CN115395769A - Protection regulating circuit - Google Patents
Protection regulating circuit Download PDFInfo
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- CN115395769A CN115395769A CN202211306382.1A CN202211306382A CN115395769A CN 115395769 A CN115395769 A CN 115395769A CN 202211306382 A CN202211306382 A CN 202211306382A CN 115395769 A CN115395769 A CN 115395769A
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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
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application provides a protection regulating circuit, wherein, circuit structure in this application is a closed-loop control circuit, behind the sampling current that is used for expressing the operating current of load that the current regulation unit obtained, when determining that sampling current is higher than the rated value, to the regulation signal of telecommunication of the operating current that power drive circuit output is used for reducing the load, thereby make power drive circuit reduce the electric energy to load circuit output, and then reduce the electric current of load of flowing through, avoid the long-time work of load under the environment that overflows, thereby be favorable to reducing the probability that electrical apparatus damaged.
Description
Technical Field
The application relates to the technical field of circuit protection, in particular to a protection regulating circuit.
Background
The power supply in the application circuit outputs constant power usually, the load can ask for power from the power supply according to the power required by the load, and the maximum working power of the load in the common design can be smaller than the configured power supply power. The load often varies with the use conditions of the user. Most of the changes in normal operating conditions are within the consideration of the designer, but the sudden changes in the use environment or incorrect operation by the user may cause the load to change beyond the design specifications, so that the load may generate a current demand exceeding the rated current demand, and the output capacity of the configured power supply may be exceeded, thereby damaging the power supply or the load equipment.
Disclosure of Invention
In view of this, the present application provides a protection adjustment circuit to reduce the probability of damage to an electrical appliance.
The embodiment of the application provides a protection regulating circuit, the circuit includes:
the power supply circuit, the current regulation unit, the power driving circuit, the load circuit and the load working current feedback circuit;
the power supply circuit is used for converting mains supply into direct-current voltages with various set amplitudes, and comprises a plurality of direct-current voltage output ends, the power supply circuit respectively supplies power to the current regulating unit, the electronic device in the power driving circuit and the electronic device in the load working current feedback circuit through the direct-current voltage output ends, wherein for each direct-current voltage output end, the voltage output by the direct-current voltage output end is matched with the working voltage of the electronic device connected with the direct-current voltage output end;
the power driving circuit is used for outputting electric energy to the load circuit, and the magnitude of the current corresponding to the electric energy output by the power driving circuit is obtained after the current output by the power circuit is regulated by the power driving circuit;
the load circuit is used for executing corresponding functions by a load in the load circuit under the action of the current input by the power driving circuit;
the load working current feedback circuit is used for sampling the working current of the load in the load circuit to obtain a sampling current for representing the working current of the load in the load circuit;
and the current regulating unit is used for outputting a regulating electric signal for reducing the working current of the load to the power driving circuit when the sampling current is higher than a rated value, wherein the rated value is the maximum working current of the load.
Optionally, the current regulation unit is a single chip microcomputer, a power input end of the single chip microcomputer is electrically connected with a first direct-current voltage output end of the direct-current voltage output end, a voltage output by the first direct-current voltage output end is matched with a working voltage of the single chip microcomputer, a PWM signal output pin of the single chip microcomputer is electrically connected with the power driving circuit, an ADC pin of the single chip microcomputer is electrically connected with the load working current feedback circuit, and a grounding pin of the single chip microcomputer is grounded.
