CN102447405A - LED (light-emitting diode) lamp switch power supply circuit and control method - Google Patents
LED (light-emitting diode) lamp switch power supply circuit and control method Download PDFInfo
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- CN102447405A CN102447405A CN2011104536955A CN201110453695A CN102447405A CN 102447405 A CN102447405 A CN 102447405A CN 2011104536955 A CN2011104536955 A CN 2011104536955A CN 201110453695 A CN201110453695 A CN 201110453695A CN 102447405 A CN102447405 A CN 102447405A
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Abstract
The invention discloses an LED (light-emitting diode) lamp switch power supply circuit and a control method. The LED lamp switch power supply circuit comprises a primary side circuit, a secondary side circuit, a pulse width modulation and control circuit, a secondary side current sampling circuit and a secondary side output voltage sampling circuit, wherein the primary side circuit comprises a switch pipe and a switch pipe driving circuit; the secondary side circuit comprises a rectification circuit and the output end of the switch power supply circuit; the switch pipe drive circuit is connected with the PWM (pulse width modulation) control signal output end of the pulse width modulation and control circuit; the current sample signal output end of the secondary side current sampling circuit is connected with the current signal input end of the pulse width modulation and control circuit; and the sample signal output end of the secondary side output voltage sampling circuit is connected with the voltage signal input end of the pulse width modulation and control circuit. According to the invention, one pulse width modulation and control circuit is adopted to carry out pulse width control on the driving circuit of the primary side circuit switch pipe and carry out constant voltage and constant current control on the output of the secondary side circuit; and the devices in the circuit are less, the circuit is simple, and cost is low.
Description
[technical field]
The present invention relates to the LED lamp, relate in particular to a kind of LED lamp switch power circuit and control method.
[background technology]
The switching power circuit of tradition LED lamp, the topological structure of employing half-bridge mode, former limit circuit need be used special chip driving switch pipe, and secondary circuit also need be controlled time constant voltage and the constant current of limit output with other special integrated circuit.Because former limit all needs special chip with time limit, its shortcoming is that the circuit elements device is many, complicated circuit, and cost is higher.
[summary of the invention]
The technical problem that originally will solve provides a kind of control method of LED lamp switch power circuit, so that the components and parts of circuit are less, circuit is simple, and cost is lower.
It is few that another technical problem that will solve of the present invention provides a kind of circuit elements device, and circuit is simple, lower-cost LED lamp switch power circuit.
In order to solve the problems of the technologies described above; The technical scheme that the present invention adopts is; A kind of control method of LED lamp switch power circuit; By a control circuit for pulse-width modulation drive circuit of the former limit of LED lamp switch power circuit contactor pipe is carried out pulse width control, constant voltage, constant current control are carried out in the output of secondary circuit.
A kind of technical scheme of LED lamp switch power circuit is; Comprise former limit circuit, secondary circuit, control circuit for pulse-width modulation, inferior limit current sampling circuit and inferior limit output voltage sampling circuit; Described secondary circuit comprises the output of rectification circuit and switching power circuit; Described switching tube drive circuit connects the pwm control signal output of control circuit for pulse-width modulation, the current signal input of inferior limit current sampling circuit current sampling signal output termination control circuit for pulse-width modulation; The voltage signal input of the voltage sampling signal output termination control circuit for pulse-width modulation of inferior polygonal voltage sample circuit.
Described control circuit for pulse-width modulation is the TL494 chip, and described switching tube drive circuit comprises elementary full bridge driving circuit, secondary drive circuit and driving transformer, and elementary full bridge driving circuit and secondary drive circuit are through the driving transformer coupling; The 8th pin and the 11st pin of the input termination TL494 chip of elementary full bridge driving circuit, the 14th pin of TL494 chip connects the 13rd pin, and the 8th pin and the 11st pin of TL494 chip are exported with push pull mode; The control utmost point of the output termination switching tube of secondary drive circuit.
Described elementary full bridge driving circuit comprises the former limit winding of said driving transformer, a NPN triode, the 2nd NPN triode, a PNP triode, the 2nd PNP triode, first base resistance and second base resistance; The collector electrode of the one NPN triode and the 2nd NPN triode connects the energization pins of chip, the grounded collector of a PNP triode and the 2nd PNP triode; The base stage of the one NPN triode connects the base stage of a PNP triode, and connects 8 pin of TL494 chip; The base stage of the 2nd NPN triode connects the base stage of the 2nd PNP triode, and connects 11 pin of TL494 chip; The emitter of the one NPN triode connects the emitter of a PNP triode, and the emitter of the 2nd NPN triode connects the emitter of the 2nd PNP triode; First base resistance connects the base stage of a NPN triode and the energization pins of chip, and second base resistance connects the base stage of the 2nd NPN triode and the energization pins of chip; First termination the one NPN triode of the former limit of transformer winding and the emitter of a PNP triode, second termination the 2nd NPN triode of the former limit of transformer winding and the emitter of a PNP triode.
