CN112467868B - Multi-path power supply switching circuit and method - Google Patents
Multi-path power supply switching circuit and method Download PDFInfo
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- CN112467868B CN112467868B CN202011393097.9A CN202011393097A CN112467868B CN 112467868 B CN112467868 B CN 112467868B CN 202011393097 A CN202011393097 A CN 202011393097A CN 112467868 B CN112467868 B CN 112467868B
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- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a multi-path power supply switching circuit and a multi-path power supply switching method in the technical field of multi-power supply switching, and aims to solve the technical problems that in the prior art, under the condition of power supply of a plurality of battery packs, a professional chip is adopted for circuit switching, the product cost is high, and popularization and use are not easy. The circuit comprises a first reverse P-MOS tube connected between the main power supply and the load unit, a second reverse P-MOS tube connected between the auxiliary power supply and the load unit, and a second reverse P-MOS tube connected with the load unit through a forward P-MOS tube; the grid electrode of the first reverse P-MOS tube is grounded through the control of the first N-MOS tube, the source electrode of the second reverse P-MOS tube is connected with the grid electrode of the second reverse P-MOS tube through a PNP triode, the base electrode of the PNP triode is connected with the drain electrode of the second N-MOS tube, the source electrode of the second N-MOS tube is grounded, and the grid electrode of the second N-MOS tube is connected with a main power supply.
Description
Technical Field
The invention relates to a multi-path power supply switching circuit and a method, and belongs to the technical field of multi-power supply switching.
Background
Currently, more and more electronic devices allow multiple power supplies to supply power, taking an electronic device powered by two groups of battery packs as an example, at ordinary times, the electronic device is mainly powered by a main battery pack, and a secondary battery pack does not supply power; when the main battery pack is damaged, detached or internally protected, the auxiliary battery pack is used for supplying power. Because the battery packs are not regulated power supplies, the voltage of the battery packs can be obviously changed along with the consumption of the internal electric quantity, and therefore, under the condition of adopting two battery packs to supply power, isolation measures are needed to be taken, and the situation that instantaneous large current is generated due to the mutual charging of the battery packs, so that potential safety hazards are caused is prevented.
At present, a multi-path power supply scheme in the market generally adopts a direct current switch power supply to supply power, a secondary power supply is a battery pack, the voltage of the switch power supply is stable and higher than that of a battery, and the possibility of reverse filling of the voltage of the battery pack of the secondary power supply is not considered in design. However, for supplying power to a plurality of battery packs, a professional chip can only be used for solving the circuit switching problem of the battery packs, but the chip has high selling price, and the whole cost is high after the chip is made into a switching circuit, so that the chip is not easy to popularize and use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a multi-path power supply switching circuit and a multi-path power supply switching method, so as to solve the technical problems that the circuit is switched by adopting a professional chip under the condition of supplying power to a plurality of battery packs in the prior art, the product cost is high, and the popularization and the use are not easy.
In order to solve the technical problems, the invention adopts the following technical scheme:
A multipath power supply switching circuit comprises a first reverse P-MOS tube connected between a main power supply and a load unit, a second reverse P-MOS tube connected between a secondary power supply and the load unit, and a second reverse P-MOS tube electrically connected with the load unit through a forward P-MOS tube, wherein the sources of the first reverse P-MOS tube and the second reverse P-MOS tube are reversely connected with a drain electrode;
The grid electrode of the first reverse P-MOS tube is grounded through the control of the first N-MOS tube, the sources of the second reverse P-MOS tube and the positive P-MOS tube are electrically connected with the grid electrodes of the second reverse P-MOS tube and the positive P-MOS tube through PNP triodes, the base electrode of the PNP triodes is electrically connected with the drain electrode of the second N-MOS tube, the source electrode of the second N-MOS tube is grounded, and the grid electrode of the second N-MOS tube is electrically connected with a main power supply.
Further, the emitter of the PNP triode is electrically connected with the sources of the second reverse P-MOS tube and the forward P-MOS tube, and the collector of the PNP triode is electrically connected with the gates of the second reverse P-MOS tube and the forward P-MOS tube.
Further, the main power supply or/and the auxiliary power supply is/are a non-stabilized power supply.
