CN110504747B

CN110504747B - Battery buckle plate, power supply device and power supply method

Info

Publication number: CN110504747B
Application number: CN201910787951.0A
Authority: CN
Inventors: 朱晓晖; 陈平
Original assignee: Swit Electronics Co Ltd
Current assignee: Swit Electronics Co Ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2021-08-13
Anticipated expiration: 2039-08-26
Also published as: CN110504747A

Abstract

The invention discloses a battery pinch plate, wherein a hot switching control circuit is arranged in the pinch plate, and a power supply input interface is arranged on the pinch plate; the intelligent power supply comprises a power switch, a current unidirectional circulation control circuit, a hot switching forced opening circuit and an MCU (microprogrammed control Unit) enabling circuit, wherein the current unidirectional circulation control circuit is arranged on a power output circuit and used for realizing unidirectional flow of current, the MCU enabling circuit is respectively connected with the power switch and the hot switching forced opening circuit, the hot switching forced opening circuit is also connected with a power input interface, and the MCU enabling circuit controls the on-off of the power switch according to an enabling signal EN-Bn. The invention realizes the power supply of the high-power electric equipment and can supply power uninterruptedly for a long time; when the multi-stage power supply is input, any hot plug of the power supply can be realized, and the reliability is high.

Description

Battery buckle plate, power supply device and power supply method

Technical Field

The invention relates to the field of equipment powered by an external power supply, in particular to a battery buckle plate, a power supply device and a power supply method.

Background

From film to the digital age, the development of photographic equipment has driven the development of photographic accessories. In modern cameras, the battery almost becomes an indispensable part of the camera. The cruising ability of the battery is also changed and upgraded, and the battery also undergoes a revolution of updating. The battery is used as an energy source, so that the current which has stable voltage and current, is stably supplied for a long time and is slightly influenced by the outside can be obtained, the structure of the battery is simple, the battery is not influenced by the outside climate and the temperature, and the performance is stable and reliable.

The demand of the external power supply equipment on the power supply is mainly embodied in two aspects, namely, a large-capacity power supply is needed to ensure that the equipment can supply power uninterruptedly for a long time; and secondly, a high-power supply is required to meet the power supply requirement of high-power equipment. At present, a V-port battery, an A-port battery and a DV battery are mainly adopted in the film and television photography industry to supply power to equipment, the dangerousness of the batteries is increased no matter the capacity or the power of the batteries is increased, the high-power batteries are easily limited during transportation, particularly the high-power batteries cannot be consigned due to the limitation of air transportation, and the high-power batteries are very inconvenient in actual use. In the existing products in the market, a plurality of groups of batteries are connected with each other to meet the high-power or high-capacity requirements, and the single requirements of the high-capacity batteries or the high-power batteries can be met, so that the universality of the products is poor.

Chinese patent application discloses a power supply unit of dual power supply, No. CN209029981U, 6 months 25 of 2019 of bulletin date, power supply unit of dual power supply is disclosed, power supply unit includes power pack, buckle and battery, power pack includes at least one direct current input end and direct current output end, buckle fixed connection is on power pack, the battery passes through the buckle with the power pack electricity is connected. The device overcomes the defect that the existing external power supply device cannot guarantee continuous power supply, can automatically switch the power supply in a non-power-off state so as to ensure that the work is not interrupted while the battery is replaced, and the power supply switching is the switching power supply between direct current and the battery, is not suitable for the thermal switching between the batteries and is not easy to carry; and the circuit does not have power detection and quick turn-off module, can't adapt to the matched power supply automatically, the switch accumulates the electric charge easily and causes the equipment trouble in the power switching process, the reliability is low.

Disclosure of Invention

1. Technical problem to be solved

The invention provides a battery buckle plate which can realize that power supply of other power supplies can not be continuously connected at the moment when the power supply is removed, aiming at the problem that other power supplies can not be immediately opened after the power supply which is supplying power is disconnected when multiple power supplies in the prior art work.

2. Technical scheme

According to the battery buckle plate provided by the invention, the buckle plate is internally provided with the hot switching control circuit, and the buckle plate is provided with the power input interface; the power supply comprises a power switch, a current unidirectional circulation control circuit, a hot switching forced opening circuit and an MCU (microprogrammed control Unit) enabling circuit, wherein the current unidirectional circulation control circuit is arranged on a power output circuit and used for realizing unidirectional flow of current; when the battery pinch plate supplies power, when the power cannot be normally supplied, the hot switching forced open circuit outputs signals to an MCU enabling circuit of a power supply hot switching circuit for controlling other battery pinch plates; when the power supply is not supplied by the battery pinch plate and the power switch is disconnected, the MCU enabling circuit receives a signal output by a hot switching forced opening circuit for controlling the power supply hot switching circuits of other battery pinch plates, and the power switch is opened.

