CN220273361U - Battery power supply device using different voltages - Google Patents

Abstract

The utility model discloses a battery power supply device using different voltages, and belongs to the technical field of power electronics. The utility model relates to a battery power supply device using different voltages, which comprises a lithium battery module, a multi-input direct current converter, a sampling control circuit and a boost circuit, wherein the lithium battery module is connected with the multi-input direct current converter; the lithium battery module outputs a voltage value signal to the sampling control circuit and supplies power to the sampling control circuit, and the sampling control circuit controls whether a battery in the lithium battery module is conducted or not according to the voltage value signal; the lithium battery module also outputs voltage to the multi-input direct current converter, the sampling control circuit outputs a control signal to the multi-input direct current converter to control the on-off of the multi-input direct current converter, the multi-input direct current converter outputs the voltage to the boost circuit, and the boost circuit boosts the voltage and outputs the boosted voltage. The utility model is mainly used for realizing alternate power supply of batteries with different voltages by adopting a power supply complementation mode.

Description

Battery power supply device using different voltages

Technical Field

The utility model relates to the technical field of power electronics, in particular to a battery power supply device using different voltages.

Background

Based on environmental requirements and policy support for industry, new energy industries bloom throughout, and batteries are used as one of new energy in various fields. Since batteries are widely used, different batteries are sometimes used in different fields, and thus, there are also various kinds of batteries. At present, the lithium battery is widely applied due to the advantages of high specific power, long cycle life, good safety performance, no pollution and the like. The lithium battery is mainly divided into a lithium iron phosphate battery, a ternary lithium battery, a lithium cobalt oxide battery and the like in category, and different types of lithium batteries have different advantages and disadvantages, so that advantages of the lithium batteries are complementary by combination, better performance and stability are obtained, but internal resistance and discharge voltage characteristic curves of the different types of batteries are different, and direct parallel connection or serial connection are obviously not feasible.

Through searching, chinese patent CN109742820A discloses a battery device with different capacities and overlapped new and old batteries, a plurality of lithium batteries with different new and old batteries are added simultaneously, an undervoltage threshold is set, when the voltage of two batteries is higher than the undervoltage threshold, the batteries with the highest voltages are used for supplying power firstly after collection operation through processing in a processing module. In the scheme, although different batteries are connected in a power supply circuit, one battery is equivalent to the standby of the other battery, and certain defects still exist in the utilization of battery energy.

Disclosure of Invention

1. Technical problem to be solved by the utility model

Aiming at least some problems in the prior art, the utility model provides a battery power supply device using different voltages, which adopts a power supply complementation mode to realize that batteries with different voltages alternately supply power outwards.

2. Technical proposal

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the battery power supply device using different voltages comprises a lithium battery module, a multi-input direct current converter, a sampling control circuit and a boost circuit, wherein the lithium battery module is connected with the multi-input direct current converter and the sampling control circuit, the multi-input direct current converter is connected with the sampling control circuit and the boost circuit, the lithium battery module comprises a first battery B1 and a second battery B2, the first battery B1 is connected with a first electronic switch Q9, and the second battery B2 is connected with a second electronic switch Q10; the multi-input direct current converter comprises a first branch and a second branch, wherein the first branch comprises a third electronic switch Q6, the input end of the third electronic switch Q6 is connected with a first electronic switch Q9, and the output end of the third electronic switch Q6 is connected with a boost circuit; the second branch circuit comprises a fourth electronic switch Q8, the input end of the fourth electronic switch Q8 is connected with a second electronic switch Q10, and the output end of the fourth electronic switch Q8 is connected with a boost circuit; and the control ends of the third electronic switch Q6 and the fourth electronic switch Q8 are connected with a sampling control circuit, and when the voltages of the first battery B1 and the second battery B2 are larger than the respective undervoltage values, the sampling control circuit controls the third electronic switch Q6 and the fourth electronic switch Q8 to be alternately switched on and switched off.

Further, the cathodes of the first battery B1 and the second battery B2 are connected; the positive electrode of the first battery B1 is connected with a first electronic switch Q9, and the output end of the first electronic switch Q9 is connected with a node VBAT1; the positive electrode of the second battery B2 is connected with a second electronic switch Q10, and the output end of the second electronic switch Q10 is connected with a node VBAT2.

