Long-distance transmission buck-boost system

Abstract

The utility model relates to the technical field of power supply of electric tools, in particular to a long-distance transmission buck-boost system, which comprises a boost module, a buck module and a transmission extension line. The boosting module is used for boosting the voltage input by the power interface, and the voltage reduction module is used for reducing the voltage boosted by the boosting module to the input voltage adaptive to the direct-current electric tool; the input end of the boost module is used for connecting a power supply, the output end of the boost module is connected to the input end of the step-down module through a transmission extension line, and the output end of the step-down module is used for connecting a direct-current electric tool. According to the utility model, the boosting module is arranged at the power supply port, the boosting module boosts the voltage and transmits the boosted voltage to the power receiving end of the tool, and then the voltage is converted into the input voltage adaptive to the direct-current electric tool by using the voltage reduction module, so that the lithium battery tool can be stably used, the problem of long-distance transmission loss can be reduced, and the service life of the lithium battery tool is prolonged. The price and the weight of the transmission wire can be reduced, and an operator can use the wire conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool power supply technical field, concretely relates to a long-distance transmission step-up and step-down system. BACKGROUND

[0002] In the application of lithium battery direct current electric tool, the battery pack as the power source is generally installed on the machine body for use. In some application scenarios that need to be used for a long time, a battery pack with larger capacity needs to be equipped, and the weight of the battery pack will increase in direct proportion to the increase of the capacity, which will cause the weight of the handheld tool to increase greatly, so that the user is extremely easy to feel fatigue in the operation process, which seriously affects the use experience.

[0003] To solve the above problems, one existing solution is to replace the battery pack installed on the machine body with a lighter connector, which is connected to a power source (or a car cigarette lighter power source) with larger capacity through a power line. However, when the distance between the power source and the tool is long, the existing solution is to directly use a wire as an extension line. However, since the power of the electric tool may reach more than 400W in actual work, the wire has a certain line resistance. In order to reduce the line loss, a very thick wire needs to be used. This not only greatly increases the weight of the wire, making it extremely inconvenient to use, but also makes the wire very expensive, resulting in a significant increase in cost. At the same time, considering the weight and price of the wire, the length of the extension connection line is also limited, which cannot fundamentally solve the pain point problem of lithium battery tools in the use process. SUMMARY

[0004] The utility model provides a long-distance transmission step-up and step-down system to solve the problems raised in the background.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A long-distance transmission step-up and step-down system, comprising a step-up module, a step-down module and a transmission extension line; the step-up module is used to increase the voltage input by the power source interface, and the step-down module is used to reduce the voltage increased by the step-up module to an input voltage suitable for a direct current electric tool;

[0007] The input end of the step-up module is used to connect the power source, the output end of the step-up module is connected to the input end of the step-down module through the transmission extension line, and the output end of the step-down module is used to connect the direct current electric tool.

[0008] Preferably, the voltage boosting module comprises a power management chip, at least four MOS tubes and an inductor, at least four pins of the power management chip are connected to control ends of the at least four MOS tubes respectively and are used for controlling on and off of the MOS tubes, and the inductor is used for storing energy when the MOS tubes are on and boosting voltage after being superimposed with input voltage.

[0009] Preferably, the power management chip is an EG1151 power management chip, the MOS tubes are four MOS tubes Q1, Q2, Q3 and Q4, and the No. 28 pin HO2, the No. 31 pin HO1, the No. 22 pin LO2 and the No. 23 pin LO1 of the EG1151 power management chip are connected to control ends of the four MOS tubes Q1, Q2, Q3 and Q4 respectively.

[0010] Preferably, the No. 13 pin of the EG1151 power management chip is connected to an output end of the voltage boosting module, and the EG1151 power management chip is used for reading voltage values output by the voltage boosting module through the No. 13 pin and controlling and stabilizing output voltage.

[0011] Preferably, the voltage boosting module further comprises a first filter circuit and a second filter circuit, the first filter circuit is connected at an input end of the voltage boosting module, and the second filter circuit is connected at an output end of the voltage boosting module.

[0012] Preferably, the voltage boosting module comprises a voltage boosting chip used for voltage dropping processing of input voltage, the voltage boosting chip receives voltage transmitted by a transmission extension line through an input pin and outputs voltage adapted to the direct current electric tool through an output pin.

[0013] Preferably, the voltage boosting module is a wire with a cross-sectional area of 1 mm2.

[0014] Preferably, the direct current electric tool is a lithium battery direct current electric tool.

