CN219577308U - LED dimming circuit and LED lamp - Google Patents
LED dimming circuit and LED lamp Download PDFInfo
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- CN219577308U CN219577308U CN202223330378.7U CN202223330378U CN219577308U CN 219577308 U CN219577308 U CN 219577308U CN 202223330378 U CN202223330378 U CN 202223330378U CN 219577308 U CN219577308 U CN 219577308U
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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model relates to the technical field of illumination, and discloses an LED dimming circuit and an LED lamp. The LED dimming circuit comprises a rectifying module, a main control module and a first setting module; the rectification module is provided with a first live wire input end, a second live wire input end and a zero line input end, is connected with external alternating current, and converts the external alternating current into high-voltage direct current suitable for the LED dimming circuit to be output; the main control module is connected with the rectifying module, is connected with the high-voltage direct current output by the rectifying module, and converts the high-voltage direct current into a load power supply suitable for the LED load to output; the first setting module is connected with the first live wire input end and the main control module, and adjusts a current sampling value of the main control module when external alternating current introduced by the first live wire input end is accessed, so that the main control module adjusts current flowing through the LED load according to the current sampling value. According to the embodiment of the utility model, a silicon controlled rectifier dimmer is not required, so that the driving energy consumption is reduced, and the compatibility of the application scene is improved.
Description
Technical Field
The utility model relates to the technical field of illumination, in particular to an LED dimming circuit and an LED lamp.
Background
With the rapid development of intelligent illumination technology, LED intelligent illumination gradually becomes the main stream of green illumination. At present, most of the LED lamps on the market belong to conventional series, are mainly used for illumination, have single functions, however, along with the enhancement of energy conservation and environmental protection consciousness, the LED lamps with the dimming function are the main demands of people.
At present, three dimming modes of the LED lamp in the market are as follows: analog dimming, PWM dimming, and thyristor dimming. The silicon controlled rectifier dimming circuit is simple and easy to operate, dimming is carried out on the LED instead of a lamp, and the original dimming circuit does not need to be changed, so that the dimming mode is generally good.
However, the scr dimmer circuit needs to be connected to a scr dimmer, and the scr dimmer circuit cannot be used if a dimmer interface is not configured in a use scenario, and in addition, the conduction angle of the scr is changed based on the energy storage capacitor and the resistor, so that the overall energy efficiency of the dimmer circuit is reduced.
Disclosure of Invention
The utility model aims to provide an LED dimming circuit and an LED lamp, and aims to solve the technical problem of how to improve the overall energy efficiency reduction of the dimming circuit.
In a first aspect, there is provided an LED dimmer circuit comprising:
the rectification module is provided with a first live wire input end, a second live wire input end and a zero line input end, is connected with external alternating current, and converts the external alternating current into high-voltage direct current suitable for the LED dimming circuit to be output;
the main control module is connected with the rectifying module, is connected with the high-voltage direct current output by the rectifying module, and converts the high-voltage direct current into a load power supply suitable for the LED load to output;
the first setting module is connected with the first live wire input end and the main control module, and adjusts a current sampling value of the main control module when external alternating current introduced by the first live wire input end is accessed, so that the main control module adjusts current flowing through the LED load according to the current sampling value.
Preferably, the rectifying module comprises a first rectifying unit, a second rectifying unit and an input filtering unit;
the input end of the first rectifying unit is connected with the first live wire input end and the zero wire input end, the output end of the first rectifying unit is connected with the input end of the input filtering unit, and the output end of the input filtering unit is connected with the main control module; the input end of the second rectifying unit is connected with the input end of the second live wire, and the output end of the second rectifying unit is connected with the input end of the input filtering unit.
Preferably, the first setting module includes a first setting unit and a first switching unit;
one end of the first setting unit is connected with the main control module, and the other end of the first setting unit is grounded; the first switch unit is connected with the first setting unit in parallel and is connected with the first live wire input end, and is conducted and short-circuited when the first live wire input end is accessed to external alternating current.
Preferably, the main control module comprises a power chip, a chip starting unit, a current setting unit and a driving unit;
the power chip is respectively connected with the chip starting unit, the current setting unit and the driving unit, the input end of the driving unit is the input end of the main control module, and the output end of the driving unit is the output end of the main control module.
