CN115733235A - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN115733235A CN115733235A CN202111004144.0A CN202111004144A CN115733235A CN 115733235 A CN115733235 A CN 115733235A CN 202111004144 A CN202111004144 A CN 202111004144A CN 115733235 A CN115733235 A CN 115733235A
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- power supply
- circuit
- branch
- supply branch
- switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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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
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
Abstract
The application provides a power supply circuit, which comprises a first power supply branch and a second power supply branch with overvoltage protection; the input end of the first power supply branch is connected with the first end of the first branch switch, the output end of the first power supply branch is connected with a power module for driving a motor of the washing machine, and the second end of the first branch switch is connected with alternating current commercial power; the input end of the second power supply branch is connected with alternating current commercial power, and the output end of the second power supply branch is connected with a processing chip of the washing machine; the output end of the first power supply branch is connected with the output end of the second power supply branch; the switch is closed, the first power supply branch outputs a first power supply voltage based on alternating current commercial power, and the second power supply branch enters overvoltage protection; the switch is disconnected, and the second power supply branch outputs a second power supply voltage based on the alternating current commercial power. The second power supply branch circuit is conducted without depending on the state of a door lock switch, when the system is detected to be in an OTA state, the OTA can be directly accessed through remote software control or built-in working logic, convenience in operation is realized, and safety is guaranteed.
Description
Technical Field
The application belongs to the technical field of electronics, especially relates to a power supply circuit.
Background
The normal operation of the washing machine needs a complete set of power supply system support, wherein the power supply circuit board is a core component of the power supply system. In normal operation of the washing machine, the power supply circuit board provides control voltage to a power module for driving the motor and a processing chip of the washing machine, and the power module is usually integrated in a motor driving board to ensure that the motor can be normally driven.
At present, the processing chip of the washing machine is also implanted with functions such as OTA (remote upgrade program) in practical application. During the OTA process of the processing chip, the motor may malfunction, for example, when the OTA is upgraded and fails, some malfunction may be triggered, resulting in a safety problem.
Disclosure of Invention
The application provides a power supply circuit for solve OTA in-process motor misrun's problem.
The application provides a power supply circuit, includes: the overvoltage protection circuit comprises a first power supply branch and a second power supply branch with overvoltage protection; the input end of the first power supply branch is connected with the first end of a first branch switch, the output end of the first power supply branch is connected with a power module for driving a motor of the washing machine, and the second end of the first branch switch is connected with an alternating current commercial power; the input end of the second power supply branch is connected with the alternating current mains supply, and the output end of the second power supply branch is connected with a processing chip of the washing machine; the output end of the first power supply branch is connected with the output end of the second power supply branch; when the first branch switch is closed, the first power supply branch outputs a first power supply voltage based on alternating current mains supply, and the first power supply voltage is higher than the overvoltage protection voltage of the second power supply branch; when the first branch switch is switched off, the second power supply branch outputs a second power supply voltage based on the alternating current commercial power.
Optionally, an isolating element is disposed between the first power supply branch and the second power supply branch; the isolation element includes: a first diode; the anode of the first diode is connected with the output end of the first power supply branch, and the cathode of the first diode is connected with the output end of the second power supply branch.
Optionally, the second power supply branch includes: the first filter circuit, the first rectifying circuit and the first power supply; the first filter circuit is used for filtering and outputting the alternating current commercial power, and the first rectifying circuit is used for rectifying and outputting the received signal; the input end of the first power supply is connected with the first rectifying circuit, and the output end of the first power supply is used as the output end of the second power supply branch.
Optionally, the first rectification circuit includes: a second diode and a first polarity capacitor; the positive pole of the second diode is connected with the output end of the first filter protection circuit, the negative pole of the second diode is connected with the positive pole of the first polarity capacitor and the input end of the first power supply, and the negative pole of the first polarity capacitor is grounded.
Optionally, the power supply circuit further includes: the output voltage regulating circuit is positioned between the second power supply branch and the processing chip; the input end of the output voltage regulating circuit is connected with the output end of the second power supply branch circuit, and the output end of the output voltage regulating circuit is connected with the processing chip.
