CN113241751B - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN113241751B CN113241751B CN202110425341.3A CN202110425341A CN113241751B CN 113241751 B CN113241751 B CN 113241751B CN 202110425341 A CN202110425341 A CN 202110425341A CN 113241751 B CN113241751 B CN 113241751B
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a power supply circuit, which comprises a control module, a first channel, a second channel, a first filter capacitor and a second filter capacitor, wherein when a load is in a normal working state, a power module supplies power to the load through the first channel, when the load is in a standby working state, the power module supplies power to the load through the second channel, and because the capacity of the second filter capacitor is smaller than that of the first filter capacitor, after the power module is controlled to be closed in the standby working state, the time for supplying power to the load by the second filter capacitor can be reduced, namely, the power-down duration of the load in the standby working state can be reduced, so that the condition that the load operation fails due to overlong power-down duration of the load in the standby working state is avoided.
Description
Technical Field
The invention relates to the field of power supply, in particular to a power supply circuit.
Background
Referring to fig. 1, fig. 1 is a schematic diagram of a power supply circuit in the prior art. The power supply circuit comprises a capacitor, and the capacitor is used for filtering noise waves in the output voltage of the power supply module so as to enable the load to work normally. At present, many loads have a standby function, such as intelligent lighting products, and the like, and the loads are usually in a standby operating state through software control so as to reduce power consumption. Specifically, when the load is in a normal operating state, the power module supplies power to the load at a normal current, and when the load is in a standby state, the power module supplies power to the load at a working current smaller than the normal current. In the standby state, if the power module is turned off to enable the load to exit the standby state and further enable the load to be powered off, due to the fact that a certain amount of electric quantity is stored in the capacitor, even if the power module is turned off, the capacitor can supply power to the load, the load can be maintained in the standby state within a period of time, and the load cannot exit the standby state and the power off is achieved until the electric quantity stored in the capacitor is consumed. Before the power stored in the capacitor is not consumed, if the power module is turned on to restart or otherwise operate the load, the load may not exit the standby state, that is, the power is not turned off, and thus the restart or other operations may fail. In addition, if the prior art directly uses a filter capacitor with a small capacitance, noise waves cannot be normally filtered, and normally filtering the noise waves is a necessary condition for normal operation of a circuit, so that the filter capacitor with a large capacitance value must be selected under the prior art condition.
Use intelligent lighting product as an example, current intelligent lighting product all has the standby function, under the condition that does not close the wall switch, makes lamps and lanterns close through the module of control intelligent lighting product such as removal end APP (Application), only consumes standby power consumption under the standby state, and standby power consumption is the better the lower. Under the condition of lower standby power consumption, the working current of the module is much smaller than that of the module in normal work, so that the power failure maintaining time of the module for supplying power in a standby state is longer, and the module is electrified in a short time after power failure, so that some functions under the normal work condition are caused, and abnormity occurs. For example, in a standby state, the switch is turned on again after being turned off quickly, and the product cannot be normally lighted up and is kept in an off state all the time. The reason is that: under the standby condition, the current consumption of the module is less, and when the power supply is turned off, the electrolytic capacitor in the circuit can store a part of electric quantity, so that even if the power supply is cut off, the module can supply power for a period of time through the electrolytic capacitor, and the module can stop working only when the module consumes the electric quantity of the electrolytic capacitor to a degree that the module cannot support the module to work; if the module is powered up again before the power of the electrolytic capacitor is consumed, the module is not powered off and restarted, and is still kept in a standby state, so that the light-emitting diode (LED) cannot be driven to send a control signal, and the lamp cannot be lighted. In addition, if the network function of the existing intelligent lamp product needs to be reset, a method of repeatedly switching on and off is mostly adopted. If the switch is switched on and off rapidly in the standby state, the module is not powered off and restarted due to the short switch interval time, and the phenomenon that the product cannot be reset normally can occur. Both of these problems detract from the product experience.
To solve the above technical problem, please refer to fig. 2, fig. 2 is a schematic diagram of another power supply circuit in the prior art, and specifically, a resistor is connected to a front end of a load to eliminate the power stored in a capacitor in a standby state.
