Double-battery-pack switching circuit

Abstract

The utility model provides a double battery pack switching circuit, which comprises two control branches in one-to-one correspondence with two battery packs, each control branch comprises a comparison module used for comparing the voltage of the corresponding battery pack with a reference voltage and a driver used for generating a driving signal according to the output result of the comparison module, the switch module is used for opening and closing the output of the corresponding battery pack according to the driving signal; the reference voltage module is used for providing reference voltage for the comparison module; the channel locking module is used for controlling the power supply states of the two battery packs according to comparison results of the comparison modules of the two control branches; and the filtering module is used for filtering the voltage output by the two switch modules and outputting the filtered voltage to an uninterruptible power supply inverter. The double-battery-pack switching circuit provided by the utility model can realize automatic switching of double battery packs while the capacity of the battery packs is expanded, thereby protecting the battery packs.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a dual battery pack switching circuit. Background Art

[0002] At present, almost all the uninterruptible power supplies and inverters on the market are input applications of a single battery pack. After the battery pack is discharged, the single battery pack has to be shut down and powered off, otherwise the battery pack will be damaged due to deep discharge. In the prior art, the solution of directly connecting the battery pack to the uninterruptible power supply inverter is usually adopted. Although this solution is simple and convenient, if the old lead-acid battery pack is used for power supply, the volume of the large-capacity battery pack system is very large, and the space requirement for the computer room is very large. If a lithium battery pack is used for power supply, only a single battery pack solution can be used, because the lithium battery pack busbar cannot be directly used in parallel, and the capacity of the single battery pack direct power supply solution is destined to not be too large, so the battery pack capacity is limited. Therefore, when the load power is large, the power will be consumed faster, and the power cannot be supplied for a long time. If the city power is cut off for a long time, the electrical equipment will be forced to shut down or shut down to replace the battery pack.

[0003] In order to solve the problem of insufficient capacity of a single battery pack and the problem that lithium battery packs are not suitable for parallel use, two battery packs can be connected in parallel to form a dual battery pack through a diode circuit. This can expand the range of usage scenarios of the uninterruptible power supply. However, this solution cannot obtain the remaining power of the battery pack, which may cause the battery pack to be over-discharged and fail to disconnect the low-power battery pack circuit in time, affecting the battery pack life. Utility Model Content

[0004] The dual battery pack switching circuit provided by the utility model can realize automatic switching of the dual battery packs while expanding the capacity of the battery packs, thereby protecting the battery packs.

[0005] The utility model provides a dual battery pack switching circuit, comprising:

[0006] Two control branches corresponding to the two battery packs, the control branches comprising a comparison module for comparing the voltage of the corresponding battery pack with a reference voltage, a driver for generating a drive signal according to an output result of the comparison module, and a switch module for turning on and off the output of the corresponding battery pack according to the drive signal;

[0007] A reference voltage module, used for providing a reference voltage to the comparison module;

[0008] A channel locking module, used for controlling the power supply status of the two battery packs according to the comparison results of the comparison modules of the two control branches;

[0009] The filter module is used to filter the voltage output by the two switch modules and output it to the uninterruptible power supply inverter so that the uninterruptible power supply inverter can supply power to the electrical equipment.

[0010] Optionally, it also includes:

[0011] A power module is electrically connected to the two battery packs and is used to convert the voltage of at least one of the two battery packs into a first predetermined voltage and then provide power to the two comparison modules, the two drivers and the reference voltage module.

[0012] Optionally, the comparison module includes:

[0013] a first resistor, wherein a first end of the first resistor is electrically connected to an output electrode of a corresponding battery pack;

[0014] a second resistor, a first end of the second resistor being electrically connected to a second end of the first resistor, and a second end of the second resistor being grounded;

[0015] a first capacitor, wherein a first end of the first capacitor is electrically connected to a second end of the first resistor, and a second end of the first capacitor is grounded;

[0016] A first comparator, wherein a first input terminal of the first comparator is electrically connected to a first terminal of the first capacitor, and a second input terminal of the first comparator is electrically connected to an output terminal of the reference voltage module;

[0017] a second capacitor, wherein a first end of the second capacitor is electrically connected to the second input end of the first comparator, and a second end of the second capacitor is grounded;

[0018] A third resistor, wherein a first end of the third resistor is electrically connected to a power supply pin of the first comparator, and a second end of the third resistor is electrically connected to an output end of the first comparator.

[0019] Optionally, the driver comprises:

[0020] A driving chip, wherein a negative input pin of a control end of the driving chip is electrically connected to an output end of the comparator, and a voltage source pin of a controlled end of the driving chip is electrically connected to a corresponding output electrode of a battery pack;

[0021] a fourth resistor, wherein a first end of the fourth resistor is electrically connected to the power module, and a second end of the fourth resistor is electrically connected to a control positive input pin of the driving chip;

[0022] a fifth resistor, a first end of the fifth resistor being electrically connected to a controlled end output pin of the driving chip;

[0023] A first diode, wherein a first end of the first diode is electrically connected to a first end of the fifth resistor, and a second end of the first diode is electrically connected to a second end of the fifth resistor.

