CN119050972A - Circuit capable of changing voltage division of input/output side grounding capacitance of isolated LED driving power supply - Google Patents
Circuit capable of changing voltage division of input/output side grounding capacitance of isolated LED driving power supply Download PDFInfo
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- CN119050972A CN119050972A CN202411144074.2A CN202411144074A CN119050972A CN 119050972 A CN119050972 A CN 119050972A CN 202411144074 A CN202411144074 A CN 202411144074A CN 119050972 A CN119050972 A CN 119050972A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
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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
- 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
本发明涉及LED驱动电源技术领域，提供了一种可改变隔离LED驱动电源输入输出侧对地电容分压的电路，包括一次侧电路，用以接入交流输入；其中，一次侧电路的电路输出端连接隔离变压器的输入端，一次侧电路的对地线之间设置电容分压电路；电容分压电路，用以设置分压比，该分压比用于改变一次侧电路输出电压；隔离变压器，用于对一次侧电路输出电压进行变压；其中，隔离变压器的输出端连接二次侧电路；二次侧电路，用以进行直流输出。通过本发明的电路，雷击浪涌防护电路可选用更低动作电压的放电管改善防雷效果，降低残压，更好的保护后级电路和负载。还可以通过加大输出对地线电容的容量来解决余晖问题，用较低的成本实现无余晖。
The present invention relates to the technical field of LED driver power supply, and provides a circuit capable of changing the capacitor voltage division between the input and output sides of an isolated LED driver power supply and the ground, including a primary side circuit for accessing an AC input; wherein the circuit output end of the primary side circuit is connected to the input end of an isolation transformer, and a capacitor voltage division circuit is arranged between the ground wire of the primary side circuit; the capacitor voltage division circuit is used to set a voltage division ratio, and the voltage division ratio is used to change the output voltage of the primary side circuit; the isolation transformer is used to transform the output voltage of the primary side circuit; wherein the output end of the isolation transformer is connected to a secondary side circuit; and the secondary side circuit is used to output a DC current. Through the circuit of the present invention, a lightning surge protection circuit can select a discharge tube with a lower operating voltage to improve the lightning protection effect, reduce the residual voltage, and better protect the subsequent circuit and load. The afterglow problem can also be solved by increasing the capacity of the output to ground capacitor, and no afterglow can be achieved at a lower cost.
Description
Technical Field
The invention relates to the field of LED driving power supplies, in particular to a circuit capable of changing the voltage division of capacitance to ground at an input/output side of an isolated LED driving power supply.
Background
At present, as the main power supply mode of most industrial equipment, communication equipment, household appliances, intelligent terminals and illumination lighting equipment at present, lightning surge protection is always an important technical index, and an effective lightning surge protection circuit can not only protect the power supply from being damaged by lightning, but also can protect terminal equipment supplied by the power supply to the greatest extent. At present, most lightning surge protection circuits adopt a mode that a piezoresistor is serially connected with a discharge tube to the ground to solve the common mode lightning surge problem, and lightning surge current is discharged to the ground through the piezoresistor and the discharge tube.
In a practical circuit, the input/output sides of the power supply are all provided with a capacitance to ground, and the requirement of the safety standard on the leakage current limits that the capacitance to ground of the input side must be smaller than a certain capacitance value, and if the capacitance value is exceeded, the leakage current does not meet the safety standard.
In addition, because parasitic capacitance or Y capacitance exists on the input/output side of the isolated LED driving power supply, the capacitance and the capacitance to the ground of the output side are divided, if the voltage to the ground of the output side is larger than the conducting voltage of the LED lamp beads, the AC current can flow through the LED lamp beads and the lamp panel to generate an afterglow phenomenon through the capacitance when the light is turned off, so that the capacitance to the ground of the output side is often far larger than the capacitance to the ground of the input side in order to avoid the afterglow phenomenon, the test voltage is almost added on the ground of the input side when the primary secondary voltage is tested, and in order to ensure that the discharge tube is not broken down when the voltage is tested, only the discharge tube with the action voltage close to the voltage test voltage or higher can be selected.
The higher the action voltage of the discharge tube is, the higher the action voltage of the lightning surge protection circuit is, the slower the response time is, the worse the lightning surge protection effect is, the higher the residual voltage is, and the lightning surge voltage lower than the action voltage of the discharge tube is not protected completely, so that the damage risk of products is greatly increased, and the existing circuit cannot simultaneously meet the requirements of no afterglow, voltage withstanding test and effective lightning surge protection.