Preferably, the power supply chip is a BOOST driving chip, and the power supply chip is provided with a chip power supply pin, a driving pin and a current sampling pin;
the chip power supply pin is connected with the driving unit through the chip starting unit and is powered from the rectifying module through the driving unit; the driving pin is connected with the driving unit; the current sampling pin is connected with one end of the current setting unit, and the other end of the current setting unit is grounded through the first setting module.
Preferably, the main control module further comprises an overvoltage detection unit, a temperature monitoring unit and a conduction setting unit, and the power chip is further provided with an overvoltage protection pin, a temperature monitoring pin and a conduction setting pin;
the overvoltage protection pin is connected with the driving unit and the LED load through the overvoltage detection unit; the temperature monitoring pin is connected with the temperature monitoring unit; the conduction setting pin is connected with the conduction setting unit.
Preferably, the LED dimming circuit further comprises:
the second setting module is connected with the second live wire input end and the main control module and adjusts a current sampling value of the main control module when the external alternating current introduced by the second live wire input end is accessed.
Preferably, the first setting module and the second setting module are connected in series and then connected with the main control module; or the first setting module and the second setting module are connected in parallel and then connected with the main control module.
Preferably, the second setting module includes a second setting unit and a second switching unit;
one end of the second setting unit is connected with the main control module, and the other end of the second setting unit is grounded or grounded through the first setting module; and the second switch unit is connected with the second setting unit in parallel and is connected with the second live wire input end, and is conducted and short-circuited when the second live wire input end is connected with external alternating current.
In a second aspect, there is provided an LED lamp comprising the LED dimming circuit of the first aspect.
The utility model has the beneficial effects that: through setting up first setting module and multiunit input, use the input combination that corresponds to introduce the alternating current commercial power according to the demand of adjusting luminance, on the basis of using the alternating current commercial power of introducing and finally converting into the load power that is used for driving the LED load, inflow alternating current commercial power starts first setting module simultaneously, adjust the current sampling value of main control module through the first setting module after starting, make main control module adjust the electric current that flows through the LED load according to the current sampling value after adjusting, thereby adjust luminance to the LED load, need not to use the silicon controlled rectifier dimmer, reduce the drive energy consumption, improve the compatibility to applicable scene.
Drawings
Fig. 1 is a schematic diagram of an LED driving circuit according to a first embodiment of the present utility model.
Fig. 2 is a schematic structural diagram of an LED driving circuit according to a second embodiment of the present utility model.
Fig. 3 is a schematic structural diagram of an LED driving circuit according to a third embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the present utility model will be further described with reference to the embodiments and the accompanying drawings.
In the description of the present utility model, the meaning of a number is not quantitative, and the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that elements are listed and may include other elements not expressly listed.
Dimming has been a focus of attention in the field of LED lighting, i.e. dimming, i.e. adjusting the brightness of a light source. For LED dimming, two main solutions are to linearly adjust the current of the LED (analog dimming) or to switch the driving current back and forth from 0 to the target current value at high frequencies (digital dimming). Setting the input current using thyristor dimming is the simplest method to implement analog dimming, and the principle of thyristor dimming is: when the input voltage reaches or exceeds the positive trigger voltage of the silicon controlled G electrode, the silicon controlled rectifier is conducted at the front edge of each AC voltage, when the current of the silicon controlled rectifier is reduced below the maintaining current of the silicon controlled rectifier, the silicon controlled rectifier is turned off, and the silicon controlled rectifier is turned off and can be turned on again after the input voltage reaches or exceeds the positive trigger voltage of the silicon controlled rectifier G electrode again, the capacitor is set to charge and discharge to regulate the change of the input voltage and the charging speed of the capacitor is regulated through the resistor, and the phase angle of the conduction of the silicon controlled rectifier can be changed, so that dimming is realized.
However, the scr dimmer circuit needs to be connected to a scr dimmer, and the scr dimmer circuit cannot be used if a dimmer interface is not configured in a use scenario, and in addition, the conduction angle of the scr is changed based on the energy storage capacitor and the resistor, so that the overall energy efficiency of the dimmer circuit is reduced.
Based on the above, the utility model provides the LED dimming circuit and the LED lamp, wherein alternating current commercial power is introduced through different input ends, and the current sampling value of the dimming circuit is changed, so that the dimming circuit adjusts the current flowing through an LED load according to the current sampling value, thereby realizing dimming, and having high compatibility and high overall energy consumption.
According to a first aspect of the present utility model, there is provided an LED dimmer circuit.