[0024] Optionally, the power module includes:

[0025] a second diode, wherein a first end of the second diode is electrically connected to an output electrode of one of the battery groups;

[0026] a third capacitor, a first end of the third capacitor being electrically connected to the second end of the second diode, and a second end of the third capacitor being grounded;

[0027] a third diode, wherein a first end of the third diode is electrically connected to an output electrode of another battery group, and a second end of the third diode is electrically connected to a second end of the second diode;

[0028] a fourth capacitor, wherein a first end of the fourth capacitor is electrically connected to the second end of the third diode, and a second end of the fourth capacitor is grounded;

[0029] a buck chip, wherein an input end of the buck chip is electrically connected to the second end of the third diode, and an output end of the buck chip is used to output a target voltage;

[0030] a fifth capacitor, wherein a first end of the fifth capacitor is electrically connected to the output end of the buck chip, and a second end of the fifth capacitor is grounded;

[0031] a sixth capacitor, wherein a first end of the sixth capacitor is electrically connected to the first end of the fifth capacitor, and a second end of the sixth capacitor is grounded;

[0032] A seventh capacitor, wherein a first end of the seventh capacitor is electrically connected to a first end of the sixth capacitor, and a second end of the seventh capacitor is grounded; and a first end of the seventh capacitor is electrically connected to two comparison modules, two drivers and a reference voltage module.

[0033] Optionally, the switch module includes:

[0034] a first controllable switch, wherein a control end of the first controllable switch is electrically connected to an output end of the driver, and an output end of the first controllable switch is electrically connected to the filter module;

[0035] an eighth capacitor, wherein a first end of the eighth capacitor is electrically connected to the control end of the first controllable switch, and a second end of the eighth capacitor is electrically connected to the input end of the first controllable switch;

[0036] a sixth resistor, wherein a first end of the sixth resistor is electrically connected to a first end of the eighth capacitor, and a second end of the sixth resistor is electrically connected to a second end of the eighth capacitor;

[0037] A fourth diode, wherein a first end of the fourth diode is electrically connected to the input end of the first controllable switch, and a second end of the fourth diode is electrically connected to the output electrode of the corresponding battery pack.

[0038] Optionally, the channel locking module includes locking branches corresponding to the two comparison modules respectively, wherein the locking branches include:

[0039] a second controllable switch, wherein an input terminal of the second controllable switch is electrically connected to an output terminal of one of the comparison modules, and an output terminal of the second controllable switch is grounded;

[0040] a seventh resistor, wherein a first end of the seventh resistor is electrically connected to the control end of the second controllable switch, and a second end of the seventh resistor is electrically connected to the output end of the second controllable switch;

[0041] a third controllable switch, wherein an input end of the third controllable switch is electrically connected to a control end of the second controllable switch, and an output end of the third controllable switch is grounded;

[0042] an eighth resistor, a first end of the eighth resistor being electrically connected to the control end of the second controllable switch, and a second end of the eighth resistor being electrically connected to the control end of the third controllable switch;

[0043] a ninth resistor, wherein a first end of the ninth resistor is electrically connected to the first end of the eighth resistor, and a second end of the ninth resistor is electrically connected to an output end of another comparison module;

[0044] A tenth resistor, wherein a first end of the tenth resistor is electrically connected to the control end of the third controllable switch, and a second end of the tenth resistor is electrically connected to a control signal source for simultaneously starting power supply of two battery packs.

[0045] Optionally, the filtering module includes:

[0046] A first inductor, wherein a first end of the first inductor is electrically connected to output ends of the two switch modules, and a second end of the first inductor is electrically connected to the uninterruptible power supply inverter;

[0047] a ninth capacitor, wherein a first end of the ninth capacitor is electrically connected to the second end of the first inductor, and a second end of the ninth capacitor is grounded;

[0048] a tenth capacitor, wherein a first end of the tenth capacitor is electrically connected to the first end of the ninth capacitor, and a second end of the tenth capacitor is grounded;

[0049] An eleventh capacitor, wherein a first end of the eleventh capacitor is electrically connected to a first end of the tenth capacitor, and a second end of the eleventh capacitor is grounded.

