Battery switching circuit and scanning device

Abstract

The application discloses a battery switching circuit and a scanning device, and belongs to the technical field of scanning. The circuit comprises an electric quantity detection module, a voltage reduction module and at least two voltage increase modules. The electric quantity detection module is connected with each battery to detect the electric quantity of the battery. The electric quantity detection module is also connected with the control end of each voltage increase module to output a first control signal to the voltage increase module connected with the battery when the electric quantity of any battery is higher than a target threshold value, and to output a second control signal to the voltage increase module connected with the battery when the electric quantity of any battery is lower than the target threshold value, so that only one of the voltage increase modules provides an input voltage to the voltage reduction module. The battery switching circuit and the scanning device provided by the application realize the switching of the power supply battery through the circuit structure mainly composed of the electric quantity detection module, the voltage reduction module and the at least two voltage increase modules. The circuit structure is simpler, the cost is lower, and the device miniaturization and cost control are more favorable.

Description

Technical Field

[0001] This application belongs to the field of scanning technology, and in particular relates to a battery switching circuit and a scanning device. Background Technology

[0002] Currently, many scanning devices (such as handheld scanners, scanners, or barcode scanners) are powered by batteries. Single-battery and dual-battery power supplies are the most common, but triple-battery and even higher power supply solutions also exist. Currently, scanning devices using at least two batteries are typically powered by a control chip that supports automatic battery switching. This is expensive, has complex circuit designs, and is not conducive to miniaturization or cost control of the scanning device. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery switching circuit and scanning device, which can simplify circuit design and reduce costs.

[0004] In a first aspect, this application provides a battery switching circuit, which includes: a power detection module, a buck module, and at least two boost modules;

[0005] The input terminal of each boost module is used to connect to a battery; the output terminal of each boost module is connected to the input terminal of the buck module; the output terminal of the buck module is used to connect to a load; each battery corresponds to one boost module.

[0006] The power detection module is connected to each of the batteries to detect the battery's power level. The power detection module is also connected to the control terminal of each of the boost modules to output a first control signal to the boost module connected to the battery when the power level of any battery is higher than a target threshold, and to output a second control signal to the boost module connected to the battery when the power level of any battery is lower than the target threshold, so that only one of the boost modules provides input voltage to the buck module. The first control signal enables the boost module; the second control signal disables the boost module.

[0007] According to the battery switching circuit of this application, the switching of the power supply battery can be realized through a circuit structure mainly composed of a power detection module, a step-down module and at least two step-up modules. The circuit structure is simpler, the cost is lower, and it is more conducive to the miniaturization and cost control of the scanning device.

[0008] According to one embodiment of this application, the boost module includes: a boost unit and a first unidirectional conduction unit;

[0009] The input terminal of the boost unit is connected to the battery; the output terminal of the boost unit is connected to the positive terminal of the first unidirectional conduction unit; the negative terminal of the first unidirectional conduction unit is connected to the input terminal of the buck module.

[0010] For any two boost modules, the difference between the output voltage of the boost unit of one boost module and the output voltage of the boost unit of the other boost module is greater than the on-state voltage of the first unidirectional conduction unit connected to the boost unit with the higher output voltage.

[0011] According to one embodiment of this application, the first unidirectional conduction unit includes a Schottky diode or a fast recovery diode.

[0012] According to one embodiment of this application, the battery switching circuit further includes: a switching module;

[0013] The first terminal of the switch module is connected to the control terminal of each of the boost modules; when the switch module is in the closed state, the switch module outputs the first control signal to each of the boost modules.

[0014] According to one embodiment of this application, each of the batteries is connected to the second end of the switching module via a second unidirectional conduction unit.

[0015] According to one embodiment of this application, the first terminal of the switch module is connected to the control terminal of the boost module through a third unidirectional conduction unit;

[0016] The power detection module is connected to the negative terminal of each of the third unidirectional conduction units.

[0017] According to one embodiment of this application, a resistor is provided between the negative terminal of the third unidirectional conduction unit and the boost module;

[0018] The power detection module is connected to the negative terminal of each of the third unidirectional conduction units via a resistor.

[0019] According to one embodiment of this application, the switching module includes a switching unit and a filtering unit.

[0020] According to one embodiment of this application, the switch module is also connected to the power detection module; when the switch module is in a closed state, the switch module outputs a third control signal to the power detection module to enable the power detection module.

[0021] Secondly, this application provides a scanning device including the battery switching circuit as described in the first aspect.

