Direct-current power supply circuit and needle pressure measurement and control device

Abstract

The utility model discloses a direct-current power supply circuit and a pin pressure measurement and control device, and the direct-current power supply circuit is connected with a power supply and a signal processing circuit, and comprises a first filtering module, a power isolation module, a second filtering module, a voltage stabilization module and a third filtering module which are connected in sequence. The first filtering module is connected with a power supply, and the third filtering module is connected with the signal processing circuit; the first filtering module, the power supply isolation module, the second filtering module, the voltage stabilizing module and the third filtering module are respectively arranged on the same layer of the PCB, the signal processing circuit is arranged on the other layer of the PCB, a hollow part is arranged on the PCB, and the power supply isolation module is attached to the hollow part. The problem that the processing performance of a signal processing circuit is affected due to the fact that a direct-current power supply in the prior art cannot provide power signals with sufficient isolation and low radiation level is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power signal processing, and in particular to a direct current power supply circuit and an acupuncture pressure measurement and control device. Background Art

[0002] In the semiconductor industry, especially when it comes to measuring and controlling the acupressure sensor signals of semiconductor wafers, there are extremely high requirements for the DC power supply of the acupressure sensor and the sensor signal processing circuit. The quality of the DC power supply directly affects the accuracy and stability of the signal processing circuit.

[0003] In the field of micro-signal processing such as sensor signals, the design of traditional DC power supplies usually has problems such as radiation interference, large voltage ripple, and poor stability. It cannot provide power supply signals with sufficient isolation and low radiation levels, thus affecting the processing performance of the signal processing circuit. Utility Model Content

[0004] The main purpose of the present application is to provide a DC power supply circuit and an acupuncture pressure measurement and control device, aiming to solve the problem in the related art that the DC power supply cannot provide a power supply signal with sufficient isolation and low radiation level, thereby affecting the processing performance of the signal processing circuit.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a DC power supply circuit, which is respectively connected to a power supply and a signal processing circuit, and the DC power supply circuit includes a first filter module, a power isolation module, a second filter module, a voltage stabilization module and a third filter module connected in sequence, the first filter module is connected to the power supply, and the third filter module is connected to the signal processing circuit;

[0007] The first filter module, the power isolation module, the second filter module, the voltage stabilizing module and the third filter module are respectively arranged on the same layer of the PCB board, the signal processing circuit is arranged on another layer of the PCB board, a hollow portion is provided on the PCB board, and the power isolation module is mounted on the hollow portion.

[0008] Optionally, the first filtering module is used to filter the power signal provided by the power supply and output a first filtered signal;

[0009] The power isolation module is used to perform electromagnetic isolation on the first filtered signal and output an isolated power signal;

[0010] The second filtering module is used to filter the isolated power supply signal and output a second filtered signal;

[0011] The voltage stabilization module is used to perform voltage stabilization processing on the second filtered signal and output a stabilized power supply signal;

[0012] The third filtering module is used to filter the stabilized power supply signal and output the power supply signal to the signal processing circuit.

[0013] Optionally, the first filtering module includes a first capacitor and a second capacitor, one end of the first capacitor is respectively connected to the power supply and one end of the second capacitor, one end of the second capacitor is connected to the power isolation module, and the other end of the first capacitor and the other end of the second capacitor are grounded.

[0014] Optionally, the second filtering module includes a third capacitor, a fourth capacitor and a fifth capacitor, one end of the third capacitor is respectively connected to the power isolation module and one end of the fourth capacitor, one end of the fourth capacitor is connected to one end of the fifth capacitor, one end of the fifth capacitor is connected to the voltage stabilization module, and the other end of the third capacitor, the other end of the fourth capacitor and the other end of the fifth capacitor are grounded.

