A wide voltage input single lamp controller

Abstract

The utility model discloses a wide voltage input single lamp controller, its through input rectifier filter circuit carries out rectification and filter processing to the obtained commercial power to get the stable voltage, and power control circuit and input rectifier filter circuit electric connection, and carry out periodic conduction and shutdown, transformer T2 and power control circuit electric connection, and according to transformer T2's primary winding and secondary winding number of turns, voltage transformation, to get output voltage, feedback control circuit electric connection between power control circuit and transformer T2, and be used for through real -time monitoring and feedback to voltage, adjust the on time and shutdown time of power control circuit, output rectifier filter circuit and transformer T2 electric connection, and filter out the ripple in output voltage, and output stable DC power supply, realize adaptation wide voltage input, ensure that output voltage is highly stable and dynamic self -adaptation ability, can real -time monitoring and adjust, guarantee single lamp's compatibility.

Description

Technical Field

[0001] This utility model relates to the field of intelligent lighting technology, and in particular to a wide voltage input single-lamp controller. Background Technology

[0002] In municipal street lighting systems, traditional street light controllers mostly use power frequency transformers as input power conversion devices, with a narrow input voltage range, commonly AC176-264V. Some systems use switching power supply modules as power conversion devices, with a significantly wider input voltage range than transformers, commonly 100-240VAC; AC90-305V to adapt to global grid voltage fluctuations. However, this design still has significant limitations when facing complex and ever-changing power supply environments. Municipal street light power distribution systems frequently encounter various faults during operation, with grounding faults being particularly common. Once a grounding fault occurs, the supply voltage may fluctuate significantly or even rise. In actual municipal street light maintenance, when a grounding fault occurs, the line voltage can reach as high as approximately 380V, exceeding the tolerance range of traditional street light controllers, leading to controller damage and affecting normal street lighting, causing considerable inconvenience to urban nighttime traffic safety and residents' lives. Utility Model Content

[0003] The purpose of this invention is to address the technical problems existing in the background technology by proposing a wide voltage input single-lamp controller.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] A wide-voltage input single-lamp controller includes an input rectifier and filter circuit, a power control circuit, a transformer T2, a feedback control circuit, and an output rectifier and filter circuit. The input rectifier and filter circuit rectifies and filters the acquired mains power to obtain a stable voltage. The power control circuit is electrically connected to the input rectifier and filter circuit and is used to perform periodic on and off cycles. The transformer T2 is electrically connected to the power control circuit and is used to transform the voltage according to the number of turns in the primary and secondary windings of the transformer T2 to obtain the output voltage. The feedback control circuit is electrically connected between the power control circuit and the transformer T2 and is used to adjust the on and off times of the power control circuit through real-time monitoring and feedback of the voltage. The output rectifier and filter circuit is electrically connected to the transformer T2 and is used to filter out ripple in the output voltage and output a stable DC power supply.

[0006] Preferably, the input rectifier filter circuit includes a rectifier bridge T4, capacitors CX1, C3, and C9, and an inductor T3. Pins 1 and 2 of the rectifier bridge T4 are electrically connected to pins 4 and 1 of the inductor T3, respectively. Capacitors C3 and C9 are connected in series and electrically connected to pins 3 and 4 of the rectifier bridge T4, respectively. The two ends of capacitor CX1 are electrically connected to pins 2 and 3 of the inductor T3, respectively.

[0007] Preferably, the power control circuit includes a power switching transistor.

[0008] Preferably, the feedback control circuit includes a rectifier and a voltage reference circuit, as well as a voltage divider resistor network. The rectifier and voltage reference circuit are electrically connected to pins 4 and 5 of the transformer T2, respectively, and are used to convert the AC voltage induced by the transformer T2 into a pulsating DC voltage and filter the pulsating DC voltage to obtain a DC voltage as a reference. The voltage divider resistor network is electrically connected to pin 4 of the transformer T2 and the feedback pin of the power switch to convert the high voltage signal of the transformer T2 into a low voltage signal and send it to the power switch.

