CN112467984A - Power supply carried by ice machine board - Google Patents
Power supply carried by ice machine board Download PDFInfo
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- CN112467984A CN112467984A CN202011125137.1A CN202011125137A CN112467984A CN 112467984 A CN112467984 A CN 112467984A CN 202011125137 A CN202011125137 A CN 202011125137A CN 112467984 A CN112467984 A CN 112467984A
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- capacitor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an ice machine onboard power supply, which comprises: one end of the fuse (F1) is used for connecting an L line of a 220V power supply; one end of a thermistor (RT1) is used for connecting with an N wire of the 220V power supply; the filter circuit is connected with the other end of the fuse (F1) and the other end of the thermistor (RT 1); the rectifier bridge is connected with the output end of the filter circuit; the withstand voltage of the electrolytic capacitor (C3) is not lower than 450V in the process that the anode of the electrolytic capacitor (C3) is connected with the positive output end of the rectifier bridge and the cathode of the rectifier bridge is connected with the reverse output end of the rectifier bridge; the power supply conversion circuit is connected with the electrolytic capacitor (C3). The ice machine on-board power supply can greatly avoid the bulge of the electrolytic capacitor.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to an on-board power supply of an ice making machine.
Background
Ice machine on-board power supplies sometimes suffer from ice burst and electrolytic capacitor bulge, but there is no effective countermeasure to this situation in the prior art.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an on-board power supply of an ice making machine, which can greatly avoid the bulge of an electrolytic capacitor.
In order to achieve the purpose, the invention provides an on-board power supply of an ice maker, which has the following structure: one end of the fuse (F1) is used for connecting an L line of a 220V power supply; one end of a thermistor (RT1) is used for connecting with an N wire of the 220V power supply; the filter circuit is connected with the other end of the fuse (F1) and the other end of the thermistor (RT 1); the rectifier bridge is connected with the output end of the filter circuit; the withstand voltage of the electrolytic capacitor (C3) is not lower than 450V in the process that the anode of the electrolytic capacitor (C3) is connected with the positive output end of the rectifier bridge and the cathode of the rectifier bridge is connected with the reverse output end of the rectifier bridge; the power supply conversion circuit is connected with the electrolytic capacitor (C3).
In one embodiment of the present invention, the power conversion circuit includes: one end of a first resistor (R1) is connected with the anode of the electrolytic capacitor (C3); one end of a first capacitor (C5) is connected with the other end of the first resistor (R1); the anode of the first diode (D1) is connected with the anode of the electrolytic capacitor (C3); one end of a second resistor (R4) is connected with the cathode of the first diode (D1), and the other end of the second resistor (R4) is connected with the other end of the first capacitor (C5); the cathode of the second diode (D3) is connected with the other end of the first capacitor (C5); one end of a third resistor (R3) is connected with the anode of the electrolytic capacitor (C3); one end of a fourth resistor (R5) is connected with the other end of the third resistor (R3); the primary side of the switching transformer (T1) comprises a first winding and a second winding, one end of the first winding is connected with the anode of the electrolytic capacitor (C3), the other end of the first winding is connected with the anode of the second diode (D3), one end of the second winding is grounded, and the secondary side of the switching transformer (T1) comprises a third winding, one end of the third winding is grounded; a switching power supply chip (IC1), wherein a first S end, a second S end, a third S end and a fourth S end of the switching power supply chip (IC1) are connected with the cathode of the electrolytic capacitor (C3), a D end of the switching power supply chip (IC1) is connected with the anode of the second diode (D3), and an EN/UV end of the switching power supply