CN112968514B - Power supply circuit and frequency conversion equipment - Google Patents
Power supply circuit and frequency conversion equipment Download PDFInfo
- Publication number
- CN112968514B CN112968514B CN202010843425.4A CN202010843425A CN112968514B CN 112968514 B CN112968514 B CN 112968514B CN 202010843425 A CN202010843425 A CN 202010843425A CN 112968514 B CN112968514 B CN 112968514B
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- power supply
- supply circuit
- frequency conversion
- frequency
- voltage stabilizing
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 65
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 43
- 238000002955 isolation Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 5
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 4
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 4
- 238000005406 washing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Inverter Devices (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a power supply circuit and a frequency conversion device, wherein the circuit comprises: a load power supply circuit for generating a first power supply voltage required by the operation of a load part of the frequency conversion device; the variable frequency power supply circuit is used for generating a second power supply voltage required by the working of a variable frequency driving part of the variable frequency equipment based on mains supply; the input end of the LDO voltage stabilizing chip is connected with the output of the load power supply circuit and the variable frequency power supply circuit, and the output end of the LDO voltage stabilizing chip is connected with the power supply end of the control chip of the variable frequency equipment; the door lock of the mains supply series frequency conversion equipment is connected with the power input of the frequency conversion power supply circuit; the mode of the mains supply series frequency conversion equipment door lock is adopted, and the output of the load power supply circuit and the output of the frequency conversion power supply circuit are respectively adopted as the input of the LDO voltage stabilizing chip in the door lock non-closed state and the door lock closed state, so that the load power supply circuit and the frequency conversion power supply circuit share one LDO voltage stabilizing chip, the safety performance is ensured, the circuit structure is simplified, and the design cost of the power supply circuit is reduced.
Description
Technical Field
The invention belongs to the technical field of equipment power supply, and particularly relates to a power supply circuit and frequency conversion equipment.
Background
The whole machine power supply of the washing machine generally comprises three parts: a display panel power supply part, a load power supply part and a variable frequency power supply part; in general, the load power supply part and the variable frequency power supply part are integrated into one power supply board as a complete machine and a core power supply part.
Because the MCU of the variable frequency control part is required to be ensured to be uninterrupted under the condition of sudden power failure, the integrated power supply board is actually an integrated board, the variable frequency power supply part is independently composed of a circuit structure of a rectifier bridge, a switching power supply and an LDO voltage stabilizing chip, and the load power supply part is also composed of a circuit structure of an independent rectifier bridge, a switching power supply and an LDO voltage stabilizing chip, namely, the whole circuit structure is not changed relative to an independent variable frequency power supply part and an independent load power supply part.
Disclosure of Invention
The invention aims to provide a power supply circuit and frequency conversion equipment, which adopt a mode of connecting a mains supply to a serial frequency conversion equipment door lock, respectively adopt the output of a load power supply circuit and the output of the frequency conversion power supply circuit as the input of an LDO voltage stabilizing chip in an unclosed state of the door lock and in a closed state of the door lock, so that the load power supply circuit and the frequency conversion power supply circuit share one LDO voltage stabilizing chip, further adopt a first isolation diode to isolate the load power supply circuit from the frequency conversion power supply circuit, ensure the safety performance, simplify the circuit structure and reduce the design cost of the power supply circuit.
The invention is realized by adopting the following technical scheme:
a power supply circuit is proposed for use in a frequency conversion device, comprising: a load power supply circuit for generating a first power supply voltage required by the operation of a load part of the frequency conversion equipment; the variable frequency power supply circuit is used for generating a second power supply voltage required by the working of a variable frequency driving part of the variable frequency equipment based on mains supply; further comprises: the input end of the LDO voltage stabilizing chip is connected with the output of the load power supply circuit and the variable frequency power supply circuit, and the output end of the LDO voltage stabilizing chip is connected with the power supply end of the control chip of the variable frequency equipment; the mains supply is connected in series with the door lock of the frequency conversion equipment and then is connected with the power supply input of the frequency conversion power supply circuit; when the door lock is not closed, the LDO voltage stabilizing chip takes the first power supply voltage as input to generate the power supply voltage of the control chip of the frequency conversion equipment, and the frequency conversion power supply circuit does not output the power supply voltage; when the door is locked, the variable frequency power supply circuit generates a second power supply voltage, and the LDO voltage stabilizing chip takes the second power supply voltage as input to generate the power supply voltage of the control chip of the variable frequency device.
