CN116111822A - Impact current suppression circuit of switch - Google Patents
Impact current suppression circuit of switch Download PDFInfo
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- CN116111822A CN116111822A CN202310173446.3A CN202310173446A CN116111822A CN 116111822 A CN116111822 A CN 116111822A CN 202310173446 A CN202310173446 A CN 202310173446A CN 116111822 A CN116111822 A CN 116111822A
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- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
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- 230000005669 field effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- 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
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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
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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
A surge current suppression circuit of a switch relates to the technical field of electronic circuits. The surge current suppression circuit of the switch comprises a switching power supply, a current limiting module and a short circuit module. The switching power supply comprises a power supply module and a transformer T1, wherein the input end of the power supply module is connected with the input end of the switching power supply, and the output end of the power supply module is connected with the output end of the switching power supply; the first input end of the transformer T1 is connected with the input end of the power supply module, and the second input end of the transformer T1 is connected with the output end of the power supply module; the first output end of the transformer T1 is connected with the voltage output end of the switching power supply; the current limiting module is used for inhibiting the impact current when the switching power supply is started; when the switching power supply works, the first control end of the short circuit module receives the voltage output by the voltage output end of the switching power supply, and the second control end receives the voltage output by the second output end of the transformer T1 so as to maintain the normal work of the impact current suppression circuit.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a surge current suppression circuit of a switch.
Background
The rush current is a peak current flowing into the switching power supply at the moment of turning on the switching power supply. During the start-up of the switching power supply, a large current is generated by charging the large capacity capacitor, and the large current is several times or even tens times larger than the normal current of the system (i.e. surge current). This may cause the voltage of the ac supply line to drop, thereby affecting the operation of all devices connected to the same ac supply line, and sometimes also blowing components such as fuses and rectifier diodes, which must be limited.
In the design of a switching power supply, the surge current is a factor to be considered, and the maximum value of the surge current needs to be limited so as not to cause line damage or influence the normal operation of other electrical equipment. The following methods are used to suppress the impact current:
1. the input circuit is connected with the thermistor in series, the thermistor can keep a certain resistance value at the normal temperature of 25 ℃, the impact current can be restrained when the switching power supply is started, after the switching power supply works normally, the temperature rises, the resistance value of the thermistor drops, the current of the switching power supply in normal working can be maintained, and the line loss is reduced. However, when the switching power supply is in a thermo-mechanical state, the thermistor is approximately in a short-circuit state, and when the switching power supply is started, the thermistor loses the effect of suppressing the rush current.
2. The power resistor is connected in parallel with the silicon controlled rectifier or the MOS tube, and the impact current is reduced through the power resistor before the silicon controlled rectifier or the MOS tube is not conducted when the switching power supply is started; after the thyristor or the MOS tube works normally, the power resistor is short-circuited. However, when the silicon controlled rectifier is adopted, the minimum current is required to be kept when the silicon controlled rectifier is conducted, so that the power consumption is increased, and the efficiency is reduced; when the MOS tube is adopted, the MOS tube is provided with the body diode, so that the MOS tube cannot be completely disconnected when used for an alternating current circuit, and can only be used for a direct current circuit.
3. When the switching power supply is started, the impact current is reduced through the power resistor by adopting a mode that the relay is connected with the power resistor in parallel; when the relay works normally, the power resistor is short-circuited. However, when the relay works, the electromagnetic winding of the relay needs to consume certain power consumption, the standby power consumption is relatively large, and when the switching power supply is rapidly switched on and off, the output voltage of the switching power supply cannot be rapidly powered off along with the turn-off of the alternating current, and the relay cannot be reset at any time to lose the function.
Disclosure of Invention
The invention mainly solves the technical problems that: the switching power supply is started, so that the existence of the rush current easily causes line damage.
