Uninterruptible power supply control circuit

Abstract

The utility model discloses an uninterruptible power control circuit. The uninterruptible power control circuit comprises a first positive connecting end, a first negative connecting end, a second positive connecting end and a second negative connecting end, wherein the first positive connecting end and the first negative connecting end are used for connecting a switching power supply and an electricity load; the second positive connecting end and the second negative connecting end are used for connecting an electric load; the uninterruptible power control circuit further comprises a battery, an anti-reverse circuit, a first switch tube and a second switch tube, and the first switch tube and the second switch tube jointly achieve power supply switching. According to the uninterruptible power control circuit, the used elements and the circuit structure are simple, and miniaturization of the uninterruptible power control circuit is realized.

Description

Technical Field

[0001] This utility model relates to the field of power switching technology, and in particular to an uninterrupted power control circuit. Background Technology

[0002] Current power switching technology typically employs complex circuits composed of processors and various components to achieve automatic power switching. Therefore, existing uninterruptible power control circuits suffer from complex circuit structures and are difficult to miniaturize. Utility Model Content

[0003] This utility model provides an uninterruptible power control circuit to solve the problem that existing uninterruptible power control circuits use complex components and circuit structures, making them difficult to miniaturize.

[0004] An uninterruptible power supply (UPS) control circuit includes a first positive connection terminal, a first negative connection terminal, a second positive connection terminal, and a second negative connection terminal. The first positive connection terminal and the first negative connection terminal are used to connect a switching power supply and an electrical load. The second positive connection terminal and the second negative connection terminal are used to connect the electrical load.

[0005] The uninterruptible power control circuit also includes a battery, an anti-reverse circuit, a first switching transistor, and a second switching transistor.

[0006] The first terminal of the anti-reverse circuit is connected to the first positive connection terminal and the control terminal of the first switch transistor. The second terminal of the anti-reverse circuit is connected to the positive terminal of the battery, the first terminal of the first switch transistor, the first terminal of the second switch transistor, and the control terminal of the second switch transistor. The negative terminal of the battery is connected to the first negative connection terminal, the second negative connection terminal, and the second terminal of the first switch transistor.

[0007] The second terminal of the second switch is connected to the second positive terminal, and the second terminal of the first switch is connected to the second negative terminal.

[0008] Preferably, it further includes a first resistor and a second resistor;

[0009] The first end of the first resistor is connected to the first positive connection terminal of the uninterrupted power control circuit and the first end of the anti-reverse circuit, and the second end of the first resistor is connected to the control terminal of the first switching transistor.

[0010] The first end of the second resistor is connected to the second end of the anti-reverse circuit, the positive terminal of the battery, and the first connection end of the second switch. The second end of the second resistor is connected to the first connection end of the first switch and the control end of the second switch.

[0011] Preferably, the first switching transistor is a transistor or a MOSFET; the first terminal of the first switching transistor is the collector of the transistor or the drain of the MOSFET, the second terminal of the first switching transistor is the emitter of the transistor or the source of the MOSFET, and the control terminal of the first switching transistor is the base of the transistor or the gate of the MOSFET.

[0012] Preferably, the second switching transistor is a transistor or a MOSFET; the first terminal of the second switching transistor is the collector of the transistor or the drain of the MOSFET, the second terminal of the second switching transistor is the emitter of the transistor or the source of the MOSFET, and the control terminal of the second switching transistor is the base of the transistor or the gate of the MOSFET.

[0013] Preferably, the anti-reverse circuit includes a first diode, with the first terminal of the anti-reverse circuit being the positive terminal of the first diode and the second terminal being the negative terminal of the first diode.

[0014] Preferably, the uninterruptible power control circuit further includes a third resistor, the first end of which is connected to the first positive connection terminal, and the second end of which is connected to the first negative connection terminal.

[0015] Preferably, the two input terminals of the switching power supply are used to connect to the mains power, and the two output terminals of the switching power supply are respectively connected to the first positive connection terminal and the first negative connection terminal of the uninterruptible power control circuit.

[0016] Preferably, the switching power supply includes a transformer circuit, a rectifier circuit, and a filter circuit;

[0017] The two input terminals of the transformer circuit are connected to the mains power, the first output terminal is connected to the first terminal of the rectifier circuit, and the second output terminal is connected to the first negative connection terminal and the second terminal of the filter circuit.

