CN103051206B - Fresh-keeping device power control circuit, device and control method thereof - Google Patents
Fresh-keeping device power control circuit, device and control method thereof Download PDFInfo
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- CN103051206B CN103051206B CN201210539396.8A CN201210539396A CN103051206B CN 103051206 B CN103051206 B CN 103051206B CN 201210539396 A CN201210539396 A CN 201210539396A CN 103051206 B CN103051206 B CN 103051206B
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Abstract
The present invention discloses a kind of fresh-keeping device power control circuit, device and control method thereof, and this control method comprises the following steps: the power input voltage of interchange is carried out rectification by input rectifying filter circuit, is converted to direct current; Drive circuit according to the power input voltage of direct current, driver output electric power output voltage; Voltage detecting circuit detects electric power output voltage, and output detection signal; Controller reads detection signal, and according to the amplitude of detection signal, exports control signal; Output control circuit, according to control signal, controls electric power output voltage and exports to load.The present invention increases voltage detecting circuit at power output end, power output and the output current of fresh-keeping device power supply can be limited, solve the problem that mains voltage variations is comparatively large, fresh-keeping device is standby for a long time, make fresh-keeping device power supply meet UL1310? CLASS? the requirement of TWO safety certification.Meanwhile, circuit of the present invention and apparatus structure simple and reliable, control method simple possible.<!--1-->
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of fresh-keeping device power control circuit, device and control method thereof.
Background technology
Existing field of household appliances, a lot of product all uses Switching Power Supply.Conventional fresh-keeping device switching power source control circuit, usually without power feedback loop, can not control effectively to peak power output.In the exigent occasion of circuit safety performance, the method can not meet the requirement of safety certification (as certifications such as UL1310).
In prior art, there is following technical problem in fresh-keeping device power control circuit:
1, power output and output current can not be controlled, the requirement (CLASSTWO requires that power output is less than 100W, and output current is less than 8A simultaneously) of UL1310CLASSTWO can not be met.
2, (exceed+10%) when mains voltage variations is larger, standby power likely can upwards drift about in time, and directly can damage fresh-keeping device power control circuit when stand-by time is longer, impact normally uses.
3, when power output is too stablized, when load directly connected by relay, can continuous operation 7 hours and do not damage power control circuit, but can outer casing of power supply be burnt out, do not meet UL1310 certification; When power output is unstable, when short-circuit relay directly connects load, continuous operation is after ten minutes to 30 minutes, fresh-keeping device power control circuit constantly hockets work or do not work, protective tube can not blow, and can not meet UL1310 safety certification continuous operation requirement in 1 hour.
Summary of the invention
Main purpose of the present invention proposes a kind of fresh-keeping device power control circuit, device and control method thereof, is intended to the power output and the output current that limit fresh-keeping device power supply, makes fresh-keeping device power supply meet the requirement of UL1310CLASSTWO safety certification.
In order to achieve the above object, the present invention proposes a kind of fresh-keeping device power control circuit, this fresh-keeping device power control circuit is connected between power input and load supplying end, comprise input rectifying filter circuit, drive circuit, controller and output control circuit, this fresh-keeping device power control circuit also comprises voltage detecting circuit;
The input of described input rectifying filter circuit is connected with described power input, the output of described input rectifying filter circuit is connected with the input of described drive circuit, and the output of described drive circuit is connected with the input of described voltage detecting circuit and the input of described output control circuit respectively; The output of described voltage detecting circuit is connected with the test side of described controller, and the control end of described controller is connected with the control end of described output control circuit, and the output of described output control circuit is connected with described load supplying end; Wherein:
Described input rectifying filter circuit is used for the power input voltage of interchange to carry out rectification, is converted to direct current;
Described drive circuit is used for the described power input voltage according to direct current, driver output electric power output voltage;
Described voltage detecting circuit is for detecting described electric power output voltage, and output detection signal;
Described controller for reading described detection signal, and according to the amplitude of described detection signal, exports control signal;
Described output control circuit is used for according to described control signal, controls described electric power output voltage and exports to load.
Preferably, described input rectifying filter circuit comprises fuse, piezo-resistance, the first diode, the second diode, the 3rd diode, the 4th diode, the first resistance, the second resistance and the first electric capacity; Wherein:
One end of described fuse is connected with the live wire end of described power input, and the other end of described fuse is connected through the zero line side of described piezo-resistance with described power input; Described first diode and described second Diode series branch road and described 3rd diode and described 4th Diode series branch circuit parallel connection, and be connected across between the live wire end of described power input and zero line side, the conducting direction of described first diode and described second diode is contrary, and the conducting direction of described 3rd diode and described 4th diode is contrary; Described first resistance is in parallel with described second resistance and described first capacitive series branch, described first resistance is connected with the common port of described first diode and described second diode with the common port of described second resistance, and described first resistance is connected with the common port of described 3rd diode and described 4th diode with the common port of described first electric capacity.
