CN117977512A - Overcurrent protection method, power supply circuit and electric equipment - Google Patents

Overcurrent protection method, power supply circuit and electric equipment Download PDF

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Publication number
CN117977512A
CN117977512A CN202410134552.5A CN202410134552A CN117977512A CN 117977512 A CN117977512 A CN 117977512A CN 202410134552 A CN202410134552 A CN 202410134552A CN 117977512 A CN117977512 A CN 117977512A
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CN
China
Prior art keywords
storage capacitor
energy storage
voltage
switch
resistor
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Pending
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CN202410134552.5A
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Chinese (zh)
Inventor
张广斌
邹宏亮
杨华生
吴帆
解超群
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Filing date
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202410134552.5A priority Critical patent/CN117977512A/en
Publication of CN117977512A publication Critical patent/CN117977512A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention discloses an overcurrent protection method, a power circuit and electric equipment. The method is applied to a power circuit of electric equipment, the power circuit comprises a charging resistor and a switch which are arranged in parallel, and a parallel circuit formed by the charging resistor and the switch is connected into the power circuit, and the method comprises the following steps: after a controller of the electric equipment starts to work, detecting the voltage of the energy storage capacitor; and controlling the conduction state of the switch according to the change rate of the voltage of the energy storage capacitor. The invention can avoid the problem of damage to circuit components caused by overlarge current passing through the energy storage capacitor, and improves the reliability of electric equipment.

Description

Overcurrent protection method, power supply circuit and electric equipment
Technical Field
The invention relates to the technical field of electronic power, in particular to an overcurrent protection method, a power circuit and electric equipment.
Background
Fig. 1 is a conventional power supply circuit, as shown in fig. 1, generally provided with a charging resistor and a switch connected in parallel, wherein the charging resistor is used for charging an energy storage capacitor, and when the energy storage capacitor is charged to a required voltage, the switch is controlled to be closed, and the charging resistor is short-circuited, so that normal power supply of electric equipment is realized. However, after the electric equipment is put into operation, due to the characteristics of the energy storage capacitor, when the power supply voltage is rapidly increased, the current flowing through the energy storage capacitor is increased, and when the current is overlarge, the damage of circuit components of the electric equipment can be caused.
The problem that after electric equipment is put into operation in the prior art, the power supply voltage is rapidly increased, the current flowing through the energy storage capacitor is increased, and circuit components of the electric equipment are easy to damage is solved, and an effective solution is not proposed at present.
Disclosure of Invention
The embodiment of the invention provides an overcurrent protection method, a power supply circuit and electric equipment, which are used for solving the problems that after the electric equipment is put into operation in the prior art, the power supply voltage is rapidly increased, the current flowing through an energy storage capacitor is increased, and circuit components of the electric equipment are easily damaged.
In order to solve the technical problems, the invention provides an overcurrent protection method, which is applied to a power circuit of electric equipment, wherein the power circuit comprises a charging resistor and a switch which are arranged in parallel, and a parallel circuit formed by the charging resistor and the switch is connected into the power circuit, and the overcurrent protection method comprises the following steps:
After a controller of the electric equipment starts to work, detecting the voltage of the energy storage capacitor;
and controlling the conduction state of the switch according to the change rate of the voltage of the energy storage capacitor.
Further, controlling the on state of the switch according to the rate of change of the energy storage capacitor voltage includes:
After the controller starts to work, judging whether the change rate of the voltage of the energy storage capacitor is smaller than or equal to a first preset change rate;
if yes, the switch is controlled to be conducted;
if not, the switch is controlled to be kept off.
Further, after controlling the switch to be turned on, the method further includes:
Continuing to detect the energy storage capacitor voltage;
after a preset time period, judging whether the change rate of the energy storage capacitor voltage is larger than a second preset change rate or not; wherein the second preset rate of change is greater than the first preset rate of change;
if yes, the switch is controlled to be disconnected;
If not, the switch is controlled to be kept on.