The battery buckle is connected with the power supply in an inserted mode, the power supply is connected with the power supply input interface, and the current one-way circulation control circuit is used for achieving one-way flowing of current, so that the situation that the power supply with high voltage charges the power supply with low voltage when multiple power supplies supply power simultaneously is avoided, and the current backflow is avoided. The invention detects whether the power supply normally supplies power by utilizing the hot switching forced open circuit, once the power supply cannot normally supply power, if the voltage is too low, or the power supply is dismantled, the hot switching forced open circuit outputs a signal Fn to the MCU enabling circuits of other power supplies, the MCU enabling circuits of other power supplies open the power switches of the corresponding power supplies, and the other power supplies play a role in temporarily supplying power, thereby realizing the hot switching of the power supplies and avoiding power failure.

Further, the hot-switch forced-on circuit includes transistor QAn1 and transistor QAn 2; the base electrode of the triode QAn1 is connected with the power Bn, the emitter electrode is grounded, and the collector electrode is connected with the base electrode of the triode QAn 2; the emitter of the triode QAn2 is grounded, the base is connected with an enable signal EN-Bn, and the collector outputs a signal to the MCU enable circuit of the power supply hot switching circuit for controlling other battery pinch plates. When the voltage of the power supply is too low to effectively supply power or the power supply is removed, so that normal power supply cannot be realized, the enable signal EN-Bn still has a high level because the MCU does not react in time, at the moment, the base electrode of the triode QAn1 is at a low level, the collector electrode is at a high level, the triode QAn1 is cut off, the triode QAn2 is opened, the triode QAn2 outputs a low level to MCU enable circuits of other power supplies, and the MCU enable circuits of other power supplies open power switches of the corresponding power supplies; when the power supply is normally powered, the transistor QAn1 is turned on, the transistor QAn2 is turned off, and the output signal Fn is in a high impedance state.

Furthermore, the hot-switching forced opening circuit further comprises at least one diode, the anodes of the diodes are respectively connected with the MCU enabling circuit, and the cathode of the diode receives a signal for controlling the output of the hot-switching forced opening circuit of the power supply hot-switching circuit of the other battery pinch plate. The signal from the collector of transistor QAn2 of the hot-switch forced-on circuit from the other power source is passed through a diode and fed to the MCU enable circuit.

Furthermore, the MCU enabling circuit comprises an NMOS tube Qn5, a PMOS tube Qn 4; the source electrode of the NMOS tube Qn5 is grounded, the grid electrode is connected with an enable signal EN-Bn, the drain electrode is connected with the grid electrode of the PMOS tube Qn4, and the NMOS tube Qn5 receives a signal output by a hot switching forced opening circuit of a power supply hot switching circuit for controlling other battery pinch plates; the drain electrode of the PMOS tube Qn4 is connected with the power switch, the source electrode is connected with a signal GDrive, and the signal GDrive is obtained by boosting the voltage of a power supply Bn. The driving voltage of the MCU enabling circuit is GDrive, and in order to satisfy the driving condition, the GDrive signal needs to be sufficiently larger than the input power Bn, so the power is boosted and then connected to the MCU enabling circuit for driving. When the enable signal EN-Bn is at high level, the NMOS transistor Qn5 and the PMOS transistor Qn4 are both turned on, and the power switch is turned on because the driving voltage GDrive of the MCU enable circuit is boosted and is greater than the power voltage.

Furthermore, the power switch is a MOSFET transistor Qn2, the gate of the MOSFET transistor Qn2 is connected to the drain of the PMOS transistor Qn4, the source is used as the output and is connected to the load, and the drain is connected to the power input interface.

Furthermore, the quick turn-off circuit comprises a MOSFET tube Qn3, wherein the grid electrode of the MOSFET tube Qn3 is connected with the drain electrode of the NMOS tube Qn5, the drain electrode is connected with the grid electrode of the MOSFET tube Qn2, and the source electrode is connected with the source electrode of the power switch. When any power MOSFET is driven to be turned off, the turn-off time of a leakage resistor between G and S (grid electrode and source electrode) is short enough, and the MOSFET is easy to be damaged accidentally, so that a small-signal MOSFET is connected in parallel at the G-S leakage resistor, and the triggering mode is that when the MCU enabling circuit is enabled to be turned off, the small-signal MOSFET is turned on to rapidly turn off the power switch MOSFET.