[0018] The second terminal of the rectifier circuit is connected to the first positive connection terminal and to the first terminal of the filter circuit.

[0019] Preferably, the rectifier circuit includes a second diode, the first terminal of the rectifier circuit is the positive terminal of the second diode, and the first terminal of the rectifier circuit is the negative terminal of the second diode.

[0020] Preferably, the filter circuit includes a capacitor.

[0021] In the aforementioned uninterruptible power supply (UPS) circuit, when the switching power supply is on, the switching power supply controls the first switching transistor to conduct, and the conduction of the first switching transistor controls the second switching transistor to deactivate. At this time, external power can supply power, but the battery cannot. When external power cannot supply power, the first switching transistor deactivates, and the second switching transistor conducts. At this time, the battery provides power, and the reverse current protection circuit controls the unidirectional current flow. The components and overall structure of the entire UPS are simple, allowing for miniaturization. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a block diagram of a non-disconnect power control circuit in one embodiment of the present invention;

[0024] Figure 2 This is a circuit diagram of an uninterruptible power control circuit in one embodiment of the present invention;

[0025] Figure 3 This is another circuit diagram of the uninterruptible power control circuit in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the third type of uninterruptible power control circuit in one embodiment of this utility model;

[0027] In the diagram: P1+, first positive connection terminal; P1-, first negative connection terminal; P2+, second positive connection terminal; P2-, second negative connection terminal; 1, battery; 2, anti-reverse circuit; Q1, first switching transistor; Q2, second switching transistor; D1, first transistor; 3, switching power supply; T, transformer; D2, rectifier circuit; C, filter circuit. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0031] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0032] This utility model embodiment provides an uninterrupted power control circuit, such as... Figure 1 As shown, the uninterruptible power supply control circuit includes a first positive connection terminal P1+, a first negative connection terminal P1-, a second positive connection terminal P2+, and a second negative connection terminal P2-. The first positive connection terminal P1+ and the first negative connection terminal P1- are used to connect the switching power supply and the electrical load; the second positive connection terminal P2+ and the second negative connection terminal P2- are used to connect the electrical load.

[0033] The uninterruptible power control circuit also includes a battery 1, an anti-reverse circuit 2, a first switch Q1, and a second switch Q2;

[0034] The first terminal of the anti-reverse circuit 2 is connected to the first positive connection terminal P1+ and the control terminal of the first switch Q1. The second terminal of the anti-reverse circuit 2 is connected to the positive terminal of the battery 1, the first terminal of the first switch Q1, the first terminal of the second switch Q2 and the control terminal of the second switch Q2. The negative terminal of the battery 1 is connected to the first negative connection terminal P1-, the second negative connection terminal P2- and the second terminal of the first switch Q1.

[0035] The second terminal of the second switch Q2 is connected to the second positive terminal P2+, and the second terminal of the first switch Q1 is connected to the second negative terminal P2-.

[0036] In the Figure 1In the circuit, the first positive connection terminal P1+ and the first negative connection terminal P1- of the uninterruptible power control circuit are used to connect the switching power supply 3 and the electrical load. Therefore, under normal circumstances, the switching power supply 3 can directly supply power to the electrical load. Generally, the first negative connection terminal P1- also needs to be grounded. The reverse protection circuit 2 is used to ensure that the battery 1 cannot supply power to the electrical load through the first positive connection terminal P1+ and the first negative connection terminal P1-. Generally, the reverse protection circuit 2 can be replaced by a simple diode, or other complex circuits can be used, which will not be described in detail here. The uninterruptible power supply (UPS) circuit controls the on / off state of the first switching transistor Q1 via the switching power supply 3. The on / off state of the first switching transistor Q1 further controls the on / off state of the second switching transistor Q2. Therefore, the first terminal of the first switching transistor Q1 must be connected to the control terminal of the second switching transistor Q2. When the switching power supply 3 is normally supplying power to the load, the first switching transistor Q1 is in the on state, and the second switching transistor Q2 is in the off state. At this time, the battery 1 cannot supply power to the load. When the switching power supply 3 malfunctions and cannot supply power to the load, the first switching transistor Q1 is in the off state, and the second switching transistor Q2 is in the on state. At this time, the battery 1 can directly supply power to the load through the second positive connection terminal P2+ and the second negative connection terminal P2-, thus realizing the switching between the switching power supply 3 and the battery 1. The first positive connection terminal P1+ and the second positive connection terminal P2+ are connected to the positive terminal of the load, and the first negative connection terminal P1- and the second negative connection terminal P2- are connected to the negative terminal of the load. In addition, the battery 1 can generally be a storage battery or a regular battery. When the battery 1 is a storage battery, it can also be charged when the switching power supply is normally supplying power to the electrical load.

