Power management device and electronic equipment

Abstract

The utility model discloses a power management device and electronic equipment, and belongs to the technical field of power electronics. The device comprises an external power supply circuit which is connected with an external power supply and is used for converting the voltage of the external power supply to output a first voltage; a battery; the charging management circuit is connected with the external power supply circuit and the battery and is used for charging the battery; one end of the power supply management circuit is connected with the battery, and the power supply management circuit is used for converting the output voltage of the battery to output second voltage; the input end of the power supply selection circuit is connected with the external power supply circuit and the power supply management circuit, and the output end of the power supply selection circuit is connected with the weighing instrument and used for selecting output voltage to supply power to the weighing instrument; the first end of the microprocessor is connected with an external power supply circuit, the second end of the microprocessor is connected with the power supply management circuit, and the microprocessor is used for detecting the first voltage, outputting an enable signal and controlling the power supply management circuit to be conducted. The microprocessor is adopted to control power supply of the battery, and the problem of power loss of the battery is solved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to power management devices and electronic equipment. Background Art

[0002] In the field of weighing technology, electronic weighing instruments are responsible for collecting signals from weighing sensors and performing data processing and display. Depending on the application scenario, electronic weighing instruments choose different power supply methods, which are generally divided into external AC power supply, external DC power supply, and internal battery power supply. For vehicle-mounted weighing, the vehicle-mounted weighing instrument needs to complete the real-time monitoring of the vehicle cargo weight and the real-time positioning of the vehicle location information, and upload it to the server via 4G wireless communication. It is mainly powered by the vehicle's DC power supply. If the external power supply is accidentally disconnected, the weight data and location information will be lost, and the vehicle will be out of contact. Therefore, vehicle-mounted weighing instruments generally have external power supply and internal battery power supply.

[0003] However, the current power supply method of the vehicle weighing instrument has the following defects: when the external power supply is not connected to the vehicle weighing instrument, even if the vehicle weighing instrument is not in working state, the internal battery will still automatically power the vehicle weighing instrument, causing power loss and other problems. Utility Model Content

[0004] The main purpose of the present application is to provide a power management device and an electronic device, aiming to solve the technical problem of battery power loss when the weighing instrument is not in working state.

[0005] To achieve the above object, the present application provides a power management device for supplying power to a weighing instrument, the power management device comprising:

[0006] an external power supply circuit, wherein an input end of the external power supply circuit is connected to an external power supply, and the external power supply circuit is used to convert a voltage of the external power supply to output a first voltage;

[0007] Battery;

[0008] a charging management circuit, one end of which is connected to the output end of the external power supply circuit, and the other end of which is connected to the battery, and the charging management circuit is used to charge the battery through the first voltage;

[0009] a power supply management circuit, one end of which is connected to the battery, and the power supply management circuit is used to convert the output voltage of the battery to output a second voltage;

[0010] A power selection circuit, wherein the input end of the power selection circuit is respectively connected to the output end of the external power supply circuit and the output end of the power supply management circuit, the output end of the power selection circuit is connected to the weighing instrument, and the power selection circuit is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument;

[0011] A microprocessor, wherein a first end of the microprocessor is connected to a detection end of the external power supply circuit, and a second end of the microprocessor is connected to a controlled end of the power supply management circuit. The microprocessor is used to detect the first voltage and output an enable signal according to the first voltage to control the power supply management circuit to be turned on.

[0012] Optionally, the third terminal of the microprocessor is connected to the detection terminal of the power supply management circuit, and the microprocessor is also used to detect the power level of the battery through the power supply management circuit and send an alarm signal when the power level is lower than a preset power level.

[0013] Optionally, when the weighing instrument needs to be started, if the external power supply circuit outputs the first voltage, the microprocessor outputs the enable signal to turn on the power supply management circuit and output the second voltage, and the power supply selection circuit selects the first voltage as the output voltage;

[0014] If the first voltage is cut off after being output, the power selection circuit selects the second voltage as the output voltage.

[0015] Optionally, when the weighing instrument does not need to be started, the external power supply circuit is cut off from the external power supply, and the power supply management circuit is cut off.

[0016] Optionally, the external power supply circuit includes:

[0017] A first conversion chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first inductor;

[0018] The input end of the first conversion chip serves as the input end of the external power supply circuit, and is respectively connected to the external power supply, one end of the first capacitor, and one end of the second capacitor; the ground end of the first conversion chip is respectively connected to the ground, the other end of the first capacitor, the other end of the second capacitor, the positive electrode of the first diode, the other end of the third capacitor, the other end of the fifth capacitor, and the other end of the third resistor; the output end of the first conversion chip is respectively connected to the negative electrode of the first diode and one end of the first inductor; the other end of the first inductor serves as the output end of the external power supply circuit, and is respectively connected to the input end of the power supply selection circuit, one end of the charging management circuit, one end of the third capacitor, one end of the fourth capacitor, one end of the fifth capacitor, one end of the first resistor, and one end of the second resistor; the other end of the first resistor is respectively connected to the detection end of the first conversion chip, one end of the third resistor, and the other end of the fourth capacitor; the other end of the second resistor serves as the detection end of the external power supply circuit and is respectively connected to one end of the fourth resistor and the first end of the microprocessor; the other end of the fourth resistor is grounded;

[0019] Wherein, the first conversion chip is used to convert the voltage of the external power supply into the first voltage.