According to a first aspect, in one embodiment there is provided a rush current suppression circuit for a switch, comprising: the switching power supply comprises an input end, an output end and a voltage output end; the input end is connected with a live wire, and the output end is connected with a zero line; when the switching power supply is started, the input end is connected with the output end; when the switching power supply works, the input end is connected with the voltage output end; the switching power supply comprises a power supply module and a transformer T1, wherein the input end of the power supply module is connected with the input end of the switching power supply, and the output end of the power supply module is connected with the output end of the switching power supply; the input end of the transformer T1 comprises a first input end and a second input end, the first input end of the transformer T1 is connected with the input end of the power supply module, and the second input end of the transformer T1 is connected with the output end of the power supply module; the output end of the transformer T1 comprises a first output end and a second output end, and the first output end of the transformer T1 is connected with the voltage output end of the switching power supply;
the current limiting module is used for inhibiting impact current when the switching power supply is started; the first end of the current limiting module is used for being connected with a zero line, and the second end of the current limiting module is used for being connected with a load of the impact current suppression circuit;
the first end of the short circuit module is connected with the first end of the current limiting module, the second end of the short circuit module is connected with the second end of the current limiting module, the first control end of the short circuit module is connected with the voltage output end of the switching power supply, and the second control end of the short circuit module is connected with the second output end of the transformer T1; when the switching power supply works, the first control end of the short circuit module receives the voltage output by the voltage output end of the switching power supply, and the second control end receives the voltage output by the second output end of the transformer T1 so as to maintain the normal work of the impact current suppression circuit.
In one embodiment, the short-circuit module includes a transistor Q1 and a transistor Q2, where a first end of the transistor Q1 is used as a first end of the short-circuit module, a second end of the transistor Q1 is connected to a first end of the transistor Q2 and then used as a second control end of the short-circuit module, and a second end of the transistor Q2 is used as a second end of the short-circuit module; the control ends of the transistor Q1 and the transistor Q2 are connected and then serve as a first control end of the short circuit module.
In one embodiment, the current limiting module includes a current limiting resistor R1, a first end of the current limiting resistor R1 is used as a first end of the current limiting module, and a second end of the current limiting resistor R1 is used as a second end of the current limiting module.
In one embodiment, the switching power supply further comprises a rectifying module; the first end of the rectifying module is connected with the first output end of the transformer T1, and the second end of the rectifying module is connected with the voltage output end of the switching power supply; the rectification module is used for rectifying the voltage output by the output end of the transformer T1.
In one embodiment, the rectifying module includes a rectifying diode D1, an input terminal of the rectifying diode D1 is used as a first terminal of the rectifying module, and an output terminal of the rectifying diode D1 is used as a second terminal of the rectifying module.
In one embodiment, the switching power supply further includes a filtering module, where the filtering module is configured to filter the voltage output by the first output terminal and the second output terminal of the rectified transformer T1; the first end of the filtering module is connected with the first output end of the transformer T1, and the second end of the filtering module is connected with the second output end of the transformer T1.
In one embodiment, the filtering module includes a filtering capacitor C1, where a first end of the filtering capacitor C1 is used as a first end of the filtering module, and a second end of the filtering capacitor C1 is used as a second end of the filtering module.
In one embodiment, the surge current suppression circuit further includes a voltage step-down module, where the voltage step-down module is configured to reduce a voltage input from a voltage output terminal of the switching power supply to a first control terminal of the short circuit module; the first end of the voltage reducing module is connected with the voltage output end of the switching power supply, and the second end of the voltage reducing module is connected with the second control end of the short circuit module.
In one embodiment, the buck module includes a buck resistor R2, a first terminal of the buck resistor R2 being a first terminal of the buck module, and a second terminal of the buck resistor R2 being a second terminal of the buck module.
In one embodiment, the transistors Q1 and Q2 are bipolar transistors or field effect transistors.
