CN114980422B - Self-adaptive constant current control circuit - Google Patents

Self-adaptive constant current control circuit Download PDF

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Publication number
CN114980422B
CN114980422B CN202210546094.7A CN202210546094A CN114980422B CN 114980422 B CN114980422 B CN 114980422B CN 202210546094 A CN202210546094 A CN 202210546094A CN 114980422 B CN114980422 B CN 114980422B
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module
capacitor
energy storage
resistor
current
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CN114980422A (en
Inventor
许方雷
何宗芬
温伟峰
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Dongfeng Liuzhou Motor Co Ltd
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Dongfeng Liuzhou Motor Co Ltd
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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a self-adaptive constant current control circuit, which comprises: the device comprises a power module, an energy storage module, a lighting control module, a current driving module and a lighting module. The power module is respectively connected with the energy storage module, the illumination control module and the illumination module. The current driving module is respectively connected with the illumination control module and the energy storage module. The illumination control module is respectively connected with the energy storage module and the illumination module. The lighting control module is used for acquiring the current of the whole self-adaptive constant current control circuit and adjusting the duty ratio of the PWM signal according to a preset rule when the current change is detected so as to control the current driving module. The current driving module adjusts the disconnection frequency of the whole self-adaptive constant current control circuit according to the duty ratio of the PWM signal output by the illumination control module, so as to adjust the power supply time length of the power supply module to the energy storage module. The energy storage module is used for adjusting the input current of the lighting module according to the internal stored electric energy so as to enable the input current of the lighting module to be constant current.

Description

Self-adaptive constant current control circuit
Technical Field
The invention relates to the field of constant current control, in particular to a self-adaptive constant current control circuit.
Background
Since the self resistance of a Light-Emitting Diode (LED) changes during operation, constant current power supply is required to be more suitable for long-time operation of the LED, and the brightness of the LED lamp is ensured to be unchanged.
The current method for ensuring constant current power supply of the LED lamp is mainly a PWM control mode, and the current of the LED lamp is stable by adjusting the pulse width of the conduction of the main circuit switching device under the conditions of input voltage, internal parameters and external load change.
However, the method cannot adaptively adjust the PWM signal when the LED lamp ages or changes in resistance, so that constant current power supply to the LED lamp cannot be continuously ensured.
Disclosure of Invention
The invention provides a self-adaptive constant current control circuit, which aims to solve the technical problem that the constant current provided for an LED lamp cannot be kept due to the change of illumination resistance caused by the aging of the LED lamp or other problems.
In order to solve the above technical problems, an embodiment of the present invention provides an adaptive constant current control circuit, including: the device comprises a power supply module, an energy storage module, an illumination control module, a current driving module and an illumination module;
the power supply module is respectively connected with the energy storage module, the illumination control module and the illumination module;
the current driving module is respectively connected with the illumination control module and the energy storage module;
the illumination control module is respectively connected with the energy storage module and the illumination module;
the lighting control module is used for acquiring the current of the whole self-adaptive constant current control circuit and adjusting the duty ratio of the PWM signal according to a preset rule when detecting the current change so as to control the current driving module;
the current driving module is used for adjusting the disconnection frequency of the whole self-adaptive constant current control circuit according to the duty ratio of the PWM signal output by the illumination control module, so as to adjust the power supply time length of the power supply module to the energy storage module;
the energy storage module is used for adjusting the input current of the lighting module according to the internal stored electric energy so as to enable the input current of the lighting module to be constant current.
Thus, after the lighting control module detects the change of the circuit current, the disconnection frequency of the circuit by the current driving module is changed by adjusting the duty ratio of the PWM signal. The charging and discharging time of the energy storage module is further adjusted, and the current of the energy storage module for supplying power to the lighting module is changed, so that the current of the lighting module is adaptively adjusted, current fluctuation is reduced, and the constant current passing through the lighting module is ensured.
The lighting control module is used for acquiring the current of the whole self-adaptive constant current control circuit and adjusting the duty ratio of the PWM signal according to a preset rule when detecting the change of the input current, and specifically comprises the following steps:
acquiring input current of the lighting module and output current of the power supply module;
when the input current of the lighting module is large and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be small;
when the input current of the lighting module is smaller and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be larger;
or when the output current of the power supply module is large and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is increased;
and when the output current of the power supply module becomes smaller and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is reduced.
Further, the current driving module is configured to adjust the disconnection frequency of the whole adaptive constant current control circuit according to the duty ratio of the PWM signal output by the lighting control module, and specifically includes:
when the PWM signal is in a high level, the current driving module controls the whole self-adaptive constant current control circuit to be communicated. When the PWM signal is in a low level, the current driving module controls the whole self-adaptive constant current control circuit to be disconnected.
