WO2008128453A1 - Power supply device and light-adjusting method - Google Patents

Power supply device and light-adjusting method Download PDF

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Publication number
WO2008128453A1
WO2008128453A1 PCT/CN2008/070533 CN2008070533W WO2008128453A1 WO 2008128453 A1 WO2008128453 A1 WO 2008128453A1 CN 2008070533 W CN2008070533 W CN 2008070533W WO 2008128453 A1 WO2008128453 A1 WO 2008128453A1
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WO
WIPO (PCT)
Prior art keywords
frequency
conversion circuit
half cycle
transformer
circuit
Prior art date
Application number
PCT/CN2008/070533
Other languages
French (fr)
Chinese (zh)
Inventor
Dongping Yang
Original Assignee
Proview Technology (Shenzhen) Co., Ltd.
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Filing date
Publication date
Application filed by Proview Technology (Shenzhen) Co., Ltd. filed Critical Proview Technology (Shenzhen) Co., Ltd.
Publication of WO2008128453A1 publication Critical patent/WO2008128453A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2822—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to the field of optoelectronic technology, and in particular to a power supply device and a dimming method.
  • PWM dimming refers to the rated brightness of the lamp when the lamp is turned on. When the lamp is turned off, the lamp is completely extinguished. By adjusting the ratio of the time when the lamp is turned on and the period of each switch, it is also called The air ratio can easily adjust the average brightness of the lamp, that is, the brightness perceived by the human eye. Since the dimming frequency is usually above 150 Hz, plus the factor of persistence of vision, the human eye does not feel the light and dark transition of the lamp, and only the average value of the transformation, that is, the average brightness of the lamp, can be felt.
  • the prior art uses a soft-start method to better reduce the dimming noise of the high-frequency transformer.
  • the operating frequency of the lamp power supply is gradually reduced from the high operating frequency at the start-up to the rated operating frequency to avoid a large impact on the high-frequency transformer; or, in the fixed-frequency widening mode, The turn-on time of the lamp power supply is gradually increased to the rated turn-on time, and the high-frequency transformer can be prevented from being greatly impacted.
  • These two methods can better reduce the dimming noise of the high-frequency transformer, but cannot be completely
  • the fundamental reason for eliminating the dimming noise of high-frequency transformers is that the dynamic balance of circuit parameters cannot be maintained.
  • the switching converter circuit uses a half-bridge circuit as shown in FIG. 1.
  • the potential of the circuit parameter point A in steady state is: El l + v , where E is the circuit input voltage, and Vin in the figure (below)
  • E is the circuit input voltage
  • Vin in the figure (below)
  • E is similar to this
  • ⁇ represents the potential offset of the half-bridge midpoint potential due to circuit parameter imbalance, which is always present during operation.
  • the change of the ⁇ point potential at each start-up is shown in Figure 2. It can be seen that the potential at point A has a stable process from £/2 to £/2 + ⁇ . Therefore, each time the start-up, the high-frequency transformer is also A transition process is required to reach a steady state, so dimming noise is difficult to eliminate.
  • Switching circuit is shown in Figure 3.
  • the potential of the circuit parameter DC-blocking capacitor C is ⁇ at steady state, and the potential at C is 0 when the operation is stopped. Therefore, each time it starts, from the stop state to the steady state, the voltage on C will have a transition process. As shown in Figure 4, this transition process will affect the operation of the high-frequency transformer, so that the high-frequency transformer also needs a The transition process reaches a steady state, so dimming noise is difficult to eliminate.
  • the switch conversion circuit is another half-bridge circuit as shown in Fig. 5. Every time it starts, from the stop state to the steady state, the potential change on the circuit parameter C is as shown in Fig. 6. Therefore, the high-frequency transformer also needs a The transition process reaches a steady state, and the dimming noise is difficult to eliminate.
  • the embodiment of the invention provides a power supply device and a dimming method, which can completely eliminate the dimming noise and realize PWM dimming.
  • embodiments of the present invention provide:
  • a power supply device comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonant capacitor; the control circuit controls a gradual change of an operating frequency of the multi-switch conversion circuit between a first frequency and a second frequency; The output of the multi-switching conversion circuit is connected to the primary side of the transformer, and the resonant capacitor is connected in series between the secondary side of the transformer and the load.
  • a power supply device comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonant capacitor, a resonant inductor; and the control circuit controls a gradual change of an operating frequency of the multi-switching conversion circuit between a first frequency and a second frequency ;
  • the resonant capacitor is connected in series between the output of the multi-switching conversion circuit and the primary side of the transformer; and the resonant inductor is connected in series between the secondary side of the transformer and the load.
  • a power supply device comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonance circuit; the control circuit controls a change frequency of an operating frequency of the multi-switch conversion circuit between a first frequency and a second frequency;
  • the resonant inductor and the resonant capacitor are connected in series to form a resonant circuit, and the resonant circuit is connected in series between an output of the multi-switching conversion circuit and a primary side of the transformer.
  • a method of dimming including:
  • the operating frequency of the control multi-switching conversion circuit changes gradually between the first frequency and the second frequency; the multi-switching conversion circuit drives the transformer to supply power to the lamp.
  • the operating frequency of the multi-switch conversion circuit used in the power supply device of the embodiment of the present invention changes gradually between the first frequency and the second frequency
  • the voltage of the load is increased according to the operating frequency of the multi-switch conversion circuit.
  • the rate changes.
  • the load is a lamp
  • the brightness and darkness of the lamp can be controlled to realize PWM dimming.
  • the PWM dimming mode is realized by changing the operating frequency of the multi-switch conversion circuit, and the lamp power supply does not need to be made.
  • the change of the working and stopping states can maintain the dynamic balance of the circuit parameters, thereby eliminating the dimming noise of the transformer.
  • FIG. 2 is a diagram showing a change in potential of point A in the half bridge circuit provided in FIG. 1 of the prior art
  • FIG. 4 is a diagram showing changes in the full bridge circuit of FIG. 3 of the prior art
  • Figure 5 is a half bridge circuit provided by the prior art
  • FIG. 6 is a diagram showing changes in the half bridge circuit provided in FIG. 5 of the prior art
  • FIG. 7 is a structural diagram of a power supply device according to Embodiment 1 of the present invention.
  • Embodiment 8 is a diagram showing changes in frequency signals outputted by a control circuit in Embodiment 1 of the present invention.
  • FIG. 9 is a diagram showing changes in frequency signals outputted by a control circuit according to Embodiment 1 of the present invention.