Optionally, the power driving circuit comprises: the current limiting resistor, the N-type triode, the pull-up resistor, the first capacitor, the field effect transistor driving circuit and the field effect transistor;
the base electrode of the N-type triode is electrically connected with a PWM signal output pin of the singlechip through the current limiting resistor, the current limiting resistor is used for limiting the current of the adjusting electric signal within the working current range of the base electrode, the collector electrode of the N-type triode is electrically connected with a second direct current voltage output end in the direct current voltage output ends through the pull-up resistor, and the emitter electrode of the N-type triode is grounded;
the field-effect tube driving circuit comprises a field-effect tube driving circuit, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a power input end, a power output end, a driving signal output end, a power input end and a power output end, wherein the driving signal input end of the field-effect tube driving circuit is electrically connected with the collector electrode, the enable end of the field-effect tube driving circuit is grounded, the third direct-current voltage output end of the direct-current voltage output end is grounded through the first capacitor, the first capacitor is used for stabilizing the working voltage of the field-effect tube driving circuit, the power input end of the field-effect tube driving circuit is electrically connected with the fourth direct-current voltage output end of the direct-current voltage output end, the driving signal output end of the field-effect tube driving circuit is electrically connected with the driving signal input end of the field-effect tube, the power input end of the field-effect tube is electrically connected with the fourth direct-current voltage output end, and the output end of the field-effect tube is used for outputting electric energy to the load circuit;
the pull-up resistor is used for enabling the field effect transistor driving circuit to obtain preset voltage rise time and limiting the magnitude of current output by the second direct-current voltage output end;
the voltage output by the third direct-current voltage output end is matched with the working voltage of the field-effect tube driving circuit;
and the voltage output by the fourth direct-current voltage output end is matched with the working voltage of the field-effect tube driving circuit, and the working voltage of the field-effect tube driving circuit is matched with the working voltage of the field-effect tube.
Optionally, the load circuit includes a second capacitor and the load, the second capacitor and the load are in a parallel structure, an input end of the load is electrically connected to an output end of the field-effect transistor, and an output end of the load is used for outputting the working current to the load working current feedback circuit.
Optionally, the load operation current feedback circuit includes: the circuit comprises a power sampling resistor, a third capacitor, a voltage follower amplifier, a first follower amplifier matching resistor, a second follower amplifier matching resistor, a first voltage division protection circuit matching resistor, a second voltage division protection circuit matching resistor and a fourth capacitor;
a signal input end of the voltage follower amplifier is electrically connected with an output end of the load, a signal input end of the voltage follower amplifier is grounded through the power sampling resistor, a power input end of the voltage follower amplifier is electrically connected with a fourth direct-current voltage output end, a power input end of the voltage follower amplifier is grounded through the third capacitor, a signal output end of the voltage follower amplifier is electrically connected with a first end of the first follower amplifier matching resistor, an amplification proportion adjusting end of the voltage follower amplifier is electrically connected with a second end of the first follower amplifier matching resistor, a first end of the second follower amplifier matching resistor is electrically connected with a second end of the first follower amplifier matching resistor, a first end of the first divider protection circuit matching resistor is electrically connected with a first end of the first follower amplifier matching resistor, a second end of the first divider protection circuit matching resistor is electrically connected with a first end of the second divider protection circuit matching resistor, a second end of the second divider protection circuit matching resistor and a second end of the second follower amplifier matching resistor are both grounded, a first end of the fourth capacitor is electrically connected with a first end of the first divider protection circuit matching resistor, a second end of the fourth capacitor is grounded, and a second end of the fourth capacitor is grounded; and the first end of the fourth capacitor is electrically connected with an ADC pin of the singlechip.
Optionally, the power sampling resistor is a resistor with a tolerance power higher than a preset power, an overcurrent capacity higher than a preset current, and a resistance precision of more than one percent.
Optionally, the power sampling resistor is a cement resistor.
Optionally, the circuit is applied in a household appliance capable of regulating power.
Optionally, the circuit is applied to a humidifying appliance, a heating appliance, a refrigerating appliance, a blowing appliance and a lighting appliance.
Optionally, the circuit is applied in a humidifier.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the circuit structure in this application is a closed-loop control circuit, behind the sampling current that is used for expressing the operating current of load that the current regulation unit obtained, when determining that sampling current is higher than the rated value, to the regulation signal of telecommunication of the operating current that power drive circuit output is used for reducing the load, thereby make power drive circuit reduce the electric energy to load circuit output, and then reduce the electric current of load of flowing through, avoid the long-time work of load under the environment that overflows, thereby be favorable to reducing the probability that electrical apparatus damaged.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a protection regulating circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another protection adjustment circuit provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of another protection adjustment circuit provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of another protection adjustment circuit provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of another protection adjustment circuit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted in advance that, taking the humidifier as an example, the conventional humidifier device has various types of atomization manners, including but not limited to common humidifier devices such as an ultrasonic type, a boiling evaporation type, an active airflow evaporation type, and the like, taking the ultrasonic type humidifier as an example, a portion emitting ultrasonic waves is a load portion of the humidifier, and regarding a specific load, it needs to be determined according to an actual electrical appliance, and details are not repeated here.
