CN215646345U - Uninterrupted power supply circuit - Google Patents
Uninterrupted power supply circuit Download PDFInfo
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- CN215646345U CN215646345U CN202120700890.2U CN202120700890U CN215646345U CN 215646345 U CN215646345 U CN 215646345U CN 202120700890 U CN202120700890 U CN 202120700890U CN 215646345 U CN215646345 U CN 215646345U
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Abstract
The embodiment of the utility model discloses an uninterruptible power supply circuit. The circuit includes: a load; the first power supply is connected with the load and used for providing working voltage for the load; the power supply detection circuit is connected between the load and a first power supply, and is used for detecting the input voltage of the first power supply and controlling the first power supply and the load to be disconnected when the input voltage is lower than a preset value; and the second power supply is connected with the load and used for providing working voltage for the load when the first power supply and the load are disconnected. The embodiment of the utility model realizes uninterrupted power supply for the load.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to an uninterruptible power supply circuit.
Background
With the development of science and technology, electronic equipment is increasingly applied to daily life of people, for example, a plurality of circuit boards are used in automatic equipment such as an ATM (automatic teller machine) cash recycling core, and some functional chips need to be supplied with power uninterruptedly.
However, if a machine fails or is powered off, the special chips cannot work normally, data loss occurs, and certain difficulty is brought to maintenance, so how to ensure uninterrupted power supply to the special chips becomes a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide an uninterruptible power supply circuit to solve the above problems.
In a first aspect, an embodiment of the present invention provides an uninterruptible power supply circuit, where the circuit includes:
a load;
the first power supply is connected with the load and used for providing working voltage for the load;
the power supply detection circuit is connected between the load and a first power supply, and is used for detecting the input voltage of the first power supply and controlling the first power supply and the load to be disconnected when the input voltage is lower than a preset value;
and the second power supply is connected with the load and used for providing working voltage for the load when the first power supply and the load are disconnected.
Preferably, the power detection circuit includes a first voltage monitoring chip, a first triode and a second triode, the first triode is connected between the load and a first power supply, the first power supply is further connected with the first triode through the first voltage monitoring chip and the second triode in sequence, the load is further connected between the first triode and the second triode in parallel, the first voltage monitoring chip is used for detecting the input voltage of the first power supply, and when the input voltage is lower than a preset value, a low level is output, so that the second triode is cut off, the first triode is cut off, and thus the disconnection between the first power supply and the load is controlled.
Preferably, the circuit further comprises:
the first diode is connected between the first triode and a load;
and a second diode connected between the second power supply and a load.
Preferably, the circuit further comprises:
the microprocessor is connected with the second power supply;
and the battery detection circuit is connected between the microprocessor and the second power supply, and is used for detecting the output voltage of the second power supply, and when the output voltage is lower than a preset value, a signal of insufficient battery power is sent to the microprocessor so that the microprocessor sends a prompt of insufficient battery power.
Preferably, the battery detection circuit includes a second voltage monitoring chip, and the second voltage monitoring chip is configured to detect an output voltage of the second power supply, and output a high level to the microprocessor when the output voltage is lower than a preset value.
Preferably, the circuit further comprises:
and the processor is connected with the microprocessor and used for keeping the current working data and stopping working when receiving the prompt of insufficient battery power.
Preferably, the circuit further comprises:
and the LED lamp is connected with the microprocessor, and the microprocessor is used for controlling the LED lamp to be lightened when receiving the signal that the electric quantity of the battery is insufficient.
Preferably, the first power supply is connected to the microprocessor, and the first power supply is configured to provide a working voltage to the microprocessor.
Preferably, the circuit further comprises:
the first capacitor bank is connected in parallel between the first power supply and the first triode;
and the second capacitor bank is connected between the first triode and the load in parallel.
Preferably, the second power supply includes a plurality of energy storage units, and each energy storage unit includes an energy storage capacitor, a current limiting resistor, and a reference voltage source.
