CN216851777U - Automatic voltage switching circuit and switching power supply - Google Patents
Automatic voltage switching circuit and switching power supply Download PDFInfo
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- CN216851777U CN216851777U CN202123028025.7U CN202123028025U CN216851777U CN 216851777 U CN216851777 U CN 216851777U CN 202123028025 U CN202123028025 U CN 202123028025U CN 216851777 U CN216851777 U CN 216851777U
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Abstract
The utility model belongs to the technical field of the power, especially, relate to a voltage automatic transfer switch circuit and switching power supply, including AC input circuit and mains operated circuit, still include: a voltage input detection circuit connected to the AC input circuit; the main control circuit is connected with the power supply circuit and the voltage input detection circuit; and the rectification switching circuit is connected with the alternating current input circuit, the power supply circuit and the main control circuit and is used for switching to bridge rectification when the main control circuit sends a first electric signal and switching to voltage-doubling rectification when the main control circuit sends a second electric signal. The utility model discloses can carry out the mode switch of bridge type rectification and voltage doubling rectification according to AC input's voltage size, and then avoid the fried quick-witted problem that the high pressure leads to, indirectly promote the product live time, greatly promote the security performance of power.
Description
Technical Field
The utility model belongs to the technical field of the power, especially, relate to a voltage automatic transfer switch circuit and switching power supply.
Background
A switching power supply, which is a high-frequency power conversion device, is a power supply, and functions to convert a level voltage into a voltage or current required by a user terminal through different types of architectures. The input of the switching power supply is mostly an ac power supply, and the output is mostly an apparatus requiring a dc power supply, such as a personal computer, and the switching power supply performs voltage and current conversion between the two.
At present, switching power supply on the market is various, but traditional switching power supply is because of structural design's limitation, takes place fried machine problem when leading to input voltage to change easily, and then leads to the product to damage on the one hand, and on the other hand leads to the not high problem of security.
Therefore, it is necessary to design an automatic voltage switching circuit and a switching power supply.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a voltage automatic transfer switch circuit and switching power supply aims at solving the not high technical problem of switching power supply security among the prior art.
In order to achieve the above object, an embodiment of the present invention provides a voltage automatic transfer switch circuit, including ac input circuit and power supply circuit, ac input circuit's input is used for connecting the commercial power, power supply circuit with ac input circuit's output is connected, still includes:
the voltage input detection circuit is connected with the alternating current input circuit and is used for detecting the input voltage output by the alternating current input circuit;
the main control circuit is connected with the power supply circuit and the voltage input detection circuit and is used for generating a first electric signal when the input voltage is greater than a preset voltage and generating a second electric signal when the input voltage is less than or equal to the preset voltage;
and the rectification switching circuit is connected with the alternating current input circuit, the power supply circuit and the main control circuit and is used for switching to bridge rectification when the main control circuit sends a first electric signal and switching to voltage-doubling rectification when the main control circuit sends a second electric signal.
Optionally, the main control circuit includes a main control chip U2, and the main control chip U2 is connected to the power supply circuit, the voltage input detection circuit, and the rectification switching circuit.
Optionally, the rectification switching circuit includes a first switching tube Q1, a RELAY1, a rectifier bridge BD, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2 and a rectification output connection terminal + HV, a first end of the first switching tube Q1 is connected to a third pin of the main control chip U2, the RELAY1 is connected to a second end of the first switching tube Q1, the RELAY1 is further connected to the power supply circuit, the rectifier bridge BD is connected to the ac input circuit, the rectifier bridge BD is further connected to the RELAY1, one end of the first electrolytic capacitor EC1 is connected to the rectifier bridge BD, the second electrolytic capacitor EC2 is connected to the first electrolytic capacitor EC1, and the rectification output connection terminal + HV is connected to the rectifier bridge BD and the first electrolytic capacitor EC 1.
Optionally, the first switching tube Q1 is a triode, the first terminal of the first switching tube Q1 is a base of the triode, the second terminal of the first switching tube Q1 is a collector of the triode, and the third terminal of the first switching tube Q1 is an emission set.
