Special tungsten lamp power supply circuit and electronic device
Patent Information
- Application Number
- CN202522313985.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-10-31
AI Technical Summary
[0004]然而，现有技术在实际应用中存在显著缺陷：为确保钨灯能够正常启动并达到额定功率，电源模块需要提供足够的输出功率，但当直接加大输出功率时，由于钨灯灯丝在冷态下电阻较小，会导致瞬间电流过大，极易造成灯丝过热烧毁；同时，部分方案为避免烧毁问题，会额外增加复杂的功率限制或保护电路，这不仅增加了电路设计的复杂度，还导致元器件成本和生产工艺成本的显著上升，难以兼顾供电可靠性与经济性
[0016]本申请的有益效果是：电路包含电源模块、多个RC积分模块以及光耦，每个RC积分模块由积分单元、开关单元和稳压单元构成，且各积分单元的时间常数与稳压单元的稳压值均互不相同。当电源模块开始供电后，输入信号会同时进入所有RC积分模块的积分单元，但由于时间常数的差异，各积分单元的输出电压上升速度不同。时间常数最小的积分单元率先达到阈值，使对应开关单元导通，此时其稳压单元被激活并将特定稳压值反馈至光耦，光耦再将信号传递给电源模块的初级PWM控制端，促使电源输出初始电压。随着时间推移，时间常数依次增大的积分单元陆续触发对应开关单元与稳压单元，向光耦提供递增的稳压值，光耦持续调整反馈信号，使电源模块的输出电压逐步提升，最终平稳过渡至额定电压。
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Figure CN224909706U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of power supply circuits, and more particularly to a special tungsten lamp power supply circuit and electronic equipment. Background Technology
[0002] In special tungsten lamp applications, stable operation places strict requirements on the power output accuracy and dynamic control capabilities of the power supply. This is especially true in the field of new energy electronics, where the reliability of the power module directly affects the lifespan and working efficiency of the tungsten lamp.
[0003] Currently, most specialized tungsten lamp power supply modules on the market employ a primary PWM controller to directly adjust the output voltage or power to meet the lamp's operating requirements. These solutions typically rely on a fixed feedback mechanism for voltage output, lacking refined dynamic management of the power output process.
[0004] However, existing technologies have significant drawbacks in practical applications: to ensure that tungsten lamps can start normally and reach their rated power, the power supply module needs to provide sufficient output power. However, when the output power is directly increased, the tungsten lamp filament has low resistance in a cold state, which can lead to excessive instantaneous current and easily cause the filament to overheat and burn out. At the same time, some solutions add complex power limiting or protection circuits to avoid burnout, which not only increases the complexity of circuit design but also leads to a significant increase in component and manufacturing costs, making it difficult to balance power supply reliability and economy. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, this application provides a special tungsten lamp power supply circuit and electronic equipment, which solves the technical problems mentioned in the background art and effectively balances power supply safety and economy.
[0006] The technical solution adopted by this application to solve its technical problem is: In a first aspect, this application provides a special tungsten lamp power supply circuit, including: a power module, multiple RC integration modules and an optocoupler; each of the RC integration modules includes an integration unit, a switching unit and a voltage regulation unit; the time constants of all integration units and the voltage regulation values of all voltage regulation units are different from each other; The first output terminal of the power module is connected to the first input terminal of the integration unit in each of the RC integration modules, the first output terminals of all the integration units are grounded, and the second output terminals of all the integration units are connected to the first input terminal of the switching unit in the corresponding RC integration module. The output terminals of all switching units are grounded, and the second input terminals of all switching units are connected to the output terminals of the voltage regulation units in the corresponding RC integration modules. The input terminals of all voltage regulator units are connected to the output terminals of the optocoupler, and the input terminals of the optocoupler are connected to the second output terminal of the power module. After the power module starts supplying power, it sequentially turns on each RC integral module according to the time constant of each RC integral module, thereby providing the optocoupler with multiple increasing regulated voltage values to achieve power supply transition.