[0020] Optionally, the charging management circuit includes:

[0021] A battery management chip, a fifth resistor, a sixth resistor, a light emitting diode, and a sixth capacitor;

[0022] The power supply end of the battery management chip is respectively connected to the other end of the first inductor and one end of the sixth capacitor, the other end of the sixth capacitor is grounded, the charging end of the battery management chip is respectively connected to the cathode of the light-emitting diode and one end of the fifth resistor, the other end of the fifth resistor is respectively connected to the other end of the first inductor and one end of the sixth resistor, the other end of the sixth resistor is connected to the anode of the light-emitting diode, the ground end of the battery management chip is grounded, and the output end of the battery management chip is connected to the battery;

[0023] Wherein, the battery management chip is used for protecting and controlling the battery charging process;

[0024] The light emitting diode is used to display the charging status.

[0025] Optionally, the power supply management circuit includes:

[0026] A second conversion chip, a second inductor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor, and a first switch tube;

[0027] The switch end of the second conversion chip is connected to one end of the second inductor, the other end of the second inductor is respectively connected to one end of the ninth capacitor, the input end of the second conversion chip, the battery and one end of the seventh resistor, the other end of the ninth capacitor is grounded, the other end of the seventh resistor is respectively connected to one end of the eighth resistor and the third end of the microprocessor, the other end of the eighth resistor is grounded, the enable end of the second conversion chip is respectively connected to one end of the ninth resistor and the first end of the first switch tube, the other end of the ninth resistor is grounded, the second end of the first switch tube is respectively connected to one end of the tenth resistor and one end of the eleventh resistor, the third end of the first switch tube is respectively connected to the other end of the tenth resistor and the battery, the other end of the eleventh resistor is connected to the second end of the microprocessor, the output end of the second conversion chip is respectively connected to the input end of the power selection circuit, one end of the twelfth resistor, one end of the thirteenth resistor, one end of the seventh capacitor and one end of the eighth capacitor, the feedback end of the second conversion chip is respectively connected to the other end of the twelfth resistor, the other end of the seventh capacitor and one end of the fourteenth resistor, the other end of the eighth capacitor is grounded, the other end of the thirteenth resistor is grounded, and the other end of the fourteenth resistor is grounded;

[0028] Wherein, the first switch tube is used to be turned on according to the enable signal to enable the second conversion chip;

[0029] The second conversion chip is used for converting the output voltage of the battery into the second voltage.

[0030] Optionally, the power selection circuit includes:

[0031] A fifteenth resistor, a sixteenth resistor, a second diode, a third diode, and a second switch tube;

[0032] The anode of the second diode serves as the first input terminal of the power selection circuit and is connected to the other end of the first inductor. The cathode of the second diode serves as the output terminal of the power selection circuit and is respectively connected to the cathode of the third diode and the weighing instrument. The anode of the third diode is connected to the first end of the second switch tube. The second end of the second switch tube is respectively connected to the other end of the first inductor, one end of the fifteenth resistor and one end of the sixteenth resistor. The third end of the second switch tube serves as the second input terminal of the power selection circuit and is respectively connected to the other end of the fifteenth resistor and the output terminal of the second conversion chip. The other end of the sixteenth resistor is grounded.

[0033] Optionally, when the first input terminal is connected to a first voltage and the second input terminal is connected to a second voltage, the second switch tube is turned off, and the output terminal of the power selection circuit outputs the first voltage;

[0034] When the first input terminal is not connected to the first voltage and the second input terminal is connected to the second voltage, the second switch tube is turned on, and the output terminal of the power selection circuit outputs the second voltage.

[0035] In addition, to achieve the above-mentioned purpose, the present application also provides an electronic device, which includes the power management device as described above.

[0036] The present application proposes a power management device and an electronic device, the power management device comprising: the power management device comprising: an external power supply circuit, the input end of the external power supply circuit is connected to an external power supply, the external power supply circuit is used to convert the voltage of the external power supply to output a first voltage; a battery; a charging management circuit, one end of the charging management circuit is connected to the output end of the external power supply circuit, the other end of the charging management circuit is connected to the battery, the charging management circuit is used to charge the battery with the first voltage; a power supply management circuit, one end of the power supply management circuit is connected to the battery, the power supply management circuit is used to convert the output of the battery The voltage is converted to output a second voltage; a power selection circuit, the input end of the power selection circuit is respectively connected to the output end of the external power supply circuit and the output end of the power supply management circuit, the output end of the power selection circuit is connected to the weighing instrument, and the power selection circuit is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument; a microprocessor, the first end of the microprocessor is connected to the detection end of the external power supply circuit, the second end of the microprocessor is connected to the controlled end of the power supply management circuit, the microprocessor is used to detect the first voltage, and output an enable signal according to the first voltage to control the conduction of the power supply management circuit. The power management device of the present application realizes the automatic switching between the external power supply and the battery power supply of the weighing instrument, improves the reliability of the power supply of the weighing instrument, avoids the problem of data loss and disconnection of the weighing instrument caused by accidental disconnection of the external power supply, and at the same time, the microprocessor is used to control the battery power supply, which solves the problem of battery power loss when the weighing instrument is not working. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of the structure of a power management device provided in an embodiment of the present application;

[0039] Figure 2 A supplementary connection diagram of a microprocessor in a power management device provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of the structure of an external power supply circuit in a power management device provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of the structure of a charging management circuit in a power management device provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of the structure of a power supply management circuit in a power supply management device provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of the structure of a power selection circuit in a power management device provided in an embodiment of the present application;

[0044] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0045] Description of Figure Numbers:

[0046] Label name Label name 10 External power supply circuit 20 Battery 30 Charging management circuit 40 Power management circuit 50 Power selection circuit 60 microprocessor 11 First conversion chip 31 Battery Management Chip 41 Second conversion chip C1~C9 Capacitors 1 to 9 R1~R16 The first to sixteenth resistors L1~L2 First to second inductor D1~D3 The first to third diodes led Light Emitting Diode Q1 The first switch Q2 The second switch U1 First voltage U2 Second voltage U0 Output voltage 02 Power Management Device 01 Electronic devices

[0047] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B.

