A halogen lamp-based input voltage fluctuation protection circuit

Abstract

The application relates to the technical field of circuits, and discloses an input voltage fluctuation protection circuit based on a halogen lamp, which comprises a first branch, an energy storage circuit and a second branch. One end of the first branch is connected to one end of the energy storage circuit, so as to provide a smoothed voltage for the energy storage circuit. The other end of the energy storage circuit is respectively connected to the other end of the first branch and one end of the second branch, so as to store the required charge of the smoothed voltage and release energy in the case of voltage fluctuation of the first branch, and provide a smooth voltage for the second branch. The other end of the second branch is connected to the energy storage circuit, so as to receive the smooth voltage to drive the halogen lamp. The first branch comprises a power supply and an anti-reverse circuit connected in sequence. The second branch comprises an output circuit and the halogen lamp connected in sequence. The technical scheme provided by the application can effectively inhibit the influence of voltage fluctuation caused by a vehicle-mounted high-power electrical load on the brightness of the halogen lamp, and avoid flickering or brightness change of the halogen lamp.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to an input voltage fluctuation protection circuit based on a halogen lamp. Background Technology

[0002] In vehicle control systems, power supply stability is crucial for the normal operation of electrical equipment, especially voltage fluctuations caused by high-power loads (such as window motors and heating pads). These fluctuations are transmitted through the impedance and inductive reactance of cables, potentially causing brightness fluctuations or flickering of halogen lamps, affecting driving safety. Particularly when loads such as heating pads are operating, the power supply voltage changes significantly, resulting in noticeable variations in halogen lamp brightness.

[0003] Therefore, how to effectively suppress the impact of voltage fluctuations caused by high-power electrical loads on the brightness of halogen lamps and avoid flickering or brightness changes is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides an input voltage fluctuation protection circuit based on halogen lamps, which effectively suppresses the impact of voltage fluctuations caused by high-power electrical loads on the brightness of halogen lamps, and avoids flickering or brightness changes.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, embodiments of this application provide an input voltage fluctuation protection circuit based on a halogen lamp, comprising a first branch, an energy storage circuit, and a second branch; One end of the first branch is connected to one end of the energy storage circuit to provide a smoothed voltage to the energy storage circuit; the other end of the energy storage circuit is connected to the other end of the first branch and one end of the second branch respectively to store the charge required for the smoothed voltage and release energy in the event of voltage fluctuations in the first branch to provide a stable voltage for the second branch. The other end of the second branch is connected to the energy storage circuit to receive the stable voltage to drive the halogen lamp; The first branch includes a power supply and a reverse protection circuit connected in sequence; The second branch includes an output circuit and a halogen lamp connected in sequence.

[0006] This embodiment provides an input voltage fluctuation protection circuit for halogen lamps. Through the synergistic action of a series of components, it effectively suppresses the impact of voltage fluctuations caused by high-power electrical loads in vehicles on the brightness of the halogen lamps. After the power supply provides the initial voltage, the energy storage circuit releases energy during voltage fluctuations to further stabilize the voltage. Furthermore, the reverse voltage protection circuit ensures the correct voltage direction, preventing reverse voltage from interfering with the circuit. The output circuit converts the stored electrical energy into a relatively smooth voltage power network for the halogen lamp, thereby ensuring stable brightness and preventing flickering or brightness variations. Through these designs, the entire circuit maintains stable operation under voltage fluctuations, improving reliability and the user experience of the halogen lamps.

[0007] In one embodiment, the anti-reverse circuit includes: a battery, a charge pump circuit, a semiconductor field-effect transistor, and a capacitor; the semiconductor field-effect transistor is disposed outside the charge pump circuit; One end of the battery is connected to the first end of the capacitor and the first end of the semiconductor field-effect transistor; the other end of the battery is connected to the ground terminal in the charge pump circuit; the first end of the capacitor is also connected to the anode terminal in the charge pump circuit, and the second end of the capacitor is connected to the charge pump terminal in the charge pump circuit; the first end of the semiconductor field-effect transistor is also connected to the anode terminal in the charge pump circuit, the second end of the semiconductor field-effect transistor is connected to the cathode terminal in the charge pump circuit, and the third end of the semiconductor field-effect transistor is connected to the gate terminal in the charge pump circuit.

