CN103151829B - Two-channel direct-current (DC) output waterproof constant current power supply - Google Patents
Two-channel direct-current (DC) output waterproof constant current power supply Download PDFInfo
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- CN103151829B CN103151829B CN201310077392.7A CN201310077392A CN103151829B CN 103151829 B CN103151829 B CN 103151829B CN 201310077392 A CN201310077392 A CN 201310077392A CN 103151829 B CN103151829 B CN 103151829B
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- 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
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Abstract
The invention relates to a two-channel direct-current (DC) output waterproof constant current power supply, which comprises a first output channel formed by an input rectification filter circuit, a power conversion circuit, a pulse-width modulation (PWM) master controller, a voltage feedback circuit, an output rectification filter circuit. The two-channel DC output waterproof constant current power supply also comprises a second output channel formed by a current-limiting and voltage-reducing circuit, a commutating and voltage-stabilizing circuit and an intelligent transfer switch circuit, wherein the current-limiting and voltage-reducing circuit is used for converting high alternating current input voltage into second low-voltage alternating current for output, and limiting current of which the current value is greater than a rated value to pass; the input end of the commutating and voltage-stabilizing circuit is connected with the output end of the current-limiting and voltage-reducing circuit; the commutating and voltage-stabilizing circuit is used for performing commutation on the second low-voltage alternating current to output second low-voltage direct current, and stabilizing the output second low-voltage direct current within a specialized range; and the intelligent transfer switch circuit is used for judging whether the second low-voltage direct current output by the commutating and voltage-stabilizing circuit is output or not according to the first low-voltage direct current output by the first output channel. The two-channel DC output waterproof constant current power supply provided by the invention is stable in output power and long in service life and is safe and reliable.
Description
Technical field
The present invention relates to power circuit field, particularly relate to a kind of binary channels DC and export waterproof constant-current supply.
Background technology
The effect of constant-current supply alternating current is converted to direct current for LED lamp.The constant-current supply of prior art comprises EMI circuit, input rectifying, filter circuit, power conversion circuit, export rectification, filter circuit, circuit of power factor correction, PWM master controller, output circuit, this power supply advantage is energy-conservation, work conversion efficiency is high, and containing various kinds of protective circuit devices such as overcurrent-overvoltages, its Problems existing is: be afraid of to make moist into water, the core of the excessive easy damage Switching Power Supply of immediate current, thus cause power supply no-output or output voltage instability, and this power supply only has single channel output channel, once the core of Switching Power Supply is damaged, LED just cannot normally work.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provide a kind of stable output power, binary channels DC that is safe and reliable, long service life exports waterproof constant-current supply, and this power supply also has water-proof function.
The present invention is achieved in that a kind of binary channels DC exports waterproof constant-current supply, comprise input rectifying filter circuit, power conversion circuit, PWM master controller, voltage feedback circuit, output rectifier and filter, described input rectifying filter circuit the AC-input voltage of high pressure is carried out rectification and filtering formation high voltage direct current passes to PWM master controller and power conversion circuit, high voltage direct current turns on and off by PWM master controller, export high-frequency pulse voltage and pass to power conversion circuit, high-frequency pulse voltage is transformed to the first low-voltage alternating-current and passes to output rectifier and filter by power conversion circuit, described output rectifier and filter the first low-voltage alternating-current is carried out rectification and filtering forms the first low-voltage direct output, form the first output channel, the output rectifier and filter output voltage error signal of telecommunication of detection is fed back to PWM master controller by described voltage feedback circuit, by PWM master controller, output voltage is adjusted accurately, output voltage is made to keep constant, this power supply also comprises current limliting reduction voltage circuit, regulator rectifier circuit and intelligent switching switch circuit, the input of described current limliting reduction voltage circuit is connected with the input of input rectifying filter circuit, export for the AC-input voltage of high pressure being transformed to the second low-voltage alternating-current, and the electric current limited higher than rated value passes through, the input of described regulator rectifier circuit is connected with the output of current limliting reduction voltage circuit, the second low-voltage direct is exported for the second low-voltage alternating-current is carried out rectification, and the second low-voltage direct is stabilized in prescribed limit, described intelligent switching switch circuit is used for the first low-voltage direct exported according to the first output channel, judge whether that the second low-voltage direct exported by regulator rectifier circuit exports, form the second output channel.
This power supply also comprises lightning protection unit, EMI circuit, and the input of described lightning protection unit is connected with ac input end, and the output of lightning protection unit is connected with the input of EMI circuit, and the output of described EMI circuit is connected with the input of input rectifying filter circuit.