Optionally, the alternating current input circuit includes a live wire input end AC _ L, a zero line input end AC _ N, and a fourth electrolytic capacitor C4, where the live wire input end AC _ L is connected to the voltage input detection circuit and the rectifier bridge BD, the zero line input end AC _ N is connected to the rectifier bridge BD, and two ends of the fourth electrolytic capacitor C4 are connected to the live wire input end AC _ L and the zero line input end AC _ N, respectively.
Optionally, the voltage input detection circuit includes a third detection resistor R3, a fourth detection resistor R4 and a fifth detection resistor R5, the third detection resistor R3 is connected to the live wire input AC _ L, the fourth detection resistor R4 is connected to the third detection resistor R3, one end of the fifth detection resistor R5 is connected to the fourth detection resistor R4, the other end of the fifth detection resistor R5 is grounded, and the fourth detection resistor R4 and the fifth detection resistor R5 are also connected to the fourth pin of the main control chip U2.
Optionally, the power supply circuit includes power chip U1 and power supply output terminal +5V, the fifth pin of power chip U1 connect after a sixth resistance R6 with live wire input AC _ L connects, the first pin of power chip U1 connect after a seventh resistance R7 with power supply output terminal +5V connects, the second pin of power chip U1 connect after a first inductance L1 with power supply output terminal +5V connects, the third pin of power chip U1 connect after a second diode D2 with first inductance L1 with power supply output terminal +5V all connects.
Optionally, the second pin of the power chip U1 is grounded after being connected to an eighth capacitor C8.
Optionally, the third pin of the power chip U1 is connected to a ninth capacitor C9 and then grounded.
The embodiment of the utility model provides an above-mentioned one or more technical scheme in voltage automatic transfer switch circuit and the switching power supply have one of following technological effect at least:
the utility model supplies power to the main control circuit and the rectification switching circuit through the power supply circuit, and detects the input voltage output by the AC input circuit through the voltage input detection circuit, and transmitting the input voltage to the main control circuit, the main control circuit generating a first electrical signal when the input voltage is greater than a preset voltage, and sending to the rectification switching circuit, which is switched to bridge rectification, the main control circuit generates a second electrical signal when the input voltage is less than or equal to a preset voltage and sends the second electrical signal to the rectification switching circuit, which is switched to voltage-doubling rectification, thereby realizing the mode switching of bridge rectification and voltage-doubling rectification according to the voltage of the AC input, and then avoid the fried machine problem that the high pressure leads to, the indirect product live time that promotes greatly promotes the security performance of power.
In order to achieve the above object, an embodiment of the present invention provides a switching power supply, including the above voltage automatic transfer switching circuit.
The embodiment of the utility model provides an above-mentioned one or more technical scheme in the switching power supply have one of following technological effect at least:
switching power supply includes foretell voltage automatic switch-over switch circuit, so switching power supply also can realize carrying out the mode switch of bridge type rectification and voltage doubling rectification according to the voltage size of AC input, and then avoids the machine problem of exploding that the high pressure leads to, promotes the product live time indirectly, greatly promotes the security performance of power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of an automatic voltage switching circuit according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
100. an AC input circuit; 200. a power supply circuit; 300. a voltage input detection circuit; 400. a master control circuit; 500. a rectification switching circuit.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the embodiments of the present invention and are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the 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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
In an embodiment of the present invention, as shown in fig. 1, there is provided a voltage automatic switching circuit, which includes an ac input circuit 100 and a power supply circuit 200, wherein an input end of the ac input circuit 100 is used for connecting a commercial power, and the power supply circuit is connected to an output end of the ac input circuit 100.
The automatic voltage switching circuit further includes a voltage input detection circuit 300, a main control circuit 400 and a rectification switching circuit 500.