Preferably, described drive circuit comprises a bidirectional diode, the first triode, the second triode, the 3rd resistance, the 4th resistance, the 5th diode, the 6th diode, the second electric capacity, the 3rd electric capacity, an inductor and a transformer; Wherein:
The collector electrode of described first triode is connected with the common port of described first resistance and described second resistance, between the base stage that first coil of described 3rd resistance and described inductor is connected to described first triode after mutually connecting and emitter, described 5th diode is connected between the collector and emitter of described first triode; Between the base stage that second coil of described 4th resistance and described inductor is connected to described second triode after mutually connecting and emitter, described 6th diode is connected between the collector and emitter of described second triode; The input of described bidirectional diode is connected with the common port of described first resistance and described first electric capacity, and the common port of the second coil of output and described 4th resistance and described inductor is connected; One end of the primary coil of described transformer is through the tertiary coil of described inductor, be connected with the emitter of described first triode and the collector electrode of described second triode respectively, the other end of the primary coil of described transformer is connected through the collector electrode of described second electric capacity with described first triode, and is connected with the emitter of described second triode through described 3rd electric capacity; The two ends of the secondary coil of described transformer are connected with the input of described voltage detecting circuit.
Preferably, described voltage detecting circuit comprises output rectification filter unit and detecting unit;
The input of described output rectification filter unit is as the input of described voltage detecting circuit, be connected to the two ends of described transformer secondary coil, the output of described output rectification filter unit is connected with the input of described detecting unit, the output of described detecting unit, as the output of described voltage detecting circuit, is connected with the test side of described controller; Wherein:
Described output rectification filter unit is used for the described electric power output voltage exchanged to carry out rectification, is converted to direct current;
Described detecting unit is used for detecting the described electric power output voltage of direct current, output detection signal.
Preferably, described output rectification filter unit comprises the 7th diode, the 8th diode, the 9th diode, the tenth diode, the second electric capacity and the 3rd resistance; Wherein:
Described 7th diode and described 8th Diode series branch road and described 9th diode and described tenth Diode series branch circuit parallel connection, and be connected across the two ends of described transformer secondary coil, the conducting direction of described 7th diode and described 8th diode is contrary, and the conducting direction of described 9th diode and described tenth diode is contrary; One end of described 4th electric capacity is connected with the common port of described 7th diode and described 8th diode, and the other end is connected with the common port of described 9th diode and described tenth diode; Described 5th resistance and described 4th Capacitance parallel connection, a common port, as the output of described output rectification filter unit, is connected with the input of described detecting unit, another common end grounding.
Preferably, described detecting unit comprises the 6th resistance and the 7th resistance; One end of described 6th resistance, as the input of described detecting unit, is connected with a common port of described 4th electric capacity and described 5th resistance; One end of described 7th resistance and the other end of described 6th resistance, and as the output of described detecting unit, be connected with the test side of described controller, the other end ground connection of described 7th resistance.
Preferably, described output control circuit comprises the 5th electric capacity, the 6th electric capacity, a detection tube, a protection tube, the 3rd triode, a relay and auxiliary power supply end; Wherein:
One end of described 5th electric capacity is connected with the control end of described controller, and the other end is connected with the input of described detection tube; Described 6th electric capacity is connected between the first output of described detection tube and the second output, and one end of described 6th electric capacity is connected with the base stage of described 3rd triode, other end ground connection; The grounded emitter of described 3rd triode, the collector electrode of described 3rd triode is connected with the input of described protection tube and one end of described relay respectively; The other end of described relay is all connected with described auxiliary power supply end with the output of described protection tube; One contact of described relay is connected with the secondary coil of described transformer, and another contact is connected with described load supplying end.
The present invention also proposes a kind of fresh-keeping device power control, this fresh-keeping device power control comprises fresh-keeping device power control circuit, this fresh-keeping device power control circuit is connected between power input and load supplying end, comprise input rectifying filter circuit, drive circuit, controller and output control circuit, this fresh-keeping device power control circuit also comprises voltage detecting circuit;
The input of described input rectifying filter circuit is connected with described power input, the output of described input rectifying filter circuit is connected with the input of described drive circuit, and the output of described drive circuit is connected with the input of described voltage detecting circuit and the input of described output control circuit respectively; The output of described voltage detecting circuit is connected with the test side of described controller, and the control end of described controller is connected with the control end of described output control circuit, and the output of described output control circuit is connected with described load supplying end; Wherein:
Described input rectifying filter circuit is used for the power input voltage of interchange to carry out rectification, is converted to direct current;
Described drive circuit is used for the described power input voltage according to direct current, driver output electric power output voltage;
Described voltage detecting circuit is for detecting described electric power output voltage, and output detection signal;
Described controller for reading described detection signal, and according to the amplitude of described detection signal, exports control signal;
Described output control circuit is used for according to described control signal, controls described electric power output voltage and exports to load.
