CN217335113U - Power supply switching power supply circuit - Google Patents
Power supply switching power supply circuit Download PDFInfo
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- CN217335113U CN217335113U CN202123298668.3U CN202123298668U CN217335113U CN 217335113 U CN217335113 U CN 217335113U CN 202123298668 U CN202123298668 U CN 202123298668U CN 217335113 U CN217335113 U CN 217335113U
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Abstract
The utility model provides a power supply switching power supply circuit, power supply circuit includes: the power supply set is used for supplying power and comprises an external power supply, an internal battery and an external battery; the voltage detection sub-circuit is connected with the external power supply and is used for realizing voltage detection of the external power supply; an anti-reverse connection sub-circuit connected with the internal battery and the external battery and used for preventing current from being reversely connected; the switching sub-circuit is connected with the voltage sub-circuit and the reverse connection preventing sub-circuit and is used for realizing the switching of the power supply in the power supply pack; and the electronic circuit is connected with the switching sub-circuit and used for outputting current. The utility model provides a power supply switching power supply circuit can switch a plurality of powers and set for external power source's minimum input voltage value through the connection of different powers, switches in external power source and internal power source to be equipped with and prevent reverse connection circuit and can not be because of the short circuit of reversal connection in order to guarantee this power supply circuit.
Description
Technical Field
The utility model belongs to the technical field of supply circuit, concretely relates to power supply switching supply circuit.
Background
With the widespread use of portable electronic devices, the power supply requirements for portable electronic devices are increasing, and in general, portable electronic devices can be powered by an external power source or an internal power source. The voltages of different power supplies are different, and for portable electronic products, particularly portable oxygen generators, switching power supply among a plurality of power supplies with specific voltages is required. However, in practical application, the common circuit cannot identify the external power supply voltage, and particularly, the working state of the oxygen generator is abnormal when the external power supply voltage is too low.
Therefore, a power supply circuit capable of automatically identifying a power supply voltage and switching various power loads is needed to solve the problem that the conventional power supply circuit cannot identify an external voltage.
Disclosure of Invention
An object of the utility model is to solve above-mentioned problem, propose a power supply switching supply circuit that a plurality of powers provided the expected voltage to the load.
The utility model discloses an above-mentioned purpose is reached, a power supply switching supply circuit is provided, supply circuit includes:
the power supply set is used for supplying power and comprises an external power supply, an internal battery and an external battery;
the voltage detection sub-circuit is connected with the external power supply and is used for realizing voltage detection of the external power supply;
an anti-reverse connection sub-circuit connected with the internal battery and the external battery and used for preventing current from being reversely connected;
the switching sub-circuit is connected with the voltage sub-circuit and the reverse connection preventing sub-circuit and is used for realizing the switching of the power supply in the power supply pack; and
and the electronic circuit is connected with the switching sub-circuit and used for outputting current.
The utility model provides a power supply switching power supply circuit still has such characteristic, the voltage detection sub-circuit includes: a first resistor connected with an external power supply, a fourth resistor connected with the first resistor in series, a second resistor, a third resistor and a fifth resistor connected in series, a voltage reference device connected with the third resistor and the fifth resistor in parallel, and a voltage comparator for collecting and comparing the high-end voltage of the fourth resistor and the high-end voltage of the third resistor,
the fourth resistor is grounded, the second resistor is connected with an external power supply, the negative electrode of the voltage reference device is connected with the high end of the third resistor, the positive electrode of the voltage reference device is grounded, the pin 2 of the voltage reference device is connected between the third resistor and the fifth resistor, the fifth resistor is grounded, the pin 8 of the voltage comparator is connected with the external power supply, the pin 5 and the pin 6 of the voltage comparator are connected, and the pin 1 and the pin 4 of the voltage comparator are grounded.
The utility model provides a power supply switching power supply circuit still has such characteristic, prevent reverse sub-circuit including setting up the third diode in inside battery power export and setting up the fourth diode in outside battery power export.
The power supply switching power supply circuit provided by the utility model is also characterized in that the switching sub-circuit comprises a relay for switching the circuit and a first diode for discharging the redundant electric energy,
the high end and the normally open point of the electromagnetic coil of the relay are respectively connected with an external power supply, the low end of the electromagnetic coil of the relay is connected with a pin 7 of a voltage comparator in a voltage detection sub-circuit, the normally closed point of the relay is connected with an external battery and an internal battery, the output point of the relay is connected with an electronic circuit, the high end of the first diode is connected with the low end of the electromagnetic coil in the relay, and the low end of the first diode, the normally open point of the relay and the high end of the electromagnetic coil of the relay are simultaneously connected with a pin 8 of the voltage comparator.
