CN107396495B - Constant-current driving device and lamp - Google Patents
Constant-current driving device and lamp Download PDFInfo
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- CN107396495B CN107396495B CN201710666621.7A CN201710666621A CN107396495B CN 107396495 B CN107396495 B CN 107396495B CN 201710666621 A CN201710666621 A CN 201710666621A CN 107396495 B CN107396495 B CN 107396495B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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Abstract
The invention is suitable for the technical field of driving power supplies and provides a constant-current driving device and a lamp. The constant current driving device includes: the rectification module is used for converting alternating current of an external power supply into direct current; the signal processing module is connected with the output end of the rectifying module, is also suitable for being connected with the light-emitting module, and is used for receiving the direct current information of the rectifying module and the on-voltage information of the light-emitting module and sending a current adjustment signal to the constant-current module; the output end of the rectifying module is also suitable for being connected with the light-emitting module; and the constant current module is connected with the output end of the signal processing module, is also suitable for being connected with the light emitting module and is used for adjusting the current of the light emitting module according to the adjusting signal. The constant-current driving device and the lamp realize that the input power of the power supply is kept unchanged under different power grid voltage inputs.
Description
Technical Field
The invention belongs to the technical field of driving power supplies, and particularly relates to a constant-current driving device and a lamp.
Background
In the traditional linear constant current driving device, the grid voltage is rectified through a rectifier bridge, and after the rectified voltage is higher than the voltage of an LED (light emitting diode ) string light, the constant current driving device outputs constant current. The input power of the constant current driving device can be understood as the product of the average voltage value of the input voltage and the input current in the operation process of the light string, wherein the input current amplitude of the constant current driving device is equal to the output current peak value of the constant current driving device, namely the peak current of the LED light string and the light string voltage are fixed values. Because the constant current driving device is under different input voltages, the average value of the input voltages is the variation, and the input power of the LED lamp string is different. The lamp of the constant current driving device has the problems that the whole input power cannot be kept consistent under different input voltages, and when the input power grid voltage is low, the input power of the system is low, and the lamp is darker; when the input grid voltage is high, the input power of the system is high, and the lamp is brighter.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a constant current driving device and a lamp, which are used for solving the problem that the input power of the constant current driving device cannot be kept consistent under different input voltages in the prior art.
A first aspect of an embodiment of the present invention provides a constant current driving device, including:
the rectification module is used for converting alternating current of an external power supply into direct current;
the signal processing module is connected with the output end of the rectifying module, is also suitable for being connected with the light-emitting module, and is used for receiving the direct current information of the rectifying module and the on-voltage information of the light-emitting module and sending a current adjustment signal to the constant-current module; the output end of the rectifying module is also suitable for being connected with the light-emitting module;
and the constant current module is connected with the output end of the signal processing module, is also suitable for being connected with the light emitting module and is used for adjusting the current of the light emitting module according to the adjusting signal.
Optionally, the rectifying module includes:
the input end of the rectifier bridge DB1 is connected with the L line of the alternating current power grid, the output end of the rectifier bridge DB1 is connected with the output end of the rectifier module, and the grounding end is grounded.
Optionally, the rectifying module further includes:
one end of the protection resistor FR1 is connected with an alternating current power grid L line, and the other end of the protection resistor FR1 is connected with the input end of the rectifier bridge DB 1; the input end of the rectifier bridge DB1 is connected with the L line of the alternating current power grid through the protection resistor FR1.
Optionally, the signal processing module is an integrated circuit.
Optionally, the current adjustment signal includes a current PWM (Pulse Width Modulation, pulse width modulated) pulse width duty cycle adjustment signal and a current amplitude adjustment signal; the constant current module is provided with a first input end and a second input end, the first input end receives the current amplitude adjusting signal, and the second input end receives the current PWM pulse width duty cycle adjusting signal;
the constant current module includes:
the input end of the amplitude adjustment unit is connected with the first input end of the constant current module, the output end of the amplitude adjustment unit is suitable for being electrically connected with the light-emitting module, and the current of the light-emitting module is adjusted according to the current amplitude adjustment signal;
and the input end of the duty ratio adjusting unit is connected with the second input end of the constant current module, the output end of the duty ratio adjusting unit is suitable for being electrically connected with the light emitting module, and the current of the light emitting module is adjusted according to the current PWM pulse width duty ratio adjusting signal.
