HID (High Intensity Discharge) driving signal processing device controlled by PID (Proportion Integration Differentiation) and HID lamp

Abstract

The utility model discloses an HID (High Intensity Discharge) driving signal processing device controlled by PID (Proportion Integration Differentiation) and an HID lamp, and relates to the technical field of HID driving. The device comprises an EMI filtering and rectifying circuit, a PFC circuit and an MOS tube half-bridge frequency selection network which are connected in sequence. The control end of the MOS tube half-bridge frequency selection network is connected with the main control circuit, and the MOS tube half-bridge frequency selection network is driven by the main control circuit to output a pair of complementary PWM (Pulse Width Modulation) waves with dead zones and provide waveform voltage for driving an HID (High Intensity Discharge) lamp; the main control circuit adopts a TMS320F28335 chip, and drives an MOS (Metal Oxide Semiconductor) tube half-bridge frequency selection network through an MOS isolation driving circuit; and the main control circuit acquires a voltage value acquired by the bus voltage acquisition circuit and an input current value acquired by the LTSR current sampling circuit, adjusts the output of the MOS tube half-bridge frequency selection network according to a PID control algorithm, and drives the HID lamp to work at a specified frequency band. According to the HID driving signal processing device applying PID control and the HID lamp provided by the utility model, the sound resonance problem is avoided, the lighting effect is improved, and the service life of the HID lamp is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of HID driving, in particular to an HID driving signal processing device and an HID lamp using PID control. Background Art

[0002] Gas discharge light sources, such as fluorescent lamps, metal halide lamps, mercury vapor lamps, high-pressure sodium lamps, and low-pressure sodium lamps, are classified as low-pressure gas discharge lamps, while mercury vapor lamps, metal halide lamps (Metal Halide), and high-pressure sodium lamps (HPS-High Pressure Sodium) are classified as high-pressure gas discharge lamps, also known as high-intensity gas discharge lamps (HID-High Intensity Discharge Lamp). Traditional inductive ballasts, due to their heavy weight and bulk, low power factor, and high energy loss, have low performance and limited application scenarios. Furthermore, their circuit structure cannot effectively adjust to power grid fluctuations in a timely manner, and they are gradually being replaced by electronic ballasts.

[0003] Analog electronic ballasts first appeared, offering low production costs and simple circuit structures, but their applications were limited. Subsequently, new high-frequency electronic ballasts emerged, offering advantages such as low energy consumption, compact size, low cost, strong adaptability, and stable luminescence. With the rise and rapid development of computer technology, digital control has rapidly evolved. Compared to traditional analog control technology, digital control circuits can more easily meet the various requirements specified by standards. Various single-chip microcomputers, such as the SG3525, have replaced control chips commonly used in circuit control modules to generate complementary PWM waves, achieving digital control.

[0004] While electric light sources bring light to mankind, they also bring new hazards to mankind due to their flickering, namely the stroboscopic effect. The existing technical countermeasures to improve the flickering of electric light sources are to increase the frequency of the driving power that drives the electric light source's light-emitting body to emit light, so that it reaches above 40KHz. The HID driving frequency in the existing technology is generally in the range of 20KHz-50KHz. However, the applicant found that when the operating frequency is 40KHz, the HID lamp will have acoustic resonance problems and produce stroboscopic phenomena. The acoustic resonance problem can cause the lamp arc to twist and deform, the light to flicker, affecting the lighting effect and lamp life. In severe cases, it can cause the arc to extinguish and even damage the lamp tube, affecting the normal use of the HID lamp. There are many types of acoustic resonance, and many factors that affect acoustic resonance. For lamps from different manufacturers, different batches, and even the same batch, the acoustic resonance frequency range of each lamp is different. In particular, as the service life of the lamp increases, its acoustic resonance point will change. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an HID drive signal processing device and an HID lamp using PID control. The device adopts the TMS320F28335 chip to construct a main control circuit, drives the MOS tube half-bridge frequency selection network through the MOS isolation drive circuit, and applies PID control to drive the HID lamp to operate stably in a specified frequency band, thereby avoiding the acoustic resonance problem of the HID lamp, improving the lighting effect, and extending the service life of the HID lamp.

[0006] In a first aspect, the present invention provides a HID drive signal processing device using PID control, comprising an EMI filter and rectifier circuit, a PFC circuit, and a MOS tube half-bridge frequency selection network connected in sequence. A mains voltage is connected to the EMI filter and rectifier circuit and converted into a DC pulsating voltage. The PFC circuit shapes the DC pulsating voltage into a stable DC voltage, which is then used to power the MOS tube half-bridge frequency selection network. A first output end of the MOS tube half-bridge frequency selection network is connected to one end of the HID lamp via a bus voltage acquisition circuit, and a second output end is connected to the other end of the HID lamp via an LTSR current sampling circuit. A control end of the MOS tube half-bridge frequency selection network is connected to a main control circuit and driven by the main control circuit to output a pair of complementary PWM waves with dead zones, providing a waveform voltage for driving the HID lamp.