[0008] In this embodiment, the battery provides a stable power supply to the circuit, and the charge pump circuit regulates the voltage to ensure that battery voltage fluctuations have minimal impact on the load. The capacitor smooths voltage fluctuations, storing and releasing charge to prevent voltage instability from directly affecting the halogen lamp. The semiconductor field-effect transistor (FET) further stabilizes the voltage flow by rapidly responding to voltage changes and preventing reverse current. Overall, the coordinated operation of these components ensures that the halogen lamp's voltage fluctuations are controlled within a reasonable range, avoiding flickering or brightness changes caused by voltage fluctuations, thereby improving the stability of the vehicle's electrical system.

[0009] In one embodiment, the anti-reverse circuit includes: a battery, a charge pump circuit, a semiconductor field-effect transistor, and a capacitor; the semiconductor field-effect transistor is disposed inside the charge pump circuit; One end of the battery is connected to the first end of the capacitor and the anode of the charge pump circuit; the other end of the battery is connected to the ground terminal of the charge pump circuit; the first end of the capacitor is also connected to the anode of the charge pump circuit, and the second end of the capacitor is connected to the charge pump terminal of the charge pump circuit; the first end of the semiconductor field-effect transistor is also connected to the anode of the charge pump circuit, and the second end of the semiconductor field-effect transistor is connected to the cathode of the charge pump circuit.

[0010] In this embodiment, the battery provides a stable power supply, ensuring voltage fluctuations remain within a reasonable range. The charge pump circuit maintains stable output voltage through buck-boost regulation, ensuring voltage stability even under load fluctuations. The capacitor smooths voltage fluctuations by storing and releasing charge, further reducing the magnitude of voltage changes. The semiconductor field-effect transistor quickly cuts off current when the voltage reverses, preventing reverse current from flowing back to the battery, thus protecting the circuit and load. These components work together to achieve precise voltage control, effectively suppressing the impact of high-power on-board electrical loads on the brightness of halogen lamps and avoiding flickering or brightness variations.

[0011] In one embodiment, the energy storage circuit includes: capacitor C1, capacitor C2, and inductor L1; One end of capacitor C1 is connected to one end of inductor L1 and one end of the output circuit; the other end of capacitor C1 is connected to one end of the halogen lamp, the second end of capacitor C2 and one end of the power supply; the first end of capacitor C2 is connected to the other end of inductor L1 and the anti-reverse circuit; the second end of capacitor C2 is connected to one end of the power supply, the other end of capacitor C1 and the other end of the halogen lamp.

[0012] The configuration of capacitors C1 and C2 in this embodiment allows for smooth energy storage and release. When inductor L1 releases its stored energy, capacitors C1 and C2 work together to provide the necessary charge to support the stable operation of the halogen lamp. Simultaneously, the inclusion of an anti-reverse circuit ensures that when the voltage at the energy storage circuit terminal is higher than the input power supply voltage, the energy storage circuit will not reverse-sink current into other networks. This prevents energy from flowing back from the energy storage circuit to the power supply or other circuit components, thus protecting the stability and safety of the circuit. Precise current flow regulation in the output circuit ensures a stable voltage supply to the halogen lamp, avoiding instability caused by voltage fluctuations. Through the interaction of these components, the energy storage circuit can effectively suppress voltage fluctuations caused by high-power electrical loads in the vehicle under load fluctuations, thereby stabilizing the brightness of the halogen lamp and preventing flickering or brightness variations.

[0013] In one embodiment, the semiconductor field-effect transistor is an N-channel MOS transistor.

[0014] In one embodiment, the anti-reverse circuit is a diode.

[0015] In one embodiment, the energy storage circuit is a capacitor C1.

[0016] This embodiment effectively suppresses voltage fluctuations caused by high-power electrical loads in vehicles by using diodes, a reverse protection circuit, and capacitor C1, thereby preventing flickering or brightness changes in the halogen lamp. The diode, acting as a reverse protection circuit, protects the circuit from reverse current, ensuring the stable operation of capacitor C1 and other components. Capacitor C1 smooths out power supply voltage fluctuations by storing and releasing energy. When the voltage drops due to load changes, the capacitor releases energy to maintain voltage stability, thus preventing brightness fluctuations in the halogen lamp caused by voltage instability. Finally, the output circuit precisely regulates the current flow to the halogen lamp, ensuring a stable and consistent lamp brightness. Overall, this circuit maintains a constant brightness of the halogen lamp while stabilizing the power supply voltage and reducing voltage fluctuations, avoiding flickering caused by voltage fluctuations.

