A battery management circuit for passive secondary loop inspection sources

Abstract

The application discloses a battery management circuit for passive secondary circuit inspection source, comprising a battery unit, a battery two switching unit, a battery three switching unit and a battery N switching unit, the working states of the battery one to the battery N include parallel connection and series connection, the switching is completed by the battery switching unit, the battery unit comprises a plurality of batteries and battery groups, the circuit is suitable for a plurality of battery groups, the battery two switching unit comprises parallel and series switching circuits of a battery two low end B2GND and parallel and series switching circuits of a battery two high end BAT2+, wherein the parallel and series switching circuits of the battery two low end B2GND comprise an isolation switch circuit and an N-type MOS half-bridge switching circuit, and the parallel and series switching circuits of the battery two high end BAT2+ comprise an isolation switch circuit and a P-type MOS half-bridge switching circuit. The application can meet the demand of current electrical equipment for multi-voltage power supply, improve the working efficiency of the power supply equipment and reduce the use cost of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic and electrical equipment, in particular to a battery management circuit for passive secondary loop inspection source. BACKGROUND

[0002] At present, various portable electronic and electrical products, instruments and meters need to be powered by batteries. The traditional battery power supply method is to connect the battery pack in series and parallel to form a fixed voltage to power the equipment. The series and parallel relationship of the battery remains unchanged during charging. This method has many disadvantages. Due to the differences in charging and discharging characteristics of each battery in the battery pack, long-term use will cause uneven charging and discharging of individual batteries, resulting in overcharging or overdischarging of individual batteries during use, affecting the service life of the battery. Single voltage power supply cannot meet the current demand for multi-voltage power supply of electrical equipment. Single power supply reduces the working efficiency of the power supply equipment and increases the use cost of the equipment. SUMMARY

[0003] The purpose of the present application is to provide a battery management circuit for passive secondary loop inspection source to solve the problems raised in the background.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a battery management circuit for passive secondary loop inspection source, comprising a battery unit and a battery switching unit, the battery unit comprising N battery packs, wherein N≥3 and N is a positive integer, and the battery packs are respectively denoted as battery one to battery N. The working state of the battery one to battery N includes parallel and series connection, and the switching between parallel and series connection is completed by the corresponding battery switching unit to battery N switching unit.

[0005] The battery switching unit comprises parallel and series switching circuit of battery low end and parallel and series switching circuit of battery high end. The parallel and series switching circuit of battery low end comprises isolation switch circuit and N-type MOS tube half-bridge switching circuit, and the parallel and series switching circuit of battery high end comprises isolation switch circuit and P-type MOS tube half-bridge switching circuit.

[0006] Preferably, the circuit principle of the battery two switching unit is implemented as follows:

[0007] 1a: When CL-K and BL-K1 are both high level 1, B2GND is connected in parallel to BAT+, and when CL-K and BL-K1 are both low level 0, B2GND is connected in series to BAT+.

[0008] 1b: the high end BAT2+ of the second battery is parallel to BAT+ or series to VOUT-2, which depends on the signal state of BL-K2, BL-K1 and CL-K, when the signals of BL-K2, BL-K1 and CL-K are high level 1 at the same time, BAT2+ is parallel to BAT+, when the signals of BL-K2, BL-K1 and CL-K are low level 0 at the same time, BAT2+ is series to VOUT-2;

[0009] 1c: when BL-K1 and BL-K2 are high level 1, CL-K cannot be low level 0 at the same time, so the rising edge of CL-K is ahead of the signals of BL-K1 and BL-K2 by tdh milliseconds, and the falling edge of CL-K lags behind the signals of BL-K1 and BL-K2 by tdl milliseconds when the series-parallel switching is performed.

[0010] Preferably, the circuit principle of the third battery switching unit is implemented as follows:

[0011] 2a: the low end B3GND of the third battery is parallel to BAT- or series to VOUT-2, which depends on the signal state of CL-K and BL-K1, when CL-K and BL-K1 are high level 1 at the same time, B3GND is parallel to BAT-, when CL-K and BL-K1 are low level 0 at the same time, B3GND is series to VOUT-2;

[0012] 2b: the high end BAT3+ of the third battery is parallel to BAT+ or series to VOUT-3, which depends on the signal state of BL-K2, BL-K1 and CL-K, when the signals of BL-K2, BL-K1 and CL-K are high level 1 at the same time, BAT3+ is parallel to BAT+, when the signals of BL-K2, BL-K1 and CL-K are low level 0 at the same time, BAT3+ is series to VOUT-3;

[0013] 2c: when BL-K1 and BL-K2 are high level 1, CL-K cannot be low level 0 at the same time, so the rising edge of CL-K is ahead of the signals of BL-K1 and BL-K2 by tdh milliseconds, and the falling edge of CL-K lags behind the signals of BL-K1 and BL-K2 by tdl milliseconds when the series-parallel switching is performed.