  • FIG. 10 is a schematic diagram of a working frequency gradation mode of a multi-switch conversion circuit according to Embodiment 1 of the present invention
  • FIG. 11 is a diagram showing changes of a load voltage according to an operating frequency according to an embodiment of the present invention
  • FIG. 12 is a circuit diagram of a power supply device for a half bridge circuit in a first embodiment of the present invention
  • FIG. 13 is a structural diagram of a power supply device according to Embodiment 2 of the present invention.
  • FIG. 14 is a structural diagram of a power supply device according to Embodiment 3 of the present invention.
  • FIG. 15 is a structural diagram of a power supply device according to Embodiment 4 of the present invention.
  • FIG. 16 is a flowchart of a dimming method according to Embodiment 5 of the present invention.
  • the present invention provides a power supply device including: a control circuit, a multi-switch conversion circuit, a transformer, and a resonance circuit.
  • Embodiment 1 of the present invention a power supply device according to Embodiment 1 of the present invention is provided, wherein:
  • the control circuit 71 outputs a frequency signal to the multi-switch conversion circuit 72 according to the external PWM dimming signal to control the operating frequency of the multi-switch conversion circuit 72.
  • the frequency signal output by the control circuit 71 is gradually changed between the first frequency and the second frequency. Varying, the first frequency and the second frequency are included between the first frequency and the second frequency; the first frequency is a frequency at a rated brightness of the lamp; the second frequency The rate is much higher than the nominal brightness of the lamp.
  • the change is: at the end of a half cycle of a frequency, switching from the positive half cycle of a frequency to the negative half cycle of the next frequency, as shown in FIG. 8, or switching from the negative half cycle of the one frequency to the lower half.
  • the positive half cycle of a frequency as shown in Figure 9.
  • the frequency and the next frequency refer to a frequency that is gradually changed between the first frequency and the second frequency; where ⁇ and ⁇ are the switching points of the frequency.
  • the multi-switching conversion circuit 72 operates at an operating frequency that varies gradually between the first frequency and the second frequency.
  • the manner of changing the operating frequency of the multi-switching conversion circuit 72 can be as shown in FIG. 10, wherein, the first frequency is the second frequency, the working frequency is from time to time, the frequency is from ⁇ to 2 time, and the operation is performed.
  • the frequency will be stable for a period of time on the frequency and frequency ,.
  • the lamp is off during the time period when the mark is OFF, and the lamp is on during the time period when the mark is ON.
  • the output of the multi-switching conversion circuit 72 is connected to the primary side of the transformer.
  • the transformer uses a high-leakage magnetic transformer, and the secondary leakage inductance and the capacitor are connected in series to form a resonant circuit, and the lamp is driven to simulate the load.
  • the voltage of the lamp analog load changes according to the operating frequency of the multi-switch conversion circuit 72. As shown in FIG. 11, when the operating frequency of the multi-switch conversion circuit 72 is / 2 , the voltage of the lamp analog load ? fl is ⁇ , When the lamp simulates the load?
  • the voltage on fl is lower than the voltage of the arc discharge of the lamp, and the lamp is extinguished; when the operating frequency of the multi-switch conversion circuit is /;, the voltage on the analog load of the lamp is, at this time, The voltage on the lamp analog load ⁇ is higher than the voltage of the arc discharge of the lamp, and the lamp is bright; the voltage on the lamp analog load ⁇ changes from the phase to the change of the lamp, and the lamp gradually darkens from bright to bright. Therefore, the output characteristic of the lamp analog load is related to the operating frequency of the multi-switch conversion circuit 72. By changing the operating frequency of the multi-switch conversion circuit 72, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
  • the multi-switch conversion circuit 72 can use a half bridge circuit and a full bridge circuit, and the actual application circuit diagram using the half bridge circuit is as shown in FIG.
  • the functions and connection relationships of the control circuit 71 and the multi-switch conversion circuit 72 are the same as in the first embodiment.
  • the voltage of the multi-switching conversion circuit 72 and the primary side of the transformer are connected in series with the resonant inductor transformer and the analog load of the lamp.
  • the voltage of the analog capacitor is simulated according to the operating frequency of the multi-switch converter circuit. 11 is shown. Therefore, the lamp simulates the load.
  • the output characteristic is related to the operating frequency of the multi-switching conversion circuit. By changing the operating frequency, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
  • a power supply device according to Embodiment 3 of the present invention is provided, wherein the functions and connection relationships of the control circuit 71 and the multi-switch conversion circuit 72 are the same as those in the first embodiment.
  • Resonant inductor and resonant capacitor ⁇ ( ⁇ form a resonance circuit, the resonance circuit connected in series between the transformer primary 72 and multi-switch converting circuit, the transformer secondary side series with the lamp load simulation ⁇ ; lamp voltage in accordance with a simulated load fl?
  • the operating frequency of the multi-switching conversion circuit 72 changes as shown in Fig. 11. Therefore, the output characteristic of the lamp analog load ⁇ is related to the operating frequency of the multi-switching conversion circuit, and by changing the operating frequency, the brightness and darkness of the lamp can be changed. PWM dimming.
  • a power supply device according to Embodiment 4 of the present invention is provided, wherein the functions and connection relationships of the control circuit 71 and the multi-switch conversion circuit 72 are the same as those in the first embodiment.
  • Multi-switch converting circuit between the output of the primary of the transformer 72 is connected in series with the series resonant inductor L r between the transformer and the secondary side resonance capacitor analog lamp load;
  • Lamp lamp voltage load simulation operates according to the multi-switch converting circuit 72
  • the frequency changes as shown in Figure 11. Therefore, the output characteristic of the lamp analog load? fl is related to the operating frequency of the multi-switch conversion circuit. By changing the operating frequency, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
  • the multi-switching conversion circuit in the power supply device of the embodiment of the present invention only changes the operating frequency without a change of the working or stopping state, so that the potential of the half point of the half bridge circuit as shown in FIG. 1 can be made.
  • the voltage in the full-bridge circuit shown in Figure 3 and the half-bridge circuit shown in Figure 5 is constant, that is, the potential at point A in Figure 1 and the hold at £/2 + ⁇ in Figure 5, the hold in Figure 3. At ⁇ , the dynamic balance of the circuit parameters can be maintained, thus eliminating the dimming noise of the transformer.
  • a flowchart of a dimming method according to Embodiment 5 of the present invention mainly includes the following steps:
  • Step 1601 The control circuit controls the operating frequency of the multi-switch conversion circuit to change gradually between the first frequency and the second frequency according to the external PWM dimming signal, and the frequency signal outputted by the control circuit changes as shown in FIG. 8 or FIG.
