CN114337297A - Switching power supply's feedback circuit, switching power supply and consumer - Google Patents
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Abstract
The invention relates to a feedback circuit of a switching power supply, the switching power supply and electric equipment, wherein the feedback circuit is provided with a plurality of sub feedback loops which are connected in parallel at the output end of the switching power supply, the output signal of at least one sub feedback loop is selected as the feedback regulation signal of the switching power supply, the output signal of at least one sub feedback loop in the rest sub feedback loops is selected as the reference signal, and when the difference between the feedback regulation signal and the reference signal is larger, the reference signal is selected as the feedback regulation signal of the switching power supply, thereby realizing the self-check of the abnormity problem of the feedback loops, and when the sub feedback loop corresponding to the feedback regulation signal is abnormal, the switching power supply can still output stable voltage, and the user experience degree and the satisfaction degree are high.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a feedback circuit of a switching power supply, the switching power supply and electric equipment.
Background
In the prior art of a switching power supply, a feedback loop for adjusting output voltage is constructed by a common optical coupler and an adjustable precise shunt regulator, and the classical topology is composed of optical couplers PC817 and TL 431. But its circuit is more complex compared to the normal feedback loop and TL431 is more vulnerable to damage, which affects the normal use of the power supply. Under complex working conditions, a precise feedback loop is easier to damage, and potential safety hazards exist on load equipment.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a feedback circuit of a switching power supply, a switching power supply and an electric device, so as to solve the problem that the switching power supply cannot normally output a voltage due to an abnormal feedback loop element in the prior art.
According to a first aspect of embodiments of the present invention, there is provided a feedback circuit of a switching power supply, including:
the feedback loop is connected with the output end of the switching power supply and at least comprises two sub feedback loops connected in parallel;
and the controller is connected with the output end of the feedback loop and is used for selecting the output signal of at least one sub-feedback loop as the feedback regulation signal of the switching power supply, selecting the output signal of at least one sub-feedback loop in the rest sub-feedback loops as a reference signal and selecting the reference signal as the feedback regulation signal of the switching power supply when the difference between the feedback regulation signal and the reference signal is larger.
Preferably, if there are two sub-feedback loops, the accuracy of the output signal of one sub-feedback loop is higher than that of the output signal of the other sub-feedback loop; or,
and if the number of the sub-feedback loops is two, the output signal precision of the two sub-feedback loops is the same.
Preferably, if there are two sub-feedback loops, and the accuracy of the output signal of one of the sub-feedback loops is higher than that of the output signal of the other sub-feedback loop, the selecting the output signal of at least one sub-feedback loop as the feedback adjustment signal of the switching power supply specifically includes:
and selecting the output signal of the sub-feedback loop with higher output signal precision as the feedback regulation signal of the switching power supply, and selecting the output signal of the sub-feedback loop with lower output signal precision as the reference signal.
Preferably, if there are two sub-feedback loops and the output signals of the two sub-feedback loops have the same precision, the selecting the output signal of at least one sub-feedback loop as the feedback adjustment signal of the switching power supply specifically includes:
and randomly selecting an output signal of one sub-feedback loop as a feedback regulation signal of the switching power supply, and selecting an output signal of the other sub-feedback loop as the reference signal.
Preferably, the sub-feedback loop with higher accuracy of the output signal includes: a first voltage stabilization element U1, and a first optical coupler U3, wherein,
the first input end of the first optocoupler U3 is connected with the anode of the switching power supply through a resistor R5, and the second input end of the first optocoupler U3 is connected with the cathode of the first voltage stabilizing element U1; a resistor R6 is also connected between the first input end and the second input end of the first optocoupler U3;
the anode of the first voltage stabilizing element U1 is connected to the positive electrode of the switching power supply through a resistor R3, a resistor R2 and a resistor R1 which are connected in series, and the reference electrode thereof is connected to the second input terminal of the first optocoupler U3 through a capacitor C2 and a resistor R7 which are connected in series, and is also connected between the resistor R3 and the resistor R2.
