WO2009124433A1 - 定功率限制器及照明灯具 - Google Patents
定功率限制器及照明灯具 Download PDFInfo
- Publication number
- WO2009124433A1 WO2009124433A1 PCT/CN2008/070798 CN2008070798W WO2009124433A1 WO 2009124433 A1 WO2009124433 A1 WO 2009124433A1 CN 2008070798 W CN2008070798 W CN 2008070798W WO 2009124433 A1 WO2009124433 A1 WO 2009124433A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- load
- power
- power supply
- relay
- Prior art date
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Classifications
-
- 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
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
- H05B39/041—Controlling the light-intensity of the source
-
- 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 an energy saving device, and more particularly to a constant power limiter and a lamp mounted with the constant power limiter. Background technique
- the technical problem to be solved by the present invention is to provide a constant power limiter for limiting the load power of a powered device or an electric appliance within a prescribed range.
- Another technical problem to be solved by the present invention is to provide a lighting fixture in which a constant power limiter is installed.
- the control circuit therein automatically adjusts to control the power of the bulb in the setting. In the range.
- the technical solution of the present invention to solve the above technical problem is to provide a constant power limiter, comprising a control circuit and a power supply circuit thereof, the control circuit comprising:
- a voltage detecting circuit for detecting a power supply voltage
- a current detecting circuit for detecting a load current
- a zero-crossing detection circuit for detecting an AC zero-crossing point
- a micro control unit that receives the voltage detection circuit, the current detection circuit, and the zero-cross detection circuit And outputting a control signal to the load driving circuit to control the power of the alternating current supplied to the load.
- a bypass circuit connected to the output port of the micro control unit for bypassing AC power directly to the load when the control circuit fails is further included.
- the load driving circuit includes a thyristor connected in series in a load power supply line and whose control electrode is connected to an output port of the micro control unit, wherein the control is supplied to the load
- the AC power includes controlling the conduction angle of the thyristor.
- the bypass circuit includes a relay and a switch control circuit thereof, wherein the movable contact of the relay and one of the static contacts are serially connected in the load power supply line,
- the switch circuit receives the control signal output by the micro control unit and controls the pull-in and release of the relay.
- the normally closed contact of the relay is connected to the phase line of the alternating current input end, and the movable contact is connected to the power supply input end of the load.
- the power supply circuit uses an RC step-down circuit, and the power circuit has two sets of loads: a relay and a Vcc, and the power supply of the relay and Vcc are in a series relationship.
- a lighting fixture comprising a bulb and a constant power limiter connected to the bulb power supply line, the constant power limiter comprising a control circuit and a power supply circuit thereof, the control circuit comprising:
- a voltage detecting circuit for detecting a power supply voltage
- a current detecting circuit for detecting a load current
- a zero-crossing detection circuit for detecting an AC zero-crossing point
- a micro control unit receives an output signal of the voltage detecting circuit, the current detecting circuit, and the zero crossing detecting circuit, and outputs a control signal to the load driving circuit to control the power of the alternating current supplied to the bulb.
- a bypass circuit connected to the micro control unit output port for directly bypassing the alternating current to the load when the control circuit fails is further included.
- the load driving circuit includes a series connected to a load power supply line And a thyristor whose gate is connected to an output port of the micro control unit, wherein the controlling the AC power supplied to the load includes controlling a conduction angle of the thyristor.
- the bypass circuit includes a relay and a switch control circuit thereof; wherein the movable contact of the relay and one of the static contacts are serially connected in the load power supply line, the switch circuit Receiving a control signal output by the micro control unit and controlling the pull-in and release of the relay.
- the invention has the beneficial effects that the load power of the electric equipment or the electric appliance can be limited to a preset range, the electric energy can be effectively saved, and the grid overload and the waste of energy can be avoided.
- the design of the bypass circuit is such that when the power limiter fails, the electrical equipment or the electrical appliance can be supplied with power as usual, without affecting the normal operation of the electrical equipment or the electrical appliance.
- 1 is a block diagram showing the composition of a constant power limiter of the present invention
- FIG. 2 is a circuit schematic diagram of a constant power limiter according to an embodiment of the invention.
- 3A is a schematic diagram of a power supply circuit in the constant power limiter shown in FIG. 2;
- FIG. 3B is a schematic diagram of the current flow direction of the power supply circuit shown in FIG. 3A during the negative half cycle of the power supply
- FIG. 3C is a schematic diagram of the current flow direction of the power supply circuit shown in FIG. 3A when the relay is not attracted by the negative half cycle of the power supply;
- 3D is a schematic diagram of current flow direction of the power supply circuit shown in FIG. 3A during the positive half cycle of the power supply;
- 4A is a schematic diagram of a voltage detecting circuit in the constant power limiter shown in FIG. 2;
- FIG. 4B is a schematic diagram of a voltage detecting circuit in an embodiment of a constant power limiter according to the present invention
- FIG. 5A is a schematic diagram of a current detecting circuit in the constant power limiter shown in FIG.