Described lightning protection unit comprises the first lightning protection discharge tube D1, second lightning protection discharge tube D2, first piezo-resistance ZT1, second piezo-resistance ZT2, 3rd piezo-resistance ZT3, fuse F1, described first lightning protection discharge tube D1 one end connects alternating current input L end, the first lightning protection discharge tube D1 other end connects one end of the first piezo-resistance ZT1, the other end of the first piezo-resistance ZT1 connects publicly, described second lightning protection discharge tube D2 one end connects alternating current input N end, the second lightning protection discharge tube D2 other end connects one end of the second piezo-resistance ZT2, the other end of the second piezo-resistance ZT2 connects publicly, one end of fuse F1 connects alternating current input L end, the other end of fuse F1 connects one end of the 3rd piezo-resistance ZT3, the other end of the 3rd piezo-resistance ZT3 connects alternating current input N end, the two ends of the 3rd piezo-resistance ZT3 are connected with EMI circuit input end.
Circuit of power factor correction is connected with between described input rectifying filter circuit and power conversion circuit.
Described voltage feedback circuit comprises sample resistance, three terminal regulator and photoelectrical coupler, after the voltage signal that output rectifier and filter exports samples by described sample resistance, after comparing with three terminal regulator internal reference voltage source, output error current signal, by the control end of photoelectrical coupler input PWM master controller, direct control output duty cycle, obtains burning voltage and exports.
Open loop protection circuit is connected with between described sample resistance and three terminal regulator; described open loop protection circuit comprises the voltage-reference U1 be connected with described sample resistance, the switching circuit be connected with described voltage-reference U1; described switching circuit is connected with described three terminal regulator, and described switching circuit adopts model to be the integrated circuit modules of LM158.
Described PWM master controller employing model is the Switching Power Supply control chip of TEA1751T.
Described current limliting reduction voltage circuit comprises the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, first resistance R1 is in parallel with the first electric capacity C1, second resistance R2 is in parallel with the second electric capacity C2, first electric capacity C1 one end connects alternating current input L end, the other end connects the first input end of regulator rectifier circuit, second electric capacity C2 one end connects alternating current input N end, and the other end connects the second input of regulator rectifier circuit.
Described regulator rectifier circuit comprises rectifier bridge stack B1, Voltage stabilizing module U1, the first input end of described rectifier bridge stack B1 is connected with current limliting reduction voltage circuit first output, rectifier bridge stack B1 second input is connected with current limliting reduction voltage circuit second output, first output of rectifier bridge stack B1 is connected with the input of Voltage stabilizing module U1, second output head grounding of rectifier bridge stack B1, the output of Voltage stabilizing module U1 is connected with intelligent switching switch circuit, the common end grounding of Voltage stabilizing module U1.
Described intelligent switching switch circuit comprises relay K, the 3rd resistance R3, diode VD1, relay coil one end ground connection, the other end is connected with the negative pole of the 3rd resistance R3 one end, diode VD1 respectively, the other end of the 3rd resistance R3 is connected with the cathode output end of the first output channel output circuit, the plus earth of diode VD1, normally-closed contact one end of relay K is connected with the output of the second output channel current rectifying and wave filtering circuit, and the other end is connected with the cathode output end of the first output channel output circuit.
After adopting technique scheme, the present invention compared with prior art, have the following advantages: binary channels DC of the present invention exports the first output channel that waterproof constant-current supply not only comprises prior art, also comprise current limliting reduction voltage circuit, second output channel of regulator rectifier circuit and intelligent switching switch circuit composition, even if the core of the first output channel of the present invention is damaged, and Non voltage output or voltage export on the low side, intelligence diverter switch can activate now the second output channel, also can the direct voltage of stable output be powered to LED by second output channel the present invention, not only serve emergent effect, and extend the useful life of Switching Power Supply.
Again because the current limliting reduction voltage circuit of the second output channel adopts CBB capacitance decompression, CBB the electric capacity outsourcing of flame retardant glue band and epoxy sealing, without the need to doing waterproof work, even entered water because of the rainy day also do not affect normal direct voltage output.
The present invention includes lightning protection unit, the impact of customer service moment surge current and power supply can not be burnt, be used for the circuit part of protection switch power supply.
The present invention includes EMI circuit, can electromagnetic interference be reduced.
The present invention includes power factor control circuit, voltage feedback circuit, open loop protection circuit, make the present invention energy-conservation, work conversion efficiency high, stable output power, safe and reliable.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is schematic diagram of the present invention;
Fig. 3 is circuit diagram of the present invention.