[0007] The main control circuit adopts the TMS320F28335 chip and drives the MOS tube half-bridge frequency selection network through the MOS isolation drive circuit; the main control circuit obtains the input voltage value of the HID lamp collected by the bus voltage collection circuit and the input current value of the HID lamp collected by the LTSR current sampling circuit, and adjusts the output of the MOS tube half-bridge frequency selection network according to the PID control algorithm to drive the HID lamp to operate in the specified frequency band.

[0008] Furthermore, the designated frequency band is an 80KHz frequency band.

[0009] Furthermore, the MOS transistor half-bridge frequency selection network includes a SIC-MOS transistor Q1 and a SIC-MOS transistor Q2 connected in series. One end of the HID lamp is connected between the SIC-MOS transistor Q1 and the SIC-MOS transistor Q2 through a capacitor C and an inductor L, and the other end of the HID lamp is connected to the other end of the SIC-MOS transistor Q2.

[0010] Furthermore, the MOS isolation drive circuit adopts the UCC21520 chip, the input end of the UCC21520 chip passes through a low-pass filter to filter out noise in line transmission, and is connected to a 5V power supply for power supply; the output end of the UCC21520 chip is powered by 20V and -4V, so that the maximum value of the output PWM wave is 20V and the minimum value is -4V.

[0011] Furthermore, the output end of the UCC21520 chip outputs two PWM waves, each PWM wave output includes an on-current loop and a off-current loop, and each off-current loop includes a resistor and a Schottky diode.

[0012] Furthermore, the output end of the UCC21520 chip is powered by a QA01C power chip.

[0013] Furthermore, the bus voltage acquisition circuit includes a proportional amplification circuit composed of an operational amplifier OPA4350.

[0014] Furthermore, the LTSR current sampling circuit includes an LTSR closed-loop Hall element LSR6-NP.

[0015] In a second aspect, the present invention provides a HID lamp driven by the HID driving signal processing device using PID control as described in the first aspect.

[0016] The advantages of the present invention are:

[0017] The main control circuit is constructed using the TMS320F28335 chip, and the MOS tube half-bridge frequency selection network is driven by the MOS isolation drive circuit to output PWM wave. The main control circuit obtains the input voltage value of the HID lamp collected by the bus voltage acquisition circuit and the input current value of the HID lamp collected by the LTSR current sampling circuit, and applies PID control to drive the HID lamp to work stably in the specified frequency band, avoiding the acoustic resonance problem of the HID lamp, improving the lighting effect, and extending the service life of the HID lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural diagram of a HID drive signal processing device using PID control according to an embodiment of the present invention;

[0020] Figure 2 This is a circuit diagram of a MOS tube half-bridge frequency selection network in an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of a MOS tube isolation drive circuit in an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of a bus voltage acquisition circuit in an embodiment of the present utility model;

[0023] Figure 5 Schematic diagram of the LTSR current sampling circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings and specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] To achieve power control for electronic ballasts, extend HID lamp life, and achieve stable feedback, this device uses the TMS320F28335 as the primary control chip to build a PWM wave output control and signal negative feedback acquisition system for the HID driver circuit. This replaces the traditional hardware control plus analog circuit control method, outputting a pair of complementary PWM waves with a dead zone, ensuring stable HID operation. This device improves the reliability and robustness of the overall circuit, meeting the development trend of the next generation of electronic ballasts.

[0028] See also Figure 1As shown, this embodiment provides an HID drive signal processing device using PID control, including an EMI filter and rectifier circuit, a PFC circuit, and a MOS tube half-bridge frequency selection network connected in sequence. The mains voltage is connected to the EMI filter and rectifier circuit and converted into a DC pulsating voltage. The PFC circuit shapes the DC pulsating voltage into a stable DC voltage, which is used to power the MOS tube half-bridge frequency selection network. The first output end of the MOS tube half-bridge frequency selection network is connected to one end of the HID lamp through a bus voltage acquisition circuit, and the second output end is connected to the other end of the HID lamp through an LTSR current sampling circuit. The control end of the MOS tube half-bridge frequency selection network is connected to a main control circuit and is driven by the main control circuit to output a pair of complementary PWM waves with dead zones to provide a waveform voltage to drive the HID lamp.