Further, the unregulated power source includes a battery pack.
In order to achieve the above object, the present invention further provides a multi-path power supply switching method, which is implemented based on the multi-path power supply switching circuit provided by the present invention, and includes the following steps:
The first reverse P-MOS tube responds to continuous output of the main power supply through the first N-MOS tube and is communicated with a power supply loop between the main power supply and the load unit;
the PNP triode responds to the continuous output of the main power supply through the second N-MOS tube and is in a conducting state;
The second reverse P-MOS tube and the forward P-MOS tube respond to the continuous output of the main power supply through the PNP triode in the on state, and disconnect the power supply loop between the auxiliary power supply and the load unit and the main power supply.
Further, the method further comprises the following steps:
The PNP triode responds to the output interruption of the main power supply through the second N-MOS tube and is in a closed state;
the second reverse P-MOS tube and the forward P-MOS tube are connected with a power supply loop between the auxiliary power supply and the load unit through PNP triodes in a closed state in response to output interruption of the main power supply.
Compared with the prior art, the invention has the beneficial effects that: the circuit and the method skillfully utilize the body diode characteristic of the reverse P-MOS tube, and a reverse P-MOS tube with a source electrode and a drain electrode which are reversely connected is respectively connected into the power supply loop of the main battery pack and the power supply loop of the auxiliary battery pack. When the main power supply continuously supplies power, the first reverse P-MOS tube responds to the continuous output of the main power supply through the first N-MOS tube and is communicated with a power supply loop between the main power supply and the load unit; the second reverse P-MOS tube and the forward P-MOS tube respond to the continuous output of the main power supply through the PNP triode in the on state, and disconnect the power supply loop between the auxiliary power supply and the load unit and the main power supply. When the power supply of the main power supply is interrupted, the second reverse P-MOS tube and the forward P-MOS tube respond to the output interruption of the main power supply through the PNP triode in the off state and are communicated with a power supply loop between the auxiliary power supply and the load unit. Compared with the prior art, the circuit and the method of the invention adopt a reverse P-MOS tube mode to build the circuit, thereby not only saving the cost of devices such as the anti-backflow diode and the like, but also ensuring that the voltage of the battery pack has almost no voltage drop to the load; the hardware condition that the main power supply and the auxiliary power supply are not regulated can be supported, and the possibility of mutual and inverse charging between the two voltage sources is isolated.
Drawings
FIG. 1 is a schematic diagram of a dual battery power switching circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a modified version of a three-battery power switching circuit in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
The specific embodiment of the invention provides a multi-path power supply switching circuit, which is characterized in that a main power supply is used for supplying power to a load unit, a plurality of auxiliary power supplies connected with the main power supply in parallel are used as standby power supplies, and when the main power supply is damaged, detached or internally protected, the auxiliary power supplies are used for supplying power. The main power supply and the auxiliary power supply adopt non-stabilized power supplies, and the non-stabilized power supplies commonly used in practice comprise a battery pack.
As shown in fig. 1, a schematic diagram of a dual battery power supply switching circuit according to an embodiment of the present invention includes: the main battery pack and the auxiliary battery pack are connected with the load inlet, the main battery pack power supply loop and the auxiliary battery pack power supply loop. The main battery pack power supply loop comprises a large-current P-MOS tube (Q1), a signal conversion N-MOS tube (Q4) and four voltage dividing resistors (R1, R2, R5 and R6); the secondary battery pack power supply loop comprises two large-current P-MOS tubes (Q2 and Q3), a signal conversion N-MOS tube (Q5), five voltage dividing resistors (R3, R4, R7, R8 and R9) and a PNP triode (Q6). In the three large-current P-MOS tubes, Q1 and Q2 are connected with normal circuits in opposite directions, and a connection method that the source electrode and the drain electrode are reversely connected is adopted. For convenience of description, Q1 and Q2 may be defined as P-MOS transistors connected in opposite directions, where Q1 is a first P-MOS transistor connected in opposite directions, Q2 is a second P-MOS transistor connected in opposite directions, Q3 is a P-MOS transistor connected in forward directions, Q4 is a first N-MOS transistor, and Q5 is a second N-MOS transistor.
