CN203119598U - Double-channel direct-current (DC) output waterproof constant current power source - Google Patents
Double-channel direct-current (DC) output waterproof constant current power source Download PDFInfo
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- CN203119598U CN203119598U CN2013201103504U CN201320110350U CN203119598U CN 203119598 U CN203119598 U CN 203119598U CN 2013201103504 U CN2013201103504 U CN 2013201103504U CN 201320110350 U CN201320110350 U CN 201320110350U CN 203119598 U CN203119598 U CN 203119598U
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Abstract
The utility model relates to a double-channel direct-current (DC) output waterproof constant current power source. The double-channel DC output waterproof constant current power source comprises an input rectifying filter circuit, a power transfer circuit, a pulse-width modulation (PWM) master controller, a voltage feedback circuit, and an output rectifying filter circuit, wherein the input rectifying filter circuit, the power transfer circuit, the PWM master controller, the voltage feedback circuit, and the output rectifying filter circuit form a first output channel. The power source further comprises a current limiting voltage reducing circuit, a rectifying voltage regulating circuit and an intelligent switcher circuit, wherein the current limiting voltage reduction circuit is used for enabling a high alternating current input voltage to be converted into a second low-voltage alternating current to be output, and limits passing of current higher than a rated value, an input end of the rectifying voltage regulating circuit is connected with an output end of the current limiting voltage regulating circuit so as to enable the second low-voltage alternating current to be rectified and then enable a second low-voltage direct current to be output, and the second low-voltage direct current is stabilized within a standard range. The intelligent switcher circuit is used for judging whether the second low-voltage direct current output by the rectifying voltage regulator circuit according to a first output channel output by a first low-voltage direct current to form a second output channel. The double-channel DC output waterproof constant current power source is stable in output power, safe, reliable, and long in service life.
Description
Technical field
The utility model relates to the power circuit field, relates in particular to a kind of binary channels DC output waterproof constant-current supply.
Background technology
The effect of constant-current supply is to convert alternating current to direct current to use for the LED lamp.The constant-current supply of prior art comprises the EMI circuit; input rectifying; filter circuit; power conversion circuit; the output rectification; filter circuit; circuit of power factor correction; the PWM master controller; output circuit; this power supply advantage is energy-conservation; work conversion efficiency height; and contain kinds of protect circuit arrangements such as overcurrent-overvoltage; the problem of its existence is: be afraid of to make moist into water; the core of the excessive easy damage Switching Power Supply of immediate current; thereby cause power supply no-output or output voltage instability; and this power supply has only the single channel output channel; in case the core of Switching Power Supply is damaged, the LED lamp just can't operate as normal.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, provides a kind of power output to stablize, and binary channels DC safe and reliable, long service life exports the waterproof constant-current supply, and this power supply also has water-proof function.
The utility model is achieved in that a kind of binary channels DC output waterproof constant-current supply, comprise the input rectifying filter circuit, power conversion circuit, the PWM master controller, voltage feedback circuit, output rectifier and filter, the AC-input voltage of high pressure is carried out rectification with described input rectifying filter circuit and filtering formation high voltage direct current passes to PWM master controller and power conversion circuit, the PWM master controller turns on and off high voltage direct current, the output high-frequency pulse voltage passes to power conversion circuit, power conversion circuit is transformed to first low-voltage alternating-current with high-frequency pulse voltage and passes to output rectifier and filter, first low-voltage alternating-current is carried out rectification to described output rectifier and filter and filtering forms the output of first low-voltage direct, form first output channel, described voltage feedback circuit feeds back to the PWM master controller with the output rectifier and filter output voltage error signal of telecommunication that detects, by the PWM master controller output voltage is adjusted accurately, make output voltage keep constant, this power supply also comprises the 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, be used for the AC-input voltage of high pressure is transformed to the output of second low-voltage alternating-current, and the electric current that restriction is higher than rated value passes through, the input of described regulator rectifier circuit is connected with the output of current limliting reduction voltage circuit, be used for that second low-voltage alternating-current is carried out rectification and export second low-voltage direct, and second low-voltage direct is stabilized in the prescribed limit, described intelligent switching switch circuit is used for first low-voltage direct according to the output of first output channel, judge whether second low-voltage direct output of regulator rectifier circuit output is formed 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, the second lightning protection discharge tube D2, the first piezo-resistance ZT1, the second piezo-resistance ZT2, the 3rd piezo-resistance ZT3, fuse F1, the 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 the end of the first piezo-resistance ZT1, the other end of the first piezo-resistance ZT1 connects publicly, the 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 the end of the second piezo-resistance ZT2, the other end of the second piezo-resistance ZT2 connects publicly, the end of fuse F1 connects alternating current input L end, the other end of fuse F1 connects the end of the 3rd piezo-resistance ZT3, the other end of the 3rd piezo-resistance ZT3 connects alternating current input N end, and the two ends of the 3rd piezo-resistance ZT3 are connected with the EMI circuit input end.