The duty cycle of the PWM signal is thus adjusted according to the range of current measured by the lighting control module. And determining the time length relation between the duty ratio of the PWM signal and the disconnection of the circuit, and adjusting the power supply time length of the power supply module to the energy storage module so as to change the charge and discharge time of the energy storage module. The purpose of adaptively adjusting the current of the whole circuit is achieved, so that the current of the lighting module is in a stable state.
Further, the energy storage module comprises a first energy storage unit and a second energy storage unit. The first energy storage unit and the second energy storage unit are connected with each other through the lighting module.
The first energy storage unit is a first inductor, the second energy storage unit is a seventeenth capacitor, and a connecting circuit of the first energy storage unit and the second energy storage unit comprises a second diode, a seventh resistor, a fourth filtering magnetic bead, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor;
the first end of the first inductor of the first energy storage unit is connected with the drain electrode of the current driving module, the seventh resistor and the first end of the second diode, and the second end of the first inductor is connected with the first end of the seventeenth capacitor of the second energy storage unit and the lighting control module; the second end of the seventh resistor is connected with the first end of the twelfth capacitor, and the second end of the twelfth capacitor is connected with the power ground; the second end of the second diode is connected with the thirteenth capacitor, the fourteenth capacitor and the first end of the fourth filtering magnetic bead; the second ends of the thirteenth capacitor and the fourteenth capacitor are connected with power ground;
the second end of the fourth filtering magnetic bead is connected with the fifteenth capacitor, the sixteenth capacitor, the seventeenth capacitor in the second energy storage unit and the first end of the lighting module; the first end of the fifteenth capacitor is also connected with the second end of the seventeenth capacitor in the second energy storage unit and the first end of the lighting module; the second ends of the fifteenth capacitor and the sixteenth capacitor are connected with power ground.
The energy storage module thus comprises a first energy storage unit and a second energy storage unit. The power supply charges the first energy storage unit when the circuit is connected, the second energy storage unit supplies power to the lighting module, and the first energy storage unit charges the second energy storage unit and simultaneously supplies power to the lighting module when the circuit is disconnected. And the first energy storage unit and the second energy storage unit are mutually connected in parallel with the lighting module. The first energy storage unit is connected with the second diode in series, so that current does not pass through the first energy storage unit when the second energy storage unit discharges. And a seventh resistor, a fourth filtering magnetic bead, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor are arranged between the first energy storage unit and the second energy storage unit and are used for filtering current signals with various frequencies generated when the first energy storage unit supplies power to the second energy storage unit and the lighting module, and only specific current signals are reserved.
Further, the current driving module is respectively connected with the lighting control module and the energy storage module, and specifically comprises:
the current driving module comprises a mos tube, a fifth resistor and a third filtering magnetic bead;
wherein the mos transistor includes a gate, a drain, and a source; the grid electrode of the current driving module is connected with the first end of the fifth resistor, the drain electrode of the current driving module is connected with the energy storage module, and the source electrode of the current driving module is connected with the first end of the third filtering magnetic bead;
the second end of the fifth resistor is connected with the illumination control module, and the second end of the third filter magnetic bead is connected with the illumination control module and the first end of the sixth resistor.
Therefore, the current driving module can control the circuit disconnection frequency according to the PWM signal generated by the lighting control module, thereby achieving the purpose of adjusting the current of the lighting module.
Further, the illumination control module is respectively connected with the energy storage module and the illumination module, and specifically comprises:
the illumination control module is connected with the power supply module through an IN pin;
the illumination control module is connected with the current driving module through an SWO pin;
the illumination control module is connected with the second end of the eighth resistor and the first end of the fifth filtering magnetic bead through an FBH pin, and is connected with the first end of the eighth resistor, the power supply module and the energy storage module through an FBL pin;
the illumination control module is connected with the second end of the third filtering magnetic bead and the first end of the sixth resistor through an SWCS pin; and the illumination control module is connected with the second end of the sixth resistor and the power ground through an SGND pin.
Thus, the illumination control module transmits PWM signals to the current driving module through the SWO pins, and the current driving module is controlled to disconnect the circuit through the PWM signals. And the lighting control module obtains the voltage at two ends of the eighth resistor according to the FBH pin and the FBL pin, and can obtain the current of the lighting module according to a formula. The illumination control module obtains the power supply current through the SWCS pin and the SGND pin, and can monitor the stability of the power supply current.
