CN101621882A - Lighting circuit of refrigerating device - Google Patents
Lighting circuit of refrigerating device Download PDFInfo
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- CN101621882A CN101621882A CN200910183654A CN200910183654A CN101621882A CN 101621882 A CN101621882 A CN 101621882A CN 200910183654 A CN200910183654 A CN 200910183654A CN 200910183654 A CN200910183654 A CN 200910183654A CN 101621882 A CN101621882 A CN 101621882A
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Abstract
The invention discloses a lighting circuit of a refrigerating device, which comprises a sampling unit connected with an output circuit unit, a voltage stabilizing loop unit connected with the sampling unit, a first pulse width adjusting and controlling unit with one end connected with the voltage stabilizing loop unit and a second pulse width adjusting and controlling unit connected with the output end of the output circuit unit, wherein the sampling unit is used for extracting output signals of the output circuit unit as feedback signals; the voltage stabilizing loop unit is used for stably providing a stable feedback signal channel for the voltage stabilization of an entire power source; the other end of the first pulse width adjusting and controlling unit is connected with a power conversion unit and the pulse with adjusting and controlling unit is used for transmitting generated high-frequency oscillating signals to the power conversion unit; and the second pulse width adjusting and controlling unit is used for controlling the intensity of a load lamp. The invention has the advantages of high energy efficiency and low power consumption.
Description
Technical field
The present invention relates to a kind of lighting device, particularly a kind of lighting circuit of refrigerating device.
Background technology
In refrigeration plant, the someone proposes the interior lighting system and uses elongated light source, the form of fluorescent tube for example, this light source can vertically be installed on the wall of refrigeration plant, and purpose is to provide illumination for many compartments in the inner space separated from one another by dividing plate.The shortcoming of fluorescent lamp lighting circuit illumination is: circuit loss is big, and luminous efficiency is low, and the life-span is short, the maintenance cost height.
Summary of the invention
At above-mentioned technical problem, the purpose of this invention is to provide the lighting circuit of refrigerating device of a kind of high energy efficiency, low-power consumption.
The technical scheme that realizes the object of the invention is as follows:
Lighting circuit of refrigerating device, comprise the anti-electromagnetic interference unit, first rectification filtering unit, Power Conversion unit, second rectification filtering unit and the output circuit unit that connect successively, also comprise the sampling unit that is connected with output circuit unit, this sampling unit extracts output circuit unit output signal constantly as feedback signal; And the voltage stabilizing loop unit that is connected with sampling unit, this voltage stabilizing loop unit provides stable feedback signal passage for whole power supply voltage stabilizing; And the first pulse width modulation controlled unit that is connected with the voltage stabilizing loop unit of end, the other end of the first pulse width modulation controlled unit is connected with the Power Conversion unit, and the pulse width modulation controlled unit sends to the Power Conversion unit with the high-frequency oscillation signal that produces; And the second pulse width modulation controlled unit that is connected in the output of output circuit unit, this second pwm unit is used for the shading value of control load lamp.
Adopted such scheme, the first pulse width modulation controlled unit is connected with the Power Conversion unit, and the pulse width modulation controlled unit sends to the Power Conversion unit with the high-frequency oscillation signal that produces; High-frequency oscillation signal by the first pulse width modulation controlled unit, the driving power converter unit is transformed to low tension with high-tension electricity, and the first pulse width modulation controlled unit NCP1351 chip is by such setting, can reduce the power consumption of circuit, raise the efficiency, life-saving and be beneficial to energy savings.Second pwm unit is used for the shading value of control load lamp, utilize the width of output circuit unit pulse to adjust brightness, when adjusting load lamp (being LED) bright or dark, this basic frequency is immutable, but change the width of square wave on this frequency, width wide more then bright more, width is narrow more then dark more.Second pwm unit is lighting the time of control LED load lamp, rather than the voltage of change output is controlled brightness.
The output of output circuit unit also connects a short-circuit protection unit, and this short-circuit protection unit output is connected with the first pulse width modulation controlled unit.The short-circuit protection unit is that whole power safety operation provides safeguard, and when meeting accident short circuit, can prevent that the high short circuit current of amplitude from damaging circuit.