  • the operation frequency of the multi-switch conversion circuit is changed as shown in FIG. 10;
  • Step 1602 the multi-switching conversion circuit operates at the working frequency, and the driving transformer supplies power to the lamp tube; the multi-switching conversion circuit drives the transformer to supply power to the lamp tube in various ways, for example: the secondary side leakage inductance of the transformer and the resonance formed by the capacitor lamp driver circuitry; or series resonant inductor between the primary output of multi-switch converting circuit ⁇ transformer, the transformer and the secondary side series resonance between the dummy load lamp FL?
  • the vibration capacitor or the resonant inductor ⁇ and the resonant capacitor ( ⁇ constitute a resonant circuit, the transformer primary side and the multi-switching conversion circuit output are connected in series with the resonant circuit, the secondary side of the transformer and the lamp analog load ⁇ are connected in series; or, multi-switching a resonant capacitor connected in series between the transformer secondary and the dummy load R lamp lamp series resonant inductor L r and the output of the transformer between the primary circuit.
  • the above four methods can make the lamp simulate the load?
  • the voltage of fl changes according to the operating frequency of the multi-switch conversion circuit. As shown in Fig. 11, when the operating frequency of the multi-switch conversion circuit is / 2 , the lamp simulates the load. ⁇ The voltage is at this time, the lamp simulates the load? The voltage on fl is lower than the voltage of the arc discharge of the lamp, and the lamp is extinguished; when the operating frequency of the multi-switch conversion circuit is /;, the lamp simulates the load ⁇ When the voltage is at this time, the voltage on the analog load of the lamp is higher than the voltage of the arc discharge of the lamp, the lamp is bright; the lamp simulates the load?
  • the voltage on the fl changes from the phase to the change of the lamp, and the lamp gradually darkens from the light; therefore,
  • the output characteristic of the lamp analog load ⁇ is related to the operating frequency of the multi-switch conversion circuit. By changing the operating frequency, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
  • the operating frequency of the multi-switching conversion circuit used in the embodiment of the present invention is gradually changed between the first frequency and the second frequency, and the multi-switching conversion circuit is used to drive the transformer to supply power to the lamp, and the voltage of the lamp analog load is increased.
  • the operating frequency of the switching converter circuit changes, causing the lamp to change bright and dark, realizing PWM dimming. This way of changing the operating frequency of the multi-switching conversion circuit to realize PWM dimming does not require the multi-switching conversion circuit to stop working.
  • the operating frequency of the multi-switching conversion circuit is gradually switched between the first frequency and the second frequency: the control circuit controls the operating frequency of the multi-switching conversion circuit At the end of a half cycle of a frequency, switching from the positive half cycle of one frequency to the negative half cycle of the next frequency or from the negative half cycle of one frequency to the positive half cycle of the next frequency, can avoid noise generated by the high frequency transformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

A power supply device and a light-adjusting method. The power supply device includes a multi-switch converter circuit (72), a transformer (Tr), a resonance circuit consisted of a resonance capacitor (Cr) and a resonance inductor (Lr), and a switching frequency control circuit (71). Based on a PWM light-adjusting signal, the control circuit (71) controls the operating frequency of the multi-switch converter circuit (72) gradually varying between a first frequency and a second frequency.

Description

一种电源装置及调光方法  Power supply device and dimming method
本申请要求于 2007 年 4 月 19 日提交中国专利局、 申请号为 200710098301.2、 发明名称为 "一种电源装置及调光方法，，的中国专利申请的优 先权， 其全部内容通过引用结合在本申请中。  This application claims priority to Chinese Patent Application No. 200710098301.2, entitled "Power Supply Unit and Dimming Method," filed on April 19, 2007, the entire contents of which are incorporated herein by reference. In the application.
技术领域 Technical field
本发明涉及光电技术领域， 具体涉及一种电源装置及调光方法。  The present invention relates to the field of optoelectronic technology, and in particular to a power supply device and a dimming method.
背景技术 Background technique
脉宽调制 （PWM, Pulse Width Modulation )调光是指灯电源开时灯发出 额定亮度， 灯电源关时灯完全熄灭，通过调整灯电源开通的时间和每次开关的 周期的比值， 也称占空比， 可以方便地调整灯的平均亮度， 即人眼感觉到的亮 度。 由于调光频率通常在 150Hz 以上， 加上视觉暂留的因素， 因此， 人眼感 觉不到灯的亮暗变换， 只能感觉到这个变换的平均值， 即灯的平均亮度。  PWM (Pulse Width Modulation) dimming refers to the rated brightness of the lamp when the lamp is turned on. When the lamp is turned off, the lamp is completely extinguished. By adjusting the ratio of the time when the lamp is turned on and the period of each switch, it is also called The air ratio can easily adjust the average brightness of the lamp, that is, the brightness perceived by the human eye. Since the dimming frequency is usually above 150 Hz, plus the factor of persistence of vision, the human eye does not feel the light and dark transition of the lamp, and only the average value of the transformation, that is, the average brightness of the lamp, can be felt.
现有技术中， 开关变换电路工作在灯管额定亮度时的频率时， 灯管最亮， 开关变换电路停止工作时， 灯管熄灭， 因此， 在调光时， 开关变换电路是在停 止一额定工作频率 /动态平衡一停止之间循环变化， 开关变换电路的每一次启 动都会带来一个冲击， 从而使高频变压器发出调光噪声。  In the prior art, when the switch conversion circuit operates at the rated brightness of the lamp, the lamp is the brightest, and when the switch conversion circuit stops working, the lamp is extinguished. Therefore, during dimming, the switch conversion circuit is stopped at a rated value. When the operating frequency/dynamic balance is cyclically changed between stops, each start of the switching converter circuit brings an impact, so that the high-frequency transformer emits dimming noise.
