CN108365745B - Switching power supply and cooking device - Google Patents

Switching power supply and cooking device Download PDF

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Publication number
CN108365745B
CN108365745B CN201810387255.6A CN201810387255A CN108365745B CN 108365745 B CN108365745 B CN 108365745B CN 201810387255 A CN201810387255 A CN 201810387255A CN 108365745 B CN108365745 B CN 108365745B
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electrolytic capacitor
power supply
resistor
switching power
rectifying
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CN108365745A (en
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张云祥
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Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
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Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
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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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • 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
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

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  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a switching power supply which comprises a first rectifying part and a second rectifying part. The first rectifying portion includes a first electrolytic capacitor, and the first rectifying portion is configured to rectify the output voltage when the first electrolytic capacitor is enabled. The second rectifying portion includes a second electrolytic capacitor, and the second rectifying portion is configured to rectify the output voltage when the first electrolytic capacitor fails. The invention also discloses a cooking device. According to the switching power supply and the cooking equipment, the second electrolytic capacitor is arranged, and the second electrolytic capacitor works when the first electrolytic capacitor fails, so that the first electrolytic capacitor is reserved, and the service life of the switching power supply is effectively prolonged.

Description

Switching power supply and cooking device
Technical Field
The invention relates to household appliances, in particular to a switching power supply and cooking equipment.
Background
The switching power supply generally comprises an electrolytic capacitor, however, the electrolytic capacitor has volatility and short service life when working at high temperature, so that the switching power supply is easy to damage and short in service life, and users often cannot effectively judge whether the electrolytic capacitor reaches the service life.
Disclosure of Invention
Embodiments of the present invention provide a switching power supply and a cooking apparatus.
The switching power supply of the embodiment of the invention comprises:
a first rectifying section including a first electrolytic capacitor, the first rectifying section being configured to rectify an output voltage when the first electrolytic capacitor is enabled; and
a second rectifying portion including a second electrolytic capacitor, the second rectifying portion being configured to rectify the output voltage when the first electrolytic capacitor fails.
In some embodiments, the switching power supply further includes a gating element for gating the first rectifying part or the second rectifying part to enable the first electrolytic capacitor or the second electrolytic capacitor.
In certain embodiments, the gating element comprises a relay comprising a first contact and a second contact, the first electrolytic capacitor being connected to the first contact, the second electrolytic capacitor being connected to the second electrolytic capacitor.
In certain embodiments, the relay communicates with the second contact when not powered and communicates with the first contact when powered while the first electrolytic capacitor is active.
In certain embodiments, the relay remains in communication with the second contact upon failure of the first electrolytic capacitor.
In some embodiments, the second electrolytic capacitor is charged at power-up instant.
In some embodiments, the first rectifying portion further includes a first resistor, a second resistor, and a first switching element, and the second resistor is used to divide voltage to turn on the first switching element to enable the first rectifying portion.
In some embodiments, the first switching element includes a diode and a transistor, a base of the transistor is connected to an anode of the diode, a cathode of the diode is connected to a first end of the second resistor, an emitter of the transistor is connected to a second end of the second resistor, and a collector of the transistor is connected to the gating element.
In some embodiments, the second rectifying portion includes a third resistor, a fourth resistor, and a second switching element, and the fourth resistor is used to divide the voltage to turn on the second switching element to enable the second rectifying portion.
In some embodiments, the second switching element comprises a triac.
In some embodiments, the second switching element is turned on to enable the second rectifying section when a ripple voltage of the output voltage is greater than a predetermined value, and the first switching element is turned on to enable the first rectifying section when the ripple voltage of the output voltage is less than the predetermined value.
The cooking device comprises the switching power supply.
In some embodiments, the cooking apparatus comprises a microwave oven.
According to the switching power supply and the cooking equipment, the second electrolytic capacitor is arranged, and the second electrolytic capacitor works when the first electrolytic capacitor fails, so that the first electrolytic capacitor is reserved, and the service life of the switching power supply is effectively prolonged.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram schematically illustrating a configuration of a switching power supply according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a switching power supply according to an embodiment of the present invention.
FIG. 3 is a graph showing the relationship between the life of the electrolytic capacitor and the capacity and loss angle of the electrolytic capacitor according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of the ripple voltage as a function of the age of the electrolytic capacitor according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of illustrating the embodiments of the present invention and are not to be construed as limiting the embodiments of the present invention.