[0014] The technical effects and advantages of the present application are as follows:

[0015] The present application meets the current demand of multi-voltage power supply for electrical equipment, improves the working efficiency of power supply equipment, reduces the use cost of equipment, and makes the battery configuration of the battery unit more flexible, which can adapt to the output requirements of various voltage levels. The circuit of the battery N switching unit is simple, and the series-parallel connection of the battery pack can be programmed, which can provide BAT+, VOUT-2, VOUT-3……VOUT-N output voltages for the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Circuit diagram of the battery and battery management circuit of the present application.

[0017] Figure 2 Timing diagram of the BL-K1, BL-K2 and CL-K of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0019] The present application provides a battery management circuit for passive secondary circuit inspection source as shown in Figures 1-2 The battery management circuit for passive secondary circuit inspection source comprises a battery unit and a battery switching unit, the battery unit comprises N battery groups, wherein N≥3, and N is a positive integer, and the battery groups are respectively denoted as battery one to battery N, the working states of the battery one to battery N comprise parallel connection and series connection, and the switching between the parallel connection and the series connection is completed by the battery one switching unit to the battery N switching unit.

[0020] The battery switching unit comprises parallel and series switching circuits of a low end of the battery and parallel and series switching circuits of a high end of the battery, wherein the parallel and series switching circuits of the low end of the battery comprise an isolation switch circuit and an N-type MOS tube half-bridge switching circuit, and the parallel and series switching circuits of the high end of the battery comprise an isolation switch circuit and a P-type MOS tube half-bridge switching circuit.

[0021] Taking the battery two switching unit, the battery three switching unit and the battery N switching unit as examples for description.

[0022] The battery two switching unit is composed of the parallel and series switching circuits of the low end of the battery two (including the isolation switch circuit and the N-type MOS tube half-bridge switching circuit) and the parallel and series switching circuits of the high end of the battery two (including the isolation switch circuit and the P-type MOS tube half-bridge switching circuit) as shown in Figure 1

[0023] ​Circuit principle: the low end B2GND of the second battery is parallel to BAT- or series to BAT+, depending on the signal state of CL-K and BL-K1, when CL-K and BL-K1 are high level 1 at the same time, B2GND is parallel to BAT-, when CL-K and BL-K1 are low level 0 at the same time, B2GND is series to BAT+; the high end BAT2+ of the second battery is parallel to BAT+ or series to VOUT-2, depending on the signal state of BL-K2, BL-K1 and CL-K, when BL-K2, BL-K1 and CL-K are high level 1 at the same time, BAT2+ is parallel to BAT+, when BL-K2, BL-K1 and CL-K are low level 0 at the same time, BAT2+ is series to VOUT-2;

[0024] When BL-K1 and BL-K2 are high level 1, CL-K cannot be low level 0 at the same time, so when switching between parallel and series, the rising edge of CL-K leads BL-K1 and BL-K2 signal tdh milliseconds (tdh milliseconds refers to the time difference in circuit principle, not given specific value here), the falling edge of CL-K lags behind BL-K1 and BL-K2 signal tdl milliseconds, the timing relationship of BL-K1, BL-K2 and CL-K is shown in Figure 2 ;

[0025] The third battery switching unit is shown in Figure 1 , which is composed of parallel and series switching circuit of the low end B3GND of the third battery (including isolation switch circuit, N-type MOS half-bridge switching circuit) and parallel and series switching circuit of the high end BAT2+ of the third battery (including isolation switch circuit, P-type MOS half-bridge switching circuit); Circuit principle: the low end B3GND of the third battery is parallel to BAT- or series to VOUT-2, depending on the signal state of CL-K and BL-K1, when CL-K and BL-K1 are high level 1 at the same time, B3GND is parallel to BAT-, when CL-K and BL-K1 are low level 0 at the same time, B3GND is series to VOUT-2, the high end BAT3+ of the third battery is parallel to BAT+ or series to VOUT-3, depending on the signal state of BL-K2, BL-K1 and CL-K, when BL-K2, BL-K1 and CL-K are high level 1 at the same time, BAT3+ is parallel to BAT+, when BL-K2, BL-K1 and CL-K are low level 0 at the same time, BAT3+ is series to VOUT-3;