The surge current suppression circuit of the switch according to the embodiment comprises a switching power supply, a current limiting module and a short circuit module. When the switching power supply is started, the current limiting module is used for inhibiting the impact current; when the switching power supply works, the current limiting module is short-circuited through the short-circuit module, so that the normal work of the impact current suppression circuit is maintained. The switching power supply comprises a power supply module and a transformer T1, and the transformer T1 is used for realizing the isolation between the voltage accessed by the switching power supply and the voltage accessed by the short circuit module while transforming the voltage through the transformer T1, so that the operation safety of the whole impulse current suppression circuit is ensured. Meanwhile, the short circuit module is connected to the voltage output end of the switching power supply, and can normally output voltage when the switching power supply works, so that the short circuit module can be conducted when the switching power supply can normally output voltage, and the power consumption of the current limiting module in the impact current suppression circuit is reduced.
Drawings
FIG. 1 is a schematic diagram of a surge current suppression circuit of a switch according to an embodiment;
FIG. 2 is a schematic diagram of a switching power supply according to an embodiment;
FIG. 3 is a circuit diagram of the inrush current suppression circuit of a switch according to an embodiment;
FIG. 4 is a schematic diagram of a second embodiment of a switching power supply;
FIG. 5 is a schematic diagram II of a rush current suppression circuit of a switch according to an embodiment;
fig. 6 is a circuit connection diagram of a rush current suppression circuit of a switch with a load of an embodiment.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
Referring to fig. 1, the present application provides a rush current suppression circuit of a switch, which includes a switching power supply 100, a current limiting module 200, and a short circuit module 300.
In some embodiments, the switching power supply 100 includes an input terminal, an output terminal, and a voltage output terminal, where the input terminal of the switching power supply 100 is connected to a live wire, and the output terminal of the switching power supply 100 is connected to a neutral wire. When the switching power supply 100 is started, the voltage output by the zero line and the live line connected to the switching power supply 100 charges the filter energy storage capacitor in the switching power supply 100, and the current for charging the filter energy storage capacitor is large, so that the load of the switching power supply 100 is heavy, the voltage output by the voltage output end of the switching power supply 100 is small and can be almost ignored, and the input end and the output end of the switching power supply are connected. After several tens of milliseconds, the voltage output end of the switching power supply 100 can normally output voltage, at this time, the switching power supply 100 normally works, and the input end is connected with the voltage output end.
Referring to fig. 2, in some embodiments, the switching power supply 100 includes a power module 110 and a transformer T1120. Referring to fig. 3, an input terminal of the power module 110 is connected to an input terminal of the switching power supply 100, and an output terminal of the power module 110 is connected to an output terminal of the switching power supply 100. The input terminal of the transformer T1120 includes a first input terminal (i.e., the connection port labeled 1 in fig. 3) and a second input terminal (i.e., the connection port labeled 2 in fig. 3), the first input terminal of the transformer T1120 is connected to the input terminal of the power module 110, and the second input terminal of the transformer T1120 is connected to the output terminal of the power module 110. The output terminal of the transformer T1120 includes a first output terminal (i.e., a connection terminal denoted by 3 in fig. 3) and a second output terminal (i.e., a connection terminal denoted by 4 in fig. 3), and the first output terminal of the transformer T1120 is connected to the voltage output terminal of the switching power supply 100.
When the switching power supply 100 is started, current flows into the input end of the switching power supply 100 through the live wire and then flows into the zero wire through the output end of the switching power supply 100, and because the current adopted by the impact current suppression circuit of the switch is alternating current, the current can flow into the output end of the switching power supply 100 through the zero wire and then flows into the live wire through the input end of the switching power supply 100. When the switching power supply 100 operates, the power supply module 110 can be normally discharged, so that the transformer T1120 can normally operate, and the voltage output terminal of the switching power supply 100 can normally output voltage.
In some embodiments, the current limiting module 200 is configured to suppress an inrush current of the switching power supply 100 when the switching power supply 100 is started. The first end of the current limiting module 200 is connected to the zero line, and the second end of the current limiting module is used for connecting with a load of the surge current suppression circuit.