It should be noted that, in the following fig. 1-5, the solid black dot at the intersection of the two lines for representing the electrical connection represents that the two lines are connected, and the intersection without the solid black dot represents that the two lines are not connected.
The following is a detailed description of the present application.
Fig. 1 is a schematic structural diagram of a protection regulating circuit according to an embodiment of the present application, and as shown in fig. 1, the protection regulating circuit includes: a power supply circuit 101, a current regulation unit 102, a power driving circuit 103, a load circuit 104, and a load working current feedback circuit 105;
the power circuit 101 is configured to convert a commercial power into a plurality of dc voltages with set amplitudes, where the power circuit 101 includes a plurality of dc voltage output ends, and the power circuit 101 supplies power to the current adjusting unit 102, the electronic devices in the power driving circuit 103, and the electronic devices in the load working current feedback circuit 105 through the dc voltage output ends, respectively, where, for each dc voltage output end, a voltage output by the dc voltage output end is adapted to a working voltage of the electronic device connected to the dc voltage output end;
the power driving circuit 103 is configured to output electric energy to the load circuit 104, and the magnitude of the current corresponding to the electric energy output by the power driving circuit 103 is obtained after the current output by the power circuit 101 is adjusted by the power driving circuit 103;
the load circuit 104 is configured to perform a corresponding function by a load (not shown in fig. 1) in the load circuit 104 under the action of the current input by the power driving circuit 103;
the load working current feedback circuit 105 is configured to sample a working current of a load in the load circuit 104 to obtain a sampled current representing the working current of the load in the load circuit 104;
the current adjusting unit 102 is configured to output, to the power driving circuit 103, an adjusting electrical signal for reducing an operating current of the load when the sampling current is higher than a rated value, where the rated value is a maximum operating current of the load.
Specifically, the power circuit 101 includes a commercial power conversion circuit, which can convert a commercial power into a dc voltage with a set amplitude, and the power circuit 101 includes a plurality of dc voltage output terminals, and different dc voltage output terminals can output different dc voltages for different electronic devices to use, so that the electronic devices operate under an operating voltage, as shown in fig. 1, the power circuit 101 may supply power to the current adjusting unit 102, the electronic devices in the power driving circuit 103, and the electronic devices in the load operating current feedback circuit 105, where the power driving circuit 103 is configured to convert input electric energy, and convert the electric energy into electric energy required by the load in the load circuit 104 when operating, such as: the current corresponding to the electric energy is converted into the current required by the load during working, namely: the power driving circuit 103 can adjust the magnitude of the output current, the load in the load circuit 104 works under the current output by the power driving circuit 103, so as to perform a corresponding function, taking an ultrasonic humidifier as an example, a part emitting ultrasonic waves is a load part of the humidifier, the load can atomize water into steam when in work, in order to obtain a current working current for representing the load, a load working current feedback circuit 105 is further arranged in fig. 1, the load working current feedback circuit collects a sampling current for representing the working current of the load in the load circuit 104, the current working current of the load can be determined through the sampling current, the current adjusting unit 102 compares the sampling currents, when the sampling current is higher than a rated value, the current working current of the load is higher than a maximum working current allowed by the load, so as to avoid the problem that the load works in an overcurrent state for a long time, so as to cause damage to the electrical appliance, when the sampling current is higher than the rated value, the current adjusting unit 102 outputs an adjusting electrical signal for reducing the working current of the load to the power driving circuit 103, so that the electrical appliance outputs a current to the load circuit 104 under the effect of the adjusting electrical signal, so as to reduce the current of the load, thereby being beneficial to reduce the probability of the load in the load environment of the load, so as to reduce the current of the load, thereby, and further reduce the probability of the load, thereby being beneficial to reduce the load in the environment of the load.
