A new controllable UPS power supply battery input reverse connection protection circuit

Abstract

The application discloses a novel controllable UPS power supply battery input anti-reverse connection protection circuit, which comprises a key switch module, a comparator circuit, a switch MOS tube circuit, a 12V linear voltage stabilizing power supply module, a 5V linear voltage stabilizing power supply module and a relay module, wherein the key switch module is connected with the 12V linear voltage stabilizing power supply module; the 12V linear voltage stabilizing power supply module is connected with the 5V linear voltage stabilizing power supply module and the switch MOS tube circuit; the switch MOS tube circuit is internally provided with the relay module; and the switch MOS tube circuit is connected with the comparator circuit. Through the above manner, the circuit has the lithium battery activation function, the input UVP protection function, the low-energy-consumption autonomous power-off function and the low-cost input anti-reverse connection function, and the market competitiveness of the product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic technology, in particular to a novel controllable UPS power supply battery input reverse connection protection circuit. BACKGROUND

[0002] In the UPS power supply, the correct connection of the battery is crucial to the normal operation of the system. If the battery polarity is reversed, it may cause the battery voltage to enter the system when the battery is short-circuited and damaged, and even may pose a threat to personal safety. The existing UPS power supply battery input reverse connection protection circuit mainly uses mechanical fuse or unidirectional diode. These methods can play a certain protective role, but there are some shortcomings. For example, mechanical fuse needs to be replaced after melting, which increases the maintenance cost; unidirectional diode may be burned out due to excessive current, which cannot protect the safety of the battery and the UPS system.

[0003] In the selection of UPS power supply battery, compared with lead-acid battery, lithium battery has the advantages of strong durability, light weight and large energy density, and lithium battery becomes the optimal choice for UPS power supply battery, but the protection board of lithium battery will have over-discharge protection function, when the voltage of lithium battery is too low, the lithium battery protection board will protect the lithium battery to stop outputting to the load, which greatly affects the use experience of the UPS power supply.

[0004] Therefore, it is necessary to develop a novel, reliable, low-cost UPS power supply battery input reverse connection protection circuit with reverse connection protection function and lithium battery activation function to meet the safe use requirements of the UPS power supply and improve the use experience of the UPS power supply.

[0005] The inventor submitted a utility model patent application with application number CN202222976523.2 on November 8, 2022, which was disclosed on April 18, 2023 with disclosure number CN218888170U. The patent discloses a battery reverse connection protection circuit and UPS power supply, which realizes the battery reverse connection protection function, but the discrimination between the input voltage and the reference is completed by the controller, which occupies the available resources of the controller and is not conducive to the product to expand more functional applications. SUMMARY

[0006] The present application is aimed at providing a technical solution to overcome the above-mentioned problems.

[0007] The utility model provides a new controllable UPS power battery input anti-reverse connection protection circuit, including main circuit, the main circuit is equipped with button switch module, button switch module is connected with 12V linear voltage stabilizing power module, 12V linear voltage stabilizing power module is connected with 5V linear voltage stabilizing power module, switch MOS tube circuit, the built-in relay module of switch MOS tube circuit is connected with comparator circuit again.

[0008] As a further scheme of the utility model, the button switch module is provided with a button switch S1, one end of the button switch S1 is electrically connected with a diode D1 and a diode D2, the other end of the button switch S1 is connected with Vin, the other end of the diode D1 is connected with BAT+_OUT.

[0009] As a further scheme of the utility model, the comparator circuit is provided with a comparator U3, the connection point 2 of the comparator U3 is electrically connected with a porcelain chip capacitor C5, a chip resistor R8 and a chip resistor R9, the other end of the chip resistor R9 is connected with BAT+_IN, the porcelain chip capacitor C5 and the chip resistor R8 are connected with BAT-, the connection point 3 of the comparator U3 is connected with a porcelain chip capacitor C6, a chip resistor R10 and a chip resistor R11, the other end of the chip resistor R10 is connected with +5V, the connection point 8 of the comparator U3 is connected with +12V, the other end of the porcelain chip capacitor C6 and the chip resistor R11 is electrically connected with the connection point 4 of the comparator U3, the connection point 4 of the comparator U3 is also connected with BAT-.

[0010] As a further scheme of the utility model, the switch MOS tube circuit is provided with a PMOS transistor M1, the connection point D of the PMOS transistor M1 is electrically connected with a diode D2 and a wiring point 4 of a relay module RY1, the wiring point 2 of the relay module RY1 is connected with BAT+_OUT, the wiring point 1 of the relay module RY1 is connected with BAT+_IN, the wiring point 3 of the relay module RY1 is connected with BAT-, the other end of the diode D2 is also connected with BAT-, the connection point S of the PMOS transistor M1 is electrically connected with a chip resistor R2 and a diode D4, the connection point S of the PMOS transistor M1 is also electrically connected with +12V, the connection point G of the PMOS transistor M1 is electrically connected with a chip resistor R1, the other end of the chip resistor R1 is connected with EN.