[0015] Optionally, the third filtering module includes a sixth capacitor, a seventh capacitor and an eighth capacitor, one end of the sixth capacitor is connected to the voltage stabilizing module and one end of the seventh capacitor respectively, one end of the seventh capacitor is connected to one end of the eighth capacitor, one end of the eighth capacitor is connected to the signal processing circuit, and the other end of the sixth capacitor, the other end of the seventh capacitor and the other end of the eighth capacitor are grounded.

[0016] Optionally, the second filtering module includes a ninth capacitor and a tenth capacitor, one end of the ninth capacitor is respectively connected to the power isolation module and one end of the tenth capacitor, one end of the tenth capacitor is connected to the voltage stabilization module, and the other end of the ninth capacitor and the other end of the tenth capacitor are grounded.

[0017] Optionally, the voltage stabilizing module includes a first voltage stabilizing chip, a filtering unit and a second voltage stabilizing chip connected in sequence, the first voltage stabilizing chip is connected to one end of the tenth capacitor, and the second voltage stabilizing chip is connected to the third filtering module.

[0018] Optionally, the filtering unit includes an eleventh capacitor and a twelfth capacitor, one end of the eleventh capacitor is respectively connected to the first voltage stabilizing chip and one end of the twelfth capacitor, one end of the twelfth capacitor is connected to the second voltage stabilizing chip, and the other end of the eleventh capacitor and the other end of the twelfth capacitor are grounded.

[0019] Optionally, the wiring length between the output pin of the first filter module and the input pin of the power isolation module, the wiring length between the output pin of the power isolation module and the input pin of the second filter module, the wiring length between the output pin of the second filter module and the input pin of the voltage stabilizing module, and the wiring length between the output pin of the voltage stabilizing module and the input pin of the third filter module are all less than two millimeters.

[0020] In a second aspect, the present application provides an acupuncture pressure measurement and control device, the device comprising:

[0021] Multiple DC power supply circuits and multiple signal processing circuits as described above, the multiple DC power supply circuits are connected one-to-one with the multiple signal processing circuits, and any two DC power supply circuits are isolated by intermittent grooves provided on the PCB board;

[0022] The DC power supply circuit supplies power to the signal processing circuit so that the signal processing circuit processes the received acupressure signal.

[0023] The present application filters the power signal output by the power supply through the first filtering module, effectively removes the AC part in the power signal, thereby reducing possible noise and improving the purity of the power signal. The power signal is isolated and output through the power isolation module, reducing the electromagnetic interference of the electromagnetic radiation of the power signal to the subsequent circuit. The isolated power signal is filtered through the second filtering module to provide a pure input signal for the voltage stabilizing module, and then the voltage stabilizing module outputs a regulated power signal with low ripple amplitude and high voltage stability. Finally, the purity of the regulated power signal is further improved through the third filtering module, and a stable power supply signal is provided for the signal processing circuit. At the same time, the present embodiment adopts a physical isolation method in the PCB board, hollows out the power isolation module and its surrounding area, and arranges the DC power circuit and the signal processing circuit on different PCB layers, further reducing electromagnetic radiation and improving the electromagnetic isolation effect. Overall, while ensuring the stable power supply of the DC power circuit, the present application fully considers electromagnetic compatibility, reduces electromagnetic interference between circuits, and thus improves the processing performance and reliability of the signal processing circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of module connection of a DC power supply circuit according to an embodiment of the present application;

[0025] Figure 2 This is a DC power supply circuit diagram of the DC power supply circuit of Embodiment 2 of the present application;

[0026] Figure 3 This is a DC power supply circuit diagram of the DC power supply circuit of Embodiment 3 of the present application;

[0027] Figure 4 This is a schematic diagram of the needle pressure measurement and control device of Example 4 of the present application.

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a device or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a device or system. In the absence of further restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the device or system including the element. In this application, unless otherwise clearly specified and defined, the terms "connection", "fixed" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. In this application, if there is a description involving "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] In the semiconductor industry, especially when it comes to measuring and controlling the acupressure sensor signals of semiconductor wafers, there are extremely high requirements for the DC power supply of the acupressure sensor and the sensor signal processing circuit. The quality of the DC power supply directly affects the accuracy and stability of the signal processing circuit.