Optionally, the output voltage regulating circuit includes: linear regulators or DC/DC conversion circuits.
Optionally, the first power supply branch includes: the second filter protection circuit, the second rectifying circuit and the second power supply; the second filter protection circuit is connected between the first end of the first branch switch and the input end of the second rectifying circuit, the output end of the second rectifying circuit is connected with the input end of the second power supply, and the second rectifying circuit is used for rectifying and outputting received signals; and the output end of the second power supply is used as the output end of the first power supply branch.
Optionally, the second filter protection circuit includes: a second filter circuit and a protection circuit; the second filter circuit is used for filtering and outputting the alternating current commercial power, and the protection circuit is used for protecting the first power supply branch.
Optionally, the first branch switch includes a door lock switch; or a relay switch and a door lock switch which are connected in series; or, a relay switch.
Optionally, the power supply circuit further includes: a second branch switch; one end of the first branch switch is connected with a live wire of the alternating current commercial power, and the other end of the first branch switch is connected with the first power supply branch; one end of the second branch switch is connected with a zero line of the alternating current commercial power, and the other end of the second branch switch is connected with the first power supply branch.
The embodiment of the application provides a power supply circuit, which comprises a first power supply branch circuit and a second power supply branch circuit, wherein the first power supply branch circuit is connected between a branch switch and a power module for driving a motor, the second power supply branch circuit is connected between an alternating current commercial power supply and a processing chip, and the branch switch is connected to the alternating current commercial power supply; and the output of the first power supply branch is connected to the output of the second power supply branch. When the first power supply branch circuit supplies power normally, the second power supply branch circuit is triggered to be in overvoltage protection, and when the first power supply branch circuit does not output, namely, the motor is ensured not to run, the second power supply branch circuit can output power normally. Through this scheme, when washing machine normally worked, first power supply branch road output first supply voltage to make motor and processing chip normally work under first supply voltage effect, when processing the chip and being in OTA, guarantee that first supply voltage is not exported to first power supply branch road, thereby ensure that the motor can not take place the maloperation, thereby ensure safety.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. Embodiments of the present application are described below with reference to the accompanying drawings in conjunction with circuit structures.
FIG. 1 is a schematic diagram of an application scenario of a washing machine with OTA functionality;
fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;
fig. 3 and fig. 4 are schematic structural diagrams of a power supply circuit provided in a second embodiment of the present application;
fig. 5 is a schematic structural diagram of a power supply circuit according to a third embodiment of the present application;
fig. 6 is a schematic diagram of a power supply circuit according to a third embodiment of the present application;
fig. 7 and fig. 8 are schematic structural diagrams of another power supply circuit provided in the third embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The main terms to which this application relates are explained first:
a power supply circuit: the circuit is a circuit which performs electric signal conversion by means of digital electronic technology, analog electronic technology, power electronic technology and the like according to actual requirements and supplies power to some equipment or components to be powered;
a filter circuit: the device is a circuit module used for filtering out unwanted waveform components in the mains supply;
a protection circuit: the circuit module is used for protecting components in a circuit board so as to prevent damage caused by voltage fluctuation and the like;
a rectifier circuit: the circuit module is used for converting alternating current input into direct current output;
isolation element: the electronic component is used for isolating different circuit modules to prevent signals from interfering with each other in the processes of sampling and the like;
washing machine OTA function: the built-in remote upgrading program of the washing machine is generally required to be automatically carried out in an idle state of the washing machine;
furthermore, it should be noted that, in the description of the present application, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
The normal operation of the washing machine needs a complete set of power supply system support, wherein the power supply circuit board is a core component of the power supply system. In the normal operation of the washing machine, the power supply circuit board is directly connected with the motor to ensure that the motor has stable power input. In the above power supply system, only one power supply is usually arranged, that is, the circuit board provides only one output to the motor side after the mains supply is connected. At present, the washing machine is also implanted with functions such as OTA (remote upgrade program) and the like in practical application.