Further, the input end of the third electronic switch Q6 is connected to the node VBAT1, and the output end is connected to the node in+; the input end of the fourth electronic switch Q8 is connected with the node VBAT2, and the output end is connected with the node IN+.

Further, the voltage output by the multi-input direct current converter is input to a boost circuit through the node IN+; the boost circuit comprises an inductor L3 and a fourth control module U4, the node IN+ is connected with the inductor L3, the other end of the inductor L3 is connected with the fourth control module U4, and the voltage input by the node IN+ is boosted through the combined action of the inductor L3 and the fourth control module U4 and then output through an output end VOUT.

Further, the first electronic switch Q9, the second electronic switch Q10, the third electronic switch Q6 and the fourth electronic switch Q8 are all MOS electronic switching tubes.

Further, the sampling control circuit comprises a first control module U1, and a port PA0 of the first control module U1 is connected with a G pole of the first electronic switch Q9 and is used for controlling on-off of the first electronic switch Q9; the port PA1 of the first control module U1 is connected to the G pole of the second electronic switch Q10, and is used for controlling the on-off of the second electronic switch Q10.

Further, the G pole of the third electronic switch Q6 is connected to the port PB0 of the first control module U1 through the node PWM0, so that the first control module U1 can control the on/off of the third electronic switch Q6; the G pole of the fourth electronic switch Q8 is connected to the port PB1 of the first control module U1 through the node PWM1, so that the first control module U1 can control the on/off of the fourth electronic switch Q8.

Further, the positive electrode of the first battery B1 is connected to the node VM1, and the node VM1 is connected to the port PA4 of the first control module U1, so that the first control module U1 collects the output voltage of the first battery B1; the positive electrode of the second battery B2 is connected with the node VM2, and the node VM2 is connected with the port PA5 of the first control module U1 and is used for collecting the output voltage of the first battery B2 by the first control module U1.

Further, the node VM1 is further connected to a second control module U2, and the second control module U2 is further connected to the first control module U1, so that the first battery B1 can supply power to the first control module U1; the node VM2 is further connected with a third control module U3, and the third control module U3 is further connected with the first control module U1, so that the second battery B2 can supply power for the first control module U1.

Compared with the prior art, the technical scheme provided by the utility model has the following remarkable effects:

(1) The utility model provides a battery power supply device using different voltages, which can automatically switch batteries or alternatively use the batteries according to the output voltages and the undervoltage values of different batteries, thereby improving the utilization rate and the service life of the batteries.

(2) The utility model provides a battery power supply device using different voltages, which can control a multi-input direct current converter and a boost circuit by outputting PWM signals through a sampling control circuit and output stable 12V voltage. The sampling control circuit can adjust parameters of PWM signals in real time, so that output currents of different batteries are kept the same, and balanced use of the different batteries is achieved. The fourth control module can automatically adjust the mode and the frequency of the boosting chip according to the change of input and output, optimize the filtering effect of the output end through a plurality of capacitors connected in parallel, and improve the stability and the efficiency of output voltage.

(3) The utility model provides a battery power supply device using different voltages, which can automatically adjust the duty ratio and the frequency of PWM signals according to the output voltage and the undervoltage value of different batteries through the design of a multi-input direct current converter, thereby realizing the parallel connection of the batteries with different voltages, greatly improving the peak power of a battery system and meeting the requirement of high-power load.

Drawings

FIG. 1 is a schematic diagram of the principles of the present utility model;

FIG. 2 is a schematic diagram of a lithium battery module circuit;

FIG. 3 is a circuit diagram of a first battery multiple-input DC converter;

FIG. 4 is a circuit diagram of a second battery multiple-input DC converter;

FIG. 5 is a first battery voltage sampling circuit diagram;

FIG. 6 is a second battery voltage sampling circuit diagram;

FIG. 7 is a schematic diagram of a single chip microcomputer in a sampling control circuit;

FIG. 8 is a diagram of a single chip microcomputer power supply circuit in the sampling control circuit of the first battery;

FIG. 9 is a diagram of a single chip microcomputer power supply circuit in the sampling control circuit for the second battery;

fig. 10 is a circuit diagram of the boost circuit.