The present invention also proposes a kind of control method of fresh-keeping device power control further, and this control method comprises the following steps:
Step S10: the power input voltage of interchange is carried out rectification by input rectifying filter circuit, is converted to direct current;
Step S20: drive circuit according to the described power input voltage of direct current, driver output electric power output voltage;
Step S30: voltage detecting circuit detects described electric power output voltage, and output detection signal;
Step S40: controller reads described detection signal, and according to the amplitude of described detection signal, export control signal;
Step S50: output control circuit, according to described control signal, controls described electric power output voltage and exports to load.
Preferably, described step S30 comprises:
Step S31: the described electric power output voltage exchanged is carried out rectification by output rectification filter unit, is converted to direct current;
Step S32: the described electric power output voltage of detecting unit to direct current detects, output detection signal.
The fresh-keeping device power control circuit that the present invention proposes, device and control method thereof, carry out rectification by input rectifying filter circuit by the power input voltage of interchange, be converted to direct current; Drive circuit according to the described power input voltage of direct current, driver output electric power output voltage; Voltage detecting circuit detects described electric power output voltage, and output detection signal; Controller reads described detection signal, and according to the amplitude of described detection signal, exports control signal; Output control circuit, according to described control signal, controls described electric power output voltage and exports to load.The present invention increases voltage detecting circuit at power output end and detects electric power output voltage, power output and the output current of fresh-keeping device power supply can be limited, solve the problem that mains voltage variations is comparatively large, fresh-keeping device is standby for a long time, make fresh-keeping device power supply meet the requirement of UL1310CLASSTWO safety certification.Meanwhile, circuit of the present invention and apparatus structure simple and reliable, control method simple possible.
Accompanying drawing explanation
Fig. 1 is the theory diagram of fresh-keeping device power control circuit of the present invention preferred embodiment;
Fig. 2 is the theory diagram of voltage detecting circuit in fresh-keeping device power control circuit of the present invention;
Fig. 3 is the circuit structure diagram of fresh-keeping device power control circuit of the present invention preferred embodiment;
Fig. 4 is the schematic flow sheet of the control method preferred embodiment of fresh-keeping device power control of the present invention;
Fig. 5 is the schematic flow sheet of control method step S30 mono-embodiment of fresh-keeping device power control of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention proposes a kind of fresh-keeping device power control circuit.
With reference to the theory diagram that Fig. 1, Fig. 1 are fresh-keeping device power control circuit 200 of the present invention preferred embodiment.
In the embodiment of the present invention, fresh-keeping device power control circuit 200 is connected between power input 100 and load supplying end 300, comprises input rectifying filter circuit 210, drive circuit 220, voltage detecting circuit 230, controller 240 and output control circuit 250.
The input of input rectifying filter circuit 210 is connected with power input 100, the output of input rectifying filter circuit 210 is connected with the input of drive circuit 220, and the output of drive circuit 220 is connected with the input of voltage detecting circuit 230 and the input of output control circuit 250 respectively; The output of voltage detecting circuit 230 is connected with the test side of controller 240, and the control end of controller 240 is connected with the control end of output control circuit 250, and the output of output control circuit 250 is connected with load supplying end 300.
Wherein, input rectifying filter circuit 210, for the power input voltage of interchange is carried out rectification, is converted to direct current;
Drive circuit 220 for the power input voltage according to direct current, driver output electric power output voltage;
Voltage detecting circuit 230 is for detecting electric power output voltage, and output detection signal;
Controller 240 for reading detection signal, and according to the amplitude of detection signal, exports control signal;
Output control circuit 250, for according to control signal, controls electric power output voltage and exports to load.
In the present embodiment, from the alternating current that power input 100 inputs, through the rectification of input rectifying filter circuit 210, alternating current is converted to direct current, galvanic current source input voltage is obtained again after filtering, and this DC power supply input voltage is input to drive circuit 220, drive circuit 220 carries out processing rear out-put supply output voltage to voltage detecting circuit 230 according to this DC power supply input voltage, voltage detecting circuit 230 detects this electric power output voltage, output detection signal is to the test side of controller 240, controller 240 is by reading this detection signal after A/D conversion, and according to the amplitude of read detection signal, judge whether to export control signal to output control circuit 250, and then whether control to load out-put supply output voltage.