Described elementary full bridge driving circuit comprises first fly-wheel diode, second fly-wheel diode, the 3rd fly-wheel diode and the 4th fly-wheel diode; The plus earth of first fly-wheel diode and second fly-wheel diode, the negative electrode of the 3rd fly-wheel diode and the 4th fly-wheel diode connects the energization pins of chip; The anode of the negative electrode of first fly-wheel diode and the 3rd fly-wheel diode connects first end of the former limit of transformer winding, and the anode of the negative electrode of second fly-wheel diode and the 4th fly-wheel diode connects second end of the former limit of transformer winding.
Described elementary full bridge driving circuit comprises capacitance, and described capacitance is serially connected between first end and the NPN transistor emitter of the former limit of transformer winding or between second end and the 2nd NPN transistor emitter of the former limit of transformer winding.
Described secondary drive circuit comprises secondary winding, PNP triode, forward drive resistance, first diode and second diode of said driving transformer; The collector electrode of PNP triode connects the control utmost point of said switching tube and the negative electrode of first diode, and the anode of first diode connects first end of forward drive resistance; First end of the second termination driving transformer secondary winding of forward drive resistance, the second termination output end of switching tube of driving transformer secondary winding; The base stage of PNP triode connects the anode of first diode, and the collector electrode of PNP triode connects the anode of second diode, and the negative electrode of second diode connects second end of driving transformer secondary winding.
Described secondary drive circuit comprises suppression resistor, and described suppression resistor connects the control utmost point and the output end of switching tube of switching tube.
Above-described LED lamp switch power circuit; Comprise the first reference voltage acquisition cuicuit; Inferior polygonal voltage sample circuit comprises first divider resistance and second divider resistance; First divider resistance and the series connection of second divider resistance, the positive pole of a termination switching power circuit output of voltage sampling circuit, other end ground connection; Tie point between first divider resistance and second divider resistance connects the 1st pin of TL494 chip; The described first reference voltage acquisition cuicuit comprises the 3rd divider resistance and the 4th divider resistance, the 3rd divider resistance and the series connection of the 4th divider resistance, the 14th pin of a termination TL494 chip of the first reference voltage acquisition cuicuit, other end ground connection; The 2nd pin of TL494 chip connects the tie point between the 3rd divider resistance and the 4th divider resistance, and the reference voltage of TL494 chip the 14th pin is through the 3rd divider resistance and the 4th divider resistance voltage after partial, as the reference voltage of the 2nd pin.
Above-described LED lamp switch power circuit comprises the second reference voltage acquisition cuicuit, and inferior limit current sampling circuit comprises current sampling resistor; The output negative busbar of switching power circuit ground connection between rectification circuit and output; Described current sampling resistor is serially connected between the output negative busbar earth point and output of switching power circuit, and the 16th pin of TL494 chip connects the output of the output negative busbar of switching power circuit; The second reference voltage acquisition cuicuit comprises adjustable divider resistance and the 5th divider resistance, adjustable divider resistance and the series connection of the 5th divider resistance, the 4th pin of a termination TL494 chip of the second reference voltage acquisition cuicuit, other end ground connection; The 15th pin of TL494 chip connects the tie point between adjustable divider resistance and the 5th divider resistance, and the reference voltage of TL494 chip the 14th pin is through adjustable divider resistance and the 5th divider resistance voltage after partial, as the reference voltage of the 15th pin.
The present invention adopts a control circuit for pulse-width modulation that the drive circuit of former limit contactor pipe is carried out pulse width control, constant voltage, constant current control are carried out in the output of secondary circuit, and the components and parts of circuit are less, and circuit is simple, and cost is lower.
[description of drawings]
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Fig. 1 is the theory diagram of LED lamp switch power circuit embodiment of the present invention.
Fig. 2 is the partial circuit figure of LED lamp switch power circuit embodiment of the present invention.
Fig. 3 is another part circuit diagram of LED lamp switch power circuit embodiment of the present invention.
