CN214176987U - Multi-power supply system and multi-power supply switching circuit - Google Patents
Multi-power supply system and multi-power supply switching circuit Download PDFInfo
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- CN214176987U CN214176987U CN202023317027.3U CN202023317027U CN214176987U CN 214176987 U CN214176987 U CN 214176987U CN 202023317027 U CN202023317027 U CN 202023317027U CN 214176987 U CN214176987 U CN 214176987U
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Abstract
The utility model belongs to the technical field of the power switches, concretely relates to many power system and many power switching circuit. The power supply switching circuit comprises a main power supply branch, an auxiliary power supply branch, a first switching tube, a second switching tube and a third switching tube; the first switch tube is connected in series on the auxiliary power supply branch; the control end of the third switching tube is used for connecting a main power supply, the input end of the third switching tube is used for connecting an auxiliary power supply, the input end of the third switching tube is also connected with the second switching tube, and the output end of the third switching tube is connected with the negative electrode of the system power supply; the input end of the second switch tube is used for connecting an auxiliary power supply, the input end of the second switch tube is also connected with the control end of the third switch tube, and the output end of the second switch tube is connected with the negative electrode of the system power supply. The utility model discloses a change automatic seamless switching of carrying on according to outside power supply, and simple structure, low cost, the application scene at the specially adapted unmanned on duty information acquisition terminal.
Description
Technical Field
The utility model belongs to the technical field of the power switches, concretely relates to many power system and many power switching circuit.
Background
In some application scenarios, for example, in an unattended base station, it is required that each functional module in the base station cannot work due to unstable power supply or power failure, and two sets of power supplies are generally provided in the base station to prevent this situation from occurring. How to realize the seamless switching of the two sets of power supplies is the key point of research.
For example, chinese utility model patent with the publication number CN201032694Y discloses a dual power switching loop, the circuit of which is shown in fig. 1, and it can be seen from the figure that transistor Q4 and transistor Q3 constitute the change-over switch of the battery and the main circuit power supply, DET2 judges the voltage of the main circuit power supply whether to turn on the standby power supply, when the main circuit power supply has a power failure or the voltage is insufficient, it can automatically switch to the battery, and the battery supplies power to the system equipment, so that the equipment continues to work. However, this circuit also has two problems: firstly, the main circuit power supply is suddenly powered off, and the system can be reset possibly in the process of switching the battery and the main circuit power supply, so that seamless switching can not be realized; the second is the lack of necessary low voltage limits on the battery, which may cause system logic errors when the battery voltage is too low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a many power systems and many power switching circuit for realize main power source and auxiliary power source's seamless switching.
In order to solve the technical problem, the technical scheme of the utility model includes:
the utility model provides a multi-power supply switching circuit, which comprises a main power supply branch, an auxiliary power supply branch, a first switch tube, a second switch tube and a third switch tube;
one end of the main power supply branch is used for connecting a main power supply, one end of the auxiliary power supply branch is used for connecting an auxiliary power supply, and the other end of the main power supply branch is connected with the other end of the auxiliary power supply branch and then used for supplying power to connect a load; the first switch tube is connected in series on the auxiliary power supply branch;
the control end of the third switching tube is used for connecting a main power supply, the input end of the third switching tube is used for connecting an auxiliary power supply, the input end of the third switching tube is also connected with the second switching tube, and the output end of the third switching tube is connected with the negative electrode of the system power supply;
the input end of the second switch tube is used for connecting an auxiliary power supply, the input end of the second switch tube is also connected with the control end of the third switch tube, and the output end of the second switch tube is connected with the negative electrode of the system power supply.
The beneficial effects of the above technical scheme are: the utility model discloses a many power supply switching circuit, under the condition that the main power supply can normally supply power, the third switch tube switches on, leads to the second switch tube to cut off, and then the first switch tube cuts off, thereby auxiliary power supply can't supply power for the load, and the main power supply supplies power for the load through the main power supply branch road; under the condition that the main power supply cannot normally supply power, the third switching tube is cut off, so that the second switching tube is switched on, and further the first switching tube is switched on, the auxiliary power supply supplies power for the load, and automatic seamless switching of the external power supply is realized. Moreover, the whole switching circuit is simple in structure and low in cost, and is particularly suitable for application scenes of the unattended information acquisition terminal.