[0032] However, in the field of micro-signal processing such as sensor signals, the design of traditional DC power supplies usually has problems such as radiation interference, large voltage ripple, and poor stability. It cannot provide power signals with sufficient isolation and low radiation levels, thus affecting the processing performance of the signal processing circuit.

[0033] In view of the technical problem that the traditional DC power supply cannot provide power signals with sufficient isolation and low radiation level, the present application provides a DC power supply circuit and an acupuncture pressure measurement and control device. The specific embodiments and implementation methods are as follows:

[0034] Embodiment 1

[0035] This embodiment provides a DC power supply circuit. Figure 1 The module connection diagram of the DC power supply circuit of the first embodiment is shown below. Figure 1 A DC power supply circuit provided in this embodiment is described in detail.

[0036] In this embodiment, the DC power supply circuit is connected to the power supply and the signal processing circuit respectively. The DC power supply circuit includes a first filtering module, a power isolation module, a second filtering module, a voltage stabilizing module and a third filtering module connected in sequence. The first filtering module is connected to the power supply, and the third filtering module is connected to the signal processing circuit.

[0037] Among them, the first filter module, the power isolation module, the second filter module, the voltage stabilization module and the third filter module are respectively arranged on the same layer of the PCB board, the signal processing circuit is arranged on another layer of the PCB board, and a hollow portion is provided on the PCB board, and the power isolation module is mounted on the hollow portion.

[0038] The first filtering module is used to filter the power signal provided by the power supply and output a first filtered signal. The power isolation module is used to perform electromagnetic isolation on the first filtered signal and output an isolated power signal. The second filtering module is used to filter the isolated power signal and output a second filtered signal. The voltage stabilizing module is used to stabilize the second filtered signal and output a stabilized power signal. The third filtering module is used to filter the stabilized power signal and output a power supply signal to the signal processing circuit.

[0039] Specifically, in this embodiment, the signal processing circuit is a circuit that can measure and control the needle pressure sensor signal on the semiconductor wafer or detect other tiny signals, and the DC power supply circuit is used to isolate and stabilize the DC signal provided by the power supply to power the signal processing circuit.

[0040] Among them, the power signal provided by the power supply can be a DC signal directly output by the switching power supply. It can be understood that due to the design of the switching power supply itself, the DC signal output by the switching power supply is usually mixed with AC components. The DC signal from the power supply can be filtered by the first filtering module to remove the AC part of the DC signal to reduce the noise that may exist in the DC signal.

[0041] The power isolation module can be an isolated power chip with a built-in high-efficiency DCDC converter and an on-chip transformer. The input first filtered signal can be isolated as an output isolated power signal through the isolated power chip. In the application of switching power supply, the operation of the electronic components in the switching power supply will generate a certain degree of electromagnetic radiation, which may cause electromagnetic interference to the subsequent circuits. The electromagnetic radiation generated by the isolated power chip with a built-in high-efficiency DCDC converter and an on-chip transformer is low enough to fully reduce the electromagnetic interference caused to the subsequent circuits.

[0042] The second filtering module is connected after the power isolation module, and performs further filtering processing on the isolated power signal output by the power isolation module to remove noise in the isolated power signal.

[0043] The voltage stabilizing module can be composed of one or more stages of voltage stabilizing chips, wherein the voltage stabilizing chip can be an LDO (Low Dropout Regulator) chip. The regulated power supply signal output by the LDO chip has a sufficiently low ripple amplitude and a sufficiently high voltage stability. Subsequently, the regulated power supply signal is filtered by the third filtering module to output a power supply signal that meets the power supply requirements of the signal processing circuit.