[0007] Optional features include: three RC integration modules; The first RC integration module includes a first integration unit, a first switching unit, and a first voltage regulation unit; The second RC integration module includes a second integration unit, a second switching unit, and a second voltage regulation unit; The third RC integrator module includes a third integrator unit, a third switching unit, and a third voltage regulator unit.
[0008] Optionally, the first integration unit includes a first resistor and a first capacitor; the first switching unit includes a first transistor; and the first voltage regulation unit includes a first Zener diode. The first output terminal of the power module is connected to one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor and one end of the first capacitor, and the other end of the first capacitor is grounded. The emitter of the first transistor is grounded, the collector of the first transistor is connected to the positive terminal of the first Zener diode, and the negative terminal of the first Zener diode is connected to the output terminal of the optocoupler.
[0009] Optionally, the breakdown voltage of the first Zener diode is 4.7V; the capacitance of the first capacitor is 47μF.
[0010] Optionally, the second integration unit includes a second resistor and a second capacitor; the second switching unit includes a second transistor; and the second voltage regulation unit includes a second Zener diode. The first output terminal of the power module is connected to one end of the second resistor, the other end of the second resistor is connected to the base of the second transistor and one end of the second capacitor, and the other end of the second capacitor is grounded. The emitter of the second transistor is grounded, the collector of the second transistor is connected to the positive terminal of the second Zener diode, and the negative terminal of the second Zener diode is connected to the output terminal of the optocoupler.
[0011] Optionally, the breakdown voltage of the second Zener diode is 6.2V; the capacitance of the second capacitor is 22μF.
[0012] Optionally, the third integration unit includes a third resistor and a third capacitor; the third switching unit includes a third transistor; and the third voltage regulation unit includes a third Zener diode. The first output terminal of the power module is connected to one end of the third resistor, the other end of the third resistor is connected to the base of the third transistor and one end of the third capacitor, and the other end of the third capacitor is grounded. The emitter of the third transistor is grounded, the collector of the third transistor is connected to the positive terminal of the third Zener diode, and the negative terminal of the third Zener diode is connected to the output terminal of the optocoupler.
[0013] Optionally, the breakdown voltage of the third Zener diode is 8.2V; the capacitance of the third capacitor is 10μF.
[0014] Optionally, the resistors in the first integration unit, the second integration unit, and the third integration unit are all 100K.
[0015] Secondly, this application provides an electronic device equipped with the aforementioned special tungsten lamp power supply circuit.
[0016] The beneficial effects of this application are as follows: The circuit includes a power supply module, multiple RC integrator modules, and an optocoupler. Each RC integrator module consists of an integrator unit, a switching unit, and a voltage regulator unit, and the time constant of each integrator unit and the voltage regulation value of the voltage regulator unit are different from each other. When the power supply module starts supplying power, the input signal enters the integrator units of all RC integrator modules simultaneously. However, due to the difference in time constants, the output voltage rise rate of each integrator unit is different. The integrator unit with the smallest time constant reaches the threshold first, causing the corresponding switching unit to conduct. At this time, its voltage regulator unit is activated and feeds back a specific voltage regulation value to the optocoupler. The optocoupler then transmits the signal to the primary PWM control terminal of the power supply module, causing the power supply to output an initial voltage. As time goes by, the integrator units with progressively increasing time constants successively trigger the corresponding switching units and voltage regulator units, providing an increasing voltage regulation value to the optocoupler. The optocoupler continuously adjusts the feedback signal, causing the output voltage of the power supply module to gradually increase and finally smoothly transition to the rated voltage.