Further, the resistance value of the charging resistor is adjustable, and if the change rate of the voltage of the energy storage capacitor is greater than a second preset change rate, before the switch is controlled to be turned off, the method further includes:
judging whether the change rate of the voltage of the energy storage capacitor is larger than a third preset change rate or not; wherein the third preset rate of change is greater than the second preset rate of change;
if yes, the resistance value of the charging resistor is controlled to be increased;
The switch is then controlled to open.
The invention also provides a power supply circuit, which comprises a charging resistor and a switch which are arranged in parallel, wherein a parallel circuit formed by the charging resistor and the switch is connected into the power supply circuit, and the power supply circuit further comprises:
The first end of the voltage detection module is connected with the positive electrode of the energy storage capacitor, the second end of the voltage detection module is connected with the negative electrode of the energy storage capacitor, and the third end of the voltage detection module is connected with the controller;
the controller is used for detecting the voltage of the energy storage capacitor after the controller of the electric equipment starts to work, and then controlling the conduction state of the switch according to the change rate of the voltage of the energy storage capacitor.
Further, the voltage detection module includes:
A first resistor and a second resistor;
the first end of the first resistor is connected with the positive electrode of the energy storage capacitor, and the second end of the first resistor is connected with the first end of the second resistor;
And the second end of the second resistor is connected with the negative electrode of the energy storage capacitor, and a circuit led out between the first resistor R1 and the second resistor is connected with the controller.
Further, the resistance value of the charging resistor is adjustable.
The invention also provides electric equipment which is characterized by comprising the power supply circuit and applying the overcurrent control method.
Further, the electric equipment is an air conditioning unit.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described over-flow control method.
By applying the technical scheme of the invention, after the controller of the electric equipment starts to work, the voltage of the energy storage capacitor is detected; the on state of the switch is controlled according to the change rate of the voltage of the energy storage capacitor, so that the total resistance in the circuit is changed, the problem that circuit components are damaged due to overlarge current passing through the energy storage capacitor can be avoided, and the reliability of electric equipment is improved.
Drawings
FIG. 1 is a prior art power supply circuit;
FIG. 2 is a flow chart of an over-current protection method according to an embodiment of the invention;
FIG. 3 is a flow chart of an over-current protection method according to another embodiment of the present invention;
Fig. 4 is a block diagram of a power supply circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the resistances in embodiments of the present invention, these resistances should not be limited to these terms. These terms are only used to distinguish between different resistances. For example, a first resistor may also be referred to as a second resistor, and similarly, a second resistor may also be referred to as a first resistor, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product 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 product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such elements.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a conventional power supply circuit, as shown in fig. 1, the conventional power supply circuit is generally provided with a charging resistor R0 and a switch K1 connected in parallel, the charging resistor R0 is used for charging the energy storage capacitor, and after the energy storage capacitor is charged to a required voltage, the switch K1 is controlled to be closed, so that the charging resistor R0 is short-circuited, and normal power supply of electric equipment is realized. However, after the electric equipment is put into operation, due to the characteristics of the energy storage capacitor, when the power supply voltage is rapidly increased, the current flowing through the energy storage capacitor is increased, and when the current is overlarge, the damage of circuit components of the electric equipment can be caused. As shown in fig. 1, the power supply circuit includes a charging resistor R0 and a switch K1, which are arranged in parallel, the parallel circuit formed by the charging resistor R0 and the switch K1 is connected to the power supply circuit, after the electric equipment is powered on, the terminal X1 and the terminal X2 generate a working voltage, the energy storage capacitor C is charged through the charging resistor R0 and the rectifier bridge, after the energy storage capacitor voltage meets the working voltage of the rear load RL, the controller MCU starts to work, the energy storage capacitor voltage continuously rises, the charging current of the energy storage capacitor C continuously decreases, and when the current is less than a certain threshold (the sustainable maximum current of the controller), the relay K1 is closed, so that the charging resistor R0 is prevented from generating power loss and continuous heating damage. Because the voltage VCC of the energy storage capacitor cannot be detected, the closing time of K1 needs to be adjusted each time according to the load of the controller and the size of the energy storage capacitor, and the development time of the controller is prolonged. And when the power supply has large voltage variation fluctuation or the power supply is frequently started and stopped, the current of the energy storage capacitor cannot be judged, and when the frequent voltage variation occurs, the switch K1 cannot be timely disconnected, so that components such as the fuse tube FUS1, the rectifier bridge DB1 and the like in the circuit can be damaged.