The power supply switching power supply circuit provided by the utility model also has the characteristics that the electronic circuit comprises a fifth diode connected with the switching sub-circuit and a point-solving capacitor used for energy storage, the positive end of the fifth diode is connected with the switching sub-circuit, and the negative end outputs voltage; the negative end of the point-decomposition capacitor is grounded, and the positive end of the point-decomposition capacitor outputs voltage.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a power supply switching power supply circuit can switch a plurality of powers and set for external power source's minimum input voltage value through the connection of different powers, switches in external power source and internal power source to be equipped with and prevent reverse connection circuit and can not be because of the short circuit of reversal connection in order to guarantee this power supply circuit.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1: the embodiment of the utility model provides a power supply circuit's block diagram;
FIG. 2: the embodiment of the utility model provides a supply circuit's structure schematic diagram that provides.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the following embodiments are specifically illustrated in conjunction with the accompanying drawings.
In the description of the embodiments of the present invention, it should be understood that the terms "central," "longitudinal," "lateral," "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 the convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality" means two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; 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 creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1-2, there is provided a power supply switching power supply circuit, the power supply circuit comprising:
the power supply set is used for supplying power and comprises an external power supply, an internal battery and an external battery;
the voltage detection sub-circuit is connected with the external power supply and is used for realizing voltage detection of the external power supply;
an anti-reverse connection sub-circuit connected with the internal battery and the external battery for preventing reverse connection of current;
the switching sub-circuit is connected with the voltage sub-circuit and the reverse connection preventing sub-circuit and is used for realizing the switching of the power supply in the power supply pack; and
and the electronic circuit is connected with the switching sub-circuit and used for outputting current.
In some embodiments, the voltage detection subcircuit includes: a first resistor R1 connected with an external power supply, a fourth resistor R4 connected with the first resistor R1 in series, a second resistor R2, a third resistor R3 and a fifth resistor R5 connected with each other in series, a voltage reference device D2 connected with the third resistor R3 and the fifth resistor R5 in parallel, and a voltage comparator U1 used for collecting and comparing the voltage of the high end of the fourth resistor R4 and the voltage of the high end of the third resistor R3,
fourth resistance R4 ground connection second resistance R2 is connected with external power supply voltage reference D2's negative pole is connected with third resistance R3's high-end, voltage reference D2's anodal ground connection, voltage reference D2's pin 2 is connected between third resistance R3 and fifth resistance R5 fifth resistance R5 ground connection, voltage comparator U1's pin 8 is connected with external power supply, voltage comparator U2's pin 5 and pin 6 are connected, voltage comparator U2's pin 1 and pin 4 ground connection.
In some embodiments, the anti-reverse sub-circuit includes a third diode D3 disposed at the internal battery power outlet and a fourth diode D4 disposed at the external battery power outlet.
In some embodiments, the switching sub-circuit includes a relay K1 for switching the circuit and a first diode D1 for discharging excess power,
the high end and the normally open point of the electromagnetic coil of the relay K1 are respectively connected with an external power supply, the low end of the electromagnetic coil of the relay K1 is connected with a pin 7 of a voltage comparator U1 in a voltage detection sub-circuit, the normally closed point of the relay K1 is connected with an external battery and an internal battery, the output point of the relay K1 is connected with an electronic circuit, the high end of a first diode D1 is connected with the low end of the electromagnetic coil in a relay K1, and the low end of the first diode D1, the normally open point of the relay D1 and the high end of the electromagnetic coil of the relay D1 are simultaneously connected with a pin 8 of the voltage comparator U1.
In some embodiments, the electronic circuit comprises a fifth diode D5 connected with the switching sub-circuit and a point-to-break capacitor C1 for energy storage, wherein the positive terminal of the fifth diode D5 is connected with the switching sub-circuit, and the negative terminal outputs voltage; the negative end of the point-decomposing capacitor C1 is grounded, and the positive end outputs voltage.