[0011] As a further scheme of the present application, the switch MOS circuit is further provided with a PMOS transistor M2, a connection point D of the PMOS transistor M2 is electrically connected with a chip resistor R7, the other end of the chip resistor R7 is further connected with an energy storage electrolytic capacitor EC1, the other end of the energy storage electrolytic capacitor EC1 is further connected with EN, a connection point S of the PMOS transistor M2 is also electrically connected with the energy storage electrolytic capacitor EC1, a connection point G of the PMOS transistor M2 is electrically connected with a chip resistor R5 and a chip resistor R6, the other end of the chip resistor R6 is connected with +12V, the other end of the chip resistor R5 is connected with BAT-, the other end of the chip resistor R5 is further connected with an NPN transistor Q1, the NPN transistor Q1 is electrically connected with a chip resistor R3 and a chip resistor R4, the NPN transistor Q1 is further connected with EN, and the other end of the chip resistor R3 is connected with I / O.

[0012] As a further scheme of the present application, the 12V linear voltage stabilizing power module is provided with a 12V linear voltage stabilizing power U1, a connection point 1 of the 12V linear voltage stabilizing power U1 is electrically connected with a ceramic capacitor C1, the connection point 1 is further connected with SW, a connection point 3 of the 12V linear voltage stabilizing power U1 is electrically connected with a ceramic capacitor C2, the connection point 3 is further connected with +12V, a connection point 2 of the 12V linear voltage stabilizing power U1 is electrically connected with the other end of the ceramic capacitor C1 and the ceramic capacitor C2,

[0013] As a further scheme of the present application, the 5V linear voltage stabilizing power module is provided with a 5V linear voltage stabilizing power U2, a connection point 1 of the 5V linear voltage stabilizing power U2 is electrically connected with a ceramic capacitor C4, the connection point 1 is further connected with +5V, a connection point 3 of the 5V linear voltage stabilizing power U2 is electrically connected with a ceramic capacitor C3, the connection point 3 is further connected with +12V, a connection point 2 of the 5V linear voltage stabilizing power U2 is electrically connected with the other end of the ceramic capacitor C3 and the ceramic capacitor C4, and the connection point 2 is further connected with BAT-.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The novel controllable UPS power supply battery input anti-reverse connection protection circuit has the advantages of low cost, input anti-reverse connection function, and the like.

[0016] 2, The novel controllable UPS power supply battery input reverse connection protection circuit has the UPS power supply lithium battery activation function: when the lithium battery is in the over-discharge protection state, the UPS power supply is connected to the mains, the key switch S1 is closed, the mains is converted into a direct current low voltage, the 12V linear voltage regulator U1 is provided with power, the 5V linear voltage regulator U2 and the comparator U3 are provided with working power, the 5V linear voltage regulator U2 provides a reference voltage for the same phase input end of the comparator U3, when the same phase input end of the comparator U3 is less than the reverse input end, the comparator U3 output state is low, +12V passes through the diode D4, the chip resistor R1, the chip resistor R2, the chip resistor R7 and the comparator U3 to charge the energy storage electrolytic capacitor EC1, the DS of the PMOS transistor M1 is in the conductive state during the charging time of the energy storage electrolytic capacitor EC1, so that the relay RY1 changes from the open state to the attracted state, the NPN transistor Q1 is turned on under the control of the high level of the I / O output of the main control chip, and the relay RY1 is always kept in the closed state and will not be disconnected due to the end of the charging of the energy storage electrolytic capacitor EC1, the lithium battery is in the charging state, so that the effect of lithium battery activation is achieved.

[0017] 3, The novel controllable UPS power supply battery input reverse connection protection circuit has the input UVP protection function: when the battery voltage is too low, the key switch S1 is closed, the same phase input end and the reverse input end of the comparator U3 are compared, when the same phase input end is greater than the reverse input end, the comparator U3 output state is in the high resistance state, and the relay RY1 is not attracted, so that the input UVP protection function effect is achieved, and the battery is better protected.