[0017] This segmented voltage output mechanism avoids instantaneous high-power surges. The low initial voltage ensures that the cold filament will not burn out due to excessive current, while the gradually increasing voltage thereafter meets the power requirements for normal operation of the tungsten lamp, achieving safe startup without relying on complex power limiting circuits. Simultaneously, the circuit achieves dynamic feedback control through a combination of an RC integrator module and an optocoupler, eliminating the need for additional protection components found in traditional solutions. This simplifies the circuit structure, reduces costs, and effectively balances power supply safety and economy. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the module connection of the special tungsten lamp power supply circuit provided in the embodiments of this application; Figure 2This is a schematic diagram of the circuit principle of the special tungsten lamp power supply circuit provided in the embodiments of this application. Detailed Implementation
[0019] The present application will be further described below with reference to the accompanying drawings and embodiments.
[0020] The following will clearly and completely describe the concept, specific structure, and resulting technical effects of this application in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this application. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this application can be combined interactively without contradicting each other.
[0021] Reference Figure 1 , Figure 1 This is a schematic diagram of the module connection of the special tungsten lamp power supply circuit provided in the embodiments of this application. It shows the design of several key modules of the power supply circuit provided in the embodiments of this application, including: a power supply module, multiple RC integration modules and an optocoupler; each of the RC integration modules includes an integration unit, a switching unit and a voltage regulation unit; the time constants of all integration units and the voltage regulation values of all voltage regulation units are different from each other.
[0022] The power supply module converts input electrical energy into the voltage required for the tungsten lamp, serving as the signal source. The RC integrator module is the key unit for implementing segmented voltage control, consisting of an integrator (composed of resistors and capacitors, generating time delay through charging and discharging), a switching unit (such as a transistor, used to control circuit switching), and a voltage regulator unit (such as a Zener diode, maintaining a specific voltage value). The optocoupler is an optocoupler that achieves electrical isolation between the input and output circuits through photoelectric conversion, ensuring stable transmission of the feedback signal. The time constant is a parameter of the charging and discharging speed of the RC integrator unit (determined by the product of the resistance and capacitance values), and the regulated voltage value is the voltage reference maintained after the voltage regulator unit breaks down and conducts; both are set to different values in different RC integrator modules.
[0023] Furthermore, combined Figure 1 A detailed explanation of each key module is provided below: The first output terminal of the power module is connected to the first input terminal of the integration unit in each of the RC integration modules, the first output terminals of all the integration units are grounded, and the second output terminals of all the integration units are connected to the first input terminal of the switching unit in the corresponding RC integration module. The output terminals of all switching units are grounded, and the second input terminals of all switching units are connected to the output terminals of the voltage regulation units in the corresponding RC integration modules. The input terminals of all voltage regulator units are connected to the output terminals of the optocoupler, and the input terminals of the optocoupler are connected to the second output terminal of the power module. After the power module starts supplying power, it sequentially turns on each RC integral module according to the time constant of each RC integral module, thereby providing the optocoupler with multiple increasing regulated voltage values to achieve power supply transition.
[0024] The power module's first output is a channel providing a start signal to the RC integrator module, while its second output is used to connect to the optocoupler input to form a feedback control loop. The integrator unit's first input is an interface for receiving signals from the power module, and its first output is grounded to form a loop reference point for the integrator unit's charging and discharging. Its second output transmits the integrated voltage signal to the switching unit. The switching unit's first input receives the integrator unit's trigger signal, its second input is connected to the voltage regulator unit to obtain a voltage reference, and its output is grounded to ensure a complete loop is formed when the switch is on. The voltage regulator unit's input receives the optocoupler output signal, and its output provides a stable voltage signal to the switching unit.
[0025] Specifically, when the power module starts up, its first output terminal simultaneously inputs signals to the integration units of all RC integration modules, and the integration units begin charging and discharging. Since the time constants of each integration unit are different, the integration unit with the smallest time constant outputs a trigger voltage to the first input terminal of the corresponding switching unit through its second output terminal, turning on the switching unit. At this time, the second input terminal of the switching unit obtains a voltage signal through a voltage regulator unit, and the input terminal of the voltage regulator unit is connected to the output terminal of the optocoupler. The optocoupler then receives the initial signal from the power module through its second output terminal. After the switching unit turns on, the voltage regulator unit is activated and feeds back the first regulated voltage value to the optocoupler. The optocoupler transmits the signal to the primary PWM, and the power module outputs an initial low voltage to light the tungsten lamp.
