CN102751878B - Special fly-back switching power supply for wine cabinet of ice bar and electronic refrigeration type water dispenser - Google Patents
Special fly-back switching power supply for wine cabinet of ice bar and electronic refrigeration type water dispenser Download PDFInfo
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- CN102751878B CN102751878B CN201210244578.2A CN201210244578A CN102751878B CN 102751878 B CN102751878 B CN 102751878B CN 201210244578 A CN201210244578 A CN 201210244578A CN 102751878 B CN102751878 B CN 102751878B
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Abstract
The invention discloses a special fly-back switching power supply for a wine cabinet of an ice bar and an electronic refrigeration type water dispenser. The special fly-back switching power supply comprises a low-frequency rectification filter circuit, a switch adjustment tube transformer, a peak recovery circuit, a high-frequency rectification filter circuit, a double-temperature-point monitoring gating circuit, two switchable feedback voltage sampling circuits, a PWM (pulse-width modulation) integrated switch control circuit, and a short circuit and overload protecting circuit, which are connected in order; at the same time, the control signal of an ultra-low temperature threshold monitor in the double-temperature-point monitoring gating circuit is connected with the PWM (pulse-width modulation) integrated switch control circuit; the output control signal of the short circuit and overload protecting circuit is connected with the PWM (pulse-width modulation) integrated switch control circuit; the driving signal of the PWM (pulse-width modulation) integrated switch control circuit is connected with the switch adjustment tube transformer and the peak recovery circuit; in this way, a plurality of voltage power supply modes can be achieved; three work states, namely a normal refrigeration state, an insulation refrigeration state and an ultra-low temperature stop (preventing the freezing of cold water) state, can be effectively implemented, so that the load safety is guaranteed and the PWM (pulse-width modulation) integrated switch control circuit can be quickly protected when the PWM (pulse-width modulation) integrated switch control circuit is applied to a high-voltage of 12V and a low-voltage of 5V.
Description
Technical field:
The present invention relates to switch power technology field, refer in particular to the inverse-excitation type switch power-supply that a kind of electronic cooling type water dispenser, ice wine cabinet are special.
Background technology:
The load of electronic cooling type water dispenser, ice wine cabinet contains semiconductor chilling plate and radiator fan (DC12V), the power supply basic demand of this series products is: provide high voltage (it is cold that such as DC12V realizes pressure) under hot environment, provide low-voltage (such as DC5V realizes weak refrigeration) under low temperature environment.The power supply of this traditional at present series products is all improved and is formed based on two-tube push-pull type Switching Power Supply, and inverse-excitation type switch power-supply is not applied in this area.
Two-tube push-pull type Switching Power Supply (being such as made up of TL494), element is too many, and cost is expensive, and symmetry component requirements is strict, and quality is difficult to ensure card; Secondly in order to realize the requirement of the product of water dispenser, the conventional vacuum method of this type of power supply adopts the circuit of single-point temperature control plus environmental temperature-compensating, but the method can cause supply power voltage when using in cold district too low (about 2V), very easily damage radiator fan, and cannot solve cold water freeze blocking delivery port problem; Simultaneously during low voltage operating (the large pressure drop of electric current is little) typical short circuit or overload protecting circuit much less responsive, difficultly play protection.
Summary of the invention:
The object of the invention is the shortcoming in order to overcome above-mentioned prior art, the inverse-excitation type switch power-supply that a kind of circuit protection is reliable, prevent cold water from freezing, provide the electronic cooling type water dispenser of multiple voltage powering mode, ice wine cabinet special is provided.
