Power supply stabilizing circuit and equipment

Abstract

The invention discloses a power supply stabilizing circuit and equipment, and is applied to the technical field of power supply. The circuit comprises a power supply circuit, at least one DC / DC converter and at least one auxiliary battery. In the design, the DC / DC converter and the auxiliary battery are connected with the power supply circuit and the load assembly, and when the power supply voltage output by the main battery in the power supply circuit is unstable, the auxiliary battery is charged or the connection with the auxiliary battery is disconnected through the characteristic that the DC / DC converter outputs the fixed voltage; however, the auxiliary battery is not affected to provide the safe starting voltage required by starting for the electric load in the load assembly by means of the electric quantity and the voltage of the auxiliary battery. It is ensured that an electric load in the load assembly cannot work normally due to the fact that the power supply voltage output by the power supply circuit is unstable, so that the probability that the load assembly reports errors, malfunctions and even self-protection shutdown is reduced, and then potential safety hazards brought by engineering machinery or a vehicle in the using process are reduced.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply stabilization circuit and device. Background Technology

[0002] The power supply circuit of existing construction machinery or vehicles typically includes an internal combustion engine, a starter motor, a generator, a battery, a switch, and electrical loads. The internal combustion engine is the power source and energy source for the machinery or vehicle, and is connected to the starter motor and generator. The internal combustion engine is also equipped with a battery; the battery is connected to the generator and electrical loads, and also to the starter motor via a switch. The starter motor is used to start the internal combustion engine, which then drives the generator to produce electricity. The electrical energy generated by the generator is stored in the battery, which powers the starter motor and electrical loads, as well as other electrical equipment on the machinery or vehicle.

[0003] For the power supply circuits of medium and large-sized construction machinery or vehicles, the operating voltage of the batteries, starter motors, generators, and electric loads is usually 24V, and the batteries are typically lead-acid batteries. Due to the characteristics of electrical hardware, the power supply voltage is allowed to fluctuate to a certain extent, but excessively high or low power supply voltages will cause electrical equipment to malfunction. For example, the electric load, which consists of a motor driver and a load motor, has a minimum allowable operating voltage of 18V, which is usually sufficient. However, in actual use, it has been found that at the moment of starter motor startup, due to factors such as low ambient temperature, excessive starting resistance of the internal combustion engine, excessive starter motor output power, and insufficient battery capacity and instantaneous output power, the battery load is relatively too large at the moment of starter motor startup. The battery output voltage drops rapidly and falls below 18V for a short period of time. This causes the electric load (motor driver and load motor) to malfunction because the power supply voltage is below the lower limit. The motor driver may report an error, malfunction, or even shut down for self-protection, thus affecting the normal use of the construction machinery or vehicle and creating safety hazards.

[0004] In view of the above-mentioned technology, finding a power supply circuit that can provide the required power supply voltage to the electric load at the moment of starting the motor is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a power supply stabilization circuit and device. This solves the problem in existing conventional power supply circuits where the supply voltage drops below the lower limit of the electric load at startup, causing the electric load to fail to operate, and consequently leading to errors, malfunctions, or self-protection shutdowns of the motor driver.

[0006] To solve the above-mentioned technical problems, this application provides a power supply stabilization circuit, including: a power supply circuit, at least one DC / DC converter and at least one auxiliary battery, wherein each DC / DC converter adopts a unidirectional topology;

[0007] The output terminal of the main battery in the power supply circuit is connected to the input terminal of each DC / DC converter, and is used to provide power supply voltage to the DC / DC converter through the main battery after startup.

[0008] The output terminal of each DC / DC converter is connected to the input terminal of the corresponding auxiliary battery. When the supply voltage meets the normal operation criteria of the DC / DC converter, the auxiliary battery is charged by the supply voltage; when the supply voltage does not meet the normal operation criteria, the connection with the auxiliary battery is disconnected.

[0009] The output terminals of each auxiliary battery are connected to the corresponding electric loads in the load assembly, and are used to provide the safe starting voltage required for starting to the corresponding electric loads when the power supply circuit is started.

[0010] Preferably, the DC / DC converter is a buck-boost converter with a unidirectional topology, and the rated input voltage of the buck-boost converter is equal to the rated output voltage.

