Uninterrupted battery switching power supply circuit

Abstract

Provided is an uninterrupted battery switching power supply circuit. Each battery pack is connected with a voltage acquisition circuit and a power supply circuit. Each battery pack is electrically connected with the equipment through a power supply circuit; the voltage acquisition circuit acquires battery pack voltage and sends the battery pack voltage to the control unit; the power supply circuit comprises a first power tube and a second power tube which are connected in series between the battery pack and the equipment; the drain electrode of the first power tube is connected with the positive electrode of the battery pack, the source electrode of the first power tube is connected with the source electrode of the second power tube, and the drain electrode of the second power tube is connected with the input end of equipment; the control unit controls on-off of the first power tube through the first control port and controls on-off of the second power tube through the second control port. Compared with the scheme of transient power failure caused by battery switching or power supply supported by a large capacitor in the market, the technical scheme provided by the utility model can realize uninterrupted switching, and equipment work is not influenced by power supply switching.

Description

Technical Field

[0001] The utility model relates to the field of battery management circuits, in particular to an uninterrupted battery switching power supply circuit. Background Art

[0002] With the rapid development of lithium batteries, more and more products are powered by lithium battery packs. However, due to the pursuit of portability and other characteristics, the capacity of the battery packs designed by manufacturers at the beginning is relatively small. As the power of electronic equipment continues to increase, the short power supply time of the battery pack cannot meet the demand. In order to achieve long-term continuous power supply of the battery pack, during the power supply process, one way is to use multiple battery packs to switch to continuous power supply. If the battery power in one way cannot maintain the operation of the device, it is powered by switching to the next way. This method has the following defects:

[0003] When one battery circuit is too low and the next circuit is started directly, the high-voltage battery charges the low-voltage battery violently, and the current flows back to the low-voltage battery circuit, causing battery damage. When one battery circuit is turned off and the next circuit is started, there is an intermittent process, causing other devices to enter undervoltage protection. Therefore, in order to solve the above problems, an uninterrupted battery switching power supply circuit and its working method are needed. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model proposes an uninterruptible battery switching power supply circuit.

[0005] An uninterruptible battery switching power supply circuit, characterized in that:

[0006] It includes a battery pack and a control unit, wherein the battery pack has at least two groups;

[0007] Each group of battery packs is connected to a voltage collection circuit and a power supply circuit;

[0008] Each group of battery packs is electrically connected to the device via the power supply circuit;

[0009] The voltage collection circuit collects the battery pack voltage and sends it to the control unit;

[0010] The power supply circuit includes a first power tube and a second power tube connected in series between the battery pack and the device;

[0011] The drain of the first power tube is connected to the positive electrode of the battery pack, the source of the first power tube is connected to the source of the second power tube, and the drain of the second power tube is connected to the input terminal of the device;

[0012] The control unit controls the switching of the first power tube through a first control port, and controls the switching of the second power tube through a second control port.

[0013] In order to better implement the present utility model, it can further include: a battery pack B1 and a battery pack B2;

[0014] The battery pack B1 has a voltage collection circuit E1 and a power supply circuit C1. The battery pack B1 is electrically connected to the device through the power supply circuit C1. The voltage collection circuit E1 collects the voltage of the battery pack B1 and sends it to the control unit.

[0015] The battery pack B2 has a voltage collection circuit E2 and a power supply circuit C2. The battery pack B2 is electrically connected to the device via the power supply circuit C2. The voltage collection circuit E2 collects the voltage of the battery pack B2 and sends it to the control unit.

[0016] Further: the power supply circuit C1 includes a MOS tube Q9 and a MOS tube Q10 connected in series between the battery and the device, the drain of the MOS tube Q9 is connected to the positive electrode of the battery, the source of the MOS tube Q9 is connected to the source of the MOS tube Q10, the gate of the MOS tube Q9 is connected to the first end of the resistor R60, the second end of the resistor R60 is connected to the first control port, the drain of the MOS tube Q10 is connected to the input end of the device, the gate of the MOS tube Q10 is connected to the first end of the resistor R59, the second end of the resistor R59 is connected to the second control port, and the control unit sends control signals to the first control port and the second control port respectively.