[0018] 4, The novel controllable UPS power supply battery input reverse connection protection circuit has the low-power self-disconnection function: when the power supply is in the protection state, the I / O output of the main control chip is low, the NPN transistor Q1 is cut off, the relay RY1 changes from the attracted state to the open state, and the key switch S1 is in the closed state, so that the energy storage electrolytic capacitor EC1 is still in the stop charging state, so that the self-disconnection function effect is achieved, and the problem that the relay of the common relay reverse connection circuit continues to consume the battery power when the power supply is in the protection state is solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Fig. 1 is a circuit function module flow chart of a novel controllable UPS power supply battery input anti-reverse connection protection circuit.

[0021] Fig. 2 is a circuit structure schematic diagram of a novel controllable UPS power supply battery input anti-reverse connection protection circuit.

[0022] Fig. 3 is a circuit structure schematic diagram of a novel controllable UPS power supply battery input anti-reverse connection protection circuit;

[0023] Fig. 4 is a circuit structure schematic diagram of a novel controllable UPS power supply battery input anti-reverse connection protection circuit;

[0024] Fig. 5 is a circuit structure schematic diagram of a novel controllable UPS power supply battery input anti-reverse connection protection circuit;

[0025] Fig. 6 is a circuit structure schematic diagram of a novel controllable UPS power supply battery input anti-reverse connection protection circuit;

[0026] Fig. 7 is a circuit structure schematic diagram of a novel controllable UPS power supply battery input anti-reverse connection protection circuit.

[0027] In the figure: 1, key switch module; 2, comparator circuit; 3, switch MOS tube circuit; 4, 12V linear voltage regulator module; 5, 5V linear voltage regulator module; 6, relay module. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Please refer to Figs. 1-7In the specific embodiment of the present application, a novel controllable UPS power supply battery input reverse connection protection circuit is provided, which comprises a main circuit, the main circuit is provided with a key switch module 1, the key switch module 1 plays a role of starting the main circuit, the key switch module 1 is provided with a key switch S1, one end of the key switch S1 is electrically connected with a diode D1 and a diode D2, the other end of the key switch S1 is connected with Vin, the other end of the diode D1 is connected with BAT+_OUT, the key switch module 1 is connected with a 12V linear voltage stabilizing power supply module 4, the key switch module 1 is connected with the 12V linear voltage stabilizing power supply module 4, the 12V linear voltage stabilizing power supply module 4 provides 12V voltage for the main circuit, the 12V linear voltage stabilizing power supply module 4 is provided with a 12V linear voltage stabilizing power supply U1, the 12V linear voltage stabilizing power supply U1 mainly provides working power supply for a relay RY1, a 5V linear voltage stabilizing power supply U2 and a comparator U3, the wiring point 1 of the 12V linear voltage stabilizing power supply U1 is electrically connected with a porcelain chip capacitor C1, the wiring point 1 is also connected with SW, the wiring point 3 of the 12V linear voltage stabilizing power supply U1 is electrically connected with a porcelain chip capacitor C2, the wiring point 3 is also connected with +12V, the wiring point 2 of the 12V linear voltage stabilizing power supply U1 is electrically connected with the other end of the porcelain chip capacitor C1 and the porcelain chip capacitor C2, the 12V linear voltage stabilizing power supply module 4 is electrically connected with a 5V linear voltage stabilizing power supply module 5, the 5V linear voltage stabilizing power supply module 5 provides 5V voltage for the main circuit, the 5V linear voltage stabilizing power supply module 5 is provided with a 5V linear voltage stabilizing power supply U2, the 5V linear voltage stabilizing power supply U2 mainly provides reference voltage for a same direction input end of the comparator U3, the wiring point 1 of the 5V linear voltage stabilizing power supply U2 is electrically connected with a porcelain chip capacitor C4, the wiring point 1 is also connected with +5V, the wiring point 3 of the 5V linear voltage stabilizing power supply U2 is electrically connected with a porcelain chip capacitor C3, the wiring point 3 is also connected with +12V, the wiring point 2 of the 5V linear voltage stabilizing power supply U2 is electrically connected with the other end of the porcelain chip capacitor C3 and the porcelain chip capacitor C4, the wiring point 2 is also connected with BAT-.