Reference numerals in the schematic drawings illustrate:

1. a lithium battery module; 2. a multiple-input DC converter; 3. a sampling control circuit; 4. boost circuit.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

Example 1

As shown in fig. 1, the present embodiment provides a battery power supply device using different voltages, including a lithium battery module 1, a multi-input dc converter 2, a sampling control circuit 3, and a boost circuit 4. Wherein the lithium battery module 1 comprises two lithium batteries with different voltages, and can provide power outwards. The multi-input dc converter 2 can alternately turn on different lithium batteries in the lithium battery module 1 in a period of microsecond level. And the sampling control circuit 3 is used for collecting the voltages of different lithium batteries in the lithium battery module 1 and controlling the multi-input direct current converter 2 by output signals. The boost circuit 4 boosts the voltage output from the multi-input dc converter 2.

The lithium battery module 1 is connected to a multi-input dc converter 2 and a sampling control circuit 3, and the multi-input dc converter 2 is connected to the sampling control circuit 3 and a boost circuit 4. Specifically, the lithium battery module 1 outputs a voltage value signal to the sampling control circuit 3 and simultaneously supplies power to the sampling control circuit 3; the sampling control circuit 3 controls whether the battery in the lithium battery module 1 is conducted or not according to the voltage value signal; the lithium battery module 1 also outputs a voltage to the multi-input direct current converter 2; the sampling control circuit 3 outputs control signals to the multi-input direct current converter 2 according to the collected voltage value signals of the lithium battery module 1, and controls the on-off of the multi-input direct current converter 2, the multi-input direct current converter 2 outputs voltage to the boost circuit 4, and the boost circuit 4 boosts the voltage and outputs the boosted voltage.

Further, as shown in fig. 2, the lithium battery module 1 includes a first battery B1 and a second battery B2, and the first battery B1 and the second battery B2 are two different types of batteries. The first battery B1 and the second battery B2 are connected with negative electrodes. The positive electrode of the first battery B1 is connected with a first electronic switch Q9, and the output end of the first electronic switch Q9 is connected with a node VBAT1. The positive electrode of the second battery B2 is connected with a second electronic switch Q10, and the output end of the second electronic switch Q10 is connected with a node VBAT2. When the first electronic switch Q9 and the second electronic switch Q10 are turned on or off, the first battery B1 and the second battery B2 are turned on or off. And the first electronic switch Q9 or the second electronic switch Q10 can be turned off when the voltage of the first battery B1 or the second battery B2 is insufficient, preventing the batteries from being excessively discharged.

As shown in fig. 3 and 4, the multiple-input dc converter 2 includes a first branch and a second branch. The first branch circuit comprises a third electronic switch Q6, the input end of the third electronic switch Q6 is connected with a node VBAT1, and the output end of the third electronic switch Q6 is connected with a node IN+. The second branch circuit comprises a fourth electronic switch Q8, the input end of the fourth electronic switch Q8 is connected with a node VBAT2, and the output end of the fourth electronic switch Q8 is connected with a node IN+.

As shown IN fig. 10, a node in+ is connected to the boost circuit 4, and the voltage output from the multi-input dc converter 2 is input to the boost circuit 4 through the node in+. Specifically, the boost circuit 4 includes an inductor L3 and a fourth control module U4, where the node in+ is connected with the inductor L3, the other end of the inductor L3 is connected with the fourth control module U4, and the voltage input by the node in+ is boosted by the combined action of the inductor L3 and the fourth control module U4 and then output through the output terminal VOUT.

For more detail and convenience in explanation and understanding of the circuit design in the device, the first electronic switch Q9, the second electronic switch Q10, the third electronic switch Q6 and the fourth electronic switch Q8 are all MOS electronic switch tubes.

As shown in fig. 5 to 9, the sampling control circuit 3 includes a first control module U1, and a port PA0 of the first control module U1 is connected to a G pole of the first electronic switch Q9, for controlling on/off of the first electronic switch Q9. The port PA1 of the first control module U1 is connected to the G pole of the second electronic switch Q10, and is used for controlling the on-off of the second electronic switch Q10. The G pole of the third electronic switch Q6 is connected with a port PB0 of the first control module U1 through a node PWM0, so that the first control module U1 can control the on-off of the third electronic switch Q6; the G pole of the fourth electronic switch Q8 is connected to the port PB1 of the first control module U1 through the node PWM1, so that the first control module U1 can control the on/off of the fourth electronic switch Q8. Referring to fig. 2, the positive electrode of the first battery B1 is further connected to a node VM1, where the node VM1 is connected to the port PA4 of the first control module U1, and is used for the first control module U1 to collect the output voltage of the first battery B1. The positive electrode of the second battery B2 is also connected with a node VM2, and the node VM2 is connected with a port PA5 of the first control module U1 and is used for collecting the output voltage of the first battery B2 by the first control module U1.