[0022] According to the scanning device of this application, by using any of the aforementioned battery switching circuits for power switching, the circuit structure is simpler, the cost is lower, and it is more conducive to the miniaturization and cost control of the scanning device.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the battery switching circuit provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the scanning device provided in the embodiments of this application.

[0027] Reference numerals: 100, battery switching circuit; 20, electronic device; 110, power detection module; 120, buck module; 130, boost module; 131, boost unit; 132, first unidirectional conduction unit; 140, switching module; 151, second unidirectional conduction unit; 152, third unidirectional conduction unit; 153, switching unit; 154, filtering unit. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0029] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] The battery switching circuit and scanning device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0031] This application provides a battery switching circuit. (See reference...) Figure 1 The battery switching circuit includes: a power detection module 110, a buck module 120, and at least two boost modules 130.

[0032] In actual operation, this battery switching circuit can be used to switch the battery that supplies power to the load, allowing one of multiple batteries to be selected to supply power to the load. Figure 1 The description uses a dual-battery powered scenario as an example, but those skilled in the art will understand... Figure 1 Based on the following embodiments of this application, scenarios with three-battery power supply and scenarios with more than one battery power supply can be understood. It should be noted that the two batteries in the above-mentioned dual-battery power supply scenario are referred to as BAT1 and BAT2, respectively.

[0033] The input terminal of each boost module 130 is used to connect to the battery; the output terminal of each boost module 130 is connected to the input terminal of the buck module 120; the output terminal of the buck module 120 is used to connect to the load; the battery corresponds one-to-one with the boost module 130.

[0034] In actual operation, the output voltage of the battery supplying power to the load is generally the operating voltage of the load. In this embodiment, in order to achieve battery power switching, a boost module 130 is used to boost the output voltage of each battery, while a buck module 120 can buck the output voltage of each boost module 130 to the operating voltage of the load, thereby ensuring the normal operation of the load.

[0035] The specific structure or type of the step-down module 120 is not limited in the embodiments of this application. For example, Figure 1 The step-down module 120 in the figure uses a step-down chip, denoted as U3, but those skilled in the art will understand that the step-down module 120 may use a step-down circuit or the like.

[0036] The power detection module 110 is connected to each battery to detect the battery's power level. The power detection module 110 is also connected to the control terminal of each boost module 130 to output a first control signal to the boost module 130 connected to the battery when the power level of any battery is higher than a target threshold, and to output a second control signal to the boost module 130 connected to the battery when the power level of any battery is lower than the target threshold, so that only one of the boost modules 130 provides input voltage to the buck module 120. The first control signal is used to enable the boost module 130, and the second control signal is used to disable the boost module 130.

[0037] In actual operation, the power detection module 110 can be connected to each battery individually to detect the battery's power level.

[0038] In some embodiments, for each battery, the power detection module 110 can be connected to the battery via a resistor, and the end of the resistor not connected to the battery can be grounded via another resistor. With this structure, the output voltage of the battery can be divided, and the power detection module 110 detects the voltage at the voltage divider, thus preventing damage to the power detection module 110 caused by excessively high battery output voltage.

[0039] For example, Figure 1 Battery BAT1 is grounded through a series resistor R6 and a resistor R7. The connection point of resistor R6 and resistor R7 is connected to the power detection module 110, so that the power detection module 110 can detect the power of battery BAT1. Battery BAT2 is grounded through a series resistor R8 and a resistor R9. The connection point of resistor R8 and resistor R9 is connected to the power detection module 110, so that the power detection module 110 can detect the power of battery BAT2.

[0040] For each battery, the power detection module 110 can output different control signals to the control terminal of the boost module 130 connected to the battery (i.e., the corresponding battery) based on whether the battery's power level is higher than the target threshold, so as to control whether the boost module 130 works, thereby turning on or off the power supply channel where the battery is located.

[0041] It should be noted that the target threshold can be set according to actual conditions, and the specific value of the target threshold is not limited in the embodiments of this application. In some embodiments, the target threshold can be set separately for each battery, or the same target threshold can be set, so that the target thresholds of any two batteries can be the same or different.

[0042] In some embodiments, when the battery charge is higher than the target threshold, the power detection module 110 can output a first control signal to the control terminal of the boost module 130 corresponding to the battery, thereby enabling the boost module 130 to provide input voltage to the buck module 120; while when the battery charge is lower than the target threshold, the power detection module 110 can output a second control signal to the control terminal of the boost module 130 corresponding to the battery, thereby disabling the boost module 130, and the boost module 130 will not provide input voltage to the buck module 120.

