Power supply device, power supply test system and electronic equipment

Abstract

The utility model discloses a power supply device, a power supply test system and an electronic device, the power supply device comprises a control panel, the control panel is provided with an MCU, a DAC module, an ADC module and a reference voltage source, the signal output end of the MCU is connected with the input end of the DAC module, the signal input end of the MCU is connected with the output end of the ADC module, and the reference voltage source is respectively connected with the reference input end of the DAC module and the reference input end of the ADC module; the power board and the control board are arranged at intervals, a driving module, a power module and a sampling circuit are arranged on the power board, the output end of the DAC module is connected with the input end of the driving module, the output end of the driving module is connected with the control end of the power module, and the sampling circuit is used for obtaining current and voltage of the power board. The output end of the sampling circuit is connected with the input end of the ADC module. The influence of heating of the power module on the reference voltage source is reduced, and the precision of the power supply device is improved.

Description

Technical Field

[0001] The utility model relates to the field of power supply devices, and particularly relates to a power supply device, a power supply test system and an electronic device. Background Art

[0002] The power supply device controls the conversion of electric power through high-speed switching transistors, and is commonly used to adjust voltage and current to meet the requirements of different electronic devices. In the existing power supply device, the MCU outputs a control signal through the DAC module to control the power module, and samples the voltage / current of the power supply device through the ADC module.

[0003] In the power supply device, both the DAC module and the ADC module require a reference voltage to work properly. When the switching transistor is working, a large amount of heat will be generated, which will affect the accuracy of the reference voltage and further affect the accuracy of the power supply device.

[0004] In summary, due to the heat generated by the switching transistor in the power module of the existing power supply device, which affects the accuracy of the reference voltage, the accuracy of the power supply device is low. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a power supply device, a power supply test system and an electronic device, which can improve the accuracy of the power supply device.

[0006] The power supply device according to the first aspect embodiment of the utility model includes: a control board, on which an MCU, a DAC module, an ADC module and a reference voltage source are arranged. The signal output end of the MCU is connected to the input end of the DAC module, the signal input end of the MCU is connected to the output end of the ADC module, and the reference voltage source is respectively connected to the reference input ends of the DAC module and the ADC module; a power board, on which a driving module, a power module and a sampling circuit are arranged. The output end of the DAC module is connected to the input end of the driving module, the output end of the driving module is connected to the control end of the power module, the sampling circuit is used to obtain the current and voltage of the power board, and the output end of the sampling circuit is connected to the input end of the ADC module.

[0007] According to some embodiments of the utility model, a first single-ended to differential module is further arranged on the control board, and a differential to single-ended module is further arranged on the power board. The output end of the DAC module is connected to the input end of the first single-ended to differential module, the first single-ended to differential module is connected to the input end of the differential to single-ended module, and the output end of the differential to single-ended module is connected to the input end of the driving module.

[0008] According to some embodiments of the present utility model, the first single-ended to differential module includes an operational amplifier U1 and a differential amplifier U2. The output end of the DAC module is connected to the non-inverting input end of the operational amplifier U1. The inverting input end of the operational amplifier U1 is grounded through a resistor R2 and a resistor R1 connected in series in sequence. The output end of the operational amplifier U1 is connected to the non-inverting input end of the differential amplifier U2 through a resistor R3. The inverting input end of the differential amplifier U2 is grounded through the resistor R1. The output end of the differential amplifier U2 is connected to the input end of the differential to single-ended module.

[0009] According to some embodiments of the present utility model, a second single-ended to differential module is provided on the power board. The output end of the sampling circuit is connected to the input end of the second single-ended to differential module. The output end of the second single-ended to differential module is connected to the input end of the ADC module.

[0010] According to some embodiments of the present utility model, the second single-ended to differential module includes an operational amplifier U5 and a differential amplifier U6. The output end of the sampling circuit is connected to the non-inverting input end of the operational amplifier U5. The inverting input end of the operational amplifier U5 is grounded through a resistor R9 and a resistor R10 connected in series in sequence. The output end of the operational amplifier U5 is connected to the non-inverting input end of the differential amplifier U6 through a resistor R12. The inverting input end of the differential amplifier U6 is grounded through the resistor R10. The output end of the differential amplifier U6 is connected to the input end of the ADC module.

[0011] According to some embodiments of the present utility model, the driving module includes a closed-loop control module and a PWM modulator. The output end of the DAC module is connected to the input end of the closed-loop control module. The sampling circuit is connected to the feedback end of the closed-loop control module. The output end of the closed-loop control module is connected to the input end of the PWM modulator. The output end of the PWM modulator is connected to the control end of the power module.