The embodiment of the utility model is connected with the load through a first power supply, and the first power supply is used for providing working voltage for the load; the power supply detection circuit is connected between the load and a first power supply, and is used for detecting the input voltage of the first power supply and controlling the first power supply and the load to be disconnected when the input voltage is lower than a preset value; the second power supply is connected with the load and used for providing working voltage for the load when the first power supply is disconnected with the load, so that the problem of data loss caused by power failure of a special load is solved, and the beneficial effect of uninterrupted power supply for the load is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram of an uninterruptible power supply circuit in one embodiment;
FIG. 2 is a block diagram of an uninterruptible power supply circuit in one embodiment;
fig. 3 is a circuit diagram of an uninterruptible power supply circuit in one embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, as shown in fig. 1, an uninterruptible power supply circuit is provided. The uninterruptible power supply circuit specifically includes a load 100, a first power supply 200, a power detection circuit 300, and a second power supply 400.
Specifically, the first power supply 200 is connected to the load 100, and the first power supply 200 is configured to provide a working voltage to the load 100; the power detection circuit 300 is connected between the load 100 and the first power supply 200, and the power detection circuit 300 is configured to detect an input voltage of the first power supply 200, and control a disconnection between the first power supply 200 and the load 100 when the input voltage is lower than a preset value; the second power supply 400 is connected to the load 100, and the second power supply 400 is used to provide an operating voltage to the load 100 when there is a disconnection between the first power supply 200 and the load 100.
In this embodiment, the uninterruptible power supply circuit may be applied to a circuit system of a terminal, where the load 100 is a special load 100 in the terminal, for example, a load 100 such as an MCU (micro controller Unit), an RTC (real time clock chip) and the like which needs uninterrupted power supply, the first power supply 200 is an input power supply provided by a power chip in the terminal after being boosted or stepped down, the input voltage value is 3.3V, the second power supply 400 is an energy storage battery, the output voltage value is also 3.3V, when the circuitry of the terminal is powered on, the load 100 is provided with an operating voltage by the first power supply 200, when the power supply detecting circuit 300 detects that the input voltage of the first power supply 200 is lower than the preset value, that is, when the circuit system of the terminal stops supplying power, the first power supply 200 and the load 100 are controlled to be disconnected, and the second power supply 400 supplies the operating voltage to the load 100.
In the embodiment of the present invention, the first power supply 200 is connected to the load 100, and the first power supply 200 is configured to provide a working voltage for the load 100; a power detection circuit 300 connected between the load 100 and the first power supply 200, wherein the power detection circuit 300 is configured to detect an input voltage of the first power supply 200, and control a disconnection between the first power supply 200 and the load 100 when the input voltage is lower than a preset value; the second power supply 400 is connected with the load 100, and the second power supply 400 is used for providing working voltage for the load 100 when the first power supply 200 and the load 100 are disconnected, so that the problem of data loss caused by power failure of a special load 100 is solved, and the beneficial effect of uninterrupted power supply for the load 100 is achieved.
In one embodiment, as shown in fig. 2, based on the above embodiment, the uninterruptible power supply circuit further includes a microprocessor 500, a battery detection circuit 600, a processor 700, and an LED lamp 800.
Specifically, the microprocessor 500 is connected to the second power supply 400; the battery detection circuit 600 is connected between the microprocessor 500 and the second power supply 400, the battery detection circuit 600 is used for detecting the output voltage of the second power supply 400, and when the output voltage is lower than a preset value, a signal indicating that the battery power is insufficient is sent to the microprocessor 500, so that the microprocessor 500 sends a prompt indicating that the battery power is insufficient. The battery detection circuit 600 includes a second voltage monitoring chip for detecting an output voltage of the second power supply 400 and outputting a high level to the microprocessor 500 when the output voltage is lower than a preset value. The processor 700 is connected to the microprocessor 500, and the processor 700 is configured to maintain the current operation data and stop operating when receiving the indication of low battery power. The LED lamp 800 is connected to the microprocessor 500, and the microprocessor 500 is configured to control the LED lamp 800 to light when receiving the signal of insufficient battery power.
In this embodiment, the second voltage monitoring chip is connected between the microprocessor 500(MCU) and the second power supply 400, the output voltage will decrease when the power of the second power supply 400 is insufficient, the second voltage monitoring chip outputs a high level to the microprocessor 500 when detecting that the output voltage of the second power supply 400 is lower than a preset value, the microprocessor 500 will send a prompt indicating that the power of the battery is insufficient, specifically, the microprocessor 500 can send the prompt indicating that the power of the battery is insufficient as a signal to the processor 700(CPU), the processor 700 can keep the current working data and stop working when receiving the signal, and other components of the control terminal can save the data and stop working. Specifically, the microprocessor 500 may further control the LED lamp 800 to be turned on when receiving the signal of insufficient battery power transmitted by the second voltage monitoring chip, so as to send a prompt of insufficient battery power, wherein the LED lamp 800 is disposed outside the terminal to prompt a user using the terminal. Optionally, the first power supply 200 is further connected to the microprocessor 500, and the first power supply 200 is configured to provide an operating voltage to the microprocessor 500. Further, the second power supply 400 includes a plurality of energy storage units therein, each energy storage unit includes an energy storage capacitor, a current limiting resistor and a reference voltage source, and the power output by the second power supply 400 is the product of the reference voltage provided by the reference voltage source and the number of the energy storage units.
