CN215221758U

CN215221758U - Double-battery redundant circuit

Info

Publication number: CN215221758U
Application number: CN202120059863.1U
Authority: CN
Inventors: 钟炳; 修舟; 闫海珠
Original assignee: Hebi Tianhai Electronic Information System Co Ltd
Current assignee: Hebi Tianhai Electronic Information System Co Ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-12-17
Anticipated expiration: 2031-01-11

Abstract

The utility model provides a double cell redundant circuit relates to the double cell power supply field, and the circuit mainly includes switch circuit, fast switch over circuit and master control circuit, and the normal operating of the whole circuit of master control circuit control, switch circuit are used for controlling the power supply break-make of battery, and fast switch over circuit is used for guaranteeing that the circuit does not cut off the power supply when hard plug battery. The master control circuit can control the switch circuit alone, lets the battery power supply, and because there is the fast switch over circuit among the utility model, the battery also can plug and the circuit does not cut off the power supply hard moreover. The switch tube can control the on-off of the power supplied to the circuit by the high-voltage and low-voltage batteries. The fast switching circuit is mainly characterized in that the voltage drop action of the diodes is utilized, and the voltage drops of the diodes are connected in series and overlapped, so that the potential of the grid of the switching tube is compared with the potential of the anode of another battery, and the effect of uninterrupted power supply of the whole circuit is achieved.

Description

Double-battery redundant circuit

Technical Field

The utility model relates to a double cell power supply field especially relates to a double cell redundant circuit.

Background

Batteries are important parts of electronic equipment, and due to the technical reason of batteries, the capacity of the batteries is limited, and the batteries need to be disassembled for charging after being used for a period of time. In some special application scenarios, the device is required to be not powered off, so that the device in a dual-battery power supply mode is available, but the device is inconvenient to use and has certain limitations, for example, when the battery voltage is high, the battery can supply power to the outside, and when the battery voltage is low, the battery cannot supply power to the outside; some batteries must be switched by informing the main controller to switch power supply, for example, the battery cannot be directly plugged or unplugged by pressing a key of K1/K2, which is troublesome for users.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, a dual-battery redundancy circuit is provided, which is characterized by comprising a fast switching circuit, a main control MCU circuit, a battery circuit and an output circuit BAT;

the fast switching circuit comprises a diode 1 circuit and a diode 2 circuit, the switch circuit comprises a switch SW1 circuit and a switch SW2 circuit, the battery circuit comprises an input end battery BAT1 and an input end battery BAT2, the main control MCU circuit is respectively connected with the input end battery BAT1, the input end battery BAT2, the switch SW1 circuit and the switch SW2 circuit, the input end battery BAT1 is respectively connected with the switch SW1 circuit and the diode 2 circuit, the input end battery BAT2 is respectively connected with the switch SW2 circuit and the diode 1 circuit, the switch SW1 circuit is respectively connected with the diode 1 circuit and the switch output circuit BAT, the switch SW2 circuit is respectively connected with the diode 2 circuit and the output circuit BAT, and the switch SW1 circuit is connected with the switch SW2 circuit.

Preferably, the fast switching circuit is a dual-battery redundancy circuit, wherein the voltage of the battery BAT1 at the input end is compared with the voltage of the battery BAT2 at the input end, so that the output circuit BAT is not powered off when any battery is plugged in or unplugged from the dual-battery redundancy circuit, the diode 1 circuit in the fast switching circuit comprises diodes D11, D12, D13, D14,....... No. D1n-1 and D1n, wherein n represents the number of the diodes, the positive electrode of D11 is connected with the end 4 of the switch tube Q1 in the switching circuit, the negative electrode of D11 is connected with the positive electrode of D12, the negative electrode of D12 is connected with the positive electrode of D13, the negative electrode of D13 is connected with the positive electrode of D14, the negative electrode of D1n-1 is connected with the positive electrode of D1n, and the negative electrode of D1n is connected with the positive electrode of the battery BAT 2;

the diode 2 circuit in the fast switching circuit comprises diodes D21, D22, D23, D24, D2n-1 and D2n, wherein the anode of D21 is connected with the gate 4 end of a switch tube Q3 in the switch circuit, the cathode of D21 is connected with the anode of D22, the cathode of D22 is connected with the anode of D23, the cathode of D23 is connected with the anode of D24, the cathode of D24 is connected with the anode of D2n-1, and the cathode of Dn is connected with the anode of a battery BAT 1.