As a further improvement of the switching circuit, in order to prevent the main power supply and the auxiliary power supply from generating a backward current phenomenon due to inconsistent voltage, a first diode is connected in series on the power supply branch of the auxiliary power supply, and the anode of the first diode is used for connecting the auxiliary power supply; and a second diode is connected in series with the main power supply branch circuit, and the anode of the second diode is used for connecting a main power supply.
As a further improvement of the switching circuit, in order to ensure stable and reliable operation of the load under the condition that neither the main power supply nor the auxiliary power supply can supply power, the multi-power supply switching circuit further comprises an energy storage module charging branch and an energy storage module discharging branch;
one end of the energy storage module charging branch is connected with the other end of the main power supply branch, and the other end of the energy storage module charging branch is used for being connected with the negative electrode of the system power supply through the energy storage module;
one end of the energy storage module discharging branch is used for supplying power and connecting a load, and the other end of the energy storage module discharging branch is used for connecting the negative electrode of a system power supply through the energy storage module; and a third diode is connected in series on the energy storage module discharge branch circuit, and the anode of the third diode is used for connecting the energy storage module.
As a further improvement of the switching circuit, in order to accurately monitor the voltage of the auxiliary power supply, the multi-power supply switching circuit further comprises a voltage division branch, wherein one end of the voltage division branch is connected with the output end of the first switching tube, and the other end of the voltage division branch is connected with the negative electrode of the system power supply; and the voltage division point of the voltage division branch is used for connecting a controller.
As a further improvement of the switching circuit, the first switching tube and the second switching tube are NPN-type triodes, and the third switching tube is a PMOS tube.
The utility model also provides a multi-power supply system, which comprises a main power supply, an auxiliary power supply and a multi-power supply switching circuit; the multi-power supply switching circuit comprises a main power supply branch, an auxiliary power supply branch, a first switching tube, a second switching tube and a third switching tube;
one end of the main power supply branch is connected with a main power supply, one end of the auxiliary power supply branch is connected with an auxiliary power supply, and the other end of the main power supply branch is connected with the other end of the auxiliary power supply branch for power supply connection with a load; the first switch tube is connected in series on the auxiliary power supply branch;
the control end of the third switching tube is connected with the main power supply, the input end of the third switching tube is connected with the auxiliary power supply, the input end of the third switching tube is also connected with the second switching tube, and the output end of the third switching tube is connected with the negative electrode of the system power supply;
the input end of the second switch tube is connected with the auxiliary power supply, the input end of the second switch tube is also connected with the control end of the third switch tube, and the output end of the second switch tube is connected with the negative electrode of the system power supply.
The beneficial effects of the above technical scheme are: the utility model discloses a many power systems, including many power switching circuit, this many power switching circuit can realize: under the condition that the main power supply can normally supply power, the third switching tube is conducted to cause the second switching tube to be cut off, and further the first switching tube is cut off, so that the auxiliary power supply can not supply power to the load, and the main power supply supplies power to the load through the main power supply branch; under the condition that the main power supply cannot normally supply power, the third switching tube is cut off, so that the second switching tube is switched on, and further the first switching tube is switched on, the auxiliary power supply supplies power for the load, and automatic seamless switching of the external power supply is realized. Moreover, the whole switching circuit is simple in structure and low in cost, and is particularly suitable for application scenes of the unattended information acquisition terminal.
As a further improvement of the multi-power supply system, in order to prevent the main power supply and the auxiliary power supply from generating a backward current phenomenon due to inconsistent voltage, a first diode is connected in series on a power supply branch of the auxiliary power supply, and an anode of the first diode is used for connecting the auxiliary power supply; and a second diode is connected in series with the main power supply branch circuit, and the anode of the second diode is used for connecting a main power supply.
