CN104104227A - Non-isolated power supply for refrigerator main control panel, refrigerator main control panel and refrigerator - Google Patents
Non-isolated power supply for refrigerator main control panel, refrigerator main control panel and refrigerator Download PDFInfo
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- CN104104227A CN104104227A CN201410345623.2A CN201410345623A CN104104227A CN 104104227 A CN104104227 A CN 104104227A CN 201410345623 A CN201410345623 A CN 201410345623A CN 104104227 A CN104104227 A CN 104104227A
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Abstract
The invention provides a non-isolated power supply for a refrigerator main control panel. The non-isolated power supply comprises a rectification unit for converting an input alternating current to a direct current, an input filter unit for filtering the direct current received from the rectification unit, a converter unit comprising a DC/DC converter, a power supply and voltage stabilization unit for providing a stable voltage for the converter unit, a follow current unit for keeping the output continuing of the current when a switch component in the DC/DC converter is switched off, and a feedback unit capable of providing a feedback signal about an output voltage for the converter unit so as to control the switch-on and switch-off of the switch component, wherein the output end of the input filter unit is connected with the converter unit, the input end of the follow current unit is connected with the converter unit, the output end of the follow current unit is connected with the input end of the feedback unit, the output end of the feedback unit is connected with the converter unit, the power supply and voltage stabilization unit is connected with the converter unit, and the output end of the follow current unit is the output end of the non-isolated power supply. The invention further provides a refrigerator main control panel and a refrigerator.
Description
Technical field
The present invention relates to power technique fields, more specifically, relate to a kind of non-insulating power supply for refrigerator master control borad, and there is master control borad and the refrigerator of this non-insulating power supply.
Background technology
Master control borad is a critical component in refrigerator and other household electrical appliance, and it implements the major function of the household electrical appliance such as refrigerator, and power supply in master control borad is master control borad power supply.
At present, non-insulating power supply (non-isolated power) has been used in master control borad.Non-insulating power supply refers between input and load end and does not carry out electrical isolation by transformer, but directly connection, input and load end are altogether.
In prior art, to the non-insulating power supply scheme of DC-DC, application has had some development, is the direct voltage dropping power supply of non-isolation and wherein use maximum.But it is mostly smaller that the band of existing technical scheme carries power, for example, below 5W, and peripheral cell is more complicated, and security reliability is unstable, has therefore limited the use of non-insulating power supply.
Therefore be necessary to study a kind of new non-insulating power supply, it can be realized large band and carries power, and cellular construction is simple, safe.
Summary of the invention
For addressing the above problem, according to a first aspect of the invention, provide a kind of non-insulating power supply for refrigerator master control borad, it is characterized in that, comprising:
The alternating current of input is converted into galvanic rectification unit;
Carry out the input filter unit of filtering to being received from the direct current of described rectification unit;
Converter unit, it comprises a DC/DC transducer;
For power supply and the voltage regulation unit of burning voltage are provided to described converter unit;
For keeping electric current to continue the afterflow unit of output in the time that the switch element of described DC/DC transducer disconnects; And
Feedback unit, it can provide feedback signal about output voltage to control switching on and off of described switch element to described converter unit,
The output of wherein said input filter unit is connected with described converter unit, the input of described afterflow unit is connected with described converter unit, the output of described afterflow unit is connected with the input of described feedback unit, the output of described feedback unit is connected with described converter unit, described power supply is connected with described converter unit with voltage regulation unit, the output that the output of wherein said afterflow unit is described non-insulating power supply.
According to first aspect present invention preferred embodiment, described switch element is MOSFET.
According to first aspect present invention preferred embodiment, also comprise protected location, this protected location is arranged on the input of described non-insulating power supply, and the output of this protected location is connected to the input of described rectification circuit.
According to first aspect present invention preferred embodiment, also comprise output voltage regulation unit, the input of this output voltage regulation unit is connected with the output of described afterflow unit.