[0009] Preferably, pin 5 of transformer T2 is grounded to PGND. The rectification and voltage reference circuit includes diode D5, resistor R35, capacitor C13, and capacitor C10. Resistor R35 and capacitor C13 are connected in series. The anode of diode D5 is electrically connected to pin 4 of transformer T2. The cathode of diode D5 is electrically connected to resistor C35. Capacitor C13 is grounded to PGND. Capacitor C10 is connected in parallel with capacitor C13. Capacitor C10 is electrically connected to the PVDD terminal of the power switch.

[0010] Preferably, the voltage divider resistor network includes resistors R36, R39, and R40. Resistors R36 and R40 are connected in series. Resistor R36 is electrically connected to pin 4 of transformer T2. Resistor R40 is grounded to PGND. Resistors R39 and R40 are connected in parallel and electrically connected to the feedback pin of transformer T2.

[0011] Preferably, the output rectifier filter circuit includes a rectifier diode D3, a filter capacitor C4, a filter capacitor C5, and an inductor L1. The anode of the rectifier diode D3 is electrically connected to pin 6 of the transformer T2. The first end of the inductor L1 is electrically connected to the cathode of the rectifier diode D3, and the second end of the inductor L1 is connected to a preset 12V power supply. The filter capacitors C4 and C5 are connected in parallel across the two ends of the inductor L1, and the ends of the filter capacitors C4 and C5 furthest from the inductor L1 are electrically connected to pin 7 of the transformer T2.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects: The input rectifier and filter circuit rectifies and filters the mains power to obtain a stable voltage. The power control circuit is electrically connected to the input rectifier and filter circuit and performs periodic on / off switching. The transformer T2 is electrically connected to the power control circuit and transforms the voltage according to the number of turns in the primary and secondary windings of the transformer T2 to obtain the output voltage. The feedback control circuit is electrically connected between the power control circuit and the transformer T2 and is used to adjust the on / off time of the power control circuit through real-time monitoring and feedback of the voltage. The output rectifier and filter circuit is electrically connected to the transformer T2 and filters out ripple in the output voltage, outputting a stable DC power supply. This achieves wide voltage input compatibility, ensures high output voltage stability and dynamic adaptive capability, enables real-time monitoring and adjustment, and guarantees compatibility with individual lamps. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure provided in the embodiments of this utility model. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure provided in the embodiments of this utility model. Figure 2 .

[0015] Icon labels:

[0016] 100 Input rectifier and filter circuit, 200 Power supply control circuit, 300 Feedback control circuit, 301 Rectifier and voltage reference circuit, 302 Voltage divider resistor network, 400 Output rectifier and filter circuit. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or assembly referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a link, or a specific connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two groups. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 as well as Figure 2 As shown, this utility model proposes a wide voltage input single-lamp controller, which includes an input rectifier and filter circuit 100, a power control circuit 200, a transformer T2, a feedback control circuit 300, and an output rectifier and filter circuit 400. The input rectifier and filter circuit 100 is used to rectify and filter the acquired mains power to obtain a stable voltage. The power control circuit 200 is electrically connected to the input rectifier and filter circuit 100 and is used to perform periodic on and off cycles. The transformer T2 is electrically connected to the power control circuit 200 and is used to transform the voltage according to the number of turns of the primary and secondary windings of the transformer T2 to obtain the output voltage. The feedback control circuit 300 is electrically connected between the power control circuit 200 and the transformer T2 and is used to adjust the on and off times of the power control circuit 200 through real-time monitoring and feedback of the voltage. The output rectifier and filter circuit 400 is electrically connected to the transformer T2 and is used to filter out ripple in the output voltage and output a stable DC power supply.