Disclosure of Invention
The invention provides a circuit capable of changing the voltage division of a grounding capacitor at an input/output side of an isolated LED driving power supply, which is used for solving the problem that the existing circuit cannot meet the requirements of no afterglow, voltage withstand test and effective lightning surge protection.
The invention provides a circuit capable of changing the voltage division of a ground capacitor at an input and output side of an isolated LED driving power supply, which comprises:
the primary side circuit is used for accessing alternating current input, wherein the circuit output end of the primary side circuit is connected with the input end of the isolation transformer, and a capacitive voltage dividing circuit is arranged between the primary side circuit and the ground wire;
A capacitive voltage division circuit for setting a voltage division ratio for changing an output voltage of the primary side circuit;
the isolation transformer is used for transforming the output voltage of the primary side circuit, wherein the output end of the isolation transformer is connected with the secondary side circuit;
the secondary side circuit is used for outputting direct current.
In one embodiment of the invention, the capacitive voltage division circuit is a first voltage division circuit, a second voltage division circuit or a third voltage division circuit,
The first voltage dividing circuit is formed by connecting a first capacitor and a pressure sensitive circuit in series;
The second voltage dividing circuit is formed by connecting a second capacitor and a gas discharge tube in series;
the third voltage dividing circuit is composed of a third capacitor and a semiconductor element, wherein the semiconductor element has a blocking voltage characteristic.
The primary side circuit comprises a rectifier bridge, wherein a capacitive voltage dividing circuit is connected with the front end of the rectifier bridge or the rear end of the rectifier bridge;
when the capacitive voltage division circuit is connected with the front end of the rectifier bridge, the connection mode of the capacitive voltage division circuit comprises that the capacitive voltage division circuit is arranged between any position of a live wire in front of the rectifier bridge and the ground wire, or between any position of a zero wire in front of the rectifier bridge and the ground wire;
when the capacitive voltage division circuit is connected with the rear end of the rectifier bridge, the connection mode of the capacitive voltage division circuit comprises that the capacitive voltage division circuit is arranged between any position of a positive pole loop at the rear end of the rectifier bridge and the ground wire, or between any position of a negative pole loop at the rear end of the rectifier bridge and the ground wire;
The first voltage dividing circuit is also used for externally connecting a digital control circuit, wherein the digital control circuit comprises a microcontroller, a digital potentiometer, an analog circuit and a dimming controller;
the digital potentiometer is connected in series with the first voltage dividing circuit, the input end of the digital potentiometer is connected with the microcontroller, and the digital potentiometer is used for adjusting the voltage dividing ratio of the first voltage dividing circuit;
the input end of the microcontroller is connected with the analog circuit and the dimming controller, and the microcontroller is used for controlling the digital potentiometer to adjust the resistance value;
the output end of the analog controller is connected with the input end of the microcontroller, and the analog controller is used for receiving the photosensitive signal of the dimming controller;
the output of the dimming controller is linked to the input of the analog controller, which is used to measure the photosensitive signal of the LEC lamp.
As one embodiment of the invention, the microprocessor is internally provided with an analog operation array, wherein the analog operation array is used for:
Receiving a dimming signal of an analog circuit, inputting the dimming signal into an analog operation array, and performing a voltage ratio operation function, wherein the dimming signal determines a brightness difference value between real-time brightness and expected brightness of an LED lamp through the analog operation array;
According to the voltage ratio operation function, an adjusting value of the voltage division ratio of at least one first voltage division circuit is determined, and when the digital potentiometer adjusts the voltage division ratio of the first voltage division circuit to be in accordance with the adjusting value, the brightness difference value is normalized to 0.
The invention has the beneficial effects that:
According to the circuit, the lightning surge protection circuit can adopt the discharge tube with lower action voltage to improve the lightning protection effect, reduce residual voltage and better protect the subsequent-stage circuit and load. The problem of afterglow can be solved by increasing the capacity of the capacitance of the output to the ground wire, and the afterglow-free is realized with lower cost.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a circuit for isolating capacitive division of an input/output side of an LED driving power supply to ground in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of three different partial pressure modes according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first voltage divider circuit according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a second voltage divider circuit according to an embodiment of the invention;
Fig. 5 is a schematic diagram of a third voltage dividing circuit according to an embodiment of the invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
As shown in fig. 1, the present embodiment provides a circuit capable of changing the voltage division of the input/output side capacitance to ground of an isolated LED driving power supply, which includes:
the primary side circuit is used for accessing alternating current input, wherein the circuit output end of the primary side circuit is connected with the input end of the isolation transformer, and a capacitive voltage dividing circuit is arranged between the primary side circuit and the ground wire;
The capacitive voltage division circuit is used for setting a voltage division ratio, and the voltage division ratio is used for changing the voltage division ratio of the primary side circuit and the secondary side circuit during the voltage withstand test;
the isolation transformer is used for transforming the output voltage of the primary side circuit, wherein the output end of the isolation transformer is connected with the secondary side circuit;
And the secondary side circuit, the power supply output end and the LED lamp bead are connected for direct current output.