[0017] In one embodiment, the output circuit is a metal-oxide-semiconductor field-effect transistor.

[0018] In one embodiment, the other end of the power supply is grounded.

[0019] In one embodiment, the other end of the first branch is also connected to a load drive unit. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an input voltage fluctuation protection circuit based on a halogen lamp provided for an embodiment of this application; Figure 2 A schematic diagram of a first type of anti-reverse circuit provided in an embodiment of this application; Figure 3 A schematic diagram of a second type of anti-reverse circuit provided in an embodiment of this application; Figure 4 A schematic diagram of an energy storage circuit provided in an embodiment of this application; Figure 5 The schematic diagram shows that the anti-reverse circuit provided in the embodiments of this application is a diode. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In vehicle control systems, power supply stability is crucial for the normal operation of various electrical devices. High-power electrical loads, in particular (such as window motors and heaters), generate significant voltage fluctuations during operation. Since the vehicle controller's power supply is typically connected to the vehicle's electrical circuits via a power input terminal, voltage fluctuations at the input terminal are transmitted into the circuitry due to the impedance and inductive reactance of the cable. These fluctuations can be caused by various factors, the most common being voltage fluctuations generated by high-power electrical devices (such as window motors and heaters). These voltage fluctuations not only interfere with other electrical systems within the vehicle but can also cause problems such as flickering or brightness variations in halogen lamps.

[0024] Halogen lamps, as a common type of vehicle lighting equipment, are often affected by power supply fluctuations, especially when the voltage is unstable or fluctuates significantly. Since the light intensity of halogen lamps is directly related to voltage changes, fluctuations in the supply voltage can cause noticeable flickering or changes in brightness, affecting the driver's visual experience and safety.

[0025] Specifically, window motors and heating pads are typical high-power electrical loads. Window motors typically require PWM drive signals of 10kHz to 20kHz, while heating pads usually have higher drive voltages and require a specific PWM drive frequency during operation, typically in the range of a few hertz to tens of hertz. When voltage fluctuations from these loads are conducted through the vehicle's wiring harness, voltage fluctuations at the power supply end become unavoidable due to the impedance and inductive reactance of the harness.

[0026] For example, when a heating pad is in operation, due to its large driving voltage and low PWM driving frequency, the input capacitor value is insufficient to smooth out voltage fluctuations, causing significant changes in the voltage at the power supply end. This change can lead to significant fluctuations in the brightness of the halogen lamp, or even flickering, especially when the voltage fluctuation frequency is within the range perceptible to the human eye.

[0027] In contrast, while car window motors operate at higher frequencies, their controllers typically incorporate large-capacity electrolytic capacitors, which mitigate voltage fluctuations to some extent, thus minimizing their impact on the power supply voltage. However, when the motor is under heavy load, it can still cause some voltage fluctuations, affecting the brightness of the halogen lamps. In such cases, the halogen lamps may dim while the window motor is running, and return to normal brightness after the motor stops operating.

[0028] Therefore, how to effectively suppress the impact of voltage fluctuations caused by high-power electrical loads on the brightness of halogen lamps and avoid flickering or brightness changes is a technical problem that urgently needs to be solved.

[0029] According to an embodiment of this application, an embodiment of an input voltage fluctuation protection circuit based on a halogen lamp is provided. Figure 1 A schematic diagram of an input voltage fluctuation protection circuit based on a halogen lamp provided in this application embodiment is shown below. Figure 1 As shown, it includes: First branch, energy storage circuit and second branch; One end of the first branch is connected to one end of the energy storage circuit to provide a smoothed voltage to the energy storage circuit; The other end of the energy storage circuit is connected to the other end of the first branch and one end of the second branch, respectively, to store the charge required for the smoothed voltage and release energy in case of voltage fluctuations in the first branch, so as to provide a stable voltage for the second branch; the other end of the second branch is connected to the energy storage circuit to receive the stable voltage to drive the halogen lamp. The first branch includes a power supply and a reverse protection circuit connected in sequence; The second branch includes an output circuit and a halogen lamp connected in sequence.