Referring to fig. 1 and 2, a switching power supply 100 according to an embodiment of the present invention includes a first rectifying portion 10 and a second rectifying portion 20. The first rectifying unit 10 includes a first electrolytic capacitor 11, and the second rectifying unit 20 includes a second electrolytic capacitor 21. The first rectifying unit 10 is used to rectify the output voltage when the first electrolytic capacitor 11 is enabled. The second rectifying unit 20 is configured to rectify the output voltage by the second electrolytic capacitor 21 when the first electrolytic capacitor 11 fails.
The switching power supply 100 of the embodiment of the present invention may be applied to a cooking appliance of the embodiment of the present invention, which may be a microwave oven, an induction cooker, or the like. In addition, the switching power supply 100 may also be applied to other household appliances, and is not particularly limited.
Specifically, the switching power supply 100 is applied to a household appliance for converting an input ac power into a dc power required by a user terminal. Generally, the switching power supply 100 includes an electrolytic capacitor for rectifying and smoothing an output voltage. The lifetime of an electrolytic capacitor often determines the lifetime of the entire switching power supply, and the lifetime of an electrolytic capacitor is related to the ambient temperature of its long-term operation, and generally, the higher the temperature, the shorter the lifetime of an electrolytic capacitor. In order to miniaturize the switching power supply and the electronic device, the temperature of the operating environment of the electrolytic capacitor is generally high, and a capacitor with a large capacity cannot be used. In addition, since the electrolyte in the electrolytic capacitor has a certain volatility, the electrolytic capacitor also suffers a capacity loss when stored at room temperature or in a non-use state. When the service life of the electrolytic capacitor is reached, the switching power supply cannot work, and related workers need to manually replace the electrolytic capacitor if the switching power supply needs to be continuously used.
Specifically, the calculation formula of the life of the electrolytic capacitor is as follows:
Figure BDA0001642556870000041
wherein L is the service life of the electrolytic capacitor when the ambient temperature is T, L0The rated life of the electrolytic capacitor at the maximum temperature.
As the service time of the electrolytic capacitor increases, the capacity of the electrolytic capacitor is reduced, the internal resistance value is increased, and the ripple voltage during operation is increased.
Referring to fig. 3, in one example, according to the relationship between the life and capacity of the electrolytic vessel and the loss angle, when the ambient temperature is 100 degrees celsius and the electrolytic vessel is used for 10000 hours, the capacity is reduced by 25%, the loss angle is 1.5, and the formula is calculated according to the loss angle,
Figure BDA0001642556870000051
initially, tan θ is 0.07, C4400 μ F, and R is 0.04 Ω. After 10000 hours of use, tan θ is 0.12, C4400 μ F, and R is 0.45 Ω.
The ripple voltage calculation formula is as follows:
Figure BDA0001642556870000052
wherein, Δ iLFor ripple current, VoTo output a voltage, ViESR is equivalent series resistance of capacitor C, fzIs the switching frequency. In general, the ESR of a capacitor is in the range of tens to tens of milliohms, and according to this calculation formula, the ESR has a larger influence on the ripple voltage for the part in parentheses. Generally, when the capacitance is greater than 330 μ F, the internal resistance is substantially equal to ESR. It follows that as the usage time increases, the internal resistance increases and the ripple voltage increases.
In the embodiment of the present invention, the first rectifying unit 10 is a circuit in which the first electrolytic capacitor 11 is located, and the first rectifying unit 10 is configured to rectify the output voltage when the first electrolytic capacitor 11 is enabled. The first electrolytic capacitor 11 enables a state in which the first electrolytic capacitor 11 has not reached the lifetime and can be normally used. It is to be understood that when the first electrolytic capacitor 11 can be used normally, the second electrolytic capacitor 21 is stored normally as a backup electrolytic capacitor in the switching power supply 100, and in some examples, the backup electrolytic capacitor can be charged periodically to extend its storage life. When the first electrolytic capacitor 11 is out of service, i.e. reaches its service life, the second electrolytic capacitor 21 is in effect, and its circuit is the second rectifying portion 20, which is used to rectify the output voltage.