为了消除高频变压器的调光噪声，现有技术釆用软启动的方式， 可以较好 地降低高频变压器的调光噪声。 例如， 在调频工作模式下， 灯电源的工作频率 从启动时很高的工作频率逐渐降低到额定的工作频率，避免对高频变压器产生 大的冲击； 或者， 在定频调宽工作模式下， 灯电源的开通时间 艮窄的开通时 间逐渐提高到额定的开通时间， 也可以避免对高频变压器产生大的冲击， 这两 种方法能较好地降低高频变压器的调光噪声 ,但是不能彻底消除高频变压器的 调光噪声， 其根本原因在于： 不能维持电路参数的动态平衡。 例如， 开关变换 电路釆用如图 1所示的半桥电路， 稳态时电路参数 A点的电位为： El l + v , 其中， E为电路输入电压，和图中的 Vin—致（以下所提到的 E与此类似 ), Δ 表示半桥中点电位由于电路参数不平衡引起的电位偏移，该偏移在工作中一直 存在。 Α点电位在每次启动时的变化如图 2所示， 可以看出 A点电位有一个 从 £/2变化到 £/2 + Δν的稳定过程， 因而， 每次启动时， 高频变压器也需要一 个过渡过程达到稳定状态， 所以调光噪声很难消除。 开关变换电路釆用如图 3 所示的全桥电路， 电路参数隔直电容 C在稳态时的电位为 Δν , 在停止工作时， C上的电位为 0。 因而， 每次启动的时候， 从停止状态到稳定状态， C上的电 压 会有一个过渡的过程，如图 4所示，这个过渡过程会影响高频变压器的工 作，使高频变压器也需要一个过渡过程达到稳定状态，所以调光噪声很难消除。 开关变换电路如图 5所示的另一种半桥电路，每次启动的时候，从停止状态到 稳定状态， 电路参数 C上的电位变化如图 6所示， 因而， 高频变压器也需要 一个过渡过程达到稳定状态， 调光噪声 4艮难消除。 In order to eliminate the dimming noise of the high-frequency transformer, the prior art uses a soft-start method to better reduce the dimming noise of the high-frequency transformer. For example, in the FM mode, the operating frequency of the lamp power supply is gradually reduced from the high operating frequency at the start-up to the rated operating frequency to avoid a large impact on the high-frequency transformer; or, in the fixed-frequency widening mode, The turn-on time of the lamp power supply is gradually increased to the rated turn-on time, and the high-frequency transformer can be prevented from being greatly impacted. These two methods can better reduce the dimming noise of the high-frequency transformer, but cannot be completely The fundamental reason for eliminating the dimming noise of high-frequency transformers is that the dynamic balance of circuit parameters cannot be maintained. For example, the switching converter circuit uses a half-bridge circuit as shown in FIG. 1. The potential of the circuit parameter point A in steady state is: El l + v , where E is the circuit input voltage, and Vin in the figure (below) The mentioned E is similar to this), Δ represents the potential offset of the half-bridge midpoint potential due to circuit parameter imbalance, which is always present during operation. The change of the 电位 point potential at each start-up is shown in Figure 2. It can be seen that the potential at point A has a stable process from £/2 to £/2 + Δν. Therefore, each time the start-up, the high-frequency transformer is also A transition process is required to reach a steady state, so dimming noise is difficult to eliminate. Switching circuit is shown in Figure 3. In the full-bridge circuit shown, the potential of the circuit parameter DC-blocking capacitor C is Δν at steady state, and the potential at C is 0 when the operation is stopped. Therefore, each time it starts, from the stop state to the steady state, the voltage on C will have a transition process. As shown in Figure 4, this transition process will affect the operation of the high-frequency transformer, so that the high-frequency transformer also needs a The transition process reaches a steady state, so dimming noise is difficult to eliminate. The switch conversion circuit is another half-bridge circuit as shown in Fig. 5. Every time it starts, from the stop state to the steady state, the potential change on the circuit parameter C is as shown in Fig. 6. Therefore, the high-frequency transformer also needs a The transition process reaches a steady state, and the dimming noise is difficult to eliminate.
发明内容 Summary of the invention
本发明实施例提供一种电源装置及调光方法， 能够彻底消除调光噪声， 实 现 PWM调光。  The embodiment of the invention provides a power supply device and a dimming method, which can completely eliminate the dimming noise and realize PWM dimming.
有鉴于此， 本发明的实施例提供：  In view of this, embodiments of the present invention provide:
一种电源装置， 包括： 控制电路， 多开关变换电路， 变压器， 谐振电容； 所述控制电路控制所述多开关变换电路的工作频率在第一频率和第二频率之 间渐变式变化； 所述多开关变换电路的输出接所述变压器的原边， 所述变压器 的副边与负载之间串接所述谐振电容。  A power supply device, comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonant capacitor; the control circuit controls a gradual change of an operating frequency of the multi-switch conversion circuit between a first frequency and a second frequency; The output of the multi-switching conversion circuit is connected to the primary side of the transformer, and the resonant capacitor is connected in series between the secondary side of the transformer and the load.
一种电源装置， 包括： 控制电路， 多开关变换电路， 变压器， 谐振电容， 谐振电感；所述控制电路控制所述多开关变换电路的工作频率在第一频率和第 二频率之间渐变式变化；  A power supply device comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonant capacitor, a resonant inductor; and the control circuit controls a gradual change of an operating frequency of the multi-switching conversion circuit between a first frequency and a second frequency ;
所述多开关变换电路的输出与所述变压器的原边之间串接所述谐振电容； 所述变压器的副边与负载之间串接所述谐振电感。  The resonant capacitor is connected in series between the output of the multi-switching conversion circuit and the primary side of the transformer; and the resonant inductor is connected in series between the secondary side of the transformer and the load.
一种电源装置， 包括： 控制电路， 多开关变换电路， 变压器， 谐振电路； 所述控制电路控制所述多开关变换电路的工作频率在第一频率和第二频 率之间渐变式变化； 所述谐振电感与所述谐振电容串接成谐振电路， 所述谐振 电路串接在所述多开关变换电路的输出和所述变压器的原边之间。  A power supply device comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonance circuit; the control circuit controls a change frequency of an operating frequency of the multi-switch conversion circuit between a first frequency and a second frequency; The resonant inductor and the resonant capacitor are connected in series to form a resonant circuit, and the resonant circuit is connected in series between an output of the multi-switching conversion circuit and a primary side of the transformer.
一种调光方法， 包括：  A method of dimming, including:
控制多开关变换电路的工作频率在第一频率和第二频率之间渐变式变化； 所述多开关变换电路驱动变压器给灯管供电。  The operating frequency of the control multi-switching conversion circuit changes gradually between the first frequency and the second frequency; the multi-switching conversion circuit drives the transformer to supply power to the lamp.
由于本发明实施例的电源装置釆用的多开关变换电路的工作频率在第一 频率和第二频率之间渐变式变化，使负载的电压随着多开关变换电路的工作频 率发生变化， 当负载是灯管时， 可以控制灯管的亮暗， 实现 PWM调光， 釆用 这种通过改变多开关变换电路的工作频率实现 PWM调光的方式，不需要使灯 电源做工作和停止状态变化， 可以保持电路参数的动态平衡， 进而能消除变压 器的调光噪声。 Since the operating frequency of the multi-switch conversion circuit used in the power supply device of the embodiment of the present invention changes gradually between the first frequency and the second frequency, the voltage of the load is increased according to the operating frequency of the multi-switch conversion circuit. The rate changes. When the load is a lamp, the brightness and darkness of the lamp can be controlled to realize PWM dimming. The PWM dimming mode is realized by changing the operating frequency of the multi-switch conversion circuit, and the lamp power supply does not need to be made. The change of the working and stopping states can maintain the dynamic balance of the circuit parameters, thereby eliminating the dimming noise of the transformer.