[0037] In some embodiments, the uninterruptible power control circuit further includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected to the first positive connection terminal P1+ and the first end of the anti-reverse circuit 2, and the second end of the first resistor R1 is connected to the control terminal of the first switch Q1; the first end of the second resistor R2 is connected to the second end of the anti-reverse circuit 2, the positive terminal of the battery 1, and the first connection terminal of the second switch Q2, and the second end of the second resistor R2 is connected to the first connection terminal of the first switch Q1 and the control terminal of the second switch Q2.

[0038] The first resistor R1 and the second resistor R2 are used to provide bias current or bias voltage to the first switch Q1 and the second switch Q2 to ensure that the first switch Q1 and the second switch Q2 can work normally.

[0039] In some embodiments, the first switch Q1 is a transistor or a MOSFET; the first terminal of the first switch Q1 is the collector of the transistor or the drain of the MOSFET, the second terminal of the first switch Q1 is the emitter of the transistor or the source of the MOSFET, and the control terminal of the first switch Q1 is the base of the transistor or the gate of the MOSFET.

[0040] In some embodiments, the second switch Q2 is also a transistor or a MOSFET; the first terminal of the second switch Q2 is the collector of the transistor or the drain of the MOSFET, the second terminal of the second switch Q2 is the emitter of the transistor or the source of the MOSFET, and the control terminal of the second switch Q2 is the base of the transistor or the gate of the MOSFET.

[0041] Since the voltage supplied by the switching power supply 3 connected to the uninterruptible power supply control circuit may fluctuate, in some embodiments, a third resistor R3 needs to be connected between the first positive connection terminal P1+ and the first negative connection terminal P1- of the uninterruptible power supply control circuit. The third resistor R3 acts as a dummy load, stabilizing the output voltage on one hand, and discharging residual voltage in the circuit when the switching power supply 3 is de-energized on the other. The resistance value of the third resistor R3 should generally be determined based on the electrical load; it should not be too large or too small.

[0042] In one embodiment, such as Figure 2 As shown, in this uninterruptible power control circuit, the first switching transistor Q1 is a transistor, the second switching transistor Q2 is an N-channel MOSFET, and the anti-reverse circuit 2 is the first diode D1. The first positive terminal P1+ is connected to the anode of the first diode D1, one end of the first resistor R1, and one end of the third resistor R3. The cathode of the diode D2 is connected to the anode of the battery 1, one end of the second resistor R2, and the drain of the N-channel MOSFET Q2. The base of the transistor Q1 is connected to the other end of the first resistor R1. The collector of the transistor Q1 is connected to the gate of the N-channel MOSFET Q2 and the other end of the second resistor R2. The emitter of the transistor Q1 is connected to the cathode of the battery 1, the first negative terminal P1-, the other end of the third resistor R3, and the second negative terminal P2-. The source of the N-channel MOSFET Q2 is connected to the second positive terminal P2+.

[0043] exist Figure 2 In the uninterruptible power control circuit shown, the third resistor R3 is a dummy load used to stabilize the output voltage of the switching power supply 3.

[0044] The switching power supply 3 controls the on / off state of the transistor Q1, which in turn controls the on / off state of the N-channel MOSFET Q2. When the N-channel MOSFET Q2 is turned on, the battery 1 supplies power to the electrical load.