Optionally, the duty ratio adjustment unit includes: and the grid electrode of the power tube Q2 is connected with the input end of the duty ratio adjusting unit, the drain electrode of the power tube Q2 is suitable for being electrically connected with the light emitting module, and the source electrode of the power tube Q is grounded.
Optionally, the current of the light emitting component includes a current amplitude and a current duty cycle;
the amplitude adjusting unit adjusts the current amplitude according to the current amplitude adjusting signal;
the duty ratio adjusting unit adjusts the current duty ratio according to the current PWM pulse width duty ratio adjusting signal.
Optionally, the adjusting the current amplitude by the amplitude adjusting unit according to the current amplitude adjusting signal specifically includes:
when the voltage amplitude of the alternating current power grid is increased, the current amplitude adjustment signal is decreased, and the current amplitude is decreased;
when the voltage amplitude of the alternating current power grid becomes smaller, the current amplitude adjusting signal becomes larger, and the current amplitude becomes larger.
Optionally, the constant current module further includes: the operational amplifier, the switching tube Q1 and the sampling resistor R1;
the positive input end of the operational amplifier is connected with the output end of the amplitude adjusting unit, the negative input end of the operational amplifier is connected with one end of the sampling resistor R1, and the output end of the operational amplifier is connected with the grid electrode of the switching tube Q1 and the common end of the drain electrode of the power tube Q2;
the drain electrode of the switching tube Q1 is connected with the light-emitting module, and the source electrode is connected with the negative input end of the operational amplifier and the common end of one end of the sampling resistor R1; the other end of the sampling resistor R1 is grounded.
A second aspect of an embodiment of the invention provides a luminaire comprising a light emitting module and a constant current drive arrangement as described in any of the above embodiments.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the current regulation signal is sent to the constant current module by analyzing the on-voltage information of the light emitting module and the direct current information of the rectifying module through the constant current driving device and the signal processing module of the lamp; the constant current module adjusts the current sent by the light emitting module according to the current adjusting signal, so that the power input power of the power supply is kept unchanged under different power grid voltage inputs.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a constant current driving device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another constant current driving device according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a constant current driving device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an implementation flow of the constant current driving device shown in FIG. 3;
fig. 5 is a current waveform diagram of a constant current driving device according to an embodiment of the present invention for adjusting the amplitude of an output current under different input voltages;
fig. 6 is a current waveform diagram of a constant current driving device according to an embodiment of the present invention for adjusting duty ratio of output current under different input voltages;
fig. 7 is a current waveform diagram of a constant current driving device provided by an embodiment of the invention, in which the amplitude of an output current and the current duty ratio are adjusted simultaneously under different input voltages.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Example 1
Referring to fig. 1, a constant current driving device according to an embodiment of the present invention includes a rectifying module 100, a signal processing module 300, and a constant current module 400.
The rectification module 100 is used for converting alternating current of an external power supply into direct current.
The signal processing module 300 is connected with the rectifying module 100, is also suitable for being connected with the light emitting module 200, and is used for receiving direct current information of the rectifying module 100 and on-voltage information of the light emitting module 200 and sending a current adjustment signal to the constant current module 400; the rectifying module 100 is further adapted to be connected to the light emitting module 200.
And the constant current module 400 is connected with the signal processing module 300, is also suitable for being connected with the light emitting module 200, and is used for adjusting the current of the light emitting module 200 according to the adjusting signal.
In the constant current driving device, the signal processing module 300 transmits a current adjustment signal including a current PWM pulse width duty adjustment signal and a current amplitude adjustment signal to the constant current module 400 by analyzing the on-voltage information of the light emitting module 200 and the direct current information of the rectifying module 100. The constant current module 400 adjusts the current of the light emitting module 200 according to the current adjustment signal, wherein the current of the light emitting module 200 comprises a current amplitude and a current duty cycle, i.e. the constant current module 400 adjusts the current amplitude according to the current amplitude adjustment signal and adjusts the current duty cycle according to the current PWM pulse width duty cycle adjustment signal. The constant-current driving device has the advantages that the input power of the constant-current driving device is kept unchanged under different power grid voltage inputs.
Further, referring to fig. 2 and 3, as a specific embodiment, the constant current driving device includes a rectifying module 100, a light emitting module 200, a signal processing module 300, and a constant current module 400.