It should be noted that, the specific types of the power supply circuit 101, the current regulation unit 102, the power driving circuit 103, the load circuit 104, and the load working current feedback circuit 105 related to fig. 1 may be set according to actual needs, and are not described in detail herein, and it should be noted that the voltage output by the dc voltage output terminal included in the power supply circuit 101 needs to be adapted to the working voltage required by the electronic device used.
In a feasible implementation, fig. 2 is a schematic structural diagram of another protection and adjustment circuit provided in the embodiment of the present application, as shown in fig. 2, the current adjustment unit 102 is a single chip microcomputer 1021, a power input end of the single chip microcomputer 1021 is electrically connected to a first dc voltage output end of the dc voltage output end, a voltage output by the first dc voltage output end is adapted to a working voltage of the single chip microcomputer 1021, a PWM (Pulse Width Modulation) signal output pin of the single chip microcomputer 1021 is electrically connected to the power driving circuit 103, an ADC (Analog-to-digital converter) pin of the single chip microcomputer 1021 (a sampling input pin of the single chip microcomputer 1021) is electrically connected to the load working current feedback circuit 105, and a ground pin of the single chip microcomputer 1021 is grounded.
It should be noted that the specific type of the single chip microcomputer 1021 can be set according to actual needs, and is not specifically limited herein.
In a possible implementation, fig. 3 is a schematic structural diagram of another protection and regulation circuit provided in an embodiment of the present application, and as shown in fig. 3, the power driving circuit 103 includes: a current limiting resistor 1031, an N-type triode 1032, a pull-up resistor 1033, a first capacitor 1034, a field effect tube driving circuit 1035 and a field effect tube 1036;
a base electrode of the N-type triode 1032 is electrically connected with a PWM signal output pin of the singlechip 1021 through the current limiting resistor 1031, the current limiting resistor 1031 is used for limiting the current of the adjusting electric signal within the working current range of the base electrode, a collector electrode of the N-type triode 1032 is electrically connected with a second direct current voltage output end of the direct current voltage output ends through the pull-up resistor 1033, and an emitter electrode of the N-type triode 1032 is grounded;
a driving signal input end of the fet driving circuit 1035 is electrically connected to the collector electrode, an enable end of the fet driving circuit 1035 is grounded, a third dc voltage output end of the dc voltage output ends is grounded through the first capacitor 1034, the first capacitor 1034 is configured to stabilize a working voltage of the fet driving circuit, a power supply input end of the fet driving circuit 1035 is electrically connected to a fourth dc voltage output end of the dc voltage output ends, a driving signal output end of the fet driving circuit 1035 is electrically connected to a driving signal input end of the fet 1036, a power supply input end of the fet 1036 is electrically connected to the fourth dc voltage output end, and an output end of the fet 1036 is configured to output electric energy to the load circuit 104;
the pull-up resistor 1033 is used for enabling the fet driving circuit 1035 to obtain a preset voltage rise time, and for limiting the magnitude of the current output from the second dc voltage output terminal;
the voltage output by the third dc voltage output terminal is adapted to the working voltage of the fet drive circuit 1035;
the voltage output from the fourth dc voltage output terminal is adapted to the operating voltage of the fet drive circuit 1035, and the operating voltage of the fet drive circuit 1035 is adapted to the operating voltage of the fet 1036.
Specifically, as shown in fig. 3, the current limiting resistor 1031 is used to limit the base current flowing through the N-type transistor 1032, because the voltage required by the fet driving circuit 1035 is higher, the N-type transistor 1032 is used to drive the fet driving circuit 1035 to operate, the pull-up resistor 1033 is used to increase the driving voltage provided to the fet driving circuit 1035, the first capacitor 1034 is used to absorb low-frequency interference and stabilize the output voltage of the fet driving circuit 1035, the fet driving circuit 1035 is used to drive the fet 1036, and the fet 1036 is used to control the current output from the power circuit 101 to the load circuit 104.