[0015] By adopting the technical scheme, the utility model has the beneficial effects that:

[0016] In the utility model, the voltage boosting module is arranged at the power port, the voltage boosting module transmits voltage after voltage boosting to a power receiving end of the tool, then the voltage is converted into input voltage adapted to the direct current electric tool by the voltage dropping module, so that the lithium battery tool can be stably powered, the method can reduce the problem of long-distance transmission loss, can reduce the price and weight of transmission wire and is convenient for operators to use. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a whole structure schematic view of the utility model.

[0018] Fig. 2The utility model discloses a boost module circuit schematic diagram.

[0019] Fig. 3 The utility model discloses a buck module circuit schematic diagram.

[0020] In the drawing: 1, boost module, 2, buck module, 3, transmission extension line. Specific implementation

[0021] In order to more clearly understand above-mentioned purpose, feature and advantage of the utility model, below, combining with the drawings and embodiment, the utility model will be further explained.It is to be explained that in the non-conflict situation, the embodiment of the application and the feature in the embodiment can be combined mutually.

[0022] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the utility model is not limited to the specific embodiment disclosed in the following disclosure.

[0023] As Figs. 1-3 The utility model provides a kind of long-distance transmission boost and buck system, including boost module 1, buck module 2 and transmission extension line 3;Boost module 1 is used to increase the voltage input by power interface, buck module 2 is used to reduce the voltage after boost module 1 is increased to the input voltage adapted to direct current electric tool;

[0024] The input end of boost module 1 is used to connect power supply, and the output end of boost module 1 is connected to the input end of buck module 2 through transmission extension line 3, and the output end of buck module 2 is used to connect direct current electric tool.

[0025] Specifically, input voltage is transmitted to remote output module after improving voltage by boost module 1 and is reduced to direct supply electricity use of adaptation consumer, and its core is boost-transmission-buck;Further, the advantages achieved by this kind of mode are: reduce long-distance transmission loss and the price and weight of transmission wire, facilitate operator to use.

[0026] As further, boost module 1 includes power management chip, at least four MOS tubes and inductance, and the control end of at least four MOS tubes is connected to the at least four pins of power management chip respectively, and is used to control the conduction and closing of MOS tube, and inductance is used to store energy when MOS tube is conducted, and is added to input voltage after boost.

[0027] As further, the power management chip is an EG1151 power management chip, and the MOS tubes are Q1, Q2, Q3 and Q4, and the No. 28 pin HO2, the No. 31 pin HO1, the No. 22 pin LO2 and the No. 23 pin LO1 of the EG1151 power management chip are connected to the control ends of the Q1, Q2, Q3 and Q4 MOS tubes.

[0028] As further, the No. 13 pin of the EG1151 power management chip is connected to the output end of the voltage boosting module 1, and the EG1151 power management chip is used for reading the voltage value output by the voltage boosting module 1 through the No. 13 pin, and the output voltage is controlled and stabilized, and the EG1151 power management chip reads the output voltage value through the No. 13 pin, and the output voltage is controlled and stabilized in real time (such as 48V).

[0029] As further, the voltage boosting module 1 further comprises a first filter circuit and a second filter circuit, and the first filter circuit is connected at the input end of the voltage boosting module 1, and the second filter circuit is connected at the output end of the voltage boosting module 1.

[0030] As further, the voltage reducing module 2 comprises a voltage reducing chip for reducing the input voltage, and the voltage reducing chip receives the voltage transmitted by the transmission extension line 3 through the input pin, and outputs the voltage suitable for the direct current electric tool through the output pin.

[0031] As further, the voltage reducing module 2 is a wire with a cross-sectional area of 1mm².

[0032] The utility model discloses a voltage boosting circuit is added to the power port (such as 12V power supply), and the voltage (such as 48V) is transmitted to the power receiving end of the tool, and then the voltage is converted into 20V by the voltage reducing circuit, so as to supply power to the lithium battery tool, which not only can reduce the cost and weight per meter of the transmission wire, but also can realize the long-time use of the lithium battery tool, and can obviously reduce the tool use fatigue, and is friendly to the operator.

[0033] The core calculation is illustrated as follows:

[0034] If the tool is powered by the 12V voltage through the 10-meter long extension line, and the tool power is 500W, the expected current is about 40A, and in this case, the wire with a cross-sectional area of 6mm² is required to ensure safe transmission, and the resistance of the wire with a cross-sectional area of 6mm² per meter is about 3 milliohms, and since there are positive and negative loops, the total length of the wire is 20 meters, and according to the power calculation formula P=I²R, the power consumed on the wire is as high as 100W, and at this time, the use efficiency of the tool end is only 80%.

