RAnd are＝(R3+R4+R5+R6+R7)/(R3*R4*R5*R6*R7) (4)
T1＝RAnd are*C1＝((R3+R4+R5+R6+R7)/(R3*R4*R5*R6*R7))*C1 (5)
T3 ═ 5 ═ (R and + R2) × C1 ═ 5 × (R3+ R4+ R5+ R6+ R7)/(R3 × R4 × R5 × R6 × R7) + R2) × C1 (6)
When the candidate capacitors are connected into the circuit, continuing to refer to fig. 4, when the candidate capacitors C2, C3, C4 and C5 are all connected into the circuit, the capacitor C charged and discharged by the RC charging and discharging circuitAnd areCan be calculated by the formula (7). So that the preset brightness fade-in time is as follows: when VCC is powered on, the RC charge-discharge circuit couples the capacitor C through the original resistor R3And areCharging is carried out when the capacitor C is chargedAnd areThe charging voltage VC1 is 0.63VCC, and the charging time T1 is the preset brightness fade-in time, which can be calculated by formula (8). When VCC is off, the capacitor CAnd areDischarging through the original resistors R2 and R3 when the capacitor C is chargedAnd areWhen the discharge voltage VC1 is 0.01VCC, that is, when the discharge voltage is close to 0V, the discharge time is the preset time T3 required for full dimming of the lamp, and can be calculated by equation (9).
CAnd are＝C1+C2+C3+C4+C5 (7)
T1＝R3*CAnd are＝R3*(C1+C2+C3+C4+C5) (8)
T3＝5*(R2+R3)*CAnd are＝5*(R2+R3)*(C1+C2+C3+C4+C5) (9)
In this embodiment, the voltage generation module includes an RC charging and discharging circuit; the RC charge-discharge circuit can generate output voltage according to the input voltage, the original resistor, the original capacitor and the candidate resistor or the candidate capacitor. The candidate resistors or the candidate capacitors connected into the circuit can be selected according to the preset brightness gradually-lighting time, so that the more the candidate resistors are, the smaller the resistance value is, the shorter the charging and discharging time is, and vice versa; the more the candidate capacitors are, the larger the capacitance value is, the longer the charging and discharging time is, and vice versa, so that the change time of the output voltage can be adjusted, the convenience and the flexibility of the voltage generation module for generating the adjustable output voltage are improved, and the output driving current is linear and continuous, so that the dimming is smoother.
In one embodiment, the raw resistance comprises a first raw resistance and a second raw resistance; the candidate resistor is connected with the first original resistor in parallel and is connected with the second original resistor in series; or, the candidate capacitor is connected with the original capacitor in parallel; the first original resistor is a resistor for charging the original capacitor based on a power supply; the second original resistor is the resistor for discharging the original capacitor.
With continued reference to fig. 3 and fig. 4, the original resistor includes a first original resistor R3 and a second original resistor R2, the candidate resistor is connected in parallel with the first original resistor and in series with the second original resistor, the candidate capacitor is connected in parallel with the original capacitor, the candidate resistor and the candidate capacitor can be selected by turning on and off the switch control circuit, and the type of the switch is not particularly limited.
In an alternative embodiment, the switch may be a toggle switch, that is, the RC charging and discharging circuit further includes a first toggle switch. Under the condition that the power supply charges the original capacitor through the first original resistor, the first ends of the candidate resistors are respectively connected with one end of the first original resistor; the second end of the candidate resistor is respectively connected with one end of a first dial switch, and the other end of the first dial switch is connected with the other end of the first original resistor; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent resistor obtained by connecting the candidate resistor and the first original resistor in parallel and the original capacitor. Under the state that the original capacitor discharges to the second original resistor, the first ends of the candidate resistors are respectively connected with one end of the second original resistor; the second end of the candidate resistor is respectively connected with one end of a first dial switch, and the other end of the first dial switch is connected with the anode of the original capacitor; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent resistor obtained by connecting the candidate resistor and the second original resistor in series and the original capacitor.
With continued reference to fig. 3, the first toggle switch is used to select whether the candidate resistor is connected to a device in the RC charging/discharging circuit, which is denoted as "BOMA _ KEY", the terminals 1, 2, 3, and 4 "indicate an" on state ", and the terminals 8, 7, 6, and 5" indicate an "off state". The input voltage refers to voltage provided by a power supply VCC of the RC charge-discharge circuit, equivalent resistance obtained by connecting the candidate resistance and the first original resistance in parallel can be obtained by calculating a resistance parallel formula, and equivalent resistance obtained by connecting the candidate resistance and the second original resistance in series can be obtained by calculating a resistance series formula.
With reference to the above embodiment, when the candidate resistor is selected by the first toggle actuator, for example, the first path of the first toggle actuator is turned off, then R4 is opened, and at this time, the charging and discharging time can be calculated by formula (10) -formula (12), and so on for the calculation processes of other toggle addresses.