The rectification module 100 is used for converting alternating current of an external power supply into direct current, and meanwhile, the amplitude information of the alternating current waveform is reserved. The rectifier module 100 specifically includes a rectifier bridge DB1. The input end of the rectifier bridge DB1 is connected with an alternating current power grid L line, the output end of the rectifier bridge DB1 is connected with the output end of the rectifier module 100, and the grounding end of the rectifier bridge DB1 is grounded. In this embodiment, the rectifier bridge DB1 includes a plurality of diodes. Preferably, the number of the diodes in the rectifier bridge DB1 is 4, the arrangement mode is surrounding arrangement, and the cathode of the diode 1 is connected with the anode of the diode 2 to be the input end of the rectifier bridge DB 1; the cathode of the diode 2 is connected with the cathode of the diode 3 and is the output end of the rectifier bridge DB 1; the anode of the diode 3 is connected with the cathode of the diode 4 and is the grounding end of the rectifier bridge DB 1; the positive electrode of the diode 4 is connected to the positive electrode of the diode 1 and is an input terminal of the rectifier bridge DB1.
Optionally, the rectifying module 100 further includes a protection resistor FR1. And one end of the protection resistor FR1 is connected with an L line of the alternating current power grid, and the other end of the protection resistor FR1 is connected with the input end of the rectifier bridge DB1 and is used for preventing the whole circuit from being impacted when the alternating current power grid inputs alternating current, and damaging the circuit, namely overvoltage and overcurrent protection.
Optionally, the light emitting module 200 is connected to the signal processing module 300, and sends the on-voltage information to the signal processing module 300. The light emitting module 200 is also adapted to be connected to the constant current module 400, and the light emitting module 200 inputs current information to the constant current module 400. The light emitting module 200 may be various light emitting devices, such as LED light strings that may be connected in series or in parallel, but the device of the light emitting module 200 is not limited in this embodiment.
Optionally, the signal processing module 300 is an integrated circuit, and is configured to adaptively send a current adjustment signal to the constant current module 400 when the direct current information and the on-voltage information of the light emitting module 200 are detected, where the current adjustment signal includes a current PWM pulse width duty cycle adjustment signal and a current amplitude adjustment signal. It will be appreciated by those skilled in the art that the PWM pulse width duty cycle is the proportion of the high level to the entire period of one pulse period, which is related to the magnitude of the input current to the entire light emitting module 200.
Specifically, the signal processing module 300 may include a signal detection unit 301 and a control unit 302.
The signal detection unit 301 is configured to receive the dc information subjected to the rectification processing sent by the rectification module 100 and the on-voltage information sent by the light emitting module 200.
The control unit 302 is configured to send a current adjustment signal to the constant current module 400, where the current adjustment signal includes a current PWM pulse width duty cycle adjustment signal and a current amplitude adjustment signal. The constant current module 400 has a first input terminal that receives the current amplitude adjustment signal and a second input terminal that receives the current PWM pulse width duty cycle adjustment signal.
In particular applications, the signal processing module 300 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), discrete gate or transistor logic, discrete hardware components, or the like.
Optionally, the constant current module 400 is connected to the light emitting module 200, receives the current of the light emitting module 200, is also suitable for being connected to the signal processing module 300, receives the current PWM duty cycle adjustment signal and the current amplitude adjustment signal, and adjusts the current sent by the light emitting module 200 according to the adjustment signal. The light emitting module 200 current includes a current magnitude and a current duty cycle.
Further, the constant current module 400 may include an amplitude adjustment unit 401 and a duty ratio adjustment unit 402.
The input end of the amplitude adjustment unit 401 is connected with the first input end of the constant current module 400, the output end is suitable for being connected with the light emitting module 200, and the current of the light emitting module 200 is adjusted according to the current amplitude adjustment signal.
And the duty ratio adjusting unit 402 has an input end connected to the second input end of the constant current module 400, and an output end adapted to be connected to the light emitting module 200, and adjusts the current of the light emitting module 200 according to the current PWM pulse width duty ratio adjusting signal.
Optionally, the amplitude adjustment unit 401 may include: the input terminal of the amplitude adjustment circuit is connected to the input terminal of the amplitude adjustment unit 401. The amplitude adjustment circuit is an integrated circuit, which may be an application specific integrated circuit (Application Specific Integrated Circuit, ASIC). The duty cycle adjustment unit 402 includes a power transistor Q2. The gate of the power tube Q2 is connected to the input end of the duty ratio adjustment unit 402, the drain of the power tube Q2 is connected to the light emitting module, and the source of the power tube Q2 is grounded.