Fig. 1 shows an application scenario of a washing machine with OTA function, where the left half is the washing machine and the right half is the mobile phone and software for controlling the implementation of OTA function. Wherein, 11 are washing machine's cylinder, 12 are washing machine equipment's motor drive board, 13 are the motor that drives the cylinder and carry out work, 14 are the lock switch, 15 are the long-range APP interface that control washing machine realized the OTA function.
The washing machine comprises a motor driving board, a motor driving board and a door lock switch, wherein the motor driving board is integrated with a power module for driving a motor of the washing machine, in one example, the door lock switch is connected in series on a power supply path for supplying power to the power module, so when the washing machine works normally, the door lock switch needs to be closed firstly, in popular terms, a drum door of the washing machine is closed, a power supply circuit of the power module is conducted at the moment, after corresponding function setting is completed, the motor 13 can drive an 11 drum to rotate, and the washing machine starts to work.
In one power supply scheme, the output end of the power supply circuit of the power module is further connected to the processing chip, that is, the power module and the processing chip are supplied with power through the same power supply circuit. When the OTA upgrade needs to be executed, the motor is controlled to be not operated through software, and the OTA is controlled to be started. In the power supply scheme, when the OTA is upgraded, the risk of motor misoperation exists, and the use safety is influenced.
Based on this, the embodiment of the application provides a power supply circuit, to above-mentioned problem, solves the problem of OTA in-process motor misrun.
Example one
Fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application, and as shown in fig. 2, the power supply circuit includes: a first supply branch 31 and a second supply branch 32 with overvoltage protection; wherein the content of the first and second substances,
the input end of the first power supply branch 31 is connected with the first end of the first branch switch 33, the output end of the first power supply branch 31 is connected with the power module 34 for driving the motor of the washing machine, and the second end of the first power supply branch 33 is connected with the alternating current commercial power; the input end of the second power supply branch 32 is connected with the alternating current commercial power, and the output end of the second power supply branch 32 is connected with the processing chip 35 of the washing machine; the output ends of the first power supply branch 31 and the second power supply branch 32 are connected;
when the first branch switch 33 is closed, the first power supply branch 31 outputs a first power supply voltage based on the ac mains, and the first power supply voltage is higher than the overvoltage protection voltage of the second power supply branch 32; when the first branch switch 33 is turned off, the second power supply branch 32 outputs a second power supply voltage based on the ac commercial power; in one example, the bypass switch includes, but is not limited to: a door lock switch; or a relay switch and a door lock switch which are connected in series; or, a relay switch.
Taking the door lock switch as an example, the on-off state of the door lock switch reflects the on-off state of the washing machine door, specifically, when the washing machine door is closed, the door lock is turned on and closed, and when the washing machine door is opened, the door lock switch is turned off. The alternating current commercial power is the common civil power frequency alternating current, and the washing machine and other electric appliances need to be supplied with power through the input of the alternating current commercial power, the frequency of the electric appliances is 50Hz, and the rated voltage is 220V.
In this embodiment, the second power supply branch 32 has overvoltage protection. The overvoltage protection is used to perform an overvoltage protection action upon detecting that the voltage at the output of the second supply branch 32 is higher than a predetermined overvoltage protection voltage. The over-current protection action includes, but is not limited to, measures such as opening a loop and the like for stopping the output voltage of the second power supply branch 32.
The following describes an example of the operation process of the power supply circuit in this embodiment with reference to an actual scenario: when the washing machine is in operation, the washing machine door is closed, correspondingly, the door lock switch is closed, the first power supply branch 31 is connected to the alternating current mains supply, and then outputs a first power supply voltage, and the first power supply voltage is used for providing a control voltage for the power module and a voltage for the processing chip, so that the motor can be normally driven, and the processing chip controls the washing machine to normally operate. At this time, the first power supply voltage output by the first power supply branch 31 is transmitted to the output end of the second power supply branch 32, so that the voltage at the output end of the second power supply branch 32 is higher than the predetermined overvoltage protection voltage, and the second power supply branch 32 is triggered to enter an overvoltage protection state, thereby realizing the normal operation of the washing machine. When the washing machine is in an idle state, the door of the washing machine is opened, correspondingly, the door lock switch is disconnected, the first power supply branch 31 is not connected to the alternating current mains supply, the first power supply branch 31 does not output the first power supply voltage, and the second power supply branch 32 leaves the overvoltage protection state. At this time, the second power supply branch 32 outputs the second power supply voltage to the processing chip, and at this time, the processing chip may be controlled to perform OTA upgrade. It can be understood that, based on the power supply circuit of this embodiment, when the OTA is upgraded, it is ensured that the first power supply branch does not output the first power supply voltage, thereby ensuring that the motor does not operate, and improving the safety of operation.