Still further, the hot-switch forced-on circuit includes transistor QAn1, transistor QAn2, and at least one diode; the base electrode of the triode QAn1 is connected with the power input interface, the emitter electrode is grounded, and the collector electrode is connected with the base electrode of the triode QAn 2; the emitting electrode of the triode QAn2 is grounded, the base electrode is connected with an enable signal EN-Bn, and the collector electrode outputs a signal to an MCU enable circuit of a power supply hot switching circuit for controlling other battery pinch plates; the positive electrodes of the diodes are respectively connected with the drain electrodes of the NMOS tubes Qn5, and the negative electrodes of the diodes receive signals output by a hot switching forced opening circuit of a power supply hot switching circuit for controlling other battery pinch plates.

Furthermore, the current one-way circulation control circuit is a diode, an ideal diode circuit or an anti-reverse-flow circuit.

Furthermore, the current one-way circulation control circuit is arranged between the power input interface and the power switch and is respectively connected with the power input interface and the power switch.

Furthermore, the ideal diode circuit comprises an NMOS tube Qn1 and an ideal diode control chip Un, wherein the source electrode of the NMOS tube Qn1 is connected with the power input interface and the IN pin of the ideal diode control chip Un, the GATE electrode of the NMOS tube Qn1 is connected with the GATE pin of the ideal diode control chip Un, the drain electrode of the NMOS tube Qn1 is connected with the power switch, the OUT pin and the VS pin of the ideal diode control chip Un, and the OFF pin and the GND pin of the ideal diode chip Un are grounded.

Still further, the power input interface is provided with a power detection circuit for detecting current.

The invention also provides a power supply device which comprises n battery pinch plates provided by the invention, and for any battery pinch plate, the output signal of the hot switch control circuit of the battery pinch plate is connected to the MCU enabling circuit of the hot switch control circuits of other battery pinch plates.

The invention also discloses a power supply method, when only one power supply is available, the power supply supplies power; when a plurality of power supplies are available and the load is not connected, the power supply with the highest priority supplies power; when a plurality of power supplies are connected with a load externally, if the current of the load is less than the rated current of part of the power supplies, the power supply with the highest priority in the power supplies with the rated current greater than the load current is used for supplying power, and if the power supply cannot normally supply power in the power supply process, the temporary power supply of other power supplies is immediately switched; when a plurality of power supplies are connected with the external load, if the load current is larger than the rated current of a single power supply, the plurality of power supplies supply power simultaneously.

Further, if the power supply can not normally supply power in the power supply process, temporary power supply by other power supplies is immediately switched, specifically, a hot-switching forced open circuit corresponding to the currently supplied power supply detects that normal power supply can not be performed, the hot-switching forced open circuit outputs a signal Fn to MCU enabling circuits of other power supplies, the MCU enabling circuits of other power supplies open power switches corresponding to the power supplies, one or more temporary power supplies of other power supplies are used until the currently supplied power supply recovers normal power supply, or the MCU enabling circuits of corresponding power supplies receive enabling signals for opening the power switches, the MCU enabling circuits open the power switches of corresponding power supplies, and the corresponding power supplies supply supplies power.

Furthermore, when the currently-supplied power supply cannot supply power normally, the power supply with high voltage in other power supplies is used for supplying power temporarily. When the voltage of the working power input is suddenly reduced due to faults, pulling-out and the like, the power circuits of all other paths can be opened after the hot switching forced opening circuit is triggered to work. The invention can be provided with an ideal diode circuit, under the action of the ideal diode circuit, power is temporarily supplied according to the voltage, the power-driven equipment damage caused by the power supply of all power supplies can not be caused, and the reliability of the circuit is high.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

the multi-power supply intelligent power supply scheme simultaneously meets the requirements of uninterrupted power supply and high-power supply, and enlarges the application range of a power supply system; the power detection circuit detects the power of the electric equipment, and intelligently judges the power supply mode of the power supply: when the load power of the equipment is larger than the maximum output power of a single power supply, the power supply mode is automatically switched to the power supply simultaneous supply mode through the power supply control function of the power supply. When a circuit is suddenly unplugged because a certain stage of power supply or the input voltage is reduced due to a fault, the circuit can not continuously maintain power supply, the circuit is forcibly switched on by hot switching to output signals, other power supplies are immediately triggered to be switched on temporarily to maintain normal power supply of equipment, and the total output can be continuously uninterrupted as long as at least the rest stage of power supply is input into the multi-stage power supply in the circuit; the circuit has high reliability, when the MCU enabling circuit closes the current level power circuit, the gate-source electrode capacitor of the MOSFET switch of the circuit is quickly released by using the quick turn-off circuit, the response speed is extremely quick, the damage of the MOSFET switch of the power supply is difficult to cause, and meanwhile, the quick turn-off is realized, so that the reliability of the circuit is improved; all switching is circuit intelligent switching, and manual operation is not needed.