The constant current module 400 further includes an operational amplifier, a switching tube Q1, and a sampling resistor R1. The positive input end of the operational amplifier is connected with the output end of the amplitude adjusting circuit, the output end of the operational amplifier is connected with the drain electrode of the power tube Q2, and the negative input end of the operational amplifier is connected with the source electrode of the switching tube Q1 and the common end of one end of the sampling resistor R1. The drain electrode of the switching tube Q1 is suitable for being connected with the light emitting module 200, and the grid electrode of the switching tube Q1 is connected with the output end of the operational amplifier and the common end of the drain electrode of the power tube Q2. One end of the sampling resistor R1 is respectively connected with the source electrode of the switching tube Q1 and the negative input end of the operational amplifier, and the other end of the sampling resistor R is grounded; the source electrode of the switching tube Q1 and the negative input end of the operational amplifier are grounded through the sampling resistor R1.
Specifically, the constant current module 400 in this embodiment may include an amplitude adjusting circuit, an operational amplifier, a switching tube Q1, a power tube Q2, and a sampling resistor R1. The signal processing module 300 outputs a current amplitude adjustment signal to enter a first input end of the constant current module 400, namely, enters an input end of the amplitude adjustment circuit, the amplitude adjustment circuit adjusts the current amplitude adjustment signal, the current amplitude adjustment signal changes according to the alternating current waveform change of the alternating current power grid, namely, when the voltage amplitude of the alternating current power grid becomes larger, the current amplitude adjustment signal becomes smaller; when the voltage amplitude of the ac power grid becomes smaller, the current amplitude adjustment signal becomes larger. The amplitude adjusting circuit inputs the current amplitude adjusting signal into the positive input end of the operational amplifier, the output end of the operational amplifier is connected with the grid electrode of the switching tube Q1, the drain electrode of the switching tube Q1 is connected with the output end of the light emitting module 200, and the current amplitude of the light emitting assembly 200 is adjusted to meet constant input power; the negative input end of the operational amplifier is connected with the source electrode of the switching tube Q1, one end of the sampling resistor R1 is connected with the source electrode of the switching tube Q1, and the other end of the current sampling resistor R1 is connected with the system ground.
The signal processing module 300 outputs a current PWM duty cycle adjustment signal to a second input end of the constant current module 400, that is, a gate of the power tube Q2, and the power tube Q2 adjusts the current duty cycle of the light emitting module 200 according to the current PWM duty cycle adjustment signal, so that the current duty cycle changes along with the change of the ac waveform, so as to meet the constant input power. Namely, when the voltage of the alternating current power grid becomes large, the current PWM pulse width duty ratio adjusting signal becomes large, and the current duty ratio becomes small; when the voltage of the alternating current power grid is reduced, the current PWM pulse width duty ratio adjusting signal is reduced, and the current duty ratio is increased; the drain electrode of the power tube Q2 is connected with the grid electrode of the field switching tube Q1, and the source electrode of the power tube Q2 is grounded.
It should be understood that the invention is not limited to a single system application, when multiple systems are used in combination. The modules or units in the system of the embodiment of the invention can be combined, divided and deleted according to actual needs.
Further, in one embodiment, the working process of the constant current driving device is as follows:
s401, the rectifying module 100 converts the ac power input by the ac power grid into dc power, and outputs the dc power to the light emitting module 200, and sends the dc power information to the signal processing module 300.
The alternating current passes through the protection resistor FR1, the protection resistor buffers the alternating current to prevent the circuit from being damaged due to overlarge alternating current, the alternating current enters the input end of the rectifier bridge DB1 through the protection resistor FR1, the rectifier bridge DB1 converts the alternating current into direct current and outputs the light-emitting module 200, and the direct current information is sent to the signal processing module 300. The rectification module 100 retains the waveform amplitude of the ac power transformation when converting the ac power into the dc power, and the dc power information includes the waveform amplitude of the ac power transformation.
S402, the light emitting module 200 sends on-voltage information to the signal processing module 300, and the light emitting module 200 sends current to the constant current module 400.