[0043] In some embodiments, the first control signal and the second control signal can be control signals with different levels. For example, the first control signal and the second control signal can be high level and low level, or low level and high level, respectively.

[0044] It should be noted that even if all boost modules 130 are enabled, there is a repulsion relationship between them, and only one can actually provide input voltage to the buck module 120. In some embodiments, a selection circuit can be used to select one of the enabled boost modules 130 to provide input voltage to the buck module 120. In some embodiments, the selection circuit can be located between the output terminal of each boost module 130 and the input terminal of the buck module 120.

[0045] In some embodiments, the boost module 130 with the highest or lowest output voltage among the enabled boost modules 130 may provide the input voltage to the buck module 120. It is understood that the output voltage of the disabled boost module 130 can be considered as 0, and therefore the boost module 130 with the highest output voltage among the enabled boost modules 130 is also the one with the highest output voltage among all boost modules 130.

[0046] For example, the selection circuit may include a comparator that can compare the output voltages of each boost module 130, thereby enabling the boost module 130 with the highest output voltage to provide an input voltage to the buck module 120.

[0047] In some embodiments, the aforementioned repulsion relationship can also be achieved through the internal structure of each boost module 130. The specific internal structure used is not limited in this application.

[0048] Understandably, through the above mechanism, it is possible to switch to one of the batteries with a charge level above the target threshold after the charge of the currently powered battery is depleted to below the target threshold, thus switching the battery power supply.

[0049] It should be noted that, Figure 1 The power detection module 110 is integrated with the load. The system-on-a-chip (SOC) acts as the load, and the power detection module 110 can be integrated into the SOC. However, those skilled in the art will understand that the power detection module 110 can be separately configured from the load. When the power detection module 110 is separately configured from the load, the power supply method for the power detection module 110 is not limited.

[0050] According to the battery switching circuit of the present application embodiment, the switching of the power supply battery can be realized through a circuit structure mainly composed of a power detection module, a step-down module and at least two step-up modules. The circuit structure is simpler, the cost is lower, and it is more conducive to the miniaturization and cost control of the scanning device.

[0051] In some embodiments, the boost module 130 includes a boost unit 131 and a first unidirectional conduction unit 132.

[0052] In actual implementation, each boost module 130 may include a boost unit 131 and a first unidirectional conduction unit 132. The boost unit 131 can boost the output voltage of the battery, while the first unidirectional conduction unit 132 has unidirectional conduction characteristics.

[0053] The input terminal of the boost unit 131 is connected to the battery; the output terminal of the boost unit 131 is connected to the positive terminal of the first unidirectional conduction unit 132; and the negative terminal of the first unidirectional conduction unit 132 is connected to the input terminal of the buck module 120.

[0054] In actual implementation, for each boost module 130, the input and output terminals of the boost unit 131 in the boost module 130 are respectively connected to the battery connected to the boost module 130 and the positive terminal of the first unidirectional conduction unit 132 in the boost module 130; the negative terminal of the first unidirectional conduction unit 132 can be connected to the input terminal of the buck module 120. It can be understood that the input terminal of the boost unit 131 in the boost module 130 can serve as the input terminal of the boost module 130, or be connected to the input terminal of the boost module 130; the negative terminal of the first unidirectional conduction unit 132 in the boost module 130 can serve as the output terminal of the boost module 130, or be connected to the output terminal of the boost module 130.

[0055] The specific structure or type of the boost unit 131 is not limited in the embodiments of this application. For example, the boost module 130 connected to batteries BAT1 and BAT2 may include boost units 131 that are both boost chips, referred to as U1 and U2 respectively. However, those skilled in the art will understand that the boost unit 131 may use a boost circuit or the like.

[0056] For any two boost modules 130, the difference between the output voltage of the boost unit 131 of one boost module 130 and the output voltage of the boost unit 131 of the other boost module 130 is greater than the conduction voltage of the first unidirectional conduction unit 132 connected to the boost unit with the higher output voltage.

[0057] In actual execution, when enabled, the output voltage of each boost unit 131 is different, that is, the output voltage of any two boost units 131 is different; and for any two boost units 131, the difference between their output voltages is greater than the conduction voltage of the first unidirectional conduction unit 132 in the boost module 130 where the one with the higher output voltage is located.