Drawings

FIG. 1 is a perspective view of a two-way power channel power supply of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a front elevational view of a two-channel power supply of the present invention;

FIG. 4 is a bottom elevation view of a two-channel power supply of the present invention;

FIG. 5 is a perspective view of a power supply assembly of the present invention with multiple power paths;

FIG. 6 is a system block diagram of the power supply circuit of the present invention;

FIG. 7 is a schematic circuit diagram of a first stage power input of the present invention;

FIG. 8 is a schematic circuit diagram of a second stage power input of the present invention;

FIG. 9 is a simplified electrical schematic of the third stage power source input of the present invention;

FIG. 10 is a schematic circuit diagram of the nth stage power input of the present invention;

FIG. 11 is a simplified GDrive signal diagram according to the present invention;

FIG. 12 is a diagram of the transistor connection in the hot-switch forced-on circuit of the present invention;

FIG. 13 is a circuit diagram of the output signal of the hot-switch forced-on circuit of the present invention.

The reference numbers in the figures illustrate:

1. a V-LOCK input interface; 2. a D-TAP output port; 3. and a V-LOCK output interface.

Detailed Description

The invention is described in detail below with reference to the drawings and specific examples.

As shown in fig. 1 to 4, the power supply device is composed of two battery buckle plates, two V-LOCK input interfaces 1 (for mounting a battery, and the battery output is connected with the V-LOCK input interfaces), two D-TAP output ports 2 and one V-LOCK output interface 3 are arranged on the power supply device, and as shown in fig. 2, the D-TAP output ports 2 have positive and negative poles. The output modes and the output voltages of the D-TAP output port 2 and the V-LOCK output interface 3 are the same, and power is supplied to another interface access device of a user.

As shown in figure 5, the power supply device is composed of a plurality of battery buckle plates, wherein the battery buckle plates are not provided with a V-LOCK output interface 3, and only one battery buckle plate is provided with a D-TAP output port 2. The power supply device is provided with a first-stage V-LOCK input interface 1, a second-stage V-LOCK input interface 1, a third-stage V-LOCK input interface 1, an nth-stage V-LOCK input interface 1 and two D-TAP output ports 2.

The power supply logic of the power supply device of the invention is as follows:

(1) when the battery buckle plate is only used for mounting a single-path battery, the battery is directly used for outputting; the MCU judges the load capacity of the current battery and can perform overcurrent protection in advance;

(2) when the battery buckle plate is used for mounting a plurality of batteries and no equipment is mounted, opening a passage of a battery with the highest priority according to the priority, for example, opening a passage of a battery with a lower voltage preferentially according to the voltage sequence;

(3) when the battery buckle plate is used for mounting a plurality of batteries and the current of the loaded equipment is detected to be smaller than the rated current of a single battery, the passage of the battery with the highest priority is opened according to the priority, for example, the passage with lower voltage is opened by default according to the voltage high and low sequence until the voltage of the battery is reduced to be below a certain threshold value, namely, the voltage is slightly higher than the lower limit of the allowable input of the power supply, and the passage of the other battery is automatically switched; if the discharging battery is pulled out, the battery is immediately switched to another path, and the output is uninterrupted;

(4) when the battery buckle plates are used for mounting a plurality of batteries and the current of the loaded equipment is detected to be larger than the rated current of a single battery, the multipath channels are opened immediately, so that the batteries are output outwards at the same time. But in this state the customer needs to use a battery with similar remaining capacity.

The following description is directed to a power supply in place of a battery clip.