In some embodiments, referring to fig. 3, the current limiting module 200 includes a current limiting resistor R1, wherein a first end of the current limiting resistor R1 is used as a first end of the current limiting module 200, and a second end of the current limiting resistor R1 is used as a second end of the current limiting module 200. When the switching power supply 100 is started, since the initial voltage of the filter energy storage capacitor is zero, a large surge current (i.e., a surge current) is formed at the moment when the filter energy storage capacitor is charged, so that when the switching power supply 100 is started, the surge current is suppressed by the current limiting resistor R1 in order to prevent the surge current from affecting the surge current suppressing circuit.
In some embodiments, a first end of the short-circuit module 300 is connected to a first end of the current-limiting module 200, a second end of the short-circuit module 300 is connected to a second end of the current-limiting module 200, a first control end of the short-circuit module 300 is connected to a voltage output end of the switching power supply 100, and a second control end of the short-circuit module 300 is connected to a second output end of the transformer T1120. When the switching power supply 100 works, the first output end and the second output end of the transformer T1120 can normally output voltages, so that the first control end of the short-circuit module 300 receives the voltage output by the voltage output end of the switching power supply 100, and the second control end of the short-circuit module 300 receives the voltage output by the second output end of the transformer T1120, so that the short-circuit module 300 works and the current-limiting resistor R1 is shorted out, so as to maintain the normal working of the impact current suppression circuit.
In some embodiments, referring to fig. 3, the short-circuit module 300 includes a transistor Q1 and a transistor Q2, wherein a first end of the transistor Q1 is used as a first end of the short-circuit module 300, a second end of the transistor Q1 is connected to a first end of the transistor Q2 and then used as a second control end of the short-circuit module 300, a second end of the transistor Q2 is used as a second end of the short-circuit module 300, and control ends of the transistor Q1 and the transistor Q2 are connected and then used as a first control end of the short-circuit module 300.
It should be noted that the transistor in the present application may be any transistor, such as a bipolar transistor (BJT) or a Field Effect Transistor (FET). When the transistor is a bipolar transistor, the control electrode refers to the grid electrode of the bipolar transistor, the first end can be the collector electrode or the emitter electrode of the bipolar transistor, the corresponding second end can be the emitter electrode or the collector electrode of the bipolar transistor, and in the practical application process, the 'emitter electrode' and the 'collector electrode' can be interchanged according to the signal flow direction; when the transistor is a field effect transistor, the control end refers to the gate of the field effect transistor, the first end may be the drain or the source of the field effect transistor, and the corresponding second end may be the source or the drain of the field effect transistor, where the "source" and the "drain" may be interchanged according to the signal flow direction in the practical application process.
Taking the field effect transistor with the transistor Q1 and the transistor Q2 as two sources connected as an example, when the switching power supply 100 works, the output end of the transformer T1120 normally outputs a voltage, and the voltage output end of the switching power supply 100 also normally outputs a voltage. When the voltage output by the transformer T1120 is applied to the sources of the transistor Q1 and the transistor Q2 through the second control terminal of the shorting module 300, and the voltage output by the voltage output terminal of the switching power supply 100 is applied to the drains of the transistor Q1 and the transistor Q2 through the first control terminal of the shorting module 300, the transistor Q1 and the transistor Q2 are turned on, so that the current limiting resistor R1 is shorted, the load of the surge current suppression circuit is restored to the load of the circuit, and the current flowing through the surge current suppression circuit is normal at the moment, so that the normal operation of the surge current suppression circuit can be maintained.
Referring to fig. 4, in some embodiments, the switching power supply 100 further includes a rectifying module 130 and a filtering module 140.
In some embodiments, the rectifying module 130 is configured to rectify the voltage output by the output terminal of the transformer T1120, the first terminal of the rectifying module 130 is connected to the first output terminal of the transformer T1, and the second terminal of the rectifying module 500 is connected to the voltage output terminal of the switching power supply.
In some embodiments, referring to fig. 3, the rectifying module 130 includes a rectifying diode D1, an input end of the rectifying diode D1 is used as a first end of the rectifying module 130, and an output end of the rectifying diode D1 is used as a second end of the rectifying module 130. When the voltage is output from the first output terminal of the transformer T1120, the voltage is rectified by the rectifying diode D1.