According to first aspect present invention preferred embodiment, also comprise output filtering unit, the input of this output filtering unit is connected with the output of this output voltage regulation unit.
According to first aspect present invention preferred embodiment, this rectification unit is made up of half-wave rectifying circuit.
According to first aspect present invention preferred embodiment, this input filter unit is made up of π type filter circuit.
According to first aspect present invention preferred embodiment, this power supply and voltage regulation unit comprise a capacitor and a diode, it is extreme that wherein the negative pole of this diode and one end of this capacitor are connected to the power supply of described converter unit, the positive pole of this diode is connected with the output of described non-insulating power supply, and the other end of this capacitor is connected to the ground end of described converter unit.
According to first aspect present invention preferred embodiment, this afterflow unit comprises a diode, a resistor and an inductor, when switch element in described DC/DC transducer disconnects, electric current flow to described resistor from described diode, then flow to described inductor, finally flow to the output of described non-insulating power supply.
According to first aspect present invention preferred embodiment, this feedback unit comprises the first resistor, the second resistor, an optocoupler and a capacitor, wherein this first resistor is connected with this second resistor in series, and one end of this first resistor is connected to the output of described non-insulating power supply, this second resistor, this optocoupler and this Parallel-connected Capacitor connect, and one end of this capacitor is connected to the feedback end of described converter unit, the other end of this capacitor is connected to the ground end of described converter unit.
According to first aspect present invention preferred embodiment, described output voltage regulation unit comprises a capacitor, and this Parallel-connected Capacitor is at the output of described non-insulating power supply.
According to first aspect present invention preferred embodiment, described output filtering unit comprises a capacitor, and this Parallel-connected Capacitor is at the output of described non-insulating power supply.
According to a second aspect of the invention, provide a kind of refrigerator master control borad, it comprises above-mentioned non-insulating power supply.
According to a third aspect of the invention we, provide a kind of refrigerator, it comprises above-mentioned refrigerator master control borad.
Compared with prior art, the present invention at least has the following advantages: the present invention can provide larger power output capacity, and cost is low, simple in structure, reliability is high.
Brief description of the drawings
Fig. 1 is the block diagram of non-insulating power supply according to an embodiment of the invention;
Fig. 2 is the part-structure block diagram that non-insulating power supply is according to an embodiment of the invention shown;
Fig. 3 is the concrete structure figure of non-insulating power supply according to an embodiment of the invention;
Fig. 4 is the schematic diagram of refrigerator electric control plate according to an embodiment of the invention;
Fig. 5 is refrigerator schematic diagram according to an embodiment of the invention.
Should be understood that accompanying drawing only draws for illustrative purposes, should not be considered as is limitation of the present invention.
Embodiment
According to a first aspect of the invention, non-insulating power supply comprises: the alternating current of input is converted into galvanic rectification unit, carry out the input filter unit of filtering to being received from the direct current of described rectification unit, converter unit, it comprises a DC/DC transducer, for power supply and the voltage regulation unit of burning voltage are provided to described converter unit, for keeping electric current to continue the afterflow unit of output in the time that the switch element of described DC/DC transducer disconnects, and feedback unit, it can provide feedback signal about output voltage to control switching on and off of described switch element to described converter unit, the output of wherein said input filter unit is connected with described converter unit, the input of described afterflow unit is connected with described converter unit, the output of described afterflow unit is connected with the input of described feedback unit, the output of described feedback unit is connected with described converter unit, described power supply is connected with described converter unit with voltage regulation unit, the output that the output of wherein said afterflow unit is described non-insulating power supply.