In a possible implementation, fig. 4 is a schematic structural diagram of another protection and regulation circuit provided in this embodiment of the present application, as shown in fig. 4, the load circuit 104 includes a second capacitor 1041 and the load 1042, the second capacitor 1041 and the load 1042 are in a parallel structure, an input end of the load 1042 is electrically connected to an output end of the fet 1036, and an output end of the load 1042 is used for outputting the working current to the load working current feedback circuit 105.
Specifically, as shown in fig. 4, the second capacitor 1041 is used for absorbing the pulse current that may be generated by the load 1042.
In a possible implementation, fig. 5 is a schematic structural diagram of another protection and regulation circuit provided in an embodiment of the present application, and as shown in fig. 5, the load working current feedback circuit 105 includes: a power sampling resistor 1051, a third capacitor 1052, a voltage follower amplifier 1053, a first follower amplifier matching resistor 1054, a second follower amplifier matching resistor 1055, a first voltage division protection circuit matching resistor 1056, a second voltage division protection circuit matching resistor 1057 and a fourth capacitor 1058;
a signal input terminal of the voltage follower amplifier 1053 is electrically connected to an output terminal of the load 1042, a signal input terminal of the voltage follower amplifier 1053 is electrically connected to the ground through the power sampling resistor 1051, a power input terminal of the voltage follower amplifier 1053 is electrically connected to the fourth dc voltage output terminal, a power input terminal of the voltage follower amplifier 1053 is electrically connected to the ground through the third capacitor 1052, a signal output terminal of the voltage follower amplifier 1053 is electrically connected to a first terminal of the first follower amplifier matching resistor 1054, an amplification ratio adjustment terminal of the voltage follower amplifier 1053 is electrically connected to a second terminal of the first follower amplifier matching resistor 1054, a first terminal of the second follower amplifier matching resistor 1055 is electrically connected to a second terminal of the first follower amplifier matching resistor 1054, a first terminal of the first divider circuit matching resistor 1056 is electrically connected to a first terminal of the first follower amplifier matching resistor 1054, a second terminal of the first divider circuit matching resistor 1056 is electrically connected to a first terminal of the second divider circuit matching resistor 1057, a second terminal of the second divider circuit matching resistor 1057 and a second terminal of the second divider circuit matching resistor 1058 are electrically connected to the ground, and a second terminal of the voltage follower amplifier 1058 is electrically connected to the ground; a first end of the fourth capacitor 1058 is electrically connected to an ADC pin of the single chip 1021.
Specifically, the power sampling resistor 1051 is used for sampling the current of the load 1042 and converting the current into a weaker voltage signal to know the real-time current of the load 1042, and meanwhile, the power sampling resistor 1051 can be used for transient load short-circuit protection, the third capacitor 1052 is used for absorbing high-frequency interference, the input voltage of the voltage follower amplifier 1053 is stabilized, the voltage follower amplifier 1053 obtains the weaker current signal from the power sampling resistor 1051 and converts the weaker current signal into a voltage signal with stronger driving capability, and the voltage signal is used as first-stage isolation protection of the single chip microcomputer 1021 and the load circuit 104, the first follower matching resistor 1054 and the second follower matching resistor 1055 are both used for matching and amplifying the input voltage signal, the first divider matching resistor 1056 and the second divider matching resistor 1057 form a serial divider circuit for dividing and reducing the voltage of the voltage signal output by the voltage follower amplifier 1053 and are used as second-stage isolation protection of the single chip microcomputer 1021 and the load circuit 104, and the fourth capacitor 1058 is used for smoothing the voltage obtained by the sampling circuit, and reducing the voltage signal obtained by the single chip microcomputer 1021, wherein the sampling circuit is formed by the power sampling resistor 1051, the third follower matching resistor 1052, the first follower matching resistor 1054, the second follower matching amplifier 1055, and the second follower matching resistor 1055.
It should be noted that all grounds in the load operation current feedback circuit 105 are equipotential grounds.