[0051] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0053] In the field of weighing technology, electronic weighing instruments are responsible for collecting signals from weighing sensors and performing data processing and display. Depending on the application scenario, electronic weighing instruments choose different power supply methods, which are generally divided into external AC power supply, external DC power supply, and internal battery power supply. For vehicle-mounted weighing, the vehicle-mounted weighing instrument needs to complete the real-time monitoring of the vehicle cargo weight and the real-time positioning of the vehicle location information, and upload it to the server via 4G wireless communication. It is mainly powered by the vehicle's DC power supply. If the external power supply is accidentally disconnected, the weight data and location information will be lost, and the vehicle will be out of contact. Therefore, vehicle-mounted weighing instruments generally have external power supply and internal battery power supply.

[0054] However, the conventional internal battery power supply will automatically power the on-board weighing instrument when the on-board weighing instrument is not in working state, because the external power supply is not connected to the on-board weighing instrument at this time, causing power loss and other problems.

[0055] Based on this, the present application proposes a power management device and an electronic device, the power management device comprising: the power management device comprising: an external power supply circuit, the input end of the external power supply circuit is connected to an external power supply, the external power supply circuit is used to convert the voltage of the external power supply to output a first voltage; a battery; a charging management circuit, one end of the charging management circuit is connected to the output end of the external power supply circuit, the other end of the charging management circuit is connected to the battery, the charging management circuit is used to charge the battery through the first voltage; a power supply management circuit, one end of the power supply management circuit is connected to the battery, the power supply management circuit is used to convert the voltage of the battery The output voltage is converted to output a second voltage; a power selection circuit, the input end of the power selection circuit is respectively connected to the output end of the external power supply circuit and the output end of the power supply management circuit, the output end of the power selection circuit is connected to the weighing instrument, and the power selection circuit is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument; a microprocessor, the first end of the microprocessor is connected to the detection end of the external power supply circuit, the second end of the microprocessor is connected to the controlled end of the power supply management circuit, the microprocessor is used to detect the first voltage, and output an enable signal according to the first voltage to control the conduction of the power supply management circuit. The power management device of the present application realizes the automatic switching between the external power supply and the battery power supply of the weighing instrument, improves the reliability of the power supply of the weighing instrument, avoids the problem of data loss and disconnection of the weighing instrument caused by accidental disconnection of the external power supply, and at the same time, the microprocessor is used to control the battery power supply, which solves the problem of battery power loss when the weighing instrument is not working.

[0056] The present application embodiment provides a power management device, referring to Figure 1 , Figure 1 A schematic diagram of the structure of a power management device provided in one embodiment of the present application, wherein the power management device is used to supply power to a weighing instrument, and includes:

[0057] An external power supply circuit 10, wherein an input end of the external power supply circuit 10 is connected to an external power supply, and the external power supply circuit 10 is used to convert a voltage of the external power supply to output a first voltage;

[0058] Battery 20;

[0059] a charging management circuit 30, one end of which is connected to the output end of the external power supply circuit 10, and the other end of which is connected to the battery 20, and the charging management circuit 30 is used to charge the battery 20 through the first voltage;

[0060] a power supply management circuit 40, one end of which is connected to the battery 20, and the power supply management circuit 40 is used to convert the output voltage of the battery 20 to output a second voltage;

[0061] A power selection circuit 50, wherein the input end of the power selection circuit 50 is respectively connected to the output end of the external power supply circuit 10 and the output end of the power supply management circuit 40, and the output end of the power selection circuit 50 is connected to the weighing instrument. The power selection circuit 50 is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument;

[0062] A microprocessor 60, wherein a first end of the microprocessor 60 is connected to a detection end of the external power supply circuit 10, and a second end of the microprocessor 60 is connected to a controlled end of the power supply management circuit 40. The microprocessor 60 is used to detect the first voltage and output an enable signal according to the first voltage to control the power supply management circuit 40 to be turned on.

[0063] In this embodiment, the power management device is used to power a weighing instrument, which is a vehicle-mounted weighing instrument. The power management device has an external power supply function and an internal battery power supply function, wherein the external power supply is the main power supply mode and the battery power supply is the backup power supply mode. When the weighing instrument needs to work, the power management device converts the connected external power supply into a power supply with a voltage required by the weighing instrument, that is, a first voltage, to power the weighing instrument, wherein the external power supply can be a DC power supply of the vehicle. While powering the weighing instrument, the first voltage can also charge the battery inside the power management device to keep the battery in a fully charged state. When the external power supply fails and cannot power the weighing instrument, the power management device automatically switches to battery power supply to ensure that the weighing instrument can continue to operate, thereby improving the reliability of power supply.