Preferably, the number of diodes in the diode 1 circuit and the diode 2 circuit in the fast switching circuit is related to the ratio of the upper limit voltage minus the lower limit voltage of the input battery BAT1/BAT2 and the voltage drop of the diodes, and when the ratio has decimal place, the number of diodes is an integer which is the integral number of the ratio plus one when the ratio has decimal place.

Preferably, the switch circuit can control the on-off of the high-low voltage battery power supply circuit between 3.7V and 72V, the switch SW1 circuit includes a switch tube Q1, a resistor R4, a resistor R3, a switch tube Q2, a resistor R2, a resistor R1 and a capacitor C1, the resistor R4 is connected in parallel with the capacitor C1, one end of the resistor R4 is connected with the

source

1, 2 and 3 ends of the switch tube Q1, the

source

1, 2 and 3 ends of the switch tube Q1 are connected with the anode of the battery BAT1, the other end of the resistor R4 is connected with the gate 4 end of the switch tube Q1, the anode of the diode D11 and one end of the resistor R3, the

drain

5, 6, 7, 8 ends of the switch tube Q1 are connected with the output circuit, the other end of the resistor R3 is connected with the collector 3 end of the switch tube Q2, one end of the resistor R2 is connected with the master control circuit, and the other end of the resistor R2 is connected with the collector 3 end of the resistor R1, The bases of the switching tube Q2 are connected with each other, and the other end of the resistor R1 is connected with the emitter of the switching tube Q2 in parallel and is grounded;

the switch SW2 circuit comprises a switch tube Q3, a resistor R8, a resistor R7, a switch tube Q4, a resistor R6, a resistor R5 and a capacitor C8, the resistor R8 is connected in parallel with the capacitor C8, one end of the resistor R8 is connected with the

source

1, 2 and 3 ends of the switch tube Q3, the

source

1, 2 and 3 ends of the switch tube Q3 are connected with the anode of the input end battery BAT1, the other end of the resistor R8 is connected with the gate 4 end of the switch tube Q3, the anode of the diode D7 and one end of the resistor R7 respectively, the

drain

5, 6, 7 and 8 ends of the switch tube Q3 are connected with the output circuit, the other end of the resistor R7 is connected with the collector 3 end of the switch tube Q4, one end of the resistor R6 is connected with the main control circuit, the other end of the resistor R6 is connected with one end of the resistor R5 and the base of the switch tube Q4 respectively, and the other end of the resistor R5 is connected with the emitter of the switch tube Q4 in parallel and grounded.

Preferably, the master control MCU circuit is used for controlling the normal operation of the whole circuit, the master control MCU circuit comprises an STC15W408AS single chip microcomputer, a P1.1 pin of the single chip microcomputer is connected with an input end battery BAT2, a P1.0 pin of the single chip microcomputer is connected with an input end battery BAT1, a P3.3 pin of the single chip microcomputer is connected with a switch SW2 circuit, a P3.2 pin of the single chip microcomputer is connected with a switch SW1 circuit, when the voltage of the batteries is different, the program parameters of the master control MCU module can be adjusted, and therefore the effect that the high-voltage battery and the low-voltage battery can supply power is achieved.

Preferably, the output circuit BAT is a load circuit, the output circuit BAT is respectively connected with the switch SW1 circuit and the switch SW2 circuit, and the load circuit is an output battery or an output motor.

Through the technical scheme, the beneficial effects of the utility model are that:

1. the switching circuit and the master control MCU realize that the high-voltage battery and the low-voltage battery can be externally supplied with power;

2. the diode circuit realizes hard switching of the plugged battery without power failure, avoids manual switching operation and realizes arbitrary switching without power failure in a real sense;

3. by adding the diode mode, the circuit is simple and the cost is low.

Drawings

FIG. 1 is a general block diagram of the present invention;

FIG. 2 is a circuit diagram of a first portion of a master control of the present invention;

FIG. 3 is a circuit diagram of a second portion of the master control of the present invention;

FIG. 4 is a third circuit diagram of the main control unit of the present invention;

FIG. 5 is a circuit diagram of the switch portion and the fast switching portion of the present invention as a whole;

fig. 6 is a circuit diagram of the switch part and the quick switching part in the single cell according to the present invention.

Detailed Description

The foregoing and other technical matters, features and functions of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. The circuit contents mentioned in the following embodiments are all referred to the drawings of the specification.