Be connected with circuit of power factor correction between described input rectifying filter circuit and the power conversion circuit.
Described voltage feedback circuit comprises sample resistance, three terminal regulator and photoelectrical coupler, after described sample resistance is taken a sample the voltage signal of output rectifier and filter output, after comparing with three terminal regulator internal reference voltage source, the output error current signal, control end by photoelectrical coupler input PWM master controller, directly the control output duty cycle obtains burning voltage output.
Be connected with open loop protection circuit between described sample resistance and the three terminal regulator; described open loop protection circuit comprises the voltage-reference U1 that is connected with described sample resistance, the switching circuit that is connected with described voltage-reference U1; described switching circuit is connected with described three terminal regulator, and it is the integrated circuit modules of LM158 that described switching circuit adopts model.
It is the Switching Power Supply control chip of TEA1751T that described PWM master controller adopts model.
Described current limliting reduction voltage circuit comprises first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2, first resistance R 1 is in parallel with first capacitor C 1, second resistance R 2 is in parallel with second capacitor C 2, first capacitor C, 1 one ends connect alternating current input L end, the other end connects the first input end of regulator rectifier circuit, second capacitor C, 2 one ends connect alternating current input N end, and the other end connects second input of regulator rectifier circuit.
Described regulator rectifier circuit comprises rectifier bridge heap B1, Voltage stabilizing module U1, the first input end of described rectifier bridge heap B1 is connected with current limliting reduction voltage circuit first output, rectifier bridge heap B1 second input is connected with current limliting reduction voltage circuit second output, first output of rectifier bridge heap B1 is connected with the input of Voltage stabilizing module U1, second output head grounding of rectifier bridge heap 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 R 3, diode VD1, relay coil one end ground connection, the other end is connected with the negative pole of the 3rd resistance R 3 one ends, diode VD1 respectively, the other end of the 3rd resistance R 3 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 utility model compared with prior art, have the following advantages: the utility model binary channels DC output waterproof constant-current supply not only comprises first output channel of prior art, also comprise the current limliting reduction voltage circuit, second output channel that regulator rectifier circuit and intelligent switching switch circuit are formed, even the core of first output channel of the present utility model is damaged, and no-voltage output or voltage output are on the low side, the intelligence diverter switch can activate now second output channel, also can export galvanic current by second output channel the utility model presses to the LED lamp and powers, not only play emergent effect, and prolonged the useful life of Switching Power Supply.
Because the current limliting reduction voltage circuit of second output channel adopts the CBB capacitance decompression, CBB electric capacity need not to do waterproof work with the outsourcing of flame retardant glue band and epoxy sealing again, even also do not influence normal direct voltage output because the rainy day has been advanced water.
The utility model comprises lightning protection unit, customer service the moment surge current impact and can not burn power supply, be used for the circuit part of protection switch power supply.
The utility model comprises the EMI circuit, can reduce electromagnetic interference.
The utility model comprises power factor control circuit, voltage feedback circuit, open loop protection circuit, makes that the utility model is energy-conservation, work conversion efficiency height, and power output is stable, and is safe and reliable.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is schematic diagram of the present utility model;
Fig. 3 is circuit diagram of the present utility model.
Wherein, 1 is lightning protection unit, and 2 is the EMI circuit; 3 is the 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 the current limliting reduction voltage circuit, and 12 is regulator rectifier circuit, and 13 is intelligent switching switch circuit.