Preferably, the sub-feedback loop with the output signal with lower precision comprises: a second voltage stabilizing element D2, and a second optical coupler U2, wherein,
a first input end of the second optocoupler U2 is connected to one end of the resistor R2 through the second voltage stabilizing element D2, and a second input end thereof is connected to the other end of the resistor R2; a resistor R4 is also connected between the first input terminal and the second input terminal of the second optocoupler U2.
Preferably, the types of the first voltage stabilization element U1 include: TL 431; and/or the presence of a gas in the gas,
the second voltage stabilization element D2 includes: and a voltage stabilizing tube.
According to a second aspect of embodiments of the present invention, there is provided a switching power supply including:
the feedback circuit of the switching power supply.
According to a third aspect of embodiments of the present invention, there is provided an electric device, including:
the switching power supply is described above.
Preferably, the power consumption device includes: a household appliance, and/or a commercial appliance.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the output end of the switching power supply is provided with a plurality of sub feedback loops connected in parallel, the output signal of at least one sub feedback loop is selected as the feedback regulation signal of the switching power supply, the output signal of at least one sub feedback loop in the rest sub feedback loops is selected as the reference signal, and when the difference between the feedback regulation signal and the reference signal is larger, the reference signal is selected as the feedback regulation signal of the switching power supply, so that the self-checking of the abnormal problem of the feedback loops is realized, when the sub feedback loop corresponding to the feedback regulation signal is abnormal, the switching power supply can still output stable voltage, and the switching power supply has good user experience degree and high satisfaction degree.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic block diagram of a feedback circuit of a switching power supply shown in accordance with an exemplary embodiment;
fig. 2 is a schematic diagram illustrating a feedback circuit of a switching power supply according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like 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 invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example one
Fig. 1 is a schematic block diagram illustrating a feedback circuit of a switching power supply according to an exemplary embodiment, the feedback circuit, as shown in fig. 1, including:
the feedback loop 11 is connected with the output end of the switching power supply 10 and at least comprises two sub feedback loops 111 which are connected in parallel;
and the controller 12 is connected to the output end of the feedback loop 11, and configured to select an output signal of at least one sub-feedback loop 111 as the feedback adjustment signal of the switching power supply 10, select an output signal of at least one sub-feedback loop of the remaining sub-feedback loops 111 as the reference signal, and select the reference signal as the feedback adjustment signal of the switching power supply 10 when the difference between the feedback adjustment signal and the reference signal is large.
It should be noted that the technical solution provided in this embodiment is applicable to a switching power supply. The switching power supply is installed in a power consumption device, the power consumption device including: a household appliance, and/or a commercial appliance. Wherein the household appliances include, but are not limited to: refrigerators, washing machines, fresh air blowers, air conditioners, smoke extractors, dust collectors, and the like.
It should be noted that the switching power supply includes at least: a chopper circuit and a feedback circuit.
Referring to fig. 1, in the feedback circuit, one end of a controller 12 is connected to the output end of the feedback loop, and the other end is connected to the input end of the chopper circuit, and the controller 12 adjusts parameters such as the frequency, the amplitude, the duty ratio, and the like of the output voltage of the switching power supply according to the output signal of the feedback loop.
In particular practice, the controller 12 may be a combination of one or more of the following:
PLC controller, singlechip, ARM treater, DSP treater, FPGA controller etc..
The "selecting the output signal of at least one sub-feedback loop as the feedback regulation signal of the switching power supply" includes:
selecting an output signal of one sub-feedback loop as a feedback regulation signal of the switching power supply; or,
and selecting output signals of the plurality of sub-feedback loops as feedback regulation signals of the switching power supply.
When the output signals of the plurality of sub-feedback loops are selected as the feedback adjustment signal of the switching power supply, an average value of the output signals of the plurality of sub-feedback loops may be used as the feedback adjustment signal of the switching power supply.