RAnd are＝(R3+R5+R6+R7)/(R3*R5*R6*R7) (10)
T1＝RAnd are*C1＝((R3+R5+R6+R7)/(R3*R5*R6*R7))*C1 (11)
T3 ═ 5 ═ C1 ═ 5 ═ C (R2) ((R3+ R5+ R6+ R7)/(R3 × R5 × R6 × R7) + R2) × C1 (12)
In this embodiment, the candidate resistors are selected by the first dial switch, and the first dial switch can select N paths, so that there may be 2 pathsNAnd the selection mode of the group can set more brightness gradient time in practical application, so that the operability and flexibility of controlling the brightness gradient time of the lamp are improved. Moreover, the structure is simple, the use is convenient, the hardware cost is low, the reliability is high, the flexibility and the changeability are realized, and the maintenance requirement is low; the production process is simple, and the production cost, the labor cost and the storage cost are greatly saved; the material consumption is simple, and the purchase is convenient; furthermore, after-sales personnel can conveniently perform field maintenance, even non-professional technicians can simply and clearly know the brightness gradient time constant by checking dial addresses, users can also switch according to requirements, and maintenance cost is greatly reduced.
In an optional embodiment, the RC charging and discharging circuit further includes a second dial switch, please continue to refer to fig. 4, the second dial switch is used to select whether the candidate capacitor is connected to the device in the RC charging and discharging circuit. Under the state of charging the original capacitor, the cathodes of the candidate capacitors are respectively connected with the cathode of the original capacitor; the anode of the candidate capacitor is connected with one end of a second dial switch respectively, and the other end of the second dial switch is connected with one end of a first original resistor respectively; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent capacitor obtained by connecting the candidate capacitor and the original capacitor in parallel and the first original resistor. Under the state of discharging the original capacitor, the cathodes of the candidate capacitors are respectively connected with the cathode of the original capacitor; the anode of the candidate capacitor is connected with one end of a second dial switch respectively, and the other end of the second dial switch is connected with one end of a first original resistor respectively; the other end of the first original resistor is connected with one end of the second original resistor; and the RC charge-discharge circuit is also used for generating output voltage according to the input voltage, the equivalent capacitor obtained by connecting the candidate capacitor and the original capacitor in parallel, the first original resistor and the second original resistor.
The input voltage refers to the voltage provided by a power supply VCC of the RC charge-discharge circuit, and the equivalent capacitance obtained by connecting the candidate capacitance and the original capacitance in parallel can be obtained by calculating a capacitance parallel formula.
In this embodiment, the first dip switch selects the candidate capacitor, and the second dip switch can select N channels, so that there may be 2 channelsNAnd the selection mode of the group can set more brightness gradient time in practical application, so that the operability and flexibility of controlling the brightness gradient time of the lamp are improved.
In one embodiment, the constant current driving module 12 includes a constant current driving circuit, which includes a control chip and an external circuit; the control chip is respectively connected with the voltage generation module and the external circuit, and the external circuit is connected with the lamp; the voltage generation module is used for inputting the output voltage to the control chip; and the control chip is used for outputting the driving current according to the output voltage.
The control chip is also called a driving chip and is a key device forming the constant current driving module, optionally, the control chip may include one of an LM3409HV chip, a tps92641 chip and an AL8862 chip, and may further include other chips having an analog voltage linear regulation function interface. Taking the control chip as an example, the LM3409HV chip is shown in fig. 5, and fig. 5 is a constant current driver provided in this embodiment of the present applicationThe structure of the module, wherein the control chip is LM3409HV chip, the external circuit is the constituent circuit of LM3409HV chip, can include freewheeling diode D1, inductance L1, MOS pipe Q1, detect the resistance R of feedback voltageSNSAnd a bypass capacitor CINCarrier frequency capacitance COFFAnd carrier frequency resistance ROFF. The input of the PWM signal duty ratio interface EN of the control chip is 100 percent, namely the PWM signal duty ratio interface EN is directly connected to a high level, and the analog dimming port is input into the level interface IADJ and is connected with the output end Vadj of the voltage generating circuit.
For the control chip, by consulting the chip specification, a certain linear relation exists between the output current and the voltage of the input port of the analog dimming port, and the linear relation can be specifically expressed by a formula (13).
ILED＝VADJ/(5*RSNS)-VO*tOFF/(2*L1) (13)
Wherein R isSNSL1 constant, VOThe characteristic value of the LED light source is also a constant and can be determined by consulting the specification of the LED light source. t is tOFFFrom R in the circuitOFFAnd COFFDetermination of ROFFAnd COFFAnd all the parameters are fixed and can be calculated by the formula (14).
tOFF＝-ROFF*(COFF+20PF)*ln(1-1.24V/VO) (14)
According to the formula (13) and the formula (14), the drive current value I can be calculated by the formula (15)LED。
ILED＝VADJ/(5*RSNS)+VO*ROFF*(COFF+20PF)*ln(1-1.24V/VO)/(2*L1) (15)
It can be seen that a continuously varying Vadj, drive current I is obtainedLEDWill correspondingly follow the continuous variation of the Vadj voltage value, as shown in fig. 6, fig. 6 provides a driving current I for the embodiment of the present applicationLEDVersus the input voltage Vadj. The time constant τ is also a first order relation RC, and the charging and discharging time T and Vadj are also a first order relation within a certain range, so that the constant current driving current I is satisfiedLEDAnd chargingThe discharge time T has a first order relation, as shown in FIG. 7, FIG. 7 shows a driving current I provided by an embodiment of the present applicationLEDAnd the change curve chart of the charging and discharging time T.