It is understood that the design of the dual electrolytic capacitor of the embodiment of the present invention effectively extends the service life of the switching power supply 100 under the same usage environment, relative to a switching power supply including only one electrolytic capacitor. In one example, the comparison switch power supply includes only one electrolytic capacitor with a capacitance of 10 μ F, and the switch power supply 100 of the embodiment of the invention has a capacitance of 10 μ F for the first electrolytic capacitor 11, a capacitance of 10 μ F for the second electrolytic capacitor 21, and an operating environment temperature of 80 degrees celsius. The life of the electrolytic capacitor of the control group was 2.54 years, and correspondingly, in the switching power supply 100 according to the embodiment of the present invention, the life of the first electrolytic capacitor 11 was 2.54 years, and in 2.54 years when the first electrolytic capacitor 11 was enabled, the capacitance of the second electrolytic capacitor 21 volatilized and attenuated by 53%, and under the same conditions, the second electrolytic capacitor 21 could continue to operate for 2.02 years. Under the same working environment, the service life of the switching power supply 100 is 4.56 years, which is prolonged by 2.02 years compared with the switching power supply of the comparison group.
In another example, the comparison switch power supply includes only one electrolytic capacitor with a capacitance of 10 μ F, and the switch power supply 100 of the embodiment of the invention has a capacitance of 10 μ F for the first electrolytic capacitor 11, a capacitance of 10 μ F for the second electrolytic capacitor 21, and a working environment temperature of 100 degrees celsius. The life of the electrolytic capacitor of the control group was 0.56 years, and correspondingly, in the switching power supply 100 according to the embodiment of the present invention, the life of the first electrolytic capacitor 11 was 0.56 years, and the second electrolytic capacitor 21 was able to continue operating for 0.45 years under the same conditions in which the capacitance of the second electrolytic capacitor 21 was volatilized and attenuated by 32% in 0.56 years when the first electrolytic capacitor 11 was enabled. Under the same working environment, the service life of the switching power supply 100 is 1.01 years, which is 0.45 years longer than that of the switching power supply of the control group.
In addition, it can be understood that, because the temperature inside the switching power supply is high, in order to prolong the service life of the electrolytic capacitor properly, a proper heat dissipation means is required, for example, a heat dissipation element such as a heat dissipation fin or a fan is added, so that the volume of the switching power supply is inevitably increased.
In summary, the switching power supply 100 and the cooking device according to the embodiment of the invention operate when the first electrolytic capacitor 11 fails by providing the second electrolytic capacitor 21, so as to form a backup of the first electrolytic capacitor 11, thereby effectively prolonging the service life of the switching power supply 100. Meanwhile, the miniaturized design of the switching power supply 100 is facilitated and the cost can be saved.
In some embodiments, the switching power supply 100 further includes a gating element 30, and the gating element 30 is used to gate the first rectifying part 10 or the second rectifying part 20 to enable the first electrolytic capacitor 11 when the first rectifying part 10 is gated and enable the second electrolytic capacitor 21 when the second rectifying part 20 is gated.
Preferably, in such an embodiment, the gating element 30 may be a relay. The relay is a two-node relay and comprises a first contact point a and a second contact point b. The first electrolytic capacitor 11 is connected to the first contact a, and the second electrolytic capacitor b is connected to the second electrolytic capacitor 21.
In particular, a relay may generally be used as a switch for a selection circuit, with two contacts connected to respective electrolytic capacitors located in two circuits, which are enabled when a circuit is gated. When not powered, the node of the relay is connected with the second contact b. After power-up, the node of the relay is connected to the first contact a, the first rectifying unit 10 is turned on, and the first electrolytic capacitor 11 is operated.
It will be understood that the above is the case when the first electrolytic capacitor 11 is active, i.e. has not reached its useful life, and when the first electrolytic capacitor 11 fails, the relay remains in communication with the second contact b, both when it is not powered and when it is powered.
That is, when the first electrolytic capacitor 11 is in operation, the contact of the relay is connected to the first contact a, and when the first electrolytic capacitor 11 has reached the end of its life, the contact of the relay is connected to the second contact b.
The contact gate of the relay is determined according to the life of the first electrolytic capacitor 11, and when the first electrolytic capacitor 11 is judged not to reach the life, the first rectifying unit 10 is turned on to operate the first electrolytic capacitor 11, and when the first electrolytic capacitor 11 reaches the life, the second rectifying unit 20 is turned on to operate the second electrolytic capacitor 21.