As shown in fig. 1, in an embodiment, the LED dimming circuit includes a rectifying module 1, a main control module 2, and a first setting module 3. The rectifying module 1 is provided with a first live wire input end L1, a second live wire input end L2 and a zero line input end N, the main control module 2 is connected with the rectifying module 1, and the first setting module 3 is connected with the first live wire input end L1 and the main control module 2.
When the LED load control device works, the rectification module 1 is connected with external alternating current, the external alternating current is converted into high-voltage direct current which is suitable for an LED dimming circuit, the main control module 2 is connected with the high-voltage direct current which is output by the rectification module 1, the high-voltage direct current is converted into load power supply which is suitable for an LED load, and the current sampling value of the main control module 2 is adjusted when the first setting module 3 is connected with the external alternating current which is introduced by the first live wire input end L1, so that the main control module 2 adjusts the current flowing through the LED load according to the current sampling value.
When the rectification module 1 is connected with external alternating current, the rectification module 1 is connected with a live wire through a first live wire input end L1 and is connected with a zero wire through a zero wire input end N, or is connected with a live wire through a second live wire input end L2 and is connected with the zero wire through the zero wire input end N, and the rectification module 1 is connected with alternating current commercial power and rectifies the alternating current commercial power to obtain high-voltage direct current and outputs the high-voltage direct current to the main control module 2.
The main control module 2 is connected with high-voltage direct current and started, converts the high-voltage direct current into a load power supply and outputs the load power supply to the LED load, samples the current of the LED load and obtains a current sampling value, and adjusts the current flowing through the LED load according to the current sampling value to enable the current of the LED load to be constant and drive the LED load with constant current.
When the rectifying module 1 uses the second live wire input end L2 and the zero line input end N to access alternating current commercial power, the first setting module 3 cannot access external alternating current, and the main control module 2 adjusts current flowing through the LED load according to a current sampling value obtained by sampling the current of the LED load; when the rectifying module 1 uses the first live wire input end L1 and the zero line input end N to access alternating current commercial power, one part of live wire alternating current half-wave voltage accessed by the first live wire input end L1 is converted into direct current high voltage after rectification and is output to the main control module 2, the other part of live wire alternating current half-wave voltage is accessed to the first setting module 3 and triggers the first setting module 3 to start, the first setting module 3 after starting adjusts a current sampling value of the main control module 2, and the main control module 2 adjusts current flowing through an LED load after detecting the adjusted current sampling value, so that the LED load is dimmed.
It should be noted that, switching devices such as a dial switch may be used to select to connect the first live wire input end L1 to the live wire or connect the second live wire input end L2 to the live wire, where the first live wire input end L1 and the second live wire input end L2 are connected to the live wire through the dial switch, and whether the first live wire input end L1 or the second live wire input end L2 is connected to the live wire is determined by adjusting the gear of the dial switch.
Therefore, the LED dimming circuit introduces alternating current commercial power by setting the first setting module 3 and multiple groups of input ends and using corresponding input end combinations according to dimming requirements, on the basis of using the introduced alternating current commercial power and finally converting the introduced alternating current commercial power into a load power source for driving an LED load, the alternating current commercial power flows into the alternating current commercial power to start the first setting module 3, and the current sampling value of the main control module 2 is regulated by the first setting module 3 after starting, so that the main control module 2 regulates the current flowing through the LED load according to the regulated current sampling value, thereby dimming the LED load without using a silicon controlled dimmer, reducing driving energy consumption and improving compatibility to applicable scenes.
The present utility model will be described in further detail with reference to specific examples.
As shown in fig. 2, in an embodiment, the rectifying module 1 includes a first rectifying unit, a second rectifying unit, and an input filtering unit.
The input end of the first rectifying unit is connected with the first live wire input end L1 and the zero line input end N, the output end of the first rectifying unit is connected with the input end of the input filtering unit, and the output end of the input filtering unit is connected with the main control module 2; the input end of the second rectifying unit is connected with the second live wire input end L2, and the output end of the second rectifying unit is connected with the input end of the input filtering unit.
The first rectifying unit and the second rectifying unit are respectively used for converting the accessed alternating current commercial power into high-voltage direct current, and the input filtering unit is used for filtering alternating current interference signals in the high-voltage direct current.
The first rectifying unit includes a rectifying bridge BD1.