[0064] The power management device of this embodiment includes an external power supply circuit 10, a battery 20, a charging management circuit 30, a power supply management circuit 40, a power supply selection circuit 50 and a microprocessor 60. The input end of the external power supply circuit 10 is connected to an external power supply, and the external power supply is converted into a first voltage. At the same time, the first voltage output by the external power supply circuit 10 also charges the battery 20. It can be understood that the battery 20 itself can store electricity. When the battery 20 is fully charged, the external power supply circuit 10 does not charge the battery 20. The charging management circuit 30 is connected between the external power supply circuit 10 and the battery 20. The function of the charging management circuit 30 is to protect the charging process of the battery, and to ensure the safety and reliability of charging by limiting the charging current. The input end of the power supply management circuit 40 is connected to the battery 20, which is used to convert the voltage output by the battery 20 to obtain the voltage required by the weighing instrument, that is, the voltage provided by the second voltage. It is easy to understand that the first voltage and the second voltage are essentially the same, both of which are voltages required for the weighing instrument to work, but the sources of the two are different. The input end of the power selection circuit 50 is connected to the first voltage and the second voltage respectively. Under normal circumstances, the first voltage and the second voltage are connected to the power selection circuit 50 at the same time. At this time, the power selection circuit 50 automatically selects the first voltage as the output voltage through circuit design to power the weighing instrument. When a fault occurs, the first voltage will be disconnected from the power selection circuit 50. At this time, the power selection circuit 50 automatically switches to the second voltage as the output voltage to power the weighing instrument. The microprocessor 60 is connected to the external power supply circuit 10 and the power supply management circuit 40 respectively. When the weighing instrument needs to work, the external power supply is connected to the external power supply circuit 10 and outputs the first voltage. After detecting the first voltage, the microprocessor 60 outputs an enable signal to the power supply management circuit 40 to turn on the power supply management circuit 40 and output the second voltage. When the weighing instrument does not need power supply, the microprocessor 60 cannot detect the first voltage and will not output an enable signal. The power supply management circuit 40 is cut off, and the power of the battery 20 will not be lost to the outside. The microprocessor 60 controls the output of the battery 20 so that the battery 20 only powers the weighing instrument when the weighing instrument needs power and the external power supply is abnormal.

[0065] The power management device of this embodiment converts the voltage of the external power supply through the external power supply circuit 10 to obtain a first voltage for powering the weighing instrument and charging the battery 20; the charging management circuit 30 is used to manage the charging process of the battery to ensure the safety and reliability of charging; the power supply management circuit 40 is used to convert the voltage output by the battery 20 into a second voltage to power the weighing instrument; the power selection circuit 50 is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument. When the first voltage is normally connected, the first voltage is selected as the output voltage. When the first voltage is accidentally disconnected, the second voltage is automatically selected as the output voltage to ensure the reliability of power supply. The microprocessor 60 is used to turn on the power supply management circuit 40 according to the first voltage. When the weighing instrument does not need to work, the microprocessor 60 controls the power supply management circuit 40 to cut off to avoid the battery 20 from supplying power to the outside and causing power loss. The power management device of this embodiment realizes the automatic switching between the external power supply and the battery power supply of the weighing instrument, improves the reliability of the power supply of the weighing instrument, avoids the problem of data loss and loss of connection of the weighing instrument caused by the accidental disconnection of the external power supply, and solves the problem of battery power loss when the weighing instrument is not working.

[0066] Reference Figure 2 In some feasible embodiments, the third end of the microprocessor 60 is connected to the detection end of the power supply management circuit 40, and the microprocessor 60 is also used to detect the power level of the battery 20 through the power supply management circuit 40, and to send an alarm signal when the power level is lower than a preset power level.

[0067] In this embodiment, the microprocessor 60 also detects the power level of the battery 20 through the power management circuit 40. When the power level of the battery 20 is lower than the preset power value, the microprocessor 60 sends an alarm signal. The specific method can be to connect a buzzer, etc. to inform relevant personnel that the power level is insufficient, so that relevant personnel can take countermeasures in time.

[0068] As an example, the preset power level may be 30%, 22%, 15%, etc. The preset power level may be set according to actual needs, and this embodiment does not impose any limitation on this.

[0069] In some feasible embodiments, when the weighing instrument needs to be started, if the external power supply circuit 10 outputs the first voltage, the microprocessor 60 outputs the enable signal to turn on the power supply management circuit 40 and output the second voltage, and the power supply selection circuit 50 selects the first voltage as the output voltage;

[0070] If the first voltage is cut off after being output, the power selection circuit 50 selects the second voltage as the output voltage.

[0071] In this embodiment, when the weighing instrument needs to be started, the external power supply is connected to the external power supply circuit 10, and the external power supply circuit 10 outputs the first voltage. The microprocessor 60 outputs an enable signal according to the first voltage, so that the power supply management circuit 40 is turned on and outputs the second voltage. At this time, the power supply selection circuit 50 uses the first voltage as the output voltage to power the weighing instrument. On this basis, if the external power supply fails and the first voltage is accidentally cut off, since the microprocessor 60 has already output the enable signal, the power supply management circuit 40 is still in the on state at this time, and the second voltage is output normally. The power supply selection circuit 50 selects the second voltage as the output voltage to power the weighing instrument. It should be added that if the external power supply has failed when the weighing instrument needs to be started, at this time, the microprocessor 60 does not detect the first voltage, and will not output the enable signal, the power supply management circuit 40 is cut off, and the weighing instrument cannot be started. Therefore, in this case, the relevant personnel can know in advance that the external power supply has failed and needs to be repaired, which further improves reliability.