Now with electronic cooling type water dispenser power supply be designed to example analyze how to use the new scheme of the invention of inverse-excitation type switch power-supply to produce the power supply meeting product requirement:
The circuit of typical case's inverse-excitation type switch power-supply is shown in Fig. 1: civil power is after low frequency rectifying and wave-filtering, PWM integrated circuit (IC) 1 is started via Rc, the inner voltage stabilizing of IC1 produces voltage reference Vref, start-oscillation circuit works, controlled to export pulse pull switch pipe by PWM, the feedback voltage of transformer provides the voltage source needed for normal work to IC1 after rectifying and wave-filtering.The power supply of secondary voltage output loading after filtering high-frequency rectifier.The compensation end of the feedback circuit control IC1 be made up of elements such as IC2 and IC3 thus reach the process of voltage stabilizing.Overload and short-circuit protection are by the source electrode string resistance Rs at switching tube; current signal is delivered to current sampling end to realize protection. when power overload situation; the protection act of IC1 makes duty ratio reduce; output voltage reduces; the supply power voltage VCC of IC1 also and then reduces; when low can not work to IC1 time; whole circuit is closed; then start-up course is next time started by Rc. the fault that typical overload protecting circuit often causes because of protective circuit current feedback deficiency (particularly during low-voltage output, electric current is large and pressure drop is little).
The circuit of visible typical inverse-excitation type switch power-supply cannot realize the output of multiple voltage under a single vice-side winding, is not incubated required temperature spot supervisory circuit and perfect overload protecting circuit simultaneously.
The multiple voltage that the present invention uses new mentality of designing to realize single vice-side winding completely exports, has insulation and the manufacture of anti-icing stifled inverse-excitation type switch power-supply.The present invention is realized by following technical scheme:
The inverse-excitation type switch power-supply that electronic cooling type water dispenser, ice wine cabinet are special, includes low frequency current rectifying and wave filtering circuit, switch Correctional tube transformer and spike recovery circuit, rectifier filter circuit, the monitoring of two temperature point gating circuit, switchable two kinds of feedback voltage sample circuits, PWM integrated switch control circuit, over load protective circuit.Above circuit connects successively; simultaneously; the control signal of the ultralow temperature threshold monito in two temperature point monitoring gating circuit connects PWM integrated switch control circuit; the output control signal of over load protective circuit connects PWM integrated switch control circuit, and the drive singal of PWM integrated switch control circuit connects switch Correctional tube transformer and spike recovery circuit.
Switchable two kinds of feedback voltage sample circuits are provided with outside voltage inversion input in PWM integrated switch control circuit, switchable two kinds of feedback voltage sample circuits are made up of resistance R15, resistance R16, resistance R17 and triode T3, the output of the one termination Switching Power Supply of R15, another termination voltage inversion input and and R16, R17 be connected into resistor voltage divider network.Triode T3 is attempted by R17, grounded emitter.Triode T3 can be replaced by light-sensitive element.
Two temperature point monitoring gating circuit is made up of two positive feedback hysteresis comparator circuits such as low temperature threshold monito and ultralow temperature threshold monitos.
Low temperature threshold monito is made up of comparator AR2 and resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33 and thermistor NTC, R31 and R32 connects, R31 other end ground connection, the intermediate node of R32 another termination V-out, R31 and R32 connects the inverting input of AR2 through R30; NTC and R33 connects, another termination V-out of NTC, R33 other end ground connection, the intermediate node of NTC and R33 connects the normal phase input end of AR2 through R29, R28 makes the positive feedback resistor of AR2, and the output of AR2 connects pull-up resistor R22 meets feedback voltage sample circuit T3 simultaneously control end (base stage) through resistance R18.
Ultralow temperature threshold monito is made up of comparator AR1 and resistance R24, resistance R25, resistance R26, resistance R27, resistance R33 and thermistor NTC, R24 and R25 connects, R24 other end ground connection, the intermediate node of R25 another termination V-out, R24 and R25 connects the normal phase input end of AR1; NTC and R33 connects, another termination V-out of NTC, R33 other end ground connection, the intermediate node of NTC and R33 connects the inverting input of AR1 through R27, R26 makes the positive feedback resistor of AR1, and the output of AR1 accesses the current sampling feedback input end of PWM integrated switch control circuit after diode D8, resistance R7.