[0044] The DC power supply circuit and the signal processing circuit are both arranged in the PCB board. In order to further improve the electromagnetic isolation effect of the DC power supply circuit, this embodiment adopts a physical isolation method to hollow out the mounting surface of the isolated power chip and all the stacked layers below and the vicinity of the chip. At the same time, the first filter module, the power isolation module, the second filter module, the voltage stabilizing module and the third filter module are respectively arranged on the same layer of the PCB board, such as the bottom layer of the PCB board, and all components of the signal processing circuit are arranged on another layer of the PCB board, such as the top layer of the PCB board, to further reduce electromagnetic radiation.

[0045] It can be understood that in this embodiment, the power signal output by the power supply is filtered by the first filtering module, and the AC part in the power signal is effectively removed, thereby reducing the possible noise and improving the purity of the power signal. The power signal is isolated and output by the power isolation module, and the electromagnetic interference of the electromagnetic radiation of the power signal to the subsequent circuit is reduced. The isolated power signal is further filtered by the second filtering module to remove the noise and provide a pure input signal for the voltage stabilizing module. Then, the voltage stabilizing module outputs a regulated power signal with low ripple amplitude and high voltage stability. Finally, the purity of the regulated power signal is further improved by the third filtering module, and a stable power supply is provided for the signal processing circuit. At the same time, this embodiment adopts a physical isolation method in the PCB board, hollows out the power isolation module and its surrounding area, and arranges the DC power circuit and the signal processing circuit on different PCB layers, further reducing electromagnetic radiation and improving the electromagnetic isolation effect. Overall, this embodiment fully considers electromagnetic compatibility while ensuring the stable power supply of the DC power circuit, reduces electromagnetic interference between circuits, and improves the processing performance and reliability of the signal processing circuit.

[0046] Embodiment 2

[0047] This embodiment further provides a DC power supply circuit based on the first embodiment. Figure 2 The DC power supply circuit diagram of the second embodiment is shown below. Figure 2 The DC power supply circuit provided in this embodiment is described in detail.

[0048] Reference Figure 2 In this embodiment, the first filtering module of the DC power supply circuit includes a first capacitor and a second capacitor, one end of the first capacitor is respectively connected to the power supply and one end of the second capacitor, one end of the second capacitor is connected to the power isolation module, and the other end of the first capacitor and the other end of the second capacitor are grounded.

[0049] The second filtering module of the DC power supply circuit includes a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5, one end of the third capacitor C3 is respectively connected to the power isolation module and one end of the fourth capacitor C4, one end of the fourth capacitor C4 is connected to one end of the fifth capacitor C5, one end of the fifth capacitor C5 is connected to the voltage stabilizing module, and the other end of the third capacitor C3, the other end of the fourth capacitor C4 and the other end of the fifth capacitor C5 are grounded.

[0050] The third filtering module of the DC power supply circuit includes a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8, one end of the sixth capacitor C6 is connected to the voltage stabilizing module and one end of the seventh capacitor C7 respectively, one end of the seventh capacitor C7 is connected to one end of the eighth capacitor C8, one end of the eighth capacitor C8 is connected to the signal processing circuit, and the other end of the sixth capacitor C6, the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded.

[0051] Specifically, in this embodiment, the external power supply can be a switching power supply that can output a 5V100mA power signal or other power supplies that output a 5V100mA power signal after DCDC conversion. The power signal passes through the first capacitor C1 and the second capacitor C2 of the first filter module in turn, and outputs the first filtered signal to the isolated power chip U1 of the power isolation module. The specification of the first capacitor C1 can be 10uF16V, which is used as an auxiliary filter capacitor, and the specification of the second capacitor C2 can be 0.1uF50V as the main filter capacitor. It can be understood that the capacitance of the second capacitor C2 needs to be compatible with the requirements of the isolated power chip U1 for the input capacitor, otherwise it may cause circuit micro-vibration.