The principle of operation of the circuit shown in fig. 5 is as follows:
the circuit shown in fig. 5 is powered by the power supply circuit 101, the load circuit 104 is powered by the fet 1036, the fet 1036 is indirectly controlled by the single chip 1021 via the fet drive circuit 1035, and the power supplied by the power supply circuit 101 to the load circuit 104 is controlled by the pwm output control.
The feedback loop is composed of a power sampling resistor 1051, a third capacitor 1052, a voltage follower amplifier 1053, a first follower amplifier matching resistor 1054, a second follower amplifier matching resistor 1055 and a single chip microcomputer 1021, a current signal of the load circuit 104 is sampled by the power sampling resistor 1051 and then converted into a weaker voltage signal to be input into the voltage follower amplifier 1053, the voltage follower amplifier 1053 sorts and follows and amplifies the sampled signal (when necessary), and outputs the signal to a first voltage division protection circuit matching resistor 1056 and a second voltage division protection circuit matching resistor 1057, because the working voltage of the voltage follower amplifier 1053 is usually higher than the voltage value which can be born by an ADC pin of the single chip microcomputer 1021, the voltage division protection circuit composed of the first voltage division protection circuit matching resistor 1056 and the second voltage division protection circuit matching resistor 1057 is used for voltage division modulation of the signal from the voltage follower amplifier 1053, and the voltage is smoothed and output by a fourth capacitor 1058 and then is sent into the single chip microcomputer 1021 for processing.
The single chip 1021 processes the acquired voltage signal through the feedback loop, actively intervenes through a preset program or a user, and adjusts and controls the power acquired by the load through the working loop, so as to form a closed loop.
Short-circuit protection, at the moment of short circuit of the load 1042, the fet 1036 is still in a conducting state, the short-circuit state of the load 1042 is equivalent to a conducting wire, the power circuit 101 supplies power to the power sampling resistor 1051 through the fet 1036, the power sampling resistor 1051 is a high-power cement resistor, energy which cannot be consumed by the load can be consumed at the moment of short circuit, at the next moment, a short-circuit signal fed back to the single chip 1021 by the sampling circuit triggers short-circuit protection control of the single chip 1021, the single chip 1021 controls the fet 1036 through the fet driving circuit 1035 to turn off the power driving circuit 103 in time, and power is cut off to flow through the power sampling resistor 1051, thereby achieving the short-circuit protection process of the load 1042.
In a possible embodiment, as shown in fig. 5, the power sampling resistor is a resistor which can withstand power higher than a preset power, has overcurrent capacity higher than a preset current, and has resistance accuracy of more than one percent.
In one possible embodiment, as shown in fig. 5, the power sampling resistor 1051 is a cement resistor.
In one possible embodiment, the circuit shown in fig. 5 is applied in a household appliance capable of regulating power.
In one possible embodiment, the circuit shown in fig. 5 is applied to a humidifying appliance, a heating appliance, a refrigerating appliance, a blowing appliance, a lighting appliance.
In one possible embodiment, the circuit shown in fig. 5 is applied in a humidifier.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A protection regulating circuit, characterized in that the circuit comprises:
the power supply circuit, the current regulation unit, the power driving circuit, the load circuit and the load working current feedback circuit;
the power supply circuit is used for converting commercial power into direct-current voltages with various set amplitudes, and comprises a plurality of direct-current voltage output ends, the power supply circuit supplies power to the current regulating unit, the electronic devices in the power driving circuit and the electronic devices in the load working current feedback circuit through the direct-current voltage output ends respectively, wherein for each direct-current voltage output end, the voltage output by the direct-current voltage output end is matched with the working voltage of the electronic devices connected with the direct-current voltage output end;
the power driving circuit is used for outputting electric energy to the load circuit, and the magnitude of current corresponding to the electric energy output by the power driving circuit is obtained after the current output by the power circuit is regulated by the power driving circuit;
the load circuit is used for executing corresponding functions by a load in the load circuit under the action of the current input by the power driving circuit;
the load working current feedback circuit is used for sampling the working current of the load in the load circuit to obtain a sampling current for representing the working current of the load in the load circuit;
and the current regulating unit is used for outputting a regulating electric signal for reducing the working current of the load to the power driving circuit when the sampling current is higher than a rated value, wherein the rated value is the maximum working current of the load.