More specifically, a first reverse P-MOS tube (Q1) is connected between the main battery pack and the load unit to play a role of switching on and off a power supply loop of the main battery pack, a drain electrode of the first reverse P-MOS tube (Q1) is connected with the main battery pack, a source electrode of the first reverse P-MOS tube (Q1) is connected with the load unit, and a grid electrode of the first reverse P-MOS tube (Q1) is grounded through control of the first N-MOS tube (Q4).
More specifically, the second reverse P-MOS tube (Q2) and the forward P-MOS tube (Q3) are connected in series between the auxiliary battery pack and the load unit to play a role of switching on and off a power supply loop of the auxiliary battery pack, wherein the second reverse P-MOS tube (Q2) is connected between the auxiliary battery pack and the forward P-MOS tube (Q3). The second reverse P-MOS tube (Q2) and the source electrode of the positive P-MOS tube (Q3) are connected with the emitter electrode of the PNP triode (Q6), the second reverse P-MOS tube (Q2) and the grid electrode of the positive P-MOS tube (Q3) are connected with the collector electrode of the PNP triode (Q6), the base electrode of the PNP triode (Q6) is connected with the drain electrode of the second N-MOS tube (Q5), the source electrode of the second N-MOS tube (Q5) is grounded, and the grid electrode of the second N-MOS tube (Q5) is connected with the main battery pack.
In the embodiment, when the main battery pack has continuous output, the Q1 conducts high voltage to the source electrode of the Q1 through the body diode characteristic of the P-MOS tube, and then the Q1 is completely opened, so that the main battery pack can continuously supply power to the load unit; meanwhile, the voltage of the secondary battery pack cannot flow into the primary battery pack in the reverse direction through the body diode. The signal conversion N-MOS tube (Q4) adopts a common connection method to judge whether the main battery pack has continuous output, and if so, the large-current P-MOS tube (Q1) is started and further started.
Similarly, two large-current P-MOS tubes are arranged in the power supply loop of the secondary battery pack, the large-current P-MOS tube (Q2) close to the secondary battery pack is also reversely connected with the source electrode and the drain electrode, the high voltage is conducted to the source electrode of the Q2 firstly by utilizing the characteristic of the body diode, then the Q2 is completely opened, and the voltage of the primary battery pack can not flow into the secondary battery pack from the body diode (Q2) when the primary battery pack and the secondary battery pack exist. The other large-current P-MOS tube (Q3) is used for completely closing the power supply loop of the auxiliary battery pack when the main battery pack exists, so that partial power supply of the auxiliary battery pack when the voltage of the main battery pack is lower can not be generated. The PNP triode (Q6) of the power supply loop of the auxiliary battery pack is used for completely closing two large-current P-MOS tubes (Q2, Q3) of the power supply loop of the auxiliary battery pack when the signal conversion N-MOS tube (Q5) detects the existence of the main battery pack.
The voltage dividing resistor of the power supply loop of the main battery pack and the auxiliary battery pack generates proper MOS tube driving voltage through voltage division, so that each MOS works under the condition of optimal driving voltage, and the battery pack with different voltage values can be adapted through adjusting the resistance value of the voltage dividing resistor. For example: the voltage of the 3-string battery pack is 9-12.6V, the voltage of the 7-string battery pack is 21-29.2V, the voltage of the 10-string battery pack is 30-42V, and the like.
In the circuit embodiment of the invention, when the main battery pack exists, the main battery pack is completely powered, and the power supply loop of the auxiliary battery pack is completely closed, so that the voltage of the main battery pack does not flow to the auxiliary battery pack to charge the auxiliary battery pack, and the auxiliary battery pack does not supply power to a load or charge the main battery pack. Correspondingly, when the main battery pack cannot supply power due to various factors (such as under-voltage protection, disassembly, damage and the like), the auxiliary battery pack can seamlessly switch and start the two large-current P-MOS tubes, so that the power supply to the load is continuously recovered, and the voltage of the auxiliary battery pack can be prevented from flowing to the main battery pack. The reverse connection method of the source electrode and the drain electrode of the high-current P-MOS tube is skillfully used, so that almost no voltage drop from the battery pack voltage to the load unit can be ensured, and the possibility of mutual reverse charging of the battery pack voltage is also isolated.