In order to solve the above-mentioned technical problems, the present embodiment provides an over-current protection method applied to the above-mentioned power circuit, fig. 2 is a flowchart of the over-current protection method according to an embodiment of the present invention, and as shown in fig. 2, the over-current protection method includes:
s101, detecting the voltage of the energy storage capacitor after the controller of the electric equipment starts to work.
When the electric equipment starts to be electrified, the terminal X1 and the terminal X2 generate working voltage, the energy storage capacitor C is charged through the charging resistor R0 and the rectifier bridge, and when the energy storage capacitor voltage meets the rear-end load RL working voltage, the controller starts to work, and the energy storage capacitor voltage is detected through the controller.
S102, controlling the conduction state of the switch K1 according to the change rate of the energy storage capacitor voltage.
After the controller starts to work, the voltage of the energy storage capacitor still continuously rises for a period of time, so that the change condition of the bus voltage needs to be monitored, and the charging resistor R0 is cut out of the circuit at a proper time, so that unnecessary power loss and continuous heating damage of the charging resistor R0 are avoided.
In the overcurrent protection method of the embodiment, after a controller of electric equipment starts to work, the voltage of an energy storage capacitor is detected; the on state of the switch K1 is controlled according to the change rate of the voltage of the energy storage capacitor, so that the total resistance in the circuit is changed, the problem that circuit components are damaged due to overlarge current passing through the energy storage capacitor can be avoided, and the reliability of electric equipment is improved.
The current I ＝ C*(dV d c t c) flowing through the bus low capacitance, wherein C is the capacitance value of the energy storage capacitor, vcc is the energy storage capacitor voltage, that is, the current flowing through the energy storage capacitor is equal to the product of the capacitance value of the energy storage capacitor and the change rate of the energy storage capacitor voltage, if the change rate of the energy storage capacitor voltage is larger, the current flowing through the energy storage capacitor will be larger, if the switch K1 is controlled to be turned on at this time, the charging resistor R0 is controlled to be cut off, the current will be further increased, the risk of damaging the components in the circuit is caused, and the switch K1 can be controlled to be turned on after the change rate of the energy storage capacitor voltage needs to be kept low to a certain extent, therefore, the on state of the switch K1 is controlled according to the change rate of the energy storage capacitor voltage, which includes: after the controller starts to work, judging whether the change rate of the voltage of the energy storage capacitor is smaller than or equal to a first preset change rate; if yes, the control switch K1 is turned on; if not, the control switch K1 remains open.
After the controller starts to work for a period of time, the voltage will keep a certain range under normal conditions, but if the power supply has larger fluctuation, the voltage of the energy storage capacitor will change greatly at this time, so that the current in the circuit is too large, and therefore, after the control switch K1 is turned on, the method further comprises: continuously detecting the voltage of the energy storage capacitor; after the preset duration, judging whether the change rate of the voltage of the energy storage capacitor is larger than a second preset change rate; wherein the second preset rate of change is greater than the first preset rate of change; if yes, the control switch K1 is turned off, so that the charging resistor R0 is connected into the circuit, and the current passing through the circuit is reduced; if not, the control switch K1 remains on.
If the change rate of the energy storage capacitor continues to increase, the current in the circuit cannot be reduced through the original charging resistor R0, and at this time, the resistance of the charging resistor R0 needs to be increased, so in this embodiment, the resistance of the charging resistor R0 is adjustable, and if the change rate of the voltage of the energy storage capacitor is greater than the second preset change rate, before the control switch K1 is turned off, the method further includes: judging whether the change rate of the voltage of the energy storage capacitor is larger than a third preset change rate or not; wherein the third preset rate of change is greater than the second preset rate of change; if yes, the resistance value of the control charging resistor R0 is increased; the control switch K1 is then opened.