In this embodiment, the sampling control circuit 3 collects voltages output by the first battery B1 and the second battery B2 through the port PA4 and the port PA5, and controls the on-off of the first electronic switch Q9, the second electronic switch Q10, the third electronic switch Q6 and the fourth electronic switch Q8 according to the collected voltage values.

The first battery B1 and the second battery B2 further supply power to the sampling control circuit 3, and the sampling control circuit 3 further includes a second control module U2 and a third control module U3. Specifically, the node VM1 is further connected to a second control module U2, and the second control module U2 is further connected to the first control module U1, so that the first battery B1 can supply power to the first control module U1. The node VM2 is further connected with a third control module U3, and the third control module U3 is further connected with the first control module U1, so that the second battery B2 can supply power for the first control module U1.

Further, in this embodiment, as shown in fig. 2, a resistor R11 is further connected between the positive electrode of the first battery B1 and the port PA0, and a resistor R12 is further connected between the positive electrode of the second battery B2 and the port PA1, wherein the resistor R11 and the resistor R12 are pull-up resistors, which serve as voltage bias.

As shown IN fig. 3, the D pole of the third electronic switch Q6 IN the first branch is connected to the node VBAT1, the S pole is connected to the input terminal of the diode Q5, the output terminal of the diode Q5 is connected to the node in+, and the diode Q5 makes current conduct unidirectionally. The D pole of the third electronic switch Q6 is further connected to a capacitor C11 and a capacitor C12, where the capacitor C11 and the capacitor C12 are connected in parallel, and the other end of the capacitor C is commonly grounded, and the capacitor C11 and the capacitor C12 are used for filtering of the first branch circuit, so as to reduce voltage ripple. The first branch circuit further comprises a triode Q1 and a triode Q2, wherein the 1 st pin and the 3 rd pin of the triode Q2 are connected with a resistor R14, the 2 nd pin of the triode Q2 is connected with the input end of a diode D3 and the G pole of a third electronic switch Q6, the 1 st pin of the triode Q1 is connected with a resistor R13 and then is connected with a node PWM0, and the 3 rd pin of the triode Q1 is connected with the output end of the diode D3, the 1 st pin of the triode Q2 and the resistor R14 to form a driving circuit of the third electronic switch Q6. When the diode D3 turns on the transistor Q1, a G-pole discharge path of the third electronic switch Q6 is formed.

As shown IN fig. 4, the D pole of the fourth electronic switch Q8 IN the second branch is connected to the node VBAT2, the S pole is connected to the input terminal of the diode Q7, the output terminal of the diode Q7 is connected to the node in+, and the diode Q7 makes the current conduct unidirectionally. The D pole of the fourth electronic switch Q8 is further connected to a capacitor C13 and a capacitor C14, where the capacitor C13 and the capacitor C14 are connected in parallel, and the other end of the capacitor C is commonly grounded, and the capacitor C13 and the capacitor C14 are used for filtering of the second branch circuit, so as to reduce voltage ripple. And the second branch circuit also comprises a triode Q3 and a triode Q4, the 1 st pin of the triode Q3 is connected with the resistor R15 and then connected with the node PWM1, and the other connections are consistent with those in the first branch circuit.

As shown in fig. 5 and 6, the circuit in which the first control module U1 in the sampling control circuit 3 samples through the port PA4 is specifically that a resistor R1 and a resistor R2 are further connected in series between the node VM1 and the port PA4, the resistor R2 is further connected to the resistor R3 and then grounded, and a capacitor C1 is further connected between the port PA4 and the grounded terminal. The first control module U1 in the sampling control circuit 3 coincides with the circuit sampled by the port PA5 and the circuit sampled by the port PA 4.

As shown in fig. 8 and 9, the second control module U2 and the third control module U3 are both buck-boost controllers, and MP28164GD-Z chips are selected. The node VM1 is connected with the port EN of the second control module U2, and the port VOUT output of the second control module U2 is connected with the 3.3V port of the first control module U1. An inductor L1 is also connected between the port SW1 and the port SW2 of the second control module U2. The port EN is also connected with a capacitor C3, the port VCC is connected with a capacitor C4, the port VOUT is also connected with a capacitor C5 and a capacitor C6, and the capacitor C5 and the capacitor C6 are connected in parallel. Resistor R8 is also connected between port VOUT and port FB, and port FB and resistor R8 are also connected with resistor R7.