Further, the lighting module includes nine light emitting units, an eighth resistor and a fifth filter magnetic bead, specifically:
each light-emitting unit comprises a diode and a corresponding voltage stabilizer, wherein each light-emitting diode is connected with the corresponding voltage stabilizer in parallel; the first end of each light emitting diode is connected with the second end of the corresponding voltage stabilizer and is the second end of the corresponding light emitting unit, and the first end of each voltage stabilizer is connected with the second end of the light emitting diode and is the first end of the corresponding light emitting unit;
the first end of the first light-emitting unit is connected with the first ends of the second light-emitting unit and the third light-emitting unit and is connected with the energy storage module; the second end of the first light-emitting unit is connected with the second light-emitting unit, and the second end of the third light-emitting unit is connected with the first ends of the fourth light-emitting unit, the fifth light-emitting unit and the sixth light-emitting unit;
the second ends of the fourth light-emitting unit, the fifth light-emitting unit and the sixth light-emitting unit are connected with the first ends of the seventh light-emitting unit, the eighth light-emitting unit and the ninth light-emitting unit;
the seventh light-emitting unit, the eighth light-emitting unit and the ninth light-emitting unit are connected with the second end of the fifth filter, and the second end of the fifth filter is connected with the second end of the eighth resistor; the first end of the eighth resistor is connected with the power module and the lighting control module.
Thus, the eighth resistor is integrally connected with the light-emitting unit in series, and the current of the lighting module can be calculated according to a formula after the voltage of the eighth resistor is measured. And the voltage stabilizing tube in the light emitting unit can be used for overvoltage protection of the light emitting diode.
Further, the power module is connected with the energy storage module, the illumination control module and the illumination module respectively, and specifically comprises:
the power supply module comprises a power supply, a first diode, a first filtering magnetic bead, a first transient voltage suppression diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the first diode is connected with a power supply, and the second end of the first diode is connected with the first end of the first transient voltage suppression diode, the first end of the first capacitor, the first end of the third capacitor and the first end of the first filtering magnetic bead;
the second end of the first transient voltage suppression diode is connected with the power ground, the second end of the first capacitor is connected with the first end of the second capacitor, and the second end of the third capacitor is connected with the power ground;
the second end of the first filtering magnetic bead is connected with the first ends of the fourth capacitor and the fifth capacitor and is connected with the lighting control module, the energy storage module, the current driving module and the lighting module;
the second end of the second capacitor is connected with power ground; and the second ends of the fourth capacitor and the fifth capacitor are connected with power ground.
Thus, the external power supply can be filtered through the first diode, the first filtering magnetic bead, the first transient voltage suppression diode, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and other devices, high pulse signals are filtered, the voltage is stabilized in a voltage range, and the lighting control module is powered.
Further, the lighting control module further comprises a PWM input pin, specifically:
the PWM input pin is connected with the signal input module;
the signal input module comprises a sixth capacitor, a seventh capacitor, a second filtering magnetic bead, an eighth capacitor, a ninth capacitor and a first resistor;
the first end of the sixth capacitor is connected with the first end of the seventh capacitor and the first end of the second filtering magnetic bead; the second end of the sixth capacitor is connected with power ground;
the second end of the seventh capacitor is connected with power ground; the second end of the second filtering magnetic bead is connected with the first end of the eighth capacitor, the first end of the ninth capacitor and the first end of the first resistor;
the second end of the eighth capacitor is connected with power ground, and the second end of the ninth capacitor is connected with power ground;
and the second end of the first resistor is connected with a PWM input pin of the illumination control module.
The lighting control module further comprises a clock input pin, an analog dimming input pin, an internal power supply input pin, an external overvoltage protection feedback pin, a compensation input pin and a state output pin.
The clock input pin is connected with the first end of the second resistor, and the second end of the second resistor is connected with the grounding pin of the lighting control module;
the analog dimming input pin is connected with the first end of a third resistor, and the second end of the third resistor is connected with the first end of a seventeenth capacitor and an internal power supply input pin of the lighting control module; the second end of the seventeenth capacitor is connected with power ground;
the compensation input pin is connected with the first end of the fourth resistor and the first end of the tenth capacitor, the second end of the tenth capacitor is connected with the power ground, and the second end of the fourth resistor is connected with the first end of the eleventh capacitor;
the second end of the eleventh capacitor is connected with power ground.
Such that the status output pin and external overvoltage protection feedback can be used to connect to external circuitry. The clock input pin, the analog dimming input pin, the internal power input pin and the compensation input pin are used for ensuring that the illumination control module completes self-adaptive constant current control on the circuit.