Preferably, DC/DC transducer in converter unit can adopt BM2P054F type DC/DC transducer, wherein, the first output of input filter unit is connected to the drain electrode end of transducer, and the second output of input filter unit is connected to the earth terminal of non-insulating power supply.The first input end of afterflow unit is connected to the source terminal of transducer, the second input of afterflow unit is connected to the earth terminal of non-insulating power supply, the 3rd end of afterflow unit is connected to the ground end of transducer, and the output of afterflow unit is as the output of non-insulating power supply.Power supply and the first end of voltage regulation unit are connected to that the power supply of transducer is extreme, and the second end of power supply and voltage regulation unit is connected to the ground end of transducer, and the 3rd end of power supply and voltage regulation unit is connected to the output of afterflow unit.The first end of feedback unit is connected to the output of afterflow unit, and the second end of feedback unit is connected to the feedback end of transducer, and the 3rd end of feedback unit is connected to the ground end of transducer.
According to a second aspect of the invention, provide a kind of refrigerator master control borad, this refrigerator master control borad comprises non-insulating power supply of the present invention.
According to a third aspect of the invention we, provide a kind of refrigerator, this refrigerator comprises above-mentioned refrigerator master control borad.
Further describe each embodiment of the present invention below in conjunction with accompanying drawing.In institute's drawings attached, same or analogous label represents same or analogous element or has the element of same or similar function.Should be understood that the embodiment describing below in conjunction with accompanying drawing is only exemplary, be intended to for explaining the present invention, and be not intended to limit the present invention.
In this article, the sequence words such as term " first ", " second ", " the 3rd ", " the 4th " are only for convenience, do not limit the scope of protection of present invention.
Referring to Fig. 1, this figure is the block diagram of non-insulating power supply 100 according to an embodiment of the invention.
As shown in Figure 1, non-insulating power supply 100 according to an embodiment of the invention comprises rectification unit 102, input filter unit 103, converter unit 104, power supply and voltage regulation unit 106, afterflow unit 105 and feedback unit 107.Wherein the output of rectification unit 102 is connected to the input of input filter unit 103, the output of input filter unit 103 is connected to converter unit 104, and converter unit 104 is also connected with power supply and voltage regulation unit 106, afterflow unit 105 and feedback unit 107.The input of afterflow unit 105 is connected with converter unit 104, the output of afterflow unit 105 is connected with the input of feedback unit 107, the output of feedback unit 107 is connected with converter unit 104, power supply is connected with converter unit 104 with voltage regulation unit 106, and wherein the output of afterflow unit 105 is the output of non-insulating power supply 100.
Preferably, as shown in Figure 1, non-insulating power supply 100 also can comprise protected location 101.The input of protected location 101 is as the input of non-insulating power supply 100, and the output of protected location 101 is connected to the input of rectification unit 102.Non-insulating power supply 100 also can comprise output voltage regulation unit 108, and the input of output voltage regulation unit 108 is connected with the output of afterflow unit 105, and the output of output voltage regulation unit 108 can be used as the output of non-insulating power supply 100.Non-insulating power supply 100 also can comprise output filtering unit 109, and the input of output filtering unit 109 is connected with the output of output voltage regulation unit 108, and the output of output filtering unit 109 is as the output of non-insulating power supply 100.
Described protected location 101 is protected described non-insulating power supply 100, to prevent that excessive curtage etc. from causing damage to described non-insulating power supply 100.
The interchange of input is converted into direct current by described rectification unit 102, realized the conversion of AC-DC.
The direct current that described input filter unit 103 is exported rectification unit 102 carries out filtering.
Described converter unit 104 comprises DC/DC transducer, preferably PWM DC/DC transducer.
The switch element of described afterflow unit 105 in described converter unit 104 keeps electric current to continue output while closing.
Described power supply and voltage regulation unit 106 are realized power supply and the voltage stabilizing to converter unit 104.
Output voltage is fed back to converter unit 104 by described feedback unit 107, regulates the operation of converter unit 104.
Described output voltage regulation unit 108 regulated output voltages.
Described output filtering unit 109 carries out filtering to output voltage.