Referring to figs. 1 through the theory diagram that Fig. 3, Fig. 1 are fresh-keeping device power control circuit 200 of the present invention preferred embodiment; Fig. 2 is the theory diagram of voltage detecting circuit 230 in fresh-keeping device power control circuit 200 of the present invention; Fig. 3 is the circuit structure diagram of fresh-keeping device power control circuit 200 of the present invention preferred embodiment.
In above-described embodiment, input rectifying filter circuit 210 comprises fuse F1, piezo-resistance ZNR1, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the first resistance R1, the second resistance R2 and the first electric capacity C1.
Wherein, one end of fuse F1 is connected with the live wire end L of power input 100, and the other end of fuse F1 is connected with the zero line side N of power input 100 through piezo-resistance ZNR1; First diode D1 and the second diode D2 series arm in parallel with the 3rd diode D3 and the 4th diode D4 series arm, and be connected across between the live wire end L of power input 100 and zero line side N, the conducting direction of the first diode D1 and the second diode D2 is contrary, and the conducting direction of the 3rd diode D3 and the 4th diode D4 is contrary; First resistance R1 is in parallel with the second resistance R2 and the first electric capacity C1 series arm, first resistance R1 is connected with the common port of the first diode D1 and the second diode D2 with the common port of the second resistance R2, the common port of the first resistance R1 and the first electric capacity C1, through the 13 diode D13, is connected with the common port of the 3rd diode D3 and the 4th diode D4.
In the present embodiment; fresh-keeping device power control circuit 200 is protected by fuse F1 and piezo-resistance ZNR1; it is made not burn out because of the abrupt transients of power input voltage; utilize the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 to form rectifier bridge, rectification is carried out to power input voltage.
Particularly, drive circuit 220 comprises bidirectional diode DA1, the first triode Q1, the second triode Q2, the 3rd resistance R3, the 4th resistance R4, the 5th diode D5, the 6th diode D6, the second electric capacity C2, the 3rd electric capacity C3, inductor TA and transformer T1, in the present embodiment, the first triode Q1 and the second triode Q2 is NPN type triode.
Wherein, the collector electrode of the first triode Q1 is connected with the common port of the first resistance R1 and the second resistance R2, between the base stage being connected to the first triode Q1 after the first coil TA1 of the 3rd resistance R3 and inductor TA connects mutually and emitter, 5th diode D5 is connected between the collector and emitter of the first triode Q1, namely the negative electrode of the 5th diode D5 is connected with the collector electrode of the first triode Q1, and the anode of the 5th diode D5 is connected with the emitter of the first triode Q1; Between the base stage being connected to the second triode Q2 after the second coil TA2 of the 4th resistance R4 and inductor TA connects mutually and emitter, 6th diode D6 is connected between the collector and emitter of the second triode Q2, namely the negative electrode of the 6th diode D6 is connected with the collector electrode of the second triode Q2, and the anode of the 6th diode D6 is connected with the emitter of the second triode Q2; The input of bidirectional diode DA1 is connected with the common port of the first resistance R1 and the first electric capacity C1, and the output of bidirectional diode DA1 is connected with the common port of the second coil TA2 of the 4th resistance R4 and inductor TA; One end of the primary coil of transformer T1 is through the tertiary coil TA3 of inductor TA, be connected with the emitter of the first triode Q1 and the collector electrode of the second triode Q2 respectively, the other end of the primary coil of transformer T1 is connected with the collector electrode of the first triode Q1 through the second electric capacity C2, and is connected with the emitter of the second triode Q2 through the 3rd electric capacity C3; The two ends of the secondary coil of transformer T1 are connected with the input of voltage detecting circuit 230.
In the present embodiment, when starting to power on, power input voltage drives the second triode Q2 conducting through bidirectional diode DA1, on the tertiary coil TA3 of inductor TA, the electric current of both forward and reverse directions is had to alternately pass through afterwards, at the first coil TA1 of inductor TA and the drive singal of the second coil TA2 generation out of phase, driven first triode Q1 and the second triode Q2 conducting; 3rd resistance R3 is the base stage current-limiting resistance of the first triode Q1, also the first coil TA1 of inductor TA is impelled to drive the first triode Q1 conducting, 4th resistance R4 is the base stage current-limiting resistance of the second triode Q2, also impels the second coil TA2 of inductor TA to drive the second triode Q2 conducting; Because the electric current on the tertiary coil TA3 of inductor TA constantly changes, therefore the 5th diode D5 and the 6th diode D6 is used for providing afterflow passage for the first triode Q1 and the second triode Q2, and the second electric capacity C2, the 3rd electric capacity C3 and transformer T1 form oscillating current loop.
Particularly, voltage detecting circuit 230 comprises output rectification filter unit 231 and detecting unit 232.
The input of output rectification filter unit 231 is as the input of voltage detecting circuit 230, be connected to the two ends of transformer T1 secondary coil, the output of output rectification filter unit 231 is connected with the input of detecting unit 232, the output of detecting unit 232, as the output of voltage detecting circuit 230, is connected with the test side V_DIT of controller 240.