chip (IC1) is connected with the other end of the fourth resistor (R5); one end of a fifth resistor (R9) is connected with the BP/M end of the switch power supply chip (IC 1); one end of a sixth resistor (R8) is connected with the other end of the fifth resistor (R9); one end of a second capacitor (C6) is connected with one end of the second winding and is grounded, and the other end of the second capacitor (C6) is connected with the other end of the sixth resistor (R8); the cathode of the third diode (D4) is connected with the other end of the sixth resistor (R8); one end of a seventh resistor (R7) is connected to the anode of the third diode (D4), and the other end of the seventh resistor (R7) is connected to the other end of the second winding; the anode of the first zener diode (ZD1) is connected with one end of the fifth resistor (R9), and the cathode of the first zener diode (ZD1) is connected with the other end of the fifth resistor (R9); one end of a third capacitor (C12) is connected with the anode of the first voltage-stabilizing diode (ZD1), and the other end of the third capacitor (C12) is grounded; an emitter of a phototriode of the optocoupler IC2 is connected with a first S end, a second S end, a third S end and a fourth S end of the switching power supply chip (IC1) and is grounded, a collector of the phototriode is connected with an EN/UV end of the switching power supply chip (IC1), and a cathode of a light emitting diode of the optocoupler IC2 is grounded; one end of an eighth resistor (R11) is grounded, and the other end of the eighth resistor (R11) is connected with the anode of the optocoupler IC 2; one end of a ninth resistor (R10) is connected to the other end of the eighth resistor (R11); the anode of the second zener diode (ZD2) is connected with the other end of the ninth resistor (R10); the anode of a fourth diode (D2) is connected with the other end of the third winding, and the cathode of the fourth diode (D2) is connected with the cathode of the second zener diode (ZD 2); the anode of a fourth capacitor (C7) is connected with the cathode of the fourth diode (D2), and the cathode of the fourth capacitor (C7) is grounded; one end of a fifth capacitor (C1) is connected with one end of the first winding; one end of a sixth capacitor (C30) is connected with the other end of the fifth capacitor (C1), and the other end of the sixth capacitor (C30) is grounded; one end of a seventh capacitor (C9) is connected with the anode of the fourth capacitor (C7), and the other end of the seventh capacitor (C9) is grounded; the input end of a voltage amplifier (U1) is connected with one end of the seventh capacitor (C9), and the ground end of the voltage amplifier (U1) is grounded; the anode of an eighth capacitor (C10) is connected with the output end of the voltage amplifier (U1), and the other end of the eighth capacitor (C10) is grounded; one end of a ninth capacitor (C8) is connected with the anode of the eighth capacitor (C10), and the other end of the ninth capacitor (C8) is grounded.
In an embodiment of the invention, the turn ratio of the switching transformer (T1) is adjusted such that the amplitude of the maximum transient reflected pulse voltage of the first winding is lower than the withstand voltage of a MOS transistor between the first S terminal of the switching power supply chip (IC1) and the D terminal of the switching power supply chip (IC 1).
In one embodiment of the present invention, the turn ratio of the switching transformer (T1) is 8:1, the amplitude of the reflected pulse voltage between the other end of the first winding and the other end of the second winding is 488V, and the withstand voltage value of the MOS transistor between the first S terminal of the switching power supply chip (IC1) and the D terminal of the switching power supply chip (IC1) is 700V.
In an embodiment of the invention, a voltage of 5V is output between the ninth capacitor (C8) and the eighth capacitor (C10).
In one embodiment of the present invention, a 12V voltage can be output between the fourth capacitor (C7) and the fourth diode (D2).
In one embodiment of the present invention, a voltage of 310V can be output between the third resistor (R3) and the first diode (D1).
In one embodiment of the invention, the filter circuit comprises a tenth resistor (R2), a tenth capacitor (C4), an inductor (L1) and an eleventh capacitor (C2) which are connected in parallel with each other.