The output of output circuit unit also connects a current-limiting protection unit, and this current-limiting protection unit output is connected with the first pulse width modulation controlled unit.The current-limiting protection unit can protect load and power-supply system not to be subjected to the influence of overcurrent, guarantees the circuit safety operation.
Be connected with a pressurizer after the inverting input parallel connection of overvoltage comparator and constant current comparator.Constant current comparator and overvoltage comparator inverting input link together and connect reference voltage terminal, improve the circuit precision, and the constant current comparator is formed voltage with overvoltage comparator, the electric current double loop is controlled.The current-limiting protection unit is made of several simple components and parts, and not only circuit is simple, and the precision height, and is with low cost, and performance is also very stable.
The output of output circuit unit also connects an output over-voltage protection unit, and this output over-voltage protection unit output is connected with the first pulse width modulation controlled unit.When output voltage is too high, provide voltage-limiting protection by the output over-voltage protection unit.
The LED load lamp is connected in the output of output circuit unit.The LED load lamp has the long advantage of light efficiency height, life-span, by the LED lamp with after lighting circuit of the present invention combines, more can saves energy with respect to fluorescent lamp or incandescent lamp.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
In the accompanying drawing, 1 is anti-electromagnetic interference unit, and 2 is first rectification filtering unit; 3 is the Power Conversion unit, and 4 is second rectification filtering unit, and 5 is output circuit unit; 6 is the first pulse width modulation controlled unit; 7 are the voltage stabilizing loop unit, and 8 is sampling unit, and 9 is the short-circuit protection unit; 10 is the current limliting protected location; 11 is the output over-voltage protection unit, and 12 is the second pulse width modulation controlled unit, and 13 is the LED load lamp.
Embodiment
With reference to Fig. 1, lighting circuit of refrigerating device of the present invention, comprise the anti-electromagnetic interference unit 1, first rectification filtering unit 2, Power Conversion unit 3, second rectification filtering unit 4 and the output circuit unit 5 that connect successively, also comprise the sampling unit 8 that is connected with output circuit unit, this sampling unit extracts output circuit unit output signal constantly as feedback signal; And the voltage stabilizing loop unit 7 that is connected with sampling unit, this voltage stabilizing loop unit provides stable feedback signal passage for whole power supply voltage stabilizing.And one 6, the first pulse width modulation controlled unit 6, the first pulse width modulation controlled unit that are connected with voltage stabilizing loop unit 7 of end form by NCP1351 chip and peripheral circuit thereof.The other end of the first pulse width modulation controlled unit is connected with Power Conversion unit 3, and pulse width modulation controlled unit 6 sends to Power Conversion unit 3 with the high-frequency oscillation signal that produces, and with the driving power converter unit high-voltage variable is changed to low-voltage.And the second pulse width modulation controlled unit 12 that is connected in the output of output circuit unit, this second pwm unit is used for the shading value of control load lamp.
The output of output circuit unit 5 also connects a short-circuit protection unit 9, and this short-circuit protection unit output is connected with the first pulse width modulation controlled unit 6.The output of output circuit unit 5 also connects a current-limiting protection unit 10, and these current-limiting protection unit 10 outputs are connected with the first pulse width modulation controlled unit 6.Current-limiting protection unit 10 comprises constant current comparator and overvoltage comparator; the in-phase input end of constant current comparator is a current input terminal; the in-phase input end of overvoltage comparator is a voltage input end, is connected with a pressurizer after the inverting input parallel connection of overvoltage comparator and constant current comparator.Be connected a feedback resistance between the in-phase input end of the output of constant current comparator and this constant current comparator.The output of output circuit unit also connects an output over-voltage protection unit 11, and these output over-voltage protection unit 11 outputs are connected with the first pulse width modulation controlled unit 6.Output circuit unit connects a LED load lamp 13.
The course of work of the present invention is: alternating current is transported to first rectification filtering unit 2 after by 1 filtering of electromagnetic interference unit and carries out rectifying and wave-filtering, carry out behind the Power Conversion to second rectification filtering unit, 4 rectifying and wave-filterings, through output circuit unit 5 outputs through Power Conversion unit 3 again.The output signal that obtains by sampling unit 8 is as feedback signal, this signal is transported to the first pulse width modulation controlled unit 6 after by 7 voltage stabilizings of voltage stabilizing loop unit, by sending high-frequency oscillation signal to power inverter after the first pulse width modulation controlled cell processing, make power inverter that high-tension electricity is transformed to required low-voltage.During circuit working, can carry out short-circuit protection by short-circuit protection unit 9; Can limit high electric current by current-limiting protection unit 10 exerts an influence to circuit; Can limit the influence of high voltage by output over-voltage protection unit 11 to circuit.