Drawings
Fig. 1 is a schematic block diagram of an adaptive constant current control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit connection diagram of an adaptive constant current control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a light emitting unit module of an adaptive constant current control circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first and second and the like in the description and in the claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Example 1
Referring to fig. 1, fig. 1 is a schematic block diagram of an adaptive constant current control circuit according to an embodiment of the present invention. The embodiment of the invention provides a self-adaptive constant current control circuit, which comprises: a power supply module 101, an energy storage module 102, a lighting control module 103, a current driving module 104 and a lighting module 105;
the power module 101 is connected with the energy storage module 102, the lighting control module 103 and the lighting module 105 respectively. The current driving module 104 is respectively connected with the lighting control module 103 and the energy storage module 102. The illumination control module 103 is respectively connected with the energy storage module 102 and the illumination module 105.
The lighting control module 103 is configured to obtain a current of the entire adaptive constant current control circuit, and to adjust a duty ratio of the PWM signal according to a preset rule when the current change is detected, so as to control the current driving module 104.
Preferably, the input current of the lighting module 105 and the output current of the power module 101 are obtained;
when the input current of the lighting module 105 is large and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be small. When the input current of the lighting module 105 becomes small and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be large. Alternatively, when the output current of the power module 101 is increased and the variation range is greater than a preset value, the duty ratio of the PWM signal is increased. When the output current of the power module 101 becomes smaller and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be smaller.
The current driving module 104 is configured to adjust the disconnection frequency of the entire adaptive constant current control circuit according to the duty ratio of the PWM signal output by the lighting control module 103, so as to adjust the power supply duration of the power module 101 to the energy storage module 102.
Preferably, when the PWM signal is at a high level, the current driving module 104 controls the whole adaptive constant current control circuit to be connected. When the PWM signal is low, the current driving module 104 controls the entire adaptive constant current control circuit to be turned off.
The energy storage module 102 is configured to adjust an input current of the lighting module 105 according to the internal stored electrical energy, so that the input current of the lighting module 105 is a constant current input current.
This changes the frequency of circuit disconnection by the current drive module 104 by adjusting the duty cycle of the PWM signal after the lighting control module 103 detects a change in the circuit current. And the relation between the duty ratio of the PWM signal and the time length of disconnection of the circuit is determined, the charge and discharge time of the energy storage module 102 is further adjusted, and the current of the power supply of the lighting module 105 by the energy storage module 102 is changed, so that the current of the lighting module 105 is adaptively adjusted, the current fluctuation is reduced, the purpose of adaptively adjusting the current of the whole circuit is achieved, and the current of the lighting module 105 is in a stable state.
Referring to fig. 2, fig. 2 is a schematic circuit connection diagram of an adaptive constant current control circuit according to an embodiment of the present invention. The internal specific circuit structures of the power supply module 101, the energy storage module 102, the lighting control module 103, the current driving module 104, and the lighting module 105 mentioned in fig. 1 are described in detail below.
Preferably, the adaptive constant current control circuit further comprises a signal input module 106. The signal input module 106 is connected to the lighting control module 103. The signal input module comprises a sixth capacitor, a seventh capacitor, a second filtering magnetic bead, an eighth capacitor, a ninth capacitor and a first resistor.
The energy storage module 102 includes a first energy storage unit and a second energy storage unit. The first energy storage unit and the second energy storage unit, the lighting module 105 are connected to each other.
The first energy storage unit is a first inductor L1, the second energy storage unit is a seventeenth capacitor C17, and a connection circuit between the first energy storage unit and the second energy storage unit includes a second diode D2, a seventh resistor R7, a fourth filtering magnetic bead FB4, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15 and a sixteenth capacitor C16.
A first end of a first inductor L1 of the first energy storage unit is connected with the drain electrode D of the current driving module 104, a seventh resistor R7 and a first end of a second diode D2, and a second end of the first inductor L1 is connected with a first end of a seventeenth capacitor C17 of the second energy storage unit and the lighting control module 103; the second end of the seventh resistor R7 is connected with the first end of the twelfth capacitor C12, and the second end of the twelfth capacitor C12 is connected with the power ground; the second end of the second diode D2 is connected with the thirteenth capacitor C13, the fourteenth capacitor C14 and the first end of the fourth filtering magnetic bead FB 4; the second ends of the thirteenth capacitor C13 and the fourteenth capacitor C14 are connected with power ground;
the second end of the fourth filtering magnetic bead FB4 is connected to the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17 in the second energy storage unit, and the first end of the lighting module 105; wherein the first end of the fifteenth capacitor C15 is further connected to the second end of the seventeenth capacitor C17 in the second energy storage unit and the first end of the lighting module 105; the second ends of the fifteenth capacitor C15 and the sixteenth capacitor C16 are connected to the power ground.