Example 2
The present embodiment provides another over-current protection method, and fig. 3 is a flowchart of the over-current protection method according to another embodiment of the present invention, and as shown in fig. 3, the over-current protection method includes:
s1, controlling a power supply to start supplying power, enabling a controller to be electrified, and charging an energy storage capacitor by current through a charging resistor R0.
And S2, when the voltage of the energy storage capacitor is larger than the load working voltage Vmin, automatically triggering the controller to start working, and detecting the voltage of the energy storage capacitor.
As shown in fig. 1 mentioned above, the existing power supply circuit is generally provided with a charging resistor R0 and a switch K1 connected in parallel, the energy storage capacitor is charged through the charging resistor R0, and after the energy storage capacitor is charged to a required voltage, the switch K1 is controlled to be closed, so that the charging resistor R0 is short-circuited, and normal power supply of the electric equipment is realized. However, after the electric equipment is put into operation, due to the characteristics of the energy storage capacitor, when the power supply voltage is rapidly increased, the current flowing through the energy storage capacitor is increased, and when the current is overlarge, the damage of circuit components of the electric equipment can be caused. As shown in fig. 1, the power supply circuit includes a charging resistor R0 and a switch K1, which are arranged in parallel, the parallel circuit formed by the charging resistor R0 and the switch K1 is connected into the power supply circuit, after the electric equipment is powered on, the terminal X1 and the terminal X2 generate working voltage, the energy storage capacitor C is charged through the charging resistor R0 and the rectifier bridge, after the energy storage capacitor voltage meets the working voltage of the rear load RL, the controller starts to work, the energy storage capacitor voltage continuously rises, the charging current of the energy storage capacitor C continuously decreases, and when the current is smaller than a certain threshold (the bearable maximum current of the controller), the relay K1 is closed, so that the charging resistor R0 is prevented from generating power loss and continuous heating damage. Because the voltage VCC of the energy storage capacitor cannot be detected, the closing time of K1 needs to be adjusted each time according to the load of the controller and the size of the energy storage capacitor, and the development time of the controller is prolonged. And when the power supply has large voltage variation fluctuation or the power supply is frequently started and stopped, the current of the energy storage capacitor cannot be judged, and when the frequent voltage variation occurs, the switch K1 cannot be timely disconnected, so that components such as the fuse FUS1 and the rectifier bridge DB1 can be damaged.
S3, judging whether the change rate of the energy storage capacitor voltage is smaller than or equal to a first preset change rate, if so, executing the step S4, and if not, returning to the step S3.
And S4, controlling the switch K1 to be closed, and shorting the charging resistor R0.
In the control method of the embodiment, when the unit is electrified, as the switch K1 is in an off state, the current charges the rear-end capacitor through the resistor R0, the voltage Vcc of the energy storage capacitor continuously rises, after the Vcc voltage reaches the load working voltage Vmin, the controller starts to work, the voltage Vcc of the energy storage capacitor is detected through the first resistor R1, the second resistor R2 and the third resistor R3, and when the voltage Vcc of the energy storage capacitor is smaller than or equal to a first preset change rate, the relay K1 is controlled to be closed, and the electric equipment is put into operation.
Low capacity current through busWherein, C is the capacitance of the energy storage capacitor, vcc is the voltage of the energy storage capacitor, that is, the current flowing through the energy storage capacitor is equal to the product of the capacitance of the energy storage capacitor and the change rate of the voltage of the energy storage capacitor, if the change rate of the voltage of the energy storage capacitor is larger, the current flowing through the energy storage capacitor will be larger, if the switch K1 is controlled to be turned on, the charging resistor R0 is controlled to be cut out, the current will be further raised, the risk of damaging the components in the circuit is caused, and after the change rate of the voltage of the energy storage capacitor is kept to a certain extent, the switch K1 is controlled to be turned on, therefore, if the change rate of the voltage of the energy storage capacitor is smaller than or equal to the first preset change rate, the switch K1 is controlled to be turned on, so that the charging resistor R0 is short-circuited, and the current in the circuit is avoided.
S5, judging whether the closing time t of the switch K1 is greater than or equal to a preset t1, if so, executing the step S6, and if not, repeatedly executing the step S5.