[0030] Specifically, the power supply provides the initial voltage to the circuit. The reverse voltage protection circuit ensures that the energy storage circuit does not flow backwards into other networks when the voltage at the energy storage circuit terminal is higher than the input power supply voltage. This prevents energy from flowing back from the energy storage circuit to the power supply or other circuit parts, thus protecting the stability and safety of the circuit. The energy storage circuit is used to store charge and convert energy. The output circuit converts the energy in the energy storage circuit into a voltage suitable for the halogen lamp. The halogen lamp, as the load of the circuit, lights up when the voltage is applied.

[0031] Specifically, when the power is turned on, the power supply provides an initial voltage, and voltage begins to flow. Due to the inherent properties of the wiring harness's impedance and inductive reactance, current fluctuations can affect the voltage, consequently impacting the halogen lamp's brightness and potentially causing flickering. To ensure stable brightness, a reverse-current protection circuit first ensures that current flows in only one direction. When the voltage at the energy storage circuit terminal is higher than the input power supply voltage, the reverse-current protection circuit prevents the energy storage circuit from backflowing into other networks. This prevents energy from flowing back from the energy storage circuit to the power supply or other circuit components, thus protecting the circuit's stability and safety. The current ultimately enters the energy storage circuit, which stores charge, ensuring voltage stability and providing additional energy when needed by the load. When the power supply voltage fluctuates, the energy storage circuit releases the stored energy to maintain voltage stability, preventing brightness changes or flickering of the halogen lamp caused by power supply voltage fluctuations. The output circuit converts the energy in the energy storage circuit into a voltage suitable for the halogen lamp, ensuring it emits light at a constant brightness. Finally, the voltage passes through the halogen lamp, causing it to emit light. Because the voltage is stable, the halogen lamp's brightness remains constant. The grounding section of the entire circuit ensures its stability and safety, preventing voltage fluctuations from affecting other parts of the circuit. The other end of the first branch is also connected to the load drive unit.

[0032] This embodiment provides an input voltage fluctuation protection circuit for halogen lamps. Through the synergistic action of a series of components, it effectively suppresses the impact of voltage fluctuations caused by high-power electrical loads in vehicles on the brightness of halogen lamps. After the power supply provides the initial voltage, the reverse protection circuit ensures that the energy storage circuit will not reverse-sink current to other networks when the voltage at the energy storage circuit terminal is higher than the input power supply voltage. This prevents energy from flowing back from the energy storage circuit to the power supply or other circuit parts, thereby protecting the stability and safety of the circuit. The output circuit converts the stored electrical energy into a relatively smooth voltage power network for the halogen lamp, thereby ensuring stable brightness of the halogen lamp and avoiding flickering or brightness variations. Through these designs, the entire circuit maintains stable operation under voltage fluctuations, improving reliability and the user experience of halogen lamps.

[0033] Figure 2 This is a schematic diagram of a first anti-reverse circuit provided in an embodiment of this application. The anti-reverse circuit includes: a battery, a charge pump circuit, a semiconductor field-effect transistor (SFET), and a capacitor. The SFET is disposed outside the charge pump circuit. One end of the battery is connected to the first end of the capacitor and the first end of the SFET. The other end of the battery is connected to the ground terminal in the charge pump circuit. The first end of the capacitor is also connected to the anode terminal in the charge pump circuit, and the second end of the capacitor is connected to the charge pump terminal in the charge pump circuit. The first end of the SFET is also connected to the anode terminal in the charge pump circuit, the second end of the SFET is connected to the cathode terminal in the charge pump circuit, and the third end of the SFET is connected to the gate terminal in the charge pump circuit.