As a further improvement of a multi-power supply system, in order to ensure stable and reliable operation of a load under the condition that neither a main power supply nor an auxiliary power supply can supply power, the multi-power supply system further comprises an energy storage module, and the multi-power supply switching circuit further comprises an energy storage module charging branch and an energy storage module discharging branch;
one end of the energy storage module charging branch is connected with the other end of the main power supply branch, and the other end of the energy storage module charging branch is connected with the negative electrode of the system power supply through the energy storage module;
one end of the energy storage module discharging branch is used for supplying power and connecting a load, and the other end of the energy storage module discharging branch is connected with the negative electrode of a system power supply through the energy storage module; and a third diode is connected in series on the energy storage module discharge branch circuit, and the anode of the third diode is used for connecting the energy storage module.
As a further improvement of the multi-power supply system, in order to accurately monitor the voltage of the auxiliary power supply, the multi-power supply switching circuit further comprises a voltage division branch, wherein one end of the voltage division branch is connected with the output end of the first switching tube, and the other end of the voltage division branch is connected with the negative electrode of the system power supply; and the voltage division point of the voltage division branch is used for connecting a controller.
As a further improvement of the multi-power-supply system, the first switch tube and the second switch tube are NPN type triodes, and the third switch tube is a PMOS tube.
Drawings
FIG. 1 is a circuit diagram of a prior art multiple power switching loop;
fig. 2 is a circuit diagram of the multi-power supply system of the present invention.
Detailed Description
Multiple power system embodiments:
the utility model discloses a many power systems, its circuit diagram is shown in fig. 2, including main power supply 5V, auxiliary power source (for the battery), super capacitor C1 and power switching circuit.
As shown in fig. 2, the power switching circuit includes a main power supply branch, an auxiliary power supply branch, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a voltage dividing branch, an energy storage module charging branch, and an energy storage module discharging branch. In this embodiment, the first switch Q1 is a PMOS transistor, and the second switch Q2 and the third switch Q3 are both NPN transistors.
One end of the main power supply branch is connected with a main power supply 5V, a second diode D2 is arranged on the main power supply branch in series, and the anode of the second diode D2 is connected with the main power supply 5V. One end of the auxiliary power supply branch is connected with an auxiliary power supply, a first switch tube Q1 and a first diode D1 are arranged on the auxiliary power supply branch in series, namely, the 3 rd pin (the input end of Q1) of the first switch tube Q1 is connected with the auxiliary power supply, and the 2 nd pin (the output end of Q1) of the first switch tube Q1 is connected with the anode of the first switch tube D1. The other end of the main power supply branch and the other end of the auxiliary power supply branch are connected together and then used for supplying power to connect with a load (each circuit functional module in fig. 1). The first diode D1 and the second diode D2 are used for isolating the main power supply 5V from the auxiliary power supply, so that the main power supply 5V and the auxiliary power supply are prevented from causing the current to flow backward from the high-voltage power supply to the low-voltage power supply due to different voltages.
The main power supply 5V is connected to the 1 st pin (the control end of Q3) of the third switching tube Q3 through a resistor R6, the 2 nd pin (the output end of Q3) of the third switching tube Q3 is connected to the negative electrode (shown as ground in fig. 1) of the system power supply, the 3 rd pin (the input end of Q3) of the third switching tube Q3 is connected to the auxiliary power supply through a resistor R3, and a resistor R8 is further arranged between the 3 rd pin and the 1 st pin of the third switching tube Q3 in series. The resistor R8 and the resistor R3 constitute a voltage divider circuit. When the voltage on the resistor R8 is less than 0.6V, the second switch tube Q2 will be cut off.
The 3 rd pin of the third switching tube Q3 is connected to the 1 st pin (the control end of Q2) of the second switching tube Q2 through a resistor R5, the 2 nd pin of the second switching tube Q2 is connected to the negative electrode of the system power supply, the 3 rd pin (the input end of Q3) of the third switching tube Q3 is connected to the 1 st pin (the control end of Q1) of the first switching tube Q1 through a resistor R4, and the 1 st pin of the first switching tube Q1 is also connected to the 3 rd pin of the first switching tube Q1 through a resistor R1.
A voltage division branch is connected between the 2 nd pin of the first switching tube Q1 and the negative electrode of the system power supply, a resistor R2 and a resistor R7 are connected in series on the voltage division branch, and the serial connection point of the resistor R2 and the resistor R7 (namely the voltage division point of the voltage division branch) is connected with the analog quantity acquisition system of the unattended acquisition terminal.