[0035] And by using the technical scheme, the voltage is first boosted to 48V by the boosting module 1 before transmission, and the same 500W power tool is powered, at this time, the current is expected to be greatly reduced to 10A, so that only a wire with a cross-sectional area of 1mm2 is required, and the resistance of 1mm2 wire per meter is about 17mΩ, and the total length of the 10-meter extension cord under the positive and negative loops is 20 meters, according to the power calculation formula P=I2R, the power consumed on the wire is only 35W, at this time, the use efficiency of the tool end is improved to 93%.

[0036] Therefore, the technical scheme significantly improves the energy use efficiency, not only reduces the specification requirement of the wire, but also reduces the weight of the transmission system, greatly reduces the cost, and has excellent application advantages and economic value.

[0037] Further, the direct current electric tool is a lithium battery direct current electric tool.

[0038] The working principle and use process of the utility model are as follows: first, connect the voltage reducing module 2 with the lithium battery direct current electric tool, and connect the voltage reducing module 2 with the voltage boosting module 1 through the transmission extension cord 3, then connect the input end VIN of the voltage boosting module 1 with the vehicle-mounted 12V interface, so that the control of the EG1151 power management chip can realize the energy storage of the inductor L1 when the MOS tube is turned on, the voltage of the input is superimposed, the effect of voltage boosting is realized, then the output end VOUT of the voltage boosting module 1 is transmitted to the tool use place through the transmission extension cord 3, and then the voltage is reduced to the input voltage of the circular electric tool through the voltage reducing module 2, which is beneficial to the direct power supply of the electric appliance, effectively reduces the problem of long-distance transmission loss, and also reduces the price and weight of the transmission wire, reduces the cost, is light in weight, and is convenient for operators to use.

[0039] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A long-distance transmission boost / buck system, characterized in that, It includes a boost module (1), a buck module (2), and a transmission extension line (3); the boost module (1) is used to increase the voltage input from the power interface, and the buck module (2) is used to decrease the voltage increased by the boost module (1) to a voltage suitable for the input voltage of a DC power tool; The input terminal of the boost module (1) is used to connect to a power supply. The output terminal of the boost module (1) is connected to the input terminal of the buck module (2) via a transmission extension line (3). The output terminal of the buck module (2) is used to connect to a DC power tool.

2. The long-distance transmission boost / buck system according to claim 1, characterized in that, The boost module (1) includes a power management chip, at least four MOSFETs and an inductor. At least four pins of the power management chip are respectively connected to the control terminals of at least four MOSFETs and are used to control the conduction and shutdown of the MOSFETs. The inductor is used to store energy when the MOSFETs are turned on and boosts the voltage by superimposing it with the input voltage.

3. The long-distance transmission boost / buck system according to claim 2, characterized in that, The power management chip is an EG1151 power management chip, and the MOSFETs are four MOSFETs: Q1, Q2, Q3, and Q4. Pins 28 (HO2), 31 (HO1), 22 (LO2), and 23 (LO1) of the EG1151 power management chip are respectively connected to the control terminals of the four MOSFETs: Q1, Q2, Q3, and Q4.

4. The long-distance transmission boost / buck system according to claim 3, characterized in that, The 13th pin of the EG1151 power management chip is connected to the output terminal of the boost module (1), and the EG1151 power management chip uses the 13th pin to read the voltage value output by the boost module (1) and control and stabilize the output voltage.

5. The long-distance transmission boost / buck system according to claim 1, characterized in that, The boost module (1) further includes a first filter circuit and a second filter circuit. The first filter circuit is connected to the input terminal of the boost module (1), and the second filter circuit is connected to the output terminal of the boost module (1).

6. The long-distance transmission boost / buck system according to claim 1, characterized in that, The step-down module (2) includes a step-down chip for step-down processing of the input voltage. The step-down chip receives the voltage transmitted by the transmission extension line (3) through the input pin and outputs the voltage adapted to the DC power tool through the output pin.

7. The long-distance transmission boost / buck system according to claim 1, characterized in that, The step-down module (2) is a wire with a cross-sectional area of ​​1 mm².

8. The long-distance transmission boost / buck system according to claim 1, characterized in that, The DC power tool is a lithium-ion battery DC power tool.

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