The specific embodiment of the invention also provides a multi-path power supply switching method, which is realized based on the circuit of the invention and comprises the following steps:
step 1: the first reverse P-MOS tube (Q1) responds to continuous output of the main power supply through the first N-MOS tube (Q4) and is communicated with a power supply loop between the main power supply and the load unit. Namely: when the voltage of the main battery pack is connected to the voltage connection of the main battery pack, the voltage division of the resistors R5 and R6 can drive the Q4 to be turned on, meanwhile, the voltage of the main battery pack reaches the source electrode of the Q1 through the body diode of the Q1, after the voltage passes through the Q4 which is turned on after the voltage of the main battery pack is R1 and R2, the Q1 can be further driven to be completely turned on, and almost all the voltage of the main battery pack has no loss and flows to the load for use.
Step 2: the PNP triode (Q6) responds to the continuous output of the main power supply through the second N-MOS tube (Q5) and is in a conducting state. The second reverse P-MOS tube (Q2) and the forward P-MOS tube (Q3) respond to the continuous output of the main power supply through the PNP triode (Q6) in a conducting state, and disconnect the power supply loop between the auxiliary power supply and the load unit and the main power supply. Namely: regardless of whether the secondary battery pack has voltage or not, and regardless of the voltage of the secondary battery pack, as long as the voltage of the main battery pack is connected, the voltage of the main battery pack can drive the Q5 to be started through the partial pressure of R7 and R8. After Q5 is started, the Q6 triode can be conducted, and further the two P-MOS tubes (Q2 and Q3) of the power supply loop of the secondary battery pack are completely closed. Therefore, the voltage of the auxiliary battery pack cannot flow to the load unit and the main battery pack, and meanwhile, the voltage of the main battery pack cannot flow to the auxiliary battery pack.
Step 3: the PNP triode (Q6) responds to the output interruption of the main power supply through the second N-MOS tube (Q5) and is in a closed state; the second reverse P-MOS (Q2) and the forward P-MOS tube (Q3) are connected with a power supply loop between the auxiliary power supply and the load unit through a PNP triode (Q6) in a closed state in response to output interruption of the main power supply. Namely: if the main battery pack cannot supply power at a certain moment, the voltage division driving Q4 cannot be provided by R5 and R6, so that voltage division cannot be formed on R1 and R2, and Q1 is always in an off state, and then the voltage of the auxiliary battery pack cannot flow to the main battery pack. Meanwhile, R7 and R8 cannot provide the voltage division driving Q5, and the Q5 is kept in a closed state all the time, so that the base electrode and the collector electrode of the Q6 cannot form a loop, and the Q6 is kept in the closed state. After Q6 is closed, the voltage of the secondary battery pack passes through the body diode of Q2, and then partial pressure is formed on R3 and R4, so that two P-MOS tubes of Q2 and Q3 are further completely opened. Therefore, the secondary battery pack is seamlessly switched, and the power supply to the load is quickly restored. And since the P-MOS is fully on, there is hardly any loss in the voltage of the sub-battery to the load.
By the method, a power supply circuit and a switching circuit of the main battery pack and the auxiliary battery pack are realized, and the possibility of mutual reverse charging between the main battery pack and the auxiliary battery pack is isolated. It should be noted that, in this embodiment, the battery pack with 9v to 12.6v is mentioned, and other voltages may be used in actual use, so long as a corresponding voltage dividing resistance value is properly adjusted. In addition, the auxiliary battery packs of the embodiment generally have one group, but more auxiliary battery packs can be provided, and as shown in fig. 2, the auxiliary battery packs are improved schematic diagrams of the three-battery pack power supply switching circuit of the embodiment of the invention. The same principle can be improved to a power supply switching circuit supporting more sub-battery packs, and the working principle of the power supply switching circuit is similar, and the description is omitted here.