In the third control module U3, the node VM2 is connected to the port EN of the third control module U3, and the port VOUT output of the third control module U3 is connected to the VBAT port of the first control module U1. The other connection modes are consistent with those in the second control module U2.

As shown in fig. 10, the fourth control module U4 in the boost circuit 4 is a boost chip, and an MP3431 chip is optional. One end of the inductor L3 is connected to the node in+ and the other end is connected to the port SW of the fourth control module U4. The boost circuit 4 further includes a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a resistor R17, a resistor R18, a resistor R19, a resistor R20, and a resistor R21. Specifically, two ends of the inductor L3 are respectively connected with the port SW and the port VIN of the fourth control module U4, the capacitors C15, C16 and C17 are connected in parallel and then connected with the port VIN, the port EN and the port MODE of the fourth control module U4, the capacitor C18 is connected with the port VIN, the port EN and the port MODE of the fourth control module U4, the capacitor C19 is connected with the port VDD of the fourth control module U4, the capacitor C20 is connected with the port SS of the fourth control module U4, the capacitor C22 is connected with the port COMP of the fourth control module U4, the capacitors C23, C24 and C25 are connected in parallel and then connected with the port VOUT of the fourth control module U4, the resistor R17 is connected with the port ILIM of the fourth control module U4, the resistor R20 is connected with the port VOUT and the port FB of the fourth control module U4, and the resistor R19 is connected with the port FB of the fourth control module U4. In the present embodiment, the boost circuit 4 filters and boosts the current output from the multiple-input dc converter 2, and then outputs a stable voltage.

In this embodiment, the first battery B1 and the second battery B2 of the device powered by different batteries operate in such a way that the first battery B1 sets a first under-voltage value and the second battery B2 sets a second under-voltage value.

When the sampling control circuit 3 collects that the output voltage of the first battery B1 is greater than the first under-voltage value and the output voltage of the second battery B2 is less than or equal to the second under-voltage value, the sampling control circuit 3 controls the first electronic switch Q9 to be conducted through the port PA0, controls the third electronic switch Q6 to be conducted through the port PB0 to output the PWM signal, and supplies power to the boost circuit 4 from the first battery B1, and the second electronic switch Q10 and the fourth electronic switch Q8 are not conducted.

When the sampling control circuit 3 collects that the output voltage of the first battery B1 is smaller than or equal to the first under-voltage value and the output voltage of the second battery B2 is larger than the second under-voltage value, the sampling control circuit 3 controls the second electronic switch Q10 to be conducted through the port PA1, controls the fourth electronic switch Q8 to be conducted through the port PB1 to output the PWM signal, and the second battery B2 supplies power to the boost circuit 4, so that the first electronic switch Q9 and the third electronic switch Q6 are not conducted.

When the sampling control circuit 3 collects that the output voltage of the first battery B1 is larger than a first under-voltage value and the output voltage of the second battery B2 is larger than a second under-voltage value, the sampling control circuit 3 controls the first electronic switch Q9 and the second electronic switch Q10 to be conducted through the port PA0 and the port PA 1; and the third electronic switch Q6 and the fourth electronic switch Q8 are alternately turned on in a period of microsecond order, so that the first battery B1 and the second battery B2 are alternately powered outwards. Specifically, the output voltage of the first battery B1 is U1, the output voltage of the second battery B2 is U2, the output time of the first battery B1 is T1, the output time of the second battery B2 is T2, the sampling control circuit 3 outputs PWM signals of fhz with the same ratio of the two duty ratios as the ratio of the voltage values of U1 and U2 to control the third electronic switch Q6 and the fourth electronic switch Q8 to be alternately turned on in a microsecond time period, so that the power output by the first battery B1 and the power output by the second battery B2 are superimposed, and then the stable voltage is output after the boost circuit 4 boosts the power. More specifically, e.g.When the third electronic switch Q6 is turned on, the fourth electronic switch Q8 is turned off, and the first battery B1 outputs a voltage U1; />When the fourth electronic switch Q8 is turned on, the third electronic switch Q6 is turned off, and the second battery B2 outputs a voltage U2; />When the third electronic switch Q6 is turned on, the fourth electronic switch Q8 is turned off, and the first battery B1 outputs a voltage U1; />In the time, the fourth electronic switch Q8 is turned on, the third electronic switch Q6 is turned off, the second batteryB2 outputs voltage U2; and sequentially cycling to enable the first battery B1 and the second battery B2 to alternately output voltages outwards.