[0022] It should be noted that the specific implementation method of this embodiment is as follows:

[0023] This wide-voltage input single-lamp controller receives AC power from the mains and converts the AC power into pulsating DC power through the input rectifier and filter circuit 100. The pulsating component is then filtered out, resulting in a smooth DC voltage output. The power control circuit 200 receives the DC voltage output from the input rectifier and filter circuit 100, and the internal switching transistor begins to operate, performing periodic on / off cycles. When on, the input DC voltage is applied to the primary winding of transformer T2, and electrical energy is stored in the transformer in the form of a magnetic field. When off, the magnetic field energy of the primary winding is transferred to the secondary winding through electromagnetic induction, achieving voltage transformation.

[0024] The feedback control circuit 300 monitors the changes in the secondary output voltage in real time through the feedback winding of the transformer T2, rectifies and filters the monitored voltage signal to obtain a stable feedback voltage, and converts the feedback voltage into a signal suitable for detection by the power control circuit 200 through a voltage divider resistor network. The power control circuit 200 compares the sampling signal sent by the feedback control circuit 300 with the internal reference voltage to determine whether the output voltage deviates from the target value.

[0025] If the output voltage is too high, the controller shortens the conduction time, reduces the energy transferred by the transformer, and lowers the output voltage; if the output voltage is too low, the controller extends the conduction time, increases the energy transferred by the transformer, and raises the output voltage.

[0026] The AC voltage output from the secondary winding of transformer T2 is rectified and converted into pulsating DC power. The output rectifier filter circuit 40 filters out the pulsating component, outputting a smooth and stable DC power supply (such as a DC voltage suitable for a single lamp). The feedback control circuit 300 continuously monitors the output voltage, and the power control circuit 200 adjusts the switching action of the switching transistor in real time to ensure that the output voltage remains stable under wide voltage input or load changes. The output rectifier filter circuit 400 supplies stable DC power to the single lamp, ensuring its normal operation.

[0027] It's worth noting that transformer T2 is a key component of the flyback switching power supply. It not only provides electrical isolation between the input and output but also performs voltage transformation and energy transfer. The turns ratio of the transformer's primary and secondary windings determines the output voltage. In this design, the transformer's turns ratio was precisely calculated based on the required output and input voltage ranges to ensure a stable DC voltage output across an input voltage range of AC 80-420V. The transformer's core material is a high-permeability, low-loss ferrite material to improve efficiency and performance. In practical applications, transformer leakage inductance can affect circuit performance; therefore, the design incorporates measures such as optimizing the winding structure and adding shielding layers to minimize leakage inductance and improve power supply stability and reliability.

[0028] In one embodiment of this application, the input rectifier filter circuit 100 includes a rectifier bridge T4, capacitors CX1, C3, and C9, and an inductor T3. Pins 1 and 2 of the rectifier bridge T4 are electrically connected to pins 4 and 1 of the inductor T3, respectively. Capacitors C3 and C9 are connected in series and electrically connected to pins 3 and 4 of the rectifier bridge T4, respectively. The two ends of capacitor CX1 are electrically connected to pins 2 and 3 of the inductor T3, respectively.

[0029] It should be noted that when the input voltage fluctuates within the range of AC 80-420V, the rectifier bridge T4 can convert AC to DC, while the filter circuit composed of capacitors and inductor T3 can effectively filter out high-frequency noise and ripple in the input voltage, making the voltage input to the power switch more stable. When the input voltage is low, the capacitors can store a certain amount of energy to compensate for the insufficient voltage; when the input voltage is high, inductor T3 can suppress sudden current changes and protect circuit components from excessive current surges. The two 400V electrolytic capacitors C3 and C9, with the same capacitance value, are connected in series at the DC output terminal of the rectifier bridge T4. The maximum DC output voltage of this rectifier bridge can reach 800V.

[0030] In one embodiment of this application, the power control circuit 200 includes a power switching transistor.