[0034] The battery, as the power source of the circuit, provides DC power to the entire circuit, ensuring a stable input voltage source for the charge pump circuit. The stability of the battery directly determines the basic fluctuation range of the power supply voltage. When operating under high-power loads, the battery's output voltage may change due to load fluctuations; therefore, other circuit components must be used to balance these fluctuations. The basic function of the charge pump circuit is to use switching elements to boost or reduce the input DC voltage to meet the needs of other circuits. The charge pump circuit regulates voltage through switches and energy storage elements (capacitors) and can provide a more stable output voltage during power supply fluctuations, preventing voltage fluctuations from directly affecting downstream equipment, such as halogen lamps. Through efficient charge pump design, voltage changes can be effectively controlled, avoiding excessive fluctuations and ensuring the stability of halogen lamps. Capacitors play a crucial role in the circuit, especially in smoothing voltage fluctuations. By storing charge and releasing electrical energy during voltage fluctuations, capacitors can smooth power supply fluctuations. When high-power loads (such as car window motors, heating pads, etc.) cause voltage fluctuations, capacitors can absorb some of the sudden voltage changes, effectively eliminating voltage spikes and mitigating the direct impact of voltage fluctuations on halogen lamps, thus preventing flickering caused by voltage fluctuations. A semiconductor field-effect transistor (FET), as a switching element, regulates the current between the source and drain by controlling the gate voltage. The FET is an N-channel MOSFET. By appropriately controlling the gate voltage, the FET can precisely control the current flow. When the output voltage of the charge pump circuit reaches a certain threshold, the FET's gate voltage turns it on, allowing current to flow to the charge pump circuit. If the current flows in the reverse direction, the FET automatically turns off, preventing current from flowing back to the battery, thus preventing reverse current flow and protecting the circuit from damage caused by reverse voltage. This is especially important in halogen lamp power systems, where reverse current can damage the circuit or burn out the halogen lamp.

[0035] Specifically, the battery provides power to the circuit, preparing the charge pump circuit and the semiconductor field-effect transistor (FET). The charge pump circuit begins operation, during which capacitors charge or discharge to support its voltage conversion function. The gate of the FET is controlled by the output voltage of the charge pump circuit. When the gate voltage reaches a certain threshold, the FET turns on, allowing current to flow from the source to the drain. Voltage flows from the positive terminal of the battery, through the FET, and then to the cathode of the charge pump circuit. The capacitor smooths the voltage during this process. If current attempts to flow in the reverse direction, the FET turns off, preventing current from flowing back to the battery, thus protecting the circuit. The voltage processed by the charge pump circuit is used as the output voltage to power subsequent circuitry. This ensures that current flows only in one direction, preventing damage to the halogen lamp due to reverse current.

[0036] In this embodiment, the battery provides a stable power supply to the circuit, and the charge pump circuit regulates the voltage to ensure that battery voltage fluctuations have minimal impact on the load. The capacitor smooths voltage fluctuations, storing and releasing charge to prevent voltage instability from directly affecting the halogen lamp. The semiconductor field-effect transistor (FET) responds quickly to voltage changes, preventing reverse current and further stabilizing current flow. Overall, the coordinated operation of these components ensures that the halogen lamp's voltage fluctuations are controlled within a reasonable range, avoiding flickering or brightness changes caused by voltage fluctuations, thereby improving the stability of the vehicle's electrical system.

[0037] Figure 3 This is a schematic diagram of a second anti-reverse circuit provided in an embodiment of this application. The anti-reverse circuit includes: a battery, a charge pump circuit, a semiconductor field-effect transistor (SFET), and a capacitor. The SFET is disposed inside the charge pump circuit. One end of the battery is connected to the first end of the capacitor and the anode terminal of the charge pump circuit. The other end of the battery is connected to the ground terminal of the charge pump circuit. The first end of the capacitor is also connected to the anode terminal of the charge pump circuit, and the second end of the capacitor is connected to the charge pump terminal of the charge pump circuit. The first end of the SFET is also connected to the anode terminal of the charge pump circuit, and the second end of the SFET is connected to the cathode terminal of the charge pump circuit.

