CN101808447A - Input overvoltage delay protection circuit, LED control circuit and LED lamp - Google Patents
Input overvoltage delay protection circuit, LED control circuit and LED lamp Download PDFInfo
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- CN101808447A CN101808447A CN201010105354A CN201010105354A CN101808447A CN 101808447 A CN101808447 A CN 101808447A CN 201010105354 A CN201010105354 A CN 201010105354A CN 201010105354 A CN201010105354 A CN 201010105354A CN 101808447 A CN101808447 A CN 101808447A
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Abstract
The invention relates to an input overvoltage delay protection circuit, an LED control circuit and an LED lamp. The input overvoltage delay protection circuit comprises a voltage sampling unit, a protection signal generating unit, and a delay generating unit. The voltage sampling unit is used for sampling DC voltage to be detected to acquire sampling voltage; the protection signal generating unit comprises a three-end adjustable shunt reference source and is used for comparing the sampling voltage with voltage at the reference end of the three-end adjustable shunt reference source to generate a protection control signal; and the delay generating unit is used for adding positive feedback to the comparison side of the sampling voltage and the reference end of the three-end adjustable shunt reference source according to the change of the DC voltage to be detected, so that the sampling voltage changes along with the change of the DC voltage to be detected. Due to the adoption of the three-end adjustable shunt reference source, the input overvoltage delay protection circuit is formed. Therefore, the overvoltage protection control is realized, the precision of the protection voltage is better controlled, the delay voltage range is better set, the cost is low, and the occupied space is small.
Description
Technical field
The present invention relates to lighting technical field, more particularly, relate to a kind of input overvoltage delay protection circuit, LED control circuit and LED light fixture.
Background technology
Therefore advantages such as that led light source has is energy-efficient, the life-span is long, low pressure is controlled are widely used in each lighting field.At present; input side at the LED control circuit generally is not provided with protection circuit against input over-voltage; even design overvoltage crowbar; thereby also be to adopt comparator to constitute a hysteresis comparator circuit to realize overvoltage protection control; so the precision of protection voltage is with bad control, and the also inconvenience setting of hysteresis voltage scope; when especially adopting integrated operational amplifier to realize above-mentioned overvoltage crowbar, cost is higher and take up room bigger.
Summary of the invention
The technical problem to be solved in the present invention is; the bad control of precision and the inconvenience of hysteresis voltage scope of the protection voltage of the hysteresis comparator circuit that constitutes at the available technology adopting comparator are provided with; higher and the bigger defective that takes up room of cost provides a kind of input overvoltage delay protection circuit, LED control circuit and LED lamp when especially adopting integrated operational amplifier.
One of the technical solution adopted for the present invention to solve the technical problems is: a kind of input overvoltage delay protection circuit comprises:
The voltage sample unit is used for direct voltage to be detected is sampled, and obtains sampled voltage;
The guard signal generation unit that contains the adjustable shunting a reference source of three ends is used for the voltage of sampled voltage and the adjustable shunting a reference source of three ends reference edge is compared, and produces the protection control signal;
Delay generating unit is used for the variation according to described direct voltage to be detected, and the comparison side adding positive feedback at sampled voltage and the adjustable shunting a reference source of three ends reference edge makes sampled voltage change according to the variation of direct voltage to be detected.
Two of the technical solution adopted for the present invention to solve the technical problems is: a kind of LED control circuit; comprise that EMI filtering and rectification circuit, pfc circuit, DC isolate constant-current drive circuit; also comprise: output, output that input connects EMI filtering and rectification circuit connect the input overvoltage delay protection circuit that DC isolates constant-current drive circuit, and this input overvoltage delay protection circuit comprises:
The voltage sample unit is used for direct voltage to be detected is sampled, and obtains sampled voltage;
The guard signal generation unit that contains the adjustable shunting a reference source of three ends is used for the voltage of sampled voltage and the adjustable shunting a reference source of three ends reference edge is compared, and produces the protection control signal;
Delay generating unit is used for the variation according to described direct voltage to be detected, and the comparison side adding positive feedback at sampled voltage and the adjustable shunting a reference source of three ends reference edge makes sampled voltage change according to the variation of direct voltage to be detected.
Three of the technical solution adopted for the present invention to solve the technical problems is: the LED light fixture of using above-mentioned input overvoltage delay protection circuit.