[0058] It is understandable that, through the above structure, the output voltage of each boost unit 131 can form a gradient. For each enabled boost module 130, when the first unidirectional conducting unit 132 connected to the boost unit 131 with the highest output voltage is turned on, the output voltage of the boost unit 131 in any other boost module 130 is not higher than the sum of the negative voltage and the conduction voltage of the first unidirectional conducting unit 132 in that boost module 130. Therefore, the first unidirectional conducting unit 132 in that boost module 130 is turned off, and only the boost module 130 containing the boost unit 131 with the highest output voltage provides input voltage to the buck module 120, thereby achieving the aforementioned repulsion relationship.

[0059] According to the battery switching circuit of the present application embodiment, by setting a first unidirectional conduction unit in each boost module and by selecting the output voltage of each boost unit to meet a specific relationship, there is no need to set up an additional selection circuit or comparator, etc. The circuit structure is simpler, the cost is lower, and it is more conducive to the miniaturization and cost control of the scanning device.

[0060] In some embodiments, the first unidirectional conduction unit 132 includes a Schottky diode or a fast recovery diode.

[0061] In actual implementation, each first unidirectional conduction unit 132 can be a Schottky diode or a fast recovery diode, etc. Both Schottky diodes and fast recovery diodes have the characteristic of short reverse recovery time.

[0062] According to the battery switching circuit of the present application embodiment, by employing a Schottky diode or a fast recovery diode, the first unidirectional conduction unit has a shorter reverse recovery time, which enables faster switching of battery power supply.

[0063] In some embodiments, the battery switching circuit further includes: a switch module 140; a first terminal of the switch module 140 is connected to the control terminal of each boost module 130; when the switch module 140 is in a closed state, the switch module 140 outputs a first control signal to each boost module 130.

[0064] In actual operation, the switch module 140 can be used to power on the entire machine. The first terminal of the switch module 140 is connected to the control terminal of each boost module 130, so that when in the closed state, a first control signal can be output to each boost module 130 to enable each boost module 130.

[0065] According to the battery switching circuit of this application embodiment, by enabling each boost module when the whole machine is powered on by the switching module, it is possible to select a battery for power supply in the initial state.

[0066] In some embodiments, each battery is connected to the switch module 140 via a second unidirectional conduction unit 151.

[0067] In actual implementation, the battery switching circuit may also include at least two second unidirectional conduction units 151. Each second unidirectional conduction unit 151 corresponds to a battery.

[0068] For each battery, the battery can be connected to the positive terminal of the second unidirectional conduction unit 151, and the negative terminal of the second unidirectional conduction unit 151 is connected to the second terminal of the switch module 140, so that the battery can output a first control signal when the switch module 140 is closed.

[0069] According to the battery switching circuit of this application embodiment, the battery is connected to the switching module through the second unidirectional conduction unit. When the switching module is closed, a first control signal is output to each boost module to enable each boost module, and the second unidirectional conduction unit will not conduct in reverse, thereby protecting the battery.

[0070] In some embodiments, the first terminal of the switch module 140 is connected to the control terminal of the boost module 130 through the third unidirectional conduction unit 152; the power detection module 110 is connected to the negative terminal of each third unidirectional conduction unit 152.

[0071] In actual implementation, the battery switching circuit may also include at least two third unidirectional conduction units 152. Each third unidirectional conduction unit 152 corresponds one-to-one with the battery and the boost module 130.

[0072] For each third unidirectional conduction unit 152, the positive terminal of the third unidirectional conduction unit 152 can be connected to the first terminal of the switch module 140, and the negative terminal of the third unidirectional conduction unit 152 can be connected to the control terminal of the corresponding boost module 130. Furthermore, the negative terminal of the third unidirectional conduction unit 152 can also be connected to an output terminal of the power detection module 110 connected to the control terminal of the boost module 130. Based on the above connections, when the switch module 140 is closed, the first control signal from the switch module 140 can be transmitted to each boost module 130, enabling each boost module 130. When the switch module 140 is open, whether each boost module 130 is enabled is controlled by the power detection module 110; neither the first nor the second control signal output by the power detection module 110 will be transmitted in reverse to the switch module 140. Based on this mechanism, self-locking of each boost module 130 can be achieved after the entire machine is powered on.

[0073] According to the battery switching circuit of this application embodiment, the first terminal of the switching module is connected to the control terminal of the boost module through the third unidirectional conduction unit, and the power detection module is connected to the negative terminal of each third unidirectional conduction unit, which can realize the self-locking of each boost module after the whole machine is turned on.

[0074] In some embodiments, a resistor is provided between the negative terminal of the third unidirectional conduction unit 152 and the boost module 130; the power detection module 110 is connected to the negative terminal of each third unidirectional conduction unit 152 through the resistor.