The on-voltage information is voltage information of the input power of the light emitting module 200, and the current is a current of the direct current flowing through the light emitting module 200. The light emitting module 200 may be any light emitting device, and preferably, the light emitting module 200 of this embodiment provides an LED light string, and the number and arrangement of LED lamps of the LED light string are not limited in this embodiment.
S403, the signal processing module 300 sends a current adjustment signal to the constant current module 400 according to the dc information and the on-voltage information of the light emitting module 200.
The current adjustment signal comprises a current PWM pulse width duty cycle adjustment signal and a current amplitude adjustment signal.
S404, the constant current module 400 adjusts the current of the light emitting module 200 according to the current adjustment signal, and sends the adjusted current to the light emitting module 200.
The signal processing module 300 sends the current amplitude adjustment signal to the first input terminal of the constant current module 400, and sends the current PWM pulse width duty cycle adjustment signal to the second input terminal of the constant current module 400. Further, the constant current module 400 includes an amplitude adjustment unit 401 for adjusting the current of the light emitting module 200 according to a current amplitude adjustment signal; the duty ratio adjusting unit 402 is configured to adjust the current of the light emitting module 200 according to the current adjustment signal. The current of the light emitting module 200 includes the current amplitude and the current duty ratio.
Specifically, the amplitude adjustment unit 401 adjusts the current amplitude according to the current amplitude adjustment signal; the duty cycle adjustment unit 402 adjusts the current duty cycle according to the current PWM pulse width duty cycle adjustment signal.
The duty ratio adjustment unit 401 adjusts the current amplitude according to the current amplitude adjustment signal specifically as follows:
the constant current driving device converts alternating current into direct current by the rectification module 100 under the condition that different voltages are input by an external power supply, the amplitude of alternating current variation waveforms is stored, and the signal processing module 300 collects direct current information of the rectification module 100. When the dc voltage is higher than the voltage required by the light emitting module 200, the signal processing module 300 outputs a current amplitude adjustment signal Vref through internal operation, where the current amplitude adjustment signal Vref is an analog quantity. Vref changes according to a certain proportion value along with the change of alternating current, namely when the voltage amplitude of an alternating current power grid becomes large, the current amplitude adjusting signal becomes small, and the current amplitude becomes small; when the voltage amplitude of the alternating current power grid becomes smaller, the current amplitude adjusting signal becomes larger, and the current amplitude becomes larger.
For example, the constant current driving device is input by different voltages U1, U2 and U3, and U1< U2< U3; the current amplitude adjusting signal Vref values are Vref1, vref2 and Vref3 in sequence, wherein Vref1> Vref2> Vref3. The current amplitude adjusting signal Vref enters the amplitude adjusting unit 401 of the constant current module 400, and the amplitude adjusting unit 401 adjusts the current amplitude input by the light emitting module 200 through the current amplitude adjusting signal Vref, so that the current amplitude changes along with the change of direct current information, and the waveform of the output current is ensured to be basically consistent with the waveform of the rectified grid voltage in shape. As shown in fig. 5, when the voltage amplitude of the ac power grid becomes large, the current amplitude adjustment signal becomes small, and the current amplitude becomes small; when the voltage amplitude of the alternating current power grid becomes smaller, the current amplitude adjusting signal becomes larger, and the current amplitude becomes larger.
Specifically, in an AC power grid voltage working period, the peak value of the input AC voltage is a fixed value, and when the AC voltage rises from 0V to a light emitting modeThe on-voltage of block 200, the constant current drive device starts to output current, and in the process that the grid voltage continues to rise to the maximum value, the output current also rises to the peak current synchronously, and at this time, the working current waveform of the constant current drive device is shown in fig. 5. The input power system of the constant current driving device can be understood as the product of the average voltage value of the input voltage and the input current, i.e., P, during the operation of the light emitting module 200 in ＝U Average voltage *I Average current . The current waveform shown in FIG. 5 is integrated over time t1 to t2 to obtain the average voltage
And average current
I.e. constant current drive with input power of
Referring to fig. 3, a schematic circuit structure of a constant current driving device according to an embodiment of the present invention is shown, wherein an output current of the constant current driving device is also an input current of the constant current driving device, and a current value of the input current at positions with different slopes in a waveform is I A The power grid voltage input by the constant current driving device is V in Omega in the formula is a fixed constant 2pi. Under the working state, the constant current driving device inputs I of current under different input voltages A Are different values. With proper arrangement of the constant current module 400, V at different input voltages in *I A Is a constant, and the input power P is the same at different input voltages IN Is a constant value.