[embodiment]
Comprise EMI filter circuit, surge restraint circuit, rectification circuit, power factor correction circuit, semi-bridge alternation circuit, high frequency switch transformer, output rectifier and filter, sample circuit, control circuit for pulse-width modulation and switching tube drive circuit at LED lamp switch power circuit embodiment of the present invention shown in Figure 1 as secondary circuit as former limit circuit.
The switching tube drive circuit connects the pwm control signal output of control circuit for pulse-width modulation.
Sample circuit comprises time limit current sampling circuit and time polygonal voltage sample circuit., the current signal input of inferior limit current sampling circuit current sampling signal output termination control circuit for pulse-width modulation; The voltage signal input of the voltage sampling signal output termination control circuit for pulse-width modulation of inferior polygonal voltage sample circuit.
After civil power gets into LED lamp switch power supply, remove high frequency clutter and interference signal through the EMI circuit earlier, then through over commutation and PFC (Active PFC) circuit again filtering obtain required high voltage direct current.Then transfer direct current to the dither direct current, deliver to the high frequency switch transformer step-down again through the semi-bridge alternation circuit.Rectification filtering high-frequency ac part then, so last output supplies the required low-voltage DC of LED lamp.
As shown in Figures 2 and 3, the control circuit for pulse-width modulation of present embodiment employing is TL494 voltage driven type pulse width modulating chip (a TL494 chip).The internal circuit of TL494 (U5) is made up of reference voltage generating circuit, oscillating circuit, intermittent phase adjustment circuit, two error amplifiers, pulse-width modulation comparator and output circuits etc.
1,2 pin of TL494 chip are homophase and the inverting input of error comparison amplifier I.3 pin are public outputs of control comparison amplifier and error comparison amplifier.4 pin are dead band level control end.5,6 pin are respectively applied for external oscillation resistance and oscillating capacitance.7 pin are earth terminal.8,9 pin and 11,10 pin are respectively inner two the final stage output triode collector and emitters of TL494.12 pin are power supply side.13 pin are the function output control terminal, when this pin connects 14 pin for recommending the way of output.14 pin are the 5V reference voltage output end.15,16 pin are anti-phase and in-phase input ends of error comparison amplifier II.
The switching tube drive circuit comprises elementary full bridge driving circuit, secondary drive circuit and driving transformer T1, and elementary full bridge driving circuit and secondary drive circuit are through driving transformer T1 coupling.The 8th pin and the 11st pin of the input termination TL494 chip of elementary full bridge driving circuit, the 14th pin of TL494 chip connects the 13rd pin, and the 8th pin and the 11st pin of TL494 chip are exported with push pull mode.The control utmost point of the output termination switching tube of secondary drive circuit.
Elementary full bridge driving circuit comprises the former limit winding T1C of driving transformer T1, a NPN triode Q12, the 2nd NPN triode Q13, a PNP triode Q14, the 2nd PNP triode Q15, the first base resistance R77 and the second base resistance R76.
The collector electrode of the one NPN triode Q12 and the 2nd NPN triode Q13 meets the energization pins Vcc of chip, the grounded collector of a PNP triode Q14 and the 2nd PNP triode Q15 through resistance R 90.
The base stage of the one NPN triode Q12 connects the base stage of a PNP triode Q14, and connects 8 pin of TL494 chip.
The base stage of the 2nd NPN triode Q13 connects the base stage of the 2nd PNP triode Q15, and connects 11 pin of TL494 chip.
The emitter of the one NPN triode Q12 connects the emitter of a PNP triode Q14, and the emitter of the 2nd NPN triode Q13 connects the emitter of the 2nd PNP triode Q15.
The first base resistance R77 connects base stage and the collector electrode of a NPN triode Q12, and the second base resistance R76 connects base stage and the collector electrode of the 2nd NPN triode Q13.
First termination the one NPN triode Q12 of the former limit of transformer winding T1C and the emitter of a PNP triode Q14, second end of the former limit of transformer winding T1C connects the emitter of the 2nd a NPN triode Q13 and a PNP triode Q14 through capacitance C39.
The plus earth of first sustained diode 24 and second sustained diode 21, the negative electrode of the 3rd sustained diode 19 and the 4th sustained diode 20 meets the energization pins Vcc of chip through resistance R 90.The anode of the negative electrode of first sustained diode 24 and the 3rd fly-wheel diode 19D connects first end of the former limit of transformer winding T1C, and the anode of the negative electrode of second sustained diode 21 and the 4th sustained diode 20 connects second end of the former limit of transformer winding T1C through capacitance C39.