In summary, the circuit and the method of the invention skillfully utilize the body diode characteristic of the reverse P-MOS transistor, and a reverse P-MOS transistor with a source electrode and a drain electrode which are reversely connected is respectively connected into the main battery pack power supply loop and the auxiliary battery pack power supply loop. When the main power supply continuously supplies power, the first reverse P-MOS tube responds to the continuous output of the main power supply through the first N-MOS tube and is communicated with a power supply loop between the main power supply and the load unit; the second reverse P-MOS tube and the forward P-MOS tube respond to the continuous output of the main power supply through the PNP triode in the on state, and disconnect the power supply loop between the auxiliary power supply and the load unit and the main power supply. When the power supply of the main power supply is interrupted, the second reverse P-MOS tube and the forward P-MOS tube respond to the output interruption of the main power supply through the PNP triode in the off state and are communicated with a power supply loop between the auxiliary power supply and the load unit. Compared with the prior art, the circuit and the method of the invention adopt a reverse P-MOS tube mode to build the circuit, thereby not only saving the cost of devices such as the anti-backflow diode and the like, but also ensuring that the voltage of the battery pack has almost no voltage drop to the load; the hardware condition that the main power supply and the auxiliary power supply are not regulated can be supported, and the possibility of mutual and inverse charging between the two voltage sources is isolated.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (5)
1. The multipath power supply switching circuit is characterized by comprising a first reverse P-MOS tube Q1 connected between a main power supply and a load unit, a second reverse P-MOS tube Q2 connected between a secondary power supply and the load unit, wherein the second reverse P-MOS tube Q2 is electrically connected with the load unit through a forward P-MOS tube Q3, and the sources of the first reverse P-MOS tube Q1 and the second reverse P-MOS tube Q2 are reversely connected with a drain;
The grid electrode of the first reverse P-MOS tube Q1 is grounded through the control of the first N-MOS tube Q4, the second reverse P-MOS tube Q2 and the source electrode of the positive P-MOS tube Q3 are electrically connected with the grid electrodes of the second reverse P-MOS tube Q2 and the positive P-MOS tube Q3 through a PNP triode Q6, the base electrode of the PNP triode Q6 is electrically connected with the drain electrode of the second N-MOS tube Q5, the source electrode of the second N-MOS tube Q5 is grounded, and the grid electrode of the second N-MOS tube Q5 is electrically connected with a main power supply;
The main power supply unit power supply loop comprises a large-current P-MOS tube Q1, a signal conversion N-MOS tube Q4 and four voltage dividing resistors R1, R2, R5 and R6; the auxiliary power supply unit power supply loop comprises two large-current P-MOS transistors Q2 and Q3, a signal conversion N-MOS transistor Q5, five voltage dividing resistors R3, R4, R7, R8 and R9 and a PNP triode Q6;
In the three large-current P-MOS tubes, the Q1 and Q2 are connected with a normal circuit in opposite directions, and a connection method that the source electrode and the drain electrode are reversely connected is adopted;
q1 is a first reverse P-MOS tube, Q2 is a second reverse P-MOS tube, Q3 is a forward P-MOS tube, Q4 is a first N-MOS tube, and Q5 is a second N-MOS tube;
The first reverse P-MOS transistor Q1 is connected between the main power supply group and the load unit, the drain electrode of the first reverse P-MOS transistor Q1 is connected with the main power supply group, the source electrode of the first reverse P-MOS transistor Q1 is connected with the load unit, and the grid electrode of the first reverse P-MOS transistor Q1 is grounded through the control of the first N-MOS transistor Q4;
The second reverse P-MOS tube Q2 and the positive P-MOS tube Q3 are connected in series between the auxiliary power supply group and the load unit, wherein the second reverse P-MOS tube Q2 is connected between the auxiliary power supply group and the positive P-MOS tube Q3;
The second reverse P-MOS transistor Q2 and the source electrode of the positive P-MOS transistor Q3 are connected with the emitter electrode of the PNP triode Q6, the grid electrodes of the second reverse P-MOS transistor Q2 and the positive P-MOS transistor Q3 are connected with the collector electrode of the PNP triode Q6, the base electrode of the PNP triode Q6 is connected with the drain electrode of the second N-MOS transistor Q5, the source electrode of the second N-MOS transistor Q5 is grounded, and the grid electrode of the second N-MOS transistor Q5 is connected with a main power supply group;
the emitter of the PNP triode Q6 is electrically connected with the sources of the second reverse P-MOS tube Q2 and the forward P-MOS tube Q3, and the collector of the PNP triode Q6 is electrically connected with the gates of the second reverse P-MOS tube Q2 and the forward P-MOS tube Q3;
The source electrode of the first reverse P-MOS transistor Q1 is connected to the load side, the drain electrode is connected to the main battery side, the source electrode of the second reverse P-MOS transistor Q2 is connected to an element near the load side, the drain electrode is connected to the sub-battery side, the source electrode of the forward P-MOS transistor Q3 is connected to an element near the sub-battery side, the drain electrode is connected to the load side, and the R4 resistor is a bias resistor of the second reverse P-MOS transistor Q2 and the forward P-MOS transistor Q3, and the connection manner is as follows: one end is positioned between the sources of Q2 and Q3, and the other end is positioned at the grid of Q2 and Q3.