[0045] Specifically, when the switching power supply 3 is supplying power normally, the electrical load operates normally. At the same time, the switching power supply 3 charges the battery 1 through diode D1. In addition, the current of the switching power supply 3 flows to the base of transistor Q1 through the first resistor R1. At this time, transistor Q1 starts to conduct, making the gate voltage of N-channel MOSFET Q2 low level. The gate-source voltage is less than the threshold, so N-channel MOSFET Q2 is turned off, thus causing battery 1 to be unable to supply power to the electrical load. When the switching power supply 3 is unable to supply power normally, no current flows to the base of transistor Q1, so transistor Q1 is turned off. Battery 1, through the second resistor R2, makes the gate-source voltage of N-channel MOSFET Q2 greater than the threshold, thus causing N-channel MOSFET Q2 to conduct. The positive terminal of battery 1 is directly connected to the second positive connection terminal P2+, and the negative terminal is connected to the second negative connection terminal P2-, realizing that battery 1 supplies power to the electrical load. That is, it realizes timely switching of battery 1 to supply power to the electrical load when the switching power supply 3 is unable to supply power.

[0046] In one embodiment, the second switch Q2 can also be replaced by a transistor, such as... Figure 3 As shown, when the switching power supply 3 is supplying power normally, the electrical load is working normally. At the same time, the switching power supply 3 charges the battery 1 through the first diode D1. In addition, the current of the switching power supply 3 flows to the base of the transistor Q1 through the first resistor R1. At this time, the transistor Q1 starts to conduct. At this time, no current flows to the base of the transistor Q2, so the transistor Q2 is turned off, thus causing the battery 1 to be unable to supply power to the electrical load. When the switching power supply 3 is unable to supply power normally, no current flows to the base of the transistor Q1, so the transistor Q1 is turned off. The battery 1 provides current to the base of the transistor Q2 through the second resistor R2, thus causing the transistor Q2 to conduct. The positive terminal of the battery 1 is directly connected to the second positive connection terminal P2+, and the negative terminal is connected to the second negative connection terminal P2-, realizing that the battery 1 supplies power to the electrical load. That is, it realizes the timely switching of the battery 1 to supply power to the electrical load when the switching power supply 3 is unable to supply power.

[0047] In other embodiments, the first switching transistor Q1 can be either a transistor or a field-effect transistor. Both solutions can achieve the same function, and will not be elaborated further here.

[0048] The uninterruptible power supply (UPS) control circuit provided in this embodiment includes a first positive connection terminal P1+, a first negative connection terminal P1-, a second positive connection terminal P2+, and a second negative connection terminal P2-. The first positive connection terminal P1+ and the first negative connection terminal P1- are used to connect the switching power supply 3 and the electrical load; the second positive connection terminal P2+ and the second negative connection terminal P2- are used to connect the electrical load. The UPS control circuit also includes a battery 1, a reverse polarity protection circuit 2, a first switching transistor Q1, and a second switching transistor Q2. The first switching transistor Q1 and the second switching transistor Q2 together realize power switching. This UPS control circuit uses simple components and has a simple circuit structure, achieving miniaturization of the UPS control circuit.

[0049] In one embodiment, the anti-reverse circuit 2 includes a first diode D1, with the first terminal of the anti-reverse circuit being the positive terminal of the first diode D1 and the second terminal being the negative terminal of the first diode D2.

[0050] In one embodiment, the uninterruptible power control circuit further includes a third resistor R3, the first end of which is connected to the first positive connection terminal P1+, and the second end of which is connected to the first negative connection terminal P1-.

[0051] In one embodiment, in the uninterruptible power supply control circuit, the two input terminals of the switching power supply 3 are used to connect to the mains power, and the two output terminals of the switching power supply 3 are respectively connected to the first positive connection terminal P1+ and the first negative connection terminal P1- of the uninterruptible power supply control circuit.

[0052] In some embodiments, the switching power supply 3 includes a transformer circuit T, a rectifier circuit D2, and a filter circuit C; the two input terminals of the transformer circuit T are connected to the mains power, the first output terminal is connected to the first terminal of the rectifier circuit D2, and the second output terminal is connected to the first negative connection terminal P1- of the uninterruptible power control circuit and the second terminal of the filter circuit C; the second terminal of the rectifier circuit C is connected to the first positive connection terminal P1+ of the uninterruptible power control circuit and the first terminal of the filter circuit C.

[0053] In one embodiment, the rectifier circuit D2 includes a second diode, with a first terminal of the rectifier circuit D2 being the positive terminal of the second diode and a second terminal of the rectifier circuit D2 being the negative terminal of the second diode.

[0054] In one embodiment, the filter circuit C can generally be a capacitor.