[0050] Optionally, the reference voltage module includes:

[0051] an eleventh resistor, a first end of the eleventh resistor being electrically connected to the power module;

[0052] a twelfth resistor, a first end of the twelfth resistor being electrically connected to a second end of the eleventh resistor;

[0053] a thirteenth resistor, a first end of the thirteenth resistor being electrically connected to the second end of the twelfth resistor, and a second end of the thirteenth resistor being grounded;

[0054] a twelfth capacitor, a first end of the twelfth capacitor being electrically connected to the first end of the thirteenth resistor, and a second end of the twelfth capacitor being grounded;

[0055] A voltage regulator tube, wherein a reference pin of the voltage regulator tube is electrically connected to the first end of the twelfth capacitor, a cathode pin of the voltage regulator tube is electrically connected to the first end of the twelfth resistor, and an anode pin of the voltage regulator tube is grounded;

[0056] A thirteenth capacitor, a first end of the thirteenth capacitor is electrically connected to the cathode pin of the voltage regulator tube, and a second end of the thirteenth capacitor is grounded;

[0057] A fourteenth capacitor, wherein a first end of the fourteenth capacitor is electrically connected to a first end of the thirteenth capacitor, a second end of the fourteenth capacitor is grounded, and a first end of the fourteenth capacitor is used to output a reference voltage.

[0058] Optionally, an uninterruptible power supply inverter is further included, the input end of the uninterruptible power supply inverter is electrically connected to the output end of the filter module, and the uninterruptible power supply inverter is also used to send a dual-channel opening or closing signal to the channel locking module.

[0059] The solution provided by the utility model is suitable for low-voltage DC power supply occasions, especially in the electrical system of battery emergency power supply. The technical solution provided by the utility model can provide a redundant design solution for battery power supply in the power supply system, in which one battery pack can be automatically and seamlessly switched to another battery pack after the discharge is completed, and when one battery pack is discharged, it can be manually replaced with another fully charged new battery pack without stopping the machine, which does not affect the use of electrical equipment and does not require stopping and waiting. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a schematic diagram of a dual battery pack switching circuit according to an embodiment of the present utility model;

[0061] Figure 2 It is a schematic diagram of a comparison module of a dual battery pack switching circuit according to another embodiment of the utility model;

[0062] Figure 3 A schematic diagram of a driver of a dual battery pack switching circuit according to another embodiment of the present invention;

[0063] Figure 4 A schematic diagram of a power module of a dual battery pack switching circuit according to another embodiment of the utility model;

[0064] Figure 5 A schematic diagram of a switch module of a dual battery pack switching circuit according to another embodiment of the present invention;

[0065] Figure 6 A schematic diagram of a locking branch of a dual battery pack switching circuit according to another embodiment of the utility model;

[0066] Figure 7 It is a schematic diagram of a filter module of a dual battery pack switching circuit according to another embodiment of the utility model;

[0067] Figure 8 It is a schematic diagram of a reference voltage module of a dual battery pack switching circuit according to another embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of 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.

[0069] The utility model embodiment provides a dual battery pack switching circuit, such as Figure 1 As shown, including:

[0070] Two control branches corresponding to the two battery packs, the control branches comprising a comparison module for comparing the voltage of the corresponding battery pack with a reference voltage, a driver for generating a drive signal according to an output result of the comparison module, and a switch module for turning on and off the output of the corresponding battery pack according to the drive signal;

[0071] A reference voltage module, used for providing a reference voltage to the comparison module;

[0072] A channel locking module, used for controlling the power supply status of the two battery packs according to the comparison results of the comparison modules of the two control branches;

[0073] The filter module is used to filter the voltage output by the two switch modules and output it to the uninterruptible power supply inverter so that the uninterruptible power supply inverter can supply power to the electrical equipment.

[0074] In some embodiments, after the dual battery pack switching circuit is correctly connected to the circuit, the voltage generated by the battery pack provides power to the power supply system through the low-voltage DC bus. The comparison module compares the voltage collected from the bus with the reference voltage. If the collected DC bus voltage signal is greater than the reference voltage signal, it means that the battery pack has a large amount of power and can provide the energy required by the system. The comparator outputs a high-level signal, otherwise it outputs a low-level signal. After this signal is transmitted to the driver, the driver turns on or off the output signal, thereby realizing the conduction or cutoff of the switch module. When the switch module is turned on, the current reaches the filter module through a bus section, and the voltage and current are sent from the two bus sections to the uninterruptible power supply inverter after passing through the filter module.

[0075] Before the dual battery packs are forcibly turned on for power supply, the battery pack that is connected first is selected to power the battery pack through the control of the channel locking module. For example, after one of the battery packs is connected first, the corresponding comparison module outputs a high-level signal to the channel locking unit. At this time, the channel locking unit will clamp the comparison module output corresponding to the other battery pack to a low-level signal, so that the power channel of the other battery pack is cut off. If another battery pack is connected at this time, the other battery pack cannot provide power to the UPS. The comparator can only turn off the channel output of the current battery pack after the current battery pack is discharged. The comparator output signal corresponding to the current battery pack is low and the clamp on the channel of the other battery pack can be released. The same is true if the other battery pack is connected first.

[0076] When the dual battery packs are forced to power on, the comparator outputs of the two battery packs can be pulled down to a low-level signal through an external signal source; or the uninterruptible power supply inverter can detect the current, voltage or power, and then pull the comparator outputs of the two battery packs to a low-level signal in case of insufficient current, voltage or power. At this time, the channel locking unit will release the clamp on the outputs of the two comparators, making the channels of the two battery packs independent of each other. As long as the comparator unit recognizes that the battery pack voltage is high enough, the battery pack can be turned on to supply power to the load.