The energy storage module 102 thus comprises a first energy storage unit and a second energy storage unit. The power supply charges the first energy storage unit when the circuit is connected, the second energy storage unit supplies power to the lighting module 105, and the first energy storage unit charges the second energy storage unit and simultaneously supplies power to the lighting module 105 when the circuit is disconnected. And the first energy storage unit and the second energy storage unit, the lighting modules 105 are connected in parallel with each other. The first energy storage unit is connected with the second diode D2 in series, so that current does not pass through the first energy storage unit when the second energy storage unit discharges. The seventh resistor R7, the fourth filtering magnetic bead FB4, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15 and the sixteenth capacitor C16 are arranged between the first energy storage unit and the second energy storage unit and are used for filtering current signals with various frequencies generated when the first energy storage unit supplies power to the second energy storage unit and the lighting module, and only specific current signals are reserved.
The current driving module comprises a mos tube Q1, a fifth resistor R5 and a third filtering magnetic bead FB3.
Wherein mos transistor Q1 includes gate G, drain D, and source S; the gate G of the mos transistor Q1 is connected to the first end of the fifth resistor R5, the drain D is connected to the energy storage module 102, and the source S is connected to the first end of the third filter bead FB3.
The second end of the fifth resistor R5 is connected to the lighting control module 103, and the second end of the third filter bead FB3 is connected to the lighting control module 103 and the first end of the sixth resistor R6.
The lighting control module 103 is respectively connected with the energy storage module 102 and the lighting module 105, specifically:
the illumination control module 103 is connected with the power supply module 101 through an IN pin.
The illumination control module 103 is connected with the current driving module 104 through SWO pins.
The lighting control module 103 is connected to the second end of the eighth resistor R8 and the first end of the fifth filter magnetic bead FB5 through an FBH pin, and is connected to the first end of the eighth resistor R8, the power module 101, and the energy storage module 102 through an FBL pin.
The illumination control module 103 is connected with the second end of the third filtering magnetic bead FB3 and the first end of the sixth resistor R6 through a SWCS pin; the lighting control module 103 is connected to the second end of the sixth resistor R6 and the power ground through the SGND pin.
The lighting control module 103 transmits a PWM signal to the current driving module 104 through the SWO pin, and controls disconnection of the current driving module 104 from the circuit through the PWM signal. And the lighting control module 103 obtains the voltages at the two ends of the eighth resistor according to the FBH pin and the FBL pin, and can obtain the current of the lighting module 105 according to the formula. The lighting control module 103 obtains the power supply current through the SWCS pin and the SGND pin, and may also monitor the stability of the power supply current.
The model of the lighting control module 103 is TLD5097EL in a specific implementation.
The lighting module 105 comprises nine light emitting units, an eighth resistor R8 and a fifth filter bead FB5,
the internal modules of the light emitting unit refer to fig. 3.
Each light-emitting unit comprises a diode and a corresponding voltage stabilizer, wherein each light-emitting diode is connected with the corresponding voltage stabilizer in parallel; the first end of each light emitting diode is connected with the second end of the corresponding voltage stabilizer and is the second end of the corresponding light emitting unit, and the first end of each voltage stabilizer is connected with the second end of the light emitting diode and is the first end of the corresponding light emitting unit;
wherein the first end of the first light emitting unit is connected with the first ends of the second light emitting unit and the third light emitting unit and the energy storage module 102; the second end of the first light-emitting unit is connected with the second light-emitting unit, and the second end of the third light-emitting unit is connected with the first ends of the fourth light-emitting unit, the fifth light-emitting unit and the sixth light-emitting unit;
the second ends of the fourth light-emitting unit, the fifth light-emitting unit and the sixth light-emitting unit are connected with the first ends of the seventh light-emitting unit, the eighth light-emitting unit and the ninth light-emitting unit;
the second ends of the seventh light emitting unit, the eighth light emitting unit and the ninth light emitting unit are connected with the first end of a fifth filter FB5, and the second end of the fifth filter FB5 is connected with the second end of an eighth resistor R8; a first end of the eighth resistor R8 is connected to the power module 101 and the lighting control module 103.
Thus, the eighth resistor R8 is integrally connected in series with the light emitting unit, and when the voltage of the eighth resistor R8 is measured, the current of the lighting module can be calculated according to a formula. And the voltage stabilizing tube in the light emitting unit can be used for overvoltage protection of the light emitting diode.
The power module 101 is respectively connected with the energy storage module 102, the lighting control module 103 and the lighting module 105, specifically:
the power module 101 includes a power supply, a first diode D1, a first filter bead FB1, a first transient voltage suppression diode T1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5.