[0011] Preferably, the DC / DC converter is a non-isolated buck-boost converter.

[0012] Preferably, the power supply circuit further includes: an internal combustion engine, a starter motor, and a generator;

[0013] The internal combustion engine is connected to the starter motor via the first transmission mechanism;

[0014] The internal combustion engine is connected to the generator via a second transmission mechanism;

[0015] The positive terminal of the starter motor is connected to the positive terminal of the generator, and then connected to the positive terminal of the main battery.

[0016] The negative terminal of the starter motor is connected to the negative terminal of the generator, and then connected to the negative terminal of the main battery.

[0017] Preferably, the internal combustion engine is connected to the starter motor via a gear transmission mechanism.

[0018] Preferably, the internal combustion engine is connected to the generator via a belt drive mechanism.

[0019] Preferably, the power supply circuit further includes: a switching assembly;

[0020] The first end of the switch assembly is connected to the positive terminal of the starter motor;

[0021] The second terminal of the switch assembly is connected to the positive terminal of the main battery.

[0022] On the other hand, this application also provides an electronic device including the aforementioned power supply stabilization circuit.

[0023] The power supply stabilization circuit provided in this application includes a power supply circuit, at least one DC / DC converter, and at least one auxiliary battery. The power supply circuit primarily supplies power to the subsequently connected load components. At the moment of power supply circuit startup, due to its inherent hardware characteristics, the power supply voltage output from the internal main battery is unstable, thus failing to reach the safe startup voltage required for the load components. In this design, at least one DC / DC converter and the auxiliary battery connect the power supply circuit and the load components. When the power supply voltage output from the main battery is unstable, but the degree of instability does not affect the normal operation of the DC / DC converter, the power supply voltage output from the main battery supplies power to the auxiliary battery through the DC / DC converter. However, when the degree of instability affects the normal operation of the DC / DC converter, the DC / DC converter acts as an open switch, disconnecting the auxiliary battery from the power supply circuit. The auxiliary battery then continuously provides the safe startup voltage required for the corresponding electric load in the connected load components using its own charge and voltage. In this design, the main function of the DC / DC converter is to charge the auxiliary battery, which in turn supplies power to the electric loads. Due to the fixed output voltage of the DC / DC converter, the charging process of the auxiliary battery is stable. Simultaneously, the auxiliary battery is unaffected by the moment the power supply circuit starts up, thus ensuring a stable power supply to the electric loads. In other words, the power supply stabilization circuit provided in this application ensures that each electric load in the load assembly will not malfunction due to unstable output voltage from the power supply circuit, thereby reducing the probability of load assembly errors, erroneous actions, or even self-protection shutdowns, and consequently reducing safety hazards during the use of construction machinery or vehicles. Attached Figure Description

[0024] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A structural diagram of a power supply stabilization circuit provided in an embodiment of this application;

[0026] Figure 2 A first circuit diagram of the power supply stabilization circuit provided in the embodiments of this application;

[0027] Figure 3 A second circuit diagram of the power supply stabilization circuit provided in the embodiments of this application;

[0028] Figure 4 A third circuit diagram of the power supply stabilization circuit provided in the embodiments of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0030] The core of this application is to provide a power supply stabilization circuit and device.

[0031] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Figure 1 A structural diagram of a power supply stabilization circuit provided in an embodiment of this application is shown below. Figure 1 As shown, it includes: a power supply circuit 1, at least one DC / DC converter 2, and at least one auxiliary battery 4. In addition, Figure 1 It also includes load component 3. And... Figure 1 The power supply circuit 1 also includes the main battery 11 and the electric load 31 in the load assembly 3, and the number of electric loads 31 is at least one. It should be noted here that... Figure 1 The power supply stabilization circuit shown has one DC / DC converter 2, one auxiliary battery 4, and one electric load 31.

[0033] The connection relationship of its power supply stabilization circuit is as follows: the output terminal of the main battery 11 in the power supply circuit 1 is connected to the input terminal of each DC / DC (Direct Current to Direct Current) converter 2; the output terminal of each DC / DC converter 2 is connected to the input terminal of each corresponding auxiliary battery 4; the output terminal of each auxiliary battery 4 is connected to each corresponding electric load 31 in the load component 3.