[0038] The battery, as the power source of the circuit, provides DC power to the entire circuit, ensuring a stable input voltage source for the charge pump circuit. The stability of the battery directly determines the basic fluctuation range of the power supply voltage. When operating under high-power loads, the battery's output voltage may change due to load fluctuations; therefore, other circuit components must be used to balance these fluctuations. The basic function of the charge pump circuit is to use switching elements to boost or reduce the input DC voltage to meet the needs of other circuits. The charge pump circuit regulates voltage through switches and energy storage elements (capacitors) and can provide a more stable output voltage during power supply fluctuations, preventing voltage fluctuations from directly affecting downstream equipment, such as halogen lamps. Through efficient charge pump design, voltage changes can be effectively controlled, avoiding excessive fluctuations and ensuring the stability of halogen lamps. Capacitors play a crucial role in the circuit, especially in smoothing voltage fluctuations. By storing charge and releasing electrical energy during voltage fluctuations, capacitors can smooth power supply fluctuations. When high-power loads (such as car window motors, heating pads, etc.) cause voltage fluctuations, capacitors can absorb some of the sudden voltage changes, effectively eliminating voltage spikes and mitigating the direct impact of voltage fluctuations on halogen lamps, thus preventing flickering caused by voltage fluctuations. A semiconductor field-effect transistor (FET), as a switching element, regulates the current between the source and drain by controlling the gate voltage. The FET is an N-channel MOSFET. By appropriately controlling the gate voltage, the FET can precisely control the current flow. When the output voltage of the charge pump circuit reaches a certain threshold, the FET's gate voltage turns it on, allowing current to flow to the charge pump circuit. If the current flows in the reverse direction, the FET automatically turns off, preventing current from flowing back to the battery, thus preventing reverse current flow and protecting the circuit from damage caused by reverse voltage. This is especially important in halogen lamp power systems, where reverse current can damage the circuit or burn out the halogen lamp.

[0039] Specifically, the battery provides the input voltage to the circuit, and the charge pump circuit and semiconductor field-effect transistor (FET) are ready. The charge pump circuit begins operation, regulating the output voltage based on the input voltage through the charging and discharging process of the capacitor, ensuring voltage stability. When the battery voltage fluctuates, the charge pump circuit can ensure that the voltage output remains unaffected by adjusting the charging and discharging method of the capacitor. The capacitor releases stored energy during voltage fluctuations, reducing the amplitude of voltage fluctuations and thus protecting sensitive loads such as halogen lamps in the circuit. The FET acts as a switching element when the charge pump circuit is operating, controlling the current flow between the source and drain by adjusting the gate voltage. When the current reverses, the FET automatically cuts off to prevent reverse current flow and ensure circuit safety.

[0040] In this embodiment, the battery provides a stable power supply, ensuring voltage fluctuations remain within a reasonable range. The charge pump circuit maintains stable output voltage through buck-boost regulation, ensuring voltage stability even under load fluctuations. The capacitor smooths voltage fluctuations by storing and releasing charge. The semiconductor field-effect transistor quickly cuts off current when the voltage reverses, preventing reverse current from flowing back to the battery, thus protecting the circuit and load. These components work together to achieve precise voltage control, effectively suppressing the impact of high-power on-board electrical loads on halogen lamp brightness and preventing flickering or brightness variations.

[0041] Figure 4 The diagram below shows an energy storage circuit provided in an embodiment of this application. The energy storage circuit includes: capacitor C1, capacitor C2, and inductor L1; one end of capacitor C1 is connected to one end of inductor L1 and one end of the output circuit; the other end of capacitor C1 is connected to one end of the halogen lamp, the second end of capacitor C2, and one end of the power supply; the first end of capacitor C2 is connected to the other end of inductor L1 and the reverse protection circuit; the second end of capacitor C2 is connected to one end of the power supply, the other end of capacitor C1, and the other end of the halogen lamp.

[0042] Specifically, capacitor C1 is connected to inductor L1 on one side and to the halogen lamp and power supply on the other. When current flows through it, capacitor C1 stores charge and provides a stable voltage supply to the halogen lamp. When inductor L1 releases energy, capacitor C1 releases its stored charge to maintain voltage stability and prevent voltage fluctuations. Capacitor C2 provides additional charge storage and voltage stability during current flow. Connected to the reverse current protection circuit and power supply, capacitor C2 reduces fluctuations caused by reverse current flow, thus smoothing the output voltage and ensuring stable halogen lamp illumination. Inductor L1, as the core component for energy conversion and storage, stores electrical energy through its magnetic field. When the magnetic fields in capacitors C1 and C2 are released, inductor L1 releases its stored energy, supporting current flow to the halogen lamp. Inductor L1 reduces instantaneous voltage fluctuations during current flow, making the circuit's output voltage smoother and preventing brightness fluctuations in the halogen lamp caused by excessively high or low voltage. The main function of the reverse current protection circuit is to prevent reverse current from flowing into the battery or other critical components. It can quickly cut off reverse voltage, thus protecting the circuit from damage. Especially when inductor L1 releases energy, a momentary reverse current phenomenon may occur. The anti-reverse circuit protects the battery and load device by cutting off these reverse currents. Preferably, the output circuit is a metal-oxide-semiconductor field-effect transistor, which controls the flow of charge provided by capacitors C1 and C2 to the halogen lamp. By precisely adjusting the switching operation, it ensures that the output current flows stably to the halogen lamp at the correct time.