Wherein, 1 is lightning protection unit, and 2 is EMI circuit; 3 is input rectifying filter circuit, and 4 is circuit of power factor correction, and 5 is main PWM controller; 6 is power conversion circuit; 7 is output rectifier and filter, and 8 is output circuit, and 9 is voltage feedback circuit; 10 is open loop protection circuit; 11 is current limliting reduction voltage circuit, and 12 is regulator rectifier circuit, and 13 is intelligent switching switch circuit.
Embodiment
See Fig. 1 and Fig. 2, a kind of binary channels DC exports waterproof constant-current supply, comprise input rectifying filter circuit 3, power conversion circuit 6, PWM master controller 5, voltage feedback circuit 9, output rectifier and filter 7, preferably, this power supply also comprises lightning protection unit 1, EMI circuit 2, the input of described lightning protection unit 1 is connected with ac input end, the output of lightning protection unit 1 is connected with the input of EMI circuit 2, the output of described EMI circuit 2 is connected with the input of input rectifying filter circuit 3, described input rectifying filter circuit 3 AC-input voltage of high pressure is carried out rectification and filtering formation high voltage direct current passes to PWM master controller 5 and power conversion circuit 6, circuit of power factor correction 4 is connected with between described input rectifying filter circuit 3 and power conversion circuit 6, the circuit of power factor correction 4 of the present embodiment is controlled by PWM master controller 5, certainly, circuit of power factor correction also can be controlled by independent pfc controller.High voltage direct current turns on and off by described PWM master controller 5, export high-frequency pulse voltage and pass to power conversion circuit 6, high-frequency pulse voltage is transformed to the first low-voltage alternating-current and passes to output rectifier and filter 7 by power conversion circuit 6, described output rectifier and filter 7 first low-voltage alternating-current is carried out rectification and filtering forms the first low-voltage direct output, form the first output channel, preferably, described output rectifier and filter 7 output is connected with output circuit 8.The output circuit output voltage error signal of telecommunication of detection is fed back to PWM master controller 5 by described voltage feedback circuit 9, adjusted accurately by PWM master controller 5 pairs of output voltages, output voltage is made to keep constant, this power supply also comprises current limliting reduction voltage circuit 11, regulator rectifier circuit 12 and intelligent switching switch circuit 13, the input of described current limliting reduction voltage circuit 11 is connected with the input of input rectifying filter circuit 3, export for the AC-input voltage of high pressure being transformed to the second low-voltage alternating-current, and the electric current limited higher than rated value passes through, certainly, the input of described current limliting reduction voltage circuit 11 also can connect the output of ac input end or lightning protection unit, the input of current limliting reduction voltage circuit of the present embodiment is connected with the output of lightning protection unit.The input of described regulator rectifier circuit 12 is connected with the output of current limliting reduction voltage circuit 11, the second low-voltage direct is exported for the second low-voltage alternating-current is carried out rectification, and the second low-voltage direct is stabilized in prescribed limit, first low-voltage direct of described intelligent switching switch circuit 13 for exporting according to the first output channel, judge whether that the second low-voltage direct exported by regulator rectifier circuit exports, form the second output channel.Open loop protection circuit 10 is provided with between described output circuit 8 and PWM master controller 5.
See Fig. 3, described lightning protection unit comprises the first lightning protection discharge tube D1, second lightning protection discharge tube D2, first piezo-resistance ZT1, second piezo-resistance ZT2, 3rd piezo-resistance ZT3, fuse F1, described first lightning protection discharge tube D1 one end connects alternating current input L end, the first lightning protection discharge tube D1 other end connects one end of the first piezo-resistance ZT1, the other end of the first piezo-resistance ZT1 connects publicly, described second lightning protection discharge tube D2 one end connects alternating current input N end, the second lightning protection discharge tube D2 other end connects one end of the second piezo-resistance ZT2, the other end of the second piezo-resistance ZT2 connects publicly, one end of fuse F1 connects alternating current input L end, the other end of fuse F1 connects one end of the 3rd piezo-resistance ZT3, the other end of the 3rd piezo-resistance ZT3 connects alternating current input N end, the two ends of the 3rd piezo-resistance ZT3 are connected with EMI circuit input end.