[0077] The solution provided by the embodiment of the utility model is suitable for low-voltage DC power supply occasions, especially in the electrical system of battery pack emergency power supply. The technical solution provided by the embodiment of the utility model can provide a redundant design solution for battery pack power supply in the power supply system, in which one battery pack can be automatically and seamlessly switched to another battery pack after the discharge is completed, and when one battery pack is discharged, it can be manually replaced with another fully charged new battery pack without stopping the machine, which does not affect the use of electrical equipment and does not require stopping and waiting.

[0078] As an optional implementation, continue as Figure 1 As shown, it also includes:

[0079] A power module is electrically connected to the two battery packs and is used to convert the voltage of at least one of the two battery packs into a first predetermined voltage and then provide power to the two comparison modules, the two drivers and the reference voltage module.

[0080] In a specific embodiment, the first predetermined voltage may be a 5V DC voltage, so that the power supply module can provide a 5V DC operating voltage for the comparison module, the two drivers and the reference voltage module.

[0081] As an optional implementation, Figure 2 As shown, the comparison module includes:

[0082] A first resistor R1, wherein a first end of the first resistor R1 is electrically connected to an output electrode of a corresponding battery pack;

[0083] a second resistor R2, wherein a first end of the second resistor R2 is electrically connected to a second end of the first resistor R1, and a second end of the second resistor R2 is grounded;

[0084] A first capacitor C1, wherein a first end of the first capacitor C1 is electrically connected to a second end of the first resistor R1, and a second end of the first capacitor C1 is grounded;

[0085] A first comparator U1, wherein a first input terminal of the first comparator U1 is electrically connected to a first terminal of the first capacitor C1, and a second input terminal of the first comparator U1 is electrically connected to an output terminal of the reference voltage module;

[0086] A second capacitor C2, wherein a first end of the second capacitor C2 is electrically connected to the second input end of the first comparator U1, and a second end of the second capacitor C2 is grounded;

[0087] A third resistor R3 , wherein a first end of the third resistor R3 is electrically connected to a power pin of the first comparator U1 , and a second end of the third resistor R3 is electrically connected to an output end of the first comparator U1 .

[0088] In some embodiments, the positive end of the first comparator U1 collects the low-voltage bus voltage (that is, the battery pack voltage) and compares it with the 2.5V reference voltage obtained by the reverse section. If the bus sampling voltage is greater than the reference voltage, it means that the voltage and power of the battery pack are sufficient, and the first comparator outputs a high-level signal, otherwise it outputs a low-level signal. U1 can be, for example, an LM358 dual-channel chip, in which one first comparator U1, a resistor and a capacitor form the first comparator of a battery pack channel, which is responsible for monitoring its bus voltage; another first comparator U1, a resistor and a capacitor form the first comparator of another battery pack channel, which is responsible for monitoring its bus voltage; if the bus voltage is higher than the reference voltage, the first comparator U1 outputs a 5V high level, and if the bus voltage is lower than the reference voltage, the first comparator outputs a 0V low level. In each comparison module, R1 and R2 are sampling resistors that collect bus voltage. C1 and C2 are filter capacitors at the in-phase and reverse ends, which are responsible for eliminating signal noise and making the circuit more stable. R3 is a pull-up resistor at the output end of the first comparator.

[0089] As an optional implementation, Figure 3 As shown, the driver comprises:

[0090] A driving chip U2, wherein a negative input pin of a control end of the driving chip U2 is electrically connected to an output end of the comparison module, and a voltage source pin of a controlled end of the driving chip U2 is electrically connected to a corresponding output electrode of a battery pack;

[0091] a fourth resistor R4, wherein a first end of the fourth resistor R4 is electrically connected to the power module, and a second end of the fourth resistor R4 is electrically connected to a control positive input pin of the driver chip U2;

[0092] a fifth resistor R5, wherein a first end of the fifth resistor R5 is electrically connected to a controlled end output pin of the driving chip U2;

[0093] A first diode D1 , wherein a first end of the first diode D1 is electrically connected to a first end of the fifth resistor R5 , and a second end of the first diode D1 is electrically connected to a second end of the fifth resistor R5 .