The rectifying bridge BD1 is provided with a first rectifying input end, a second rectifying input end, a first rectifying output end and a second rectifying output end; the first rectification input end is connected with the first live wire input end L1 through a fuse, the second rectification input end is connected with the zero line input end N, the first rectification output end is connected with the input end of the input filtering unit, and the second rectification output end is grounded.
The second rectifying unit includes a first diode D1 and a second diode D2.
The anode of the first diode D1 and the cathode of the second diode D2 are connected with the first live wire input end L1 through a fuse, the cathode of the first diode D1 is connected with the input end of the input filter unit, and the anode of the second diode D2 is grounded. The input filtering unit comprises a first inductor L1, a first resistor R1, a first capacitor C1, a second capacitor C2 and a piezoresistor VR1; the voltage-dependent resistor is characterized in that a CLC filter structure is formed by a first inductor L1, a first capacitor C1 and a second capacitor C2, the CLC filter structure is used for filtering alternating current interference signals in high-voltage direct current, a first resistor R1 is connected with the first inductor L1 in parallel, the first resistor R1 is used for discharging electric energy of the first inductor L1, one end of a voltage dependent resistor VR1 is connected with the output end of a first rectifying unit and the output end of a second rectifying unit, the other end of the voltage dependent resistor VR1 is grounded, and the voltage dependent resistor VR1 is used for carrying out voltage clamping and absorbing redundant current when a circuit bears overvoltage.
When the device works, 220V alternating current commercial power is converted into high-voltage direct current after being rectified by the first rectifying unit and/or the second rectifying unit, then the high-voltage direct current is input into the filtering unit of the CLC filtering network, and finally relatively stable high-voltage direct current is output.
As shown in fig. 2, in an embodiment, the first setting module 3 includes a first setting unit and a first switching unit.
One end of the first setting unit is connected with the main control module 2, and the other end of the first setting unit is grounded; the first switch unit is connected with the first setting unit in parallel and is connected with the first live wire input end L1, and the first setting unit is conducted and short-circuited when the first live wire input end L1 is connected with external alternating current.
The first setting unit is used for adjusting a current sampling signal of the main control module 2 by connecting the main control module 2, and the first switching unit is used for changing the access state of the first setting unit so that the first setting unit is accessed to the main control module 2 or short-circuits the first setting unit so that the first setting unit cannot be accessed to the main control module 2.
The first setting unit comprises a first current sampling resistor RS1, one end of the first current sampling resistor RS1 is connected with a current sampling end of the main control module 2, and the other end of the first current sampling resistor RS1 is grounded.
The first switch unit comprises a third diode D3, a second resistor R2, a third resistor R3, a first voltage stabilizing tube ZD1, a third capacitor C3 and a first MOS tube Q1; the anode of the third diode D3 is connected with the first live wire input end L1, the cathode of the third diode D3 is connected with the grid electrode of the first MOS tube Q1 through the second resistor R2, the drain electrode of the first MOS tube Q1 is connected with one end of the first current sampling resistor RS1 connected with the main control module 2, the source electrode of the first MOS tube Q1 is connected with one end of the first current sampling resistor RS1 grounded, the cathode of the first voltage stabilizing tube ZD1, one end of the third resistor R3 and one end of the third capacitor C3 are respectively connected with the grid electrode of the first MOS tube Q1, and the anode of the first voltage stabilizing tube ZD1, the other end of the third resistor R3, the other end of the third capacitor C3 and the source electrode of the first MOS tube Q1 are respectively grounded.
The third diode D3 is configured to rectify an ac mains input at the first live wire input end L1, the second resistor R2 is configured to divide a voltage of a high-voltage dc obtained after rectification, the first MOS transistor Q1 is configured to short-circuit the first current sampling resistor RS1 when being electrically connected, so that the first current sampling resistor RS1 cannot be connected to the main control module 2, the third resistor R3 is used as a bias resistor of the first MOS transistor Q1, the first voltage regulator ZD1 is configured to provide voltage-stabilizing protection, and the third capacitor C3 plays a role of filtering.
