Voltage bias control circuit and voltage bias control device

By using a voltage bias control circuit and adjusting the current with voltage divider resistors and lead resistors, continuous and accurate voltage adjustment of SSD products is achieved. This solves the problem of inaccurate voltage setting, improves the efficiency and accuracy of voltage adjustment, adapts to different power modules, and avoids product damage.

CN223928234UActive Publication Date: 2026-02-17DONGGUAN YIYUN INFORMATION SYST CO LTD
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Patent Information

Application Number
CN202423116083.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2026-02-17
Estimated Expiration
2034-12-17

AI Technical Summary

Technical Problem

In existing technologies, it is difficult to accurately set the voltage bias of SSD products by replacing the feedback resistor, and the voltage adjustment is discontinuous and has low accuracy.

Method used

A voltage bias control circuit is adopted. Through the sequentially connected control module, DAC voltage output circuit, voltage isolation and stabilization circuit and lead resistor, the voltage divider resistor unit is used to adjust the current to control the DAC voltage output, so as to achieve continuous controllable and accurate voltage adjustment and avoid the need to replace the feedback resistor.

Benefits of technology

It achieves continuous and accurate voltage adjustment, simplifies the operation process, improves driving capability, avoids product damage, adapts to different power modules, and requires no heating.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a voltage bias control circuit which is connected with a power supply module, the power supply module comprises a DC / DC power supply, a first divider resistor unit and a second divider resistor unit, the output end of the DC / DC power supply is connected with the feedback end of the DC / DC power supply through the first divider resistor unit, and the feedback end of the DC / DC power supply is grounded through the second divider resistor unit. The voltage bias control circuit comprises a control module, a DAC (Digital-to-Analog Converter) voltage output circuit, a voltage isolation stabilizing circuit and a lead resistor which are connected in sequence, and the lead resistor is connected with the feedback end of the DC / DC power supply through a lead; and the control module adjusts the current passing through the lead resistor according to the current passing through the first divider resistor unit and the second divider resistor unit so as to adjust the output voltage of the DAC voltage output circuit. The voltage can be adjusted to obtain the required bias voltage without replacing the feedback resistor, the voltage is continuous and controllable, and the accuracy is high. The utility model also provides a voltage bias control device.
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Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, and in particular to a voltage bias control circuit and a voltage bias control device. Background Technology

[0002] In electronic product testing, voltage bias reliability testing is frequently required to ensure that the product can still function normally even when the internal power supply ages and its output accuracy deteriorates. For systems with multiple power supply voltages, voltage bias is typically achieved by replacing the feedback resistor of the power supply, and different resistance values ​​are selected to achieve different fixed positive or negative bias voltages.

[0003] Since most commonly used resistors are non-continuous E24 or E96 series resistors, for SSD (Solid State Disk) products, it is difficult to accurately set the voltage to the required voltage by replacing the feedback resistor to adjust the voltage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a voltage bias control circuit and a voltage bias control device, so as to achieve voltage adjustment to obtain the required bias voltage without replacing the feedback resistor, and the voltage is continuously controllable and highly accurate.

[0005] In a first aspect, this utility model provides a voltage bias control circuit connected to a power supply module. The power supply module includes a DC / DC power supply, a first voltage divider resistor unit, and a second voltage divider resistor unit. The output terminal of the DC / DC power supply is connected to the feedback terminal of the DC / DC power supply through the first voltage divider resistor unit, and the feedback terminal of the DC / DC power supply is grounded through the second voltage divider resistor unit. The voltage bias control circuit includes a control module, a DAC voltage output circuit, a voltage isolation and stabilization circuit, and a lead resistor connected in sequence. The lead resistor is connected to the feedback terminal of the DC / DC power supply through a lead, so that the control module adjusts the current through the lead resistor according to the current through the first voltage divider resistor unit and the second voltage divider resistor unit, thereby adjusting the output voltage of the DAC voltage output circuit.

[0006] Secondly, the present invention also provides a voltage bias control device, including a control circuit board and the aforementioned voltage bias control circuit, wherein the voltage bias control circuit is disposed on the control circuit board.