Similarly, selecting the output signal of at least one of the remaining sub-feedback loops as the reference signal includes:
selecting an output signal of one sub-feedback loop as a reference signal; or,
the output signals of the plurality of sub-feedback loops are selected as reference signals.
When the output signals of the plurality of sub-feedback loops are selected as the reference signal, an average value of the output signals of the plurality of sub-feedback loops may be used as the reference signal.
It can be understood that, in the technical scheme provided in this embodiment, a plurality of sub-feedback loops connected in parallel are arranged at the output end of the switching power supply, an output signal of at least one sub-feedback loop is selected as a feedback adjustment signal of the switching power supply, an output signal of at least one sub-feedback loop in the remaining sub-feedback loops is selected as a reference signal, and when a difference between the feedback adjustment signal and the reference signal is large, the reference signal is selected as the feedback adjustment signal of the switching power supply, so that self-checking of an abnormality problem of the feedback loop is realized, and when the sub-feedback loop corresponding to the feedback adjustment signal is abnormal, the switching power supply can still output a stable voltage, and the user experience degree is good, and the satisfaction degree is high.
In a specific practice, if the number of the sub-feedback loops is two, the accuracy of the output signal of one sub-feedback loop is higher than that of the output signal of the other sub-feedback loop; or,
and if the number of the sub-feedback loops is two, the output signal precision of the two sub-feedback loops is the same.
In a specific practice, if the number of the sub-feedback loops is two, and the accuracy of the output signal of one of the sub-feedback loops is higher than that of the output signal of the other sub-feedback loop, the selecting the output signal of at least one sub-feedback loop as the feedback adjustment signal of the switching power supply specifically includes:
and selecting the output signal of the sub-feedback loop with higher output signal precision as the feedback regulation signal of the switching power supply, and selecting the output signal of the sub-feedback loop with lower output signal precision as the reference signal.
In a specific practice, if there are two sub-feedback loops and the output signals of the two sub-feedback loops have the same precision, the selecting the output signal of at least one sub-feedback loop as the feedback adjustment signal of the switching power supply specifically includes:
and randomly selecting an output signal of one sub-feedback loop as a feedback regulation signal of the switching power supply, and selecting an output signal of the other sub-feedback loop as the reference signal.
In a specific practice, referring to fig. 2, the sub-feedback loop with higher accuracy of the output signal includes: a first voltage stabilization element U1, and a first optical coupler U3, wherein,
the first input end of the first optocoupler U3 is connected with the anode of the switching power supply through a resistor R5, and the second input end of the first optocoupler U3 is connected with the cathode of the first voltage stabilizing element U1; a resistor R6 is also connected between the first input end and the second input end of the first optocoupler U3;
the anode of the first voltage stabilizing element U1 is connected to the positive electrode of the switching power supply through a resistor R3, a resistor R2 and a resistor R1 which are connected in series, and the reference electrode thereof is connected to the second input terminal of the first optocoupler U3 through a capacitor C2 and a resistor R7 which are connected in series, and is also connected between the resistor R3 and the resistor R2.
In a specific practice, referring to fig. 2, the sub-feedback loop with the output signal with lower precision comprises: a second voltage stabilizing element D2, and a second optical coupler U2, wherein,
a first input end of the second optocoupler U2 is connected to one end of the resistor R2 through the second voltage stabilizing element D2, and a second input end thereof is connected to the other end of the resistor R2; a resistor R4 is also connected between the first input terminal and the second input terminal of the second optocoupler U2.
Preferably, the types of the first voltage stabilization element U1 include: TL 431; and/or the presence of a gas in the gas,
the second voltage stabilization element D2 includes: and a voltage stabilizing tube.
It can be understood that for the sub-feedback loop with low output signal precision, the voltage divided by the resistor R2 is dropped by the voltage regulator D2, and then fed back to the controller through the second optocoupler U2. Wherein, R4 is used as bias resistance of D2, and can stabilize current within the rated current value range of D2.