According to the embodiment of the utility model, the microprocessor 500 is connected with the second power supply 400, the battery detection circuit 600 is connected between the microprocessor 500 and the second power supply 400, the LED lamp 800 is connected with the microprocessor 500, and the processor is connected with the microprocessor 500, so that the beneficial effects of timely reminding a user when the uninterrupted power supply circuit cannot supply power and stopping work to keep working data are realized.
In one embodiment, as shown in fig. 3, based on the previous embodiment, the uninterruptible power supply circuit further includes a first diode D1, a second diode D2, a first capacitor bank, and a second capacitor bank.
Specifically, the first diode D1 is connected between the first triode Q1 and the load VCC _ BAT; the second diode Q2 is connected between the second power supply BT and the load VCC _ BAT. The first capacitor group comprises a first capacitor C1 and a third capacitor C3, and the first capacitor C1 and the third capacitor C3 are connected between a first power supply VCC _3V3 and a first triode Q1 in parallel; the second capacitor group comprises a second capacitor C2 and a fourth capacitor C4, and the second capacitor C2 and the fourth capacitor C4 are connected between the first triode Q1 and the load VCC _ BAT in parallel. The power supply detection circuit comprises a first voltage monitoring chip U1, a first triode Q1 and a second triode Q2, wherein the first triode Q1 is connected between a load VCC _ BAT and a first power supply VCC _3V3, the first power supply VCC _3V3 is sequentially connected with the first voltage monitoring chip U1, the second triode Q2 is connected with the first triode Q1, the load VCC _ BAT is connected between a first triode Q1 and a second triode Q2 in parallel, the first voltage monitoring chip U1 is used for detecting the input voltage of the first power supply VCC _3V3, when the input voltage is lower than a preset value, a low level is output, so that the second triode Q2 is cut off, the first triode Q1 is cut off, and therefore the first power supply VCC _3V3 and the load VCC _ BAT are controlled to be disconnected. The second voltage monitoring chip U2 is connected between the microprocessor BAT-ALAM and the second power supply BT, when the second voltage monitoring chip U2 detects that the output voltage of the second power supply BT is lower than a preset value, a high level is output to the microprocessor BAT-ALAM, and the microprocessor BAT-ALAM can give a prompt of insufficient battery power.
In this embodiment, the first transistor Q1 is a PNP transistor, the second transistor Q2 is an NPN transistor, when the circuit system at the terminal is powered on, the first power supply VCC _3V3 inputs a working voltage of 3.3V, the first voltage monitoring chip U1 outputs a high level when detecting that the working voltage input by the first power supply VCC _3V3 is greater than 2.7V, Ub > Ue and Ub > Uc of the second transistor Q2 are greater than Uc, so that the second transistor Q2 enters a saturation region to conduct, since the resistor R2 is connected between the first transistor Q1 and the second transistor Q2, the load VCC _ BAT is connected with a resistor R1, wherein the resistor R1 is 100K, the resistor R2 is 300R, the resistor R1 is much greater than the resistor R2, at this time, Ub of the first transistor Q1 is a voltage division of the load transistor Q2, so Ub < uee of the first transistor 1, Ub < Uc, and thus the first transistor Q1 also enters the saturation region to conduct, if the circuit system of the terminal provides the second power supply BT with the operating voltage to the load VCC _ BAT before being powered on, and the resistor R3 is connected between the second power supply BT and the second diode D2, and the resistor R3 is 510R, the output voltage of the second power supply BT is dropped at the second diode D2, and the input voltage of the first power supply VCC _3V3 is 3.3V, which is greater than the operating voltage of the load VCC _ BAT, so that the input voltage of the first power supply VCC _3V3 can pass through the first diode D1, thereby providing the operating voltage to the load VCC _ BAT, but the output voltage of the second power supply BT cannot pass through the second diode D2 after being dropped. When the circuit system of the terminal stops supplying power, the first voltage monitoring chip U1 outputs a low level, for example, 0 when detecting that the working voltage input by the first power supply VCC _3V3 is less than 2.7V, at this time, Ube of the second triode Q2 is equal to 0, the second triode Q2 enters a cut-off region and is cut off, Ub of the first triode Q1 is the working voltage of the load VCC _ BAT, therefore Ube of the first triode Q1 is greater than 0, the first triode Q1 is also cut off, at this time, the output voltage of the second power supply BT can also pass through the second diode D2 after being dropped, so as to provide the working voltage for the load VCC _ BAT.