In one embodiment, a lamp is further provided, and the lamp comprises the brightness control device in any one of the above embodiments.
The implementation principle and the beneficial effect of the lamp provided by this embodiment may refer to the above definition of each embodiment of the brightness control device, and are not described herein again.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A luminance control apparatus, characterized in that the apparatus comprises: the device comprises a voltage generation module, a constant current driving module and a lamp; the voltage generation module, the constant current driving module and the lamp are sequentially connected;
the voltage generation module is used for generating output voltage according to preset brightness gradient time and inputting the output voltage to the constant current driving module;
and the constant current driving module is used for generating corresponding driving current according to the output voltage and controlling the brightness and the brightness gradient time of the lamp according to the driving current.
2. The apparatus of claim 1, wherein the voltage generation module comprises an RC charging and discharging circuit; the RC charge-discharge circuit is connected with the constant current driving module;
the RC charge-discharge circuit comprises an original resistor, an original capacitor and a candidate resistor or a candidate capacitor; the candidate resistance or the candidate capacitance is determined based on a preset brightness gradient time;
and the RC charge-discharge circuit is used for generating the output voltage according to the input voltage, the original resistor, the original capacitor and the candidate resistor or the candidate capacitor.
3. The apparatus of claim 2, wherein the raw resistance comprises a first raw resistance and a second raw resistance; the candidate resistor is connected in parallel with the first original resistor and in series with the second original resistor; or, the candidate capacitor is connected with the original capacitor in parallel;
the first original resistor is a resistor for charging the original capacitor based on a power supply; the second original resistor is a resistor for discharging the original capacitor.
4. The apparatus of claim 3, wherein the RC charge and discharge circuit further comprises a first dip switch;
under the state that the original capacitor is charged through the first original resistor based on a power supply, the first ends of the candidate resistors are respectively connected with one end of the first original resistor; the second end of the candidate resistor is respectively connected with one end of the first dial switch, and the other end of the first dial switch is connected with the other end of the first original resistor;
the RC charge-discharge circuit is further used for generating the output voltage according to the input voltage, the equivalent resistance obtained by connecting the candidate resistance and the first original resistance in parallel and the original capacitance.
5. The apparatus of claim 4, wherein the first ends of the candidate resistors are respectively connected to one end of the second original resistor in a state of being discharged from the original capacitor to the second original resistor; the second end of the candidate resistor is respectively connected with one end of the first dial switch, and the other end of the first dial switch is connected with the anode of the original capacitor;
the RC charge-discharge circuit is further used for generating the output voltage according to the input voltage, the equivalent resistor obtained by connecting the candidate resistor and the second original resistor in series and the original capacitor.
6. The device of claim 3, wherein the RC charge-discharge circuit further comprises a second toggle actuator, and cathodes of the candidate capacitors are respectively connected to cathodes of the original capacitors in a state of charging the original capacitors; the anode of the candidate capacitor is connected with one end of the second dial switch, and the other end of the second dial switch is connected with one end of the first original resistor;
the RC charge-discharge circuit is further used for generating the output voltage according to the input voltage, the equivalent capacitor obtained by connecting the candidate capacitor and the original capacitor in parallel and the first original resistor.
7. The apparatus of claim 6, wherein the cathodes of the candidate capacitors are respectively connected to the cathodes of the original capacitors in a discharging state of the original capacitors; the anode of the candidate capacitor is connected with one end of the second dial switch, and the other end of the second dial switch is connected with one end of the first original resistor; the other end of the first original resistor is connected with one end of the second original resistor;
the RC charge-discharge circuit is further used for generating the output voltage according to the input voltage, the equivalent capacitor obtained by connecting the candidate capacitor and the original capacitor in parallel, the first original resistor and the second original resistor.
8. The device according to claim 1, wherein the constant current driving module comprises a constant current driving circuit, and the constant current driving circuit comprises a control chip and an external circuit; the control chip is respectively connected with the voltage generation module and the external circuit, and the external circuit is connected with the lamp;
the voltage generation module is used for inputting the output voltage to the control chip;
and the control chip is used for outputting a driving current according to the output voltage.
9. The device of claim 8, wherein the control chip comprises one of a LM3409HV chip, a tps92641 chip, and an AL8862 chip.
10. A luminaire characterized in that it comprises a brightness control means according to any one of claims 1-9.
CN202121586495.2U 2021-07-13 2021-07-13 Brightness control device and lamp Active CN215499650U (en)

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Application Number Priority Date Filing Date Title
CN202121586495.2U CN215499650U (en) 2021-07-13 2021-07-13 Brightness control device and lamp

Publications (1)

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