See Fig. 3, EMI circuit comprises common mode inductance LX1, common mode inductance LX2, electric capacity CX1, resistance R4, resistance R5, two inputs of common mode inductance LX1 are connected with two outputs of lightning protection unit, two outputs are connected with the two ends of electric capacity CX1, resistance R4 is connected in parallel on the two ends of electric capacity CX1 after connecting with resistance R5, two inputs of common mode inductance LX2 are connected with two outputs of common mode inductance L X1 respectively, and two outputs of common mode inductance LX2 are connected with two inputs of input rectifying filter circuit.
See Fig. 3, input rectifying filter circuit comprises bridge rectifier B2, inductance L 1, electric capacity C3, inductance L 1, electric capacity C3 form LC filter circuit, wherein, two inputs of bridge rectifier B2 are connected with two outputs of EMI circuit, first output head grounding of bridge rectifier B2, and the two ends of electric capacity C3 are connected with two outputs of bridge rectifier B2, inductance L 1 one end is connected with second output of bridge rectifier B2, and the other end is connected with the input of circuit of power factor correction.
See Fig. 3, described circuit of power factor correction comprises inductance coil T1, switching tube Q1, rectifier diode VD2, output filter capacitor C4, and by PWM main controller controls, it turns on and off described switching tube Q1.Two inputs of described inductance coil T1 are connected with two outputs of input rectifying filter circuit, first output of inductance coil T1 and the drain electrode of switching tube Q1, rectifier diode VD2 positive pole connects, rectifier diode VD2 negative pole and output filter capacitor C4 positive pole, the input of power conversion circuit connects, output filter capacitor C4 minus earth, described PWM master controller is by the detection limit of voltage and current, the high-frequency drive pulse produced through simulation trial, come conducting and the shutoff of control switch pipe Q1, thus control flow check is through the electric current of inductance coil T1, the waveform of AC power input current and phase place is forced all to reach unanimity with the waveform of input voltage and phase place, power factor is very significantly improved.
See Fig. 3, power conversion circuit comprises high frequency transformer T2, switching tube Q2, one end of high frequency transformer T2 armature winding is connected with the drain electrode of switching tube Q2, the other end is connected with the output of circuit of power factor correction, RC current rectifying and wave filtering circuit is connected with between one end of high frequency transformer T2 armature winding and the other end, RC current rectifying and wave filtering circuit comprises diode VD3, electric capacity C5, resistance R7, R8, R9, diode VD3 and electric capacity C5 is connected on the two ends of high frequency transformer T2 armature winding, resistance R7, R8, in parallel with electric capacity C5 after R9 series connection, the secondary winding of high frequency transformer T2 is connected with the input of output rectifier and filter.
See Fig. 3, described PWM master controller employing model is the Switching Power Supply control chip of TEA1751T.TEA1751T includes the protective circuits such as electric current, voltage, short circuit.Described TEA1751T comprises a power factor controller and a reverse excitation circuit controller.The pin of described TEA1751T is described below: 1 pin of TEA1751T is supply voltage, 2 pin are ground connection, 3 pin are flyback control inputs, 4 pin are the auxiliary winding input carrying out flyback degaussing time and overvoltage protection, 5 pin are general locking protective function input, 6 pin are the frequency compensation pin of PFC, 7 pin are that the sampling of principal voltage detects input, 8 pin are the PFC degaussing time assist winding to input, 9 pin are PFC output voltage sampling input, 10 pin are flyback programmable current sampling input, 11 pin are the programmable current sampling input of PFC, 12 pin are that the MOSFET raster data model of PFC exports, 13 pin are that the MOSFET raster data model that flyback controls exports, 14 pin are high-voltage safety isolation pin, 15 pin do not connect, 16 pin are high voltage startup and the lowest point sampling of flyback portion.