[0012] According to some embodiments of the present utility model, the closed-loop control module is one or more of a current control loop, a voltage control loop, or a power control loop.

[0013] The power supply test system according to the second aspect embodiment of the present utility model includes the above-mentioned power supply device.

[0014] The electronic device according to the third aspect embodiment of the present utility model includes the above-mentioned power supply device.

[0015] The power supply device, power supply test system, and electronic device according to the embodiments of the present utility model at least have the following beneficial effects:

[0016] In this embodiment, the power supply device is divided into two PCB boards, namely a control board and a power board. The MCU, DAC module, ADC module, and reference voltage source are located on the control board, while the power module and related circuits are arranged on the power board. The power board and the control board are spaced apart. Therefore, the MCU, DAC module, ADC module, and reference voltage source can maintain a certain distance from the power module on the power board, reducing the impact of the heat generated by the power module on the reference voltage source and improving the accuracy of the power supply device.

[0017] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0018] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0019] Figure 1 is the principle block diagram of the power supply device in the embodiment of the present application;

[0020] Figure 2 is the circuit schematic diagram of the control board in the power supply device;

[0021] Figure 3 is the circuit schematic diagram of the power board in the power supply device. Specific Embodiments

[0022] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc., is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0024] In the description of the present utility model, "a plurality" means more than two. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0025] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0026] Referring to Figure 1 As shown, a power supply device includes: a control board and a power board, and the power board is arranged at an interval from the control board. Among them, an MCU, a DAC module, an ADC module, and a reference voltage source are arranged on the control board. The signal output end of the MCU is connected to the input end of the DAC module, the signal input end of the MCU is connected to the output end of the ADC module, and the reference voltage source is respectively connected to the reference input ends of the DAC module and the ADC module. A drive module, a power module, and a sampling circuit are arranged on the power board. The output end of the DAC module is connected to the input end of the drive module, the output end of the drive module is connected to the control end of the power module, and the sampling circuit is used to obtain the current and voltage of the power board. The output end of the sampling circuit is connected to the input end of the ADC module.

[0027] In this embodiment, the power supply device is divided into two PCB boards, namely a control board and a power board. The MCU, DAC module, ADC module, and reference voltage source are located on the control board, and the power module and related circuits are arranged on the power board. The power board is arranged at an interval from the control board. Therefore, the MCU, DAC module, ADC module, and reference voltage source can keep a certain distance from the power module on the power board, reducing the influence of the heat generated by the power module on the reference voltage source and improving the accuracy of the power supply device.

[0028] In this embodiment, the power board is arranged at an interval from the control board, which means that there is a certain distance between the power board and the control board. Therefore, the MCU, DAC module, ADC module, and reference voltage source on the control board can keep a certain distance from the power board, reducing the influence of the heat generated by the switching tube in the power module. The power board and the control board are connected by a communication line.

[0029] In this embodiment, the MCU outputs an analog control signal through the DAC module. The analog control signal enters the drive module on the power board through the communication line. The drive module controls the MOS tube in the power module to achieve the control of the output voltage and current. The sampling circuit samples the output voltage / current of the power module, and then feeds the sampling value back to the ADC module through the signal line. The ADC module converts the sampling value into a digital signal and feeds it back to the MCU. The MCU can display the real-time sampling values of the current and voltage through a display or feed them back to the host computer through a communication port.

[0030] In this embodiment, the sampling circuit is an instrumentation amplifier U4, which collects the output current of the power module through a sampling resistor, or can directly sample the output voltage of the power module.

[0031] In some embodiments of the present application, a first single-ended to differential module is further provided on the control board, and a differential to single-ended module is further provided on the power board. The output end of the DAC module is connected to the input end of the first single-ended to differential module, the first single-ended to differential module is connected to the input end of the differential to single-ended module, and the output end of the differential to single-ended module is connected to the input end of the drive module.

[0032] In this embodiment, a first single-ended to differential module is provided on the control board, and a differential to single-ended module is also provided on the power board. The control board transmits the analog signal to the power board in the form of differential signal transmission, effectively increasing the anti-interference ability and suppressing the influence of the high-frequency MOS tube in the power module on the analog signal, and achieving good effect of long-distance signal transmission.

[0033] It should be noted that due to the frequent switching of the MOS tube in the power module during the operation of the power supply device, there are a large number of high-frequency noises, which will interfere with analog signals such as voltage and current and cause influence, thus reducing the power supply accuracy. Therefore, in the embodiments of the present application, the analog signal output by the DAC module is first converted into a differential signal by the first single-ended to differential module on the control board, and the differential signal is sent to the power board, and then the differential to single-ended module on the power board converts the input differential signal into a single-ended signal.