Claims (8)
1. lighting circuit of refrigerating device, comprise the anti-electromagnetic interference unit (1), first rectification filtering unit (2), Power Conversion unit (3), second rectification filtering unit (4) and the output circuit unit (5) that connect successively, it is characterized in that, also comprise the sampling unit (8) that is connected with output circuit unit, this sampling unit extracts output circuit unit output signal constantly as feedback signal; And the voltage stabilizing loop unit (7) that is connected with sampling unit, this voltage stabilizing loop unit provides stable feedback signal passage for whole power supply voltage stabilizing; And the first pulse width modulation controlled unit (6) that is connected with the voltage stabilizing loop unit of end, the other end of the first pulse width modulation controlled unit is connected with the Power Conversion unit, and pulse width modulation controlled unit (6) send to the Power Conversion unit with the high-frequency oscillation signal that produces; And the second pulse width modulation controlled unit (12) that is connected in the output of output circuit unit, this second pwm unit is used for the shading value of control load lamp.
2. lighting circuit of refrigerating device according to claim 1 is characterized in that: the output of described output circuit unit also connects a short-circuit protection unit, and this short-circuit protection unit output is connected with the first pulse width modulation controlled unit (6).
3. lighting circuit of refrigerating device according to claim 1 is characterized in that: the output of described output circuit unit also connects a current-limiting protection unit (10), and this current-limiting protection unit (10) output is connected with the first pulse width modulation controlled unit (6).
4. lighting circuit of refrigerating device according to claim 3; it is characterized in that: current-limiting protection unit (10) comprise constant current comparator and overvoltage comparator; the in-phase input end of constant current comparator is a current input terminal; the in-phase input end of overvoltage comparator is a voltage input end, is connected with a pressurizer after the inverting input parallel connection of overvoltage comparator and constant current comparator.
5. constant current protective device according to claim 4 is characterized in that: be connected a feedback resistance between the in-phase input end of described constant current than the output of device and this constant current comparator.
6. lighting circuit of refrigerating device according to claim 1; it is characterized in that: the output of described output circuit unit also connects an output over-voltage protection unit (11), and this output over-voltage protection unit (11) output is connected with the first pulse width modulation controlled unit (6).
7. lighting circuit of refrigerating device according to claim 1 is characterized in that: the described first pulse width modulation controlled unit comprises the NCP1351 chip.
8. lighting circuit of refrigerating device according to claim 1 is characterized in that: also comprise a LED load lamp, this LED load lamp is connected in the output of output circuit unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910183654A CN101621882A (en) | 2009-08-14 | 2009-08-14 | Lighting circuit of refrigerating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910183654A CN101621882A (en) | 2009-08-14 | 2009-08-14 | Lighting circuit of refrigerating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101621882A true CN101621882A (en) | 2010-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910183654A Pending CN101621882A (en) | 2009-08-14 | 2009-08-14 | Lighting circuit of refrigerating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101621882A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223743A (en) * | 2010-04-16 | 2011-10-19 | 北京京东方光电科技有限公司 | Light emitting diode (LED) driving control circuit and method thereof |
| CN106571793A (en) * | 2016-11-08 | 2017-04-19 | 天津铁路信号有限责任公司 | Pulse width modulation circuit based on TL494 chip |
-
2009
- 2009-08-14 CN CN200910183654A patent/CN101621882A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223743A (en) * | 2010-04-16 | 2011-10-19 | 北京京东方光电科技有限公司 | Light emitting diode (LED) driving control circuit and method thereof |
| CN106571793A (en) * | 2016-11-08 | 2017-04-19 | 天津铁路信号有限责任公司 | Pulse width modulation circuit based on TL494 chip |
| CN106571793B (en) * | 2016-11-08 | 2023-08-25 | 天津铁路信号有限责任公司 | Pulse width modulation circuit based on TL494 chip |
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Application publication date: 20100106 |