One end of the energy storage module charging branch circuit is connected with the cathode of the first diode D1, the other end of the energy storage module charging branch circuit is connected with one end of the super capacitor C1, and a resistor R9 is connected in series on the energy storage module charging branch circuit. One end of the energy storage module discharging branch circuit is used for connecting a load, the other end of the energy storage module discharging branch circuit is connected with one end of a super capacitor C1, and a third diode D3 is connected in series on the energy storage module discharging branch circuit. The other end of the super capacitor C1 is connected with the negative pole of the system power supply.
The working process and principle of the above-mentioned multi-power system are explained below, and mainly include the following three processes:
1) when the main power supply 5V exists and the main power supply 5V has no fault, no power failure and the like, the third switching tube Q3 is turned on, and the third switching tube Q3 pulls down the voltage on the resistor R8 to be below 0.3V, so that the second switching tube Q2 is turned off; after the second switch tube Q2 is cut off, the first switch tube Q1 is cut off; at this time, the main power supply 5V charges the super capacitor C1 through the second diode D2 on the main power supply branch and the R9 on the energy storage module charging branch, and supplies power to other various circuit function modules in the system through the second diode D2 on the main power supply branch.
2) When the main power supply fails to supply power, such as the absence of the main power supply 5V, the failure of the main power supply 5V, the power failure of the main power supply 5V and the like, the third switching tube Q3 is cut off, and the second switching tube Q2 is switched on; after the second switch tube Q2 is turned on, the first switch tube Q1 is turned on; at this time, the auxiliary power supply charges the super capacitor C1 through the first switch tube Q1 and the first diode D1 on the auxiliary power supply branch and the R9 on the energy storage module charging branch, and supplies power to other various circuit function modules in the system through the first switch tube Q1 and the first diode D1 on the auxiliary power supply branch. In the process, the AD acquisition system of the unattended acquisition terminal acquires the voltage on the resistor R7, and further obtains the voltage output by the 2 nd pin of the first switching tube Q1, that is, the auxiliary power supply voltage, according to the voltage on the R7. When finding that the auxiliary power supply voltage is lower, the unattended acquisition terminal can inform a user in an alarm prompting mode, so that the user is reminded to maintain or replace the auxiliary power supply, and the stability, reliability and service life of the system are improved.
3) When the auxiliary power supply is turned off due to the fact that the voltage of the auxiliary power supply is too low and the main power supply 5V fails or fails to supply power, the super capacitor C1 supplies power to other circuit function modules of the system through the third diode D3 on the discharging branch of the energy storage module.
Overall, the utility model discloses can change automatic seamless switching of carrying on according to the external power supply of information acquisition terminal is watched to the unmanned value, still carry out certain protection to the battery simultaneously, improve the life of battery, the device is simple, simple structure, low cost, the specially adapted application scene at information acquisition terminal is watched to the unmanned value.
Multiple power supply switching circuit embodiment:
the utility model discloses a many power supply switching circuit embodiment, for many power supply system switching circuit that introduces in many power supply system embodiment. Since the multi-power system switching circuit is described in detail in the multi-power system embodiment, the description of this embodiment is omitted.
Claims (10)
1. A multi-power supply switching circuit is characterized by comprising a main power supply branch, an auxiliary power supply branch, a first switching tube, a second switching tube and a third switching tube;
one end of the main power supply branch is used for connecting a main power supply, one end of the auxiliary power supply branch is used for connecting an auxiliary power supply, and the other end of the main power supply branch is connected with the other end of the auxiliary power supply branch and then used for supplying power to connect a load; the first switch tube is connected in series on the auxiliary power supply branch;
the control end of the third switching tube is used for connecting a main power supply, the input end of the third switching tube is used for connecting an auxiliary power supply, the input end of the third switching tube is also connected with the second switching tube, and the output end of the third switching tube is connected with the negative electrode of the system power supply;
the input end of the second switch tube is used for connecting an auxiliary power supply, the input end of the second switch tube is also connected with the control end of the third switch tube, and the output end of the second switch tube is connected with the negative electrode of the system power supply.