[0030] The 12V linear voltage stabilizing power module 4 is also connected with the switch MOS tube circuit 3, which plays a role of an automatic circuit switch in the main circuit. The switch MOS tube circuit 3 is internally provided with a relay module 6. The switch MOS tube circuit 3 is provided with a PMOS transistor M1. The connection point D of the PMOS transistor M1 is electrically connected with a diode D2 and a wiring point 4 of a relay RY1. The wiring point 2 of the relay RY1 is connected with BAT+_OUT. The wiring point 1 of the relay RY1 is connected with BAT+_IN. The wiring point 3 of the relay RY1 is connected with BAT-. The other end of the diode D2 is also connected with BAT-. The connection point S of the PMOS transistor M1 is electrically connected with a chip resistor R2 and a diode D4. The connection point S of the PMOS transistor M1 is also electrically connected with +12V. The connection point G of the PMOS transistor M1 is electrically connected with a chip resistor R1. The other end of the chip resistor R1 is connected with EN. The switch MOS tube circuit 3 is also provided with a PMOS transistor M2. The main role of the PMOS transistor M2 is to discharge the energy storage electrolytic capacitor EC1. The connection point D of the PMOS transistor M2 is electrically connected with a chip resistor R7. The other end of the chip resistor R7 is also connected with the energy storage electrolytic capacitor EC1. The other end of the energy storage electrolytic capacitor EC1 is also connected with EN. The connection point S of the PMOS transistor M2 is also electrically connected with the energy storage electrolytic capacitor EC1. The connection point G of the PMOS transistor M2 is electrically connected with a chip resistor R5 and a chip resistor R6. The other end of the chip resistor R6 is connected with +12V. The other end of the chip resistor R5 is connected with BAT-. The other end of the chip resistor R5 is also connected with an NPN transistor Q1. The NPN transistor Q1 is electrically connected with a chip resistor R3 and a chip resistor R4. The NPN transistor Q1 is also connected with EN. The other end of the chip resistor R3 is connected with I / O.

[0031] The switch MOS tube circuit 3 is also connected with a comparator circuit 2. The comparator circuit 2 compares the input voltage with the reference voltage. The comparator circuit 2 is provided with a comparator U3. The connection point 2 of the comparator U3 is electrically connected with a ceramic capacitor C5, a chip resistor R8 and a chip resistor R9. The other end of the chip resistor R9 is connected with BAT+_IN. The ceramic capacitor C5 and the chip resistor R8 are connected with BAT-. The connection point 3 of the comparator U3 is connected with a ceramic capacitor C6, a chip resistor R10 and a chip resistor R11. The other end of the chip resistor R10 is connected with +5V. The connection point 8 of the comparator U3 is connected with +12V. The connection point 4 of the comparator U3 is electrically connected with the other end of the ceramic capacitor C6 and the chip resistor R11. The connection point 4 of the comparator U3 is also connected with BAT-.

[0032] Example one: when the UPS power supply reversely connects the battery end, the button switch S1 is closed, the diode D3 is in the off state, the comparator U3 is in the high impedance state, and the relay RY1 is in the off state, thereby achieving the input anti-reverse connection function. Compared with the traditional UPS battery input anti-reverse connection protection circuit, the input anti-reverse connection function is more reliable and has a lower maintenance cost.

[0033] Example two: when the lithium battery is in the over-discharge protection state, the UPS power supply is connected to the mains, the button switch S1 is closed, the mains is converted into a low-voltage direct current by the diode D1 to provide power for the 12V linear voltage regulator U1, the 12V linear voltage regulator U1 provides working power for the 5V linear voltage regulator U2 and the comparator U3, the 5V linear voltage regulator U2 provides a reference voltage for the same-phase input end of the comparator U3, when the same-phase input end of the comparator U3 is less than the reverse input end, the comparator U3 output state is low, +12V passes through the diode D4, the chip resistor R1, the chip resistor R2, the chip resistor R7, and the comparator U3 to charge the energy storage electrolytic capacitor EC1, the DS of the PMOS transistor M1 is in the on state during the charging time of the energy storage electrolytic capacitor EC1, thereby changing the relay RY1 from the off state to the attracted state, the NPN transistor Q1 is turned on by the high-level I / O output of the main control chip, and the relay RY1 is always kept in the closed state and will not be disconnected due to the end of the charging of the energy storage electrolytic capacitor EC1, the lithium battery is in the charging state, thereby achieving the effect of lithium battery activation.

[0034] Example three: when the battery voltage is too low, the button switch S1 is closed, and the comparator U3 compares the same-phase input end with the reverse input end, when the same-phase input end is greater than the reverse input end, the comparator U3 output state is in the high impedance state, and the relay RY1 is not attracted, thereby achieving the input UVP protection function effect and better protecting the battery.

[0035] Example four: when the power supply is in the protection state, the NPN transistor Q1 is turned off by the low-level I / O output of the main control chip, the relay RY1 changes from the attracted state to the off state, and the button switch S1 is in the closed state, the energy storage electrolytic capacitor EC1 is still in the stop charging state, thereby achieving the effect of a self-disconnection function, and solving the problem that the relay of the common relay anti-reverse connection circuit is still working and consuming battery power when the power supply is in the protection state.