The working principle of the above embodiment is as follows:
1. when the external power supply is connected, the circuit connected with the pins 2 and 3 of the voltage comparator analyzes the input voltage of the external power supply, when the voltage of the external power supply meets a set value, the voltage IN + is greater than IN-of the pins 2 and 3 of the voltage comparator UI, the output voltage of the pin 7 of the voltage comparator is 0V, the pins 1 and 2 of the relay K1 are conducted, the pin 3 of the K1 is connected with the pin 5, the external power supply is selected to supply power to a load, and the internal battery and the external battery are shielded.
2. When the voltage of the external power supply is lower than the set voltage value, namely IN + < IN-, the output voltage of the pin 7 of the voltage comparator U1 is equal to the voltage of the external power supply, the voltages of the pins 1 and 2 of the relay K1 are equal, and the internal battery or the external battery is selected to supply power to the load.
3. An external power supply and an external battery are connected with the circuit through different interfaces.
4. When the external battery is connected, because the diodes D3 and D4 exist, no current exists between the external battery and the internal battery, and mutual charging between the batteries is avoided.
5. An electrolytic capacitor C1 having a large capacitance value; when the power supply is switched, larger discharge current exists, and the smoothness of the current is ensured.
6. The diode D5 prevents the back electromotive voltage of the load from flowing into the voltage.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A power switching supply circuit, the supply circuit comprising:
the power supply set is used for supplying power and comprises an external power supply, an internal battery and an external battery;
the voltage detection sub-circuit is connected with the external power supply and is used for realizing voltage detection of the external power supply;
an anti-reverse connection sub-circuit connected with the internal battery and the external battery for preventing reverse connection of current;
the switching sub-circuit is connected with the voltage detection sub-circuit and the reverse connection prevention sub-circuit and is used for realizing the switching of the power supply in the power supply pack; and
and the electronic circuit is connected with the switching sub-circuit and used for outputting current.
2. The power-switching power supply circuit of claim 1, wherein the voltage detection subcircuit comprises: a first resistor connected with an external power supply, a fourth resistor connected with the first resistor in series, a second resistor, a third resistor and a fifth resistor connected in series, a voltage reference device connected with the third resistor and the fifth resistor in parallel, and a voltage comparator for collecting and comparing the high-end voltage of the fourth resistor and the high-end voltage of the third resistor,
the fourth resistor is grounded, the second resistor is connected with an external power supply, the negative electrode of the voltage reference device is connected with the high end of the third resistor, the positive electrode of the voltage reference device is grounded, the pin 2 of the voltage reference device is connected between the third resistor and the fifth resistor, the fifth resistor is grounded, the pin 8 of the voltage comparator is connected with the external power supply, the pin 5 and the pin 6 of the voltage comparator are connected, and the pin 1 and the pin 4 of the voltage comparator are grounded.
3. The power switching supply circuit of claim 1 wherein the reverse connection prevention sub-circuit comprises a third diode disposed at the internal battery power outlet and a fourth diode disposed at the external battery power outlet.
4. The power-switching supply circuit according to claim 1, wherein the switching sub-circuit includes a relay for performing circuit switching and a first diode for discharging excess power,
the high end and the normally open point of the electromagnetic coil of the relay are respectively connected with an external power supply, the low end of the electromagnetic coil of the relay is connected with a pin 7 of a voltage comparator in a voltage detection sub-circuit, the normally closed point of the relay is connected with an external battery and an internal battery, the output point of the relay is connected with an electronic circuit, the high end of the first diode is connected with the low end of the electromagnetic coil in the relay, and the low end of the first diode, the normally open point of the relay and the high end of the electromagnetic coil of the relay are simultaneously connected with a pin 8 of the voltage comparator.
5. The power supply switching power supply circuit according to claim 1, wherein the electronic circuit comprises a fifth diode and a point-to-point capacitor for energy storage, the fifth diode is connected with the switching sub-circuit at a positive end and outputs voltage at a negative end; the negative end of the point-decomposition capacitor is grounded, and the positive end outputs voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123298668.3U CN217335113U (en) | 2021-12-24 | 2021-12-24 | Power supply switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123298668.3U CN217335113U (en) | 2021-12-24 | 2021-12-24 | Power supply switching power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217335113U true CN217335113U (en) | 2022-08-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123298668.3U Active CN217335113U (en) | 2021-12-24 | 2021-12-24 | Power supply switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217335113U (en) |
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2021
- 2021-12-24 CN CN202123298668.3U patent/CN217335113U/en active Active
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