Furthermore, the first capacitor C1 is 33uF, the second capacitor C2 is 0.1uF, the third capacitor C3 is 0.1uF, the fourth capacitor C4 is 47uF, and the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 make the power waveform of the first triode Q1 gentle and small in fluctuation when the first triode Q1 is turned on or off. In addition, other necessary or unnecessary resistors and capacitors are included in the circuit.
According to the embodiment of the utility model, the stable switching of the power supply can be realized through the simple circuit design of the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, the first capacitor group and the second capacitor group, so that the effect of uninterrupted power supply is achieved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An uninterruptible power supply circuit, comprising:
a load;
the first power supply is connected with the load and used for providing working voltage for the load;
the power supply detection circuit is connected between the load and a first power supply, and is used for detecting the input voltage of the first power supply and controlling the first power supply and the load to be disconnected when the input voltage is lower than a preset value;
and the second power supply is connected with the load and used for providing working voltage for the load when the first power supply and the load are disconnected.
2. The circuit of claim 1, wherein the power detection circuit comprises a first voltage monitoring chip, a first transistor and a second transistor, the first transistor is connected between the load and a first power supply, the first power supply is further connected to the first transistor through the first voltage monitoring chip and the second transistor in sequence, the load is further connected in parallel between the first transistor and the second transistor, the first voltage monitoring chip is configured to detect an input voltage of the first power supply, and when the input voltage is lower than a preset value, a low level is output to turn off the second transistor and turn off the first transistor, thereby controlling a circuit break between the first power supply and the load.
3. The circuit of claim 2, further comprising:
the first diode is connected between the first triode and a load;
and a second diode connected between the second power supply and a load.
4. The circuit of claim 1, further comprising:
the microprocessor is connected with the second power supply;
and the battery detection circuit is connected between the microprocessor and the second power supply, and is used for detecting the output voltage of the second power supply, and when the output voltage is lower than a preset value, a signal of insufficient battery power is sent to the microprocessor so that the microprocessor sends a prompt of insufficient battery power.
5. The circuit of claim 4, wherein the battery detection circuit comprises a second voltage monitoring chip, the second voltage monitoring chip is configured to detect an output voltage of the second power supply, and output a high level to the microprocessor when the output voltage is lower than a preset value.
6. The circuit of claim 4, further comprising:
and the processor is connected with the microprocessor and used for keeping the current working data and stopping working when receiving the prompt of insufficient battery power.
7. The circuit of claim 4, further comprising:
and the LED lamp is connected with the microprocessor, and the microprocessor is used for controlling the LED lamp to be lightened when receiving the signal that the electric quantity of the battery is insufficient.
8. The circuit of claim 4, wherein the first power supply is coupled to the microprocessor, the first power supply being configured to provide an operating voltage to the microprocessor.
9. The circuit of claim 1, further comprising:
the first capacitor bank is connected in parallel between the first power supply and the first triode;
and the second capacitor bank is connected between the first triode and the load in parallel.
10. The circuit of claim 1, wherein the second power supply comprises a plurality of energy storage units, each of the energy storage units comprising an energy storage capacitor, a current limiting resistor, and a reference voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120700890.2U CN215646345U (en) | 2021-04-07 | 2021-04-07 | Uninterrupted power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120700890.2U CN215646345U (en) | 2021-04-07 | 2021-04-07 | Uninterrupted power supply circuit |
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| Publication Number | Publication Date |
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| CN215646345U true CN215646345U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120700890.2U Active CN215646345U (en) | 2021-04-07 | 2021-04-07 | Uninterrupted power supply circuit |
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| CN (1) | CN215646345U (en) |
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- 2021-04-07 CN CN202120700890.2U patent/CN215646345U/en active Active
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