2. The circuit of claim 1, wherein the current regulating unit is a single chip microcomputer, a power input terminal of the single chip microcomputer is electrically connected to a first direct-current voltage output terminal of the direct-current voltage output terminals, a voltage output by the first direct-current voltage output terminal is adapted to the operating voltage of the single chip microcomputer, a PWM signal output pin of the single chip microcomputer is electrically connected to the power driving circuit, an ADC pin of the single chip microcomputer is electrically connected to the load operating current feedback circuit, and a ground pin of the single chip microcomputer is grounded.
3. The circuit of claim 2, wherein the power driving circuit comprises: the current limiting resistor, the N-type triode, the pull-up resistor, the first capacitor, the field effect transistor driving circuit and the field effect transistor;
the base electrode of the N-type triode is electrically connected with a PWM signal output pin of the singlechip through the current limiting resistor, the current limiting resistor is used for limiting the current of the adjusting electric signal within the working current range of the base electrode, the collector electrode of the N-type triode is electrically connected with a second direct current voltage output end in the direct current voltage output ends through the pull-up resistor, and the emitter electrode of the N-type triode is grounded;
the field-effect tube driving circuit comprises a field-effect tube driving circuit, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a power input end, a power output end, a driving signal output end, a power input end and a power output end, wherein the driving signal input end of the field-effect tube driving circuit is electrically connected with the collector electrode, the enable end of the field-effect tube driving circuit is grounded, the third direct-current voltage output end of the direct-current voltage output end is grounded through the first capacitor, the first capacitor is used for stabilizing the working voltage of the field-effect tube driving circuit, the power input end of the field-effect tube driving circuit is electrically connected with the fourth direct-current voltage output end of the direct-current voltage output end, the driving signal output end of the field-effect tube driving circuit is electrically connected with the driving signal input end of the field-effect tube, the power input end of the field-effect tube is electrically connected with the fourth direct-current voltage output end, and the output end of the field-effect tube is used for outputting electric energy to the load circuit;
the pull-up resistor is used for enabling the field effect transistor driving circuit to obtain preset voltage rise time and limiting the magnitude of current output by the second direct-current voltage output end;
the voltage output by the third direct-current voltage output end is matched with the working voltage of the field effect transistor driving circuit;
and the voltage output by the fourth direct-current voltage output end is matched with the working voltage of the field-effect tube driving circuit, and the working voltage of the field-effect tube driving circuit is matched with the working voltage of the field-effect tube.
4. The circuit of claim 3, wherein the load circuit comprises a second capacitor and the load, the second capacitor and the load being in a parallel configuration, an input of the load being electrically connected to an output of the FET, an output of the load being configured to output the operating current to the load operating current feedback circuit.
5. The circuit of claim 4, wherein the load operation current feedback circuit comprises: the circuit comprises a power sampling resistor, a third capacitor, a voltage follower amplifier, a first follower amplifier matching resistor, a second follower amplifier matching resistor, a first voltage division protection circuit matching resistor, a second voltage division protection circuit matching resistor and a fourth capacitor;
a signal input end of the voltage follower amplifier is electrically connected with an output end of the load, a signal input end of the voltage follower amplifier is grounded through the power sampling resistor, a power input end of the voltage follower amplifier is electrically connected with a fourth direct-current voltage output end, a power input end of the voltage follower amplifier is grounded through the third capacitor, a signal output end of the voltage follower amplifier is electrically connected with a first end of the first follower amplifier matching resistor, an amplification proportion adjusting end of the voltage follower amplifier is electrically connected with a second end of the first follower amplifier matching resistor, a first end of the second follower amplifier matching resistor is electrically connected with a second end of the first follower amplifier matching resistor, a first end of the first divider protection circuit matching resistor is electrically connected with a first end of the first follower amplifier matching resistor, a second end of the first divider protection circuit matching resistor is electrically connected with a first end of the second divider protection circuit matching resistor, a second end of the second divider protection circuit matching resistor and a second end of the second follower amplifier matching resistor are both grounded, a first end of the fourth capacitor is electrically connected with a first end of the first divider protection circuit matching resistor, a second end of the fourth capacitor is grounded, and a second end of the fourth capacitor is grounded; and the first end of the fourth capacitor is electrically connected with an ADC pin of the singlechip.