The principle of the technical scheme is as follows:
As shown in fig. 1, a variable voltage divider circuit is added to the ground at the input side, the operation voltage of the variable voltage divider circuit can be set according to the operation voltage of a discharge tube of the lightning surge protection circuit and the highest input voltage of a power supply, the operation voltage of the variable voltage divider circuit is set between the operation voltage of the variable voltage divider circuit and the highest input voltage of the power supply, and the voltage dividing ratio of the variable voltage divider circuit can be set according to the size of a ground capacitor at the input/output side, so that the capacitance of the ground capacitor at the output side can be increased to realize no afterglow, a discharge tube with lower operation voltage can be selected to ensure the protection effect of the lightning surge protection circuit, and the power supply and terminal equipment can be better protected. The variable voltage dividing circuit operates during the voltage withstand test, the voltage dividing ratio of the input/output side to the ground is changed, the voltage of the input side to the ground is reduced, the voltage is lower than the operating voltage of the discharge tube, and the voltage withstand test is ensured to pass. The variable voltage divider circuit does not act when the power supply works normally and does not influence the leakage current of the power supply, so that the variable voltage divider circuit can simultaneously meet the requirements of no afterglow, voltage withstanding test and effective lightning surge protection.
In a specific implementation, a voltage follower and measurement controller may be provided for the secondary side circuit. The measuring controller is arranged between the voltage follower and the capacitive voltage dividing circuit and used for outputting real-time voltage dividing ratio information. A voltage follower (also called a buffer amplifier) is a special operational amplifier circuit that has the characteristics of high input impedance and low output impedance. The main function of this is to keep the input voltage transferred to the output unchanged, i.e. the output voltage "follows" the input voltage variation. The non-inverting terminal of the voltage follower is connected to the output voltage of the primary side circuit. This means that the voltage follower will monitor the output voltage of the primary side circuit. The output end of the voltage follower is connected with the capacitive voltage dividing circuit. In this way, the output voltage of the primary side circuit is transferred to the capacitive voltage dividing circuit through the voltage follower, and the voltage of the primary side circuit is not affected by the load of the capacitive voltage dividing circuit. The measuring controller is used for monitoring the real-time voltage division ratio of the capacitive voltage division circuit and outputting related information. This allows the system to know the operating state of the capacitive divider circuit in real time and make the necessary adjustments. The measurement controller is disposed between the voltage follower and the capacitive divider circuit. It may comprise an a/D converter, microprocessor or other signal processing circuit for processing the output signal of the voltage follower.
In a specific implementation process, a voltage doubling circuit can be further arranged for the primary side circuit, the voltage doubling circuit is electrically connected with the capacitive voltage division circuit and used for outputting a voltage ratio signal by the capacitive voltage division circuit and controlling the output voltage of the primary side circuit based on the voltage ratio signal.
The voltage doubler circuit is an electronic circuit that functions to amplify an input voltage to twice or more. Such circuits are commonly used in applications requiring voltages above the input power supply voltage. The voltage doubler circuit is electrically connected to the capacitive divider circuit, meaning that the output of the voltage doubler circuit affects the operation of the capacitive divider circuit. The capacitive voltage divider circuit is used for providing a variable voltage division between the input and output sides and the ground, so as to monitor and control the voltage level of the circuit. The piezoelectric substrate controls the output voltage of the primary side circuit based on a voltage ratio signal output from the capacitive voltage dividing circuit. Specifically, the voltage doubler circuit may adjust its output according to the voltage ratio signal, thereby changing the output voltage of the primary side circuit. When the capacitive voltage divider circuit detects a change in the voltage ratio, it outputs a signal to the voltage doubling circuit, which receives the signal, and adjusts its output voltage by internal control logic (which may include comparators, transistors, relays, etc.). The output voltage of the primary side circuit can be indirectly controlled by changing the output of the voltage doubling circuit, so that the output voltage meets the design requirement.