[0017] Further: the power supply circuit C2 includes a MOS tube Q16 and a MOS tube Q17 connected in series between the battery and the device, the drain of the MOS tube Q16 is connected to the positive electrode of the battery, the source of the MOS tube Q16 is connected to the source of the MOS tube Q17, the gate of the MOS tube Q16 is connected to the first end of the resistor R105, the second end of the resistor R105 is connected to the third control port, the drain of the MOS tube Q17 is connected to the input end of the device, the gate of the MOS tube Q17 is connected to the first end of the resistor R104, the second end of the resistor R104 is connected to the fourth control port, and the control unit sends control signals to the first control port and the second control port respectively.

[0018] Further: the voltage collection circuit E1 includes a transistor G2, the emitter of the transistor G2 is grounded, one branch of the base of the transistor G2 is grounded via a resistor R75, and the other branch is connected to the fifth control port via a resistor R70;

[0019] The collector of the transistor G2 is connected to the gate of the MOS transistor Q11 via the resistors R71, R72, R73 and R74 connected in parallel, and the source of the MOS transistor Q11 is connected to the sampling input port, which collects the corresponding battery pack voltage;

[0020] The drain of the MOS tube Q11 is connected to the resistor R67 via the resistor R68. The other end of the resistor R67 is connected to the sampling output port. The sampling input port collects the voltage of the cell pack B1.

[0021] Further: the voltage collection circuit E2 includes a transistor G3, the emitter of the transistor G3 is grounded, one branch of the base of the transistor G3 is grounded via a resistor R120, and the other branch is connected to the fifth control port via a resistor R115;

[0022] The collector of the transistor G3 is connected to the gate of the MOS transistor Q18 via the resistors R116, R117, R118 and R119 connected in parallel, and the source of the MOS transistor Q18 is connected to the sampling input port, which collects the voltage of the pool package B2;

[0023] The drain of the MOS tube Q18 is connected to the resistor R112 via the resistor R113. The other end of the resistor R112 is connected to the sampling output port, and the sampling output port is connected to the control port of the control unit.

[0024] The beneficial effects of the utility model are as follows: through this technical solution, the service life of the product can be greatly increased, and there is no need to develop a new battery pack for the new product, which increases the reusability of the existing battery pack. Most importantly, compared with the short power outage caused by battery switching in the market or the power supply solution supported by a large capacitor, which causes the equipment to shut down, this technology can achieve uninterrupted switching, and the operation of the equipment will not be affected by switching the power supply. Through the cooperation of two MOS tubes in opposite directions, a short-term freewheeling is achieved when switching the circuit, avoiding the voltage difference formed between the two circuits, which causes the current to flow back and burn the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a working schematic diagram of the utility model;

[0026] Figure 2 It is the connection diagram of the battery pack B1 and the power supply circuit C1;

[0027] Figure 3 This is the circuit diagram of the voltage acquisition circuit E1;

[0028] Figure 4 is a switch driving circuit diagram of the power supply circuit C1;

[0029] Figure 5 It is the connection diagram of the battery pack B1 and the power supply circuit C1;

[0030] Figure 6 This is the circuit diagram of the voltage acquisition circuit E1;

[0031] Figure 7 FIG. 4 is a switch driving circuit diagram of the power supply circuit C1. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1 As shown:

[0034] An uninterruptible battery switching power supply circuit comprises a battery pack and a control unit, wherein the battery packs are at least two groups; each group of battery packs is connected to a voltage collection circuit and a power supply circuit; each group of battery packs is electrically connected to a device through the power supply circuit; the voltage collection circuit collects the battery pack voltage and sends it to the control unit; the power supply circuit comprises a first power tube and a second power tube connected in series between the battery pack and the device;

[0035] The drain of the first power tube is connected to the positive electrode of the battery pack, the source of the first power tube is connected to the source of the second power tube, and the drain of the second power tube is connected to the input terminal of the device;

[0036] The control unit controls the switching of the first power tube through the first control port, and controls the switching of the second power tube through the second control port.

[0037] like Figures 2 to 7 As shown, this embodiment uses two battery packs, including a battery pack B1 and a battery pack B2;

[0038] The battery pack B1 has a voltage collection circuit E1 and a power supply circuit C1. The battery pack B1 is electrically connected to the device through the power supply circuit C1. The voltage collection circuit E1 collects the voltage of the battery pack B1 and sends it to the control unit.