[0043] It should also be noted that the capacitance and inductance values ​​for capacitors C1 and C2 and inductor L1 need to be configured as follows: Where I is the current; t is the time of current fluctuation; ΔU is the allowable voltage drop; ΔI / Δt represents the rate of change of current, U L This represents the voltage that the inductor needs to compensate for. The required capacitance value can be calculated. For example, if the halogen lamp current is 100mA, the allowable voltage drop is 1V, and the fluctuation period is 100ms, then the calculated required capacitance value is 10mF.

[0044] The configuration of capacitors C1 and C2 in this embodiment allows for smooth energy storage and release. When inductor L1 releases its stored energy, capacitors C1 and C2 work together to provide the necessary charge to support the stable operation of the halogen lamp. Simultaneously, the inclusion of a reverse current protection circuit ensures that when the voltage at the energy storage circuit terminal is higher than the input power supply voltage, the reverse current protection circuit prevents the energy storage circuit from flowing back into other networks. This avoids energy flowing back from the energy storage circuit to the power supply or other circuit components, thus protecting the stability and safety of the circuit. Precise current flow regulation in the output circuit ensures a stable voltage supply to the halogen lamp, avoiding instability caused by voltage fluctuations. Through the interaction of these components, the energy storage circuit can effectively suppress voltage fluctuations caused by high-power electrical loads in the vehicle under load fluctuations, thereby stabilizing the brightness of the halogen lamp and preventing flickering or brightness variations.

[0045] In a preferred embodiment, the anti-reverse circuit is a diode. The energy storage circuit is a capacitor C1. Please refer to [link / reference]. Figure 5 The reverse protection circuit provided in this application embodiment is a schematic diagram of a diode. The diode allows current to flow only from the anode to the cathode in the circuit, preventing damage to the metal-oxide-semiconductor field-effect transistor, capacitor C1, or halogen lamp from reverse voltage. When the power supply is normal, the diode conducts in the forward direction, and current flows to subsequent circuits. When the power supply is disconnected or reversed, the diode cuts off in the reverse direction, blocking the reverse current flow and thus protecting the circuit. Capacitor C1 smooths power supply voltage fluctuations, reducing instantaneous voltage spikes or fluctuations caused by vehicle circuits or other loads, and maintaining a stable voltage supply to the circuit. When the power supply voltage is higher than the voltage across the capacitor, capacitor C1 begins to charge, and the voltage across the capacitor gradually increases. When the power supply voltage drops or fluctuates instantaneously, capacitor C1 provides voltage to the circuit by releasing stored energy. This "buffering" effect reduces flickering of the halogen lamp caused by voltage drops. The metal-oxide-semiconductor field-effect transistor acts as a switch or current regulator, controlling the voltage flowing to the halogen lamp. The halogen lamp acts as the load of the circuit; when the metal-oxide-semiconductor field-effect transistor is turned on, current flows through the halogen lamp, illuminating it. The metal-oxide-semiconductor field-effect transistor and capacitor C1 work together to ensure that the halogen lamp remains stable even if the power supply voltage drops for a short time.

[0046] Specifically, the power supply provides the initial voltage to the circuit, and current flows through the diode. The diode ensures that current flows in only one direction, preventing reverse current from damaging the circuit. Capacitor C1 charges and stores energy when the power supply is on. When the power supply voltage fluctuates or drops, capacitor C1 releases energy to maintain stable circuit operation. The metal-oxide-semiconductor field-effect transistor (MOSFET) controls its on / off state according to its gate voltage, thereby controlling the current flowing to the halogen lamp. When the MOSFET is on, current flows through the halogen lamp, illuminating it. The other end of the power supply is grounded to ensure the safe operation of the entire circuit, providing a reference voltage point.