The beneficial effects of the technical scheme are that:
According to the circuit, the lightning surge protection circuit can adopt the discharge tube with lower action voltage to improve the lightning protection effect, reduce residual voltage and better protect the subsequent-stage circuit and load. The problem of afterglow can be solved by increasing the capacity of the capacitance of the output to the ground wire, and the afterglow-free is realized with lower cost.
As an embodiment of the present invention, as shown in fig. 2, when the capacitive voltage dividing circuit is specifically configured, the capacitive voltage dividing circuit is of three types, namely, a first type voltage dividing circuit, a second type voltage dividing circuit or a third type voltage dividing circuit,
The first type of voltage dividing circuit is formed by connecting a first capacitor and a voltage sensitive circuit in series, as shown in fig. 3;
The second type of voltage dividing circuit is formed by connecting a second capacitor and a gas discharge tube in series, as shown in fig. 4;
the third type of voltage dividing circuit is constituted by a third capacitor and a semiconductor element having a blocking voltage characteristic, as shown in fig. 5.
The principle of the technical scheme is as follows:
In the implementation process of the invention, a variable voltage dividing circuit is added between an input side circuit and a ground wire, and the variable voltage dividing circuit is formed by serially connecting a capacitor with a piezoresistor or a gas discharge tube or a semiconductor device with voltage blocking characteristics (such as devices of a semiconductor discharge tube TSS, a bidirectional TVS and the like).
As shown in figure 1, the variable voltage divider circuit can be composed of a series capacitor of 1 piezoresistor, a series capacitor of 2 gas discharge tubes and a series capacitor of 3 semiconductor devices. The following describes the operation principle of the variable voltage dividing circuit by taking the series capacitance of the voltage dependent resistor in form 1 as an example (the operation principle of forms 2 and 3 is the same as that of form 1), when the voltage at two ends of the variable voltage dividing circuit is larger than the breakdown voltage of the voltage dependent resistor, the voltage dependent resistor is broken down and conducted, and the series capacitance is connected so that the capacitance capacity of the input side circuit to the ground wire is increased, and the divided voltage is reduced. When the voltage at two ends of the variable voltage dividing circuit is smaller than the breakdown voltage of the piezoresistor, the piezoresistor is not conducted, the series capacitor cannot be connected in, and the circuit is not affected. Therefore, the operating voltage of the variable voltage divider circuit can be set by the breakdown voltage of the varistor, and the voltage dividing ratio of the variable voltage divider circuit can be set by the capacity of the series capacitor.
The voltage limiting circuit comprises a first diode, a main control switch tube and a constant current control circuit, wherein the anode of the first diode is connected with the input end of the primary side, the cathode of the first diode is connected between the source electrode and the collector electrode of the main control switch tube, the output end of the constant current control circuit is connected with the anode of the first diode, and the input end of the constant current control circuit is connected with the grid electrode of the main control switch tube. The voltage limiting circuit has the effect that when the input voltage is in a normal range, the first diode is in a cut-off state (non-conduction), so that the work of the main control switch tube is not influenced. The constant current control circuit adjusts the grid voltage of the main control switching tube according to the requirement, so that the switching tube is controlled to be turned on and off, and the constant current of the LED is maintained. If the input voltage is too high, the first diode will turn on because it is a forward biased diode. When the first diode is turned on, it directs current between the source and collector of the main control switch, which results in a reduced gate voltage of the switch (since the output of the constant current control circuit is connected to the anode of the first diode and the input is connected to the gate of the switch). The gate voltage of the main control switching tube is reduced to cause the switching tube to be cut off, so that the current flowing to the LED is cut off, and the LED is protected from being damaged by the excessively high current. The output of the second voltage divider circuit may be used to adjust the reference voltage of the constant current control circuit so that the constant current of the LED may be maintained under different input voltage conditions. When the voltage abnormality is detected, the working point of the constant current control circuit can be adjusted by changing the voltage dividing ratio, so that the LED is further protected from damage.