As shown in FIG. 6, there are n stages of power inputs, the first stage B1, the second stage B2, the third stage B3, …, and the nth stage Bn. Each stage of power supply is connected with the power switch through a current one-way circulation control circuit, the current one-way circulation control circuit is used for realizing one-way flow of current, the current one-way circulation control circuit can be arranged between the power supply and the power switch and also can be arranged at other positions of an output circuit of the power supply, and the current one-way circulation control circuit shown in fig. 6 is an ideal diode circuit. The power supply circuit further comprises an MCU enabling circuit, a hot-switching forced opening circuit and a quick turn-off circuit, wherein the MCU enabling circuit is respectively connected with the power switch, the hot-switching forced opening circuit and the quick turn-off circuit, the quick turn-off circuit is also connected with the power switch, and the quick turn-off circuit shown in the figure 6 is an MOSFET tube. Taking power supply B1 as an example, MCU selects power supply B1 and outputs high level to MCU enabling circuit, MCU enabling circuit opens switch, power supply B1 supplies power to the outside, when power supply B1 is dismantled or breaks down or the voltage is too low, power supply B1 can't normally work, the hot switch forces to open circuit output signal F1 and gives the MCU enabling circuit of other powers, the MCU enabling circuit of other powers opens switch of corresponding power (although MCU does not output high level enabling signal and gives the MCU enabling circuit of corresponding power), realize temporary power supply. Under the condition that power supply B1 normally supplies power, if power supply B1 stops supplying power, MCU output low level gives MCU enabling circuit, and MCU enabling circuit cuts off switch, and quick turn-off circuit can realize switch's quick turn-off.

The ideal diode has the function of preventing reverse filling, and solves the problem that a high-voltage power supply charges a low-voltage power supply in a sequential power supply mode of the power supply or when power supplies with different electric quantities are simultaneously connected. Meanwhile, unidirectional input is realized, the electric equipment is prevented from being damaged by reverse connection of a power supply, and the electric equipment is protected. Because the ideal diode circuit has no voltage drop and low power consumption, the ideal diode circuit is used as the current one-way circulation control circuit in the embodiment. The current one-way circulation control circuit can also adopt a diode or an anti-reverse-flow circuit.

As shown in fig. 7 to 10, the power inputs are B1, B2, B3, …, Bn in sequence, and the total output is VOUT. In order to ensure the unidirectional input of the power supplies, after the power supplies B1, B2 and B3 … … Bn are input, the power supplies need to pass through a diode or an ideal diode circuit or an anti-reverse-flow circuit, preferably an ideal diode circuit, and the loss of the circuit is low. The ideal diode circuit comprises an NMOS tube and an ideal diode control chip, wherein Q11, Q21, Q31, … … and Qn1 are NMOS tubes, and U1, U2, U3, … … and Un are ideal diode control chips. The power switch is MOSFET tubes Q12, Q22, Q32, … … and Qn 2; the MCU enabling signals are EN-B1, EN-B2, EN-B3, … … and EN-Bn.

Taking the nth stage circuit as an example, as shown IN fig. 10, the ideal diode circuit includes an NMOS transistor Qn1 and an ideal diode control chip Un, the source of the NMOS transistor Qn1 is connected to the power Bn and the IN pin of the ideal diode control chip Un, the GATE of the NMOS transistor Qn1 is connected to the GATE pin of the ideal diode control chip Un, the drain of the NMOS transistor Qn1 is connected to the drain of the power switch MOSFET Qn2, the OUT pin and the VS pin of the ideal diode control chip Un, the OFF pin and the GND pin of the ideal diode chip Un are grounded, a resistance current stabilizer is connected between the VS pin and the OUT pin of the ideal diode control chip Un, and a capacitor is connected between the VS pin and GND of the ideal diode control chip Un to protect the circuit. The MCU enabling circuit comprises an NMOS tube Qn5 and a PMOS tube Qn 4; the source electrode of the NMOS tube Qn5 is grounded, the grid electrode is connected with an enable signal EN-Bn, the enable signal is provided by the MCU, the drain electrode is connected with the grid electrode of the PMOS tube Qn4 through a resistor Rn3, the drain electrode is also connected with the output signal Fn of the hot switching forced opening circuit of other power supplies (B1, B2, B3, … … and Bn-1), and the drain electrode is connected with the quick closing circuit through a resistor Rn 4; the drain electrode of the PMOS tube Qn4 is connected with the grid electrode of the power switch MOSFIT tube Qn2, the source electrode is connected with a signal GDrive through a diode Dn1A, the diode Dn1A realizes unidirectional conduction, and the signal GDrive is obtained by boosting the voltage of a power supply Bn. A resistor Rn2 and a bidirectional TVS diode are connected in parallel between the grid and the source of the PMOS tube Qn4, and the resistor Rn2 and the bidirectional TVS diode limit the current of the circuit and protect the circuit. The fast turn-off circuit comprises a MOSFET tube Qn3, wherein the grid electrode of the MOSFET tube Qn3 is connected with the drain electrode of an NMOS tube Qn5 through a resistor Rn4, the drain electrode is connected with the grid electrode of the MOSFET tube Qn2, and the source electrode is connected with the source electrode of the MOSFET tube Qn 2. And a resistor Rn5 is connected between the drain and the source of the MOSFET tube Qn 2. The source of power switch MOSFET Qn2 is also connected to the total output VOUT as the output of power Bn.

