Power output device for audio DFU work station

Abstract

The utility model aims to provide the power supply output device for the audio DFU work station, which is high in power supply efficiency, strong in applicability, strong in portability and capable of effectively reducing circuit abnormal risks. The circuit comprises a boost module, a first step-down module and a second step-down module, the boost module comprises a first switching regulator and a first electronic fuse, power supply input sequentially flows through the first switching regulator and the first electronic fuse until power supply output, and 24V-to-fixed 27V output is carried out; the first step-down module comprises a second switching regulator and a second electronic fuse, the power supply input sequentially flows through the second switching regulator and the second electronic fuse until the power supply output, and 24V-to-5V-15V adjustable output is carried out; the second voltage reduction module comprises a third switching regulator and a third electronic fuse, the power supply input sequentially flows through the third switching regulator and the third electronic fuse until the power supply output, and the 24V-to-10-16V adjustable output is carried out. The utility model is applied to the technical field of audio DFU electronic test equipment.

Description

Technical Field

[0001] The utility model is applied to the technical field of audio DFU electronic testing equipment, and particularly relates to a power output device for an audio DFU workstation. Background Art

[0002] DUT refers to the device under test; DC-DC refers to a DC-DC power supply; LDO refers to a low-dropout linear regulator; OVP refers to overvoltage protection; UVLO refers to low-voltage shutdown.

[0003] In the test system, the most commonly used power supply module on the board is the DC-DC circuit. Some circuits with lower power requirements can also use the LDO circuit as the power supply. Commonly used DC-DC circuits include Boost boost circuit and Buck buck circuit. Boost boost can make the voltage output value greater than the voltage input value, and Buck buck circuit can make the voltage output value less than the voltage input value. Through the voltage conversion of the DC-DC circuit, the voltage required for the DUT to work can be obtained.

[0004] The commonly used DC-DC circuits at present mainly consist of power control chips, power inductors, input / output capacitors, diodes and their topological circuits. It mainly relies on the switch in the power control chip to continuously close and open the input power, and then achieves the output of the target power through the rectification and regulation of the inductor and capacitor. Compared with the LDO circuit, the more prominent advantages of the DC-DC circuit are high efficiency and relatively large output power.

[0005] However, although the power supply chip in the existing DC-DC circuit has integrated OVP or UVLO protection, the values ​​of OVP and UVLO are basically fixed and cannot be adjusted. They cannot be adjusted to appropriate values ​​according to the actual needs of the circuit to achieve the goal of protecting the load circuit. At the same time, the power output may also be damaged. Therefore, it is necessary to provide a power output device for an audio DFU workstation that has high power efficiency, strong applicability, strong portability, and effectively reduces the risk of circuit abnormalities. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a power output device for an audio DFU workstation which has high power efficiency, strong applicability, strong portability and effectively reduces the risk of circuit abnormalities.

[0007] The technical solution adopted by the utility model is as follows: the utility model comprises a boost module, a first buck module and a second buck module, the boost module comprises a first switching regulator and a first electronic fuse, the power input sequentially flows through the first switching regulator and the first electronic fuse until the power output, and 24V is converted to a fixed 27V output; the first buck module comprises a second switching regulator and a second electronic fuse, the power input sequentially flows through the second switching regulator and the second electronic fuse until the power output, and 24V is converted to an adjustable output of 5V~15V; the second buck module comprises a third switching regulator and a third electronic fuse, the power input sequentially flows through the third switching regulator and the third electronic fuse until the power output, and 24V is converted to an adjustable output of 10~16V.

[0008] It can be seen from the above scheme that this scheme integrates a 27V / 1.5A fixed output with an electronic fuse, a 5V~15V / 2A adjustable output with an electronic fuse, and a 10V~16V / 0.1A adjustable output with an electronic fuse. These three power outputs can be packaged into a power module. Parameters such as OVP / UVLO / current limiting protection can be adjusted according to the actual needs of the circuit. It has wide applicability, can calibrate the adjustable output power supply, and the output accuracy can be close to the output of the instrument. The cost can be controlled after mass production. It can be made into an independent power supply module or integrated into the board to power the circuit. It is highly practical and can protect both the power supply and the load, which can effectively reduce the risk of circuit abnormality. It has excellent protection, high power efficiency, strong applicability, and strong portability.

