Peripheral circuits and control methods of analog-to-digital converters, signal processing equipment

Abstract

This invention discloses a peripheral circuit for an analog-to-digital converter (ADC), its control method, and a signal processing device. The peripheral circuit includes a voltage divider control circuit and a load branch connected to the first current output terminal of the ADC. The load branch includes a first voltage divider resistor and a first switching device connected in series. The first switching device is connected to the control signal output terminal of the ADC and is used to turn on or off according to a first control signal from the control signal output terminal. The voltage divider control circuit is connected across the first voltage divider resistor and is used to connect the first voltage divider resistor to the load branch or short-circuit it according to the load voltage of the load connected to the load branch. The peripheral circuit of the ADC provided by this invention can control whether the first voltage divider resistor is connected to the load branch according to the load voltage, thereby avoiding heat concentration on the first switching device on the load branch and improving the overall stability and reliability of the circuit operation.

Description

Technical Field

[0001] This invention relates to the field of analog-to-digital converter technology, and more particularly to a peripheral circuit and control method for an analog-to-digital converter, as well as a signal processing device. Background Technology

[0002] Analog-to-digital converters (ADCs) are widely used in various electronic devices due to their advantages such as fast conversion speed, high accuracy, and low cost.

[0003] Analog-to-digital converters (ADCs) require suitable peripheral circuitry for proper operation. However, existing ADCs typically use transistors for auxiliary heat dissipation. Under prolonged operation, these transistors can overheat significantly, failing to meet the heat dissipation requirements for long-term stable operation. This problem is particularly severe when driving small load resistors, exacerbating the transistor overheating issue and significantly impacting the stability and reliability of the device, thus failing to meet the heat dissipation needs for continuous long-term operation.

[0004] The problems of excessive heat generation and lack of stability in the peripheral circuits of existing analog-to-digital converters have become urgent technical issues that need to be addressed in the industry. Summary of the Invention

[0005] This invention provides a peripheral circuit and control method for an analog-to-digital converter, as well as a signal processing device, to solve the problems of severe overheating and lack of stability in the peripheral circuits of existing analog-to-digital converters.

[0006] According to one aspect of the present invention, a peripheral circuit for an analog-to-digital converter is provided, comprising: a voltage divider control circuit and a load branch connected to a first current output terminal of the analog-to-digital converter; The load branch includes a first voltage divider resistor and a first switching device connected in series. The first switching device is connected to the control signal output terminal of the analog-to-digital converter and is used to turn on or off according to the first control signal of the control signal output terminal. The voltage divider control circuit is connected across the first voltage divider resistor and is used to connect the first voltage divider resistor to the load branch or short-circuit the first voltage divider resistor according to the load voltage of the load connected to the load branch.

[0007] Optionally, the voltage divider control circuit includes a switch control module and a second switch device; The first input terminal of the switch control module is connected to the second current output terminal of the analog-to-digital converter to receive the reference voltage corresponding to the output current of the second current output terminal. The second input terminal of the switch control module is connected to the load. The switch control module is used to generate a second control signal based on the load voltage and the reference voltage; The control terminal of the second switching device is connected to the output terminal of the switch control module, and the second switching device is connected in parallel across the first voltage divider resistor; the second switching device is used to turn on and off under the control of the second control signal.

[0008] Optionally, the switch control module includes a voltage acquisition unit and a voltage comparison unit; The first input terminal of the voltage acquisition unit serves as the second input terminal of the switch control module and is connected to the load. The second input terminal of the voltage acquisition unit is connected to the second input terminal of the voltage comparison unit, and the output terminal of the voltage acquisition unit is connected to the second input terminal of the voltage comparison unit. The voltage acquisition unit is used to acquire the load voltage. The first input terminal of the voltage comparison unit serves as the first input terminal of the switch control module and is connected to the second current output terminal of the analog-to-digital converter. The output terminal of the voltage comparison unit serves as the output terminal of the switch control module and is connected to the control terminal of the second switching device. The voltage comparison unit is used to generate the second switch control signal based on the load voltage and the reference voltage.