[0007] The beneficial technical effects of this utility model are as follows: The voltage bias control circuit of this utility model is connected to the power supply module. The voltage bias control circuit sets up a control module, a DAC voltage output circuit, a voltage isolation stabilization circuit, and lead resistors connected in sequence. The control module controls the output voltage of the DAC voltage output circuit, while the voltage isolation stabilization circuit isolates the DAC voltage output circuit and the power supply module, ensuring accurate output voltage of the DAC voltage output circuit, improving driving capability, and adapting to different power supply modules. The lead resistors are used to set the upper and lower limits of voltage bias, which has a voltage regulation function and can avoid overvoltage output. The output terminal of the DC / DC power supply of the power supply module is connected to the feedback terminal of the DC / DC power supply through the first voltage divider resistor unit. The feedback terminal of the DC / DC power supply is grounded through the second voltage divider resistor unit. The control module adjusts the current through the lead resistor according to the current through the first and second voltage divider resistor units to adjust the output voltage of the DAC voltage output circuit. Voltage adjustment can be achieved to obtain the required bias voltage without replacing the feedback resistor. The control operation is convenient and simple, with low workload, high efficiency, and the bias voltage is continuously controllable and highly accurate. No heating is required, avoiding product damage caused by heating. The voltage bias control device of this invention also has the above-mentioned functions. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 A schematic diagram illustrating the specific application of the voltage bias control circuit provided in this embodiment of the utility model;

[0010] Figure 2 A circuit diagram of the voltage bias control circuit provided in this embodiment of the utility model. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0012] Please see Figure 1 and Figure 2 , Figure 1This is a schematic diagram illustrating the specific application of the voltage bias control circuit provided in this embodiment of the present invention. The voltage bias control circuit 10 is connected to the power supply module 20. The power supply module 20 includes a DC / DC power supply 21, a first voltage divider resistor unit 22, and a second voltage divider resistor unit 23. The output terminal OUT of the DC / DC power supply 21 is connected to the feedback terminal FB of the DC / DC power supply 21 through the first voltage divider resistor unit 22. The feedback terminal FB of the DC / DC power supply 21 is grounded through the second voltage divider resistor unit 23. The voltage bias control circuit 10 includes a control module U1, a DAC voltage output circuit 11, a voltage isolation stabilization circuit 12, and a lead resistor R3 connected in sequence. The lead resistor R3 is connected to the feedback terminal FB of the DC / DC power supply 21 through a lead, so that the control module U1 adjusts the current through the lead resistor R3 according to the current through the first voltage divider resistor unit 22 and the second voltage divider resistor unit 23, thereby adjusting the output voltage of the DAC voltage output circuit 11.

[0013] The control module U1 can be an MCU, and the lead resistor R3 can be a fixed or adjustable resistor. The control module U1 can store voltage regulation setting parameters. The control module U1 is connected to the DAC voltage output circuit 11 via an SPI bus to control the output voltage of the DAC voltage output circuit 11. The DAC (Digital-to-Analog Converter) voltage output circuit is used to output an output voltage for modulating the required bias voltage according to the instructions of the control module U1. The voltage isolation and stabilization circuit 12 is used to strengthen the isolation and stabilization of the voltage output by the DAC voltage output circuit 11, so as to make the output voltage more stable and reliable. A voltage divider is formed between the first voltage divider resistor unit 22 and the second voltage divider resistor unit 23. The first voltage divider resistor unit 22, the second voltage divider resistor unit 23 and the lead resistor R3 are all connected to the feedback terminal FB of the DC / DC power supply 21. The first voltage divider resistor unit 22 includes a first voltage divider resistor R1 and the second voltage divider resistor unit 23 includes a second voltage divider resistor R2. The first voltage divider resistor R1, the second voltage divider resistor R2 and the lead resistor R3 form a feedback network to provide a reference level to the feedback terminal FB of the DC / DC power supply 21. The change of the reference level input to the feedback terminal FB of the DC / DC power supply 21 directly affects the final output pull-up voltage. Therefore, the output voltage of the DAC voltage output circuit 11 can be controlled by the control module U1, and then the output voltage of the voltage isolation stabilization circuit 12 can be controlled to adjust the voltage value of the final output pull-up voltage in real time. When the output voltage of the voltage isolation stabilization circuit 12 is equal to the voltage at the feedback terminal FB of the DC / DC power supply 21, the current through the lead resistor R3 is 0, and the final output bias voltage is unaffected, outputting the original set value. At this time, the final output bias voltage can be expressed by formula (1):

[0014]

[0015] In the formula, V out This represents the final output bias voltage, R1 represents the first voltage divider resistor, R2 represents the second voltage divider resistor, and V ref Indicates the reference voltage.