[0034] In specific embodiments, such as Figure 2 As shown, its power supply circuit 1 includes, in addition to the main battery 11, an internal combustion engine 12, a starter motor 13, a generator 14, and a switch assembly 15.

[0035] Its internal combustion engine 12 is connected to the starter motor 13 through a gear transmission mechanism; the internal combustion engine 12 is connected to the generator 14 through a belt transmission mechanism; the positive terminal of the main battery 11 is connected to the starter motor 13 through a switch assembly 15 and is also connected to the positive terminal of the generator 14; the negative terminal of the starter motor 13 is connected to the negative terminal of the generator 14 and is also connected to the negative terminal of the main battery 11.

[0036] In a specific embodiment, the internal combustion engine 12 is the power source and energy source for the construction machinery or vehicle. The internal combustion engine 12 is connected to the starter motor 13 via a gear transmission mechanism, and to the generator 14 via a belt transmission mechanism. The starter motor 13 is used to start the internal combustion engine 12. After starting, the internal combustion engine 12 drives the generator 14 to generate electricity via the belt transmission mechanism. After the generator 14 generates electricity, the generated electrical energy is stored in the main battery 11, so that the main battery 11 can be used to power the starter motor 13, and also to power other electrical equipment on the construction machinery or vehicle, i.e., the load assembly 3.

[0037] However, during the use of power supply circuit 1, due to limitations in electrical hardware characteristics, at the instant power supply circuit 1 starts (that is, within 1 second of the starter motor 13 starting), due to factors such as low ambient temperature, excessive starting resistance of internal combustion engine 12, excessive output power of starter motor 13, and insufficient capacity and instantaneous output power of main battery 11, the load on main battery 11 becomes relatively excessive at the instant start of starter motor 13. The supply voltage output by main battery 11 drops rapidly and falls below 18V for a short period. Consequently, load components 3 (e.g., motor driver and load motor) cannot function properly due to the supply voltage falling below the lower limit. Based on this, this application adds at least one DC / DC converter 2 and at least one auxiliary battery 4 to power supply circuit 1 and load components 3. Therefore, its current working principle is as follows: At the moment of startup of power supply circuit 1, the power supply voltage output by the main battery 11 is unstable. When the unstable power supply voltage meets the normal operation criteria of DC / DC converter 2, it indicates that DC / DC converter 2 can work normally. At this time, DC / DC converter 2 mainly charges the connected auxiliary battery 4 through the power supply voltage. During this process, it will not affect the auxiliary battery 4 from providing the safe starting voltage required for the connected electric load 31. When the unstable power supply voltage does not meet the normal operation criteria of DC / DC converter 2, it indicates that DC / DC converter 2 cannot work normally. At this time, DC / DC converter 2 is equivalent to an open switch, disconnecting the connection between auxiliary battery 4 and power supply circuit 1. That is to say, DC / DC converter 2 cannot charge auxiliary battery 4 according to the power supply voltage, but it does not affect the auxiliary battery 4 from providing the safe starting voltage required for the connected electric load 31.

[0038] In other words, in the power supply stabilization circuit provided in this application, the DC / DC converter 2 has two operating states. In normal operation, it charges the auxiliary battery 4 by adjusting the supply voltage to a stable target voltage. The auxiliary battery 4 then provides the connected electric load 31 with the safe starting voltage required for startup using its own charge and voltage. In abnormal operation, the auxiliary battery 4 is disconnected from the power supply circuit 1, but it still provides the connected electric load 31 with the safe starting voltage required for startup using its own charge and voltage. Due to the fixed output voltage characteristic of the DC / DC converter 2, its charging process for the auxiliary battery 4 is stable. Simultaneously, the auxiliary battery 4 is unaffected by the startup instant of the power supply circuit 1, and its power supply to the electric load 31 is also stable, thus ensuring that each electric load 31 in the load assembly 3 will not fail to operate normally due to unstable voltage output from the power supply circuit 1. Therefore, it is easy to understand that the power supply stabilization circuit provided in this application is used to start the motor 13 at startup, with the aim of ensuring stable power supply to the electric load 31.