In a first embodiment, a dual-battery redundancy circuit is shown with reference to fig. 1, and is characterized by comprising a fast switching circuit, a main control MCU circuit, a battery circuit and an output circuit BAT;

the dual-battery redundancy circuit further comprises a display circuit, a voltage stabilizing circuit and an ADC (analog to digital converter) sampling circuit, the main control MCU circuit reads and processes the acquired voltage of the ADC sampling circuit, the acquired voltage is displayed through the display circuit, the switching circuit is controlled to switch on and off the power supply of the battery circuit, when the dual batteries are powered off, the negative electrode of the rapid switching circuit is instantly grounded through the ADC sampling resistor, the grid 4 end of the switching tube Q1/Q3 generates a conducting voltage, and Q1/Q3 is conducted, so that the batteries are switched without power failure;

according to the attached figure 6, when only the battery BAT1 is inserted and the battery BAT2 is not inserted, because the ADC sampling circuit is connected in parallel with the positive electrode of the BAT2 battery seat, the BAT2 battery seat is equivalently pulled down to GND, an arrow loop is divided by a diode and a resistor, the diode is in a conducting state, so that the switching tube Q1 is turned on, the battery BAT1 starts to supply power to the output circuit BAT, and when only the BAT2 battery supplies power, the working principle is the same as that when the battery BAT1 works alone; when the two batteries are in the circuit, the arrowhead loop is in an off state due to the conduction voltage of the diode, the switch tube Q1/Q3 is cut off, and the switch tube is controlled to be conducted by the main control MCU circuit to supply power to the circuit. In order to ensure that the fast switching circuit is in a cut-off state when the double batteries are powered, for example, the conducting voltage of a single diode is set to be 0.7V, the lowest voltage of the battery is set to be 6V, and the highest voltage is set to be 8.4V, then the number of the serially connected diodes is (8.4-6)/0.7=3.4, 4 diodes are required to be serially connected in order to ensure that the circuit works normally and avoid over-discharge of the battery, when the batteries with other voltages are replaced, the number of the diodes used by the fast switching circuit is calculated according to the above formula, when the battery voltage reaches the lowest discharge voltage, the main control MCU circuit turns on the switch tube Q2/Q4 and turns off the switch tube Q1/Q3, the display circuit displays that the battery voltage is low, a user can take off the battery, and when the two batteries are in the circuit, the battery with low battery voltage preferentially supplies power to the output circuit BAT.

The display circuit is used for displaying the residual capacity of the battery, the display circuit comprises four LED lamps and four current-limiting resistors, each LED lamp is connected with one current-limiting resistor in series, the display circuit can also use a display screen, but the display circuit needs to see application occasions, such as the application to an unmanned aerial vehicle, the weight needs to be considered, the LED is selected for use to display the state of the battery, and the display circuit needs to analyze specifically and apply flexibly in specific occasions.

The voltage stabilizing circuit comprises diodes D3 and D4, a resistor R18, capacitors C24, C25, 26, C27 and C28, and a voltage stabilizing chip U3 which is mainly used for stabilizing the working voltage of the circuit and ensuring the normal operation of the circuit, wherein an LM11173V3 chip is adopted in the circuit to provide 3.3V voltage for the main control MCU circuit, and capacitors are connected in parallel at the input end and the output end of the voltage stabilizing chip and used for filtering signal interference.

The sampling upper limit voltage of an ADC sampling circuit in the single chip microcomputer is 5V, so that the sampled battery voltage is obtained after resistance voltage division, when the battery voltage changes, the circuit can normally work under new voltage only by adjusting the resistance ratio of a voltage division resistor and setting and changing parameters in program parameters of a main control MCU circuit.

The battery circuit comprises an input battery BAT1 and an input battery BAT2, the voltage of the battery is between 3.7V and 72V, and the high-low voltage battery is obtained through comparison between the batteries, such as an 8.4V battery used for the previous work of the circuit, a 12V battery used for the next work of the circuit, the 8.4V battery is a low-voltage battery relative to the 12V battery, the 12V battery is a high-voltage battery relative to the 8.4V battery, and the high and the low are relative concepts.