[0047] This embodiment effectively suppresses voltage fluctuations caused by high-power electrical loads in vehicles by using diodes, a reverse protection circuit, and capacitor C1, thereby preventing flickering or brightness changes in the halogen lamp. The diode, acting as a reverse protection circuit, protects the circuit from reverse current, ensuring the stable operation of capacitor C1 and other components. Capacitor C1 smooths out power supply voltage fluctuations by storing and releasing energy. When the voltage drops due to load changes, the capacitor releases energy to maintain voltage stability, thus preventing brightness fluctuations in the halogen lamp caused by voltage instability. Finally, the output circuit precisely regulates the current flow to the halogen lamp, ensuring a stable and consistent lamp brightness. Overall, this circuit maintains a constant brightness of the halogen lamp while stabilizing the power supply voltage and reducing voltage fluctuations, avoiding flickering caused by voltage fluctuations.

[0048] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0050] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0051] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An input voltage fluctuation protection circuit based on a halogen lamp, characterized in that, include: First branch, energy storage circuit and second branch; One end of the first branch is connected to one end of the energy storage circuit to provide a smoothed voltage to the energy storage circuit; The other end of the energy storage circuit is connected to the other end of the first branch and one end of the second branch, respectively, so as to store the charge required for the smoothed voltage and release energy in the event of voltage fluctuations in the first branch, thereby providing a stable voltage for the second branch. The other end of the second branch is connected to the energy storage circuit to receive the stable voltage to drive the halogen lamp; The first branch includes a power supply and a reverse protection circuit connected in sequence; The second branch includes an output circuit and a halogen lamp connected in sequence.

2. The circuit according to claim 1, characterized in that, The anti-reverse circuit includes: a battery, a charge pump circuit, a semiconductor field-effect transistor (SFET), and a capacitor; the SFET is disposed outside the charge pump circuit; one end of the battery is connected to the first end of the capacitor and the first end of the SFET; the other end of the battery is connected to the ground terminal of the charge pump circuit; the first end of the capacitor is also connected to the anode terminal of the charge pump circuit, and the second end of the capacitor is connected to the charge pump terminal of the charge pump circuit; the first end of the SFET is also connected to the anode terminal of the charge pump circuit, the second end of the SFET is connected to the cathode terminal of the charge pump circuit, and the third end of the SFET is connected to the gate terminal of the charge pump circuit.

3. The circuit according to claim 1, characterized in that, The anti-reverse circuit includes: a battery, a charge pump circuit, a semiconductor field-effect transistor, and a capacitor; the semiconductor field-effect transistor is disposed inside the charge pump circuit; One end of the battery is connected to the first end of the capacitor and the anode of the charge pump circuit; the other end of the battery is connected to the ground terminal of the charge pump circuit; the first end of the capacitor is also connected to the anode of the charge pump circuit, and the second end of the capacitor is connected to the charge pump terminal of the charge pump circuit; the first end of the semiconductor field-effect transistor is also connected to the anode of the charge pump circuit, and the second end of the semiconductor field-effect transistor is connected to the cathode of the charge pump circuit.

4. The circuit according to claim 2 or 3, characterized in that, The energy storage circuit includes: capacitor C1, capacitor C2, and inductor L1; One end of capacitor C1 is connected to one end of inductor L1 and one end of the output circuit; the other end of capacitor C1 is connected to one end of the halogen lamp, the second end of capacitor C2 and one end of the power supply; the first end of capacitor C2 is connected to the other end of inductor L1 and the anti-reverse circuit; the second end of capacitor C2 is connected to one end of the power supply, the other end of capacitor C1 and the other end of the halogen lamp.

5. The circuit according to claim 2 or 3, characterized in that, The semiconductor field-effect transistor is an N-channel MOS transistor.

6. The circuit according to claim 1, characterized in that, The anti-reverse circuit is a diode.

7. The circuit according to claim 6, characterized in that, The energy storage circuit is capacitor C1.

8. The circuit according to claim 1, characterized in that, The output circuit is a metal-oxide-semiconductor field-effect transistor.

9. The circuit according to claim 1, characterized in that, The other end of the power supply is grounded.

10. The circuit according to claim 1, characterized in that, The other end of the first branch is also connected to a load drive unit.

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