[0031] It should be noted that the power switch (usually integrated within the control chip in low-power power supplies) W1, as one of the core components of the main circuit, undertakes the crucial task of controlling energy transmission. Under the influence of the control signal, it periodically turns on and off, controlling the current in the primary winding of the transformer. When the power switch W1 is on, the input voltage is applied to the primary winding (1-3) of transformer T2, the current gradually increases, and energy is stored in the transformer. When the power switch W1 is off, the current in the primary winding of the transformer decreases rapidly, and the stored energy is coupled to the secondary winding (6-7 of transformer T2) through the transformer, providing power to the load. When selecting the power switch (usually integrated within the control chip in low-power power supplies), its withstand voltage, on-resistance, and switching speed were carefully considered to ensure reliable operation over a wide voltage input range. In this embodiment, a MOSFET power switch with a withstand voltage as high as 750V (integrated within the power switch) was selected. Its on-resistance is as low as a few milliohms, its switching speed is fast, and it can quickly respond to control signals, effectively reducing power loss and switching noise.

[0032] In one embodiment of this application, the feedback control circuit 300 includes a rectifier and voltage reference circuit 301 and a voltage divider resistor network 302. The rectifier and voltage reference circuit 301 is electrically connected to pins 4 and 5 of the transformer T2, respectively, and is used to convert the AC voltage induced by the transformer T2 into a pulsating DC voltage and filter the pulsating DC voltage to obtain a DC voltage as a reference. The voltage divider resistor network 302 is electrically connected to pin 4 of the transformer T2 and the feedback pin of the power switch to convert the high voltage signal of the transformer T2 into a low voltage signal and send it to the power switch.

[0033] In one embodiment of this application, pin 5 of transformer T2 is grounded to PGND. The rectifier and voltage reference circuit 301 includes diode D5, resistor R35, capacitor C13, and capacitor C10. Resistor R35 and capacitor C13 are connected in series. The anode of diode D5 is electrically connected to pin 4 of transformer T2. The cathode of diode D5 is electrically connected to resistor C35. Capacitor C13 is grounded to PGND. Capacitor C10 is connected in parallel with capacitor C13. Capacitor C10 is electrically connected to the PVDD terminal of the power switch.

[0034] In one embodiment of this application, the voltage divider resistor network 302 includes resistors R36, R39, and R40. Resistors R36 and R40 are connected in series. Resistor R36 is electrically connected to pin 4 of transformer T2. Resistor R40 is grounded to PGND. Resistors R39 and R40 are connected in parallel and are electrically connected to the feedback pin of transformer T2.

[0035] It should be noted that by monitoring and receiving feedback on the output voltage in real time, the on-time and off-time of the power switch are adjusted, thereby achieving precise control of the output voltage. The voltage feedback circuit samples and compares the output voltage. When the output voltage changes, the power switch adjusts the output control signal according to a preset control algorithm, changing the on-time of the power switch to keep the output voltage stable. In designing the feedback control circuit, its response speed and stability were fully considered, enabling the feedback control circuit to respond quickly and accurately to changes in the output voltage, ensuring stable operation of the main circuit under wide voltage input and different load conditions.

[0036] In one embodiment of this application, the output rectifier filter circuit 400 includes a rectifier diode D3, a filter capacitor C4, a filter capacitor C5, and an inductor L1. The anode of the rectifier diode D3 is electrically connected to pin 6 of the transformer T2. The first end of the inductor L1 is electrically connected to the cathode of the rectifier diode D3, and the second end of the inductor L1 is connected to a preset 12V power supply. The filter capacitors C4 and C5 are connected in parallel across the two ends of the inductor L1, and the ends of the filter capacitors C4 and C5 furthest from the inductor L1 are electrically connected to pin 7 of the transformer T2.

[0037] It should be noted that a fast recovery diode was selected for the rectifier diode D3, which has a short reverse recovery time and can quickly respond to changes in current, reducing reverse recovery losses. The LC filter circuit composed of filter capacitors C4 and C5 and inductor L1 can effectively filter out high-frequency ripple and low-frequency noise in the output voltage, making the output voltage smoother and more stable. In practical applications, the parameters of the filter capacitors and inductors were reasonably selected according to the load size and voltage stability requirements to ensure that the ripple coefficient of the output voltage is controlled within a low range, meeting the operating requirements of the single-lamp controller.