- FIG. 5B is a schematic diagram of a current detecting circuit in an embodiment of a constant power limiter according to the present invention
- FIG. 6A is a schematic diagram of a zero-crossing detecting circuit in the constant power limiter shown in FIG.
- FIG. 6B is a schematic diagram of a zero-crossing detection circuit in an embodiment of a constant power limiter according to the present invention
- FIG. 7 is a schematic diagram of a relay driving circuit in the constant power limiter shown in FIG.
- FIG. 8A is a schematic diagram of a thyristor driving circuit in the constant power limiter shown in FIG. 2;
- Figure 8B is a schematic diagram of a thyristor drive circuit in accordance with an embodiment of a power limiter of the present invention. detailed description
- a constant power limiter includes a control circuit and a power supply circuit that supplies power to the control circuit.
- the control circuit includes: a voltage detection circuit for detecting a power supply voltage, a current detection circuit for detecting a load current, a zero-cross detection circuit for detecting an AC zero-crossing point, a load drive circuit, and a micro control unit (MCU), The output signals of the voltage detecting circuit, the current detecting circuit and the zero-crossing detecting circuit are received, and a control signal is outputted to the load driving circuit to control the power of the alternating current supplied to the load.
- MCU micro control unit
- the constant power limiter of the present invention further includes a bypass circuit coupled to the micro control unit output port for bypassing the alternating current directly to the load when the control circuit fails.
- a bypass circuit coupled to the micro control unit output port for bypassing the alternating current directly to the load when the control circuit fails.
- the bypass circuit includes a relay RY1 and its switch control circuit including transistors TR1 and TR2.
- the load drive circuit includes a thyristor connected in series in the load supply line with its control terminal connected to the output port of the micro control unit U1.
- the working principle is that the micro control unit (MCU) calculates the power of the load by detecting the power supply voltage and the load current, and then controls the power of the load by adjusting the conduction angle of the thyristor to achieve the power limitation. .
- the constant power limiter of the present invention is designed with a relay as a bypass circuit, using a normally closed contact of the relay. Under normal circumstances, the relay is closed, that is, the normally closed contact is open, The bypass circuit does not work. When the controller is not working properly, the relay is released, the normally closed contact is closed, and the load current is completed through the normally closed contact to ensure normal power supply.
- the power supply circuit the voltage detecting circuit, the current detecting circuit, the zero-crossing detecting circuit, the relay driving circuit, and the thyristor driving circuit in the embodiment shown in FIG. 1 will be described separately.
- FIG. 3A is a schematic diagram of a power supply circuit in the constant power limiter shown in FIG. 2.
- the power supply uses the RC step-down circuit.
- the power supply circuit there are two sets of loads in the circuit: the relay and Vcc.
- the power supply of the relay and Vcc are in series, which has the advantage of reducing the step-down capacitance. Capacity. Since the RC step-down circuit is a constant current source, when some or all of the load is not working, the current will flow away through the Zener tube, so the larger the capacitance, the greater the static power consumption.
- the transistor TR1 When the relay needs to be closed, the transistor TR1 is turned on, and the current flows through the coil of the relay RY1. When the relay does not need to be pulled, the transistor TR1 is turned off, no current flows in the coil of the relay RY1, and the current passes through the ZD1 Zener diode. Form a loop.
- FIG. 3B is a schematic diagram showing the current flow direction of the power supply circuit shown in FIG. 3A during the negative half cycle of the power supply
- FIG. 3C is a schematic diagram showing the current flow when the power supply circuit of the power supply circuit does not pick up the negative half cycle of the power supply
- FIG. 3D FIG. The current flow direction is schematic when the power supply is halfway.
- 4A is a schematic diagram of a voltage detecting circuit in the constant power limiter shown in FIG. 2. Since the RC step-down circuit is non-isolated, the voltage signal can be directly sent from the AC power to the A/D port of the MCU, and the MCU can determine the mains voltage value according to the amplitude of the signal. Diode D5 is used for clamping to ensure that the MCU A/D port signal is within safe limits and will not damage the MCU.
- FIG. 5A is a schematic diagram of a current detecting circuit in the constant power limiter shown in FIG. 2.
- J 1 , J2, J 3 are constantan wire, and the resistance of the constantan wire can be selected by changing the length and diameter. After the thyristor SCR1 is turned on, the AC current reaches the other end of the AC power source through the bulb, the thyristor, J l, J2, and J 3 .