The voltage input detection circuit 300 is connected to the ac input circuit 100, and is configured to detect an input voltage output by the ac input circuit 100; the main control circuit 400 is connected to both the power supply circuit 200 and the voltage input detection circuit and is configured to generate a first electrical signal when the input voltage is greater than a preset voltage, where the preset voltage is preset. The main control circuit 400 generates a second electrical signal when the input voltage is less than or equal to the preset voltage; the rectification switching circuit 500 is connected to the ac input circuit 100, the power supply circuit 200, and the main control circuit 400, and is configured to switch to bridge rectification when the main control circuit 400 sends a first electrical signal, and switch to voltage-doubling rectification when the main control circuit 400 sends a second electrical signal.
The utility model supplies power to the main control circuit 400 and the rectification switching circuit 500 through the power supply circuit 200, detects the input voltage output by the AC input circuit 100 through the voltage input detection circuit 300, and transmits the input voltage to the main control circuit 400, the main control circuit 400 generates a first electric signal when the input voltage is greater than a preset voltage and transmits the first electric signal to the rectification switching circuit 500, the rectification switching circuit 500 is switched into bridge rectification, the main control circuit 400 generates a second electric signal when the input voltage is less than or equal to the preset voltage and transmits the second electric signal to the rectification switching circuit 500, the rectification switching circuit 500 is switched into voltage doubling rectification, and further the mode switching of bridge rectification and voltage doubling rectification can be carried out according to the voltage of AC input, thereby avoiding the problem of explosion caused by high voltage and indirectly improving the service life of products, greatly improving the safety performance of the power supply.
In an embodiment of the present invention, as shown in fig. 1, the main control circuit 400 includes a main control chip U2, the main control chip U2 is connected to the power supply circuit 200, the voltage input detection circuit 300 and the rectification switching circuit 500. In this embodiment, the model of the main control chip U2 is preferably FT60F 210-URT.
In an embodiment of the present invention, as shown in fig. 1, the rectification switching circuit 500 includes a first switching tube Q1, a RELAY1, a rectifier bridge BD, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, and a rectification output connection terminal + HV.
The first end of the first switch tube Q1 is connected with the third pin of the main control chip U2, the RELAY1 is connected with the second end of the first switch tube Q1, the RELAY1 is further connected with the power supply circuit 200, the rectifier bridge BD is connected with the ac input circuit 100, the rectifier bridge BD is further connected with the RELAY1, one end of the first electrolytic capacitor EC1 is connected with the rectifier bridge BD, the second electrolytic capacitor EC2 is connected with the first electrolytic capacitor EC1, and the rectification output connection end + HV is connected with the rectifier bridge BD and the first electrolytic capacitor EC 1.
In this embodiment, the first switch tube Q1 is a triode, the first end of the first switch tube Q1 is a base of the triode, the second end of the first switch tube Q1 is a collector of the triode, and the third end of the first switch tube Q1 is an emission set.
The operation principle of the rectification switching circuit 500 is as follows:
firstly, the main control circuit 400 detects the input voltage output by the ac input circuit 100 through the voltage input detection circuit 300, then, the main control circuit 400 compares the input voltage with a preset voltage, when the input voltage is judged to be greater than the preset voltage, the main control circuit 400 generates a first electrical signal and sends the first electrical signal to the first switch tube Q1 in the rectification switching circuit 500, and controls the conduction of the third pin and the fifth pin of the RELAY1 based on the first switch tube Q1, at this time, the switching is performed to the bridge rectification mode.
When the main control circuit 400 determines that the input voltage is less than or equal to the preset voltage, a second electrical signal is generated and sent to the first switching tube Q1 to control the conduction of the third pin and the fourth pin of the RELAY1, and at this time, the switching is a voltage-doubling rectification mode.
So, through the difference according to input voltage, select different rectification modes, when high pressure, switch into bridge rectifier, when the low pressure, switch into voltage doubling rectification, and then effectively avoid exploding the machine, promote the security in product security performance and the product use.
In an embodiment of the present invention, as shown in fig. 1, the AC input circuit 100 includes a live wire input terminal AC _ L, a zero wire input terminal AC _ N and a fourth electrolytic capacitor C4, the live wire input terminal AC _ L and the voltage input detection circuit 300 and the rectifier bridge BD are connected, the zero wire input terminal AC _ N and the rectifier bridge BD are connected, the two ends of the fourth electrolytic capacitor C4 are connected to the live wire input terminal AC _ L and the zero wire input terminal AC _ N, respectively. The voltage range input by the live wire input end AC _ L is 100VAC-120VAC or 200VAC-240 VAC.