[0009] Optionally, the switch control module further includes a second resistor and a third resistor; The first end of the second resistor is connected to the output terminal of the voltage acquisition unit, and the second end of the second resistor is connected to the second input terminal of the voltage comparison unit. The first end of the third resistor is connected to the second input end of the voltage comparison unit, and the second end of the third resistor is grounded.

[0010] Optionally, the load branch may further include a fourth resistor; The first end of the fourth resistor is connected to the second end of the first switching device, the first end of the first switching device is connected to the first voltage divider resistor, and the second end of the fourth resistor is connected to the load.

[0011] Optionally, the peripheral circuit of the analog-to-digital converter may further include a fifth resistor and a first capacitor; The first end of the fifth resistor is connected to the control terminal of the first switching device, and the second end of the fifth resistor is connected to the load. The first terminal of the first capacitor is connected to the control terminal of the first switching device, and the second terminal of the first capacitor is grounded.

[0012] Optionally, the peripheral circuit of the analog-to-digital converter may further include a sixth resistor; The first end of the sixth resistor is connected to the second current output terminal of the analog-to-digital converter, and the second end of the sixth resistor is grounded; the first end of the sixth resistor is used to provide the reference voltage to the first input terminal of the switch control module.

[0013] Optionally, the resistance value of the first resistor is greater than the resistance value of the fourth resistor.

[0014] According to another aspect of the present invention, a control method for the peripheral circuit of an analog-to-digital converter is provided, for controlling the peripheral circuit of the analog-to-digital converter described in any of the above embodiments, the control method comprising: Obtain the load voltage and the reference voltage; When the load voltage is less than or equal to the reference voltage, the first voltage divider resistor is controlled to be connected to the load branch; When the load voltage is greater than the reference voltage, the first voltage divider resistor is controlled to be short-circuited.

[0015] According to another aspect of the present invention, a signal processing device is provided, including an analog-to-digital converter and peripheral circuitry of the analog-to-digital converter as described in any of the above embodiments.

[0016] The technical solution of this invention involves setting up a voltage divider control circuit and a load branch connected to the first current output terminal of the analog-to-digital converter. The load branch includes a first voltage divider resistor and a second switching device. The voltage divider control circuit can control the state of the first voltage divider resistor according to the load voltage. When the load voltage is low, the first voltage divider resistor is connected to the voltage divider branch; when the load voltage is high, the first voltage divider resistor is short-circuited. By controlling whether the first voltage divider resistor is connected to the load branch based on the load voltage, when the first voltage divider resistor is connected, voltage division and heat dissipation are achieved using the first voltage divider resistor and the first switching device. This effectively avoids heat concentration on the first switching device on the load branch, preventing excessive heat accumulation on the first switching device and improving the overall stability and reliability of the equipment.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the peripheral circuit of an analog-to-digital converter provided in an embodiment of the present invention; Figure 2 A schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention; Figure 3 A schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention; Figure 4 A schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention; Figure 5 A schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention; Figure 6 A flowchart illustrating a control method for the peripheral circuit of an analog-to-digital converter provided in an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] Figure 1 This is a schematic diagram of the peripheral circuit of an analog-to-digital converter provided in an embodiment of the present invention. See also... Figure 1The peripheral circuit 100 of the analog-to-digital converter includes: a voltage divider control circuit 10 and a load branch 20 connected to the first current output terminal 210 of the analog-to-digital converter 200; the load branch 20 includes a first voltage divider resistor R1 and a first switching device 21 connected in series, the first switching device 21 being connected to the control signal output terminal 220 of the analog-to-digital converter 200, and used to turn on or off according to the first control signal of the control signal output terminal 220; the voltage divider control circuit 10 is connected across the first voltage divider resistor R1, and used to connect the first voltage divider resistor R1 to the load branch 20 or short-circuit the first voltage divider resistor R1 according to the load voltage of the load 300 connected to the load branch 20.