[0036] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A novel controllable UPS power supply battery input reverse connection protection circuit, comprising a main circuit, characterized in that: The main circuit is provided with a key switch module, the key switch module is connected with a 12V linear voltage stabilizing power module, the 12V linear voltage stabilizing power module is connected with a 5V linear voltage stabilizing power module and a switch MOS tube circuit, the switch MOS tube circuit is internally provided with a relay module, and the switch MOS tube circuit is connected with a comparator circuit. The switch MOS tube circuit is also provided with a PMOS transistor M2, a connecting point D of the PMOS transistor M2 is electrically connected with a patch resistor R7, the other end of the patch resistor R7 is also connected with an energy storage electrolytic capacitor EC1, the other end of the energy storage electrolytic capacitor EC1 is also connected with EN, the connecting point S of the PMOS transistor M2 is also electrically connected with the energy storage electrolytic capacitor EC1, the connecting point G of the PMOS transistor M2 is electrically connected with a patch resistor R5 and a patch resistor R6, the other end of the patch resistor R6 is connected with +12V, the other end of the patch resistor R5 is connected with BAT-, the other end of the patch resistor R5 is also connected with an NPN transistor Q1, the NPN transistor Q1 is electrically connected with a patch resistor R3 and a patch resistor R4, the NPN transistor Q1 is also connected with EN, and the other end of the patch resistor R3 is connected with I / O.

2. A novel controllable UPS power supply battery input reverse connection protection circuit according to claim 1, characterized in that: The key switch module is provided with a key switch S1, one end of the key switch S1 is electrically connected with a diode D1 and a diode D2, and the other end of the key switch S1 is connected with Vin.

3. A novel controllable UPS power supply battery input reverse connection protection circuit according to claim 1, characterized in that: The comparator circuit is provided with a comparator U3, a connecting point 2 of the comparator U3 is electrically connected with a ceramic capacitor C5, a patch resistor R8 and a patch resistor R9, the other end of the patch resistor R9 is connected with BAT+_IN, the ceramic capacitor C5 and the patch resistor R8 are connected with BAT-, a connecting point 3 of the comparator U3 is connected with a ceramic capacitor C6, a patch resistor R10 and a patch resistor R11, the other end of the patch resistor R10 is connected with +5V, a connecting point 8 of the comparator U3 is connected with +12V, a connecting point 4 of the comparator U3 is electrically connected with the other end of the ceramic capacitor C6 and the patch resistor R11, and the connecting point 4 of the comparator U3 is also connected with BAT-.

4. A novel controllable UPS power supply battery input reverse connection protection circuit according to claim 1, characterized in that: The switch MOS tube circuit is provided with a PMOS transistor M1, a connecting point D of the PMOS transistor M1 is electrically connected with a diode D2 and a wiring point 4 of a relay module RY1, a wiring point 2 of the relay module RY1 is connected with BAT+_OUT, a wiring point 1 of the relay module RY1 is connected with BAT+_IN, a wiring point 3 of the relay module RY1 is connected with BAT-, the other end of the diode D2 is also connected with BAT-, a connecting point S of the PMOS transistor M1 is electrically connected with a patch resistor R2 and a diode D4, the connecting point S of the PMOS transistor M1 is also electrically connected with +12V, a connecting point G of the PMOS transistor M1 is electrically connected with a patch resistor R1, and the other end of the patch resistor R1 is connected with EN.

5. A novel controllable UPS battery input reverse connection protection circuit according to claim 1, characterized in that: The 12V linear voltage stabilizing power module is provided with a 12V linear voltage stabilizing power U1, a wiring point 1 of the 12V linear voltage stabilizing power U1 is electrically connected with a porcelain condenser C1, the wiring point 1 is also connected with SW, a wiring point 3 of the 12V linear voltage stabilizing power U1 is electrically connected with a porcelain condenser C2, the wiring point 3 is also connected with +12V, a wiring point 2 of the 12V linear voltage stabilizing power U1 is electrically connected with the other end of the porcelain condenser C1 and the porcelain condenser C2, 6. A novel controllable UPS battery input reverse connection protection circuit according to claim 1, characterized in that: The 5V linear voltage stabilizing power module is provided with a 5V linear voltage stabilizing power U2, a wiring point 1 of the 5V linear voltage stabilizing power U2 is electrically connected with a porcelain condenser C4, the wiring point 1 is also connected with +5V, a wiring point 3 of the 5V linear voltage stabilizing power U2 is electrically connected with a porcelain condenser C3, the wiring point 3 is also connected with +12V, a wiring point 2 of the 5V linear voltage stabilizing power U2 is electrically connected with the other end of the porcelain condenser C3 and the porcelain condenser C4, the wiring point 2 is also connected with BAT-.

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