CN214626792U - Power supply device for reducing power on/off impact current - Google Patents
Power supply device for reducing power on/off impact current Download PDFInfo
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- CN214626792U CN214626792U CN202120585661.0U CN202120585661U CN214626792U CN 214626792 U CN214626792 U CN 214626792U CN 202120585661 U CN202120585661 U CN 202120585661U CN 214626792 U CN214626792 U CN 214626792U
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Abstract
The utility model provides a reduce switching on and shutting down impulse current's power supply unit. The current reduction circuit comprises a first resistor and an MOS (metal oxide semiconductor) tube; the first resistor is connected with the MOS tube in parallel. The power supply device for reducing the switching on and switching off impact current solves the problem that the impact current is large when an electric appliance is switched on and switched off in the prior art.
Description
Technical Field
The utility model belongs to the technical field of reduce switching on and shutting down impulse current technique and specifically relates to a reduce switching on and shutting down impulse current's power supply unit is related to.
Background
When the electric appliance works normally, the current is small, but when the electric appliance is started, overlarge impact current exists, the electrical energy loss on an electric line is increased by the overlarge starting current, and the power failure of a load overload power grid can be seriously caused; when an electric appliance is started, the electric appliance is mainly supplied to a rear-stage load by an AC/DC power supply through an input end, so that the reduction of the rush current of the power supply is urgent.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a reduce switching on and shutting down impulse current's power supply unit, the great problem of impulse current when this reduce switching on and shutting down impulse current's power supply unit can solve among the prior art electrical apparatus switching on and shutting down.
In order to achieve the above object, the present invention provides the following technical solutions:
a power supply apparatus for reducing switching inrush current, comprising:
the current reduction circuit comprises a first resistor and an MOS (metal oxide semiconductor) tube; the first resistor is connected with the MOS tube in parallel.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further, the current reduction circuit further comprises a rectifier bridge, wherein the rectifier bridge comprises four diodes, and the rectifier bridge is used for rectifying alternating current into direct current.
Further, the current reduction circuit further comprises a second resistor and a capacitor, and the second resistor is connected with the capacitor in parallel.
Further, the resistance of the first resistor is 20 ohms.
Further, the resistance of the second resistor is a virtual resistor.
Further, the current reduction circuit is provided with a first terminal and a second terminal, wherein the first terminal is an L pole, and the second terminal is an N pole.
The utility model has the advantages of as follows:
the utility model provides a power supply device for reducing the switch-on and switch-off impact current, which reduces the impact current of the power supply through a first resistor and an MOS tube which are connected in parallel; the problem of among the prior art electric appliance switching on and shutting down impulse current great is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a power supply device for reducing the switching on/off inrush current according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power supply device for reducing the switching on/off inrush current in an embodiment of the present invention.
Description of reference numerals:
the circuit comprises a current reduction circuit 10, a first resistor 101, a MOS (metal oxide semiconductor) tube 102, a rectifier bridge 103, a second resistor 104 and a capacitor 105.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-2, a power supply apparatus for reducing switching inrush current includes:
the current reduction circuit 10 comprises a first resistor 101 and a MOS tube 102; the first resistor 101 is connected in parallel with the MOS transistor 102.
When the electric appliance works normally, the current is small, but when the electric appliance equipment is started, overlarge impact current exists, the overlarge starting current increases the electric energy loss on an electric line, and the power failure of a load overload power grid can be seriously caused. Most of the existing power supplies adopt a thermistor with a negative temperature coefficient, the thermistor can prevent impulse current under the condition of normal temperature, after the thermistor is electrified, the temperature of the resistor becomes high, the resistance value becomes small, and when the thermistor is started in time-frequency conversion, the resistor is not started.
When an electric appliance is started, the electric appliance is mainly supplied to a rear-stage load by an AC/DC power supply through an input end, so that the reduction of the rush current of the power supply is urgent.
The power supply device capable of reducing the switching-on and switching-off impact current is a power supply device capable of reducing the starting impact current to a great extent, and the working principle of the power supply device is that after input alternating current is rectified by BR1, full-wave rectification voltage passes through a first resistor 101, the first resistor is R1, a capacitor 105, the capacitor is C1 and a second resistor loop, the second resistor is R2, the resistor of the first resistor 101 is 22 omega and returns to a negative electrode, the maximum impact current is calculated according to the maximum voltage of 300V, because the initial voltage of the C1 capacitor is zero, which is equivalent to short circuit, the maximum impact current is about 100A and is far larger than the current (about impact current 13A) of the first resistor 101 without the resistor of 22 omega.