In an embodiment of the present invention, as shown in fig. 1, the voltage input detection circuit 300 includes a third detection resistor R3, a fourth detection resistor R4 and a fifth detection resistor R5, the third detection resistor R3 is connected to the live wire input AC _ L, the fourth detection resistor R4 is connected to the third detection resistor R3, one end of the fifth detection resistor R5 is connected to the fourth detection resistor R4, the other end of the fifth detection resistor R5 is grounded, the fourth detection resistor R4 is connected to the fifth detection resistor R5, and the fifth detection resistor R5 is also connected to the fourth pin of the main control chip U2. The alternating current input through the live wire input end AC _ L sequentially passes through the third detection resistor R3, the fourth detection resistor R4 and the fifth detection resistor R5 and then is grounded, and the fourth pin of the main control chip U2 is connected between the fourth detection resistor R4 and the fifth detection resistor R5 to acquire voltage and further acquire input voltage.
In an embodiment of the present invention, as shown in fig. 1, the power supply circuit 200 includes a power chip U1 and a power output terminal +5V, the fifth pin of the power chip U1 is connected to a sixth resistor R6 and then connected to the live wire input terminal AC _ L, the first pin of the power chip U1 is connected to a seventh resistor R7 and then connected to the power output terminal +5V, the second pin of the power chip U1 is connected to a first inductor L1 and then connected to the power output terminal +5V, and the third pin of the power chip U1 is connected to a second diode D2 and then connected to the first inductor L1 and the power output terminal + 5V. The commercial power is through live wire input end AC _ L, sixth resistance R6 after input extremely power chip U1, warp power chip U1's conversion output extremely power output end +5V, warp power output end +5V output +5V voltage.
The power supply output end +5V is connected with a fifth pin of the main control chip U2, the power supply output end +5V is further connected with the RELAY RELAY1, and stable working voltage is provided for the main control chip U2 and the RELAY RELAY1 through the power supply output end +5V, so that the stability of the whole circuit structure is improved.
In this embodiment, the model number of the power chip U1 is preferably FT 8400.
The second pin of the power chip U1 is connected to an eighth capacitor C8 and then grounded.
The third pin of the power chip U1 is connected to a ninth capacitor C9 and then grounded. Through setting up eighth electric capacity C8 with ninth electric capacity C9 realizes filtering, promotes the stability of whole circuit structure.
In another embodiment of the present invention, a switching power supply is provided, which includes the above-mentioned automatic voltage switching circuit.
Switching power supply includes foretell voltage automatic switch-over switch circuit, so switching power supply also can realize carrying out the mode switch of bridge type rectification and voltage doubling rectification according to the voltage size of AC input, and then avoids the machine problem of exploding that the high pressure leads to, promotes the product live time indirectly, greatly promotes the security performance of power.
It should be noted that, as for the control part, it is a mature and formed technology in the prior art, a person skilled in the art should consult corresponding programming control data by himself or select other types of chips and consult corresponding programming control data as required according to the chip signals provided in the present application to perform related control, for example, different preset voltages may be set as required, and the main control chip is set to generate the first electrical signal or the second electrical signal according to the preset voltage and the input voltage.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a voltage automatic transfer switch circuit, includes AC input circuit and power supply circuit, AC input circuit's input is used for connecting the commercial power, power supply circuit with AC input circuit's output is connected, its characterized in that still includes:
the voltage input detection circuit is connected with the alternating current input circuit and is used for detecting the input voltage output by the alternating current input circuit;
the main control circuit is connected with the power supply circuit and the voltage input detection circuit and is used for generating a first electric signal when the input voltage is greater than a preset voltage and generating a second electric signal when the input voltage is less than or equal to the preset voltage;
and the rectification switching circuit is connected with the alternating current input circuit, the power supply circuit and the main control circuit and is used for switching to bridge rectification when the main control circuit sends a first electric signal and switching to voltage-doubling rectification when the main control circuit sends a second electric signal.
