HID filament lamp compatible with inductive ballast

Abstract

The utility model discloses an HID filament lamp compatible with an inductive ballast, which comprises a driving circuit and a filament lamp bulb light bar, and is characterized in that the driving circuit comprises an input protection unit for overcurrent protection and is connected with the inductive ballast; the pre-stage resistance-capacitance voltage reduction unit is connected with the inductive ballast and is used for receiving the output constant power of the inductive ballast and adjusting the output constant power to reduce the voltage and the current; the filtering unit is connected between the output end of the input protection unit and the input end of the pre-stage resistance-capacitance voltage reduction unit and is used for inhibiting electromagnetic interference; the rear-stage voltage doubling rectifying unit is connected with the output end of the input protection unit and the output end of the front-stage resistance-capacitance voltage reduction unit and used for boosting voltage so as to reduce front-stage energy efficiency loss, and a filament lamp bulb light bar is connected to the output end of the rear-stage voltage doubling rectifying unit; the output discharging unit is connected in parallel with the output end of the rear-stage voltage doubling rectifying unit and is used for balancing the discharging current; the utility model has the advantages of realizing perfect compatibility with North America inductance ballasts, improving the energy efficiency and reducing the cost.

Description

Technical Field

[0001] This utility model relates to a lamp, and more particularly to a HID (High-Intensity Discharge) filament lamp compatible with an inductive ballast. Background Technology

[0002] High-intensity discharge (HID) lamps, as efficient lighting sources, are widely used in road lighting, industrial lighting, and other fields. In the infrastructure of the North American market, traditional HID lamps (such as metal halide lamps) generally use inductive ballast driving schemes. This driving method has unique system characteristics, including: constant power output, high open-circuit voltage (typically 2-5kV), and the need for specific triggering circuits to establish arc discharge.

[0003] In recent years, significant changes have occurred in the lighting technology field. With the gradual phasing out of traditional HID lamps, HID filament lamps, as a new type of lighting product, have gradually gained market attention. Unlike the light-emitting mechanism of traditional HID lamps, HID filament lamps use a specially structured filament as the light-emitting element, offering advantages such as rapid start-up and high luminous efficacy. However, this new lighting product faces severe technical challenges when adapting to existing inductive ballasts. The main problem lies in the fundamental mismatch between the constant power output characteristics of existing inductive ballasts and the stable low-voltage, high-current drive required by HID filament lamps. Specifically, the fixed power output of existing inductive ballasts cannot be effectively utilized by HID filament lamps, resulting in excess power being applied to the load. This causes excessive current in the load, leading to unnecessary damage and severely impacting the lifespan of the HID filament lamp.

[0004] Currently, there are two main types of compatible inductive ballast solutions on the market: the first type is to simply connect a power resistor in series in the circuit. Although this method can limit the current, it will bring additional energy loss. The second type is to use an electronic adapter solution. Although it improves the power matching problem, it has problems with system complexity and cost.

[0005] In-depth analysis reveals that the essence of the problem lies in the fact that existing compatible inductive ballast solutions fail to fundamentally resolve the contradiction between the constant power output characteristics of inductive ballasts and the requirements of HID filament lamps. Existing technologies either sacrifice energy efficiency (such as series power resistor solutions) or increase system complexity (such as electronic adapter solutions), both of which struggle to meet practical application needs. This application requirement is particularly urgent in the context of the current lighting industry upgrade, necessitating a new lighting solution that can fully utilize existing inductive ballast infrastructure. An ideal compatible solution should achieve safe and efficient operation of HID filament lamps without modifying existing inductive ballasts, while maintaining a competitive cost. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a HID filament lamp that is compatible with inductive ballasts. Through innovative design of the driving circuit, it solves the shortcomings of existing HID filament lamps in terms of compatibility, energy efficiency, circuit stability, safety and cost, achieves perfect compatibility with traditional North American inductive ballasts, improves energy efficiency, enhances circuit stability, ensures safe use and reduces costs.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a HID filament lamp compatible with inductive ballasts, comprising a driving circuit and a filament lamp bulb strip, characterized in that the driving circuit includes:

[0008] An input protection unit is connected to one output terminal of the inductive ballast for overcurrent protection;

[0009] The pre-stage RC step-down unit is connected to the other output terminal of the inductive ballast. It is used to receive the constant output power of the inductive ballast and perform power regulation to reduce the output voltage and output current of the inductive ballast.