[0016] When the output voltage of the voltage isolation stabilization circuit 12 is not equal to the voltage input to the feedback terminal FB of the DC / DC power supply 21, according to the node current law, the sum of the current through the first voltage divider resistor R1 and the current through the lead resistor R3 is equal to the current through the second voltage divider resistor R2. The relationship between the current through the first voltage divider resistor R1, the current through the lead resistor R3, and the current through the second voltage divider resistor R2 can be expressed by formula (2):

[0017]

[0018] In the formula, V out This represents the final output bias voltage, V. FB This represents the voltage input to the feedback terminal of the DC / DC power supply, V. adj R1 represents the first voltage divider resistor, R2 represents the second voltage divider resistor, and R3 represents the lead resistance. According to formula (1) and formula (2), the output voltage of the voltage isolation stabilization circuit 12 can be calculated by the required final output bias voltage, and then the voltage output of the DAC voltage output circuit 11 that the control module U1 needs to control can be obtained. The lead resistance R3 is set according to the required bias setting range, and the output voltage of the voltage isolation stabilization circuit 12 is automatically and flexibly adjusted by the control module U1 according to the actual test requirements. During operation, the maximum value of the final output bias voltage can be set according to the test requirements. The voltage of the first voltage divider resistor R1, the second voltage divider resistor R2 and the voltage of the feedback terminal FB input to the DC / DC power supply 21 are the fixed parameters of the power supply module 20 under test. The output voltage of the voltage isolation stabilization circuit 12 is controlled to be 0. At this time, the final output bias voltage is the maximum value of the set final output bias voltage, so as to calculate the resistance value of the lead resistance R3.

[0019] The voltage bias control circuit 10 is connected to the power module 20. The voltage bias control circuit 10, through a sequentially connected control module U1, DAC voltage output circuit 11, voltage isolation stabilization circuit 12, and lead resistor R3, controls the output voltage of the DAC voltage output circuit 11 via the control module U1. The voltage isolation stabilization circuit 12 isolates the DAC voltage output circuit 11 from the power module 20, ensuring accurate voltage output from the DAC voltage output circuit 11 and improving driving capability. After connecting the voltage bias control circuit 10 to the power module 20 via leads, voltage bias testing can be performed directly, and the bias voltage can be adjusted as needed to adapt to different power modules 20. The voltage bias is set using the lead resistor R3. The upper and lower limits are controlled, which has a voltage regulation function and can avoid overvoltage output. The output terminal OUT of the DC / DC power supply 21 of the power module 20 is connected to the feedback terminal FB of the DC / DC power supply 21 through the first voltage divider resistor unit 22. The feedback terminal FB of the DC / DC power supply 21 is grounded through the second voltage divider resistor unit 23. The control module U1 adjusts the current through the lead resistor R3 according to the current through the first voltage divider resistor unit 22 and the second voltage divider resistor unit 23 to adjust the output voltage of the DAC voltage output circuit 11. The voltage adjustment can be achieved without replacing the feedback resistor to obtain the required pull-off voltage. The control operation is convenient and simple, with low workload and high efficiency. The pull-off voltage is continuously controllable and accurate. No heating is required, avoiding product damage caused by heating.

[0020] Specifically, the DAC voltage output circuit 11 includes a DAC chip U2, which is connected to the control module U1 and the voltage isolation stabilization circuit 12 respectively, so as to output the required output voltage to the voltage isolation stabilization circuit 12 according to the control of the control module U1.

[0021] Preferably, the DAC chip U2 is a digital-to-analog converter chip with model number DAC9881.

[0022] Specifically, the voltage isolation stabilization circuit 12 includes an operational amplifier U3. The output terminal of the DAC voltage output circuit 11 is connected to the non-inverting input terminal of the operational amplifier U3, the inverting input terminal of the operational amplifier U3 is connected to the output terminal of the operational amplifier U3, and the output terminal of the operational amplifier U3 is connected to the lead resistor R3. Preferably, the inverting input terminal of the operational amplifier U3 is connected to the output terminal of the operational amplifier U3 through a fifth resistor R5.