附图说明 DRAWINGS
图 1为现有技术提供的半桥电路；  1 is a half bridge circuit provided by the prior art;
图 2为现有技术的图 1提供的半桥电路中的 A点电位变化图；  2 is a diagram showing a change in potential of point A in the half bridge circuit provided in FIG. 1 of the prior art;
图 3为现有技术提供的全桥电路；  3 is a full bridge circuit provided by the prior art;
图 4为现有技术的图 3提供的全桥电路中的^变化图；  4 is a diagram showing changes in the full bridge circuit of FIG. 3 of the prior art;
图 5为现有技术提供的半桥电路；  Figure 5 is a half bridge circuit provided by the prior art;
图 6为现有技术的图 5提供的半桥电路中的^变化图；  6 is a diagram showing changes in the half bridge circuit provided in FIG. 5 of the prior art;
图 7为本发明实施例一提供的电源装置结构图；  7 is a structural diagram of a power supply device according to Embodiment 1 of the present invention;
图 8为本发明实施例一中的控制电路输出的频率信号变化图；  8 is a diagram showing changes in frequency signals outputted by a control circuit in Embodiment 1 of the present invention;
图 9为本发明实施例一中的控制电路输出的频率信号变化图；  FIG. 9 is a diagram showing changes in frequency signals outputted by a control circuit according to Embodiment 1 of the present invention; FIG.
图 10为本发明实施例一中的多开关变换电路的工作频率渐变方式图； 图 11为本发明实施例提供的负载电压随工作频率的变化图；  10 is a schematic diagram of a working frequency gradation mode of a multi-switch conversion circuit according to Embodiment 1 of the present invention; FIG. 11 is a diagram showing changes of a load voltage according to an operating frequency according to an embodiment of the present invention;
图 12为本发明实施例一中釆用半桥电路的电源装置电路图；  12 is a circuit diagram of a power supply device for a half bridge circuit in a first embodiment of the present invention;
图 13为本发明实施例二提供的电源装置结构图；  13 is a structural diagram of a power supply device according to Embodiment 2 of the present invention;
图 14为本发明实施例三提供的电源装置结构图；  14 is a structural diagram of a power supply device according to Embodiment 3 of the present invention;
图 15为本发明实施例四提供的电源装置结构图；  15 is a structural diagram of a power supply device according to Embodiment 4 of the present invention;
图 16为本发明实施例五提供的调光方法流程图。  FIG. 16 is a flowchart of a dimming method according to Embodiment 5 of the present invention.
具体实施方式 detailed description
本发明提供一种电源装置， 该电源包括： 控制电路， 多开关变换电路， 变 压器， 谐振电路。  The present invention provides a power supply device including: a control circuit, a multi-switch conversion circuit, a transformer, and a resonance circuit.
参阅图 7 , 是本发明实施例一提供的一种电源装置， 其中：  Referring to FIG. 7, a power supply device according to Embodiment 1 of the present invention is provided, wherein:
控制电路 71根据外部 PWM调光信号输出频率信号到多开关变换电路 72， 控制多开关变换电路 72的工作频率； 其中，控制电路 71输出的频率信号在第 一频率和第二频率之间渐变式变化，所述第一频率和第二频率之间包括所述第 一频率和所述第二频率； 所述第一频率为灯管额定亮度时的频率； 所述第二频 率为远高于灯管额定亮度时的频率。其变化方式是：在一频率的半周期结束时， 从一频率的正半周切换到下一频率的负半周， 如图 8所示， 或， 从所述一频率 的负半周切换到所述下一频率的正半周， 如图 9所示。 其中， 所述一频率和所 述下一频率是指在第一频率和第二频率之间逐渐依次变换的频率； 图示中的^ 和^是频率的切换点。 The control circuit 71 outputs a frequency signal to the multi-switch conversion circuit 72 according to the external PWM dimming signal to control the operating frequency of the multi-switch conversion circuit 72. The frequency signal output by the control circuit 71 is gradually changed between the first frequency and the second frequency. Varying, the first frequency and the second frequency are included between the first frequency and the second frequency; the first frequency is a frequency at a rated brightness of the lamp; the second frequency The rate is much higher than the nominal brightness of the lamp. The change is: at the end of a half cycle of a frequency, switching from the positive half cycle of a frequency to the negative half cycle of the next frequency, as shown in FIG. 8, or switching from the negative half cycle of the one frequency to the lower half. The positive half cycle of a frequency, as shown in Figure 9. The frequency and the next frequency refer to a frequency that is gradually changed between the first frequency and the second frequency; where ^ and ^ are the switching points of the frequency.
多开关变换电路 72以在第一频率和第二频率之间渐变式变化的工作频率 工作。 多开关变换电路 72的工作频率渐变式切换的方式可以如图 10所示， 其 中， 是第一频率， 是第二频率，工作频率由 到 Λ需要 时间，频率由 Λ 到 需要 2时间， 且工作频率会在频率 和频率 Λ上各稳定一段时间， 图示 中在标识 OFF的时间段内灯管熄灭， 在标识 ON的时间段内灯管亮。  The multi-switching conversion circuit 72 operates at an operating frequency that varies gradually between the first frequency and the second frequency. The manner of changing the operating frequency of the multi-switching conversion circuit 72 can be as shown in FIG. 10, wherein, the first frequency is the second frequency, the working frequency is from time to time, the frequency is from Λ to 2 time, and the operation is performed. The frequency will be stable for a period of time on the frequency and frequency ,. In the illustration, the lamp is off during the time period when the mark is OFF, and the lamp is on during the time period when the mark is ON.