[0023] Specifically, as described in the background section, existing analog-to-digital converters (ADCs) typically use transistors for heat dissipation in their peripheral circuits. However, when driving loads with low resistance, the transistors experience significant temperature increases, failing to meet the heat dissipation requirements for long-term stable operation and becoming a core bottleneck in the existing technology. The peripheral circuit 100 of the ADC provided in this embodiment includes a voltage divider control circuit 10 and a load branch 20. One end of the load branch 20 is connected to the first current output terminal 210 of the ADC 200, and the second end of the load branch 20 is connected to the first terminal of the load 300. The second terminal of the load 300 can be connected to the ground terminal 240 of the ADC 200. The load branch 20 includes a first voltage divider resistor R1 and a first switching device 21 connected in series. The first end of the first voltage divider resistor R1 is connected to the first current output terminal 210 of the ADC 200, and the second end of the first voltage divider resistor R1 is connected to the input terminal of the first switching device 21. The control terminal of the first switching device 21 is connected to the control signal output terminal 220 of the ADC 200. The output terminal of the first switching device 21 is connected to the load 300. The first switching device 21 can be a transistor, and the first voltage divider resistor R1 can be in a large package so that the first voltage divider resistor R1 can dissipate heat quickly.

[0024] Specifically, the first current output terminal 210 of the analog-to-digital converter 200 is used to output the drive current for driving the load 300, the control signal output terminal 220 of the analog-to-digital converter 200 is used to output the first control signal, and the ground terminal 240 of the analog-to-digital converter 200 is used to provide a ground signal. The first control signal is used to control the on and off of the first switching device 21. The first and second terminals of the voltage divider control circuit 10 are respectively connected to the two ends of the first voltage divider resistor R1, the third terminal of the voltage divider control circuit 10 is connected to the second current output terminal 220 of the analog-to-digital converter 200, and the fourth terminal of the voltage divider control circuit 10 is connected to the first terminal of the load 300. The voltage divider control circuit 10 can control the conduction state of the first voltage divider resistor R1 according to the magnitude of the load voltage of the load 300. In some embodiments, when the load voltage of load 300 is less than or equal to a preset voltage, to avoid excessive heat generation in the first switching device 22, the voltage divider control circuit 10 controls the first voltage divider resistor R1 to be connected to the voltage divider branch 20. Voltage division is achieved through the first voltage divider resistor R1, preventing heat concentration in the first switching device 21. In other embodiments, when the load voltage of load 300 is greater than the preset voltage, the voltage divider control circuit 10 controls the first voltage divider resistor R1 to be short-circuited. The drive current output from the first current output terminal 210 of the analog-to-digital converter 200 flows into the load 300 through the voltage divider control circuit 10 and the first switching device 21. The preset voltage is not specifically limited in this embodiment and can be set according to actual needs. For example, the preset voltage can be provided by the second current output terminal 220 of the analog-to-digital converter 200. This embodiment effectively avoids excessive heat generation in the first switching device 21 by controlling the state of the first voltage divider resistor R1 according to the load voltage of load 300 through the voltage divider control module 10.

[0025] The peripheral circuit of the analog-to-digital converter provided in this embodiment of the invention includes a voltage divider control circuit and a load branch connected to the first current output terminal of the analog-to-digital converter. The load branch includes a first voltage divider resistor and a second switching device. The voltage divider control circuit can control the state of the first voltage divider resistor according to the load voltage. When the load voltage is low, the first voltage divider resistor is connected to the voltage divider branch; when the load voltage is high, the first voltage divider resistor is short-circuited. By controlling whether the first voltage divider resistor is connected to the load branch according to the load voltage, when the first voltage divider resistor is connected, voltage division and heat dissipation are achieved using the first voltage divider resistor and the first switching device. This effectively avoids heat concentration on the first switching device on the load branch, preventing excessive heat accumulation on the first switching device and improving the overall stability and reliability of the device.

[0026] Optional, Figure 2 This is a schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 2The voltage divider control circuit 10 includes a switch control module 11 and a second switch device 12. The first input terminal of the switch control module 11 is connected to the second current output terminal 230 of the analog-to-digital converter 200 to receive a reference voltage corresponding to the output current of the second current output terminal 230. The second input terminal of the switch control module 11 is connected to the load 300. The switch control module 11 is used to generate a second control signal based on the load voltage and the reference voltage. The control terminal of the second switch device 12 is connected to the output terminal of the switch control module 11. The second switch device 12 is connected in parallel across the first voltage divider resistor R1. The second switch device 12 is used to turn on and off under the control of the second control signal.