[0026] Subsequently, the integral units with sequentially increasing time constants successively trigger the corresponding switching units to conduct, and each voltage regulation unit outputs an increasing regulated voltage value to the optocoupler in a preset order. The optocoupler continuously feeds these increasing signals back to the primary PWM, causing the output voltage of the power module to gradually rise until it reaches the rated value. Throughout the process, the connection between the second output terminal of the power module and the input terminal of the optocoupler ensures the real-time transmission of the feedback signal, while the grounding design of each unit provides a stable potential reference for the circuit, ensuring the accuracy of signal transmission.
[0027] Furthermore, referring to Figure 2 , Figure 2 This is a circuit diagram of the special tungsten lamp power supply circuit provided in the embodiments of this application, combined with... Figure 2As can be seen, the special tungsten lamp power supply circuit provided in this application embodiment includes three RC integration modules; The first RC integration module includes a first integration unit, a first switching unit, and a first voltage regulation unit; The second RC integration module includes a second integration unit, a second switching unit, and a second voltage regulation unit; The third RC integrator module includes a third integrator unit, a third switching unit, and a third voltage regulator unit.
[0028] Each RC integrator module independently comprises an integrator unit, a switching unit, and a voltage regulator unit, with increasing time constants and regulated voltage values set sequentially in the order of first, second, and third. When the power module starts up, its output signal is simultaneously input to the integrator units of all three modules. However, due to the difference in time constants, the integrator unit of the third RC integrator module (with the smallest time constant) completes charging and discharging first, triggering the third switching unit to conduct. At this point, the third voltage regulator unit is activated and feeds back the initial regulated voltage value to the optocoupler, allowing the power module to output a low voltage to start the tungsten lamp. Subsequently, the second RC integrator module (with a slightly larger time constant) triggers the second switching unit to conduct after a delay, and the second voltage regulator unit provides a higher regulated voltage value, further increasing the power supply voltage. Finally, the first RC integrator module (with the largest time constant) triggers the first switching unit to conduct, and the first voltage regulator unit outputs the maximum regulated voltage value, bringing the power supply voltage to its rated value.
[0029] Specifically, in the embodiments of this application, the first integration unit includes a first resistor and a first capacitor; the first switching unit includes a first transistor; and the first voltage regulation unit includes a first Zener diode. The first output terminal of the power module is connected to one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor and one end of the first capacitor, and the other end of the first capacitor is grounded. The emitter of the first transistor is grounded, the collector of the first transistor is connected to the positive terminal of the first Zener diode, and the negative terminal of the first Zener diode is connected to the output terminal of the optocoupler.
[0030] Among them, the first resistor and the first capacitor form an RC integrating circuit in the first integrating unit, which generates a voltage signal that changes with time through the current limiting of the resistor and the charging and discharging characteristics of the capacitor; the first transistor is the core of the first switching unit, which controls the conduction state of the collector and emitter through the base voltage to realize the switching of the circuit on and off; the first Zener diode is the key device of the first voltage regulating unit, which has the characteristic of maintaining a stable voltage across its terminals after reverse breakdown, and is used to provide a reference voltage signal.
[0031] When the power module starts supplying power, current flows through the first resistor to the first capacitor and the base of the first transistor. Since the first capacitor is initially uncharged, the voltage across it is zero, and the transistor base is in a cutoff state due to insufficient voltage. As the power signal continues to be input, current flows through the first resistor to charge the first capacitor, and the voltage across the capacitor gradually increases (this process is called RC integration). When the voltage rises to the conduction threshold of the first transistor, the transistor base receives a trigger signal, and conduction occurs between the collector and emitter, forming a current path.