[0075] In actual implementation, for each third unidirectional conduction unit 152, the negative terminal of the third unidirectional conduction unit 152 can be connected to the control terminal of the corresponding boost module 130 through a resistor, and also connected to the power detection module 110 through a resistor. The function of the above resistors is to limit current.

[0076] For example, the negative terminal of the third unidirectional conduction unit 152, which is connected to the boost module 130 corresponding to battery BAT1, is connected to the boost module 130 through resistor R2, and the negative terminal of the third unidirectional conduction unit 152 is also connected to the power detection module 110 through resistor R3; the negative terminal of the third unidirectional conduction unit 152, which is connected to the boost module 130 corresponding to battery BAT2, is connected to the boost module 130 through resistor R4, and the negative terminal of the third unidirectional conduction unit 152 is also connected to the power detection module 110 through resistor R5.

[0077] According to the battery switching circuit of this application embodiment, a current-limiting resistor is set between the negative terminal of the third unidirectional conduction unit and the boost module, and a current-limiting resistor is also set between the negative terminal of the third unidirectional conduction unit 152 and the power detection module, which can protect the circuit and prevent the circuit from being damaged due to excessive current.

[0078] In some embodiments, the switching module 140 includes a switching unit 153 and a filtering unit 154.

[0079] In actual implementation, the switching module 140 may include a switching unit 153 and a filtering unit 154. The switching unit 153 is connected to the filtering unit 154.

[0080] In some embodiments, one end of the switching unit 153 may be connected to the negative terminal of each of the second unidirectional conduction units 151, and the other end may be connected to the filtering unit 154.

[0081] Switching unit 153 can employ any type of switching device, such as Figure 1 The button K1, etc., are shown. The specific type of switching device is not limited in the embodiments of this application.

[0082] The filter unit 154 can employ any type of filter circuit; the specific type of filter circuit is not limited in this embodiment. For example, Figure 1 The intermediate filter unit 154 adopts an RC filter circuit, which consists of a resistor R1 and a capacitor C1. R1 is connected to the output terminal of the switch unit 153 and the switch module 140, and the capacitor C1 is connected between the resistor R1 and ground.

[0083] According to the battery switching circuit of the present application embodiment, by employing a switching unit and a filtering unit, the first control signal output by the switching module can be made more stable, thereby protecting the circuit.

[0084] In some embodiments, the switch module 140 is also connected to the power detection module 110; when the switch module 140 is in the closed state, the switch module 140 outputs a third control signal to the power detection module 110 to enable the power detection module 110.

[0085] In actual operation, the switch module 140 is also connected to the power detection module 110, so that when the whole machine is powered on, the switch module 140 outputs a third control signal to the power detection module 110. The third control signal is used to enable the power detection module 110.

[0086] According to the battery switching circuit of this application embodiment, the battery switching is connected to the power detection module through the switch module. After the whole machine is powered on, the power detection module is activated, realizing the switching of the battery based on the power detection module after the initial state. The circuit structure is simpler, the cost is lower, and it is more conducive to the miniaturization and cost control of the scanning device.

[0087] To facilitate understanding of the above embodiments of this application, the following is a summary... Figure 1 The working process of the battery switching circuit shown is described.

[0088] Each of the two batteries, BAT1 and BAT2, is equipped with independent boost chips U1 and U2. Their output voltages are boosted to VCC1 (the output voltage of boost unit 131 connected to BAT1) and VCC2 (the output voltage of boost unit 131 connected to BAT2), respectively. Furthermore, VCC1 is at least 0.7V higher than VCC2 (taking the conduction voltage of each first unidirectional conduction unit 132 as an example, where the conduction voltage is 0.7V). VCC1 and VCC2 are then combined into VDD after passing through Schottky diodes D1 and D2 (each serving as a first unidirectional conduction unit 132). Because VCC1 has a higher voltage, it preferentially consumes the power of battery BAT1 during power supply.