[0072] In some feasible embodiments, when the weighing instrument does not need to be started, the external power supply circuit 10 is cut off from the external power supply, and the power supply management circuit 40 is cut off.

[0073] In this embodiment, when the weighing instrument does not need to be started, the external power supply is not connected to the external power supply circuit 10, the external power supply circuit 10 does not output the first voltage, the microprocessor 60 does not detect the first voltage, does not output the enable signal, and the power supply management circuit 40 is cut off. Since the power supply management circuit 40 is cut off, the power stored in the battery 20 will not be output to the outside. Conventional battery power supply does not manage the power supply. In this case, if the power stored in the battery 20 is output to the outside, power loss will be caused.

[0074] Combination Figure 1 and Figure 3 In some feasible embodiments, the external power supply circuit 10 includes:

[0075] A first conversion chip 11, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first inductor L1;

[0076] The input end of the first conversion chip 11 serves as the input end of the external power supply circuit 10, and is respectively connected to the external power supply, one end of the first capacitor C1, and one end of the second capacitor C2. The grounding end of the first conversion chip 11 is respectively connected to the ground, the other end of the first capacitor C1, the other end of the second capacitor C2, the positive electrode of the first diode D1, the other end of the third capacitor C3, the other end of the fifth capacitor C5, and the other end of the third resistor R3. The output end of the first conversion chip 11 is respectively connected to the negative electrode of the first diode D1 and one end of the first inductor L1. The other end of the first inductor L1 serves as the external power supply circuit 10. The output end of the circuit 10 is respectively connected to the input end of the power selection circuit 50, one end of the charging management circuit 30, one end of the third capacitor C3, one end of the fourth capacitor C4, one end of the fifth capacitor C5, one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is respectively connected to the detection end of the first conversion chip 11, one end of the third resistor R3 and the other end of the fourth capacitor C4, the other end of the second resistor R2 is respectively connected to one end of the fourth resistor R4 and the first end of the microprocessor 60 as the detection end of the external power supply circuit 10, and the other end of the fourth resistor R4 is grounded;

[0077] The first conversion chip 11 is used to convert the voltage of the external power supply into the first voltage U1.

[0078] In this embodiment, the first conversion chip 11 is a voltage conversion chip, through which the voltage of the external power supply is converted into the first voltage U1. The first conversion chip 11 of this embodiment can select any type of voltage conversion chip, but the voltage conversion chip needs to have the ability to convert the external power supply voltage into the first voltage, wherein the voltage of the external power supply can be DC 24 volts, and the first voltage can be DC 5 volts. In addition, the voltage conversion chip at least includes an input terminal, an output terminal, and a ground terminal. If other redundant ports are included, they can be connected according to actual production needs or the needs of the chip itself. The capacitors, inductors, and resistors in this embodiment are used for filtering and voltage stabilization. For example, one end of the first capacitor C1 and the second capacitor C2 are connected in parallel to the input terminal of the first conversion chip 11, and the other end is grounded, which is used to provide stable power input and filtering, reduce high-frequency noise and interference in the input voltage, and ensure that the first conversion chip 11 can obtain relatively stable power input; the first resistor R1 and the fourth capacitor C4 are used for RC (resistance / capacitance) filtering at the output terminal of the first conversion chip 11, etc. The first diode D1 is a Schottky diode, which is used for reverse voltage protection of the first conversion chip 11; the second resistor R2 and the fourth resistor R4 are used for voltage division, etc. The capacitors, resistors, inductors and other components used in this embodiment are necessary designs in the voltage conversion circuit, in order to better convert the voltage, and will not be described in detail in this embodiment.

[0079] Combination Figure 1 , Figure 3 and Figure 4 In some feasible embodiments, the charging management circuit 30 includes:

[0080] A battery management chip 31, a fifth resistor R5, a sixth resistor R6, a light emitting diode LED, and a sixth capacitor C6;

[0081] The power supply end of the battery management chip 31 is respectively connected to the other end of the first inductor L1 and one end of the sixth capacitor C6, the other end of the sixth capacitor C6 is grounded, the charging end of the battery management chip 31 is respectively connected to the cathode of the light emitting diode LED and one end of the fifth resistor R5, the other end of the fifth resistor R5 is respectively connected to the other end of the first inductor L1 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the anode of the light emitting diode LED, the ground end of the battery management chip 31 is grounded, and the output end of the battery management chip 31 is connected to the battery 20;

[0082] Wherein, the battery management chip 31 is used for protecting and controlling the charging process of the battery 20;

[0083] The light emitting diode LED is used to display the charging status.

[0084] In this embodiment, the battery management chip 11 is an integrated circuit specially designed for managing and protecting batteries, which can effectively monitor and protect the battery 20, extend the service life of the battery 20, and improve the safety and stability of the entire power supply system. The first voltage U1 enters the battery management chip 31 through the parallel connection of the fifth resistor R5 and the sixth resistor, and charges the battery 20 after processing, while monitoring and protecting during the charging process. The battery management chip 31 can be any type of chip, but it at least includes a charging terminal, an output terminal, a ground terminal and a power supply terminal. The power supply terminal of the power management chip 31 is directly connected to the first voltage U1, and no other power supply needs to be connected, saving costs. The sixth capacitor C6 is used for filtering, one end of the fifth resistor R5 is connected to the first voltage U1, and the other end is connected to the charging terminal of the battery management chip 31 for voltage division; the sixth resistor R6 is a variable resistor, and the charging current is adjusted by adjusting its resistance; the light-emitting diode LED is used to indicate the charging status, for example, the red light indicates that it is charging, and the green light indicates that it is fully charged.