[0010] A filtering unit is connected between the output terminal of the input protection unit and the input terminal of the pre-stage RC step-down unit to suppress electromagnetic interference.

[0011] The post-stage voltage multiplier rectifier unit is connected to the output terminal of the input protection unit and the output terminal of the pre-stage RC step-down unit, respectively, to boost the voltage and reduce the energy loss of the pre-stage RC step-down unit. The filament lamp bulb strip is connected to the output terminal of the post-stage voltage multiplier rectifier unit.

[0012] The output discharge unit is connected in parallel to the output terminal of the subsequent voltage doubler rectifier unit to balance the discharge current.

[0013] The drive circuit also includes a temperature protection unit for real-time monitoring of circuit temperature and execution of protective actions. This temperature protection unit is connected to the preceding resistor-capacitor step-down unit. By adding the temperature protection unit, the circuit temperature can be monitored in real time, and protective actions can be executed when the temperature is abnormal. This effectively prevents drive circuit failure and damage due to excessive temperature, ensuring that the HID filament lamp can operate normally for extended periods. Compared to traditional metal halide lamps, this HID filament lamp is more adaptable to the modern market. The temperature protection function enables the HID filament lamp to operate stably under different environmental conditions, enhancing its adaptability to complex operating environments and broadening its application range.

[0014] The input protection unit consists of a fusible resistor. One end of the fusible resistor is connected to one output terminal of the inductive ballast, and the other end is connected to both the filter unit and the subsequent voltage doubler rectifier unit. This defines the specific structure of the input protection unit. When an abnormal overcurrent occurs in the drive circuit, the fusible resistor can melt in time, cutting off the drive circuit and protecting other components in the drive circuit from damage, thus improving the safety of the drive circuit. The fusible resistor is a simple and effective protection measure; it has a simple structure, low cost, and can reliably perform overcurrent protection.

[0015] The pre-stage RC step-down unit consists of a first RC step-down capacitor and a second RC step-down capacitor. The temperature protection unit consists of a negative temperature coefficient (NTC) thermistor. One end of the NTC thermistor is connected to one end of the second RC step-down capacitor, and their common connection terminal is connected to the other output terminal of the inductive ballast. The other end of the NTC thermistor is connected to one end of the first RC step-down capacitor, and the other end of the first RC step-down capacitor is connected to the other end of the second RC step-down capacitor. Their common connection terminal is connected to the subsequent voltage doubler rectifier unit. This defines the specific structures of the pre-stage RC step-down unit and the temperature protection unit. By organically combining the first RC step-down capacitor, the second RC step-down capacitor, and the NTC thermistor, the first RC step-down capacitor is disconnected when the temperature reaches a set threshold. This makes the drive circuit more stable during operation, effectively responding to various abnormal situations and improving the stability and reliability of the HID filament lamp.

[0016] The filtering unit consists of a filtering capacitor. One end of the filtering capacitor is connected to the other end of the fuse resistor. The common connection terminal of one end of the negative temperature coefficient thermistor and one end of the second RC step-down capacitor is connected to the other end of the filtering capacitor. This defines the specific structure of the filtering unit. Using a filtering capacitor can effectively filter out high-frequency interference signals in the drive circuit, further suppress electromagnetic interference, improve the anti-interference capability of the drive circuit, ensure the stable operation of the drive circuit, and enhance the electromagnetic compatibility of the HID filament lamp.