Wherein, output rectification filter unit 231, for the electric power output voltage of interchange is carried out rectification, is converted to direct current;
Detecting unit 232 for detecting the electric power output voltage of direct current, output detection signal.
In the present embodiment, the electric power output voltage obtained from transformer T1 two ends is alternating current, after output rectification filter unit 231 carries out rectification and filtering, is converted to galvanic current, detecting unit 232 detects this direct current, with to controller 240 output detection signal.
Particularly, output rectification filter unit 231 comprises the 7th diode D7, the 8th diode D8, the 9th diode D9, the tenth diode D10, the 4th electric capacity C4 and the 5th resistance R5.
Wherein, 7th diode D7 and the 8th diode D8 series arm in parallel with the 9th diode D9 and the tenth diode D10 series arm, and be connected across the two ends of transformer T1 secondary coil, the conducting direction of the 7th diode D7 and the 8th diode D8 is contrary, and the conducting direction of the 9th diode D9 and the tenth diode D10 is contrary; One end of 4th electric capacity C4 is connected with the common port of the 7th diode D7 and the 8th diode D8, and the other end of the 4th electric capacity C4 is connected with the common port of the 9th diode D9 and the tenth diode D10; 5th resistance R5 is in parallel with the 4th electric capacity C4, one common port of the 5th resistance R5 and the 4th electric capacity C4 parallel connection is as the output of output rectification filter unit 231, be connected with the input of detecting unit 232, another common end grounding of the 5th resistance R5 and the 4th electric capacity C4 parallel connection.
In the present embodiment, 7th diode D7, the 8th diode D8, the 9th diode D9 and the tenth diode D10 are high-frequency diode, 7th diode D7, the 8th diode D8, the 9th diode D9 and the tenth diode D10 form rectifier bridge, rectification is carried out to the electric power output voltage exchanged, 4th electric capacity C4 and the 5th resistance R5 forms filter circuit, filtering is carried out to the electric power output voltage after rectification, makes its stable output.
Particularly, detecting unit 232 comprises the 6th resistance R6 and the 7th resistance R7; One end of 6th resistance R6 is as the input of detecting unit 232, and be connected with a common port of the 4th electric capacity C4 and the 5th resistance R5 parallel connection through the 14 diode D14, the 14 diode D14 guarantees not reflux through rectification and filtered electric power output voltage; One end of 7th resistance R7 and the other end of the 6th resistance R6, and as the output of detecting unit 232, be connected with the test side V_DIT of controller 240, the test side V_DIT of controller 240 is the A/D mouth of controller 240, the other end ground connection of the 7th resistance R7.
In the present embodiment, by the 6th resistance R6 and the 7th resistance R7, dividing potential drop is carried out to the electric power output voltage of the direct current after rectifying and wave-filtering, the voltage that 7th resistance R7 produces is the voltage detected, according to detected voltage, output detection signal is to controller 240, the present embodiment is before exporting detection signal to controller 240, first through limiter tube D15, clamper is carried out to detection signal, and filtering is carried out to detection signal, to make detection signal more stable through the 7th electric capacity C7 and the 8th electric capacity C8; Controller 240 is single-chip microcomputer, controller 240 reads detection signal after A/D conversion, and judge whether the amplitude of detection signal reaches output voltage preset value, if the amplitude of detection signal reaches voltage preset value, then judge that output power of power supply and output current normally export, export control signal, to continue as load supplying, if the amplitude of detection signal is less than output voltage preset value, then judge that output power of power supply exceedes power output preset value, output current exceedes output current preset value, then do not export control signal, and output voltage of cutting off the electricity supply exports.
Particularly; output control circuit 250 comprises the 5th electric capacity C5, the 6th electric capacity C6, detection tube D11, protection tube D12, the 3rd triode Q3, relay TLY1 and auxiliary power supply end VCC; in the present embodiment; 3rd triode Q3 is NPN type triode; the internal structure of detection tube D11 is formed by the diodes in parallel that two conducting directions are contrary, and the internal structure of protection tube D12 is formed by the diodes in parallel that two conducting directions are identical.
Wherein, one end of the 5th electric capacity C5 is connected with the control end HEAT of controller 240, and the other end of the 5th electric capacity C5 is connected with the input of detection tube D11; 6th electric capacity C6 is connected between first output of detection tube D11 and the second output, and one end the 8th resistance R8 of the 6th electric capacity C6, be connected with the base stage of the 3rd triode Q3, the 8th resistance R8 is the other end ground connection of the base stage current-limiting resistance of the 3rd triode Q3, the 6th electric capacity C6; The grounded emitter of the 3rd triode Q3, the collector electrode of the 3rd triode Q3 is connected with the input of protection tube D12 through the 9th resistance R9, and is connected with one end of relay TLY1 through the tenth resistance R10; The other end of relay TLY1 is all connected with auxiliary power supply end VCC with the output of protection tube D12; One contact of relay TLY1 is connected with the secondary coil of transformer T1, and another contact of relay TLY1 is connected with load supplying end 300.