Disclosure of Invention
The invention aims to provide a power supply circuit, which can reduce the time for a second filter capacitor to supply power to a load after a power supply module is controlled to be closed in a standby working state, namely, can reduce the power-down duration of the load in the standby working state, so as to avoid the condition that the load operation fails due to overlong power-down duration of the load in the standby working state.
In order to solve the technical problem, the invention provides a power supply circuit, which comprises a control module, a first channel, a second channel, a first filter capacitor and a second filter capacitor, wherein the capacity of the second filter capacitor is smaller than that of the first filter capacitor;
the control module is used for controlling the first channel to be conducted when the load is in a normal working state, so that the power module supplies power to the load through the first channel; when the load is in a standby working state, controlling the second channel to be conducted so that the power module supplies power to the load through the second channel;
the first filter capacitor is used for filtering noise waves in a power supply output by the power supply module when the power supply module is started, and supplying power to the load through the first channel when the power supply module is closed in a normal working state;
the second filter capacitor is used for filtering noise waves in a power supply output by the power supply module when the power supply module is started, and is closed in a standby working state when the power supply module is closed, the second channel supplies power to the load.
Preferably, the control module comprises:
the sampling module is used for collecting the working current of the load;
the judging module is used for judging the working state of the load according to the working current and controlling the first channel to be conducted when the load is in a normal working state so as to enable the power supply module to supply power to the load through the first channel; and when the load is in a standby working state, controlling the second channel to be conducted so that the power module supplies power to the load through the second channel.
Preferably, the sampling module includes a sampling resistor, wherein a first end of the sampling resistor is connected to the output end of the first channel and the output end of the second channel, and a second end of the sampling resistor is connected to the power supply end of the load and the input end of the judging module, respectively;
the judgment module is specifically used for judging whether the voltage of the input end of the judgment module is smaller than a reference voltage, if so, the judgment module judges that the load is in a normal working state and controls the first channel to be conducted so as to enable the power module to supply power to the load through the first channel; if not, the load is judged to be in a standby working state, and the second channel is controlled to be conducted, so that the power module supplies power to the load through the second channel.
Preferably, the judging module includes:
a reference voltage module for outputting the reference voltage;
the comparator is used for controlling the first channel to be conducted when the voltage of the second input end is smaller than the reference voltage, so that the power supply module supplies power to the load through the first channel; and when the voltage of the second input end is not less than the reference voltage, controlling the second channel to be conducted so that the power module supplies power to the load through the second channel.
Preferably, the reference voltage module comprises a first resistor and a second resistor;
the first end of the first resistor is connected with the first end of the sampling resistor, the second end of the first resistor is respectively connected with the first end of the second resistor and the first input end of the comparator, and the second end of the second resistor is grounded.
Preferably, the first channel comprises a first controllable switch and the second channel comprises a second controllable switch;
the first end of the first controllable switch is connected with the first end of the second controllable switch and the output end of the power module respectively, the second end of the second controllable switch is connected with the second end of the second controllable switch and the power supply end of the load respectively, and the control end of the first controllable switch is connected with the control end of the second controllable switch and the output end of the control module respectively.
Preferably, the first channel further comprises a first diode, and the second channel further comprises a second diode;
the anode of the first diode is connected with the anode of the second diode and the output end of the power supply module respectively, the cathode of the first diode is connected with the first end of the first controllable switch, and the cathode of the second diode is connected with the first end of the second diode.
Preferably, the method further comprises the following steps:
and one end of the third resistor is connected with the first end of the first controllable switch, and the other end of the third resistor is connected with the control end of the first controllable switch.
Preferably, the method further comprises the following steps:
and the direct current/direct current (DC/DC) conversion module is used for converting the output voltage of the power supply module to supply power to the load, and one end of the direct current/direct current (DC/DC) conversion module is respectively connected with the output end of the first channel and the output end of the second channel, and the other end of the direct current/DC conversion module is connected with the power supply end of the load.
Preferably, the method further comprises the following steps:
and the energy storage module is used for supplying power to the load when the first channel and the second channel are switched.