[0039] The power supply circuit C1 includes a MOS transistor Q9 and a MOS transistor Q10 connected in series between a battery and a device, a drain of the MOS transistor Q9 is connected to a positive electrode of the battery, a source of the MOS transistor Q9 is connected to a source of the MOS transistor Q10, a gate of the MOS transistor Q9 is connected to a first end of a resistor R60, a second end of the resistor R60 is connected to a first control port, a drain of the MOS transistor Q10 is connected to an input end of the device, a gate of the MOS transistor Q10 is connected to a first end of a resistor R59, a second end of the resistor R59 is connected to a second control port, and the control unit sends control signals to the first control port and the second control port respectively.

[0040] The voltage collection circuit E1 includes a transistor G2, the emitter of the transistor G2 is grounded, one branch of the base of the transistor G2 is grounded via a resistor R75, and the other branch is connected to the fifth control port via a resistor R70;

[0041] The collector of the transistor G2 is connected to the gate of the MOS transistor Q11 via the resistors R71, R72, R73 and R74 connected in parallel, and the source of the MOS transistor Q11 is connected to the sampling input port, which collects the corresponding battery pack voltage;

[0042] The drain of the MOS tube Q11 is connected to the resistor R67 via the resistor R68. The other end of the resistor R67 is connected to the sampling output port. The sampling input port collects the voltage of the cell pack B1.

[0043] The battery pack B2 has a voltage collection circuit E2 and a power supply circuit C2. The battery pack B2 is electrically connected to the device via the power supply circuit C2. The voltage collection circuit E2 collects the voltage of the battery pack B2 and sends it to the control unit.

[0044] The power supply circuit C2 includes a MOS transistor Q16 and a MOS transistor Q17 connected in series between the battery and the device, the drain of the MOS transistor Q16 is connected to the positive electrode of the battery, the source of the MOS transistor Q16 is connected to the source of the MOS transistor Q17, the gate of the MOS transistor Q16 is connected to the first end of the resistor R105, the second end of the resistor R105 is connected to the third control port, the drain of the MOS transistor Q17 is connected to the input end of the device, the gate of the MOS transistor Q17 is connected to the first end of the resistor R104, the second end of the resistor R104 is connected to the fourth control port, and the control unit sends control signals to the first control port and the second control port respectively.

[0045] The voltage collection circuit E2 includes a transistor G3, the emitter of the transistor G3 is grounded, one branch of the base of the transistor G3 is grounded via a resistor R120, and the other branch is connected to the fifth control port via a resistor R115;

[0046] The collector of the transistor G3 is connected to the gate of the MOS transistor Q18 via the resistors R116, R117, R118 and R119 connected in parallel, and the source of the MOS transistor Q18 is connected to the sampling input port, which collects the voltage of the pool package B2;

[0047] The drain of the MOS tube Q18 is connected to the resistor R112 via the resistor R113. The other end of the resistor R112 is connected to the sampling output port, and the sampling output port is connected to the control port of the control unit.

[0048] A working method of an uninterruptible battery switching power supply circuit, comprising a battery pack B1 and a battery pack B2, wherein a voltage acquisition circuit E1 acquires a voltage V1 of the battery pack B1 and sends it to a control unit, and a voltage acquisition circuit E2 acquires a voltage V2 of the battery pack B2 and sends it to a control unit, thereby obtaining a voltage data group including a voltage V1 and a voltage V2, wherein the voltage V1≥V2≥V S .

[0049] S2: The control unit selects the maximum voltage V in the voltage data group a , V a = V1, when the maximum voltage V a >Safety voltage threshold V S , the control unit is based on the maximum voltage V a Determine that battery pack B1 is the power supply;

[0050] S3: The control unit controls the second power tube Q10 and the first power tube Q9 in the power supply circuit C1 to be turned on in sequence, and the battery pack B1 supplies power to the device;

[0051] S4: When the voltage of battery pack B1 is lower than the safety voltage threshold V S , the control unit controls the second power tube Q10 in the power supply circuit C1 to turn off, and the power supply circuit C1 uses the internal diode of the second power tube Q10 to continuously supply power to the device;

[0052] S5: In the voltage data group, there is a voltage greater than the safety voltage threshold V S When the voltage value is , the control unit selects the maximum voltage V in the voltage data group according to step S2. b = V2, re-determine the battery pack B2 as the power supply source, and power the device according to step S3. When the battery pack B2 is powered successfully, the control unit controls the first power tube Q9 in the power supply circuit C1 to turn off, and the power of the battery pack B1 is cut off. The control unit processes the battery pack B2 according to step S4;

[0053] S6: Follow the S4-S5 cycle until the voltages of battery pack B1 and battery pack B2 are both lower than the safety voltage threshold V S .