[0032] After the transistor is turned on, a voltage is applied to the positive terminal of the first Zener diode connected to its collector. When the voltage reaches the reverse breakdown voltage of the Zener diode, the Zener diode breaks down and stabilizes at the preset voltage value. At this time, the negative terminal of the Zener diode is connected to the output terminal of the optocoupler. The stable voltage signal is transmitted to the primary PWM control terminal through the optocoupler. The PWM adjusts the output voltage of the power module accordingly to provide the initial start-up voltage for the tungsten lamp. At the same time, the other end of the first capacitor is grounded to ensure the stability and predictability of voltage changes during integration, while the grounding of the transistor's emitter provides a return path for the current after conduction, ensuring the normal operation of the circuit.
[0033] Furthermore, the second integration unit includes a second resistor and a second capacitor; the second switching unit includes a second transistor; and the second voltage regulation unit includes a second Zener diode. The first output terminal of the power module is connected to one end of the second resistor, the other end of the second resistor is connected to the base of the second transistor and one end of the second capacitor, and the other end of the second capacitor is grounded. The emitter of the second transistor is grounded, the collector of the second transistor is connected to the positive terminal of the second Zener diode, and the negative terminal of the second Zener diode is connected to the output terminal of the optocoupler.
[0034] The third integration unit includes a third resistor and a third capacitor; the third switching unit includes a third transistor; the third voltage regulation unit includes a third Zener diode; The first output terminal of the power module is connected to one end of the third resistor, the other end of the third resistor is connected to the base of the third transistor and one end of the third capacitor, and the other end of the third capacitor is grounded. The emitter of the third transistor is grounded, the collector of the third transistor is connected to the positive terminal of the third Zener diode, and the negative terminal of the third Zener diode is connected to the output terminal of the optocoupler.
[0035] Specifically, the connection method and working principle of the second and third RC integrator modules are similar to those of the first RC integrator module. After the power is turned on, the integrator unit charges the capacitor through the resistor. When the capacitor voltage rises to the conduction threshold of the corresponding transistor, the transistor conducts, triggering the Zener diode to break down and output a stable voltage to the optocoupler, thereby regulating the power supply output voltage.
[0036] More specifically, as the time constants of the three modules increase sequentially, the second RC integral module will be delayed in conducting after the third module is triggered, while the first RC integral module will be triggered last. Furthermore, the Zener diodes of the three modules have sequentially increasing voltage values. This allows the first and second RC integral modules to feed back higher voltage values sequentially based on the initial voltage provided by the third RC integral module, thereby driving the power supply voltage to increase in stages and ultimately achieving a smooth transition of the tungsten lamp from startup to stable operation.
[0037] In this embodiment, the breakdown voltage of the first Zener diode is 4.7V; the capacitance of the first capacitor is 47μF; the breakdown voltage of the second Zener diode is 6.2V; the capacitance of the second capacitor is 22μF; the breakdown voltage of the third Zener diode is 8.2V; the capacitance of the third capacitor is 10μF; and the resistors in the first, second, and third integrating units are all 100K.
[0038] Specifically, breakdown voltage refers to the stable voltage value maintained across the Zener diode after reverse breakdown; capacitance is a measure of a capacitor's ability to store charge, determining the charging and discharging speed (i.e., time constant) of the RC integrator circuit; resistance is the resistor's opposition to current, and together with capacitance, they constitute the time constant (τ=R×C) of the RC integrator circuit. As capacitance increases sequentially (10μF→22μF→47μF), the time constant also increases sequentially. In this embodiment, the resistors in the three integrator units are all 100KΩ to ensure circuit design consistency, while the differences in capacitance and breakdown voltage achieve graded timing control and voltage regulation.
[0039] Secondly, this application provides an electronic device equipped with the aforementioned special tungsten lamp power supply circuit.