In the present embodiment; from the control signal that controller 240 exports, through the logical interchange stopping direct current effect of the 5th electric capacity C5, after exporting the control signal of interchange to detection tube D11; be that the 6th electric capacity C6 charges; produce direct current at the 6th electric capacity C6 two ends, drive the 3rd triode Q3 conducting, the contact adhesive of control relay TLY1; to load out-put supply output voltage; for load supplying, the coil of protection tube D12 protection relay TLY1, makes it not be burned.The present embodiment is not when controller 240 works because of fault, and relay TLY1 quits work immediately, and off-state is recovered in the contact of relay TLY1, cuts off load supplying, ensures the safe handling of fresh-keeping device.
In the present embodiment, the operation principle of fresh-keeping device power control circuit 200 specifically describes as follows:
When connecting alternating current, alternating current inputs from power input 100, after the rectification of input rectifying filter circuit 210, alternating current is converted to direct current, and after filtering the power input voltage of the direct current of stable output to drive circuit 220, when power input voltage reaches the pressure drop making bidirectional diode DA1 conducting, bidirectional diode DA1 conducting, power input voltage is added to the base stage of the first triode Q1, drives the second triode Q2 conducting, the tertiary coil TA3 of inductor TA there is the electric current of both forward and reverse directions to alternately pass through, at the first coil TA1 of inductor TA and the drive singal of the second coil TA2 generation out of phase, driven first triode Q1 and the second triode Q2 conducting, maintain drive circuit 220 to work, driver output electric power output voltage, voltage detecting circuit 230 pairs of electric power output voltages detect, first by electric power output voltage through the rectification of output rectification filter unit 231 and filtering, the electric power output voltage of interchange is converted to direct current, in detecting unit 232, pass through the dividing potential drop effect of the 6th resistance R6 and the 7th resistance R7 again, detection signal is exported to the A/D mouth of controller 240, this detection signal is read after controller 240 carries out A/D conversion process, and judge whether the amplitude of detection signal exceedes output voltage preset value, if the amplitude of detection signal reaches voltage preset value, then judge that output power of power supply and output current normally export, export control signal, after the detection tube D11 detection in output control circuit 250, be that the 6th electric capacity C6 charges, the control signal of direct current is produced at the 6th electric capacity C6 two ends, be added to the base stage of the 3rd triode Q3, drive the 3rd triode Q3 conducting, the contact adhesive of relay TLY1, the electric power output voltage that transformer T1 primary coil exports, be load supplying by load supplying end 300, if the amplitude of detection signal is less than output voltage preset value, then judge that output power of power supply exceedes power output preset value, output current exceedes output current preset value, then controller 240 does not export control signal, the 3rd triode Q3 is driven to end, the contact of relay TLY1 disconnects, and output voltage of cutting off the electricity supply exports to load, reaches and controls the power output of fresh-keeping device power supply and the object of output current.
The fresh-keeping device power control circuit 200 that the present invention proposes, carries out rectification by input rectifying filter circuit 210 by the power input voltage of interchange, is converted to direct current; Drive circuit 220 according to the power input voltage of direct current, driver output electric power output voltage; Voltage detecting circuit 230 detects electric power output voltage, and output detection signal; Controller 240 reads detection signal, and according to the amplitude of detection signal, exports control signal; Output control circuit 250, according to control signal, controls electric power output voltage and exports to load.The present invention increases voltage detecting circuit 230 at power output end, the power output of fresh-keeping device power supply is maintained and is less than 100W, output current maintains and is less than 8A simultaneously, realize the power output and the output current that control fresh-keeping device power supply in real time, make fresh-keeping device power supply meet the requirement of UL1310CLASSTWO safety certification.Simultaneously circuit of the present invention and apparatus structure simple and reliable, be easy to realize.
The present invention also proposes a kind of fresh-keeping device power control, this fresh-keeping device power control comprises fresh-keeping device power control circuit, the circuit structure of this fresh-keeping device power control circuit is identical with operation principle with the circuit structure of fresh-keeping device power control circuit 200 described above with operation principle, repeats no more herein.
The present invention also proposes a kind of control method of fresh-keeping device power control further.
With reference to the schematic flow sheet that Fig. 4 and Fig. 5, Fig. 4 are the control method preferred embodiment of fresh-keeping device power control of the present invention; Fig. 5 is the schematic flow sheet of control method step S30 mono-embodiment of fresh-keeping device power control of the present invention.