[0009] A preferred solution is that the VIN pin of the first switching regulator is connected to the power input, the SW pin of the first switching regulator is connected to the IN pin of the first electronic fuse, and the OUT pin of the first electronic fuse is connected to the PP_HV pin of the power output.

[0010] A preferred solution is that the VIN pin of the second switching regulator is connected to the power input, the PH pin and BOOT pin of the second switching regulator are connected to the IN pin of the second electronic fuse, and the OUT pin of the second electronic fuse is connected to the PP_HV pin of the power output.

[0011] A preferred solution is that the VIN pin of the third switching regulator is connected to the power input, the SW pin of the third switching regulator is connected to the IN pin of the third electronic fuse, and the OUT pin of the third electronic fuse is connected to the PP_HV pin of the power output.

[0012] A preferred solution is that the power output device for the audio DFU station also includes an I / O expander, a digital-to-analog converter and a storage IC. The I / O expander, the digital-to-analog converter and the storage IC all communicate with the host computer to control the output. The BIT pin of the I / O expander is connected to the corresponding pins of the first switching regulator, the second switching regulator and the third switching regulator. The DAC1 pin of the digital-to-analog converter is connected to the second switching regulator and the second electronic fuse. The DAC2 pin of the digital-to-analog converter is connected to the second switching regulator and the third electronic fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a principle block diagram of the utility model;

[0014] Figure 2 is a circuit schematic diagram of the boost module;

[0015] Figure 3 is a circuit schematic diagram of the first step-down module;

[0016] Figure 4 is a circuit schematic diagram of the second step-down module;

[0017] Figure 5 It is a structural frame diagram of the utility model. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 5 As shown, in this embodiment, the utility model includes a boost module, a first buck module and a second buck module, the boost module includes a first switching regulator U700 and a first electronic fuse U701, the power input 1 flows through the first switching regulator U700 and the first electronic fuse U701 in sequence to the power output 2, and converts 24V to a fixed 27V output; the first buck module includes a second switching regulator U800 and a second electronic fuse U801, the power input 1 flows through the second switching regulator U800 and the second electronic fuse U801 in sequence to the power output 2, and converts 24V to an adjustable output of 5V~15V; the second buck module includes a third switching regulator U900 and a third electronic fuse U901, the power input 1 flows through the third switching regulator U900 and the third electronic fuse U901 in sequence to the power output 2, and converts 24V to an adjustable output of 10~16V.

[0019] The input voltage of these three power supplies all uses the same 24V voltage, including a Boost circuit that converts 24V to a fixed 27V output, a Buck circuit that converts 24V to an adjustable 5V~15V output, and a Buck circuit that converts 24V to an adjustable 10~16V output. All three power outputs are equipped with electronic fuses to protect the power supply and load. When the electronic fuse is working, when the circuit triggers the overcurrent protection, the current of the power supply will be limited to the current limit value set by the electronic fuse. When the electronic fuse is working, when the circuit triggers the OVP / UVLO protection, the voltage output of the power supply will be turned off. The parameters of the OVP / UVLO / current limiting protection of the electronic fuse can be flexibly adjusted according to actual needs.

[0020] like Figure 2 As shown, Figure 1 As shown, in this embodiment, the VIN pin of the first switching regulator U700 is connected to the power input 1, the SW pin of the first switching regulator U700 is connected to the IN pin of the first electronic fuse U701, and the OUT pin of the first electronic fuse U701 is connected to the PP_HV pin of the power output 2. The model of the first switching regulator U700 is TPS55340PWPR, and the model of the first electronic fuse U701 is TPS26400PWPR.

[0021] like Figure 3 As shown, in this embodiment, the VIN pin of the second switching regulator U800 is connected to the power input 1, the PH pin and the BOOT pin of the second switching regulator U800 are connected to the IN pin of the second electronic fuse U801, and the OUT pin of the second electronic fuse U801 is connected to the PP_HV pin of the power output 2. The model of the second switching regulator U800 is TPS5430DDA, and the model of the second electronic fuse U801 is TPS26400PWPR.