Implement input overvoltage delay protection circuit of the present invention, LED control circuit and LED lamp; has following beneficial effect: realize overvoltage delay protection control thereby adopt the adjustable shunting a reference source of three ends to constitute input overvoltage delay protection circuit; the precision of protection voltage is better controlled; and the hysteresis voltage scope also better is provided with, and cost is lower and take up room less.In addition, the present invention can realize the voltage input of wide region.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit theory diagrams of input overvoltage delay protection circuit of the present invention;
Fig. 2 is the structured flowchart of LED control circuit of the present invention;
Fig. 3 is the partial circuit schematic diagram of LED control circuit of the present invention.
Embodiment
As shown in Figure 1, be the circuit theory diagrams of input overvoltage delay protection circuit of the present invention.
Input overvoltage delay protection circuit of the present invention comprises following components:
Voltage sample unit 1 is used for direct voltage to be detected is sampled, and obtains sampled voltage;
The guard signal generation unit 3 that contains the adjustable shunting a reference source of three ends is used for the voltage of sampled voltage and the adjustable shunting a reference source of three ends reference edge is compared, and produces the protection control signal;
Delay generating unit 2 is used for the variation according to described direct voltage to be detected, and the comparison side adding positive feedback at sampled voltage and the adjustable shunting a reference source of three ends reference edge makes sampled voltage change according to the variation of direct voltage to be detected.
From above-mentioned principle as can be seen, the embodiment of the invention is utilized three ends alternative comparator of adjustable shunting a reference source or integrated operational amplifier etc., makes circuit structure simple, reduced circuit cost, and the extensibility of this circuit is stronger.
Further, above-mentioned voltage sample unit 1 comprises resistance R 1, resistance R 2, resistance R 3 and capacitor C 1; Series resistance R1, resistance R 2, and resistance R 3 successively between the input VIN of direct voltage to be detected and ground, capacitor C 1 is connected in parallel on the circuit structure two ends that resistance R 2 and resistance R 3 are in series, and this circuit obtains described sampled voltage from the node that resistance R 1 links to each other with resistance R 2.
Further, above-mentioned guard signal generation unit 3 comprises the adjustable shunting a reference source of three ends U1, resistance R 4, resistance R 5, resistance R 8, resistance R 9, resistance R 10, resistance R 11 and triode Q2; The reference edge of three ends are adjustable shunting a reference source U1 connects the node that resistance R 1 links to each other with resistance R 2, the anode of three ends are adjustable shunting a reference source U1 is connected to ground, the negative electrode of three ends are adjustable shunting a reference source U1 connects the output of direct current supply voltage VCC by resistance R 4, the negative electrode of three ends are adjustable shunting a reference source U1 connects an end of resistance R 5, utilize resistance R 5 and resistance R 4 to obtain above-mentioned bias voltage from direct current supply voltage VCC, it is the end that the other end of resistance R 5 connects resistance R 6 in the delay generating unit 2, the output of direct current supply voltage VCC connects the collector electrode of triode Q2 by resistance R 8, connect resistance R 11 between the collector and emitter of triode, the grounded emitter of triode Q2, the base stage of triode Q2 is by resistance R 10 ground connection, and the base stage of triode Q2 also connects the input of above-mentioned bias voltage by resistance R 9, and promptly the base stage of triode Q2 connects the other end of resistance R 5 by resistance R 9.The adjustable shunting a reference source of above-mentioned three ends U1 preferably adopts the TL431 chip.
Further, above-mentioned delay generating unit 2 comprises: resistance R 6, resistance R 7, triode Q1; The collector electrode of triode Q1 is connected to the node that resistance R 2 links to each other with resistance R 3, the emitter of triode Q1 is connected to ground, be connected resistance R 7 between the base stage of triode Q1 and the emitter, the base stage of triode Q1 connects the input of a bias voltage, the i.e. other end of resistance R 5 by resistance R 6.