The invention provides a power supply circuit which comprises a control module, a first channel, a second channel, a first filter capacitor and a second filter capacitor, wherein when a load is in a normal working state, a power module supplies power to the load through the first channel, when the load is in a standby working state, the power module supplies power to the load through the second channel, and because the capacity of the second filter capacitor is smaller than that of the first filter capacitor, after the power module is controlled to be closed in the standby working state, the time for supplying power to the load by the second filter capacitor can be reduced, namely, the power-down duration of the load in the standby working state can be reduced, so that the condition that the load operation fails due to overlong power-down duration of the load in the standby working state is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art power supply circuit;
FIG. 2 is a schematic diagram of another prior art power supply circuit;
FIG. 3 is a block diagram of a power supply circuit according to the present invention;
FIG. 4 is a schematic circuit diagram of a power supply circuit according to the present invention;
fig. 5 is a circuit diagram of another power supply circuit provided by the present invention.
Detailed Description
The core of the invention is to provide a power supply circuit, which can reduce the time for the second filter capacitor to supply power to the load after controlling the power supply module to be closed in a standby working state, namely, can reduce the power-down duration of the load in the standby working state, so as to avoid the condition of load operation failure caused by overlong power-down duration of the load in the standby state.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, fig. 3 is a block diagram of a power supply circuit according to the present invention, which includes a control module 1, a first channel 2, a second channel 3, a first filter capacitor C1, and a second filter capacitor C2 with a capacity smaller than that of the first filter capacitor C1;
the control module 1 is used for controlling the conduction of the first channel 2 when the load is in a normal working state, so that the power supply module supplies power to the load through the first channel 2; when the load is in a standby working state, controlling the second channel 3 to be conducted so that the power module supplies power to the load through the second channel 3;
the first filter capacitor C1 is used for filtering noise waves in a power supply output by the power supply module when the power supply module is started, and supplying power to a load through the first channel 2 when the power supply module is closed in a normal working state;
the second filter capacitor C2 is used for filtering noise waves in the power supply output by the power supply module when the power supply module is turned on, and supplies power to the load through the second channel 3 when the power supply module is turned off in a standby working state.
In consideration of the fact that the capacitor in the power supply circuit in the prior art has the main function of filtering noise in the power supply output by the power supply module when the load normally works, the capacity of the capacitor needs to meet the requirement of enabling the load to normally work, and the capacity of the capacitor is relatively large. If the load is in the standby state, the capacitor may maintain the load in the standby state for a long time after the power module is turned off, and if the power module is turned on again to operate the load, the operation may fail.
In order to solve the technical problem, the design idea of the application is as follows: considering that the filtering degrees required by the load in the normal operating state and the standby operating state are different, if the capacity of the capacitor is directly reduced to reduce the power-down duration of the load after the power module is turned off, insufficient filtering may be caused, so that the operation of the load is unstable.
Based on this, the present application provides two channels and two filter capacitors, namely, a first channel 2 and a second channel 3, a first filter capacitor C1 and a second filter capacitor C2, and a control module 1. The capacity of the first filter capacitor C1 is greater than that of the second filter capacitor C2, when the load is in a normal working state, the power module supplies power to the load through the first channel 2, and at the moment, the first filter capacitor C1 filters power output by the power module so as to enable the load to work normally; when the load is in a standby working state, the power module supplies power to the load through the second channel 3, at the moment, the second filter capacitor C2 filters the power output by the power module, so that the load normally works, and when the power module needs to be turned off in the standby state, the energy stored in the second filter capacitor C2 is less, so that the time for keeping the load in the standby state is shorter, and the power module is conveniently turned on next time to restart or perform other operations on the load.
It should be noted that, on the premise that the capacity of the second filter capacitor C2 is sufficient to make the load stably operate, that is, the load is not affected by noise of the power supply output by the power supply module, the capacity of the second filter capacitor C2 should be made as small as possible to reduce the power-down duration of the load after the power supply module is turned off in the standby operating state, and avoid the situation that the load fails to operate due to the overlong power-down duration of the load in the standby state.
In the present application, the capacitance of the first filter capacitor C1 may be, but is not limited to, 10 μ F, and in this case, the capacitance of the second filter capacitor C2 may be, but is not limited to, 2.2 μ F, and may also be other values, and the present application is not limited thereto.