[0034] It should be noted that in the embodiments of the present application, the first single-ended to differential module can adopt a differential amplifier, and the differential to single-ended module can adopt an operational amplifier.

[0035] In some embodiments of the present application, refer to Figure 2 shown and Figure 3 shown, the first single-ended to differential module includes an operational amplifier U1 and a differential amplifier U2. The output end of the DAC module is connected to the non-inverting end of the operational amplifier U1. The inverting end of the operational amplifier U1 is grounded through a resistor R2 and a resistor R1 connected in series in sequence. The output end of the operational amplifier U1 is connected to the non-inverting end of the differential amplifier U2 through a resistor R3. The inverting end of the differential amplifier U2 is grounded through a resistor R1, and the output end of the differential amplifier U2 is connected to the input end of the differential to single-ended module.

[0036] In this embodiment, the first single-ended to differential module is formed by the operational amplifier U1 and the differential amplifier U2, which can achieve high input impedance, low offset voltage and low offset voltage drift, and further improve the power supply accuracy.

[0037] It should be noted that although directly connecting the output terminal of the DAC module to the differential amplifier U2 can also convert the single-ended signal into a differential signal, using the differential amplifier U2 alone has the defects of low input impedance, high offset voltage, and high offset voltage drift. Therefore, in this embodiment, an operational amplifier U1 is provided before the differential amplifier U2, and the operational amplifier U1 and the differential amplifier U2 are combined to form a first single-ended to differential module, which can achieve high input impedance, low offset voltage, and low offset voltage drift.

[0038] Among them, the VCOM terminal of the differential amplifier U2 is connected to the common-mode voltage of the differential signal, and half of the reference reference voltage is selected.

[0039] In some embodiments of the present application, a second single-ended to differential module is provided on the power board. The output terminal of the sampling circuit is connected to the input terminal of the second single-ended to differential module, and the output terminal of the second single-ended to differential module is connected to the input terminal of the ADC module.

[0040] In this embodiment, a second single-ended to differential module is provided on the power board, so that the power board transmits the analog signal to the control board in the form of differential signal transmission, effectively increasing the anti-interference ability, suppressing the influence of the high-frequency MOS tube in the power module on the analog signal, and having a good effect on long-distance signal transmission.

[0041] It should be noted that due to the frequent switching of the MOS tube in the power module when the power supply device is working, there are a large number of high-frequency noises, which will interfere with analog signals such as voltage and current, thereby reducing the power supply accuracy. Therefore, in the embodiments of the present application, the analog signal output by the sampling circuit is first converted into a differential signal by the second single-ended to differential module of the power board, and the differential signal is sent to the ADC module on the control board.

[0042] In some embodiments of the present application, referring to Figure 3 As shown, the second single-ended to differential module includes an operational amplifier U5 and a differential amplifier U6. The output terminal of the sampling circuit is connected to the non-inverting terminal of the operational amplifier U5. The inverting terminal of the operational amplifier U5 is grounded through a resistor R9 and a resistor R10 connected in series. The output terminal of the operational amplifier U5 is connected to the non-inverting terminal of the differential amplifier U6 through a resistor R12. The inverting terminal of the differential amplifier U6 is grounded through a resistor R10, and the output terminal of the differential amplifier U6 is connected to the input terminal of the ADC module.

[0043] In this embodiment, the operational amplifier U5 and the differential amplifier U6 are used to form a second single-ended to differential module, which can achieve high input impedance, low offset voltage, and low offset voltage drift, and further improve the power supply accuracy.

[0044] It should be noted that although directly connecting the output terminal of the sampling circuit to the differential amplifier U6 can also convert the single-ended signal into a differential signal, using the differential amplifier U6 alone has the defects of low input impedance, high offset voltage, and high offset voltage drift. Therefore, in this embodiment, an operational amplifier U5 is provided before the differential amplifier U6, and the operational amplifier U5 and the differential amplifier U6 are combined to form a first single-ended to differential module, which can achieve high input impedance, low offset voltage, and low offset voltage drift.

[0045] In some embodiments of the present application, the drive module includes a closed-loop control module and a PWM modulator. The output terminal of the DAC module is connected to the input terminal of the closed-loop control module, the sampling circuit is connected to the feedback terminal of the closed-loop control module, the output terminal of the closed-loop control module is connected to the input terminal of the PWM modulator, and the output terminal of the PWM modulator is connected to the control terminal of the power module.