In the embodiment of the present invention, the control method of fresh-keeping device power control comprises the following steps:
Step S10: the power input voltage of interchange is carried out rectification by input rectifying filter circuit, is converted to direct current;
Step S20: drive circuit according to the power input voltage of direct current, driver output electric power output voltage;
Step S30: voltage detecting circuit detects electric power output voltage, and output detection signal;
Step S40: controller reads detection signal, and according to the amplitude of detection signal, export control signal;
Step S50: output control circuit, according to control signal, controls electric power output voltage and exports to load.
Preferably, step S30 comprises:
Step S31: the electric power output voltage of interchange is carried out rectification by output rectification filter unit, is converted to direct current;
Step S32: the electric power output voltage of detecting unit to direct current detects, output detection signal.
The control method of the fresh-keeping device power control that the present invention proposes, carries out rectification by input rectifying filter circuit by the power input voltage of interchange, is converted to direct current; Drive circuit according to the power input voltage of direct current, driver output electric power output voltage; Voltage detecting circuit detects electric power output voltage, and output detection signal; Controller reads detection signal, and according to the amplitude of detection signal, exports control signal; Output control circuit, according to control signal, controls electric power output voltage and exports to load.The control method simple possible that the present invention proposes, voltage detecting circuit is increased at power output end, can the control program of online modification controller, the power output of fresh-keeping device power supply is maintained and is less than 100W, output current maintains and is less than 8A simultaneously, realize the power output and the output current that control fresh-keeping device power supply in real time, make fresh-keeping device power supply meet the requirement of UL1310CLASSTWO safety certification.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a fresh-keeping device power control circuit, is connected between power input and load supplying end, comprises input rectifying filter circuit, drive circuit, controller and output control circuit, it is characterized in that, also comprise voltage detecting circuit;
The input of described input rectifying filter circuit is connected with described power input, the output of described input rectifying filter circuit is connected with the input of described drive circuit, and the output of described drive circuit is connected with the input of described voltage detecting circuit and the input of described output control circuit respectively; The output of described voltage detecting circuit is connected with the test side of described controller, and the control end of described controller is connected with the control end of described output control circuit, and the output of described output control circuit is connected with described load supplying end; Wherein:
Described input rectifying filter circuit is used for the power input voltage of interchange to carry out rectification, is converted to direct current;
Described drive circuit is used for the described power input voltage according to direct current, driver output electric power output voltage;
Described voltage detecting circuit is for detecting described electric power output voltage, and output detection signal;
Described controller for reading described detection signal, and according to the amplitude of described detection signal, exports control signal;
Described output control circuit is used for according to described control signal, controls described electric power output voltage and exports to load;
Described voltage detecting circuit comprises output rectification filter unit and detecting unit; The input of described output rectification filter unit is as the input of described voltage detecting circuit, be connected with the output of described drive circuit, the output of described output rectification filter unit is connected with the input of described detecting unit, the output of described detecting unit, as the output of described voltage detecting circuit, is connected with the test side of described controller; Wherein: described output rectification filter unit is used for the described electric power output voltage exchanged to carry out rectification, is converted to direct current; Described detecting unit is used for detecting the described electric power output voltage of direct current, output detection signal;
Described detecting unit comprises the 6th resistance, the 7th resistance and limiter tube; One end of described 6th resistance, as the input of described detecting unit, is connected with the output of described output rectification filter unit; One end of described 7th resistance is connected with the other end of described 6th resistance, and as the output of described detecting unit, is connected, the other end ground connection of described 7th resistance with the test side of described controller; Described limiter tube is connected with described 6th resistance and the common port of the 7th resistance, the test side of described controller respectively, for carrying out clamper to described detection signal.
2. fresh-keeping device power control circuit as claimed in claim 1, it is characterized in that, described input rectifying filter circuit comprises fuse, piezo-resistance, the first diode, the second diode, the 3rd diode, the 4th diode, the first resistance, the second resistance and the first electric capacity; Wherein:
One end of described fuse is connected with the live wire end of described power input, and the other end of described fuse is connected through the zero line side of described piezo-resistance with described power input; Described first diode and described second Diode series branch road and described 3rd diode and described 4th Diode series branch circuit parallel connection, and be connected across between the live wire end of described power input and zero line side, the conducting direction of described first diode and described second diode is contrary, and the conducting direction of described 3rd diode and described 4th diode is contrary; Described first resistance is in parallel with described second resistance and described first capacitive series branch, described first resistance is connected with the common port of described first diode and described second diode with the common port of described second resistance, and described first resistance is connected with the common port of described 3rd diode and described 4th diode with the common port of described first electric capacity.