Specifically, the triggering condition of the overvoltage protection can be set as required. As can be seen from fig. 2, the output terminal of the first power supply branch 31 is connected to the output terminal of the second power supply branch 32, and as an example, the trigger condition of the overvoltage protection can be set to execute the overvoltage protection when the voltage at the output terminal of the second power supply branch is higher than the second power supply voltage which is normally output by the second power supply branch. Accordingly, in one example, the first and second supply voltages may be set to satisfy the following condition: namely, the first power supply voltage normally output by the first power supply branch is greater than the sum of the second power supply voltage and the loss normally output by the second power supply branch. The loss here refers to a voltage loss on a connection path between the output terminal of the first power supply branch to the output terminal of the second power supply branch.
Based on the solution of the present embodiment, the conduction of the second power supply branch 32 does not need to depend on the state of the door lock switch. When the system is detected to be capable of entering the OTA state, no additional operation is needed, the OTA process can be entered through remote software control or built-in working logic, and convenience in operation is realized.
The embodiment provides a power supply circuit, which comprises a first power supply branch and a second power supply branch with overvoltage protection; the input end of the first power supply branch is connected with the first end of the first branch switch, the output end of the first power supply branch is connected with a power module for driving a motor of the washing machine, and the second end of the first branch switch is connected with alternating current commercial power; the input end of the second power supply branch is connected with the alternating current commercial power, and the output end of the second power supply branch is connected with a processing chip of the washing machine; the output end of the first power supply branch is connected with the output end of the second power supply branch; when the first branch switch is closed, the first power supply branch outputs a first power supply voltage based on alternating current commercial power, and the first power supply voltage is higher than the overvoltage protection voltage of the second power supply branch; when the first branch switch is turned off, the second power supply branch outputs a second power supply voltage based on the alternating current commercial power. Because the second power supply branch circuit is conducted without depending on the state of a door lock switch, when the system is detected to be in the OTA state, the first branch circuit switch is not required to be additionally operated by a user, the OTA process can be accessed through remote software control or built-in working logic, the convenience in operation is realized, and the safety in the OTA process is ensured.
Example two
In the second embodiment, a connection manner between the output terminals of the first power supply branch and the second power supply branch is described as an example based on the first embodiment. In one example, an isolation element is provided between the first and second power supply branches. In one example, the isolation element is a first diode 41, wherein an anode of the first diode 41 is connected to the output terminal of the first power supply branch 31, and a cathode of the first diode 41 is connected to the output terminal of the second power supply branch 32.
With reference to fig. 3 and 4, an example of the arrangement position of the isolation element is provided, and fig. 3 and 4 are schematic structural diagrams of a power supply circuit provided in the second embodiment of the present application. In one example, the first diode may be connected in series between the first power supply branch and the power module as shown in fig. 3, i.e., the anode is connected to the output terminal of the first power supply branch, and the cathode is connected to the output terminal of the second power supply branch and the power module. In another example, the first diode may be connected in a position as shown in fig. 4, with a positive terminal connected to the output terminal of the first power supply branch and the power module, and a negative terminal connected to the output terminal of the second power supply branch.
In this embodiment, the isolation element is disposed between the first power supply branch and the second power supply branch, so that signal interference generated by the other branch during sampling and detection can be effectively avoided. The power supply circuit provided by the embodiment has the advantages that by introducing the isolation element, under the condition of ensuring the working safety of the circuit, the switching noise possibly generated during the working of the circuit is effectively reduced, the interference of working signals such as sampling and the like by other power supply branches is further ensured, and the signal quality is optimized.