[0046] In this embodiment, the closed-loop control module generates a closed-loop control signal according to the control signal output by the DAC module and the feedback signal output by the sampling circuit, and inputs it into the PWM modulator to generate a corresponding PWM wave to control the on and off of the MOS transistor in the power module. It can realize the closed-loop control of the power supply device and improve the stability of the output.

[0047] Taking the current control loop as an example, the closed-loop control module includes a subtractor, a PI error amplifier, and a current closed-loop controller. The subtractor subtracts the control value output by the DAC module from the feedback value of the sampling circuit, sends it to the PI for error amplification, the output of the PI is sent to the current closed-loop controller, and then drives the corresponding MOS transistor through the PWM modulator.

[0048] In some embodiments of the present application, the closed-loop control module is one or more of a current control loop, a voltage control loop, or a power control loop.

[0049] In this embodiment, by selecting different closed-loop control modules to achieve closed-loop control of current, voltage, or power, the functionality of the power supply device can be improved to adapt to different application scenarios.

[0050] In summary, in the present application, the power board and the control board are separately arranged to reduce the thermal interference of the power module on the reference voltage source; a long-distance differential pair trace is used between the power board and the control board to improve the signal anti-interference ability; a single-ended to differential module is formed by an operational amplifier and a differential amplifier, which solves the problems of low input impedance and high offset voltage of using a differential operational amplifier alone.

[0051] The present application also relates to a power supply test system, including the power supply device of the above embodiment.

[0052] The present application also relates to an electronic device, including the power supply device of the above embodiment.

[0053] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A power supply device, characterized in that, Comprising: A control board, on which an MCU, a DAC module, an ADC module and a reference voltage source are arranged. The signal output end of the MCU is connected to the input end of the DAC module, the signal input end of the MCU is connected to the output end of the ADC module, and the reference voltage source is respectively connected to the reference input ends of the DAC module and the ADC module; A power board, which is arranged at an interval from the control board. A drive module, a power module and a sampling circuit are arranged on the power board. The output end of the DAC module is connected to the input end of the drive module, the output end of the drive module is connected to the control end of the power module, the sampling circuit is used to acquire the current and voltage of the power board, and the output end of the sampling circuit is connected to the input end of the ADC module.

2. The power supply device according to claim 1, characterized in that, A first single-ended to differential module is further arranged on the control board, and a differential to single-ended module is further arranged on the power board. The output end of the DAC module is connected to the input end of the first single-ended to differential module, the first single-ended to differential module is connected to the input end of the differential to single-ended module, and the output end of the differential to single-ended module is connected to the input end of the drive module.

3. The power supply device according to claim 2, characterized in that, The first single-ended to differential module includes an operational amplifier U1 and a differential amplifier U2. The output end of the DAC module is connected to the non-inverting end of the operational amplifier U1. The inverting end of the operational amplifier U1 is grounded through a resistor R2 and a resistor R1 in series. The output end of the operational amplifier U1 is connected to the non-inverting end of the differential amplifier U2 through a resistor R3. The inverting end of the differential amplifier U2 is grounded through the resistor R1, and the output end of the differential amplifier U2 is connected to the input end of the differential to single-ended module.

4. The power supply device according to claim 1, characterized in that, A second single-ended to differential module is arranged on the power board. The output end of the sampling circuit is connected to the input end of the second single-ended to differential module, and the output end of the second single-ended to differential module is connected to the input end of the ADC module.

5. The power supply device according to claim 4, characterized in that, The second single-ended to differential module includes an operational amplifier U5 and a differential amplifier U6. The output end of the sampling circuit is connected to the non-inverting end of the operational amplifier U5. The inverting end of the operational amplifier U5 is grounded through a resistor R9 and a resistor R10 in series. The output end of the operational amplifier U5 is connected to the non-inverting end of the differential amplifier U6 through a resistor R12. The inverting end of the differential amplifier U6 is grounded through the resistor R10, and the output end of the differential amplifier U6 is connected to the input end of the ADC module.

6. The power supply device according to claim 1, characterized in that, The drive module includes a closed-loop control module and a PWM modulator. The output end of the DAC module is connected to the input end of the closed-loop control module, the sampling circuit is connected to the feedback end of the closed-loop control module, the output end of the closed-loop control module is connected to the input end of the PWM modulator, and the output end of the PWM modulator is connected to the control end of the power module.

7. The power supply device according to claim 6, characterized in that The closed-loop control module is one or more of a current control loop, a voltage control loop or a power control loop.

8. A power supply testing system, characterized in that, Including the power supply device according to any one of claims 1 to 7.

9. An electronic device, characterized in that, The power supply device according to any one of claims 1 to 7 is included.

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