In addition, the load can be but not limited to be intelligent lighting product, wherein, intelligent lighting product can be but not limited to including module and lamps and lanterns, specifically, power module is the module power supply through first passageway and second passageway respectively under normal operating condition and standby operating condition, equally, when closing power module under normal operating condition, first filter capacitor C1 is the module power supply, when closing power module under standby operating condition, second filter capacitor C2 is the module power supply, that is, at this moment, the load in this application is the module in the intelligent lighting product, lamps and lanterns then adopt extra power module to supply power for self. The control module 1 in the present application may be a processor or other circuits, and the present application is not limited thereto as long as the functions of the control module 1 can be achieved.
In summary, after the power supply circuit controls the power module to be turned off in the standby operating state, the time for the second filter capacitor C2 to supply power to the load may be reduced, that is, the power-down duration of the load in the standby operating state may be reduced, so as to avoid the situation that the load operation fails due to the overlong power-down duration of the load in the standby operating state.
On the basis of the above-described embodiment:
as a preferred embodiment, the control module 1 comprises:
the sampling module is used for collecting the working current of a load;
the judging module is used for judging the working state of the load according to the working current and controlling the conduction of the first channel 2 when the load is in a normal working state so as to enable the power supply module to supply power to the load through the first channel 2; and when the load is in a standby working state, controlling the second channel 3 to be conducted so that the power module supplies power to the load through the second channel 3.
This embodiment aims at providing a control module 1's concrete implementation, specifically, control module 1 in this application includes sampling module and judgement module, and the operating condition of load is judged through the operating current of the load that sampling module gathered, and then the different passageways of control switch on. The working current of the load in the normal working state is greater than that in the standby working state, so that the working state of the load can be judged by collecting the working current of the load.
The specific implementation manners of the sampling module and the determining module in the present application are not limited herein. Of course, the manner of determining the operating state of the load according to the present application may be, but is not limited to, passing the operating current, and may also be other manners, and the present application is not specifically limited herein.
It can be seen that the specific implementation manner of the control module 1 can implement the functions of the control module 1, and the implementation manner is simple and reliable.
Referring to fig. 4, fig. 4 is a circuit schematic diagram of a power supply circuit according to the present invention.
As a preferred embodiment, the sampling module includes a sampling resistor, wherein a first end of the sampling resistor is connected to the output end of the first channel 2 and the output end of the second channel 3, and a second end of the sampling resistor is connected to the power supply end of the load and the input end of the judging module respectively;
the judging module is specifically used for judging whether the voltage of the input end of the judging module is smaller than the reference voltage, if so, the load is judged to be in a normal working state, and the first channel 2 is controlled to be conducted, so that the power supply module supplies power to the load through the first channel 2; if not, the load is judged to be in a standby working state, and the second channel 3 is controlled to be conducted, so that the power module supplies power to the load through the second channel 3.
The embodiment aims to provide a specific implementation manner of a sampling module, specifically, the sampling module in the present application is a sampling resistor, the sampling resistor converts the collected current on the power supply path of the power supply module for the load, that is, the working current, into a voltage value, and then the judging module judges the size of the voltage value and the reference voltage, determines the working state of the load, and controls the corresponding channel to be switched on according to the working state of the load.
Specifically, assuming that the resistance value of the sampling resistor is R, the voltage of the first end of the sampling resistor is V1, the reference voltage is V2, the working current in the normal working state is I1, and the working current in the standby working state is I2, then V3= V1-I1R at the second end (the input end of the determination module) of the sampling resistor in the normal working state, V4= V1-I2R in the standby working state, and V4> V2> V3 is satisfied, that is, in the normal working state, the power module supplies power to the load through the first channel 2, and in the standby working state, the power module supplies power to the load through the second channel 3.
In summary, the embodiment can realize the function of the control module 1, and when the sampling module is a resistor, the implementation manner is simple and reliable, and the cost is low.
As a preferred embodiment, the judging module includes:
a reference voltage module for outputting a reference voltage;
the comparator is used for controlling the conduction of the first channel 2 when the voltage of the second input end is less than the reference voltage so that the power supply module supplies power to the load through the first channel 2; and when the voltage of the second input end is not less than the reference voltage, controlling the second channel 3 to be conducted so that the power module supplies power to the load through the second channel 3.