Embodiment
Referring to Fig. 1 and Fig. 2, a kind of binary channels DC output 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, the AC-input voltage of high pressure is carried out rectification with described input rectifying filter circuit 3 and filtering formation high voltage direct current passes to PWM master controller 5 and power conversion circuit 6, be connected with circuit of power factor correction 4 between described input rectifying filter circuit 3 and the power conversion circuit 6, the circuit of power factor correction 4 of present embodiment is by 5 controls of PWM master controller, certainly, circuit of power factor correction also can be by independent pfc controller control.Described PWM master controller 5 turns on and off high voltage direct current, the output high-frequency pulse voltage passes to power conversion circuit 6, power conversion circuit 6 is transformed to first low-voltage alternating-current with high-frequency pulse voltage and passes to output rectifier and filter 7, first low-voltage alternating-current is carried out rectification to described output rectifier and filter 7 and filtering forms the output of first low-voltage direct, form first output channel, preferably, described output rectifier and filter 7 outputs are connected with output circuit 8.Described voltage feedback circuit 9 feeds back to PWM master controller 5 with the output circuit output voltage error signal of telecommunication that detects, adjust accurately by 5 pairs of output voltages of PWM master controller, make output voltage 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, be used for the AC-input voltage of high pressure is transformed to the output of second low-voltage alternating-current, and the electric current that restriction is 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, and the input of the current limliting reduction voltage circuit of 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, be used for that second low-voltage alternating-current is carried out rectification and export second low-voltage direct, and second low-voltage direct is stabilized in the prescribed limit, first low-voltage direct that described intelligent switching switch circuit 13 is used for according to the output of first output channel, judge whether second low-voltage direct output of regulator rectifier circuit output is formed second output channel.Be provided with open loop protection circuit 10 between described output circuit 8 and the PWM master controller 5.
Referring to Fig. 3, described lightning protection unit comprises the first lightning protection discharge tube D1, the second lightning protection discharge tube D2, the first piezo-resistance ZT1, the second piezo-resistance ZT2, the 3rd piezo-resistance ZT3, fuse F1, the 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 the end of the first piezo-resistance ZT1, the other end of the first piezo-resistance ZT1 connects publicly, the 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 the end of the second piezo-resistance ZT2, the other end of the second piezo-resistance ZT2 connects publicly, the end of fuse F1 connects alternating current input L end, the other end of fuse F1 connects the end of the 3rd piezo-resistance ZT3, the other end of the 3rd piezo-resistance ZT3 connects alternating current input N end, and the two ends of the 3rd piezo-resistance ZT3 are connected with the EMI circuit input end.
Referring to Fig. 3, the EMI circuit comprises common mode inductance LX1, common mode inductance LX2, capacitor C X1, resistance R 4, resistance R 5, 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 capacitor C X1, resistance R 4 and the two ends that are connected in parallel on capacitor C X1 after resistance R 5 is connected, 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.
Referring to Fig. 3, the input rectifying filter circuit comprises bridge rectifier B2, inductance L 1, capacitor C 3, inductance L 1, capacitor C 3 are formed the 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 capacitor C 3 are connected with two outputs of bridge rectifier B2, inductance L 1 one ends are connected with second output of bridge rectifier B2, and the other end is connected with the input of circuit of power factor correction.
Referring to Fig. 3, described circuit of power factor correction comprises inductance coil T1, switching tube Q1, rectifier diode VD2, output filter capacitor C4, and it turns on and off described switching tube Q1 by the PWM main controller controls.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 is anodal to be connected, 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 that produces through simulation trial, come conducting and the shutoff of control switch pipe Q1, the electric current of inductance coil T1 thereby control is flowed through, force the waveform of AC power input current and phase place all to reach unanimity with waveform and the phase place of input voltage, make power factor obtain very big improvement.
Referring to Fig. 3, power conversion circuit comprises high frequency transformer T2, switching tube Q2, one end of the elementary winding of high frequency transformer T2 is connected with the drain electrode of switching tube Q2, the other end is connected with the output of circuit of power factor correction, be connected with the RC current rectifying and wave filtering circuit between one end of the elementary winding of high frequency transformer T2 and the other end, the RC current rectifying and wave filtering circuit comprises diode VD3, capacitor C 5, resistance R 7, R8, R9, diode VD3 and capacitor C 5 are connected on the two ends of the elementary winding of high frequency transformer T2, resistance R 7, R8, R9 series connection back is in parallel with capacitor C 5, and the secondary winding of high frequency transformer T2 is connected with the input of output rectifier and filter.