Wherein in a specific implementation the power source is 24V dc.
The first end of the first diode D1 is connected to a power supply, and the second end of the first diode D1 is connected to the first end of the first transient voltage suppression diode T1, the first end of the first capacitor C1, the first end of the third capacitor C3, and the first end of the first filter bead FB 1.
The second end of the first transient voltage suppression diode T1 is connected with the power ground, the second end of the first capacitor C1 is connected with the first end of the second capacitor C2, and the second end of the third capacitor C3 is connected with the power ground.
The second end of the first filtering magnetic bead FB1 is connected to the first ends of the fourth capacitor C4 and the fifth capacitor C5, and is connected to the lighting control module 103, the energy storage module 102, the current driving module 104 and the lighting module 105. The second end of the second capacitor C2 is connected with power ground; the second ends of the fourth capacitor C4 and the fifth capacitor C5 are connected with power ground.
In this way, the external power supply can be filtered through the first diode D1, the first filtering magnetic bead FB1, the first transient voltage suppression diode T1, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and other devices, the high pulse signal is filtered, the voltage is stabilized in a voltage range, and the lighting control module 103 is powered.
The lighting control module 103 further includes PWM input pins, specifically:
the PWM input pin is connected to the signal input module 106.
The signal input module 106 includes a sixth capacitor C6, a seventh capacitor C7, a second filter bead FB2, an eighth capacitor C8, a ninth capacitor C9, and a first resistor R1.
The first end of the sixth capacitor C6 is connected with the first end of the seventh capacitor C7 and the first end of the second filtering magnetic bead FB 2; the second end of the sixth capacitor C6 is connected to the power ground. The second end of the seventh capacitor C7 is connected with power ground; the second end of the second filtering magnetic bead FB2 is connected to the first end of the eighth capacitor C8, the first end of the ninth capacitor C9, and the first end of the first resistor R1. A second end of the eighth capacitor C8 is connected to the power ground, and a second end of the ninth capacitor C9 is connected to the power ground. A second end of the first resistor R1 is connected to a PWM input pin of the lighting control module 103.
The lighting control module 103 comprises a clock input pin, a grounding pin, an analog dimming input pin, an internal power input pin, an external overvoltage protection feedback pin, a compensation input pin and a state output pin;
the clock input pin is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the ground pin of the lighting control module 103.
The analog dimming input pin is connected to a first end of a third resistor R3, and a second end of the third resistor R3 is connected to a first end of a seventeenth capacitor C17 and an internal power input pin of the lighting control module 103; a second end of the seventeenth capacitor C17 is connected to the power ground.
The compensation input pin is connected with the first end of the fourth resistor R4 and the first end of the tenth capacitor C10, the second end of the tenth capacitor C10 is connected with the power ground, and the second end of the fourth resistor R4 is connected with the first end of the eleventh capacitor C11. A second end of the eleventh capacitor C11 is connected to the power ground.
Such that the status output pin and external overvoltage protection feedback can be used to connect to external circuitry. The clock input pin, the analog dimming input pin, the internal power input pin and the compensation input pin are used for ensuring that the lighting control module 103 completes self-adaptive constant current control on the circuit.
The embodiment of the invention provides a self-adaptive constant current circuit, which changes the disconnection frequency of a current driving module 104 to a circuit by adjusting the duty ratio of a PWM signal after the lighting control module 103 detects the current change of the circuit. Further adjusting the charge and discharge time of the energy storage module 102, and changing the current of the energy storage module 102 for supplying power to the lighting module 105. Thereby adaptively adjusting the current level of the lighting module, reducing current fluctuation, and ensuring constant current passing through the lighting module 105.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.