[0052] The isolated power chip U1 isolates the first filtered signal and outputs the isolated power signal to the second filtering module. After the isolated power signal is filtered by the second filtering module including the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5, the second filtered signal is output to the voltage stabilizing module, which includes the LDO chip U2.

[0053] Among them, the voltage of the isolated power signal output by the isolated power chip U1 is 5V+ΔV. Since the LDO chip will step down the input signal, the value of ΔV must be greater than the voltage drop of the LDO chip. In this embodiment, the voltage range of the output isolated power signal is between 5.4V-6.5V. The specification of the third capacitor C3 is 10uF16V, and its capacitance must be equal to or slightly greater than the minimum requirement of the isolated power chip U1 for the output capacitor. The specification of the fourth capacitor C4 is 22uF10V, which plays a role in enhancing filtering. The specification of the fifth capacitor C5 is 1uF50V, and its capacitance must match the requirements of the LDO chip U2 for the input capacitor.

[0054] The LDO chip U2 performs voltage stabilization on the input second filtered signal and outputs the regulated voltage signal to the third filtering module. After the regulated voltage signal is filtered by the third filtering module including the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8, the output power supply signal is used to power the signal processing circuit.

[0055] Among them, the LDO chip outputs a 5V100A regulated signal, the specification of the sixth capacitor C6 is 4.7uF25V, and its capacitance is equal to or slightly greater than the minimum requirement of the LDO chip U2 for the output capacitor, the specification of the seventh capacitor C7 is 22uF10V, and the specification of the eighth capacitor C8 is 100uF10V, both of which play a role in enhancing filtering.

[0056] It is worth mentioning that the wiring length between the output pin of the first filter module and the input pin of the power isolation module, the wiring length between the output pin of the power isolation module and the input pin of the second filter module, the wiring length between the output pin of the second filter module and the input pin of the voltage regulator module, and the wiring length between the output pin of the voltage regulator module and the input pin of the third filter module are all less than two millimeters.

[0057] Specifically, in this embodiment, the mounting surface of the isolated power chip U1 in the PCB board and all the stacked layers below the mounting surface and the vicinity of the chip can be hollowed out. The wiring length between the pin of the second capacitor C2 in the first filter module and the input pin of the isolated power chip U1, the wiring length between the output pin of the isolated power chip U1 and the pin of the third capacitor C3 in the second filter module, the wiring length between the pin of the fifth capacitor C5 of the second filter module and the input pin of the LDO chip U2, and the wiring length between the output pin of the LDO chip U2 and the pin of the sixth capacitor C6 of the third filter module are all less than two millimeters.

[0058] It can be understood that the first filtering module of this embodiment adopts the first capacitor C1 and the second capacitor C2, and the quality of the input signal is guaranteed by preliminary filtering of the power supply. The isolated power supply chip U1 isolates the first filtered signal to ensure that the isolated power supply signal has lower electromagnetic radiation. The second filtering module filters the isolated power supply signal to ensure the purity of the isolated power supply signal. Then, the input signal is stabilized by the voltage stabilizing module and filtered by the third filtering module, and finally a high-quality power supply signal is output to the signal processing circuit. In addition, the reasonable design of the wiring length helps to reduce interference during signal transmission and enhance the anti-interference ability of the circuit. After testing, the voltage ripple peak of the power supply signal finally output in this embodiment is as low as less than 20mV, and the voltage stability can be narrowed to less than 0.5mV.

[0059] Embodiment 3

[0060] This embodiment further provides a DC power supply circuit based on the above embodiment. Figure 3 The DC power supply circuit diagram of the third embodiment is shown below. Figure 3 The DC power supply circuit provided in this embodiment is described in detail.

[0061] Reference Figure 3 In this embodiment, the first filtering module of the DC power supply circuit includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is respectively connected to the power supply and one end of the second capacitor C2, one end of the second capacitor C2 is connected to the power isolation module, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded.