[0055] like Figure 4The diagram shows a specific embodiment of the uninterruptible power supply (UPS) control circuit. In this UPS control circuit, the switching power supply 3 includes a transformer circuit T, a rectifier circuit D2, a second diode, and a filter circuit C, which is a capacitor. AC power, typically mains power, is input to the main coil side of the transformer. After being transformed by the transformer into an AC voltage suitable for the load, it is then rectified and filtered by the second diode and capacitor to obtain a stable DC voltage to power the load. When the mains power is normally input, the load operates normally. When the mains power is disconnected, the UPS control circuit can switch to battery 1 to power the load, thus achieving uninterrupted power supply to the load.

[0056] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A continuous power supply control circuit, characterized in that, It includes a first positive connection terminal, a first negative connection terminal, a second positive connection terminal, and a second negative connection terminal. The first positive connection terminal and the first negative connection terminal are used to connect the switching power supply and the electrical load; the second positive connection terminal and the second negative connection terminal are used to connect the electrical load. The uninterruptible power control circuit also includes a battery, an anti-reverse circuit, a first switching transistor, and a second switching transistor. The first terminal of the anti-reverse circuit is connected to the first positive connection terminal and the control terminal of the first switch transistor. The second terminal of the anti-reverse circuit is connected to the positive terminal of the battery, the first terminal of the first switch transistor, the first terminal of the second switch transistor, and the control terminal of the second switch transistor. The negative terminal of the battery is connected to the first negative connection terminal, the second negative connection terminal, and the second terminal of the first switch transistor. The second terminal of the second switch is connected to the second positive terminal, and the second terminal of the first switch is connected to the second negative terminal.

2. The uninterruptible power control circuit according to claim 1, characterized in that, It also includes a first resistor and a second resistor; The first end of the first resistor is connected to the first positive connection terminal of the uninterrupted power control circuit and the first end of the anti-reverse circuit, and the second end of the first resistor is connected to the control terminal of the first switching transistor. The first end of the second resistor is connected to the second end of the anti-reverse circuit, the positive terminal of the battery, and the first connection end of the second switch. The second end of the second resistor is connected to the first connection end of the first switch and the control end of the second switch.

3. The uninterruptible power control circuit according to claim 1, characterized in that, The first switching transistor is a transistor or a MOSFET; the first terminal of the first switching transistor is the collector of the transistor or the drain of the MOSFET, the second terminal of the first switching transistor is the emitter of the transistor or the source of the MOSFET, and the control terminal of the first switching transistor is the base of the transistor or the gate of the MOSFET.

4. The uninterruptible power control circuit according to claim 1, characterized in that, The second switching transistor is a transistor or a MOSFET; the first terminal of the second switching transistor is the collector of the transistor or the drain of the MOSFET, the second terminal of the second switching transistor is the emitter of the transistor or the source of the MOSFET, and the control terminal of the second switching transistor is the base of the transistor or the gate of the MOSFET.

5. The uninterruptible power control circuit according to claim 1, characterized in that, The anti-reverse circuit includes a first diode, with the first terminal of the anti-reverse circuit being the positive terminal of the first diode and the second terminal being the negative terminal of the first diode.

6. The uninterruptible power control circuit according to claim 1, characterized in that, The uninterruptible power control circuit also includes a third resistor, the first end of which is connected to the first positive connection terminal, and the second end of which is connected to the first negative connection terminal.

7. The uninterruptible power control circuit according to claim 1, characterized in that, The two input terminals of the switching power supply are used to connect to the mains power, and the two output terminals of the switching power supply are respectively connected to the first positive connection terminal and the first negative connection terminal of the uninterruptible power control circuit.

8. The uninterruptible power control circuit according to claim 7, characterized in that, The switching power supply includes a transformer circuit, a rectifier circuit, and a filter circuit; The two input terminals of the transformer circuit are connected to the mains power, the first output terminal is connected to the first terminal of the rectifier circuit, and the second output terminal is connected to the first negative connection terminal and the second terminal of the filter circuit. The second terminal of the rectifier circuit is connected to the first positive connection terminal and to the first terminal of the filter circuit.

9. The uninterruptible power control circuit according to claim 8, characterized in that, The rectifier circuit includes a second diode, with the first terminal of the rectifier circuit being the positive terminal of the second diode and the second diode being the negative terminal.

10. The uninterruptible power control circuit according to claim 8, characterized in that, The filter circuit includes a capacitor.

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