Should be understood that non-insulating power supply of the present invention is not to comprise above-mentioned all unit or unit, it can only comprise a part of unit or unit.In addition, non-insulating power supply of the present invention also can comprise other unit or the unit in this specification, do not described.
As described above, described converter unit 104 comprises DC/DC transducer, preferably, DC/DC transducer adopts the BM2P054F type DC/DC transducer of Rohm company, as shown in Figure 2, wherein the first output of input filter unit 103 is connected to the drain electrode end (D end) of transducer, and the second output of input filter unit 103 is connected to the earth terminal of non-insulating power supply 100.The first input end of afterflow unit 105 is connected to the source terminal (S end) of transducer, the second input of afterflow unit 105 is connected to the earth terminal of non-insulating power supply 100, the 3rd end of afterflow unit 105 is connected to the ground end (GND end) of transducer, and the output of afterflow unit 105 is as the output of non-insulating power supply 100.The first end of power supply and voltage regulation unit 106 is connected to the power supply extreme (VCC end) of transducer, and the second end of power supply and voltage regulation unit 106 is connected to the ground end of transducer, and the 3rd end of power supply and voltage regulation unit is connected to the output of afterflow unit 105.The first end of feedback unit 107 is connected to the output of afterflow unit 105, and the second end of feedback unit 107 is connected to the feedback end (FB end) of transducer, and the 3rd end of feedback unit 107 is connected to the ground end of transducer.
Fig. 3 is the concrete structure figure of non-insulating power supply according to an embodiment of the invention, and it shows each part of non-insulating power supply 100.
Alternatively, non-insulating power supply is provided with protected location 101, and it is arranged on the input of power supply, is made up of fuse F1, piezo-resistance RV1 and capacitor CX2.Wherein after piezo-resistance RV1 and capacitor CX2 parallel connection, connect with fuse F1.The first end of fuse F1 is as the first input end of non-insulating power supply 100, and the second end of fuse F1 is connected with the first end of piezo-resistance RV1 with capacitor CX2.The second end of capacitor CX2 and piezo-resistance RV1 is as the second input of non-insulating power supply 100.This protected location can play over-current over-voltage protection.But should be understood that other suitable protected locations are also feasible.
Rectification unit 102 is made up of common mode inductance FL1, thermistor RT1, diode D1 and D2.The first end of the capacitor CX2 of the first input end of common mode inductance FL1 and protected location 101; the first output that is protected location 101 is connected; the second end of the second input of common mode inductance FL1 and the capacitor CX2 of protected location 101, the second output of protected location 101 is connected.Should be understood that in the time protected location not being set in power supply, the first input end of common mode inductance FL1 is as the first input end of non-insulating power supply 100, and the second input of common mode inductance FL1 is as the second input of non-insulating power supply 100.The first output of common mode inductance FL1 is connected with the positive pole of diode D1, and the second output of common mode inductance FL1 is connected with the first end of thermistor RT1.The second end of thermistor RT1 is connected with the negative pole of diode D2.The negative pole of diode D1 is as the first output of rectification unit 102, and the positive pole of diode D2 is as the second output of rectification unit 102.In rectification unit 102, common mode inductance FL1 eliminates common mode disturbances, thermistor RT1 surge current suppression.In this embodiment, the rectification unit 102 adopting is to utilize two diode D1 and D2 to realize halfwave rectifier, but the invention is not restricted to this, and full-wave rectification unit, bridge rectifier unit etc. is all applicable to the present invention.