[0026] When BL-K1 and BL-K2 are high level 1, CL-K cannot be low level 0 at the same time, so when the series-parallel switching is performed, the rising edge of CL-K is ahead of the BL-K1 and BL-K2 signals by tdh milliseconds, the falling edge of CL-K lags behind the BL-K1 and BL-K2 signals by tdl milliseconds, and the timing relationship of BL-K1, BL-K2 and CL-K is shown in the following figure Figure 2 ;

[0027] The battery N switching unit is shown in the following figure Figure 1 The series-parallel connection of multiple battery groups can be realized by referring to the circuits of the battery three switching unit and the battery two switching unit.

[0028] Advantages: simple circuit, programmable series-parallel connection of battery groups, BAT+, VOUT-2, VOUT-3, …, VOUT-N output voltages can be provided for the circuit.

[0029] The lithium battery power supply management circuit includes a lithium battery charging and discharging management chip, a lithium battery protection chip circuit, a lithium battery, a USB charging input port and a DCDC+5V-3.3V conversion circuit, mainly completes the overcharge and overdischarge protection of the lithium battery, provides working energy for the entire power supply circuit, and has a direct current power supply conversion function, wherein +5V and 3.3V are power supply sources, and BAT+ and BAT- are lithium battery positive and negative power output.

[0030] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery management circuit for passive secondary loop inspection source, comprising battery units and battery switching units, the battery units comprising N battery groups, where N≥3 and N is a positive integer, respectively denoted as battery one to battery N, the working states of battery one to battery N comprising parallel and series, the switching of parallel and series being accomplished by corresponding battery switching units to battery N switching units; the battery switching units comprising parallel and series switching circuits of battery low end and parallel and series switching circuits of battery high end, wherein the parallel and series switching circuits of battery low end comprise isolation switch circuit and N-type MOS tube half-bridge switching circuit, and the parallel and series switching circuits of battery high end comprise isolation switch circuit and P-type MOS tube half-bridge switching circuit; the circuit principle of battery two switching unit is implemented as follows: 1a: when CL-K and BL-K1 are both high level 1, B2GND is connected in parallel to BAT+, and when CL-K and BL-K1 are both low level 0, B2GND is connected in series to BAT+; 1b: whether the high end BAT2+ of battery two is connected in parallel to BAT+ or in series to VOUT-2 depends on the signal states of BL-K2, BL-K1 and CL-K, when the signals of BL-K2, BL-K1 and CL-K are all high level 1, BAT2+ is connected in parallel to BAT+, and when the signals of BL-K2, BL-K1 and CL-K are all low level 0, BAT2+ is connected in series to VOUT-2; 1c: when BL-K1 and BL-K2 are high level 1, CL-K cannot be low level 0 at the same time, so in the switching of series and parallel, the rising edge of CL-K leads the signals of BL-K1 and BL-K2 by tdh milliseconds, and the falling edge of CL-K lags behind the signals of BL-K1 and BL-K2 by tdl milliseconds.

2. A battery management circuit for a passive secondary loop inspection source according to claim 1, wherein, the circuit principle of battery three switching unit is implemented as follows: 2a: whether the low end B3GND of battery three is connected in parallel to BAT- or in series to VOUT-2 depends on the signal states of CL-K and BL-K1, when CL-K and BL-K1 are both high level 1, B3GND is connected in parallel to BAT-, and when CL-K and BL-K1 are both low level 0, B3GND is connected in series to VOUT-2; 2b: whether the high end BAT3+ of battery three is connected in parallel to BAT+ or in series to VOUT-3 depends on the signal states of BL-K2, BL-K1 and CL-K, when the signals of BL-K2, BL-K1 and CL-K are all high level 1, BAT3+ is connected in parallel to BAT+, and when the signals of BL-K2, BL-K1 and CL-K are all low level 0, BAT3+ is connected in series to VOUT-3; 2c: when BL-K1 and BL-K2 are high level 1, CL-K cannot be low level 0 at the same time, so in the switching of series and parallel, the rising edge of CL-K leads the signals of BL-K1 and BL-K2 by tdh milliseconds, and the falling edge of CL-K lags behind the signals of BL-K1 and BL-K2 by tdl milliseconds.

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