Compensate between end and current sampling feedback input end in the output of PWM integrated circuit U2 internal error amplifier and access over load protective circuit, over load protective circuit comprises resistance R2, resistance R8, resistance R11, resistance R12, driving tube T2 and electric capacity CD1, R2 and R8 connects, R2 other end ground connection, another termination of R8 exports and compensates end, the intermediate node of R2 and R8 connects the reference edge of the integrated T1 of voltage stabilizing benchmark, the plus earth of T1, negative pole connects the base stage of driving tube T2 through R12, T1 negative pole connects the Vref end of PWM integrated switch control circuit simultaneously through R11, the emitter of T2 connects Vref end, the collector electrode of T2 accesses current sampling feedback input end through R7, CD1 is connected in parallel on R2.
The technology of the Key Circuit unit of power supply of the present invention is described in detail as follows:
(1), realize by switchable two kinds of feedback voltage sample circuits the circuit that single vice-side winding can export multiple voltage.
Principle is shown in Fig. 4: have error amplifier in the inside of PWM integrated switch control circuit U1, its inner in-phase input end connects inner base bias voltage 2.5V, the design utilizes its voltage inversion input 2 pin to be provided with switchable resistance pressure-dividing network outside cleverly, the resistance pressure-dividing network switched is made up of resistance R15, resistance R16, resistance R17 and triode T3, the output of the one termination Switching Power Supply of resistance R15, another termination voltage inversion input 2 pin and and R16, R17 be connected into resistor voltage divider network.
When output voltage uprise cause 2 pin voltage Va raise time, 1 pin voltage drop after voltage amplification, cause U1 6 pin export pulse duration narrow, switch transistor T 5 ON time shortens, the secondary secondary voltage step-down of transformer B1.Otherwise when output voltage step-down, control procedure is contrary with this process, thus makes output voltage stabilization.
The resistance pressure-dividing network that the design is switched by conducting and the cut-off of triode T3, the design of resistance parameter calculates by analyzing as follows
Because reference voltage is 2.5V, so:
(1), when requiring output voltage V-out=12V, 12xR16 ≈ 2.5x (R15+R16) should be met
(2) when requiring output voltage V-out=5V, should meet: R15 ≈ R16+R17
Therefore can be calculated: R15 ≈ 3.8xR16; R17 ≈ 2.8xR16
The resistance parameter (R15 ≈ 3.8xR16, R17 ≈ 2.8xR16) of appropriate design resistance can make:
(1), when Vc=high level, T3 conducting, resistance pressure-dividing network is made up of R15 and R16, and power supply exports V-out=12V.
(2) when Vc=low level, T3 ends, and resistance pressure-dividing network is made up of R15, R16 and R17, and power supply exports V-out=5V.
(2) requirement of anti-icing stifled water dispenser under insulation and ultralow temperature under low temperature, is realized by two temperature point monitoring gating circuit.
Principle is as Fig. 5: comparator AR1 and AR2 forms the positive feedback hysteresis comparator circuit of two different temperature control points, hysteresis comparator circuit and electric capacity CP5 together play the effect reducing to cause the shake (fluctuating) of output near threshold value, and positive feedback is also conducive to accelerating response speed.Here low temperature threshold monito is 5 DEG C of threshold monitos, and ultralow temperature threshold monito is 2 DEG C of threshold monitos.
5 DEG C of (low temperature) threshold monitos are made up of comparator AR2 and resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33 and NTC, NTC is the thermistor (temperature) sensor being arranged on the negative temperature coefficient that cold water is filled with, wherein R31=R33, R32=RNTC5 (resistance that thermistor is corresponding 5 DEG C time), the dividing potential drop reference point of R31 and R32 connects inverting input "-" through R30, and the dividing point of NTC and R33 connects normal phase input end "+" through R29.When water dispenser has just been started shooting and used, water temperature is higher, and the resistance of NTC is less, now the some position of the normal phase input end "+" of AR2 is greater than the some position of inverting input "-", and the output of AR2 is high some position, T3 conducting, switch power source output voltage is 12V, and water dispenser is in pressure cold state.When the water temperature drop to 5 DEG C of water pot, point position along with the normal phase input end "+" of the increase AR2 of NTC resistance is less than the some position of inverting input "-", and the output Vc of AR2 is low spot position, and T3 ends, switch power source output voltage is 5V, and water dispenser is in keeping warm mode.