[0029] The main control circuit uses the TMS320F28335 chip and drives the MOS transistor half-bridge frequency selection network via a MOS isolation driver circuit. The main control circuit obtains the HID lamp input voltage value collected by the bus voltage acquisition circuit and the HID lamp input current value collected by the LTSR current sampling circuit, and adjusts the output of the MOS transistor half-bridge frequency selection network according to a PID control algorithm to drive the HID lamp to operate within a specified frequency band. The main control circuit uses the TMS320F28335 chip and drives the MOS transistor half-bridge frequency selection network via a MOS isolation driver circuit. This significantly increases the upper limit of the HID lamp's operating frequency band. The main control circuit utilizes a conventional PID control algorithm to control the HID lamp to operate stably within the specified frequency band, thereby reducing lamp resonance, improving lighting quality, and extending the HID lamp's service life.

[0030] The main circuit is a MOS tube half-bridge frequency selection network, including a MOS tube half-bridge circuit and a frequency selection network. The MOS tube half-bridge frequency selection network mainly adopts the frequency modulation control method. The bus input voltage of the main circuit is loaded on the MOS tube half-bridge circuit, which is about 400V DC voltage. The TMS320F28335 drives the MOS tube half-bridge circuit to open and close through the MOS isolation drive circuit, thereby forming a periodic square wave, which is sent to the frequency selection network for resonant conversion.

[0031] Preferably, the HID lamp emits light stably at an operating frequency of 80 kHz, and no flicker is observed. Therefore, setting the designated frequency band to 80 kHz can effectively reduce the impact of lamp resonance.

[0032] In one possible implementation, Figure 2As shown, the MOS transistor half-bridge frequency selection network includes a series-connected SIC-MOS transistor Q1 and SIC-MOS transistor Q2. One end of the HID lamp is connected between SIC-MOS transistors Q1 and Q2 via capacitor C and inductor L. The other end of the HID lamp is connected to the other end of SIC-MOS transistor Q2. Because HID lamps exhibit resistive properties during steady-state operation, device R is used instead. U1 represents the bus voltage. By designing a MOS transistor half-bridge and RLC series resonant circuit, the power requirements of the HID lamp can be effectively met. This circuit structure achieves a large circuit gain, resulting in a large frequency shift, which facilitates sampling by the negative feedback sampling system and achieves narrowband control. When the entire circuit is in an inductive operating state, it can achieve zero-voltage turn-on of the switch.

[0033] Because the main control circuit uses the TMS320F28335 on-chip processing system, the current and voltage output from its pins need to be driven by a MOS transistor isolation driver circuit to open and close the SIC-MOS transistor. Considering the high power and unstable reference voltage surface of the MOS transistor half-bridge frequency selection network, the design requires consideration of the isolation of the digital and analog grounds for driving and sampling. The MOS transistor isolation driver circuit is implemented using the UCC21520 chip. The chip's input is filtered through a low-pass filter to remove noise from line transmission. The chip's output outputs two PWM waves, each of which includes an on-current loop and a off-current loop. The use of electrical isolation in this MOS transistor isolation driver circuit reduces the risk of current sinking caused by bus voltage.

[0034] To better distinguish the representation of digital ground and analog ground in the circuit diagram, such as Figure 3As shown, SGND is the digital ground, BGND is the analog ground, and the input end is on the left side of the dotted line. R12, R13, U7, and U8 form a low-pass filter to filter out noise in line transmission. At the same time, 5V is used to power the input end of UCC21520; the output end is on the right side of the dotted line. The 20V and -4V provided by QA01C are used to power the output end of UCC21520, so that the maximum value of the output PWM wave is 20V and the minimum value is -4V. This power supply combination is used to ensure the normal opening and closing of the MOS tube. In the upper and lower PWM waveforms, R19 and R21 form the turn-on current loop, while R15, R23, D4, and D6 form the turn-off current loop. The introduction of D4 and D6 separates the turn-on and turn-off current loops and accelerates MOS transistor switching. Therefore, Schottky diodes with fast turn-off and recovery times are used for D4 and D6. Small resistors are used for R15, R19, R21, and R23 to prevent false turn-on and circuit shorts caused by parasitic capacitance of the MOS transistor. The UCC21520's output port driver circuit is powered by the QA01C power supply chip, specifically designed for SICMOS transistor driver circuits. This chip provides the current and stable voltage required for SICMOS transistor switching.

[0035] This MOS tube isolation drive circuit uses the internal electrical isolation characteristics of the UCC21520 to convert the digitally generated PWM wave into a relative voltage PWM wave, making the PWM wave more stable. Due to the use of electrical isolation, this circuit can not only effectively prevent the bus current from flowing back into the main control circuit, but also, due to its good dv / dt characteristics, it alleviates the PWM wave pulse broadening problem caused by internal factors of the device, and can respond faster to step signals.