多开关变换电路 72的输出接变压器的原边， 该实施例中的变压器釆用高 漏磁变压器， 副边漏感与电容 串接构成谐振电路， 驱动灯管模拟负载 ^^。 灯管模拟负载 的电压根据多开关变换电路 72的工作频率发生变化， 如图 11所示， 当多开关变换电路 72的工作频率为 /2时， 灯管模拟负载 ? fl 的电压 为^ , 此时， 灯管模拟负载 ? fl 上的电压低于灯管弧光放电的电压， 灯管熄 灭； 当多开关变换电路的工作频率为/；时， 灯管模拟负载 ^ 上的电压为 , 此时， 灯管模拟负载 ^ 上的电压高于灯管弧光放电的电压， 灯管亮； 灯管模 拟负载^^上的电压从 到^的变化阶段， 灯从亮逐渐变暗。 因此， 灯管模 拟负载^^的输出特性与多开关变换电路 72的工作频率有关， 通过改变多开 关变换电路 72的工作频率， 可以改变灯的亮暗， 实现了 PWM调光。 The output of the multi-switching conversion circuit 72 is connected to the primary side of the transformer. In the embodiment, the transformer uses a high-leakage magnetic transformer, and the secondary leakage inductance and the capacitor are connected in series to form a resonant circuit, and the lamp is driven to simulate the load. The voltage of the lamp analog load changes according to the operating frequency of the multi-switch conversion circuit 72. As shown in FIG. 11, when the operating frequency of the multi-switch conversion circuit 72 is / 2 , the voltage of the lamp analog load ? fl is ^, When the lamp simulates the load? The voltage on fl is lower than the voltage of the arc discharge of the lamp, and the lamp is extinguished; when the operating frequency of the multi-switch conversion circuit is /;, the voltage on the analog load of the lamp is, at this time, The voltage on the lamp analog load ^ is higher than the voltage of the arc discharge of the lamp, and the lamp is bright; the voltage on the lamp analog load ^^ changes from the phase to the change of the lamp, and the lamp gradually darkens from bright to bright. Therefore, the output characteristic of the lamp analog load is related to the operating frequency of the multi-switch conversion circuit 72. By changing the operating frequency of the multi-switch conversion circuit 72, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
其中， 多开关变换电路 72可以使用半桥电路和全桥电路， 使用半桥电路 的实际应用电路图如图 12所示。  Wherein, the multi-switch conversion circuit 72 can use a half bridge circuit and a full bridge circuit, and the actual application circuit diagram using the half bridge circuit is as shown in FIG.
参阅图 13 , 是本发明实施例二提供的一种电源装置， 其中，  Referring to FIG. 13, a power supply device according to Embodiment 2 of the present invention, wherein
控制电路 71和多开关变换电路 72的功能和连接关系与实施例一相同。 多开关变换电路 72的输出与变压器原边之间串接谐振电感 变压器副 边与灯管模拟负载 之间串接谐振电容 灯管模拟负载 的电压根据多 开关变换电路的工作频率发生变化，如图 11所示。 因此，灯管模拟负载 。 的 输出特性与多开关变换电路的工作频率有关，通过改变工作频率， 可以改变灯 的亮暗， 实现了 PWM调光。 参阅图 14, 是本发明实施例三提供的一种电源装置， 其中， 控制电路 71 和多开关变换电路 72的功能和连接关系与实施例一相同。 The functions and connection relationships of the control circuit 71 and the multi-switch conversion circuit 72 are the same as in the first embodiment. The voltage of the multi-switching conversion circuit 72 and the primary side of the transformer are connected in series with the resonant inductor transformer and the analog load of the lamp. The voltage of the analog capacitor is simulated according to the operating frequency of the multi-switch converter circuit. 11 is shown. Therefore, the lamp simulates the load. The output characteristic is related to the operating frequency of the multi-switching conversion circuit. By changing the operating frequency, the brightness and darkness of the lamp can be changed, and PWM dimming is realized. Referring to FIG. 14, a power supply device according to Embodiment 3 of the present invention is provided, wherein the functions and connection relationships of the control circuit 71 and the multi-switch conversion circuit 72 are the same as those in the first embodiment.
谐振电感 ^和谐振电容 (^构成谐振电路， 变压器原边与多开关变换电路 72之间串接谐振电路， 变压器的副边与灯管模拟负载 ^ 串接； 灯管模拟负 载 ? fl 的电压根据多开关变换电路 72的工作频率发生变化， 如图 11所示。 因 此， 灯管模拟负载 ^ 的输出特性与多开关变换电路的工作频率有关，通过改 变工作频率， 可以改变灯的亮暗， 实现了 PWM调光。 Resonant inductor and resonant capacitor ^ (^ form a resonance circuit, the resonance circuit connected in series between the transformer primary 72 and multi-switch converting circuit, the transformer secondary side series with the lamp load simulation ^; lamp voltage in accordance with a simulated load fl? The operating frequency of the multi-switching conversion circuit 72 changes as shown in Fig. 11. Therefore, the output characteristic of the lamp analog load ^ is related to the operating frequency of the multi-switching conversion circuit, and by changing the operating frequency, the brightness and darkness of the lamp can be changed. PWM dimming.
参阅图 15 , 是本发明实施例四提供的一种电源装置， 其中， 控制电路 71 和多开关变换电路 72的功能和连接关系与实施例一相同。  Referring to FIG. 15, a power supply device according to Embodiment 4 of the present invention is provided, wherein the functions and connection relationships of the control circuit 71 and the multi-switch conversion circuit 72 are the same as those in the first embodiment.
多开关变换电路 72的输出与变压器原边之间串接谐振电容 变压器副 边与灯管模拟负载 之间串接谐振电感 Lr；灯管模拟负载 RLamp的电压根据多 开关变换电路 72的工作频率发生变化，如图 11所示。因此，灯管模拟负载 ? fl 的输出特性与多开关变换电路的工作频率有关，通过改变工作频率， 可以改变 灯的亮暗， 实现了 PWM调光。 Multi-switch converting circuit between the output of the primary of the transformer 72 is connected in series with the series resonant inductor L r between the transformer and the secondary side resonance capacitor analog lamp load; R Lamp lamp voltage load simulation operates according to the multi-switch converting circuit 72 The frequency changes as shown in Figure 11. Therefore, the output characteristic of the lamp analog load? fl is related to the operating frequency of the multi-switch conversion circuit. By changing the operating frequency, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
由上述各实施例可见，本发明实施例的电源装置中的多开关变换电路只是 工作频率变化， 而没有工作或停止状态的变化，从而可以使如图 1所示的半桥 电路的 A点电位、 图 3所示的全桥电路和图 5所示的半桥电路中的 电压不 变，即图 1中的 A点电位和图 5中的 保持在 £/2 + Δν ,图 3中的 保持在 Δν , 能够维持电路参数的动态平衡， 因而可以消除变压器的调光噪声。  It can be seen from the above embodiments that the multi-switching conversion circuit in the power supply device of the embodiment of the present invention only changes the operating frequency without a change of the working or stopping state, so that the potential of the half point of the half bridge circuit as shown in FIG. 1 can be made. The voltage in the full-bridge circuit shown in Figure 3 and the half-bridge circuit shown in Figure 5 is constant, that is, the potential at point A in Figure 1 and the hold at £/2 + Δν in Figure 5, the hold in Figure 3. At Δν, the dynamic balance of the circuit parameters can be maintained, thus eliminating the dimming noise of the transformer.