1 pin of described TEA1751T and the auxiliary winding switching of power conversion circuit high frequency transformer T2, for powering to TEA1751T, the diode rectification filter circuit be made up of diode VD9, resistance R14, electric capacity C13, C14 is provided with between the auxiliary winding of high frequency transformer T2 and 1 pin of TEA1751T, wherein, diode VD9, resistance R14 are connected between the auxiliary winding of high frequency transformer T2 and 1 pin of TEA1751T, electric capacity C13, C14 one end connects 1 pin of TEA1751T, other end ground connection.The 2 pin ground connection of TEA1751T.3 pin of TEA1751T are connected with the output of voltage feedback circuit, and for the flyback control inputs of TEA1751T, 3 pin of TEA1751T are by electric capacity C15, C16 ground connection, and electric capacity C15, C16 are in parallel.4 pin of TEA1751T are connected around by resistance R15 with the auxiliary of the high frequency transformer T2 of power conversion circuit, for carrying out the auxiliary winding input of flyback degaussing time and overvoltage protection.5 pin of TEA1751T, by electric capacity C17 ground connection, input for general locking protective function.6 pin of TEA1751T pass through electric capacity C18 in parallel and electric capacity C19 ground connection, for the frequency compensation pin of PFC.7 pin of TEA1751T are connected between the resistance R4 of EMI circuit and resistance R5 by resistance R16, and 7 pin of TEA1751T are by resistance R17 ground connection, and the sampling for principal voltage detects input, and resistance R17 two ends are parallel with electric capacity C20.8 pin of TEA1751T are connected by resistance R18 with the inductance coil T1 of circuit of power factor correction, assist winding to input for the PFC degaussing time.9 pin of TEA1751T are connected by resistance R19, R20 with the output of circuit of power factor correction, and 9 pin of TEA1751T are by resistance R21 ground connection, and for PFC output voltage sampling input, resistance R21 two ends are parallel with electric capacity C21.10 pin of TEA1751T are connected by resistance R22, R23 with the source electrode of the field effect transistor Q2 of power conversion circuit, resistance R22 and electric capacity C22 is in parallel, the source electrode of the field effect transistor Q2 of power conversion circuit, by resistance R10 ground connection, inputs for the sampling of flyback programmable current.11 pin of TEA1751T are connected by resistance R25, R26 with the source electrode of the field effect transistor Q1 of circuit of power factor correction, resistance R25 and electric capacity C23 is in parallel, the source electrode of the field effect transistor Q1 of circuit of power factor correction is by resistance R6 ground connection, and the programmable current sampling for PFC inputs.12 pin of TEA1751T are connected by resistance R27 with the grid of the field effect transistor Q1 of circuit of power factor correction, and the MOSFET raster data model for PFC exports.13 pin of TEA1751T are connected by resistance R28 with the grid of the field effect transistor Q2 of power conversion circuit, and the MOSFET raster data model controlled for flyback exports.14 pin of TEA1751T are by electric capacity C24 ground connection.15 pin of TEA1751T do not connect.16 pin of TEA1751T are connected by resistance R29 with the armature winding of the high frequency transformer T2 of power conversion circuit, for high voltage startup and the lowest point sampling of flyback portion.
See Fig. 3, output rectifier and filter comprises by five diode VD4, VD5, VD6, VD7, VD8 and two electric capacity C6, the rectification circuit that C7 forms and the filter circuit be made up of two electric capacity C8 and C9, wherein, the negative pole of diode VD4 is connected with the negative pole of diode VD5, the positive pole of diode VD4 is connected with the positive pole of diode VD5, the positive pole of diode VD4 is connected with the first output of power conversion circuit, second output head grounding of power conversion circuit, the negative pole of diode VD4 is by electric capacity C6, diode VD6, VD7, VD8 and electric capacity C7 ground connection, wherein, electric capacity C6, diode VD6 and electric capacity C7 connects successively, the positive pole of diode VD7 is connected with the negative pole of electric capacity C7, the negative pole of diode VD7 is connected with the negative pole of electric capacity C6, the positive pole of diode VD8 is connected with the negative pole of diode VD6, the negative pole of diode VD8 is connected with the negative pole of diode VD4, electric capacity C8, the positive pole of C9 is connected with the negative pole of diode VD4, electric capacity C8, the minus earth of C9.
See Fig. 3, output circuit comprises three electric capacity C10, C11 and C12, two resistance R12, R13 and inductance L 2, one input of inductance L 2 is connected with the output of output rectifier and filter, another input end grounding of inductance L 2, the output of output rectifier and filter is by resistance R12, R13, electric capacity C11 ground connection, wherein, resistance R12, connect with electric capacity C11 after R13 parallel connection, the output of output rectifier and filter is by electric capacity C10 ground connection, two outputs of inductance L 2 respectively with just, cathode output end connects, electric capacity C12 is just connected in parallel on, cathode output end.