2. The multi-channel power supply switching circuit according to claim 1, wherein the main power supply or/and the auxiliary power supply is a non-stabilized voltage power supply.
3. The multi-channel power supply switching circuit of claim 2, wherein the unregulated power source comprises a battery pack.
4. A multi-channel power supply switching method, characterized in that the method is implemented based on the multi-channel power supply switching circuit according to any one of claims 1 to 3, comprising the steps of:
the first reverse P-MOS tube Q1 responds to the continuous output of the main power supply through the first N-MOS tube Q4 and is communicated with a power supply loop between the main power supply and the load unit;
The PNP triode Q6 responds to continuous output of a main power supply through the second N-MOS tube Q5 and is in a conducting state;
the second reverse P-MOS transistor Q2 and the forward P-MOS transistor Q3 respond to the continuous output of the main power supply through the PNP triode Q6 in a conducting state, and a power supply loop between the auxiliary power supply and the load unit and the main power supply is disconnected;
When the main power supply group continuously outputs, the Q1 conducts high voltage to the source electrode of the Q1 through the body diode characteristic of the P-MOS tube, and then the Q1 is completely opened, so that the main battery group continuously supplies power to the load unit, and meanwhile, the voltage of the auxiliary battery group cannot reversely flow into the main battery group through the body diode;
the signal conversion N-MOS transistor Q4 adopts a common connection method to judge whether the main battery pack has continuous output, if so, the high-current P-MOS transistor Q1 is started and further started;
Similarly, two large-current P-MOS tubes are arranged in the power supply loop of the secondary battery pack, the large-current P-MOS tube Q2 close to the secondary battery pack is reversely connected with the source electrode and the drain electrode, the high voltage is conducted to the source electrode of the Q2 firstly by utilizing the characteristic of the body diode, then the Q2 is completely opened, and the voltage of the primary battery pack can not flow into the secondary battery pack from the body diode Q2 when the primary battery pack and the secondary battery pack exist;
the other large-current P-MOS tube Q3 is used for completely closing the power supply loop of the auxiliary battery pack when the main battery pack exists, so that partial power supply of the auxiliary battery pack can not occur when the voltage of the main battery pack is lower;
the PNP triode Q6 of the auxiliary battery pack power supply loop is used for completely closing the two large-current P-MOS transistors Q2 and Q3 of the auxiliary battery pack power supply loop when the signal conversion N-MOS transistor Q5 detects the existence of the main battery pack.
5. The multi-channel power supply switching method according to claim 4, further comprising:
the PNP triode Q6 responds to the output interruption of the main power supply through the second N-MOS tube Q5 and is in a closed state;
The second reverse P-MOS transistor Q2 and the forward P-MOS transistor Q3 are connected with a power supply loop between the auxiliary power supply and the load unit through the PNP triode Q6 in a closed state in response to output interruption of the main power supply.
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| CN113131606A (en) * | 2021-05-20 | 2021-07-16 | 浙江航芯科技有限公司 | Low-power consumption major-minor power supply automatic switching circuit |
| CN113437794B (en) * | 2021-06-30 | 2024-11-01 | 华勤技术股份有限公司 | Multi-path power supply selection system and electronic equipment |
| CN114189040A (en) * | 2021-11-30 | 2022-03-15 | 福州物联网开放实验室有限公司 | Dual-power switching circuit and power supply equipment |
| CN114172253A (en) * | 2021-12-21 | 2022-03-11 | 上海智汇电器有限公司 | Multi-battery pack seamless switching circuit |
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