Input filter unit 103 is made up of capacitor CE1, CE2 and inductor L1.The first end of capacitor CE1 is connected to the negative pole of the diode D1 in rectification unit 102 as the first input end of input filter unit 103, the second end of capacitor CE1 is connected to the positive pole of the diode D2 in rectification unit 102 as the second input of input filter unit 103.The first end of inductor L1 is connected to the negative pole of the diode D1 in rectification unit 102, and the second end of inductor L1 is connected to the first end of capacitor CE2, and the second end of capacitor CE2 is connected to the second end of capacitor CE1.The first end of capacitor CE2 is the first output of input filter unit 103, and the second end of capacitor CE2 is the second output of input filter unit 103.In this embodiment, input filter unit 103 is the filtering of π type, and the interchange cost that filtering is unnecessary and other harmonic waves, also play input pressure stabilization function.Similarly, non-insulating power supply of the present invention also can use the filter unit of other types.Preferably, capacitor CE1, CE2 adopt polarity electrolytic capacitor.
Converter unit 104 receives the filtered more smooth direct current from described input filter unit 103.Converter unit 104 can comprise DC/DC transducer.In this embodiment, taking the BM2P054F cake core of Rohm as example, but should be understood that the present invention also can adopt the DC/DC transducer of other types.As shown in Figure 3, filtered direct current is input to the drain electrode end D end of transducer, and the first end of drain electrode end D end and capacitor CE2, is connected with the first output of input filter unit 103.The source terminal S end of Rohm chip is connected with the first end of the resistance R 101 in afterflow unit 105 and the negative pole of sustained diode 3, be connected with the first input end of afterflow unit 105, the electric current that flows into source S is Ics=0.4V/Rcs, Rcs is current-limiting resistance, in this embodiment, current-limiting resistance is resistance R 101.The earth terminal GND of Rohm chip is floating ground, and it is connected to the second end of resistor R101.The feedback end FB of Rohm chip is connected to the capacitor C101 in feedback unit 107, and capacitor C101 will be described hereinafter, and the magnitude of voltage at feedback end FB place is determined the operating state of Rohm chip.The extreme VCC of power supply of Rohm chip is connected to the negative pole of diode D4 and the first end of capacitor CE4 in power supply and voltage regulation unit 106, and diode D4 and capacitor CE4 will be described hereinafter.
Between drain electrode end D end and source terminal S end, be provided with switch element MOSFET (not shown), MOSFET plays on-off action.In the time that MOSFET opens, electric current flows into from drain electrode end D end, and from the output of source terminal S end, through resistor, R101 exports output to.When output voltage too high, during higher than normal output voltage, the voltage on the feedback resistance R103 in feedback unit 107 raises, and the voltage at 1, the 2 terminal two ends of optocoupler IC2 increases, thereby make 3, the 4 end conductings of optocoupler IC2, and then the voltage of feedback end FB end is raise.The voltage of FB end raises MOSFET is disconnected, and now electric current flow to the diode D3 of afterflow unit 105 from the ground end of power supply 100, then flow to the output of power supply 100 through resistance R 101, inductor L3.After output end voltage drops to normal output voltage, MOSFET opens, and this process repeats, thereby keeps the stable of output voltage.
Afterflow unit 105 comprises diode D3, resistor R101 and inductor L3.Diode D3 for making electric current continue to flow in the time that MOSFET disconnects, and resistor R101 limits the electric current that flows into source terminal, and inductor L3 is for energy storage and voltage transitions.The first end of resistor R101 is connected to the negative pole of diode D3 as the first input end of afterflow unit 105, and is connected to the source terminal S end of transducer.The second end of resistor R101 is connected to the first end of inductor L3, and the second end of resistor R101 is also connected to the ground end GND end of transducer.The second end of inductor L3 can be used as the output of non-insulating power supply 100, and the positive terminal of diode D3 can be connected with the second input of input filter unit 103, and is connected with the earth terminal of non-insulating power supply 100.
As described above, in the time that MOSFET disconnects, afterflow unit 105 makes electric current continue to flow, and now the voltage of output remains on normal output voltage.
Power supply and voltage regulation unit 106 comprise diode D4 and capacitor CE4.The VCC end that power supply and voltage regulation unit 106 are converter unit 104 provides burning voltage, thereby ensures the normal operation of converter unit 104.The first end of the negative pole of diode D4 and capacitor CE4 is connected to the VCC end of transducer, and the second end of capacitor CE4 is connected to the GND end of transducer.The positive pole of diode D4 is connected to the output of non-insulating power supply 100.Preferably, capacitor CE4 adopts polarity electrolytic capacitor.