[0039] Based on the above working principle, it is easy to understand that in the power supply stabilization circuit provided in this application, the main battery 11 can supply power to the auxiliary battery 4 through the DC / DC converter 2, but the auxiliary battery 4 cannot, in turn, supply power to the main battery 11 through the DC / DC converter 2. The unidirectional topology of the DC / DC converter 2 further supports the principle that the main battery 11 can only supply power to the auxiliary battery 4 through the unidirectional DC / DC converter 2 in the power supply stabilization circuit. Therefore, it is easy to understand that the auxiliary battery 4 is not used for energy recovery during vehicle braking.

[0040] It should be noted that the number of DC / DC converters 2, the number of auxiliary batteries 4, and the number of electric loads 31 in the load assembly 3 are all at least one, so the specific connection relationship will vary depending on the different numbers.

[0041] When the number of current-stage circuits is the same as the number of connected subsequent-stage circuits, the connection relationship between them is one-to-one. When the number of current-stage circuits is greater than the number of connected subsequent-stage circuits, the connection relationship between them is partly one-to-one and partly many-to-one. When the number of current-stage circuits is less than the number of connected subsequent-stage circuits, the connection relationship between them is partly one-to-one and partly one-to-many. Specifically, if the DC / DC converter 2 is the preceding stage circuit for the auxiliary battery 4, then the auxiliary battery 4 is the following stage circuit for the DC / DC converter 2. Similarly, the auxiliary battery 4 is the preceding stage circuit for the electric load 31, and the electric load 31 is the following stage circuit for the auxiliary battery 4.

[0042] This application provides two examples: when the number of DC / DC converters 2 and the number of auxiliary batteries 4 are the same (both are 1), while the number of electric loads 31 is multiple, the corresponding circuit diagram is as follows. Figure 3 As shown; when the number of DC / DC converters 2 and the number of auxiliary batteries 4 are the same, and there are multiple of each, while the number of electric loads 31 is greater than the number of DC / DC converters 2 or the number of auxiliary batteries 4, the corresponding circuit diagram is as follows. Figure 4 As shown.

[0043] In this design, the auxiliary battery 4 can be a 12V or 24V ordinary lead-acid battery; while the DC / DC converter 2 can be divided into buck converter, step-up transformer, buck-boost converter and flyback converter in terms of function selection. However, based on functional and cost considerations, a non-isolated buck-boost converter with a unidirectional topology can be preferred, and the rated input voltage is equal to the rated output voltage (e.g., 24V).

[0044] The main reason for this choice is that, for 24V to 24V converters with the same input and output voltages, buck-boost converters offer advantages in voltage adaptability, stability, and efficiency optimization, while also providing wide input range, bidirectional capability, and high power density. Therefore, considering voltage matching requirements, system protection, efficiency, and cost-effectiveness, a non-isolated buck-boost converter is the preferred option.

[0045] In other words, in practical applications, for 24V to 24V voltage regulation requirements, non-isolated buck-boost converters should be preferred, unless the system has special safety isolation requirements.

[0046] It is not difficult to understand that in practical applications, when there are multiple electric loads 31, their specific load types can differ, such as motor drivers or load motors, and the specific model parameters of multiple motor drivers or load motors can also differ; similarly, when there are multiple DC / DC converters 2, the manufacturers of each DC / DC converter 2 can differ, as long as the functional requirements are met; similarly, when there are multiple auxiliary batteries 4, their specific battery types and parameters can also differ.

[0047] It should be noted that the specific structure of the power supply circuit and the selection of the DC / DC converter 2 provided in this application are only one possible implementation method, but are not limited to this implementation method. They can be set according to the needs of the application.

[0048] Among them, for Figures 1-4 It should be noted that, Figures 1-4The solid line in the diagram represents the circuit containing the positive electrode; the dashed line represents the circuit containing the negative electrode.