2 DEG C of (ultralow temperature) threshold monitos are made up of comparator AR1 and resistance R24, resistance R25, resistance R26, resistance R27, resistance R33 and NTC, its operation principle and above-mentioned AR1 comparator similar, R24=R33, R25=RNTC2 (resistance that thermistor is corresponding 2 DEG C time).Water temperature is once reach about 2 DEG C, the output Vd of AR1 is high some position, the 3 pin point position Vb that Vd draws high U1 by D8, R7 are greater than 1V, thus make PWM not have driving pulse to export, and switch transistor T 5 turns off, U1 quits work, Switching Power Supply exports as 0V, and the load (semiconductor chilling plate and DC radiation fan) of water dispenser quits work, through after a while or after moisturizing makes water temperature raise, the output Vd of AR1 is just low spot position, and water dispenser is got back to insulation or forced cold state.
Just due to the ultralow temperature control action of 2 DEG C of threshold monitos, just making to there will not be when using in cold district water pot to freeze plugging fault.Use the monitoring of two temperature spot thresholdings also to solve output that conventional push-pull power supply crosses low-voltage (2V) causes radiator fan to damage fault simultaneously.
(3), the over load protective circuit of additional new fast high-sensitive degree
Principle as Fig. 6: R2 and R8 form voltage sample circuit, when short circuit overload occurs, the output of PWM integrated switch control circuit U1 compensates 1 pin voltage V1 and draws and lifts rapidly to more than 5V, when the sampling voltage on divider resistance R2 is greater than 2.5V.The integrated T1 of voltage stabilizing benchmark (TL431) and driving tube T2 conducting, thus the current sampling input 3 pin voltage Vb of U1 will be forced to draw and lift to rise to more than 1V, then the current sense comparator of U1 inside is made to export high level, block PWM driving pulse to export, switch transistor T 5 turns off, feedback winding cannot provide operating voltage that U1 is quit work, after quitting work, the 1 pin voltage V1 current potential of U1 disappears, U1 again powers up starting of oscillation by starting resistance R1 and starts, go round and begin again, until short circuit overload phenomenon disappears, rear circuit just recovers normal operating conditions automatically.
The design of the ice wine cabinet power supply of electronic cooling realizes by changing the control point (resistance of conversion R25, R32) of the temperature that adapts.
After adopting the technical program, the invention has the beneficial effects as follows:
1. inverse-excitation type switch power-supply only has a vice-side winding, and the resistor network fed back by switched voltage is affected feedback sample voltage and realizes multiple voltage powering mode (DC12V, DC5V and power failure).
2. the control of pair temperature control circuit effectively can realize normal refrigeration, insulation refrigeration and ultralow temperature and shut down (preventing cold water from freezing) three kinds of operating states, guarantees that the payload security fixed uses and is not damaged.
3. additional high-adaptability rapid cut-off overload protection unit, guarantees that dual-purpose all can be protected fast when high voltage 12V and low-voltage 5V work.
Accompanying drawing illustrates:
Fig. 1 is the schematic diagram of typical inverse-excitation type switch power-supply;
Fig. 2 is the invention process circuit frame figure;
Fig. 3 is the principle full figure of circuit of the present invention;
Fig. 4 is that the present invention realizes by convert resistance potential-divider network the circuit diagram that single vice-side winding can export multiple voltage;
Fig. 5 is the schematic diagram of two temperature of the present invention some monitoring gating circuit;
Fig. 6 is fast short-circuit protective circuit of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, this technology is described further.
Fig. 2 is implementing circuit system block diagram, and power circuit of the present invention forms by with lower part:
1, low frequency current rectifying and wave filtering circuit; 2, switch Correctional tube transformer and spike recovery circuit; 3, rectifier filter circuit; 4, two temperature point monitoring gating circuit; 5, switchable feedback voltage sample circuit; 6, PWM integrated switch control circuit; 7, over load protective circuit; 8, NTC and status indicator lamp; 9, load (DC fan and semiconductor chilling plate).