[0022] like Figure 4 As shown, in this embodiment, the VIN pin of the third switching regulator U900 is connected to the power input 1, the SW pin of the third switching regulator U900 is connected to the IN pin of the third electronic fuse U901, and the OUT pin of the third electronic fuse U901 is connected to the PP_HV pin of the power output 2. The model of the third switching regulator U900 is TPS560430XFDBVT, and the model of the third electronic fuse U901 is TPS26400PWPR.

[0023] like Figure 1As shown, in this embodiment, the power output device for the audio DFU workstation also includes an I / O expander U1, a digital-to-analog converter U2 and a storage ICU3. The I / O expander U1, the digital-to-analog converter U2 and the storage ICU3 all communicate with the host computer to control the output. The BIT pin of the I / O expander U1 is connected to the corresponding pins of the first switching regulator U700, the second switching regulator and the third switching regulator U900. The DAC1 pin of the digital-to-analog converter U2 is connected to the second switching regulator U800 and the second electronic fuse U801. The DAC2 pin of the digital-to-analog converter U2 is connected to the second switching regulator U800 and the third electronic fuse U901. The adjustment of the power output voltage can be achieved by the output of the digital-to-analog converter U2 acting on the voltage of the FB pin of the power control chip.

Claims

1. A power output device for an audio DFU station, characterized in that: The invention comprises a boost module, a first buck module and a second buck module. The boost module comprises a first switching regulator (U700) and a first electronic fuse (U701). The power input (1) flows sequentially through the first switching regulator (U700), the first electronic fuse (U701) and the power output (2), and converts 24V to a fixed 27V output. The first buck module comprises a second switching regulator (U800) and a second electronic fuse (U801). The power input (1) flows sequentially through the first switching regulator (U700), the first electronic fuse (U701) and the power output (2). The second switching regulator (U800), the second electronic fuse (U801) and the power output (2) are used to convert 24V to an adjustable output of 5V to 15V; the second step-down module comprises a third switching regulator (U900) and a third electronic fuse (U901), and the power input (1) flows through the third switching regulator (U900), the third electronic fuse (U901) and the power output (2) in sequence, and converts 24V to an adjustable output of 10 to 16V.

2. A power output device for an audio DFU station according to claim 1, characterized in that: The VIN pin of the first switching regulator (U700) is connected to the power input (1), the SW pin of the first switching regulator (U700) is connected to the IN pin of the first electronic fuse (U701), and the OUT pin of the first electronic fuse (U701) is connected to the PP_HV pin of the power output (2).

3. A power output device for an audio DFU station according to claim 1, characterized in that: The VIN pin of the second switching regulator (U800) is connected to the power input (1), the PH pin and the BOOT pin of the second switching regulator (U800) are connected to the IN pin of the second electronic fuse (U801), and the OUT pin of the second electronic fuse (U801) is connected to the PP_HV pin of the power output (2).

4. A power output device for an audio DFU station according to claim 1, characterized in that: The VIN pin of the third switching regulator (U900) is connected to the power input (1), the SW pin of the third switching regulator (U900) is connected to the IN pin of the third electronic fuse (U901), and the OUT pin of the third electronic fuse (U901) is connected to the PP_HV pin of the power output (2).

5. A power output device for an audio DFU station according to claim 1, characterized in that: The power output device for the audio DFU workstation also includes an I / O expander (U1), a digital-to-analog converter (U2) and a storage IC (U3). The I / O expander (U1), the digital-to-analog converter (U2) and the storage IC (U3) all communicate with a host computer to control output. The BIT pin of the I / O expander (U1) is connected to the corresponding pins of the first switching regulator (U700), the second switching regulator and the third switching regulator (U900). The DAC1 pin of the digital-to-analog converter (U2) is connected to the second switching regulator (U800) and the second electronic fuse (U801). The DAC2 pin of the digital-to-analog converter (U2) is connected to the second switching regulator (U800) and the third electronic fuse (U901).

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