In Fig. 1, port VIN is used to import direct voltage to be detected; Port CTRL, promptly the end that links to each other with resistance R 6 of resistance R 5 is low level guard signal output, and is effective when the low level guard signal is low level; Port CTRL1, promptly the collector electrode of triode Q2 is high level guard signal output, and is effective when the high level guard signal is high level.Direct voltage U to be detected when port VIN input
VINWhen normal voltage rises gradually, the reference voltage terminal U of three ends are adjustable shunting a reference source U1
VrefLess than 2.5V, not conducting of U1, port CTRL is a high level, port CTRL1 place is a low level, triode Q1 conducting, U
Vref=U
VIN* R2/ (R1+R2)＜2.5V, do not belong to overvoltage condition this moment, and LED equipment need not be protected.Direct voltage U to be detected when port VIN input
VINWhen rising to certain threshold value, shunting a reference source U1 conducting that three ends are adjustable, port CTRL is a low level, and port CTRL1 place is a high level, and triode Q1 turn-offs, U
Vref=U
VIN* (R2+R3)/(R1+R2+R3)＞and 2.5V, belong to overvoltage condition this moment, and LED equipment need be protected.Direct voltage U to be detected when port VIN input
VINDuring from high voltage drop to certain threshold value, U
Vref=U
VIN* (R2+R3) (/R1+R2+R3) near 2.5V, U1 is approximate to be turn-offed, and the CTRL end is a high level, and port CTRL1 place is a low level, the Q1 conducting, Vref=VIN * R2/ (R1+R2)＜2.5V, should cancel the protection of LED equipment this moment.When the CTRL end was low level, triode Q2 turn-offed, and the CTRL1 end is a high level, and when the CTRL end was high level, triode Q2 was open-minded, and the CTRL1 end is a low level.CTRL and CTRL1 are not high level and low level simultaneously, so can control the overvoltage protection state of LED equipment at any time by the level situation that detects CTRL and CTRL1.
As shown in Figure 2, the LED control circuit comprises following components successively usually: EMI filtering and rectification circuit 10, pfc circuit 20 are isolated constant-current drive circuit 30 with DC.The DC here isolates constant-current drive circuit 30 and generally includes: PWM generator controller, half-bridge drive circuit, isolating transformer, power output circuit, current detection circuit.The output voltage of above-mentioned pfc circuit 20 offers half-bridge drive circuit and power output circuit as supply power voltage, half-bridge drive circuit mainly is made of two metal-oxide-semiconductors, PWM generator controller output pwm pulse ripple is used to drive half-bridge drive circuit, the voltage of half-bridge drive circuit output passes through isolating transformer successively, export to led light source equipment behind the power output circuit, usually LED is a constant-current driving, so also will be by the current signal of current detection circuit detection power output circuit output, and be translated into the detection signal of importing the PWM generator controller, adjust the output parameter of pwm pulse ripple in order to instruct the PWM generator controller.Herein, input overvoltage delay protection circuit of the present invention 40 shown in Figure 1 can be applicable in the above-mentioned LED control circuit.Wherein, the input of input overvoltage delay protection circuit 40 connects the output of EMI filtering and rectification circuit 10, and the output of input overvoltage delay protection circuit 40 connects the overvoltage input end that DC isolates PWM generator controller in the constant-current drive circuit 30.The circuit theory of the input overvoltage delay protection circuit 40 here, and circuit structure is all identical with above-mentioned description about Fig. 1, in this no longer repeat specification.
In addition, pfc circuit 20 is circuit of power factor correction, and the English full name of PFC is PowerFactor Correction.
Fig. 3 is the circuit diagram of LED control circuit of the present invention.LED control circuit of the present invention comprises EMI filtering and rectification circuit 10, pfc circuit 20, DC isolation constant-current drive circuit 30 and input overvoltage delay protection circuit 40.
EMI filtering and rectification circuit 10 comprise EMI filter circuit and rectification circuit two parts, wherein, the EMI filter circuit comprises protective tube F1, piezo-resistance VR1, resistance R 33, capacitor C X1, capacitor C X2, capacitor C Y1, capacitor C Y2, capacitor C Y3, capacitor C Y4, the first common mode choke coil L1, the second common mode choke coil L2, inductance L 3 and inductance L 4.First end of protective tube F1 is connected to the live wire end J1 of power supply input, second end of protective tube F1 is connected to the end of first coil of the first common mode choke coil L1, the head end of first coil of the first common mode choke coil L1 is connected to the head end of first coil of the second common mode choke coil L2, the end of first coil of the second common mode choke coil L2 is connected to first end of inductance L 3, and second end of inductance L 3 is connected to the input anode of rectifier bridge; The end of second coil of the first common mode choke coil L1 is connected to the zero line side J2 of power supply input, the head end of second coil of the first common mode choke coil L1 is connected to the head end of second coil of the second common mode choke coil L2, the end of second coil of the second common mode choke coil L2 is connected to first end of inductance L 4, and second end of inductance L 4 is connected to the input cathode of rectifier bridge; Piezo-resistance VR1 is connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1; Resistance R 33 is connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1; Capacitor C X1 is connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1; Be connected between the end of second coil of the end of first coil of the first common mode choke coil L1 and the first common mode choke coil L1 tie point ground protection of capacitor C Y1 and capacitor C Y2 after capacitor C Y1 and the capacitor C Y2 series connection; Be connected between the head end of second coil of the head end of first coil of first common mode choke coil and first common mode choke coil tie point ground protection of capacitor C Y3 and capacitor C Y4 after capacitor C Y3 and the capacitor C Y4 series connection; Capacitor C X2 is connected between the end of second coil of the end of first coil of the second common mode choke coil L2 and the second common mode choke coil L2.Rectification circuit mainly is made of the rectifier bridge that diode D1, diode D2, diode D3 and diode D4 form.The input anode of the just very rectifier bridge of diode D1, the input cathode of the just very rectifier bridge of diode D3.