In this embodiment, when the first battery B1 or the second battery B2 is lower than its own under-voltage value, the second control module U2 or the third control module U3 controls the battery with voltage higher than the under-voltage value to supply power to the sampling control circuit 3.

In addition, in this embodiment, the first electronic switch Q9 and the second electronic switch Q10 also function as a protection circuit to protect the power supply and prevent the lithium battery from overdischarging, when the first battery B1 or the second battery B2 is lower than its own under-voltage value, the sampling control circuit 3 timely controls the on-off of the first electronic switch Q9 and the second electronic switch Q10, so that the battery with the voltage lower than the under-voltage value is not discharged outwards any more. The first electronic switch Q9 is connected in series with the third electronic switch Q6, the second electronic switch Q10 is connected in series with the fourth electronic switch Q8, and the first electronic switch Q9 and the second electronic switch Q10 can also play a role in protecting the circuits in the whole device.

Example two

In this embodiment, one battery power supply device using different voltages in the first embodiment is adopted, the first battery B1 is a lithium iron phosphate battery, and the second battery B2 is a ternary lithium battery. The under-voltage value of the first battery B1 was 2.5V, and the under-voltage value of the second battery B2 was 3.2V. The average voltage output from the first battery B1 was 3.2V, and the average voltage output from the second battery B2 was 3.7V.

Specifically, when the sampling control circuit 3 collects that the output voltage of the first battery B1 is greater than 2.5V and the output voltage of the second battery B2 is less than or equal to 3.2V, the sampling control circuit 3 controls the first electronic switch Q9 to be turned on through the port PA0, controls the third electronic switch Q6 to be turned on through the port PB0 to output the PWM signal, the first battery B1 supplies power to the outside, and the second electronic switch Q10 and the fourth electronic switch Q8 are not turned on.

When the sampling control circuit 3 collects that the output voltage of the first battery B1 is less than or equal to 2.5V and the output voltage of the second battery B2 is greater than 3.2V, the sampling control circuit 3 controls the second electronic switch Q10 to be turned on through the port PA1, and controls the fourth electronic switch Q8 to be turned on through the port PB1 to output the PWM signal, the second battery B2 supplies power to the outside, and the first electronic switch Q9 and the third electronic switch Q6 are not turned on.

When the sampling control circuit 3 collects that the output voltage of the first battery B1 is greater than 2.5V and the output voltage of the second battery B2 is greater than 3.2V, the sampling control circuit 3 controls the first electronic switch Q9 and the second electronic switch Q10 to be conducted through the port PA0 and the port PA 1; and the third electronic switch Q6 and the fourth electronic switch Q8 are alternately turned on in a period of microsecond order, so that the first battery B1 and the second battery B2 are alternately powered outwards. Specifically, the output voltage of the first battery B1 is U1, the output voltage of the second battery B2 is U2, the output time of the first battery B1 is T1, the output time of the second battery B2 is T2, the sampling control circuit 3 outputs PWM signals with the duty ratio equal to and complementary to the voltage value ratio, which are on/off 10000 times, of two paths of 10000HZ to control the third electronic switch Q6 and the fourth electronic switch Q8 to be alternately conducted in a microsecond time period, so that the voltages output by the first battery B1 and the second battery B2 are superimposed, and then the stable 12V voltage is output after the boost circuit 4 boosts. More specifically, e.g.When the third electronic switch Q6 is turned on, the fourth electronic switch Q8 is turned off, and the first battery B1 outputs a voltage U1; />When the fourth electronic switch Q8 is turned on, the third electronic switch Q6 is turned off, and the second battery B2 outputs a voltage U2; />When the third electronic switch Q6 is turned on, the fourth electronic switch Q8 is turned off, and the first battery B1 outputs a voltage U1; />When the fourth electronic switch Q8 is turned on, the third electronic switch Q6 is turned off, and the second battery B2 outputs a voltage U2; the first battery B1 and the second battery B2 alternately output voltages to the outside while cycling in sequence.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (9)