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An uninterruptible battery switching power supply circuit, characterized in that: It includes a battery pack and a control unit, wherein the battery pack has at least two groups; Each group of battery packs is connected to a voltage collection circuit and a power supply circuit; Each group of battery packs is electrically connected to the device via the power supply circuit; The voltage collection circuit collects the battery pack voltage and sends it to the control unit; The power supply circuit includes a first power tube and a second power tube connected in series between the battery pack and the device; The drain of the first power tube is connected to the positive electrode of the battery pack, the source of the first power tube is connected to the source of the second power tube, and the drain of the second power tube is connected to the input terminal of the device; The control unit controls the switching of the first power tube through a first control port, and controls the switching of the second power tube through a second control port.

2. The uninterruptible battery switching power supply circuit according to claim 1, characterized in that: Includes battery pack B1 and battery pack B2; The battery pack B1 has a voltage collection circuit E1 and a power supply circuit C1. The battery pack B1 is electrically connected to the device through the power supply circuit C1. The voltage collection circuit E1 collects the voltage of the battery pack B1 and sends it to the control unit. The battery pack B2 has a voltage collection circuit E2 and a power supply circuit C2. The battery pack B2 is electrically connected to the device via the power supply circuit C2. The voltage collection circuit E2 collects the voltage of the battery pack B2 and sends it to the control unit.

3. The uninterruptible battery switching power supply circuit according to claim 2, characterized in that: The power supply circuit C1 includes a MOS transistor Q9 and a MOS transistor Q10 connected in series between a battery and a device, a drain of the MOS transistor Q9 is connected to a positive electrode of the battery, a source of the MOS transistor Q9 is connected to a source of the MOS transistor Q10, a gate of the MOS transistor Q9 is connected to a first end of a resistor R60, a second end of the resistor R60 is connected to a first control port, a drain of the MOS transistor Q10 is connected to an input end of the device, a gate of the MOS transistor Q10 is connected to a first end of a resistor R59, a second end of the resistor R59 is connected to a second control port, and the control unit sends control signals to the first control port and the second control port respectively.

4. The uninterruptible battery switching power supply circuit according to claim 3, characterized in that: The power supply circuit C2 includes a MOS transistor Q16 and a MOS transistor Q17 connected in series between the battery and the device, the drain of the MOS transistor Q16 is connected to the positive electrode of the battery, the source of the MOS transistor Q16 is connected to the source of the MOS transistor Q17, the gate of the MOS transistor Q16 is connected to the first end of the resistor R105, the second end of the resistor R105 is connected to the third control port, the drain of the MOS transistor Q17 is connected to the input end of the device, the gate of the MOS transistor Q17 is connected to the first end of the resistor R104, the second end of the resistor R104 is connected to the fourth control port, and the control unit sends control signals to the first control port and the second control port respectively.

5. The uninterruptible battery switching power supply circuit according to claim 4, characterized in that: The voltage collection circuit E1 includes a transistor G2, the emitter of the transistor G2 is grounded, one branch of the base of the transistor G2 is grounded via a resistor R75, and the other branch is connected to the fifth control port via a resistor R70; The collector of the transistor G2 is connected to the gate of the MOS transistor Q11 via the resistors R71, R72, R73 and R74 connected in parallel, and the source of the MOS transistor Q11 is connected to the sampling input port, which collects the corresponding battery pack voltage; The drain of the MOS tube Q11 is connected to the resistor R67 via the resistor R68. The other end of the resistor R67 is connected to the sampling output port. The sampling input port collects the voltage of the cell pack B1.

6. The uninterruptible battery switching power supply circuit according to claim 5, characterized in that: The voltage collection circuit E2 includes a transistor G3, the emitter of the transistor G3 is grounded, one branch of the base of the transistor G3 is grounded via a resistor R120, and the other branch is connected to the fifth control port via a resistor R115; The collector of the transistor G3 is connected to the gate of the MOS transistor Q18 via the resistors R116, R117, R118 and R119 connected in parallel, and the source of the MOS transistor Q18 is connected to the sampling input port, which collects the voltage of the pool package B2; The drain of the MOS tube Q18 is connected to the resistor R112 via the resistor R113. The other end of the resistor R112 is connected to the sampling output port, and the sampling output port is connected to the control port of the control unit.

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