[0038] It should be noted that the above descriptions are one or more embodiments provided in conjunction with specific content, and do not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A wide voltage input single-lamp controller, characterized in that, include: The input rectifier and filter circuit is used to rectify and filter the acquired mains power to obtain a stable voltage. A power control circuit is electrically connected to the input rectifier and filter circuit and is used to perform periodic on and off switching. Transformer T2 is electrically connected to the power control circuit and is used to transform the voltage according to the number of turns of the primary and secondary windings of transformer T2 to obtain the output voltage. A feedback control circuit is electrically connected between the power control circuit and the transformer T2, and is used to adjust the on-time and off-time of the power control circuit by real-time monitoring and feedback of the voltage. The output rectifier and filter circuit is electrically connected to the transformer T2 and is used to filter out the ripple in the output voltage and output a stable DC power supply.

2. A wide voltage input single-lamp controller according to claim 1, characterized in that, The input rectifier and filter circuit includes a rectifier bridge T4, capacitors CX1, C3, and C9, and an inductor T3. Pins 1 and 2 of the rectifier bridge T4 are electrically connected to pins 4 and 1 of the inductor T3, respectively. Capacitors C3 and C9 are connected in series and electrically connected to pins 3 and 4 of the rectifier bridge T4, respectively. The two ends of capacitor CX1 are electrically connected to pins 2 and 3 of the inductor T3, respectively.

3. A wide voltage input single-lamp controller according to claim 2, characterized in that, The power control circuit includes a power switching transistor.

4. A wide voltage input single-lamp controller according to claim 3, characterized in that, The feedback control circuit includes a rectifier and a voltage reference circuit, as well as a voltage divider resistor network. The rectifier and voltage reference circuit are electrically connected to pins 4 and 5 of the transformer T2, respectively, and are used to convert the AC voltage induced by the transformer T2 into a pulsating DC voltage, and to filter the pulsating DC voltage to obtain a DC voltage as a reference. The voltage divider resistor network is electrically connected to pin 4 of the transformer T2 and the feedback pin of the power switch, and is used to convert the high voltage signal of the transformer T2 into a low voltage signal and send it to the power switch.

5. A wide voltage input single-lamp controller according to claim 4, characterized in that, The transformer T2 has its pin 5 grounded to PGND. The rectification and voltage reference circuit includes a diode D5, a resistor R35, a capacitor C13, and a capacitor C10. The resistor R35 is connected in series with the capacitor C13. The anode of the diode D5 is electrically connected to pin 4 of the transformer T2. The cathode of the diode D5 is electrically connected to the resistor C35. The capacitor C13 is grounded to PGND. The capacitor C10 is connected in parallel with the capacitor C13. The capacitor C10 is electrically connected to the PVDD terminal of the power switch.

6. A wide voltage input single-lamp controller according to claim 5, characterized in that, The voltage divider resistor network includes resistors R36, R39, and R40. Resistors R36 and R40 are connected in series. Resistor R36 is electrically connected to pin 4 of transformer T2. Resistor R40 is grounded to PGND. Resistor R39 and R40 are connected in parallel and electrically connected to the feedback pin of transformer T2.

7. A wide voltage input single-lamp controller according to claim 6, characterized in that, The output rectifier and filter circuit includes a rectifier diode D3, a filter capacitor C4, a filter capacitor C5, and an inductor L1. The anode of the rectifier diode D3 is electrically connected to pin 6 of the transformer T2. The first end of the inductor L1 is electrically connected to the cathode of the rectifier diode D3, and the second end of the inductor L1 is connected to a preset 12V power supply. The filter capacitors C4 and C5 are connected in parallel across the two ends of the inductor L1, and the ends of the filter capacitors C4 and C5 furthest from the inductor L1 are electrically connected to pin 7 of the transformer T2.

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