For the sub-feedback loop with high output signal precision, the voltage divided by the resistor R3 is compared with the 2.5V bandgap reference voltage in the TL431, an error voltage is formed on the cathode, and the error voltage is fed back to the controller through the first optocoupler U3. Wherein, R5 is used for adjusting the direct current gain of the feedback loop, C2 and R7 are used for phase compensation of the control loop, and R6 is the bias resistance of TL431, so that the current is stabilized within the rated current value range of TL 431.
It can be understood that, according to the technical scheme provided by this embodiment, the sub-feedback loop with high output signal precision is more complex, wherein the damage of any element will greatly affect the output voltage, and the TL431 is used as an adjustable precision parallel regulator, and the limitation of the working environment is greater than that of a common voltage regulator tube, so that the element damage is easily caused by the external environment, and the sub-feedback loop with high output signal precision is abnormal.
When the switching power supply is used, the controller can receive voltage signals fed back by the two feedback loops, the feedback of the two feedback loops is similar under normal conditions, the self-checking of the feedback can be carried out, and if the difference between the output signal of the sub-feedback loop with higher output signal precision and the output signal of the sub-feedback loop with lower output signal precision is larger, the working environment can be judged to be abnormal, and the sub-feedback loop with higher output signal precision is damaged.
When the feedback abnormality is not detected, the output signal of the sub-feedback loop with lower output signal precision is only used as a reference signal for abnormality judgment, and the output signal of the sub-feedback loop with higher output signal precision is used as a feedback regulation signal of the switching power supply, so that the winding parameter at the primary side of the switching power supply is regulated. When the difference of the two feedback signals is large, the output signal of the sub-feedback loop with low output signal precision is used as the feedback regulation signal to carry out voltage stabilization, and the problem that the switching power supply cannot normally output voltage due to the abnormality of the feedback loop element in the prior art is solved.
Example two
A switching power supply is shown according to an exemplary embodiment, comprising:
the feedback circuit of the switching power supply.
It should be noted that the switching power supply includes at least: a chopper circuit and a feedback circuit.
Referring to fig. 1, in the feedback circuit, one end of a controller 12 is connected to the output end of the feedback loop, and the other end is connected to the input end of the chopper circuit, and the controller 12 adjusts parameters such as the frequency, the amplitude, the duty ratio, and the like of the output voltage of the switching power supply according to the output signal of the feedback loop.
Referring to fig. 2, the high frequency transformer T1, the rectifier diode D1, and the output filter capacitor C1 are all components of the chopper circuit.
It can be understood that, in the technical scheme provided in this embodiment, a plurality of sub-feedback loops connected in parallel are arranged at the output end of the switching power supply, an output signal of at least one sub-feedback loop is selected as a feedback adjustment signal of the switching power supply, an output signal of at least one sub-feedback loop in the remaining sub-feedback loops is selected as a reference signal, and when a difference between the feedback adjustment signal and the reference signal is large, the reference signal is selected as the feedback adjustment signal of the switching power supply, so that self-checking of an abnormality problem of the feedback loop is realized, and when the sub-feedback loop corresponding to the feedback adjustment signal is abnormal, the switching power supply can still output a stable voltage, and the user experience degree is good, and the satisfaction degree is high.
EXAMPLE III
An electrical device is shown according to an exemplary embodiment, comprising:
the switching power supply is described above.
Preferably, the power consumption device includes: a household appliance, and/or a commercial appliance.
Wherein the household appliances include, but are not limited to: refrigerators, washing machines, fresh air blowers, air conditioners, smoke extractors, dust collectors, and the like.