In some embodiments, the filtering module 140 is configured to filter the voltage output by the output terminal of the rectified transformer T1120. The first end of the filtering module 140 is connected to the first output end of the transformer T1120, and the second end of the filtering module 140 is connected to the second output end of the transformer T1120.
In some embodiments, referring to fig. 3, the filter module 140 includes a filter capacitor C1, wherein a first end of the filter capacitor C1 is used as a first end of the filter module 140, and a second end of the filter capacitor C1 is used as a second end of the filter module 140.
Referring to fig. 5, in some embodiments, the inrush current suppression circuit of the switch further includes a buck module 400.
In some embodiments, the step-down module 400 is configured to reduce the voltage input to the first control terminal of the short-circuit module 300 from the voltage output terminal of the switching power supply 100. The first end of the voltage reducing module 400 is connected to the voltage output end of the switching power supply 100, and the second end of the voltage reducing module 400 is connected to the second control end of the short circuit module 300.
In some embodiments, referring to fig. 3, the buck module 400 includes a buck resistor R2, wherein a first end of the buck resistor R2 is used as a first end of the buck module 400, and a second end of the buck resistor R2 is used as a second end of the buck module 400.
Referring to fig. 6, when the inrush current suppression circuit of the switch is connected to the load corresponding to the switching power supply 100, the positive electrode of the load is connected to the live wire, and the negative electrode of the load is connected to the second end of the current limiting resistor R1, that is, the second end of the transistor Q2. When the switching power supply 100 is started, the current flowing through the channel at the switching power supply 100 is: the current enters the input end of the power module 110 in the switching power supply 100 through the live wire, and then flows into the zero line through the output end of the power module 110 in the switching power supply 100. At this time, the switching power supply 100 generates an inrush current, so that a current at the load flows through: the current enters the positive electrode of the load through the live wire, flows into the current-limiting resistor R1 through the negative electrode of the load, and flows into the zero line after the impact current is counteracted by the current-limiting resistor R1. Since the current connected to the surge current suppression circuit is alternating current, the other half period of the alternating current flows in the same direction as the channel flowing through the channel and in the opposite direction.
When the switching power supply 100 is operated, no rush current exists at this time, and a current flowing through the channel at the switching power supply 100 is the same as a current flowing through the channel when the switching power supply 100 is started. The current flow path at the load is: the current enters the positive electrode of the load through the live wire, flows into the short circuit module 300 through the negative electrode of the load, the transistor Q1 and the transistor Q2 in the short circuit module 300 are conducted, and the current flows into the zero line through the transistor Q1 and the transistor Q2. Since the current connected to the surge current suppression circuit is alternating current, the other half period of the alternating current flows in the same direction as the channel flowing through the channel and in the opposite direction. In the present application, two transistors are connected in series, and the anodes of the internal diodes of the transistors are connected in series, so that when the positive half-period of the alternating current flows through the short-circuit module 300, the transistor Q1 and the transistor Q2 cannot be turned on; likewise, transistor Q1 and transistor Q2 will not conduct during the negative half-cycle of the ac current flowing through shorting module 300. And further, the surge current suppression circuit of the switch can be safely applied to an alternating current line. And, devices employing transistors are less costly than relays.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (10)
1. A rush current suppression circuit for a switch, comprising:
the switching power supply comprises an input end, an output end and a voltage output end; the input end is connected with a live wire, and the output end is connected with a zero line; when the switching power supply is started, the input end is connected with the output end; when the switching power supply works, the input end is connected with the voltage output end; the switching power supply comprises a power supply module and a transformer T1, wherein the input end of the power supply module is connected with the input end of the switching power supply, and the output end of the power supply module is connected with the output end of the switching power supply; the input end of the transformer T1 comprises a first input end and a second input end, the first input end of the transformer T1 is connected with the input end of the power supply module, and the second input end of the transformer T1 is connected with the output end of the power supply module; the output end of the transformer T1 comprises a first output end and a second output end, and the first output end of the transformer T1 is connected with the voltage output end of the switching power supply;
the current limiting module is used for inhibiting impact current when the switching power supply is started; the first end of the current limiting module is connected with a zero line, and the second end of the current limiting module is used for being connected with a load of the impact current suppression circuit;
the first end of the short circuit module is connected with the first end of the current limiting module, the second end of the short circuit module is connected with the second end of the current limiting module, the first control end of the short circuit module is connected with the voltage output end of the switching power supply, and the second control end of the short circuit module is connected with the second output end of the transformer T1; when the switching power supply works, the first control end of the short circuit module receives the voltage output by the voltage output end of the switching power supply, and the second control end receives the voltage output by the second output end of the transformer T1 so as to maintain the normal work of the impact current suppression circuit.