[0040] The above is a detailed description of the preferred embodiments of this application. However, the invention of this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A special tungsten lamp power supply circuit, characterized in that, include: The system includes a power supply module, multiple RC integration modules, and an optocoupler; each RC integration module includes an integration unit, a switching unit, and a voltage regulation unit; the time constants of all integration units and the voltage regulation values of all voltage regulation units are different. The first output terminal of the power module is connected to the first input terminal of the integration unit in each of the RC integration modules, the first output terminals of all the integration units are grounded, and the second output terminals of all the integration units are connected to the first input terminal of the switching unit in the corresponding RC integration module. The output terminals of all switching units are grounded, and the second input terminals of all switching units are connected to the output terminals of the voltage regulation units in the corresponding RC integration modules. The input terminals of all voltage regulator units are connected to the output terminals of the optocoupler, and the input terminals of the optocoupler are connected to the second output terminal of the power module. After the power module starts supplying power, it sequentially turns on each RC integral module according to the time constant of each RC integral module, thereby providing the optocoupler with multiple increasing regulated voltage values to achieve power supply transition.
2. The special tungsten lamp power supply circuit according to claim 1, characterized in that, include: Three RC integration modules; The first RC integration module includes a first integration unit, a first switching unit, and a first voltage regulation unit; The second RC integration module includes a second integration unit, a second switching unit, and a second voltage regulation unit; The third RC integrator module includes a third integrator unit, a third switching unit, and a third voltage regulator unit.
3. The special tungsten lamp power supply circuit according to claim 2, characterized in that, The first integrating unit includes a first resistor and a first capacitor; the first switching unit includes a first transistor; the first voltage regulating unit includes a first Zener diode; The first output terminal of the power module is connected to one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor and one end of the first capacitor, and the other end of the first capacitor is grounded. The emitter of the first transistor is grounded, the collector of the first transistor is connected to the positive terminal of the first Zener diode, and the negative terminal of the first Zener diode is connected to the output terminal of the optocoupler.
4. The special tungsten lamp power supply circuit according to claim 3, characterized in that, The breakdown voltage of the first Zener diode is 4.7V; the capacitance of the first capacitor is 47μF.
5. The special tungsten lamp power supply circuit according to claim 2, characterized in that, The second integrating unit includes a second resistor and a second capacitor; the second switching unit includes a second transistor; the second voltage regulating unit includes a second Zener diode; The first output terminal of the power module is connected to one end of the second resistor, the other end of the second resistor is connected to the base of the second transistor and one end of the second capacitor, and the other end of the second capacitor is grounded. The emitter of the second transistor is grounded, the collector of the second transistor is connected to the positive terminal of the second Zener diode, and the negative terminal of the second Zener diode is connected to the output terminal of the optocoupler.
6. The special tungsten lamp power supply circuit according to claim 5, characterized in that, The breakdown voltage of the second Zener diode is 6.2V; the capacitance of the second capacitor is 22μF.
7. The special tungsten lamp power supply circuit according to claim 2, characterized in that, The third integration unit includes a third resistor and a third capacitor; the third switching unit includes a third transistor; the third voltage regulation unit includes a third Zener diode; The first output terminal of the power module is connected to one end of the third resistor, the other end of the third resistor is connected to the base of the third transistor and one end of the third capacitor, and the other end of the third capacitor is grounded. The emitter of the third transistor is grounded, the collector of the third transistor is connected to the positive terminal of the third Zener diode, and the negative terminal of the third Zener diode is connected to the output terminal of the optocoupler.
8. The special tungsten lamp power supply circuit according to claim 7, characterized in that, The breakdown voltage of the third Zener diode is 8.2V; the capacitance of the third capacitor is 10μF.
9. The special tungsten lamp power supply circuit according to claim 2, characterized in that, The resistors in the first integration unit, the second integration unit, and the third integration unit are all 100K.
10. An electronic device, characterized in that, It is equipped with a special tungsten lamp power supply circuit as described in any one of claims 1-9.