When the intelligent dimming control device works, when the first current sampling resistor RS1 is connected to the main control module 2, the resistance value of the external resistor of the current sampling end of the main control module 2 is changed, so that a current sampling signal received by the main control module 2 is regulated, the main control module 2 regulates the current of the output load power supply, the first switch unit is connected to the alternating current mains supply introduced by the first live wire input end L1, the alternating current mains supply is converted into direct current suitable for driving the first MOS tube Q1 through the third diode D3 and the second resistor R2, the first MOS tube Q1 is conducted and the first current sampling resistor RS1 is short-circuited, the first current sampling resistor RS1 is not connected to the main control module 2, the resistance value of the external resistor of the current sampling end of the main control module 2 is recovered to a preset range, and the current of the load power supply output by the main control module 2 is recovered to the preset range, so that two-stage dimming is realized.
As shown in fig. 2, in an embodiment, the main control module 2 includes a power chip U1, a chip start unit, a current setting unit, a driving unit, an overvoltage detection unit, a temperature monitoring unit, and a conduction setting unit. The power chip U1 is respectively connected with the chip starting unit, the current setting unit, the driving unit, the overvoltage detection unit, the temperature monitoring unit and the conduction setting unit, the input end of the driving unit is the input end of the main control module 2, and the output end of the driving unit is the output end of the main control module 2.
In this embodiment, the power chip U1 is a BOOST driving chip, and the power chip U1 is provided with a chip power supply pin HV, a driving pin GATE, a current sampling pin CS, an overvoltage protection pin OVP, a temperature monitoring pin RTH and a conduction setting pin TMAX. Preferably, the power chip U1 may be a chip with a model number BP3278, but not limited thereto, and a suitable model number may be selected according to practical situations.
The chip power supply pin HV is connected with the driving unit through the chip starting unit, and electricity is taken from the rectifying module 1 through the driving unit; the drive pin GATE is connected with the drive unit; the current sampling pin CS is connected with one end of the current setting unit, and the other end of the current setting unit is grounded through the first setting module 3.
The chip starting unit comprises a fourth resistor R4 and a fourth capacitor C4. The fourth resistor R4 is used for dividing and limiting voltage when the high-voltage direct current supplies power to the chip power supply pin HV, and the fourth capacitor C4 is used for stabilizing voltage on the chip power supply pin HV.
The current setting unit includes a third current sampling resistor RS3. One end of the third current sampling resistor RS3 is connected with the current sampling pin CS, the other end of the third current sampling resistor RS3 is connected with the first current sampling resistor RS1 and the drain electrode of the first MOS tube Q1, the drain electrode of the first MOS tube Q1 is grounded through the first current sampling resistor RS1 when turned off, the drain electrode of the first MOS tube Q1 is grounded through the first MOS tube Q1 when turned on, and the third current sampling resistor RS3 is used for setting a current sampling signal of the power chip U1 so as to regulate the current of a load power supply.
The overvoltage detection unit comprises a fifth resistor R5, a sixth resistor R6 and a fifth capacitor C5, the fifth resistor R5 and the sixth resistor R6 are divided and used for detecting the voltage of a load power supply output by the main control module 2, and the fifth capacitor C5 is used for filtering alternating current interference signals of an overvoltage protection pin OVP.
The driving unit includes a first energy storage inductor T1, a third MOS transistor Q3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a sixth capacitor C6, a seventh capacitor C7, and a first electrolytic capacitor CE1.
The eighth resistor R8 and the ninth resistor R9 are used for limiting current of the gate of the third MOS transistor Q3, the sixth diode D6 is used for increasing the switching speed of the third MOS transistor Q3, the tenth resistor R10 is used as a bias resistor of the third MOS transistor Q3 and is used for providing a relatively low impedance path to protect the gate and the source of the third MOS transistor Q3, the first energy storage inductor T1 and the first electrolytic capacitor CE1 are used for storing electric energy when the third MOS transistor Q3 is turned on and releasing electric energy when the third MOS transistor Q3 is turned off, the fourth diode D4 is used for releasing energy for the energy storage inductor T1 to the LED load when the third MOS transistor Q3 is turned off, the fifth diode D5 is used for supplying power to the LED load when the first energy storage inductor T1 and the first electrolytic capacitor CE1 are not fully storing energy, the electric quantity of the first energy storage inductor T1 and the third MOS transistor Q3 are accelerated, the sixth capacitor C6 is used for providing a circuit for high frequency noise generated by the fourth diode D4 and the third MOS transistor Q3 to reduce consumption, the seventh diode D4 and the seventh diode D7 is used for filtering out a peak voltage of the fourth diode D7 and the seventh resistor R11.