- the constantan wire is connected in series in the load supply line, and its own resistance can play a role of voltage division in the circuit. The voltage drop on the constantan wire changes with the change of current.
- the voltage signal with the change of the mains frequency is capacitively coupled by C16 and sent to the A/D port of the MCU for detection.
- the MCU can determine the current flowing through the load based on the amplitude of the signal.
- the function of resistors R26 and R27 is to stabilize the reference point of the signal to which C16 is coupled.
- Fig. 6A is a schematic diagram of a zero crossing detecting circuit in the constant power limiter shown in Fig. 2. ⁇ Use resistor buck, triode shaping zero-crossing detection circuit.
- Figure 7 is a schematic diagram of the relay drive circuit in the constant power limiter shown in Figure 2.
- the I/O port of the control terminal has a pulse signal output.
- the transistor TR2 is turned on during the negative half cycle of the pulse, and the current is emitted from the TR2.
- the pole flows through the collector, charges the capacitor C2 through the resistor R20, and supplies power to the base of the TR1 through R12, so that the transistor TR1 is turned on, the current of the coil of the relay RY1 flows, the relay pulls in, and the C11 is charged at the same time.
- capacitor C14 is discharged through the D1 diode and transistor TR2 is turned off.
- Capacitor C2 supplies power to the base of the TR1 transistor through resistor R12, maintaining TR1 conduction and relay pull-in.
- Resistor R2 is a pull-up resistor that ensures that the base of transistor TR2 is in a high state when there is no control signal, that is, the transistor is turned off.
- the pull-in relay When the pull-in relay is not required, there is no pulse signal output at the control end, and the transistors TR2 and TR1 are turned off. During normal use, the MCU will send a signal to pull the relay. When the MCU fails, the signal will disappear and the relay will automatically pop open.
- FIG. 8A is a schematic diagram of a thyristor driving circuit in the constant power limiter shown in FIG. 2.
- FIG. 8A the I/O port of the MCU directly drives the thyristor.
- the I/O port When the thyristor is not triggered, the I/O port is high, and when the thyristor needs to be triggered, the I/O port outputs a low-level pulse.
- the MCU calculates the voltage signal and the current signal, and then adjusts the conduction time of the thyristor to achieve the purpose of load power control.
- FIG. 4B is a schematic diagram of a voltage sensing circuit in an embodiment of a power limiter in accordance with the present invention. Its working principle: R3, R14, R24 form a voltage dividing circuit, when the positive half cycle of the power supply, the diode D6 is positive On, CI charging, the voltage on CI changes with the change of the power supply voltage, so the MCU can directly read the voltage value across C1 to judge the power supply voltage.
- R25 acts as a discharge resistor for capacitor C1.
- FIG. 5B is a schematic diagram of a current sensing circuit in an embodiment of a power limiter in accordance with the present invention.
- TR1 is a current transformer.
- the load current flows through the primary of TR1. It generates an induced electromotive force at the secondary of TR1. After D1 rectifies, it charges C1.
- the voltage on C1 is proportional to the load current.
- the MCU reads C1. The voltage value is used to determine the load current.
- R26 acts as the discharge resistor for capacitor C1.
- Figure 6B is a schematic diagram of a zero crossing detection circuit in an embodiment of a power limiter in accordance with the present invention.
- the working principle The method of directly connecting to the zero-crossing detection port of the MCU after the resistor is divided by voltage, the advantage of the zero-crossing detection circuit is low cost, and the disadvantage is that the waveform does not have the standard of the zero-crossing detection circuit shown in FIG. 6A, and is susceptible to interference.
- FIG 8B is a schematic diagram of a thyristor drive circuit in accordance with an embodiment of a power limiter of the present invention.