Claims (6)

1. An adaptive constant current control circuit, comprising: the device comprises a power supply module, an energy storage module, an illumination control module, a current driving module and an illumination module;
the power supply module is respectively connected with the energy storage module, the illumination control module and the illumination module;
the current driving module is respectively connected with the illumination control module and the energy storage module;
the illumination control module is respectively connected with the energy storage module, the illumination module, the current driving module and the power supply module;
the lighting control module is used for acquiring the current of the whole self-adaptive constant current control circuit and adjusting the duty ratio of the PWM signal according to a preset rule when detecting the current change so as to control the current driving module;
the current driving module is used for adjusting the disconnection frequency of the whole self-adaptive constant current control circuit according to the duty ratio of the PWM signal output by the illumination control module, so as to adjust the power supply time length of the power supply module to the energy storage module;
the energy storage module is used for adjusting the input current of the lighting module according to the internal stored electric energy so as to enable the input current of the lighting module to be constant current input current;
the energy storage module includes: a first energy storage unit and a second energy storage unit;
the first energy storage unit and the second energy storage unit are connected with the lighting module;
the first energy storage unit is a first inductor, the second energy storage unit is a seventeenth capacitor, and a connecting circuit of the first energy storage unit and the second energy storage unit comprises a second diode, a seventh resistor, a fourth filtering magnetic bead, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor;
the first end of the first inductor of the first energy storage unit is connected with the drain electrode of the current driving module, the seventh resistor and the first end of the second diode, and the second end of the first inductor is connected with the first end of the seventeenth capacitor of the second energy storage unit and the lighting control module; the second end of the seventh resistor is connected with the first end of the twelfth capacitor, and the second end of the twelfth capacitor is connected with the power ground; the second end of the second diode is connected with the thirteenth capacitor, the fourteenth capacitor and the first end of the fourth filtering magnetic bead; the second ends of the thirteenth capacitor and the fourteenth capacitor are connected with power ground;
the second end of the fourth filtering magnetic bead is connected with the first end of the lighting module; the second end of the fourth filtering magnetic bead is connected with the second end of the seventeenth capacitor in the second energy storage unit; the first end of the fifteenth capacitor is also connected with the second end of the seventeenth capacitor in the second energy storage unit and the first end of the lighting module; the second ends of the fifteenth capacitor and the sixteenth capacitor are connected with power ground;
the lighting module comprises nine lighting units, an eighth resistor and a fifth filtering magnetic bead, and specifically comprises:
each light-emitting unit comprises a diode and a corresponding voltage stabilizer, wherein each light-emitting diode is connected with the corresponding voltage stabilizer in parallel;
the first end of each light emitting diode is connected with the second end of the corresponding voltage stabilizer and corresponds to the second end of the corresponding light emitting unit, and the first end of each voltage stabilizer is connected with the second end of the corresponding light emitting diode and corresponds to the first end of the corresponding light emitting unit;
the first end of the first light-emitting unit is connected with the first ends of the second light-emitting unit and the third light-emitting unit and is connected with the energy storage module; the second end of the first light-emitting unit is connected with the second ends of the second light-emitting unit and the third light-emitting unit, and is connected with the first ends of the fourth light-emitting unit, the fifth light-emitting unit and the sixth light-emitting unit;
the second ends of the fourth light-emitting unit, the fifth light-emitting unit and the sixth light-emitting unit are connected with the first ends of the seventh light-emitting unit, the eighth light-emitting unit and the ninth light-emitting unit;
the second ends of the seventh light-emitting unit, the eighth light-emitting unit and the ninth light-emitting unit are connected with the second end of the fifth filter magnetic bead, and the first end of the fifth filter magnetic bead is connected with the second end of the eighth resistor; the first end of the eighth resistor is connected with the power supply module and the illumination control module;
the current driving module is respectively connected with the illumination control module and the energy storage module, and specifically comprises:
the current driving module comprises a mos tube, a fifth resistor and a third filtering magnetic bead;
wherein the mos transistor includes a gate, a drain, and a source; the grid electrode of the current driving module is connected with the first end of the fifth resistor, the drain electrode of the current driving module is connected with the energy storage module, and the source electrode of the current driving module is connected with the first end of the third filtering magnetic bead;
the second end of the fifth resistor is connected with the illumination control module, and the second end of the third filter magnetic bead is connected with the illumination control module and the first end of the sixth resistor;
the lighting control module is respectively connected with the energy storage module, the lighting module, the current driving module and the power module, and specifically comprises:
the illumination control module is connected with the power supply module through an IN pin;
the illumination control module is connected with the current driving module through an SWO pin;
the illumination control module is connected with the second end of the eighth resistor and the first end of the fifth filtering magnetic bead through an FBH pin, and is connected with the first end of the eighth resistor, the power supply module and the energy storage module through an FBL pin;
the illumination control module is connected with the second end of the third filtering magnetic bead and the first end of the sixth resistor through an SWCS pin; and the illumination control module is connected with the second end of the sixth resistor and the power ground through an SGND pin.
2. The adaptive constant current control circuit according to claim 1, wherein the lighting control module is configured to obtain a current of the entire adaptive constant current control circuit, and to adjust a duty cycle of the PWM signal according to a preset rule when the input current is detected to change, specifically:
acquiring input current of the lighting module and output current of the power supply module;
when the input current of the lighting module is large and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be small; when the input current of the lighting module is smaller and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is adjusted to be larger;
or when the output current of the power supply module is large and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is increased; and when the output current of the power supply module becomes smaller and the variation amplitude is larger than a preset value, the duty ratio of the PWM signal is reduced.