In a second embodiment, referring to fig. 5, a diode 1 circuit in the fast switching circuit includes diodes D11, D12, D13 and D14, wherein the anode of D11 is connected to the gate 4 of the switching tube Q1 in the switching circuit, the cathode of D11 is connected to the anode of D12, the cathode of D12 is connected to the anode of D13, the cathode of D13 is connected to the anode of D14, and the cathode of D14 is connected to the anode of the battery BAT 2;

the diode circuit 2 comprises diodes D7, D8, D9 and D10, wherein the anode of the D7 is connected with the end 4 of the grid of a switch tube Q3 in the switch circuit, the cathode of the D7 is connected with the anode of the D8, the cathode of the D8 is connected with the anode of the D9, the cathode of the D9 is connected with the anode of the D10, and the cathode of the D10 is connected with the anode of a battery BAT 1.

Third embodiment, on the basis of the first embodiment, referring to fig. 5, in the fast switching circuit, the number of diodes in the diode 1 circuit and the diode 2 circuit is related to the ratio of the upper limit voltage minus the lower limit voltage of the input battery BAT1/BAT2 and the voltage drop of the diodes, and when the ratio has a decimal number, the number of diodes is an integer obtained by adding one to the integer of the ratio.

In a fourth embodiment, based on the first embodiment, referring to fig. 2, 3, 4 and 5, the switching circuit can control the on/off of the high-low voltage battery power supply circuit between 3.7V and 72V, the switch SW1 circuit includes a switch tube Q1, a resistor R4, a resistor R3, a switch tube Q2, a resistor R2, a resistor R1 and a capacitor C1, the resistor R4 is connected in parallel with the capacitor C1, one end of the resistor R4 is connected to the

source

1, 2 and 3 of the switch tube Q1, the

source

1, 2 and 3 of the switch tube Q1 and the positive electrode of the input battery BAT1 are connected to each other, the other end of the resistor R4 is connected to the gate terminal of the switch tube Q42, the positive electrode of the diode D11, one end of the resistor R3, the

drain

5, 6, 7, 8 and the output circuit of the switch tube Q1 are connected to each other, the other end of the resistor R375 and the main control circuit of the switch tube Q2 are connected to each other end of the main control circuit, the other end of the resistor R2 is respectively connected with one end of a resistor R1 and the base electrode of the switching tube Q2, and the other end of the resistor R1 is connected with the emitter electrode of the switching tube Q2 in parallel and is grounded;

source

1, 2 and 3 ends of the switch tube Q3, the

source

drain

Fifth embodiment, on the basis of the first embodiment, referring to fig. 2, fig. 3 and fig. 4, the main control MCU circuit is used to control the normal operation of the whole circuit, the main control MCU circuit includes an STC15W408AS single chip microcomputer, a P1.1 pin of the single chip microcomputer is connected to an input terminal battery BAT2, a P1.0 pin of the single chip microcomputer is connected to an input terminal battery BAT1, a P3.3 pin of the single chip microcomputer is connected to a switch SW2 circuit, and a P3.2 pin of the single chip microcomputer is connected to a switch SW1 circuit, and when the voltages of the batteries are different, program parameters of the main control MCU module can be adjusted to achieve the effect that both the high-voltage battery and the low-voltage battery can supply power. The single chip microcomputer of the type has high internal crystal oscillator precision and only has an internal crystal oscillator, and has no crystal oscillator pin outside, so that the single chip microcomputer of the type can be used for realizing circuit building and circuit functions by other single chip microcomputers.

Sixth embodiment, on the basis of the first embodiment, referring to fig. 1, 2, 3, and 4, the output circuit BAT is a load circuit, the output circuit BAT is respectively connected with the switch SW1 circuit and the switch SW2 circuit, and the load circuit is an output battery or an output motor. The type of load is not limited, depending on the particular application.

Taking the low-voltage battery output as an example, the voltage state of BAT1/BAT2/BAT is monitored by using an oscilloscope, 300mA current is fixedly pumped at the BAT end by using an electronic load, and the working condition of the circuit in the actual load state is simulated. The test results are as follows, the output voltage is lower than the input voltage due to the MOS transistor on-resistance and the wire loss. The voltage of the output end of the circuit BAT is lower than the voltage of the battery due to the voltage drop of the switching tube when the single cell supplies power; when the double batteries are in the circuit at the same time, the battery with low battery voltage is preferentially used for supplying power; when the input end battery BAT2 which is supplying power is unplugged, the input end battery BAT1 is quickly switched on due to the existence of the quick switching circuit, and the battery plugging output circuit BAT is not powered off.