[0023] Specifically, the non-inverting input terminal of the operational amplifier U3 is grounded through a fourth resistor R4. One end of the fourth resistor R4 is grounded, and the other end of the fourth resistor R4 is connected to the non-inverting input terminal of the operational amplifier U3 and the voltage output terminal of the DAC chip U2, respectively.

[0024] Specifically, in this embodiment, the positive voltage terminal of the operational amplifier U3 is connected to the first supply voltage, and the negative voltage terminal of the operational amplifier U3 is grounded. The first supply voltage is a voltage with a value of 5V.

[0025] The voltage bias control device of this utility model includes a control circuit board and the voltage bias control circuit described above, wherein the voltage bias control circuit is disposed on the control circuit board.

[0026] In summary, the voltage bias control circuit of this invention is connected to the power supply module. The voltage bias control circuit, through the sequential connection of a control module, a DAC voltage output circuit, a voltage isolation stabilization circuit, and lead resistors, controls the output voltage of the DAC voltage output circuit via the control module. The voltage isolation stabilization circuit isolates the DAC voltage output circuit from the power supply module, ensuring accurate output voltage from the DAC voltage output circuit, improving driving capability, and adapting to different power supply modules. The lead resistors set the upper and lower limits of the voltage bias, providing voltage regulation and preventing overvoltage output. The output terminal of the DC / DC power supply of the power supply module is connected to the feedback terminal of the DC / DC power supply through a first voltage divider resistor unit. The feedback terminal of the DC / DC power supply is grounded through a second voltage divider resistor unit. The control module adjusts the current through the lead resistors based on the current through the first and second voltage divider resistor units, thereby adjusting the output voltage of the DAC voltage output circuit. Voltage adjustment to obtain the required bias voltage can be achieved without replacing the feedback resistor. The control operation is convenient and simple, with low workload, high efficiency, and continuously controllable bias voltage with high accuracy. No heating is required, avoiding product damage caused by heating. The voltage bias control device of this invention also has the above-mentioned functions.

[0027] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A voltage bias control circuit, characterized in that, The circuit is connected to a power supply module, which includes a DC / DC power supply, a first voltage divider resistor unit, and a second voltage divider resistor unit. The output terminal of the DC / DC power supply is connected to the feedback terminal of the DC / DC power supply through the first voltage divider resistor unit, and the feedback terminal of the DC / DC power supply is grounded through the second voltage divider resistor unit. The voltage bias control circuit includes a control module, a DAC voltage output circuit, a voltage isolation stabilization circuit, and a lead resistor connected in sequence. The lead resistor is connected to the feedback terminal of the DC / DC power supply through a lead, so that the control module adjusts the current through the lead resistor according to the current through the first voltage divider resistor unit and the second voltage divider resistor unit, thereby adjusting the output voltage of the DAC voltage output circuit.

2. The voltage bias control circuit according to claim 1, characterized in that, The DAC voltage output circuit includes a DAC chip, which is connected to the control module and the voltage isolation stabilization circuit respectively, so as to output the required output voltage to the voltage isolation stabilization circuit according to the control of the control module.

3. The voltage bias control circuit according to claim 2, characterized in that, The DAC chip is a digital-to-analog converter chip with the model number DAC9881.

4. The voltage bias control circuit according to claim 1, characterized in that, The voltage isolation stabilization circuit includes an operational amplifier. The output terminal of the DAC voltage output circuit is connected to the non-inverting input terminal of the operational amplifier, the inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the lead resistor.

5. The voltage bias control circuit according to claim 4, characterized in that, The non-inverting input of the operational amplifier is grounded through a fourth resistor.

6. The voltage bias control circuit according to claim 4, characterized in that, The inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier through a fifth resistor.

7. The voltage bias control circuit according to claim 4, characterized in that, The positive voltage terminal of the operational amplifier is connected to the first supply voltage, and the negative voltage terminal of the operational amplifier is grounded.

8. A voltage bias control device, characterized in that, It includes a control circuit board and a voltage bias control circuit as described in any one of claims 1 to 7, wherein the voltage bias control circuit is disposed on the control circuit board.