In some examples, the determination of the lifetime of the first electrolytic capacitor 11 may be determined based on a detected electrolytic capacitor related parameter, such as a capacitance value. In other examples, the determination of the lifetime of the first electrolytic capacitor 11 may be determined according to an electrical parameter of the first rectifying portion 10 where the first electrolytic capacitor is located, for example, a voltage division relationship between the first rectifying portion 10 and the second rectifying portion 20.
In some embodiments, the first rectifying portion 10 further includes a first resistor 12, a second resistor 13, and a first switching element 14. The first resistor 12 is connected in series with the second resistor 13, and the first switching element 14 is connected with the second resistor 13, and turns on the first rectifying unit 10 according to the voltage division of the second resistor 13.
Preferably, in such an embodiment, the first switching element 14 includes a diode 141 and a transistor 142, a base B of the transistor 142 is connected to an anode of the diode, a cathode of the diode is connected to a first end of the second resistor 13, an emitter E of the transistor 142 is connected to a second end of the second resistor 13, and a collector C of the transistor 142 is connected to the gating element 30.
Specifically, the diode and the transistor have a conducting voltage, and thus can be used as a switching element in the circuit, and in the present embodiment, when the divided voltage of the second resistor 12 exceeds the conducting voltage of the base-emitter of the diode 141 and the transistor 142, the contact of the relay is switched from the second contact b to the first contact a, so that the first rectifying portion 10 and the first electrolytic capacitor 11 operate. The on-state voltage of the diode 141 is slightly higher than the on-state voltage of the base electrode-emitter electrode of the transistor 142, so that the mis-conduction of the transistor 142 can be effectively prevented.
Further, in such an embodiment, the second rectifying unit 20 includes a third resistor 22, a fourth resistor 23, and a second switching element 24, and the fourth resistor 23 is used to divide the voltage to turn on the second switching element 24 to enable the second rectifying unit 20.
Specifically, whether the first switching element 14 or the second switching element 24 is turned on or off is determined based on the respective divided voltages of the second resistor 13 and the fourth resistor 23, and when the first electrolytic capacitor 11 does not reach the lifetime, the divided voltage of the second resistor 13 may turn on the first rectifying portion 10, and when the first electrolytic capacitor 11 reaches the lifetime, the divided voltage of the fourth resistor 23 may turn on the second rectifying portion 20 and the second electrolytic capacitor 21 operates.
Preferably, the second switching element 24 comprises a triac. The bidirectional thyristor connecting pipe comprises two unidirectional thyristors which are connected in reverse parallel and two resistors. The thyristor has good sensitivity and voltage resistance, and is usually used as a switching element in high-power electronic circuits such as rectification, inversion, voltage regulation and the like. The two resistors and the two thyristors form a loop, and when the first electrolytic capacitor 11 reaches the service life, the voltage division of the fourth resistor 23 makes the bidirectional thyristor conduct, so that the contact of the relay is held at the second contact a, the second rectifying portion 20 conducts, and the second electrolytic capacitor 21 operates.
Referring to fig. 4, specifically, as the service life of the first electrolytic capacitor 11 increases, the service life thereof becomes shorter, the capacity thereof decreases, the loss tangent thereof increases, the ripple voltage in the output voltage increases, when the ripple voltage increases to a predetermined value, for example, in some examples, when the ripple voltage increases to 43v, the divided voltage of the resistor of the fourth resistor 23 will turn on the second switching element 24, and at this time, the divided voltage of the second resistor 13 is not enough to turn on the first switching element 14, that is, the transistor 142 keeps the off state. The contact of the relay is always held at the second contact b, and the second electrolytic capacitor 21 operates. It is understood that when the ripple voltage increases to 43v, the first electrolytic capacitor 11 can be considered to have reached the service life.
That is, in the present embodiment, it is not necessary to use any other means or element for detecting the lifetime of the first electrolytic capacitor 11 or detecting the ripple voltage, and only the first electrolytic capacitor 11 naturally attenuates to change the circuit partial voltage, and different rectifier portions are turned on to realize automatic switching of the electrolytic capacitors, and manual switching by the operator is not necessary, and the operation is simple.
It should be noted that fig. 4 is only a reference waveform diagram shown by an oscilloscope, and an oscilloscope or other controller is not required to be arranged in an actual circuit design to monitor the ripple voltage.