[0027] Specifically, the voltage divider control circuit 10 is mainly used to control whether the first voltage divider resistor R1 is connected to the load branch 20 according to the load voltage of the load 300. The voltage divider control unit 10 may include a switch control module 11 and a second switch device 12. The first input terminal of the switch control module 11 is connected to the second current output terminal 230 of the analog-to-digital converter 200, and the second input terminal of the switch control module 11 is connected to one end of the load 300. The second current output terminal 230 of the analog-to-digital converter 200 can output an output current related to the output current of the first current output terminal 210, wherein the output current of the second current output terminal 230 of the analog-to-digital converter 200 is less than the output current of the first current output terminal 210, and is positively correlated with the output current of the first current output terminal 210 of the analog-to-digital converter 200. The first input terminal of the switch control module 11 can receive a reference voltage corresponding to the output current output by the second current output terminal 230 of the analog-to-digital converter 200, and the second input terminal can receive the load voltage corresponding to the load 300. The reference voltage is not specifically limited in this embodiment of the invention and can be set according to actual needs. For example, the reference voltage can be 50% of the maximum load voltage, and correspondingly, the current output by the second current output terminal 230 is the current corresponding to 50% of the maximum load voltage.

[0028] The switch control module 11 can output a second control signal based on the relationship between the load voltage and the reference voltage. The control terminal of the second switching device 12 is connected to the output terminal of the switch control module 11. The second switching device 12 is connected in parallel across the first voltage divider resistor R1. The second control signal can control the on and off states of the second switching device 12. The second switching device 12 can be a MOSFET. For example, when the load voltage is greater than the reference voltage, the second control signal output by the switch control module 11 can be a first-level signal, controlling the second switching device 12 to turn on. The current output from the first current output terminal 210 of the analog-to-digital converter 200 is then delivered to the load 300 after passing through the second switching device 12 and the first switching device 21. When the load voltage is less than or equal to the reference voltage, the second control signal output by the switch control module 11 can be a second-level signal, controlling the second switching device 12 to turn off. The current output from the first current output terminal 210 of the analog-to-digital converter 200 is then delivered to the load 300 after passing through the first voltage divider resistor R1 and the first switching device 21. Further voltage division by the first voltage divider resistor R1 prevents heat from concentrating on the first switching device 21. In this signal, one of the first level signal and the second level signal is a high level signal, and the other is a low level signal.

[0029] Optional, Figure 3 This is a schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 3 The switch control module 11 includes a voltage acquisition unit 111 and a voltage comparison unit 112. The first input terminal of the voltage acquisition unit 11 serves as the second input terminal of the switch control module 11 and is connected to the load 300. The second input terminal of the voltage acquisition unit 111 is connected to the second input terminal of the voltage comparison unit 112, and the output terminal of the voltage acquisition unit 111 is connected to the second input terminal of the voltage comparison unit 112. The voltage acquisition unit 111 is used to acquire the load voltage. The first input terminal of the voltage comparison unit 112 serves as the first input terminal of the switch control module 11 and is connected to the second current output terminal 230 of the analog-to-digital converter 200. The output terminal of the voltage comparison unit 112 serves as the output terminal of the switch control module 11 and is connected to the control terminal of the second switching device 12. The voltage comparison unit 112 is used to generate a second switch control signal based on the load voltage and the reference voltage.

[0030] Specifically, the switch control module 11 may include a voltage acquisition unit 111 and a voltage comparison unit 112. The first input terminal of the voltage acquisition unit 111 is connected to the load 300, and the output terminal of the voltage acquisition unit 111 is connected to the second input terminal of the voltage comparison unit 112. The voltage acquisition unit 111 is mainly used to acquire the load voltage of the load 300 and output the load voltage to the second input terminal of the voltage comparison unit 112. The second input terminal of the voltage comparison unit 112 is connected to the second current output terminal 230 of the analog-to-digital converter 200 to receive the corresponding reference voltage. The main function of the voltage comparison unit 112 is to compare the reference voltage and the load voltage, generate a corresponding second control signal based on the comparison result, and then control the on and off of the second switching device 12. The voltage acquisition unit 111 can be a voltage follower, and the voltage comparison unit 112 can be a voltage comparator.