[0017] The post-stage voltage multiplier rectifier unit consists of a first rectifier diode, a second rectifier diode, a first energy storage electrolytic capacitor, and a second energy storage electrolytic capacitor. The positive terminal of the first rectifier diode is connected to the negative terminal of the second rectifier diode, and their common connection terminal is connected to the common connection terminal of the other end of the first RC step-down capacitor and the other end of the second RC step-down capacitor. The negative terminal of the first energy storage electrolytic capacitor is connected to the positive terminal of the second energy storage electrolytic capacitor, and their common connection terminal is connected to the other end of the fuse resistor. The negative terminal of the first rectifier diode is connected to the positive terminal of the first energy storage electrolytic capacitor, and their common connection terminal is connected to the positive terminal of the filament lamp bulb strip. The positive terminal of the second rectifier diode is connected to the negative terminal of the second energy storage electrolytic capacitor, and their common connection terminal is connected to the negative terminal of the filament lamp bulb strip. The subsequent voltage multiplier rectifier unit efficiently rectifies the input AC voltage into the required DC voltage, while increasing the output voltage and reducing the output current, ensuring that the filament lamp bulb strip operates normally within a controllable range, thus improving rectification efficiency and voltage regulation accuracy. The energy storage electrolytic capacitor plays the role of energy storage and release, effectively smoothing the output voltage, reducing voltage fluctuations, and improving the stability of the drive circuit. At the same time, it can respond quickly during drive circuit startup and load changes, providing stable current output and ensuring the normal operation of the filament lamp bulb strip.

[0018] The output discharge unit consists of a first discharge resistor, a second discharge resistor, a third discharge resistor, and a fourth discharge resistor. These four resistors are connected sequentially. The end of the first discharge resistor not connected to the second discharge resistor is connected to the common terminal of the negative terminal of the first rectifier diode and the positive terminal of the first energy storage electrolytic capacitor. The end of the fourth discharge resistor not connected to the third discharge resistor is connected to the common terminal of the positive terminal of the second rectifier diode and the negative terminal of the second energy storage electrolytic capacitor. The common terminal of the second and third discharge resistors is connected to the other end of the fuse resistor. Using multiple discharge resistors effectively balances the discharge current, preventing excessive current from damaging the filament lamp, bulb, or light bar. Furthermore, in case of a malfunction in the drive circuit, the discharge resistors can quickly release energy, protecting other components in the drive circuit from damage.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] 1) Through the synergistic effect of the input protection unit, the pre-stage RC step-down unit, the filter unit, the post-stage voltage multiplier rectifier unit, and the output discharge unit, HID filament lamps can be perfectly compatible with North American inductive ballasts without modifying existing North American inductive ballasts.

[0021] 2) The pre-stage RC step-down unit can effectively reduce the output voltage and output current of the inductive ballast. Since filament lamps and bulb strips require higher voltage and lower current, the post-stage voltage doubler rectifier unit is used to boost the voltage. Under the same power, only a smaller current is needed. This design ensures that the filament lamps and bulb strips work normally within a controllable range, improves the stability and reliability of HID filament lamps, and reduces unnecessary energy loss.

[0022] 3) The filter unit effectively suppresses electromagnetic interference in the drive circuit, ensures the stable operation of the drive circuit, and improves the electromagnetic compatibility of HID filament lamps.

[0023] 4) The output discharge unit is designed to prevent excessive current from damaging the filament lamp, bulb, and light bar, thus extending the lifespan of the HID filament lamp.

[0024] 5) Compared to using an electronic adapter solution, the system complexity and cost are both lower. Attached Figure Description

[0025] Figure 1 This is a schematic block diagram of the driving circuit for the HID filament lamp of this utility model.