3. fresh-keeping device power control circuit as claimed in claim 2, it is characterized in that, described drive circuit comprises a bidirectional diode, the first triode, the second triode, the 3rd resistance, the 4th resistance, the 5th diode, the 6th diode, the second electric capacity, the 3rd electric capacity, an inductor and a transformer; Wherein:
The collector electrode of described first triode is connected with the common port of described first resistance and described second resistance, between the base stage that first coil of described 3rd resistance and described inductor is connected to described first triode after mutually connecting and emitter, described 5th diode is connected between the collector and emitter of described first triode; Between the base stage that second coil of described 4th resistance and described inductor is connected to described second triode after mutually connecting and emitter, described 6th diode is connected between the collector and emitter of described second triode; The input of described bidirectional diode is connected with the common port of described first resistance and described first electric capacity, and the common port of the second coil of output and described 4th resistance and described inductor is connected; One end of the primary coil of described transformer is through the tertiary coil of described inductor, be connected with the emitter of described first triode and the collector electrode of described second triode respectively, the other end of the primary coil of described transformer is connected through the collector electrode of described second electric capacity with described first triode, and is connected with the emitter of described second triode through described 3rd electric capacity; The two ends of the secondary coil of described transformer are connected with the input of described voltage detecting circuit.
4. fresh-keeping device power control circuit as claimed in claim 3, it is characterized in that, described output rectification filter unit comprises the 7th diode, the 8th diode, the 9th diode, the tenth diode, the 4th electric capacity and the 5th resistance; Wherein:
Described 7th diode and described 8th Diode series branch road and described 9th diode and described tenth Diode series branch circuit parallel connection, and be connected across the two ends of described transformer secondary coil, the conducting direction of described 7th diode and described 8th diode is contrary, and the conducting direction of described 9th diode and described tenth diode is contrary; One end of described 4th electric capacity is connected with the common port of described 7th diode and described 8th diode, and the other end is connected with the common port of described 9th diode and described tenth diode; Described 5th resistance and described 4th Capacitance parallel connection, a common port, as the output of described output rectification filter unit, is connected with the input of described detecting unit, another common end grounding.
5. the fresh-keeping device power control circuit as described in claim 3 or 4, is characterized in that, described output control circuit comprises the 5th electric capacity, the 6th electric capacity, a detection tube, a protection tube, the 3rd triode, a relay and auxiliary power supply end; Wherein:
One end of described 5th electric capacity is connected with the control end of described controller, and the other end is connected with the input of described detection tube; Described 6th electric capacity is connected between the first output of described detection tube and the second output, and one end of described 6th electric capacity is connected with the base stage of described 3rd triode, other end ground connection; The grounded emitter of described 3rd triode, the collector electrode of described 3rd triode is connected with the input of described protection tube and one end of described relay respectively; The other end of described relay is all connected with described auxiliary power supply end with the output of described protection tube; One contact of described relay is connected with the secondary coil of described transformer, and another contact is connected with described load supplying end.
6. a fresh-keeping device power control, is characterized in that, comprises the fresh-keeping device power control circuit according to any one of claim 1 to 5.
7. a control method for fresh-keeping device power control as claimed in claim 6, is characterized in that, comprise the following steps:
Step S10: the power input voltage of interchange is carried out rectification by input rectifying filter circuit, is converted to direct current;
Step S20: drive circuit according to the described power input voltage of direct current, driver output electric power output voltage;
Step S30: voltage detecting circuit detects described electric power output voltage, and output detection signal;
Step S40: controller reads described detection signal, and according to the amplitude of described detection signal, export control signal;
Step S50: output control circuit, according to described control signal, controls described electric power output voltage and exports to load;
Described step S30 comprises:
Step S31: the described electric power output voltage exchanged is carried out rectification by output rectification filter unit, is converted to direct current;
Step S32: the described electric power output voltage of detecting unit to direct current detects, output detection signal.
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| CN201210539396.8A CN103051206B (en) | 2012-12-13 | 2012-12-13 | Fresh-keeping device power control circuit, device and control method thereof |
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| CN201210539396.8A CN103051206B (en) | 2012-12-13 | 2012-12-13 | Fresh-keeping device power control circuit, device and control method thereof |
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| CN105992432B (en) * | 2015-02-05 | 2018-09-04 | 台达电子工业股份有限公司 | Power circuit applied to LED load |
| CN107656130B (en) * | 2017-10-31 | 2024-04-26 | 佛山市赛扬电子科技有限公司 | Detection circuit for detecting weak direct current conductive characteristic by using alternating current signal |
| CN110022076A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | A kind of rectification power circuit |
| CN112003479B (en) * | 2020-09-01 | 2021-07-30 | 中车青岛四方车辆研究所有限公司 | Digital quantity acquisition circuit and acquisition method |
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