Compared with the prior art, according to the ice machine onboard power supply disclosed by the invention, when lightning strike voltage enters from the L-N end, after the lightning strike voltage passes through L1 and C2, the rising slope of the rapidly rising lightning strike voltage is slowed down and reduced, the impact voltage really applied to two ends of C3 is effectively reduced after the lightning strike voltage passes through a rectifier bridge BR1, and the customized 450V voltage-resistant electrolytic capacitor has excellent over-voltage and over-temperature resistance, so that the electrolytic capacitor can be prevented from being overheated and bulging or even being damaged when the electrolytic capacitor is struck by lightning or under the action of peripheral peak voltage. Preferably, the turn ratio of the switching transformer T1 is further adjusted so that the amplitude of the maximum transient reflected pulse voltage of the first winding is lower than the withstand voltage value of the MOS transistor between the first S terminal of the switching power supply chip and the D terminal of the switching power supply chip, so that the safety of the switching power supply chip IC1 can be protected, and the chip is prevented from being broken down by overvoltage or even explosion.
Drawings
FIG. 1 is a circuit diagram of an ice maker on-board power supply according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of a reflected pulse voltage under test according to an embodiment of the present invention;
fig. 3 is a waveform diagram of a reflected pulse voltage of a test according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
To overcome the problem of ice maker on-board power supply chip burst and electrolytic capacitor bulge, the inventors have conducted the following analysis.
First, FIG. 1 is a circuit diagram of an ice maker on-board power supply according to an embodiment of the present invention.
In the on-board power supply of the ice machine, an alternating current power supply is connected in from a circuit contact L and an N pin, is connected in series with a thermistor RT1 through a fuse (F1) and is connected to a filter circuit consisting of a resistor R2, a capacitor C4, an inductor L1 and a capacitor C2, is output to a rectifier bridge BRT, and is rectified and then added to two ends of a filter capacitor C3 to form a direct current power supply of the whole power conversion circuit.
The power conversion circuit has the following structure. One end of the resistor R1 is connected with the anode of the electrolytic capacitor C3; one end of the capacitor C5 is connected with the other end of the resistor R1; the anode of the diode D1 is connected with the anode of the electrolytic capacitor C3; one end of the resistor R4 is connected with the cathode of the diode D1, and the other end of the resistor R4 is connected with the other end of the capacitor C5; the cathode of the diode D3 is connected with the other end of the capacitor C5; one end of the resistor R3 is connected with the anode of the electrolytic capacitor C3; one end of the resistor R5 is connected with the other end of the resistor R3; the primary side of the switching transformer T1 includes a first winding and a second winding, one end of the first winding is connected to the anode of the electrolytic capacitor C3, the other end of the first winding is connected to the anode of the diode D3, one end of the second winding is grounded, and the secondary side of the switching transformer T1 includes a third winding, one end of the third winding is grounded; a first S end, a second S end, a third S end and a fourth S end of the switching power supply chip IC1 are connected with the cathode of the electrolytic capacitor C3, the D end of the switching power supply chip IC1 is connected with the anode of the diode D3, and the EN/UV end of the switching power supply chip IC1 is connected with the other end of the resistor R5; one end of the resistor R9 is connected with the BP/M end of the switch power supply chip IC 1; one end of the resistor R8 is connected with the other end of the resistor R9; one end of a capacitor C6 is connected with one end of the second winding and grounded, and the other end of the capacitor C6 is connected with the other end of the resistor R8; the cathode of the diode D4 is connected with the other end of the resistor R8; one end of the resistor R7 is connected with the anode of the diode D4, and the other end of the resistor R7 is connected with the other end of the second winding; the anode of the zener diode ZD1 is connected with one end of the resistor R9, and the cathode of the zener diode ZD1 is connected with the other end of the resistor R9; one end of a capacitor C12 is connected with the anode of the zener diode ZD1, and the other end of the capacitor C12 is grounded; an emitter of a phototriode of the optocoupler IC2 is connected with a first S end, a second S end, a third S end and a fourth S end of the switching power supply chip IC1 and is grounded, a collector of the phototriode is connected with an EN/UV end of the switching power supply chip IC1, and a cathode of a