The overvoltage protection pin OVP is connected with the driving unit and the LED load through the overvoltage detection unit; the temperature monitoring pin RTH is connected with the temperature monitoring unit; the conduction setting pin TMAX is connected to the conduction setting unit.
The temperature monitoring unit includes a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14. One end of the twelfth resistor R12 and one end of the thirteenth resistor R13 are respectively connected with the temperature monitoring pin RTH, the other end of the thirteenth resistor R13 is connected with one end of the fourteenth resistor R14, the other end of the twelfth resistor R12 and the other end of the fourteenth resistor R14 are grounded, and the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 are used for setting over-temperature protection points of the power chip U1 so as to prevent over-temperature of the power chip U1.
The conduction setting unit comprises a fifteenth resistor R15, one end of the fifteenth resistor R15 is connected with a conduction setting pin TMAX, the other end of the fifteenth resistor R15 is grounded, and the fifteenth resistor R15 is used for setting the maximum conduction time when the power chip U1 drives the third MOS tube Q3.
As shown in fig. 3, in an embodiment, the LED dimming circuit further comprises a second setting module 4. The second setting module 4 is connected with the second live wire input end L2 and the main control module 2, and adjusts a current sampling value of the main control module 2 when external alternating current introduced by the second live wire input end L2 is accessed.
In this embodiment, the first setting module 3 and the second setting module 4 are connected in series and then connected with the main control module 2.
When the rectifying module 1 uses the first live wire input end L1 and the zero line input end N to access alternating current commercial power, one part of live wire alternating current half-wave voltage accessed by the first live wire input end L1 is converted into direct current high voltage after rectification and is output to the main control module 2, the other part of live wire alternating current half-wave voltage is accessed to the first setting module 3 and triggers the first setting module 3 to start, the first setting module 3 after starting adjusts a current sampling value of the main control module 2, the main control module 2 detects the adjusted current sampling value and then adjusts current flowing through an LED load, and first dimming is carried out on the LED load.
When the rectifying module 1 uses the second live wire input end L2 and the zero line input end N to access alternating current commercial power, one part of live wire alternating current half-wave voltage accessed by the second live wire input end L2 is converted into direct current high voltage after rectification and is output to the main control module 2, the other part of live wire alternating current half-wave voltage is accessed to the second setting module 4 and triggers the second setting module 4 to start, the second setting module 4 after starting adjusts a current sampling value of the main control module 2, the main control module 2 detects the adjusted current sampling value and then adjusts current flowing through the LED load, and second dimming is carried out on the LED load.
When the rectifying module 1 uses the first live wire input end L1, the second live wire input end L2 and the zero line input end N to be connected with alternating current commercial power, the first setting module 3 and the second setting module 4 are started, the first setting module 3 and the second setting module 4 after the starting simultaneously adjust current sampling values of the main control module 2, and the main control module 2 adjusts current flowing through the LED load after detecting the adjusted current sampling values, so that third dimming is carried out on the LED load.
In some other embodiments, the first setting module 3 and the second setting module 4 are connected in parallel and then connected to the main control module 2.
As shown in fig. 3, in the present embodiment, the second setting module 4 includes a second setting unit and a second switching unit.
One end of the second setting unit is connected with the main control module 2, and the other end of the second setting unit is grounded or grounded through the first setting module; and the second switch unit is connected with the second setting unit in parallel and is connected with the second live wire input end L2, and is conducted and short-circuited when the second live wire input end L2 is connected with external alternating current.
The second setting unit is used for adjusting a current sampling signal of the main control module 2 by connecting the main control module 2, and the second switching unit is used for changing the access state of the second setting unit, so that the second setting unit is accessed to the main control module 2 or the second setting unit is short-circuited so that the second setting unit cannot be accessed to the main control module 2.
The second setting unit comprises a second current sampling resistor RS2, one end of the second current sampling resistor RS2 is connected with the current sampling end of the main control module 2 through the first connection, and the other end of the second current sampling resistor RS2 is grounded or grounded through the first current sampling resistor RS 1.