Further, the power supply circuit further includes: the positive electrode of the first isolation diode is connected with the output of the variable frequency power supply circuit, and the negative electrode of the first isolation diode is connected with the input end of the LDO voltage stabilizing chip; and when the door lock of the frequency conversion equipment is not closed, the first isolation diode isolates the output of the load power supply circuit from the frequency conversion power supply circuit.
Further, the power supply circuit further includes: and the display power supply circuit is used for generating a third power supply voltage required by the operation of the display part of the frequency conversion equipment.
Further, the power supply circuit further includes: and the anode of the second isolation diode is connected with the output of the load power supply circuit, and the cathode of the second isolation diode is connected with the input end of the LDO voltage stabilizing chip.
Further, the control chip of the frequency conversion equipment comprises a frequency conversion main control chip of the frequency conversion equipment.
A frequency conversion device is proposed comprising a power supply circuit as described above.
Compared with the prior art, the invention has the advantages and positive effects that: according to the power supply circuit and the variable frequency device, the power supply of the commercial power supply is connected with the power supply input of the variable frequency power supply circuit after the door lock of the variable frequency device is connected in series, so that the variable frequency power supply circuit can be connected with the commercial power supply to generate the second power supply voltage required by the working of the variable frequency driving part only after the door lock is closed, when the door lock is not closed, the output of the load power supply circuit is used as the input of the LDO voltage stabilizing chip, and the LDO voltage stabilizing chip generates the power supply voltage required by the control chip of the variable frequency device, so that the variable frequency device can normally work except the variable frequency driving part, and at the moment, the motor can not operate because the variable frequency driving part is not electrified, and the safety problem can not be generated; after the door lock is closed, the variable frequency power supply circuit starts to generate a second power supply voltage required by the work of the variable frequency driving part, meanwhile, the second power supply voltage is used as the input of the LDO voltage stabilizing chip to generate the power supply voltage required by the control chip of the variable frequency equipment, the whole variable frequency equipment normally operates, and the first power supply voltage generated by the load power supply circuit does not participate in the power supply of the LDO voltage stabilizing chip and only supplies power for the load part; when the power is suddenly lost, the power supply of the load part is lost, and the motor continues to run due to inertia, so that the power is generated to supply power to the variable frequency power supply circuit, the variable frequency driving part still has power, the LDO voltage stabilizing chip can work normally, the control chip of the variable frequency equipment and the variable frequency driving part can be guaranteed to run reliably, the motor cannot run out of control, the whole safety performance is protected, and meanwhile, the safety performance is guaranteed, meanwhile, the circuit structure is simplified, and the design cost of the power supply circuit is reduced because the load power supply circuit and the variable frequency power supply circuit share one LDO voltage stabilizing chip.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a power supply circuit according to the present invention;
FIG. 2 is a schematic diagram of a power supply circuit according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a third embodiment of a power supply circuit according to the present invention;
FIG. 4 is a circuit diagram of a load supply circuit and a display supply circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a frequency conversion power supply circuit according to an embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The invention provides a power supply circuit, which is used in frequency conversion equipment, and aims to simplify the structure of the power supply circuit and reduce the design cost of the power supply circuit while ensuring the safety of the frequency conversion equipment, and specifically comprises the following components as shown in fig. 1: the LDO voltage stabilizing circuit comprises a load power supply circuit 1, a variable frequency power supply circuit 2 and an LDO voltage stabilizing chip 3.
The load power supply circuit 1 is used for generating a first power supply voltage VCC1 required by the operation of a load part 4 of the frequency conversion equipment; the variable frequency power supply circuit 2 is configured to generate a second power supply voltage VCC2 required for operation of a variable frequency driving portion 5 (including but not limited to an IPM driving chip, a motor, etc.) of the variable frequency device based on mains power supply.
Referring to fig. 5, the input end of the LDO voltage stabilizing chip 3 is connected with the output of the load power supply circuit 1 and the output of the frequency conversion power supply circuit 2, and the output end thereof is connected with the power supply end of the control chip 6 of the frequency conversion device.