[0094] In some embodiments, the signal output by the first comparator is given to the negative input of the control terminal of the driver chip U2. If the control terminal receives a high level, the output terminal of the driver chip U2 will output an opposite low voltage signal, so that the switch module is turned on; if the control terminal receives a low level, the output terminal of the driver chip U2 will output an opposite high voltage signal, so that the switch module is turned off; the on and off of the switch module can control the power supply and power off of the battery pack. In this circuit, the driver chip U2 can be, for example, a professional MOS driver chip TLP155E with isolation and driving functions. The circuit using this chip can be simplified in design. When AK of pin 1 (i.e. the positive input pin of the control end) and pin 2 (i.e. the negative input pin of the control end) of the driver chip U2 is turned on, pin 4 (i.e. the output pin of the controlled end) outputs a high level, wherein the voltage value depends on the voltage of the battery pack, and the driving current can support 0.6A; when AK of pin 1 (i.e. the positive input pin of the control end) and pin 2 (i.e. the negative input pin of the control end) is cut off, pin 4 (i.e. the output pin of the controlled end) outputs a low level of 0V, wherein the driving current can support -0.6A; wherein R4 acts as a current limiter when AK is turned on, the D1 diode acts to accelerate the closing of the switch module, and R5 is the driving resistor of the switch module.

[0095] As an optional implementation, Figure 4 As shown, the power module includes:

[0096] a second diode D2, wherein a first end of the second diode D2 is electrically connected to an output electrode of one of the battery groups;

[0097] a third capacitor C3, wherein a first end of the third capacitor C3 is electrically connected to the second end of the second diode D2, and a second end of the third capacitor C3 is grounded;

[0098] a third diode D3, wherein a first end of the third diode D3 is electrically connected to an output electrode of another battery pack, and a second end of the third diode D3 is electrically connected to a second end of the second diode D2;

[0099] a fourth capacitor C4, wherein a first end of the fourth capacitor C4 is electrically connected to the second end of the third diode D3, and a second end of the fourth capacitor C4 is grounded;

[0100] A buck chip U3, wherein the input end of the buck chip U3 is electrically connected to the second end of the third diode D3, and the output end of the buck chip U3 is used to output a target voltage;

[0101] A fifth capacitor C5, wherein a first end of the fifth capacitor C5 is electrically connected to the output end of the buck chip U3, and a second end of the fifth capacitor C5 is grounded;

[0102] a sixth capacitor C6, wherein a first end of the sixth capacitor C6 is electrically connected to the first end of the fifth capacitor C5, and a second end of the sixth capacitor C6 is grounded;

[0103] A seventh capacitor C7, wherein a first end of the seventh capacitor C7 is electrically connected to a first end of the sixth capacitor C6, and a second end of the seventh capacitor C7 is grounded; and a first end of the seventh capacitor C7 is electrically connected to two comparison modules, two drivers and a reference voltage module.

[0104] As an optional implementation, the power module belongs to a linear step-down circuit, and D2 and D3 in the circuit are diodes, which play a unidirectional conduction role to prevent the current of the two battery packs from flowing back to each other. The battery pack current is filtered by C3 and C4 and then fed to the step-down chip, where the step-down chip can be, for example, a 7805 chip, which outputs a stable 5V voltage, which is fed to the first comparator and the reference voltage module after passing through capacitors C5, C6, and C7.

[0105] As an optional implementation, Figure 5 As shown, the switch module includes:

[0106] A first controllable switch Q1, wherein a control end of the first controllable switch Q1 is electrically connected to an output end of the driver, and an output end of the first controllable switch Q1 is electrically connected to the filter module;

[0107] an eighth capacitor C8, wherein a first end of the eighth capacitor C8 is electrically connected to the control end of the first controllable switch Q1, and a second end of the eighth capacitor C8 is electrically connected to the input end of the first controllable switch Q1;

[0108] a sixth resistor R6, wherein a first end of the sixth resistor R6 is electrically connected to a first end of the eighth capacitor C8, and a second end of the sixth resistor R6 is electrically connected to a second end of the eighth capacitor C8;

[0109] A fourth diode D4, a first end of the fourth diode D4 is electrically connected to the input end of the first controllable switch Q1, and a second end of the fourth diode D4 is electrically connected to the output electrode of the corresponding battery pack.

[0110] In some embodiments, the first controllable switch Q1 can be a switch device such as a PMOS tube, a relay, a triode or a thyristor, and its function is to control the switch for the battery pack to supply power to the outside. D4 prevents the current of the two battery packs from flowing back to each other. R6 and C8 are RC soft start circuits of the controllable switch.

[0111] As an optional implementation, Figure 6 As shown, the channel locking module includes locking branches corresponding to two comparison modules respectively, wherein the locking branches include:

[0112] A second controllable switch Q2, wherein an input terminal of the second controllable switch Q2 is electrically connected to an output terminal of one of the comparison modules, and an output terminal of the second controllable switch Q2 is grounded;

[0113] a seventh resistor R7, wherein a first end of the seventh resistor R7 is electrically connected to the control end of the second controllable switch Q2, and a second end of the seventh resistor R7 is electrically connected to the output end of the second controllable switch Q2;

[0114] a third controllable switch Q3, wherein an input end of the third controllable switch Q3 is electrically connected to a control end of the second controllable switch Q2, and an output end of the third controllable switch Q3 is grounded;

[0115] an eighth resistor R8, wherein a first end of the eighth resistor R8 is electrically connected to the control end of the second controllable switch Q2, and a second end of the eighth resistor R8 is electrically connected to the control end of the third controllable switch Q3;

[0116] a ninth resistor R9, wherein a first end of the ninth resistor R9 is electrically connected to a first end of the eighth resistor R8, and a second end of the ninth resistor R9 is electrically connected to an output end of another comparison module;

[0117] A tenth resistor R10, wherein a first end of the tenth resistor R10 is electrically connected to the control end of the third controllable switch Q3, and a second end of the tenth resistor R10 is electrically connected to a control signal source for simultaneously starting two battery packs to supply power.