[0031] Optionally, based on the above embodiments, see also... Figure 3 The switch control module 10 also includes a second resistor R2 and a third resistor R3; the first end of the second resistor R2 is connected to the output end of the voltage acquisition unit 111, and the second end of the second resistor R2 is connected to the second input end of the voltage comparison unit 112; the first end of the third resistor R3 is connected to the second input end of the voltage comparison unit 112, and the second end of the third resistor R3 is grounded.

[0032] Specifically, the switch control module 11 also includes a second resistor R2 and a third resistor R3. The second resistor R2 is connected between the output terminal of the voltage acquisition unit 111 and the second input terminal of the voltage comparison unit 112. One end of the third resistor R3 is connected to the second input terminal of the voltage comparison unit 112, and the second end of the third resistor R3 is grounded. The second resistor R2 and the third resistor R3 mainly function as voltage dividers, dividing the load voltage output by the voltage acquisition unit 111. The resistance values ​​of the second resistor R2 and the third resistor R3 are not specifically limited in this embodiment and can be set according to actual needs. The resistance values ​​of the second resistor R2 and the third resistor R3 are related to the ratio of the output current of the first current output terminal 210 and the output current of the second current output terminal 230 of the analog-to-digital converter 200. The voltage comparison unit 112 is used to generate a corresponding second control signal based on the relationship between the voltage divided by the second resistor R2 and the third resistor R3 and the reference voltage, thereby controlling the on and off of the second switching device 12.

[0033] Optional, Figure 4 This is a schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 4The load branch 20 also includes a fourth resistor R4; the first end of the fourth resistor R4 is connected to the output terminal of the first switching device 21, and the second end of the fourth resistor R4 is connected to the load 300.

[0034] Specifically, the load branch also includes a fourth resistor R4, which is connected in series between the first switching device 21 and the load 300. The fourth resistor R4 is mainly used to divide the voltage in the load branch 20, sharing a certain voltage drop and current, protecting the circuit's safety, and improving the circuit's safety and stability. The resistance value of the fourth resistor R4 is not specifically limited in this embodiment of the invention and can be set according to actual needs. However, to ensure the normal operation of the load 300, the resistance value of the fourth resistor R4 should be less than the resistance value of the first voltage-dividing resistor R1.

[0035] Optionally, based on the above embodiments, see also... Figure 4 The peripheral circuit 100 of the analog-to-digital converter also includes a fifth resistor R5 and a first capacitor C1; the first end of the fifth resistor R5 is connected to the control terminal of the first switching device 21, and the second end of the fifth resistor R5 is connected to the load; the first end of the first capacitor C1 is connected to the control terminal of the first switching device 21, and the second end of the first capacitor C1 is grounded.

[0036] Specifically, the peripheral circuit of the analog-to-digital converter also includes a fifth resistor R5 and a first capacitor C1. The fifth resistor R5 is connected in series between the control terminal of the first switching device 21 and the load 300. The fifth resistor R5 controls the conduction state of the first switching device 21, maintaining its normal bias current and ensuring its stable operating point. One end of the first capacitor C1 is connected to the control terminal of the first switching device 21, and the other end is grounded. The first capacitor C1 and the fifth resistor R5 work together to filter the first control signal output from the control signal terminal of the analog-to-digital converter 200, shaping and filtering the signal, thus improving circuit stability.

[0037] Optional, Figure 5 This is a schematic diagram of the peripheral circuit of another analog-to-digital converter provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 4 and Figure 5 The peripheral circuit 100 of the analog-to-digital converter also includes a sixth resistor R6; the first end of the sixth resistor R6 is connected to the second current output terminal 230 of the analog-to-digital converter 200, and the second end of the sixth resistor R6 is grounded; the first end of the sixth resistor R6 is used to provide a reference voltage to the first input terminal of the switch control module 10.

[0038] Specifically, the peripheral circuit 100 of the analog-to-digital converter (ADC) also includes a sixth resistor R6. The first end of the sixth resistor R6 is connected to the second current output terminal 230 of the ADC 200, and the other end is grounded. The first end of the sixth resistor R6 is also connected to the first input terminal of the voltage divider control circuit 10. The second current output terminal 230 of the ADC 200 is mainly used to output the output current corresponding to the reference voltage. After passing through the sixth resistor R6, the output current of the second current output terminal 230 of the ADC 200 can provide a reference voltage to the first input terminal of the voltage divider control circuit 10. The sixth resistor R6 is mainly used to generate a reference voltage based on the output current of the second current output terminal 230 of the ADC 200. The resistance value of the sixth resistor R6 is not specifically limited in this embodiment of the invention and can be set according to actual needs. For example, the resistance value of the sixth resistor R6 can be the maximum resistance value of the load 300.