[0085] Combination Figure 1 and Figure 5 In some feasible embodiments, the power supply management circuit 40 includes:

[0086] A second conversion chip 41, a second inductor L2, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14, and a first switch tube Q1;

[0087] The switch end of the second conversion chip 41 is connected to one end of the second inductor L2, the other end of the second inductor L2 is respectively connected to one end of the ninth capacitor C9, the input end of the second conversion chip 41, the battery 20 and one end of the seventh resistor R7, the other end of the ninth capacitor C9 is grounded, the other end of the seventh resistor R7 is respectively connected to one end of the eighth resistor R8 and the third end of the microprocessor 60, the other end of the eighth resistor R8 is grounded, the enable end of the second conversion chip 41 is respectively connected to one end of the ninth resistor R9 and the first end of the first switch tube Q1, the other end of the ninth resistor R9 is grounded, the second end of the first switch tube Q1 is respectively connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11 , the third end of the first switch tube Q1 is respectively connected to the other end of the tenth resistor R10 and the battery 20, the other end of the eleventh resistor R11 is connected to the second end of the microprocessor 60, the output end of the second conversion chip 41 is respectively connected to the input end of the power selection circuit 50, one end of the twelfth resistor R12, one end of the thirteenth resistor R13, one end of the seventh capacitor C7 and one end of the eighth capacitor C8, the feedback end of the second conversion chip 41 is respectively connected to the other end of the twelfth resistor R12, the other end of the seventh capacitor C7 and one end of the fourteenth resistor R14, the other end of the eighth capacitor C8 is grounded, the other end of the thirteenth resistor R13 is grounded, and the other end of the fourteenth resistor R14 is grounded;

[0088] Wherein, the first switch tube Q1 is used to be turned on according to the enable signal to enable the second conversion chip 41;

[0089] The second conversion chip 41 is used for converting the output voltage of the battery 20 into the second voltage U2.

[0090] In this embodiment, the second conversion chip 41 is a voltage conversion chip, through which the voltage output of the battery 20 is converted into a second voltage U2. The voltage conversion chip needs to increase the voltage output of the battery 20 to 5 volts, and the second conversion chip at least includes a switch terminal, an input terminal, an output terminal, and an enable terminal. If the selected chip includes other redundant ports, they can be connected according to actual production requirements or the requirements of the chip itself. The seventh resistor R7 and the eighth resistor R8 are used for voltage division, so that the microprocessor 60 is connected to the battery 20 to detect the power of the battery 20. When the microprocessor 60 detects the first voltage U1, it outputs an enable signal to the first switch tube Q1, so that the first switch tube Q1 is turned on. The voltage output by the battery 20 passes through the first switch tube Q1 to the enable end of the second conversion chip 41, so that the second conversion chip 41 is enabled. When the second conversion chip 41 is enabled, the switch end of the second conversion chip 41 is powered on, so that the input end and the output end of the second conversion chip 41 are connected, and the voltage output by the battery 20 can be converted into the second voltage U2 through the boost of the second conversion chip 41, wherein the first switch tube Q1 can be a triode, the first end of the first switch tube Q1 corresponds to the collector of the triode, the second end of the first switch tube Q1 corresponds to the base of the triode, and the third end of the first switch tube Q1 corresponds to the emitter of the triode. The ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11 are the output resistor, input resistor and base resistor of the triode respectively. The ninth capacitor C9 and the second inductor L2 are used for filtering and voltage stabilization at the input end of the second conversion chip 41. The seventh capacitor C7, the eighth capacitor C8, the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 are used for filtering and voltage stabilization at the output end of the second conversion chip 41. The capacitors, resistors, inductors, etc. used in this embodiment are all necessary designs in the voltage conversion circuit in order to better convert the voltage, and will not be described in detail in this embodiment.

[0091] Combination Figure 1 , Figure 3 and Figure 6 In some feasible embodiments, the power selection circuit 50 includes:

[0092] A fifteenth resistor R15, a sixteenth resistor R16, a second diode D2, a third diode D3, and a second switch tube Q2;

[0093] The anode of the second diode D2 serves as the first input terminal of the power selection circuit 50 and is connected to the other end of the first inductor L1. The cathode of the second diode D2 serves as the output terminal of the power selection circuit 50 and is respectively connected to the cathode of the third diode D3 and the weighing instrument. The anode of the third diode D3 is connected to the first end of the second switch tube Q2. The second end of the second switch tube Q2 is respectively connected to the other end of the first inductor L1, one end of the fifteenth resistor R15 and one end of the sixteenth resistor R16. The third end of the second switch tube Q2 serves as the second input terminal of the power selection circuit 50 and is respectively connected to the other end of the fifteenth resistor R15 and the output terminal of the second conversion chip 41. The other end of the sixteenth resistor R16 is grounded.