light emitting diode of the optocoupler IC2 is grounded; one end of the resistor R11 is grounded, and the other end of the resistor R11 is connected with the anode of the optocoupler IC 2; one end of the resistor R10 is connected with the other end of the resistor R11; the anode of the voltage-stabilizing diode ZD2 is connected with the other end of the resistor R10; the anode of the diode D2 is connected with the other end of the third winding, and the cathode of the diode D2 is connected with the cathode of the zener diode ZD 2; the anode of the capacitor C7 is connected with the cathode of the diode D2, and the cathode of the capacitor C7 is grounded; one end of the capacitor C1 is connected with one end of the first winding; one end of a capacitor C30 is connected with the other end of the capacitor C1, and the other end of the capacitor C30 is grounded; one end of a capacitor C9 is connected with the positive electrode of the capacitor C7, and the other end of the capacitor C9 is grounded; the input end of a voltage amplifier U1 is connected with one end of the capacitor C9, and the ground end of the voltage amplifier U1 is grounded; the anode of the capacitor C10 is connected with the output end of the voltage amplifier U1, and the other end of the capacitor C10 is grounded; one end of the capacitor C8 is connected with the positive electrode of the capacitor C10, and the other end of the capacitor C8 is grounded. Wherein, the switch power supply chip can be TNY278 PN. 5V voltage is output between the capacitor C8 and the capacitor C10. 12V voltage is output between the capacitor C7 and the diode D2. The 310V voltage can be output between the resistor R3 and the diode D1.
During actual use of the on-board power supply, there is a possibility that the switching power supply chip IC1 bursts and the electrolytic capacitor C3 bulges. Aiming at the problem, the inventor tests and analyzes the voltage waveforms at two ends of the electrolytic capacitor C3, thereby judging whether the voltage is abnormal, and considering whether the 12V and 5V loads output by the power supply are in no-load and full-load under the normal working condition, besides the ripple direct current obtained by rectifying the mains supply, pulse peak voltage reflected by a primary coil and a secondary coil of the switch transformer T1 also can exist at two ends of the electrolytic capacitor C3, so that the pulse peak voltage waveforms reflected by the primary coil and the secondary coil of the switch transformer T3 are tested in addition to testing the direct current voltage at two ends of the C3.
The tests were as follows: the input end of an on-board power supply is respectively applied with two inputs of extreme voltage 175Vac and 245Vdc, the DC voltage on an electrolytic capacitor C3 is 374V at the maximum, the peak waveform is 450V at the maximum, and the DC voltage is under the rated working voltage of an electrolytic capacitor C3 and a switching power supply chip IC1, so that the conclusion that the selected parameters are in a reasonable range is reached, the chip and the capacitor are in a normal and reasonable working range under 175Vac, the chip and the capacitor are in a normal and reasonable working range under the actual working condition, the chip and bulge explosion faults occur, the reason that the chip and the electrolytic capacitor bulge on the switching power supply chip IC1 is caused is inferred, the highest limit voltage which can be borne by the elements is generated, the load end is a fixed load which orderly operated according to a single chip microcomputer program, the high peak voltage cannot be generated, the peak voltage which enters the input end is from the mains supply, and therefore, the lightning stroke is inferred to be the extreme condition that the high, High energy is applied across the electrolytic capacitor C3.
According to the preliminary conjecture, the same circuit is additionally built according to the electrolytic capacitor C3, the switch transformer T1 and the switch power supply chip IC1 before improvement, 2KV lightning stroke test is carried out on the circuit, and the fault that the electrolytic capacitor C3 bulges and the switch power supply chip IC1 explodes is found to happen, so the test and analysis conclusion is verified. Fig. 2 shows a waveform of a reflected pulse voltage of the switching transformer T1 under test, which has an amplitude of 578V.
According to the analysis result, in the embodiment, the withstand voltage of the C3 is raised from 350V to 450V, when the lightning voltage enters from the L-N end, the rising slope of the rapidly rising lightning voltage is slowed and reduced after passing through the L1 and the C2, and the impact voltage actually applied to the two ends of the C3 is effectively reduced after passing through the rectifier bridge BR1, and the customized 450V withstand voltage electrolytic capacitor has excellent over-voltage and over-temperature resistance, so that the electrolytic capacitor can be ensured not to be overheated and bulge or even damaged when the electrolytic capacitor is subjected to lightning stroke or peripheral peak voltage.