Semi-bridge alternation circuit as former limit circuit comprises two switching tube Q9 and Q11, and each is driven two switching tube Q9 and Q11 by 1 secondary drive circuit, and two secondary drive circuit structures are identical with principle up and down, only introduces the secondary drive circuit of driving Q11 here.
The secondary drive circuit that drives Q11 comprises secondary winding T1A, PNP triode Q10, forward drive resistance R 48, diode D23 and the diode D16 of driving transformer T1; The collector electrode of PNP triode Q10 connects the control utmost point of switching tube Q11 and the negative electrode of diode D23, and the anode of diode D23 connects first end of forward drive resistance R 48.First end of the second termination driving transformer T1 secondary winding T1A of forward drive resistance R 48, the output of the second termination switching tube Q11 of driving transformer T1 secondary winding T1A.The base stage of PNP triode Q10 connects the anode of diode D23, and the collector electrode of PNP triode Q11 connects the anode of diode D16, and the negative electrode of diode D16 connects second end of driving transformer T1 secondary winding T1A.
Suppression resistor is like the control utmost point and the output end of switching tube of 7 connection switching tube Q11.
Inferior polygonal voltage sample circuit comprises the first divider resistance R58 and the second divider resistance R57, the first divider resistance R58 and second divider resistance R57 series connection, the anodal VOUT+ of a termination switching power circuit output of voltage sampling circuit, other end ground connection.Tie point between the first divider resistance R58 and the second divider resistance R57 connects the 1st pin of TL494 chip.
Low the 3rd divider resistance R61 and the 4th divider resistance R56 of comprising of the first reference voltage acquisition cuicuit, the 3rd divider resistance R61 and the 4th divider resistance R56 series connection, the 14th pin Vref of a termination TL494 chip of the first reference voltage acquisition cuicuit, other end ground connection.The 2nd pin of TL494 chip connects the tie point between the 3rd divider resistance R61 and the 4th divider resistance R56 through resistance R 68; The reference voltage V ref of TL494 chip the 14th pin is through the 3rd divider resistance and the 4th divider resistance voltage after partial, as the reference voltage of the 2nd pin.
Inferior limit current sampling circuit comprises current sampling resistor R43 and R44.The output negative busbar of switching power circuit is ground connection between rectification circuit and output VOUT-, current sampling resistor R43 and R44 and connect after be connected between the earth point and output VOUT-of output negative busbar of switching power circuit.The 16th pin of TL494 chip meets the output VOUT of switching power circuit output negative busbar through resistance R 65.
The second reference voltage acquisition cuicuit comprises adjustable divider resistance VR, R80 and the 5th divider resistance R64, R81; Resistance VR, R80 and connect the back and and connect after resistance R 64, R81 series connection; The 14th pin Vref of one termination TL494 chip of the second reference voltage acquisition cuicuit, other end ground connection.
The 15th pin of TL494 chip connects the tie point between adjustable divider resistance VR, R80 and the 5th divider resistance R64, the R81 through resistance R 63; The reference voltage V ref of TL494 chip the 14th pin is through adjustable divider resistance VR, R80 and the 5th divider resistance R64, R81 voltage after partial; As the reference voltage of the 15th pin, the 16th pin ground connection of TL494 chip.
LED lamp switch power circuit embodiment of the present invention is placed on TL494 (U5) secondary; 13,14 pin are connected together to recommending the way of output; Connect the elementary full bridge driving circuit of switching tube drive circuit through 8 pin and 11 pin; Drive elementary 2 MOS switching tube Q9 and Q11 through driving transformer T1 again, so just do not need optocoupler to drive.MOS switching tube Q9 and Q11 receive HF switch half-bridge transformer T2; MOS switching tube Q9 and Q11 transfer direct current to the dither direct current; Deliver to HF switch half-bridge transformer T2 step-down again; Through high frequency half bridge transformer T2 with voltage transitions behind secondary 2 Schottky diodes (Q6, Q7) rectifying and wave-filtering, obtain the required low-voltage DC of LED lamp.
Because of the LED bulkhead lamp capable needs constant voltage and constant current; The anodal VOUT+ of low-voltage DC that the LED lamp is required receives 1 pin (in-phase input end of chip internal error comparison amplifier I) of TL494 (U5) after through divider resistance R57 and R58 dividing potential drop; 2 pin (inverting input of chip internal error comparison amplifier I) are received 14 pin reference voltages (5V) through resistance R 56 and R61 voltage after partial; Be used as the reference voltage of 2 pin, 1 pin is compared with 2 pin, adjusts in 3 pin internal control pulsewidths (PWM); Voltage is under control, has realized the constant voltage effect.