After normal operation, the first resistor 101 is connected with the MOS tube 102 in parallel to operate, the low resistance (milliohm level) of the MOS tube 102 is negligible, D1 is powered from the L phase, D2 is powered from the N phase, C2 is subjected to voltage stabilization filtering, C4 is charged by D3 through the voltage division from R5R 6 to R7C 3, C4 has a delay effect (after a capacitor of C1 is fully charged, the MOS tube is turned on), and M1 is turned on at the moment through a gate from Z2 to R3Z 1 and a gate of M1 (Z1Z 2 has a clamping effect to prevent the gate voltage from being too high), and the loss is small because the on-resistance of M1 is even milliohm. When the input alternating current is cut off, the voltage of R7 becomes zero, the voltage of the base of Q1 is low level, the voltage of the C4 capacitor is rapidly discharged, and the M1 stops conducting. When the alternating current is started again, the actions are repeated, and the effect of preventing the impact current is achieved.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further, the current reduction circuit 10 further includes a rectifier bridge 103, where the rectifier bridge 103 includes four diodes, and the rectifier bridge 103 is configured to rectify the alternating current into direct current. The rectifier bridge 103 is also a very common device in the circuit, especially in the 220V power supply equipment, since 220V is alternating current, and the commonly used electronic device is weak current, the step-down rectification is required. The voltage rectified directly by the rectifier bridge 103 is not stable enough, and a filter circuit is needed to filter the rectified voltage to obtain a stable voltage.
The type selection of the rectifier bridge 103 is also important, and if the current of the rear stage is too large, the current of the rectifier bridge 103 is small, so that the rectifier bridge 103 is seriously scalded. If the cost is reduced, 4 diodes can be used to build the rectifier bridge 103, and the selection can be made according to the specific use scene.
Further, the current reduction circuit 10 further includes a second resistor 104 and a capacitor 105, and the second resistor 104 is connected in parallel with the capacitor 105.
Further, the resistance of the first resistor 101 is 20 ohms.
Further, the resistance of the second resistor 104 is a dummy resistance, and the value of the second resistor is represented by the formula P ═ U2The second resistor may be set as a computer or a liquid crystal television, and if the electric power of the computer or the liquid crystal television is 300W-500W, the formula P ═ U is substituted according to the electric power of the computer or the liquid crystal television of 500W2the/R calculation shows that the resistance of the second resistor is 180-300 ohms calculated according to the maximum voltage of 300V.
Further, the current reduction circuit 10 has a first terminal and a second terminal, the first terminal is an L pole, and the second terminal is an N pole.
The power supply device for reducing the switching on and switching off impact current is used as follows:
in use, an operator connects the first resistor 101 in parallel with the MOS transistor 102 and the second resistor 104 in parallel with the capacitor 105.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include more than one of the feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. A power supply device for reducing switching surge current, comprising:
the current reduction circuit comprises a first resistor and an MOS (metal oxide semiconductor) tube; the first resistor is connected with the MOS tube in parallel.
2. The power supply apparatus for reducing switching inrush current of claim 1, wherein the current reduction circuit further comprises a rectifier bridge, the rectifier bridge comprising four diodes, the rectifier bridge for rectifying the alternating current into the direct current.
3. The power supply apparatus for reducing switching inrush current of claim 1, wherein the current reduction circuit further comprises a second resistor and a capacitor, the second resistor and the capacitor being connected in parallel.
4. The power supply apparatus for reducing switching inrush current of claim 1, wherein the first resistor has a resistance of 20 ohms.
5. The power supply apparatus according to claim 3, wherein the resistance of the second resistor is a dummy resistance.
6. The power supply apparatus for reducing switching inrush current of claim 1, wherein the down current circuit has a first terminal and a second terminal, the first terminal being an L pole and the second terminal being an N pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120585661.0U CN214626792U (en) | 2021-03-23 | 2021-03-23 | Power supply device for reducing power on/off impact current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120585661.0U CN214626792U (en) | 2021-03-23 | 2021-03-23 | Power supply device for reducing power on/off impact current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214626792U true CN214626792U (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120585661.0U Active CN214626792U (en) | 2021-03-23 | 2021-03-23 | Power supply device for reducing power on/off impact current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214626792U (en) |
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2021
- 2021-03-23 CN CN202120585661.0U patent/CN214626792U/en active Active
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