[0118] In some embodiments, the channel locking module can play a role in battery pack preemption. Of the two battery packs, the one that is connected to the low-voltage DC bus first can be used as the battery pack with priority discharge, and the battery pack connected after locking is the backup battery pack; unless the interlocking function is forcibly released. When the unlocking is not started, if the first comparator corresponding to one of the battery packs outputs a high level and the corresponding second controllable switch Q2 is turned on, the output end of the first comparator corresponding to the other battery pack is forced to be grounded, thereby locking the output end of the first comparator corresponding to the other battery pack to a low level, thereby turning off the output of the other battery pack. When the output signal of the first comparator corresponding to the current battery pack becomes a low level (the battery pack is low in power or is removed), the corresponding Q2 is cut off, releasing the lock on the output end of the first comparator corresponding to the other battery pack, and then the other battery pack can take over the current battery pack to supply power to the outside. If the user needs two battery packs to supply power at the same time, the external control signal source can be set to output a low-level signal; or the uninterruptible power supply inverter can determine that a single battery pack cannot provide enough power by detecting current, voltage or power, and can also output a low-level signal as a control signal source; the low-level signal output by the control signal source can turn off the interlocking function so that the two battery packs can supply power to the load at the same time. This is because the third controllable switch Q3 is turned on at this time, pulling down the voltage of the Q2 control terminal to 0V, forcibly turning off the turned-on Q2, so that the two control branches will not constrain each other, and as long as the battery pack has enough power, it can output power to the outside. Among them, R9 is the current limiting and voltage reducing resistor of the control terminal of Q2, R7 is the pull-down resistor of the control terminal of Q2, R10 is the current limiting and voltage reducing resistor of the control terminal of Q3, and R8 is the pull-up resistor of the control terminal of Q3. The pull-up resistor R8 and the pull-down resistor R9 are important components to ensure the most stable operation of the circuit.

[0119] As an optional implementation, Figure 7 As shown, the filtering module includes:

[0120] A first inductor L1, wherein a first end of the first inductor L1 is electrically connected to output ends of the two switch modules, and a second end of the first inductor L1 is electrically connected to the uninterruptible power supply inverter;

[0121] a ninth capacitor C9, wherein a first end of the ninth capacitor C9 is electrically connected to the second end of the first inductor L1, and a second end of the ninth capacitor C9 is grounded;

[0122] a tenth capacitor C10, wherein a first end of the tenth capacitor C10 is electrically connected to a first end of the ninth capacitor C9, and a second end of the tenth capacitor C10 is grounded;

[0123] An eleventh capacitor C11, a first end of the eleventh capacitor C11 is electrically connected to the first end of the tenth capacitor C10, and a second end of the eleventh capacitor C11 is grounded.

[0124] In some embodiments, the filter module is located on the output bus, and the two currents are combined and filtered before being output to the subsequent electrical equipment. In the circuit, L1 is an inductor, and the magnetic inductance is not too large. It is mainly used to block the high-frequency burrs and spikes generated by the switch module during the switching process. Capacitors C9, C10, and C11 are responsible for absorbing the spikes.

[0125] As an optional implementation, Figure 8 As shown, the reference voltage module includes:

[0126] an eleventh resistor R11, a first end of the eleventh resistor R11 being electrically connected to the power module;

[0127] a twelfth resistor R12, wherein a first end of the twelfth resistor R12 is electrically connected to a second end of the eleventh resistor R11;

[0128] a thirteenth resistor R13, a first end of the thirteenth resistor R13 is electrically connected to the second end of the twelfth resistor R12, and a second end of the thirteenth resistor R13 is grounded;

[0129] a twelfth capacitor C12, a first end of the twelfth capacitor C12 is electrically connected to the first end of the thirteenth resistor R13, and a second end of the twelfth capacitor C12 is grounded;

[0130] A voltage regulator U4, wherein a reference pin of the voltage regulator U4 is electrically connected to a first end of the twelfth capacitor C12, a cathode pin of the voltage regulator U4 is electrically connected to a first end of the twelfth resistor R12, and an anode pin of the voltage regulator U4 is grounded;

[0131] A thirteenth capacitor C13, a first end of the thirteenth capacitor C13 is electrically connected to the cathode pin of the voltage regulator tube U4, and a second end of the thirteenth capacitor C13 is grounded;

[0132] A fourteenth capacitor C14, a first end of the fourteenth capacitor C14 is electrically connected to the first end of the thirteenth capacitor C13, a second end of the fourteenth capacitor C14 is grounded, and a first end of the fourteenth capacitor C14 is used to output a reference voltage.