And S6, judging whether the change rate of the voltage of the energy storage capacitor is larger than a second preset change rate, if so, executing the step S7, and if not, repeating the step S6.
S7, the control switch K1 is turned off.
When the input voltage is larger than the voltage Vcc of the energy storage capacitor, the rectifier bridge DB1 is conducted to charge the energy storage capacitor, when the voltage Vcc is suddenly changed, the circuit generates large current, if the current is not controlled, components in the circuit can be damaged, when the voltage fluctuation of the voltage Vcc of the energy storage capacitor is detected in real time, the voltage fluctuation of the voltage Vcc of the energy storage capacitor is larger than the second preset change rate, the large current passes through the circuit, related electronic components can be damaged, when the voltage change rate of the voltage Vcc of the energy storage capacitor is detected in real time, when the voltage Vcc of the energy storage capacitor is excessively large, the power switch tube Q1 is closed, the switch K1 is further controlled to be disconnected, the charging current of the energy storage capacitor is limited through the resistor R0, and the components such as a fuse tube are protected from being damaged. Switch K1 may be re-closed after the voltage stabilizes.
Example 3
The embodiment provides a power supply circuit, fig. 4 is a structural diagram of the power supply circuit according to an embodiment of the present invention, as shown in fig. 4, where the power supply circuit includes a charging resistor R0 and a switch K1 that are disposed in parallel, and a parallel circuit formed by the charging resistor R0 and the switch K1 is connected to the power supply circuit, and further includes: the first end of the voltage detection module 10 is connected with the positive electrode of the energy storage capacitor, the second end of the voltage detection module is connected with the negative electrode of the energy storage capacitor, and the third end of the voltage detection module is connected with the controller; the controller is used for detecting the voltage of the energy storage capacitor after the controller of the electric equipment starts to work, and then controlling the conduction state of the switch K1 according to the change rate of the voltage of the energy storage capacitor. The arrow direction in the figure is the current direction.
The power supply circuit of this embodiment has set up voltage detection module for after the controller of consumer begins work, detect energy storage capacitor voltage, through the on-state of controller according to the rate of change control switch K1 of energy storage capacitor voltage, and then change the total resistance in the circuit, can avoid the too big problem that leads to circuit components and parts to damage through energy storage capacitor's electric current, improved the reliability of consumer.
To achieve voltage detection, as shown in fig. 4, the voltage detection module 10 includes: a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected with the positive electrode of the energy storage capacitor, and the second end of the first resistor R2 is connected with the first end of the second resistor; and a second end of the second resistor R2 is connected with the negative electrode of the energy storage capacitor, and a circuit led out between the first resistor R1 and the second resistor R2 is connected with the controller. If the resistance of a single resistor is not appropriate, two resistors R11 and R12 in series can be selected to achieve the effect of the first resistor R1.
Because the energy storage capacitor voltage that detects probably has clutter, influences the detection precision, and voltage detection module still includes: a first end of the third resistor R3 is connected between the first resistor R1 and the second resistor R2, and a second end of the third resistor R3 is connected with the controller; a first end of the first capacitor C1 is connected to the first end of the third resistor R3, and a second end thereof is grounded; the first end of the second capacitor C2 is connected to the second end of the third resistor R3, and the second end thereof is grounded. The third resistor R3 and the first capacitor C1, and the third resistor R3 and the second capacitor C2 respectively form an RC filter to realize the filtering effect.
If the change rate of the energy storage capacitor continues to increase, the current in the circuit cannot be reduced through the original charging resistor R0, and at this time, the resistance of the charging resistor R0 needs to be increased, so in this embodiment, the resistance of the charging resistor R0 is adjustable. When the change rate of the voltage of the energy storage capacitor is larger than the third preset change rate, the resistance value of the charging resistor R0 can be controlled to be increased; and then the switch K1 is controlled to be opened.