In consideration of the fact that the judging module in the application compares the voltage of the second end of the sampling resistor with the reference voltage, the judging module in the application comprises a reference voltage module and a comparator, the comparator judges the working current of the load at the moment through the reference voltage output by the reference voltage module and the voltage of the second end of the sampling resistor, namely, the working state of the load can be judged, and therefore the corresponding channel is controlled to be conducted, so that after the load controls the power supply module to be switched off in the standby working state, the time for supplying power to the load by the second filter capacitor C2 can be shortened, namely, the power-down duration of the load in the standby working state can be shortened, and the condition that the load operation fails due to overlong power-down duration of the load in the standby state is avoided.
The specific implementation manner of the reference voltage module and the specific type of the comparator are not specifically limited in this application.
As a preferred embodiment, the reference voltage module includes a first resistor and a second resistor;
the first end of the first resistor is connected with the first end of the sampling resistor, the second end of the first resistor is respectively connected with the first end of the second resistor and the first input end of the comparator, and the second end of the second resistor is grounded.
The embodiment aims to provide a specific implementation manner of a reference voltage module, specifically, the reference voltage module includes two voltage-dividing resistors, and a reference voltage output by the reference voltage module in the application is a voltage of a first end of a second resistor, that is, a voltage-dividing value of the second resistor.
Specifically, the resistance of the sampling resistor should be relatively smaller than the first resistor and the second resistor, so as to reduce the power consumption of the sampling resistor. In addition, the values of the first resistor, the second resistor and the sampling resistor in the present application only need to satisfy V4> V2> V3 in the above embodiment.
Therefore, the first resistor and the second resistor in the application can realize the function of outputting the reference voltage, and the realization mode is simple and reliable.
As a preferred embodiment, the first channel 2 comprises a first controllable switch, and the second channel 3 comprises a second controllable switch;
the first end of the first controllable switch is connected with the first end of the second controllable switch and the output end of the power module respectively, the second end of the second controllable switch is connected with the second end of the second controllable switch and the power supply end of the load respectively, and the control end of the first controllable switch is connected with the control end of the second controllable switch and the output end of the control module 1 respectively.
The embodiment aims to provide a specific implementation manner of the first channel 2 and the second channel 3, wherein when the load is in a normal working state, the power module supplies power to the load through the first controllable switch, and when the load is in a standby working state, the power module supplies power to the load through the second controllable switch.
Specifically, the first controllable switch in the present application may be, but is not limited to, an NMOS (Negative channel Metal Oxide Semiconductor field effect transistor), where a gate of the NMOS is a control end of the first controllable switch, a source of the NMOS is a first end of the second controllable switch, and a drain of the NMOS is a second end of the second controllable switch; the second controllable switch in the present application may be, but is not limited to, a PMOS (positive channel Metal Oxide Semiconductor field effect transistor), wherein a gate of the PMOS is a control end of the second controllable switch, a source of the PMOS is a first end of the second controllable switch, and a drain of the PMOS is a second end of the second controllable switch.
Specifically, on the basis of the above embodiment, in a normal operating state, V2> V3, the comparator outputs a high-level control signal, the first controllable switch remains on, the second controllable switch remains off, and the power module supplies power to the load through the first channel 2; in a standby working state, V4 is greater than V2, the comparator outputs a low level control signal, the first controllable switch is kept closed, the second controllable switch is kept conducted, and the power supply module supplies power to the load through the second channel 3
It can be seen that the first controllable switch and the second controllable switch in the present application may implement the functions of the first channel 2 and the second channel 3, and may also be implemented in other specific ways, and the present application is not limited herein.
Referring to fig. 5, fig. 5 is a circuit schematic diagram of another power supply circuit provided by the present invention.
As a preferred embodiment, the first channel 2 further comprises a first diode, and the second channel 3 further comprises a second diode;
the anode of the first diode is connected with the anode of the second diode and the output end of the power module respectively, the cathode of the first diode is connected with the first end of the first controllable switch, and the cathode of the second diode is connected with the first end of the second diode.
Consider after power module closes, all can store the electric capacity in first filter capacitor C1 and the second filter capacitor C2, may discharge to the load, for preventing the electric quantity of storing in the electric capacity from flowing backward to power module, so that power module damages, this application utilizes the one-way electric conductivity of diode, all set up between power module and first controllable switch and power module and second controllable switch and prevented flowing backward the diode, prevent respectively that the electric quantity of storing in first filter capacitor C1 and the second filter capacitor C2 from flowing backward to power module, prevent that power module from being damaged.