Referring to Fig. 3, it is the Switching Power Supply control chip of TEA1751T that described PWM master controller adopts model.TEA1751T includes 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 the anti-control input that swashs; 4 pin are the anti-auxiliary winding input that swashs 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 auxiliary winding input of PFC degaussing time; 9 pin are PFC output voltage sampling input; 10 pin are the anti-programmable current sampling input that swashs, and 11 pin are the programmable current sampling input of PFC, and 12 pin are that the MOSFET grid of PFC drives output; 13 pin are that the anti-MOSFET grid that swashs control drives output; 14 pin are that high-voltage safety is isolated pin, and 15 pin do not connect, and 16 pin are anti-high voltage startup and the lowest point sampling that swashs part.
1 pin of described TEA1751T is connected with the auxiliary winding of power conversion circuit high frequency transformer T2, be used for powering to TEA1751T, be provided with the diode rectification filter circuit of being formed by diode VD9, resistance R 14, capacitor C 13, C14 between the auxiliary winding of high frequency transformer T2 and 1 pin of TEA1751T, wherein, diode VD9, resistance R 14 are connected between 1 pin of the auxiliary winding of high frequency transformer T2 and TEA1751T, capacitor C 13, C14 one end connect 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, are used for the anti-sharp control input of TEA1751T, and 3 pin of TEA1751T are by capacitor C 15, C16 ground connection, capacitor C 15, C16 parallel connection.4 pin of TEA1751T are auxiliary around being connected by resistance R 15 with the high frequency transformer T2's of power conversion circuit, are used for the anti-auxiliary winding input that swashs degaussing time and overvoltage protection.5 pin of TEA1751T are used for general locking protective function input by capacitor C 17 ground connection.6 pin of TEA1751T are used for the frequency compensation pin of PFC by capacitor C 18 and capacitor C 19 ground connection in parallel.7 pin of TEA1751T are connected by resistance R 16 between the resistance R 4 and resistance R 5 of EMI circuit, and 7 pin of TEA1751T are by resistance R 17 ground connection, and the sampling that is used for principal voltage detects input, and resistance R 17 two ends are parallel with capacitor C 20.8 pin of TEA1751T are connected by resistance R 18 with the inductance coil T1 of circuit of power factor correction, are used for the auxiliary winding input of PFC degaussing time.9 pin of TEA1751T are connected by resistance R 19, R20 with the output of circuit of power factor correction, and 9 pin of TEA1751T are used for PFC output voltage sampling input by resistance R 21 ground connection, and resistance R 21 two ends are parallel with capacitor C 21.10 pin of TEA1751T are connected by resistance R 22, R23 with the source electrode of the field effect transistor Q2 of power conversion circuit, resistance R 22 and capacitor C 22 parallel connections, the source electrode of the field effect transistor Q2 of power conversion circuit is used for the anti-programmable current sampling input that swashs by resistance R 10 ground connection.11 pin of TEA1751T are connected by resistance R 25, R26 with the source electrode of the field effect transistor Q1 of circuit of power factor correction, resistance R 25 and capacitor C 23 parallel connections, the source electrode of the field effect transistor Q1 of circuit of power factor correction is used for the programmable current sampling input of PFC by resistance R 6 ground connection.12 pin of TEA1751T are connected by resistance R 27 with the grid of the field effect transistor Q1 of circuit of power factor correction, and the MOSFET grid that is used for PFC drives output.13 pin of TEA1751T are connected by resistance R 28 with the grid of the field effect transistor Q2 of power conversion circuit, are used for the anti-MOSFET grid that swashs control and drive output.14 pin of TEA1751T are by capacitor C 24 ground connection.15 pin of TEA1751T do not connect.16 pin of TEA1751T are connected by resistance R 29 with the elementary winding of the high frequency transformer T2 of power conversion circuit, are used for anti-high voltage startup and the lowest point sampling that swashs part.
Referring to Fig. 3, output rectifier and filter comprises by five diode VD4, VD5, VD6, VD7, VD8 and two capacitor C 6, the rectification circuit that C7 forms and the filter circuit of being formed by two capacitor C 8 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 first output of power conversion circuit, second output head grounding of power conversion circuit, the negative pole of diode VD4 is by capacitor C 6, diode VD6, VD7, VD8 and capacitor C 7 ground connection, wherein, capacitor C 6, diode VD6 and capacitor C 7 are connected successively, the positive pole of diode VD7 is connected with the negative pole of capacitor C 7, the negative pole of diode VD7 is connected with the negative pole of capacitor C 6, 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, capacitor C 8, the positive pole of C9 is connected with the negative pole of diode VD4, capacitor C 8, the minus earth of C9.