[0094] In this embodiment, the second diode D2 and the third diode D3 are used to prevent the first voltage U1 and the second voltage U2 from influencing each other. The second switch tube Q2 can be a P-type field effect tube, the first end of the second switch tube Q2 corresponds to the drain of the field effect tube, the second end of the second switch tube Q2 corresponds to the gate of the field effect tube, and the third end of the second switch tube Q2 corresponds to the source of the field effect tube. The fifteenth resistor R15 is the input resistor of the field effect tube, and the sixteenth resistor R16 is the gate resistor of the field effect tube. The first voltage U1 and the second voltage U2 can be selected by turning on or off the second switch tube Q2.

[0095] Combination Figure 1 and Figure 6 In some feasible embodiments, when the first input terminal is connected to the first voltage U1 and the second input terminal is connected to the second voltage U2, the second switch tube Q2 is turned off, and the output terminal of the power selection circuit 50 outputs the first voltage U1;

[0096] When the first input terminal is not connected to the first voltage U1 and the second input terminal is connected to the second voltage U2, the second switch tube Q2 is turned on, and the output terminal of the power selection circuit 50 outputs the second voltage U2.

[0097] In this embodiment, taking the second switch tube Q2 as a P-type field effect tube as an example, when the first voltage U1 and the second voltage U2 are simultaneously connected to the power selection circuit 50, since the gate and source of the P-type field effect tube are respectively connected to the first voltage U1 and the second voltage U2, and the voltage value of the first voltage U1 is equal to the voltage value of the second voltage U2, the gate and source voltage difference of the P-type field effect tube is 0, and the P-type field effect tube is not turned on. Therefore, the first voltage U1 is output to the weighing instrument through the second diode D2 to power the weighing instrument; when the first voltage U1 is not connected to the power selection circuit 50, and the second voltage U2 is connected to the power selection circuit 50, the source of the P-type field effect tube is connected to the second voltage U2, and the gate of the field effect tube is connected to the voltage after being divided by the fifteenth resistor R15, so the gate and source voltage difference of the P-type field effect tube is a negative voltage, the P-type field effect tube is turned on, and the second voltage U2 is output to the weighing instrument through the third diode D3 to power the weighing instrument.

[0098] This embodiment provides a power management device, which uses a first conversion chip, capacitors, resistors and other common components to form an external power supply circuit, converts the voltage of the external power supply to obtain a first voltage, which is used to power the weighing instrument and charge the battery; uses a battery management chip, capacitors, resistors and other common components to form a charging management circuit, which is used to manage the charging process of the battery to ensure the safety and reliability of charging; uses a second conversion chip, capacitors, resistors and other common components to form a power management circuit, which is used to convert the voltage output by the battery into a second voltage to power the weighing instrument; uses a diode, a switch tube, and a resistor to form a power selection circuit, which is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument. When the first voltage is normally connected, the first voltage is selected as the output voltage. When the first voltage is accidentally disconnected, the second voltage is automatically selected as the output voltage, ensuring the reliability of power supply. The microprocessor is used to turn on the power management circuit according to the first voltage. When the weighing instrument does not need to work, the microprocessor controls the power management circuit to be cut off to avoid the battery from supplying power to the outside and causing power loss. The power management device of this embodiment mostly uses components such as resistors, capacitors, diodes and switching tubes, and realizes automatic switching between external power supply and battery power supply of the weighing instrument on the basis of controlling costs, thereby improving the reliability of the power supply of the weighing instrument and avoiding the data loss and loss of connection of the weighing instrument caused by accidental disconnection of the external power supply. Furthermore, a microprocessor is used to manage and control the battery power supply. When the weighing instrument is not working, the power supply management circuit is controlled to be cut off, so that the battery cannot supply power to the outside, thereby realizing effective energy storage of the battery and solving the problem of battery power loss in conventional battery power supply methods.

[0099] In addition, the present application embodiment also provides an electronic device 01, referring to Figure 7 The electronic device 01 includes the power management device 02 provided in the above embodiment.

[0100] Since the electronic device proposed in this embodiment includes the power management device proposed in the above embodiments, it has the beneficial effects of the above embodiments. For details of the specific working process and principle of the power management device, please refer to the power management devices provided in the above embodiments, which will not be described one by one here, and are all within the protection scope of this embodiment.

[0101] It should be noted that the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0102] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power management device for supplying power to a weighing instrument, characterized in that: The power management device comprises: an external power supply circuit, wherein an input end of the external power supply circuit is connected to an external power supply, and the external power supply circuit is used to convert a voltage of the external power supply to output a first voltage; Battery; a charging management circuit, one end of which is connected to the output end of the external power supply circuit, and the other end of which is connected to the battery, and the charging management circuit is used to charge the battery through the first voltage; a power supply management circuit, one end of which is connected to the battery, and the power supply management circuit is used to convert the output voltage of the battery to output a second voltage; A power selection circuit, wherein the input end of the power selection circuit is respectively connected to the output end of the external power supply circuit and the output end of the power supply management circuit, the output end of the power selection circuit is connected to the weighing instrument, and the power selection circuit is used to select the first voltage or the second voltage as the output voltage to power the weighing instrument; A microprocessor, wherein a first end of the microprocessor is connected to a detection end of the external power supply circuit, and a second end of the microprocessor is connected to a controlled end of the power supply management circuit. The microprocessor is used to detect the first voltage and output an enable signal according to the first voltage to control the power supply management circuit to be turned on.

2. The power management device according to claim 1, wherein: The third terminal of the microprocessor is connected to the detection terminal of the power supply management circuit. The microprocessor is also used to detect the power level of the battery through the power supply management circuit and send an alarm signal when the power level is lower than a preset power level.