Of course, other anti-backflow devices may be provided, and the device is not limited to a diode, and the application is not limited thereto.
As a preferred embodiment, the method further comprises the following steps:
and one end of the third resistor is connected with the first end of the first controllable switch, and the other end of the third resistor is connected with the control end of the first controllable switch.
In order to ensure that the first controllable switch can be reliably turned on or off, the third resistor is arranged between the first end and the control end of the first controllable switch, and when the first controllable switch is a field effect transistor, the bias voltage is provided for the field effect transistor. In addition, the resistance value between the grid and the source of the field effect transistor is very large, so that very high voltage can be generated at two ends of the equivalent capacitor between the grid and the source as long as a small amount of static electricity exists, if the small amount of static electricity is not discharged in time, the high voltage at two ends of the grid and the source can cause the field effect transistor to generate misoperation, even can break down the grid source, and at the moment, the third resistor between the grid and the source can discharge the static electricity, so that the effect of protecting the field effect transistor is achieved, and the reliability of the power supply resistor is improved.
As a preferred embodiment, the method further comprises the following steps:
and a DC/DC (DC-DC converter) conversion module, one end of which is connected to the output end of the first channel 2 and the output end of the second channel 3, respectively, and the other end of which is connected to the power supply end of the load, for converting the output voltage of the power supply module to supply power to the load.
Considering that the voltage output by the power module may not be the voltage required by the load, a DC/DC conversion module is further disposed between the power module and the power supply terminal of the load for converting the power voltage output by the power module to supply power to the load so as to meet the operation requirement of the load.
As a preferred embodiment, the method further comprises the following steps:
and the energy storage module is connected with the output end of the first channel 2 and the output end of the second channel 3 at one end respectively, and the other end of the energy storage module is grounded and used for supplying power to a load when the first channel 2 and the second channel 3 are switched.
Considering that the load is switched between the normal operating state and the standby operating state, that is, when the power module is switched between the first channel 2 and the second channel 3, there may be a situation that the power module cannot supply power to the load at the back end during the switching, and at this time, some data in the load may not be stored in time, or may work abnormally.
In order to solve the technical problem, the energy storage module is further arranged, when the channel is switched, power is supplied to the load, the load is prevented from being powered off, and the situation that data possibly cannot be stored in time or work is abnormal is avoided.
The energy storage module in the present application may be, but is not limited to, a capacitor, and in addition, the capacity of the capacitor in the present application should be as small as possible, so as to prevent a situation that power failure of a load is caused by power supply to the load through the capacitor after the power module is turned off, and the capacity of the energy storage capacitor may be, but is not limited to, 2.2 μ F.
In summary, the energy storage module can ensure that the load at the rear end is supplied with electric power when the first channel 2 and the second channel 3 are switched.
It should be noted that, in the present specification, relational terms such as first and second, and the like are used only for distinguishing one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A power supply circuit is characterized by comprising a control module, a first channel, a second channel, a first filter capacitor and a second filter capacitor, wherein the capacity of the second filter capacitor is smaller than that of the first filter capacitor;
the control module is used for controlling the first channel to be conducted when the load is in a normal working state so as to enable the power supply module to supply power to the load through the first channel; when the load is in a standby working state, controlling the second channel to be conducted so that the power module supplies power to the load through the second channel;
the first filter capacitor is used for filtering noise waves in a power supply output by the power supply module when the power supply module is started, and supplying power to the load through the first channel when the power supply module is closed in a normal working state;
the second filter capacitor is used for filtering noise waves in a power supply output by the power supply module when the power supply module is started, and supplying power to the load through the second channel when the power supply module is closed in a standby working state;
the control module includes:
the sampling module is used for collecting the working current of the load;
the judging module is used for judging the working state of the load according to the working current and controlling the conduction of the first channel when the load is in a normal working state so as to enable the power supply module to supply power to the load through the first channel; and when the load is in a standby working state, controlling the second channel to be conducted so that the power module supplies power to the load through the second channel.