Referring to Fig. 3, output circuit comprises three capacitor C 10, C11 and C12, two resistance R 12, 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 R 12, R13, capacitor C 11 ground connection, wherein, connect with capacitor C 11 after resistance R 12, the R13 parallel connection, the output of output rectifier and filter is by capacitor C 10 ground connection, two outputs of inductance L 2 are connected with the positive and negative electrode output respectively, and capacitor C 12 is connected in parallel on the positive and negative electrode output.
Referring to 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, by switching power source chip output voltage is adjusted accurately, makes output voltage keep constant.Described voltage feedback circuit comprises sample resistance, three terminal regulator MCP and photoelectrical coupler, after described sample resistance is taken a sample the voltage signal of output circuit output, after comparing with three terminal regulator internal reference voltage source, the 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) control end by photoelectrical coupler input PWM master controller, directly the control output duty cycle obtains burning voltage output.Be connected with open loop protection circuit between described sample resistance and the three terminal regulator; described open loop protection circuit comprises the voltage-reference that is connected with described sample resistance, the switching circuit that is connected with described voltage-reference; described switching circuit is connected with described three terminal regulator; it is the integrated circuit modules of LM158 that described switching circuit adopts model; LM158 has comprised 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 R 30, 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 output, 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 output, 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 R 33 with the output of output circuit, resistance R 33 two ends shunt capacitance C30, and 2 pin of LM158 are by resistance R 34 ground connection, and 2 pin of LM158 are connected by capacitor C 31 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 capacitor C 25 ground connection.The 4 pin ground connection of LM158.5 pin of LM158 are connected by parallel resistor R35, R36 with 3 pin of LM158, and 5 pin of LM158 are by parallel resistor R37, R38 ground connection, and capacitor C 29 is connected in parallel on sample resistance R37 two ends.6 pin of LM158 are by resistance R 39 ground connection, resistance R 39 two ends shunt capacitance C28.7 pin of LM158 are connected by capacitor C 27 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 R 31, and capacitor C 26 1 ends are connected with 8 pin of LM158, other end ground connection, and voltage-stabiliser tube ZD2 is connected in parallel on capacitor C 26 two ends.
Referring to Fig. 3, described current limliting reduction voltage circuit comprises first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2, fuse F2, first resistance R 1 is in parallel with first capacitor C 1, second resistance R 2 is in parallel with second capacitor C 2, first capacitor C, 1 one ends connect 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 capacitor C, 2 one ends connect alternating current input N end, and the other end connects second input of regulator rectifier circuit.First resistance R 1, the bleeder resistance of second resistance R 2 for the path of releasing being provided for first capacitor C 1, second capacitor C 2 are used for after quitting work first capacitor C 1 of releasing, second capacitor C, 2 two ends electric energy stored.First and second electric capacity can adopt CBB electric capacity.
Referring to Fig. 3, described regulator rectifier circuit comprises rectifier bridge heap 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 heap B1 is connected with current limliting reduction voltage circuit first output, rectifier bridge heap B1 second input is connected with current limliting reduction voltage circuit second output, first output of rectifier bridge heap B1 is connected with the input of Voltage stabilizing module U1, second output head grounding of rectifier bridge heap B1, the output of Voltage stabilizing module U1 is connected with intelligent switching switch circuit, the common end grounding of Voltage stabilizing module U1.
Referring to Fig. 3, described intelligent switching switch circuit comprises relay K, the 3rd resistance R 3, diode VD1, relay coil one end ground connection, the other end is connected with the negative pole of the 3rd resistance R 3 one ends, diode VD1 respectively, the other end of the 3rd resistance R 3 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 first output channel is as follows: (AC75V～280V) is introduced into ac input end when external communication electricity input, at first by the EMI circuit it being carried out anti-interference filtration handles, carry out rectifying and wave-filtering then, output dc voltage, pass through circuit of power factor correction again, harmonic component in the filtering line current, elementary winding at power conversion circuit obtains hf and hv pulse voltage, be coupled by magnetic field, obtain the high frequency low voltage pulse voltage respectively at power conversion circuit secondary winding and auxiliary winding, the direct voltage of the induced voltage of secondary winding output 33V after output rectifier and filter carries out rectification and filtering processing.Auxiliary winding induced voltage swashs the auxiliary winding input of degaussing time and overvoltage protection and exports direct-current control voltage to the power supply of PWM master controller behind the diode rectification filter circuit as counter.When factors such as input voltage variation significantly, load variations, variations in temperature occurring, detect the change of output voltage 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 guarantee the stable of output voltage.