In order to protect the switching power chip IC1, in a preferred embodiment, the turn ratio of the switching transformer T1 is further adjusted to be reduced from 10:1 to 8:1, the reflected pulse voltage of the first winding is reduced from 578V to 488V, and even if there is a certain leakage inductance in the production of the switching transformer T1, the amplitude of the maximum transient reflected pulse voltage between the 1 pin and the 4 pin of the first winding on the primary side of the switching transformer T1 is lower than the 700V withstand voltage of MOS transistors in the 4 pin and the 5 pin of the switching power chip IC1, so that the safety of the switching power chip IC1 is ensured, and overvoltage breakdown and even explosion damage of the chip are avoided.
In order to verify the effect, the lightning stroke test is carried out again after the improved parameters are adjusted, the electrolytic capacitor C3 and the switching power supply chip IC1 are not damaged, and the effectiveness of the improvement measures is further verified. Fig. 3 shows a waveform of the reflected pulse voltage of the switching transformer T1 under test, which has an amplitude of 488V.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. An ice maker on-board power supply, comprising:
a fuse (F1), one end of which is used for connecting the L line of the 220V power supply;
a thermistor (RT1), one end of which is used for connecting the N line of the 220V power supply;
a filter circuit connected to both the other end of the fuse (F1) and the other end of the thermistor (RT 1);
the rectifier bridge is connected with the output end of the filter circuit;
an electrolytic capacitor (C3), the anode of which is connected with the positive output end of the rectifier bridge, and the cathode of which is connected with the reverse output end of the rectifier bridge, wherein the withstand voltage of the electrolytic capacitor (C3) is not lower than 450V; and
and the power supply conversion circuit is connected with the electrolytic capacitor (C3).
2. The ice-making machine on-board power supply of claim 1, wherein said power conversion circuit comprises:
a first resistor (R1) having one end connected to the positive electrode of the electrolytic capacitor (C3);
a first capacitor (C5) having one end connected to the other end of the first resistor (R1);
a first diode (D1) having an anode connected to the anode of the electrolytic capacitor (C3);
a second resistor (R4) having one end connected to the cathode of the first diode (D1), and the other end of the second resistor (R4) connected to the other end of the first capacitor (C5);
a second diode (D3) having a cathode connected to the other end of the first capacitor (C5);
a third resistor (R3) having one end connected to the positive electrode of the electrolytic capacitor (C3);
a fourth resistor (R5) having one end connected to the other end of the third resistor (R3);
a switching transformer (T1) having a primary side including a first winding and a second winding, wherein one end of the first winding is connected to the anode of the electrolytic capacitor (C3), the other end of the first winding is connected to the anode of the second diode (D3), one end of the second winding is grounded, and a secondary side of the switching transformer (T1) includes a third winding, one end of the third winding is grounded;
a switching power supply chip (IC1), wherein a first S end, a second S end, a third S end and a fourth S end of the switching power supply chip (IC1) are connected with the cathode of the electrolytic capacitor (C3), a D end of the switching power supply chip (IC1) is connected with the anode of the second diode (D3), and an EN/UV end of the switching power supply chip (IC1) is connected with the other end of the fourth resistor (R5);
a fifth resistor (R9) having one end connected to the BP/M end of the switching power supply chip (IC 1);
a sixth resistor (R8) having one end connected to the other end of the fifth resistor (R9);
a second capacitor (C6) having one end connected to one end of the second winding and grounded, the other end of the second capacitor (C6) being connected to the other end of the sixth resistor (R8);
a third diode (D4) having a cathode connected to the other end of the sixth resistor (R8);
a seventh resistor (R7) having one end connected to the anode of the third diode (D4), and the other end of the seventh resistor (R7) connected to the other end of the second winding;