EXAMPLE III
Third embodiment a specific structure of the first power supply branch and the second power supply branch is described as an example based on any other embodiment.
In one example, a specific structure of the second power supply branch is exemplified. Fig. 5 is a schematic structural diagram of a power supply circuit provided in a third embodiment of the present application, and as shown in fig. 5, on the basis of any other implementation, the second power supply branch 32 includes:
a first filter circuit 61, a first rectifier circuit 62, and a first power supply 63;
the first filter circuit 61 is configured to filter and output the ac mains; the first rectifying circuit 62 is used for rectifying and outputting the received signal; an input end of the first power supply 63 is connected to the first rectifying circuit 62, and an output end of the first power supply 63 serves as an output end of the second power supply branch 32.
In one example, the output voltages of the first and second power supply branches are adjusted to match the power supply requirements of the processing chip. As an example, as shown in fig. 5, the power supply circuit further includes: an output voltage regulating circuit 67 located between the second power supply branch 32 and the processing chip 35;
the input end of the output voltage regulating circuit 67 is connected to the output end of the second power supply branch 32, and the output end of the output voltage regulating circuit 67 is connected to the processing chip 35.
The output voltage regulating circuit 67 is configured to perform voltage conversion on the received voltage and provide the converted voltage to the processing chip.
The type of the output voltage regulating circuit is not limited. As an example, the output voltage regulation circuit may include, but is not limited to, one of: linear regulators, DC/DC conversion circuits, and the like. Alternatively, the linear regulator may include, but is not limited to: low Dropout Regulator (LDO for short)
In another example, a specific structure of the first power supply branch is exemplified. As shown in fig. 5, in any other embodiment, the first power supply branch 31 includes: a second filter protection circuit 64, a second rectification circuit 65, and a second power supply 66; the second filter protection circuit 64 includes: a second filter circuit and a protection circuit; the second filter circuit is used for filtering and outputting alternating current commercial power, and the protection circuit is used for protecting the first power supply branch 31; the second filter protection circuit 64 is connected between the first end of the first branch switch and the input end of the second rectification circuit 65, the output end of the second rectification circuit 65 is connected with the input end of the second power supply 66, and the second rectification circuit 65 is used for rectifying and outputting the signal output by the second filter protection circuit 64; the output of the second power supply 66 serves as the output of the first power supply branch 31.
There are various implementation structures of the first rectifying circuit, and as shown in fig. 6, the first rectifying circuit 62 includes: a second diode 621 and a first polarity capacitor 622; the anode of the second diode 621 is connected to the output terminal of the first filter protection circuit 61, the cathode of the second diode 621 is connected to the anode of the first polarity capacitor 622 and the input terminal of the first power supply 63, and the cathode of the first polarity capacitor 622 is grounded.
As an example, for optimizing the control logic, the first branch switch 33 may be composed of a door lock switch and a first relay K1 connected in series, see fig. 6, and the control process may be more convenient and consistent with the user experience by providing the first relay.
Alternatively, there are various types of circuit configurations. As an example, the first power supply comprises a flyback switching power supply. The rectification modes of the flyback switching power supply include, but are not limited to: half-wave rectification, full-wave rectification, 2-time voltage rectification. As another example, the second rectification circuit includes a 2-voltage-doubler rectification circuit. As another example, the second power supply includes a BUCK switching power supply.
The operation of the power supply circuit is illustrated below with reference to fig. 6:
when the first relay K1 is closed and the door lock switch is switched on, the washing machine enters a normal working state. In the working scenario given in the first embodiment, in the motor driving board portion shown in fig. 6, the first power supply branch outputs the voltage normally. Inputting the alternating current commercial power into a second filtering protection circuit in the first power supply branch circuit to obtain a filtered alternating current signal; the alternating current signal is input into a 2-time voltage rectification circuit and is converted into a direct current signal through a rectification circuit; the direct current signal, namely the network label HVDC shown in FIG. 6, is used as the input of the BUCK switch power supply and the bus voltage of the power device; the first supply voltage and the HVDC are connected to a power device which modulates the HVDC to output a voltage which meets the requirements of the drive motor.