The course of work of second output channel is as follows: (AC75V～280V) be introduced into ac input end at first carries out the current limliting step-down by the current limliting reduction voltage circuit to it and handles, and carries out rectification, voltage stabilizing then, output 33V direct voltage when the input of external communication electricity.When first output channel breaks down, and no-voltage output or voltage are exported when on the low side, the relay coil outage of intelligent diverter switch, and the normally-closed contact closure of relay K, the second direct voltage output channel begin to power to the LED lamp.
Lightning protection unit of the present utility model is to be used for protection switch power circuit part when thundering the rainy day.The power conversion circuit of the first direct voltage output channel will be done insulation and come waterproof with encapsulating, not so water inlet can burn out the core component of power supply, and the second direct voltage output channel is capacitance decompression, need not to do waterproof work, just at last the whole pcb board of power supply is thrown into the normal output that also can not influence power supply in the water, have 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 the 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 break away from the protection range of dependent claims.
Claims (10)
1. a binary channels DC exports the waterproof constant-current supply, comprise the input rectifying filter circuit, power conversion circuit, the PWM master controller, voltage feedback circuit, output rectifier and filter, the AC-input voltage of high pressure is carried out rectification with described input rectifying filter circuit and filtering formation high voltage direct current passes to PWM master controller and power conversion circuit, the PWM master controller turns on and off high voltage direct current, the output high-frequency pulse voltage passes to power conversion circuit, power conversion circuit is transformed to first low-voltage alternating-current with high-frequency pulse voltage and passes to output rectifier and filter, first low-voltage alternating-current is carried out rectification to described output rectifier and filter and filtering forms the output of first low-voltage direct, form first output channel, described voltage feedback circuit feeds back to the PWM master controller with the output rectifier and filter output voltage error signal of telecommunication that detects, by the PWM master controller output voltage is adjusted accurately, make output voltage keep constant, it is characterized in that: this power supply also comprises the 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 is transformed to the output of second low-voltage alternating-current, and the electric current that restriction is higher than rated value passes through, the input of described regulator rectifier circuit is connected with the output of current limliting reduction voltage circuit, be used for that second low-voltage alternating-current is carried out rectification and export second low-voltage direct, and second low-voltage direct is stabilized in the prescribed limit, described intelligent switching switch circuit is used for first low-voltage direct according to the output of first output channel, judge whether second low-voltage direct output of regulator rectifier circuit output is formed second output channel.
2. binary channels DC according to claim 1 exports the 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 the waterproof constant-current supply, it is characterized in that: described lightning protection unit comprises the first lightning protection discharge tube D1, the second lightning protection discharge tube D2, the first piezo-resistance ZT1, the second piezo-resistance ZT2, the 3rd piezo-resistance ZT3, fuse F1, the 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 the end of the first piezo-resistance ZT1, the other end of the first piezo-resistance ZT1 connects publicly, the 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 the end of the second piezo-resistance ZT2, the other end of the second piezo-resistance ZT2 connects publicly, the end of fuse F1 connects alternating current input L end, the other end of fuse F1 connects the end of the 3rd piezo-resistance ZT3, the other end of the 3rd piezo-resistance ZT3 connects alternating current input N end, and the two ends of the 3rd piezo-resistance ZT3 are connected with the EMI circuit input end.
4. binary channels DC output waterproof constant-current supply according to claim 1 is characterized in that: be connected with circuit of power factor correction between described input rectifying filter circuit and the power conversion circuit.
5. binary channels DC according to claim 1 exports the waterproof constant-current supply, it is characterized in that: described voltage feedback circuit comprises sample resistance, three terminal regulator and photoelectrical coupler, after described sample resistance is taken a sample the voltage signal of output rectifier and filter output, after comparing with three terminal regulator internal reference voltage source, the output error current signal, by the control end of photoelectrical coupler input PWM master controller, directly control output duty cycle, obtain burning voltage output.