[0039] This invention provides an external circuit for an analog-to-digital converter. When the load voltage is less than the reference voltage, the voltage divider control circuit controls the first voltage divider resistor to be connected to the voltage divider branch. The first voltage divider resistor is used to divide the voltage and distribute the heat, avoiding the heat from accumulating on the first switching device on the load branch, thereby improving the overall stability and reliability of the circuit.

[0040] This invention also provides a method for controlling the peripheral circuit of an analog-to-digital converter. Figure 6 This is a flowchart illustrating a control method for the peripheral circuit of an analog-to-digital converter (ADC) according to an embodiment of the present invention. This control method is used to control the peripheral circuit of an ADC provided in any of the above embodiments.

[0041] like Figure 6 As shown, the control method for the peripheral circuit of the analog-to-digital converter provided in this embodiment of the invention includes: S110: Obtain the load voltage and reference voltage.

[0042] Specifically, when the analog-to-digital converter (ADC) outputs current to the load, it is necessary to first obtain the load voltage and the ADC's reference voltage. Then, the conduction state of the ADC's peripheral circuits is controlled according to the relationship between the load voltage and the reference voltage. The load voltage can be obtained through a voltage divider control circuit, and the reference voltage can be obtained from the output current output from the ADC's second current output terminal.

[0043] S120. When the load voltage is less than or equal to the reference voltage, control the first voltage divider resistor to be connected to the load branch.

[0044] Specifically, after obtaining the load voltage and reference voltage, the state of the load branch can be controlled according to the relationship between the load voltage and the reference voltage. If the load voltage is less than or equal to the reference voltage, it indicates that the load is small, and the first switching device may experience excessive voltage drop and temperature rise. In this case, the voltage divider control circuit can control the first voltage divider resistor to be connected to the load branch, using the first voltage divider resistor to share a certain amount of voltage and heat. The reference voltage is not specifically limited in this embodiment of the invention and can be set according to actual needs. For example, the reference voltage can be 50% of the maximum load voltage. When the load voltage is less than or equal to 50% of the maximum load voltage, the voltage divider control circuit controls the first voltage divider resistor to be connected to the load branch, sharing the voltage drop and heat with the first switching device.

[0045] S130. When the load voltage is greater than the reference voltage, control the first voltage divider resistor to short-circuit.

[0046] Specifically, after obtaining the load voltage and the reference voltage, if the load voltage is greater than the reference voltage, it indicates that the load resistance is large, the load requires a large voltage, the load shares most of the voltage, and there is little heat remaining in the load branch. Therefore, there is no need for the first voltage divider resistor to divide the voltage. The first voltage divider resistor is short-circuited by the voltage divider control circuit. The current output by the analog-to-digital converter is delivered to the load through the voltage divider control circuit and the first switching device, and the remaining heat is shared by the first switching device.

[0047] The control method for the peripheral circuit of the analog-to-digital converter provided by this invention controls a first voltage divider resistor to be connected to the load branch through a voltage divider control circuit when the load voltage is less than or equal to the reference voltage, thereby sharing a certain amount of voltage and heat. When the load voltage is greater than the reference voltage, the first voltage divider resistor is short-circuited through the voltage divider control circuit. This effectively avoids heat concentration on the components in the load branch, improving the overall stability and reliability of the circuit operation.

[0048] This invention also provides a signal processing device, which includes the peripheral circuitry of the analog-to-digital converter (ADC) and the ADC itself, as described in the above embodiments. The signal processing device can be an isolator or a safety barrier. Since the signal processing device provided in this invention includes the peripheral circuitry of the ADC, it also has the same beneficial effects, and will not be elaborated further here.