Meanwhile, the second power supply branch 32 does not output voltage at this time. This is because the flyback switching power supply of the second branch cannot normally output when entering an overvoltage protection state. The filter circuit and the rectifier circuit in the second power supply branch are similar to the corresponding modules of the first power supply branch in function.
When the door lock switch is switched off, the motor of the washing machine is not powered, and is in a safe state at the moment. In one example, the washing machine automatically enters the OTA state when the idle standby time meets a preset requirement. At this time, the first power supply branch is disconnected from the alternating current commercial power in the whole way, and the second power supply branch outputs voltage normally. Different from the normal operation of the washing machine, the flyback switching power supply does not enter an overvoltage protection state at this time, can normally output voltage, and can obtain voltage with small amplitude fluctuation through the linear voltage regulator or the DCDC conversion circuit shown in fig. 6.
Alternatively, the arrangement of the relay may also be according to the embodiments shown in fig. 7 or fig. 8.
As shown in fig. 7, in one example, the power supply circuit may further include: a second branch switch K; one end of the first branch switch 33 is connected with a live wire of the alternating current commercial power, and the other end of the first branch switch 33 is connected with the first power supply branch; one end of the second branch switch K is connected to the zero line of the ac mains supply, and the other end of the second branch switch K is connected to the first power supply branch 31. Illustratively, the power supply circuit may include only the second branch switch K, the control logic of which is similar to that when only the first branch switch 33 is provided. As shown in fig. 8, in another example, a third branch switch K3 may be disposed between the ac utility power and the second power supply circuit, one end of the third branch switch K3 is connected to the ac utility power, and the other end is connected to the input end of the second power supply circuit. The third branch switch K3 can be connected to the live wire or the zero wire. By this example, the second power supply branch may be controlled to be disconnected when no operation and OTA is needed to reduce power consumption.
Based on the example of the above embodiment, the two power supply branches may have three modules with similar functions, namely, a filter protection circuit, a rectifying circuit, and a power supply. The filter protection circuit is used for filtering and outputting alternating current commercial power; the rectifying circuit is used for rectifying and outputting the received signals; the input end of the power supply is connected with the rectifying circuit, and the output end of the power supply is used as the output end of the corresponding power supply branch. The design of the corresponding module can meet the expected requirement of electric signal conversion, and ensures that the motor cannot run by mistake when the processing chip carries out OTA.
So far, the technical solutions of the present application have been described with reference to the embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present application is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.
Claims (10)
1. A power supply circuit, characterized in that the power supply circuit comprises: the overvoltage protection circuit comprises a first power supply branch and a second power supply branch with overvoltage protection;
the input end of the first power supply branch is connected with the first end of a first branch switch, the output end of the first power supply branch is connected with a power module for driving a motor of the washing machine, and the second end of the first branch switch is connected with an alternating current commercial power; the input end of the second power supply branch is connected with the alternating current commercial power, and the output end of the second power supply branch is connected with a processing chip of the washing machine; (ii) a The output end of the first power supply branch is connected with the output end of the second power supply branch;
when the first branch switch is closed, the first power supply branch outputs a first power supply voltage based on alternating current commercial power, and the first power supply voltage is higher than the overvoltage protection voltage of the second power supply branch; when the first branch switch is turned off, the second power supply branch outputs a second power supply voltage based on the alternating current commercial power.
2. The power supply circuit according to claim 1, wherein an isolation element is disposed between the first power supply branch and the second power supply branch; the isolation element includes: a first diode;
the anode of the first diode is connected with the output end of the first power supply branch, and the cathode of the first diode is connected with the output end of the second power supply branch.
3. The power supply circuit of claim 1, wherein the second power supply branch comprises: the first filter circuit, the first rectifying circuit and the first power supply;
the first filter circuit is used for filtering and outputting the alternating current commercial power, and the first rectifier circuit is used for rectifying and outputting the received signal; the input end of the first power supply is connected with the first rectifying circuit, and the output end of the first power supply is used as the output end of the second power supply circuit.