[0026] Figure 2 This is a circuit diagram of the driving circuit for the HID filament lamp of this utility model. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] This utility model proposes an HID filament lamp compatible with inductive ballasts, such as... Figure 1As shown, it includes a driving circuit and a filament lamp bulb strip 7. The driving circuit includes an input protection unit 1, connected to one output terminal of the inductive ballast 9, for overcurrent protection; a pre-stage RC step-down unit 2, connected to the other output terminal of the inductive ballast 9, for receiving the constant output power of the inductive ballast 9 and performing power regulation to reduce the output voltage and output current of the inductive ballast 9; a filter unit 3, connected between the output terminal of the input protection unit 1 and the input terminal of the pre-stage RC step-down unit 2, for suppressing electromagnetic interference; and a post-stage voltage doubler rectifier unit 4, connected to the output terminal of the input protection unit 1 and the pre-stage RC step-down unit 2 respectively. The output terminal of Unit 2 is connected to boost the voltage to reduce the energy loss of the front-stage RC step-down unit 2. The filament lamp bulb strip 7 is connected to the output terminal of the rear-stage voltage multiplier rectifier unit 4. Under a certain power requirement, the higher voltage allows the current requirement of the filament lamp bulb strip 7 to be smaller, thus the lifespan of the filament lamp bulb strip 7 is longer with a smaller current under the same luminous flux requirement. The output discharge unit 5 is connected in parallel to the output terminal of the rear-stage voltage multiplier rectifier unit 4 to balance the discharge current. The temperature protection unit 6 is used to monitor the circuit temperature in real time and perform protection actions, and is connected to the front-stage RC step-down unit 2.

[0029] As a preferred solution, such as Figure 2As shown, the input protection unit 1 consists of a fuse resistor F1; the pre-stage RC step-down unit 2 consists of a first RC step-down capacitor C1 and a second RC step-down capacitor C2; the temperature protection unit 6 consists of a negative temperature coefficient thermistor NTC; the filter unit 3 consists of a filter capacitor C3; the post-stage voltage doubler rectifier unit 4 consists of a first rectifier diode D1, a second rectifier diode D2, a first energy storage electrolytic capacitor C4, and a second energy storage electrolytic capacitor C5; and the output discharge unit 5 consists of a first discharge resistor R1, a second discharge resistor R2, a third discharge resistor R3, and a fourth discharge resistor R4. One end of the fuse resistor F1 is connected to one output terminal of the inductive ballast 9. One end of the negative temperature coefficient thermistor NTC is connected to one end of the second RC step-down capacitor C2, and their common connection terminal is connected to the other output terminal of the inductive ballast 9. The other end of the negative temperature coefficient thermistor NTC is connected to one end of the first RC step-down capacitor C1. The other end of the first RC step-down capacitor C1 is connected to the other end of the second RC step-down capacitor C2. One end of the filter capacitor C3 is connected to the other end of the fuse resistor F1. The common connection terminal of one end of the negative temperature coefficient thermistor NTC and one end of the second RC step-down capacitor C2 is connected to the other end of the filter capacitor C3. The positive terminal of the first rectifier diode D1 is connected to the second rectifier diode. The negative terminal of diode D2 is connected, and their common connection terminal is connected to the other end of the first RC step-down capacitor C1 and the other end of the second RC step-down capacitor C2. The negative terminal of the first energy storage electrolytic capacitor C4 is connected to the positive terminal of the second energy storage electrolytic capacitor C5, and their common connection terminal is connected to the other end of the fuse resistor F1. The negative terminal of the first rectifier diode D1 is connected to the positive terminal of the first energy storage electrolytic capacitor C4, and their common connection terminal is connected to the positive terminal LED+ of the filament lamp bulb strip 7. The positive terminal of the second rectifier diode D2 is connected to the negative terminal of the second energy storage electrolytic capacitor C5, and their common connection terminal is connected to the filament lamp bulb strip 7. The negative terminal of the LED strip 7 is connected to the first discharge resistor R1, the second discharge resistor R2, the third discharge resistor R3, and the fourth discharge resistor R4 in sequence. The end of the first discharge resistor R1 that is not connected to the second discharge resistor R2 is connected to the common connection terminal of the negative terminal of the first rectifier diode D1 and the positive terminal of the first energy storage electrolytic capacitor C4. The end of the fourth discharge resistor R4 that is not connected to the third discharge resistor R3 is connected to the common connection terminal of the positive terminal of the second rectifier diode D2 and the negative terminal of the second energy storage electrolytic capacitor C5. The common connection terminal of the second discharge resistor R2 and the third discharge resistor R3 is connected to the other end of the fuse resistor F1.

