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HID lamp power supplying method, circuit used by same and working method of circuit

A technology of power supply circuit and power supply method, which is applied to electric light sources, electrical components, lighting devices, etc., can solve the problems of chip drive circuit damage, overvoltage breakdown, switching element Q1 damage, etc., and achieves low impedance and high circuit reliability. , the effect of improving reliability

Active Publication Date: 2013-10-09
佛山肆强科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There are still the following problems in the existing full-bridge circuit: 1. When the HID lamp is ignited once or multiple times or abnormal conditions occur, the DC1 (VS inside the chip) terminal will inevitably have a positive voltage greater than the withstand voltage limit of the chip. High-voltage pulse or negative high-voltage pulse (generated by the ignition coil); the positive / negative high-voltage pulse impacts the drive circuit at the VS terminal inside the chip, and it is easy to cause overvoltage to damage the high-end / low-side drive circuit of the chip; 2. Due to the drive of the switching element Q1 The voltage (charging voltage value close to VCC) needs to be provided by the capacitor C2 controlled by the high-end drive circuit. When the DC1 terminal is unstable due to ignition and abnormal conditions (positive / negative high-voltage pulses), the voltage on the capacitor C2 will also follow the DC1 ( The internal VS) voltage of the chip changes and changes, which causes Q1 to be turned on or during the turn-on period, and the voltage between the gate G / source S is undervoltage or too high due to the HO voltage being too high / low, resulting in damage to the switching element Q1; 3. The positive high-voltage pulse or negative high-voltage pulse at the DC1 terminal forms a voltage difference between the source S and the drain D of Q1, which is likely to cause overvoltage breakdown of the drain / source (D / S) of Q1; similarly, Q3 also has the above problems
The ignition voltage changes randomly during the entire life of the lamp, and fixed absorption / suppression parameters cannot fully guarantee the safety of the circuit. Therefore, in electronic ballasts using a full-bridge circuit, damage to the switching elements of the full-bridge circuit is the result of damage to the electronic ballast The most common occurrence in the electronic ballast affects the development of

Method used

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  • HID lamp power supplying method, circuit used by same and working method of circuit
  • HID lamp power supplying method, circuit used by same and working method of circuit
  • HID lamp power supplying method, circuit used by same and working method of circuit

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Embodiment 1

[0050] The power supply method for the HID lamp in this embodiment adopts two power supplies connected in parallel to supply power to the HID lamp in turn; the on-off time and output waveform of each power supply are controlled and realized by the control module according to the type requirements of the HID lamp; the power supplies connected in parallel take turns The power supply for the HID lamp means that the two power supply circuits are respectively equipped with switching elements whose on-off state is controlled by the control module, and the switching elements are set at the same potential. The power supply method of the present invention uses two power supplies connected in parallel to replace the upper tube and the high-end drive chip part of the full bridge, which avoids the situation that the upper tube is easily damaged when the full bridge circuit is used for power supply, and improves reliability; the on-off and output waveforms of the power supply Controlled by ...

Embodiment 2

[0052] In this embodiment, the HID lamp power supply circuit, such as figure 2 As shown; includes a PWM control module, a first transformer module, a second transformer module and switching elements Q2 and Q3. The first transformer module and the second transformer module are used to control the voltage output time and convert the DC voltage of the input DC power supply into a PWM-type square wave voltage; the first transformer module and the second transformer module are respectively connected in parallel to the input DC power supply At both ends, the first transformer module and the second transformer module are used as the lighting power supply to supply power to the load in turn; the load is composed of a HID lamp and an ignition coil connected in series; the first transformer module and the second transformer module are respectively connected to both ends of the load . Supplying power to the load through the first transformation module forms a first loop, and supplying ...

Embodiment 3

[0069] The power supply circuit of this embodiment is as Figure 5 As shown, the difference from the power supply circuit in Embodiment 2 is that D1 of the first transformer module is connected between the second connection point of the secondary of T1 and the negative terminal of the lighting power supply, and the anode of D1 is connected to the negative terminal of the lighting power supply. , the cathode of D1 is connected to the second secondary connection point of T1; the structure of the second transformer module is the same as that of the first transformer module. Q2 is connected in parallel to both ends of D1, and Q3 is connected in parallel to both ends of D2. Other parts of the power supply circuit in this embodiment are the same as those in Embodiment 2.

[0070] The principle of the power supply circuit in this embodiment is: Q2 conducts under the control of the PWM2 control signal to form a second loop powered by the second transformer module, and the current pat...

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PUM

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Abstract

The invention provides an HID lamp power supplying method, a circuit used by the HID lamp power supplying method and a working method of the circuit. The HID lamp power supplying method improves the reliability of power supplying of an HID lamp. The HID lamp power supplying circuit is externally connected at the two ends of an HID lamp load, is high in reliability and capable of ensuring that a lamp tube stably works in a flicker-free and jitter-free mode. The working method of the HID lamp power supplying circuit can be suitable for different types of HID lamps and meet different starting characteristic modes and power requirements.

Description

technical field [0001] The invention relates to the technical field of high-intensity gas discharge lamps, and more specifically, relates to a power supply for high-intensity gas discharge lamps. Background technique [0002] HID lamps, also known as high-intensity gas discharge lamps, need to work at lower frequency voltages to work stably (such as frequencies below 1kHz), and light flickering and jittering are prone to occur when working under high-frequency power supply conditions, such as Acoustic resonance phenomenon. [0003] At present, the mature HID lamp power supply in the market mainly includes three schemes: full bridge circuit, BUCK half bridge circuit and magnetic ballast: [0004] 1. Full-bridge circuit: The full-bridge circuit is composed of four switching elements. The full-bridge circuit can well provide the AC low-frequency working voltage (such as PWM square wave voltage) of the HID lamp, and the dead time is short, and the light is stable; because the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/288
Inventor 张龙李永付张杰
Owner 佛山肆强科技有限公司