The second switch unit comprises a seventh diode D7, a sixteenth resistor R16, a seventeenth resistor R17, a second voltage stabilizing tube ZD2, an eighth capacitor C8 and a second MOS tube Q2; the anode of the seventh diode D7 is connected with the second live wire input end L2, the cathode of the seventh diode D7 is connected with the grid electrode of the second MOS tube Q2 through a sixteenth resistor R16, the drain electrode of the second MOS tube Q2 is connected with one end of the second current sampling resistor RS2 connected with the main control module 2, the source electrode of the second MOS tube Q2 is connected with one end of the second current sampling resistor RS1, the cathode of the second voltage stabilizing tube ZD2, one end of a seventeenth resistor R17 and one end of an eighth capacitor C8 are respectively connected with the grid electrode of the second MOS tube Q2, and the anode of the second voltage stabilizing tube ZD2, the other end of the seventeenth resistor R17, the other end of the eighth capacitor C8 and the source electrode of the second MOS tube Q2 are respectively grounded.
The seventh diode D7 is configured to rectify the ac mains input at the second live wire input end L2, the sixteenth resistor R16 is configured to divide the rectified high-voltage dc, the second MOS transistor Q2 is configured to short-circuit the second current sampling resistor RS2 when the second MOS transistor Q2 is turned on, so that the second current sampling resistor RS2 cannot be connected to the main control module 2, the seventeenth resistor R17 is configured to serve as a bias resistor of the second MOS transistor Q2, the second voltage regulator ZD2 is configured to provide voltage-stabilizing protection, and the eighth capacitor C8 plays a role in filtering.
When the control module works, when the second current sampling resistor RS2 is connected to the current sampling end of the main control module 2, the resistance value of the external resistor of the current sampling end of the main control module 2 is changed, so that the current sampling signal received by the main control module 2 is regulated, the main control module 2 regulates the current of the output load power supply, the second switch unit is connected to the alternating current mains supply introduced by the second live wire input end L2, the alternating current mains supply is converted into direct current suitable for driving the second MOS tube Q2 after passing through the seventh diode D7 and the sixteenth resistor R16, the second MOS tube Q2 is conducted, the second current sampling resistor RS2 is short-circuited, and the second current sampling resistor RS2 is not connected to the main control module 2. The first setting module 3 and the second setting module 4 are combined, thereby realizing three-stage dimming.
According to a second aspect of the present utility model, an LED lamp is provided, where the LED lamp includes the above LED dimming circuit, and the specific structure of the LED dimming circuit refers to the above embodiment, and since the LED lamp of the present utility model adopts all the technical solutions of all the embodiments, at least the LED lamp has all the beneficial effects brought by the technical solutions of the embodiments, which are not described in detail herein.
In summary, according to the LED dimming circuit and the LED lamp provided by the embodiments of the present utility model, by setting the first setting module and the plurality of groups of input ends, the ac mains supply is introduced by using the corresponding combination of input ends according to the dimming requirement, and on the basis of using the introduced ac mains supply and finally converting the ac mains supply into the load power source for driving the LED load, the ac mains supply flows into the first setting module to start the first setting module, and the current sampling value of the main control module is regulated by the first setting module after the first setting module is started, so that the main control module regulates the current flowing through the LED load according to the regulated current sampling value, thereby dimming the LED load without using a silicon controlled rectifier dimmer, reducing driving energy consumption, and improving compatibility to applicable scenes.
The embodiments described in the embodiments of the present utility model are for more clearly describing the technical solutions of the embodiments of the present utility model, and do not constitute a limitation on the technical solutions provided by the embodiments of the present utility model, and those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present utility model are equally applicable to similar technical problems.
It will be appreciated by persons skilled in the art that the embodiments of the utility model are not limited by the illustrations, and that more or fewer steps than those shown may be included, or certain steps may be combined, or different steps may be included.
The apparatus embodiments described above are merely illustrative, in that the circuitry illustrated as separate components may or may not be physically separate, i.e., may be located in one place, or may be distributed over multiple network circuits. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/circuits in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
The terms "first," "second," "third," "fourth," and the like in the description of the utility model and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or circuits is not necessarily limited to those steps or circuits that are expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present utility model, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided by the present utility model, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the above-described circuit division is merely a logical function division, and there may be other division manners in which a plurality of circuits 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 with each other may be an indirect coupling or communication connection via some interfaces, devices or circuits, which may be in electrical, mechanical or other form.
The circuits described above as separate components may or may not be physically separate, and components shown as circuits may or may not be physical circuits, i.e., may be located in one place, or may be distributed over multiple network circuits. Some or all of the circuits may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional circuit in each embodiment of the present utility model may be integrated in one processing circuit, or each circuit may exist alone physically, or two or more circuits may be integrated in one circuit. The integrated circuit may be implemented in hardware or in software functional circuits.