The output of input overvoltage delay protection circuit 40 directly connects the PWM generator controller, and the input of input overvoltage delay protection circuit 40 connects rectifier bridge by resistance R 102, resistance 101, resistance R 100, diode D25, diode D26 and capacitor C 100.The input anode of rectifier bridge is connected to the positive pole of diode D25, the negative pole of diode D25 is connected to first end of resistance R 100, second end of resistance R 100 is connected to ground by capacitor C 100, second end that the negative pole that the input cathode of rectifier bridge is connected to positive pole, the diode D26 of diode D26 is connected to first end of resistance R 101, resistance R 101 is connected to port VIN by resistance R 102, and second end of resistance R 100 links to each other with second end of resistance R 101.Supply power voltage VCC in the input overvoltage delay protection circuit 40 is provided by the output of rectification circuit 10.
In the embodiment of the invention, the pulse frequency modulated chip that pfc circuit 20 main employing models are OB6563 is realized, it utilizes critical current interrupter duty pattern, by regulating frequency and duty ratio, guarantee that output voltage 395V is stable, reduce the reverse recovery power consumption and the noise of rectifying tube, when correcting power factor (PF), improved efficient.Further, also can adopt the pulse frequency adjuster of other model to realize, be the pulse frequency modulated chip of carrying musical instruments used in a Buddhist or Taoist mass of L6561 as adopting model, is used to carry out Active PFC, and its frequency range can be from tens KHZ to hundreds of KHZ.
DC isolation constant-current drive circuit 30 is mainly the led light source operate as normal provides the constant output electric current.
The low level guard signal that high level guard signal that input overvoltage delay protection circuit 40 middle port CTRL places are produced and port CTRL1 place produce is as the control signal of DC isolation constant-current drive circuit 30; thereby control is opened or is turn-offed DC and isolates constant-current drive circuit 30, and DC isolates constant-current drive circuit 30 and export a constant output electric current that is used for led light source work when opening.
Above-mentioned LED Drive and Control Circuit is applied to can realize on the LED light fixture having the LED light fixture of input overvoltage delay protection; this light fixture comprises LED control circuit and connected led light source; the LED control circuit comprises EMI filtering and rectification circuit; pfc circuit; DC isolates constant-current drive circuit; and input connects the output of EMI filtering and rectification circuit, the input overvoltage delay protection circuit that output connection DC isolates constant-current drive circuit; the interlock circuit principle no longer is repeated in this description at this with reference to above-mentioned related description herein.
The above only is embodiments of the invention, not in order to restriction the present invention, all any modifications of being done in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.
Claims (9)
1. an input overvoltage delay protection circuit is characterized in that, comprising:
The voltage sample unit is used for direct voltage to be detected is sampled, and obtains sampled voltage;
The guard signal generation unit that contains the adjustable shunting a reference source of three ends is used for the voltage of sampled voltage and the adjustable shunting a reference source of three ends reference edge is compared, and produces the protection control signal;
Delay generating unit is used for the variation according to described direct voltage to be detected, and the comparison side adding positive feedback at sampled voltage and the adjustable shunting a reference source of three ends reference edge makes sampled voltage change according to the variation of direct voltage to be detected.
2. input overvoltage delay protection circuit according to claim 1 is characterized in that, described voltage sample unit comprises resistance R 1, resistance R 2, resistance R 3 and capacitor C 1; Series resistance R1, resistance R 2, and resistance R 3 successively between the input VIN of direct voltage to be detected and ground, capacitor C 1 is connected in parallel on the circuit structure two ends that resistance R 2 and resistance R 3 are in series, and this circuit obtains described sampled voltage from the node that resistance R 1 links to each other with resistance R 2.