In the depictions of the present specification, reference to the description of the terms "embodiment one," "embodiment two," "embodiment three," "embodiment four," "embodiment five," "embodiment six," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. The schematic representations of the terms used in this specification are not necessarily the same embodiment or example. And the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-battery redundancy circuit is characterized by comprising a fast switching circuit, a main control MCU circuit, a battery circuit and an output circuit BAT;

2. The dual-battery redundancy circuit of claim 1, wherein the fast switching circuit is a dual-battery redundancy circuit that compares the voltage of the battery BAT1 at the input end with the voltage of the battery BAT2 at the input end, and functions as a dual-battery redundancy circuit that the output circuit BAT is not powered off when any battery is plugged in or unplugged from the dual-battery redundancy circuit, the diode 1 circuit in the fast switching circuit includes diodes D11, D12, D13, D14, a.... D1n-1, D1n, the positive electrode of D11 and the gate 4 end of the switching tube Q1 in the switching circuit are connected with each other, the negative electrode of D11 and the positive electrode of D12 are connected with each other, the negative electrode of D12 and the positive electrode of D13 are connected with each other, the negative electrode of D13 and the positive electrode of D14 are connected with each other,... D1n-1 and the negative electrode of D1n and the positive electrode of D n and the battery BAT 73729 are connected with each other;

3. The dual battery redundancy circuit of claim 1, wherein the fast switching circuit comprises a diode 1 circuit and a diode 2 circuit, the number of diodes in the diode 1 circuit and the diode 2 circuit is related to the ratio of the upper limit voltage minus the lower limit voltage of the battery at the input terminal BAT1/BAT2 and the voltage drop of the diodes, and when the ratio has a decimal number, the number of diodes is an integer which is the integer number of the integer number plus one.

4. The dual battery redundancy circuit of claim 1, wherein the switch circuit is capable of controlling the on/off of the high/low voltage battery power supply circuit between 3.7V and 72V, the switch SW1 circuit comprises a switch Q1, a resistor R4, a resistor R3, a switch Q2, a resistor R2, a resistor R1 and a capacitor C1, the resistor R4 is connected in parallel with the capacitor C1, one end of the resistor R4 is connected with the sources 1, 2 and 3 of the switch Q1, the sources 1, 2 and 3 of the switch Q1 are connected with the positive electrode of the input battery BAT1, the other end of the resistor R4 is connected with the gate 4 of the switch Q1, the positive electrode of the diode D11, one end of the resistor R3, the drains 5, 6, 7, 8 of the switch Q1 are connected with each other, the other end of the resistor R3 is connected with the collector 3 of the switch Q2, and the main control circuit is connected with the collector 2 of the switch Q3, the other end of the resistor R2 is respectively connected with one end of a resistor R1 and the base electrode of the switching tube Q2, and the other end of the resistor R1 is connected with the emitter electrode of the switching tube Q2 in parallel and is grounded;

the switch SW2 circuit comprises a switch tube Q3, a resistor R8, a resistor R7, a switch tube Q4, a resistor R6, a resistor R5 and a capacitor C8, the resistor R8 is connected in parallel with the capacitor C8, one end of the resistor R8 is connected with the source 1, 2 and 3 ends of the switch tube Q3, the source 1, 2 and 3 ends of the switch tube Q3 are connected with the anode of the input end battery BAT1, the other end of the resistor R8 is connected with the gate 4 end of the switch tube Q3, the anode of the diode D7 and one end of the resistor R7 respectively, the drain 5, 6, 7 and 8 ends of the switch tube Q3 are connected with the output circuit, the other end of the resistor R7 is connected with the collector 3 end of the switch tube Q4, one end of the resistor R6 is connected with the main control circuit, the other end of the resistor R6 is connected with one end of the resistor R5 and the base of the switch tube Q4 respectively, and the other end of the resistor R5 is connected with the emitter of the switch tube Q4 in parallel and grounded.

5. The dual-battery redundancy circuit of claim 1, wherein the master MCU circuit is configured to control normal operation of the entire circuit, and the master MCU circuit comprises a STC15W408AS single chip microcomputer, wherein a P1.1 pin of the single chip microcomputer is connected to a battery BAT2 at an input end, a P1.0 pin of the single chip microcomputer is connected to a battery BAT1 at an input end, a P3.3 pin of the single chip microcomputer is connected to a switch SW2 circuit, and a P3.2 pin of the single chip microcomputer is connected to a switch SW1 circuit.

6. The dual battery redundancy circuit of claim 1, wherein the output circuit BAT is a load circuit, the output circuit BAT is connected to the switch SW1 circuit and the switch SW2 circuit, respectively, and the load circuit is an output battery or an output motor.