参阅图 16, 是本发明实施例五提供的一种调光方法的流程图， 主要包括 以下步骤：  Referring to FIG. 16, a flowchart of a dimming method according to Embodiment 5 of the present invention mainly includes the following steps:
步骤 1601、 控制电路根据外部 PWM调光信号， 控制多开关变换电路的 工作频率在第一频率和第二频率之间渐变式变化，控制电路输出的频率信号的 变化方式如图 8或图 9所示， 多开关变换电路的工作频率变化方式如图 10所 示；  Step 1601: The control circuit controls the operating frequency of the multi-switch conversion circuit to change gradually between the first frequency and the second frequency according to the external PWM dimming signal, and the frequency signal outputted by the control circuit changes as shown in FIG. 8 or FIG. The operation frequency of the multi-switch conversion circuit is changed as shown in FIG. 10;
步骤 1602、 多开关变换电路以该工作频率工作， 驱动变压器给灯管供电； 多开关变换电路驱动变压器给灯管供电的方式可以有多种， 比如： 变压器 的副边漏感和电容构成的谐振电路驱动灯管； 或者， 多开关变换电路的输出与 变压器原边之间串接谐振电感 ^，变压器副边与灯管模拟负载 ? fl 之间串接谐 振电容 或者， 谐振电感 ^和谐振电容 (^构成谐振电路， 变压器原边与多 开关变换电路输出之间串接谐振电路， 变压器的副边与灯管模拟负载 ^ 串 接； 或者， 多开关变换电路的输出与变压器原边之间串接谐振电容 变压器 副边与灯管模拟负载 RLamp之间串接谐振电感 Lr。 Step 1602, the multi-switching conversion circuit operates at the working frequency, and the driving transformer supplies power to the lamp tube; the multi-switching conversion circuit drives the transformer to supply power to the lamp tube in various ways, for example: the secondary side leakage inductance of the transformer and the resonance formed by the capacitor lamp driver circuitry; or series resonant inductor between the primary output of multi-switch converting circuit ^ transformer, the transformer and the secondary side series resonance between the dummy load lamp FL? The vibration capacitor or the resonant inductor ^ and the resonant capacitor (^ constitute a resonant circuit, the transformer primary side and the multi-switching conversion circuit output are connected in series with the resonant circuit, the secondary side of the transformer and the lamp analog load ^ are connected in series; or, multi-switching a resonant capacitor connected in series between the transformer secondary and the dummy load R lamp lamp series resonant inductor L r and the output of the transformer between the primary circuit.
以上这四种方式都可以使灯管模拟负载 ? fl 的电压根据多开关变换电路 的工作频率发生变化， 如图 11所示， 当多开关变换电路的工作频率为/ 2时， 灯管模拟负载 ^ 的电压为 此时， 灯管模拟负载 ? fl 上的电压低于灯管 弧光放电的电压， 灯管熄灭； 当多开关变换电路的工作频率为/；时， 灯管模拟 负载^ ^上的电压为 此时， 灯管模拟负载 上的电压高于灯管弧光放 电的电压， 灯管亮； 灯管模拟负载 ? fl 上的电压从 到^的变化阶段， 灯从 亮逐渐变暗； 因此， 灯管模拟负载 ^ 的输出特性与多开关变换电路的工作频 率有关， 通过改变工作频率， 可以改变灯的亮暗， 实现了 PWM调光。 The above four methods can make the lamp simulate the load? The voltage of fl changes according to the operating frequency of the multi-switch conversion circuit. As shown in Fig. 11, when the operating frequency of the multi-switch conversion circuit is / 2 , the lamp simulates the load. ^ The voltage is at this time, the lamp simulates the load? The voltage on fl is lower than the voltage of the arc discharge of the lamp, and the lamp is extinguished; when the operating frequency of the multi-switch conversion circuit is /;, the lamp simulates the load ^^ When the voltage is at this time, the voltage on the analog load of the lamp is higher than the voltage of the arc discharge of the lamp, the lamp is bright; the lamp simulates the load? The voltage on the fl changes from the phase to the change of the lamp, and the lamp gradually darkens from the light; therefore, The output characteristic of the lamp analog load ^ is related to the operating frequency of the multi-switch conversion circuit. By changing the operating frequency, the brightness and darkness of the lamp can be changed, and PWM dimming is realized.
本发明实施例釆用的多开关变换电路的工作频率在第一频率和第二频率 之间渐变式切换，使用该多开关变换电路驱动变压器给灯管供电， 灯管模拟负 载的电压随着多开关变换电路的工作频率发生变化，使灯管发生亮暗变化， 实 现 PWM调光， 这种通过改变多开关变换电路的工作频率实现 PWM调光的方 式， 不需要多开关变换电路停止工作， 可以保持电路参数的动态平衡， 因此能 消除变压器的调光噪声；多开关变换电路的工作频率在第一频率和第二频率之 间渐变式切换的方式是：控制电路控制多开关变换电路的工作频率在一频率的 半周期结束时，从一频率的正半周切换到下一频率的负半周或从一频率的负半 周切换到下一频率的正半周， 这样可以避免高频变压器产生噪声。  The operating frequency of the multi-switching conversion circuit used in the embodiment of the present invention is gradually changed between the first frequency and the second frequency, and the multi-switching conversion circuit is used to drive the transformer to supply power to the lamp, and the voltage of the lamp analog load is increased. The operating frequency of the switching converter circuit changes, causing the lamp to change bright and dark, realizing PWM dimming. This way of changing the operating frequency of the multi-switching conversion circuit to realize PWM dimming does not require the multi-switching conversion circuit to stop working. Maintaining the dynamic balance of the circuit parameters, thus eliminating the dimming noise of the transformer; the operating frequency of the multi-switching conversion circuit is gradually switched between the first frequency and the second frequency: the control circuit controls the operating frequency of the multi-switching conversion circuit At the end of a half cycle of a frequency, switching from the positive half cycle of one frequency to the negative half cycle of the next frequency or from the negative half cycle of one frequency to the positive half cycle of the next frequency, can avoid noise generated by the high frequency transformer.
以上对本发明所提供的一种消除 PWM调光噪音的电源及调光方法进行 以上实施例的说明只是用于帮助理解本发明的方法及其核心思想； 同时，对于 本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均 会有改变之处， 综上所述， 本说明书内容不应理解为对本发明的限制。  The above description of the power supply and dimming method for eliminating PWM dimming noise provided by the present invention is only for helping to understand the method of the present invention and its core idea; meanwhile, for those skilled in the art, based on The present invention is not limited by the scope of the present invention.