[0030] By adding a temperature protection unit 6, the circuit temperature can be monitored in real time and protective actions can be performed when the temperature is abnormal. This effectively prevents the drive circuit from malfunctioning and being damaged due to excessive temperature, ensuring that the HID filament lamp can work normally for a long time. Compared with traditional metal halide lamps, this HID filament lamp is more adaptable to the modern market. The temperature protection function enables the HID filament lamp to work stably under different environmental conditions, enhancing its adaptability to complex operating environments and broadening its application range. When an abnormal overcurrent occurs in the drive circuit, the fuse resistor F1 can melt in time, cutting off the drive circuit and protecting other components in the drive circuit from damage, thus improving the safety of the drive circuit. The fuse resistor F1 is a simple and effective protection measure with a simple structure and low cost, and can reliably perform the overcurrent protection function. By organically combining the first RC step-down capacitor C1, the second RC step-down capacitor C2, and the negative temperature coefficient thermistor NTC, the first RC step-down capacitor C1 is disconnected when the temperature reaches the set threshold, making the drive circuit more stable during operation and effectively dealing with various abnormal situations, thus improving the stability and reliability of the HID filament lamp. The use of filter capacitor C3 effectively filters out high-frequency interference signals in the drive circuit, further suppressing electromagnetic interference, improving the anti-interference capability of the drive circuit, ensuring stable operation of the drive circuit, and enhancing the electromagnetic compatibility of the HID filament lamp. The subsequent voltage doubler rectifier unit 4 efficiently rectifies the input AC voltage to the required DC voltage, while increasing the output voltage and reducing the output current, ensuring the filament lamp bulb strip 7 operates normally within a controllable range, improving rectification efficiency and voltage regulation accuracy. The energy storage electrolytic capacitor plays a role in energy storage and release, effectively smoothing the output voltage, reducing voltage fluctuations, and improving the stability of the drive circuit. It also provides a stable current output during drive circuit startup and load changes, ensuring the normal operation of the filament lamp bulb strip 7. Using multiple discharge resistors effectively balances the discharge current, preventing excessive current from damaging the filament lamp bulb strip 7. Furthermore, in case of drive circuit malfunction, the discharge resistors can quickly release energy, protecting other components in the drive circuit from damage.

[0031] Figure 2The working principle of the specific driving circuit shown is as follows: After the inductive ballast 9 is powered on, it outputs a high voltage. The high voltage is input to the fuse resistor F1, and after being filtered by the filter capacitor C3 to reduce electromagnetic influence, it passes the FCC test (North American EMC test). The high voltage is reduced by the front-stage RC step-down unit 2, which consists of the first RC step-down capacitor C1 (which can adjust the current) and the second RC step-down capacitor C2 (the reduction range is determined by the capacitance values ​​of the first RC step-down capacitor C1 and the second RC step-down capacitor C2). The negative temperature coefficient thermistor NTC detects the temperature. When the temperature reaches 75℃, it will disconnect the first RC step-down capacitor C1, reducing the input current of the filament lamp bulb strip 7 and thus reducing the power. Since the filament lamp bulb strip 7 cannot withstand excessive current, it needs to pass through the rear-stage voltage multiplier rectifier unit 4, which consists of the first rectifier diode D1, the second rectifier diode D2, the first energy storage electrolytic capacitor C4, and the second energy storage electrolytic capacitor C5, to increase the voltage, thereby reducing the current of the filament lamp bulb strip 7 and enabling the filament lamp bulb strip 7 to work normally.