The preferred embodiments of the present utility model have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the embodiments of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present utility model shall fall within the scope of the claims of the embodiments of the present utility model.
Claims (10)
1. An LED dimmer circuit, comprising:
the rectification module is provided with a first live wire input end, a second live wire input end and a zero line input end, is connected with external alternating current, and converts the external alternating current into high-voltage direct current suitable for the LED dimming circuit to be output;
the main control module is connected with the rectifying module, is connected with the high-voltage direct current output by the rectifying module, and converts the high-voltage direct current into a load power supply suitable for the LED load to output;
the first setting module is connected with the first live wire input end and the main control module, and adjusts a current sampling value of the main control module when the external alternating current introduced by the first live wire input end is accessed, so that the main control module adjusts current flowing through the LED load according to the current sampling value.
2. The LED dimmer circuit of claim 1, wherein,
the rectification module comprises a first rectification unit, a second rectification unit and an input filtering unit;
the input end of the first rectifying unit is connected with the first live wire input end and the zero line input end, the output end of the first rectifying unit is connected with the input end of the input filtering unit, and the output end of the input filtering unit is connected with the main control module; the input end of the second rectifying unit is connected with the input end of the second live wire, and the output end of the second rectifying unit is connected with the input end of the input filtering unit.
3. The LED dimmer circuit of claim 1, wherein,
the first setting module comprises a first setting unit and a first switching unit;
one end of the first setting unit is connected with the main control module, and the other end of the first setting unit is grounded; the first switch unit is connected with the first setting unit in parallel and is connected with the first live wire input end, and the first setting unit is conducted and short-circuited when the first live wire input end is connected with external alternating current.
4. The LED dimmer circuit of claim 1, wherein,
the main control module comprises a power chip, a chip starting unit, a current setting unit and a driving unit;
the power chip is respectively connected with the chip starting unit, the current setting unit and the driving unit, the input end of the driving unit is the input end of the main control module, and the output end of the driving unit is the output end of the main control module.
5. The LED dimming circuit as recited in claim 4, wherein,
the power supply chip is a BOOST driving chip and is provided with a chip power supply pin, a driving pin and a current sampling pin;
the chip power supply pin is connected with the driving unit through the chip starting unit, and electricity is taken from the rectifying module through the driving unit; the driving pin is connected with the driving unit; the current sampling pin is connected with one end of the current setting unit, and the other end of the current setting unit is grounded through the first setting module.
6. The LED dimming circuit as recited in claim 5, wherein,
the main control module further comprises an overvoltage detection unit, a temperature monitoring unit and a conduction setting unit, wherein the power supply chip is further provided with an overvoltage protection pin, a temperature monitoring pin and a conduction setting pin;
the overvoltage protection pin is connected with the driving unit and the LED load through the overvoltage detection unit; the temperature monitoring pin is connected with the temperature monitoring unit; the conduction setting pin is connected with the conduction setting unit.
7. The LED dimmer circuit of claim 1, further comprising:
and the second setting module is connected with the second live wire input end and the main control module, and adjusts a current sampling value of the main control module when the external alternating current introduced by the second live wire input end is accessed.
8. The LED dimming circuit as recited in claim 7, wherein,
the first setting module and the second setting module are connected in series and then connected with the main control module; or the first setting module and the second setting module are connected in parallel and then connected with the main control module.
9. An LED dimming circuit as claimed in claim 7 or 8, wherein,
the second setting module comprises a second setting unit and a second switching unit;
one end of the second setting unit is connected with the main control module, and the other end of the second setting unit is grounded or grounded through the first setting module; the second switch unit is connected with the second setting unit in parallel and is connected with the second live wire input end, and is conducted and short-circuited when the second live wire input end is connected with external alternating current.
10. An LED lamp comprising the LED dimming circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223330378.7U CN219577308U (en) | 2022-12-12 | 2022-12-12 | LED dimming circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223330378.7U CN219577308U (en) | 2022-12-12 | 2022-12-12 | LED dimming circuit and LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN219577308U true CN219577308U (en) | 2023-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223330378.7U Active CN219577308U (en) | 2022-12-12 | 2022-12-12 | LED dimming circuit and LED lamp |
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| Country | Link |
|---|---|
| CN (1) | CN219577308U (en) |
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2022
- 2022-12-12 CN CN202223330378.7U patent/CN219577308U/en active Active
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