[0133] In some embodiments, the voltage regulator U4 can be, for example, a TL431 voltage regulator, and the voltage accuracy can be within the 1% accuracy range, which is provided to the comparator circuit for bus voltage monitoring. The power supply in the circuit comes from the 5V linear step-down circuit of the previous level, and the voltage is modulated to 2.5V after passing through the voltage regulator circuit composed of R11 and U4. R11 in the circuit plays a role in voltage reduction and current limiting, and the U4 voltage regulator sets the on-state working voltage to 2.5V in conjunction with R12 and R13. The 2.5V modulated signal is filtered by capacitors C13 and C14 and output to the reverse input terminal of the comparator.

[0134] As an optional implementation, it also includes an uninterruptible power supply inverter, the input end of the uninterruptible power supply inverter is electrically connected to the output end of the filter module, and the uninterruptible power supply inverter is also used to send a dual-channel opening or closing signal to the channel locking module.

[0135] In some embodiments, the uninterruptible power supply inverter can monitor the input current, voltage or power in real time. When one of the current, voltage or power does not meet the requirements, the uninterruptible power supply inverter will send a low-level signal to release the control branches of the two battery packs from clamping each other, so that the two battery packs can supply power to the outside at the same time; when the current, voltage or power all meet the requirements, the uninterruptible power supply inverter will send a high-level signal to clamp the control branches of the two battery packs from clamping each other, so that only one battery pack can supply power to the outside.

[0136] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A dual battery pack switching circuit, characterized in that: include: Two control branches corresponding to the two battery packs, the control branches comprising a comparison module for comparing the voltage of the corresponding battery pack with a reference voltage, a driver for generating a drive signal according to an output result of the comparison module, and a switch module for turning on and off the output of the corresponding battery pack according to the drive signal; A reference voltage module, used for providing a reference voltage to the comparison module; A channel locking module, used for controlling the power supply status of the two battery packs according to the comparison results of the comparison modules of the two control branches; The filter module is used to filter the voltage output by the two switch modules and output it to the uninterruptible power supply inverter so that the uninterruptible power supply inverter can supply power to the electrical equipment.

2. The dual battery pack switching circuit according to claim 1, characterized in that: Also includes: A power module is electrically connected to the two battery packs and is used to convert the voltage of at least one of the two battery packs into a first predetermined voltage and then provide power to the two comparison modules, the two drivers and the reference voltage module.

3. The dual battery pack switching circuit according to claim 2, characterized in that: The comparison module comprises: a first resistor, wherein a first end of the first resistor is electrically connected to an output electrode of a corresponding battery pack; a second resistor, a first end of the second resistor being electrically connected to a second end of the first resistor, and a second end of the second resistor being grounded; a first capacitor, wherein a first end of the first capacitor is electrically connected to a second end of the first resistor, and a second end of the first capacitor is grounded; A first comparator, wherein a first input terminal of the first comparator is electrically connected to a first terminal of the first capacitor, and a second input terminal of the first comparator is electrically connected to an output terminal of the reference voltage module; a second capacitor, wherein a first end of the second capacitor is electrically connected to the second input end of the first comparator, and a second end of the second capacitor is grounded; A third resistor, wherein a first end of the third resistor is electrically connected to a power supply pin of the first comparator, and a second end of the third resistor is electrically connected to an output end of the first comparator.

4. The dual battery pack switching circuit according to claim 2, characterized in that: The driver comprises: A driving chip, wherein a negative input pin of a control end of the driving chip is electrically connected to an output end of the comparison module, and a voltage source pin of a controlled end of the driving chip is electrically connected to a corresponding output electrode of the battery pack; a fourth resistor, wherein a first end of the fourth resistor is electrically connected to the power module, and a second end of the fourth resistor is electrically connected to a control positive input pin of the driving chip; a fifth resistor, a first end of the fifth resistor being electrically connected to a controlled end output pin of the driving chip; A first diode, wherein a first end of the first diode is electrically connected to a first end of the fifth resistor, and a second end of the first diode is electrically connected to a second end of the fifth resistor.

5. The dual battery pack switching circuit according to claim 2, characterized in that: The power module comprises: a second diode, wherein a first end of the second diode is electrically connected to an output electrode of one of the battery groups; a third capacitor, a first end of the third capacitor being electrically connected to the second end of the second diode, and a second end of the third capacitor being grounded; a third diode, wherein a first end of the third diode is electrically connected to an output electrode of another battery group, and a second end of the third diode is electrically connected to a second end of the second diode; a fourth capacitor, wherein a first end of the fourth capacitor is electrically connected to the second end of the third diode, and a second end of the fourth capacitor is grounded; a buck chip, wherein an input end of the buck chip is electrically connected to the second end of the third diode, and an output end of the buck chip is used to output a target voltage; a fifth capacitor, wherein a first end of the fifth capacitor is electrically connected to the output end of the step-down chip, and a second end of the fifth capacitor is grounded; a sixth capacitor, wherein a first end of the sixth capacitor is electrically connected to the first end of the fifth capacitor, and a second end of the sixth capacitor is grounded; A seventh capacitor, wherein a first end of the seventh capacitor is electrically connected to a first end of the sixth capacitor, and a second end of the seventh capacitor is grounded; and a first end of the seventh capacitor is electrically connected to two comparison modules, two drivers and a reference voltage module.