Further, in the present embodiment, when the second electrolytic capacitor 21 is used as a backup electrolytic capacitor, the contact of the relay is connected to the second contact b when the power is not supplied, the contact of the relay does not immediately switch to the first contact a at the moment of the initial stage of the power supply, and the second electrolytic capacitor 21 is charged until the second electrolytic capacitor is switched to the first contact a. In this way, the switching power supply 100 is charged as a backup electrolytic capacitor at the instant of power-on each time, and is disconnected during operation, which is advantageous for long-term storage of the second electrolytic capacitor 21.
In some embodiments, the circuit design of the embodiments of the present invention may also be applied to other technical fields that require application of an electrolytic capacitor besides a switching power supply, such as the vehicle industry, security industry, medical electronics, medium and large electronic devices, and the like, and the design of the backup capacitor and the automatic switching may effectively prolong the life of the circuit where the electrolytic capacitor is located.
In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The above disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, specific example components and arrangements are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A switching power supply, comprising:
a first rectifying section including a first electrolytic capacitor, the first rectifying section being configured to filter an output voltage when the first electrolytic capacitor is enabled; and
a second rectifying portion including a second electrolytic capacitor, the second rectifying portion being configured to filter the output voltage when the first electrolytic capacitor fails;
the switching power supply further includes a gating element for gating the first rectifying part or the second rectifying part to enable the first electrolytic capacitor or the second electrolytic capacitor;
the first rectifying part further comprises a first resistor, a second resistor and a first switching element, wherein the first resistor and the second resistor form a first voltage dividing circuit, the first voltage dividing circuit is connected with the output end of the first rectifying part, and the second resistor is used for dividing voltage to enable the first switching element to be turned on so as to enable the first rectifying part;
the second rectifying part comprises a third resistor, a fourth resistor and a second switching element, the third resistor and the fourth resistor form a second voltage division circuit, the second voltage division circuit is connected with the output end of the second rectifying part, and the fourth resistor is used for voltage division to enable the second switching element to be turned on so as to enable the second rectifying part;
when the first electrolytic capacitor has reached the end of its life and has failed, the fourth resistance-divided voltage enables the second rectifying unit to operate the second electrolytic capacitor.
2. The switching power supply according to claim 1, wherein said gating element comprises a relay including a first contact and a second contact, said first electrolytic capacitor being connected to said first contact, said second electrolytic capacitor being connected to said second contact.
3. The switching power supply as claimed in claim 2, wherein said relay communicates with said second contact when not energized and communicates with said first contact when energized while said first electrolytic capacitor is active.
4. The switching power supply according to claim 2, wherein said relay maintains communication with said second contact upon failure of said first electrolytic capacitor.
5. The switching power supply according to claim 3, wherein said second electrolytic capacitor is charged at a power-on instant.
6. The switching power supply according to claim 1, wherein the first switching element includes a diode and a transistor, a base of the transistor is connected to an anode of the diode, a cathode of the diode is connected to a first terminal of the second resistor, an emitter of the transistor is connected to a second terminal of the second resistor, and a collector of the transistor is connected to a gating element.
7. The switching power supply of claim 1, wherein the second switching element comprises a triac.
8. The switching power supply according to claim 1, wherein the second switching element is turned on to enable the second rectifying section when a ripple voltage of the output voltage is greater than a predetermined value, and the first switching element is turned on to enable the first rectifying section when the ripple voltage of the output voltage is less than the predetermined value.
9. Cooking device, characterized in that it comprises a switching power supply according to any one of claims 1-8.
10. The cooking apparatus of claim 9, wherein the cooking apparatus comprises a microwave oven.
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JP2007038735A (en) * 2005-08-01 2007-02-15 Hiroyuki Kamegawa Battery back-up power source device with switch function
CN2904458Y (en) * 2006-05-19 2007-05-23 深圳晶辰电子科技股份有限公司 Combined valley filling method passive PFC circuit
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CN202634277U (en) * 2012-06-07 2012-12-26 广州雄智照明实业有限公司 Redundance ultra-long life switch power supply
CN203504280U (en) * 2013-09-16 2014-03-26 福建省力得自动化设备有限公司 Direct current power supply under-voltage automatic switching system based on microprocessor power supply monitor
CN207039275U (en) * 2017-08-17 2018-02-23 深圳市星鼎源科技有限公司 A kind of communication apparatus voltage stabilizing charger circuit
CN208190512U (en) * 2018-04-26 2018-12-04 广东美的厨房电器制造有限公司 Switching power supply and cooking equipment

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