The constant current control circuit of the voltage limiting circuit comprises an input node, an output node and a plurality of LED drivers connected in series, wherein the input node is used for being connected with the output end of a rectifier bridge of the primary side circuit, the output node is used for being connected with the input end of an isolation transformer, the LED drivers connected in series are connected between the input node and the output node, and the voltage difference between the input node and the output node is related to the number of the LED drivers. The output node of the constant current control circuit is connected with the input end of the isolation transformer. The isolation transformer is used to provide electrical isolation between the input side and the output side while the output voltage can be regulated as desired. The LED drivers are connected in series, between the input node and the output node. Each LED driver is responsible for controlling the current flowing through a particular LED or group of LEDs. When the rectifier bridge outputs pulsating direct current, the current flows to the input end of the isolation transformer through the LED drivers connected in series. Each LED driver is capable of regulating the current flowing through its corresponding LED to ensure that the current is maintained at a constant value, avoiding damage or performance degradation of the LED due to current fluctuations. Since the LED drivers are connected in series, the voltage difference between the input node and the output node is distributed according to the number of LED drivers. Each LED driver consumes a certain voltage according to its design parameters, so that the total voltage difference is distributed over all LED drivers. The constant current control circuit is used for maintaining constant current by monitoring the current and adjusting the conduction degree of the LED driver through a feedback mechanism. If the current exceeds the set value, the constant current control circuit reduces the conduction degree of the LED driver, thereby reducing the current, otherwise, if the current is lower than the set value, the conduction degree is increased.
The primary side circuit comprises a rectifier bridge, wherein a capacitive voltage dividing circuit is connected with the front end of the rectifier bridge or the rear end of the rectifier bridge;
when the capacitive voltage division circuit is connected with the front end of the rectifier bridge, the connection mode of the capacitive voltage division circuit comprises that the capacitive voltage division circuit is arranged between any position of a live wire in front of the rectifier bridge and the ground wire, or between any position of a zero wire in front of the rectifier bridge and the ground wire;
When the capacitive voltage division circuit is connected with the rear end of the rectifier bridge, the connection mode of the capacitive voltage division circuit comprises that the capacitive voltage division circuit is arranged between any position of a positive pole loop of the rear end of the rectifier bridge and the ground wire, or between any position of a negative pole loop of the rear end of the rectifier bridge and the ground wire.
The principle of the technical scheme is as follows:
The variable voltage divider circuit can be connected between any position of L line (fire wire) in front of the rectifier bridge and ground wire, between any position of N line (zero wire) in front of the rectifier bridge and ground wire, between any position of positive pole loop in back of the rectifier bridge and ground wire, and between any position of negative pole loop in back of the rectifier bridge and ground wire. The operating voltage of the variable voltage dividing circuit is set according to the operating voltage of the discharge tube of the lightning surge protection circuit and the highest input voltage of the power supply, the operating voltage of the variable voltage dividing circuit is set between the operating voltage of the lightning surge protection circuit and the highest input voltage of the power supply, the voltage dividing ratio of the variable voltage dividing circuit can be set according to the capacitance to ground of the input/output side, and the voltage divided by the ground wire of the input side is reduced, so that the discharge tube of the lightning surge protection circuit is prevented from being broken down during the voltage withstanding test, and the failure of the voltage withstanding test is avoided.
The first voltage dividing circuit is also used for externally connecting a digital control circuit, wherein the digital control circuit comprises a microcontroller, a digital potentiometer, an analog circuit and a dimming controller;
the digital potentiometer is connected in series with the first voltage dividing circuit, the input end of the digital potentiometer is connected with the microcontroller, and the digital potentiometer is used for adjusting the voltage dividing ratio of the first voltage dividing circuit;
the input end of the microcontroller is connected with the analog circuit and the dimming controller, and the microcontroller is used for controlling the digital potentiometer to adjust the resistance value;
the output end of the analog controller is connected with the input end of the microcontroller, and the analog controller is used for receiving the photosensitive signal of the dimming controller;
the output of the dimming controller is linked to the input of the analog controller, which is used to measure the photosensitive signal of the LEC lamp.
The principle of the technical scheme is as follows:
First, a circuit capable of changing the voltage division of the ground capacitance at the input and output sides of the isolated LED driving power supply is provided. The circuit divides the capacitance to the ground at the input and output sides, so that the proportional voltage division control of the primary and secondary voltages of the LED driving power supply is realized.
Second, the circuit can also be used to externally connect digital control circuits. The digital control circuit comprises a Microcontroller (MCU), a digital potentiometer DIP, an analog circuit (Amp and a light-adjusting controller LDR. These components can be connected together by means of a specific interface to form a complete digital control system, in the digital control system, the digital potentiometer DIP is connected in series on a first voltage dividing circuit, and its input end is directly connected to the MCU. The input end of the micro-controller MCU is connected with an analog circuit Amp and a light-adjusting controller LDR, which are responsible for controlling the resistance value of the digital potentiometer DIP, the design can lead the micro-controller to indirectly control the working state of the digital potentiometer through the control of the analog circuit, the output end of the analog circuit Amp is also directly connected to the input end of the microcontroller MCU, which is responsible for receiving and processing the light sensing signal from the dimming controller LDR.