The detailed schematic diagram of power supply of the present invention is shown in Fig. 3:
1, power supply obtains higher direct voltage by electrolytic capacitor EC1 filtering after diode D1 ~ D4 rectification.
2, high direct voltage enters the power import VCC pin of PWM integrated switch control circuit U1 after starting resistance R1, PWM integrated switch control circuit U1 provides the reference voltage V ref of 5V through inner voltage stabilizing, resistance R14 and electric capacity CD3 forms oscillating circuit, and 6 pin of PWM integrated switch control circuit export pulse pull switch pipe T5.
3, switch transistor T 5 and transformer B1 form inverse-excitation type transducing circuit, spike recovery circuit is made up of resistance R6, electric capacity CD2 and fast diode D7, and feedback winding provides normal operating voltage by after electrolytic capacitor EC2, electric capacity CP3 filtering, voltage stabilizing didoe ZD1 pressure limiting to U1 through diode D6 rectification, resistance R10.
4, the load voltage of secondary voltage stable output after rectifying tube T6 rectification and electrochemical capacitor EC3, inductance L 1 and electrochemical capacitor EC4 High frequency filter of transformer secondary winding output, for load DC fan and semiconductor chilling plate work.
5, the thermistor NTC of negative temperature coefficient and resistance R33 connects, and its component voltage provides comparison signal respectively to the input of two hysteresis comparator AR1 and AR2.AR2 and resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33 and NTC form 5 DEG C of cold water temperature supervisory circuits.When the temperature of NTC induction is greater than 5 DEG C, AR2 exports high level, and high voltage one tunnel makes triode T3 conducting, and the change of control voltage feedback sample circuit is made up of resistance R15, resistance R16, makes power supply export DC12V; Another path resistor R21 makes LED1(refrigeration indicator light) bright.When temperature is less than 5 DEG C, AR2 output low level, triode T3 ends, control the change of feedback sample circuit to be made up of resistance R15, resistance R16, resistance R17, make power supply export DC5V, simultaneously because triode T4 ends, V-out makes insulation indicator light LED2 bright through resistance R20.
AR1 and resistance R24, resistance R25, resistance R26, resistance R27, resistance R33 and thermistor NTC form 2 DEG C of temperature monitoring circuits, when NTC low to 2 DEG C time, the high level that AR1 exports forces the current sampling input 3 pin voltage Vb making U1 to be drawn platform to more than 1V after diode D8, resistance R7, U1 no pulse is exported, switch transistor T 5 turns off, complete machine power supply exports as 0V, until when the resistance of NTC is replied more than 2 DEG C, there is output power supply V-out side.
6, switch to two kinds of different voltage feedback network circuit by the conducting of T3 or cut-off, thus realize the output mode of DC12V or DC5V.
7, the integrated T1 of benchmark and driving tube T2 forms high-sensitive short circuit overload protecting circuit.
Above-mentioned invention Switching Power Supply, has function admirable, complete function, with low cost, the little characteristic of volume, be electronic cooling type water dispenser special energy-conservation, safety good power supply.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore every content not departing from technical solution of the present invention, the equivalence done according to the shape of the present invention, structure and principle change, all should be covered by protection scope of the present invention.