[0049] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A peripheral circuit of an analog-to-digital converter, characterized by, The application relates to an analog-to-digital converter (ADC) and a load branch connected to a first current output terminal of the ADC. The load branch comprises a first voltage-dividing resistor and a first switch device connected in series, and the first switch device is connected to a control signal output terminal of the ADC and is used for being turned on or turned off according to a first control signal of the control signal output terminal. The voltage-dividing control circuit is connected to both ends of the first voltage-dividing resistor and is used for connecting the first voltage-dividing resistor to the load branch or short-circuiting the first voltage-dividing resistor according to a load voltage of a load connected to the load branch. The voltage-dividing control circuit comprises a switch control module and a second switch device.

2. The peripheral circuit of an analog-to-digital converter according to claim 1, characterized in that, A first input terminal of the switch control module is connected to a second current output terminal of the ADC to receive a reference voltage corresponding to an output current of the second current output terminal, and a second input terminal of the switch control module is connected to the load. The switch control module is used for generating a second control signal according to the load voltage and the reference voltage. A control terminal of the second switch device is connected to an output terminal of the switch control module, and the second switch device is connected in parallel to both ends of the first voltage-dividing resistor. The second switch device is used for being turned on or turned off under the control of the second control signal. The switch control module comprises a voltage acquisition unit and a voltage comparison unit.

3. The peripheral circuit of an analog-to-digital converter according to claim 2, characterized in that, A first input terminal of the voltage acquisition unit is connected to the load as the second input terminal of the switch control module, a second input terminal of the voltage acquisition unit is connected to a second input terminal of the voltage comparison unit, and an output terminal of the voltage acquisition unit is connected to the second input terminal of the voltage comparison unit; and the voltage acquisition unit is used for acquiring the load voltage. A first input terminal of the voltage comparison unit is connected to the second current output terminal of the ADC as the first input terminal of the switch control module, and an output terminal of the voltage comparison unit is connected to the control terminal of the second switch device as the output terminal of the switch control module; and the voltage comparison unit is used for generating the second control signal according to the load voltage and the reference voltage. The switch control module further comprises a second resistor and a third resistor.

4. The peripheral circuit of an analog-to-digital converter according to claim 3, characterized in that, A first terminal of the second resistor is connected to the output terminal of the voltage acquisition unit, and a second terminal of the second resistor is connected to the second input terminal of the voltage comparison unit. A first terminal of the third resistor is connected to the second input terminal of the voltage comparison unit, and a second terminal of the third resistor is grounded. The load branch further comprises a fourth resistor.

5. The peripheral circuit of an analog-to-digital converter according to claim 1, characterized in that, A first terminal of the fourth resistor is connected to a second terminal of the first switch device, a first terminal of the first switch device is connected to the first voltage-dividing resistor, and a second terminal of the fourth resistor is connected to the load. The peripheral circuit of the ADC further comprises a fifth resistor and a first capacitor.

6. The peripheral circuit of an analog-to-digital converter according to claim 2, characterized in that, A first terminal of the fifth resistor is connected to the control terminal of the first switch device, and a second terminal of the fifth resistor is connected to the load. A first terminal of the first capacitor is connected to the control terminal of the first switch device, and a second terminal of the first capacitor is grounded. ​ 7. The peripheral circuit of an analog-to-digital converter according to claim 2, characterized in that, The peripheral circuit of the analog-to-digital converter further comprises a sixth resistor; a first end of the sixth resistor is connected with a second current output end of the analog-to-digital converter, and a second end of the sixth resistor is grounded; the first end of the sixth resistor is used for providing the reference voltage to a first input end of the switch control module.

8. The peripheral circuit of an analog-to-digital converter according to claim 5, characterized in that, The first sub-resistor has a resistance value greater than that of the fourth resistor.

9. A control method of a peripheral circuit of an analog-digital converter, characterized by, A control method for the peripheral circuit of the analog-to-digital converter according to any one of claims 1-8, the control method comprising: acquiring the load voltage and the reference voltage; when the load voltage is less than or equal to the reference voltage, controlling the first voltage dividing resistor to be connected to the load branch; when the load voltage is greater than the reference voltage, controlling the first voltage dividing resistor to be short-circuited.

10. A signal processing device, characterized by An analog-to-digital converter and a peripheral circuit of the analog-to-digital converter according to any one of claims 1-8.

Images