[0062] The second filtering module of the DC power supply circuit includes a ninth capacitor C9 and a tenth capacitor C10, one end of the ninth capacitor C9 is respectively connected to the power isolation module and one end of the tenth capacitor C10, one end of the tenth capacitor C10 is connected to the voltage stabilizing module, and the other end of the ninth capacitor C10 and the other end of the tenth capacitor C10 are grounded.

[0063] The voltage stabilizing module of the DC power supply circuit includes a first voltage stabilizing chip, a filtering unit and a second voltage stabilizing chip connected in sequence, the first voltage stabilizing chip is connected to one end of the tenth capacitor, and the second voltage stabilizing chip is connected to the third filtering module.

[0064] Among them, the filtering unit includes an eleventh capacitor C11 and a twelfth capacitor C12, one end of the eleventh capacitor C11 is respectively connected to the first voltage stabilizing chip and one end of the twelfth capacitor C12, one end of the twelfth capacitor C12 is connected to the second voltage stabilizing chip, and the other end of the eleventh capacitor C11 and the other end of the twelfth capacitor C12 are grounded.

[0065] The third filtering module of the DC power supply circuit includes a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C6, one end of the sixth capacitor C6 is connected to the voltage stabilizing module and one end of the seventh capacitor C7 respectively, one end of the seventh capacitor C7 is connected to one end of the eighth capacitor C8, one end of the eighth capacitor C8 is connected to the signal processing circuit, and the other end of the sixth capacitor C6, the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded.

[0066] Specifically, in this embodiment, the external power supply may be a switching power supply that can output a 24V 500mA power signal or other power supply that outputs a 24V 500mA power signal after DCDC conversion.

[0067] In this embodiment, the specification of the first capacitor C1 can be 2.2uF50V, used as an auxiliary filter capacitor, and the specification of the second capacitor C2 can be 0.1uF50V as a main filter capacitor. It can be understood that the capacitance of the second capacitor C2 needs to be compatible with the requirements of the isolation power chip U3 for the input capacitor, otherwise it may cause circuit micro-vibration.

[0068] In this embodiment, after the isolated power supply signal is filtered by the second filtering module including the ninth capacitor C9 and the tenth capacitor C10 in sequence, the second filtered signal is output to the voltage stabilizing module.

[0069] The voltage stabilizing module adopts a primary LDO chip U4 and a secondary LDO chip U5, and a filter unit respectively connected to the primary LDO chip U4 and the secondary LDO chip U5, wherein the filter unit includes an eleventh capacitor C11 and a twelfth capacitor C12.

[0070] Specifically, in this embodiment, the isolated power chip U3 performs voltage reduction and isolation processing on the 24V 500mA power signal, and the voltage of the output isolated power signal is 9V.

[0071] The specification of the ninth capacitor C9 in the second filter module is 10uF16V, and its capacitance should be equal to or slightly greater than the minimum requirement of the output capacitor of the isolation power chip U3. The specification of the tenth capacitor C10 is 1uF50V, and its capacitance should match the input capacitor requirement of the first-level LDO chip U4 in the voltage regulator module.

[0072] The specification of the eleventh capacitor C11 in the filter unit is 10uF16V, and its capacitance is equal to or slightly greater than the minimum requirement of the first-level LDO chip U4 for the output capacitance. The specification of the twelfth capacitor C12 in the filter unit is 1uF50V, and its capacitance meets the requirement of the second-level LDO power chip U5 for the input capacitance.

[0073] In the third filtering module, the specification of the sixth capacitor C6 is 4.7uF25V, and its capacitance is equal to or slightly greater than the minimum requirement of the secondary LDO chip U5 for the output capacitance. The specification of the seventh capacitor C7 is 22uF10V, and the specification of the eighth capacitor C8 is 100uF10V, both of which play a role in enhancing filtering.