Example 4
The embodiment provides electric equipment, which comprises the power supply circuit and is used for detecting the voltage of the energy storage capacitor after a controller of the electric equipment starts to work by applying the overcurrent control method of the embodiment; the on state of the switch K1 is controlled according to the change rate of the voltage of the energy storage capacitor, so that the problem that circuit components are damaged due to overlarge current passing through the energy storage capacitor can be avoided, and the reliability of electric equipment is improved.
In some embodiments of the present invention, the electric device is an air conditioning unit.
Example 5
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described overcurrent control method.
The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The overcurrent protection method is applied to a power supply circuit of electric equipment, the power supply circuit comprises a charging resistor and a switch which are arranged in parallel, and the parallel circuit formed by the charging resistor and the switch is connected into the power supply circuit, and is characterized by comprising the following steps:
After a controller of the electric equipment starts to work, detecting the voltage of the energy storage capacitor;
and controlling the conduction state of the switch according to the change rate of the voltage of the energy storage capacitor.
2. The method of claim 1, wherein controlling the on state of the switch according to the rate of change of the storage capacitor voltage comprises:
After the controller starts to work, judging whether the change rate of the voltage of the energy storage capacitor is smaller than or equal to a first preset change rate;
if yes, the switch is controlled to be conducted;
if not, the switch is controlled to be kept off.
3. The method of claim 2, wherein after controlling the switch to conduct, the method further comprises:
Continuing to detect the energy storage capacitor voltage;
after a preset time period, judging whether the change rate of the energy storage capacitor voltage is larger than a second preset change rate or not; wherein the second preset rate of change is greater than the first preset rate of change;
if yes, the switch is controlled to be disconnected;
If not, the switch is controlled to be kept on.
4. A method according to claim 3, wherein the resistance of the charging resistor is adjustable, and if the rate of change of the storage capacitor voltage is greater than a second predetermined rate of change, the method further comprises, prior to controlling the switch to open:
judging whether the change rate of the voltage of the energy storage capacitor is larger than a third preset change rate or not; wherein the third preset rate of change is greater than the second preset rate of change;
if yes, the resistance value of the charging resistor is controlled to be increased;
The switch is then controlled to open.
5. The utility model provides a power supply circuit, includes charging resistor and the switch of parallelly connected setting, charging resistor and the parallel circuit that the switch formed insert in the power supply circuit, its characterized in that still includes:
The first end of the voltage detection module is connected with the positive electrode of the energy storage capacitor, the second end of the voltage detection module is connected with the negative electrode of the energy storage capacitor, and the third end of the voltage detection module is connected with the controller;
the controller is used for detecting the voltage of the energy storage capacitor after the controller of the electric equipment starts to work, and then controlling the conduction state of the switch according to the change rate of the voltage of the energy storage capacitor.
6. The circuit of claim 5, wherein the voltage detection module comprises:
A first resistor and a second resistor;
the first end of the first resistor is connected with the positive electrode of the energy storage capacitor, and the second end of the first resistor is connected with the first end of the second resistor;
And the second end of the second resistor is connected with the negative electrode of the energy storage capacitor, and a circuit led out between the first resistor R1 and the second resistor is connected with the controller.
7. The circuit of claim 6, wherein the charging resistor has an adjustable resistance.
8. A powered device comprising the power supply circuit of any of claims 5 to 7 and applying the method of overcurrent control of any of claims 1 to 4.
9. The powered device of claim 8, wherein the powered device is an air conditioning unit.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1 to 4.
CN202410134552.5A 2024-01-31 2024-01-31 Overcurrent protection method, power supply circuit and electric equipment Pending CN117977512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410134552.5A CN117977512A (en) 2024-01-31 2024-01-31 Overcurrent protection method, power supply circuit and electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410134552.5A CN117977512A (en) 2024-01-31 2024-01-31 Overcurrent protection method, power supply circuit and electric equipment

Publications (1)

Publication Number Publication Date
CN117977512A true CN117977512A (en) 2024-05-03

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Application Number Title Priority Date Filing Date
CN202410134552.5A Pending CN117977512A (en) 2024-01-31 2024-01-31 Overcurrent protection method, power supply circuit and electric equipment

Country Status (1)

Country Link
CN (1) CN117977512A (en)

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