Claims

权 利 要 求 Rights request
1、 一种电源装置， 其特征在于， 包括： 控制电路， 多开关变换电路， 变 压器，谐振电容； 所述控制电路控制所述多开关变换电路的工作频率在第一频 率和第二频率之间渐变式变化；所述多开关变换电路的输出接所述变压器的原 边， 所述变压器的副边与负载之间串接所述谐振电容。  What is claimed is: 1. A power supply device, comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonant capacitor; wherein the control circuit controls an operating frequency of the multi-switch conversion circuit between a first frequency and a second frequency a gradual change; the output of the multi-switch conversion circuit is connected to the primary side of the transformer, and the resonant capacitor is connected in series between the secondary side of the transformer and the load.
2、 根据权利要求 1所述的电源装置， 其特征在于：  2. The power supply device according to claim 1, wherein:
所述控制电路控制所述多开关变换电路的工作频率在一频率的半周期结 束时，从所述一频率的正半周切换到下一频率的负半周或从所述一频率的负半 周切换到所述下一频率的正半周；所述一频率在所述第一频率和所述第二频率 之间。  The control circuit controls the operating frequency of the multi-switching conversion circuit to switch from the positive half cycle of the one frequency to the negative half cycle of the next frequency or from the negative half cycle of the one frequency to the end of the half cycle of the frequency a positive half cycle of the next frequency; the frequency being between the first frequency and the second frequency.
3、 根据权利要求 1或 2所述的电源装置， 其特征在于：  3. The power supply device according to claim 1 or 2, characterized in that:
所述变压器的副边漏感与所述谐振电容串接成谐振电路， 驱动所述负载。 The secondary side leakage inductance of the transformer and the resonant capacitor are connected in series to form a resonant circuit to drive the load.
4、 根据权利要求 1或 2所述的电源， 其特征在于： 4. The power supply according to claim 1 or 2, characterized in that:
所述多开关变换电路的输出与所述变压器的原边之间串接谐振电感。  A resonant inductor is connected in series between the output of the multi-switch conversion circuit and the primary side of the transformer.
5、 一种电源装置， 其特征在于， 包括： 控制电路， 多开关变换电路， 变 压器， 谐振电容， 谐振电感； 5. A power supply device, comprising: a control circuit, a multi-switch conversion circuit, a transformer, a resonant capacitor, and a resonant inductor;
所述控制电路控制所述多开关变换电路的工作频率在第一频率和第二频 率之间渐变式变化；所述多开关变换电路的输出与所述变压器的原边之间串接 所述谐振电容； 所述变压器的副边与负载之间串接所述谐振电感。  The control circuit controls the operating frequency of the multi-switching conversion circuit to change gradually between the first frequency and the second frequency; the output of the multi-switching conversion circuit is connected in series with the primary side of the transformer Capacitor; the resonant inductor is connected in series between the secondary side of the transformer and the load.
6、 根据权利要求 5所述的电源装置， 其特征在于：  6. The power supply apparatus according to claim 5, wherein:
所述控制电路控制所述多开关变换电路的工作频率在一频率的半周期结 束时，从所述一频率的正半周切换到下一频率的负半周或从所述一频率的负半 周切换到所述下一频率的正半周；所述一频率在所述第一频率和所述第二频率 之间。  The control circuit controls the operating frequency of the multi-switching conversion circuit to switch from the positive half cycle of the one frequency to the negative half cycle of the next frequency or from the negative half cycle of the one frequency to the end of the half cycle of the frequency a positive half cycle of the next frequency; the frequency being between the first frequency and the second frequency.
7、 一种电源装置， 其特征在于， 包括： 控制电路， 多开关变换电路， 变 压器， 谐振电路；  7. A power supply device, comprising: a control circuit, a multi-switch conversion circuit, a transformer, and a resonance circuit;
所述控制电路控制所述多开关变换电路的工作频率在第一频率和第二频 率之间渐变式变化； 所述谐振电感与所述谐振电容串接成谐振电路， 所述谐振 电路串接在所述多开关变换电路的输出和所述变压器的原边之间。 The control circuit controls the operating frequency of the multi-switching conversion circuit to change gradually between the first frequency and the second frequency; the resonant inductor and the resonant capacitor are connected in series to form a resonant circuit, the resonance A circuit is connected in series between the output of the multi-switch conversion circuit and the primary side of the transformer.
8、 根据权利要求 7所述的电源装置， 其特征在于：  8. The power supply apparatus according to claim 7, wherein:
所述控制电路控制所述多开关变换电路的工作频率在一频率的半周期结 束时，从所述一频率的正半周切换到下一频率的负半周或从所述一频率的负半 周切换到所述下一频率的正半周；所述一频率在所述第一频率和所述第二频率 之间。  The control circuit controls the operating frequency of the multi-switching conversion circuit to switch from the positive half cycle of the one frequency to the negative half cycle of the next frequency or from the negative half cycle of the one frequency to the end of the half cycle of the frequency a positive half cycle of the next frequency; the frequency being between the first frequency and the second frequency.
9、 一种调光方法， 其特征在于， 包括：  9. A method of dimming, characterized in that it comprises:
控制多开关变换电路的工作频率在第一频率和第二频率之间渐变式变化； 所述多开关变换电路驱动变压器给灯管供电。  The operating frequency of the control multi-switching conversion circuit changes gradually between the first frequency and the second frequency; the multi-switching conversion circuit drives the transformer to supply power to the lamp.
10、 根据权利要求 9所述的方法， 其特征在于：  10. The method of claim 9 wherein:
所述控制多开关变换电路的工作频率在第一频率和第二频率之间渐变式 变化包括：  The gradual change of the operating frequency of the control multi-switching conversion circuit between the first frequency and the second frequency includes:
控制所述电路控制多开关变换电路的工作频率在一频率的半周期结束时， 从所述一频率的正半周切换到下一频率的负半周或从所述一频率的负半周切 换到所述下一频率的正半周； 所述一频率在所述第一频率和所述第二频率之 间。  Controlling the operating frequency of the circuit-controlled multi-switching conversion circuit from the positive half cycle of the one frequency to the negative half cycle of the next frequency or from the negative half cycle of the one frequency to the end of the half cycle of the frequency a positive half cycle of the next frequency; the one frequency being between the first frequency and the second frequency.
PCT/CN2008/070533 2007-04-19 2008-03-19 Power supply device and light-adjusting method WO2008128453A1 (en)

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