3. input overvoltage delay protection circuit according to claim 2 is characterized in that, described guard signal generation unit comprises the adjustable shunting a reference source of three ends U1, resistance R 4, resistance R 5, resistance R 8, resistance R 9, resistance R 10, resistance R 11 and triode Q2; The reference edge of three ends are adjustable shunting a reference source U1 connects the node that resistance R 1 links to each other with resistance R 2, the anode of three ends are adjustable shunting a reference source U1 is connected to ground, the negative electrode of three ends are adjustable shunting a reference source U1 connects the output of direct current supply voltage VCC by resistance R 4, the negative electrode of three ends are adjustable shunting a reference source U1 connects an end of resistance R 5, the output of direct current supply voltage VCC connects the collector electrode of triode Q2 by resistance R 8, connect resistance R 11 between the collector and emitter of triode, the grounded emitter of triode Q2, the base stage of triode Q2 is by resistance R 10 ground connection, and the base stage of triode Q2 also connects the other end of resistance R 5 by resistance R 9.
4. input overvoltage delay protection circuit according to claim 3 is characterized in that, described delay generating unit comprises: resistance R 6, resistance R 7, triode Q1; The collector electrode of triode Q1 is connected to the node that resistance R 2 links to each other with resistance R 3, and the emitter of triode Q1 is connected to ground, is connected resistance R 7 between the base stage of triode Q1 and the emitter, and the base stage of triode Q1 connects the other end of resistance R 5 by resistance R 6.
5. LED control circuit; comprise that EMI filtering and rectification circuit, pfc circuit, DC isolate constant-current drive circuit; it is characterized in that; also comprise: output, output that input connects EMI filtering and rectification circuit connect the input overvoltage delay protection circuit that DC isolates constant-current drive circuit, and this input overvoltage delay protection circuit comprises:
The voltage sample unit is used for direct voltage to be detected is sampled, and obtains sampled voltage;
The guard signal generation unit that contains the adjustable shunting a reference source of three ends is used for the voltage of sampled voltage and the adjustable shunting a reference source of three ends reference edge is compared, and produces the protection control signal;
Delay generating unit is used for the variation according to described direct voltage to be detected, and the comparison side adding positive feedback at sampled voltage and the adjustable shunting a reference source of three ends reference edge makes sampled voltage change according to the variation of direct voltage to be detected.
6. LED control circuit according to claim 5 is characterized in that, described voltage sample unit comprises resistance R 1, resistance R 2, resistance R 3 and capacitor C 1; Series resistance R1, resistance R 2, and resistance R 3 successively between the input VIN of direct voltage to be detected and ground, capacitor C 1 is connected in parallel on the circuit structure two ends that resistance R 2 and resistance R 3 are in series, and this circuit obtains described sampled voltage from the node that resistance R 1 links to each other with resistance R 2.
7. LED control circuit according to claim 6 is characterized in that, described guard signal generation unit comprises the adjustable shunting a reference source of three ends U1, resistance R 4, resistance R 5, resistance R 8, resistance R 9, resistance R 10, resistance R 11 and triode Q2; The reference edge of three ends are adjustable shunting a reference source U1 connects the node that resistance R 1 links to each other with resistance R 2, the anode of three ends are adjustable shunting a reference source U1 is connected to ground, the negative electrode of three ends are adjustable shunting a reference source U1 connects the output of direct current supply voltage VCC by resistance R 4, the negative electrode of three ends are adjustable shunting a reference source U1 connects an end of resistance R 5, the output of direct current supply voltage VCC connects the collector electrode of triode Q2 by resistance R 8, connect resistance R 11 between the collector and emitter of triode, the grounded emitter of triode Q2, the base stage of triode Q2 is by resistance R 10 ground connection, and the base stage of triode Q2 also connects the other end of resistance R 5 by resistance R 9.
8. LED control circuit according to claim 7 is characterized in that, described delay generating unit comprises: resistance R 6, resistance R 7, triode Q1; The collector electrode of triode Q1 is connected to the node that resistance R 2 links to each other with resistance R 3, and the emitter of triode Q1 is connected to ground, is connected resistance R 7 between the base stage of triode Q1 and the emitter, and the base stage of triode Q1 connects the other end of resistance R 5 by resistance R 6.