6. binary channels DC according to claim 5 exports the waterproof constant-current supply; it is characterized in that: be connected with open loop protection circuit between described sample resistance and the three terminal regulator; described open loop protection circuit comprises the voltage-reference U1 that is connected with described sample resistance, the switching circuit that is connected with described voltage-reference U1; described switching circuit is connected with described three terminal regulator, and it is the integrated circuit modules of LM158 that described switching circuit adopts model.
7. binary channels DC exports the waterproof constant-current supply according to claim 1 or 5, it is characterized in that: it is the Switching Power Supply control chip of TEA1751T that described PWM master controller adopts model.
8. binary channels DC according to claim 1 exports the waterproof constant-current supply, it is characterized in that: described current limliting reduction voltage circuit comprises first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2, first resistance R 1 is in parallel with first capacitor C 1, second resistance R 2 is in parallel with second capacitor C 2, first capacitor C, 1 one ends connect alternating current input L end, the other end connects the first input end of regulator rectifier circuit, second capacitor C, 2 one ends connect alternating current input N end, and the other end connects second input of regulator rectifier circuit.
9. binary channels DC according to claim 1 exports the waterproof constant-current supply, it is characterized in that: described regulator rectifier circuit comprises rectifier bridge heap B1, Voltage stabilizing module U1, the first input end of described rectifier bridge heap B1 is connected with current limliting reduction voltage circuit first output, rectifier bridge heap B1 second input is connected with current limliting reduction voltage circuit second output, first output of rectifier bridge heap B1 is connected with the input of Voltage stabilizing module U1, second output head grounding of rectifier bridge heap B1, the output of Voltage stabilizing module U1 is connected with intelligent switching switch circuit, the common end grounding of Voltage stabilizing module U1.
10. binary channels DC according to claim 1 exports the waterproof constant-current supply, it is characterized in that: described intelligent switching switch circuit comprises relay K, the 3rd resistance R 3, diode VD1, relay coil one end ground connection, the other end respectively with the 3rd resistance R 3 one ends, the negative pole of diode VD1 connects, the other end of the 3rd resistance R 3 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013201103504U CN203119598U (en) | 2013-03-12 | 2013-03-12 | Double-channel direct-current (DC) output waterproof constant current power source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013201103504U CN203119598U (en) | 2013-03-12 | 2013-03-12 | Double-channel direct-current (DC) output waterproof constant current power source |
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| CN203119598U true CN203119598U (en) | 2013-08-07 |
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| CN2013201103504U Expired - Lifetime CN203119598U (en) | 2013-03-12 | 2013-03-12 | Double-channel direct-current (DC) output waterproof constant current power source |
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| CN103151829A (en) * | 2013-03-12 | 2013-06-12 | 重庆九亿光电仪器有限公司 | Two-channel direct-current (DC) output waterproof constant current power supply |
| CN103715917A (en) * | 2014-01-20 | 2014-04-09 | 电子科技大学 | Capacitance voltage-reducing circuit |
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| CN103151829A (en) * | 2013-03-12 | 2013-06-12 | 重庆九亿光电仪器有限公司 | Two-channel direct-current (DC) output waterproof constant current power supply |
| CN103151829B (en) * | 2013-03-12 | 2015-04-22 | 重庆九亿光电仪器有限公司 | Two-channel direct-current (DC) output waterproof constant current power supply |
| CN103715917A (en) * | 2014-01-20 | 2014-04-09 | 电子科技大学 | Capacitance voltage-reducing circuit |
| CN103715917B (en) * | 2014-01-20 | 2016-06-22 | 电子科技大学 | A kind of capacity voltage dropping circuit |
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| CN110063008A (en) * | 2016-10-28 | 2019-07-26 | 三菱电机株式会社 | Power-converting device and limitation of high harmonics device |
| CN110063008B (en) * | 2016-10-28 | 2021-09-28 | 三菱电机株式会社 | Power conversion device and harmonic suppression device |
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| CN110493922A (en) * | 2019-08-28 | 2019-11-22 | 厦门亚锝电子科技有限公司 | A kind of LED drive circuit of the low ripple without stroboscopic |
| CN113783413A (en) * | 2021-09-03 | 2021-12-10 | 株洲市众普森技术有限公司 | Method for changing PFC output voltage |
| CN116418249A (en) * | 2023-06-08 | 2023-07-11 | 深圳市斯康达电子有限公司 | AC/DC bidirectional conversion circuit |
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