2. The power supply circuit according to claim 1, wherein the sampling module comprises a sampling resistor, wherein a first end of the sampling resistor is connected to the output end of the first channel and the output end of the second channel, and a second end of the sampling resistor is connected to the power supply end of the load and the input end of the judging module respectively;
the judging module is specifically used for judging whether the voltage of the input end of the judging module is smaller than the reference voltage, if so, judging that the load is in a normal working state, and controlling the first channel to be conducted so as to enable the power supply module to supply power to the load through the first channel; if not, the load is judged to be in a standby working state, and the second channel is controlled to be conducted, so that the power module supplies power to the load through the second channel.
3. The power supply circuit of claim 2, wherein the determining module comprises:
a reference voltage module for outputting the reference voltage;
the comparator is used for controlling the first channel to be conducted when the voltage of the second input end is smaller than the reference voltage, so that the power supply module supplies power to the load through the first channel; and when the voltage of the second input end is not less than the reference voltage, controlling the second channel to be conducted so that the power module supplies power to the load through the second channel.
4. The power supply circuit of claim 3 wherein said reference voltage module comprises a first resistor and a second resistor;
the first end of the first resistor is connected with the first end of the sampling resistor, the second end of the first resistor is respectively connected with the first end of the second resistor and the first input end of the comparator, and the second end of the second resistor is grounded.
5. The power supply circuit of claim 1 wherein said first channel comprises a first controllable switch and said second channel comprises a second controllable switch;
the first end of the first controllable switch is connected with the first end of the second controllable switch and the output end of the power module respectively, the second end of the second controllable switch is connected with the second end of the second controllable switch and the power supply end of the load respectively, and the control end of the first controllable switch is connected with the control end of the second controllable switch and the output end of the control module respectively.
6. The power supply circuit of claim 5 wherein the first channel further comprises a first diode, the second channel further comprises a second diode;
the anode of the first diode is connected with the anode of the second diode and the output end of the power module respectively, the cathode of the first diode is connected with the first end of the first controllable switch, and the cathode of the second diode is connected with the first end of the second diode.
7. The power supply circuit of claim 5, further comprising:
and one end of the third resistor is connected with the first end of the first controllable switch, and the other end of the third resistor is connected with the control end of the first controllable switch.
8. The power supply circuit of claim 1, further comprising:
and the direct current/direct current DC/DC conversion module is used for converting the output voltage of the power supply module to supply power to the load, and one end of the direct current/direct current DC/DC conversion module is respectively connected with the output end of the first channel and the output end of the second channel, and the other end of the direct current/direct current DC/DC conversion module is connected with the power supply end of the load.
9. The power supply circuit of any one of claims 1-8, further comprising:
and the energy storage module is used for supplying power to the load when the first channel and the second channel are switched.
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| CN112039313A (en) * | 2020-07-28 | 2020-12-04 | 漳州科华技术有限责任公司 | Auxiliary power supply device, control method of auxiliary power supply device, and converter |
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| CN101442215A (en) * | 2008-09-04 | 2009-05-27 | 华为技术有限公司 | Power feeding device, power supply method using the device and electronic equipment |
| CN201352759Y (en) * | 2008-12-17 | 2009-11-25 | 国琏电子（上海）有限公司 | Power source device with low standby power |
| CN102244470A (en) * | 2010-05-11 | 2011-11-16 | 联昌电子企业股份有限公司 | Supply apparatus and power supply method |
| CN205429722U (en) * | 2015-12-02 | 2016-08-03 | 浙江绿动电机科技有限公司 | Electric tool and power -off protection system thereof |
| CN207504765U (en) * | 2017-09-27 | 2018-06-15 | Tcl通力电子（惠州）有限公司 | Power supply circuit and audio frequency apparatus |
| CN110098604B (en) * | 2019-05-08 | 2021-06-29 | 上海松下微波炉有限公司 | Discharge circuit, power filter circuit, power supply circuit and household appliance |
| CN212935568U (en) * | 2020-07-14 | 2021-04-09 | 林恩来 | Intelligent auxiliary switch |
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| CN112039313A (en) * | 2020-07-28 | 2020-12-04 | 漳州科华技术有限责任公司 | Auxiliary power supply device, control method of auxiliary power supply device, and converter |
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