a first zener diode (ZD1) having an anode connected to one end of the fifth resistor (R9), and a cathode connected to the other end of the fifth resistor (R9) (ZD 1);
a third capacitor (C12), one end of which is connected to the anode of the first zener diode (ZD1), and the other end of the third capacitor (C12) is grounded;
an optical coupler (IC2), wherein an emitter of a phototriode of the optical coupler (IC2) is connected with a first S end, a second S end, a third S end and a fourth S end of the switching power supply chip (IC1) in parallel and grounded, a collector of the phototriode is connected with an EN/UV end of the switching power supply chip (IC1), and a cathode of a light emitting diode of the optical coupler (IC2) is grounded;
an eighth resistor (R11), one end of which is grounded, and the other end of the eighth resistor (R11) is connected with the anode of the optical coupler (IC 2);
a ninth resistor (R10) having one end connected to the other end of the eighth resistor (R11);
a second zener diode (ZD2) having an anode connected to the other end of the ninth resistor (R10);
a fourth diode (D2) having an anode connected to the other end of the third winding and a cathode connected to the cathode of the second zener diode (ZD2) (D2);
a fourth capacitor (C7), the anode of which is connected with the cathode of the fourth diode (D2), and the cathode of the fourth capacitor (C7) is grounded;
a fifth capacitor (C1) having one end connected to one end of the first winding;
a sixth capacitor (C30), one end of which is connected to the other end of the fifth capacitor (C1), the other end of the sixth capacitor (C30) being grounded;
a seventh capacitor (C9), one end of which is connected to the positive electrode of the fourth capacitor (C7), and the other end of the seventh capacitor (C9) is grounded;
a voltage amplifier (U1), the input end of which is connected with one end of the seventh capacitor (C9), and the ground end of the voltage amplifier (U1) is grounded;
an eighth capacitor (C10), the anode of which is connected with the output end of the voltage amplifier (U1), and the other end of the eighth capacitor (C10) is grounded;
and a ninth capacitor (C8) having one end connected to the positive electrode of the eighth capacitor (C10), and the other end of the ninth capacitor (C8) connected to ground.
3. The ice-making machine on-board power supply of claim 2, wherein the turn ratio of said switching transformer (T1) is adjusted such that the amplitude of the maximum transient reflected pulse voltage of said first winding is lower than the withstand voltage of the MOS transistor between the first S terminal of said switching power chip (IC1) and the D terminal of said switching power chip (IC 1).
4. An ice maker on-board power supply as claimed in claim 2, wherein said switching transformer (T1) has a turns ratio of 8:1, the amplitude of the maximum transient reflected pulse voltage of the first winding is 488V, and the withstand voltage value of a MOS transistor between the first S terminal of the switching power supply chip (IC1) and the D terminal of the switching power supply chip (IC1) is 700V.
5. The ice-making machine on-board power supply of claim 2, wherein a voltage of 5V is output between said ninth capacitor (C8) and said eighth capacitor (C10).
6. The ice-making machine on-board power supply of claim 2, wherein said fourth capacitor (C7) and said fourth diode (D2) are capable of outputting 12V voltage therebetween.
7. The ice-making machine on-board power supply of claim 2, wherein said third resistor (R3) and said first diode (D1) are capable of outputting a voltage of 310V.
8. The ice-making machine on-board power supply of claim 1, wherein said filter circuit comprises a tenth resistor (R2), a tenth capacitor (C4), an inductor (L1), and an eleventh capacitor (C2) connected in parallel with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125137.1A CN112467984A (en) | 2020-10-20 | 2020-10-20 | Power supply carried by ice machine board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125137.1A CN112467984A (en) | 2020-10-20 | 2020-10-20 | Power supply carried by ice machine board |
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| CN112467984A true CN112467984A (en) | 2021-03-09 |
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| CN202011125137.1A Pending CN112467984A (en) | 2020-10-20 | 2020-10-20 | Power supply carried by ice machine board |
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