Constant current control is to realize through 15,16 pin (anti-phase and the in-phase input end of chip internal error comparison amplifier II); 15 pin are received 14 pin reference voltages (5V) through R64, R80, R81 and adjustable resistance VR voltage after partial, are used as the reference voltage of 15 pin.Compare with 15 pin in order 16 pin to be detected voltage; Be connected in series copper-manganese resistance (R43, R44) at the required low-voltage DC negative pole of output LED lamp; Produce voltage drop when electric current flows through copper-manganese resistance (R43, R44), 16 pin are received in the voltage drop that produces compared, control the pulsewidth adjustment in 3 pin inside too with 15 pin; Be under control with regard to the electric current that makes circuit output like this, realized the constant current effect.
Claims (10)
1. the control method of a LED lamp switch power circuit is characterized in that, by a control circuit for pulse-width modulation drive circuit of the former limit of LED lamp switch power circuit contactor pipe is carried out pulse width control, and constant voltage, constant current control are carried out in the output of secondary circuit.
2. LED lamp switch power circuit; Comprise former limit circuit and secondary circuit; Described former limit circuit comprises switching tube and switching tube drive circuit; Described secondary circuit comprises the output of rectification circuit and switching power circuit, it is characterized in that, comprises control circuit for pulse-width modulation, inferior limit current sampling circuit and inferior limit output voltage sampling circuit; Described switching tube drive circuit connects the pwm control signal output of control circuit for pulse-width modulation, the current signal input of inferior limit current sampling circuit current sampling signal output termination control circuit for pulse-width modulation; The voltage signal input of the voltage sampling signal output termination control circuit for pulse-width modulation of inferior polygonal voltage sample circuit.
3. LED lamp switch power circuit according to claim 2; It is characterized in that; Described control circuit for pulse-width modulation is the TL494 chip; Described switching tube drive circuit comprises elementary full bridge driving circuit, secondary drive circuit and driving transformer, and elementary full bridge driving circuit and secondary drive circuit are through the driving transformer coupling; The 8th pin and the 11st pin of the input termination TL494 chip of elementary full bridge driving circuit, the 14th pin of TL494 chip connects the 13rd pin, and the 8th pin and the 11st pin of TL494 chip are exported with push pull mode; The control utmost point of the output termination switching tube of secondary drive circuit.
4. LED lamp switch power circuit according to claim 3; It is characterized in that; Described elementary full bridge driving circuit comprises the former limit winding of said driving transformer, a NPN triode, the 2nd NPN triode, a PNP triode, the 2nd PNP triode, first base resistance and second base resistance; The collector electrode of the one NPN triode and the 2nd NPN triode connects the energization pins of chip, the grounded collector of a PNP triode and the 2nd PNP triode; The base stage of the one NPN triode connects the base stage of a PNP triode, and connects 8 pin of TL494 chip; The base stage of the 2nd NPN triode connects the base stage of the 2nd PNP triode, and connects 11 pin of TL494 chip; The emitter of the one NPN triode connects the emitter of a PNP triode, and the emitter of the 2nd NPN triode connects the emitter of the 2nd PNP triode; First base resistance connects the base stage of a NPN triode and the energization pins of chip, and second base resistance connects the base stage of the 2nd NPN triode and the energization pins of chip; First termination the one NPN triode of the former limit of transformer winding and the emitter of a PNP triode, second termination the 2nd NPN triode of the former limit of transformer winding and the emitter of a PNP triode.
5. LED lamp switch power circuit according to claim 4; It is characterized in that; Described elementary full bridge driving circuit comprises first fly-wheel diode, second fly-wheel diode, the 3rd fly-wheel diode and the 4th fly-wheel diode; The plus earth of first fly-wheel diode and second fly-wheel diode, the negative electrode of the 3rd fly-wheel diode and the 4th fly-wheel diode connects the energization pins of chip; The anode of the negative electrode of first fly-wheel diode and the 3rd fly-wheel diode connects first end of the former limit of transformer winding, and the anode of the negative electrode of second fly-wheel diode and the 4th fly-wheel diode connects second end of the former limit of transformer winding.
6. LED lamp switch power circuit according to claim 4; It is characterized in that; Described elementary full bridge driving circuit comprises capacitance, and described capacitance is serially connected between first end and the NPN transistor emitter of the former limit of transformer winding or between second end and the 2nd NPN transistor emitter of the former limit of transformer winding.