[0074] In this embodiment, after the first-level LDO power chip U4 performs voltage stabilization processing on the isolated power supply signal, it outputs a first-level regulated signal of 7V150mA. After processing the first-level regulated signal, the second-level LDO power chip U6 outputs a second-level regulated signal of 5V150mA. Subsequently, the third filtering module filters the second-level regulated signal and finally outputs a power supply signal of 5V150mA to power the signal processing circuit.

[0075] It can be understood that in this embodiment, the mounting surface of the isolated power chip U3 in the PCB board and all the stacked layers under the mounting surface and the vicinity of the chip can be hollowed out. The wiring length between the pin of the second capacitor C2 in the first filter module and the input pin of the isolated power chip U3, the wiring length between the output pin of the isolated power chip U1 and the pin of the ninth capacitor C9 in the second filter module, the wiring length between the pin of the tenth capacitor C10 of the second filter module and the input pin of the first-level LDO chip U4, the wiring length between the output pin of the first-level LDO chip U4 and the pin of the eleventh capacitor C11, the wiring length between the twelfth capacitor C12 and the input pin of the second-level LDO chip U5, and the wiring length between the output pin of the second-level LDO chip U5 and the pin of the sixth capacitor C6 of the third filter module are all less than two millimeters.

[0076] It can be understood that this embodiment provides a DC power supply circuit when the supply voltage of the external power supply is much larger than the supply voltage required by the signal processing circuit. Through this embodiment, the 24V external power supply voltage can be converted into a power supply signal with low radiation, low ripple amplitude and high stability.

[0077] Embodiment 4

[0078] This embodiment further provides an acupressure measurement and control device based on the above embodiment. Figure 4 , Figure 4 The schematic diagram of the device of the fourth embodiment is shown below. Figure 4 The acupuncture pressure measurement and control device provided in this embodiment is described in detail.

[0079] like Figure 4 In this embodiment, the acupressure measurement and control device includes multiple DC power supply circuits and multiple signal processing circuits. The multiple DC power supply circuits are connected to the multiple signal processing circuits in a one-to-one correspondence, and any two DC power supply circuits are isolated by intermittent grooves provided on the PCB board. The DC power supply circuit supplies power to the signal processing circuit so that the signal processing circuit processes the received acupressure signal.

[0080] In this embodiment, the acupuncture pressure measurement and control device is arranged on a PCB board, and the acupuncture pressure measurement and control device includes 8 acupuncture pressure signal channels, each channel has a DC power supply circuit and a corresponding signal processing circuit, wherein all electronic components of the DC power supply circuit of each channel are distributed on the same layer of the PCB board, that is, the bottom layer of the PCB board, and all components of the signal processing circuit of each channel are distributed on the top layer of the PCB board, and each channel and the DC power supply circuit and signal processing circuit contained therein are physically isolated by boundaries on the PCB board by V-CUT (V-Groove Cutting).

[0081] It is worth mentioning that in the signal processing circuit, the high-frequency modulation of the data input and the demodulation of the data output may also become sources of electromagnetic radiation. For this reason, the modulation module and the demodulation module in the signal processing circuit are also arranged on the PCB board in a hollowed-out manner. Similarly, the crystal oscillator, inductor and other devices in the signal processing circuit are arranged on the PCB board in a hollowed-out manner.

[0082] It can be understood that the acupuncture pressure measurement and control device of this embodiment is arranged on the PCB board by using layering, partitioning, hollowing and other processing methods as much as possible to improve the electromagnetic compatibility between the various circuits on the PCB board.

[0083] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A DC power supply circuit, characterized in that: The DC power supply circuit is connected to the power supply and the signal processing circuit respectively, and the DC power supply circuit includes a first filter module, a power isolation module, a second filter module, a voltage stabilization module and a third filter module connected in sequence, the first filter module is connected to the power supply, and the third filter module is connected to the signal processing circuit; The first filter module, the power isolation module, the second filter module, the voltage stabilizing module and the third filter module are respectively arranged on the same layer of the PCB board, the signal processing circuit is arranged on another layer of the PCB board, a hollow portion is provided on the PCB board, and the power isolation module is mounted on the hollow portion.