[0036] In a possible implementation, the bus voltage acquisition circuit includes a proportional amplifier circuit composed of an operational amplifier OPA4350, such as Figure 4 As shown, this circuit primarily achieves acquisition by transmitting and linearly amplifying voltage differences. The bus voltage acquisition circuit's input is the bus voltage relative to ground, with an amplification factor of -1. The circuit converts the bus voltage proportionally and outputs it to the voltage sampling terminal of the main control circuit. By acquiring the relative voltage relative to ground, the sampled voltage is more accurate, preventing ground fluctuations in the bus circuit from causing misjudgments in the main control circuit. The OPA4350 amplifier features rail-to-rail input and output characteristics. The circuit's input and output power rails exhibit very low swing, low noise (5nV / √Hz), and high-speed operation (38MHz, 22V / μs). Compared to conventional operational amplifiers, it has a wider dynamic voltage range, enabling highly accurate voltage sampling.

[0037] In a possible implementation, the LTSR current sampling circuit includes an LTSR closed-loop Hall element LSR6-NP, which is used to convert the current signal of the main circuit into a voltage within a limited range and plays a role in signal acquisition isolation. Figure 5 The circuit shown can achieve extremely small circuit parasitic resistance (approximately 0.18mΩ) and parasitic inductance (approximately 0.013μH). Due to the inherent characteristics of the Hall element, the circuit has high linearity and noise immunity within a certain current range.

[0038] The utility model also provides a HID lamp, which is driven by the HID driving signal processing device using PID control as described above.

[0039] The utility model adopts the TMS320F28335 chip to construct the main control circuit, drives the MOS tube half-bridge frequency selection network to output PWM wave through the MOS isolation drive circuit, and applies PID control to drive the HID lamp to stably operate in a specified frequency band by obtaining the input voltage value of the HID lamp collected by the bus voltage collection circuit and the input current value of the HID lamp collected by the LTSR current sampling circuit, thereby avoiding the acoustic resonance problem of the HID lamp, improving the lighting effect, and extending the service life of the HID lamp.

[0040] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A HID drive signal processing device using PID control, characterized in that: It includes an EMI filter rectifier circuit, a PFC circuit and a MOS tube half-bridge frequency selection network connected in sequence; the mains voltage is connected to the EMI filter rectifier circuit and converted into a DC pulsating voltage; the PFC circuit shapes the DC pulsating voltage into a stable DC voltage to supply power to the MOS tube half-bridge frequency selection network; the first output end of the MOS tube half-bridge frequency selection network is connected to one end of the HID lamp through a bus voltage acquisition circuit, and the second output end is connected to the other end of the HID lamp through an LTSR current sampling circuit; the control end of the MOS tube half-bridge frequency selection network is connected to a main control circuit, and is driven by the main control circuit to output a pair of complementary PWM waves with dead zones to provide a waveform voltage to drive the HID lamp; The main control circuit adopts the TMS320F28335 chip and drives the MOS tube half-bridge frequency selection network through the MOS isolation drive circuit; the main control circuit obtains the input voltage value of the HID lamp collected by the bus voltage collection circuit and the input current value of the HID lamp collected by the LTSR current sampling circuit, and adjusts the output of the MOS tube half-bridge frequency selection network according to the PID control algorithm to drive the HID lamp to work in the specified frequency band.

2. The device according to claim 1, characterized in that: The designated frequency band is the 80KHz frequency band.

3. The device according to claim 1, characterized in that: The MOS tube half-bridge frequency selection network includes a SIC-MOS tube Q1 and a SIC-MOS tube Q2 connected in series, one end of the HID lamp is connected between the SIC-MOS tube Q1 and the SIC-MOS tube Q2 through a capacitor C and an inductor L, and the other end of the HID lamp is connected to the other end of the SIC-MOS tube Q2.

4. The device according to claim 1, characterized in that: The MOS isolation drive circuit adopts the UCC21520 chip. The input end of the UCC21520 chip passes through a low-pass filter to filter out noise in line transmission, and is connected to a 5V power supply for power supply; the output end of the UCC21520 chip is powered by 20V and -4V, so that the maximum value of the output PWM wave is 20V and the minimum value is -4V.

5. The device according to claim 4, characterized in that: The output end of the UCC21520 chip outputs two PWM waves, each PWM wave output includes an on current loop and a off current loop, and each off current loop includes a resistor and a Schottky diode.

6. The device according to claim 4 or 5, characterized in that: The output end of the UCC21520 chip is powered by a QA01C power chip.

7. The device according to claim 1, characterized in that: The bus voltage acquisition circuit includes a proportional amplifier circuit composed of an operational amplifier OPA4350.

8. The device according to claim 1, characterized in that: The LTSR current sampling circuit includes an LTSR closed-loop Hall element LSR6-NP.

9. A HID lamp, characterized in that: The driving is performed by using the HID driving signal processing device using PID control as described in any one of claims 1 to 8.

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