See Fig. 3, voltage feedback circuit detects the high frequency switch transformer output voltage error signal of telecommunication and feeds back to switching power source chip, is adjusted accurately output voltage by switching power source chip, makes output voltage keep constant.Described voltage feedback circuit comprises sample resistance, three terminal regulator MCP and photoelectrical coupler, after the voltage signal that output circuit exports samples by described sample resistance, after comparing with three terminal regulator internal reference voltage source, output error current signal, (three terminal regulator inside comprises reference voltage source, error amplifier and type switching transistor driver, be used as the external error amplifier of TEA1751T) by the control end of photoelectrical coupler input PWM master controller, direct control output duty cycle, obtains burning voltage and exports.Open loop protection circuit is connected with between described sample resistance and three terminal regulator; described open loop protection circuit comprises the voltage-reference be connected with described sample resistance, the switching circuit be connected with described voltage-reference; described switching circuit is connected with described three terminal regulator; described switching circuit adopts model to be the integrated circuit modules of LM158; LM158 contains two independently high-gains, frequency-compensated operational amplifier.Described three terminal regulator comprises triode VZ1 and voltage-stabiliser tube ZD1, the negative pole of voltage-stabiliser tube ZD1 is connected with the base stage B of triode VZ1, the plus earth of voltage-stabiliser tube ZD1, the base stage B of triode VZ1 connects the first input end of photoelectrical coupler U4, second input of photoelectrical coupler U4 connects 33V voltage by resistance R30, first output of photoelectrical coupler U4 connects 3 pin of TEA1751T, second output head grounding of photoelectrical coupler U4.
The pin of described LM158 is described as follows: 1 pin is for exporting, and 2 pin are anti-phase input, and 3 pin are non-inverting input, and 4 pin are earth terminal, and 5 pin are noninverting input, and 6 pin are anti-phase input, and 7 pin are for exporting, and 8 pin are supply voltage.
1 pin of described LM158 is connected with the collector electrode C of triode VZ1.2 pin of LM158 are connected by resistance R33 with the output of output circuit, and 2 pin of resistance R33 two ends shunt capacitance C30, LM158 are by resistance R34 ground connection, and 2 pin of LM158 are connected by electric capacity C31 with 1 pin of LM158.3 pin of LM158 are connected by sample resistance R31 with the output of output circuit, and 3 pin of LM158 connect the output of voltage-reference Q3, and the input of voltage-reference Q3 is by electric capacity C25 ground connection.The 4 pin ground connection of LM158.5 pin of LM158 are connected by resistance R35, R36 in parallel with 3 pin of LM158, and 5 pin of LM158 are by resistance R37, R38 ground connection in parallel, and electric capacity C29 is connected in parallel on sample resistance R37 two ends.6 pin of LM158 pass through resistance R39 ground connection, resistance R39 two ends shunt capacitance C28.7 pin of LM158 are connected by electric capacity C27 with 6 pin of LM158, and 7 pin of LM158 are connected with the emitter E of triode VZ1.8 pin of LM158 connect 33V voltage by resistance R31, and electric capacity C26 one end is connected with 8 pin of LM158, other end ground connection, and voltage-stabiliser tube ZD2 is connected in parallel on electric capacity C26 two ends.
See Fig. 3, described current limliting reduction voltage circuit comprises the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, fuse F2, first resistance R1 is in parallel with the first electric capacity C1, second resistance R2 is in parallel with the second electric capacity C2, first electric capacity C1 one end connects alternating current input L end, the other end connects fuse F2 one end, the fuse F2 other end connects the first input end of regulator rectifier circuit, second electric capacity C2 one end connects alternating current input N end, and the other end connects the second input of regulator rectifier circuit.First resistance R1, the second resistance R2 bleeder resistance for providing path of releasing to the first electric capacity C1, the second electric capacity C2, for after quitting work, the electric energy that the first electric capacity C1 that releases, the second electric capacity C2 two ends store.First and second electric capacity can adopt CBB electric capacity.
See Fig. 3, described regulator rectifier circuit comprises rectifier bridge stack B1, Voltage stabilizing module U1, described Voltage stabilizing module U1 is three-port variable voltage regulator LM150/250350, the first input end of described rectifier bridge stack B1 is connected with current limliting reduction voltage circuit first output, rectifier bridge stack B1 second input is connected with current limliting reduction voltage circuit second output, first output of rectifier bridge stack B1 is connected with the input of Voltage stabilizing module U1, second output head grounding of rectifier bridge stack B1, the output of Voltage stabilizing module U1 is connected with intelligent switching switch circuit, the common end grounding of Voltage stabilizing module U1.
See Fig. 3, described intelligent switching switch circuit comprises relay K, the 3rd resistance R3, diode VD1, relay coil one end ground connection, the other end is connected with the negative pole of the 3rd resistance R3 one end, diode VD1 respectively, the other end of the 3rd resistance R3 is connected with the cathode output end of the first output channel output circuit, the plus earth of diode VD1, normally-closed contact one end of relay K is connected with the output of the second output channel current rectifying and wave filtering circuit, and the other end is connected with the cathode output end of the first output channel output circuit.