The duty ratio adjustment unit 402 adjusts the current duty ratio according to the current PWM pulse width duty ratio adjustment signal specifically as follows:
the constant current driving device converts alternating current into direct current by the rectification module 100 under the condition that different voltages are input by an external power supply, the amplitude of alternating current variation waveforms is stored, and the signal processing module 300 collects direct current information of the rectification module 100. The signal processing module 300 outputs a current PWM pulse width duty cycle adjustment signal that varies according to the input dc information, and the device operating current waveform is shown in fig. 6. The signal processing module 300 outputs a current PWM duty cycle adjustment signal to the constant current module 400, where the current PWM duty cycle adjustment signal enters the gate of the switching tube Q2 of the duty cycle adjustment unit 402, that is, the second input end of the constant current module 400, as shown in fig. 6, with a duty cycle waveform, when the voltage of the ac power grid is large, the current PWM duty cycle adjustment signal becomes large, and the current duty cycle D becomes small; when the voltage of the alternating current power grid is smaller, the current PWM pulse width duty ratio adjusting signal is smaller, and the current duty ratio D is larger. For example, the duty cycle of the operating current of the light emitting module 200 of the constant current driving device is sequentially D1, D2, D3 in three different voltage input ranges U1, U2, U3, where U1< U2< U3, and D1> D2> D3.
In particular, the input power of the constant current driving device can be understood as the product of the average voltage value of the input voltage and the input current, i.e., P, during operation of the light emitting module 200 in ＝U Average voltage *I Average current . The current waveform shown in FIG. 6 is integrated over time t1 to t2 to obtain the input average voltage of the constant current driving device
The output current of the constant current driving device is also the input current of the constant current driving device, and the average current input by the constant current driving device is the product of the peak current of the constant current driving device and the duty ratio D of the input current of the constant current driving device, namely I Average current ＝I max * D, the input power of the constant current driving device is calculated as follows +.>
Wherein I is max The constant current driving device inputs alternating voltage V with a fixed value in Omega is a fixed constant 2 pi and D is a variable value. By proper adjustment of the constant current module 400 circuit, V can be realized in * D isA constant, at this time, the constant current driving device inputs power P under different input voltages in Is a constant value.
Further, when the constant current driving device is in an operating state, the current amplitude variation and the current duty ratio variation of the light emitting module 200 synchronously change along with the variation of the input ac voltage amplitude. For example, under three different voltage input ranges U1, U2, and U3, the current magnitude of each working voltage of the constant current driving device at a certain moment is sequentially I1, I2, and I3, and the duty ratio magnitude of the working current of the light emitting module 200 is sequentially D1, D2, and D3. Wherein U1<U2<U3, at the same time D1>D2>D3，I1>I2>I3, the working current waveform of the constant current driving device at this time is shown in fig. 7. The input power of the constant current driving device is P in ＝U Average voltage *I Average current Integrating the time from t1 to t2 to obtain the input average voltage of the constant current driving device
The average current input by the constant current driving device is
I.e. constant current drive with input power of
By input power P of constant-current driving means IN It can be seen that by proper adjustment, V in *I A * D is a constant, and the constant current driving device inputs power P under different input voltages IN Is a constant value.
Compared with the prior art, the signal processing module 300 of the constant current driving device sends a current adjustment signal to the constant current module 400 by analyzing the on-voltage information of the light emitting module 200 and the direct current information of the rectifying module 100; the constant current module 400 adjusts the current sent by the light emitting module 200 according to the current adjustment signal, so that the power input power is kept unchanged under different power grid voltage inputs.