2. The automatic voltage switching circuit of claim 1, wherein the master control circuit comprises a master control chip U2, and the master control chip U2 is connected to the power supply circuit, the voltage input detection circuit and the rectification switching circuit.
3. The automatic voltage switching circuit according to claim 2, wherein the rectification switching circuit comprises a first switching tube Q1, a RELAY RELAY1, a rectifier bridge BD, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2 and a rectification output connection terminal + HV, the first end of the first switch tube Q1 is connected with the third pin of the main control chip U2, the RELAY RELAY1 is connected with the second end of the first switch tube Q1, the RELAY RELAY1 is also connected with the power supply circuit, the rectifier bridge BD is connected with the alternating current input circuit, the rectifier bridge BD is also connected with the RELAY RELAY1, one end of the first electrolytic capacitor EC1 is connected with the rectifier bridge BD, the second electrolytic capacitor EC2 is connected with the first electrolytic capacitor EC1, and the rectification output connection terminal + HV is connected with the rectifier bridge BD and the first electrolytic capacitor EC 1.
4. The automatic voltage switching circuit according to claim 3, wherein the first switch transistor Q1 is a triode, the first terminal of the first switch transistor Q1 is a base of the triode, the second terminal of the first switch transistor Q1 is a collector of the triode, and the third terminal of the first switch transistor Q1 is an emitter.
5. The automatic voltage switcher circuit of claim 3, wherein the AC input circuit comprises a live input AC _ L, a neutral input AC _ N and a fourth electrolytic capacitor C4, the live input AC _ L is connected to the voltage input detection circuit and the rectifier bridge BD, the neutral input AC _ N is connected to the rectifier bridge BD, and two ends of the fourth electrolytic capacitor C4 are connected to the live input AC _ L and the neutral input AC _ N, respectively.
6. The automatic voltage switcher circuit of claim 5, wherein the voltage input detection circuit comprises a third detection resistor R3, a fourth detection resistor R4 and a fifth detection resistor R5, the third detection resistor R3 is connected to the live line input terminal AC _ L, the fourth detection resistor R4 is connected to the third detection resistor R3, one end of the fifth detection resistor R5 is connected to the fourth detection resistor R4, the other end of the fifth detection resistor R5 is grounded, and the fourth detection resistor R4 and the fifth detection resistor R5 are both connected to the fourth pin of the main control chip U2.
7. The automatic voltage transfer switch circuit of claim 6, wherein the power supply circuit comprises a power chip U1 and a power output terminal +5V, a fifth pin of the power chip U1 is connected to a sixth resistor R6 and then connected to the live line input terminal AC _ L, a first pin of the power chip U1 is connected to a seventh resistor R7 and then connected to the power output terminal +5V, a second pin of the power chip U1 is connected to a first inductor L1 and then connected to the power output terminal +5V, and a third pin of the power chip U1 is connected to a second diode D2 and then connected to both the first inductor L1 and the power output terminal + 5V.
8. The automatic voltage switch circuit of claim 7, wherein the second pin of the power chip U1 is connected to an eighth capacitor C8 and then to ground.
9. The automatic voltage switch circuit of claim 7, wherein the third pin of the power chip U1 is connected to a ninth capacitor C9 and then to ground.
10. A switching power supply, characterized in that it comprises an automatic voltage changeover switching circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123028025.7U CN216851777U (en) | 2021-12-03 | 2021-12-03 | Automatic voltage switching circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123028025.7U CN216851777U (en) | 2021-12-03 | 2021-12-03 | Automatic voltage switching circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216851777U true CN216851777U (en) | 2022-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123028025.7U Active CN216851777U (en) | 2021-12-03 | 2021-12-03 | Automatic voltage switching circuit and switching power supply |
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| Country | Link |
|---|---|
| CN (1) | CN216851777U (en) |
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2021
- 2021-12-03 CN CN202123028025.7U patent/CN216851777U/en active Active
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