As shown in fig. 12 and 13, 12(a) and 13(a) are hot-switching forced-on circuits corresponding to the power supply B1, 12(B) and 13(B) are hot-switching forced-on circuits corresponding to the power supply B2, 12(c) and 13(c) are hot-switching forced-on circuits corresponding to the power supply B3, and 12(d) and 13(d) are hot-switching forced-on circuits corresponding to the power supply Bn. The hot switching forced turn-on circuit comprises a transistor QAn1, a transistor QAn2 and n-1 diodes; the base electrode of the triode QAn1 is connected with the power Bn through resistors Rn9 and Rn6, the resistor Rn9 is also connected with the resistor Rn7, the resistor Rn7 is grounded, the emitter electrode of the triode QAn1 is grounded, and the collector electrode is connected with the base electrode of the triode QAn 2; the emitter of the triode QAn2 is grounded, and the base is connected with an enable signal EN-Bn of the power supply Bn, namely an enable signal provided by the MCU to the MCU enable circuit; the collector output signal Fn of the transistor QAn2 is provided to MCU enabling circuits of other power supplies (B1, B2, B3, … …, Bn-1), as shown in fig. 13(a), 13(B), 13(c), the collector output signal Fn of the transistor QAn2 forms signals Force1, Force2, Force3 through diodes D3, D9, D6 respectively, and is connected to MCU enabling circuits of the power supplies B1, B2, B3 respectively, that is, to the drains of NMOS transistors (Q15, Q25, Q35) of the MCU enabling circuits. Further, take the power Bn as an example to illustrate how the n-1 diodes are connected. Signals F1, F2, … … and Fn-1 from power supplies B1, B2, … … and Bn-1 are respectively connected with the cathodes of diodes D10, D11, … … and D12, and the anodes of diodes D10, D11, … … and D12 are connected with each other and then connected with an MCU enabling circuit of the power supply Bn, namely, the drain of an NMOS tube Qn5 of the MCU enabling circuit.

As shown in fig. 11, GDrive is a level signal of the power supply after boosting processing, and is used for driving voltage of the MCU enable circuit. In order to satisfy the driving condition, the GDrive signal needs to be sufficiently larger than the input power Bn. The n-stage power supplies B1, B2, B3, … and Bn are respectively connected with anodes of diodes (D13, D14, D15 and D16) and then connected in parallel, cathodes of the diodes (D13, D14, D15 and D16) are connected with an input end BIN of the boosting module, and GDrive is output through boosting.

The working principle of the present invention is described in detail below.

(1) The MCU selects the power supply priority of the plurality of batteries according to the requirements, and supposedly selects the priority of the power supply according to the voltage sequence of the batteries and the priority of the power supply with low voltage.

(2) When a plurality of batteries are mounted and the load equipment is arranged, the MCU performs A/D conversion on the current amplification values of the sampling resistors Rsns1, … … and Rsnsn to obtain the current of the load equipment, and then the current is compared with the rated current of the battery read by the MCU. Because the load power of the equipment is the output power of the power supply, the output current value of the power supply is sampled by using the power detection circuit to quickly identify.

1) If the current of the loaded device is detected to be less than the rated current of a single battery, the MCU only opens a path with lower voltage by default. The first-stage power supply B1 will be described as an example. The EN-B1 is an MCU enabling signal, when the MCU enabling circuit selects to be connected with a first power supply B1, the EN-B1 is at a high level, the NMOS transistor Q15 is opened, and the Force1 is at a low level. GDrive is high, and the PMOS transistor Q14 is turned on by the driving level GDrive. Since GDrive is sufficiently larger than B1, the power switching MOSFET transistor Q12 is turned on, and the current flows to B1 → VO1+ → VOUT; NMOS Q25, Q35, Qn5 are off, Force2, Force3 … … Force go high, MOSFETs Q22, Q32, Qn2 are off, and battery channels B2, B3 … … Bn are off.

Until the B1 voltage drops below a certain threshold (slightly above the power supply's allowable input lower limit).