The door lock K of the L-line series frequency conversion equipment powered by the mains supply is connected with the power supply input of the frequency conversion power supply circuit 2; the variable frequency power supply circuit 2 can be connected with the mains supply to generate the second power supply voltage VCC2 required by the operation of the variable frequency driving part 5 only after the door lock K is closed, when the door lock K is not closed, the output of the load power supply circuit 1 is adopted to supply power to the load circuit 4 on one hand, on the other hand, the output of the load power supply circuit 1 is used as the input of the LDO voltage stabilizing chip 3, the LDO voltage stabilizing chip 3 generates the power supply voltage required by the control chip 6 of the variable frequency device, the variable frequency device except the variable frequency driving part 5 can normally operate, and at the moment, the motor can not operate because the variable frequency driving part 6 is not electrified, and no safety problem can be generated.
After the door lock K is closed, the variable frequency power supply circuit 2 starts to generate a second power supply voltage VCC2 required by the operation of the variable frequency driving part 5, meanwhile, the second power supply voltage VCC2 is used as the input of the LDO voltage stabilizing chip to generate the power supply voltage required by the control chip 6 of the variable frequency equipment, the whole variable frequency equipment normally operates, and the first power supply voltage VCC1 generated by the load power supply circuit 1 does not participate in the power supply of the LDO voltage stabilizing chip 3 and only supplies power for the load part 4.
When the power is suddenly lost, the power supply of the load part 4 is lost, and the motor continues to run due to inertia, so that the power is generated to supply power to the variable frequency power supply circuit 2, the variable frequency driving part 5 still has power, the LDO voltage stabilizing chip 3 can work normally, the control chip 6 of the variable frequency equipment and the variable frequency driving part 5 can run reliably, the motor cannot be out of control, and the overall safety performance is protected.
In the above, the load power supply circuit 1 and the variable frequency power supply circuit 2 share one LDO voltage stabilizing chip 3, so that the safety performance is ensured, the circuit structure is simplified, and the design cost of the power supply circuit is reduced.
In some embodiments of the present invention, when the variable frequency device is a variable frequency washing machine, VCC1 is typically not isolated 12V and VCC2 is typically not isolated 15V.
As shown in fig. 2, in some embodiments of the present invention, the power supply circuit further includes a first isolation diode D1, whose anode is connected to the output of the variable frequency power supply circuit 2 and whose cathode is connected to the input terminal of the LDO voltage stabilizing chip 3; when the door lock K of the frequency conversion equipment is not closed, the first isolation diode D1 isolates the first power supply voltage VCC1 from the frequency conversion power supply circuit 2, so that the safety performance of the power supply circuit is ensured.
As shown in fig. 3, in some embodiments of the present invention, the power supply circuit further includes a second isolation diode D2, whose anode is connected to the output of the load power supply circuit 1, and whose cathode is connected to the input terminal of the LDO voltage regulator chip 3, so as to further isolate the frequency conversion power supply circuit 2 from the load power supply circuit 1.
As shown in fig. 4, in some embodiments of the present invention, the power supply circuit further includes a display power supply circuit 7 for generating a third power supply voltage VCC3 required for the operation of the display portion of the inverter device.
In some embodiments of the present invention, the control chip 6 of the frequency conversion device includes, but is not limited to, a main control chip of the frequency conversion device, a frequency conversion main control chip of the frequency conversion device, or other control chips.
Based on the power supply circuit, the invention provides the frequency conversion equipment, the door lock of the frequency conversion equipment is connected in series between the mains supply and the power supply input of the frequency conversion power supply circuit, so that the frequency conversion power supply circuit can be connected with the mains supply to generate the voltage required by the work of the frequency conversion driving part only after the door lock is closed, the frequency conversion driving part does not work when the door lock is not closed, the motor does not operate, the output of the load power supply circuit is used as the input of the LDO voltage stabilizing chip, and the LDO voltage stabilizing chip generates the power supply voltage required by the control chip of the frequency conversion equipment, so that the frequency conversion equipment can work normally except the frequency conversion driving part; after the door lock is closed, the variable frequency power supply circuit starts to generate a second power supply voltage required by the working of the variable frequency driving part, and meanwhile, the second power supply voltage is used as the input of the LDO voltage stabilizing chip to generate the power supply voltage required by the control chip of the variable frequency equipment, and the variable frequency equipment is normally operated as a whole; when the power is suddenly lost, the power supply of the load part is lost, and the motor continues to run due to inertia, so that the power is generated to supply power to the variable-frequency power supply circuit, the variable-frequency driving part is still powered, the LDO voltage stabilizing chip can work normally, the control chip of the variable-frequency equipment and the variable-frequency driving part can be guaranteed to run reliably, the motor cannot run out of control, the overall safety performance is protected, and meanwhile, the circuit structure is simplified and the circuit design cost is reduced due to the fact that only one LDO voltage stabilizing chip is adopted.