Feedback unit 107 comprises resistor R102 and R103, optocoupler IC2 and capacitor C101, and wherein resistor 102 and 103 arranges feedback voltage, and as explained above, and capacitor C101 is for stablizing feedback voltage in the effect of optocoupler IC2.Resistor R102 and R103 series connection, the first end of resistor R102 is connected to the output of non-insulating power supply 100, and the second end of R103 is connected to the second input of optocoupler.The second end of resistor R102 and the first end of R103 are connected to the first input end of optocoupler jointly, and the first output of optocoupler is connected to the GND end of transducer, and the second output of optocoupler is connected to the FB end of transducer.The first end of capacitor C101 is also connected to the FB end of transducer, and the second end of capacitor C101 is connected to the GND end of transducer.Preferably, feedback unit 107 also can comprise voltage stabilizing didoe ZD1, and the positive pole of this voltage stabilizing didoe ZD1 is connected to the earth terminal of non-insulating power supply 100, and negative pole is connected to the second input of optocoupler.
Output voltage regulation unit 108 comprises capacitor CE3, and output filtering unit 109 comprises capacitor CE9.The first end of capacitor CE3 and capacitor CE9 is connected to the output of non-insulating power supply 100, and the second end of capacitor CE3 and capacitor CE9 is connected to the earth terminal of non-insulating power supply 100.Preferably, capacitor CE3 and CE9 are electrolytic capacitors.
In addition, as shown in Figure 2, non-insulating power supply 100 also can comprise diode ZD2, carries out pressure limiting for the VCC end to Rohm chip.Diode ZD2 and CE4 are connected in parallel.
In addition, non-insulating power supply 100 also can comprise high-voltage capacitor CY1, and this capacitor is connected between drain electrode end and source terminal, for the overshoot voltage between drain electrode end and source terminal.
Can realize the output voltage of 8.9-26V according to the non-insulating power supply of above-mentioned embodiment of the present invention, and can be up to the power output of 10W.
Fig. 4 is the schematic diagram of refrigerator master control borad according to an embodiment of the invention.
As shown in Figure 4, refrigerator master control borad 300 according to the present invention comprises non-isolated power supply 100.
Fig. 5 is refrigerator schematic diagram according to an embodiment of the invention.
As shown in Figure 5, refrigerator 400 according to the present invention comprises refrigerator master control borad 300.
Should be understood that embodiment herein and embodiment only for illustrative purposes, do not departing under the prerequisite of claims limited range, those skilled in the art can make multiple remodeling and variant accordingly.
Claims (14)
1. for a non-insulating power supply for refrigerator master control borad, it is characterized in that, comprising:
The alternating current of input is converted into galvanic rectification unit;
Carry out the input filter unit of filtering to being received from the direct current of described rectification unit;
Converter unit, it comprises a DC/DC transducer;
For power supply and the voltage regulation unit of burning voltage are provided to described converter unit;
For keeping electric current to continue the afterflow unit of output in the time that the switch element of described DC/DC transducer disconnects; And
Feedback unit, it can provide feedback signal about output voltage to control switching on and off of described switch element to described converter unit,
The output of wherein said input filter unit is connected with described converter unit, the input of described afterflow unit is connected with described converter unit, the output of described afterflow unit is connected with the input of described feedback unit, the output of described feedback unit is connected with described converter unit, described power supply is connected with described converter unit with voltage regulation unit, the output that the output of wherein said afterflow unit is described non-insulating power supply.
2. non-insulating power supply according to claim 1, is characterized in that, described switch element is MOSFET.