6. The dual battery pack switching circuit according to claim 1, characterized in that: The switch module comprises: a first controllable switch, wherein a control end of the first controllable switch is electrically connected to an output end of the driver, and an output end of the first controllable switch is electrically connected to the filter module; an eighth capacitor, wherein a first end of the eighth capacitor is electrically connected to the control end of the first controllable switch, and a second end of the eighth capacitor is electrically connected to the input end of the first controllable switch; a sixth resistor, wherein a first end of the sixth resistor is electrically connected to a first end of the eighth capacitor, and a second end of the sixth resistor is electrically connected to a second end of the eighth capacitor; A fourth diode, wherein a first end of the fourth diode is electrically connected to the input end of the first controllable switch, and a second end of the fourth diode is electrically connected to the output electrode of the corresponding battery pack.

7. The dual battery pack switching circuit according to claim 1, characterized in that: The channel locking module includes locking branches corresponding to the two comparison modules respectively, wherein the locking branches include: a second controllable switch, wherein an input terminal of the second controllable switch is electrically connected to an output terminal of one of the comparison modules, and an output terminal of the second controllable switch is grounded; a seventh resistor, wherein a first end of the seventh resistor is electrically connected to the control end of the second controllable switch, and a second end of the seventh resistor is electrically connected to the output end of the second controllable switch; a third controllable switch, wherein an input end of the third controllable switch is electrically connected to a control end of the second controllable switch, and an output end of the third controllable switch is grounded; an eighth resistor, a first end of the eighth resistor being electrically connected to the control end of the second controllable switch, and a second end of the eighth resistor being electrically connected to the control end of the third controllable switch; a ninth resistor, wherein a first end of the ninth resistor is electrically connected to a first end of the eighth resistor, The second end of the ninth resistor is electrically connected to the output end of another comparison module; A tenth resistor, wherein a first end of the tenth resistor is electrically connected to the control end of the third controllable switch, and a second end of the tenth resistor is electrically connected to a control signal source for simultaneously starting two battery packs to supply power.

8. The dual battery pack switching circuit according to claim 1, characterized in that: The filtering module comprises: A first inductor, wherein a first end of the first inductor is electrically connected to output ends of the two switch modules, and a second end of the first inductor is electrically connected to the uninterruptible power supply inverter; a ninth capacitor, wherein a first end of the ninth capacitor is electrically connected to the second end of the first inductor, and a second end of the ninth capacitor is grounded; a tenth capacitor, wherein a first end of the tenth capacitor is electrically connected to the first end of the ninth capacitor, and a second end of the tenth capacitor is grounded; An eleventh capacitor, wherein a first end of the eleventh capacitor is electrically connected to a first end of the tenth capacitor, and a second end of the eleventh capacitor is grounded.

9. The dual battery pack switching circuit according to claim 1, characterized in that: The reference voltage module comprises: an eleventh resistor, a first end of the eleventh resistor being electrically connected to the power module; a twelfth resistor, a first end of the twelfth resistor being electrically connected to a second end of the eleventh resistor; a thirteenth resistor, a first end of the thirteenth resistor being electrically connected to the second end of the twelfth resistor, and a second end of the thirteenth resistor being grounded; a twelfth capacitor, a first end of the twelfth capacitor being electrically connected to the first end of the thirteenth resistor, and a second end of the twelfth capacitor being grounded; A voltage regulator tube, wherein a reference pin of the voltage regulator tube is electrically connected to the first end of the twelfth capacitor, a cathode pin of the voltage regulator tube is electrically connected to the first end of the twelfth resistor, and an anode pin of the voltage regulator tube is grounded; A thirteenth capacitor, a first end of the thirteenth capacitor is electrically connected to the cathode pin of the voltage regulator tube, and a second end of the thirteenth capacitor is grounded; A fourteenth capacitor, wherein a first end of the fourteenth capacitor is electrically connected to a first end of the thirteenth capacitor, a second end of the fourteenth capacitor is grounded, and a first end of the fourteenth capacitor is used to output a reference voltage.

10. The dual battery pack switching circuit according to claim 1, characterized in that: It also includes an uninterruptible power supply inverter, the input end of the uninterruptible power supply inverter is electrically connected to the output end of the filter module, and the uninterruptible power supply inverter is also used to send a dual-channel opening or closing signal to the channel locking module.

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