2. The multi-power-supply switching circuit as claimed in claim 1, wherein a first diode is connected in series with the auxiliary power supply branch, and an anode of the first diode is used for connecting an auxiliary power supply; and a second diode is connected in series with the main power supply branch circuit, and the anode of the second diode is used for connecting a main power supply.
3. The multi-power switching circuit of claim 1, further comprising an energy storage module charging branch and an energy storage module discharging branch;
one end of the energy storage module charging branch is connected with the other end of the main power supply branch, and the other end of the energy storage module charging branch is used for being connected with the negative electrode of the system power supply through the energy storage module;
one end of the energy storage module discharging branch is used for supplying power and connecting a load, and the other end of the energy storage module discharging branch is used for connecting the negative electrode of a system power supply through the energy storage module; and a third diode is connected in series on the energy storage module discharge branch circuit, and the anode of the third diode is used for connecting the energy storage module.
4. The multi-power-supply switching circuit according to claim 1, further comprising a voltage dividing branch, wherein one end of the voltage dividing branch is connected to the output end of the first switching tube, and the other end of the voltage dividing branch is connected to the negative electrode of the system power supply; and the voltage division point of the voltage division branch is used for connecting a controller.
5. A multi-power switching circuit according to any one of claims 1 to 4, wherein the first switching tube and the second switching tube are NPN type triodes, and the third switching tube is a PMOS tube.
6. A multi-power supply system is characterized by comprising a main power supply, an auxiliary power supply and a multi-power supply switching circuit; the multi-power supply switching circuit comprises a main power supply branch, an auxiliary power supply branch, a first switching tube, a second switching tube and a third switching tube;
one end of the main power supply branch is connected with a main power supply, one end of the auxiliary power supply branch is connected with an auxiliary power supply, and the other end of the main power supply branch is connected with the other end of the auxiliary power supply branch for power supply connection with a load; the first switch tube is connected in series on the auxiliary power supply branch;
the control end of the third switching tube is connected with the main power supply, the input end of the third switching tube is connected with the auxiliary power supply, the input end of the third switching tube is also connected with the second switching tube, and the output end of the third switching tube is connected with the negative electrode of the system power supply;
the input end of the second switch tube is connected with the auxiliary power supply, the input end of the second switch tube is also connected with the control end of the third switch tube, and the output end of the second switch tube is connected with the negative electrode of the system power supply.
7. The multi-power supply system as claimed in claim 6, wherein a first diode is connected in series with the auxiliary power supply branch, and an anode of the first diode is used for connecting the auxiliary power supply; and a second diode is connected in series with the main power supply branch circuit, and the anode of the second diode is used for connecting a main power supply.
8. The multiple power supply system of claim 6, further comprising an energy storage module, wherein the multiple power supply switching circuit further comprises an energy storage module charging branch and an energy storage module discharging branch;
one end of the energy storage module charging branch is connected with the other end of the main power supply branch, and the other end of the energy storage module charging branch is connected with the negative electrode of the system power supply through the energy storage module;
one end of the energy storage module discharging branch is used for supplying power and connecting a load, and the other end of the energy storage module discharging branch is connected with the negative electrode of a system power supply through the energy storage module; and a third diode is connected in series on the energy storage module discharge branch circuit, and the anode of the third diode is used for connecting the energy storage module.
9. The multi-power supply system according to claim 6, wherein the multi-power supply switching circuit further comprises a voltage dividing branch, one end of the voltage dividing branch is connected with the output end of the first switching tube, and the other end of the voltage dividing branch is connected with the negative electrode of the system power supply; and the voltage division point of the voltage division branch is used for connecting a controller.
10. A multi-power-supply system according to any one of claims 6 to 9, wherein the first switch tube and the second switch tube are NPN type triodes, and the third switch tube is a PMOS tube.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050639A (en) * | 2021-10-26 | 2022-02-15 | 许继电源有限公司 | Main/standby power supply switching device and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050639A (en) * | 2021-10-26 | 2022-02-15 | 许继电源有限公司 | Main/standby power supply switching device and control method thereof |
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