Referring to figs. 1 through Fig. 3, the course of work of the first output channel is as follows: when external communication electricity input (AC75V ~ 280V) is introduced into ac input end, first by EMI circuit, anti-interference filtration process is carried out to it, then rectifying and wave-filtering is carried out, output dc voltage, pass through circuit of power factor correction again, harmonic component in filtering line current, hf and hv pulse voltage is obtained at the armature winding of power conversion circuit, pass through magnetic Field Coupling, high frequency low voltage pulse voltage is obtained respectively at power conversion circuit secondary winding and auxiliary winding, the induced voltage of secondary winding carries out through output rectifier and filter the direct voltage exporting 33V after rectification and filtering process.Auxiliary winding induced voltage inputs as the auxiliary winding carrying out flyback degaussing time and overvoltage protection and after diode rectification filter circuit, exports direct-current control voltage and powers to PWM master controller.When there is the factors such as input voltage significantly changes, load variations, variations in temperature, the change of output voltage is detected by voltage feedback circuit, control voltage changes, the variable quantity that voltage feedback circuit detects is delivered to PWM master controller trigger pulse width and changes, to ensure the stable of output voltage.
The course of work of the second output channel is as follows: when external communication electricity input (AC75V ~ 280V) is introduced into ac input end, first carries out current limliting step-down process by current limliting reduction voltage circuit to it, then carry out rectification, voltage stabilizing, exports 33V direct voltage.When the first output channel breaks down, and when Non voltage output or voltage export on the low side, the relay coil power-off of intelligent diverter switch, the normally-closed contact of relay K closes, and the second direct voltage output passage starts to power to LED.
Lightning protection unit of the present invention is used for protection switch power circuit part when being and thundering the rainy day.The power conversion circuit of the first direct voltage output passage will do to insulate and carry out waterproof with encapsulating, not so water inlet can burn out the core component of power supply, and the second direct voltage output passage is capacitance decompression, without the need to doing waterproof work, just at last whole for power supply pcb board is thrown into the normal output that also can not affect power supply in water, there is the advantages such as long service life.
Can draw a series of improvement by above description to those skilled in the art, these improvement should be included in the protection range of all dependent claims.The change of three terminal regulator U1 model in power supply; the change of Switching Power Supply control chip U2 model; the change of integrated circuit modules U3 model; the change of photoelectrical coupler U4 model; the change of voltage feedback circuit; the change of high frequency transformer T2, the change of output voltage V+ size, does not depart from the protection range of dependent claims.
Claims (7)
1. a binary channels DC exports waterproof constant-current supply, comprise input rectifying filter circuit, power conversion circuit, PWM master controller, voltage feedback circuit, output rectifier and filter, described input rectifying filter circuit the AC-input voltage of high pressure is carried out rectification and filtering formation high voltage direct current passes to PWM master controller and power conversion circuit, high voltage direct current turns on and off by PWM master controller, export high-frequency pulse voltage and pass to power conversion circuit, high-frequency pulse voltage is transformed to the first low-voltage alternating-current and passes to output rectifier and filter by power conversion circuit, described output rectifier and filter the first low-voltage alternating-current is carried out rectification and filtering forms the first low-voltage direct output, form the first output channel, the output rectifier and filter output voltage error signal of telecommunication of detection is fed back to PWM master controller by described voltage feedback circuit, by PWM master controller, output voltage is adjusted accurately, output voltage is made to keep constant, it is characterized in that: between described input rectifying filter circuit and power conversion circuit, be connected with circuit of power factor correction, open loop protection circuit is provided with between described output circuit and PWM master controller, this power supply also comprises current limliting reduction voltage circuit, regulator rectifier circuit and intelligent switching switch circuit, described current limliting reduction voltage circuit is used for the AC-input voltage of high pressure being transformed to the second low-voltage alternating-current and exports, and the electric current limited higher than rated value passes through, the input of described regulator rectifier circuit is connected with the output of current limliting reduction voltage circuit, the second low-voltage direct is exported for the second low-voltage alternating-current is carried out rectification, and the second low-voltage direct is stabilized in prescribed limit, described intelligent switching switch circuit is used for the first low-voltage direct exported according to the first output channel, judge whether that the second low-voltage direct exported by regulator rectifier circuit exports, form the second output channel,
Described current limliting reduction voltage circuit comprises the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, first resistance R1 is in parallel with the first electric capacity C1, second resistance R2 is in parallel with the second electric capacity C2, first electric capacity C1 one end connects alternating current input L end, the other end connects the first input end of regulator rectifier circuit, second electric capacity C2 one end connects alternating current input N end, and the other end connects the second input of regulator rectifier circuit;
Described intelligent switching switch circuit comprises relay K, the 3rd resistance R3, diode VD1, relay coil one end ground connection, the other end is connected with the negative pole of the 3rd resistance R3 one end, diode VD1 respectively, the other end of the 3rd resistance R3 is connected with the cathode output end of the first output channel output circuit, the plus earth of diode VD1, normally-closed contact one end of relay K is connected with the output of the second output channel current rectifying and wave filtering circuit, and the other end is connected with the cathode output end of the first output channel output circuit.