3. non-insulating power supply according to claim 1 and 2, is characterized in that, also comprises protected location, and this protected location is arranged on the input of described non-insulating power supply, and the output of this protected location is connected to the input of described rectification circuit.
4. non-insulating power supply according to claim 1 and 2, is characterized in that, also comprises output voltage regulation unit, and the input of this output voltage regulation unit is connected with the output of described afterflow unit.
5. non-insulating power supply according to claim 4, is characterized in that, also comprises output filtering unit, and the input of this output filtering unit is connected with the output of this output voltage regulation unit.
6. non-insulating power supply according to claim 1 and 2, is characterized in that, this rectification unit is made up of half-wave rectifying circuit.
7. non-insulating power supply according to claim 1 and 2, is characterized in that, this input filter unit is made up of π type filter circuit.
8. non-insulating power supply according to claim 1 and 2, it is characterized in that, this power supply and voltage regulation unit comprise a capacitor and a diode, it is extreme that wherein the negative pole of this diode and one end of this capacitor are connected to the power supply of described converter unit, the positive pole of this diode is connected with the output of described non-insulating power supply, and the other end of this capacitor is connected to the ground end of described converter unit.
9. non-insulating power supply according to claim 1 and 2, it is characterized in that, this afterflow unit comprises a diode, a resistor and an inductor, when switch element in described DC/DC transducer disconnects, electric current flow to described resistor from described diode, then flow to described inductor, finally flow to the output of described non-insulating power supply.
10. non-insulating power supply according to claim 1 and 2, it is characterized in that, this feedback unit comprises the first resistor, the second resistor, an optocoupler and a capacitor, wherein this first resistor is connected with this second resistor in series, and one end of this first resistor is connected to the output of described non-insulating power supply, this second resistor, this optocoupler and this Parallel-connected Capacitor connect, and one end of this capacitor is connected to the feedback end of described converter unit, the other end of this capacitor is connected to the ground end of described converter unit.
11. non-insulating power supplies according to claim 4, is characterized in that, described output voltage regulation unit comprises a capacitor, and this Parallel-connected Capacitor is at the output of described non-insulating power supply.
12. non-insulating power supplies according to claim 5, is characterized in that, described output filtering unit comprises a capacitor, and this Parallel-connected Capacitor is at the output of described non-insulating power supply.
13. 1 kinds of refrigerator master control borads, is characterized in that, comprise according to the non-insulating power supply described in claim 1-12 any one.
14. 1 kinds of refrigerators, is characterized in that, comprise refrigerator master control borad according to claim 13.
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| CN201410345623.2A CN104104227A (en) | 2014-07-18 | 2014-07-18 | Non-isolated power supply for refrigerator main control panel, refrigerator main control panel and refrigerator |
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| CN201410345623.2A CN104104227A (en) | 2014-07-18 | 2014-07-18 | Non-isolated power supply for refrigerator main control panel, refrigerator main control panel and refrigerator |
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| CN204030957U (en) * | 2014-07-18 | 2014-12-17 | 合肥美的电冰箱有限公司 | A kind of non-isolated power supply for refrigerator master control borad, refrigerator master control borad and refrigerator |
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| CN105141117A (en) * | 2015-10-16 | 2015-12-09 | 珠海格力电器股份有限公司 | Control circuit and method for switching power supply |
| CN105141117B (en) * | 2015-10-16 | 2018-11-06 | 珠海格力电器股份有限公司 | Control circuit and method for switching power supply |
| CN105932892A (en) * | 2016-05-31 | 2016-09-07 | 中国电子科技集团公司第四十研究所 | Input-output common ground based high-voltage adjustable step-down circuit |
| CN110932543A (en) * | 2019-12-19 | 2020-03-27 | 珠海格力电器股份有限公司 | Filter and refrigerator |
| CN110932543B (en) * | 2019-12-19 | 2021-04-23 | 珠海格力电器股份有限公司 | Filter and refrigerator |
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Application publication date: 20141015 |