2. The DC power supply circuit according to claim 1, characterized in that: The first filtering module is used to filter the power signal provided by the power supply and output a first filtered signal; The power isolation module is used to perform electromagnetic isolation on the first filtered signal and output an isolated power signal; The second filtering module is used to filter the isolated power supply signal and output a second filtered signal; The voltage stabilization module is used to perform voltage stabilization processing on the second filtered signal and output a stabilized power supply signal; The third filtering module is used to filter the stabilized power supply signal and output a power supply signal to the signal processing circuit.

3. The DC power supply circuit according to claim 1, characterized in that: The first filtering module includes a first capacitor and a second capacitor, one end of the first capacitor is respectively connected to the power supply and one end of the second capacitor, one end of the second capacitor is connected to the power isolation module, and the other end of the first capacitor and the other end of the second capacitor are grounded.

4. The DC power supply circuit according to claim 1, characterized in that: The second filtering module includes a third capacitor, a fourth capacitor and a fifth capacitor, one end of the third capacitor is respectively connected to the power isolation module and one end of the fourth capacitor, one end of the fourth capacitor is connected to one end of the fifth capacitor, one end of the fifth capacitor is connected to the voltage stabilization module, and the other end of the third capacitor, the other end of the fourth capacitor and the other end of the fifth capacitor are grounded.

5. The DC power supply circuit according to claim 4, characterized in that: The third filtering module includes a sixth capacitor, a seventh capacitor and an eighth capacitor, one end of the sixth capacitor is connected to the voltage stabilizing module and one end of the seventh capacitor respectively, one end of the seventh capacitor is connected to one end of the eighth capacitor, one end of the eighth capacitor is connected to the signal processing circuit, and the other end of the sixth capacitor, the other end of the seventh capacitor and the other end of the eighth capacitor are grounded.

6. The DC power supply circuit according to claim 1, characterized in that: The second filtering module includes a ninth capacitor and a tenth capacitor, one end of the ninth capacitor is respectively connected to the power isolation module and one end of the tenth capacitor, one end of the tenth capacitor is connected to the voltage stabilizing module, and the other end of the ninth capacitor and the other end of the tenth capacitor are grounded.

7. The DC power supply circuit according to claim 6, characterized in that: The voltage stabilizing module includes a first voltage stabilizing chip, a filtering unit, and a second voltage stabilizing chip which are connected in sequence. The first voltage stabilizing chip is connected to one end of the tenth capacitor, and the second voltage stabilizing chip is connected to the third filtering module.

8. The DC power supply circuit according to claim 7, characterized in that: The filtering unit includes an eleventh capacitor and a twelfth capacitor, one end of the eleventh capacitor is respectively connected to the first voltage stabilizing chip and one end of the twelfth capacitor, one end of the twelfth capacitor is connected to the second voltage stabilizing chip, and the other end of the eleventh capacitor and the other end of the twelfth capacitor are grounded.

9. The DC power supply circuit according to claim 1, characterized in that: The wiring length between the output pin of the first filter module and the input pin of the power isolation module, the wiring length between the output pin of the power isolation module and the input pin of the second filter module, the wiring length between the output pin of the second filter module and the input pin of the voltage stabilizing module, and the wiring length between the output pin of the voltage stabilizing module and the input pin of the third filter module are all less than two millimeters.

10. An acupuncture pressure measurement and control device, characterized in that: The device comprises: A plurality of DC power supply circuits and a plurality of signal processing circuits as claimed in any one of claims 1 to 9, wherein the plurality of DC power supply circuits are connected one-to-one with the plurality of signal processing circuits, and any two of the DC power supply circuits are isolated by intermittent grooves provided on the PCB board; The DC power supply circuit supplies power to the signal processing circuit so that the signal processing circuit processes the received acupressure signal.

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