Claims

1. A HID filament lamp compatible with inductive ballasts, comprising a driving circuit and a filament lamp bulb strip, characterized in that... The driving circuit includes: An input protection unit is connected to one output terminal of the inductive ballast for overcurrent protection; The pre-stage RC step-down unit is connected to the other output terminal of the inductive ballast. It is used to receive the constant output power of the inductive ballast and perform power regulation to reduce the output voltage and output current of the inductive ballast. A filtering unit is connected between the output terminal of the input protection unit and the input terminal of the pre-stage RC step-down unit to suppress electromagnetic interference. The post-stage voltage multiplier rectifier unit is connected to the output terminal of the input protection unit and the output terminal of the pre-stage RC step-down unit, respectively, to boost the voltage and reduce the energy loss of the pre-stage RC step-down unit. The filament lamp bulb strip is connected to the output terminal of the post-stage voltage multiplier rectifier unit. The output discharge unit is connected in parallel to the output terminal of the subsequent voltage doubler rectifier unit to balance the discharge current.

2. The HID filament lamp compatible with inductive ballasts according to claim 1, characterized in that... The drive circuit also includes a temperature protection unit for real-time monitoring of the circuit temperature and performing protective actions, and the temperature protection unit is connected to the front-stage resistor-capacitor step-down unit.

3. The HID filament lamp compatible with inductive ballasts according to claim 2, characterized in that... The input protection unit consists of a fuse resistor. One end of the fuse resistor is connected to one output terminal of the inductive ballast, and the other end of the fuse resistor is connected to the filter unit and the subsequent voltage doubler rectifier unit.

4. The HID filament lamp compatible with inductive ballasts according to claim 3, characterized in that... The pre-stage RC step-down unit consists of a first RC step-down capacitor and a second RC step-down capacitor. The temperature protection unit consists of a negative temperature coefficient thermistor. One end of the negative temperature coefficient thermistor is connected to one end of the second RC step-down capacitor, and their common connection terminal is connected to the other output terminal of the inductive ballast. The other end of the negative temperature coefficient thermistor is connected to one end of the first RC step-down capacitor, and the other end of the first RC step-down capacitor is connected to the other end of the second RC step-down capacitor. Their common connection terminal is connected to the post-stage voltage multiplier rectifier unit.

5. The HID filament lamp compatible with inductive ballasts according to claim 4, characterized in that... The filtering unit consists of a filtering capacitor, one end of which is connected to the other end of the fuse resistor. The common connection terminal of one end of the negative temperature coefficient thermistor and one end of the second RC step-down capacitor is connected to the other end of the filtering capacitor.

6. The HID filament lamp compatible with inductive ballasts according to claim 5, characterized in that... The post-stage voltage multiplier rectifier unit consists of a first rectifier diode, a second rectifier diode, a first energy storage electrolytic capacitor, and a second energy storage electrolytic capacitor. The positive terminal of the first rectifier diode is connected to the negative terminal of the second rectifier diode, and their common connection terminal is connected to the common connection terminal of the other end of the first RC step-down capacitor and the other end of the second RC step-down capacitor. The negative terminal of the first energy storage electrolytic capacitor is connected to the positive terminal of the second energy storage electrolytic capacitor, and their common connection terminal is connected to the other end of the fuse resistor. The negative terminal of the first rectifier diode is connected to the positive terminal of the first energy storage electrolytic capacitor, and their common connection terminal is connected to the positive terminal of the filament lamp bulb strip. The positive terminal of the second rectifier diode is connected to the negative terminal of the second energy storage electrolytic capacitor, and their common connection terminal is connected to the negative terminal of the filament lamp bulb strip.

7. The HID filament lamp compatible with inductive ballasts according to claim 6, characterized in that... The output discharge unit consists of a first discharge resistor, a second discharge resistor, a third discharge resistor, and a fourth discharge resistor. The first discharge resistor, the second discharge resistor, the third discharge resistor, and the fourth discharge resistor are connected in sequence. The end of the first discharge resistor that is not connected to the second discharge resistor is connected to the common connection terminal of the negative terminal of the first rectifier diode and the positive terminal of the first energy storage electrolytic capacitor. The end of the fourth discharge resistor that is not connected to the third discharge resistor is connected to the common connection terminal of the positive terminal of the second rectifier diode and the negative terminal of the second energy storage electrolytic capacitor. The common connection terminal of the second discharge resistor and the third discharge resistor is connected to the other end of the fuse resistor.

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