3. The power management device according to claim 1, wherein: When the weighing instrument needs to be started, if the external power supply circuit outputs the first voltage, the microprocessor outputs the enable signal to turn on the power supply management circuit and output the second voltage, and the power supply selection circuit selects the first voltage as the output voltage; If the first voltage is cut off after being output, the power selection circuit selects the second voltage as the output voltage.

4. The power management device according to claim 1, wherein: When the weighing instrument does not need to be started, the external power supply circuit is cut off from the external power supply, and the power supply management circuit is cut off.

5. The power management device according to claim 1, wherein: The external power supply circuit comprises: A first conversion chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first inductor; The input end of the first conversion chip serves as the input end of the external power supply circuit, and is respectively connected to the external power supply, one end of the first capacitor, and one end of the second capacitor; the ground end of the first conversion chip is respectively connected to the ground, the other end of the first capacitor, the other end of the second capacitor, the positive electrode of the first diode, the other end of the third capacitor, the other end of the fifth capacitor, and the other end of the third resistor; the output end of the first conversion chip is respectively connected to the negative electrode of the first diode and one end of the first inductor; the other end of the first inductor serves as the output end of the external power supply circuit, and is respectively connected to the input end of the power supply selection circuit, one end of the charging management circuit, one end of the third capacitor, one end of the fourth capacitor, one end of the fifth capacitor, one end of the first resistor, and one end of the second resistor; the other end of the first resistor is respectively connected to the detection end of the first conversion chip, one end of the third resistor, and the other end of the fourth capacitor; the other end of the second resistor serves as the detection end of the external power supply circuit and is respectively connected to one end of the fourth resistor and the first end of the microprocessor; the other end of the fourth resistor is grounded; Wherein, the first conversion chip is used to convert the voltage of the external power supply into the first voltage.

6. The power management device according to claim 5, characterized in that: The charging management circuit comprises: A battery management chip, a fifth resistor, a sixth resistor, a light emitting diode, and a sixth capacitor; The power supply end of the battery management chip is respectively connected to the other end of the first inductor and one end of the sixth capacitor, the other end of the sixth capacitor is grounded, the charging end of the battery management chip is respectively connected to the cathode of the light-emitting diode and one end of the fifth resistor, the other end of the fifth resistor is respectively connected to the other end of the first inductor and one end of the sixth resistor, the other end of the sixth resistor is connected to the anode of the light-emitting diode, the ground end of the battery management chip is grounded, and the output end of the battery management chip is connected to the battery; Wherein, the battery management chip is used for protecting and controlling the battery charging process; The light emitting diode is used to display the charging status.

7. The power management device according to claim 6, characterized in that: The power supply management circuit comprises: A second conversion chip, a second inductor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor, and a first switch tube; The switch end of the second conversion chip is connected to one end of the second inductor, the other end of the second inductor is respectively connected to one end of the ninth capacitor, the input end of the second conversion chip, the battery and one end of the seventh resistor, the other end of the ninth capacitor is grounded, the other end of the seventh resistor is respectively connected to one end of the eighth resistor and the third end of the microprocessor, the other end of the eighth resistor is grounded, the enable end of the second conversion chip is respectively connected to one end of the ninth resistor and the first end of the first switch tube, the other end of the ninth resistor is grounded, the second end of the first switch tube is respectively connected to one end of the tenth resistor and one end of the eleventh resistor, the third end of the first switch tube is respectively connected to the other end of the tenth resistor and the battery, the other end of the eleventh resistor is connected to the second end of the microprocessor, the output end of the second conversion chip is respectively connected to the input end of the power selection circuit, one end of the twelfth resistor, one end of the thirteenth resistor, one end of the seventh capacitor and one end of the eighth capacitor, the feedback end of the second conversion chip is respectively connected to the other end of the twelfth resistor, the other end of the seventh capacitor and one end of the fourteenth resistor, the other end of the eighth capacitor is grounded, the other end of the thirteenth resistor is grounded, and the other end of the fourteenth resistor is grounded; Wherein, the first switch tube is used to be turned on according to the enable signal to enable the second conversion chip; The second conversion chip is used for converting the output voltage of the battery into the second voltage.

8. The power management device according to claim 7, wherein: The power selection circuit comprises: A fifteenth resistor, a sixteenth resistor, a second diode, a third diode, and a second switch tube; The anode of the second diode serves as the first input terminal of the power selection circuit and is connected to the other end of the first inductor. The cathode of the second diode serves as the output terminal of the power selection circuit and is respectively connected to the cathode of the third diode and the weighing instrument. The anode of the third diode is connected to the first end of the second switch tube. The second end of the second switch tube is respectively connected to the other end of the first inductor, one end of the fifteenth resistor and one end of the sixteenth resistor. The third end of the second switch tube serves as the second input terminal of the power selection circuit and is respectively connected to the other end of the fifteenth resistor and the output terminal of the second conversion chip. The other end of the sixteenth resistor is grounded.

9. The power management device according to claim 8, characterized in that: When the first input terminal is connected to a first voltage and the second input terminal is connected to a second voltage, the second switch is turned off, and the output terminal of the power selection circuit outputs the first voltage; When the first input terminal is not connected to the first voltage and the second input terminal is connected to the second voltage, the second switch tube is turned on, and the output terminal of the power selection circuit outputs the second voltage.

10. An electronic device, characterized in that: The electronic device comprises the power management device according to any one of claims 1 to 9.

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