In a short time, because the MCU is not ready to react, the EN-B1 is still in a high level, and the triodes QA11 and QA12 in the forced open circuit are subjected to hot switching to respond quickly. Since the EN-B1 is at a high level, the base of the B1 input transistor QA11 is at a low level, the hot switch open circuit transistor QA11 is turned off, QA12 is turned on, F1 is pulled to a low level, F1 pulls Force2, Force3, … …, Forcen to a low level under the action of diodes D7, D4, … …, D10, and further the PMOS transistors Q24, Q34, … …, Qn4 of the second stage circuit, the third stage circuit, … …, and the nth stage circuit are turned on, so as to drive the MOSFET switches Q22, Q32, … …, Qn2 of the corresponding power supply to be turned on, and all other power supply circuits are turned on forcibly. Under the action of the ideal diode circuit, the power supply with high voltage temporarily supplies power, and the state only lasts for a few seconds temporarily until the MCU changes EN-B1 to low level and pulls up the MCU enable signal of the next priority power supply circuit. After the MCU changes EN-B1 into low level, an NMOS tube Q15 is turned off, Force1 is changed into high level, Q14 is turned off, Q13 is turned on, a power MOSFET switch Q12 is turned off, and Q13 enables a gate-source capacitor Cgs of Q12 to be rapidly discharged, so that breakdown of a switch tube caused by charges is prevented, Q12 is guaranteed to be rapidly turned off, and the power MOSFET switch is protected. When the current power supply B1 works normally, the hot switch forces the QA11 in the open circuit to open, the QA12 is cut off, and the F1 is in a high-impedance state, so that MCU enabling circuits of other power supplies cannot be triggered to open corresponding power switches.

If the battery B1 is pulled out midway or a fault occurs, other battery paths are forced to be opened, the principle is the same, and therefore uninterrupted power supply is achieved.

The other stages have the same circuit structure and principle as the first stage. The input and output principles of the other stage power supplies are the same as those of the first stage power supply B1.

2) If the current of the loaded device is detected to be larger than the rated current of a single battery, the MCU simultaneously opens all channels of the detected battery, assuming that only two power supplies are provided, B1 and B2. The MCU pulls EN-B1 and EN-B2 to high level, NMOS transistors Q15 and Q25 are opened, and Force1 and Force2 are low level. Under the action of the driving level GDrive, the PMOS transistors Q14 and Q24 are opened. With GDrive large enough, MOSFETs Q12 and Q22 are turned on, and battery B1 and battery B2 are powered simultaneously. But in this state the customer needs to use two batteries with similar remaining capacities. Otherwise, under the action of an ideal diode circuit, the circuit can select power supply with high electric quantity, so that the loaded equipment cannot be started.

(3) When a plurality of batteries are mounted and no load equipment is mounted, equivalently the current of the load equipment is detected to be less than the rated current of a single battery, and only a battery passage with lower voltage is opened.

(4) When only the single-channel battery is mounted, the single-channel battery is directly output outwards; the MCU judges the loading capacity of the current battery and can perform overcurrent protection in advance.

The control mode of the invention is the same no matter two batteries are mounted or more batteries are mounted.

The invention and its embodiments have been described above schematically, without limitation, and the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The representation in the drawings is only one of the embodiments of the invention, the actual construction is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Claims

1. A battery buckle plate is provided with a hot switching control circuit inside, and a power input interface is arranged on the buckle plate; the method is characterized in that: the power supply comprises a power switch, a current unidirectional circulation control circuit, a hot switching forced opening circuit and an MCU (microprogrammed control Unit) enabling circuit, wherein the current unidirectional circulation control circuit is arranged on a power output circuit and used for realizing unidirectional flow of current; when the battery pinch plate supplies power, when the power cannot be normally supplied, the hot switching forced open circuit outputs signals to an MCU enabling circuit of a power supply hot switching circuit for controlling other battery pinch plates; when the power switch is disconnected instead of being powered by the battery pinch plate, the MCU enabling circuit receives a signal output by a hot switching forced opening circuit of a power hot switching circuit for controlling other battery pinch plates, and the power switch is opened;

the MCU enabling circuit comprises an NMOS tube Qn5 and a PMOS tube Qn 4; the source electrode of the NMOS tube Qn5 is grounded, the grid electrode is connected with an enable signal EN-Bn, the drain electrode is connected with the grid electrode of the PMOS tube Qn4, and the NMOS tube Qn5 receives a signal output by a hot switching forced opening circuit of a power supply hot switching circuit for controlling other battery pinch plates; the drain electrode of the PMOS tube Qn4 is connected with the power switch, the source electrode is connected with a signal GDrive, and the signal GDrive is obtained by boosting the voltage of a power supply Bn;

the power switch also comprises a quick turn-off circuit, wherein the quick turn-off circuit comprises a MOSFET tube Qn3, the grid electrode of the MOSFET tube Qn3 is connected with the drain electrode of the NMOS tube Qn5, the drain electrode is connected with the grid electrode of the MOSFET tube Qn2, and the source electrode is connected with the source electrode of the power switch.