In the invention, the first power supply voltage can be converted into the power supply required by the specific load through other switching power supply circuits, and the second power supply voltage can be converted into the power supply required by the variable frequency driving circuit through other switching power supply circuits. When power is lost, the motor is operated continuously by inertia, so that the circuit for supplying power to the full-bridge rectifying circuit can be realized according to the prior art.
It should be noted that the above description is not intended to limit the invention, but rather the invention is not limited to the above examples, and that variations, modifications, additions or substitutions within the spirit and scope of the invention will be within the scope of the invention.
Claims (6)
1. A power supply circuit for use in a frequency conversion device, comprising:
a load power supply circuit for generating a first power supply voltage required by the operation of a load part of the frequency conversion equipment;
the variable frequency power supply circuit is used for generating a second power supply voltage required by the working of a variable frequency driving part of the variable frequency equipment based on mains supply;
characterized by further comprising:
the input end of the LDO voltage stabilizing chip is connected with the output of the load power supply circuit and the variable frequency power supply circuit, and the output end of the LDO voltage stabilizing chip is connected with the power supply end of the control chip of the variable frequency equipment;
the mains supply is connected in series with the door lock of the frequency conversion equipment and then is connected with the power supply input of the frequency conversion power supply circuit; when the door lock is not closed, the LDO voltage stabilizing chip takes the first power supply voltage as input to generate the power supply voltage of the control chip of the frequency conversion equipment, and the frequency conversion power supply circuit does not output the power supply voltage; when the door is locked, the variable-frequency power supply circuit generates a second power supply voltage, the LDO voltage stabilizing chip takes the second power supply voltage as input to generate the power supply voltage of the control chip of the variable-frequency equipment, and the first power supply voltage does not participate in the power supply of the LDO voltage stabilizing chip;
when the power is suddenly lost, the motor continues to run due to inertia, so that power is generated to supply power to the variable-frequency power supply circuit, the variable-frequency driving part still has power, the LDO voltage stabilizing chip can work normally, and the motor cannot be out of control.
2. The power supply circuit of claim 1, wherein the power supply circuit further comprises:
the positive electrode of the first isolation diode is connected with the output of the variable frequency power supply circuit, and the negative electrode of the first isolation diode is connected with the input end of the LDO voltage stabilizing chip;
and when the door lock of the frequency conversion equipment is not closed, the first isolation diode isolates the output of the load power supply circuit from the frequency conversion power supply circuit.
3. The power supply circuit of claim 2, wherein the power supply circuit further comprises:
and the display power supply circuit is used for generating a third power supply voltage required by the operation of the display part of the frequency conversion equipment.
4. The power supply circuit of claim 1, wherein the power supply circuit further comprises:
and the anode of the second isolation diode is connected with the output of the load power supply circuit, and the cathode of the second isolation diode is connected with the input end of the LDO voltage stabilizing chip.
5. The power supply circuit of claim 1, wherein the control chip of the frequency conversion device comprises a frequency conversion master control chip of the frequency conversion device.
6. A frequency conversion device comprising a power supply circuit as claimed in any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843425.4A CN112968514B (en) | 2020-08-20 | 2020-08-20 | Power supply circuit and frequency conversion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843425.4A CN112968514B (en) | 2020-08-20 | 2020-08-20 | Power supply circuit and frequency conversion equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112968514A CN112968514A (en) | 2021-06-15 |
| CN112968514B true CN112968514B (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010843425.4A Active CN112968514B (en) | 2020-08-20 | 2020-08-20 | Power supply circuit and frequency conversion equipment |
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| CN (1) | CN112968514B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115733235A (en) * | 2021-08-30 | 2023-03-03 | 青岛海尔洗衣机有限公司 | Power supply circuit |
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| CN112968514A (en) | 2021-06-15 |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 230000, No. 127 Zishi Road, Economic and Technological Development Zone, Hefei City, Anhui Province, Warehouse No. 1, Block 101 Patentee after: Hefei Lingzhi IoT Technology Co.,Ltd. Patentee after: Karos IoT Technology Co.,Ltd. Address before: 230000, No. 127 Zishi Road, Economic and Technological Development Zone, Hefei City, Anhui Province, Warehouse No. 1, Block 101 Patentee before: Hefei Haier Intelligent Electronics Co.,Ltd. Patentee before: Haier CAOS IOT Ecological Technology Co.,Ltd. |