7. LED lamp switch power circuit according to claim 2; It is characterized in that; Described secondary drive circuit comprises secondary winding, PNP triode, forward drive resistance, first diode and second diode of said driving transformer; The collector electrode of PNP triode connects the control utmost point of said switching tube and the negative electrode of first diode, and the anode of first diode connects first end of forward drive resistance; First end of the second termination driving transformer secondary winding of forward drive resistance, the second termination output end of switching tube of driving transformer secondary winding; The base stage of PNP triode connects the anode of first diode, and the collector electrode of PNP triode connects the anode of second diode, and the negative electrode of second diode connects second end of driving transformer secondary winding.
8. LED lamp switch power circuit according to claim 7 is characterized in that described secondary drive circuit comprises suppression resistor, and described suppression resistor connects the control utmost point and the output end of switching tube of switching tube.
9. LED lamp switch power circuit according to claim 3; It is characterized in that; Comprise the first reference voltage acquisition cuicuit, inferior polygonal voltage sample circuit comprises first divider resistance and second divider resistance, first divider resistance and the series connection of second divider resistance; The positive pole of one termination switching power circuit output of voltage sampling circuit, other end ground connection; Tie point between first divider resistance and second divider resistance connects the 1st pin of TL494 chip; The described first reference voltage acquisition cuicuit comprises the 3rd divider resistance and the 4th divider resistance, the 3rd divider resistance and the series connection of the 4th divider resistance, the 14th pin of a termination TL494 chip of the first reference voltage acquisition cuicuit, other end ground connection; The 2nd pin of TL494 chip connects the tie point between the 3rd divider resistance and the 4th divider resistance, and the reference voltage of TL494 chip the 14th pin is through the 3rd divider resistance and the 4th divider resistance voltage after partial, as the reference voltage of the 2nd pin.
10. LED lamp switch power circuit according to claim 3 is characterized in that, comprises the second reference voltage acquisition cuicuit, and inferior limit current sampling circuit comprises current sampling resistor; The output negative busbar of switching power circuit ground connection between rectification circuit and output; Described current sampling resistor is serially connected between the output negative busbar earth point and output of switching power circuit, and the 16th pin of TL494 chip connects the output of the output negative busbar of switching power circuit; The second reference voltage acquisition cuicuit comprises adjustable divider resistance and the 5th divider resistance, adjustable divider resistance and the series connection of the 5th divider resistance, the 4th pin of a termination TL494 chip of the second reference voltage acquisition cuicuit, other end ground connection; The 15th pin of TL494 chip connects the tie point between adjustable divider resistance and the 5th divider resistance, and the reference voltage of TL494 chip the 14th pin is through adjustable divider resistance and the 5th divider resistance voltage after partial, as the reference voltage of the 15th pin.
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| CN107040143A (en) * | 2017-06-12 | 2017-08-11 | 湖南晟和电子技术有限公司 | Power circuit, method of supplying power to and its measuring instrument being made |
| CN109067189A (en) * | 2018-09-27 | 2018-12-21 | 标格达精密仪器（广州）有限公司 | Numerical control switch power supply with external arithmetic feedback |
| CN110247543A (en) * | 2019-06-21 | 2019-09-17 | 秦皇岛尼特智能科技有限公司 | Circuit for enhancing immunity to conducted disturbance in fire-fighting bus |
| US10741107B2 (en) | 2013-12-31 | 2020-08-11 | Ultravision Technologies, Llc | Modular display panel |
| US10891881B2 (en) | 2012-07-30 | 2021-01-12 | Ultravision Technologies, Llc | Lighting assembly with LEDs and optical elements |
| CN113054922A (en) * | 2021-02-24 | 2021-06-29 | 浙江宝狮电子有限公司 | Drive circuit for driving square transformer |
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| CN107040143B (en) * | 2017-06-12 | 2023-08-08 | 湖南晟和电源科技有限公司 | Power supply circuit, power supply method and metering instrument manufactured by same |
| CN109067189A (en) * | 2018-09-27 | 2018-12-21 | 标格达精密仪器（广州）有限公司 | Numerical control switch power supply with external arithmetic feedback |
| CN110247543A (en) * | 2019-06-21 | 2019-09-17 | 秦皇岛尼特智能科技有限公司 | Circuit for enhancing immunity to conducted disturbance in fire-fighting bus |
| CN113054922A (en) * | 2021-02-24 | 2021-06-29 | 浙江宝狮电子有限公司 | Drive circuit for driving square transformer |
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