In a specific implementation process, the analog controller comprises an analog-digital converter, and the analog-digital converter is electrically connected with the output end of the secondary side circuit and the input end of the primary side circuit, so that the real-time voltage division ratio can be set.
Finally, the output end of the dimming controller LDR is directly connected to the input end of the analog circuit Amp, which is responsible for measuring the photosensitive signal emitted by the LED. This signal is typically used to detect the actual operating state of the LED, such as temperature, current, etc.
As one embodiment of the invention, the microprocessor is internally provided with an analog operation array, wherein the analog operation array is used for:
Receiving a dimming signal of an analog circuit, inputting the dimming signal into an analog operation array, and performing a voltage ratio operation function, wherein the dimming signal determines a brightness difference value between real-time brightness and expected brightness of an LED lamp through the analog operation array;
According to the voltage ratio operation function, an adjusting value of the voltage division ratio of at least one first voltage division circuit is determined, and when the digital potentiometer adjusts the voltage division ratio of the first voltage division circuit to be in accordance with the adjusting value, the brightness difference value is normalized to 0.
The principle of the technical scheme is as follows:
The analog operation array mainly comprises a first aspect of receiving a dimming signal from an analog circuit and inputting the dimming signal into the analog operation array, and a second aspect of calculating an adjusting value of a voltage division ratio of at least one first voltage division circuit according to the input dimming signal and a result of the analog operation array. This adjustment value will be output for micro control (MCU adjusts the voltage division ratio of the first voltage division circuit as needed, in addition, in order to improve the accuracy and efficiency of the algorithm, the analog operation array further includes a series of algorithm and logic design, in particular, the analog operation array may utilize some preset parameters (e.g., gain, time constant, etc.) in the received dimming signal to compensate for the effects of ambient light, in addition, when the digital potentiometer adjusts the voltage division ratio of the first voltage division circuit to be matched with the adjustment value calculated by the analog operation array, the brightness difference value is classified as 0 because the two values are already balanced, so that the error can be eliminated, the stability of the whole system can be ensured, and the problems of system breakdown and the like caused by parameter mismatch are avoided.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411144074.2A CN119050972B (en) | 2024-08-20 | 2024-08-20 | Circuit that can change the capacitor voltage division between the input/output side of the isolated LED driver power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411144074.2A CN119050972B (en) | 2024-08-20 | 2024-08-20 | Circuit that can change the capacitor voltage division between the input/output side of the isolated LED driver power supply |
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| CN119050972A true CN119050972A (en) | 2024-11-29 |
| CN119050972B CN119050972B (en) | 2025-03-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060175986A1 (en) * | 2005-02-04 | 2006-08-10 | Samsung Electro-Mechanics Co., Ltd. | LED array driving apparatus and backlight driving apparatus using the same |
| CN202918561U (en) * | 2012-11-09 | 2013-05-01 | 厦门绿沃电子科技有限公司 | LED lamp power supply employing feedback voltage for light modulation |
| CN203590519U (en) * | 2013-07-08 | 2014-05-07 | 上海铸辉照明科技有限公司 | A soft start highly efficient energy saving LED driving power supply |
| CN109757009A (en) * | 2019-03-14 | 2019-05-14 | 深圳市健森实业有限公司 | A kind of high-precision LED light modulation line and input-output line isolation circuit control system |
-
2024
- 2024-08-20 CN CN202411144074.2A patent/CN119050972B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060175986A1 (en) * | 2005-02-04 | 2006-08-10 | Samsung Electro-Mechanics Co., Ltd. | LED array driving apparatus and backlight driving apparatus using the same |
| CN202918561U (en) * | 2012-11-09 | 2013-05-01 | 厦门绿沃电子科技有限公司 | LED lamp power supply employing feedback voltage for light modulation |
| CN203590519U (en) * | 2013-07-08 | 2014-05-07 | 上海铸辉照明科技有限公司 | A soft start highly efficient energy saving LED driving power supply |
| CN109757009A (en) * | 2019-03-14 | 2019-05-14 | 深圳市健森实业有限公司 | A kind of high-precision LED light modulation line and input-output line isolation circuit control system |
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| CN119050972B (en) | 2025-03-14 |
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