6. The circuit of claim 5, wherein the power sampling resistor is a resistor which can withstand power higher than a preset power, has overcurrent capability higher than a preset current, and has resistance accuracy of more than one percent.
7. The circuit of claim 6, wherein the power sampling resistor is a cement resistor.
8. The circuit according to claim 1, wherein the circuit is used in a household appliance capable of regulating power.
9. The circuit of claim 1, wherein the circuit is applicable to humidifying appliances, heating appliances, refrigerating appliances, blowing appliances, lighting appliances.
10. The circuit of claim 1, wherein the circuit is used in a humidifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211306382.1A CN115395769B (en) | 2022-10-25 | 2022-10-25 | Protection regulating circuit |
| JP2022195018A JP7302084B1 (en) | 2022-10-25 | 2022-12-06 | protection regulation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211306382.1A CN115395769B (en) | 2022-10-25 | 2022-10-25 | Protection regulating circuit |
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| CN115395769A true CN115395769A (en) | 2022-11-25 |
| CN115395769B CN115395769B (en) | 2023-02-03 |
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| CN202211306382.1A Active CN115395769B (en) | 2022-10-25 | 2022-10-25 | Protection regulating circuit |
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| CN116773896B (en) * | 2023-08-23 | 2023-11-21 | 深圳市新蕾电子有限公司 | Current detection circuit |
| CN118708012A (en) * | 2024-08-27 | 2024-09-27 | 无锡市晶源微电子股份有限公司 | Transistor safe working area self-adaptive adjusting device and transistor application system |
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|---|---|---|---|---|
| CN101227778A (en) * | 2008-02-19 | 2008-07-23 | 东南大学 | Self-excited oscillation type high power LED constant-current driving circuit |
| CN102711307A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Dimmable light-emitting diode (LED) drive circuit and lamp |
| CN109032042A (en) * | 2018-09-11 | 2018-12-18 | 中国地质大学（武汉） | A kind of discharge circuit with constant pressure and flow |
| CN209994289U (en) * | 2019-05-15 | 2020-01-24 | 厦门立达信照明有限公司 | Drive control circuit and drive control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2533553B2 (en) * | 1987-07-21 | 1996-09-11 | 株式会社日立製作所 | Electric circuit burnout prevention circuit |
| JP3779838B2 (en) * | 1999-03-19 | 2006-05-31 | 新日本無線株式会社 | Current limit circuit |
| JP3896102B2 (en) * | 2003-07-16 | 2007-03-22 | 埼玉日本電気株式会社 | POWER CONTROL CIRCUIT, MOBILE COMMUNICATION DEVICE, AND ITS POWER CONTROL METHOD |
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- 2022-12-06 JP JP2022195018A patent/JP7302084B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227778A (en) * | 2008-02-19 | 2008-07-23 | 东南大学 | Self-excited oscillation type high power LED constant-current driving circuit |
| CN102711307A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Dimmable light-emitting diode (LED) drive circuit and lamp |
| CN109032042A (en) * | 2018-09-11 | 2018-12-18 | 中国地质大学（武汉） | A kind of discharge circuit with constant pressure and flow |
| CN209994289U (en) * | 2019-05-15 | 2020-01-24 | 厦门立达信照明有限公司 | Drive control circuit and drive control device |
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|---|---|
| CN115395769B (en) | 2023-02-03 |
| JP2024062906A (en) | 2024-05-10 |
| JP7302084B1 (en) | 2023-07-03 |
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Address after: Building 1, 175 Songbei Road, Suzhou Industrial Park, Jiangsu Province, 215000 Patentee after: Suzhou Beiang Intelligent Technology Co.,Ltd. Address before: Building 1, 175 Songbei Road, Suzhou Industrial Park, Jiangsu Province, 215000 Patentee before: SUZHOU BEIANG TECHNOLOGY Ltd. |