1. The utility model provides a battery power supply device with different voltages, includes lithium cell module (1), many input direct current converter (2), sampling control circuit (3) and boost circuit (4), and lithium cell module (1) is connected with many input direct current converter (2) and sampling control circuit (3), and many input direct current converter (2) are connected with sampling control circuit (3) and boost circuit (4), its characterized in that:

the lithium battery module (1) comprises a first battery B1 and a second battery B2, wherein the first battery B1 is connected with a first electronic switch Q9, and the second battery B2 is connected with a second electronic switch Q10;

the multi-input direct current converter (2) comprises a first branch and a second branch, the first branch comprises a third electronic switch Q6, the input end of the third electronic switch Q6 is connected with a first electronic switch Q9, and the output end of the third electronic switch Q6 is connected with a boost circuit (4); the second branch circuit comprises a fourth electronic switch Q8, the input end of the fourth electronic switch Q8 is connected with a second electronic switch Q10, and the output end of the fourth electronic switch Q8 is connected with a boost circuit (4);

and the control ends of the third electronic switch Q6 and the fourth electronic switch Q8 are connected with a sampling control circuit (3), and when the voltages of the first battery B1 and the second battery B2 are larger than the respective undervoltage values, the sampling control circuit (3) controls the third electronic switch Q6 and the fourth electronic switch Q8 to be alternately switched on and off.

2. A battery powered device using different voltages as claimed in claim 1, wherein: the cathodes of the first battery B1 and the second battery B2 are connected; the positive electrode of the first battery B1 is connected with a first electronic switch Q9, and the output end of the first electronic switch Q9 is connected with a node VBAT1; the positive electrode of the second battery B2 is connected with a second electronic switch Q10, and the output end of the second electronic switch Q10 is connected with a node VBAT2.

3. A battery powered device using different voltages as claimed in claim 2, wherein: the input end of the third electronic switch Q6 is connected with the node VBAT1, and the output end is connected with the node IN+; the input end of the fourth electronic switch Q8 is connected with the node VBAT2, and the output end is connected with the node IN+.

4. A battery powered device using different voltages as claimed in claim 3, wherein: inputting the voltage output by the multi-input direct current converter (2) to a boost circuit (4) through the node IN+; the boost circuit (4) comprises an inductor L3 and a fourth control module U4, the node IN+ is connected with the inductor L3, the other end of the inductor L3 is connected with the fourth control module U4, and the voltage input by the node IN+ is boosted through the combined action of the inductor L3 and the fourth control module U4 and then is output through an output end VOUT.

5. A battery powered device using different voltages as claimed in claim 3 or 4, wherein: the first electronic switch Q9, the second electronic switch Q10, the third electronic switch Q6 and the fourth electronic switch Q8 are all MOS electronic switching tubes.

6. A battery powered device using different voltages as defined in claim 5, wherein: the sampling control circuit (3) comprises a first control module U1, wherein a port PA0 of the first control module U1 is connected with a G pole of a first electronic switch Q9 and is used for controlling the on-off of the first electronic switch Q9; the port PA1 of the first control module U1 is connected to the G pole of the second electronic switch Q10, and is used for controlling the on-off of the second electronic switch Q10.

7. A battery powered device using different voltages as defined in claim 6, wherein: the G pole of the third electronic switch Q6 is connected with a port PB0 of the first control module U1 through a node PWM0, so that the first control module U1 can control the on-off of the third electronic switch Q6; the G pole of the fourth electronic switch Q8 is connected to the port PB1 of the first control module U1 through the node PWM1, so that the first control module U1 can control the on/off of the fourth electronic switch Q8.

8. A battery powered device using different voltages as defined in claim 6, wherein: the positive electrode of the first battery B1 is connected with a node VM1, the node VM1 is connected with a port PA4 of the first control module U1, and the node VM1 is used for acquiring the output voltage of the first battery B1 by the first control module U1; the positive electrode of the second battery B2 is connected with the node VM2, and the node VM2 is connected with the port PA5 of the first control module U1 and is used for collecting the output voltage of the first battery B2 by the first control module U1.

9. A battery powered device using different voltages as defined in claim 8, wherein: the node VM1 is also connected with a second control module U2, and the second control module U2 is also connected with the first control module U1, so that the first battery B1 can supply power for the first control module U1; the node VM2 is further connected with a third control module U3, and the third control module U3 is further connected with the first control module U1, so that the second battery B2 can supply power for the first control module U1.