2. The battery buckle plate according to claim 1, wherein: the hot-switch forced-on circuit includes transistor QAn1 and transistor QAn 2; the base electrode of the triode QAn1 is connected with the power Bn, the emitter electrode is grounded, and the collector electrode is connected with the base electrode of the triode QAn 2; the emitter of the triode QAn2 is grounded, the base is connected with an enable signal EN-Bn, and the collector outputs a signal to the MCU enable circuit of the power supply hot switching circuit for controlling other battery pinch plates.

3. The battery buckle plate according to claim 2, wherein: the hot switching forced opening circuit further comprises at least one diode, the anode of the diode is respectively connected with the MCU enabling circuit, and the cathode of the diode receives a signal output by the hot switching forced opening circuit for controlling the power hot switching circuits of other battery pinch plates.

4. The battery buckle plate according to claim 1, wherein: the power switch is a MOSFET tube Qn2, the grid electrode of the MOSFET tube Qn2 is connected with the drain electrode of the PMOS tube Qn4, the source electrode is used as output, and the drain electrode is connected with the power input interface.

5. The battery buckle plate according to claim 4, wherein: the hot-switch forced-on circuit includes a transistor QAn1, a transistor QAn2, and at least one diode; the base electrode of the triode QAn1 is connected with the power input interface, the emitter electrode is grounded, and the collector electrode is connected with the base electrode of the triode QAn 2; the emitting electrode of the triode QAn2 is grounded, the base electrode is connected with an enable signal EN-Bn, and the collector electrode outputs a signal to an MCU enable circuit of a power supply hot switching circuit for controlling other battery pinch plates; the positive electrodes of the diodes are respectively connected with the drain electrodes of the NMOS tubes Qn5, and the negative electrodes of the diodes receive signals output by a hot switching forced opening circuit of a power supply hot switching circuit for controlling other battery pinch plates.

6. The battery buckle plate according to any one of claims 1 to 5, wherein: the current one-way circulation control circuit is a diode, an ideal diode circuit or an anti-reverse-flow circuit.

7. The battery buckle plate according to claim 6, wherein: the current one-way circulation control circuit is arranged between the power input interface and the power switch and is respectively connected with the power input interface and the power switch.

8. The battery buckle plate according to claim 7, wherein: the ideal diode circuit comprises an NMOS tube Qn1 and an ideal diode control chip Un, wherein the source electrode of the NMOS tube Qn1 is connected with a power supply input interface and an IN pin of the ideal diode control chip Un, the grid electrode of the NMOS tube Qn1 is connected with a GATE pin of the ideal diode control chip Un, the drain electrode of the NMOS tube Qn1 is connected with the power supply switch and an OUT pin and a VS pin of the ideal diode control chip Un, and an OFF pin and a GND pin of the ideal diode chip Un are grounded.

9. The battery buckle plate of claim 8, wherein: the power input interface is provided with a power detection circuit for detecting current.

10. A power supply device, characterized by: the battery buckle plate comprises n battery buckle plates according to any one of claims 1 to 9, wherein for any battery buckle plate, an output signal of a hot switch control circuit of the battery buckle plate is connected to an MCU enabling circuit of a hot switch control circuit of other battery buckle plates.

11. A method of supplying power, comprising: a power supply device as claimed in claim 10, when there is only one power supply, the power is supplied by the power supply; when a plurality of power supplies are available and the load is not connected, the power supply with the highest priority supplies power; when a plurality of power supplies are connected with a load externally, if the current of the load is less than the rated current of part of the power supplies, the power supply with the highest priority in the power supplies with the rated current greater than the load current is used for supplying power, and if the power supply cannot normally supply power in the power supply process, the temporary power supply of other power supplies is immediately switched; when a plurality of power supplies are connected with the external load, if the load current is larger than the rated current of a single power supply, the plurality of power supplies supply power simultaneously;

if the power supply can not normally supply power in the power supply process, temporary power supply by other power supplies is immediately switched, specifically, a hot-switching forced open circuit corresponding to the currently supplied power supply detects that normal power supply can not be realized, the hot-switching forced open circuit outputs a signal Fn to MCU enabling circuits of other power supplies, the MCU enabling circuits of other power supplies open power switches corresponding to the power supplies, one or more temporary power supplies of other power supplies are used until the currently supplied power supply recovers normal power supply, or the MCU enabling circuits of corresponding power supplies receive enabling signals for opening the power switches, the MCU enabling circuits open the power switches of corresponding power supplies, and the corresponding power supplies supply supplies power.

12. The power supply method according to claim 11, characterized in that: when the power supply for current power supply can not supply power normally, the power supply with high voltage in other power supplies power temporarily.