[0049] Therefore, the power supply stabilization circuit provided in this application includes a power supply circuit, at least one DC / DC converter, and at least one auxiliary battery. The power supply circuit primarily supplies power to the subsequently connected load components. At the moment the power supply circuit starts up, its hardware characteristics cause the power supply voltage output from the internal main battery to be unstable, thus failing to reach the safe starting voltage required for the load components to start. In this design, at least one DC / DC converter and the auxiliary battery connect the power supply circuit and the load components. When the power supply voltage output from the main battery is unstable, but the degree of instability does not affect the normal operation of the DC / DC converter, the power supply voltage output from the main battery supplies power to the auxiliary battery through the DC / DC converter. However, when the degree of instability affects the normal operation of the DC / DC converter, the DC / DC converter acts as an open switch, disconnecting the auxiliary battery from the power supply circuit. The auxiliary battery then continuously provides the safe starting voltage required for the corresponding electric load in the connected load components using its own charge and voltage. In this design, the main function of the DC / DC converter is to charge the auxiliary battery, which in turn supplies power to the electric loads. Due to the fixed output voltage of the DC / DC converter, the charging process of the auxiliary battery is stable. Simultaneously, the auxiliary battery is unaffected by the moment the power supply circuit starts up, thus ensuring a stable power supply to the electric loads. In other words, the power supply stabilization circuit provided in this application ensures that each electric load in the load assembly will not malfunction due to unstable output voltage from the power supply circuit, thereby reducing the probability of load assembly errors, erroneous actions, or even self-protection shutdowns, and consequently reducing safety hazards during the use of construction machinery or vehicles.

[0050] Simply put, this application adds a DC / DC converter and an auxiliary battery between the conventional power supply circuit and load components. This ensures a more stable power supply voltage for some electric loads (motor drivers and load motors) on construction machinery or vehicles, meeting their minimum or maximum power supply voltage requirements. During the start-up of the internal combustion engine, when the voltage of the starter motor's battery is too low or too high, it still ensures that other electric loads can work normally without affecting the normal use of the construction machinery or vehicles or posing any safety hazards.

[0051] On the other hand, this application also provides an electronic device that includes the above-described power supply stabilization circuit and has the same beneficial effects.

[0052] Since the embodiments of the electronic devices provided in this application are the same as the embodiments of the power supply stabilization circuit described above, this application will not repeat them here.

[0053] The power supply stabilization circuit and device provided in this application have been described in detail above. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0054] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A power supply stabilization circuit, characterized in that, include: The system includes a power supply circuit, at least one DC / DC converter, and at least one auxiliary battery, wherein each DC / DC converter adopts a unidirectional topology. The output terminal of the main battery in the power supply circuit is connected to the input terminal of each of the DC / DC converters, and is used to provide power supply voltage to the DC / DC converters through the main battery after startup. The output terminal of each DC / DC converter is connected to the input terminal of the corresponding auxiliary battery, so that when the supply voltage meets the normal operation criteria of the DC / DC converter, the auxiliary battery is charged by the supply voltage; when the supply voltage does not meet the normal operation criteria, the connection with the auxiliary battery is disconnected. The output terminal of each auxiliary battery is connected to the corresponding electric load in the load assembly, and is used to provide the safe starting voltage required for starting to the corresponding electric load when the power supply circuit is started.

2. The power supply stabilization circuit according to claim 1, characterized in that, The DC / DC converter is a buck-boost converter under the unidirectional topology, and the rated input voltage of the buck-boost converter is equal to the rated output voltage.

3. The power supply stabilization circuit according to claim 2, characterized in that, The DC / DC converter is a non-isolated buck-boost converter.

4. The power supply stabilization circuit according to any one of claims 1-3, characterized in that, The power supply circuit also includes: an internal combustion engine, a starter motor, and a generator; The internal combustion engine is connected to the starter motor via a first transmission mechanism; The internal combustion engine is connected to the generator via a second transmission mechanism; The positive terminal of the starter motor is connected to the positive terminal of the generator, and is also connected to the positive terminal of the main battery; The negative terminal of the starter motor is connected to the negative terminal of the generator, and is also connected to the negative terminal of the main battery.

5. The power supply stabilization circuit according to claim 4, characterized in that, The internal combustion engine is connected to the starter motor via a gear transmission mechanism.

6. The power supply stabilization circuit according to claim 4, characterized in that, The internal combustion engine is connected to the generator via a belt drive mechanism.

7. The power supply stabilization circuit according to claim 4, characterized in that, The power supply circuit also includes: a switching assembly; The first end of the switch assembly is connected to the positive terminal of the starter motor; The second end of the switch assembly is connected to the positive terminal of the main battery.

8. An electronic device, characterized in that, Includes the power supply stabilization circuit as described in any one of claims 1-7.

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