It can be understood that, in the technical scheme provided in this embodiment, a plurality of sub-feedback loops connected in parallel are arranged at the output end of the switching power supply, an output signal of at least one sub-feedback loop is selected as a feedback adjustment signal of the switching power supply, an output signal of at least one sub-feedback loop in the remaining sub-feedback loops is selected as a reference signal, and when a difference between the feedback adjustment signal and the reference signal is large, the reference signal is selected as the feedback adjustment signal of the switching power supply, so that self-checking of an abnormality problem of the feedback loop is realized, and when the sub-feedback loop corresponding to the feedback adjustment signal is abnormal, the switching power supply can still output a stable voltage, and the user experience degree is good, and the satisfaction degree is high.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
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.
It should be understood that portions 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.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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, the schematic representations of the terms used above 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.
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 feedback circuit for a switching power supply, comprising:
the feedback loop is connected with the output end of the switching power supply and at least comprises two sub feedback loops connected in parallel;
and the controller is connected with the output end of the feedback loop and is used for selecting the output signal of at least one sub-feedback loop as the feedback regulation signal of the switching power supply, selecting the output signal of at least one sub-feedback loop in the rest sub-feedback loops as a reference signal and selecting the reference signal as the feedback regulation signal of the switching power supply when the difference between the feedback regulation signal and the reference signal is larger.
2. The feedback circuit of claim 1,
if the number of the sub-feedback loops is two, the precision of the output signal of one sub-feedback loop is higher than that of the output signal of the other sub-feedback loop; or,
and if the number of the sub-feedback loops is two, the output signal precision of the two sub-feedback loops is the same.
3. The feedback circuit according to claim 2, wherein if the sub-feedback loops are two, and the accuracy of the output signal of one of the sub-feedback loops is higher than that of the output signal of the other sub-feedback loop, the selecting the output signal of at least one sub-feedback loop as the feedback regulation signal of the switching power supply comprises:
and selecting the output signal of the sub-feedback loop with higher output signal precision as the feedback regulation signal of the switching power supply, and selecting the output signal of the sub-feedback loop with lower output signal precision as the reference signal.
4. The feedback circuit according to claim 2, wherein if there are two sub-feedback loops and the output signals of the two sub-feedback loops have the same precision, the selecting the output signal of at least one sub-feedback loop as the feedback adjustment signal of the switching power supply comprises:
and randomly selecting an output signal of one sub-feedback loop as a feedback regulation signal of the switching power supply, and selecting an output signal of the other sub-feedback loop as the reference signal.
5. The feedback circuit of claim 3, wherein the sub-feedback loop with higher accuracy of the output signal comprises: a first voltage stabilization element U1, and a first optical coupler U3, wherein,
the first input end of the first optocoupler U3 is connected with the anode of the switching power supply through a resistor R5, and the second input end of the first optocoupler U3 is connected with the cathode of the first voltage stabilizing element U1; a resistor R6 is also connected between the first input end and the second input end of the first optocoupler U3;
the anode of the first voltage stabilizing element U1 is connected to the positive electrode of the switching power supply through a resistor R3, a resistor R2 and a resistor R1 which are connected in series, and the reference electrode thereof is connected to the second input terminal of the first optocoupler U3 through a capacitor C2 and a resistor R7 which are connected in series, and is also connected between the resistor R3 and the resistor R2.
6. The feedback circuit of claim 5, wherein the sub-feedback loop with less accurate output signal comprises: a second voltage stabilizing element D2, and a second optical coupler U2, wherein,
a first input end of the second optocoupler U2 is connected to one end of the resistor R2 through the second voltage stabilizing element D2, and a second input end thereof is connected to the other end of the resistor R2; a resistor R4 is also connected between the first input terminal and the second input terminal of the second optocoupler U2.
7. The feedback circuit of claim 6,
the types of the first voltage stabilizing element U1 include: TL 431; and/or the presence of a gas in the gas,
the second voltage stabilization element D2 includes: and a voltage stabilizing tube.
8. A switching power supply, comprising:
a feedback circuit of a switching power supply according to any one of claims 1 to 7.
9. An electrical device, comprising:
the switching power supply of claim 8.
10. The powered device of claim 9, comprising:
a household appliance, and/or a commercial appliance.
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