2. binary channels DC according to claim 1 exports waterproof constant-current supply, it is characterized in that: this power supply also comprises lightning protection unit, EMI circuit, the input of described lightning protection unit is connected with ac input end, the output of lightning protection unit is connected with the input of EMI circuit, and the output of described EMI circuit is connected with the input of input rectifying filter circuit.
3. binary channels DC according to claim 2 exports waterproof constant-current supply, it is characterized in that: described lightning protection unit comprises the first lightning protection discharge tube D1, second lightning protection discharge tube D2, first piezo-resistance ZT1, second piezo-resistance ZT2, 3rd piezo-resistance ZT3, fuse F1, described first lightning protection discharge tube D1 one end connects alternating current input L end, the first lightning protection discharge tube D1 other end connects one end of the first piezo-resistance ZT1, the other end of the first piezo-resistance ZT1 connects publicly, described second lightning protection discharge tube D2 one end connects alternating current input N end, the second lightning protection discharge tube D2 other end connects one end of the second piezo-resistance ZT2, the other end of the second piezo-resistance ZT2 connects publicly, one end of fuse F1 connects alternating current input L end, the other end of fuse F1 connects one end of the 3rd piezo-resistance ZT3, the other end of the 3rd piezo-resistance ZT3 connects alternating current input N end, the two ends of the 3rd piezo-resistance ZT3 are connected with EMI circuit input end.
4. binary channels DC according to claim 1 exports waterproof constant-current supply, it is characterized in that: described voltage feedback circuit comprises sample resistance, three terminal regulator and photoelectrical coupler, after the voltage signal that output rectifier and filter exports samples by described sample resistance, after comparing with three terminal regulator internal reference voltage source, output error current signal, by the control end of photoelectrical coupler input PWM master controller, directly control output duty cycle, obtain burning voltage and export.
5. binary channels DC according to claim 4 exports waterproof constant-current supply; it is characterized in that: between described sample resistance and three terminal regulator, be connected with open loop protection circuit; described open loop protection circuit comprises the voltage-reference U1 be connected with described sample resistance, the switching circuit be connected with described voltage-reference U1; described switching circuit is connected with described three terminal regulator, and described switching circuit adopts model to be the integrated circuit modules of LM158.
6. the binary channels DC according to claim 1 or 4 exports waterproof constant-current supply, it is characterized in that: described PWM master controller employing model is the Switching Power Supply control chip of TEA1751T.
7. binary channels DC according to claim 1 exports waterproof constant-current supply, it is characterized in that: described regulator rectifier circuit comprises rectifier bridge stack B1, Voltage stabilizing module U1, the first input end of described rectifier bridge stack B1 is connected with current limliting reduction voltage circuit first output, rectifier bridge stack B1 second input is connected with current limliting reduction voltage circuit second output, first output of rectifier bridge stack B1 is connected with the input of Voltage stabilizing module U1, second output head grounding of rectifier bridge stack B1, the output of Voltage stabilizing module U1 is connected with intelligent switching switch circuit, the common end grounding of Voltage stabilizing module U1.
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Application publication date: 20130612 Assignee: Chongqing Beibei District Tianli Lamp Co., Ltd. Assignor: Chongqing Jiuyi Photoelectric Instrument Co.,Ltd. Contract record no.: 2015500000007 Denomination of invention: Two-channel direct-current (DC) output waterproof constant current power supply Granted publication date: 20150422 License type: Exclusive License Record date: 20150508 |
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Effective date of registration: 20190131 Address after: 400709 No. 1 Xinmao Road, Beibei District, Chongqing (Free Trade Zone) Patentee after: Chongqing Beibei District Tianli Lamp Co., Ltd. Address before: 400709 No. 8 Wuxing Middle Road, Tongjiaxi Town, Beibei District, Chongqing Patentee before: Chongqing Jiuyi Photoelectric Instrument Co.,Ltd. |
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