4. The power supply circuit according to claim 3, wherein the first rectification circuit comprises: a second diode and a first polarity capacitor;
the positive pole of the second diode is connected with the output end of the first filter protection circuit, the negative pole of the second diode is connected with the positive pole of the first polarity capacitor and the input end of the first power supply, and the negative pole of the first polarity capacitor is grounded.
5. The power supply circuit of claim 2, further comprising: the output voltage regulating circuit is positioned between the second power supply branch and the processing chip;
the input end of the output voltage regulating circuit is connected with the output end of the second power supply branch circuit, and the output end of the output voltage regulating circuit is connected with the processing chip.
6. The power supply circuit of claim 5, wherein the output voltage regulation circuit comprises: linear regulators or DC/DC conversion circuits.
7. The power supply circuit of claim 1, wherein the first power supply branch comprises: the second filter protection circuit, the second rectifying circuit and the second power supply;
the second filter protection circuit is connected between the first end of the first branch switch and the input end of the second rectifying circuit, the output end of the second rectifying circuit is connected with the input end of the second power supply, and the second rectifying circuit is used for rectifying and outputting received signals; and the output end of the second power supply is used as the output end of the first power supply branch.
8. The power supply circuit of claim 7, wherein the second filter protection circuit comprises: a second filter circuit and a protection circuit;
the second filter circuit is used for filtering and outputting the alternating current commercial power, and the protection circuit is used for protecting the first power supply branch.
9. The power supply circuit according to any one of claims 1-8, wherein the first branch switch comprises a door lock switch; or a relay switch and a door lock switch which are connected in series; or, a relay switch.
10. The power supply circuit of claim 9, further comprising: a second branch switch;
one end of the first branch switch is connected with a live wire of the alternating current commercial power, and the first branch switch is connected with the first power supply branch; one end of the second branch switch is connected with the zero line of the alternating current commercial power, and the other end of the second branch switch is connected with the first power supply branch.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004144.0A CN115733235A (en) | 2021-08-30 | 2021-08-30 | Power supply circuit |
| PCT/CN2022/115630 WO2023030274A1 (en) | 2021-08-30 | 2022-08-29 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004144.0A CN115733235A (en) | 2021-08-30 | 2021-08-30 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115733235A true CN115733235A (en) | 2023-03-03 |
Family
ID=85290938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111004144.0A Pending CN115733235A (en) | 2021-08-30 | 2021-08-30 | Power supply circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115733235A (en) |
| WO (1) | WO2023030274A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242113A (en) * | 2007-02-08 | 2008-08-13 | 佛山市顺德区顺达电脑厂有限公司 | Power supply system |
| CN101763157B (en) * | 2010-01-15 | 2012-04-11 | 旭丽电子(广州)有限公司 | Power supply device and control method and charging method thereof |
| EP3238333B1 (en) * | 2014-12-23 | 2019-05-29 | ABB Schweiz AG | Modular power converter |
| WO2017090099A1 (en) * | 2015-11-25 | 2017-06-01 | 三菱電機株式会社 | Power supply control device and power supply control method |
| CN110620425A (en) * | 2019-09-26 | 2019-12-27 | 广州供电局有限公司 | Power supply circuit and device for secondary equipment of power distribution room |
| CN110829585A (en) * | 2019-11-29 | 2020-02-21 | 苏州贝昂科技有限公司 | Double-circuit power supply device and power supply system |
| CN112968514B (en) * | 2020-08-20 | 2023-05-12 | 合肥海尔智能电子有限公司 | Power supply circuit and frequency conversion equipment |
-
2021
- 2021-08-30 CN CN202111004144.0A patent/CN115733235A/en active Pending
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2022
- 2022-08-29 WO PCT/CN2022/115630 patent/WO2023030274A1/en unknown
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| Publication number | Publication date |
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| WO2023030274A1 (en) | 2023-03-09 |
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