Example two
The embodiment provides a lamp, which comprises a light emitting module and any one of the constant current driving devices in the first embodiment, and has the beneficial effects of the constant current driving device.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. A constant current drive apparatus, characterized by comprising:
the rectification module is used for converting alternating current of an external power supply into direct current;
the signal processing module is connected with the output end of the rectifying module, is also suitable for being connected with the light-emitting module, and is used for receiving the direct current information of the rectifying module and the on-voltage information of the light-emitting module and sending a current adjustment signal to the constant-current module; the output end of the rectifying module is also suitable for being connected with the light-emitting module;
the constant current module is connected with the output end of the signal processing module, is also suitable for being connected with the light emitting module and is used for adjusting the current of the light emitting module according to the adjusting signal;
the rectifying module comprises a rectifying bridge DB1, an input end of the rectifying module is connected with an alternating current power grid L line, an output end of the rectifying module is connected with an output end of the rectifying module, and the grounding end of the rectifying module is grounded;
the current adjustment signal comprises a current PWM pulse width duty cycle adjustment signal and a current amplitude adjustment signal; the constant current module is provided with a first input end and a second input end, the first input end receives the current amplitude adjusting signal, and the second input end receives the current PWM pulse width duty cycle adjusting signal;
the constant current module includes:
the input end of the amplitude adjustment unit is connected with the first input end of the constant current module, the output end of the amplitude adjustment unit is suitable for being electrically connected with the light-emitting module, and the current of the light-emitting module is adjusted according to the current amplitude adjustment signal;
and the input end of the duty ratio adjusting unit is connected with the second input end of the constant current module, the output end of the duty ratio adjusting unit is suitable for being electrically connected with the light emitting module, and the current of the light emitting module is adjusted according to the current PWM pulse width duty ratio adjusting signal.
2. The constant current drive apparatus according to claim 1, wherein the rectifying module further comprises:
one end of the protection resistor FR1 is connected with an alternating current power grid L line, and the other end of the protection resistor FR1 is connected with the input end of the rectifier bridge DB 1; the input end of the rectifier bridge DB1 is connected with the L line of the alternating current power grid through the protection resistor FR1.
3. The constant current driving device according to claim 1, wherein the signal processing module is an integrated circuit.
4. The constant current driving device according to claim 1, wherein the duty ratio adjusting unit includes: and the grid electrode of the power tube Q2 is connected with the input end of the duty ratio adjusting unit, the drain electrode of the power tube Q2 is suitable for being electrically connected with the light emitting module, and the source electrode of the power tube Q is grounded.
5. The constant current driving device according to claim 1, wherein the current of the light emitting module includes a current amplitude and a current duty ratio;
the amplitude adjusting unit adjusts the current amplitude according to the current amplitude adjusting signal;
the duty ratio adjusting unit adjusts the current duty ratio according to the current PWM pulse width duty ratio adjusting signal.
6. The constant current driving device according to claim 5, wherein the amplitude adjustment unit adjusts the current amplitude according to the current amplitude adjustment signal specifically includes:
when the voltage amplitude of the alternating current power grid is increased, the current amplitude adjustment signal is decreased, and the current amplitude is decreased;
when the voltage amplitude of the alternating current power grid becomes smaller, the current amplitude adjusting signal becomes larger, and the current amplitude becomes larger.
7. The constant current drive apparatus according to claim 4, wherein the constant current module further comprises: the operational amplifier, the switching tube Q1 and the sampling resistor R1;
the positive input end of the operational amplifier is connected with the output end of the amplitude adjusting unit, the negative input end of the operational amplifier is connected with one end of the sampling resistor R1, and the output end of the operational amplifier is connected with the grid electrode of the switching tube Q1 and the common end of the drain electrode of the power tube Q2;
the drain electrode of the switching tube Q1 is connected with the light-emitting module, and the source electrode is connected with the negative input end of the operational amplifier and the common end of one end of the sampling resistor R1; the other end of the sampling resistor R1 is grounded.
8. A lamp comprising a light emitting module and the constant current drive device according to any one of claims 1 to 7.
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| CN201710666621.7A CN107396495B (en) | 2017-08-07 | 2017-08-07 | Constant-current driving device and lamp |
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| CN201710666621.7A CN107396495B (en) | 2017-08-07 | 2017-08-07 | Constant-current driving device and lamp |
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| CN108318719A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of stepless changing purely resistive AC load |
| CN108318847A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of purely resistive AC load of automatic constant current |
| CN113993244B (en) * | 2021-11-25 | 2024-07-23 | 深圳市火乐科技发展有限公司 | Dimming circuit and light-emitting device |
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| CN104661392A (en) * | 2013-11-25 | 2015-05-27 | 上海莱托思电子科技有限公司 | Constant-current driving circuit for LED switch |
| CN106332361A (en) * | 2016-09-20 | 2017-01-11 | 浙江阳光美加照明有限公司 | Frequency-flicker-free LED filament lamp |
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