9. LED light fixture; comprise LED control circuit and connected led light source; described LED control circuit comprises that EMI filtering and rectification circuit, pfc circuit, DC isolate constant-current drive circuit; it is characterized in that; described LED control circuit also comprises: output, output that input connects EMI filtering and rectification circuit connect the input overvoltage delay protection circuit that DC isolates constant-current drive circuit, and this input overvoltage delay protection circuit comprises:
The voltage sample unit is used for direct voltage to be detected is sampled, and obtains sampled voltage;
The guard signal generation unit that contains the adjustable shunting a reference source of three ends is used for the voltage of sampled voltage and the adjustable shunting a reference source of three ends reference edge is compared, and produces the protection control signal;
Delay generating unit is used for the variation according to described direct voltage to be detected, and the comparison side adding positive feedback at sampled voltage and the adjustable shunting a reference source of three ends reference edge makes sampled voltage change according to the variation of direct voltage to be detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101053544A CN101808447B (en) | 2010-01-29 | 2010-01-29 | Input overvoltage delay protection circuit, LED control circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101053544A CN101808447B (en) | 2010-01-29 | 2010-01-29 | Input overvoltage delay protection circuit, LED control circuit and LED lamp |
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| CN101808447A true CN101808447A (en) | 2010-08-18 |
| CN101808447B CN101808447B (en) | 2013-03-27 |
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| CN2010101053544A Expired - Fee Related CN101808447B (en) | 2010-01-29 | 2010-01-29 | Input overvoltage delay protection circuit, LED control circuit and LED lamp |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752913A (en) * | 2012-02-07 | 2012-10-24 | 深圳市比格利电源科技有限公司 | Light-emitting diode (LED) driving power supply and LED lighting lamp |
| CN103327693A (en) * | 2013-06-24 | 2013-09-25 | 华南理工大学 | LED lamp intelligent driving device with built-in WIFI and achieving method thereof |
| CN104538936A (en) * | 2014-12-12 | 2015-04-22 | 广州金升阳科技有限公司 | Input overvoltage protection circuit of switching power supply |
| CN106026656A (en) * | 2016-07-08 | 2016-10-12 | 上海电科电器科技有限公司 | Hysteresis type power supply circuit |
| CN111722029A (en) * | 2019-03-21 | 2020-09-29 | 杭州海康威视数字技术股份有限公司 | Detection device and method for power supply mode of network camera and network camera |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060132061A1 (en) * | 2004-09-10 | 2006-06-22 | Color Kinetics Incorporated | Power control methods and apparatus for variable loads |
| CN1913272A (en) * | 2005-08-11 | 2007-02-14 | 艾默生网络能源系统有限公司 | Novel input undervoltage/overvoltage protection circuit |
| CN201243392Y (en) * | 2008-07-04 | 2009-05-20 | 比亚迪股份有限公司 | LED drive circuit |
-
2010
- 2010-01-29 CN CN2010101053544A patent/CN101808447B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060132061A1 (en) * | 2004-09-10 | 2006-06-22 | Color Kinetics Incorporated | Power control methods and apparatus for variable loads |
| CN1913272A (en) * | 2005-08-11 | 2007-02-14 | 艾默生网络能源系统有限公司 | Novel input undervoltage/overvoltage protection circuit |
| CN201243392Y (en) * | 2008-07-04 | 2009-05-20 | 比亚迪股份有限公司 | LED drive circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752913A (en) * | 2012-02-07 | 2012-10-24 | 深圳市比格利电源科技有限公司 | Light-emitting diode (LED) driving power supply and LED lighting lamp |
| CN103327693A (en) * | 2013-06-24 | 2013-09-25 | 华南理工大学 | LED lamp intelligent driving device with built-in WIFI and achieving method thereof |
| CN104538936A (en) * | 2014-12-12 | 2015-04-22 | 广州金升阳科技有限公司 | Input overvoltage protection circuit of switching power supply |
| CN106026656A (en) * | 2016-07-08 | 2016-10-12 | 上海电科电器科技有限公司 | Hysteresis type power supply circuit |
| CN106026656B (en) * | 2016-07-08 | 2019-01-25 | 上海电科电器科技有限公司 | Sluggish type power circuit |
| CN111722029A (en) * | 2019-03-21 | 2020-09-29 | 杭州海康威视数字技术股份有限公司 | Detection device and method for power supply mode of network camera and network camera |
| CN111722029B (en) * | 2019-03-21 | 2023-03-07 | 杭州海康威视数字技术股份有限公司 | Detection device and method for power supply mode of network camera and network camera |
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| Publication number | Publication date |
|---|---|
| CN101808447B (en) | 2013-03-27 |
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