Claims (2)
1. electronic cooling type water dispenser, the inverse-excitation type switch power-supply that ice wine cabinet is special, include low frequency current rectifying and wave filtering circuit, switch Correctional tube transformer and spike recovery circuit, rectifier filter circuit, two temperature point monitoring gating circuit, switchable two kinds of feedback voltage sample circuits, PWM integrated switch control circuit, over load protective circuit, above circuit connects successively, simultaneously, the control signal of 2 DEG C of ultralow temperature threshold monitos in two temperature point monitoring gating circuit connects PWM integrated switch control circuit, the output control signal of over load protective circuit connects PWM integrated switch control circuit, the drive singal of PWM integrated switch control circuit connects switch Correctional tube transformer and spike recovery circuit,
Switchable two kinds of feedback voltage sample circuits are provided with outside voltage inversion input in PWM integrated switch control circuit, switchable two kinds of feedback voltage sample circuits are made up of resistance R15, resistance R16, resistance R17 and triode T3, the output of the one termination Switching Power Supply of resistance R15, another termination voltage inversion input and and resistance R16, resistance R17 be connected into resistor voltage divider network, triode T3 is attempted by resistance R17, grounded emitter, triode T3 can be replaced by light-sensitive element;
Two temperature point monitoring gating circuit is made up of 5 DEG C of low temperature threshold monitos and 2 DEG C of ultralow temperature threshold monitos, two positive feedback hysteresis comparator circuits;
5 DEG C of low temperature threshold monitos are made up of comparator AR2 and resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33 and thermistor NTC, resistance R31 and resistance R32 connects, resistance R31 other end ground connection, another termination V-out of resistance R32, the intermediate node of resistance R31 and resistance R32 connects the inverting input of comparator AR2 through resistance R30; Thermistor NTC and resistance R33 connects, another termination V-out of thermistor NTC, resistance R33 other end ground connection, the intermediate node of NTC and resistance R33 connects the normal phase input end of comparator AR2 through resistance R29, resistance R28 makes comparisons the positive feedback resistor of device AR2, and the output of comparator AR2 connects pull-up resistor R22 meets feedback voltage sample circuit T3 simultaneously base stage through resistance R18;
2 DEG C of ultralow temperature threshold monitos are made up of comparator AR1 and resistance R24, resistance R25, resistance R26, resistance R27, resistance R33 and thermistor NTC, resistance R24 and resistance R25 connects, resistance R24 other end ground connection, another termination V-out of resistance R25, the intermediate node of resistance R24 and resistance R25 connects the normal phase input end of comparator AR1; Thermistor NTC and resistance R33 connects, another termination V-out of thermistor NTC, resistance R33 other end ground connection, the intermediate node of thermistor NTC and resistance R33 connects the inverting input of comparator AR1 through resistance R27, resistance R26 makes comparisons the positive feedback resistor of device AR1, and the output of comparator AR1 accesses the current sampling feedback input end of PWM integrated switch control circuit after diode D8, resistance R7.
2. electronic cooling type water dispenser according to claim 1, the inverse-excitation type switch power-supply that ice wine cabinet is special, it is characterized in that: compensate between end and current sampling feedback input end in the output of PWM integrated circuit U2 internal error amplifier and access over load protective circuit, over load protective circuit comprises resistance R2, resistance R8, resistance R11, resistance R12, driving tube T2 and electric capacity CD1, resistance R2 and resistance R8 connects, resistance R2 other end ground connection, another termination of resistance R8 exports and compensates end, the intermediate node of resistance R2 and resistance R8 connects the reference edge of the integrated T1 of voltage stabilizing benchmark, the plus earth of the integrated T1 of voltage stabilizing benchmark, negative pole connects the base stage of driving tube T2 through resistance R12, the integrated T1 negative pole of voltage stabilizing benchmark connects the Vref end of PWM integrated switch control circuit simultaneously through resistance R11, the emitter of driving tube T2 connects Vref end, the collector electrode of driving tube T2 accesses current sampling feedback input end through resistance R7, electric capacity CD1 is connected in parallel on resistance R2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210244578.2A CN102751878B (en) | 2012-07-14 | 2012-07-14 | Special fly-back switching power supply for wine cabinet of ice bar and electronic refrigeration type water dispenser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210244578.2A CN102751878B (en) | 2012-07-14 | 2012-07-14 | Special fly-back switching power supply for wine cabinet of ice bar and electronic refrigeration type water dispenser |
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| CN102751878A CN102751878A (en) | 2012-10-24 |
| CN102751878B true CN102751878B (en) | 2015-02-11 |
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| EP1679783A2 (en) * | 2005-01-07 | 2006-07-12 | Harman International Industries, Incorporated | Current controlled switch mode power supply |
| JP2009130975A (en) * | 2007-11-20 | 2009-06-11 | Canon Inc | Power unit |
| KR100980242B1 (en) * | 2009-10-08 | 2010-09-06 | 주식회사 유성반도체 | Switching-mode power supply |
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