3. The adaptive constant current control circuit according to claim 2, wherein the current driving module is configured to adjust a disconnection frequency of the adaptive constant current control circuit according to a duty ratio of the PWM signal output by the lighting control module, specifically:
when the PWM signal is in a high level, the current driving module controls the whole self-adaptive constant current control circuit to be communicated; when the PWM signal is in a low level, the current driving module controls the whole self-adaptive constant current control circuit to be disconnected.
4. The self-adaptive constant current control circuit according to claim 1, wherein the power supply module is respectively connected with the energy storage module, the illumination control module and the illumination module, specifically:
the power supply module comprises a power supply, a first diode, a first filtering magnetic bead, a first transient voltage suppression diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the first diode is connected with a power supply, and the second end of the first diode is connected with the first end of the first transient voltage suppression diode, the first end of the first capacitor, the first end of the third capacitor and the first end of the first filtering magnetic bead;
the second end of the first transient voltage suppression diode is connected with the power ground, the second end of the first capacitor is connected with the first end of the second capacitor, and the second end of the third capacitor is connected with the power ground;
the second end of the first filtering magnetic bead is connected with the first ends of the fourth capacitor and the fifth capacitor and is connected with the lighting control module, the energy storage module, the current driving module and the lighting module;
the second end of the second capacitor is connected with power ground; and the second ends of the fourth capacitor and the fifth capacitor are connected with power ground.
5. The adaptive constant current control circuit according to claim 1, wherein the lighting control module further comprises a PWM input pin, specifically:
the PWM input pin is connected with the signal input module;
the signal input module comprises a sixth capacitor, a seventh capacitor, a second filtering magnetic bead, an eighth capacitor, a ninth capacitor and a first resistor;
the first end of the sixth capacitor is connected with the first end of the seventh capacitor and the first end of the second filtering magnetic bead; the second end of the sixth capacitor is connected with power ground;
the second end of the seventh capacitor is connected with power ground; the second end of the second filtering magnetic bead is connected with the first end of the eighth capacitor, the first end of the ninth capacitor and the first end of the first resistor;
the second end of the eighth capacitor is connected with power ground, and the second end of the ninth capacitor is connected with power ground;
and the second end of the first resistor is connected with a PWM input pin of the illumination control module.
6. The adaptive constant current control circuit of claim 1, wherein the lighting control module further comprises a clock input pin, a ground pin, an analog dimming input pin, an internal power input pin, an external overvoltage protection feedback pin, a compensation input pin, and a status output pin;
the clock input pin is connected with the first end of the second resistor, and the second end of the second resistor is connected with the grounding pin of the lighting control module;
the analog dimming input pin is connected with the first end of a third resistor, and the second end of the third resistor is connected with the first end of a nineteenth capacitor and the internal power supply input pin of the lighting control module; the second end of the nineteenth capacitor is connected with power ground;
the compensation input pin is connected with the first end of the fourth resistor and the first end of the tenth capacitor, the second end of the tenth capacitor is connected with the power ground, and the second end of the fourth resistor is connected with the first end of the eleventh capacitor;
the second end of the eleventh capacitor is connected with power ground.
CN202210546094.7A 2022-05-19 2022-05-19 Self-adaptive constant current control circuit Active CN114980422B (en)

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CN105517250A (en) * 2016-01-20 2016-04-20 深圳创维－Rgb电子有限公司 LED (Light-emitting Diode) constant current drive system and constant current control circuit thereof
CN106535390A (en) * 2016-10-09 2017-03-22 深圳创维－Rgb电子有限公司 Constant current driving power supply and display equipment
CN214799977U (en) * 2021-01-28 2021-11-19 漳州立达信光电子科技有限公司 Constant current drive circuit, constant current drive device and lamp
CN113993244A (en) * 2021-11-25 2022-01-28 深圳市火乐科技发展有限公司 Dimming circuit and light emitting device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114828332A (en) * 2021-01-28 2022-07-29 漳州立达信光电子科技有限公司 Constant current drive circuit, constant current drive device and lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105517250A (en) * 2016-01-20 2016-04-20 深圳创维－Rgb电子有限公司 LED (Light-emitting Diode) constant current drive system and constant current control circuit thereof
CN106535390A (en) * 2016-10-09 2017-03-22 深圳创维－Rgb电子有限公司 Constant current driving power supply and display equipment
CN214799977U (en) * 2021-01-28 2021-11-19 漳州立达信光电子科技有限公司 Constant current drive circuit, constant current drive device and lamp
CN113993244A (en) * 2021-11-25 2022-01-28 深圳市火乐科技发展有限公司 Dimming circuit and light emitting device

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