2. The surge current suppression circuit of claim 1, wherein the shorting module comprises a transistor Q1 and a transistor Q2, a first terminal of the transistor Q1 being a first terminal of the shorting module, a second terminal of the transistor Q1 being connected to the first terminal of the transistor Q2 and then being a second control terminal of the shorting module, a second terminal of the transistor Q2 being a second terminal of the shorting module; the control ends of the transistor Q1 and the transistor Q2 are connected and then serve as a first control end of the short circuit module.
3. The inrush current suppression circuit of claim 1, wherein the current limiting module comprises a current limiting resistor R1, a first terminal of the current limiting resistor R1 being a first terminal of the current limiting module, and a second terminal of the current limiting resistor R1 being a second terminal of the current limiting module.
4. The inrush current suppression circuit of claim 1, wherein the switching power supply further comprises a rectifying module; the first end of the rectifying module is connected with the first output end of the transformer T1, and the second end of the rectifying module is connected with the voltage output end of the switching power supply; the rectification module is used for rectifying the voltage output by the output end of the transformer T1.
5. The surge current suppression circuit of claim 4, wherein the rectifying module includes a rectifying diode D1, an input terminal of the rectifying diode D1 being a first terminal of the rectifying module, and an output terminal of the rectifying diode D1 being a second terminal of the rectifying module.
6. The inrush current suppression circuit of claim 4, the switching power supply further comprising a filtering module for filtering the voltage output by the first output terminal and the second output terminal of the rectified transformer T1; the first end of the filtering module is connected with the first output end of the transformer T1, and the second end of the filtering module is connected with the second output end of the transformer T1.
7. The surge current suppression circuit of claim 6, wherein the filter module includes a filter capacitor C1, a first terminal of the filter capacitor C1 being a first terminal of the filter module, and a second terminal of the filter capacitor C1 being a second terminal of the filter module.
8. The inrush current suppression circuit of claim 1, further comprising a buck module for reducing a voltage input from a voltage output of the switching power supply to the first control terminal of the short circuit module; the first end of the voltage reducing module is connected with the voltage output end of the switching power supply, and the second end of the voltage reducing module is connected with the second control end of the short circuit module.
9. The surge current suppression circuit of claim 8, wherein the buck module includes a buck resistor R2, a first terminal of the buck resistor R2 being a first terminal of the buck module, and a second terminal of the buck resistor R2 being a second terminal of the buck module.
10. The rush current suppression circuit of claim 1 wherein the transistor Q1 and the transistor Q2 are both bipolar transistors or field effect transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310173446.3A CN116111822A (en) | 2023-02-20 | 2023-02-20 | Impact current suppression circuit of switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310173446.3A CN116111822A (en) | 2023-02-20 | 2023-02-20 | Impact current suppression circuit of switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116111822A true CN116111822A (en) | 2023-05-12 |
Family
ID=86259801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310173446.3A Pending CN116111822A (en) | 2023-02-20 | 2023-02-20 | Impact current suppression circuit of switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116111822A (en) |
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2023
- 2023-02-20 CN CN202310173446.3A patent/CN116111822A/en active Pending
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