- the working principle The control signal of the I/O port triggers the thyristor after the Q1 is reversed. When the driving capability of the I/O port is insufficient, the circuit needs to be used.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/529,766 US8766559B2 (en) | 2008-04-08 | 2008-04-25 | Constant power limiter and illumination device having same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008100664628A CN101257757B (zh) | 2008-04-08 | 2008-04-08 | 定功率限制器及照明灯具 |
CN200810066462.8 | 2008-04-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009124433A1 true WO2009124433A1 (zh) | 2009-10-15 |
Family
ID=39892131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2008/070798 WO2009124433A1 (zh) | 2008-04-08 | 2008-04-25 | 定功率限制器及照明灯具 |
Country Status (3)
Country | Link |
---|---|
US (1) | US8766559B2 (zh) |
CN (1) | CN101257757B (zh) |
WO (1) | WO2009124433A1 (zh) |
Cited By (1)
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CN117526726A (zh) * | 2024-01-05 | 2024-02-06 | 深圳市华浩德电子有限公司 | 一种宽电流和宽输出电压buck恒功率控制电路 |
Families Citing this family (8)
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CN101770248B (zh) * | 2008-12-31 | 2013-03-27 | 钱和革 | 一种间歇式供电的微功耗待机控制电路 |
CN102811535B (zh) * | 2012-06-28 | 2018-03-27 | 深圳市舜田电子技术有限公司 | 基于单级变换可控整流的超高效率led恒流电源 |
CN103479243B (zh) * | 2013-09-16 | 2016-09-14 | 九阳股份有限公司 | 一种安全食品加工机 |
CN103547032B (zh) * | 2013-10-21 | 2016-10-19 | 汇高(广州)电子有限公司 | 一种基于可控硅恒流的led灯具 |
WO2015061954A1 (zh) * | 2013-10-28 | 2015-05-07 | 巨铠实业股份有限公司 | 利用改变交流电电压导通角作为控制命令而对负载进行操作控制的方法与其调控装置 |
CN107491138B (zh) * | 2017-08-01 | 2019-02-19 | 江阴旺达电子有限公司 | 功率限制器及其控制方法 |
CN110535666B (zh) * | 2019-09-03 | 2021-12-31 | 普联技术有限公司 | 一种非标准PoE电源管理装置 |
CN116880639B (zh) * | 2023-09-07 | 2023-11-24 | 广东东菱电源科技有限公司 | 一种使用三极管实现恒功率的电路及恒功率方法 |
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JPS58182727A (ja) * | 1982-04-19 | 1983-10-25 | Ricoh Co Ltd | 定電力制御装置 |
US5087870A (en) * | 1989-10-05 | 1992-02-11 | Hewlett-Packard Company | Constant power circuit |
JPH0628042A (ja) * | 1991-02-12 | 1994-02-04 | Fuji Electric Co Ltd | 電源装置の電力制限装置 |
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US6969959B2 (en) * | 2001-07-06 | 2005-11-29 | Lutron Electronics Co., Inc. | Electronic control systems and methods |
US6982858B2 (en) * | 2003-04-29 | 2006-01-03 | Digitek Technology Co., Ltd. | Electronic power-saving power control circuit |
CN201194438Y (zh) * | 2008-04-08 | 2009-02-11 | 深圳和而泰智能控制股份有限公司 | 定功率限制器及照明灯具 |
-
2008
- 2008-04-08 CN CN2008100664628A patent/CN101257757B/zh not_active Expired - Fee Related
- 2008-04-25 US US12/529,766 patent/US8766559B2/en not_active Expired - Fee Related
- 2008-04-25 WO PCT/CN2008/070798 patent/WO2009124433A1/zh active Application Filing
Patent Citations (8)
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JPS58182727A (ja) * | 1982-04-19 | 1983-10-25 | Ricoh Co Ltd | 定電力制御装置 |
US5087870A (en) * | 1989-10-05 | 1992-02-11 | Hewlett-Packard Company | Constant power circuit |
JPH0628042A (ja) * | 1991-02-12 | 1994-02-04 | Fuji Electric Co Ltd | 電源装置の電力制限装置 |
CN2753094Y (zh) * | 2004-10-15 | 2006-01-18 | 王建荣 | 户外照明节电控制器 |
CN1668159A (zh) * | 2005-02-03 | 2005-09-14 | 程涛 | 照明电源智能节电装置 |
CN200947692Y (zh) * | 2006-07-03 | 2007-09-12 | 深圳市亚特尔科技有限公司 | 一种照明电器用节能控制器 |
CN101102630A (zh) * | 2006-07-07 | 2008-01-09 | 陈汉湘 | 户外照明灯智能光时控制器及其控制方法 |
CN101068448A (zh) * | 2007-04-25 | 2007-11-07 | 鹤山丽得电子实业有限公司 | 一种限制功率的电路 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117526726A (zh) * | 2024-01-05 | 2024-02-06 | 深圳市华浩德电子有限公司 | 一种宽电流和宽输出电压buck恒功率控制电路 |
CN117526726B (zh) * | 2024-01-05 | 2024-03-22 | 深圳市华浩德电子有限公司 | 一种宽电流和宽输出电压buck恒功率控制电路 |
Also Published As
Publication number | Publication date |
---|---|
US8766559B2 (en) | 2014-07-01 |
CN101257757A (zh) | 2008-09-03 |
US20110304278A1 (en) | 2011-12-15 |
CN101257757B (zh) | 2011-01-19 |
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