[0089] The device is powered on by pressing button K1 (K1 closed). The specific switching between the two batteries BAT1 and BAT2 is as follows: When button K1 is pressed, KEY_IN is pulled high (i.e., a high-level third control signal), and BAT_EN1 (the enable signal for battery BAT1, which is the first control signal when enabled and the second control signal when disabled) and BAT_EN2 (the enable signal for battery BAT2, which is the first control signal when enabled and the second control signal when disabled) are also pulled high. This enables chips U1 and U2, outputting VCC1 and VCC2, and subsequently outputting VDD. VDD supplies power to the SOC via step-down chip U3. After the SOC starts up, it pulls POW_EN1 and POW_EN2 high, enabling and latching both chips U1 and U2. BAT_EN1 and BAT_EN2 are then pulled high by POW_EN1 and POW_EN2 respectively. Even after button K1 is released (i.e., disconnected), the enable of chips U1 and U2 remains effective. After the device is powered on, the SOC automatically detects the power levels of the two batteries. When the power level of battery BAT1 falls below the set target threshold, it pulls the POW_EN1 signal low, which in turn pulls BAT_EN1 low, shutting off power to battery BAT2.

[0090] It is understandable that the above structure is not only applicable to dual-battery power supply switching, but can also be implemented with three or more batteries. Using the above structure, for multiple batteries, combined with multiple Schottky diodes (to form the first unidirectional conduction unit 232), switch enable control and power detection module 110, power supply switching of multiple batteries can be completed.

[0091] This application also provides a scanning device 20. For example... Figure 2 As shown, the scanning device 20 includes the battery switching circuit 100 of the above embodiment and can achieve the same effect. To avoid repetition, it will not be described again here.

[0092] In some embodiments, the specific type of scanning device 20 is not limited in this application. For example, the scanning device 20 can be any type of scanning device such as a handheld scanner, a scanner, or a barcode scanner.

[0093] It is understood that the scanning device 20 may include at least two batteries. The specific connection relationship between each battery and the battery switching circuit 100 can be found in the foregoing embodiments, and will not be repeated here.

[0094] The scanning device according to the embodiments of this application uses any of the aforementioned battery switching circuits for power switching, resulting in a simpler circuit structure, lower cost, and greater advantages for miniaturization and cost control of the scanning device.

[0095] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0097] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery switching circuit, characterized in that, include: A power detection module, a buck module, and at least two boost modules; The input terminal of each boost module is used to connect to a battery; the output terminal of each boost module is connected to the input terminal of the buck module; the output terminal of the buck module is used to connect to a load; each battery corresponds to one boost module. The power detection module is connected to each of the batteries to detect the battery's power level. The power detection module is also connected to the control terminal of each of the boost modules to output a first control signal to the boost module connected to the battery when the power level of any battery is higher than a target threshold, and to output a second control signal to the boost module connected to the battery when the power level of any battery is lower than the target threshold, so that only one of the boost modules provides input voltage to the buck module. The first control signal enables the boost module; the second control signal disables the boost module.

2. The battery switching circuit according to claim 1, characterized in that, The boost module includes: a boost unit and a first unidirectional conduction unit; The input terminal of the boost unit is connected to the battery; the output terminal of the boost unit is connected to the positive terminal of the first unidirectional conduction unit; the negative terminal of the first unidirectional conduction unit is connected to the input terminal of the buck module. For any two boost modules, the difference between the output voltage of the boost unit of one boost module and the output voltage of the boost unit of the other boost module is greater than the on-state voltage of the first unidirectional conduction unit connected to the boost unit with the higher output voltage.

3. The battery switching circuit according to claim 2, characterized in that, The first unidirectional conduction unit includes a Schottky diode or a fast recovery diode.

4. The battery switching circuit according to any one of claims 1 to 3, characterized in that, Also includes: Switch module; The first terminal of the switch module is connected to the control terminal of each of the boost modules; When the switch module is in the closed state, the switch module outputs the first control signal to each of the boost modules.

5. The battery switching circuit according to claim 4, characterized in that, Each of the batteries is connected to the second end of the switch module via a second unidirectional conduction unit.

6. The battery switching circuit according to claim 4, characterized in that, The first end of the switch module is connected to the control end of the boost module through a third unidirectional conduction unit. The power detection module is connected to the negative terminal of each of the third unidirectional conduction units.

7. The battery switching circuit according to claim 6, characterized in that, A resistor is provided between the negative terminal of the third unidirectional conduction unit and the boost module; The power detection module is connected to the negative terminal of each of the third unidirectional conduction units via a resistor.

8. The battery switching circuit according to claim 4, characterized in that, The switching module includes a switching unit and a filtering unit.

9. The battery switching circuit according to claim 4, characterized in that, The switch module is also connected to the power detection module; when the switch module is in the closed state, the switch module outputs a third control signal to the power detection module to enable the power detection module.

10. A scanning device, characterized in that, Includes the battery switching circuit as described in any one of claims 1-9.

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